Abstract: A new cruise control economizer for utilizing momentum gained on downhill travel which operates by selectively overriding a throttle on a vehicle with electronic throttle controls during and after the vehicle is traveling down an incline gaining momentum with minimum fuel consumption. The inventive device includes at least one POM (prolongation of momentum) switch, a microcontroller, a vehicle speed input, a brakes or clutch pressed input, and a vehicle setback throttle means to override cruise control output and send modified throttle setting signals that override electronic cruise controls.

Abstract: In a vehicle including an automatic traveling device such as an auto-cruising device, an auto-following device, an auto-steering device and the like, which is capable of maintaining traveling of the vehicle in a state in which a driver has released his or her foot from an accelerator pedal, a relief valve and an on-off valve are incorporated in parallel in a pipeline which connects a master cylinder (2) and brake calipers. The closing of the on-off valve (6) during operation of the automatic traveling device ensures that even if the driver merely puts his or her foot on a brake pedal, a hydraulic braking pressure is not transmitted unless a depression force sufficient to permit the hydraulic braking pressure to exceed an opening pressure for the relief valve (5) is applied.

Abstract: A process carries out an automatic braking operation in which, when the return speed of the accelerator pedal exceeds a threshold value and a transfer of the driver's foot from the accelerator pedal to the brake pedal is determined, an automatic braking operation is triggered. During that operation, a brake pressure is generated in the wheel brakes and is terminated when either a defined time has been exceeded since the triggering of the braking operation or when an operation of the brake pedal takes place by the driver. A support of the driver is ensured when operating the brake pedal in critical driving situations and a brake pressure buildup is carried out even before the operation of the brake pedal by the driver. After the automatic braking operation has been triggered, monitoring occurs to determine whether the time derivation of a quantity representing the operation of the brake pedal exceeds a threshold rise value.

Abstract: A vehicle speed control system for automatically sustaining a vehicle speed at a driver's setting, and decreasing the vehicle speed with decrease in a distance to a vehicle ahead, includes an input section for collecting information on a road situation ahead and a controller for adapting the speed control characteristic to the road situation. The input section of one embodiment includes an image sensing camera for forming an electronic image of the road ahead, and the controller is configured to detect edges such as derivative edges in the image and determine a correction quantity in accordance with the number of detected edges. The controller adjusts the control characteristic by using the correction quantity.

Abstract: A motorcycle having a throttle rolloff switch that is operatively associated with the throttle control and the cruise control device to deactivate the cruise control device when the throttle control is rotated to reduce the speed of the motorcycle. The rolloff switch includes a magnetically-sensitive sensor, a magnet positioned in spaced relation to the sensor and movable relative to the sensor, and a coil spring positioned between the sensor and the magnet so that the sensor and the magnet are normally biased in separated relation.

Abstract: An apparatus for controlling the load of an engine associated with a hydrostatic drive system is disclosed. The apparatus includes a variable displacement pump rotatably driven by the engine. The apparatus modifies a pump displacement command signal in response to the actual and desired engine speed acceleration. The modified pump displacement command signal is used to control the displacement of a variable pump in order to regulate the load on the engine to achieve optimum efficiency.

Abstract: A cruise control governor which is able to dynamically define and switch between various goal droop curves in order to find the best goal droop curve for use with the current vehicle driving situation. For instance, the present invention will dynamically define and select different goal droop curves when the vehicle is lugging up a hill, coasting down a hill, cruising on level ground, preparing to crest a hill, or preparing to transition off of a downhill slope.

Abstract: A feedback calculator and a controller are disclosed which energize a throttle valve driver so that a vehicle speed Vs may be brought into coincidence with a target vehicle speed Vo which is instructed by a driver. The feedback calculator calculates a target acceleration AT on the basis of a vehicle speed Vs and a target speed Vo, and also detects a running acceleration Aa of the vehicle and calculates a deviation of the running acceleration Aa with respect to the target acceleration AT, Ad=AT-Aa. It chooses a high gain G when the deviation Ad is positive and its change dAd is also positive, and chooses a low gain G when the deviation Ad is negative and its change dAd is also negative, thus deriving a controlled variable D having a magnitude which depends on the deviation Ad and the gain G. The controller energizes the throttle valve driver in accordance with the controlled variable D, thus driving the throttle valve for opening or closing at a rate which depends on the controlled variable D.

