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Optimization Method of Reference Slip Speed in Clutch Slip Engagement in Vehicle Powertrain

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Abstract

Recently, as vehicles are getting more intelligent, interest in improving vehicle ride comfort has been increasing. Appropriate control of a clutch in the vehicle powertrain can play a major role in improving the vehicle ride comfort. Previously, many researches on tracking controllers of clutch slip speed and clutch transmitted torque in clutch slip engagement control have been conducted. However, little research on an optimization method of the reference clutch slip speed and clutch torque has been performed. Therefore, in this study, the optimization method of the reference clutch slip speed in clutch slip engagement in the vehicle powertrain is proposed to improve clutch lifespan and vehicle ride comfort. The proposed method is verified through clutch slip engagement simulations using AMESIM and MATLAB Simulink.

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Abbreviations

T e T e :

engine torque, N·m

T e. 0 :

engine torque at the initial time of the clutch slip engagement, N·m

T c1 :

the first(odd gear) clutch torque, N·m

T c2 :

the second(even gear) clutch torque, N·m

T o :

output shaft torque, N·m

T r :

road load torque, N·m

T r. 0 :

road load torque at the initial time of the clutch slip engagement, N·m

ω e :

engine speed, rad/s

ω c1 :

the first(odd gear) clutch speed, rad/s

ω c2 :

the second(even gear) clutch speed, rad/s

ω w :

wheel shaft speed, rad/s

ω s1 :

slip speed of the first(odd gear) clutch, rad/s

ω s1.0 :

slip speed of the first(odd gear) clutch at the initial time of the clutch slip engagement, rad/s

ω′s1.0 :

slip speed of the first(odd gear) clutch at the time when the optimization is conducted, rad/s

i 1 :

gear ratio of the first(odd gear) clutch, -

i 2 :

gear ratio of the second(even gear) clutch, -

i f :

final gear ratio, -

t :

time, s

t end :

clutch slip end point, s

t p :

past time from the beginning of the clutch slip engagement, s

a :

optimization variable, N·m

f :

tuning parameter, N·m

m v :

vehicle mass, kg

A f :

vehicle frontal area, m2

ρ a :

air density, kg/m3

C rr :

rolling resistance coefficient, -

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Acknowledgement

This research was partly supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) (No. 2017R1A2B4004116); and the BK21+program through the NRF funded by the Ministry of Education of Korea.

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  1. Mechanical Engineering, KAIST, Daejeon, 34141, Korea

    Jinrak Park & Seibum Choi

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  1. Jinrak Park
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  2. Seibum Choi
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Correspondence to Seibum Choi.

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Park, J., Choi, S. Optimization Method of Reference Slip Speed in Clutch Slip Engagement in Vehicle Powertrain. Int.J Automot. Technol. 22, 55–67 (2021). https://doi.org/10.1007/s12239-021-0007-5

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  • DOI: https://doi.org/10.1007/s12239-021-0007-5

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