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Exhaust gas reflux fault monitoring method and device

A technology of exhaust gas recirculation and fault monitoring, applied in exhaust gas recirculation, electrical control, charging system, etc., can solve problems such as combustion explosion, explosion, cooling, etc., to achieve the effect of ensuring safety

Active Publication Date: 2019-01-29
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the gas engine is running and the pressure in the intake manifold is higher than the pressure in front of the turbine, if the EGR valve 102 is opened, the mixed gas in the intake pipe will flow back into the EGR system. If the mixed gas flows back through the cooling device 101 and Combustion and explosion problems may occur when high-temperature exhaust gas meets
In addition, if the cooling effect of the cooling device 101 decreases and the high-temperature gas cannot be cooled, the mixed gas may meet the high-temperature exhaust gas in the cooling device 101, which may cause the mixed gas to burn or even explode.

Method used

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  • Exhaust gas reflux fault monitoring method and device

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1 of the present application provides a method for monitoring an exhaust gas recirculation fault, which will be described in detail below with reference to the accompanying drawings.

[0043] see figure 2 , which is a flow chart of a method for monitoring an exhaust gas recirculation fault provided in Embodiment 1 of the present application.

[0044] The method described in the embodiment of the present application is applied to a gas engine with an exhaust gas recirculation system EGR, and the EGR is equipped with a Venturi tube and an EGR valve, and the method includes the following steps:

[0045] S201: Obtain the difference between the pressure at the inlet of the Venturi tube and the pressure at the throat of the Venturi tube.

[0046] see image 3 , which is a schematic structural diagram of the Venturi tube provided in Embodiment 1 of the present application.

[0047] exist image 3 In the Venturi tube structure shown, the direction of the arrow i...

Embodiment 2

[0055] Embodiment 2 of the present application provides another exhaust gas recirculation fault monitoring method, which will be described in detail below with reference to the accompanying drawings.

[0056] see Figure 4 , which is a flow chart of another EGR fault monitoring method provided in Embodiment 2 of the present application.

[0057] The method described in the embodiment of the present application is as follows:

[0058] S401: Periodically acquire the pressure at the inlet of the Venturi tube and the pressure at the throat of the Venturi tube according to a preset acquisition period.

[0059] It should be noted that the difference between the pressure at the inlet of the Venturi tube and the pressure at the throat of the Venturi tube can be obtained by a differential pressure sensor; the pressure at the inlet of the Venturi tube can also be obtained respectively by a pressure sensor and the pressure at the throat of the Venturi tube, and then convert the pressur...

Embodiment 3

[0067] Based on the exhaust gas recirculation fault monitoring method provided in the above embodiments, Embodiment 3 of the present application further provides an exhaust gas recirculation fault monitoring device, which will be described in detail below with reference to the accompanying drawings.

[0068] see Figure 5 , which is a schematic diagram of an exhaust gas recirculation fault monitoring device provided in Embodiment 3 of the present application.

[0069] The device is applied to a gas engine with an exhaust gas recirculation system EGR, and the EGR is equipped with a Venturi tube and an EGR valve. The device includes: a differential pressure sensor 501, an ECU (Electronic Control Unit, also known as an electronic control unit) Vehicle electronic control unit) 502 and memory 503;

[0070] The differential pressure sensor 501 is used to obtain the difference between the pressure at the inlet of the Venturi tube and the pressure at the throat of the Venturi tube. ...

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Abstract

The invention provides an exhaust gas reflux fault monitoring method, which is applied to a gas engine with an exhaust gas recirculation system EGR. The EGR is provided with a Venturi tube and an EGRvalve. The exhaust gas reflux fault monitoring method includes the steps that the pressure difference between the pressure at an inlet of the Venturi tube and the pressure at a throat of the Venturi tube; whether the pressure difference between the pressure at the inlet of the Venturi tube and the pressure at the throat of the Venturi tube is less than a preset threshold or not is judged; and if yes, the fact that a reflux fault occurs is judged. According to the exhaust gas reflux fault monitoring method, whether EGR exhaust has a reflux problem or not is judged, and safety of engine operation is ensured. The invention further provides an exhaust gas reflux fault monitoring device.

Description

technical field [0001] The invention relates to the technical field of vehicle control, in particular to a method and device for monitoring an exhaust gas backflow fault. Background technique [0002] When the gas engine is equipped with EGR (Exhaust Gas Recirculation, exhaust gas recirculation system) with Venturi device, the specific structure diagram can be found in figure 1 or Figure 1a As shown, the following figure 1 As an example, part of the high-temperature exhaust gas at the inlet of the volute of the supercharger (not shown in the figure) is discharged, and part of the exhaust gas will be cooled by the cooling device 101 and then enter the mixer through the EGR valve 102 and the Venturi tube 103 104, after the exhaust gas in the mixer 104 is mixed with the air and fuel gas flowing in from the intake pipe, it enters the cylinder 105 for ignition. The gas engine uses EGR to dilute the charge entering the cylinder, reduce the combustion temperature in the cylinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/49F02D41/22
CPCF02D41/22F02M26/49
Inventor 印志强杨新达刘翀解同鹏王文霞武玉臣滑文山刘建
Owner WEICHAI POWER CO LTD