Two stroke internal combustion engine
Assigneeinnogy SE
InventorsMichael Willboughby Essex Coney, Roger Richards
Life of this patent
Estimating the term…
Abstract
A two stroke internal combustion engine having a compressed air inlet port and an exhaust port the flow through which is controlled by suitable valves. Fuel is injected through a fuel injector. The timing of the opening of the valve is such that, as the piston approaches top dead centre and with the air inlet valve closed, the exhaust valve is closed such that some exhaust gas is trapped and compressed in the combustion chamber thereby increasing the temperature within the combustion chamber and hence facilitating ignition. The invention also contemplates initiating combustion before the air inlet valve is closed.
Claims79
A two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having a compressed air inlet port with an air inlet valve for controlling flow into the combustion chamber, a fuel injector through which fuel is injected into the combustion chamber, and an exhaust port with an exhaust valve for controlling flow out of the combustion chamber;
- and control means for controlling the air inlet and exhaust valves in relation to the motion of the piston such that the exhaust valve is closed substantially before the piston reaches top dead centre and substantially before the air inlet valve is opened, such that some exhaust gas is trapped and compressed in the combustion chamber.
A method of operating a two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having a compressed air inlet port with an air inlet valve for controlling flow into the combustion chamber, a fuel injector, and an exhaust port with an exhaust valve for controlling the flow out of the combustion chamber;
- the method comprising repeating the steps of:
- opening the exhaust valve;
- moving the piston into the combustion chamber to force exhaust gas from the combustion chamber;
- closing the exhaust valve before the piston reaches top dead centre and trapping some exhaust gas in the combustion chamber;
- compressing the exhaust gas by further movement of the piston;
- initiating the opening of the air inlet valve;
- and introducing fuel into the combustion chamber once the exhaust gas has been compressed to the extent that the temperature in the combustion chamber is sufficient to ignite and combust the fuel expanding the hot combustion gases so as to perform work on the piston.
A two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having a compressed air inlet port with an air inlet valve for controlling flow into the combustion chamber, a fuel injector through which fuel is injected into the combustion chamber, and an exhaust port with an exhaust valve for controlling flow out of the combustion chamber;
- and control means for controlling the air inlet valve in relation to the combustion in the combustion chamber, such that the air inlet valve is not closed before combustion is initiated.
A method of operating a two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having a compressed air inlet port with an air inlet valve controlling flow into the combustion chamber, a fuel injector and an exhaust port with an exhaust valve for controlling the flow out of the combustion chamber;
- the method comprising repeating the steps of:
- opening the exhaust valve;
- moving the piston into the combustion chamber to force exhaust gas from the combustion chamber;
- closing the exhaust valve;
- injecting fuel, initiating the opening of the air inlet valve and initiating combustion;
- and subsequently closing the air inlet valve, such that the air inlet valve is not closed before combustion is initiated.
A two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having:
- at least one compressed air inlet port with an associated air inlet valve for controlling flow into the combustion chamber, the or each air inlet port associated with a column defined as the envelope formed by the translation of the area of the inlet port in the direction in which the piston reciprocates;
- at least one exhaust port with an exhaust valve for controlling flow out of the combustion chamber;
- and a fuel injector through which fuel is injected into the combustion chamber, the fuel injector being arranged to direct a total of at least 50% of the fuel directly towards individual ones of the column or columns but not towards the or each air inlet valve.
A method of operating a two stroke internal combustion engine comprising at least one cylinder, the or each cylinder having a piston reciprocably movable within the cylinder and defining a combustion chamber, the or each combustion chamber having:
- at least one compressed air inlet port with an air inlet valve controlling flow into the combustion chamber, each port being associated with a column defined as the envelope formed by the translation of the area of the inlet port in the direction in which the piston reciprocates;
- at least one exhaust port with an exhaust valve for controlling the flow out of the combustion chamber;
- and a fuel injector for injecting fuel into the combustion chamber;
- the method comprising the step of injecting at a total of at least 50% of the fuel directly towards individual ones of the column or columns but not towards the or each air inlet valve.
Dependencies are inferred from the claim text.