Device for controlling an internal combustion engine

• US 4,453,516 A
• Filed: 05/22/1981
• Issued: 06/12/1984
• Est. Priority Date: 05/22/1980
• Status: Expired due to Fees

• Current Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Inventors: Filsinger, Reinhard
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Application Number:
  US06/266,136
• Time in Patent Office: 1,117 Days
• Field of Search: 123/352, 123/353, 123/354, 123/340, 123/399, 123/400, 123/478, 123/480, 123/486-488, 123/357, 123/361, 180/178, 180/179
• US Class Current: 477/111
• CPC Class Codes: F02D 11/105 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
• CPC Class Codes: F02D 2009/0261 having a specially shaped transmission member, e.g. a cam, specially toothed gears, with a clutch
• CPC Class Codes: F02D 2011/103 at least one throttle being alternatively mechanically linked to the pedal or moved by an electric actuator

Abstract

A device for controlling the throttle valve of an internal combustion engine accepts input signals representative of vehicle velocity, gearshift position and roadway temperature which by logic means generates a first signal which is employed to modify a second signal received from a desired value generator which is under the control the gas pedal, the signal so modified being employed to control the throttle valve or injection pump position for the internal combustion engine wherein at idling speeds a large change in the accelerator pedal position effects a small change in the throttle valve position which control changes to effect an increasingly degressive transfer characteristic wherein a small change in accelerator pedal position effects a large change in throttle valve position as the vehicle velocity increases to a high velocity.

Claims

1. Device for effecting fuel conservation in an automotive vehicle having an internal combustion engine comprising

a throttle valve,

an accelerator pedal and

means controlling a transfer characteristic between the accelerator pedal and the throttle valve for effecting a progressive transfer characteristic at idling speeds wherein a large change in the accelerator pedal position effects a small change in throttle valve position which control changes to effect an increasingly degressive transfer characteristic wherein a small change in accelerator pedal position effects a large change in throttle valve position as the vehicle velocity increases to high velocity.

2. Device according to claim 1, characterized in that the means controlling the transfer characteristic is responsive to the vehicle velocity.

3. Device according to claim 2, characterized in that the means controlling the transfer characteristic can be changed with a factor associated with at least one additional variable.

4. Device according to claim 3, characterized in that an additional variable is associated with the gearshift position.

6. Device according to one of claims 1-5, characterized in that the function generator is constituted by a leaf spring, one end of which is mounted to be rotatable, and the other end of which is mounted to be rotatable and axially displaceable, wherein at least one end is turned by a regulating element provided with a geared motor in dependence on the regulating variable in such a way that the leaf spring forms, depending on the flexing direction, a curve with a course running from progressive via linear to degressive, along which curve is guided the linkage between the gas pedal and the throttle valve with one of its axles.

7. Device according to one of claims 1-5, characterized in that the function generator consists of an operational amplifier, the noninverting input of which can be fed with an electrical signal associated with the gas pedal position, and from the output of which extend two parallel-connected voltage dividers, with a dividing ratio variable by the regulating value, to the reference potential of the circuit, wherein the tap of the first voltage divider is connected to the inverting input of the operational amplifier and the tap of the second voltage divider is connected to the regulating element of the throttle valve or of the injection pump, respectively.

8. Device according to claim 7, characterized in that both voltage dividers between the amplifier output and tap consist of respectively one ohmic resistor and between tap and reference potential of respectively one photosensitive resistor, on which is effective a lamp common to both, with a luminosity correlated with the regulating variable;

and that a diode current-conductive toward the reference potential is connected in the first voltage divider between the photosensitive resistor and the reference potential.

9. Device according to claim 7, characterized in that there are connected in the first voltage divider, between the amplifier output and the tap, a series circuit of a first photosensitive resistor with a diode current-conductive toward the tap, and a series circuit of a second photosensitive resistor with a diode current-conductive toward the reference potential between the tap and the reference potential;

that respectively one resistor is connected in parallel to both series circuits;

that a first photosensitive resistor is connected in the second voltage divider between the amplifier output and the tap, and a second photosensitive resistor is connected between the tap and the reference potential;

that the luminosity of a first lamp acts on the two first photosensitive resistors of both voltage dividers, and the luminosity of a second lamp acts on the two second photosensitive resistors of both voltage dividers; and

that both lamps are connected on one side with each other and to an adjustable voltage U_M and on the other side with respectively one diode in series connection to the input of the regulating variable, wherein the first diode is current-conductive in the direction from the first lamp to the input of the regulating variable and the second diode is current-conductive from the input of the regulating variable to the second lamp.

