Dual combustion mode engine
AssigneeFord Global Technologies, LLC
InventorsJohn Brevick, Diana D. Brehob
Life of this patent
Estimating the term…
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.
Claims21
An internal combustion engine, comprising:
- a first portion of engine cylinders;
- a second portion of engine cylinders;
- a first exhaust gas recirculation duct adapted to provide flow from an exhaust of said first portion of engine cylinders to an intake of said first portion of engine cylinders;
- a first exhaust gas recirculation valve disposed in said first exhaust gas recirculation duct;
- a second exhaust gas recirculation duct adapted to provide flow from an exhaust of said second portion of engine cylinders to an intake of said first portion of engine cylinders via a first exhaust gas recirculation valve;
- and
- a second exhaust gas recirculation valve disposed in said second exhaust gas recirculation duct.
A method for controlling an internal combustion engine, comprising:
- adjusting a valve position of a crossover exhaust gas recirculation valve, said crossover exhaust gas recirculation valve being disposed in an exhaust gas recirculation duct between an intake of a first portion of engine cylinders and an exhaust of a second portion of engine cylinders wherein said first and second portions are mutually exclusive, gases passing through said exhaust gas recirculation valve are provided exclusively from said exhaust of said second portion of engine cylinders, and said gases are provided exclusively to said first portion of engine cylinders.
A computer readable storage medium having stored data representing instructions executable by a computer, comprising:
- instructions to adjust a valve position of a crossover exhaust gas recirculation valve, said crossover exhaust gas recirculation valve being disposed in an exhaust gas recirculation duct between an intake of a first portion of engine cylinders and an exhaust of a second portion of engine cylinders wherein said first and second portions are mutually exclusive wherein intakes of said first and second portions of engine cylinders are separated and exhausts of said first and second portions of engine cylinders are separated.
Dependencies are inferred from the claim text.