Abstract: An automatic car-speed controller is provided with a car-speed sensor, a command switch, a car-speed memory, an actuator, a control circuit for controlling the actuator, and a prohibition circuit for preventing a driving motor of the actuator to rotate in the accelerating direction at the time of cancelling car-speed control or occurrence of some abnormality in the control circuit or the like, or a discrimination circuit for detecting whether a first limit switch is normal or not without driving a throttle in the opening direction.

Abstract: An automatic vehicle speed control device for use in an automatic controlling of the running speed of a vehicle to a certain set speed is disclosed.

Abstract: An automatic car-speed controller is provided with a car-speed sensor, a command switch, a car-speed memory, an actuator, a control mechanism, and a holding circuit for cutting off an electric current to the actuator according to a braking operation and maintaining the actuator in its nonworking state till the actuator returns to its working state in response to a cruise command signal from the command switch in addition to the control mechanism. According to this controller, it is possible to release the actuator rapidly from the automatic car-speed controlling state in response to the braking operation even if the trouble occurs in the control mechanism.

Abstract: A car-speed control system is provided with a car-speed sensor, a command switch, an actuator having an electromagnetic clutch, an actuator-driving circuit, a clutch-driving circuit, a car-speed memory, a controller and a comparing circuit for comparing voltage level with reference voltage at the time of changing the electromagnetic clutch to its unexcited state and for changing the actuator-driving circuit to its non-driving state if the voltage level of the clutch-driving means is higher than the exciting voltage of the electromagnetic clutch.

Abstract: An automatic car-speed controller is provided with a car-speed sensor, a command switch, a car-speed memory, an actuator, a driving motor, an abnormality detector for detecting an abnormality in an electromagnetic clutch of the actuator by detecting the time required for returning a throttle to the fully closed position from the position at which the electromagnetic clutch is released, and a control system for making the actuator inoperative when the abnormality detector detects an abnormality in the electromagnetic clutch.

Abstract: A motor driving device for rotating a motor in forward and reverse directions which includes a switching circuit arranged in an H-bridge connection with both terminals of the motor, a controlling circuit, and an interception device provided on the respective terminal sides of the motor. The switching circuit includes two sets of switching transistors. The interception device protects the switching circuit by preventing both transistor sets from entering the ON-state at the same time, and thereby prevent the switching means from breaking down.

Abstract: A motor driving device is provided with switches connected with both terminals of a motor in an H-bridge connection and malfunction detectors connected with both terminals of said motor. The malfunction detectors are comprised of an impression part and a detection part which can detect the breakdown of the respective switches caused by open breakage or short breakage according to an output signal from the detection part corresponding to an input signal from the impression part.

Abstract: A system and method for automatically controlling a vehicle speed to a desired cruising speed are disclosed in which an abrupt deceleration time for which the vehicle is abruptly decelerated to the vehicle speed at a time when an off operation of an acceleration switch in a cruise command switch group is carried out after an on operation of the acceleration switch to carry out a constant deceleration of the vehicle is calculated from the total duration of time for which the actuator is controlled so that the vehicle speed increases at a constant rate. Therefore, no need to adjust the abrupt deceleration time according to the individual vehicles in which the systems are mounted. In addition, since the actuator is rendered in the abrupt deceleration state within the appropriate duration of time, road conditions, or a speed range in which the vehicle cruises does not affect the performance of the system.

Abstract: A driving device for a door lock-actuator includes a door locking switch, a control circuit, a drive device and a counter. This device is free from the malfunctions and the restrictions of detecting limits which are problems in conventional-mechanical one-way switches, and can detect the locking and unlocking action certainly. In this device, the control circuit detects the locking and unlocking direction, and the drive device can drive the door lock-actuator of all the doors adjacent a passenger's seat according to the output signal from the control circuit.

Abstract: A system and method for automatically controlling a cruising speed of a vehicle which can maintain a vehicle speed at a desired cruising speed is disclosed in which a plurality of initialization signal values are set after an accelerator switch installed in a command switch is initially operated and thereafter is released and again operated to command a desired acceleration of the vehicle irrespective of the type of vehicle using the system, i.e., according to the vehicle speed. Second and third initialization signal values have predetermined functional relationships to a first initialization signal value which is set when the accelerator switch is initially operated. These signal values are, e.g., time widths for which a vacuum supply valve of a throttle valve actuator is opened so that an engine throttle valve is opened to increase the vehicle speed.

Abstract: A system and method for automatically controlling a vehicle speed to a desired cruising speed in which a transfer point at which control of the vehicle speed is transferred from that carried out by returning the vehicle speed to the cruising speed set through an operation of a set switch at a controllable acceleration in the vehicle speed to that carried out by controlling the vehicle speed so that the vehicle speed coincides with the set cruising speed is determined on the basis of a sum of an acceleration value multiplied by a constant and speed difference from the actual vehicle speed to set cruising speed. Consequently, an overshooting of the vehicle speed does not occur when the vehicle speed is returned toward and finally settles at the set cruising speed.

Abstract: An automatic speed control device for a vehicle or a stationary generator for emergency use is disclosed.