Abstract: A cruise control system for an automotive vehicle, which automatically controls the throttle valve opening to maintain the vehicle speed constant without a driver's operation of the accelerator pedal once the vehicle speed is set to a desired value, is designed so that acceleration at the time of operating an increase set switch or resume switch is increased to ensure a comfortable drive while ascending a long slope. To this end, the cruise control system is provided with an overdrive controller which releases the overdrive at the time of operating the increase set switch and which resumes the overdrive at the time of releasing the operation of the increase set switch, or an overdrive controller which releases the overdrive at the time of operating the resume switch when the vehicle speed at that time is sufficiently lower than the set speed and which resumes the overdrive when the vehicle speed has been restored substantially to the set speed.

Abstract: Apparatus for controlling the speed of an automobile in which the speed is maintained at a preset speed when a resume switch is manipulated. A memory stores data corresponding to the preset speed. The difference between the preset speed and the actual speed of the automobile is detected and this difference is employed to switch the reduction ratio of transmission gears of the automobile. The reduction ratio is increased when the actual speed becomes a predetermined speed less than the preset speed and when a predetermined condition is established. The predetermined condition is, for example, a condition in which the actual speed is less than the predetermined speed, the actual degree of acceleration is less than the predetermined degree of acceleration, or a predetermined time period elapses after the resume switch is manipulated.

Abstract: A pneumatically operated speed governor (26) moves an engine throttle member (10) for controlling the speed of a vehicle. The governor includes a pneumatically operated actuator having an output connected to the engine throttle member. A pivotally mounted valve member (44) is positioned intermediate a vacuum supply orifice (46) and an atmospheric air orifice (48) and supplies a pneumatic signal to the actuator. An internal speed sensor (82) responsive to vehicle speed has an output member (100) which reacts against an improved, self-wiping minimum speed switch (102) and a set-speed control member (52) which in turn reacts against the pivotally mounted valve member (44) for varying the position of the valve member as the vehicle speed tends to fall below or rise above a predetermined set speed.

Abstract: An intervehicle distance control system for a vehicle which, when there exists a possibility of collision between the vehicle and an interfering object ahead thereof, generates a control signal and imparts to a vehicle accelerator member an operation reaction force corresponding to the control signal. The driver is thereby alerted as to a possibility of collision, while the selection of acceleration operation is substantially entrusted to the driver. In the absence of such control signal, the reaction force has a strength of substantially zero. Regardless of the vehicle speed, the driver will never suffer from a metal burden due to operation of the control system.

Abstract: An agricultural vehicle, such as a tractor, includes an engine and a hydraulic assist-type transmission coupled together by a clutch. A monitor includes sensors for sensing engine speed, clutch temperature and transmission temperature. Warning signals are generated if the clutch temperature is continuously and at least a certain amount hotter than the transmission temperature for a certain time period. The warning signals are disabled if the engine speed is less than a threshold and for a certain time interval after the engine speed exceeds the threshold.

Abstract: A cruise control system for an automotive vehicle, which automatically controls the throttle valve opening to maintain the vehicle speed constant without a driver's operation of the accelerator pedal once the vehicle speed is set to a desired value, is designed so that acceleration at the time of operating an increase set switch or resume switch is increased to ensure a comfortable drive while ascending a long slope. To this end, the cruise control system is provided with an overdrive controller which releases the overdrive at the time of operating the increase set switch and which resumes the overdrive at the time of releasing the operation of the increase set switch, or an overdrive controller which releases the overdrive at the time of operating the resume switch when the vehicle speed at that time is sufficiently lower than the set speed and which resumes the overdrive when the vehicle speed has been restored substantially to the set speed.

Abstract: Linkage is disclosed for adjusting the position of a diesel engine injection pump control rack in dependence on the position of the driver's accelerator pedal and also on a system for automatically maintaining the vehicle speed at a desired value. The injection pump rack is positioned by means of a pneumatic piston-cylinder assembly and connecting linkage. The pressure in the piston-cylinder assembly is adjusted by means of a driver-controlled valve in a supply line from a pressure source, and this valve is adjusted by the driver's accelerator pedal. A normally open valve is also connected in the pressure circuit and a normally closed exhaust valve is provided. When the automatic speed control system is in operation, the driver fully opens the driver-controlled valve (by fully depressing his foot pedal) and the automatic system adjusts the other valves to hold the speed at the desired value.

