Design and Implementation of Fuzzy Logic Transmission Control Unit for a Heavy Machine (Off-Highway Truck)

Shift schedule and torque converter lockup schedule are designed based on parameters of the vehicle. In addition, Optimization of shift quality based on uniform design method, which can reduce test time, is put forward and the application method is specified. Furthermore, circuit diagram of transmission control unit (TCU) hardware including power supply module, signal input channels, signal output channels are designed, and then TCU hardware is manufactured. Finally, dynamic performance, constant speed fuel economy and shift quality of vehicle equipped with the TCU are inspected, satisfactory results are obtained.