电动公交车用增程器起停及切换过程优化

基于半实物仿真平台,对增程器起停及切换过程控制策略进行了优化.结果表明:倒拖转矩增大和倒拖终了转速提高后,增程器起动时间降至1.01s;暖机起动过程发动机颗粒排放数量浓度峰值达2.0×10~8个·cm~(-3);停机过程通过发电机加载转矩实现负载停机,转速波动得以明显抑制;采用快速起动和增大增程器输出电功率上升率限值后,整车动力性有所改善;切换过程发动机颗粒排放数量浓度峰值达2.5×10~8个·cm~(-3);发动机调速模式相对发电机调速模式,增程器电功率输出较平缓,但发动机更易偏离最佳油耗曲线.

Transit Control Strategy Optimization for Range Extender of Electric Bus

Based on a semi physical range extender experimental system, the control strategies of both start/stop and power following of range extender were optimized. Results show: with the increase of motor dragged torque and dragged end speed, the time of start process decreases to 1.01 s, the number of ultrafine particles for warm start is about 2.0×108 per cm-3; during the engine stop with load from generator, the speed fluctuation decreases obviously; with the fast start and the increase of rise limit for range extender output electric power, the bus power performance is improved; the number of ultrafine particles is about 2.5×108 per cm-3 during swithover process; the power output of engine speed control method is smoother compared with the generator speed control method, but tends to deviate from the optimum fuel consumption curve.