考虑效率的静液压驱动车辆燃油经济性控制

To achieve optimal fuel economy for hydrostatic propulsion vehicles, a fuel economy control strategy considering pump and motor efficiency is proposed. Firstly, the role of system fuel consumption in relation to engine efficiency and hydrostatic drive system efficiency is analyzed. On the basis of the efficiency analysis, the optimal speed ratio for the joint efficient operation of the engine and hydrostatic propulsion system at various throttle openings and vehicle speeds is obtained with the goal of minimizing fuel consumption. A simulation model is established to compare the control strategies before and after optimization. The results indicate that the fuel consumption is reduced by 8.74% under cyclic operating conditions. To address the difficulty in obtaining practical system efficiency, an efficiency correction factor is proposed to modify the theoretical control strategy. A test vehicle is constructed, the model accuracy and the validity of proposed method are verified by vehicles. The results of a 40 km/h constant speed driving test demonstrate that the 100-kilometre fuel consumption is reducible by the proposed control strategy, achieving good fuel economy for hydrostatic propulsion vehicles.