Abstract: An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setter of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setter includes a gain setter which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.

Abstract: Provided are a motor control device (1) for controlling a motor (2) having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (Vb) is equal to or higher than a predetermined voltage (Vthr), a motor rotation speed (?) is equal to or lower than a predetermined speed (?thr), a target x-phase voltage command (Vx*) is not in the vicinity of zero, a current (Ix) of the target x-phase is equal to or lower than a predetermined current (Iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined.

Abstract: An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setting means of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setting means includes a gain setting means 12 which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.

Abstract: Provided are a motor control device (1) for controlling a motor (2) having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (Vb) is equal to or higher than a predetermined voltage (Vthr), a motor rotation speed (?) is equal to or lower than a predetermined speed (?thr), a target x-phase voltage command (Vx*) is not in the vicinity of zero, a current (Ix) of the target x-phase is equal to or lower than a predetermined current (Iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined.

Abstract: In the conventional electric power steering control system, a gain by which an approximate differentiation value of a torque signal is multiplied comes to be large at high speed driving. Therefore, a problem exits in that unstable feel of steering increases, thereby steering convergence getting worse. An electric power steering control system includes a variable type torque differential operation device 104A that makes variable a differential time constant at the time of outputting a second motor current, and a time constant determining device 105X that commands the time constant to the variable type torque differential operation device 104A. The time constant determining device 105X determines the time constant in response to any change in not less than one signal selected and used in an arbitrary manner out of a speed signal 81, a torque signal 82, a yaw rate signal 83 and a steering rate signal 84.

Abstract: In the conventional electric power steering control system, a gain by which an approximate differentiation value of a torque signal is multiplied comes to be large at the time of high speed travelling. Therefore upon conducting a quick steering for a lane change or avoidance of danger, a problem exits in that unstable feel of steering increases thereby steering convergence of vehicle getting worse. In the invention, there are provided a variable type torque differential operation device 104A that makes variable a differential time constant at the time of outputting a second motor current, and a time constant determining device 105X that commands the time constant to the variable type torque differential operation device 104A. The time constant determining device 105X determines the time constant in response to any change in not less than one signal selected and used in an arbitrary manner out of a vehicle speed signal 81, a steering torque signal 82, a yaw rate signal 83 and a steering rate signal 84.

Abstract: A throttle control system capable of ensuring and maintaining a minimum function of driving a motor vehicle by engine power with safety. A malfunction detection section detects a malfunction of at least one of first and second accelerator sensors and an accelerator switch on the basis of first and second accelerator operation amount signals and an accelerator switch output signal. A throttle opening control section forms a throttle control signal according to the first accelerator operation amount signal when the accelerator sensors are operating normally, and forms the throttle control signal on the basis of the accelerator output signal when a malfunction of the first or second accelerator sensor is detected.

Abstract: In a suspension control system, a constant speed travel control device controls throttle control unit according to information from a control switch unit and a vehicle speed sensor, to control the vehicle speed, and, when necessary, applies an over-drive off signal to an automatic speed changer, and a suspension control device detects acceleration of the vehicle from the outputs of the vehicle speed sensor and a throttle opening sensor, to calculate a most suitable damping force of a suspension, and receives control state data through a transmission line from the constant speed travel control device, to determine a most suitable damping force to control damping force switching unit. Thereby, comfortableness in the driving vehicle is improved.