Constant pressure-temperature delayed combustion high compressio

Internal-combustion engines – Noncompression

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123 32ST, 123193P, F02N 3502

Patent

active

040504204

ABSTRACT:
A spark ignition internal combustion engine arrangement and method of operation are provided including high compression, in the range between about 17 to 1 and 30 to 1 of a lean mixture of air and fuel of sufficiently high octane to prevent preignition and detonation when compressed, late ignition of the charge, near top dead center, for combustion during the first part of the expansion phase with heat release controlled by the shape of the combustion chamber to obtain essentially constant pressure combustion up to a predetermined maximum temperature with the remaining fuel being burned at substantially constant temperature. This cycle requires a high initial rate of heat release for the constant pressure combustion portion of the burn followed by a much lower rate during the constant temperature portion. A combustion chamber and engine arrangement for operating on the novel cycle are also disclosed.

REFERENCES:
patent: 2323028 (1943-06-01), Glamann
patent: 2534346 (1950-12-01), Fenney
patent: 2736306 (1956-02-01), McDuffie
patent: 3583373 (1971-06-01), Hardenberg
patent: 3776212 (1973-12-01), Karlowitz
patent: 3923015 (1975-12-01), Mukai et al.

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