Abstract: A main switch of a cruise control system is combined with one of a number of the control switches such as a set/coast switch, wherein when the combined switch is once turned ON, the combined switch functions as a main switch, and when the combined switch is twice turned ON, the main function of the combined switch is operated. On the other hand, when the combined switch is once turned ON and this state is continued for more than a predetermined time, the combined switch functions as a main switch at first, and after the predetermined time has passed, the main function of the combined switch is operated.

Abstract: A system and method for controlling an engine, in which a value correlative to an engine output is detected, a target value of the engine output correlative value (preferably a pseudo value corresponding to an indicated mean effective pressure) is calculated on the basis of an angular displacement of an accelerator pedal and engine speed, the detected value correlative to the engine output is compared with the target value, an opening angle of a throttle valve located within a throttle chamber of the engine for adjusting an intake air quantity supplied to the engine according to its opening angle is calculated on the basis of the comparison result, and the throttle valve is actuated to adjust the intake air quantity according to the calculated opening angle so that the detected value correlative to the engine output coincides with the target value.

Abstract: A system and method for controlling a vehicle speed in which an opening angle of a throttle valve located within an intake air passage of an engine of the vehicle is adjusted to a first target opening angle set so as to correspond to a desired cruising vehicle speed in addition to the adjustment of the opening angle of throttle valve to a second target opening angle which is varied according to an operating variable (depression stroke) of an accelerator operator (accelerator pedal).

Abstract: A fail-safe circuit of a fixed speed traveling apparatus wherein there are provided with a control valve for introducing an engine negative pressure to an actuator which controls a throttle opening degree, a release valve for introducing an atmospheric pressure to an actuator and a control circuit for controlling the control valve and the release valve. At brake ON, a first cancel signal is supplied to the control circuit for canceling a fixed speed traveling and to open a current passage of the release valve. A second cancel signal is generated to the control circuit in the case where the current passage of the release valve is open.

Abstract: A fixed speed cruising control apparatus for a vehicle comprises a cruising speed detecting means, a signal smoothening means, smoothening-characteristic adjusting means, and a driving force control means wherein the signal-smoothening-characteristic adjusting means generates to the signal smoothening means a signal on the basis of a smoothened cruising speed signal from the signal smoothening means so that noise components in the smoothened cruising speed signal are cancelled in the smoothening means.

Abstract: The invention is directed to a method and an apparatus for adapting the characteristic of a final controlling element to eliminate disturbances and other undesired influencing quantities and, particularly for adapting the controller characteristic for the idle air charge control of internal combustion engines. A desired air quantity value issued by a regulator on the basis of various operating conditions is corrected by multiplicative and/or additive action prior to being delivered to an idle control element, for example, by means of which a change is effected in the cross-sectional area of the opening of a bypass valve arranged in the fuel metering arrangement of the internal combustion engine. This correction relates to adapting a characteristic of the idle control element with respect to offset and slope. This is accomplished by evaluating the output signals of at least one offset integrator or one slope integrator to generate an adapted electrical actuating quantity for the idle control element.

Abstract: The inventive control system introduces the current (.DELTA.I) and voltage (.DELTA.C) deviations simultaneously with the injection set point (C) to define a new injection set point (C') that is utilized in conjunction with the measurement of diesel engine speed (V.sub.rD) to adjust the injection and with the measurement of the injection flow rate C.sub.r to adjust the generator excitation current.

Abstract: A governor is disclosed for governing engine and road speed for motor vehicles. A movable overriding throttle closing device limits the speed to governed values. An actuator for the device is moved by a reversible motor to a reference position when a speed call-in value is reached and the actuator is moved at slow speed to maintain the governed speed. The actuator is moved to an intermediate position closely adjacent to the reference position for speeds below the call-in value. An engine power demand control system is provided to cause the actuator to be moved in the wide open throttle direction in response to a sustained power demand.

Abstract: The need for an accurate measure of the throttle position exists so the electronic engine controller is employed: to continuously check the position of the throttle, to memorize the lowest throttle position reading from the throttle pot, and to define this position as closed throttle. The reading is then updated to compensate for wear in the throttle blade linkages or in the potentiometric device or due to temperature or other conditions. The electronic engine controller will read and retain the lowest measured value of the potentiometric voltage output. This value will then be stored in memory and identified as the closed throttle output until it is necessary to redefine it.

