Method for computing motor vehicle exhaust quality utilizing HC dilution ratio

Abstract

The invention relates to a vehicle exhaust quality examination computational method, especially relates to a computation vehicle exhaust quality method of using HC dilution ratio, which including the following steps, (1) vehicle discharges the primitive exhaust survey; (2) gaseous mixture survey; (3) HC dilution ratio K computation; (4) dilution exhaust current capacity transforms into the standard condition current capacity; (5) under the standard condition calculate vehicle exhaust current capacity VSE; (6) computation the discharges quality vehicle exhaust in the unit time; (7) computation vehicle gas exhaust total quantity. The invention provides a computation vehicle exhaust quality method of using HC dilution ratio, obtains the HC dilution ratio in the vehicle exhaust using the surveying computation and then calculates the lumpy mass of the vehicle discharge pollutant, which merit is that the measuring accuracy is high, the stable is good, and may effectively reduce the survey cost.

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 adopting the HC dilution ratio. Background technique [0002] The calculation of dilution ratio is one of the important links of the vehicle simple transient condition method (VMAS) test system. The VMAS test system is a test system used to measure the exhaust emission quality of motor vehicles. The exhaust emission quality is calculated by the concentration of motor vehicle exhaust gas and the flow rate of motor vehicle exhaust per unit time. It is difficult to directly measure the flow rate of motor vehicle exhaust gas. The general method uses 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 volume of the motor vehicle. The dilution ratio reflects the degree to which the or...

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

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