Optimization Transmission Efficiency with Driver Intention for Automotive Continuously Variable Transmission under Slip Mode

• Published in: Chinese journal of mechanical engineering Vol. 34; no. 1; pp. 1 - 17
• Main Authors: Han, Ling, Zhang, Hui, Fang, Ruoyu, Liu, Hongxiang
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.12.2021; Springer Nature B.V; SpringerOpen
• Edition: English ed.
• Subjects: Advanced Transportation Equipment; Automobiles; Continuously variable; Control systems; Controllers; Drive intention; Driver behavior; Efficiency; Electrical Machines and Networks; Electronics and Microelectronics; Engineering; Engineering Thermodynamics; Fuzzy control; Heat and Mass Transfer; Instrumentation; Internal combustion engines; Machines; Manufacturing; Mechanical Engineering; Model predictive control; Optimization; Original Article; Power Electronics; Predictive control; Processes; Robust control; Slip; Slip mode; Theoretical and Applied Mechanics; Torque; Transmission efficiency; Transmissions (automotive); V-belt continuously variable transmission; Model predictive control; Slip mode; V-belt continuously variable transmission; Drive intention; Transmission efficiency
• ISSN: 1000-9345; 2192-8258
• DOI: 10.1186/s10033-021-00620-0

This study proposes and experimentally validates an optimal integrated system to control the automotive continuously variable transmission (CVT) by Model Predictive Control (MPC) to achieve its expected transmission efficiency range. The control system framework consists of top and bottom layers. In the top layer, a driving intention recognition system is designed on the basis of fuzzy control strategy to determine the relationship between the driver intention and CVT target ratio at the corresponding time. In the bottom layer, a new slip state dynamic equation is obtained considering slip characteristics and its related constraints, and a clamping force bench is established. Innovatively, a joint controller based on model predictive control (MPC) is designed taking internal combustion engine torque and slip between the metal belt and pulley as optimization dual targets. A cycle is attained by solving the optimization target to achieve optimum engine torque and the input slip in real-time. Moreover, the new controller provides good robustness. Finally, performance is tested by actual CVT vehicles. Results show that compared with traditional control, the proposed control improves vehicle transmission efficiency by approximately 9.12%–9.35% with high accuracy.