Vehicular drive system with forward-only mode and associated method

摘要

Abstract of the Disclosure A drive system for a work vehicle comprises a control unit adapted to: monitor output of a speed ratio setting input device for a speed ratio setting request signal and output of a drive-request input device for a FWD-only request signal, determine from the speed ratio setting request signal if a requested speed ratio setting represented thereby is one of at least one predetermined speed ratio setting among a plurality of speed ratio settings possible for the work vehicle upon receipt of the FWD-only request signal, and, if so, output at least one control signal engaging a FWD-only mode enabling FWD operation of the work vehicle but disabling RWD operation of the work vehicle. An associated method is disclosed. Drive-Request - 40 38 Input Device Engine Trim Speed Ratio Setting Speed Device Input Device Sensor 36 56PI"A '54 1 42 CONTROL UNIT 44 FWD Controller RWD Controller 48PIII LI:]50 48PI 4IP50 L L------------------------------- //-172 32 -FWD Transmission DRWD Transmission Pump 7 2 Pump Motor Mor Direction L Sensor L--76 Front 24 Front Rear Drive Wheels Drive Drive Wheel Whel3 30 Fig. 2