An internal combustion engine in which a power generating cylinder has a piston drivingly coupled with a piston in a combustible fluid compressing cylinder by means of gears connected with a power delivery shaft and which are adjustable to vary the timed operating relationship at which the pistons reach their respective dead center positions, the compressing cylinder having a valve controlled inlet for a combustible fluid which is precompressed therein and delivered through an interconnecting va...

A rotary fluid engine powered by externally pressurized working fluid including a rotor and a plurality of swinging arms positioned to engage with and impart a torque force to the rotor when the arms are driven sequentially inward by the selective admission of charges of externally pressurized working fluid. A first segment on the rotor surface engages the free end of each arm as the arm is driven inwardly and a second segment on the rotor surface operates to return the arm outwardly after the p...

An engine comprising an exhaust gas recirculation system, wherein a first combustion where the amount of the recirculated exhaust gas supplied to the combustion chamber is larger than the amount of recirculated exhaust gas where the amount of production of soot peaks and almost no soot is produced and a second combustion where the amount of recirculated exhaust gas supplied to the combustion chamber is smaller than the amount of recirculated exhaust gas where the amount of production of soot pea...

An internal combustion engine includes at least one cylinder, a piston reciprocating in the cylinder, and a combustion chamber defined by the piston and the cylinder. The cylinder has an intake for supplying a mixture of air and fuel to the combustion chamber and an exhaust for releasing exhaust gases from the combustion chamber. An intake valve is operatively positioned in the intake, and an exhaust valve is operatively positioned in the exhaust. A compressor is designed to pressurize the air, ...

In an engine having a cylinder head which forms a portion of an engine body and is provided with an intake valve operated for opening and closing operations by an intake valve operating device having an intake camshaft and an exhaust valve driven for opening and closing operations by an exhaust valve operating device having an exhaust camshaft, the intake camshaft (30) is placed higher in position than the exhaust camshaft (35) by increasing the distance between the intake camshaft (30) and a co...

An engine, having an intake passage, a throttle valve arranged in the intake passage, and a fuel injector arranged in the intake passage for injecting fuel into the intake passage, comprises an air-flow control valve arranged in the intake passage between the fuel injector and the throttle valve. The air-flow control valve is controlled to close during the engine starting operation, and to open after the engine starting operation completes. The air-flow control valve has a valve element having a...

An engine, having an intake passage, a throttle valve arranged in the intake passage, and a fuel injector arranged in the intake passage for injecting fuel into the intake passage, comprises an air-flow control valve arranged in the intake passage between the fuel injector and the throttle valve. The air-flow control valve is controlled to close during the engine starting operation, and to open after the engine starting operation completes. The air-flow control valve has a valve element having a...

An exhaust arrangement for an internal combustion engine wherein the timing of the cylinder events is such that the exhaust port of one cylinder opens before the exhaust port of another cylinder closes so as to improve scavenging and performance. In preferred embodiments, the engine is of a 2-cycle type and the exhaust port of the one cylinder also opens before the scavenge port of the other cylinder closes. The principle is also depicted in conjunction with a four cylinder engine.

An engine, having an intake passage, a throttle valve arranged in the intake passage, and a fuel injector arranged in the intake passage for injecting fuel into the intake passage, comprises an air-flow control valve arranged in the intake passage between the fuel injector and the throttle valve. The air-flow control valve is controlled to close during the engine starting operation, and to open after the engine starting operation completes. The air-flow control valve has a valve element having a...

An internal combustion engine has an annular rotor (2) arranged to rotate around a stator (6). The stator has a pair of combustion cylinders (19) extending therethrough with each cylinder containing a slideable piston (18). The pistons are coupled to a central rotating shaft (4) which produces antiphase motion of the pistons in their respective cylinders. Combustible fluid is fed into each of the cylinders (19) in turn to be compressed by the action of the pistons (18). The rotor (2) has a first...