Abstract: An electric motor control apparatus that can quickly and accurately locate a short-circuit fault point. The electric motor control apparatus includes: a current controller determining respective phase voltage commands according to currents flowing in respective phases of an electric motor and a torque current command; a switching element drive circuit instructing, based on the respective phase voltage commands, an inverter to perform a switching operation; the inverter receiving a switching operation signal to drive the electric motor; current detectors disposed in series with the switching elements in the respective phases of the inverter; and a short-circuit point locating mechanism storing a test pattern indicative of a predetermined combination for turning on the switching elements of the inverter, and locating a short-circuit fault point based on the test pattern and current detection values in the respective phases detected by the current detectors in response to the test pattern.

Abstract: A control apparatus for a multiphase AC electric motor having an inverter includes a current control including an abnormal-state current controller; an abnormal-state detector that detects an abnormal state of any of a wire of an electric motor, a wire of an inverter, and a wire connecting the electric motor to the inverter as an abnormal phase; and an abnormal phase disconnect. The abnormal phase disconnect disconnects one or more of phases detected to be in an abnormal-state and the abnormal-state current controller generates an abnormal state voltage command in accordance with detection of an abnormal state, and uses phases other than the disconnected phases of the inverter to control individual currents of the phases, with the abnormal-state voltage command used as a multiphase voltage command.

Abstract: An electric power steering apparatus in which, when an abnormality is generated in an electric power steering apparatus, an assist is reduced smaller than normal when a steering burden is estimated to be small; and the assist can be increased to normal and the steering burden can be sufficiently reduced when the steering burden is estimated to be large. When an abnormality is detected, an assist command is set smaller than at a normal time when there is no abnormality in a first range where the steering burden estimated by the steering burden estimation unit is small; the assist command is increased to that at a normal time in a second range where the steering burden estimated by the steering burden estimation unit is larger than the first range; and an assist torque of a motor is controlled in response to the assist command at the abnormal time.

Abstract: An electric motor control apparatus that can quickly and accurately locate a short-circuit fault point. The electric motor control apparatus includes: a current controller determining respective phase voltage commands according to currents flowing in respective phases of an electric motor and a torque current command; a switching element drive circuit instructing, based on the respective phase voltage commands, an inverter to perform a switching operation; the inverter receiving a switching operation signal to drive the electric motor; current detectors disposed in series with the switching elements in the respective phases of the inverter; and a short-circuit point locating mechanism storing a test pattern indicative of a predetermined combination for turning on the switching elements of the inverter, and locating a short-circuit fault point based on the test pattern and current detection values in the respective phases detected by the current detectors in response to the test pattern.

Abstract: An electric power steering apparatus in which, when an abnormality is generated in an electric power steering apparatus, an assist is reduced smaller than normal when a steering burden is estimated to be small; and the assist can be increased to normal and the steering burden can be sufficiently reduced when the steering burden is estimated to be large. When an abnormality is detected, an assist command is set smaller than at a normal time when there is no abnormality in a first range where the steering burden estimated by the steering burden estimation unit is small; the assist command is increased to that at a normal time in a second range where the steering burden estimated by the steering burden estimation unit is larger than the first range; and an assist torque of a motor is controlled in response to the assist command at the abnormal time.

Abstract: A control apparatus for a multiphase AC electric motor having an inverter includes a current control including an abnormal-state current controller; an abnormal-state detector that detects an abnormal state of any of a wire of an electric motor, a wire of an inverter, and a wire connecting the electric motor to the inverter as an abnormal phase; and an abnormal phase disconnect. The abnormal phase disconnect disconnects one or more of phases detected to be in an abnormal-state and the abnormal-state current controller generates an abnormal state voltage command in accordance with detection of an abnormal state, and uses phases other than the disconnected phases of the inverter to control individual currents of the phases, with the abnormal-state voltage command used as a multiphase voltage command.

Abstract: A control apparatus for an electric motor, in which a current controller giving multiphase voltage commands to a drive circuit for an inverter includes a normal-mode current controller for use in a normal mode, an abnormal-mode current controller for use in an abnormal mode, and an abnormality decision device. In a case of an abnormality occurring to one phase of an electric motor or the inverter, the controller is altered, and the abnormal-mode multiphase voltage commands which are generated by the abnormal-mode current controller are set as the multiphase voltage commands for the inverter drive circuit.

