2877results about "Non-mechanical valve" patented technology

An intake electromagnetic driving valve and an exhaust electromagnetic driving valve are provided which use electromagnetic force to drive an intake valve and an exhaust valve, respectively. In step 102, the ratio between the number of combustion execution cycles and the number of combustion halts is set to obtain a desired target output value. Output control patterns that each consist of combustion execution timing equivalent to the required number of combustion execution cycles, and combustion halt timing equivalent to the required number of combustion halts are set in step 106, 114. In steps 108 to 112, or 118 to 122, in accordance with the output control patterns, whether combustion is to be executed is set with respect to the explosion timing that arrives in each cylinder in order.

The invention describes devices for performing thermodynamic work on a fluid, such as pumps, compressors and fans. The thermodynamic work may be used to provide a driving force for moving the fluid. Work performed on the fluid may be transmitted to other devices, such as a piston in a hydraulic actuation device. The devices may include one or more electroactive polymer transducers with an electroactive polymer that deflects in response to an application of an electric field. The electroactive polymer may be in contact with a fluid where the deflection of the electroactive polymer may be used to perform thermodynamic work on the fluid. The devices may be designed to efficiently operate at a plurality of operating conditions, such as operating conditions that produce an acoustic signal above or below the human hearing range. The devices may be used in thermal control systems, such as refrigeration system, cooling systems and heating systems.

An internal combustion engine is provided. Facing pistons eliminate a cylinder head, thereby reducing heat losses through a cylinder head. Facing pistons also halve the stroke that would be required for one piston to provide the same compression ratio, and the engine can thus be run at higher revolutions per minute and produce more power. An internal sleeve valve is provided for space and other considerations. A combustion chamber size-varying mechanism allows for adjustment of the minimum size of an internal volume to increase efficiency at partial-power operation. Variable intake valve operation is used to control engine power.

A control system for an engine comprises an operation range judging section that judges an operation range assumed by the engine, a variable cycle operating section that switches the operation of the engine between 4-cycle operation and a different cycle operation in accordance with a judgment made by the operation range judging section, the different cycle operation being of an operation whose cycle is different from 4-cycle, and an intermediate variable cycle operating section that allows part of the cylinders to carry out 4-cycle operation and remaining part of the cylinders to carry out the different cycle operation when the operation range judging section judges that the engine is under an intermediate operation range assumed between an operation range provided by 4-cycle operation and an operation range provided by the different cycle operation.

An exhaust valve arrangement for use in a combustion chamber of a compression ignition internal combustion engine, includes a piston which is movable outwardly from the combustion chamber in response to pressure generated within the combustion chamber as a result of combustion, and an outer sleeve within which the piston is movable. The outer sleeve is an exhaust valve which is actuable between open and closed positions to open and close, respectively, an exhaust passage from the combustion chamber. The exhaust valve arrangement further includes a pump chamber for receiving fluid, and a pumping plunger coupled to the piston and movable with the piston so as to pressurise fluid (e.g. fuel) within the pump chamber as the piston is urged outwardly from the combustion chamber. The pressure within the pump chamber is proportional to cylinder pressure and is sensed by a sensor which provides an output signal to an Engine Control Unit (ECU 16). An accumulator volume receives fluid that is pressurised within the pump chamber. Where the fluid is fuel, the accumulator volume is arranged to deliver fuel to one or more injectors of a common rail fuel injection system. Alternatively the accumulator volume may be arranged to deliver pressurised fluid to one or more engine systems e.g. for actuation purposes.

A turbine (2) driven electric power production system (1),—said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time,—said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7),—said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (fg) near a given desired frequency (fdes), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising—a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and—a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (ω) of said turbine (2), —a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), —a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsrset) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).