# Experimental Research on Braking Feedback and Taxing Feedback System of New Energy Vehicles
## 4 Conclusions  
In this thesis, an experimental study on braking feedback as well as taxiing feedback systems for new energy vehicles was conducted with the following main findings. For stacked and coordinated brake energy recovery systems, a number of studies were conducted with and without glide feedbacks. The differences between a stacked and a coordinated system under the same operating conditions and on the same road sections were tested as well as the fuel economy contribution with and without the glide feedback system. The integration and application of the braking energy recovery system in a purely electric bus was carried out, and the difference in the economic contribution of the braking energy recovery of the whole vehicle under different braking energy recovery control strategies was tested and compared. The results showed that the coordinated brake energy recovery control strategy can effectively utilize the maximum torque that can be fed back by the motor. The integration and application of the braking energy recovery system was carried out on a hybrid bus, and the difference in the economic contribution of the vehicle under different cycle conditions with and without taxiing was tested and compared. The results showed that fuel consumption was reduced under different conditions in the skid feedback mode than without the skid feedback mode. In the case of the Yutong, for example, the fuel consumption was reduced by approximately 20.8%, and the fuel economy contribution increased by approximately 17.3% with a skid feedback mode than without a skid feedback mode. In view of the developmental status and trends in the field of braking energy recovery and anti-skid control of new energy vehicles, combined with the research content and results of the subject, the research work of this paper can also be deepened and expanded upon from the following aspects. 1. The real vehicle verification of different models and driving conditions can be carried out under the different braking energy recovery control strategies and taxiing feedback strategies proposed in this paper. The effects of the superposition and coordinated braking energy feedback strategy and energy recovery strategy under taxiing condition on vehicle energy consumption can be further discussed;
2. In terms of hardware in the loop test bench, the pneumatic braking test bench and the electric drive system dynamics test bench can be integrated to be realized simultaneously in the loop test of a friction braking system and electric drive/braking system. It lays the foundation for further research on different strategies and schemes of electric vehicle energy recovery; \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Working Condition**} & \multicolumn{2}{c}{**Fuel Consumption**} \\  & **per Hundred Kilometers (L/100 km)** \\ \cline{2-3}  & **No Taxing Feedback** & **Taxing Feedback** \\ \hline China’s typical city & & \\ bus conditions & & \\ Yutong working conditions & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Fuel economy contribution rate. In addition, in the future, we are considering for the next step of testing the use of collected energy for the start of movement of those same vehicles to calculate how much petroleum fuel can be saved when certain cities reach 10%, 50%, or 90% of their hybrid bus fleets and to conduct a study on the total cost of oil and electricity;
* Improving the range of new energy vehicles is not only about braking energy recovery and coasting energy recovery. Wireless charging, hybrid charging, and photovoltaic charging can also provide energy to the vehicle while it is running. Conception and writing of the original draft preparation, N.L. ; assisted in implementing the research content of the paper, providing critical comments, Y.L. ; visualization, S.T. All authors have read and agreed to the published version of the manuscript. This research received no external funding. Ethical review and approval were waived for this study due to the fact that this paper did not involve ethical issues.