A pwm control method to improve the proportional characteristic of high-speed switching solenoid valve

Abstract

The invention discloses a PWM (Pulse Width Modulation) control method of improving the proportion property of a high-speed on-off solenoid valve. The PWM control method is characterized in that when the high-speed on-off solenoid valve is used for proportion control, the frequency, high level and low level parameters of a PWM control signal of the high-speed on-off solenoid valve are set so as to improve the proportion control function of the high-speed on-off solenoid valve. The PWM control method has the beneficial effects that the pressure fluctuation range of the high-speed on-off solenoid valve can be effectively reduced, the proportion regulation range of the high-speed on-off solenoid valve and the effective control duty ratio range of the PWM are widened, and the proportion property of the high-speed on-off solenoid valve is improved.

Description

technical field [0001] The invention relates to a driving method of a high-speed switching solenoid valve, in particular to a PWM control method for improving the proportional characteristic of the high-speed switching solenoid valve. Background technique [0002] The basic working principle of the high-speed switching solenoid valve is based on the external input pulse width modulation (Pulse Width Modulation, PWM) control signal to control the electromagnet in the valve to generate or eliminate the electromagnetic suction force, so as to drive the valve core to move back and forth, so that the valve port is in the open state. In the closed state, the on-off control of the liquid flow at the valve port is realized. The high-frequency PWM control signal can realize the proportional control function of the valve port opening similar to the proportional valve, which is called the proportional function characteristic of the high-speed switching solenoid valve. [0003] Domestic...

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Problems solved by technology

[0004] The parameters of the high-speed switching solenoid valve structure mainly include coil resistance, coil turns, spring stiffness, initial working air gap, etc. Under the premise of ensuring that the high-speed switching valve is normally opened and closed and has a proportional control function, the coil turns and coil resistance The parameters mainly affect the working range of the effective duty ratio, and have little effect on the proportional control range and effective duty ratio range of the solenoid valve. Changing the spring stiffness and initial working air gap parameters can broaden the proportional control range and effective control ratio of the solenoid valve to a certain extent. Duty ratio range, but little improvement

Therefore, the appropriate adjustment of these structural parameters has little effect on the widening of the proportional control range and effective control duty cycle range of the high-speed switching solenoid valve, and the design parameters of the high-speed switching solenoid valve need to be modified, so the practicability is not strong.

[0005] Therefore, the current proportional control function of the high-speed switching solenoid valve has the disadvantages of a small proportional controllable range and a small effective duty cycle range. It is difficult to significantly improve its proportional characteristics by adjusting the structural parameters of the solenoid valve, and the cost is high. The adjustment process is complicated, which is not conducive to the promotion and application of products

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