US4920932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relating to controlling emissions from two stroke engines
Assignee: Delphi Technologies Inc
•
Filing: 1989-03-21
•
Granted: 1990-05-01
•
Expires: 2009-03-21
Abstract
Abstract Method and apparatus for controlling emissions, particularly of unburnt hydrocarbons, from a two stroke engine. The engine has direct in-cylinder fuel injection and has in the air inlet port and the exhaust port respective devices to control the flow therethrough. The devices are each independently controlled in relation to engine load demand and engine speed to regulate the mass of exhaust gases retained in the combustion chamber. The exhaust flow control device perferably also alters the timing of opening and closing of the exhaust port.
Inventors
- 👤 Christopher K. Schlunke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:49
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02D41/00; F01; F01L; F01L1/00; F01L1/36; F01L1/38; F01L7/00; F01L7/10; F02B; F02B33/00; F02B33/02; F02B33/28; F02B33/30; F02D21/00; F02D21/06; F02D21/08; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3023; F02D41/32; F02D41/34; F02D41/345; F02D43/00; F02D9/00; F02D9/04; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F01L3/00; F01L3/20; F01L3/205; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2275/00; F02B2275/14; F02B61/00; F02B61/04; F02B61/045; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
304 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 2
Independent Claim
304 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 3
Dependent Claim
81 words
A method of operating an engine as claimed in claim 1 wherein the control of the gas flow in the combustion chamber is effected by independently controlling the flow of air into the combustion chamber and the flow of products of combustion from said chamber, one of said flows being controlled in a predetermined relation to the sensed engine speed and the other of said flows being controlled in a predetermined relation to the sensed engine speed and engine load demand.
Claim 4
Dependent Claim
45 words
A method of operating an engine as claimed in claim 2 wherein the controlling of the flow of the products of combustion from said chamber includes adjusting the timing of the opening and closing of the exhaust port in response to the sensed engine speed.
Claim 5
Independent Claim
322 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing independently the engine load demand and the engine speed while the engine is operating, controlling the air flow into the combustion chamber in accordance with the sensed engine load demand, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 6
Independent Claim
322 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing independently the engine load demand and the engine speed while the engine is operating, controlling the air flow into the combustion chamber in accordance with the sensed engine load demand, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 7
Dependent Claim
23 words
A method of operating an internal combustion engine as claimed in claim 4 wherein the engine is mounted for propulsion of a boat.
Claim 8
Dependent Claim
15 words
A method as claimed in claim 5 wherein the engine is an outboard marine engine.
Claim 9
Dependent Claim
24 words
A method of operating an internal combustion engine as claimed in claim 4 wherein the engine is mounted for propulsion of a motor vehicle.
Claim 10
Dependent Claim
45 words
A method of operating an engine as claimed in claim 1 wherein the flow of air into the combustion chamber and the flow of products of combustion from the combustion chamber are controlled to achieve said regulation of the mass of products of combustion retained.
Claim 11
Dependent Claim
31 words
A method of operating an engine as claimed in claim 8, wherein the fuel is injected into the combustion chamber to form a stratified fuel air chamber in the combustion chamber.
Claim 12
Dependent Claim
27 words
A method of operating an engine as claimed in claim 9 wherein the metered quantity of fuel is injected into the combustion chamber entrained in a gas.
Claim 13
Dependent Claim
44 words
A method of operating an engine as claimed in claim 1 wherein the controlling of the flow of gases in the combustion chamber includes adjusting the timing of the opening and closing of the exhaust port in relation to engine speed and load demand.
Claim 14
Dependent Claim
35 words
A method of operating an engine as claimed in claim 1 or 4 or 3 wherein the fuel is injected into the combustion chamber to form a stratified fuel air charge in the combustion chamber.
Claim 15
Dependent Claim
27 words
A method of operating an engine as claimed in claim 12 wherein the metered quantity of fuel is injected into the combustion chamber entrained in a gas.
