Inventors:
Paul D. Agarwal - Troy MI
Roger D. Fruechte - Rochester MI
Alexander Kade - Detroit MI
Thomas A. Radomski - Utica MI
Assignee:
General Motors Corporation - Detroit MI
International Classification:
B64C 132
B64C 1304
G06G 766
G05B 1302
Abstract:
The torque gain of an electric motor assisted power steering system is modified as a function of the estimated level of road load friction such that the relationship between the operator exerted steering torque and the resulting rate of steer is substantially insensitive to a reduction in the level of road load. The road load is estimated as a function of the operator exerted steering torque, the torque assist provided by the electric motor, and the resulting steer rate.