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Urea box electromagnetic valve fault diagnosis method, device and system

A technology of fault diagnosis and urea solution tank, which is applied in the direction of diagnosis device of exhaust treatment device, electric control of exhaust treatment device, exhaust treatment, etc. There are no problems such as electromagnetic connection reverse correlation diagnosis logic, etc., to achieve the effect of reducing heat loss, reducing fuel consumption, and saving costs

Inactive Publication Date: 2020-11-17
WEICHAI POWER CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to at least solve the problem that there is no electromagnetic connection reverse correlation diagnosis logic in the existing urea tank heating system
The temperature rise of the urea tank is unreliable, and the cause of the fault cannot be accurately located, and troubleshooting is time-consuming and laborious.

Method used

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  • Urea box electromagnetic valve fault diagnosis method, device and system
  • Urea box electromagnetic valve fault diagnosis method, device and system

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Embodiment Construction

[0038] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] It should be understood that terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated fea...

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Abstract

The invention belongs to the technical field of vehicle faults, and particularly relates to a urea box electromagnetic valve fault diagnosis method, device and system. The urea box electromagnetic valve fault diagnosis method comprises the following steps of obtaining the current temperature rise rate of a urea box; controlling an electromagnetic valve to open according to the condition that the current temperature rise rate of the urea box is greater than a set temperature rise rate, and judging the change state of the current temperature rise rate of the urea box; judging that the electromagnetic valve has a reverse connection fault according to the fact that the current temperature rise rate of the urea box is in a changed state; and judging that the electromagnetic valve has a stagnation fault according to the fact that the current temperature rise rate of the urea box is in an unchanged state. According to the urea box electromagnetic valve fault diagnosis method, the electromagnetic valve is controlled to be opened according to the fact that the temperature rise rate of the urea box is larger than the set temperature rise rate, the fault of the electromagnetic valve is judgedas the reverse connection fault or the stagnation fault according to the change state of the current temperature rise rate of the urea box, troubleshooting is rapid, and the faults can be found and solved in advance.

Description

technical field [0001] The invention belongs to the technical field of vehicle faults, and in particular relates to a method, device and system for fault diagnosis of a solenoid valve of a urea tank. Background technique [0002] In order to ensure the normal operation of the post-processing SCR system in a cold environment, it is necessary to heat the urea tank with engine coolant to defrost and heat the urea solution to ensure the normal supply of the urea solution. The heating function only works when the temperature of the urea tank is lower than the set value. When heating, the electromagnetic valve is opened, and the coolant with a higher temperature flows into the urea tank, and heats the urea solution in the urea tank through heat exchange. In the non-heating state, the solenoid valve is closed, the coolant cannot flow into the urea tank, and the heating is terminated. [0003] The existing urea tank heating system does not have electromagnetic connection reverse c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N11/002F01N2610/02Y02T10/40
Inventor 解家报孙民侯健鹏李伦
Owner WEICHAI POWER CO LTD
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