Avl Test Systems, Inc.

Jonathan D Bushkuhl

Benjamin C Shade

James Patrick Williamson

A system for testing an evaporative emissions (EVAP) canister of a vehicle according to the present disclosure includes an evaporator configured to contain liquid fuel, a fuel vapor supply line configured to deliver a mixture of fuel vapor and carrier gas from the evaporator to the EVAP canister, and a fuel vapor supply valve disposed in the fuel vapor supply line. The test system further includes a gas density meter configured to measure a density of the fuel vapor mixture flowing through the fuel vapor supply line, and a valve control module configured to control a position of the fuel vapor supply valve to adjust a flow of fuel vapor from the evaporator to the EVAP canister based on the fuel vapor mixture density.

System and method for determining a fuel vapor concentration in a canister of a vehicle evaporative emissions system and for evaluating the canister based on the fuel vapor concentration

An example of an emissions test system according to the principles of the present disclosure includes a dilution tunnel and a flow control module. Exhaust gas is mixed with dilution gas in the dilution tunnel. The dilution tunnel is configured to receive dilution gas flowing in an axial direction relative to the dilution tunnel and dilution gas flowing in a radial direction relative to the dilution tunnel. The flow control module is configured to adjust the rate of the dilution gas flow in the radial direction based on at least one of a concentration of pollutant particles in the exhaust gas, a size of pollutant particles in the exhaust gas, a concentration of a gaseous emission in the exhaust gas, a type of fuel combusted by an engine producing the exhaust gas, and a rate of fuel flow to cylinders of the engine.

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Canton, MI, United States of America

Jonathan D Bushkuhl