Abstract: The present invention is directed to a wireless cruise control apparatus and control system therefore, comprising a transmitter, a receiver and interface circuitry. The transmitter may be a small battery powered device which releasably attaches to a steering wheel or other portion of an automobile providing the driver with an easily accessible control panel for the automobile's cruise control. By depressing the appropriate command button the transmitter then broadcasts through air, such as by radio frequency transmission, the desired action to be taken which is then received by the receiver. Upon reception the radio frequency transmission is decoded in order to interpret the driver's desired command which is then implemented through the driver circuitry which supplies the appropriate control signals to the cruise control system.

Abstract: Disclosed is a system and method for controlling a vehicle speed of an electric vehicle so as to be operated at a designated constant vehicle speed. When the constant speed running mode is selected and the vehicle speed is designated to a given vehicle speed, a motor torque needed for the constant speed running is instructed to a motor controller. When an accelerator pedal is depressed during the constant speed running, the motor torque is compared with an accelerator torque corresponding to the amount of depression of the accelerator pedal. If the accelerator torque is larger than the motor torque, the vehicle is accelerated and if the accelerator torque is smaller than the motor torque, the vehicle is kept running at or is returned to the designated constant speed, thereby a smooth passing or lane changing during the constant speed running can be made.

Abstract: A downhill coasting situation detecting device for an automotive vehicle comprises a sensor for detecting an opening degree of a throttle valve for an engine of the automotive vehicle, a first derivative calculating device for calculating a first derivative of the vehicle speed, a second derivative calculating device for calculating a second derivative of the vehicle speed, and a downhill coasting situation determining device for determining that the automotive vehicle being in a downhill coasting situation in which the vehicle being coasting on a downhill road in accordance with a condition in which the opening degree of the throttle valve is zero and the first derivative of vehicle speed is positive and besides the second derivative of vehicle speed is nearly equal to zero. With the downhill coasting situation detecting device, the downhill coasting situation can be exactly detected, so that e.g.

Abstract: A cruise control road speed control device provides an attenuating member connected between the speed control and the fuel injection volume adjusting member. The attenuating member feeds the controller output signal in a lower value range to the adjusting member after attenuation. This measure suppresses the undesired rpm oscillations and thus, even with cruise control operation at low engine loads, permits satisfactory driving comfort without perceptible juddering effects. The cruise control can be used for controlling the road speed of commercial vehicles with Diesel engines and automatic transmissions.

Abstract: The present invention relates to devices used to activate cruise Systems within a vehicle, but more particularly relates to a combination including a cruise control system which is activated by a typical ten-key pad, such as used with adding machines, TV remote control pads, numerical keys on a computer, etc.

Abstract: A method and apparatus for limiting the speed of a motor vehicle in which the power applied to the vehicle wheels is controlled even when the actual speed is within a range of permitted speeds, but a speed demanded by the driver is in a speed range to be avoided. By way of the control intervention, the actual speed is, in this case, brought to the limiting speed in accordance with a specified open-loop control characteristic. When the actual speed is near the limiting speed, the system switches over to an open-loop speed-control, and when the speed demanded by the driver is within the range of permitted speeds, this requirement of the driver is used to determine the speed.

Abstract: A constant speed regulator apparatus includes a vehicle speed sensing unit which detects a vehicle speed of an automotive vehicle. An idle switch unit detects an OFF state of a throttle valve. A throttle adjusting actuator adjusts a throttle opening angle of the throttle valve to vary the vehicle speed. A target speed determining unit determines a target speed by using the vehicle speed which is detected by the vehicle speed sensing unit immediately after the OFF state of the throttle valve is detected by the idle switch unit. An actuator control unit regulates the throttle adjusting actuator so that the vehicle speed is maintained at the target speed determined by the target speed determining unit.

Abstract: An automatic vehicle speed controlling apparatus for a vehicle includes a vehicle speed sensor for sensing the actual speed of the vehicle and providing actual speed data proportional to the actual speed of the vehicle, a command switch operable for generating a cruise command signal and an actuator for driving a throttle valve with the vehicle. The control unit is responsive to the actual speed data and the cruise command signal and includes storage memory for storing a desired speed datum in response to the cruise command signal. The control unit selectively generates a speed increasing signal and a speed decreasing signal in response to a difference between the actual speed data and the desired speed datum stored in the memory and supplying the speed increasing signal and the speed decreasing signal to the actuator.

