提升重型车辆起步性能协调控制策略

For the problem of poor starting response of heavy vehicles, a simulation model of the exhaust turbocharged diesel engine and control system is established using GT-SUITE software based on the structure of the vehicle powertrain system. The simulation model is verified through bench test, ensuring that the powertrain system model has high simulation accuracy. Through simulation, the influences of smoke limit and coupling working point of hydraulic torque converter on starting acceleration performance are explored, and the mechanism of the coupling characteristics of engine and hydraulic torque converter on the improvement of vehicle starting performance is clarified. A vehicle starting coordinated control strategy is developed to improve 0 - 32 km / h acceleration performance of vehicle. The proposed coordinated control strategy is simulated and verified based on the established power transmission system simulation model. The results show that the starting time of vehicle to accelerate from 0 km / h to 32 km / h is 9. 8 s when the proposed coordinated control strategy is used, while the time for conventional starting vehicle to accelerate from 0 km / h to 32 km / h is 14 s. The proposed coordinated control strategy has a significant effect on improving the starting acceleration performance of heavy vehicle.