Internal-combustion engines – Multiple cylinder
Patent
1990-06-08
1991-02-12
Okonsky, David A.
Internal-combustion engines
Multiple cylinder
123568, F02M 3510
Patent
active
049915479
ABSTRACT:
An intake port pressure control system comprises an intake passage leading to a cylinder in an engine, and a check valve in the intake passage to allow fluid flow toward the cylinder and obstruct fluid back-flow in the reverse direction. A bypass port is located on the intake passage so that the bypass port communicates with a trapped volume defined by the portion of the intake passage between the check valve and intake valve. The intake port pressure control system further comprises a control valve having an outlet passage, a secondary passage, and an actuator enabling communication between the outlet passage and secondary passage. The actuator further enables active adjustment of the flow area of the flowpath between the secondary passage and outlet passage throughout a range of engine operating conditions. The outlet passage is connected to the bypass port, and the secondary passage is connected to a secondary air source. The control valve enables a controlled air flow therein between the secondary air source and the trapped volume when the intake valve is closed.
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Davis Richard S.
MacFarlane Glen R.
Wu Ko-Jen
Belcher Gordon F.
General Motors Corporation
Okonsky David A.
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