US3612020A - Compensating fuel metering for exhaust gas recirculation - Google Patents

Compensating fuel metering for exhaust gas recirculation Download PDF

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Publication number
US3612020A
US3612020A US39258A US3612020DA US3612020A US 3612020 A US3612020 A US 3612020A US 39258 A US39258 A US 39258A US 3612020D A US3612020D A US 3612020DA US 3612020 A US3612020 A US 3612020A
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United States
Prior art keywords
exhaust gas
passage
engine
gas recirculation
induction
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Expired - Lifetime
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US39258A
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English (en)
Inventor
John W Moulds
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Motors Liquidation Co
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General Motors Corp
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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
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures

Definitions

  • An exhaust gas recirculation control valve is positioned by the throttle to proportion exhaust gas recirculation flow to induction airflow.
  • the exhaust gas recirculation passages are cast integrally in the intake manifold. Fuel metering in a timed fuel injection system responsive to manifold absolute pressure is compensated for exhaust gas recirculation.
  • FIG. 1 is a top plan view of an induction passage throttle body and an exhaust gas recirculationcontrol valve
  • FIG. 2 is a side elevational view of the device shown in FIG. 1 illustrating the configuration of the cam member
  • FIG. 3 is a sectional view taken along line 3-3 of FIG. 1 illustrating the exhaust gas recirculation control valve
  • FIG. 4 is a sectional view along line 44 of FIG. I illustrating the control valve operating mechanism
  • FIG. 5 is a sectional view along line 55 of FIG. 2 illustrating the adjustable connection in the linkage between the exhaust gas recirculation control valve and the throttle;
  • FIG. 6 is a top plan view of the FIG. 1 intake manifold illustrating the exhaust gas crossover passage
  • FIG. 7 is a top plan view of an alternative intake manifold having integrally cast exhaust gas recirculation passages
  • FIG. 8 is a sectional view taken along line 8-8 of FIG. 7 illustrating the openings from the exhaust gas recirculation passage to the induction passages;
  • FIG. 9 is a view similar to FIG. 2 illustrating the fuel-metering-compensating mechanism.
  • FIG. 10 is a circuit diagram for an electronically controlled timed fuel injection system illustrating two embodiments of variable-impedance devices for compensating the fuel metering.
  • a throttle body assembly I0 is mounted on an intake manifold 12.
  • a pair of induction passages 14 pass through assembly 10 and are controlled by a pair of throttles 16 disposed on a throttle shaft 18.
  • a plate 20 and a base 22 Inserted between throttle body assembly 10 and manifold I2 is a plate 20 and a base 22 which have extensions of induction passages 14.
  • Plate 20 and base 22 define an exhaust gas recirculation inlet passage 24 leading to a control valve assembly 26 and an exhaust gas recirculation outlet passage 28 leading from control valve assembly 26.
  • Branches 30 connect exhaust gas recirculation outlet passage 28 with induction pasages 14 below throttles 16.
  • exhaust gas recirculation inlet passage 24 will be referred to merely as exhaust gas recirculation passage 24
  • exhaust gas recirculation outlet passage 28 will be referred to as metered exhaust gas passage 28, and the two passages 24 and 28 will be referred to collectively as exhaust gas recirculation passages.
  • exhaust gas recirculation control valve assembly 26 has an inlet bore 32 leading from exhaust gas recirculation passage 24 to an upper cross passage 34.
  • a butterfly valve 36 is disposed on a shaft 38 in an outlet bore 40 leading from cross passage 34 to metered exhaust gas passage 28.
  • Shaft 38 is joumaled on a pair of bushings 42 (FIG. 4) and has a lever 44 (FIGS. 2 and 4) secured on the outer end thereof.
  • a torsion spring 46 biases shaft 38 and lever 44 in a counterclockwise direction as viewed in FIG. 2.
  • the cover 48 for control valve assembly 26 provides a bracket having an upstanding arm 50 (FIGS. 1 and 4) into which a pair of bolts 52 are threadedly secured. As shown in FIG. 2, bolts 52 extend through a slot 54 in a cam member 56, thereby supporting cam member 56 for linear motion.
