Honda Motor Co., Ltd.

Kazuhiko Inaba

Norio Yamazaki

Satoshi Kawabe

Kouji Nakamura

Junichi Seto

Shigenobu Sekiya

Masanori Takagi

Masaya Kusatani

Yuichi Shimada

Tomohiro Morikami

Toshiharu Akashi

Akio Ueno

Taku Natsume

An electronic power steering apparatus for a vehicle having a steering mechanism to generate a steering assisting force includes: a steering angle sensor; a steering torque sensor; a target steering torque setting unit for setting a target steering torque based on the detected steering angle; a torque deviation computing unit for computing a torque deviation between the target steering torque and the detected steering torque; a first target current value computing unit for computing a first target current value for generating a steering assisting force by the motor based on the computed torque deviation; and a vehicle speed sensitivity adjusting unit that adjusts the first target current value, at least corresponding to a detected vehicle speed, and outputs the adjusted first current value as a second target current value. The motor control unit controls the motor to generate the steering assisting force based on the second target current value.

Electronic power steering apparatus

Provided is an electric power steering system that prevents the oscillation of the steering wheel at each steering stroke end. If the steering stroke end flag Fse is 1 or if the determination result is Yes in step S, the EPS-ECU () determines if the right steering flag (Fdrc) is 1 in step S. If the determination result is Yes, it is then determined if the steering torque difference base value (Dtsb) is positive in step S. If the determination result of step Sis Yes, the EPS-ECU () uses the steering torque difference base value (Dtsb) as the steering torque difference (Dts) in step S. If the determination result is No, the steering torque difference (Dts) is given by a value 0 in step S, and the control process is concluded.

Electric power steering system

Growing community of inventors

Saitama, Japan

Kazuhiko Inaba