Abstract: A speed control system of a motor vehicle for constantly maintaining a selected speed having an internal combustion engine which includes a turbocharger having a compressor wheel and electronically controlled fuel injectors which includes a vacuum actuator provided with a vacuum chamber having a first inlet port for inducting vacuum pressure, a second inlet port for inducting atmospheric air and further including a throttle valve and diaphragm which controls the throttle valve in accordance with vacuum pressure in the vacuum chamber, a member for generating a signal in accordance with the difference between the selected speed of the motor vehicle and actual speed of the motor vehicle, a modulating valve for controlling the first inlet port and the second inlet port by the signal delivered from the signal member to thereby modulate the vacuum pressure within the vacuum chamber, an intake manifold, a first passage communicated with the first inlet port and the intake manifold, a second passage communicated with

Abstract: An aspirator using positive pressure from a suitable source generates a vacuum pressure when the primary source of vacuum pressure, typically the engine intake manifold, prodcuces insufficient vacuum pressure to operate a device such as a road speed control servomotor. The aspirator assembly is connected to the source of positive pressure and the engine intake manifold as well as to atmosphere and to the device to be operated by vacuum power. When there is sufficient intake manifold vacuum pressure for the desired purpose, there is no flow through the aspirator and the engine intake manifold supplies all of the vacuum needs of the servomotor. When aspirator vacuum pressure is required due to insufficient manifold vacuum pressure, the aspirator is opened to generate aspirated vacuum pressure and the connection between the servomotor and manifold vacuum is closed. The aspirated air is delivered to the engine intake manifold.

Abstract: Vehicle constant speed driving apparatus including a solenoid of a releasing valve for directing atmosphere into a hydraulic actuator when the releasing valve solenoid releases a constant speed driving which is in ON-condition (not causing ON-OFF repeated operation) in order to isolate an interior chamber of the hydraulic actuator from the atmosphere during the constant speed driving, and a modulator valve solenoid located adjacent to a releasing valve solenoid so that both solenoids are held in a substantially same thermal condition.

Abstract: A fluid actuator for electrically detecting the running speed of a vehicle and processing the detected data and an electric control system for driving said actuator are provided, and in the electric control system a delay involved in the response of the fluid actuator to a change of the running speed of the vehicle is compensated for in advance by a filter means to thereby automatically maintain a constant running speed of the vehicle.

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: A motor vehicle speed-control system includes a bellows chamber having a movable wall connected to the engine throttle. The pressure of the gas in the chamber is controlled by two electromagnetic valves, the first electromagnetic valve being energized with electrical pulses to repetitively connect the bellows chamber alternatively to atmosphere and vacuum, and the second electromagnetic valve being spring-biassed so that, when deenergized, it vents the chamber to atmosphere to ensure rapid closure of the throttle, and when energized, closes the said vent. An auxiliary fail-safe brake-pedal valve is provided. An audible signal is produced by a flow of air in the event of malfunctioning of the actuator device.

Abstract: A vehicle speed control system is disclosed where the vehicle speed is automatically controlled by an electro-pneumatic actuator subjected to the controlled application of sub-atmospheric pressure. A dump valve is normally held closed by an energized electrical coil but opens when the coil is de-energized and connects the actuator to atmosphere and shuts off the control system. The coil is connected to an electrical power source through a disabling switch which is intended to be opened automatically when the driver operates the vehicle brakes and thus overrides the control system. To ensure that the override is effective even if the disabling switch fails to open, a brake-pedal operated switch connects one end of the coil to the same terminal of the power supply as is connected to the other end of the coil by the disabling switch. Therefore, when the brakes are operated both sides of the coil receive the same potential and the coil is de-energized even if the disabling switch fails to open.

Abstract: Automobile speed control to maintain actual automobile speed at a desired automobile speed, in which a superposed electrical analog signal formed by a first electrical signal indicating actual automobile speed and a feedback signal indicating fuel injection duration in an engine of an automobile is supplied to a comparator which compares it with a second electrical signal indicating desired automobile speed and memorized on a capacitor. The differential signal or error signal at the output of the comparator circuit is supplied to a servomotor which controls the position or opening of a throttle valve of the engine. The feedback signal is supplied from an injection time signal generator circuit which, in response to a fuel injection command signal from an electronic fuel injection control device associated with the engine, generates an electrical analog signal corresponding to fuel injection duration.

Abstract: A vehicle having an engine with a carburetor supplying fuel and having a variably positionable throttle valve, has vacuum responsive motor means operatively connected to the throttle valve for at times closing the throttle valve so as to govern the maximum speed of the engine associated with the vehicle; a variably positionable vent or valving means controls the amount of ambient air being bled into the vacuum responsive motor means in order to thereby determine when such vacuum responsive motor means will be effective to control the position of the throttle valve; and electronic control and actuating means are effective to sense the speed of the engine and actuate the venting or valving means in response to such sensed speed in order to thereby vary the degree of ambient air bleed.

Abstract: A speed control device for a vehicle driven by an internal combustion engine comprises a longitudinally movable actuator member connected to the accelerator control linkage of the engine, a longitudinally movable abutment member, a device for optionally locking the abutment member against longitudinal movement, a spring and a flexible diaphragm connecting the actuator and abutment members, and means for applying manifold vacuum from the internal combustion engine to the diaphragm whereby to vary the relative positions of the actuator and abutment members. Preferably the device locking the abutment member is controlled by an acceleration responsive device so as to unlock the abutment whenever the vehicle is subjected to more than a predetermined degree of deceleration.