Optimization of gear ratio of variable mechanical gearboxes

Abstract

The effectiveness of the coordination process of the "engine-transmission" system is largely determined by the functional purpose of the car being designed. The solution to this problem is possible by choosing the optimal transmission parameters. Using a continuously variable transmission will make this process manageable. However, optimization is always performed according to a certain criterion. You can use its dynamic performance and fuel economy as an optimization criterion. The article presents a mathematical model for determining the current gear ratios of a continuously variable transmission of a vehicle depending on its mode of movement. The dependence of the transmission ratio of the vehicle on speed allowed us to find the mode of movement of the car with the minimum acceleration time. The dependence of the transmission ratio of the vehicle on the engine speed allowed us to find the driving mode with minimal fuel consumption. The recommendations received by the authors on the choice of transmission ratios can be used in the design of the control system. Automation of control will allow optimizing the pattern of change in the gear ratio of a continuously variable transmission depending on the mode of movement of the vehicle.