Abstract: An internal combustion engine in one embodiment includes a number of cylinders each having a crank piston connected to an engine crankshaft and disposed within a combustion chamber. Each cylinder includes a valve seat projecting inward from cylinder wall offset from the top dead center position of the crank piston. A free piston is slidingly disposed within the cylinder between the head end and the valve seat. The free piston has an outer diameter that is less than the inner diameter of the cylinder to permit leakage of combustion gas past the free piston. The free piston also includes a lower face opposing the crank piston with an annular groove defined in the lower face configured for sealing engagement with the valve seat. The free piston defines a pressure chamber that is pressurized during the by combustion process when the free piston is disposed apart from the valve seat.

Abstract: A supplemental cylinder head assembly for operation of an engine in a homogeneous charge compression ignition combustion mode. The supplemental cylinder head assembly provides a movable accumulator piston position above the main combustion chamber. The accumulator piston is upwardly responsive to the combustion event in the main combustion chamber and downwardly to a preload force. An engine adapted to receive the supplemental cylinder head assembly is capable of efficiently operating on any fuel in the octane range of zero to 130.

Abstract: Conventional cylinders of internal combustion engines comprise a cylinder chamber of constant size so that there is an unchangeable compression chamber between the top dead center position of the piston and the cylinder head. To be able to vary the size of the cylinder chamber and thus the volume of the compression chamber and to thereby adjust a respectively optimum compression, the cylinder head of the cylinder of the invention has arranged therein an insert whose position is hydraulically adjustable, the compression chamber being enlarged by lifting the insert, while it is reduced by lowering the insert. The position of the insert is controlled through a microprocessor in conjunction with a lambda probe.

Abstract: An optimized unitary energetic system for an internal combustion engine comprising a gas distribution system for intake and exhaust associated with an optimized variable geometry combustion chamber with a regenerative cylinder wall lining to contain thermal energy and a microprocessor to correlate certain factors and control the gas distribution system and combustion chamber geometry for optimization of engine operation.

Abstract: A variable compression system for internal combustion engines whose compression ratio is varied by hydraulic regulation of back and forth movement of a sub-piston slidably mounted within a sub-cylinder communicated with a combustion chamber, comprising a control valve for controlling pressure oil supply to a pressure oil chamber formed on a back face of the sub-piston and communicated, via passages, with a spill port for pressure oil release which is formed in a hollow, reciprocative member cooperatively connected to the sub-piston and relatively movably mounting a spilling regulation member thereon.

Abstract: The swash plate engine is provided with an Aspin type rotary valve system with a variable compression capability. The engine may be of four-piston type or six-piston type. The size of the combustion chambers can be changed from time to time to vary the compression ratio.The engine may also be coupled with an accumulator to store the energy of braking for subsequent acceleration of the engine.

Abstract: A cam operated internal combustion engine of piston type positive displacement variety, having novel piston-to-cam connecting means. The pistons are cam operated to optimize the aspiration, combustion and expansion process. Executed in axial and radial cam versions, with alternatively a two cycle, four cycle or novel three cycle mode of operation. The arrangements provide advantages in manufacturing and construction, as well as improved thermal efficiencies.

Abstract: The clearance volume of a combustion chamber of an internal combustion engine at the same crankangle is varied by changing the location of a small piston reciprocally disposed in a small cylinder formed in a cylinder head, which small cylinder communicates with an engine cylinder. Changing the location of the small piston is controllable through a link mechanism in response to the movement of a throttle valve for controlling the amount of intake air supplied to the combustion chamber.

Abstract: An engine capable of storing high pressure gases and discharging them to increase the pressure of compressed fuel-mixture. A gas storage chamber is provided adjacent to the combustion chamber. The chamber opens to release high pressure gases just prior to ignition and closes just after ignition to store ignited gases until just prior to the next ignition. The working efficiency of an engine goes up as its compression ratio increases.