Abstract: A control apparatus for an electric motor, in which a current controller giving multiphase voltage commands to a drive circuit for an inverter includes a normal-mode current controller for use in a normal mode, an abnormal-mode current controller for use in an abnormal mode, and an abnormality decision device. In a case of an abnormality occurring to one phase of an electric motor or the inverter, the controller is altered, and the abnormal-mode multiphase voltage commands which are generated by the abnormal-mode current controller are set as the multiphase voltage commands for the inverter drive circuit.

Abstract: A motor-driven power steering control apparatus assuring consistently comfortable steering operation of a motor vehicle includes a steering state detecting (10), a motor drive command value arithmetic device (20), a trouble detector (40), a motor drive command value corrector (51, 52) for decrementing a motor drive command value outputted from the motor drive command value corrector (51) from a predetermined initial value as a function of time lapse when a trouble detection signal is outputted from the trouble detector (40), and an element (30) for driving an assist motor in conformance with the output of the motor drive command value corrector (51, 52). The motor drive command value corrector (51, 52) includes a low-pass filter (515) for smoothing the motor drive command value. A value acquired through the low-pass filter (515) is employed as the predetermined initial value.

Abstract: A motor-driven power steering control apparatus assuring consistently comfortable steering operation of a motor vehicle includes a steering state detector (10), a motor drive command value arithmetic device (20), a trouble detector (40), a motor drive command value corrector (51, 52) for decrementing a motor drive command value outputted from the motor drive command value corrector (51) from a predetermined initial value as a function of time lapse when a trouble detection signal is outputted from the trouble detector (40), and an element (30) for driving an assist motor in conformance with the output of the motor drive command value corrector (51, 52). The motor drive command value corrector (51, 52) includes a low-pass filter (515) for smoothing the motor drive command value. A value acquired through the low-pass filter (515) is employed as the predetermined initial value.

Abstract: A motor-driven power steering control apparatus assuring consistently comfortable steering operation of a motor vehicle includes a steering state detecting means (10), a motor drive command value arithmetic means (20), a trouble detecting means (40), a motor drive command value correcting means (51, 52) for decrementing a motor drive command value outputted from the motor drive command value correcting means (51) from a predetermined initial value as a function of time lapse when a trouble detection signal is outputted from the trouble detecting means (40), and a means (30) for driving an assist motor in conformance with the output of the motor drive command value correcting means (51, 52). The motor drive command value correcting means (51, 52) includes a low-pass filter (515) for smoothing the motor drive command value. A value acquired through the low-pass filter (515) is employed as the predetermined initial value.

Abstract: A motor-driven power steering control apparatus assuring consistently comfortable steering operation of a motor vehicle includes a steering state detecting means (10), a motor drive command value arithmetic means (20), a trouble detecting means (40), a motor drive command value correcting means (51, 52) for decrementing a motor drive command value outputted from the motor drive command value correcting means (51) from a predetermined initial value as a function of time lapse when a trouble detection signal is outputted from the trouble detecting means (40), and a means (30) for driving an assist motor in conformance with the output of the motor drive command value correcting means (51, 52). The motor drive command value correcting means (51, 52) includes a low-pass filter (515) for smoothing the motor drive command value. A value acquired through the low-pass filter (515) is employed as the predetermined initial value.

Abstract: A road surface reaction torque detector has a low-pass filter element whose time constant is determined in accordance with a vehicle speed that is detected by a vehicle steed detector and a motor rotation speed that is detected by a motor rotation speed detector. A road surface reaction torque estimation value is obtained in such a manner that the road surface reaction torque detector performs low-pass filter processing on steering shaft reaction torque signal that is outputted by a steering shaft reaction torque signal outputting means. As a result, an accuracy of estimation of road surface reaction torque is improved.

