Engine with selective venting of unburned mixture from the piston crevice volume

Patent · Tue Mar 04 04:00:00 EST 1980

OSTI ID:5593453

Siewert, R M

The exhaust of unburned hydrocarbons from an internal combustion engine is reduced by selective venting of unburned air-fuel mixture trapped in the piston-cylinder crevice volume in advance of each engine exhaust stroke. Exemplary venting means disclosed include (1) a bypass channel in the cylinder wall which bypasses the piston rings and connects the crevice volume with the engine crankcase in the lower portions of the piston stroke and (2) a cylinder pressure actuated valve controlled bypass passage in the piston which accomplishes a similar function. Location of the bypass channel or passage near to the exhaust valve permits the selective retention of unburned hydrocarbon containing mixture distant from the exhaust valve and thus unlikely to be discharged in the exhaust process. Bypassed mixture is recycled from the crankcase to the inlet manifold with the engine blowby gases for combustion in the cylinders.

• Assignee: General Motors Corp
• Patent Number(s): US 4191150
• OSTI ID: 5593453
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330700 -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
CONTROL
DESIGN
ENGINES
EXHAUST SYSTEMS
HEAT ENGINES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
ORGANIC COMPOUNDS
POLLUTION CONTROL
REMOVAL
SPARK IGNITION ENGINES