Abstract: A valve controller includes a detector detecting a shutdown command signal to shutdown an engine, a driving circuit for driving a motor, and a power source controller. The power source controller turns on the driving circuit until the predetermined period has passed since the shutdown command signal is detected. Thus, the valve controller adjusts the valve opening/closing character in such a manner as to be suitable to an engine condition.

Abstract: A stator having a stator core about which a coil is wound is secured to an aluminum frame. A magnet-embedded type rotor is rotatably accommodated inward of the stator. A circuit substrate is attached to the surface of the aluminum frame opposite to the surface to which the stator is secured. A control circuit and hall ICs for detecting the rotational position of the rotor are mounted on the circuit substrate. Detection signals of the hall ICs are received by the control circuit. The control circuit supplies a drive current to the coil of the stator in accordance with the detection signals.

Abstract: The valve timing controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit receives a control signal generated by the control circuit and an engine rotation speed signal. The driving circuit supply a current to the motor to drive it based on the engine rotation speed represented by engine rotation speed signal and a target variation of the motor rotation speed represented by the control signal.

Abstract: The invention provides a valve controller of a motor utilizing type for improving control accuracy and reducing cost. The valve controller controls valve opening and closing of an engine by utilizing rotation torque of the motor, and has a driving circuit receiving a control signal generated by a control circuit, and applying an electric current to the motor and driving the motor on the basis of a target rotation number of the motor shown by this control signal using a frequency, and a target rotating direction of the motor shown by this control signal using a duty ratio.

Abstract: The valve controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit drives a motor based on a control signal generated by the control circuit and a rotational position signal generated by a rotational position sensor. The driving circuit generates a rotation number signal representing an actual rotation number of the motor according to the rotational position signal, and transfers the rotation number signal to the control circuit.

Abstract: A valve timing controller of a motor utilizing type has a control circuit for generating a control signal, and a driving circuit for turning-on and driving the motor in accordance with the control signal generated by the control circuit. The control circuit for receiving a motor rotation signal showing the real rotation speed of the motor, and an engine speed signal showing the real rotation speed of the engine generates the control signal on the basis of the motor rotation signal when the real rotation speed of the engine is less than a reference value. The control circuit also generates the control signal on the basis of the engine speed signal when the real rotation speed of the engine becomes the reference value or more.

Abstract: A valve timing controller of a motor utilizing type has a control circuit for generating a control signal, and a driving circuit for turning-on and driving the motor in accordance with the control signal generated by the control circuit. The control circuit for receiving a motor rotation signal showing the real rotation speed of the motor, and an engine speed signal showing the real rotation speed of the engine generates the control signal on the basis of the motor rotation signal when the real rotation speed of the engine is less than a reference value. The control circuit also generates the control signal on the basis of the engine speed signal when the real rotation speed of the engine becomes the reference value or more.

Abstract: A valve controller includes a detector detecting a shutdown command signal to shutdown an engine, a driving circuit for driving a motor, and a power source controller. The power source controller turns on the driving circuit until the predetermined period has passed since the shutdown command signal is detected. Thus, the valve controller adjusts the valve opening/closing character in such a manner as to be suitable to an engine condition.

Abstract: A valve opening and closing control device of a type making use of a motor enhances driving performance of the motor and restricts heat generated by constituent elements. A bridge circuit of a motor driving circuit comprises three rows of arms comprising two switching elements connected in series to each other and two diodes connected in parallel to corresponding switching elements. The respective arms are connected in parallel to an electric source, and motor windings are connected to points of interconnection of the switching elements on the respective arms. After putting the respective switching elements of the arms in an ON state to carry an electric current to the windings, a control circuit causes the switching element in an ON state to be put as an electricity introduction stoppage element in an OFF state and causes the switching element of the same arm as that, on which the electricity introduction stoppage element is disposed, to be put in an ON state.

Abstract: A valve timing controller is driven by a motor and has a control circuit and a driving circuit. The driving circuit drives the motor according to a target rotation speed which is represented by a control signal frequency generated by the control circuit. Accordingly as the frequency becomes higher, the target rotation speed increases. When the frequency of the control signal is either lower than or equal to a first threshold frequency, or higher than or equal to a second threshold, the first threshold frequency being greater than zero and being greater than the second threshold frequency, the driving circuit stops supplying current to the motor.