Abstract: A system and method for controlling an engine, in which a value correlative to an engine output is detected, a target value of the engine output correlative value is calculated on the basis of an angular displacement of an accelerator pedal and engine speed, the detected value correlative to the engine output is compared with the target value, an opening angle of a throttle valve located within a throttle chamber of the engine for adjusting an intake air quantity supplied to the engine according to its opening angle is calculated on the basis of the comparison result, and the throttle valve is actuated to adjust the intake air quantity according to the calculated opening angle so that the detected value correlative to the engine output coincides with the target value.

Abstract: A self-adaptive fuel control system for an internal combustion engine which provides maximum fuel economy by maintaining engine operation at a preselected point on the r.p.m. vs. fuel flow curve. Engine operation is maintained at the preselected point by sampling initial steady state engine speed, leaning the fuel mixture supplied to the engine until there is a predetermined drop in engine speed, enriching the fuel mixture to attain an increase in engine speed, resampling engine speed and then repeating the process.

Abstract: When a driver repeatedly depresses an accelerator pedal only slightly to drive his vehicle small distances forward, as he might on a busy road, the ordinary accelerator pedal control characteristics are automatically changed to fine control characteristics such that opening rate of the throttle valve increases relatively gently with increasing accelerator pedal stroke. The control characteristics are changed from the ordinary ones to the fine ones, when both of detected accelerator pedal stroke and stroke speed do not exceed predetermined reference values within a predetermined time period after the accelerator pedal has been depressed.

Abstract: A control system for a drag race vehicle limits engine RPM to a selected Launch RPM limit when the vehicle is staged at the starting line and which limits engine RPM to an Elapsed Time RPM limit after the vehicle is shifted to high gear. The Launch RPM control is controlled by the same driver-controlled Launch switch which controls the line lock or transmission brake solenoid, so that the Launch RPM limit is removed at the same time that the vehicle is permitted to move forward. The Elapsed Time RPM control is actuated by a second driver-controlled Elapsed Time Enable switch. The control system is particularly useful for Super Class drag racers, in which the winner must be the first to the finish line without going under a predetermined elapsed time.

Abstract: In an externally ignited internal combustion engine for a vehicle with an electronic device for controlling the gas mixture composition and the point of ignition a leaner fuel-air mixture and the an earlier point of ignition is set before the maximum permissible speed is attained. The reduction of power of the combustion engine caused thereby shows the driver that the speed of the combustion engine approaches the maximum permissible speed at which the fuel supply and the ignition will be interrupted. This should cause the driver to release the gas pedal or switch into the next higher gear.

Abstract: The invention is directed to a method and an apparatus for adapting the characteristic of a final controlling element to eliminate disturbances and other undesired influencing quantities and, particularly for adapting the controller characteristic for the idle air charge control of internal combustion engines. A desired air quantity value issued by a regulator on the basis of various operating conditions is corrected by multiplicative and/or additive action prior to being delivered to an idle control element, for example, by means of which a change is effected in the cross-sectional area of the opening of a bypass valve arranged in the fuel metering arrangement of the internal combustion engine. This correction relates to adapting a characteristic of the idle control element with respect to offset and slope. This is accomplished by evaluating the output signals of at least one offset integrator or one slope integrator to generate an adapted electrical actuating quantity for the idle control element.

Abstract: The present invention relates to a device ascertaining that a vehicle does not exceed a pre-set speed limit and/or a pre-set engine RPM limit. Said device comprises means for transferring the input movement from the accelerator to means for contacting the output movement; means for transferring said output movement to the speed control unit; electrical means actuating said control means at the proper time, means for reading the speed and/or the engine RPM and means for pre-setting the desired speed limit and/or engine RPM limit. Said device may comprise additional means for protecting the vehicle to be driven by unauthorized persons. The device may be utilized for any vehicle and/or machine which is actuated by a lever and the drawing distance together with the load determine the speed, e.g., cars, airplanes, tractors and other agricultural implements.

Abstract: An engine control apparatus of fuel supply preferential type in which the rate of fuel supply is controlled in accordance with the amount of operation of an accelerator pedal and the operation condition of the engine, and the opening of the throttle valve is controlled in accordance with a command opening which is determined by the rate of the fuel supply is disclosed. For ensuring a good air-fuel ratio control, the control apparatus comprises first closed loop control adapted to detect the throttle valve opening and to effect a control to make the throttle valve opening converge at the command opening and second closed loop control adapted to detect the air-flow ratio of the air-fuel mixture fed to the engine wth air-fuel ratio sensor which detects oxygen concentration in the exhaust gases from the engine and to effect a control to make the air-fuel ratio converge at a command air-fuel ratio.

