采用动态规划算法优化的液压混合动力车辆能源消耗仿真研究

Simulation study on energy consumption of hydraulic hybrid vehicle optimized by dynamic programming algorithm

为了降低车辆行驶的燃油消耗量,采用动态规划算法对液压混合动力车辆控制进行优化,并对发动机燃油消耗量进行仿真验证.建立了液压混合动力车辆简图模型,推导出车辆发动机功率方程式.创建发动机能源消耗目标函数,添加约束条件,引用动态规划算法优化目标函数,得出液压混合动力发动机能源消耗的最优参数.设计车辆控制流程图,利用Matlab软件对优化结果进行仿真,并与优化前仿真结果形成比较.仿真结果表明:在无起停的情况下,优化后的液压混合动力车辆燃油消耗量降低了11.71%;在有起停的情况下,优化后的液压混合动力车辆燃油消耗量降低了19.01%.采用动态规划算法优化液压混合动力车辆参数,车辆制动释放的能量被回收,从而节约车辆行驶所消耗的燃油.

In order to reduce the fuel consumption of the vehicle,the dynamic programming algorithm is used to optimize the control of the hydraulic hybrid vehicle,and the fuel consumption of the engine is simulated and verified.A hydraulic hybrid vehicle schematic model is established,and the power equation of the vehicle engine is derived.The objective function of engine energy consumption is created,the constraint conditions are added,and the dynamic programming algorithm is used to optimize the target function,and the optimal parameters of the energy consumption of the hydraulic hybrid engine are obtained.The flow chart of vehicle control is designed,and the optimization results are simulated by Matlab software,and compared with the simulation results before optimization.The simulation results show that the fuel consumption of the optimized hydraulic hybrid vehicle is reduced by 11.71% under the condition of no stopping,and the fuel consumption of the optimized hydraulic hybrid vehicle is reduced by 19.01%in the case of starting and stopping.The dynamic programming algorithm is used to optimize the parameters of the hydraulic hybrid vehicle,and the energy released from the braking of the vehicle is recovered,thereby saving the fuel consumed by the vehicle.