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Research Papers

A Systematic Approach for Dynamic Analysis of Vehicles With Eight or More Speed Automatic Transmission

[+] Author and Article Information
Sangchul Lee

Transmission Test Department,
Hyundai-Motor Company,
Hwasung-Si,
Kyunggi-Do, 445-706 South Korea

Yi Zhang, Dohoy Jung, Byungchan Lee

Department of Mechanical Engineering,
University of Michigan-Dearborn,
Dearborn, MI 48128

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received May 28, 2013; final manuscript received March 4, 2014; published online June 12, 2014. Assoc. Editor: Shankar Coimbatore Subramanian.

J. Dyn. Sys., Meas., Control 136(5), 051008 (Jun 12, 2014) (11 pages) Paper No: DS-13-1216; doi: 10.1115/1.4027169 History: Received May 28, 2013; Revised March 04, 2014

In this study, a dynamic model of a vehicle with eight or more speed automatic transmission (A/T) has been developed for the analysis of shift quality and dynamic behavior of the vehicle during shift events. Subsystem models for engine, torque converter, automatic transmission, drivetrain, transmission control unit (TCU), and vehicle are developed and integrated with signal information interface. The subsystems included in the model were carefully selected to improve the accuracy of the model by comparing the simulation results with the test data. The systematic modeling approach based on matrix operation proposed in the study enables calibrating and fine-tuning the transmission control unit for shift quality in a virtual vehicle environment. The model presented in the study is validated with the vehicle test data and the comparison shows very good agreement. This paper presents a generalized modeling methodology for multiratio automatic transmissions that require both direct and indirect shifts. The model developed in the study provides a valuable analytical tool for the calibration and tuning of the transmission control unit by allowing quantitative analysis on the dynamic behavior and the performance metrics of an automatic transmission.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Eight-speed automatic transmission layout

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Fig. 2

Dynamic model for A/T equipped vehicle

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Fig. 3

Matlab Simulink model for A/T equipped vehicle

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Fig. 4

Input shaft element in dynamic model

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Fig. 5

Boundary conditions

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Fig. 6

State variable matrix

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Fig. 7

Three states during gear shift

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Fig. 8

Shift progress using case definition

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Fig. 9

Coefficient matrix of governing equations

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Fig. 10

Coefficient matrix modification for the second gear

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Fig. 11

Selection of spring-damper system

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Fig. 12

Comparison between control duty and measured pressure

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Fig. 13

Clutch stroke-torque model calculation result

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Fig. 14

Engine torque model interface

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Fig. 15

Engine torque reduction in simulation

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Fig. 16

PID effect on power-on up 2 to 3 shift events

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Fig. 17

Output result of shift decision model

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Fig. 18

Output result comparison between model and vehicle

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Fig. 19

Input duty comparison between model and vehicle (2–3 shift)

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Fig. 20

Output result comparison between model and vehicle

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Fig. 21

Input duty comparison between model and vehicle (1–2 shift)

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Fig. 22

Output result comparison between model and vehicle (8→3)

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Fig. 23

Input duty comparison between model and vehicle (8–3 shift)

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Fig. 24

Output result comparison between model and vehicle (8→5)

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Fig. 25

Input duty comparison between model and vehicle (8–5 shift)

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