Abstract: An intake air amount control apparatus of an internal combustion engine controls an air control valve provided at a by-path formed with respect to a throttle valve which is provided in an intake air path of the engine. When the open-loop control mode of the engine is set, the apparatus determines which of the feedback loop and the open-loop control mode has been performed. When it is found that the feedback loop control mode has been switched to the open-loop control mode, a control amount corresponding to a current cooling water temperature of the engine is read out from a preset map, thus preparing for the following open-loop control. Simultaneously, a control amount in the previous feedback control mode is read out, and a current open-loop control amount is calculated by adding a compensation value to the thus read-out control amount. When it is determined that the open-loop control mode is continuously performed, a control amount corresponding to the current cooling water temperature is read from the map.

Abstract: An idle speed control device is disclosed for an internal combustion engine controlled by a throttle wherein the device has a throttle stop positioning shaft for the throttle and a threaded drive gear that engages threads on the shaft and on turning in one direction retracts the shaft and connected throttle stop on turning in the opposite direction extends the shaft to a maximum throttle stop positioned where the gear disengages from the shaft and then can freewheel in the opposite direction without forcing further extension of the shaft. A conical spring received on the shaft has a small diameter end adapted to self-lock to the shaft and a large diameter end adapted to be engaged by the gear to compress the spring as the shaft is fully extended whereby the spring is loaded to forcibly re-engage the gear with the shaft when the gear is turned in the one direction to initiate retraction of the throttle stop when fully extended.

Abstract: An automobile constant speed running device wherein a member influencing fuel/air/mixture gas is controlled with a simple mechanical device to control the speed of the automobile to be at a desired set speed. The device includes a wire connected to the member influencing the fuel/air/mixture, a wire winding drum, a gear integral with this drum, a worm meshed with this gear and a shaft movable laterally to place this worm to be disengaged and engaged with the gear so as to be controllable.

Abstract: An intake system of an engine comprising a main intake passage which has a throttle valve therein. The throttle valve is controlled by a main actuator. An auxiliary intake passage is branched off from the main intake passage located upstream of the throttle valve and is connected to the main intake passage located downstream of the throttle valve. An auxiliary valve, controlled by a subactuator, is arranged in the auxiliary intake passage. The vehicle speed is controlled by the main actuator when the vehicle speed is too increased or too reduced relative to a set speed to be maintained. Contrary to this, the vehicle speed is controlled by the subactuator when the vehicle speed is maintained at a speed near the set speed.

Abstract: An illustrative embodiment of the invention provides a four cycle internal combustion engine that produces one power stroke for each full rotation of the crankshaft. Direct fuel and oxidizer injection into the cylinder permits engine speed and power to be controlled by varying the duration of the intake stroke. This duration is controlled, moreover, by moving the distributor housing in relation to piston top dead center position.

Abstract: The present invention relates to a device for controlling the position of an element of an automobile internal combustion engine which controls the fuel-air mixture, comprising a desired-value transmitter 2 for producing an electric desired-value signal which can be fed to a electronic control unit 14. A setting member 19 for displacing a throttle valve 20 into a position corresponding to the position of the desired-value transmitter 2 can be controlled by the electronic control unit 14. In order to make smooth starting possible, a controller unit 15, by which the control of the setting member 19 is regulated upon the starting, is arranged between the desired-value transmitter 2 and the electronic control unit 14.

Abstract: An engine governor is disclosed which includes a tachometer circuit, a control signal generator responsive to the tachometer circuit and to a threshold generating circuit, a pressure/temperature fault detector, and a logic circuit responsive to the control signal generating circuit and the fault detector. A driver circuit is responsive to the signal passed by the logic circuit. The driver circuit controls a proportional solenoid which in turn controls engine speed. The tachometer circuit of this invention utilizes a gated sample and hold circuit which is triggered in phase with the AC component of a voltage on an integrating capacitor in order to provide particularly fast response times. The disclosed governor is arranged in a modular fashion such that removable tachometer circuits can be plugged into a common driver circuit.

Abstract: A control signal which corresponds to an actual operating condition of the engine is determined on the basis of the design specifications irrespective of an actual operation amount of an operating member of the fuel injection apparatus. The result of the determination is provided for controlling a coupled apparatus which is equipped with the engine.

