Apparatus for stabilizing power steering for temperature effects

Details Apparatus for stabilizing power steering for temperature effects Apparatus for stabilizing power steering for temperature effects

1990-09-12

1992-02-11

Hill, Mitchell J.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

180 791, 180142, 318434, 318473, 318599, B02D 504

Patent

active

050868624

ABSTRACT:
A hydraulically assisted power steering system subject to variance in steering effort due to temperature change is compensated to give consistent response at all temperatures. A hydraulic control valve is coupled to an electromagnetic device which controls the steering effort as a function of energization current. The current is adjusted in accordance with temperature to compensate for temperature changes. A microcomputer controller stores empirical data relating to the effect of temperature on steering effort and calculates the current adjustment necessary for any measured system temperature. In one embodiment, the temperature is not measured directly but is derived from the deviation of energization current from the theoretical desired current, which deviation is a function of temperature. The effect of voltage variations is also compensated for.

REFERENCES:
patent: 4730687 (1988-03-01), Chikuma et al.
patent: 4789040 (1988-12-01), Morishita et al.
patent: 4871040 (1989-10-01), Zuraski et al.

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