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Dynamic characteristic identification of PWM solenoid valve for automatic transmission

자동변속기용 펄스폭변조 솔레노이드 밸브의 동특성 식별

  • 정규홍 (대진대학교 기계설계공학과) ;
  • 조백현 (현대자동차(주) 중앙연구소T/M 시험2팀) ;
  • 이교일 (서울대학교 기계설계학과)
  • Published : 1997.10.01

Abstract

As most of today's automatic transmissions in passenger car adopt a electro-hydraulic control system, the role of electronically controlled solenoid valves occupies an important position and it is essential to predict solenoid transient characteristics in order to design and evaluate the performance of the hydraulic control system. However, in general, both the magnetic and electrical parameters f the solenoid system are hardly known and it is not easy to model this section with moderate complexity although mechanical system could be developed using the classical second order system. This paper presents a dynamic modelling technique of a solenoid valve, that is controlled by pulse width modulation for an automatic transmission, in terms of system identification theory. In nonlinear computer simulation, it is shown that the identified systems which produce magnetic force to input duty cycle for various excitation signals predict the static and dynamic performance very well near the operating point and in experiment conducted to confirm the validity of identification theory for PWM solenoid valve, we find that there is a good agreement between the experimental data and simulation result. Hence, this model can be utilized in the development of pressure control system with PWM solenoid valve.

Keywords

Automatic Transmission;Pulse Width Modulation;Solenoid Valve;System Identification

References

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