Abstract: A substrate provided in proximity to a case for improving heat radiation, and maintaining electrical insulation between the substrate and the case even when the substrate is warped, in the substrate having electronic parts mounted thereon and a case for housing the substrate. A case body of the case has a substrate placement surface for placing the substrate, the substrate placement surface is provided with a protruding portion protruding therefrom, and the substrate is fixed on the substrate placement surface, via a thermal interface material disposed on the substrate placement surface from a periphery of the protruding portion.

Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.

Abstract: A power-source voltage diagnostic device of an electric power steering apparatus that improves the performance for the anomalous detection of the motor power-source voltage VR-detecting circuit and is capable of continuing the assist control even if the extraordinary state is detected. When the failure (extraordinary state) detection of the VR-detecting circuit is performed by using the correlation between Vbat1-voltage obtained by the detecting section (Vbat1-detecting circuit) to detect the control voltage from the control power-source circuit and VR-voltage obtained by the detecting circuit (VR-detecting circuit) to detect the motor power-source voltage from the power source circuit, multiplexing is performed by providing VR-detecting circuits (VR-detecting circuit 1, VR-detecting circuit 2) of two systems and mutually comparing them so as to accurately perform the failure diagnosis of the VR-detecting circuits.

Abstract: An electronic control unit diagnoses a short failure of an inverter FETs and diagnoses whether the failure of the FET-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage FETs and a lower-stage FETs via an MCU, having: an FET-short detecting section to detect a short failure of the upper-stage FETs and the lower-stage FETs based on respective connection point voltages of the upper-stage FETs and the lower-stage FETs; and a diagnostic function to detect a failure of the FET-short detecting section. The diagnostic function diagnoses the failure of the FET-short detecting section at start up and turns-OFF the upper-stage FETs and the lower-stage FETs when the failure is detected. The FET-short detecting section diagnoses the short failure of the upper-stage FETs and the lower-stage FETs when the failure of the FET-short detecting section is not detected.

Abstract: A power-source voltage diagnostic device of an electric power steering apparatus that improves the performance for the anomalous detection of the motor power-source voltage VR-detecting circuit and is capable of continuing the assist control even if the extraordinary state is detected. When the failure (extraordinary state) detection of the VR-detecting circuit is performed by using the correlation between Vbat1-voltage obtained by the detecting section (Vbat1-detecting circuit) to detect the control voltage from the control power-source circuit and VR-voltage obtained by the detecting circuit (VR-detecting circuit) to detect the motor power-source voltage from the power source circuit, multiplexing is performed by providing VR-detecting circuits (VR-detecting circuit 1, VR-detecting circuit 2) of two systems and mutually comparing them so as to accurately perform the failure diagnosis of the VR-detecting circuits.

Abstract: [Problem] An object of the present invention is to provide a motor control apparatus that, with a high reliability, protects the motor release-switch comprising the semiconductor switching elements in small size and an electric power steering apparatus provided the same.

Abstract: An electric power steering apparatus that calculates a current command value based on at least a steering torque, performs a PWM-control of a brushless motor by an inverter based on the current command value, performs a current control by detecting a rotational angle of the brushless motor, and performs an assist-control of a steering system. The apparatus includes three rotational angle detecting systems to detect three rotational angles of the brushless motor; and an angle diagnosing section that compares absolute values of differences on respective angles outputted from the three rotational angle detecting systems with a threshold, and performs a process by diagnosing whether the rotational angle detecting systems are normal or abnormal; wherein the assist control is continuously performed by using output angles outputted from systems diagnosed as being normal.

Abstract: An inverter device includes a switch circuit configured by series-connecting two N-channel semiconductor switching elements in opposite directions so that the switch circuit makes or breaks electrical connection between a DC power supply and an inverter circuit, and a control circuit carrying out a protecting operation in which when the control circuit outputs a control signal to control switching of the inverter circuit and an operating condition is met, the control circuit stops output of the control signal to turn off all switching elements configuring the inverter circuit and the switch circuit. In the protecting operation, the switch circuit is turned off after output of the control signal has been stopped so that changes in drain-source voltages and drain currents of the N-channel semiconductor switching elements are rendered slower.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that has a 3-shunt control function to perform a 3-shunt PWM-control for raising a reliability of the apparatus and for improving a stability, and a 1-shunt control function to perform a 1-shunt PWM-control so as to continue an assist control when the 3-shunt control function is damaged. [Means for solving the problem] The electric power steering apparatus according to the present invention, having: a 3-shunt control function to perform a 3-shunt PWM-control with a first 3-phase detected current values based on down-stream 3-shunt; a 1-shunt control function to perform a 1-shunt PWM-control with a second 3-phase detected current values based on down-stream 1-shunt; and a switching function to switch from the 3-shunt control function to the 1-shunt function when a failure of current detection circuit system in relation to the first 3-phase detected current values is detected.

Abstract: An electric power steering apparatus that calculates a current command value based on at least a steering torque, performs a PWM-control of a brushless motor by an inverter based on the current command value, performs a current control by detecting a rotational angle of the brushless motor, and performs an assist-control of a steering system. The apparatus includes three rotational angle detecting systems to detect three rotational angles of the brushless motor; and an angle diagnosing section that compares absolute values of differences on respective angles outputted from the three rotational angle detecting systems with a threshold, and performs a process by diagnosing whether the rotational angle detecting systems are normal or abnormal; wherein the assist control is continuously performed by using output angles outputted from systems diagnosed as being normal.

