Abstract: A method for operating a four-stroke internal combustion engine and a four-stroke combustion engine configured to be operated by the same are disclosed. The method comprises injecting compressed gas into a cylinder during the exhaust stroke of the combustion cycle. In another aspect of the invention, the injection occurs at a time in the combustion cycle near the end of the exhaust stroke, the cylinder approaching Top Dead Center. In a still further aspect of the invention, the gas comprises air.

Abstract: An electronic valve actuation system and control method is described. The valve timing is changed between early and late intake valve closing depending on engine operating conditions. Further, valve timing is adjusted to control engine airflow or engine torque. Finally, air-fuel ratio is adjusted based on feedback from an exhaust gas oxygen sensor as well as an estimate of air, fuel, and residual exhausted from cylinders operating with late valve closing (after bottom dead center) timing.

Abstract: An internal combustion engine and a method of operating said engine, the engine having a plurality of cylinders (3,4,5) each respectively supporting a piston (6) therein, a fuel injection system (2) including a plurality of selectively operable delivery injector nozzles (10), and a gas supply system (7) for supplying gas to the delivery injector nozzles (10), each delivery injector nozzle (10) arranged to respectively deliver fuel by way of said gas directly into a said engine cylinder (3,4,5), the method including opening the delivery injector nozzles (10) of a first said cylinder and a second said cylinder such that gas within the first said cylinder is transferred through the delivery injector nozzle (10) thereof and into the gas supply system (7) resulting in gas being supplied to the delivery injector nozzle (10) of the second said cylinder to thereby effect the delivery of fuel by way of the gas to the second said cylinder.

Abstract: An ignition method for a multi-cylinder reciprocating gas engine wherein, in order to start a combustion cycle, a compressed, substantially homogeneous and not self-igniting combustion gas-air mixture contained in the corresponding cylinder chamber to be fired is ignited by the direct injection of a small amount of combustion gas. The injected small amount of combustion gas, which serves as the ignition gas, is injected onto a hot surface in the region of the combustion chamber. The beginning of the injection is predetermined depending on the position of the crankshaft, and is controlled by an engine control unit.

Abstract: The present invention relates to a compressed gas supply system in an internal combustion engine which may be used for example for an air-assisted or an air-driven fuel injector.

Abstract: A air charging valve for use with a air forced fuel injection system. The charging valve admitting and storing compressed air from the engine cylinder and releasing it into the fuel injector to force out the air/fuel mixture into the engine cylinder. The charging valve will accept the pressurized air from the engine cylinder without allowing any air to escape back into the combustion chamber once it is in the air charging valve. The fuel injection system includes an injector having a fuel and air mixing chamber that includes a normally closed injector valve; the chamber being for premixing air and fuel before introduction of the compressed air which causes the fuel injection event.

Abstract: A hydraulically operated valve with controlled lift, in particular a fuel/gas injection valve for internal combustion engines, has a stop face fixed on the valve stem. For accurate control of the opening of the valve a stop cam is provided, which is drivn mechanically via a friction clutch, and which cooperates with the stop face. By rotating the cam through a predetermined angle the maximum valve lift will be obtained. The cam may be brought into contact with the stop face even in the closed position of the valve.

Abstract: Scavenging a cylinder of an engine with fuel-free fresh air and injection with atomized liquid fuel by a pressurized gas are accomplished independently, at specific moments during by the operating cycle of the engine. The fuel is atomized and injected into the cylinder by gases tapped from cylinder of the engine. The injection device can comprise a reservoir in which the gases tapped from cylinder are stored. The gases can be tapped from cylinder by a pneumatic injector when the valve opens.

Abstract: A fuel injected internal combustion engine and a method of operating same, the engine having a fuel injection system wherein fuel is injected through a selectively openable injector nozzle directly into a combustion chamber of the engine by gas from a pressurized gas supply system. While the engine is being cranked during start-up of the engine, the injectory nozzle is opened to communicate said combustion chamber with the gas supply system. Gas compressed within the combustion chamber enters into the gas supply system to assist in rapidly establishing gas pressure for subsequent operation of the fuel injection system.

Abstract: A fuel control system for an internal combustion engine includes means for pneumatically amplifying sensed air flow pressure differential through an air intake venturi between a first combustion air pressure sensor outside the venturi and a second combustion air pressure sensor in the venturi. Pressure at the inner end of the second pressure sensor is reduced by altering the air flow path to create a vacuum at the inner end of the second pressure sensor relative to the remaining air flow through the venturi. A throttle plate in the venturi has a by-pass hole therethrough directing air flow along a given direction past the inner end of the sensor and through the by-pass hole when the throttle plate is in the idle position. The given direction of air flow past the inner end of the sensor prevents air flow into the inner end of the sensor tube to prevent an increase of sensed pressure thereat, and instead creates a vacuum to pull air out of the inner end of the sensor tube, to reduce pressure thereat.

Abstract: Disclosed herein is an internal combustion engine comprising first and second cylinders respectively including head ends and side walls, first and second pistons respectively reciprocably movable in the first and second cylinders between top dead center and bottom dead center positions, one of the first and second pistons being adjacent top dead center position when the other of the first and second pistons is adjacent bottom dead center position, a fuel supply venturi extending between the cylinders and including a throat, and a fuel injector located adjacent the head ends of the first and second cylinders, communicating with the throat, and including a valve movable between a closed position and an open position affording fuel flow into the throat.

Abstract: A two cycle internal combustion engine is provided with a fuel system including a low pressure fuel pump (204) and solenoid valve (206) supplying and metering fuel to the engine crankcase through a fuel line, without a carburetor, without a high pressure fuel pump, without high pressure fuel injectors, and without a constant fuel pressure regulator. The system senses the amount of combustion air supplied to the engine, and senses fuel flow velocity using a restriction orifice in the fuel line producing a fuel pressure drop indicating fuel flow velocity. A conduit is connected between the crankcase at a transfer passage and the fuel line downstream of the restriction orifice and passes warm presurized air-fuel mixture from the crankcase through the transfer passage to the fuel line to improve fuel atomization.

Abstract: A device and method are provided for the pneumatic injection of fuel into an engine. The device comprises at least one auxiliary duct having two ends one of which is connected to an exhaust pipe and the other to an injection member.

Abstract: A device and method are provided for the pneumatic injection of fuel into an engine. The device comprises at least one auxiliary duct having two ends one of which is connected to an exhaust pipe and the other to an injection member.