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Detection method and detection device capable of preventing wrong installation of nitrogen and oxygen sensors

A technology of nitrogen and oxygen sensor and detection method, which is applied in the field of automobile control, can solve problems such as limited engine torque, impact on driving safety, and impact on SCR efficiency diagnosis, and achieve the effects of improving efficiency, eliminating ammonia leakage, and ensuring efficiency diagnosis

Inactive Publication Date: 2019-01-04
WEICHAI POWER CO LTD +1
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Problems solved by technology

In order to ensure the treatment effect of the SCR system, it is necessary to install nitrogen and oxygen sensors upstream and downstream of the catalytic converter in the SCR system. The NOx sensors installed upstream and downstream have the same shape, the same wire harness, the same probe, and even the shape of the connector. If the two sensors are reversely connected, it will have a serious impact on the control of urea injection and the diagnosis of SCR efficiency, and even cause engine torque limit to affect driving safety

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  • Detection method and detection device capable of preventing wrong installation of nitrogen and oxygen sensors
  • Detection method and detection device capable of preventing wrong installation of nitrogen and oxygen sensors

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[0054] 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.

[0055] Please refer to figure 1 and figure 2 , figure 1 A flow chart of the detection method for preventing nitrogen and oxygen sensor misinstallation provided by the present invention; figure 2 It is a schematic structural diagram of the detection device for preventing nitrogen and oxygen sensors from being installed incorrectly provided by the present invention.

[0056] In a specific embodiment, the detection method for pre...

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Abstract

The invention discloses a detection method and a detection device capable of preventing wrong installation of nitrogen and oxygen sensors. The detection method comprises the following steps: detectingupstream and downstream NOx values of an SCR (Selective Catalytic Reduction) system, and comparing the upstream and downstream NOx values to make a rough judgement; and reducing the injection amountof urea, and comparing integral values of the upstream and downstream NOx values within preset time to make a fine judgment. Thus, whether the upstream and downstream NOx sensors are installed wronglyor not can be judged effectively in order to ensure control of urea injection and diagnosis of the SCR efficiency, thereby ensuring the tail gas exhaust standard of a diesel engine.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a detection method for preventing wrong installation of nitrogen and oxygen sensors, and also relates to a detection device for preventing wrong installation of nitrogen and oxygen sensors including the detection method. Background technique [0002] With the continuous development of the economy, environmental issues have become the focus of people's more and more attention. The exhaust emissions of automobiles have become an important source of environmental pollution, especially the exhaust emissions of diesel engines. In order to reduce the environmental pollution caused by automobile exhaust, the state has issued Relevant emission regulations limit the standards of automobile exhaust emissions, and automobile manufacturers meet the requirements of automobile exhaust emissions by improving the combustion process of diesel engines. [0003] However, with the continu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/76
CPCG01F1/76
Inventor 李晓光安丽花郑志强赵龙龙
Owner WEICHAI POWER CO LTD
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