Abstract: Electronic controls for compression release engine brakes of the type having electrically controlled valves for selectively applying high pressure hydraulic fluid to hydraulic actuators which open exhaust valves in the associated internal combustion engine to produce compression release events in the engine. The electronic controls may produce signals for both opening and closing the electrically controlled valves. The electronic controls may monitor various operating conditions of the engine and the vehicle powered by the engine and may automatically modify the timing of the compression release events in accordance with those conditions.

Abstract: The vehicle speed control arrangement according to the invention has a cruise control function module and a limitation function module to limit the speed to a variable, specified limiting speed which separates a range of permitted speeds from a range of speeds to be avoided. For the purpose of convenient and functionally reliable operation, the apparatus has an operating device for reciprocally activating either one or the other function module with simultaneous deactivation of the other module and for setting the required speed value in cruise control mode and a desired limiting-speed value in limitation mode.

Abstract: A constant speed travel control system uses a time period Q which is set such that, if a motor of the actuator is not locked but normally rotated, actuator opening becomes almost certainly fully closed within that time period with the result that a first limit switch is made open. If the motor is normal, the processing operation proceeds to a normal constant speed travel control by which an electric current to the motor ceases and "motor open" condition is detected. When no "motor open" state is detected, even after the elapse of the time period Q, under the condition that the vehicle speed is higher than a reference speed, a determination that the motor is in the locked condition is made and the operation proceeds to a speed control cancellation process.

Abstract: ECU performs a feedback control on a d.c. motor by a PID feedback control thereby to reduce errors between an actual throttle opening and a command throttle opening. PID control constants Kp, Ti and Td in the PID control are determined in accordance with operating conditions of a vehicle, such as engine idle speed control condition, vehicle traction control condition, vehicle cruise control condition and the like.

Abstract: A braking control for an engine permits the timing and duration of exhaust valve opening to be accurately determined independent of engine events so that braking power can be precisely controlled.

Abstract: A constant travel speed control apparatus is for use in a vehicle and utilizes time delay control which is a kind of adaptive control for estimating an unknown term. A plurality of targeted paths, each having a certain waveform, for causing the actual speed of the vehicle to converge on a target speed are provided and an error vector is defined on the basis of the paths. The actual speed of the vehicle can be made to converge on the target speed thereof with a constant convergence performance along a target path in spite of the fluctuation of vehicle dynamic characteristics.

Abstract: A control device and a control method capable of eliminating a torque variation in changing an air/fuel ratio and establishing a compatibility of promotion in fuel economy with promotion in drivability is provided. The device includes an outer environment detector for detecting an outer environment in running a vehicle, a running environment determining device for predicting a current running environment in accordance with the outer environment, a data storage device for storing data for changing a driving characteristic, a selecting device for selecting the data, a control quantity calculator for calculating a control quantity based on the data, and a control actuator for controlling a control object.

Abstract: A cruise control based retarder control. If the vehicle speed exceeds the cruise control set speed, the cruise control system continuously checks the vehicle speed and acceleration order to determine the optimum auxiliary brake level based upon the amount of overspeed and acceleration. The cruise control system allows the vehicle driver to select which auxiliary brakes will be applied to slow down the vehicle to the desired speed by means of the normal cabin brake switches, limited by the determined optimum brake level. The driver can therefore control which auxiliary brakes are applied, however the application of these brakes is controlled by the cruise control system without the need to exit cruise control mode. Operation of the auxiliary brakes by the cruise control system will normally reset in increased fuel economy over prior art systems which require exiting of the cruise control system, manual activation of the auxiliary brakes and resumption of the cruise control system.

Abstract: Described herein is a drive-by-wire vehicle engine output control system. The system permits good-response acceleration by a driver's simple and reasonable operation, i.e., by operating an accelerator pedal and also a prompt response even when a sudden load change occurs. Further, the system permits precise speed control by simple equipment even when the deviation of a vehicle speed from a target vehicle speed is large. Output changes of an engine can be controlled within a permissible output change range by (a) comparing a target autocruise engine output with an acceleration demanding ending output, choosing the larger engine output and then controlling the engine to give the larger engine output, (b) controlling the engine to achieve a target autocruise engine output obtained from a speed correction torque and a running load torque or (c) limiting an engine control quantity on the basis of a permissible output change value.

