Patent US3799130A successfully refreshed from Google Patents.
US3799130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
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Filing: 1971-06-21
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Granted: 1974-03-26
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Expires: 1991-06-21
Abstract
Abstract An internal combustion engine including at least one cylinder and piston, a fuel intake system, an exhaust system, and particularly characterized by an exhaust gas recirculation system having a chamber communicating with the base end of the combustion chamber of the cylinder for receiving a charge of exhaust gas at the end of each power stroke and recirculating the exhaust gas charge mixed with fresh air back into the cylinder at the end of each fuel intake stroke of the piston. A valve may be placed in the flow passage communicating the cylinder with the exhaust recirculation chamber for controlling the communication responsive to cam shaft movement or to intake manifold vacuum for correlating the exhaust recirculation with the fuel-air ratio fed to the engine.
Inventors
- 👤 K Dahlstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:20
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/13; F02M26/40; F02M26/36; F02M26/37; F02M26/41
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An internal combustion engine comprising: a cylinder; a piston movable in said cylinder, said piston and said cylinder defining a combustion chamber for combustion of a fuel mixture for driving said piston; a fuel supply system for introducing a fuel-air charge into said combustion chamber; an exhaust system for discharging products of combustion from said combustion chamber; means for recirculating a portion of said products of combustion from said combustion chamber back into said combustion chamber at substantially the end of the fuel intake stroke of said piston; and means for mixing fresh air with said recirculating products of combustion before said products of combustion are recirculated into said combustion chamber.
Claim 2
Dependent Claim
111 words
An internal combustion engine comprising: a cylinder; a piston movable in said cylinder, said piston and said cylinder defining a combustion chamber for combustion of a fuel mixture for driving said piston; a fuel supply system for introducing a fuel-air charge into said combustion chamber; an exhaust system for discharging products of combustion from said combustion chamber; means for recirculating a portion of said products of combustion from said combustion chamber back into said combustion chamber at substantially the end of the fuel intake stroke of said piston; and means for mixing fresh air with said recirculating products of combustion before said products of combustion are recirculated into said combustion chamber.
Claim 3
Dependent Claim
123 words
An internal combustion engine comprising: A cylinder; a piston movable in said cylinder, said piston and said cylinder defining a combustion chamber for combustion of a fuel mixture for driving said piston; a fuel supply system for introducing a fuel-air charge into said combustion chamber; an exhaust system for discharging products of combustion from said combustion chamber; means providing a recirculation chamber and a port communicating said chamber with said combustion chamber when said piston is substantially at the end of each power stroke and when said piston is substantially at the end of each fuel intake stroke; and means for introducing fresh air into said products of combustion in said recirculation chamber before said products are recirculated back to said combustion chamber.
Claim 4
Dependent Claim
123 words
An internal combustion engine comprising: A cylinder; a piston movable in said cylinder, said piston and said cylinder defining a combustion chamber for combustion of a fuel mixture for driving said piston; a fuel supply system for introducing a fuel-air charge into said combustion chamber; an exhaust system for discharging products of combustion from said combustion chamber; means providing a recirculation chamber and a port communicating said chamber with said combustion chamber when said piston is substantially at the end of each power stroke and when said piston is substantially at the end of each fuel intake stroke; and means for introducing fresh air into said products of combustion in said recirculation chamber before said products are recirculated back to said combustion chamber.
Claim 5
Dependent Claim
27 words
An internal combustion engine in accordance with claim 2, wherein said piston is provided with a contoured head surface having a surface portion sloping toward said port.
Claim 6
Dependent Claim
67 words
An internal combustion engine in accordance with claim 2 including valve means associated with said port between said combustion chamber and said recirculation chamber for communicating said chambers at substantially the end of each power stroke of both said piston and at the end of each fuel intake stroke of said piston and for isolating said chambers at all other times during the operation of said engine.
Claim 7
Dependent Claim
296 words
In an internal combustion engine having a cylinder, a piston slidable in said cylinder and defining a combustion chamber therewith, a fuel intake system communicating with said combustion chamber, an exhaust system communicating said combustion chamber, the improvement which comprises: means providing an exhaust recirculation chamber for receiving a portion of the products of combustion exhausted from said combustion chamber and recirculating said portion of said products of combustion back to said combustion chamber; means providing a port communicating said combustion chamber with said exhaust recirculation chamber at a location in said cylinder opening into said combustion chamber at a position at which said port is uncovered by said piston along the terminal portion of each power stroke of said piston for discharging a portion of said products of combustion in said combustion chamber from said combustion chamber into said exhaust recirculation chamber, said port being also uncovered by said piston for communication between said chambers along the terminal portion of each fuel intake stroke of said piston for recirculating said portion of said products of combustion from said exhaust recirculation chamber back into said combustion chamber during said terminal portion of said fuel intake stroke and at the beginning portion of the compression stroke of said piston; air passage means providing communication between said exhaust recirculation chamber and the atmosphere around said engine for introducing fresh air into said exhaust recirculation chamber during the terminal portion of the fuel intake stroke of said piston; and valve means associated with said air passage means for admitting air to said exhaust recIrculation chamber when the pressure in said chamber is below ambient pressure around said chamber and for closing said air passage when the pressure within said exhaust recirculation chamber exceeds the ambient pressure around said chamber.
