Drive control system and control method of high-speed switching solenoid valve

Abstract

The present invention provides a drive control system and a control method for a high-speed switching solenoid valve, comprising: a controller, an I / O module, a signal generator, a voltage source, a conditioning circuit, a pressure sensor, a current sensor, and a solenoid valve; the controller The output end is connected with the signal generator, the voltage source and the solenoid valve; the pressure sensor is used to detect the oil pressure at the oil inlet of the solenoid valve, and its output end is connected with the conditioning circuit; the current sensor is used to detect the solenoid valve electromagnet The current in the coil, the output of which is connected to the conditioning circuit. It determines the movement state of the valve core through the current feedback signal, and then controls a single voltage source to output the corresponding variable voltage according to the state information during the movement of the valve core, and drives the solenoid valve to realize high-frequency opening and closing actions. When the pressure condition of the oil inlet changes, the controller can obtain the critical opening / closing current value according to the pressure of the oil inlet, so as to realize the automatic adaptation of the opening current and the pre-excitation current to the pressure change.

Description

technical field [0001] The invention belongs to the technical field of electromechanical-hydraulic integration, and in particular relates to a drive control system and a control method of a high-speed switching solenoid valve. Background technique [0002] Solenoid valves are widely used in various hydraulic systems. As an important hydraulic component in hydraulic systems, solenoid valves are generally used to control the direction, pressure and flow of fluids. With the increasing requirements of various precision hydraulic equipment for system response speed and control accuracy, on-off solenoid valves are developing in the direction of high-frequency response, fast switching, and low energy consumption. Among them, the high-speed switching solenoid valve combined with digital hydraulic technology is an important product of this development direction. It has a shorter dynamic response time, can realize the opening and closing of the valve at a higher speed, and improve the...

AI Technical Summary

Problems solved by technology

[0008] (2) For the occasions where the solenoid valve needs continuous switching, only using positive high voltage excitation cannot make the opening response time as short as possible

The difference in current variation under different pressure conditions makes it difficult to maintain consistency in the switching response time of the solenoid valve. At the same time, there is also a certain amount of redundancy in the coil current, which prolongs the switching response time.

[0010] (4) The control mode of the solenoid valve is limited to fully open and fully closed, which is relatively simple

That is, the conventional switching mode of the solenoid valve can only control the spool in two discrete states of fully open and fully closed, ignoring the possibility that the spool can work at a certain position between the open and closed states under the PWM control mode, which limits The flexibility of the solenoid valve control method

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