  • An additional bolt 58 also extends through slot 54 and is secured to an adjusting nut 60. Adjusting nut 60 threadedly receives a link 62 connected to a throttle lever 64 secured on throttle shaft 18.
  • a spring 66 biases cam member 56 leftwardly as viewed in FIGS. 1 and 2.
  • throttle shaft 18 and throttle lever 64 pulls link 62 and cam member 56 toward the right as viewed in FIG. 2.
  • a cam follower 68 on control valve lever 44 is biased against a cam surface 70 on cam member 56.
  • cam follower 68 successively contacts a firstportion 70a in which control valve 36 remains closed, a first ramp 70b in which control valve 36 opens, a peak 700 in which control valve 36 remains open, a second ramp 70d in which control valve 36 closes, and a second portion 70e in which control valve 36 remains closed.
  • the sequence is reversed as throttles I6 are closed and spring 66 returns cam member 56 toward the left.
  • Cam surface 70 is configured whereby control valve 36 begins opening movement when throttles 16 have been opened about 5", reaches a fully open position when throttles 16 have been opened between 14 and 20, and returns to closed position whenthrottles 16 have been opened about 34.
  • exhaust gas received through exhaust gas recirculation passage 24 is admitted to metered exhaust passage 28 and delivered through branches 30 to induction passages 14.
  • control valve 36 and cam member 56 are biased in a valve-closing direction by springs 46 and 66, they exert no opening force on throttles 16. Moreover, even if control valve 36 or cam member 56 were to remain in an open position, throttles I6 would be free to close because bolt 58 rides toward the left in slot 54 as throttles 16 are closed.
  • Exhaust gas is received by exhaust gas recirculation passage 24 from an exhaust gas riser bore 72 connecting with an exhaust gas crossover passage 74 which passes through intake manifold 12.
  • intake manifold 12 includes a pair of conventional riser passages 76 which communicate with generally horizontal upper and lower plenum chambers 78 and 79 respectively.
  • Plenum chambers 78 and 79 extend longitudinally from the bottom of riser passages 76 to transverse runner passages 80 at the ends thereof.
  • Exhaust crossover passage 74 extends from an inlet 75 at one side of manifold 12, beneath riser passages 76 andplenum chambers 78 and 79, to exhaust gas riser bore 72.
  • induction passages 14, manifold riser passages 76, plenum chambers 78 and 79, and runner passages 80 may be collectively referred to as an induction passage.
  • FIGS. 7 and 8 show a modified intake manifold 12 in which the exhaust gas recirculation and metered exhaust gas passages are cast integrally in the manifold.
  • the FIG. 7 view is schematic and various combinations of dot-dash lines have been used to facilitate visualization of the different passages.
  • a pair of riser passages 76 disposed on opposite sides of the manifold centerline connect with upper and lower plenum chambers 78 and 79, respectively, which are generally horizontal and extend longitudinally through the manifold to transversely reaching runner passages 80.
  • An exhaust gas crossover passage 74' extends from an inlet 75' at one side of the manifold centerline, beneath riser passages 76 and plenum chambers 78 and 79, to the opposite side of the manifold centerline. There exhaust gas crossover passage 74 discharges into an exhaust gas recirculation passage 24'. Passage 24' leads to a pad 82 which is adapted to receive control valve assembly 26. Alternatively, an exhaust gas recirculation control valve of different design could be received in a pocket in manifold 12.
  • a metered exhaust gas passage 28' extends from pad 82, above exhaust gas recirculation passage 24', above exhaust gas crossover passage 74', and under upper plenum chamber 78 to a pair of ports 84 and 86.
  • Port 84 opens vertically into the bottom of upper plenum chamber 78 and is centered below the associated riser assage 76.
  • Port 86 opens horizontally into lower plenum chamber 79.
  • FIG. 9 illustrates a modification of the FIG. 2 device whereby fuel metering may be compensated for exhaust gas recirculation.
  • the FIG. 9 device is identical to that of FIG. 2, supplemented by an additional cam surface 86 on cam member 56. Concurrently with movement of control valve lever 44 by cam surface 70, cam surface 86 operates a lever 88 through a cam follower 90 carried by lever 88. Lever 88 controls a unit 92 to vary an impedance which controls fuel metering as explained below.
