Complex-environment multiple-working-condition automobile exhaust gas measuring method

Abstract

The invention discloses a complex-environment multiple-working-condition automobile exhaust gas measuring method. The method is characterized by comprising the steps: (1) confirming that an exhaust gas collecting pipe is fixedly connected with an exhaust pipe, an emission measuring instrument and an exhaust gas collecting system and is free of leakage; (2) carrying out real-time determination on exhaust gas emission; arranging monitoring lines so as to monitor the volumetric concentration of pollutants, measuring the pollutant concentration of a certain distance in the axis of a leeward direction of pollutant emission, separately extracting stably-computed data of some fame so as to show spatial exhaust gas phase distribution and flow-field vorticity distribution, and computing the maximum ground concentration and distance of the pollutants; selecting the maximum concentration value and corresponding distance as the maximum ground concentration and distance of the pollutants. The method has the advantages that factors such as vehicle working conditions, wind speed, wind direction, temperature and traffic environment are considered fully; the automobile exhaust gas emission in complex environments and working conditions are simply and accurately measured.

Description

technical field [0001] The invention belongs to the technical field of measurement, and relates to a method for measuring automobile exhaust gas, in particular to a method for measuring automobile exhaust gas under multiple working conditions in complex environments. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles has increased sharply, and the problem of air pollution caused by automobile exhaust has become increasingly serious. Controlling traffic environmental pollution and vehicle emissions has become a top priority. [0003] At present, there are mainly four measurement methods for automobile exhaust emission data used in tests at home and abroad: chassis dynamometer method, tunnel test method, remote sensing test method and vehicle test method. [0004] The chassis dynamometer method is performed under laboratory conditions using a standard test cycle. A test cycle consists of a complete process of stoppin...

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Problems solved by technology

[0008] The invention discloses a method for measuring automobile exhaust under multiple working conditions in a complex environment, in order to solve the problem that the chassis dynamometer method in the prior art cannot reflect the emission conditions on actual roads; the tunnel test method is difficult to further distinguish the emission factors of vehicle models, and the accuracy There is no guarantee; the remote sensing test method is greatly affected by the test location and environment, and the test data is not accurate enough; if the vehicle test method considers vehicle speed, wind speed, wind direction, temperature, traffic environment and other factors, the workload will be heavy and the operation will be complicated. not accurate enough

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