Abstract: An electric power steering apparatus, without outside attachment circuit, that is capable of simultaneously sampling two phases of which the duties are not saturated and of cheaply detecting the 3-shunt currents by using two A/D converting units in correspondence to the duty saturation phase (the maximum phase) changing when the motor is rotated. The apparatus calculates a current command value due to at least a steering torque, performs a PWM-control of a 3-phase motor through an inverter based on the current command value, and assist-controls a steering system of a vehicle by detecting currents of the 3-phase motor and feed-backing.

Abstract: [Problem]_0 An object of the present invention is to provide an electric power steering apparatus that has a 3-shunt control function to perform a 3-shunt PWM-control for raising a reliability of the apparatus and for improving a stability, and a 1-shunt control function to perform a 1-shunt PWM-control so as to continue an assist control when the 3-shunt control function is damaged. [Means for Solving the Problem] The electric power steering apparatus according to the present invention, having: a 3-shunt control function to perform a 3-shunt PWM-control with a first 3-phase detected current values based on down-stream 3-shunt; a 1-shunt control function to perform a 1-shunt PWM-control with a second 3-phase detected current values based on down-stream 1-shunt; and a switching function to switch from the 3-shunt control function to the 1-shunt function when a failure of current detection circuit system in relation to the first 3-phase detected current values is detected.

Abstract: There is provided an in-vehicle electronic control apparatus suitable for enhancing a robust characteristic of a failure diagnosis process performed for a functional part having a function relating to a drive-control of an actuator. A functional part (120) relating to the drive-control of an electric motor (12) includes a main functional part (120a) and an alternative functional part (120b) that is an alternative of the main functional part.

Abstract: An electric power steering apparatus, without outside attachment circuit, that is capable of simultaneously sampling two phases of which the duties are not saturated and of cheaply detecting the 3-shunt currents by using two A/D converting units in correspondence to the duty saturation phase (the maximum phase) changing when the motor is rotated. The apparatus calculates a current command value due to at least a steering torque, performs a PWM-control of a 3-phase motor through an inverter based on the current command value, and assist-controls a steering system of a vehicle by detecting currents of the 3-phase motor and feed-backing.

Abstract: A switch driving circuit electrically opens and closes a switch circuit including two N-channel type semiconductor switching elements series connected in a reverse direction, thereby electrically opening and closing a path between a DC power supply and an inverter circuit. The switch driving circuit has a reference potential point in common with the inverter circuit and supplies an opening/closing control signal to the switch circuit. The switch driving circuit includes a half bridge circuit including two semiconductor switching elements series connected between a driving power supply and the reference potential point. Two protection diodes are connected in parallel to the semiconductor switching elements respectively. At least one current blocking diode is configured to block current from flowing from the reference potential point through the diode to the switch circuit side when the DC power supply is connected to the inverter circuit in reverse polarity.

Abstract: An electric power steering apparatus is provided in which stably performing drive of FETs of an inverter can be achieved by means of a simplified constitution. The electric power steering apparatus drive-controls a motor through an inverter comprised of an FET bridge based on each-phase duty command values of pulse-width modulation (PWM) and perform assist control of a steering system. The electric power steering apparatus comprises a charge pump circuit and a bootstrap circuit that generate a booster power voltage for driving upper-FETs of the FET bridge, wherein the circuit having a higher voltage is used as the booster power voltage.

Abstract: An object of the present invention is to provide an electric power steering apparatus capable of stably performing drive of FETs of an inverter by means of a simplified constitution and control. [Means For Solving The Problem] An electric power steering apparatus that drive-controls a motor by an inverter comprised of an FET bridge based on each-phase duty command values of PWM and performs assist control of a steering system, comprises a charge pump circuit and a bootstrap circuit that generate a booster power voltage for driving upper-FETs of the FET bridge, wherein a voltage of one having a high voltage of the charge pump circuit and the bootstrap circuit is used as the booster power voltage.

Abstract: There is provided an in-vehicle electronic control apparatus suitable for enhancing a robust characteristic of a failure diagnosis process performed for a functional part having a function relating to a drive-control of an actuator. A functional part (120) relating to the drive-control of an electric motor (12) includes a main functional part (120a) and an alternative functional part (120b) that is an alternative of the main functional part.

Abstract: An inverter device includes a switch circuit configured by series-connecting two N-channel semiconductor switching elements in opposite directions so that the switch circuit makes or breaks electrical connection between a DC power supply and an inverter circuit and a control circuit carrying out a protecting operation in which when the control circuit output a control signal to control switching of the inverter circuit and an operating condition is met, the control circuit stops output of the control signal to turn off all switching elements configuring the inverter circuit and the switch circuit. In the protecting operation, the switch circuit is turned off after output of the control signal has been stopped.

Abstract: The invention provides a valve which suppresses a continuous corrosion of a chemical compound phase such as an eutectic carbide or the like in a valve seat, and improves a corrosion resistance, an impact resistance and an erosion resistance of the valve seat. The invention disperses a chemical compound phase such as the eutectic carbide or the like crystallizing in a dendrite gap as a granular shape or a blocky shape which is equal to or less than about 100 ?m, by moving a tool rotating in a crimped state by a load application to a vertical direction to a surface of the valve seat so as to carry out a friction stir processing, and forming a weld metallographic structure of a surface layer portion of the valve seat as a cubic.