US3664319A - Internal combustion engine gasoline injection system - Google Patents

Internal combustion engine gasoline injection system Download PDF

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Publication number
US3664319A
US3664319A US6191A US3664319DA US3664319A US 3664319 A US3664319 A US 3664319A US 6191 A US6191 A US 6191A US 3664319D A US3664319D A US 3664319DA US 3664319 A US3664319 A US 3664319A
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Prior art keywords
engine
cam
throttle
air supply
supply passage
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Expired - Lifetime
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US6191A
Inventor
Derek Channing
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ZF International UK Ltd
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Lucas Industries Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2700/00Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/02Controlling by changing the air or fuel supply
    • F02D2700/0217Controlling by changing the air or fuel supply for mixture compressing engines using liquid fuel
    • F02D2700/0261Control of the fuel supply
    • F02D2700/0266Control of the fuel supply for engines with fuel injection

Definitions

  • the invention relates to a gasoline injection system for an internal combustion engine.
  • a control stop for a shuttle-type metering pump is responsive to a cam follower movable by a diaphragm.
  • the diaphragm is in turn responsive to the pressure drop across the engine intake throttle.
  • An airflow control device is carried in the intake, upstream of the throttle.
  • the control device is operable by an element sensitive to engine temperature to reduce the pressure drop and thereby increase fuel supply at low temperatures.
  • a cam track engaged by the cam follower is energizable during engine starting to further increase the fuel supply.
  • This invention relates to an internalcombustion engine petrol injection system and has as an object to provide such a system in a convenient form.
  • a system in accordance with the invention includes a temperature sensing element which is sensitive to the temperature of the engine, an airflow control device actuable by the temperature sensing element to restrict airflow upstream of the throttle of the engine when the engine is cold, means actuable by the temperature sensing element to open the throttle from its normal slow running position when the engine is cold and a fuel control device for controlling the quantity of fuel supplied to the engine, said fuel control device including a control element sensitive to the air pressures on opposite sides of the throttle and arranged to decrease fuel flow as the pressure difference across the throttle increases, said airflow control device serving to reduce the pressure difference when the engine is cold.
  • the fuel control device may include means actuable under the control of the temperature sensing device to increase the fuel flow during starting of the engine.
  • FIGURE is a diagrammatic view, partly in elevation and partly in cross-section.
  • the system illustrated incorporates a metering pump for a gasoline injection system.
  • the pump 10 is of known type having an adjustable stop 11 displaceable by a control device 12.
  • the device 12 includes a body 13, a piston-like member 14 slidable within the body 13, and engaging at its respective ends the stop 11 and a cam follower 15.
  • the cam follower 15 comprises a pair of arms 16 supporting a roller 17 and pivotally mounted on a diaphragm assembly 18.
  • the diaphragm assembly 18 defines within the body 13 a pair of chambers 19, 20, with sealing means 21 being interposed between a part 22 of the diaphragm assembly 18 and an adjacent portion of the body 13.
  • the cam follower roller 17 engages a cam track 23 mounted on a pivot 24 in the body 13.
