A high dynamic control system and method for solenoid valves based on voltage pulse width modulation technology

Abstract

The invention discloses a high dynamic control system of an electromagnetic valve based on voltage pulse width modulation technology and a method thereof. The system includes a duty ratio controller, a voltage source, a current detector, a solenoid valve, a pressure sensing system, and a controller; by keeping the coil current at a state slightly smaller than the opening current before the expected start time of the solenoid valve, the solenoid valve Before the expected closing time of the valve, it remains in a state slightly larger than the closing current, which greatly reduces the opening and closing delay time. In the opening stage, the current rises rapidly, reducing the movement time in the opening stage; in the closing stage, the current drops rapidly to 0, reducing the movement time in the closing stage.

Description

technical field [0001] The invention relates to the field of electromagnetic valve control, in particular to a high dynamic control system and method for an electromagnetic valve based on voltage pulse width modulation technology. Background technique [0002] In the solenoid valve, the number of ampere turns and the working air gap have the greatest influence on the electromagnetic force of the electromagnet. Ampere-turns is the product of the number of turns of the coil and the current in the single-turn coil. When the magnetic flux is not saturated, the greater the current, the greater the electromagnetic force; the smaller the working air gap, the greater the electromagnetic force. Since the solenoid valve is often opened when the working air gap in the electromagnet is the largest, and when it is closed is often the time when the working air gap in the electromagnet is the smallest, so the opening current is larger than the closing current. [0003] In the field of hi...

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Problems solved by technology

[0004] However, this control method has some shortcomings

First of all, multiple voltage sources complicate the working conditions of the system and cause large errors

Secondly, the switching time of each segment voltage in this control method is determined according to the relationship between the actual current value and the theoretical current value in the system circuit, without considering the working stroke of the solenoid valve spool

In the high-speed solenoid valve, because the dynamic characteristics of the solenoid valve are weak, and the current dynamic characteristics of the electromagnet are better, this method may cause the solenoid valve spool to not reach the expected working stroke and the voltage source to switch in advance

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