Supplementary hydrostatic drive electronic control

Details Supplementary hydrostatic drive electronic control Supplementary hydrostatic drive electronic control

B - Operations, Transporting

60

K

341/68

B60K 23/08 (2006.01) B60K 17/10 (2006.01) B60K 17/356 (2006.01) B60K 23/00 (2006.01)

Patent

CA 1113585

SUPPLEMENTARY HYDROSTATIC DRIVE ELECTRONIC CONTROL Abstract of the Disclosure An electronic control for a vehicle supplementary hydro- static front wheel drive includes a rear sensor for providing a command signal representative of the speed of differential con- nected, engine-driven, main drive wheels. A front sensor provides a feedback signal representative of the speed of the hydrostatic drive motors. The command signal is modified to provide a modi- fied command signal to be summed with the feedback signal to provide servo circuitry with a servo signal which is representa- tive of the front wheels being driven 3% slower than the rear wheels. Electrically actuated, pressure responsive clutches allow the front wheels to overrun the hydrostatic drive motors until the slip at the rear wheels exceeds 3%, then the front wheels drive to supplement the main drive wheels. A selectable overspeed circuit is provided which can modify the modified command signal to provide a servo control signal which represents the front wheels being driven 1% faster than the rear wheels so as to provide a continuous, positive supplementary drive regard- less of rear wheel slip. The servo control signal is processed through direction controllers which input the direction of the main drive wheels and which supply control signals to a servo actuator on a reversible hydraulic pump which powers the hydro- static drive motors for drive in accordance with main drive speed and direction. Both the servo and overspeed circuits are connec- ted to a hold circuit which activates and holds the overspeed circuit on to provide quick response when the direction of the main drive is changed.

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