GB2068456A - Internal combustion engine throttle valve control linkage - Google Patents

Internal combustion engine throttle valve control linkage Download PDF

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Publication number
GB2068456A
GB2068456A GB8101980A GB8101980A GB2068456A GB 2068456 A GB2068456 A GB 2068456A GB 8101980 A GB8101980 A GB 8101980A GB 8101980 A GB8101980 A GB 8101980A GB 2068456 A GB2068456 A GB 2068456A
Authority
GB
United Kingdom
Prior art keywords
internal combustion
butterfly valve
combustion engine
reference signal
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8101980A
Other versions
GB2068456B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB8101980A priority Critical patent/GB2068456B/en
Publication of GB2068456A publication Critical patent/GB2068456A/en
Application granted granted Critical
Publication of GB2068456B publication Critical patent/GB2068456B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0261—Arrangements; Control features; Details thereof having a specially shaped transmission member, e.g. a cam, specially toothed gears, with a clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
    • F02D2011/103—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being alternatively mechanically linked to the pedal or moved by an electric actuator

Abstract

The maximum opening of the butterfly 17 by the pedal 10 is limited by a follower 19 engaging a cam 20 operated by an electric motor 21, a spring 15 accommodating separation of the links 14, 16 due to greater pedal depression. Springs 9 and 22 provide pedal and butterfly return bias and the cam portions 20a and 20b provide respectively small and large follower displacement for a given motor rotation. A microprocessor circuit 23 receives pedal and butterfly position and engine and vehicle speed signals to provide economy butterfly settings and a desired idling speed. <IMAGE>

Description

SPECIFICATION Internal combustion engine throttle control This invention relates to an internal combustion engine throttle control.
The fuel economy of internal combustion engines can be significantly improved by utilizing modern technology in the precise control of engine fuelling and ignition. Furthermore, advances are now being made in economy by the utilization of mechanical continuously variable transmissions. Generally speaking, however, fuel can still be wasted by the vehicle driver opening the engine throttle wider than is necessary for the existing engine speed, road speed and engine load conditions.
In accordance with the invention there is provided an internal combustion engine throttle control comprising an accelerator pedal, a butterfly valve and linkage means connecting the accelerator pedal to the butterfly valve and including a first movable member coupled to the accelerator pedal, a second movable member coupled to the butterfly valve, first spring means connecting the first movable member to the second movable member whereby depression of the accelerator stresses said first spring means to tend to open the butterfly valve, mechanical limit means restricting relative motion of the ends of said first spring means as said first spring means is relaxed, second spring means acting to urge the butterfly valve towards a closed position, whereby lifting of the drivers foot from the accelerator pedal causes relaxing of said first spring means to the limit permitted by said limit means and movement of the butterfly valve to its closed position by said second spring means, a cam, cam follower means mounted on said second movable member and urged into engagement with said cam by the action of said first spring means so as to limit opening of the butterfly valve in accordance with the position of said cam, a servomotor drivingly connected to said cam, and said cam being shaped to provide a desired non-linear relationship between butterfly valve opening and displacement of the cam by the servo-motor, and control means for the servo-motor operating to displace the cam to a position dependent on at least one vehicle operating parameter.
