Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (8): 2059-2066.doi: 10.13229/j.cnki.jdxbgxb.20250010

   

Adaptive shift control strategy of pure electric vehicle AMT based on optimal speed range

Xue-tao QIAO(),Zhu-feng GUO,Hang XU,Zeng-xiao ZHAO,Tian-hang DUAN,Xiao-zhong TIAN   

  1. School of Intelligent Mechatronics Engineering，Zhongyuan University of Technology，Zhengzhou 451191，China
  • Received:2025-01-04 Online:2026-08-01 Published:2026-09-02

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Abstract:

For the problem that it is difficult to adapt to various complex working conditions to obtain the best shift performance of two-gear pure electric vehicles under the traditional control strategy， this paper proposes an intelligent shift control method. According to the motor efficiency and vehicle driving acceleration in different gears， combined with the battery state， the traditional two-parameter optimal economic shifting law and the optimal power shifting law are obtained respectively， and the optimal shifting interval is analyzed to obtain the optimal shifting interval of the vehicle. According to the accelerator pedal opening degree and accelerator pedal change rate， the driver's driving intention is recognized through fuzzy control， and combined with the driver's intention and the vehicle speed within a reasonable range， a two-stage fuzzy control intelligent shift controller is designed， and the validity of the designed adaptive shift strategy is verified through simulation. The simulation results show that in the face of different working conditions， compared with the traditional three-parameter fuzzy gearshift control， the adaptive gearshift strategy designed in this paper can accurately combine the vehicle performance and driver's intention， reduce the frequency of gearshift， and improve the economy.

Key words: automobile engineering, pure electric vehicle, two-speed transmission, shift interval, driver intention, fuzzy control

CLC Number: 

  • U471

Fig.1

Simulation model of two gears pure electric car"

Table 1

Vehicle， motor， transmission basic parameters"

部件名称参数名称数值
整车整备质量/kg1 975
迎风面积/m22.9
风阻系数0.205
车轮半径/m0.354
电机额定功率/kW60
最高转速/（r?min-1）10 000
峰值转矩/（N?m）330
两挡变速器最终速比10.56/6

Fig. 2

Motor efficiency Map"

Fig.3

Motor efficiency curves in different gears and accelerator pedal openings"

Fig.4

Traditional economy shift law curve"

Fig.5

Vehicle acceleration curves in different gears and accelerator pedal openings"

Fig.6

Traditional power shift law curve"

Fig.7

Fuzzy input affiliation function"

Table 2

Fuzzy control rules for driver intent"

加速踏板开度加速踏板变化率隶属度
asa?nvb
asa?zb
asa?ps
ama?nb
ama?zm
ama?pvs
aba?nb
aba?zs
aba?pvs

Fig.8

Fuzzy control surface for driver intent"

Table 3

Fuzzy gear control rules"

vllblmbhhvh
vb111.62222
b111.61.8222
m111.41.8222
s111.41.81.822
vs111.21.61.822

Fig.9

Fuzzy control of gear surfaces"

Fig.10

T-S type two-stage fuzzy three-parameter shift control model"

Fig.11

Comparison of simulation under CLTC condition"

Fig.12

Comparison of simulation under NEDCconditions"

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