Coordinated Shift Control and Experimental Study of Two-speed AMT for Pure Electric Vehicle

XIAO Lijun, WANG Ming, ZHONG Zhihua, ZHANG Bangji, XU Weidong

Abstract

In order to improve the shifting smoothness and to reduce the shifting time of the two-speed Automated Manual Transmission（AMT） equipped on the pure electric vehicle， the mathematical model of the powertrain system was developed， and the comprehensive coordinated control strategies in which the motor participates in the shifting process were designed. The motor torque control law of torque phase was derived from the maximum allowable shift impact，and the PID and finite state switching control strategy were adopted to regulate motor speed during the inertia phase. Additionally， a test rig of the pure electric vehicle transmission system was built for the up-shift and down-shift test. The simulation results show that the up-shift time of 0~100 km/h full acceleration is 0.5 s， the longitudinal impact is within 8.0 m/s3， and the up-shift and down-shift time in the NEDC urban conditions are both within 0.6 s， and the maximum impact does not exceed 7.8 m/s3. The test results show that the up-shift and down-shift time is 0.6 s and 0.8 s，respectively，which is in the condition that the drive motor under fixed speed control， and the output shaft speed changes smoothly. Because the shift time of the traditional AMT vehicle is 0.8~1.0 s， the above results show that the comprehensive coordination shift control strategy can achieve fast and smooth shifting.

 

 

Keywords: electric vehicles,  two-speed AMT,  shifting smoothness,  coordinated shift control strategy,  experimental verification


Full Text:

PDF


References


GERSSEN –GONDELAСH S J, FAIJ A P С. Performance of batteries for electric vehicles on short and longer term [J]. Journal of Power Sources, 2012, 212(9):111—129.

ZHU B, ZHANG N, WALDER P, et al. Gear shift schedule design for multi –speed pure electric vehicles [J]. Proceedings of the Institution of Mechanical Engineers Part D–Journal of Automobile Engineering, 2014, 229 (1):70—82.

GONG X B,TANG Z Q,MA J,et al. Optimization design of powertrain parameter for in –wheel motor driven electric vehicles [J]. Journal of Hefei University of Technology (Natural Sciences), 2017, 40 (3):310—315 (In Chinese)

BANG F,FANG Z D, ZHU X Y. Matching, simulation and optimization of the new power transmission devise for an electrics vehicle [J]. Automotive Engineering,2011,33 (9):805—808 (In Chinese)

LIU F X, ZHAO H, JIANG H. Research on the simulation of AMT shift schedule for pure electrics vehicle [J]. Journal of Hefei University of Technology (Natural Sciences), 2013, 36 (11):1281— 3448 (In Chinese)

YUE H Q, ZHU С Y, GAO B Z. Fork–less two–speed I–AMT with overrunning clutch for light electrics vehicle [J]. Mechanism and Machine Theory, 2018 (130):157—169.

TIAN Y, RUAN J, ZHANG N, et al. Modeling and control of a novel two –speed transmission for electric vehicles [J]. Mechanism & Machine Theory, 2018 (127) :13—32.

NGUYEN T S, SONG J, FANG S N, et al. Simulation and experimental demonstration of a seamless two –speed automatics mechanical transmission for electric vehicles [J]. Journal of Tsinghua University (Science and Technology), 2017, 57 (10): 1106—1113 (In Chinese)

ZHONG Z, KONG G, YU Z, et al. Shifting control of an automated mechanical transmission without using the clutch [J]. International Journal of Automotive Technology, 2012, 13 (3):487—496.

BANG H L, LIU H O, GUAN С H. A Study on gear shifting control of AMT in heavy –duty vehicles [J]. Automotive Engineering, 2009, 31(6):540—544. (In Chinese)

BALDER P D, FANG Y H, ZHANG N. Dynamics and control of clutchless automated manual transmissions for electrics vehicles [J]. Journal of Vibration and Acoustics, 2017, 12 (139):061005.

HU M H, ZENG J F, XU S Z, et al. Efficiency study of a dual–motor coupling EV powertrain [J]. IEEE Transactions on Vehicular Technology, 2015, 64( 6):2252—2260.


Refbacks

  • There are currently no refbacks.