The control means may include a lowest wins gate which selects the lower of two signals representing respectively an "economical" butterfly valve position and the difference between a maximum engine speed and actual engine speed, the output of the lowest wins gate controlling the servo-motor via a position control loop.
Alternatively the control circuit may include only an engine speed control loop.
An example of the invention is shown in the accompanying drawing in which: Figure 1 is a block diagram of the throttle control, and Figure 2 is a block diagram of an electrical circuit used in the control.
The diagram shows the drivers control as a foot pedal 10 which is connected by a cable 11 to a demand lever 12 to which a demand potentiometer 13 is mechanically connected to provide a transducer sensitive to the driver's control. The lever 12 is also pivotally connected to a link member 14 which carries a tension spring 1 5 coupled at one end to the link member 14 (or to the lever 12) and at the other end to a throttle lever 1 6. The lever 1 6 is pivoted on an axis spaced from and parallel to that of the lever 12 and is mechanically connected to the throttle valve in the engine carburetor 1 7 and also to a throttle potentiometer 1 8. A ball-race 1 9 mounted on the lever 1 6 is urged by the influence of the spring 1 5 into engagement with a cam on the shaft of a motor/gearbox unit 21. The cam may be shaped as shown with a part 20a of nearly constant radius at one end of its arc of travel, the remainder 20b being shaped to give more rapid radial displacement. A light return spring 22 acts on the lever 1 6 to urge it in throttle closing direction.
The potentiometers 13 and 18 provide inputs to a microprocessor-based control circuit 23 which also has inputs from an engine speed transducer 24 and a road wheel speed transducer 25. The control unit 23 consists of a look up table unit 26 a lowest wins circuit 27, phase compensation units 28 and 29, difference amplifiers 30 and 31 and power amplifier 32.
The operation of the control system is as follows. The most economical throttle position is determined from the wheel speed and drivers demand signals in the look up table unit 26.
A maximum engine speed signal is also determined in unit 26. The actual engine speed from transducer 24 is subtracted from the maximum engine speed in difference amplifier 31.
The resulting error signal 34 can be used to control the shifting of a transmission 33. This error signal 34 is processed in the phase compensation network 28 and is then fed to "lowest wins" units 27 together with the most economical throttle angle signal from 26. The one of these two signals that demands the most closed throttle angle is passed on from "wins circuit" 27 to difference amplifier 30. Here the actual position signal from potentiometer 1 8 is subtracted from it.
The error signal is then fed through phase compensation block 29 to power amplifier 32 which in turn drives the motor 21.
The elements 30, 29, 32, 21, and 18 together with the mechanical linkages in Figure 1 constitute a position feedback control system for carburettor butterfly 1 7.
The maximum engine speed is selected for economical operation of the engine/transmission combination and has a suitable idle speed programmed for use when the drivers demand is zero. The engine speed error signal 34 is then processed in phase compensator 28 to give a butterfly angle demand to the position feedback loop that will give the desired idle speed, regardless of changes in engine temperature or auxiliary load. The force applied by the spring 1 5 to the lever 1 6 when the throttle pedal is depressed ensures that the ball race 1 9 follows the cam, the portion 20a ensuring that fine control is obtained when the throttle valve is close to its closed position. When the foot pedal 10 is released the spring-loading 9 of the pedal 10 itself can urge the link 14 into direct contact with the lever 1 6 turning this to close the throttle valve in the event that the motor 21 fails to do this. This ensures fail-safe operation.
In an alternative embodiment, not shown, the potentiometer 1 8 amplifier 30, lowest wins gate 27 and one of the phase compensation circuits 28, 29 is omitted, the power amplifier controlling the motor 21 in accordance with the engine speed error.

