The Analysis of Applying CVT Gear Ratio Rate Control for Scooter Efficiency Improvement
Keywords:CVT, gear ratio rate, control strategy, rubber V-belt, drivability
AbstractContinuously variable transmissions (CVTs) potentially ensure the selection of such a gear ratio that scooter fuel consumption can reach a minimum value. Traditionally, scooter 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 tests of scooter powertrains, show the significant values of brake specific fuel consumption for the velocity that is maximum for a scooter (as stated in The Highway Code). With the introduction of a 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 found. 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, which ensures decreasing of scooter fuel consumption, possible. Presented strategies do not use precise optimization techniques. The CVT efficiency has a strong influence on a transient operation. In the paper, the control strategy that results in fuel consumption decrease of over 15% is presented. The strategy was worked by fuel consumption map for a defined scooter exploitation model. The ways of realization of the worked out strategy were tested on the brake test stand.
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