Method for operating a diesel engine in a homogeneous charge compression ignition combustion mode under idle and light-load operating conditions
OwnerYiqun Huanginventor
Life of this patent
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Abstract
Intake air is restricted to provide an intake manifold pressure that is below the pressure of the ambient atmosphere. Fuel is injected into each combustion chamber at a position of between 15° and 45° BTDC to achieve HCCI combustion under idle and light load operating conditions.
Claims11
A method for operating a diesel engine in a homogeneous charge compression ignition combustion mode under idle and light load operating conditions, comprising;
- providing an intake manifold pressure of less than 100 kpa-absolute;
- and,
- injecting liquid fuel into each combustion chamber when a piston reciprocally disposed therein is at a position between about 15° and 45° BTDC during a compression stroke prior to combustion;
- and,
- maintaining said intake manifold pressure at a pressure less than 100 kPa absolute sufficient to completely vaporize said injected liquid fuel prior to combustion of the fuel.
(canceled)
A method for operating a diesel engine in a homogeneous charge compression ignition combustion mode under idle and light load operating conditions, said engine having a variable valve actuation system adapted to control the opening and closing of at least the intake valves associated with respective combustion chambers, said method comprising:
- injecting liquid fuel into each combustion chamber of the engine when a piston reciprocally disposed therein is at a position between about 15 E and 45 E BTDC during a compression stroke prior to combustion of said injected fuel;
- and,
- simultaneously controlling the closing of said intake valves to restrict intake air flow into each combustion chamber and provide an in-cylinder pressure of less than 100 kpa-absolute sufficient to completely vaporize the liquid injected fuel prior to combustion of the fuel.
Dependencies are inferred from the claim text.