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Method for computing motor-vehicle exhaust quality by No diluting

A technology for calculating motor vehicles and motor vehicles. It is used in volume measurement, vehicle testing, and measurement of flow/mass flow. It can solve problems such as low accuracy, short service life, and poor repeatability, and improve accuracy and stability. , the effect of simplifying the calculation

Inactive Publication Date: 2007-11-21
ZHEJIANG UNIV MINGQUAN TECH
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AI Technical Summary

Problems solved by technology

Because electrochemical sensors have problems such as poor stability, poor repeatability, short service life, and high cost of replacement, the original measuring devices and measuring methods have large measurement errors, low accuracy, and high cost of use. Poor stability and reliability, unable to accurately reflect the actual pollutant discharge of motor vehicles, etc.
[0008] In addition, due to the presence of O in the air 2 and CO 2 , so use O 2 or CO 2 method to calculate the dilution ratio, except for the need to measure O in the original exhaust and dilution air 2 and CO 2 content, it is also necessary to measure the O in the background air 2 content and CO 2 content, which introduces more error into the dilution ratio calculation

Method used

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  • Method for computing motor-vehicle exhaust quality by No diluting
  • Method for computing motor-vehicle exhaust quality by No diluting
  • Method for computing motor-vehicle exhaust quality by No diluting

Examples

Experimental program
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Embodiment 1

[0063] As shown in Figure 1, the whole system consists of a chassis dynamometer 7 that can simulate acceleration inertia and road running resistance, a special gas analyzer 4, a gas flow analyzer 12, and a bell mouth with a fan 11 connected to the flow analyzer 12 , computer control system 2 and display 1.

[0064] The chassis dynamometer 7 runs on the road with a simulated vehicle load under transient conditions.

[0065] The gas analyzer 4 directly obtains the original tail gas 5 emitted by the motor vehicle 6 through the sampling probe, that is, CO, CO 2 , HC, NOx, O 2 concentration value.

[0066] The flow analyzer 12 measures the flow rate, pressure and temperature of the mixed gas 10 drawn into the flow measuring tube through the fan 11, and the mixed gas 10 is composed of the ambient air 9 and the original tail gas 5 emitted by the motor vehicle. A high-precision infrared sensor is fixed on the flow analyzer 12, and the NO concentration is measured by the infrared se...

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Abstract

A method of using NO dilution ratio to calculate exhaust-gas quality of motor vehicle includes measuring original exhaust-gas of motor vehicle, measuring mixed gas, calculating NO dilution ratio, converting flow rate of diluted exhaust-gas to be flow rate of standard state, calculating flow rate of exhaust-gas from motor vehicle under standard state, calculating exhaust-gas quality of motor vehicle at unit time an calculating total amount of exhaust-gas from motor vehicle.

Description

technical field [0001] The invention relates to a method for detecting and calculating the exhaust gas quality of a motor vehicle, in particular to a method for calculating the exhaust gas quality of a motor vehicle by using the NO dilution ratio. Background technique [0002] The calculation of the dilution ratio is one of the important links in the test system of the simple transient state method of motor vehicles (VMAS). The VMAS test system is a test system used to measure the quality of motor vehicle exhaust emissions. The quality of exhaust emissions is calculated by the concentration of motor vehicle exhaust and the flow rate of motor vehicle exhaust per unit time. It is difficult to directly measure the exhaust flow of motor vehicles. The general method is to use a flow analyzer to measure the flow rate of the mixed gas, and then multiply it by the "dilution ratio" to obtain the actual emission of the motor vehicle. The dilution ratio reflects the degree to which th...

Claims

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Application Information

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IPC IPC(8): G01M17/00G01F1/00G01F15/00
Inventor 项震刘汉民孙继洋杨斌丁宗英
Owner ZHEJIANG UNIV MINGQUAN TECH
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