Abstract: When an "off" state of an IDLE switch is detected even once after an ignition switch of an internal combustion engine is turned on, a cruise ECU determines that the IDLE switch is normal, and performs constant-speed cruise control if the start thereof is instructed. Because the constant-speed cruise control is normally instructed while a vehicle is running, if the IDLE switch is normal, the IDLE switch becomes the "off" state at least one time during the time period until the start of the constant-speed cruise control is instructed after the ignition switch is turned on. For this reason, if the IDLE switch does not become the "off" state even once, the cruise ECU determines that the IDLE switch has failed and interrupts the constant-speed cruise control.

Abstract: When an overdrive cut is performed to an automatic transmission control when climbing uphill slopes, the actuator position An is stored in overdrive cut aperture storage value C with overdrive cut demands to the automatic transmission executed until the actuator position changes by a first predetermined value Ct1. If the condition C-An>Ct1 is satisfied for a predetermined period of time T0 until timer counter TMR becomes zero, then restoration to overdrive is allowed. Accordingly, even when cruising along long uphill roads, up-shifts to overdrive are prohibited during this time and because there are no up-shifts to overdrive during this time, vehicular speed does not change in fixed periods and thus, a high-level of passenger comfort is achieved.

Abstract: An electric powered bicycle having a dip sensor or switch and/or a gradient sensor or switch. The bicycle comprises front and rear wheels each rotatably supported by its frame; a chain slung between said wheels and a chain set for transferring manual power to said wheels; an electric motor coupled to one of said wheels for driving said wheel directly; and a power supply capable of supplying electric power to said motor. The dip or gradient sensors are associated with a pulse width modulation circuit.

Abstract: A sensor failure and erroneous signal detection system for use in automobiles equipped with cruise control. This system prevents cruise control from operating if certain predetermined conditions occur. Further, the system will determine if the cruise control signal has been erroneously generated and set up an error "flag". A failure is determined in the cruise control system if either one of the following conditions is present when a cruise control signal is generated: (1) the vehicle is traveling below a predetermined speed; (2) the brake switch is on; (2) the shift range is in "N", "R" or "P"; or (4) either (1), (2) or (3) continues for a predetermined period of time. Upon occurrence of (1), (2), (3), or (4), an error has been detected and the automatic transmission is instructed to return to normal operation.

Abstract: A speed selector (24, 25, 40) actuates a computer (32, 35, 38, 39) to calculate optimum engine speed, speed-change rate and gear ratio for achieving a selected speed of a motor vehicle (18). An actuator (36) then accomplishes throttling of an engine (19) with a throttling means (20) and gear changes of a transmission (21) as necessary to achieve the selected vehicle speed with least-possible fuel consumption and exhaust smog. When a desired change in speed is made, it is maintained in a cruise-control mode with optimized rates of change of throttling and gear-shifting for necessary changes in engine speed for varying terrain and driving conditions.

Abstract: An engine output control device executes control while also executing auto cruise control if traction control is executed during auto cruise running so that traction control and auto cruise control are established at the same time. If the traction control executed by a traction controller and the auto cruise runs, executed by an auto cruise controller, are established at the same time, then the auto cruise controller is released and, at the same time an accelerator signal (auto cruise accelerator signal), which is pseudo controlled by the speed during the running of the auto cruise, is calculated by a pseudo control accelerator signal calculation, and because traction control is executed for the auto cruise accelerator signal, the auto cruise control is restored. Consequently it is possible to execute auto cruise control continuously.

Abstract: The low cost speed governor for internal combustion engines may be completely powered by the ignition coil. The governor receives a periodic signal from the primary ignition winding that is indicative of the actual speed of the engine. A pulsed speed signal is generated that is functionally related to the periodic signal. The pulsed speed signal has a pulse width that is functionally related to the actual engine speed. A pulsed reference signal is generated by a timer circuit, and has a pulse width that is functionally related to a predetermined reference speed. The pulsed speed signal is then compared with the pulse reference signal by a comparator circuit, and a pulsed error signal is generated that has a pulse width which is functionally related to the difference between the speed signal pulse width and the reference signal pulse width. The speed of the device is then changed by a transistor bridge network as a function of the error signal.

