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Method and device for detecting air leakage in an engine exhaust system

An exhaust system and engine technology, applied in engine testing and measuring devices, by detecting the appearance of fluid at leak points, etc., can solve environmental pollution, difficult to detect in time, and unable to diagnose the exhaust pipeline of the exhaust gas treatment system Air leakage problems and other problems, to avoid environmental pollution, the method is accurate and reliable

Active Publication Date: 2022-01-21
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing OBD (on-Board Diagnostic) system cannot diagnose the air leakage problem of the exhaust pipe of the exhaust gas treatment system
The air leakage of the exhaust pipeline of the exhaust gas treatment system is generally detected through the user's visual observation and subjective feeling. Leakage will continue to cause environmental pollution
[0004] Moreover, the exhaust gas treatment system of the engine is generally equipped with an SCR (Selective Catalytic Reduction) system for processing nitrogen oxides. The urea injection amount in the SCR system is determined by the ECU (Electronic Control Unit, electronic control unit) Therefore, when the pipeline leaks, the amount of urea injected into the SCR system will be too high, which will lead to an increased risk of urea crystallization, further resulting in insufficient engine power and excessive fuel consumption. high problem

Method used

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  • Method and device for detecting air leakage in an engine exhaust system
  • Method and device for detecting air leakage in an engine exhaust system
  • Method and device for detecting air leakage in an engine exhaust system

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Embodiment 1

[0071] see figure 2 , a method for detecting air leakage in an engine exhaust system provided in an embodiment of the present application, comprising:

[0072] S201: Acquire the content of at least one gas component discharged into the atmosphere from the exhaust gas treatment system of the engine exhaust system when the engine is in a steady-state working condition.

[0073] In the engine exhaust system, the content of each gas component in the exhaust gas will be affected by the fluctuation of working conditions. In order not to affect the test results, it is necessary to obtain the gas content in the exhaust gas under steady-state working conditions.

[0074] The steady-state working condition refers to the working condition of the engine in a stable operation. The working condition can be characterized by a variety of parameters. When the main parameter values ​​used to characterize the working condition are basically constant, it can be characterized that the engine is i...

Embodiment 2

[0118] see Figure 4 , a method for detecting air leakage in an engine exhaust system provided in Embodiment 2 of the present application, comprising:

[0119] S401: Acquire the content of nitrogen oxides discharged into the atmosphere from the exhaust gas treatment system of the engine exhaust system when the engine is in a steady-state working condition.

[0120] As an example, the NOx sensor 17 located downstream of the SCR catalytic muffler 16 in the engine exhaust system is used to obtain the NO emitted into the atmosphere from the exhaust treatment system of the engine exhaust system under steady-state conditions. x content. In this example, S401 may specifically be: the NOx sensor 17 monitors the NOx emitted by the SCR catalytic muffler 16 x content, then, the monitored NO x The content is sent to the sensor ECU 18, and further, the engine ECU 10 can obtain the NO emitted into the atmosphere by the exhaust gas treatment system through the sensor ECU 18 x content.

...

Embodiment 3

[0147] see Figure 6 , a method for detecting air leakage in an engine exhaust system provided in Embodiment 3 of the present application, comprising:

[0148] S601: When the engine is in a steady state condition, acquire the ammonia content discharged into the atmosphere from the exhaust treatment system of the engine exhaust system.

[0149] As an example, this step can specifically be that an ammonia sensor is arranged downstream of the SCR catalytic muffler 16 in the engine exhaust system, and the ammonia sensor is used to obtain the exhaust gas discharged into the atmosphere from the exhaust gas treatment system of the engine exhaust system under steady-state conditions. ammonia content. The obtained ammonia content can be transmitted to the sensor ECU 18 , further, the engine ECU 10 can obtain the ammonia content discharged into the atmosphere by the exhaust gas treatment system through the sensor ECU 18 .

[0150] S602: When the OBD system does not diagnose an emissio...

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Abstract

The present application provides an engine exhaust system air leakage detection method and device, the method and device can determine the engine is in a steady state condition and the original emission of the engine is within the allowable original emission range, by comparing the Whether the actual value of at least one gas component discharged into the atmosphere by the exhaust gas treatment system used to characterize the effect of exhaust gas treatment meets the preset requirements to determine whether the engine exhaust system is leaking. Therefore, the detection method and device can be realized by equipment, thus, the method and device are accurate and reliable, and do not need manual operation. Therefore, with the help of the detection method and device, the air leakage problem of the engine exhaust system can be found in time, so that the problems of continuous environmental pollution, insufficient engine power, and excessive fuel consumption can be avoided.

Description

technical field [0001] The present application relates to the technical field of engine exhaust emissions, in particular to a method and device for detecting air leakage in an engine exhaust system. Background technique [0002] In order to reduce the emission of the engine and protect the environment, the exhaust gas discharged from the engine needs to be discharged into the environment through the exhaust gas treatment process of the exhaust gas treatment system. [0003] However, the existing OBD (on-Board Diagnostic, on-board diagnosis) system cannot diagnose the air leakage problem of the exhaust pipeline of the exhaust gas treatment system. The air leakage of the exhaust pipeline of the exhaust gas treatment system is generally detected through the user's visual observation and subjective feeling. Air leakage will continue to cause environmental pollution. [0004] Moreover, the exhaust gas treatment system of the engine is generally equipped with an SCR (Selective C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/10G01M3/04
CPCG01M15/102G01M3/04
Inventor 张希杰耿磊王军
Owner WEICHAI POWER CO LTD