Self-cleaning system for monitoring the opacity of combustion engine exhaust using venturi effect
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United States of America Patent
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Jun 13, 1995
Issued Date -
N/A
app pub date -
Sep 16, 1994
filing date -
Apr 27, 1993
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Abstract
A self-cleaning smoke-monitoring system that is used in measuring opacity of exhaust from an internal combustion engine. The invention includes a pair of air passages that supply a flow of filtered air over the optic elements of the smoke-monitoring system. The flow of particulate-free air is the result of a venturi effect created in the exhaust flow such that ambient air is continuously drawn in through the air ducts.
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