A method for measuring vocs emission factor of motor vehicle evaporative emission operation loss

Abstract

The invention discloses a vehicle evaporative emission operation loss VOCs emission factor measurement method. Based on serial applications of multiple modes, the operation loss emission can be indirectly and quantitatively judged. The method comprises steps of light-duty gasoline vehicle and heavy-duty diesel vehicle exhaust emission laboratory measurement, light-duty gasoline vehicle hot dipping emission VOCs emission factor laboratory measurement, actual road vehicle VOCs comprehensive emission factor tunnel measurement, VOCs species chemical composition analysis and model analysis. Based on the light-duty gasoline vehicle exhaust emission and hot dipping emission in a laboratory airtight cabin or a drum, a single process characteristic source spectrum is built. The model analysis comprises chemical mass balance model analysis and comprehensive emission factor deduction. Operation loss emission factors of a vehicle group in an actual road condition are finally built. The technology makes up for the existing lacked vehicle VOCs operation loss emission testing condition, emission errors caused by inconsistency between the experimental condition and the actual condition when the vehicle VOCs operation loss is tested in the laboratory in the past can be solved, and the vehicle VOCs operation loss emission factors can be accurately acquired.

Description

technical field [0001] The invention belongs to the technical field of VOCs evaporative emissions of motor vehicles, in particular to a method for measuring VOCs emission factors of motor vehicle evaporative emissions operation losses. Background technique [0002] Motor vehicle VOCs emission is the main source of VOCs in the urban atmosphere, and its emission process mainly includes tail gas emission and evaporative emission. With the advancement of exhaust emission control technology, the contribution of evaporative emissions to the total emissions of VOCs from motor vehicles has become increasingly significant. Evaporative emissions mainly include diurnal emissions, heat soak emissions, refueling emissions, seepage emissions, and operating losses. The discharge mechanism mainly includes: 1. Due to the increase in temperature, the oil and gas generated in the fuel tank expands and is discharged into the atmosphere through the exhaust port; 2. The oil component molecules a...

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Problems solved by technology

[0003] At present, it is difficult to implement the VOCs emission test of motor vehicle operation loss in China. The specific reason is that the completion of the test requires equipment such as a variable temperature airtight cabin with a drum, and there is currently no laboratory in China that can meet the test conditions. Therefore, the current national In the Sixth Draft, only the indirect treatment of VOCs evaporative emission operating losses of vehicles can be carried out based on experience, and there is no test standard for regulated vehicle VOCs evaporative emission operating losses; in addition, the VOCs operating loss emissions of motor vehicles need to be measured based on actual road conditions. The research shows that the current experimental conditions cannot reflect the active state of the vehicle under the actual road conditions

To sum up, the measurement of running loss requires an airtight cabin with a drum, laboratory construction, existing laboratory renovation and operation and maintenance costs are extremely high, and the state of the vehicle under the test condition may not match the actual road condition , making it difficult to obtain the emission factor of VOCs evaporative emission operation loss of domestic motor vehicles

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