CONTROL SYSTEM FOR REVERSER TRANSMISSION HAVING AGGRESSIVE AND NON-AGGRESSIVE MODES

摘要

A control system for a utility vehicle transmission provides for operatorselection of vehicle "aggressiveness," or rates of acceleration in response tooperator command. The aggressiveness of a vehicle's performance can becontrolled by modulating control signals to proportional control valves, whichdetermine the transmission acceleration, according to two or more electricalramp-up (or ramp-down) profiles, in response to an operator's accelerationcommand (or deceleration command). The transmission control systemincludes a controller, directional switches and electro-hydraulic valves whichcontrol hydraulic pressure in the clutch packs in a reverser transmission. Theoperator is provided with a two-position set switch. With the set switch intheless aggressive position, in response to an operator's command, the softwarein the controller provides a relatively slow current ramp to energize thecontrolvalves. With the switch in the more aggressive position, the current rampsand resultant pressure ramps are faster, thus causing more aggressivetransmission operation for the reverser transmission.