5. Device for controlling the throttle valve position or the injection pump position, respectively, of an internal combustion engine, for automotive vehicles with a gas pedal, wherein a function generator is provided which presets the correlation of the throttle valve position or injection pump position with the position of the gas pedal in accordance with a function which can be changed by a regulating and correcting variable,

the regulating variable is associated with the vehicle velocity and

can be changed with a factor associated with at least one further varible and

an additional variable is associated with the gearshift position, and

a further additional variable is associated with the roadway temperature.

10. Control apparatus for one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal, comprising:

means controlling the transfer characteristic between the gas pedal and one of the throttle valve or injection pump for effecting a progressive transfer characteristic at idling speeds wherein a large change in the gas pedal position effects a small change in one of the throttle valve position and injection pump position which changes to effect an increasingly degressive transfer characteristic wherein a small change in gas pedal position effects a large change in throttle valve position as the vehicle velocity increases to a high velocity in accordance with at least a modifying function.

11. Control apparatus according to claim 10, wherein said means controlling the transfer characteristic comprises:

means to modify said transfer function in accordance with vehicle velocity.

12. Control apparatus according to claim 11, wherein said means controlling the transfer characteristic comprises:

means to modify said transfer characteristic in accordance with gearshift position.

13. Apparatus according to one of claims 10 or 11, further comprising:

a leaf spring with a first end rotatable and a second end rotatable and displaceable,

second means to rotate at least one of said ends in response to said modifying function to modify the position of said leaf spring,

third means to control said one of a throttle valve and injection pump in response to the position of said leaf spring.

14. Apparatus according to claim 13, wherein said third means comprises:

fourth means responsive to said gas pedal to modify said correlation in response to the position of said leaf spring.

15. Control apparatus according to claim 10, wherein said means controlling the transfer characteristic comprises:

means to modify said transfer function in accordance with gearshift position.

16. Control apparatus for one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal, comprising:

first function generator means for modifying the correlation between said one of a throttle valve or injection pump position gas pedal position in accordance with at least a modifying function, wherein said first function generator means comprises;

means to modify said correlation in accordance with roadway temperature.

17. Control apparatus for one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal, comprising:

first function generator means for modifying the correlation between said one of a throttle valve or injection pump position and gas pedal position in accordance with at least a modifying function,

wherein said first function generator means comprises;

means to modify said correlation in accordance with vehicle velocity, and

means to modify said correlation in accordance with roadway temperature.

18. Control apparatus for one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal, comprising:

first function generator means for modifying the correlation between said one of a throttle valve or injection pump position and gas pedal position in accordance with at least a modifying function, said first function generator means comprises;

means to modify said correlation in accordance with gearshift position, and

means to modify said correlation in accordance with roadway temperature.

19. Control apparatus for one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal, comprising:

first function generator means for modifying the correlation between said one of a throttle valve or injection pump position and gas pedal position in accordance with at least a modifying function, wherein said first function generator means comprises;

means to modify said correlation in accordance with vehicle velocity,

means to modify said correlation in accordance with gearshift position, and

means to modify said correlation in accordance with roadway temperature.

20. Control apparatus for one of a throttle valve or injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for setting the correlation of said one of said throttle valve and injection pump with the position of the gas pedal,

logic means controlling the transfer characteristic between the gas pedal and one of the throttle valve or injection pump for effecting a progressive transfer characteristic at idling speeds wherein a large change in the gas pedal position effects a small change in one of the throttle valve position or the injection pump position changing to effect an increasingly degressive transfer characteristic wherein a small change in gas pedal position effects a large change in one of the throttle valve position and injection pump position as the vehicle velocity increases to high velocity, in accordance with at least a first function.

21. Control apparatus according to claim 20, wherein said logic means further comprises:

means to modify said output signal in response to vehicle velocity.

22. Control apparatus according to claim 20, wherein said logic means further comprises:

means to modify said output signal in accordance with gearshift position.

23. Control apparatus according to claim 20, wherein said logic means further comprises:

means to modify said output signal in response to vehicle velocity and gearshift position.

