Research On Energy-saving Control Technology Of Distributed Drive Pure Electric Bus

With the increasing energy crisis and environmental pollution,the sustainable development of energy and environmental protection have become the biggest challenges that the whole world will face in the 21 st century.At the same time,it has also promoted the application of new energy-saving and environmentally friendly vehicles,and electric vehicles have gradually become the preferred option for the transformation and upgrading of new generation energy driving products.For our urban transportation,pure electric buses are undoubtedly regarded as a kind of good news,which can not only achieve energy saving and environmental protection,but also help reduce noise.The state also provides financial subsidies for pure electric vehicles.At the same time,it is required not only to pay attention to the technological development of power batteries,but also to conduct further research on energy-saving control technologies to reduce energy consumption and increase driving range.The structural feature of the distributed drive pure electric bus is that the drive motor is distributed to each wheel.It has the advantages of compact structure,short transmission chain,high transmission efficiency,low body floor and large space.It is particularly suitable for urban bus,and will become a new generation of pure electric bus model to replace the existing centralized drive electric bus,and it is also one of the current hotspots of new energy bus research.This article is based on a three-axle distributed-drive pure electric passenger car as the research object.The control strategy of torque distribution among the drive shafts and the control strategy of regenerative braking energy recovery are studied.Firstly,an optimized control method of torque distribution between each drive shaft based on the best efficiency of the motor is proposed.According to the energy consumption and efficiency of the motor,the optimal control strategy of the torque distribution between the shafts based on the best efficiency of the motor is developed,and the optimal distribution ratio table of the middle and rear axle torque is obtained.And built the vehicle dynamics model and simulation and data analysis under typical urban working conditions.The results show that the optimization strategy of the torque distribution of the middle and rear axles consumes less energy than the average distribution of the whole vehicle,and achieves energy saving effect.Secondly,it also studies the compound parallel braking energy recovery control strategy that meets ECE braking regulations,which is suitable for pure electric passenger cars.The distribution of regenerative braking force and mechanical friction braking force of the motor is controlled through coordinated control.At the same time,it meets the distribution requirements of ECE regulations and recovers as much of its regenerative braking energy as possible.And modeling and simulation analysis under typical urban working conditions.The results show that this strategy has a significant effect on energy recovery of regenerative braking and can increase its driving range.This article has conducted an in-depth study on the energy-saving and control of the driving and braking of a distributed-driven pure electric bus.Through simulation and verification analysis,it is found that the strategy can effectively reduce the energy consumption of the vehicle,improve the driving range and improve the economic model of the vehicle under typical urban working conditions.