Dual combustion mode engine

Details Dual combustion mode engine Dual combustion mode engine

2007-08-14

2007-08-14

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

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C060S320000, C060S605200, C123S568200, C701S108000

Reexamination Certificate

active

11276217

ABSTRACT:
In an engine in which a first portion of engine cylinders operate in HCCI combustion mode only and a second portion of engine cylinders operate in SI combustion mode only, two EGR ducts and valves are provided: a first EGR duct adapted to provide flow from an exhaust of HCCI engine cylinders to an intake of HCCI cylinders; a first EGR valve disposed in the first EGR duct; a second EGR duct adapted to provide flow from an exhaust of SI cylinders to an intake of HCCI cylinders via a first EGR valve; and a second EGR valve disposed in the second EGR duct. By adjusting the EGR valves, the intake temperature to HCCI cylinders is controlled. During cold start, the second EGR valve is opened to pull SI exhaust through HCCI cylinders for the purpose of preheating HCCI cylinders.

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