US3788284A - Feedback modulation of exhaust gases in internal combustion engines - Google Patents

Feedback modulation of exhaust gases in internal combustion engines Download PDF

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Publication number
US3788284A
US3788284A US00255327A US3788284DA US3788284A US 3788284 A US3788284 A US 3788284A US 00255327 A US00255327 A US 00255327A US 3788284D A US3788284D A US 3788284DA US 3788284 A US3788284 A US 3788284A
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exhaust
engine
internal combustion
feedback path
combustion engine
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US00255327A
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C Gardner
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

A system for modulation of the amplitude of engine exhaust feedback to the engine induction system during engine operation. The modulation system includes means for varying the amplitude of exhaust feedback in periodic manner at a frequency which is substantially constant or which may vary as a function of an engine operating parameter. The amplitude may vary as a step function between predetermined levels or continuously and may have a duty cycle (length of time at a predetermined level) which varies as a function of an engine operating parameter, e.g. exhaust manifold temperature. The modulation envelope is controlled by a modulator circuit controlling a valve position in the feedback path. The frequency of modulation is controlled by a divider or multiplier type circuit coupled between a pulse source e.g. the distributor and the modulator circuit.

Claims (18)

1. In an internal combuStion engine having an intake manifold, and a feedback path coupled between said exhaust manifold and said intake manifold for recirculating exhaust gases from said exhaust manifold to said intake manifold; means for modulating the rate of flow of exhaust in said feedback path, said means comprising: timing means including a pulse source for generating first control signals; modulator circuit means including a multivibrator circuit responsive to said first control signals for providing valve control signals, and, valve means disposed in said feedback path and responsive to said valve control signals for modulating the rate of flow of exhaust gases in said feedback path.
2. An internal combustion engine according to claim 1 wherein said first control signals are a function of engine speed.
3. Process for operating an internal combustion engine in a manner to reduce pollutants ejected into the atmosphere which comprises recycling of exhaust gases while modulating the rate of flow of said exhaust gases cyclically during operation of said engine.
4. Process of claim 3 wherein said cyclic variation is over a period of time exceeding about 100 milliseconds.
5. In a motor vehicle powered by an internal combustion engine: first means for reducing emission of pollutants by said engine; second means coupled to said first means for detecting the level of a pollutant in the ambient air surrounding said vehicle and actuating said first means when said level of a pollutant exceeds a predetermined level.
6. The invention according to claim 5 wherein said second means is positioned on said vehicle.
7. The invention according to claim 5 wherein said first means comprises a feedback path including recirculation control valve means.
8. In an internal combustion engine having a feedback path for recirculating engine exhaust; means including electrically controlled valve means disposed in said feedback path and further including a modulator circuit coupled to said electrically controlled valve means for modulating said recirculating engine exhaust between predetermined levels in a cyclical manner.
9. The invention according to claim 8 wherein said predetermined levels are 0 and 100 percent.
10. The invention according to claim 8 wherein said cyclical variation is a function of engine exhaust temperature.
11. The invention according to claim 8 wherein said modulation varies as a function of an engine operating parameter.
12. In combination in a motor vehicle having an internal combustion engine including ignition distributor means, intake manifold, exhaust manifold, and an exhaust passage coupled to said exhaust manifold for exhaust gas flow from said exhaust manifold to the atmosphere, the combination comprising: a divider circuit responsive to pulses flowing in said ignition distributor means; utilization means disposed in said internal combustion engine; and, a modulator circuit responsive to the output of said divider circuit for providing control signals for controlling said utilization means.
13. The combination of claim 12 wherein said modulator circuit comprises a multivibrator circuit.
14. The combination of claim 12 wherein said modulator circuit includes means responsive to an engine operating parameter for varying the characteristics of said control signals.
15. In the method of operating an internal combustion engine, the steps of providing an exhaust flow path for recycling exhaust flow from said engine, and applying periodic modulation to the exhaust flow in said exhaust flow path to control the peak flame temperature.
16. In the method according to claim 15, said step of applying periodic modulation comprising applying said modulation as a function of an engine operating parameter.
17. In the method according to claim 15, the additional step of varying the duty cycle of said periodic modulation.
18. In combination in an internal combustion engine having an intake maNifold, and a feedback path coupled between said exhaust manifold and said intake manifold for recirculating exhaust gases from said exhaust manifold to said intake manifold; electrically controlled valve means disposed in said feedback path for modulating the rate of flow of exhaust gases in said feedback path; a modulator circuit coupled to said electrically controlled valve means; and means coupled to said modulator circuit for causing modulation of said modulator circuit to vary as a function of an engine operating parameter.
US00255327A 1972-05-22 1972-05-22 Feedback modulation of exhaust gases in internal combustion engines Expired - Lifetime US3788284A (en)