Claim 16
Dependent Claim
173 words
An internal combustion engine operating on the two stroke cycle comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 17
Dependent Claim
173 words
An internal combustion engine operating on the two stroke cycle comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 18
Dependent Claim
90 words
An internal combustion engine as claimed in claim 14 wherein said means to control the flow of gases include a first means to control the flow of air into said chamber, a second means to control the flow of products of combustion from said chamber, and means operable in response to the engine load demand and engine speed to actuate said first and second means control means in a predetermined relation to regulate the mass of products of combustion retained in the combustion chamber at the closure of the ports.
Claim 19
Dependent Claim
110 words
An internal combustion engine as claimed in claim 14 wherein said means to control the flow of gases includes a first means to control the flow of air into said chamber, a second means to control the flow or products of combustion from said chamber, means operable to actuate one of said first and second control means in a predetermined relation to the engine load demand, and means operable to actuate the other one of said first and second control means in a predetermined relation to engine load demand and engine speed to regulate the mass of products of combustion retained in the combustion chamber at closure of the ports.
Claim 20
Dependent Claim
41 words
An internal combustion engine as claimed in claim 14 wherein the means to control the flow of gases includes means to adjust the timing of the opening and closing of the exhaust port in relation to engine speed and load demand.
Claim 21
Dependent Claim
98 words
An internal combustion engine as claimed in claim 14 including means to sense the engine speed and issue a signal representative of the engine speed, means to sense the engine load demand, an electronic control unit arranged to receive said speed and load demand signals and adapted to determine from said signals the required said gas flow in the combustion chamber and issue a signal representative of said gas flow, and means arranged to receive said gas flow signal and operable in response thereto to control the flow through at least one of the inlet and exhaust ports.
Claim 22
Dependent Claim
27 words
An internal combustion engine as claimed in claim 18 wherein said means operable in response to said gas flow signal controls the flow through the exhaust port.
Claim 23
Dependent Claim
31 words
An internal combustion engine as claimed in claim 14 wherein means are project to inject a metered quantity of fuel into an air charge in the combustion chamber each engine cycle.
Claim 24
Dependent Claim
33 words
An internal combustion engine as claimed in claim 20 wherein said injection means are adapted to inject the fuel in a manner to form a stratified fuel air charge in the combustion chamber.
Claim 25
Dependent Claim
26 words
An internal combustion engine as claimed in claim 21 wherein said injection means are operable to inject said fuel into said chamber entrained is a gas.
Claim 26
Dependent Claim
42 words
An internal combustion engine as claimed in claim 15 or 16 wherein one of said first and second means is operable to adjust the timing of the opening and closing of the exhaust port in relation to engine speed and load demand.
Claim 27
Dependent Claim
35 words
A fuel injected internal combustion engine operating of the two stroke cycle as claimed in any one of claims 15, 16, 17, 18 or 20 wherein the engine is mounted for propulsion of a boat.
Claim 28
Dependent Claim
19 words
A fuel injected internal combustion engine as claimed in claim 24 wherein the engine is an outboard marine engine.
Claim 29
Dependent Claim
30 words
A fuel injected internal combustion engine as claimed in any one of claims 15, 16, 17, 18 or 20 wherein the engine is mounted for propulsion of a motor vehicle.
Claim 30
Dependent Claim
316 words
In an engine propelled boat including a board hull, and a fuel injected internal combustion engine mounted to propel said boat and operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinde, a method of operating said engine in said boat comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 31
Dependent Claim
316 words
In an engine propelled boat including a board hull, and a fuel injected internal combustion engine mounted to propel said boat and operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinde, a method of operating said engine in said boat comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 32
Dependent Claim
18 words
In an engine propelled boat as claimed in claim 27 wherein said engine is an outboard marine engine.
Claim 33
Dependent Claim
299 words
A marine engine operable on the two stroke cycle said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said engine being adapted to operate in accordance with a method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 34
Dependent Claim
299 words
A marine engine operable on the two stroke cycle said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said engine being adapted to operate in accordance with a method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 35
Dependent Claim
13 words
A marine engine as claimed in claim 29 being an outboard marine engine.
