US3799301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for engine operation
Assignee: AP Parts Manufacturing Co
•
Filing: 1972-10-04
•
Granted: 1974-03-26
•
Expires: 1992-10-04
Abstract
Abstract The invention is disclosed herein in method and apparatus for normalizing the exhaust system temperature during norml high engine load conditions. In a specific embodiment, the apparatus may divert air from an air injection system to the intake manifold below the carburetor throttle plate under predetermined conditions so that the air-fuel ratio is leaned out. This allows less combustibles to enter the emssion control system and thereby lowers reaction temperatures and improves fuel economy. The method and apparatus for sensing the engine speed or load condition is also novel and includes sensing the pressure of the air supplied by the air pump on an engine to obtain a signal indicating the operating condition of an engine, including engine speed and load. Air under pressure from the air pump is connected to lean out the fuel-air mixture supplied by the carburetor to the engine when an air pump pressure is sensed which provides an indication of a predetermined engine speed and/or load. The sensing of the air pressure may be inhibited in response to a predetermined low throttle setting. The highest engine speed-load signal sensed may be stored and the magnitude of the stored signal reduced in response to application of braking to the vehicle.
Inventors
- 👤 D Bentley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:18
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02D; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0606; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/90
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
16 words
Apparatus as defined in claim 1 which further includes means for storing the highest signal sensed.
Claim 2
Dependent Claim
29 words
Apparatus as defined in claim 2 which further includes means responsive to application of braking to the vehicle carrying the engine for reducing the magnitude of said stored signal.
Claim 3
Dependent Claim
27 words
Apparatus as defined in claim 3 which further includes means for controlling the rate of reduction of the magnitude of said stored signal during application of braking.
Claim 4
Dependent Claim
31 words
Apparatus as defined in claim 1 which further includes means responsive to a predetermined low throttle position for inhibiting sensing of said engine operating condition by said air pressure sensing means.
Claim 5
Dependent Claim
44 words
Apparatus as defined in claim 1 in which said air flow control means includes means responsive to a magnitude of said signal which denotes attainment of a predetermined engine operating condition for enabling flow of air through said connecting means from said air pump.
Claim 6
Dependent Claim
39 words
Apparatus as defined in claim 6 in which said air flow control means further includes means for increasing the flow of air through said connecting means an amount related to an increase in said signal above said predetermined signal.
Claim 7
Dependent Claim
31 words
Apparatus as defined in claim 7 which further includes means responsive to reduction of engine speed to a predetermined low throttle setting for inhibiting operation of said air pressure sensing means.
Claim 8
Dependent Claim
31 words
Apparatus as defined in claim 8 in which said pressure sensing means further includes means for storing and maintaining the highest signal sensed before operation of said low throttle inhibiting means.
Claim 9
Dependent Claim
31 words
Apparatus as defined in claim 9 in which said pressure sensing means further includes means responsive to application of braking to the vehicle for reducing the magnitude of said stored signal.
Claim 10
Dependent Claim
32 words
Apparatus as defined in claim 10 in which said stored signal reducing means includes means for controlling the rate of reduction of the magnitude of said stored signal during application of braking.
Claim 11
Dependent Claim
27 words
Apparatus as defined in claim 1 which further includes means for delaying application of a pressure buildup by said air pump to said air pressure sensing system.
Claim 12
Dependent Claim
38 words
Apparatus as defined in claim 1 which further includes a restricted orifice element connected between said air pressure sensing system and the output of said air pump to reduce the effect of transient changes in air pump output.
Claim 13
Dependent Claim
111 words
Apparatus for controlling exhaust system temperatures of a vehicle internal combustion engine having a carburetor and a throttle valve supplying a fuel and air mixture to an intake manifold, and also having an air pump driven by the engine to supply output air under a pressure which is related to the operating condition of the engine including the speed of and the load on the engine, comprising a. means for sensing the pressure of air supplied by the air pump, b. means for connecting the air pump to the intake manifold of the engine, and c. means responsive to the sensed air pressure for controlling air flow through said connecting means.
Claim 14
Dependent Claim
59 words
Apparatus as defined in claim 14 in which said air pressure sensing means includes a housing having movable means dividing the housing into two chambers, one of said chambers being connected to the output of the air pump so that the position of the dividing means in the housing is responsive to the air pressure supplied by the pump.
Claim 15
Dependent Claim
27 words
Apparatus as defined in claim 15 which further includes actuator linkage means responsive to the position of said dividing means for controlling said air flow controlling means.
Claim 16
Dependent Claim
33 words
Apparatus as defined in claim 15 which further includes means for yieldingly biasing said movable dividing means against movement in response to air pump output pressure until a predetermined output pressure is reached.
