Method of modifying exhaust valve timing to improve engine...

Details Method of modifying exhaust valve timing to improve engine... Method of modifying exhaust valve timing to improve engine...

2007-07-03

2007-07-03

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C123S316000, C123S090150, C060S285000

Reexamination Certificate

active

11159275

ABSTRACT:
A method for actuating one or more exhaust valves in an internal combustion engine during positive power operation is disclosed. The expansion stroke of an engine cylinder is effectively lengthened and the exhaust stroke is effectively shortened by delaying the opening and/or advancing the closing of the exhaust valve relative to conventional exhaust valve timing during the exhaust stroke. Selective variation of the exhaust stroke during positive power operation of the engine may reduce NOx production.

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