Method for detecting blockage of heating electromagnetic valve of urea box and engine

A technology of heating solenoid valve and detection method, applied in the direction of internal combustion piston engine, engine components, combustion engine, etc., can solve the problems of misjudgment, slow change of urea tank solution temperature and temperature, etc., and achieve the effect of reducing the misjudgment rate

Active Publication Date: 2021-11-26
WEICHAI POWER CO LTD
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Problems solved by technology

However, when the engine speed is low, the coolant flow through the urea tank is small, and the temperature of the urea tank solution and temperature change will be slow, which may lead to misjudgment

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  • Method for detecting blockage of heating electromagnetic valve of urea box and engine

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Embodiment Construction

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a s...

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Abstract

The invention discloses a method for detecting blockage of a heating electromagnetic valve of a urea box and an engine, and relates to the technical field of engines. The urea box is heated through cooling liquid, and the heating electromagnetic valve is used for controlling whether the cooling liquid communicates with the urea box or not. The method for detecting blockage of the heating electromagnetic valve of the urea box comprises the following steps: opening the heating electromagnetic valve, and heating the urea box; detecting a first temperature rise rate of a urea solution in the urea box; if the first temperature rise rate is smaller than the minimum temperature rise rate, the flow of the cooling liquid is increased; detecting a second temperature rise rate of the urea solution in the urea box; if the second temperature rise rate is smaller than the minimum temperature rise rate, judging that the heating electromagnetic valve is blocked. According to the method for detecting blockage of the heating electromagnetic valve of the urea box, the phenomenon of slow temperature rise or no temperature rise of the urea box caused by small flow of the cooling liquid is eliminated, and the misjudgment rate is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method for detecting blockage of a urea tank heating solenoid valve and an engine. Background technique [0002] In order to ensure that the SCR system can be used normally in winter, the main solution currently adopted is to heat and insulate the urea storage unit and the corresponding pipelines. The heating methods of the urea tank and the urea supply system are generally different. Currently, the urea tank is heated by coolant flow. The heating method is to conduct convective heat exchange with the urea solution through the heating pipeline. When the ECU judges that the urea needs to be thawed (the temperature is lower than the set value) through the temperature sensor of the urea tank and the ambient temperature sensor, the ECU will open the heating solenoid valve to allow the engine coolant with a higher temperature to flow into the heating pipeline of the urea tank to mat...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/2066F01N3/208F01N11/00F01N2610/10Y02T10/40
Inventor 陈月春李素婷王继磊刘帅邵宏鑫
Owner WEICHAI POWER CO LTD
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