Homogeneous charge compression ignition internal combustion engine that performs EGR, and ignition timing control method for the engine
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorHiroshi Kuzuyama
Life of this patent
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Abstract
A combustion chamber of a homogeneous charge compression ignition internal combustion engine that performs EGR communicates with an intake passage and an exhaust passage. The combustion chamber is opened and closed to the intake passage with an intake valve, and is opened and closed to the exhaust passage with an exhaust valve. The closing timing of the exhaust valve in the exhaust stroke is advanced relative to the top dead center of the piston. A supercharger of a variable supercharging pressure type is located in the intake passage. This configuration expands the operational range of the engine to a higher load region.
Claims18
A homogeneous charge compression ignition internal combustion engine that performs EGR, the engine comprising:
- a piston;
- a combustion chamber;
- intake and exhaust passages that communicate with the combustion chamber;
- an intake valve that opens and closes the combustion chamber to the intake passage;
- an exhaust valve that opens and closes the combustion chamber to the exhaust passage, wherein the closing timing of the exhaust valve is advanced to a point prior to the point at which the piston reaches the top dead center in the exhaust stroke;
- a supercharger located in the intake passage, the supercharger being of a variable supercharging pressure type;
- and
- a supercharger controlling section that controls the supercharger to change supercharging pressure according to a demanded load of the engine, thereby controlling the ignition timing of premixture in the combustion chamber.
A homogeneous charge compression ignition internal combustion engine that performs EGR, the engine comprising:
- a piston;
- a combustion chamber;
- intake and exhaust passages that communicate with the combustion chamber;
- an intake valve that opens and closes the combustion chamber to the intake passage;
- an exhaust valve that opens and closes the combustion chamber to the exhaust passage, wherein the closing timing of the exhaust valve is advanced to a point prior to the point at which the piston reaches the top dead center in the exhaust stroke;
- and
- a supercharger located in the intake passage, the supercharger being of a variable supercharging pressure type,
- wherein the engine is used for driving a compressor in a gas heat pump that performs heat pump cycle for air conditioning.
A method for controlling ignition timing of a homogeneous charge compression ignition internal combustion engine that includes a piston, a combustion chamber, and intake and exhaust passages that communicate with the combustion chamber, the method comprising:
- opening and closing the combustion chamber to the intake passage with an intake valve in the intake stroke of the piston;
- opening and closing the combustion chamber to the exhaust passage with an exhaust valve in the exhaust stroke of the piston, wherein the exhaust valve closes before the piston reaches the top dead center in the exhaust stroke;
- and
- changing supercharging pressure of a supercharger, which is of a variable supercharging pressure type and is located in the intake passage, according to a demanded load of the engine, thereby controlling the ignition timing of premixture in the combustion chamber.
Dependencies are inferred from the claim text.