Internal combustion engine with sustained power stroke

Details Internal combustion engine with sustained power stroke Internal combustion engine with sustained power stroke

1978-10-05

1980-09-09

Lazarus, Ronald H.

Internal-combustion engines

Precombustion and main combustion chambers in series

Precombustion chamber having a specific shape

123286, 123572, F02B 1916

Patent

active

042211980

ABSTRACT:
A four stroke cycle internal combustion engine is presented having a sustained power stroke which results from a delayed mixing of a stratified charge. Use of delayed mixing of an overall stoichiometric air-fuel mixture results in formation of a low amount of the oxides of nitrogen. Delayed mixing of the stratified charge is achieved by placement of at least one Helmholtz resonator cavity in the head or closed end of each combustion chamber. The Helmholtz resonator cavity communicates with the top end of the main combustion chamber via a narrow slot. On the intake stroke of each engine cylinder, the main chamber is filled with a slightly fuel rich gaseous charge while the companion Helmholtz resonator cavity is filled with air. During the compression stroke some of the rich air-fuel mixture is forced into the resonator cavity via the communicating slot. At or near TDC, the air-fuel mixture in the main chamber is ignited. As the flame front progresses across the chamber a rapid increase in pressure serves not only to power the piston, but also to initiate a resonant reaction in the Helmholtz resonator cavity which results in a transfer of the unburned gases therein into the main combustion chamber. This both sustains the power stroke and at the same time lowers the peak flame temperature in the main chamber.

REFERENCES:
patent: 3987776 (1976-10-01), Goto et al.
patent: 4060059 (1977-11-01), Bodine, Jr.

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