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A kind of control method of air solenoid valve of urea pump

A technology of air solenoid valve and solenoid valve, which is applied in the direction of using electric device flow control, valve operation/release device, valve device, etc., and can solve the problems of high heat generation of air solenoid valve and high heat generation of air solenoid valve of urea pump , to achieve the effect of reducing work energy consumption, avoiding the decline of service life, and solving excessive heat generation

Inactive Publication Date: 2018-03-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention aims at the problem of excessive heat generation of the air solenoid valve of the urea pump, and provides a method for flexibly controlling the current value of the air solenoid valve in the process of opening and maintaining the air solenoid valve, so as to solve the problem of the air solenoid valve generating heat. The problem of excess heat

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  • A kind of control method of air solenoid valve of urea pump
  • A kind of control method of air solenoid valve of urea pump
  • A kind of control method of air solenoid valve of urea pump

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] In this embodiment, the PWM signal module adopts the single-chip microcomputer MC-S9S08DZ60 with the air solenoid valve opening signal acquisition input port PTAO and the PWM signal output port PTD7. The air solenoid valve of the urea pump is the action actuator.

[0029] according to figure 1 Connection line, PTA0 of MC-S9S08DZ60 is connected to the acquisition signal, PTD7 is connected to the G pin of IRF540, the S pin of IRF540 is grounded, and the D pin of IRF540 is connected to one end of the air solenoid valve of the urea pump. The other end of the air solenoid valve is connected to a DC power supply 24V switching power supply.

[0030] When the air solenoid valve is opened, the required electromagnetic force is large, and the required drive current is also large, and the solenoid valve opening threshold is 1.5A. In the PWM con...

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Abstract

The invention discloses a control method of an air solenoid valve of a urea pump. A PWM signal module, a driving current control module, a power input module and a movement execution module are used. The PWM signal module acquires a starting signal of the air solenoid valve and sends pulses in different duty ratios to the driving current control module, the driving current control module controls the intensity of current passing through the air solenoid valve according to the duty ratios of the pulses, and therefore control over the intensity of the current in the starting stage of the air solenoid valve and the intensity of the current in the starting state maintenance stage of the air solenoid valve is achieved, and a feasible scheme is provided in order to solve the problem that the heat quantity is overhigh in the working process of the air solenoid valve of the urea pump in the aspect of the power-on time.

Description

technical field [0001] The invention belongs to the technical field of SCR exhaust post-treatment, and more specifically relates to a method for controlling peak current and holding current of an air solenoid valve of a urea pump. Background technique [0002] In the use of the urea pump air solenoid valve, such as image 3 Middle curve 1, the traditional control method is to give the air solenoid valve a current pulse with a certain duty ratio, so that the air solenoid valve is sufficient to perform the opening and closing action, and maintain the open state of the air solenoid valve with this current. [0003] The electromagnetic force of the urea pump air solenoid valve in steady state operation: [0004] [0005] Among them: N is the number of turns of the coil; I is the coil current; μ is the vacuum permeability; S is the cross-sectional area of ​​the magnetic circuit; K f is the flux leakage coefficient; δ is the air gap length. It can be seen that the required el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D7/06F16K31/06
CPCF16K31/0675
Inventor 刘兴华范长买岳广照
Owner BEIJING INSTITUTE OF TECHNOLOGYGY