Method for detecting cleanliness of national sixth carbon canister of automobile

Abstract

The invention discloses a method for detecting the cleanliness of a national sixth carbon canister of an automobile. The method comprises the steps of installing a detection device, cleaning and installing a to-be-detected carbon canister, simulating the working environment of the whole automobile, setting test parameters, testing and detecting, checking a detection result, finishing detection, and closing a vibration table and a negative pressure generator. The detection device comprises a vibration table, and a particulate matter measuring device, a negative pressure generator, a flow regulating valve and a flow meter which are connected in sequence. The invention provides an effective detection method for detecting the cleanliness of the carbon tank, the method simulates the actual operation condition of the carbon tank on the whole vehicle to the greatest extent, the size of the activated carbon particles in the airflow conveying pipeline is measured through the particle measuring device, and the detection efficiency and precision are high; whether the size of the activated carbon particles meets the requirements of upstream and downstream parts (electromagnetic valves and electrical modules) or not can be checked conveniently, and effective guidance and scientific basis can be provided for material selection of liners (non-woven fabrics, sponges and the like) used by the carbon canister, the fixing mode of the liners, the size design of the liners and the like.

Description

technical field [0001] The invention specifically relates to a method for detecting automobile parts, in particular to a method for detecting the cleanliness of an automobile's National VI carbon tank. Background technique [0002] At present, the National Sixth Standard has added the requirements for the on-line detection (OBD) of fuel system air tightness. The main detection process includes: (1) ECU issues an instruction to close the canister shut-off valve at the atmospheric port of the canister; (2) intake manifold Draw a negative pressure to the fuel system, and then the ECU sends a command to close the canister desorption solenoid valve, and the fuel system is a closed whole at this time; (3) After completing the above two steps, the ECU monitors the fuel system through the pressure sensor in the fuel system The actual pressure monitors the decay rate of the negative pressure generated in step (2). If the decay rate exceeds a certain limit, it is determined to be a sy...

AI Technical Summary

Problems solved by technology

[0007] At present, there is neither a special device nor an effective detection method for the cleanliness of the carbon canister. The filter cloth is connected in series in the pipeline for particle collection. After a period of time, the particles are collected and placed under a microscope to measure the size. The traditional detection method has two disadvantages:

[0008] One is that vibration is not introduced to simulate the operation of the real vehicle, and vibration has a strong role in promoting the migration of fine particles;

[0009] Second, because the filter cloth itself is also a porous medium for ventilation, some particles may directly pass through or be embedded in the medium, and the probability of loss of escaped particles is also high, making the test results unreal

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