Experimental research of electro-hydraulic proportional valve of mechatronic control system of automatic gearbox

Abstract

To control the mechanisms of automobiles, tractors, building and road machines, the mechatronic automatic control systems are commonly used; one of their most important components is the electro-hydraulic proportional valve. Mechatronic systems allow to implement the sophisticated adaptive control algorithms, provide the high quality of functioning processes of controlled mechanisms and significantly increase the efficiency of production processes. The article deals with the experimental research of characteristics of electro-hydraulic proportional valve and the optimization of parameters of its control implemented by the microprocessor controller. Such valves are applied in automatic transmissions for the control of gear shift and working organs. The key diagram of created valve is given; its interaction with mechanisms of mechatronic systems is shown. The system functioning in implementation process of its work algorithm under control of the microprocessor controller is described. The article describes the results of experimental research of the electro-hydraulic proportional valve and technical solutions that allow to improve significantly its performance. The static and transient responses of the valve and its components are obtained. It is found that the form of transient response of proportional solenoid depends on the power source characteristic. With the use of direct current source, the transient response corresponds to aperiodic link, but with the use of controller, it corresponds to oscillatory one. The oscillatory character of transient response is caused by the control action of current controller. Current controller parameters influence the relative overshoot and the delay time of current rise in the proportional solenoid winding. The optimal parameters of current controller settings are defined. Influence of oscillation of control signal on the hysteresis of static response of control mechanism is investigated. Parameters of electro-hydraulic proportional valve that allow to estimate the possibility of its application for the control of working organs of machines are described.