  • the cam track 23 is rotatable about the pivot 24 by means of a lever 25 actuable by a solenoid 26.
  • the cam track 23 is biased clockwise as seen in the drawing, towards an adjustable limit screw 50 by a spring 27.
  • a terminal 26a of the solenoid 26 is connected to a terminal of a starter solenoid (not shown), for the engine.
  • An engine air intake 28 has adjacent its upstream end 29 an airflow control device in the form of a disc 30 mounted within the bore of the intake 28 upon a pivot 31 which is spaced both from the axis of the bore and the axis of the disc 30.
  • An arm 32 is mounted on the pivot 31 and is coupled thereto by a light torsion spring 33, whereby the disc 30 may be moved independently of the arm 32.
  • a lever 34 is pivotally mounted externally of the intake 28.
  • a bi-metallic coil 35 is arranged to be heated by the exhaust system of the engine and has one end anchored to the intake 28. The other end of the coil 35 engages the lever 34.
  • One end of lever 34 is connected by a link 36 to the arm 32.
  • lever 34 is connected by a link 37 to a cam 38, mounted externally of the intake 28 about a pivot 39.
  • a throttle 40 downstream of the disc30 is rotatable about a pivot 41 by a lever 42.
  • the lever 42 has a pair of adjustable abutments 43, 44 which respectively coact with a stop 45 and with the cam 38. The arrangement is such that, when the engine is cold, the cam 38 operates to open the throttle slightly from its normal slow running position as determined by the stop 45.
  • a microswitch 46 connected in series with the solenoid 26 coacts with the cam 38 so that when the engine is cold, the
  • switch 46 is closed to engage the solenoid 26.
  • a air of passages 47,48 respectively extend between the chambers 19,20 and the bore of the inlet 28 upstream and downstream of the throttle 40.
  • the lever 34 is in the position shown and cam 38 holds switch 46 on.
  • the solenoid 26 is thus energized while the starter is energized, rotating the cam track 23 counter-clockwise about the pivot 24 to allow extra fuel to be supplied to the engine.
  • the throttle 40 is held slightly open by the cam 38.
  • the disc 30 moves under the influence of airflow through the intake 28 to a position dependent on the magnitude of the airflow and on the spring 33.
  • the airflow is restricted by both the disc 30 and throttle 40, instead of by the throttle alone, as is usual.
  • the diaphragm assembly 18 is responsive only to the pressure drop across the throttle 40, instead of the total pressure drop.
  • the cam follower is thus moved to a lesser extent in a direction to reduce the fuel supply to the engine, and overfuelling results.
  • solenoid 26 is not energized, and over fuelling is dependent only on any reduction in thepressure drop across the throttle 40, as described.
  • An internal combustion engine gasoline injection system in which the engine is provided with an air supply passage and a throttle in the air supply passage, the system including a bimetal coil sensitive to the temperature of the engine, a disk constituting an air flow control device, pivot means mounting the disk within the air supply passage adjacent the upstream end of the air supply for pivotal movement about an axis which is spaced from the axis of the disk and the longitudinal axis of the air supply passage, an arm, a torsion spring coupling the arm to the pivoting means whereby the disk may be moved independently of the arm, means attaching one end of the bi-metal coil to the air supply passage, a lever pivotally mounted externally of the air supply passage, the other end of the bi-metal coil engaging the lever, means connecting one end of the lever to the-arm, a cam pivotally mounted externally of the air supply passage, means connecting the other end of the lever to the cam, said throttle being located downstream of the disk, a pivot about which the throttle is rotatable, a second lever for rotating the throttle, an

