97results about "Free piston engines" patented technology

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event. A polarity indicative of an electromotive force in determined in at least one phase of the linear multiphase electromagnetic machine caused by a motion of the translator. In response to detecting the fault event, the system causes, based on the polarity, a current to be applied to a respective phase of the at least one phase to cause a force acting on the translator that opposes an axial motion of the translator to cause the translator to brake. Braking includes causing the translator to reciprocate at a reduced velocity by opposing axial motion over one or more cycles. The system may use one or more of position information, current information, operating parameters, to brake, or may brake the translator independent of such information.

A linear electric machine includes a shaft, a primary piston assembly operably coupled with the shaft, a stator assembly supporting the shaft and housing a load device, and a bearing assembly supporting an end of the shaft. The bearing assembly includes a bearing housing and a fluid bearing within the bearing housing. The bearing housing includes an opening for receiving the shaft therethrough. The linear electric machine also includes a secondary piston assembly formed integrally with the shaft and at least a portion of the bearing assembly for providing fluid to the bearing assembly.

The present invention refers to a linear electric generator, comprising: at least one intake port; at least one expansion chamber, and at least one expansion piston; at least one central cylinder; at least two reduced cylinders, wherein the diameter of said reduced cylinders is smaller than the diameter of the central cylinder, and wherein each reduced cylinder comprises a partition; at least one electric power-generating set of pistons, wherein each piston of said set of pistons is located inside the central cylinder and is suitable to linearly move inside the inner void of a reduced cylinders through the partitions of the reduced cylinders, and wherein each said piston is connected to an oscillator; at least one fluid chamber suitable to comprise incompressible fluid, wherein said fluid chamber is the void between the edge of the expansion piston closer to the electric power-generating pistons and the electric power-generating pistons themselves; at least two sets of magnets, wherein each set of magnets is attached to an oscillator; at least two end sections that comprise coil windings; and at least one outlet port, suitable to allow the evacuation of fluids from said expansion chamber. The invention also refers to a method for energy transformation.

The invention relates to an internal combustion engine having a shaft (41) on which a drive element (400) is provided, a first cylinder (9) with a first drive piston (3) movably mounted therein, and a second cylinder (10) with a second drive piston (4) movably mounted therein, wherein the first drive piston (3) is fluidically coupled to a first working piston (43) in a first working cylinder (35), the second drive piston (4) is fluidically coupled to a second working piston (29) in a second working cylinder (33), and the first and second working piston (43, 29) move back and forth in opposite directions in the first and second working cylinder (25, 33) and are operatively connected to the drive element (400). The invention also relates to a method for operating the internal combustion engine, to a use of the internal combustion engine for driving a motor vehicle, aircraft or ship, and to a motor vehicle, aircraft or ship which contains the internal combustion engine.

To provide the suitable control of a piston trajectory in a free piston combustion engine.SOLUTION: In a variety of embodiments in this disclosure, a free piston combustion engine is set as an object. As explained in this specification, a free piston assembly is displaced by a method and a system, a position / force trajectory is repeatedly determined over a propagation path, and desired engine performance can be achieved by displacing the free piston assembly on the basis of the position / force trajectory at least partially. In the double-piston assembly free piston engine, two piston assemblies are synchronized with each other.SELECTED DRAWING: Figure 8

The utility model discloses a four-stroke free piston engine, which comprises two groups of cylinders, two rocking gears, a one-way clutch and a transmission shaft, pistons of the two air cylinders in the same group are connected through push rods, racks are arranged on the two push rods respectively, one swing gear is meshed with the racks of the two push rods respectively, the other swing gear is meshed with the rack of at least one push rod, and the swing gears are in transmission connection with the corresponding transmission shafts through one-way clutches. Each air cylinder sequentially completes an air inlet stroke, a compression stroke, a power stroke and an exhaust stroke to form a cycle, a piston of one air cylinder always works and synchronously drives the other three air cylinders to complete the air inlet stroke, the compression stroke and the exhaust stroke respectively, and the locking directions of the two one-way clutches are opposite. Therefore, it is guaranteed that one of the two transmission shafts outputs torque, the other transmission shaft idles, and the idling direction of the transmission shafts is the same as the transmission rotation direction.