Claims (12)

1. An internal combustion engine throttle control comprising an accelerator pedal, a butterfly valve and linkage means connecting the accelerator pedal to the butterfly valve and including a first movable member coupled to the accelerator pedal, a second movable member coupled to the butterfly valve, first spring means connecting the first movable member to the second movable member whereby depression of the accelerator stresses said first spring means to tend to open the butterfly valve, mechanical limit means restricting relative motion of the ends of said first spring means as said first spring means is relaxed, second spring means acting to urge the butterfly valve towards a closed position, whereby lifting of the drivers foot from the accelerator pedal causes relaxing of said first spring means to the limit permitted by said limit means and movement of the butterfly valve to its closed position by said second spring means, a cam, cam follower means mounted on said second movable member and urged into engagement with said cam by the action of said first spring means so as to limit opening of the butterfly valve in accordance with the position of said cam, a servomotor drivingly connected to said cam, and said.
cam being shaped to provide a desired non-linear relationship between butterfly valve opening and displacement of the cam by the servo-motor, and control means for the servo-motor operating to displace the cam to a position dependent on at least one vehicle operating parameter.
2. An internal combustion engine throttle control as claimed in claim 1 further comprising third spring means acting to return the accelerator pedal to a raised rest position and stop means limiting movement of the pedal under the influence of said third spring means.
3. An internal combustion engine throttle control as claimed in claim 1 in which the cam profile is shaped to provide relatively slower motion of the butterfly valve with respect to motion of the servo-motor at small throttle openings than at iarger throttle openings.
4. An internal combustion engine throttle control as claimed in claim 1 in which said control means comprises reference signal generating means, which produces a reference signal dependent on said at least one vehicle operating parameter, butterfly valve position sensing means which produces a feedback signal dependent on the butterfly valve position, error amplifier means receiving said reference signal and said feedback signal and means sensitive to the output of the error amplifier means driving said servo-motor in a manner to cause the feedback signal to approach the reference signal.
5. An internal combustion engine throttle control as claimed in claim 4 in which said means sensitive to the output of the error amplifier means comprises a phase compensation circuit and a power amplifier.
6. An internal combustion engine throttle control as claimed in claim 4 in which said reference signal generating means comprises means for generating a signal representing an "economical" butterfly valve position in accordance with the measured values of vehicle speed and accelerator pedal position.
7. An internal combustion engine throttle control as claimed in claim 4 in which said reference signal generating means comprises means for generating an engine speed reference signal, an engine speed transducer circuit producing an engine speed signal, and a second error amplifier connected to the engine speed reference signal generating means and to said engine speed transducer.
8. An internal combustion engine throttle control as claimed in claim 7 further comprising a phase compensation circuit having its input connected to the output of said second error amplifier.
9. An internal combustion engine throttle control as claimed in claim 7 in which said engine speed reference signal generating means is arranged to generate a signal representing desired engine idling speed.
10. An internal combustion engine as claimed in claim 7 in which said engine speed reference signal generating means. is arranged to generate'a signal representing an upper limit to engine speed.
11. An internal combustion engine throttle control as claimed in claim 7 in which said engine speed reference signal generating means comprises a function generator receiving inputs corresponding to vehicle speed and accelerator pedal position and generates a signal varying as a function of these variables.
12. An internal combustion engine throttle control as claimed in claim 11 in which the reference signal generating means also comprises additional means for generating a signal representing an "economical" butterfly valve position in accordance with the measured values of vehicle speed and accelerator pedal position and a "lowest wins" gate having inputs from said second error amplifier and from said additional means and providing the reference signal as its output.
GB8101980A 1980-01-30 1981-01-22 Internal combustion engine throttle valve control linkage Expired GB2068456B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8101980A GB2068456B (en) 1980-01-30 1981-01-22 Internal combustion engine throttle valve control linkage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8003183 1980-01-30
GB8101980A GB2068456B (en) 1980-01-30 1981-01-22 Internal combustion engine throttle valve control linkage

Publications (2)

Publication Number Publication Date
GB2068456A true GB2068456A (en) 1981-08-12
GB2068456B GB2068456B (en) 1983-09-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8101980A Expired GB2068456B (en) 1980-01-30 1981-01-22 Internal combustion engine throttle valve control linkage

Country Status (1)

Country Link
GB (1) GB2068456B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000534A1 (en) * 1981-08-08 1983-02-17 Brockhaus, Herbert Connecting device between a regulating member for regulating the power of a combustion engine and a control member
EP0089492A1 (en) * 1982-03-24 1983-09-28 Audi Ag Internal-combustion engine
EP0110226A2 (en) * 1982-12-02 1984-06-13 Mikuni Kogyo Kabushiki Kaisha Internal combustion engine control system with means for reshaping of command derived from accelerator control
US4461254A (en) * 1981-08-13 1984-07-24 Vdo Adolf Schindling Ag Device for controlling the position of an element which controls the fuel-air mixture
EP0118175A2 (en) * 1983-01-20 1984-09-12 Stanley Joseph Kasiewicz Road and engine speed governor control circuit
EP0121939A1 (en) * 1983-04-11 1984-10-17 Nissan Motor Co., Ltd. Throttle control system for automotive vehicle
US4531430A (en) * 1982-12-27 1985-07-30 Eaton Corporation Throttle modulator
GB2168427A (en) * 1984-12-13 1986-06-18 Ae Plc Fuel control connecting mechanism with speed-responsive override
US4597049A (en) * 1982-12-28 1986-06-24 Nissan Motor Company, Limited Accelerator control system for automotive vehicle
EP0337099A2 (en) * 1988-04-09 1989-10-18 Robert Bosch Gmbh Control device for an internal combustion engine in vehicles
US4879657A (en) * 1987-03-26 1989-11-07 Nissan Motor Company, Limited System and method for electronically controlling a vehicular engine operation having a safe function
EP0378908A1 (en) * 1988-12-16 1990-07-25 Lucas Industries Public Limited Company Internal combustion engine throttle control
GB2235170A (en) * 1989-08-14 1991-02-27 Autoliv Dev Control arrangement for a motor vehicle
FR2659390A1 (en) * 1990-03-07 1991-09-13 Pierburg Gmbh GAS BUTTERFLY DEVICE FOR INTERNAL COMBUSTION ENGINES.
FR2705735A1 (en) * 1993-05-24 1994-12-02 Rabhi Vianney Device for underfuelling piston-type internal combustion engines
GB2307002A (en) * 1995-11-06 1997-05-14 Ford Motor Co I.c. engine air intake throttle arrangement with motor-driven idle speed controller
EP2174824A3 (en) * 2008-10-08 2011-05-04 Stefan Niemerg Device for non-linear transfer of a setting of a throttle for bicycles and speed restriction device for vehicles, in particular mopeds