24. Control apparatus for one of a throttle valve or injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for setting the correlation of said one of said throttle valve or injection pump with the position of the gas pedal,

logic means for modifying said output signal in accordance with at least a first function, wherein said logic means comprises;

means to modify said output signal in response to roadway temperature.

25. Control apparatus for one of a throttle valve or injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for setting the correlation of said one of said throttle valve or injection pump with the position of the gas pedal,

logic means for modifying said output signal in accordance with at least a first function, wherein said logic means comprises;

means to modify said output signal in response to vehicle velocity and roadway temperature.

26. Control apparatus for one of a throttle valve or injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for setting the correlation of said one of said throttle valve or injection pump with the position of the gas pedal,

logic means for modifying said output signal in accordance with at least a first function, wherein said logic means comprises;

means to modify said output signal in response to gearshift position and roadway temperature.

27. Control apparatus according to claim 26, wherein said logic means comprises:

means to modify said output signal in response to vehicle velocity.

28. A method for controlling one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal comprising the steps of:

generating a first signal in response to a sensed desired value,

generating a second signal in response to a sensed value of vehicle velocity,

generating a third signal in response to a sensed value of a first function,

generating a fourth signal in response to a sensed value of second function,

processing said first, second, third and fourth signals to produce an output signal, and

controlling the transfer characteristic between the gas pedal and one of the throttle valve or injection pump for effecting a progressive transfer characteristic at idling speeds wherein a large change in the gas pedal position effects a small change in one of the throttle valve position or injection pump position, the control changing to effect an increasingly degressive transfer characteristic wherein a small change in gas pedal position effects a large change in one of the throttle valve position or injection pump position as the vehicle velocity increases to high velocity.

29. A method for controlling as set forth in claim 28, wherein said first function is gearshift position.

30. A method for controlling one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal comprising the steps of:

generating a first signal in response to a sensed desired value,

generating a second signal in response to a sensed value of vehicle is velocity,

generating a third signal in response to a sensed value of a first function,

generating a fourth signal in response to a sensed value of second function,

processing said first, second, third and fourth signals to produce an output signal, and

controlling said one of a throttle valve or injection pump in response to said output signal,

wherein said first function is gearshift position and wherein said second function is roadway temperature.

31. Apparatus for controlling one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for generating a first signal in response to a sensed desired value,

means for generating a second signal in response to a sensed value of which is velocity,

means for generating a third signal in response to a sensed value of a first function,

means for generating a fourth signal in response to a sensed value of second function,

microprocessor means for processing said first, second, third and fourth signals to produce an output signal, and

means for controlling the transfer characteristic between the gas pedal and one of the throttle valve or injection pump for effecting a progressive transfer characteristic at idling speeds wherein a large change in the gas pedal position effects a small change in one of the throttle valve position and injection pump position, the control changing to effect an increasingly degressive transfer characteristic wherein a small change in gas pedal position effects a large change in one of the throttle valve position or injection pump position as the vehicle velocity increases to high velocity.

32. Apparatus for controlling as set forth in claim 31, wherein said first function is gearshift position.

33. Apparatus for controlling one of a throttle valve and injection pump of an internal combustion engine for a vehicle having a gas pedal comprising:

means for generating a first signal in response to a sensed desired value,

means for generating a second signal in response to a sensed value of which is velocity,

means for generating a third signal in response to a sensed value of a first function,

means for generating a fourth signal in response to a sensed value of second function,

microprocessor means for processing said first, second, third and fourth signals to produce an output signal, and

means for controlling said one of a throttle valve or injection pump in response to said output signal,

wherein said first function is gearshift position, and

wherein said second function is roadway temperature.

34. A device for effecting fuel conservation in an automotive vehicle having an internal combustion engine with a throttle valve and an accelerator pedal comprising:

at least one lamp,

means for modifying the intensity of light output from the lamp as a function of at least one of vehicle velocity, gearshift position and roadway temperature,

an analog logic operator means responsive to accelerator pedal position,

means sensing the light intensity of said lamp for modifying the output of the analog logic operator means to effect a progressive transfer characteristic at idling speeds wherein a large change in the gas pedal position effects a small change in throttle valve position changing to effect an increasingly degressive transfer characteristic wherein a small change in gas pedal position effects a large change in throttle valve position as the vehicle velocity increases to high velocity.