Zeng Xiaohua

Parameter design for power train and performance simulation of electrical city bus

In this paper, based on a battery pure electric city bus, principle researches have been offered on the parameters matching of the power-train and main components. The vehicle system was designed integrated, and then simulation platform was developed and established. The dynamic and economy performance can be predicted based on the above work, results show that the designed pure electric city bus can meet the performance demands and validate rationality of the parameters matching.

Forward simulation model precision study for hybrid electric vehicle

Co-simulation model of forward hybrid electric vehicle (HEV) is established in this paper. And according to three aspects: traditional vehicle model (mechanism system model), electric system model and vehicle control strategy, the precision of the co-simulation model has been analyzed and checked by the revolving drum test bench of the First Automobile Workshop (FAW). The forward simulation model database is founded to perfect the forward model platform of HEV, which will be a developing foundation for the new vehicle design.

Study of Shifting without Driving Force Interrupt for Double Electric Motor HEV

For traditional gearbox, the engine power is cut off while shifting, which will interrupt the power of power-train, make velocity down, affect the acceleration of up gear and lower the vehicle dynamic. A double electric motor hybrid electric vehicle (HEV) that designed in a particular integrated power-train structure provides the necessary condition to deal with power interrupting while shifting. In this paper, theory and control method of shifting without driving force interrupt (SWDFI) are studied. The evaluation indicators for SWDFI are advanced and the model of double electric motor HEV is used to analyze the performance of the vehicle. Results show that question of shifting with driving force interrupt is solved, which improves the dynamic of HEV.

Application of CAN Bus to HEV Based on MPC5xx Microcontroller

In this paper, CAN Bus, which works in good real-time and high reliability, was designed and programmed based on 32-bit CPU-MPC5xx with high performance for hybrid electric vehicle (HEV). HEV controller based on MPC5xx was developed which can transfer data by CAN Bus with other ECUs of drivetrain assemblies such as engine, motor and battery according to the HEV control algorithm and requirements. To verify the reliability of HEV controller based on MPC5xx and the accuracy of data transmission over CAN Bus, the bench test platform was established based on the dynamometers. Test results show that not only CAN communication is reliable and accurate, but also HEV controller based on MPC5xx can effectively harmonize the task distribution among all ECUs of drivetrain assemblies with the real-time control improved greatly for HEV control system.

Notice of Retraction Analyses of car fuel consumption based on driving cycles

Aimed at the difficulty of effectively analyzing fuel consumption characteristics for the conventional vehicle, this paper combined with the engine work time and engine fuel rate based on the vehicles drive cycles, and used visual analysis to find out the engine fuel consumption characteristics of the detail three-dimensional distribution. The results show that, for the actual engine operating point of vehicles urban drive cycles, the vast majority is falling into the low speed and low-load zone, and in these regions engine consumes too much fuel. Furthermore, the results can also indicates the direction of energy-saving design of the engine, i.e. high efficiency of engine MAP should be matched with the low-speed and low-load zone according to the vehicles drive cycles. and engine should be downsized by hybrid technology. These works have great practical significance for enterprise products renewal and energy-saving design.

Parameter matching for hybrid plug-in bus

Based on the first generation of hybrid electric city bus CA6110HEV developed by FAW (First Automobile Workshop) in China, the new generation of hybrid plug-in bus was designed, mainly including the parameters matching for the power-train and power sources. Then simulation platform were developed and established. The dynamic and economy performances were predicted based on the above work, results showed that the designed hybrid plug-in bus can meet the performance demands and validated rationality of the parameters matching.

Parameter matching of induction motor for electric vehicle based on orthogonal design

The fundamental performance parameters of traction motor for electric vehicle directly influence the motor efficiency region, so the maxima driving range of vehicle is affected. According to empirical design formulae and orthogonal optimization theory of induction motor, this paper designs an orthogonal project with four factors. The simulation results of china city driving cycle that come from electric vehicle model built in Advisor was applied for range analysis, then the optimal level of each factor was decided. At last, the optimal parameters matching scheme of induction motor for this driving cycle was estimated.

Analysis of hybrid transit bus performance test

This paper mainly discussed the performance test of the sample hybrid electrical bus on the dynamometer test bench for analyzing the driving ability and the fuel economy. And the fuel economy conversion method of the conventional bus was introduced according to the characteristics of the hybrid electrical vehicle (HEV). In addition, in order to further improve the performance of HEV, the new control strategy was presented on the basis of the primary control algorithm. Finally the bench tests were performed for the diverse drive cycles. The test results show that the hybrid bus can indeed save fuel considerably in diverse drive cycles compared with the similar conventional bus. In particular, in the Beijing city drive cycle the fuel can be saved 30% more than the conventional one, which fully shows the superiority of HEV.