Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Kazushi Kimura

Shigeki Ohtagaki

Kazunori Miura

Takayuki Yamamoto

Chiaki Fujimoto

Yasushi Takemoto

Ryuuji Okamura

Isamu Nagai

A electric power steering control device equipped with a motor having a resolver detection unit includes: an ambient temperature detector for detecting ambient temperature around a portion generating heat by current flow; a motor temperature detector for, based on a signal from the resolver detection unit of the motor, estimating the temperature of the portion generating heat; and an abnormality determiner for comparing the temperature detected by the ambient temperature detector with the temperature detected by the motor temperature detector and determining that the ambient temperature detector is abnormal.

Electric power steering control device

An electric power steering apparatus is provided which can obtain steering auxiliary power when a steering auxiliary power starting condition is not satisfied and there exists no abnormality in a power source and the like. The electric power steering apparatus controls output of a motor in such a way that through operation of a driver, limited steering auxiliary power that is limited to be smaller than normal steering auxiliary power is exerted on a steering system, and exerts limited steering auxiliary power on the steering system when the vehicle is to be saved, even when due to a vehicle failure or a fuel shortage, the engine stops, so that the load on a driver, which is imposed when the vehicle is moved to a safe place, can be reduced.

Electric power steering apparatus

An electric power steering control apparatus can reduce steering torque even in a steering holding state or a slight steering state without providing an unpleasant feeling to a driver. The apparatus includes a torque sensor for detecting steering torque generated by the driver for a vehicle, a motor for generating assist torque to assist the steering torque, a rotational speed detector for detecting the rotational speed of the motor, a torque controller for calculating an assist torque current corresponding to the assist torque based on the steering torque, and a damping control section for calculating a damping current to be added to the assist torque current to suppress vibrations generated in a steering system of the vehicle. The damping controller reduces a damping control gain to calculate the damping current when the rotational speed of the motor is equal to or less than a predetermined speed.

Electric power steering control apparatus

An electric power steering unit includes: a steering mechanism for steering a wheel under the torque of a steering wheel; a motor for adding a steering assist power to the steering mechanism; a controller for controlling current to be conducted through the motor in accordance with a steering state; a storage element for storing a state of the controller; and initial value setting device for causing the storage device to store a state of the controller when IG (ignition switch) is changed to OFF, and for obtaining a process of overheat state of the controller or the motor to set an initial value of a current limit value to the motor when the IG is changed to ON. As a result, not only a load on a battery when IG is OFF is reduced but also the motor is efficiently driven at the start time.

Electric power steering unit

A control apparatus for a motor-driven power steering system of a motor vehicle includes a steering angular information detecting means ( ) for detecting steering angular information of a steering mechanism ( ), a controller ( ) for controlling a motor current on the basis of the steering angular information and magnitude and direction of a steering torque, an electric motor ( ) operatively coupled to the steering mechanism ( ) for generating a steering assist torque (Ta) corresponding to the motor current, the assist torque being applied to a steering wheel, a motor-rotational information detecting means ( ) for detecting rotational information of the electric motor ( ), and an abnormality decision means ( ) designed to make decision that the steering angular information detecting means ( ) is abnormal when a difference between the steering angular information and the motor rotational information is not smaller than a reference value preset for comparison of both the information.

Control apparatus for motor-driven power-steering system of motor vehicle

Disclosed is a power steering system which involves no dedicated equipment, no increase in cost, and no such hardware operation for correction as the mounting of an adjusting resistor. The power steering system includes an external device which outputs an arbitrary torque signal in an error measurement mode, and an electric power steering control device which detects the torque signal, computes the differential between the detected torque value and a reference torque value, stores the differential as a torque correction value, and, in the actual control mode, uses the detected torque value after correcting it by the torque correction value, whereby it is possible to perform reading error correction on a software basis and to expedite and automate the correction.

Growing community of inventors

Hyogo, Japan

Kazushi Kimura