Proportional electromagnetic valve driving method based on PWM

A technology of proportional solenoid valve and driving method, which is applied in the direction of valve details, valve devices, engine components, etc., can solve the problems of long adjustment rise time, inability to respond quickly, and slow adjustment, so as to shorten the adjustment time, save the rise time, achieve rapid results

Active Publication Date: 2018-12-11
GUANGXI LIUGONG MASCH CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a proportional solenoid valve driving method with fast adjustment and fast response for the problems of long rising time, slow adjustment and inability to respond quickly in the closed-loop adjustment of the PWM control driving current of the existing proportional solenoid valve.

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  • Proportional electromagnetic valve driving method based on PWM
  • Proportional electromagnetic valve driving method based on PWM
  • Proportional electromagnetic valve driving method based on PWM

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Embodiment Construction

[0013] The specific implementation will be described below in conjunction with the accompanying drawings.

[0014] Such as image 3 As shown, the controller controlling the proportional solenoid valve usually uses PWM (pulse width modulation) to adjust the current. That is to say, the controller outputs a rectangular wave voltage at a certain frequency, wherein in one cycle, the cycle is T, the high level time is Tx, then the duty ratio is D=Tx / T, and the average current I in the cycle T= P*D / R, P is the driving voltage loaded on both ends of the proportional solenoid valve, and R is the impedance of the proportional solenoid valve. The impedance of the proportional solenoid valve will change with frequency (1 / T) and hydraulic oil temperature, but the fluctuation will not be too large, the maximum fluctuation is 20% (the fluctuation of different valve impedance values ​​will be different), so through the formula I=P*D / The calculated current of R will not be too accurate. T...

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Abstract

The invention relates to a control method of a proportional electromagnetic valve. To solve the problem that a PWM control driving current closed-loop adjusting rising time of an existing proportionalelectromagnetic valve is long, adjustment is slow, and fast responding is incapable, the proportional electromagnetic valve driving method based on PWM is provided, the impedance value R of the proportional electromagnetic valve is obtained, the driving voltage P loaded on the proportional electromagnetic valve is detected, whether the target current changes or not is detected, if the target current Ix changes, calculating the estimated duty ratio D= K*R*Ix / P, and the controller outputs PWM signals to the proportional electromagnetic valve according to the estimated duty ratio D; the actual current Ic flowing through the proportional electromagnetic valve is detected and compared with the target current Ix, the duty ratio is adjusted through closed-loop control until the difference valuebetween the actual current IC and the target current Ix is smaller than or equal to the error value. According to the control method, most of control rising time is saved, the control rapidity is realized, and the adjusting time is greatly shortened.

Description

technical field [0001] The invention relates to a driving method of a proportional solenoid valve, more specifically, to a driving method of a proportional solenoid valve based on PWM. Background technique [0002] Proportional solenoid valves are widely used in the field of engineering machinery hydraulic control technology. Proportional solenoid valves used in construction machinery have large inductive reactance and good impact resistance. Generally, they are controlled by PID current closed-loop control, that is, the controller sends a PWM signal to the proportional solenoid valve, and then Collect its current back to compare whether it reaches the expected current, if not, continue to adjust until the actual sampling current and the expected current are within the error range. Since construction machinery adopts most of the hydraulic control, the lagging link is relatively large, and the requirements for control are different. Some use PID control to meet the requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/06
CPCF16K31/0675
Inventor 李璘蔡登胜孙金泉江恒
Owner GUANGXI LIUGONG MASCH CO LTD
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