Abstract: The cross-sectional area of a bypass passage around a throttle valve in an intake passage of an internal combustion engine is additionally increased by a predetermined value only when the throttle valve changes from an open position to the fully closed position during a heavy load condition or during a transitional condition from the heavy load condition to a light load condition. Therefore, the flow rate of the intake air at deceleration is not additionally increased during a light load condition, since that would cause the operation of the engine to be stable during deceleration.

Abstract: System for controlling the speed of a vehicle such as an automobile. The operator selects the desired speed, and thereafter the system brings the vehicle to the desired speed and maintains it at that speed. The system can be calibrated for any given vehicle, and it cannot be engaged until the vehicle is moving at a predetermined percentage or fraction of the desired speed. The system can be disengaged in a number of ways to return full control of the vehicle to the operator, and redundant circuits are employed to assure disengagement upon application of the brakes. As the desired speed is approached, the amount of correction is decreased to assure a smooth, positive transition to the desired speed.

Abstract: A fuel limit controller includes a computer supplying a commanded absolute EGR control pressure that is a measure of fuel supplied per diesel engine revolution. An absolute EGR control pressure equal to the commanded absolute pressure is generated from a subatmospheric pressure source and atmospheric air so that the absolute EGR control pressure is limited to atmospheric pressure. Fuel per engine revolution is limited to the value represented by the absolute EGR control pressure so that the fuel limit is automatically compensated for altitude variations. The rate of change in the fuel limit in response to changes in the absolute EGR control pressure is limited to delay increases in fuel to match the time to purge excess exhaust gases from the engine intake manifold.

Abstract: An electronic regulating device for regulating the rpm of an internal combustion engine having self-ignition in accordance with at least rpm, fuel quantity and accelerator-pedal position is proposed. The device has a PI regulator with feedback, for example, and is characterized in that the regulator itself is controllable in accordance with the respective rpm deviation. This is effected, with a view to the desired stability of operation, even in the presence of very steep characteristic curves, and the control is effected with a limitation of the respective maximum rpm deviation. To this end, one upper and one lower threshold characteristic curve are realized at either side of a static shutoff characteristic curve. These threshold curves are formed in accordance with rpm and accelerator-pedal position, and where there is a discrete regulator structure, in the case of limitation, they determine the voltage over the capacitor of the regulator determining the I component.

Abstract: An electronic ignition and fuel control system is provided for internal combustion automotive vehicle engines which are of the spark ignition type. The ignition and fuel control system of this invention includes an electronic timing and detector circuit, distributor circuit, clock and command circuit, ignition power circuit and air-fuel control circuit. The clock and command circuit responds to selected positioning of an accelerator control element to provide either a plurality of firing pulses to the engine ignitors in an acceleration mode of operation, or to provide single pulse firing in the case of steady state operation or a deceleration mode of operation. In the ignition and power circuit, individual coils are provided for generating a high voltage firing pulse applied to each of the ignitors that are interconnected with the respective coil.

Abstract: A device is proposed for drift compensation in fuel metering systems, in which it is not the metered quantity as such which is controlled in closed-loop fashion, but rather only the position of a quantity-determining member. The object of the invention is to maintain or re-obtain the original association between the fuel quantity and the position signal of the quantity-determining member for the purpose of providing a correct indication of the load state existing at a particular time. The drift compensation is intended to be capable of being performed manually, semi-automatically, or automatically, in an additive and/or multiplicative manner. It can furthermore be realized via a preferably rpm-dependent characteristic curve. The various values may be ascertained, for instance, in connection with running-out and running-up tests.

Abstract: A motor vehicle throttle valve positioner consisting of an elongated screw means moving the throttle valve and providing two ranges of movement, one being an engine idle speed mode of operation to maintain the engine at the correct idling speed level as determined by a microprocessor or similar electronic control, the other being a speed control mode of operation wherein a chosen engine off-idle speed level is maintained, and a failsafe operation returning the throttle valve to the idle speed range in the event of electrical failure or termination of the speed control mode of operation.

Abstract: A set switch 28 is connected via a first gate 34 to an analog switch 16, a speed incrementing circuit 36, and a latch circuit 30, but is connected directly to a second gate 22. When set switch 28 is actuated, a setting signal is passed through the first gate 34, unless the gate is closed by a signal from an upper-speed limit switch 38, thereby actuating analog switch 16 to pass vehicle speed signals from detector 10 to a storage device 18, and actuating latch circuit 30 to partially enable second gate 22. When set switch 28 is released, analog switch 16 closes, thereby storing the present vehicle speed signal in device 18 as a desired speed signal, and second gate 22 is fully enabled, thereby passing an actual speed/desired speed difference signal from comparator 20 to a speed controller 26.

