Crankcase ventilation system with constant restriction in the flow direction and free flow in an opposite direction
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United States of America Patent
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Nov 8, 2022
Grant Date -
Jul 16, 2020
app pub date -
Jan 10, 2020
filing date -
Jan 11, 2019
priority date (Note) -
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Abstract
A breach detection system for an internal combustion engine having a crankcase, an intake manifold, a positive crankcase ventilation valve, a crankcase ventilation tube with a flow control system therein, and a pressure sensor between the flow control system and the crankcase. The flow control system subdivides the crankcase ventilation tube into a plurality of parallel conduits—a first conduit having a normally closed check valve that opens under a first preselected pressure drop in a first direction from the air intake to the crankcase, and a second conduit having either a second check valve that opens under a second preselected pressure drop in a second direction opposite the first direction or a restriction profile having a third preselected pressure drop that is the same in both the first and second direction. When the pressure sensor detects no pressure drop there is a breach in the system.
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