Six-stroke engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsEi Tsukahara, Takurou Kamichika
Life of this patent
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Abstract
A six-stroke engine includes a cylinder, a piston, a cylinder head, a combustion chamber, cylinder injector, a spark plug, an intake port, an exhaust port, an intake valve, an exhaust valve, a valve gear, and a control device. The valve gear operates the intake valve and the exhaust valve to execute six strokes including an intake stroke, a compression stroke without ignition, an expansion stroke without combustion, a compression stroke with ignition, an expansion stroke with combustion, and an exhaust stroke in this order. The control device is programmed to cause the cylinder injector to inject fuel and to energize the spark plug in the compression stroke with ignition.
Claims11
A six-stroke engine comprising:
- a cylinder;
- a piston inserted into the cylinder;
- a cylinder head attached to the cylinder;
- a combustion chamber surrounded by the cylinder, the piston, and the cylinder head;
- a cylinder injector that directly injects fuel into the combustion chamber;
- a spark plug attached to a wall of the combustion chamber;
- an intake port provided in the cylinder head and including a downstream end open to the combustion chamber;
- an exhaust port provided in the cylinder head and including an upstream end open to the combustion chamber;
- an intake valve provided in the cylinder head to open/close the intake port;
- an exhaust valve provided in the cylinder head to open/close the exhaust port;
- a valve mechanism that operates the intake valve and the exhaust valve to execute six strokes including an intake stroke, a compression stroke without ignition, an expansion stroke without combustion, a compression stroke with ignition, an expansion stroke with combustion, and an exhaust stroke in this order;
- and a control device programmed to cause the cylinder injector to inject the fuel and to energize the spark plug during the compression stroke with ignition.
A method of operating a six-stroke engine, the six-stroke engine comprising:
- a cylinder;
- a piston inserted into the cylinder;
- a cylinder head attached to the cylinder;
- a combustion chamber surrounded by the cylinder, the piston, and the cylinder head;
- a cylinder injector that directly injects fuel into the combustion chamber;
- a spark plug attached to a wall of the combustion chamber;
- an intake port provided in the cylinder head and including a downstream end open to the combustion chamber;
- an exhaust port provided in the cylinder head and including an upstream end open to the combustion chamber;
- an intake valve provided in the cylinder head to open/close the intake port;
- and
- an exhaust valve provided in the cylinder head to open/close the exhaust port;
- the method comprising the steps of:
- causing the engine to execute six strokes including an intake stroke, a compression stroke without ignition, an expansion stroke without combustion, a compression stroke with ignition, an expansion stroke with combustion, and an exhaust stroke in this order;
- and
- causing the cylinder injector to inject the fuel and to energize the spark plug in the compression stroke with ignition.
Dependencies are inferred from the claim text.