Air leakage detection method and device for engine aftertreatment and exhaust pipeline
An exhaust pipeline and engine technology, which is applied in the direction of measuring devices, machine/structural component testing, fluid tightness testing, etc., can solve the problem of engine exhaust pipeline air leakage, difficulty in checking for air leakage, and difficult detection of air leakage Or observed problems, to achieve the effect of strong applicability and low cost of air leakage detection
Active Publication Date: 2021-07-27
WEICHAI POWER CO LTD
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[0002]
The air leakage of the engine exhaust pipe, especially the internal air leakage of the post-processing is usually difficult to detect or observe, regardless of the vehicle or the bench test, there are such difficulties in the investigation of air leakage
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[0063] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0064] Such as Figure 1a As shown, it is a schematic diagram of an engine aftertreatment and exhaust pipeline air leakage detection method provided in the embodiment of the present application, including the following steps:
[0065] S101: Obtain a first parameter item collected by a sensor preset at an engine air inlet.
[0066] Wherein, the sensor preset on the air inlet of the engine includes a temperature sensor and a first pressure sensor. Correspondingly, the first parameter ...
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The invention discloses an air leakage detection method and device for engine aftertreatment and an exhaust pipeline. The method comprises: obtaining a first corresponding relation and a second corresponding relation through measurement in advance; determining that the engine is in a to-be-detected state under the conditions that the rotating speed of the engine is not smaller than a preset rotating speed lower limit threshold value, the circulating oil supply amount of the engine is not smaller than a preset circulating oil amount threshold value and the operation working condition of the engine is stable; and based on the first corresponding relation, the second corresponding relation, the target carbon loading capacity and the target exhaust flow, determining the first exhaust pressure; calculating the difference value between the first exhaust pressure and the target exhaust pressure, and obtaining a target value; and under the condition that the target value is larger than the preset threshold value, determining that air leakage occurs in the engine aftertreatment and exhaust pipeline. By means of the scheme, the air leakage state of the engine post-processing and exhaust pipeline can be effectively detected, the engine post-processing and exhaust pipeline does not need to be modified, the air leakage detection cost is low, and the applicability is high.
Description
technical field [0001] The present application relates to the field of engines, in particular to a method and device for detecting air leakage of engine aftertreatment and exhaust pipelines. Background technique [0002] The air leakage of the engine exhaust pipe, especially the internal air leakage of the post-processing is usually difficult to detect or observe, regardless of the vehicle or the bench test, there are such difficulties in the investigation of air leakage. [0003] For this reason, how to effectively detect the air leakage state of the engine aftertreatment and the exhaust pipeline has become an urgent problem to be solved in this field. Contents of the invention [0004] The present application provides a method and device for detecting air leakage of engine aftertreatment and exhaust pipelines, with the purpose of effectively detecting the air leakage state of engine aftertreatment and exhaust pipelines. [0005] In order to achieve the above object, the...
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Login to View More IPC IPC(8): G01M3/28
CPCG01M3/2815Y02T10/40
Inventor 韩金辉代子阳潘发存钟跃兰
Owner WEICHAI POWER CO LTD