基于无级变速器速比控制的插电式混合动力汽车再生制动控制策略

摘要

To recover the braking energy as much as possible without affecting the driving intention,an ideal braking force distribution strategy based on threshold value is proposed.First,considering the comprehensive optimal efficiency of the motor,battery and Continuously Variable Transmission (CVT),the CVT ratio control strategy is developed.Then,the relationship between the inertia torque and intention of driving brake is obtained based on dynamic characteristic analysis of the transmission system during braking process.Third,with the goal to increase the regenerative braking power,the target of CVT speed ratio and braking force distribution is modified using discrete exhaustive optimization algorithm in combining with the comprehensive efficiency of the optimal CVT ratio control strategy.Finally,a CVT optimal control strategy is proposed based on speed ratio limitation and motor coordinated control.Simulation results show that under different braking conditions,the regenerative braking control strategy enables the vehicle to follow the driver's intention effectively during braking,and increases the recovery ratio of braking energy and improves the driving performance.%为了能够在不影响驾驶制动意图的同时尽可能多地回收制动能量,首先在基于再生制动门限值所制定的理想再生制动力分配策略的基础上,考虑电机、电池及无级变速器(CVT)综合效率最优的目标要求,制定了基于综合效率最优的CVT速比控制策略;然后,根据制动过程中传动系统动态特性分析所得到的系统惯性矩与驾驶制动意图之间的关联规律,以提高再生制动功率为目标,采用离散穷举优化方法对CVT目标速比及制动力分配进行修正,从而提出了基于速比变化限制及电机协调控制的CVT速比优化控制策略.仿真结果表明,在不同的工况下,本文提出的再生制动控制策略能使车辆在制动过程中有效跟随驾驶员的制动意图,同时提高再生制动能量回收率,改善驾驶性能.