JP2002188981A - Measuring method in exhaust gas test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep uniformity of data in a stabilized portion based on sample data or the like, corresponding to each component concentration in exhaust gas. SOLUTION: When the data in the stable portion b are acquired from the sample data 10 of the each component concentration in the exhaust gas obtained in an exhaust gas test, and/or a device data such as an engine speed and boost pressure, and when a value thereof is calculated based on the data in the stable portion b, a stable allowance width W in each sample and/or each device, measuring times t1, t2, t3, t4,..., tj,..., tm, tn,... therein, and total measuring time T from the start of measurement upto the measurement completion are preliminarily set before the exhaust gas test, and computing of each standard deviation is carried out within the measuring time T while obtaining all the time moving averages in the measuring times t1, t2, t3, t4,..., tj,..., tm, tn,... from the start of the measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a measuring method in an exhaust gas test.

[0002]

2. Description of the Related Art To automate an exhaust gas test of an automobile,
It is necessary to collect and process data according to each regulation test as well as to automatically operate the regulation mode. New Vehicle Review Standards (Traffic Safety and Nuisance
Research Institute's Automotive Type Approval Tes
t Standards: TRIAS, Japan) includes the concentration of each component in exhaust gas, engine speed, Boos
It is specified to measure t pressure.

For example, when the concentration value indicated by the gas analyzer is recorded by a pen recorder connected to the gas analyzer in an idle state, the concentration value becomes stable with the passage of time.
For example, as shown in FIG. 2, the density curve (sample data) 5 on the recording paper 4 shows a stable state as indicated by a symbol a. However, conventionally, an operator visually observes the recording paper 4 of the pen recorder. Then, it is determined whether or not a stable portion a without any fluctuation is generated in the density curve 5, and if it is determined that the stable portion a is generated, the operator operates a trigger for starting the measurement using the remote controller. In addition, the operator operates a trigger for stopping the measurement using the remote controller, and the average value of the density during this time (for example, for 4 seconds) is used as the density value.

[0004]

However, since the stable part a is visually determined by the operator, that is, the measurement start and measurement stop must be determined by the operator himself, the operator may be unstable. The judgment of the stable part a without the difference is different, the uniformity of the stable part a cannot be maintained,
They were not always perfect in terms of certainty or reliability.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and has as its object to achieve uniformity of data of a stable portion from sample data corresponding to the concentration of each component in exhaust gas. It is to provide a measurement method in a test.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for obtaining a stable portion from sample data of each component concentration in exhaust gas obtained in an exhaust gas test and / or device data such as engine rotation and Boost pressure. In measuring these values based on the data of this stable portion, the allowable tolerance width and the measurement time for each sample and / or device, and the total measurement time from the start of measurement to the end of The standard deviation is set in advance before the test, and the standard deviation is calculated within the total measurement time while constantly taking a moving average during the measurement time from the start of measurement.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of sample data 10 of the concentration of a target component in exhaust gas discharged in an idling state of an automobile. Hereinafter, the procedure for obtaining the density value will be described with reference to FIG.

In this embodiment, an idle test is started.
Before the start of idle measurement, the idle
Taking the total idle measurement time T until the measurement end time B
If you set it to 1 minute,
Total idle measurement to measure all sample data
Idle measurement time t within time T₁, T_Two, T_Three,
t _Four, ..., t_j, ..., t_m, T_n, ... for example 4 seconds
Set it. Furthermore, the stability tolerance width W according to the sample is also expected.
To be set. In this embodiment, the idle test
The experiment start time is defined as idle measurement start time A.

(1) First, idle measurement times t ₁ , t ₂ , t ₃ , t ₄ ,.
A moving average of t _j ,..., t _m , t _n ,. Then, based on these moving averages, each standard deviation (Standard D
eviation: S. D) is calculated.

In this case, each average value, their S.D. The calculated D value can always be displayed on a computer screen in real time.

(2) Then, of the calculated values, when the time T _{1 has} elapsed from the idle measurement start time A, T.P. If the calculated value D is within the stability allowable width W set before the start of the idle test, the average value at that time is used as the concentration value of the target component. That is, when the idle measurement time is t _n , that is, T ₁ obtained from the sample data 10
Through T ₂ hours (4 seconds) wander without stable partial average value the density value of data b in the (determined value).

Also in this case, the S.P. It is possible to display in real time whether or not the calculated D value is within the stability allowable width W. Further, the determined value can be displayed on a computer screen.

As described above, since the real-time sample data 10 is always measured in 4-second intervals from the idle measurement start time A, the data of the stable portion b in which the fluctuation-free state is maintained is obtained from the sample data 10. Can be easily obtained between the start time A of the idle measurement and the end time B of the idle measurement, and conventionally, the inconvenience caused by the operator himself / herself determining the start and stop of the measurement to obtain the data of the stable portion a is solved. Thus, the uniformity of the data of the stable portion b can be maintained.

The stable portion b is not between the idle measurement start time A and the idle measurement end time B. If the calculated D value does not fall within the stability allowable width W, logging (LOGI) during the total idle measurement time T
NG), surveyed from the concentration data (data logger),
Concentration data can be created.

In the above embodiment, the procedure for obtaining the concentration value in the idle state has been described. However, the same processing as described above is performed for each device data such as the engine rotation in the idle state and the Boost pressure in the idle state. This makes it easy to obtain stable data from device data such as engine speed and Boost pressure. In these cases,
Each average value, their S.D. The calculated value is always displayed in real time. It is possible to display in real time whether or not the calculated D value is within the stability allowance set according to the device, and further to display the determined value.

In the above embodiment, the total eye
Measurement time T and idle measurement time t ₁, T_Two, T_Three, T
_Four, ..., t_j, ..., t_m, T_n, ... time setting T> t₁, T_Two, T_Three, T_Four, ..., t_j, ..., t_m, T
_n, ..., but the stability allowable width W is set as large as possible to obtain T = t.₁, T_Two, T_Three, T_Four, ..., t_j, ..., t_m, T
_n, ... The time can also be set. In this case, decided
Find the average value of time T and its standard deviation value in one operation
be able to.

[0017]

According to the present invention, before the sample data of each component concentration in the exhaust gas and / or the exhaust gas test such as the engine rotation and the Boost pressure, etc., the permissible stability range, the measurement time and the measurement time for each sample and / or device are measured. Since the total measurement time from the start to the end of the measurement is set in advance before the exhaust gas test, and the moving average and the standard deviation during the measurement time are determined within the total measurement time, the sample data within the total measurement time and While all the device data is measured in real time, stable portion data can be easily obtained from the sample data and / or device data, and their values can be measured based on the stable portion data.

That is, there is no individual difference between the operators in the determination of the stable portion data without fluctuation, and the uniformity of the stable portion data obtained from the sample data and / or device data can be maintained. A reliable or reliable measured value can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is a diagram for explaining a measurement method in a conventional exhaust gas test.

[Explanation of symbols]

10 ... sample data, b ... stable moiety, T ... total idle measuring _{time, t 1, t 2, t} 3, t 4, ..., t
_j ,..., t _m , t _n ,... idle measurement time, W.

Claims (1)

[Claims] 1. Stable data is obtained from sample data of each component concentration in exhaust gas obtained in an exhaust gas test and / or device data such as engine rotation and Boost pressure, and the data is obtained based on the data of the stable portion. In measuring the value of, the allowable tolerance width and the measurement time for each sample and / or device and the total measurement time from the start of measurement to the end of measurement are set in advance before the exhaust gas test, and the measurement time A method for calculating a standard deviation while constantly taking a moving average in a total measurement time.