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The invention relates to a gasoline injection system for an internal combustion engine. A control stop for a shuttle-type metering pump is responsive to a cam follower movable by a diaphragm. The diaphragm is in turn responsive to the pressure drop across the engine intake throttle. An airflow control device is carried in the intake, upstream of the throttle. The control device is operable by an element sensitive to engine temperature to reduce the pressure drop and thereby increase fuel supply at low temperatures. A cam track engaged by the cam follower is energizable during engine starting to further increase the fuel supply.

Description

United States Patent Channing [54] INTERNAL COMBUSTION ENGINE GASOLINE INJECTION SYSTEM [72] Inventor: Derek Channing, Farmington, Mich.
[73] Assignee: Joseph Lucas (Industries) Limited, Birmingham, England [58] FieldofSearch ..l23/1l9, 139.11, 139.11 A, 123/139.17, 139.18, 140.3, 179 A, 179L [561 References Cited UNITED STATES PATENTS 2,965,089 12/1960 Holley, Jr ..123/l79 L 1 May 23, 1972 2,965,092 12/1960 Claire, Jr. ..l23/l39.l 1 A 2,984,232 5/1961 Arndt et al ..l23/140.3
Primary Examiner-Laurence M. Goodridge Attorney-Holman & Stern ABSTRACT The invention relates to a gasoline injection system for an internal combustion engine. A control stop for a shuttle-type metering pump is responsive to a cam follower movable by a diaphragm. The diaphragm is in turn responsive to the pressure drop across the engine intake throttle. An airflow control device is carried in the intake, upstream of the throttle. The control device is operable by an element sensitive to engine temperature to reduce the pressure drop and thereby increase fuel supply at low temperatures. A cam track engaged by the cam follower is energizable during engine starting to further increase the fuel supply.
1 Claim, 1 Drawing Figure PATENTEDMAY23 m2 3,664,319
INVENTOR MZQW AT RNEYS INTERNAL COMBUSTION ENGINE GASOLINE INJECTION SYSTEM BACKGROUND OF THE INVENTION This invention relates to an internalcombustion engine petrol injection system and has as an object to provide such a system in a convenient form.
SUMMARY OF THE INVENTION A system in accordance with the invention includes a temperature sensing element which is sensitive to the temperature of the engine, an airflow control device actuable by the temperature sensing element to restrict airflow upstream of the throttle of the engine when the engine is cold, means actuable by the temperature sensing element to open the throttle from its normal slow running position when the engine is cold and a fuel control device for controlling the quantity of fuel supplied to the engine, said fuel control device including a control element sensitive to the air pressures on opposite sides of the throttle and arranged to decrease fuel flow as the pressure difference across the throttle increases, said airflow control device serving to reduce the pressure difference when the engine is cold.
In addition, the fuel control device may include means actuable under the control of the temperature sensing device to increase the fuel flow during starting of the engine.
BRIEF DESCRIPTION OF THE DRAWINGS An example of the invention is illustrated in the accompanying drawing in which the sole FIGURE is a diagrammatic view, partly in elevation and partly in cross-section.
The system illustrated incorporates a metering pump for a gasoline injection system. The pump 10 is of known type having an adjustable stop 11 displaceable by a control device 12. The device 12 includes a body 13, a piston-like member 14 slidable within the body 13, and engaging at its respective ends the stop 11 and a cam follower 15. The cam follower 15 comprises a pair of arms 16 supporting a roller 17 and pivotally mounted on a diaphragm assembly 18. The diaphragm assembly 18 defines within the body 13 a pair of chambers 19, 20, with sealing means 21 being interposed between a part 22 of the diaphragm assembly 18 and an adjacent portion of the body 13. The cam follower roller 17 engages a cam track 23 mounted on a pivot 24 in the body 13. The cam track 23 is rotatable about the pivot 24 by means of a lever 25 actuable by a solenoid 26. The cam track 23 is biased clockwise as seen in the drawing, towards an adjustable limit screw 50 by a spring 27. A terminal 26a of the solenoid 26 is connected to a terminal of a starter solenoid (not shown), for the engine.
An engine air intake 28 has adjacent its upstream end 29 an airflow control device in the form of a disc 30 mounted within the bore of the intake 28 upon a pivot 31 which is spaced both from the axis of the bore and the axis of the disc 30. An arm 32 is mounted on the pivot 31 and is coupled thereto by a light torsion spring 33, whereby the disc 30 may be moved independently of the arm 32. A lever 34 is pivotally mounted externally of the intake 28. A bi-metallic coil 35 is arranged to be heated by the exhaust system of the engine and has one end anchored to the intake 28. The other end of the coil 35 engages the lever 34. One end of lever 34 is connected by a link 36 to the arm 32.
