Method for detecting automobile tail gas based on gas sensor array

Abstract

The present invention discloses a vehicle end gas detecting method based on a gas sensor array which is provided in a test box that can be changed with temperature and moisture and can be injected or discharged with the gas to be detected. The gas sensor array comprises a CO gas sensor, a NO2 gas sensor, a flammable gas sensor, a temperature sensor and a moisture sensor. The detection method comprises the steps of installing the gas sensor array demarcator and a vehicle end gas detecting system, demarcating the characteristic of gas sensor in clean air, demarcating the sensitivity characteristic of single-component gas by the gas sensor array, demarcating the sensitivity characteristic of total hydrocarbon in vehicle end gas by the gas sensor array, testing the detecting precision of the gas sensor array to the gas mixture, and the detecting and analyzing of the application of gas sensor to the vehicle end gas. The method also comprises a step of data fusion procession. Eight groups of concentration values and average value of eight groups of gas sensor arrays are respectively calculated out. The concentrations of CO, NO2 and total hydrocarbon in the vehicle end gas are respectively obtained.

Description

[0001] Field [0002] The invention relates to the field of automobile exhaust detection, in particular to CO and NO 2 A Gas Sensor Array-Based Method for Automobile Exhaust Gas Detection of Component Concentrations. Background technique [0003] With the sharp increase in the number of cars in our country, car exhaust pollution has become the largest source of air pollution in our country. Moreover, in the state of more and more congested urban traffic, cars will produce more harm to human health when they are idling. Harmful gases such as CO, NO 2 etc., these gases entering the car will seriously affect the health of drivers and passengers. Although there are relevant environmental protection regulations and standards on the emission of vehicle exhaust, the amount of pollutants emitted will vary with the prolongation of the use time of the vehicle and the change of the loading capacity. It is necessary to track and monitor in real time at any time, especially CO and NO in...

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Problems solved by technology

[0007] Through the analysis of these patents, it is found that none of these patents involves how to analyze the mixed gas and how to eliminate the detection error caused by the cross-sensitivity of the sensor to multiple gases or the interference of non-measured gases, because no matter which gas sensor is used to detect The concentration of CO in automobile exhaust has the problem of interference from other components, not to mention that all components are accompanied by each other, and their concentrations are often greater than the concentration of the components to be detected, such as CO; secondly, these patents avoid An important issue is the type and characteristics of the gas sensor used, and the gas sensor is the core of a gas detection device. If this problem is not solved, the test results will not be credible; moreover, these patents all focus on Due to the design of the detection device, it does not involve the fusion processing of multi-gas sensor data

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