Claim 17
Dependent Claim
32 words
Apparatus as defined in claim 17 in which said biasing means yields in response to sensed air pressure an amount related to the increase of sensed pressure above said predetermined output pressure.
Claim 18
Dependent Claim
38 words
Apparatus as defined in claim 14 in which said air pressure sensing means includes canister means connected to be pressurized by output air from the air pump to provide an indication of the operating condition of the engine.
Claim 19
Dependent Claim
35 words
Apparatus as defined in claim 19 in which said air pressure sensing means further includes means connected intermediate the air pump output and said canister means for delaying pressure build up in said canister means.
Claim 20
Dependent Claim
47 words
Apparatus as defined in claim 19 in which said air pressure sensing means further includes an element having a restricted orifice connected intermediate the air pump output and said canister means to reduce the effect on pressurization of said canister means by transient changes in engine speed.
Claim 21
Dependent Claim
34 words
Apparatus as defined in claim 19 in which said air pressure sensing means further includes means for venting said canister means to reduce and prevent pressurization in response to a predetermined low throttle setting.
Claim 22
Dependent Claim
38 words
Apparatus as defined in claim 19 in which said air pressure sensing means further includes means for venting said canister means to reduce and prevent pressurization in response to application of braking to the vehicle carrying the engine.
Claim 23
Dependent Claim
34 words
Apparatus as defined in claim 23 in which said braking responsive venting means includes means for controlling the rate of reduction of pressurization of said canister means in response to braking of the vehicle.
Claim 24
Dependent Claim
64 words
Apparatus as defined in claim 19 in which said canister means is divided by means including check valve means enabling a first portion to receive pressurization from the air pump and a second portion to be pressurized from said first portion via said check valve means to store and retain air under a pressure related to the highest engine speed and load condition sensed.
Claim 25
Dependent Claim
32 words
Apparatus as defined in claim 25 which further includes means connected intermediate the air pump and said first portion of said canister means for delaying pressure build up in said first portion.
Claim 26
Dependent Claim
49 words
Apparatus as defined in claim 25 which further includes an element having a restricted orifice connected intermediate the air pump outlet and said first portion of said canister means to reduce the effect on pressurization of said first portion by transient changes in the operating condition of the engine.
Claim 27
Dependent Claim
36 words
Apparatus as defined in claim 25 which further includes means for venting said first portion of said canister means to reduce and prevent pressurization of said first portion in response to a predetermined low throttle setting.
Claim 28
Dependent Claim
34 words
Apparatus as defined in claim 25 which further includes means for venting said second portion of said canister means to reduce pressurization in response to application of braking to the vehicle carrying the engine.
Claim 29
Dependent Claim
26 words
Apparatus as defined in claim 29 in which said braking responsive venting means further includes restricted orifice means for controlling the rate of reduction of pressurization.
Claim 30
Independent Claim
95 words
A method for controlling operation of a vehicle internal combustion engine comprising the steps of a. sensing the operating condition of an engine including the speed of and the load on said engine and providing a signal related in magnitude thereto, b. inhibiting sensing of engine operating condition in response to a predetermined low throttle setting, c. storing the highest signal sensed before engine operating condition sensing is inhibited, and d. connecting air under pressure to lean out the fuel-air mixture being supplied to the engine in response to a predetermined magnitude of said signal.
Claim 31
Dependent Claim
23 words
A method as defined in claim 31 which further includes reducing the stored signal in response to application of braking to the vehicle.
Claim 32
Independent Claim
107 words
A method for controlling operation of a vehicle internal combustion engine having a carburetor and a throttle valve supplying a fuel-air mixtuRe flow to the engine, and an air pump driven by the engine to supply air under pressure, comprising the steps of a. sensing the pressure of the air supplied by said air pump to obtain a signal indicating the speed of and the load on said engine, and b. connecting air under pressure from said air pump to lean out the fuel-air mixture supplied by the carburetor to the engine when a pump air pressure is sensed which provides a predetermined magnitude of said signal.
Claim 33
Dependent Claim
24 words
A method as defined in claim 33 which further includes inhibiting the sensing of air pressure in response to a predetermined low throttle setting.
Claim 34
Dependent Claim
33 words
A method as defined in claim 33 which further includes a. storing the highest signal sensed, and b. reducing the magnitude of stored signal in response to application of braking to the vehicle.
References Cited (Backward Citations)
US3294074A
Cited
US3364909A
Cited
US3585976A
Cited
US3641767A
Cited
US3744464A
Cited
US3707954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |