# Experimental Research on Braking Feedback and Taxing Feedback System of New Energy Vehicles
## 3 Complete Vehicle Integration and Test System for Brake Energy Recovery System
### Brake Energy Recovery System Energy Economy Test Results
#### 3.4.2 Comparison of the Coasting Braking Feedback Strategy and Pedal-Free Stroke Strategy  
The coasting braking feedback strategy is to provide feedback braking force from the motor when the vehicle is coasting, i.e. when the accelerator pedal is released and the brake pedal travel does not exceed the mechanical free travel. In the actual daily operation of the vehicle, the driver sometimes performs long distance coasting driving. Considering the vehicle driving cycle and coasting phase, Yutong develops Yutong working condition internal test according to the bus driving characteristics, which only stipulates the distance of each start-stop of the vehicle and does not stipulate the specific driving mode of the driver in the driving process. process for  
Figure 11: Cyclic tests of the stacked brake energy recovery strategy. Figure 10: Coordinated braking energy recovery strategy cycling condition test. simply simulating the operation of the bus line at the stopping point [31]. The driver's driving habits determine the speed of the vehicle at every moment and the time spent by the vehicle during acceleration, braking and coasting. In this case, the driver's driving habit is usually to accelerate the vehicle to a certain speed by pressing the gas pedal (acceleration phase)--release the gas pedal to make the vehicle slide for a period of time (coasting phase)--press the brake pedal to slow the vehicle to a stop (braking phase). If motor braking is not performed in the coasting phase, then in the braking phase after the coasting phase, the driver is bound to increase the braking intention to stop the vehicle at the point specified in the working conditions, when the motor power may not be able to meet the total braking force demand, and pneumatic braking force is needed to compensate, thus consuming the kinetic energy of the braking process. If coasting braking feedback is introduced, the motor keeps braking during the vehicle coasting process and reaches the braking stage, the driver no longer needs excessive braking force to slow down the vehicle, thus reducing the pneumatic friction braking force in total braking and improving the utilization of braking energy [32]. Based on the hybrid city bus platform described in the previous section, fuel consumption tests were conducted for typical Chinese city bus cycle conditions, the Yutong conditions for the pedal-free travel recovery braking control strategy, and the recovery braking control strategy with coasting feedback. The results of the typical Chinese city bus cycle conditions and the Yutong conditions are shown in Figures 12-15. Figure 12: Typical urban bus cycle conditions in China (no taxing feedback). Figure 14: Yutong driving conditions (no taxiing feedback). Figure 13: The typical Chinese city bus circle driving conditions (with taxiing feedback). Figures 8 and 9 show the working conditions of a typical city bus cycle in China. In a typical Chinese city bus cycle, the fuel consumption of the no-glide feedback strategy is 1.4 L, and the vehicle distance is 6.08 km; with the glide feedback strategy, the vehicle speed was not accelerated to 60 km/h in the last acceleration stage due to the road condition, and the distance was slightly shorter, 5.46 km, and the fuel consumption was 1.26 L.  
Figures 14 and 15 show the working conditions for the test of the Yutong working condition. It can be seen that since the Yutong condition is a cyclic condition based on the starting and stopping points, both had the same driving distance of 5.0 km, but the fuel consumption was significantly different. The fuel consumption of the braking energy recovery strategy without coasting feedback was approximately 1.8 L, while the fuel consumption of the braking energy recovery strategy with coasting feedback was only approximately 1.4 L [33].