The present invention relates to an engine for improving the compression ratio and an engine cylinder block thereof, which comprises a cylinder block and a hydraulic cylinder block. The hydraulic cylinder block is located at the lower end of the cylinder block, and the head end of the hydraulic cylinder block is connected to the lower end of the cylinder block, so that the inner cavity of the hydraulic cylinder block is communicated with the inner cavity of the cylinder block. A hydraulic piston is arranged in the hydraulic cylinder block, and the hydraulic piston is in sliding fit with the inner wall of the hydraulic cylinder block. The hydraulic cylinder block is filled with liquid, and the liquid is pushed into the cylinder by the hydraulic piston to form a liquid column for compressing the gas. An isolation piston is arranged in the cylinder block, and the isolation piston is in sliding fit with the inner wall of the cylinder block. A spring is connected between the isolation piston and the hydraulic piston, and a heat absorber is installed below the isolation piston. In the present invention, an isolation piston is arranged in the cylinder to divide the compression process into two stages, namely near-isothermal compression a1 and adiabatic compression a2, so that the compression work is greatly reduced, the temperature at the end of compression is controlled, and the pressure at the end of compression decreases, providing a certain space for improving the compression ratio.

The utility model relates to a marine free piston internal combustion engine propulsion power device. Two cylinder units are respectively provided with a combustion chamber and a hydraulic piston; the U-shaped hydraulic pipe is filled with hydraulic oil and is connected with the hydraulic pistons of the two air cylinder units to transmit power. The hydraulic piston is arranged in the propelling hydraulic cylinder body, the propelling hydraulic cylinder body is linked with the hydraulic piston, and water absorption and drainage are achieved through the water inlet pipe and the high-pressure injection pipe; a water inlet valve in the control valve system is connected with a propelling hydraulic cylinder body and used for controlling low-pressure water suction of the propelling hydraulic cylinder body, and the propelling hydraulic cylinder body is connected with a high-pressure spraying pipe through a front high-pressure water spraying water outlet valve and a rear high-pressure water spraying water outlet valve and used for selecting the water spraying direction to achieve advancing or retreating of the ship. The supercharger is connected with the scavenging box. The reciprocating type internal combustion engine is innovated on the basis of a traditional reciprocating type internal combustion engine, the traditional working mode that a propeller is driven through crankshaft transmission is abandoned, and a ship propelling power device is completed in a reciprocating type free piston water spraying propelling mode.

The invention discloses a four-stroke free piston engine which comprises two sets of air cylinders, two swing gears, a one-way clutch and a transmission shaft, and each set of air cylinders comprises two opposite air cylinders. Pistons of the two air cylinders in the same group are connected through push rods, racks are arranged on the two push rods respectively, one swing gear is meshed with the racks of the two push rods respectively, the other swing gear is meshed with the rack of at least one push rod, and the swing gears are in transmission connection with the corresponding transmission shafts through one-way clutches. Each air cylinder sequentially completes an air inlet stroke, a compression stroke, a power stroke and an exhaust stroke to form a cycle, a piston of one air cylinder always works and synchronously drives the other three air cylinders to complete the air inlet stroke, the compression stroke and the exhaust stroke respectively, and the locking directions of the two one-way clutches are opposite. Therefore, it is guaranteed that one of the two transmission shafts outputs torque, the other transmission shaft idles, and the idling direction of the transmission shafts is the same as the transmission rotation direction.