Abstract: In a device for controlling the speed of a motor vehicle in which a power-setting member for the internal combustion engine of the vehicle can be displaced via a switchable coupling by an electric motor, the electric motor receives the voltage necessary for the displacement of the power-setting member for the speed to be maintained from a control device, and the coupling is adapted to be switched by means of an electromagnet for separating the motor from the power-setting member when the device for controlling the speed is not in action. A first controllable switch is connected between one pole of the source of operating voltage and the electromagnet and a second controllable switch is connected between the other pole of the source of operating voltage and the electromagnet. The switches are adapted to be switched into conductive state by means of an operating element.

Abstract: A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise .control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.

Abstract: A navigation device for land vehicles, particularly for passenger cars and trucks, is proposed which has a storage for geographical data, sensors for detecting actual travel data, a comparison device, and an information delivery device. The navigation device is characterized by the fact that the limit speed (v.sub.i) safe for travel over the path of travel is determined in a calculating unit (9) from the geographical data concerning the course of the path of the travel and is compared with the instantaneous speed of the vehicle. When the limit speed is exceeded in positive or negative direction, an information delivery device (11) is activated and possibly also a conversion device (13), they acting on setting members, for instance brakes or engine control of the vehicle.

Abstract: When the vehicle has deviated or is deviating from a lane on which the vehicle has been or is running, the deviation of the vehicle from the lane can be suppressed, for example, by allowing the steering wheel to be operatively rotated prior to an intention of the operator. The timing of suppressing the deviation of the vehicle can be altered in accordance with conditions including, for example, the existence of a lane in the direction of deviation of the vehicle on which another vehicle is running in the same direction, the existence of an obstacle in the direction of deviation of the vehicle, the existence of an adjacent lane in the direction of deviation of the vehicle on which another vehicle is running in the opposite direction, a state of the lane on which the vehicle is running, such as a curved lane or a straight lane, a direction of deviation is outside or inside the curved lane or a lane width, a vehicle speed, a steering angle of a steering wheel, an extent of vision, and so on.

Abstract: A target torque is determined in a target torque determination device on the basis of an accelerator operation amount detected by an accelerator operation amount detector and power source output detected by a power source output detector. A target driving force is determined in a target driving-force determination device on the basis of driving force detected by a driving-force detector and the target torque. A target acceleration is determined in a target acceleration determination device on the basis of a travel resistance detected by a travel resistance detecting device and the target driving force. The operation of an actuator is controlled on the basis of an acceleration detected by an acceleration detecting device and the target acceleration. Thus, it is possible to provide a power source output control in accordance with the travel resistance, while simultaneously taking into consideration the current state of the power source and the responsiveness thereof.

Abstract: A vehicle speed control method and apparatus are provided which can ensure a smooth driving feeling even if an automotive vehicle has entered into an ascending sloped road during a constant speed control. The speed increasing control is stopped when the vehicle speed data obtained from the vehicle speed sensor is not greater than the memory vehicle speed, a deviation between the vehicle speed data and the memory vehicle speed is greater than a predetermined level and the acceleration at that time is greater than a predetermined level.

Abstract: A speed control system maintains vehicle speed at a desired speed by controlling the engine throttle. The speed control system includes feedback from a quadratic control signal having an amplitude related to a square of the speed error signal and also having the speed error signal's sign. The speed control system also includes integral feedback control and proportional feedback control.

Abstract: An automatic speed and distance control apparatus responsive to detected signals and operator induced signals for automatically controlling the speed of an automotive vehicle and its distance with respect to objects in its path of movement. A flexible control scheme is provided, which permits a driver to intervene in the operation of the system when he or she wishes to accelerate in preparation for a passing maneuver. Upon interruption of the operation by a vehicle driver, the control apparatus is interrupted for a predetermined period of time and thereafter resuming automatic control function.

Abstract: An engine control apparatus includes a first intake valve and a second intake valve provided along an intake passage. First and second actuators drive the respective throttle valves. A setting unit sets a vehicle target speed in the constant cruising speed control mode. A first control unit controls the first actuator so as to maintain the actual vehicle speed at the target speed during the constant cruising speed control mode. An angle sensor detects the angle of the first throttle valve. A mode memory stores information about a plurality of control modes to be used in controlling the second throttle valve. A mode selector selects one of the control modes. Each control mode stored in the mode memory defines the target angle of the second throttle valve that depends on the angle of the first throttle valve.

