초록 ▼

A vehicle emission analysis interface system for supplying a sample of a test vehicle's exhaust gases to the inlet of an analyzer for providing a quantitative measurement of selected pollutants includes an exhaust sample inlet port for receiving a sample of the exhaust gases. A high pressure inlet p

A vehicle emission analysis interface system for supplying a sample of a test vehicle's exhaust gases to the inlet of an analyzer for providing a quantitative measurement of selected pollutants includes an exhaust sample inlet port for receiving a sample of the exhaust gases. A high pressure inlet port is adapted to be connected to a high pressure source at the test facility. A chiller for lowering the temperature of incoming gas sample stream has an inlet connected to the sample inlet port and an outlet. The system further includes a zero air generator having an inlet and an outlet for supplying purified air for analyzer calibration purposes. A reverse purge valve is arranged to selectively connect the high pressure inlet port to the zero air generator inlet and the chiller outlet in series with the analyzer inlet or to connect the high pressure inlet port to the chiller outlet to purge the chiller and components which feed the exhaust gas sample to the chiller of pollutants in the gas sample of the last vehicle tested. Valving is also provided to direct air from the zero air generator to a fuel cap adaptor with the flow rate being measured to check the integrity of the fuel cap with respect to the leakage of pollutant fumes.

대표청구항 ▼

[ What is claimed is:] [1.] In a vehicle emission analysis interface system for supplying a sample of a test vehicle's engine exhaust gases to an inlet of an analyzer for providing a quantitative measurement of selected pollutants, the combination comprising:an exhaust gas sample inlet port adapted

[ What is claimed is:] [1.] In a vehicle emission analysis interface system for supplying a sample of a test vehicle's engine exhaust gases to an inlet of an analyzer for providing a quantitative measurement of selected pollutants, the combination comprising:an exhaust gas sample inlet port adapted to be connected to an exhaust gas probe through a hose for receiving a sample of the vehicle's exhaust gases;a high pressure air inlet port adapted to be connected to a high pressure air source;a chiller having an inlet and an outlet for lowering the temperature of the exhaust gases passing therethrough, the chiller inlet being connected to the exhaust gas sample inlet port;a zero air generator having an inlet and an outlet for providing substantially purified air under a predetermined pressure in the outlet thereof; anda reverse purge valve connected in series relationship with the high pressure inlet port, the zero air generator inlet, the chiller outlet and the analyzer inlet, the purge valve being arranged to selectively connect the high pressure inlet port to the zero air generator inlet and the chiller outlet in series with the analyzer inlet or to connect the high pressure inlet port to the chiller outlet.