Detection method and detection device for conversion ratio of nitrogen oxide detector of diesel vehicle
A technology of nitrogen oxides and detection devices, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of no clear and reliable detection method for conversion rate, no reference for conversion rate detection, cumbersome operation steps, etc., and achieve good traceability High reliability, good on-site operability, and simple detection process
Inactive Publication Date: 2019-01-04
ZHEJIANG MEASUREMENT SCI RES INST
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Problems solved by technology
[0005] At present, when the nitrogen oxide detector for diesel vehicles is measured and calibrated on site, the conversion rate detection cannot refer to the ozone generator method in the type inspection of new vehicles
Because the detection equipment required for this method is complex, poor portability, and cumbersome operation steps, it is not suitable for on-site measurement and calibration of in-use vehicle detection equipment with a large amount and a wide range.
Therefore, there is no clear and reliable detection method for the conversion rate of nitrogen oxide detectors for diesel vehicles at present.
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[0024] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] Diesel vehicle nitrogen oxide detector conversion rate detection device, such as figure 1 As shown, it includes gas source, gas circuit switching module, flow monitoring module, and host computer control software. The gas source consists of 4 bottles of NO standard gas (10-13) with gradient concentration, 4 bottles of NO with gradient concentration 2 Composed of standard gas (14-17) and 1 bottle of high-purity nitrogen (18), of which (19) is a backup gas source. Standard gas and nitrogen are respectively connected to the inlet port of the gas circuit switching module through the pressure reducing valve. The gas circuit switching module includes ten gas circuit switching channels, and controls the on and off of ten two normally closed solenoid valves (20-29) through serial port communication, so as to realize the switchin...
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The invention relates to a detection method and a detection device for conversion ratio of a nitrogen oxide detector of a diesel vehicle. The detection method comprises the following steps: first, introducing NO2 gas of constant concentration into a conversion device; then acquiring an indicating value of concentration of a nitrogen and oxygen channel to calculate the conversion ratio; and correcting the conversion ratio by means of the indicating value of concentration of the nitrogen and oxygen channel by pre-introducing NO gas of constant temperature into an analyzing platform. The detection device comprises a gas source, a gas circuit switching module, a flow monitoring module and upper computer control software. The gas source is connected to the gas inlet end of the gas circuit switching module, the gas outlet end of the gas circuit switching module is connected to the air inlet of the flow monitoring module, and the gas outlet end of the flow monitoring module is connected to the gas inlet end of the nitrogen oxide detector of the diesel vehicle. The detection method and the detection device provided by the invention have good field operability and traceability, so that influence of measuring errors caused by the analyzing platform is solved effectively and the accuracy of a conversion ratio detection result is guaranteed.
Description
technical field [0001] The invention relates to a detection method and a corresponding detection device for detecting the conversion rate of a diesel vehicle nitrogen oxide detector. Background technique [0002] Nitrogen oxides are a mixed pollutant consisting of various compounds such as nitrous oxide (N 2 O), nitric oxide (NO), nitrogen dioxide (NO 2 )Wait. Nitrogen oxides in the air can irritate human lungs, cause acute or chronic respiratory diseases, and are also an important cause of environmental pollution such as photochemical smog and acid rain. Exhaust gas emitted by motor vehicles, especially diesel vehicles, is the main source of nitrogen oxide pollutants. [0003] Diesel vehicle nitrogen oxide detector is a measurement device for measuring the total amount of nitrogen monoxide and nitrogen dioxide in the exhaust pollutants of compression ignition engine vehicles. It is widely used in the annual environmental protection inspection of diesel vehicles in use by...
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IPC IPC(8): G01N33/00
CPCG01N33/007G01N2033/0072
Inventor 邵建文叶振洲赵存彬严瑾
Owner ZHEJIANG MEASUREMENT SCI RES INST
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