Abstract: A device for the operation of a valve (5) to the combustion chamber (6) of a combustion engine, wherein the combustion engine comprises a cylinder, a piston (3) displacably arranged in the cylinder (2), and a combustion chamber (6) delimited by the cylinder (2) and the piston (3), and said valve (5), and wherein the device comprises a valve actuator (7) that comprises an actuator chamber (8), an actuator piston (9) displacably arranged in the latter and arranged to drive the valve (5), and a communication channel (11) through which a pressure fluid is conducted into the combustion chamber (8) for the driving of the actuator piston (9) and, thereby, the valve (5) in a direction in which the valve (5) is opened. The communication channel (11) extends from the combustion chamber (6) to the actuator chamber (8), and said pressure fluid comprises fluid pressurized by the pressure in the combustion chamber (6).

Abstract: A pressure pulse generator, including a pressure pulse transmitting body, a chamber, divided into a first and a second part, a first conduit that leads between a high pressure source and the first part of the chamber, a second conduit that leads between a low pressure source and the second part of the chamber, the body being displaceably arranged in the second part of the chamber and being in contact with a pressure fluid in the chamber, and with the environment and being spring loaded in a direction towards the chamber. The pressure pulse generator includes elements for opening/interrupting the communication between the first part of the chamber and the high pressure source, and elements for opening/interrupting the communication between the second part of the chamber and the low pressure source, and an operable valve body for opening/interrupting the communication between the first and second parts of the chamber.

Abstract: A pressure pulse generator includes a pressure pulse transmitting body displaceably arranged in a chamber divided by the body into a first and a second part, a first spring and a second spring, arranged to displace the body in a first direction and a second direction respectively in the chamber, a first conduit leading between a high pressure source and a first part of the chamber, wherein the pressure fluid in the first part acts on the body for displacing the latter in the second direction, and elements for opening/interrupting a communication between the first part and the high pressure source through the first conduit. The opening/interrupting elements interrupt communication while the body is displaced in the first direction from a predetermined starting position through a triggering of the first spring, and maintain communication while the body is displaced in the second displacement direction back to the starting position, whereby a biasing of the first spring is accomplished.

Abstract: A control method for the modulation of the torque of piston combustion engine that has a compression chamber (6) of variable volume and operable inlet valves (3). The torque requested for a predetermined operative condition is obtained through a selection of the volume of the compression chamber (6) combined with a selection of the time of opening and the time of closure of the inlet valves (3) combined with a selection of the frequency with which power strokes are performed.

Abstract: A device for the pneumatic operation of a tool includes a generally closed pressure fluid circuit (2), at least one compressor (5), for increasing the pressure of the pressure fluid in the circuit, the compressor (5) having an inlet and an outlet, and a tool driven by the pressure fluid in the circuit, and through which the pressure fluid is transported in the circuit from the outlet to the inlet of the compressor (5). The pressure that is generated by the compressor and the load adopted by the tool (8) are adapted such that the pressure of the returning pressure fluid downstream the tool (8) is higher than the pressure of the surrounding atmosphere.

Abstract: A pressure pulse generator includes a pressure pulse transmitting body displaceably arranged in a chamber divided by the body into a first and a second part, a first spring and a second spring, arranged to displace the body in a first direction and a second direction respectively in the chamber, a first conduit leading between a high pressure source and a first part of the chamber, wherein the pressure fluid in the first part acts on the body for displacing the latter in the second direction, and elements for opening/interrupting a communication between the first part and the high pressure source through the first conduit. The opening/interrupting elements interrupt communication while the body is displaced in the first direction from a predetermined starting position through a triggering of the first spring, and maintain communication while the body is displaced in the second displacement direction back to the starting position, whereby a biasing of the first spring is accomplished.

Abstract: A device for generating pressure pulses, includes a pressure fluid source and a pressure fluid depression, a pressure fluid circuit, a valve body displaceably located in a chamber, a first branch and a second branch the branches leaving to opposite sides of the valve body, the chamber having an opening on one side of the valve body, the opening communicating with the first branch and permitting pressure fluid to flow out of the chamber. The valve body, under the action of the pressure fluid in the branches, is displaceable to a first position in which it closes the opening and to a second position in which it leaves the opening open for out-flow of the pressure fluid. The device includes a first valve member arranged to permit or interrupt communication between the chamber and the pressure fluid source through the second branch upstream of the chamber.

Abstract: A device for the generation of pressure pulses, includes a cylinder (3), a piston that is displaceably arranged in the cylinder (3), a pressure fluid circuit with an inlet (6) into and an outlet (7) out of the cylinder (3) on one side of the piston (4), a shaft (18) connected to the piston (4), and a liquid-filled chamber (17). The shaft (18) is arranged to be displaced through said chamber (17) in connection to a displacement of the piston (4) in the cylinder (3). The device includes at least one valve member (22, 24, 29, 32) for an occasional interruption of a flow of liquid out of the chamber (17).

Abstract: A control method for the modulation of the torque of piston combustion engine that has a compression chamber (6) of variable volume and operable inlet valves (3). The torque requested for a predetermined operative condition is obtained through a selection of the volume of the compression chamber (6) combined with a selection of the time of opening and the time of closure of the inlet valves (3) combined with a selection of the frequency with which power strokes are performed.

Abstract: A control method for modulating the torque in an internal combustion engine with mechanical power transmission and with pneumatically, hydraulically or electromagnetically controllable valves that are open and closed based on signals from a control system, by which method a torque that is requested in an operative situation at a certain moment is provided by a selection of the frequency with which power strokes are performed by controlling the number of power strokes in relation to the number of idle strokes. The power strokes take part in 2-stroke cycles or 4-stroke cycles, and one or more 2-stroke cycles are alternated with or more 4-stroke cycles.

Abstract: A method for controlling an internal combustion engine, and an internal combustion engine, having at least one cylinder (1), a reciprocating piston (16) arranged in the cylinder (1), a combustion chamber (15) delimited by the cylinder (1) and the piston (16), and inlet and outlet valves (2, 3) that are controlled by a computer-based control system (5). The combustion engine includes elements (10) for injecting water or water steam into the combustion chamber (15), and the control system (5) is arranged to control the inlet and outlet valves (2, 3) and the elements (10) for injection of water or water steam such that power strokes that are mainly based on expanding combustion gases are alternated with power strokes that are mainly based on expanding water steam.

Abstract: A pressure pulse generator comprising a circuit (12) filled with a pressure fluid, and at least one communication channel (15) that is connected to the circuit and via which the pressure fluid can flow into and out of the circuit. The pressure pulse generator comprises a first pair (8, 9) and a second pair (10, 11) of electrically controlled valves that are connected in series, and the first pair of valves (8,9) is arranged in said circuit (12) upstream the at least one communication channel (15), and the second pair of valves (10, 11) is arranged in said circuit (12) downstream the at least one communication channel (15).