Abstract:
A steering apparatus (10) for turning steerable wheels of a vehicle having first and second sets (14 and 16) of steerable wheels comprises a first steering gear (22) actuatable, in response to rotation of a handwheel (110), to effect turning of the first set (14) of steerable wheels. The steering apparatus (10) also comprises second and third steering gears (24 and 26), each of which is independently actuatable to effect turning of the second set (16) of steerable wheels and thereby providing redundancy for turning of the second set (16) of steerable wheels. A sensor (112) senses a steering position of the first set (14) of steerable wheels and provides a steering signal indicative of the sensed steering position. A controller (114) receives the steering signal and, in response to the steering signal, controls actuation of the second and third steering gears (24 and 26).
Abstract:
A vehicle steering apparatus (10) includes a steering wheel motor (20) which is connected with a steering wheel (12) of a vehicle. The steering wheel motor (20) is energizable by electric current to resist rotation of the steering wheel (12). A variable resistor (60) is connected in parallel with the steering wheel motor (20) and is adjustable to vary the electric current which energizes the steering wheel motor. A road wheel steering motor (16) is connectable with steerable road engaging wheels of the vehicle. The road wheel steering motor (16) is energizable by electric current to effect turning movement of steerable road-engaging wheels in response to rotation of the steering wheel (12). The variable resistor (66) is connected in parallel with the road wheel steering motor (16) and is adjustable to vary electric current which energizes the road wheel steering motor.