  • FIG. is a schematic diagram of an electronically controlled timed fuel injection system.
  • a fuel injector 94 directs fuel into an intake manifold runner passage 80 at the back of an inlet valve 96 for a combustion chamber 98.
  • Injector 94 is operated by a solenoid 100 during each cycle of the engine, and fuel is metered by controlling the duration of time solenoid 100 is energized to operate injector 94.
  • a signal generator 102 which nominally may be considered as a normally open switch, provides a negative voltage pulse during each cycle of the engine. This pulse is differentiated by a capacitor 104 into a negativegoing voltage spike which is delivered to the base 106 of a transistor 108. Transistor 108 thus ceases to conduct, and the voltage at its collector 1 10 increases to render a transistor 112 conductive. The voltage at the collector 114 of transistor 112 then drops and an amplifying transistor 1 16 stops conducting. The voltage at the collector 118 of transistor 116 is thereby increased, and solenoid 100 is energized to operate injector 94.
  • a primary winding 120 As transistor 112 starts conducting, current passes through a primary winding 120.
  • Primary winding 120 is coupled, through a core 122 positioned by a pressure transducer 124, with a secondary winding 126.
  • a voltage is induced in secondary winding 126 which biases base 106 of transistor 108 in a negative direction and holds transistor 108 in a nonconductive state.
  • the rate of change of current in primary winding 120 drops, and the voltage induced in secondary winding 126 reduces sufficiently to render transistor 108 conductive and terminate energization of solenoid 100.
  • unit 92 may control the impedance in the circuit of either primary winding 120 or secondary winding 126.
  • unit 92 could be a potentiometer 920 which, together with resistors 128, 130 and 132, controls the current supplied to primary winding 120.
  • Unit 92 also could be a switch 92b which adds a small resistor 134 to the resistors 136, 138, and 140 controlling the bias voltage on secondary winding 126.
  • pressure transducer 124 is responsive to the absolute pressure in induction passages 14 below throttles 16. It will be appreciated that the induction manifold pressure varies with movement of throttles 16 and with changes in engine load. In addition, as exhaust gas recirculation valve 36 opens and exhaust gas is recirculated to induction passages 14, the absolute pressure in induction passages 14 increases. Manifold absolute pressure transducer 124 then moves core 122 in to increase the inductance between windings 120 and 126 and lengthen the time that solenoid is energized. To compensate for this, the resistance of potentiometer 92a is in creased as control valve 36 opens; this reduces the current flow through primary winding to shorten the time that solenoid 100 is energized. Alternatively, switch 92b closes and small resistor 134 permits an increase in the bias voltage on secondary winding 126; thus a shorter period of time is required to render transistor 108 conductive and terminate energization of solenoid 100.
  • fuel metering which is responsive to induction manifold pressure may be incorrectly proportioned to airflow when exhaust gas is recirculated to the induction passages, and further, that such fuel metering may be compensated for recirculation of exhaust gas by additionally controlling fuel metering in response to the position of the exhaust gas recirculation control valve.
  • a fuel system for delivering fuel to said engine an exhaust gas recirculation passage extending from said exhaust passage to said induction passage for recirculating exhaust gas to said induction passage, and a valve in said exhaust gas recirculation passage controlling exhaust gas flow therethrough
  • said fuel system including means controlling fuel delivery to said engine in accordance with the pressure in said induction passage below said throttle whereby the rate of fuel delivery to said engine tends to increase as the absolute pressure in said induction passage downstream of said throttle increases
  • said fuel system further including means controlling fuel delivery to said engine in accordance with the position of said valve whereby the rate of fuel delivery to said engine tends to decrease as said valve permits increased recirculation of exhaust gas to said induction passage, said fuel system thereby providing an appropriate rate of fuel delivery to said engine as the pressure in said induction passage below said throttle varies with variations both in engine load and in the position of said throttle

