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Fault detection method and system for desorption control valve of fuel evaporation and emission system

A technology of evaporative emission and desorption control, applied in engine control, fuel injection control, electrical control, etc., can solve the problems of low detection frequency and accuracy, oscillation of fuel tank pressure signal, difficulty in meeting detection frequency, etc., to improve accuracy , the effect of increasing the amount of change

Inactive Publication Date: 2020-02-21
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the engine air-fuel ratio signal and the intake air signal are usually relatively stable under idling conditions, which are suitable for detecting the normally open fault of the desorption control valve. Therefore, the fault detection frequency of the above two detection methods is low, and it is difficult to meet the detection frequency. Due to the pressure dynamic characteristics of the entire evaporative emission system, when the desorption control valve is opened, the tank pressure signal will oscillate periodically
The oscillation characteristic of the fuel tank pressure is determined by the design parameters of the fuel evaporation system, which will affect the accuracy of judging the normally open fault of the desorption control valve based on the change of the fuel tank pressure signal
Therefore, the detection frequency and accuracy of the current fuel evaporative emission control system desorption control valve normally open fault detection method are low

Method used

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  • Fault detection method and system for desorption control valve of fuel evaporation and emission system
  • Fault detection method and system for desorption control valve of fuel evaporation and emission system
  • Fault detection method and system for desorption control valve of fuel evaporation and emission system

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Embodiment 1

[0058] This embodiment provides a fault detection method for the desorption control valve of the evaporative emission system, which is used for detecting the normally open fault of the desorption control valve of the fuel evaporative emission system of the vehicle, wherein the fuel evaporative emission system of the vehicle can also be called the vehicle's Fuel evaporative emission control system. First, in order to facilitate the understanding of the fault detection method for the desorption control valve of the evaporative emission system provided in this embodiment, the fuel evaporative emission control system and the engine air intake system of the vehicle are firstly described in this embodiment.

[0059] For example, as figure 1 As shown, the vehicle includes an evaporative emissions system 100 and an engine intake system 200 .

[0060] Among them, the evaporative emission system includes a fuel tank 1, a fourth vacuum pipeline 2, an activated carbon tank 4, a detection...

Embodiment 2

[0068] This embodiment can be implemented by the fuel evaporative emission system desorption control valve fault detection system, the fuel evaporative emission system desorption control valve fault detection system can be implemented by software and / or hardware, the fuel evaporative emission system desorption control valve The valve fault detection system can be integrated in the vehicle's ECU. The method provided in this embodiment can be applied to the embodiment and various optional implementations of the fault detection system for the desorption control valve of the fuel evaporative emission system. Such as image 3 As shown, the fault detection method for the desorption control valve of the fuel evaporative emission system includes the following steps:

[0069] S1. Obtain the characteristic data of the vehicle, which includes engine speed, vehicle speed, intake pressure, ambient pressure, ambient temperature and detection results of the desorption flow rate of the fuel ...

Embodiment 3

[0094] This embodiment provides a fault detection system for the desorption control valve of the fuel evaporative emission system, which can implement the above-mentioned fault detection method for the desorption control valve of the fuel evaporative emission system. Specifically, such as Figure 5 As shown, the fuel evaporative emission system desorption control valve fault detection system includes:

[0095] The first obtaining device 501 is used to obtain characteristic data of the vehicle, the characteristic data includes engine speed, vehicle speed, intake pressure, ambient pressure, ambient temperature and detection results of desorption flow rate of the fuel evaporative emission system;

[0096] The first judging means 502 is used to judge whether the feature data satisfies the enabling condition of fault detection;

[0097] The first sending device 503 is used to send an opening instruction to the desorption control valve of the vehicle when the characteristic data me...

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Abstract

The invention discloses a fault detection method and system for a desorption control valve of a fuel evaporation and emission system and belongs to the technical field of vehicle emission. The methodincludes the steps that S1, feature data of a vehicle are obtained; S2, whether the feature data meet a fault detection enabling condition or not is judged; S3, an opening instruction is sent to the desorption control valve of the vehicle so that the desorption control valve can be instructed to be opened; S4, the pressure value in the fuel evaporation and emission system of the vehicle is obtained; S5, whether the pressure in the fuel evaporation and emission system of the vehicle is stable or not is judged; S6, the pressure value in the fuel evaporation and emission system of the vehicle isdetermined to be the first pressure value; S7, a closing instruction instructing the desorption control valve to be closed is sent to the desorption control valve; S8, the second pressure value in thefuel evaporation and emission system of the vehicle is obtained; and S9, when the difference value of the first pressure value and the second pressure value is larger than the preset pressure difference threshold, it is ensured that a normally-opening fault happens to the desorption control valve. By means of the method, the fault detection accuracy of the desorption control valve of the fuel evaporation and emission system is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle emissions, in particular to a method and system for detecting a fault in a desorption control valve of a fuel evaporative emission system. Background technique [0002] The desorption control valve is located between the vehicle's activated carbon tank and the intake pipe, and is used to control the desorption process of the fuel vapor adsorbed in the activated carbon tank. And the desorption control valve is an important actuator to control the desorption process of fuel vapor. If the desorption control valve fails to open normally, the engine control system cannot effectively control the desorption process; and when the engine is shut down for a long time, there will be fuel vapor Risk of environmental pollution from emissions into the atmosphere. [0003] In the prior art, the normally open fault detection method of the desorption control valve is usually to compare the change of the engine ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02M25/08
CPCF02M25/0809F02D41/004F02M25/089F02M25/0836Y02T10/40
Inventor 刘廷伟宋同好孙鹏远邹铁欣白宇刘笑飞苍贺成
Owner CHINA FIRST AUTOMOBILE
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