Abstract: A stator having a stator core about which a coil is wound is secured to an aluminum frame. A magnet-embedded type rotor is rotatably accommodated inward of the stator. A circuit substrate is attached to the surface of the aluminum frame opposite to the surface to which the stator is secured. A control circuit and hall ICs for detecting the rotational position of the rotor are mounted on the circuit substrate. Detection signals of the hall ICs are received by the control circuit. The control circuit supplies a drive current to the coil of the stator in accordance with the detection signals.

Abstract: The invention provides a valve controller of a motor utilizing type for improving control accuracy and reducing cost. The valve controller controls valve opening and closing of an engine by utilizing rotation torque of the motor, and has a driving circuit receiving a control signal generated by a control circuit, and applying an electric current to the motor and driving the motor on the basis of a target rotation number of the motor shown by this control signal using a frequency, and a target rotating direction of the motor shown by this control signal using a duty ratio.

Abstract: The valve timing controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit receives a control signal generated by the control circuit and an engine rotation speed signal. The driving circuit supply a current to the motor to drive it based on the engine rotation speed represented by engine rotation speed signal and a target variation of the motor rotation speed represented by the control signal.

Abstract: The valve timing controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit drives a motor according to a target rotation speed of the motor which is represented by a frequency of a control signal which I generated by the control circuit. According as the frequency becomes higher, the target rotation speed increases. When the frequency of the control signal is either lower than or equal to a first threshold frequency, or higher than or equal to a second threshold, the first threshold frequency being greater than zero and being greater than the second one, the driving circuit stops supplying a current to the motor.

Abstract: The valve controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit drives a motor based on a control signal generated by the control circuit and a rotational position signal generated by a rotational position sensor. The driving circuit generates a rotation number signal representing an actual rotation number of the motor according to the rotational position signal, and transfers the rotation number signal to the control circuit.

Abstract: There is provided a valve opening and closing control device (10, 110, 210, 300, 410) of a type making use of a motor (12, 320), in which device the driving performance of the motor is enhanced and heat generated by constituent elements is restricted. A bridge circuit (110, 212, 382, 411) of a motor driving circuit (100, 200, 370, 400) comprises three rows of arms (113u, 113v, 113w) comprising two switching elements (111a, 111b) connected in series to each other and two diodes (112a, 112b) connected in parallel to corresponding switching elements. The respective arms are connected in parallel to an electric source (120, 213, 383, 412), and motor windings (22u, 22w, 22v) are connected to points of interconnection of the switching elements on the respective arms.

Abstract: The variable valve timing controller controls the valve timing of the intake valve. The variable valve timing controller has a shaft, the stator fixed on the engine and generating the magnetic field around the shaft and rotational phase converter converting the torque applied to the shaft. When the valve timing is in the most delayed timing, the engine can be started. The rotational phase of this timing is called the feasible phase. When the stator stops generating the magnetic field, the load torque arise on the shaft. The rotational phase converter varies the rotational phase into the feasible phase with receiving the load torque from the shaft.

Abstract: The variable valve timing controller controls the valve timing of the intake valve. The variable valve timing controller has a shaft, the stator fixed on the engine and generating the magnetic field around the shaft and rotational phase converter converting the torque applied to the shaft. When the valve timing is in the most delayed timing, the engine can be started. The rotational phase of this timing is called the feasible phase. When the stator stops generating the magnetic field, the load torque arise on the shaft. The rotational phase converter varies the rotational phase into the feasible phase with receiving the load torque from the shaft.

Abstract: An ignition system for internal combustion engines comprises means for generating an ignition signal in synchronism with the revolution of an internal combustion engine and an ignition circuit device for interrupting a primary current of an ignition coil in accordance with the ignition signal. The ignition circuit device includes an ignition monitor signal producing circuit for producing an ignition monitor signal which circuit operates to set the ignition monitor signal at the time of starting the energization of the ignition coil and thereafter to reset the ignition monitor signal at a subsequent predetermined timing, whereby the ignition circuit device operates, in accordance with the pulse width and the set and reset conditions of the ignition monitor signal, to decide whether the operation of the ignition circuit device is normal or abnormal, to control to generate a predetermined amount of ignition energy, and to prevent erroneous generation the ignition monitor signal due to a noise or the like.