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
US39258A 1970-05-21 1970-05-21 Compensating fuel metering for exhaust gas recirculation Expired - Lifetime US3612020A (en)

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US3925870A 1970-05-21 1970-05-21

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US (1) US3612020A (enrdf_load_stackoverflow)
JP (1) JPS50214B1 (enrdf_load_stackoverflow)
CA (1) CA925388A (enrdf_load_stackoverflow)
FR (1) FR2091753A5 (enrdf_load_stackoverflow)
GB (1) GB1279079A (enrdf_load_stackoverflow)
SE (1) SE369758B (enrdf_load_stackoverflow)
ZA (1) ZA711919B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941105A (en) * 1973-11-08 1976-03-02 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for three-valve engine
US4011845A (en) * 1972-06-02 1977-03-15 Texaco Inc. Internal combustion engine operation utilizing exhaust gas recirculation
US4020808A (en) * 1973-02-23 1977-05-03 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for emissions control
US4132203A (en) * 1977-03-17 1979-01-02 The Bendix Corporation Single point intermittent flow fuel injection
US4372271A (en) * 1977-03-17 1983-02-08 The Bendix Corporation Single point intermittent flow fuel injection
US5448974A (en) * 1993-02-25 1995-09-12 Yamaha Hatsudoki Kabushiki Kaisha Engine output control

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE405273B (sv) * 1973-05-02 1978-11-27 Bosch Gmbh Robert Brensleinsprutningsanordning for forbrenningsmotorer med egen tendning
WO1997020133A1 (en) * 1995-11-29 1997-06-05 Ford Motor Company Limited Stratified charged engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203410A (en) * 1963-10-04 1965-08-31 Bosch Gmbh Robert Electrically controlled fuel injection system
US3444846A (en) * 1967-04-24 1969-05-20 Chrysler Corp Engine exhaust recirculation
US3457906A (en) * 1967-08-07 1969-07-29 Atlantic Richfield Co Control mechanism for exhaust recycle system
US3464396A (en) * 1966-08-31 1969-09-02 Bosch Gmbh Robert Impulse generator
US3465736A (en) * 1967-10-09 1969-09-09 Atlantic Richfield Co Exhaust recycle control mechanism
US3470857A (en) * 1968-09-05 1969-10-07 Gen Motors Corp Internal combustion engine construction and method for improved operation with exhaust gas recirculation
US3498274A (en) * 1968-04-29 1970-03-03 Garrett Corp Fuel injector for internal combustion engines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203410A (en) * 1963-10-04 1965-08-31 Bosch Gmbh Robert Electrically controlled fuel injection system
US3464396A (en) * 1966-08-31 1969-09-02 Bosch Gmbh Robert Impulse generator
US3444846A (en) * 1967-04-24 1969-05-20 Chrysler Corp Engine exhaust recirculation
US3457906A (en) * 1967-08-07 1969-07-29 Atlantic Richfield Co Control mechanism for exhaust recycle system
US3465736A (en) * 1967-10-09 1969-09-09 Atlantic Richfield Co Exhaust recycle control mechanism
US3498274A (en) * 1968-04-29 1970-03-03 Garrett Corp Fuel injector for internal combustion engines
US3470857A (en) * 1968-09-05 1969-10-07 Gen Motors Corp Internal combustion engine construction and method for improved operation with exhaust gas recirculation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011845A (en) * 1972-06-02 1977-03-15 Texaco Inc. Internal combustion engine operation utilizing exhaust gas recirculation
US4020808A (en) * 1973-02-23 1977-05-03 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for emissions control
US3941105A (en) * 1973-11-08 1976-03-02 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for three-valve engine
US4132203A (en) * 1977-03-17 1979-01-02 The Bendix Corporation Single point intermittent flow fuel injection
US4372271A (en) * 1977-03-17 1983-02-08 The Bendix Corporation Single point intermittent flow fuel injection
US5448974A (en) * 1993-02-25 1995-09-12 Yamaha Hatsudoki Kabushiki Kaisha Engine output control

Also Published As

Publication number Publication date
GB1279079A (en) 1972-06-21
DE2116606A1 (de) 1971-12-02
SE369758B (enrdf_load_stackoverflow) 1974-09-16
JPS50214B1 (enrdf_load_stackoverflow) 1975-01-07
FR2091753A5 (enrdf_load_stackoverflow) 1972-01-14
ZA711919B (en) 1971-12-29
CA925388A (en) 1973-05-01

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