Fuel evaporation leakage detection system and method

Abstract

The invention discloses a fuel evaporation leak detection system and method. The system comprises an electronic control unit, an air pump, an oil tank, a carbon pot, a carbon pot electromagnetic valve, and a pressure sensor, wherein the electronic control unit turns off the carbon pot electromagnetic valve when detecting that a motor is at idle speed, acquires a current pressure collected by the pressure sensor and compares the current pressure with a preset calibration value, detects reliability of the air pump if the current pressure is less than the preset calibration value, and collects system pressure when a detection result meets a preset condition, and determines that fuel evaporation and leakage occur when the system pressure is less than a preset reference pressure. Through adoption of the system and method, the fuel pipeline is not vaccumized, so that leakage detection is less difficult; the carbon pot electromagnetic valve is turned off and then whether the electromagnetic valve fails is detected, if there is not fault, whether the air pump has a fault is detected, then, if the air pump has no fault, whether fuel evaporation and leakage occur is determined according to collected system pressure, therefore, a failed part can be positioned accurately, and leakage detection is more accurate.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a fuel evaporation leakage detection system and method. Background technique [0002] Among the whole parts of the car, the fuel system is a very important part. Due to the volatile nature of the gasoline in the fuel tank, the fuel tank is usually full of gasoline vapor at room temperature. In order to control the air pressure in the fuel tank, introduce gasoline vapor into the engine for combustion, and minimize the evaporation of gasoline vapor into the atmosphere when refueling, Onboard Refueling Vapor Recovery (ORVR) is usually used, that is, a carbon canister is installed between the engine and the fuel tank, and activated carbon is installed in the carbon canister. The activated carbon can absorb gasoline vapor, and the fuel tank and the carbon canister are in the same state. , gasoline vapor can enter the carbon tank through the pipeline, and the carbon tank also has ...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a fuel evaporation leakage detection system and method, aiming to solve the technical problems of the prior art in the detection of fuel evaporation leakage, which requires high detection environment and insufficient accuracy

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