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Integrated Control of Hydromechanical Variable Transmissions

Author

Listed:
  • Shujun Yang
  • Yong Bao
  • Xianzhi Tang
  • Xiaojuan Jiao
  • Deqing Yang
  • Qing Wang

Abstract

A hydromechanical variable transmission (HMT) has advantages of continuous variation and high efficiency. So it is one of the ideal transmissions of heavy vehicles. The continuous speed varying process involves speed governing in range and range shift. Integrated control strategy of the HMT is proposed in this paper. The algorithm of the asymmetric saturated incremental proportional integral derivative (PID) speed control strategy in range and range shift conditions are derived. And this paper presents the range shift logic and range shift control strategies. A controller model is built in Matlab Simulink and cosimulated with the model of vehicle equipped with a two-range HMT. The HMT prototype hardware-in-the-loop simulation (HILS) platform of the integrated control strategy is built. The HILS results show that the range shift process is smooth and speed fluctuation does not happen. In the throttle stable stage, the engine speed is adjusted to the near optimal speed, and its change rules are in accordance with simulation results. The integrated control strategy is reasonable.

Suggested Citation

  • Shujun Yang & Yong Bao & Xianzhi Tang & Xiaojuan Jiao & Deqing Yang & Qing Wang, 2015. "Integrated Control of Hydromechanical Variable Transmissions," Mathematical Problems in Engineering, Hindawi, vol. 2015, pages 1-11, September.
    • Handle: RePEc:hin:jnlmpe:290659
    DOI: 10.1155/2015/290659
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