Traction control apparatus

G - Physics – 05 – D

Patent

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Details

341/73.41

G05D 13/62 (2006.01) B60T 8/175 (2006.01) B60T 8/34 (2006.01) B60T 8/48 (2006.01)

Patent

CA 1040289

ABSTRACT OF THE DISCLOSURE A traction control system for a vehicle having a plurality of driven wheels connected by differential means, wheel brake means associated with each driven wheel, and spring brake-operating means for operating each of the wheel brakes, respectively, each of said spring brake means including a brake diaphragm operable between brake-engaged and brake-released positions, a locking spring operable to place the brake diaphragm in the brake-engaged position, and a spring diaphragm operable between a normal spring- disabling position and a spring-enabling position in which the locking spring is inoperative and operative, respectively; a sensor at each driven wheel provides a velocity sensing signal; comparison circuit means compare said sensing signals to produce a control voltage when the rotational velocity of one driven wheel exceeds the velocity of another by a predetermined amount; means operable by the control signal places the spring diaphragm associated with the faster driven wheel in the spring-enabling position, thereby to effect braking of the faster driven wheel and to produce transfer of driving torque to the slower driven wheel. The invention also has utility in vehicles having tandem driven wheels which are connected through interaxle differential means, similar sensor and comparison means being operable when the velocity of one pair of driven wheels exceeds the velocity of another pair by a predetermined amount for placing in the spring- enabling positions the spring diaphragms associated with the wheels of the faster driven wheel pair. The invention improves over anti-skid braking systems, and has the advantage that traction control is effected solely on the secondary side of the braking system.

239440

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