摘要
Recently,plug?in hybrid electric bus has been one of the energy?e cient solutions for urban transportation. However,the current vehicle e ciency is far from optimum,because the unpredicted external driving conditions are di cult to be obtained in advance. How to further explore its fuel?saving potential under the complicated city bus driving cycles through an e cient control strategy is still a hot research issue in both academic and engineering area. To realize an e cient coupling driving operation of the hybrid powertrain,a novel coupling driving control strategy for plug?in hybrid electric bus is presented. Combined with the typical feature of a city?bus?route,the fuzzy logic inference is employed to quantify the driving intention,and then to determine the coupling driving mode and the gear?shifting strategy. Considering the response deviation problem in the execution layer,an adaptive robust controller for electric machine is designed to respond to the transient torque demand,and instantaneously compensate the response delay and the engine torque fluctuation. The simulations and hard?in?loop tests with the actual data of two typical driving conditions from the real?world city?bus?route are carried out,and the results demonstrate that the pro?posed method could guarantee the hybrid powertrain to track the actual torque demand with 10.4% fuel economy improvement. The optimal fuel economy can be obtained through the optimal combination of working modes. The fuel economy of plug?in hybrid electric bus can be significantly improved by the proposed control scheme without loss of drivability.
Recently,plug?in hybrid electric bus has been one of the energy?e cient solutions for urban transportation. However,the current vehicle e ciency is far from optimum,because the unpredicted external driving conditions are di cult to be obtained in advance. How to further explore its fuel?saving potential under the complicated city bus driving cycles through an e cient control strategy is still a hot research issue in both academic and engineering area. To realize an e cient coupling driving operation of the hybrid powertrain,a novel coupling driving control strategy for plug?in hybrid electric bus is presented. Combined with the typical feature of a city?bus?route,the fuzzy logic inference is employed to quantify the driving intention,and then to determine the coupling driving mode and the gear?shifting strategy. Considering the response deviation problem in the execution layer,an adaptive robust controller for electric machine is designed to respond to the transient torque demand,and instantaneously compensate the response delay and the engine torque fluctuation. The simulations and hard?in?loop tests with the actual data of two typical driving conditions from the real?world city?bus?route are carried out,and the results demonstrate that the pro?posed method could guarantee the hybrid powertrain to track the actual torque demand with 10.4% fuel economy improvement. The optimal fuel economy can be obtained through the optimal combination of working modes. The fuel economy of plug?in hybrid electric bus can be significantly improved by the proposed control scheme without loss of drivability.
基金
Supported by National Natural Science Foundation of China(Grant No.51605243)
National Key Science and Technology Projects of China(Grant No.2014ZX04002041)
1-class General Financial Grant from the China Postdoctoral Science Foundation(Grant No.2016M590094)
作者简介
Qin-Pu Wang,born in 1964,is the General Manager Assistant at Zhongtong Bus Hold Co.,Ltd.,China.He received his bachelor degree from Xi’an Highway Institute,China,in 1984.His research interests include design and manufacture of hybrid electric vehicle.E-mail:QinPu_Wang@163.com;Chao Yang,born in 1986,is currently a postdoctoral fellow at State Key Laboratory of Automotive Safety and Energy,Tsinghua University,China.He received his PhD degree on Control Science and Engineering from Yanshan University,China,in 2016.His research interests include energy-efficient control strategy design for hybrid electric vehicles.E-mail:chaoyang1986@tsinghua.edu.cn;Correspondence:Ya-Hui Liu,born in 1980,is currently an associate professor at State Key Laboratory of Automotive Safety and Energy,Tsinghua University,China.He received his bachelor degree from Jilin University,China,in 2003 and PhD degree from Beihang University,China,in 2009,respectively.His research interests include vehicle system dynamics,steering system and driver-vehicle system.E-mail:liuyahui@tsinghua.edu.cn;Yuan-Bo Zhang,born in 1990,is currently working at State Key Laboratory of Automotive Safety and Energy,Tsinghua University,China.His research interests include regenerative braking control strategy for electrified vehicles.E-mail:yuanbzhang@163.com.
