Optimization of vehicle acceleration process, taking into account the mode of operation of its engine

Automotive vehicles are widely used in agriculture for various works. The technique of a choice of optimum gear ratio of a continuously variable transmission of vehicle taking into account the modes of movement and work of its engine is offered. With the purpose of efficient use of engine power resources and implementation of the required indicators of traction-speed and fuel-economic properties of the automobile, manufacturers are trying to impart certain properties to the transmission design that will ensure the most complete coordination of their joint work. The efficiency of the process of coordinating the joint operation of the engine and transmission, determined by the conformity of the designed vehicle to its functional purpose, largely depends on the design methods used. To improve this process, it is necessary to use methods of optimal design. Analytical expressions for the equation of traction balance and, correspondingly, the mathematical model of the vehicle acceleration, depending on the tasks, can and should become complicated. This is indisputable and is determined only by the permissible error in the calculations in each particular case. The paper shows that the regularity of the change in the transmission ratio of a continuously variable transmission can be controlled, and, most importantly, optimal, depending on the mode of vehicle movement. The modern level of development of automation and control means allows to implement this process in practice. The results of calculating the traction-dynamic and fuel-economic parameters of vehicle with continuously variable transmission, the gear ratios of which changed during the movement in accordance with the proposed procedure, in comparison with the actual prototype, confirmed the previously accepted optimization hypothesis and lead to recommendation of the application of this technique in practice when choosing the gear ratios of a continuously variable transmission, depending on the driving mode of the vehicle.

vehicle, continuously variable transmission, variator, acceleration, gear ratio