Motor vehicles – Compensating devices
Patent
1990-08-15
1991-11-26
Hill, Mitchell J.
Motor vehicles
Compensating devices
180143, 318432, 36442405, B62D 504
Patent
active
050675761
ABSTRACT:
A variable effort steering system disclosed herein changes the steering effort required to maneuver a vehicle which lacks power-assisted steering by modifying an electromagnetically applied holding torque exerted upon the steering shaft. By increasing or decreasing the applied holding torque, a change in the steering wheel's resistance to movement can be sensed by the driver. The device of the present invention allows the same high mechanical advantage steering gear ratio having a mechanical advantage to be deployed effectively over the spectrum of vehicle dynamic states. The resistive force exerted is a function of any dynamic state of the vehicle, such as its speed, thereby producing, for example, high speed steering stability. The variable effort steering system proposed includes a variable load actuator having a rotary member which is mounted upon the steering shaft, a stationary member surrounding the rotary member and at least one core which extends towards the rotary member. Windings are provided around the cores. When a current is delivered through the windings, a magnetic field is produced and a holding torque is exerted on the rotary member. The holding torque resists the turning motion of the rotary member, the steering shaft, and consequently, the manually applied torque.
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Ford Motor Company
Hill Mitchell J.
May Roger L.
McKenzie Frank G.
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