Heavy-duty vehicle PM fast handheld detection device and detection method

Abstract

The invention discloses a heavy-duty vehicle PM fast handheld detection device and a detection method. The heavy-duty vehicle PM fast handheld detection device comprises the main constituent parts ofa gas collection module, an analysis module, a signal processing module, a storage module, a man-machine interaction module and a power supply module, the analysis module serving as the core part hasthe function of real-time continuous monitoring and has high sensitivity to particles and ultrafine particles, particle sample collection and dilution are not needed, the working temperature range iswide, response is fast, and a measurement value is not affected by the flow, pressure and temperature changes. Compared with a current testing instrument conducting a bench test or on-board testing, the heavy-duty vehicle PM fast handheld detection device can be designed to be a device which is more elaborate, more portable and convenient to use; and the heavy-duty vehicle PM fast handheld detection device is high in response speed and can adapt to the testing environment with large heavy-duty vehicle displacement and the high concentration.

Description

Technical field [0001] The present invention relates to the technical field of vehicle PM detection, and more specifically to a heavy-duty vehicle PM rapid handheld detection device and a detection method thereof. Background technique [0002] With the rapid increase in the number of motor vehicles, motor vehicle pollution has become an important source of air pollution in my country. Some cities are characterized by motor vehicle exhaust pollution, which directly affects human health. The results of atmospheric PM2.5 source analysis in 15 cities including Beijing, Tianjin and Shanghai showed that the contribution of mobile sources to PM2.5 concentration in local emission sources ranged from 13.5% to 52.1%; the analysis of PM2.5 sources released by Beijing showed that, Local emissions accounted for two-thirds of the main sources of PM2.5 in Beijing throughout the year, and mobile sources accounted for 45%. Diesel vehicles driving in Beijing contributed the most. Classified by ve...

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Problems solved by technology

[0003] At present, there is no mature PM mass concentration sensor that can be used for real vehicle testing, so PM sensors cannot be applied to PM detectors. In order to detect the mass concentration of particulate matter, three methods can be used: charge method, oscillating balance, and laser scattering

The oscillating balance method is costly and is susceptible to external interference during use, and the core components of the oscillating balance need to be cleaned frequently to ensure the detection accuracy, and cannot achieve rapid detection; the diameter of the main particles that can be measured by the laser scattering method is >70nm, while the heavy-duty The particle size detection range required by the new diesel vehicle emission regulations is >23nm, and the National V and National VI diesel vehicles mainly emit small particle size particles, so their use conditions are limited and cannot meet the larger range, while its detection stability Poor, can not meet the small measurement error

[0004] The charge method to measure PM mass concentration is the recommended method for on-board emissions of heavy-duty vehicles. There are already mature charge method sensors for selection, but at present, some devices or equipment for measuring PM mass concentration by charge method still have high cost, large energy consumption and large volume , is not conducive to the realization of lightweight, handheld requirements

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