Engine with selective venting of unburned mixture from the pisto

Details Engine with selective venting of unburned mixture from the pisto Engine with selective venting of unburned mixture from the pisto

1978-03-20

1980-03-04

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 75C, 123193C, 123193CP, F02M 2506

Patent

active

041911504

ABSTRACT:
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.

REFERENCES:
patent: 3583375 (1971-06-01), Pischinger
patent: 3667443 (1972-06-01), Currie et al.
patent: 3703164 (1972-11-01), Weaving
patent: 3905344 (1975-09-01), Villella
patent: 3982514 (1976-09-01), Turns et al.

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