Evaporative emission test device and method for automobile parts

Abstract

The invention discloses an evaporative emission test device for automobile parts. The evaporative emission test device comprises a VOC environmental chamber and a hydrogen flame ionization detector, wherein a hydrocarbon sampling port is disposed on the bulkhead of the VOC environmental chamber; a sampling tube of the hydrogen flame ionization detector is inserted into the hydrocarbon sampling port until it extends into the VOC environmental chamber; an electromagnetic check valve is connected to an external exhaust pipe of the VOC environmental chamber; and the VOC sampling port of the VOC environmental chamber is connected to a vacuum bag. A test method for the test device is also provided. While the air impermeability of the VOC environmental chamber of the test device is ensured, it can be also ensured that the inner wall of the test device does not deform or leak due to temperature and pressure changes during a hot dip test and a day and night ventilation emission test. The hydrogen flame ionization detector is provided for the test device in order to test the evaporative emissions in the environmental chamber in real time.

Description

technical field [0001] The invention relates to the technical field of measuring evaporative pollutants of passenger cars, in particular to an evaporative emission test device and a test method for auto parts. Background technique [0002] Evaporative pollutants refer to the sum of hydrocarbons lost from the entire vehicle, in addition to the tailpipe emissions of the vehicle. Vehicle evaporative emission means that after the whole vehicle has gone through the process of filling and discharging oil, pretreatment cycle, butane pretreatment canister, etc., the test vehicle is placed in a closed room, and after heat soaking, day and night ventilation and emission experiments, the diffusion is detected by instruments. The concentration of hydrocarbons in the airtight room is used to calculate the total mass of hydrocarbons emitted by the vehicle through evaporation, expressed in C 1 Equivalent representation. "GB18352.6-2016 Light Vehicle Pollutant Emission Limits and Measurem...

AI Technical Summary

Problems solved by technology

However, during the evaporative emission test of parts, it is necessary to ensure absolute airtightness, and because the temperature needs to be raised during the test process, as the temperature rises, the volume of the airtight chamber will not change after it is airtight, and the corresponding pressure will increase. The inner wall of the airtight chamber is The high-polished stainless steel material cannot withstand high pressure. When the pressure increases, the inner wall will be pressed, causing the inner wall of the airtight chamber to deform, thus affecting the airtightness.

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