Abstract: Fuel consumption of a declerating automotive vehicle internal combustion engine is reduced while preventing stalling. In response to a valve for selectively supplying air and fuel to the engine being in a fully closed condition, a first signal is derived. In response to the engine speed dropping below a first predetermined value a second signal is derived. In response to derivation of the first and second signals a controller for the valve is activated. The controller responds to engine and brake responsive parameters of the vehicle for opening the valve in respone to any of: (a) the engine being decelerated under no load, and (b) the brake being abruptly applied and (c) the engine speed dropping below a second value. The second value is less than the first value and is determined in response to the rate of change of engine speed.

Abstract: A speed control for a wheeled vehicle which is propelled by a motive device that has a speed proportional to the vehicle speed, and a power output control to control the speed of the motive device. A first signal generator generates a signal proportional to a desired vehicle speed. A second signal generator generates a signal proportional to the actual vehicle speed. A comparator compares the signals to detect any difference, and controls an actuator to adjust the power output control to tend to eliminate the difference. The actual speed will thereby tend to approach the desired speed. The first signal generator can, if desired, be operated by the occupant of the vehicle as part of his propulsive effort, for example by driving a bicycle chain drive. The speed control also can have provisions to continue operations at a pre-set rate even when the first signal generator may be inactive, and to make appropriate power control settings at start-up and at the beginning of acceleration conditions.

Abstract: A control apparatus for controlling the fuel metering device of an internal combustion engine uses a computer and servomotor to override the accelerator when the engine reaches a predetermined threshold speed for a selected throttle valve position. Preset values stored in the computer assure favorable fuel consumption during acceleration above the threshold speed.

Abstract: For use on an automotive vehicle equipped with an internal combustion engine and an automatic speed control system, a device for detecting accidental engine load removal and for providing disengagement of the speed control system to prevent an engine runaway condition. The device comprises a circuit that compares present engine speed with a previous engine speed furnished after a time delay to produce an output signal when a preselected engine speed differential occurs during the delay period. The output signal is utilized to disengage the speed control system directly or alternatively, to turn off the engine ignition system.

Abstract: A device for the control of the traveling speed of a motor vehicle with a control member actuatable by the vehicle driver, particularly a gas pedal, which is coupled with a first position encoder or indicator, with an electric controller for the transmission of the adjustment movement of the control member to an element, which element influences the fuel-air mixture, particularly to a dosing member of a fuel injection pump, by means of an electric motor, the electric motor being in operative connection with the dosing member and acting against the force of a return spring, which electric motor is supplied with a motor current which current is formed in the controller, as well as with a second position encoder which second position encoder is coupled with the dosing member, the second position encoder being arranged in a feedback circuit with inclusion of the controller.

Abstract: A device for the control of the traveling speed of a motor vehicle with an electrical controller applied by an actual speed signal and a desired speed signal, an output stage which contains a servo-motor being in operative connection with an element, preferably the throttle valve, which element influences the ratio of the fuel-air mixture that is supplied to the vehicle engine, and the output stage being electrically connected to a first switch which is coupled to the foot brake to switch the output stage into an inoperative condition if the foot brake is actuated. An additional switch which is actuatable by output stage, which switches are disposed in an electrical control circuit (which circuit influences the rotational speed of the engine) are embodied such that if the brake is actuated and if the output stage is outside the idling position the control circuit is controlled in the sense of a reduction of the rotational speed.

Abstract: An apparatus for regulating the traveling speed of a motor vehicle has a regulating device connected to control the fuel-air mixture supplied to the vehicle engine, with a safety circuit including a switching-off device responsive to a prespecified deceleration of the vehicle to deactuate the regulating device.

Abstract: A motor vehicle speed governor has safety features to assure that the throttle is released when the brake pedal is depressed even if malfunctions occur in certain components of the system. The speed governor has a servo for moving the throttle, an accelerator device for causing the servo to advance the throttle, a decelerator device for releasing the throttle, a control circuit for controlling the accelerator and decelerator devices in response to vehicle speed, and a power circuit that energizes the control circuit. The power circuit is connected into the brake electrical line. It includes a latching device that is powered through the ignition switch, but will latch and conduct only when energized by a set/on switch. The set/on switch requires power in the brake line across the brake fuse. The resume switch also requires power from the brake line across the brake fuse. A brake switch in the brake line is closed by depressing the brake pedal, sending a signal to the control circuit to release the throttle.

