Power steering apparatus

Details Power steering apparatus Power steering apparatus

1999-11-01

2000-12-12

Culbreth, Eric

Motor vehicles

Steering gear

With electric power assist

701 41, B62D 599

Patent

active

061585459

ABSTRACT:
In a power steering apparatus according to the present invention, a threshold ITH of a motor electric current for actuation of an oil pump is set at a lower level when a working oil has a high viscosity resistance at a low oil temperature, so that the oil pump can be actuated at an earlier stage. Conversely, when the working oil has a low viscosity resistance at a high oil temperature, the threshold ITH of the motor electric current for the actuation of the oil pump is set at a higher level because there is no need to actuate the oil pump at the earlier stage. Thus, the electric motor can be actuated without any problem even at an extremely low temperature, so that an entrapped feeling can promptly be mitigated.

REFERENCES:
patent: 4771843 (1988-09-01), Shimizu
patent: 4771845 (1988-09-01), Shimizu
patent: 4789040 (1988-12-01), Morishita et al.
patent: 4800974 (1989-01-01), Wand et al.
patent: 4869334 (1989-09-01), Marumoto et al.
patent: 4934473 (1990-06-01), Fushimi et al.
patent: 4986379 (1991-01-01), Morishita
patent: 5103926 (1992-04-01), Ohno et al.
patent: 5623409 (1997-04-01), Miller

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