Claims
- 1. An exhaust gas sampling method for analyzing exhaust gas of an automobile, using a flow rate detector mechanism using variable Venturi therein, comprising the following steps:
diluting the exhaust gas from the automobile with fresh air from outside; sampling a portion of the diluted exhaust gas into a sampling bag at a certain ratio; and analyzing the diluted exhaust gas being sampled, wherein a flow rate through said flow rate detector mechanism is changed in a phase of mode for measurement, so that at least a final dew point in the sampling bag approaches a predetermined temperature within a predetermined range of temperature.
- 2. An exhaust gas sampling method as defined in claim 1, wherein the flow rate through said flow rate detector mechanism is changed in the phase of mode for measurement, so that the dew points in the sampling bag are averaged.
- 3. An exhaust gas sampling method as defined in claim 1, wherein the flow rate through said flow rate detector mechanism is changed in the phase of mode for measurement, so that at least the flow rate through said flow rate detector mechanism does not exceed the flow rate of the exhaust gas during the measurement.
- 4. An exhaust gas sampling method as defined in claim 1, wherein the flow rate of the sampling is changed depending upon the change in the flow rate through said flow rate detector mechanism.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-194,149 |
Jul 1998 |
JP |
|
11-023,422 |
Feb 1999 |
JP |
|
Parent Case Info
[0001] This application is a divisional of co-pending application Ser. No. 09/349,926, filed on Jul. 8, 1999, the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. § 120; and this application claims priority of Application No. 10-194149 and 11-023422 filed in Japan on Jul. 9, 1998 and Feb. 1, 1999, respectively under 35 U.S.C. 119.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09349926 |
Jul 1999 |
US |
Child |
09835353 |
Apr 2001 |
US |