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A combustion process for a stratified charge reciprocating internal combustion engine having a high pressure fuel injection system with two injectors discharging into the combustion chamber; the fuel from the first nozzle is ignited as it discharges and the heat from the burning fuel raises the temp

A combustion process for a stratified charge reciprocating internal combustion engine having a high pressure fuel injection system with two injectors discharging into the combustion chamber; the fuel from the first nozzle is ignited as it discharges and the heat from the burning fuel raises the temperature and pressure and chemically conditions the gas in the combustion chamber so fuel from the second injector is auto ignited as it is discharged into the combustion chamber. To provide the two injections of fuel, a simplified, electrically triggered, accumulator type multi-fuel injection system is preferred.

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A combustion process for use in a reciprocating internal combustion engine having at least one cylinder and a piston reciprocally movable in said cylinder to define a variable volume combustion chamber, said process comprising the steps of supplying air to the combustion chamber, said air being admi

A combustion process for use in a reciprocating internal combustion engine having at least one cylinder and a piston reciprocally movable in said cylinder to define a variable volume combustion chamber, said process comprising the steps of supplying air to the combustion chamber, said air being admitted to the combustion chamber through an intake passage which is substantially unthrottled thereby providing a minimum restriction on the intake of incoming air, said air entering the combustion chamber in a flow path independent of any special air flow pattern or swirl pattern requirement to accommodate ignition of the fuel, compressing the air in the chamber, introducing a pilot fuel charge from a first fuel nozzle into the combustion chamber after the air therein has been partially compressed, igniting the pilot fuel charge substantially immediately upon its issuing into the combustion chamber to cause a pilot fuel burn, the energy derived from said pilot fuel burn serving to increase the temperature and pressure of the gas in the combustion chamber, and subsequent to said pilot fuel burn introducing a main fuel charge from a second fuel nozzle into said combustion chamber whereby auto ignition of said main fuel occurs, said main fuel injected into the combustion chamber by said second nozzle being in a spray pattern shaped to fit the combustion chamber for best burning efficiency rather than being in a spray pattern which provides contact with a flame front established by the ignition of the pilot fuel, the engine power output being controlled by varying the quantity of main fuel charge injected by said second nozzle, whereby the air-fuel ratio will vary with load changes but will always be substantially in the lean mixture range, said internal combustion engine with which said process is used having a compression ratio which is in a range characteristic of the compression ratio range of a carbureted engine, whereby the internal combustion engine with which said process is used may have a structural strength design characteristic of that of a carbureted engine rather than the heavy structure of a compression ignition engine. A stratified charge reciprocating internal combustion engine comprising a crankcase having at least one cylinder and supporting a cylinder head which houses an air inlet valve and an exhaust valve for said cylinder, air being admitted to said combustion chamber through an air inlet passage which is substantially unthrottled, thereby providing a minimum of restriction on the charge of incoming air, said air inlet passage being openable and closable by said air inlet valve, said air entering the combustion chamber in a flow path independent of any special air flow pattern or swirl pattern requirement to accommodate ignition of the fuel, a piston reciprocally movable in said cylinder to define a variable volume combustion chamber, a pilot fuel injection nozzle mounted in said cylinder head and positioned to discharge a pilot fuel charge into said combustion chamber, ignition means mounted in said cylinder head and positioned adjacent said pilot fuel injection nozzle, a main fuel injection nozzle mounted in said cylinder head and positioned to discharge a main fuel charge into said combustion chamber, means for causing said pilot fuel injection nozzle to discharge a pilot fuel charge into said combustion chamber and for causing said ignition means to ignite said pilot fuel charge as it is discharged into said combustion chamber to thereby cause a pilot fuel burn, the energy derived from said pilot fuel burn serving to increase the temperature and pressure of the gas in the combustion chamber, and means for causing said main fuel injection nozzle to discharge a main fuel charge into said combustion chamber on the compression stroke of said piston subsequent to said pilot fuel burn whereby auto ignition of said main fuel occurs, said main fuel injected into the combustion chamber by said main fuel nozzle being in a spray pattern shaped to fit the combustion chamber for best burning efficiency rather than being in a spray pattern which provides contact with a flame front established by the ignition of the pilot fuel, means for controlling the engine power output by varying the quantity of main fuel charge injected by said main fuel injection nozzle, whereby the air-fuel ratio will vary with load changes but will always be substantially in the lean mixture range, said internal combustion engine having a compression ratio which is in a range characteristic of the compression rato of a carbureted engine, whereby the internal combustion engine has a structural strength design characteristic of that of a carbureted engine rather than the heavy structure of a compression ignition engine.