Abstract: A device to fit existing engines for the purpose of increasing compressed fuel-mixture pressure and promoting a compression ratio of the fuel-mixture in an engine to enable the fuel-mixture to burn more perfectly and the engine to works more efficiently.In the prior application of the same petitioner, titled "Pressure Addible Engine" with the same purpose to the invention but built in an unit engine which shall request people to throw the used engine away. In incentive of that, present invention modifies the prior invention into independent device unit, suitably fit to existing gasoline engine or diesel engine and makes the invention to be acceptable popularly.

Abstract: The engine comprises, for each of its cylinders, an auxiliary piston provided with a piston rod. The piston is movable in a cavity which is formed in the cylinder head and opens into the combustion chamber. The cavity defines with the auxiliary piston an annular chamber around the piston rod. A liquid under pressure is supplied to the annular chamber by way of a check-valve. The rod has an axial bore in which is slidable a slide valve member whose position is under the control of a parameter representing the conditions of operation of the engine. The slide valve member cooperates with at least one escape port formed across the hollow rod to constitute a liquid discharge path for the annular chamber.

Abstract: A mixture-compressing, spark-ignited internal combustion engine has a combined throttle and compression control. The engine has at least one main piston sliding in a main cylinder and driving a crankshaft, and an auxiliary piston sliding in an auxiliary cylinder, which auxiliary piston is driven at half the frequency of the crankshaft by a drive shaft activated by a drive means coupled to the crankshaft. The compression chamber formed by the auxiliary piston is connected with the compression chamber formed by the main piston, and a control device is provided for modification of the phase piston of the auxiliary piston relative to the main piston so as to achieve a compression chamber volume at compression top dead center of the main piston which is variable as a function of the operating parameters of the internal combustion engine.

Abstract: A two-part variable compression ratio cylinder is provided having inner and outer sleeves wherein relative movement between the sleeves varies the volume of the combustion chamber and hence varies the compression ratio of the engine. Hydraulic means responsive to the pressure in the combustion chamber automatically varies the position of the inner and outer sleeves to regulate the combustion chamber volume. The hydraulic controls are located entirely in the cylinder head facilitating the conversion of any internal combustion engine without altering the piston size.

Abstract: A two-part variable compression ratio cylinder is provided having inner and outer sleeves wherein relative movement between the sleeves varies the volume of the combustion chamber and hence varies the compression ratio of the engine. Hydraulic means responsive to the pressure in the combustion chamber automatically varies the position of the inner and outer sleeves to regulate the combustion chamber volume. The cylinder is adaptable to engines of any type.

Abstract: A two part variable compression ratio (VCR) piston assembly having an outer member movable relative to an inner member to vary the compression ratio of an internal combustion engine and a hydraulic system utilizing oil from the lubrication system of the engine for automatically controlling the relative movement of the members to maintain a predetermined maximum combustion chamber pressure. A hydraulic circuit includes an upper and a lower chamber which expands and contracts conversely upon relative movement of the piston members and a system for supplying oil to the upper chamber and to the lower chamber via the upper chamber and for discharging the oil from the upper chamber in a manner which gradually changes the compression ratio of the piston until a predetermined maximum combustion chamber pressure has been achieved and which tends to maintain the maximum combustion chamber pressure after it has been achieved.

Abstract: The internal combustion engine comprises one or more cylinders in which a main piston provides the means to drive a drive shaft, there is a cylinder head over the cylinders. Auxiliary pistons slide in each auxiliary cylinder in the cylinder head and each communicating with the main cylinder. The auxiliary piston moves up or down to change the compression ratio of each cylinder, each auxiliary cylinder is ported with a hydraulic pressure fluid supply for movement of the auxiliary piston to increase compression and ported to an exhaust to decrease compression, said porting is controlled by a differential resolver that is actuated by the throttle.

Abstract: A spring-loaded piston is slidably arranged in an auxiliary chamber opening into the combustion chamber of an internal combustion engine. The spring-loading of the piston is preset so that the piston retracts at a certain high pressure attained during the combustion process, thereby increasing the combustion chamber volume. This enables higher compression ratios to be used than is otherwise possible.