基于自动变速的混合动力装载机控制策略

为了提高装载机能源的利用率与变矩传动效率,通过分析某5 t装载机的工况特点,提出了基于自动变速的并联式混合动力方案;采用模糊逻辑控制策略,通过在线估计系统需求转矩与车速,以需求转矩、超级电容SOC值、车速、油门开度及液力变矩器效率作为输入,输出发动机与电动机的工作点及系统挡位.结果表明:发动机效率提高,超级电容SOC值稳定,挡位变化合理有效,混合动力比传统装载机节油约9.56%,混合动力自动变速比传统装载机节油约11.82%,改善了燃油经济性.

Control Strategy Based on Automatic Transmission for Hybrid Loader

According to the analysis on the working condition characteristics of a 5 tons loader， a parallel hybrid solution based on automatic transmission was proposed for improvement of energy efficiency and torque transmission. The torque and speed online was estimated by fuzzy logic control strategy. We set torque requirement， SOC value of the super capacitor， vehicle speed， accelerator-pedal position and efficiency of hydraulic torque converter as inputs， and the operating point of the engine and the motor and gear of the system as outputs. The results showed that the engine efficiency is improved， the SOC value of the super capacitor is stable， and the gear change is rational and efficient. The hybrid loader saves about 9.56% fuel than that of the conventional one. Meanwhile， the hybrid loader of automatic transmission saves about 11.82% fuel than that of the conventional one， therefore this strategy can improve the fuel economy.