Title:
METHOD OF OPERATING ELECTRIC TYPE POWER STEERING SYSTEM
Document Type and Number:
Japanese Patent JPS6099767
Kind Code:
A
Abstract:
A torque transducer (40) senses the operator exerted steering torque and provides an output signal which varies in magnitude from a low value representative of a large operator exerted steering torque in one direction through a mean value representative of no operator exerted steering torque to an upper limit value representative of a large operator exerted steering torque in the opposite direction. A controller (36) develops a zero torque reference which has an initial value substantially corresponding to the mean value of the torque transducer output signal, and steering torque assist is developed in relation to the difference between the zero torque reference and the transducer output signal, the controller actuating an electric motor (32) accordingly. In operation, the zero torque reference is shifted according to a predetermined time response characteristic in a direction to reduce the difference between it and the transducer output signal. Over a period of time, the shifting of the zero torque difference due to operator exerted steering torque tends to cancel out and the remaining shifting adaptively compensates the zero torque reference for drift and other like sources of error affecting the magnitude of the transducer output signal.
Inventors:
AREKISANDAA KEIDO
SAMU EMU KARADOSHII
SAMU EMU KARADOSHII
Application Number:
JP21155984A
Publication Date:
June 03, 1985
Filing Date:
October 11, 1984
Export Citation:
Assignee:
GEN MOTORS CORP
International Classes:
B62D5/04; B62D6/00; B62D6/10; B62D119/00; (IPC1-7): B62D5/04
Domestic Patent References:
| JPS5741267A | 1982-03-08 |
Attorney, Agent or Firm:
Masao Okabe
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