To provide an excellent integrated linear generator system.SOLUTION: An integrated linear generator system includes, for example, a generator assembly, a control system, a frame system, an exhaust system, an intake system, a cooling system, a bearing system, one or more auxiliary systems, or a combination thereof. The generator system is configured to generate power, as controlled by the control system. The generator assembly may include an opposed- and free-piston linear generator configured to operate on a two-stroke cycle. The intake and exhaust systems are configured to provide reactants for and remove products from the generator assembly, respectively. The cooling system is configured to effect heat transfer, material temperature, or both, of components of the integrated linear generator system.SELECTED DRAWING: Figure 55

The present application relates to a hydraulic transmission system for use with free-piston engines coupled to hydraulic pumps, wherein multiple such engines are coupled to a single power transmission and output system. The system according to the present application aims to overcome the limitation of using a single free-piston engine, especially considering that in the prior art, this type of engine is used in isolation and that the power of the system, in these cases, is a function of the power of the free-piston engine itself, which makes it unsuitable for applications in which greater or variable power is required, whereas the system according to the present application can be used to power complex systems, such as isolated electrical power systems, mining, construction and road construction machinery, large agricultural machinery, forklift trucks, hydraulic booms and the like.

To provide a highly efficient linear combustion engine. [Solution] Various embodiments of the present invention are directed to a linear combustion engine comprising: a cylinder (105) having a cylinder wall and a pair of ends, the cylinder (105 including a combustion section (130) disposed in a central portion of the cylinder (105); a pair of opposed piston assemblies (120) adapted to move linearly within the cylinder (105), each piston assembly (120) disposed on one side of the combustion section (130) opposite the other piston assembly (120), each piston assembly (120) including a spring rod and a piston (125) having a solid front section adjacent to the combustion section (130) and a gas section; and a pair of linear electromagnetic machines (200).

Various embodiments of the present disclosure are directed towards free-piston combustion engines. As described herein, a driver section may be provided in a free-piston combustion engine for storing energy during an expansion stroke. The driver section may be configured to store sufficient energy to perform the subsequent stroke. In some embodiments, the driver section may be configured to store sufficient energy so as to enable the engine to operate continuously across engine cycles without electrical energy input. A linear electromagnetic machine may be provided in a free-piston combustion engine for converting the kinetic energy of a piston assembly into electrical energy.

The invention belongs to the field of engine engineering, and particularly relates to a star-shaped structure layout for an internal combustion engine and / or an air compressor, the layout does not need a crankshaft and a connecting rod, has one or more structures surrounding a piston, and can use any type of fuel (including liquid or gaseous fuel, such as hydrogen). In this way, no emissions (for hydrogen) are achieved, and high thermodynamic efficiency is obtained with any fuel. The invention relates to an internal combustion engine and / or an air compressor having an arrangement that can convert a linear movement into a rotational movement by means of a ring structure and a connecting structure connected to an eccentric shaft; the connecting structure connects the pistons and the ring, if at least three pistons are used, the ring can be polygonal, and if one or two structures surrounding the pistons are used, a welding mode can be adopted.

Pistons, and assemblies thereof, are provided herein with piston faces and lands including different features and geometries. The piston faces described herewith have a central portion (110) and a plurality of retainers (114). Each retainer of the plurality of retainers (114) extends radially outward relative to the central portion (110). At least one pair of adjacent retainers of the plurality of retainers (114) are disconnected at respective radially outward ends (116) of the at least one pair of adjacent retainers (114).

