Analysis of an employment of a gear ratio rate in CVT control system

Scientific Conference on Automotive Vehicles and Combustion Engines 2016

Grzegozek, W.^1 ; Szczepka, M.^1

Cracow University of Technology, al. Jana Pawla II 37, Kraków

31-864, Poland^1

关键词: Brake specific fuel consumption;    Construction solutions;    Continuously variable transmission;    Control strategies;    CVT efficiency;    Minimum value;    Optimization techniques;    Transient operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/148/1/012007/pdf
DOI  :  10.1088/1757-899X/148/1/012007

来源: IOP

【 摘 要 】

Continuously variable transmissions(CVTs) potentially ensure the selection of such a gear ratio that scooter fuel consumption can reach minimum value. Traditionally these CVT gearboxes are mechanically controlled, causing a gear ratio to be an engine revs function. This solution does not ensure optimum gear ratio. In this paper the solution for fuel optimal control problem is presented. The results obtained during brake stand research of scooter powertrains show the significant values of brake specific fuel consumption for the velocity that is maximum for a scooter according to highway code. With the introduction of CVT gearbox in which the selection of gear ratio can be controlled according to the worked out strategy the solution for fuel consumption problem is possible. Electromechanical actuators ensure the selection of a gear ratio independently of engine revs. Such type of construction solution makes working out the suitable control strategy that ensures decreasing of scooter fuel consumption possible. Presented strategies do not use precise optimization techniques. The CVT efficiency has a strong influence on transient operation. In the paper the control strategy owing to which fuel consumption decreases by over 40% is presented. The strategy was worked out on the basis of fuel consumption map for a defined scooter exploitation model. The possibilities of realization of the worked out strategy were tested on the brake test stand.