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Application Number Priority Date Filing Date Title
US25532772A 1972-05-22 1972-05-22

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US3788284A true US3788284A (en) 1974-01-29
US3788284B1 US3788284B1 (en) 1984-03-20

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872846A (en) * 1972-04-24 1975-03-25 Bendix Corp Exhaust gas recirculation (EGR) internal combustion engine roughness control system
US3975904A (en) * 1975-01-22 1976-08-24 The United States Of America As Represented By The Secretary Of The Army Controlled exhaust gas recirculation
US4026256A (en) * 1976-05-10 1977-05-31 Chrysler Corporation Engine exhaust gas recirculation (EGR) control system
US4190029A (en) * 1977-08-19 1980-02-26 The Bendix Corporation Control of EGR in a closed loop EFI engine
US4280471A (en) * 1979-01-22 1981-07-28 Nissan Motor Company, Limited Control system for internal combustion engine
US4315492A (en) * 1980-06-12 1982-02-16 Gardner Conrad O EGR Valve control signal processing for internal combustion engine
US4677823A (en) * 1985-11-01 1987-07-07 The Garrett Corporation Diesel engine particulate trap regeneration system
US4835963A (en) * 1986-08-28 1989-06-06 Allied-Signal Inc. Diesel engine particulate trap regeneration system
US4914911A (en) * 1989-03-13 1990-04-10 Brunswick Corporation Marine engine exhaust system with diverter valve and alternate exhaust discharge
US5134852A (en) * 1990-08-23 1992-08-04 Tennessee Gas Pipeline Company Clam shell type Y-joint
US5301764A (en) * 1992-04-13 1994-04-12 Gardner Conrad O Hybrid motor vehicle having an electric motor and utilizing an internal combustion engine for fast charge during cruise mode off condition
US5433073A (en) * 1992-03-10 1995-07-18 Institut Francais Du Petrole Exhaust line with catalyst for two-stroke internal-combustion engines
US5946908A (en) * 1996-01-17 1999-09-07 Yamaha Hatsudoki Kabushiki Kaisha Engine control and wall temperature sensor
US20070143007A1 (en) * 2005-12-20 2007-06-21 Caterpillar Inc. Exhaust control system implementing fuel quality detection
US7290627B1 (en) 1992-04-13 2007-11-06 Conrad Oliver Gardner Extended range motor vehicle having ambient pollutant processing
US20090312934A1 (en) * 2006-10-04 2009-12-17 Continental Automotive Gmbh Method for Operating a Combustion Machine, Device for Obtaining Thermal Energy, and Motor Vehicle
US20110314794A1 (en) * 2009-03-05 2011-12-29 Mack Trucks, Inc. Diesel engine system and method and apparatus for handling diesel engine exhaust

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354179A (en) * 1941-03-24 1944-07-25 Blanc Et L Paiche W Charge forming device
US2603197A (en) * 1950-03-10 1952-07-15 Plais R Rowland Gas saving device
US2700967A (en) * 1953-06-02 1955-02-01 Maker Daniel Petrus Fuel system of internal-combustion engines
US2722927A (en) * 1952-10-29 1955-11-08 George W Cornelius Apparatus for controlling internal combustion engine fuel mixtures
US2787989A (en) * 1956-03-19 1957-04-09 Fred E Mckinley Dual solenoid controlled apparatus for preventing release of contaminants from an internal combustion engine
US2977940A (en) * 1956-11-23 1961-04-04 Matthew A Theriault Method of operation of internal combustion engines
US3135253A (en) * 1960-12-24 1964-06-02 Maschf Augsburg Nuernberg Ag Recycled exhaust gas regulation
US3507260A (en) * 1967-05-01 1970-04-21 Brooks Walker Exhaust recirculation control for an engine
US3673993A (en) * 1969-01-20 1972-07-04 Nissan Motor Air-pollution preventive system for motor vehicles
US3677239A (en) * 1970-06-24 1972-07-18 James L Elkins Non-polluting exhaust system for internal combustion engines

