VEHICLE STEERING DEVICE

摘要

A vehicle steering device (11) is provided that performs steering of a vehicle in response to operation of a steering wheel (13) operated when the traveling direction of the vehicle is changed. The vehicle steering device (11) includes a first steering assist device having a first steering torque sensor (23), a first assist motor (51), and a first EPS control unit (37), and a second steering assist device having a second steering torque sensor (25), a second assist motor (57), and a second EPS control unit (39). The first and second EPS control units (37, 39) perform driving control of the first and second assist motors (51, 57) independently from each other. Even if either one of the two control units (37, 39) respectively controlling driving of the two assist motors (51, 57) fails into an abnormal situation, such an abnormal situation can be brought under control quickly and soundly.

主权项

1. A vehicle steering device inclusive of a steering member to be operated to change the traveling direction of a vehicle for performing steering of the vehicle in response to operation of the steering member, comprising:
a first steering assist device having at least a first steering torque sensor, a first assist motor that applies an assist force for steering to the steering member, and a first control unit; and a second steering assist device having at least a second steering torque sensor, a second assist motor that applies an assist force for steering to the steering member, and a second control unit, wherein the first and second assist motors are mutually coupled via a steering force transmission mechanism, the first and second steering torque sensors are arranged between one of the first and second assist motors, which is located near the steering member, and the steering member, the first control unit performs driving control of the first assist motor so as to apply an assist force at least based on a first steering torque detected by the first steering torque sensor, and the second control unit performs driving control of the second assist motor so as to apply an assist force at least based on a second steering torque detected by the second steering torque sensor, wherein the first and second control units perform the driving control independently from each other.