Monitoring structure and monitoring method for emission leakage of hydrocarbons of internal combustion engine

Abstract

The invention provides a monitoring structure and a monitoring method for emission leakage of hydrocarbons of an internal combustion engine, which can monitor the emission leakage of the hydrocarbonsof an evaporation system of the internal combustion engine and / or the ventilation system of a crankshaft box of the internal combustion engine. According to the monitoring structure for emission leakage of hydrocarbons of the internal combustion engine, the pollutant gas of the crankshaft box firstly passes by a high pressure flushing pipeline, then flows by a high load pipeline of the evaporationsystem and finally enters an air inlet pipeline in front of a compressor by a Venturi tube. Compared with the prior art, due to the action of the Venturi tube, the faults of the high load desorptionof the evaporation system and the disconnection of the high load pipeline of the ventilation system of the crankshaft box can be monitored simultaneously by newly adding a pressure sensor, the pollutant gas of the crankshaft box will obtain greater degree of vacuum, the change amplitude of the pressure in the pipeline is improved by the Venturi effect, the purpose of covering most diagnostic working conditions by using the pressure sensor of lower sensitivity is realized, the fault recognition is improved, the requirement on the sensitivity of the pressure sensor is reduced, and the productioncost is reduced.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a structure for monitoring the leakage of internal combustion engine hydrocarbon emissions. [0002] The present invention also relates to a method for monitoring hydrocarbon emission leakage of an internal combustion engine evaporation system by using the hydrocarbon emission leakage monitoring structure of the internal combustion engine. [0003] The present invention also relates to a method for monitoring the leakage of hydrocarbon emissions in the crankcase ventilation system of the internal combustion engine by using the hydrocarbon emission leakage monitoring structure of the internal combustion engine. Background technique [0004] The control of hydrocarbon emissions is an important part of the emission control of modern internal combustion engines. For gasoline engines, about 20% of hydrocarbon emissions come from the leakage of the evaporation system, and 25% of hydrocarbon ...

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Problems solved by technology

[0008] As mentioned above, in order to meet the diagnostic requirements of emission regulations to monitor the integrity of the turbocharged engine evaporation system and the crankcase ventilation system at the same time, the existing technical solution needs to add two pressure sensors, and because the pressure in the pipeline in the existing technical solution The pressure difference from the atmospheric pressure is small, and the sensitivity of the pressure sensor is high (usually the sensitivity requirement is less than 3hPa), which greatly limits the diagnostic working conditions

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