• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2017, Vol. 53 ›› Issue (4): 105-113.doi: 10.3901/JME.2017.04.105

• Orginal Article • Previous Articles     Next Articles

Clamping Force Control Strategy of Continuously Variable Transmission Based on Extremum Seeking Control of Sliding Mode

HAN Ling1, AN Ying2, SOHEL Anwar3, ZHAO Xilu4   

  1. 1. School of Mechatronic Engineering, Changchun University of Technology, Changchun 130012;
    2. College of Automotive Engineering, Hunan University, Changsha 410000;
    3. College of Mechanical Engineering, Purdue University, Indiana Indianapolis 46202, USA;
    4. College of Mechanical Engineering, Saitama Institute of Technology, Fukaya 369-0293, Japan
  • Online:2017-02-20 Published:2017-02-20

Abstract:

A control strategy based on extremum seeking of sliding mode is proposed to optimize conventional clamping force control of continuously variable transmission (CVT). The nonlinear and discrete mathematical model of slip rate is built to prove the special relationship between transmission efficiency of CVT and slip ratio of metal belt, and the extremum seeking of sliding mode controller is designed. The optimal regions of slip ratio are searched with this controller. The optimal slip ratio is got by concussion filtered interference signal. The critical value of system instability is the constraint object which shows the control system has good robustness by strong anti-interference ability of the driver torque. In order to verify the effectiveness and feasibility of clamping force control strategy, simulation platform and real vehicle test platform is established. Simulation and real vehicle verification results show that transmission efficiency is improved by 7.98%-9.98%, fuel efficiency is improved by 1.15%, and fuel consumption is reduced by about 5.54%. By comparisons between extremum seeking of sliding mode control and conventional clamping force control, the control strategy algorithm proposes a new method to meet the needs of improving fuel economy requirement and optimization space.

Key words: extremum seeking of sliding mode, slip ratio, transmission efficiency, continuously variable transmission