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考虑到并联混合电动车辆(HEV)动力系响应滞后,建议采用无级变速器(CVT)速比控制方法来实现HEV的燃油经济性的改进。在该方法内,由估算于动力系响应滞后之后根据车辆速度来修正目标CVT速比,并推荐一个加速图谱来估算响应滞后的车辆速度。该CVT速比控制方法采用HEV台架试验机试验证实。根据试验结果,可以看到用修正速比控制方法发动机工作迹线比用常规CVT速比控制对于适度加速模式可以有更有效换档范围,故能给出最佳的燃油经济性。此外,还采用HEV动力系模型对联邦城市驱动计划性能仿真进行估算响应滞后对燃油经济性的影响。仿真结果表明作为响应滞后采用修正CVT速比增大可以实现最佳的燃油经济性。但在实际应用中,要求最佳燃油经济性和加速性能之间进行折衷。
Given the hysteresis of the parallel hybrid electric vehicle (HEV) powertrain response, it is advisable to employ a continuously variable transmission (CVT) ratio control method to achieve HEV fuel economy improvement. Within this method, the target CVT speed ratio is modified from the vehicle speed after estimating the powertrain response lag, and an acceleration map is recommended to estimate the vehicle speed in response to the lag. The CVT speed control method using HEV bench test confirmed. Based on the test results, it can be seen that using the modified speed ratio control method engine engine operating trajectories can provide a more efficient shift range for moderation accelerations than for conventional CVT speed ratios, giving the best fuel economy. In addition, HEV powertrain models were also used to estimate the impact of federal lagged drive planning on fuel economy. The simulation results show that the optimal fuel economy can be achieved by adopting a modified CVT ratio increase as response lag. But in practice, a compromise is required between the best fuel economy and accelerated performance.