Control apparatus for motor-driven power steering system in whic

Details Control apparatus for motor-driven power steering system in whic Control apparatus for motor-driven power steering system in whic

1994-10-13

1997-02-11

Park, Collin W.

Boots, shoes, and leggings

180446, B62D 504

Patent

active

056027354

ABSTRACT:
A control apparatus for a motor-driven power steering system of a motor vehicle for preventing generation of actuation noise of a clutch without sacrificing reliability of the steering system. A current calculating/driving means 91 calculates a motor current command value I.sub.0 on the basis of a vehicle speed V and a steering torque T for driving a motor 13. An abnormal torque decision reference value arithmetic means 901 calculates an abnormal torque decision reference value T.sub.0 and a reference time t.sub.0 in dependence on the vehicle speed V, while a load torque calculating means 902 calculates a load torque T.sub.L on the basis of the steering torque T and the motor current command value I.sub.0. A motor rotation decision means 907 estimates a rotation number N.sub.M of the motor 13 from a motor regeneration voltage. When the load torque T.sub.L is greater than the abnormal torque decision reference value T.sub.0 and when a duration t.sub.L thereof is greater than the reference time t.sub.0, power supply to the motor 13 is interrupted under the control of a motor fault monitor/control means 904, provided that the rotation number N.sub.M is not greater than a motor stop decision reference rotation number N.sub.0. A clutch control means 92B is also so controlled that the steering torque T becomes equal to a preset torque limitation triggering value T.sub.1 so that the steering can be performed without encountering any appreciable obstacle.

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Patent Abstract of Japan vol. 017 No. 569, Jun. 29, 1993, JPA-05-162647.
Patent Abstract of Japan vol. 015 No. 329, May 29, 1991, JPA-3-125667.

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