Claim 36
Dependent Claim
319 words
In an engine propelled motor vehicle including a vehicle body, wheels supporting the vehicle body on the ground, and a fuel injected internal combustion engine operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, a method of operating said engine in the vehicle comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 37
Dependent Claim
319 words
In an engine propelled motor vehicle including a vehicle body, wheels supporting the vehicle body on the ground, and a fuel injected internal combustion engine operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, a method of operating said engine in the vehicle comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 38
Dependent Claim
310 words
An engine for a motor vehicle, said engine being a fuel injected internal combustion engine operable on the two stroke cycle and comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said engine being adapted to operate in accordance with a method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 39
Dependent Claim
310 words
An engine for a motor vehicle, said engine being a fuel injected internal combustion engine operable on the two stroke cycle and comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said engine being adapted to operate in accordance with a method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of gases through the exhaust port while open in relation to engine speed and load to provide a plurality of predetermined rates of gas flow in the combustion chamber over the full range of engine speeds and loads, said controlling including adjusting the degree of throttling of the exhaust port through a range of values between a minimum and a maximum, said degree of throttling of the exhaust port being preset in relation to engine load and speed.
Claim 40
Dependent Claim
193 words
In an engine propelled boat including a boat hull, and a fuel injected internal combustion engine mounted to propel said boat and operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 41
Dependent Claim
193 words
In an engine propelled boat including a boat hull, and a fuel injected internal combustion engine mounted to propel said boat and operable on the two stroke cycle, said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 42
Dependent Claim
17 words
In an engine propelled boat as claimed in claim 33 said engine being an outboard marine engine.
Claim 43
Dependent Claim
174 words
A fuel injected marine engine operable on the two stroke cycle comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 44
Dependent Claim
174 words
A fuel injected marine engine operable on the two stroke cycle comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 45
Dependent Claim
13 words
A marine engine as claimed in claim 35 being an outboard marine engine.
Claim 46
Dependent Claim
198 words
In an engine propelled motor vehicle including a vehicle body, wheels supporting the vehicle body on the ground, and a fuel injected engine in the body and operable on the two stroke cycle said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 47
Dependent Claim
198 words
In an engine propelled motor vehicle including a vehicle body, wheels supporting the vehicle body on the ground, and a fuel injected engine in the body and operable on the two stroke cycle said engine comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 48
Dependent Claim
184 words
An engine for a motor vehicle, said engine being fuel injected internal combustion engine operable on a two stroke cycle and comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 49
Dependent Claim
184 words
An engine for a motor vehicle, said engine being fuel injected internal combustion engine operable on a two stroke cycle and comprising a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, and means for regulating the mass of the products of combustion retained in the combustion chamber at the closure of the ports by controlling the flow of gases in the combustion chamber in a predetermined relation to the entire operating range of engine load demand and engine speed at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions, while the exhaust port is open so hydrocarbons present in the exhausted products of combustion are in predetermined limits.
Claim 50
Independent Claim
265 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of the gases in the combustion chamber in a predetermined relation over the entire range of engine speed and load conditions at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions.
Claim 51
Independent Claim
265 words
A method of operating an internal combustion engine on the two stroke cycle to control the level of contaminants in the exhaust gases, the engine having a cylinder, a piston mounted to reciprocate in the cylinder, said piston and cylinder defining a combustion chamber that cyclically varies in volume as the piston reciprocates, an air inlet port providing communication between the combustion chamber and a source of air, and an exhaust port providing communication between the combustion chamber and an exhaust duct, said inlet and exhaust ports being arranged to be opened and closed by the piston as it reciprocates in the cylinder, said method comprising admitting a charge of air to the combustion chamber through the inlet port, compressing the charge of air in the combustion chamber by the movement of the piston after the inlet and exhaust ports have been closed, injecting a metered quantity of fuel into the air charge in the combustion chamber, igniting said fuel charge, and exhausting the products of combustion through the exhaust port after expansion in the combustion chamber, sensing the engine load demand and engine speed while the engine is operating, and regulating the mass of the products of combustion retained in the combustion chamber at closure of the ports so hydrocarbons present in the exhausted products of combustion are in predetermined limits by controlling the flow of the gases in the combustion chamber in a predetermined relation over the entire range of engine speed and load conditions at least in part by adjustment of the exhaust port over a range of positions, including intermediate positions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |