Method for detecting automobile tail gas based on gas sensor array

A technology of gas sensors and sensor arrays, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as no detection error, no credibility of test results, no multi-gas sensor data fusion processing, etc., to achieve The effect of increasing accuracy and reliability and increasing redundancy

Inactive Publication Date: 2008-11-05
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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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,

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  • Method for detecting automobile tail gas based on gas sensor array
  • Method for detecting automobile tail gas based on gas sensor array
  • Method for detecting automobile tail gas based on gas sensor array

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Embodiment

[0061] Below by embodiment to the present invention application gas sensor array detects CO, NO in automobile exhaust 2 and total hydrocarbon concentration data fusion processing method for further explanation:

[0062] First, select the sensor and connect the detection system: the temperature sensor uses an NTC thermistor; the humidity sensor uses a ceramic humidity sensor; the gas sensor uses a metal oxide gas sensor, and its heating voltage is generally 5V, or provide a suitable heating voltage according to the product description ; The test voltage is generally 5V; the load resistance selection is the best when it is close to the sensor resistance.

[0063] Secondly, the temperature and humidity characteristics calibration and data processing methods of each gas sensor are: based on the typical temperature characteristics of metal oxide gas sensors similar to the temperature characteristics of NTC thermistors, test each gas sensor in clean air or in a certain environment. ...

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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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Application Information

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IPC IPC(8): G01N27/00
Inventor 张正勇梅涛孔德义徐定钧
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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