The other end of lever 34 is connected by a link 37 to a cam 38, mounted externally of the intake 28 about a pivot 39. A throttle 40, downstream of the disc30 is rotatable about a pivot 41 by a lever 42. The lever 42 has a pair of adjustable abutments 43, 44 which respectively coact with a stop 45 and with the cam 38. The arrangement is such that, when the engine is cold, the cam 38 operates to open the throttle slightly from its normal slow running position as determined by the stop 45.
A microswitch 46, connected in series with the solenoid 26 coacts with the cam 38 so that when the engine is cold, the
switch 46 is closed to engage the solenoid 26. A air of passages 47,48 respectively extend between the chambers 19,20 and the bore of the inlet 28 upstream and downstream of the throttle 40. In use, during cold starting, the lever 34 is in the position shown and cam 38 holds switch 46 on. The solenoid 26 is thus energized while the starter is energized, rotating the cam track 23 counter-clockwise about the pivot 24 to allow extra fuel to be supplied to the engine. The throttle 40 is held slightly open by the cam 38. The disc 30 moves under the influence of airflow through the intake 28 to a position dependent on the magnitude of the airflow and on the spring 33. The airflow is restricted by both the disc 30 and throttle 40, instead of by the throttle alone, as is usual. The diaphragm assembly 18 is responsive only to the pressure drop across the throttle 40, instead of the total pressure drop. The cam follower is thus moved to a lesser extent in a direction to reduce the fuel supply to the engine, and overfuelling results.
As the engine becomes warm, the lever 34 is rotated clockwise and the disc 30 has less effect in the airflow. The pressure drop across the throttle thus increases, progressively reducing overfuelling with rise in temperature.
During warm starting, above the temperature at which the switch 46 operates, solenoid 26 is not energized, and over fuelling is dependent only on any reduction in thepressure drop across the throttle 40, as described.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. An internal combustion engine gasoline injection system in which the engine is provided with an air supply passage and a throttle in the air supply passage, the system including a bimetal coil sensitive to the temperature of the engine, a disk constituting an air flow control device, pivot means mounting the disk within the air supply passage adjacent the upstream end of the air supply for pivotal movement about an axis which is spaced from the axis of the disk and the longitudinal axis of the air supply passage, an arm, a torsion spring coupling the arm to the pivoting means whereby the disk may be moved independently of the arm, means attaching one end of the bi-metal coil to the air supply passage, a lever pivotally mounted externally of the air supply passage, the other end of the bi-metal coil engaging the lever, means connecting one end of the lever to the-arm, a cam pivotally mounted externally of the air supply passage, means connecting the other end of the lever to the cam, said throttle being located downstream of the disk, a pivot about which the throttle is rotatable, a second lever for rotating the throttle, an adjustable abutment for each end of the second lever, a stop with which one of the adjustable abutments coacts, the other adjustable abutment coacting with the cam so that when the engine is cold, the cam functions to open the throttle slightly from its normal slow running position as determined by the stop, a fuel control device for controlling the quantity of fuel supplied to the engine, said fuel control device including a body, a diaphragm providing a pair of chambers in the body, passage means providing communication between the air supply passage upstream of the throttle and one of the chambers, second passage means providing communication between the air supply passage downstream of the throttle and the other of the chambers, a cam track pivotally mounted in the body, a cam follower engaging the cam track and being movable relative thereto by the diaphragm, a shuttle-type metering pump, a control stop for the metering pump, means for transmitting the position of the cam follower to the control stop, a solenoid, means operably connecting the solenoid to the cam track to move the cam track about its pivotal mounting, and a microswitch connected in series to the solenoid and cooperable with the cam so that when the engine is cold, the microswitch is closed to engage the solenoid to energize the solenoid to rotate the cam track and allow extra fuel to be supplied to the engine.