Abstract: An aromatic cruising speed controller for an automotive vehicle adjusts the throttle valve of the engine to perform the constant speed cruising control of the vehicle. A running resistance detector unit 18 calculates the running resistance R from the output torque T of the engine, the vehicle acceleration .alpha., and the engine set-up condition including the gear ratio G. During the transient period immediately after the cruising control is commenced or resumed, the torque T0 of the engine which is necessary for attaining the target vehicle speed V0 is determined from the running resistance R, the gear ratio G, and the target throttle position is determined on the basis of this torque T0. Under the steady state, on the other hand, the throttle position is controlled in accordance with the proportional plus integral control method, such that the deviation .DELTA.V of the vehicle speed V from the target vehicle speed V0 is reduced to zero.

Abstract: A speed control system having an operator actuable switch assembly providing a single multiplexed output. Decoding of a single momentary switch generates a standby mode when the speed control system is in the control mode, and generates a resume mode when the speed control system is in the standby mode. The decoding also provides the speed control system with the appropriate operator actuable commands only after all switches of the switch assembly are concurrently detected in a neutral or idle position.

Abstract: An apparatus for controlling an opening angle of a throttle valve in an internal combustion engine. When an accelerator pedal is depressed by a vehicular driver, an accelerator drum attached onto an end wall of a main body of a single motor is rotated via an accelerator wire and the main body of the motor, a drive axle of the motor held with respect to the main body of the motor, and a rotation axle of the throttle valve are integrally rotated. When control is transferred from the above-described ordinary opening angle control state into a traction control state, the hold function of the motor is released and the motor is driven so as to reduce the opening angle of the throttle valve.

Abstract: A hybrid motor vehicle utilizing electric motor propulsion prior to cruise mode detection condition and internal combustion engine propulsion during cruise mode.

Abstract: A variable power drivetrain engine control system for a heavy duty vehicle such as a tractor/trailer combination or truck is disclosed. The engine control system provides higher output capability for the engine of the vehicle in accordance with certain detected conditions. If the vehicle speed falls a predetermined DELTA miles/hour below a LEARNED SPEED of the vehicle, the engine is enabled to operate at a higher power output capability until the vehicle resumes the LEARNED SPEED. Further, high output capability is enabled when the vehicle deceleration is in excess of a predetermined deceleration rate. Again, the high output capability is disabled once the vehicle retains the LEARNED SPEED velocity. The quantity DELTA can be variable with respect to actual vehicle speed to provide more responsive operation of the variable power drivetrain system thereby providing improved responsiveness to road conditions in accordance with relative vehicle speed.

Abstract: In a constant speed driving device in which an amount of control of a throttle actuator for driving a throttle valve is calculated by using a control constant so that an actual vehicle speed reaches an aimed vehicle speed, the control constant is changed according to parameters corresponding to the effective operation and non-effective operation of a pressure-charger. Thus, with the device, the constant speed driving operation is achieved suitably independently of the operating conditions of the pressure-charger.

Abstract: A speed controller maintains the engine throttle at a desired throttle position based upon an initial throttle position and a speed error signal. The initial throttle position is generated by multiplying vehicle speed by a constant and adding an offset value related to throttle position at idle and speed control slack. The initial throttle position is adaptively updated by subtracting the above product from actual throttle position during speed control operation to learn a new offset value.

Abstract: A speed control system electronically controls the engine throttle to maintain vehicle speed at a reference speed in response to a control signal. The control signal is generated by multiplying a speed error signal by a gain value. Such gain value is provided with a variable amplitude having a first linear relationship to the error signal which is increased to a second linear relationship having greater sensitivity when the error signal exceeds a preselected amplitude.

Abstract: The present invention provides a constant operating speed holding system for a motorcycle, capable of inhibiting constant operating speed holding operation while the motorcycle is not moving. A constant operating speed hold inhibiting device inhibits the constant operating speed holding operation of a constant operating speed holding mechanism regardless of the operating speed V calculated by an operating speed calculating device when the rotating speed Nf of the free wheel of the motorcycle detected by a wheel speed detecting mechanism is very small.