Engine combustion chamber and method of operation

Internal-combustion engines – Four-cycle – Multiple exhaust

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123 9015, F01L 902

Patent

active

058265600

ABSTRACT:
Several embodiments of multi-valve internal combustion engines, wherein low-speed hydrocarbon emissions are reduced by restricting the opening of at least one of the exhaust valves under this running condition. In addition, and in accordance with at least one of the embodiments, one of the intake valves is partially open during a portion of the exhaust cycle to further improve emission control.

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patent: 4541372 (1985-09-01), Weiss
patent: 4587936 (1986-05-01), Matsuura et al.
patent: 4615309 (1986-10-01), Yoshikawa
patent: 4779589 (1988-10-01), Matsuura et al.
patent: 4964375 (1990-10-01), Takeyama et al.
patent: 5072700 (1991-12-01), Kawamura
patent: 5269270 (1993-12-01), Suzuki et al.

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