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Detection method and detection system for upstream pressure of Venturi tube

A venturi tube and detection method technology, applied in the direction of charging system, fuel injection control, exhaust gas recirculation, etc., can solve the problems of no longer updating, affecting the use of EGR, etc., to improve accuracy, ensure effectiveness and accuracy Effect

Active Publication Date: 2019-07-26
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing method, after the diagnosis result is judged, if the engine is out of the static speed condition, the diagnosis result will no longer be updated, which will affect the use of EGR in the entire driving cycle.

Method used

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  • Detection method and detection system for upstream pressure of Venturi tube
  • Detection method and detection system for upstream pressure of Venturi tube
  • Detection method and detection system for upstream pressure of Venturi tube

Examples

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Embodiment 1

[0032] Embodiment 1 of the present application provides a method for detecting upstream pressure of a Venturi tube, which is applied to an exhaust gas recirculation system (hereinafter referred to as EGR) equipped with a Venturi tube, and will be described in detail below with reference to the accompanying drawings.

[0033] see figure 2 , which is a flowchart of a method for detecting upstream pressure of a Venturi tube provided in Embodiment 1 of the present application.

[0034] The method described in the embodiment of the present application includes the following steps:

[0035] S201: When the engine is in a stable working condition and the EGR valve is closed, obtain the upstream pressure of the Venturi tube and the pressure after the throttle valve, and obtain the pressure difference between them.

[0036] When the EGR valve is closed, there is no exhaust gas flow in the Venturi tube, and the Venturi tube is directly connected to the intake pipe of the engine. When t...

Embodiment 2

[0051] Based on the method for detecting the pressure upstream of the Venturi tube provided in the above embodiments, Embodiment 2 of the present application also provides a system for detecting the pressure upstream of the Venturi tube, which will be described in detail below with reference to the accompanying drawings.

[0052] see image 3 , which is a schematic diagram of a pressure detection system upstream of the Venturi tube provided in Embodiment 2 of the present application.

[0053] The system described in the embodiment of the present application includes: a first pressure sensor 301a, a second pressure sensor 301b, and a vehicle-mounted electronic control unit ECU302. The "first" and "second" are just for convenience of description, and do not constitute a limitation on the two pressure sensors.

[0054] The vehicle-mounted electronic control unit ECU302 is used to control the first pressure sensor 301a to detect the upstream pressure of the Venturi tube and contr...

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Abstract

The invention provides a detection method for an upstream pressure of a Venturi tube. The method comprises the following steps: acquiring the upstream pressure of the Venturi tube and a pressure behind a throttle valve and acquiring a pressure difference value of the upstream pressure of the Venturi tube and the pressure behind the throttle valve when an engine is in a stable working condition andan EGR valve is closed; and when the pressure difference value is smaller than a current judgment threshold value, determining that the detection result of the upstream pressure of the Venturi tube is reliable. According to the detection method provided by the invention, the engine is not required to be in an idle state, the upstream pressure of the Venturi tube is also detected in a process thatthe engine operates, and the effectiveness and the accuracy of the detection result are guaranteed, so that the control accuracy of the EGR is further improved. The invention also provides a detection system for the upstream pressure of the Venturi tube.

Description

technical field [0001] The present application relates to the technical field of vehicle control, in particular to a method and system for detecting upstream pressure of a Venturi tube. Background technique [0002] When the gas engine is equipped with EGR (Exhaust Gas Recirculation, exhaust gas recirculation system) with Venturi tube, the specific structure can be found in figure 1 and figure 2 As shown, the following figure 1 As an example, part of the high-temperature exhaust gas discharged from the cylinder 105 will be cooled by the cooling device 101, then pass through the EGR valve 102, the Venturi tube 103, and enter the mixer 104. In the mixer 104, the exhaust gas is mixed with the air and gas flowing into the intake pipe After the gas, it enters the cylinder 105 to ignite. The gas engine uses EGR to dilute the charge entering the cylinder, reduce the combustion temperature in the cylinder of the gas engine, and reduce the heat load. [0003] The pressure sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02M26/45
CPCF02D41/222F02D2200/101F02M26/45
Inventor 王龙王文霞赵淞于洪峰徐永新
Owner WEICHAI POWER CO LTD
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