Apparatus and method for non-intrusive testing of motor vehicle

Details Apparatus and method for non-intrusive testing of motor vehicle Apparatus and method for non-intrusive testing of motor vehicle

1994-01-25

1995-06-20

Raevis, Robert

Measuring and testing

With fluid pressure

Motor part or auxiliary

G01M 326

Patent

active

054252660

ABSTRACT:
An apparatus and method for the non-intrusive testing of evaporative fuel vapor systems of motor vehicles. A portable pressure control and monitoring unit is inserted into the fuel filler neck of a vehicle. The vapor vent line, leading from the fuel tank to the charcoal canister of the evaporative system, is temporarily clamped off. Pressurized gas is introduced into the unit from an operator's console, expanding a ring bladder and sealing an annular volume between the unit and the filler neck. Gas is then passed through the unit into the contained volume of the evaporative system. After the neck cap is replaced, an automatic timer deflates the ring bladder, charging the remaining volume of the evaporative system. Pressure decay data is collected and stored in the unit's digital storage device. Initially, this data is used in a pass/fail determination made by a microprocessor in the unit. Later, the data is downloaded into a separate computer for archival purposes.

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patent: 5267470 (1993-12-01), Cook
patent: 5327776 (1994-07-01), Yasui et al.

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