Abstract: A road surface reaction torque detector has a low-pass filter element whose time constant is determined in accordance with a vehicle speed that is detected by a vehicle steed detector and a motor rotation speed that is detected by a motor rotation speed detector. A road surface reaction torque estimation value is obtained in such a manner that the road surface reaction torque detector performs low-pass filter processing on steering shaft reaction torque signal that is outputted by a steering shaft reaction torque signal outputting means. As a result, an accuracy of estimation of road surface reaction torque is improved.

Abstract: An electric motor controller for a steering device that can apply an appropriate steering force to a steering wheel according to running conditions. An electric power steering controller of the present invention includes a steering shaft reaction force torque sensor for detecting a reaction force torque of a steering system, a superimposed reaction force torque calculating unit for multiplying a steering angle detected by the steering angle sensor by a gain to calculate a superimposed reaction force torque in the return direction of the steering wheel, and a control unit for controlling the gain so that the superimposed reaction force torque is reduced when a reaction force torque of the steering system is increased and the superimposed reaction force torque is increased when a reaction force torque of the steering system is decreased.

Abstract: An electric power steering control device is provided, which comprises a vehicle speed detector, a steering torque detector, a steering shaft reaction torque meter, a motor speed detector, a motor acceleration detector, a steering torque detector for calculating a base target current, a damping compensator for finding a gain of a damping torque based on a steering shaft reaction torque to calculate a damping compensation amount based on the damping torque gain and motor speed, an inertia compensator for finding a gain of an inertia compensation torque based on the steering shaft reaction torque to calculate an inertia compensation amount based on the inertia compensation torque gain and motor acceleration, and an adder for compensating a base target current by a damping compensation amount and an inertia compensation amount to calculate a target current.

Abstract: An electric motor controller for a steering device that can apply an appropriate steering force to a steering wheel according to running conditions. An electric power steering controller of the present invention includes a steering shaft reaction force torque sensor for detecting a reaction force torque of a steering system, a superimposed reaction force torque calculating unit for multiplying a steering angle detected by the steering angle sensor by a gain to calculate a superimposed reaction force torque in the return direction of the steering wheel, and a control unit for controlling the gain so that the superimposed reaction force torque is reduced when a reaction force torque of the steering system is increased and the superimposed reaction force torque is increased when a reaction force torque of the steering system is decreased.

Abstract: There is provided an electric motor controller for a steering device that can give an appropriate steering force to a steering wheel according to running conditions. An electric power steering controller of the present invention is provided with a steering shaft reaction force torque sensor for detecting a reaction force torque of a steering system, a superimposed reaction force torque calculating unit for multiplying a steering angle detected by the steering angle sensor by a gain-to calculate a superimposed reaction force torque in the return direction of a steering wheel and a control unit for controlling the gain such that the superimposed reaction force torque is reduced when a reaction force torque of the steering system is large and the superimposed reaction force torque is increased when a reaction force torque of the steering system is small.

Abstract: The present invention is an electric power steering apparatus which includes a multi-phase motor that assists steering effort of a driver, a motor drive circuit provided with at least an upper switching element that connects or disconnects the winding of each phase of the multi-phase motor and a power supply, and a lower switching element that connects or disconnects the winding of each phase of the multi-phase motor and grounding, a logic circuit that determines ON/OFF of the upper switching element and the lower switching element, and first and second microcontrollers that control the motor drive circuit via this logic circuit, in which the logic circuit determines ON/OFF of the upper switching element and the lower switching element so that the power to the winding of the each phase of the multi-phase motor is stopped according to the instruction of either the first microcontroller or the second microcontroller.

Abstract: An electric power steering control device is provided, which comprises a vehicle speed detector, a steering torque detector, a steering shaft reaction torque meter, a motor speed detector, a motor acceleration detector, a steering torque detector for calculating a base target current, a damping compensator for finding a gain of a damping torque based on a steering shaft reaction torque to calculate a damping compensation amount based on the damping torque gain and motor speed, an inertia compensator for finding a gain of an inertia compensation torque based on the steering shaft reaction torque to calculate an inertia compensation amount based on the inertia compensation torque gain and motor acceleration, and an adder for compensating a base target current by a damping compensation amount and an inertia compensation amount to calculate a target current.