Detection device and detection method of sealing performance of automobile fuel evaporation system

A technology of fuel evaporation system and detection method, which is applied in the direction of liquid tightness measurement, charging system, engine components, etc. by using liquid/vacuum degree, which can solve the problems of high overall cost, pollution, air pollution, etc., and achieve tightness detection Accurate results, avoiding the possibility of missed detection, and reducing hardware costs

Inactive Publication Date: 2019-07-23
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional vehicles (meeting the requirements of National V regulations) cannot detect the tightness of the fuel evaporation system, cannot judge whether there is a leak, and cannot prompt for maintenance. Once the fuel evaporation system leaks, it will cause continuous leakage of fuel vapor into the air and not Awareness, resulting in air pollution, serious pollution, and even destruction of the natural environment
[0003] CN105156210A discloses a fuel tank evaporative emission system leak detection device and detection method, which uses a leak detection intelligent module, a leak detection air pump module to cooperate with a carbon tank, a carbon tank desorption solenoid valve (that is, a carbon tank control valve), an engine, an ECU (i.e. electronic control unit), filter, can realize 0.5mm hole leak detection, mainly suitable for PHEV models, but it has the following problems: (1) It cannot be detected when the vehicle is running, and the fuel

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  • Detection device and detection method of sealing performance of automobile fuel evaporation system
  • Detection device and detection method of sealing performance of automobile fuel evaporation system
  • Detection device and detection method of sealing performance of automobile fuel evaporation system

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 , figure 2The detection device for the tightness of the automobile fuel evaporation system shown includes the engine 1, the canister control valve 3, the canister 5, the fuel tank 7, the ash filter 12, the electronic control unit 13, the pressure sensor 8, the canister shut-off valve 10 and the leakage Fault indication module 16, engine water temperature sensor 14 and intake air temperature sensor 15. The engine water temperature sensor 14 and the intake air temperature sensor 15 are installed on the engine 1, one end of the canister control valve 3 is connected to the engine 1 through the control valve outlet pipe 2, and the other end of the canister control valve 3 is connected to the carbon The tank 5 is connected, the carbon tank 5 is connected to the fuel tank 7 through the tank connecting pipe 6, the pressure sensor 8 is installed on ...

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Abstract

The invention discloses a detection device and a detection method of sealing performance of an automobile fuel evaporation system. The detection device comprises an engine, a carbon canister control valve, a carbon canister, a fuel tank, an ash filter, an electronic control unit, an engine water temperature sensor and an intake air temperature sensor, wherein the detection device further comprisesa pressure sensor, a carbon canister stop valve and a leakage fault indication module, the pressure sensor is installed on a connecting pipe of the carbon canister and the fuel tank, the carbon canister stop valve is connected with the carbon canister and the ash filter, and the pressure sensor, the carbon canister stop valve and the leakage fault indication module are electrically connected withthe electronic control unit; and the detection method comprises the following steps: firstly detecting whether the carbon canister stop valve has leakage under the condition that a detection condition is satisfied, then detecting whether the fuel evaporation system has large leakage, and finally detecting whether the fuel evaporation system has small leakage. By adoption of the detection device and the detection method disclosed by the invention, whether the fuel evaporation system has leakage can be detected in time during the operation of the engine so as to better avoid the air pollution caused by fuel vapor leakage.

Description

technical field [0001] The invention belongs to the field of automobile fuel evaporation systems, and in particular relates to a detection device and a detection method for the tightness of the automobile fuel evaporation system. Background technique [0002] With the gradual implementation of the requirements of the National VI regulations for automobiles, in order to make the automobile better emission reduction and environmental protection, the regulations require that the tightness of the fuel evaporation system must be tested and whether there is leakage (that is, whether there is a 1mm hole leakage), if there is leakage, then It needs to be prompted (leakage fault) for maintenance to avoid leakage of fuel vapor into the air and pollute the atmosphere. However, traditional vehicles (meeting the requirements of National V regulations) cannot detect the tightness of the fuel evaporation system, cannot judge whether there is a leak, and cannot prompt for maintenance. Once ...

Claims

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Application Information

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IPC IPC(8): G01M3/26G01M3/28F02M25/08
CPCF02M25/08F02M25/0836G01M3/26G01M3/28
Inventor 胡俊张金泰刘斌李芮祝俊高杰
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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