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354179A (en) * 1941-03-24 1944-07-25 Blanc Et L Paiche W Charge forming device
US2603197A (en) * 1950-03-10 1952-07-15 Plais R Rowland Gas saving device
US2722927A (en) * 1952-10-29 1955-11-08 George W Cornelius Apparatus for controlling internal combustion engine fuel mixtures
US2700967A (en) * 1953-06-02 1955-02-01 Maker Daniel Petrus Fuel system of internal-combustion engines
US2787989A (en) * 1956-03-19 1957-04-09 Fred E Mckinley Dual solenoid controlled apparatus for preventing release of contaminants from an internal combustion engine
US2977940A (en) * 1956-11-23 1961-04-04 Matthew A Theriault Method of operation of internal combustion engines
US3135253A (en) * 1960-12-24 1964-06-02 Maschf Augsburg Nuernberg Ag Recycled exhaust gas regulation
US3507260A (en) * 1967-05-01 1970-04-21 Brooks Walker Exhaust recirculation control for an engine
US3673993A (en) * 1969-01-20 1972-07-04 Nissan Motor Air-pollution preventive system for motor vehicles
US3677239A (en) * 1970-06-24 1972-07-18 James L Elkins Non-polluting exhaust system for internal combustion engines

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872846A (en) * 1972-04-24 1975-03-25 Bendix Corp Exhaust gas recirculation (EGR) internal combustion engine roughness control system
US3975904A (en) * 1975-01-22 1976-08-24 The United States Of America As Represented By The Secretary Of The Army Controlled exhaust gas recirculation
US4026256A (en) * 1976-05-10 1977-05-31 Chrysler Corporation Engine exhaust gas recirculation (EGR) control system
US4190029A (en) * 1977-08-19 1980-02-26 The Bendix Corporation Control of EGR in a closed loop EFI engine
US4280471A (en) * 1979-01-22 1981-07-28 Nissan Motor Company, Limited Control system for internal combustion engine
US4315492A (en) * 1980-06-12 1982-02-16 Gardner Conrad O EGR Valve control signal processing for internal combustion engine
US4677823A (en) * 1985-11-01 1987-07-07 The Garrett Corporation Diesel engine particulate trap regeneration system
US4835963A (en) * 1986-08-28 1989-06-06 Allied-Signal Inc. Diesel engine particulate trap regeneration system
US4914911A (en) * 1989-03-13 1990-04-10 Brunswick Corporation Marine engine exhaust system with diverter valve and alternate exhaust discharge
US5134852A (en) * 1990-08-23 1992-08-04 Tennessee Gas Pipeline Company Clam shell type Y-joint
US5433073A (en) * 1992-03-10 1995-07-18 Institut Francais Du Petrole Exhaust line with catalyst for two-stroke internal-combustion engines
US5301764A (en) * 1992-04-13 1994-04-12 Gardner Conrad O Hybrid motor vehicle having an electric motor and utilizing an internal combustion engine for fast charge during cruise mode off condition
US5346031A (en) * 1992-04-13 1994-09-13 Gardner Conrad O Hybrid motor vehicle having an electric motor and utilizing an internal combustion engine for fast charge during cruise mode off condition
US7290627B1 (en) 1992-04-13 2007-11-06 Conrad Oliver Gardner Extended range motor vehicle having ambient pollutant processing
US5946908A (en) * 1996-01-17 1999-09-07 Yamaha Hatsudoki Kabushiki Kaisha Engine control and wall temperature sensor
US20070143007A1 (en) * 2005-12-20 2007-06-21 Caterpillar Inc. Exhaust control system implementing fuel quality detection
US7522994B2 (en) 2005-12-20 2009-04-21 Caterpillar Inc. Exhaust control system implementing fuel quality detection
US20090312934A1 (en) * 2006-10-04 2009-12-17 Continental Automotive Gmbh Method for Operating a Combustion Machine, Device for Obtaining Thermal Energy, and Motor Vehicle
US8116960B2 (en) * 2006-10-04 2012-02-14 Continental Automotive Gmbh Method for operating a combustion machine, device for obtaining thermal energy, and motor vehicle
US20110314794A1 (en) * 2009-03-05 2011-12-29 Mack Trucks, Inc. Diesel engine system and method and apparatus for handling diesel engine exhaust
US10145283B2 (en) * 2009-03-05 2018-12-04 Volvo Lastvagnar Ab Diesel engine system and method and apparatus for handling diesel engine exhaust

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RR Request for reexamination filed

Effective date: 19830602

B1 Reexamination certificate first reexamination