Emissions test enclosure with minimized air exchange

Details Emissions test enclosure with minimized air exchange Emissions test enclosure with minimized air exchange

1991-07-15

1992-12-01

Noland, Tom

Measuring and testing

Vehicle chassis

Steering

73 2331, G01M 1500

Patent

active

051671468

ABSTRACT:
A vehicle emissions test shed is able to accommodate internal pressure changes due to temperature changes or other causes during a test cycle, which would otherwise cause a measurement threatening air exchange. The pressure is kept constant, without changing the shed volume and without withdrawing air and fuel vapor from within the shed. Airtight compensation bladders within the shed are inflated or exhausted in response to a sensed incipient pressure drop or rise. The pressure is automatically kept substantially constant, preventing leaks in or out of the shed.

REFERENCES:
patent: 3827675 (1974-08-01), Schuman
patent: 3999425 (1976-12-01), Collin
patent: 4030350 (1977-06-01), Bier
patent: 4174627 (1979-11-01), Swis et al.
patent: 4373377 (1983-02-01), Smith et al.
patent: 4653331 (1987-03-01), Inouye et al.
patent: 4964298 (1990-10-01), Matsushita
patent: 5038617 (1991-08-01), Rollet et al.

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