Abstract: Idle air control apparatus for a vehicle driving internal combustion engine having an air induction passage includes a control valve in the air induction passage controlled by a stepper motor in response to the arithmetic count of applied electrical pulses, a register effective to store a valve control number representing the currently desired position of the control valve, apparatus effective upon occurrence of a predetermined engine loading event to change the valve control number in response thereto, an up-down counter effective to arithmetically count the pulses applied to the stepper motor and thus indicate actual control valve position, a closed loop control effective to compare the contents of the up-down counter and register and apply pulses to the stepper motor at the first predetermined rate to reduce any difference therebetween and a speed trim loop active only during occurrence of a predetermined steady state idle condition to compare actual engine speed with the desired engine idle speed and arit

Abstract: In a speed control system for vehicles, a speed-difference calculation circuit calculates an absolute value of a time difference between a predetermined period of time corresponding with a desired speed and the actual period of time corresponding with the actual speed, an acceleration calculation circuit calculates an absolute value of a time difference between the preceding and following actual periods of time within a limited range, and correction signal generator calculates a sum of the absolute values when each sign of the calculated time differences is positive or negative and calculates a difference between the absolute values when respective signs of the calculated time differences are opposite to each other. The signal generator selectively produces correction signals related to the calculated sum and the calculated difference.

Abstract: A device for the control of the traveling speed of a motor vehicle with a regulating member actuatable by the vehicle driver, the gas pedal emitting an electrical signal, the gas pedal being connected with the desired value input of an electrical controller, the output signal of which acts on a positioning actuator, the latter being coupled with the element, particularly the throttle valve, which influences the fuel-air mixture, the instantaneous setting position of the positioning actuator being transmitted as an electric signal to the actual value input of the controller. The actual value input or the desired value input of the controller is driven by a circuit which produces a signal for influencing the position of the throttle valve, which signal is dependent on at least one factor to be monitored.

Abstract: An apparatus and method having a first unit for creating mechanical movement with a certain frequency ofmovement. A second unit is operatively associated with the first unit for producing a pulsing electrical signal that has a pulse rate substantially proportional to the frequency of movement. A third unit is operatively associated with the second unit for producing a pneumatic signal that is substantially proportional to the pulse rate of the pulsing electrical signal.

Abstract: A speed control for an engine having a throttle and a drive shaft made up of a selective gear connected to a differential gear and a responsive gear connected to a second differential gear all rotatable about a common axis. Two differential pinions rotatably connected to the differential gears and supported on a pinion shaft disposed at right angles to the axis. The center of the pinion shaft being attached to a drum mounted concentric to the axis and having an actuating member connected from the drum to the engine throttle and a reference motor operatively connected to the first side gear to drive it at a selected speed and a drive shaft from the engine driving the second side gear.

Abstract: Device for the control of the traveling speed of a motor vehicle with a vehicle-driver-actuatable gas pedal and with means for the transmission of the movement of the gas pedal to an element which element influences the fuel-air mixture particularly the throttle valve, which means contain a position encoder with a rheostat and a limit switch, the position encoder being coupled with the gas pedal. The position encoder has a housing with a hollow cylindrical interior space in which the rheostat is located, the latter being fixed to the housing prevented from twisting with one of its two relatively moveable parts.

Abstract: Saving fuel in the operation of a motor vehicle by providing an increased resistance to depression of a gas pedal at increased velocities in a predetermined speed range from a lower velocity up to a predetermined upper velocity. A piston is urged against the pedal by a spring in a cylinder. Adjustments in vacuum in the cylinder are utilized to adjust the spring force constituting the resistance to pedal depression of the piston.

Abstract: Device for controlling of the traveling speed of a motor vehicle with an electrical controller, which controller, by an electrical adjusting device in dependency on a desired value which is fed-in or stored by the driver via one or more manually actuatable first actuating elements, acts on an element which influences the ratio of the fuel-air mixture fed to the motor vehicle, particularly the throttle valve, and its adjusting device is switchable inoperatively off by second actuating elements. Elements are provided by which the controller can be turned off if at least one first actuating element and at least one second actuating element are in their active position or condition.

Abstract: Engine fuel control system includes a slow fuel passage for providing a supply of fuel mostly under a light load engine operation. A solenoid type shut-off valve is provided in the slow fuel passage so that the fuel supply is cut-off during deceleration. The valve is opened when the engine speed is decreased to a certain value to recover the fuel supply. The engine speed under which the fuel supply is recovered is lower when the vehicle brake is actuated than that when the brake is not actuated.