Claims (1)

1. An internal combustion engine gasoline injection system in which the engine is provided with an air supply passage and a throttle in the air supply passage, the system including a bimetal coil sensitive to the temperature of the engine, a disk constituting an air flow control device, pivot means mounting the disk within the air supply passage adjacent the upstream end of the air supply for pivotal movement about an axis which is spaced from the axis of the disk and the longitudinal axis of the air supply passage, an arm, a torsion spring coupling the arm to the pivoting means whereby the disk may be moved independently of the arm, means attaching one end of the bi-metal coil to the air supply passage, a lever pivotally mounted externally of the air supply passage, the other end of the bi-metal coil engaging the lever, means connecting one end of the lever to the arm, a cam pivotally mounted externally of the air supply passage, means connecting the other end of the lever to the cam, said throttle being located downstream of the disk, a pivot about which the throttle is rotatable, a second lever for rotating the throttle, an adjustable abutment for each end of the second lever, a stop with which one of the adjustable abutments coacts, the other adjustable abutment coacting with the cam so that when the engine is cold, the cam functions to open the throttle slightly From its normal slow running position as determined by the stop, a fuel control device for controlling the quantity of fuel supplied to the engine, said fuel control device including a body, a diaphragm providing a pair of chambers in the body, passage means providing communication between the air supply passage upstream of the throttle and one of the chambers, second passage means providing communication between the air supply passage downstream of the throttle and the other of the chambers, a cam track pivotally mounted in the body, a cam follower engaging the cam track and being movable relative thereto by the diaphragm, a shuttle-type metering pump, a control stop for the metering pump, means for transmitting the position of the cam follower to the control stop, a solenoid, means operably connecting the solenoid to the cam track to move the cam track about its pivotal mounting, and a microswitch connected in series to the solenoid and cooperable with the cam so that when the engine is cold, the microswitch is closed to engage the solenoid to energize the solenoid to rotate the cam track and allow extra fuel to be supplied to the engine.
US6191A 1970-01-27 1970-01-27 Internal combustion engine gasoline injection system Expired - Lifetime US3664319A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756213A (en) * 1970-08-20 1973-09-04 Honda Motor Co Ltd Internal combustion engine of the fuel injection type
US3884205A (en) * 1972-08-10 1975-05-20 Bosch Gmbh Robert Centrifugal RPM governor for fuel injected internal combustion engines
US4058101A (en) * 1975-07-08 1977-11-15 Nippondenso Co., Ltd. Control apparatus for diesel engine
US4098235A (en) * 1974-08-28 1978-07-04 Repco Research Proprietary Limited Fuel feed control apparatus and system
US4175530A (en) * 1977-01-21 1979-11-27 Diesel Kiki Co., Ltd. Pneumatic governor control apparatus for engine fuel injection system
US4193384A (en) * 1976-05-14 1980-03-18 Robert Bosch Gmbh Fuel injection system
US4222359A (en) * 1977-07-14 1980-09-16 Daimler-Benz Aktiengesellschaft Injection pump, especially for motor vehicles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965089A (en) * 1957-05-27 1960-12-20 Holley Carburetor Co Cold start means for an internal combustion engine
US2965092A (en) * 1957-06-25 1960-12-20 Holley Carburetor Co Fuel metering and pumping system for fuel injection
US2984232A (en) * 1959-03-26 1961-05-16 Borg Warner Fuel injection control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965089A (en) * 1957-05-27 1960-12-20 Holley Carburetor Co Cold start means for an internal combustion engine
US2965092A (en) * 1957-06-25 1960-12-20 Holley Carburetor Co Fuel metering and pumping system for fuel injection
US2984232A (en) * 1959-03-26 1961-05-16 Borg Warner Fuel injection control

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756213A (en) * 1970-08-20 1973-09-04 Honda Motor Co Ltd Internal combustion engine of the fuel injection type
US3884205A (en) * 1972-08-10 1975-05-20 Bosch Gmbh Robert Centrifugal RPM governor for fuel injected internal combustion engines
US4098235A (en) * 1974-08-28 1978-07-04 Repco Research Proprietary Limited Fuel feed control apparatus and system
US4058101A (en) * 1975-07-08 1977-11-15 Nippondenso Co., Ltd. Control apparatus for diesel engine
US4193384A (en) * 1976-05-14 1980-03-18 Robert Bosch Gmbh Fuel injection system
US4175530A (en) * 1977-01-21 1979-11-27 Diesel Kiki Co., Ltd. Pneumatic governor control apparatus for engine fuel injection system
US4222359A (en) * 1977-07-14 1980-09-16 Daimler-Benz Aktiengesellschaft Injection pump, especially for motor vehicles

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