| 摘要 |
PCT No. PCT/JP88/00238 Sec. 371 Date Oct. 31, 1988 Sec. 102(e) Date Oct. 31, 1988 PCT Filed Mar. 4, 1988 PCT Pub. No. WO88/06546 PCT Pub. Date Sep. 7, 1988A motor-driven power steering system for a vehicle and a method for controlling the same in which the assisting torque of a motor is transmitted through a clutch toward steerable road wheels of the vehicle for power assisting the steering motion imparted to a steering wheel by an operator. It is possible to precisely judge whether there exists a failure in the operation of the motor and/or the clutch before the clutch is connected. To this end, a certain characteristic value of the motor under no load condition is measured with the clutch disconnected, and then compared with a preset comparison value such as a reference motor current to determine whether the motor is mechanically restricted. If not, the clutch is connected. If so, the clutch is kept not connected so that an appropriate failsafe operation can be performed.
|
