Method and apparatus for measuring evaporative vehicle emissions

Details Method and apparatus for measuring evaporative vehicle emissions Method and apparatus for measuring evaporative vehicle emissions

1993-02-26

1995-02-14

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

73 2331, G01M 1500

Patent

active

053884531

ABSTRACT:
Provided is a method and apparatus for measuring evaporative vehicle emissions. In accordance with the invention, there is provided a leak-tolerant apparatus for use in cooperation with an absolute fluid pressure sensor for measuring evaporative emissions for motor vehicles in accordance with prescribed fluid-temperature profiles. The apparatus includes control means in electrical communication with fluid temperature sensor, a fluid pressure sensor and a volume compensation device for determining the quantity of fluid required to be provided to or evacuated from the volume compensation device in accordance with the ideal gas law. In operation, the control means compares the mass flow, volumetric flow, total mass or total volume with the rate or total change in temperature and pressure and corrects a flow metering device so as to allow more or less fluid into or out of the volume compensation device to achieve the desired test chamber volume compensation.

REFERENCES:
patent: 4964298 (1990-10-01), Matsushita
patent: 5167146 (1992-12-01), Hostetter
patent: 5231873 (1993-08-01), Lindberg

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