Claim 8
Dependent Claim
296 words
In an internal combustion engine having a cylinder, a piston slidable in said cylinder and defining a combustion chamber therewith, a fuel intake system communicating with said combustion chamber, an exhaust system communicating said combustion chamber, the improvement which comprises: means providing an exhaust recirculation chamber for receiving a portion of the products of combustion exhausted from said combustion chamber and recirculating said portion of said products of combustion back to said combustion chamber; means providing a port communicating said combustion chamber with said exhaust recirculation chamber at a location in said cylinder opening into said combustion chamber at a position at which said port is uncovered by said piston along the terminal portion of each power stroke of said piston for discharging a portion of said products of combustion in said combustion chamber from said combustion chamber into said exhaust recirculation chamber, said port being also uncovered by said piston for communication between said chambers along the terminal portion of each fuel intake stroke of said piston for recirculating said portion of said products of combustion from said exhaust recirculation chamber back into said combustion chamber during said terminal portion of said fuel intake stroke and at the beginning portion of the compression stroke of said piston; air passage means providing communication between said exhaust recirculation chamber and the atmosphere around said engine for introducing fresh air into said exhaust recirculation chamber during the terminal portion of the fuel intake stroke of said piston; and valve means associated with said air passage means for admitting air to said exhaust recIrculation chamber when the pressure in said chamber is below ambient pressure around said chamber and for closing said air passage when the pressure within said exhaust recirculation chamber exceeds the ambient pressure around said chamber.
Claim 9
Dependent Claim
34 words
An internal combustion engine in accordance with claim 5 wherein said piston has a contoured head end face providing a surface sloping toward said port between said combustion chamber and said exhaust recirculation chamber.
Claim 10
Dependent Claim
39 words
An internal combustion engine in accordance with claim 5 wherein said head end of said piston is shaped to provide swirling action to the products of combustion and air recirculated to said combustion chamber from said exhaust recirculation chamber.
Claim 11
Dependent Claim
34 words
An internal combustion engine in accordance with claim 5 wherein said port opens to said combustion chamber tangentially for optimizing the mixing of said air and products of combustion recirculating to said combustion chamber.
Claim 12
Independent Claim
305 words
A method of operating an internal combustion engine comprising the steps of: introducing a charge of a fuel-air mixture into the combustion chamber of said engine through the fuel intake system of said engine; igniting said mixture in said combustion chamber for driving the piston of said engine through a power stroke; withdrawing a first portion of the products of combustion from said combustion chamber along the end portion of said power stroke of said piston at the piston end of said combustion chamber; mixing air with said first portion of said combustion products withdrawn from said combustion chamber moving said piston through an exhaust stroke for discharging the remaining portion of said products of combustion from said cylinder through an exhaust system of said engine; moving said piston through an intake stroke for drawing another fuel-air charge into said combustion chamber; recirculating the mixture of said air and said first portion of said products for combustion back to said combustion chamber at the piston end thereof along the end portion of said intake stroke of said piston; compressing said fuel-air charge and said mixture of said air and said recirculated products of combustion in said combustion chamber igniting the mixture of said fuel-air charge and said mixture of said air and said recirculated products of combustion in said combustion chamber for driving said piston through a power stroke; and sequentially repeating said steps of an intake, an exhaust, a compression, and a power stroke including the steps of withdrawing said first portion of said products of combustion along said end portion of said power stroke, mixing air with said first portion of said products of combustion, and recirculating said mixture of said air and said first portion of said products of combustion to said combustion chamber along said end portion of said intake stroke.
Claim 13
Independent Claim
305 words
A method of operating an internal combustion engine comprising the steps of: introducing a charge of a fuel-air mixture into the combustion chamber of said engine through the fuel intake system of said engine; igniting said mixture in said combustion chamber for driving the piston of said engine through a power stroke; withdrawing a first portion of the products of combustion from said combustion chamber along the end portion of said power stroke of said piston at the piston end of said combustion chamber; mixing air with said first portion of said combustion products withdrawn from said combustion chamber moving said piston through an exhaust stroke for discharging the remaining portion of said products of combustion from said cylinder through an exhaust system of said engine; moving said piston through an intake stroke for drawing another fuel-air charge into said combustion chamber; recirculating the mixture of said air and said first portion of said products for combustion back to said combustion chamber at the piston end thereof along the end portion of said intake stroke of said piston; compressing said fuel-air charge and said mixture of said air and said recirculated products of combustion in said combustion chamber igniting the mixture of said fuel-air charge and said mixture of said air and said recirculated products of combustion in said combustion chamber for driving said piston through a power stroke; and sequentially repeating said steps of an intake, an exhaust, a compression, and a power stroke including the steps of withdrawing said first portion of said products of combustion along said end portion of said power stroke, mixing air with said first portion of said products of combustion, and recirculating said mixture of said air and said first portion of said products of combustion to said combustion chamber along said end portion of said intake stroke.
References Cited (Backward Citations)
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 |