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Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation)

A proportional solenoid valve and driving method technology, applied in valve details, valve devices, engine components, etc., can solve the problems of proportional solenoid valve secondary pressure fluctuation, multiple power loss, increasing solenoid valve hysteresis loss and eddy current loss, etc. Achieve stable output pressure, reduce power consumption, and prevent spool sticking

Inactive Publication Date: 2015-02-11
SANY HEAVY MACHINERY
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Problems solved by technology

[0004] 1) If the PWM frequency driving the proportional solenoid valve is too low, the secondary pressure of the proportional solenoid valve will fluctuate with the PWM pulse;
[0005] 2) If the frequency of the PWM signal driving the proportional solenoid valve is too high, the response time of the solenoid valve will be reduced, and excessive power loss will be generated, which will increase the hysteresis loss and eddy current loss of the solenoid valve

Method used

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  • Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation)
  • Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation)
  • Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation)

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Embodiment Construction

[0023] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] The theoretical basis of this application is: in view of the fact that the proportional electromagnet belongs to the excitation type electro-mechanical conversion device, the control current generated by the embedded controller generates magnetic flux in the proportional electromagnet coil to push the armature to displace, and the electromagnetic force received by the valve core has the same The current fluctuates at the same frequency. Comprehensive consideration of the electromechanical hydraulic system of the proportional solenoid valve shows that part of the transfer function of the mechanical system can be used as a low-pass second-order filter, while the transfer function of the elec...

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Abstract

The invention discloses a proportional electromagnetic valve driving method and system based on PWM. The method comprises the following steps: presetting the corresponding relation of duty cycles and frequency values, wherein the distribution rule of the frequency values in the corresponding relation is that the frequency value corresponding to a middle duty cycle is larger than the frequency values corresponding to the duty cycles on the two sides; according to the corresponding relation, determining the frequency value corresponding to a target duty cycle; according to the target duty cycle and the frequency value corresponding to the target duty cycle, generating a PWM driving signal, and driving a proportional electromagnetic valve by using the PWM driving signal. The method can enable the electromagnetic valve to output stable secondary pressure, the power loss of the electromagnetic valve is lower, and the slight flutter of the valve element of the electromagnetic valve is retained, so that the valve element is prevented from being clamped.

Description

technical field [0001] The invention relates to the field of proportional solenoid valve driving, in particular to a PWM-based proportional solenoid valve driving method and system. Background technique [0002] The most ideal driving signal for proportional solenoid valves is direct current with small dither. However, due to system complexity and cost considerations, embedded control systems for excavators and other construction machinery usually use Pulse Width Modulation (PWM) to drive proportional solenoid valves. PWM includes two types of duty cycle and frequency. Information: The required voltage value can be obtained by adjusting the duty cycle; and the selection of the PWM frequency has a great influence on the stability of the secondary pressure of the proportional solenoid valve and its own power consumption. [0003] At present, most of them use fixed-frequency PWM to drive proportional solenoid valves, which have the following disadvantages: [0004] 1) If the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/06
CPCF16K31/0675
Inventor 汪春晖王杏康健
Owner SANY HEAVY MACHINERY
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