Steering responsive wheel drive system

Details Steering responsive wheel drive system Steering responsive wheel drive system

2007-11-06

2007-11-06

Winner, Tony (Department: 3611)

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

C180S242000

Reexamination Certificate

active

11133260

ABSTRACT:
A vehicle drive speed control system is provided for a vehicle having driven rear wheels, driven steerable front wheels, a powertrain for driving the front and rear wheels at controllable speeds. A control unit controls the powertain so that a front/rear wheel speed ratio is a non-linear trigonometric function of a sensed steering angle signal. The front/rear wheel speed ratio increases as the steering angle increases. The relationship of the front/rear wheel speed ratio to the steering angle is represented by a curve which is concave in a direction of an axis of increasing speed ratio. With a mode select switch, an operator can selectively cause the control unit to control the front/rear speed ratio according to a first normal or a second more aggressive predefined relationship.

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