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000534A1 (en) * 1981-08-08 1983-02-17 Brockhaus, Herbert Connecting device between a regulating member for regulating the power of a combustion engine and a control member
US4461254A (en) * 1981-08-13 1984-07-24 Vdo Adolf Schindling Ag Device for controlling the position of an element which controls the fuel-air mixture
EP0089492A1 (en) * 1982-03-24 1983-09-28 Audi Ag Internal-combustion engine
EP0110226A2 (en) * 1982-12-02 1984-06-13 Mikuni Kogyo Kabushiki Kaisha Internal combustion engine control system with means for reshaping of command derived from accelerator control
EP0110226A3 (en) * 1982-12-02 1984-11-07 Mikuni Kogyo Kabushiki Kaisha Internal combustion engine control system with means for reshaping of command derived from accelerator control
US4531430A (en) * 1982-12-27 1985-07-30 Eaton Corporation Throttle modulator
US4597049A (en) * 1982-12-28 1986-06-24 Nissan Motor Company, Limited Accelerator control system for automotive vehicle
EP0118175A2 (en) * 1983-01-20 1984-09-12 Stanley Joseph Kasiewicz Road and engine speed governor control circuit
EP0118175A3 (en) * 1983-01-20 1985-06-12 Stanley Joseph Kasiewicz Road and engine speed governor control circuit
US4612615A (en) * 1983-04-11 1986-09-16 Nissan Motor Company, Limited Throttle control system for automotive vehicle
EP0121939A1 (en) * 1983-04-11 1984-10-17 Nissan Motor Co., Ltd. Throttle control system for automotive vehicle
US4712443A (en) * 1984-12-13 1987-12-15 Ae Plc Mechanical over-ride linkages
GB2168427A (en) * 1984-12-13 1986-06-18 Ae Plc Fuel control connecting mechanism with speed-responsive override
US4879657A (en) * 1987-03-26 1989-11-07 Nissan Motor Company, Limited System and method for electronically controlling a vehicular engine operation having a safe function
EP0337099A2 (en) * 1988-04-09 1989-10-18 Robert Bosch Gmbh Control device for an internal combustion engine in vehicles
EP0337099A3 (en) * 1988-04-09 1989-12-27 Robert Bosch Gmbh Control device for an internal combustion engine in vehicles
EP0378908A1 (en) * 1988-12-16 1990-07-25 Lucas Industries Public Limited Company Internal combustion engine throttle control
GB2235170A (en) * 1989-08-14 1991-02-27 Autoliv Dev Control arrangement for a motor vehicle
FR2659390A1 (en) * 1990-03-07 1991-09-13 Pierburg Gmbh GAS BUTTERFLY DEVICE FOR INTERNAL COMBUSTION ENGINES.
FR2705735A1 (en) * 1993-05-24 1994-12-02 Rabhi Vianney Device for underfuelling piston-type internal combustion engines
GB2307002A (en) * 1995-11-06 1997-05-14 Ford Motor Co I.c. engine air intake throttle arrangement with motor-driven idle speed controller
US5651343A (en) * 1995-11-06 1997-07-29 Ford Motor Company Idle speed controller
GB2307002B (en) * 1995-11-06 1999-05-26 Ford Motor Co Idle speed controller
EP2174824A3 (en) * 2008-10-08 2011-05-04 Stefan Niemerg Device for non-linear transfer of a setting of a throttle for bicycles and speed restriction device for vehicles, in particular mopeds

Also Published As

Publication number Publication date
GB2068456B (en) 1983-09-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950122