基于功率转速双闭环的增程器发电功率动态控制策略

Dynamic Control Strategy of the Generation Power of A Range Extender Based on Power-Speed Dual Loop

针对电动汽车内燃发电增程器发电功率动态控制存在的控制精度不高、响应滞后和反向超调等问题,提出并设计了一种结合功率/转速双闭环的增程器发电功率动态控制策略。该策略基于高效运行曲线进行发电功率的转矩/转速解耦,同时考虑了基于实际发电功率反馈的内燃机目标发电转矩修正、发电转矩转速动态协调修正。变工况发电试验结果表明,增程器发电过程中的发电功率最大正向超调为1.37 kW,最大反向超调为1.89 kW,稳态误差均小于0.01 kW,功率上升响应时间约为2.5 s,功率下降响应时间约为2.8 s,且工作点均在高效运行曲线附近。该增程器发电功率动态控制策略能够减少瞬态发电功率的响应滞后和反向超调的问题,在工程实践中具备可行性。

To address issues of low control accuracy,lagging response and reverse overshoot in the dynamic power control of range extender for electric vehicles,a dynamic power control strategy based on power-speed dual loop was proposed.In this strategy,the generating power was decoupled into torque and speed based on an efficient operating curve.Additionally,the target generating torque correction based on the actual generating power feedback and dynamic coordination correction of generating torque speed were considered.The test results show that during the power generation process of the range extender,the maximum positive overshoot is 1.37 kW while the maximum negative overshoot is 1.89 kW,and the steadystate error is less than 0.01 kW.Rising response time is about 2.5 s while falling response time is about 2.8 s.Moreover,all operation points are near efficient operating curves.Therefore,the proposed dynamic control strategy for power generation can reduce the response lag and reverse overshoot of the transient power generation,which is feasible in engineering practice.