The present invention relates to an internal combustion engine comprising: a first cylinder for fuel combustion with a first drive piston movably arranged therein; a second cylinder for fuel combustion with a second drive piston movably arranged therein; and a shaft, wherein: the internal combustion engine is arranged such that the drive pistons in the two cylinders move back and forth in opposite directions; the first drive piston is mechanically coupled to a first pressure piston; the second drive piston is mechanically coupled to a second pressure piston; and wherein the internal combustion engine is characterized in that: the drive pistons are coupled to each other such that a forward stroke movement of the first drive piston in the first cylinder causes a return stroke movement of the second drive piston in the second cylinder; and it further comprises a first hydraulic unit in which the first pressure piston is movably arranged.and comprising a first impeller arranged in the first hydraulic unit and, separately, a second hydraulic unit in which the second pressure piston is movably arranged, as well as a second impeller arranged in the second hydraulic unit, - wherein the internal combustion engine is further arranged such that the first and the second drive pistons are coupled to each other in such a way that a forward stroke movement of the first drive piston in the first cylinder causes a return stroke movement of the first pressure piston in the first hydraulic unit, and a return stroke movement of the second drive piston in the second cylinder causes a forward stroke movement of the second pressure piston in the second hydraulic unit, so that the two pressure pistons move in opposite directions in their respective hydraulic units - wherein the hydraulic fluid located in the respective hydraulic unit, preferably a liquid,is set in motion by the movement of the pressure pistons and the moving hydraulic fluid causes a rotary back-and-forth movement of the axis of the impeller located in the respective hydraulic unit, - and the rotary back-and-forth movement of the impeller axes is transmitted by means of a transmission device into a continuous rotational movement of the shaft, as well as a method for operating this internal combustion engine, the use of this internal combustion engine for powering a motor vehicle, aircraft or ship and a motor vehicle, aircraft or ship that includes this internal combustion engine.

The present invention relates to an internal combustion engine, comprising a shaft (41) on which a drive element (400) is arranged, a first cylinder (9) with a first drive piston (3) movably arranged therein, and a second cylinder (10) with a second drive piston (4) movably arranged therein, wherein the first drive piston (3) is fluidically coupled to a first working piston (43) in a first working cylinder (35), the second drive piston (4) is fluidically coupled to a second working piston (29) in a second working cylinder (33), and the first and second working pistons (43, 29) move back and forth in opposite directions in the first and second working cylinders (25, 33) and are operatively connected to the drive element (400).The invention also relates to a method for operating the internal combustion engine, a use of the internal combustion engine for driving a motor vehicle, aircraft or ship, and a motor vehicle, aircraft or ship containing the internal combustion engine.

The present invention belongs to the field of engine engineering, and more specifically refers to a structural arrangement for an internal combustion engine and / or radial air compressor that does not have a crankshaft and connecting rods, but has one or more enclosed pistons. The engine can use any fuel, liquid or gaseous, including hydrogen (with the aim of using hydrogen to eliminate exhaust gases), and can achieve high thermodynamic efficiency with any fuel. The present invention relates to an internal combustion engine and / or air compressor having an arrangement in which linear motion can be transferred to circular motion by a ring with an eccentric and a connecting structure. The structure connects the piston to the ring, and can be polygonal if at least three pistons are used, or welded if one or two pistons are used.

A linear electromechanical system comprising: a stator comprising at least a first stator electronic circuit and a second stator electronic circuit or circuit set; a free piston mover movable in a reciprocating manner relative to the stator. The free piston comprising: a piston surface; a transducer configured such that an electromagnetic force is applicable on the free piston mover by one or more of the stator electronic circuits or one or more of the circuit set; and one or more transducer electronic circuits. The system further comprising a switching device for each of the first stator electronic circuit and the second stator electronic circuit or each of the circuit set, such that the current in each of the first stator electronic circuit and the second stator electronic circuit or each of the circuit set is independently controllable, and wherein at least one of the transducer electronic circuits is configured to receive power from at least one of the independently controllable stator electronic circuits or at least one of the circuit set during at least part of a stroke of the free piston mover.

A generator includes one or more combustion units. The generator also includes one or more ring housings coupled between the one or more combustion units. The one or more combustion units and the one or more ring housing form a circular pathway. The generator also includes one or more rotary pistons comprising one or more magnetic devices. The one or more rotary pistons are positioned to travel around the circular pathway when driven by a force generated by combustion in the one or more combustion units. The generator includes one or more coils positioned along the circular pathway. A current is induced in the one or more coils when the one or more magnetic devices pass through the one or more coils.

The Hydro-Mechanical Dual Engine is an aggregate engine where the piston movement is generated using either the internal combustion process, or electric power. The transmission of energy and the conversion of the straight piston movement into the rotational motion of the engine two main shafts are accomplished through a hydraulic-mechanical system. The movement of the pistons and sliding lids is accomplished thanks to the mechanical coupling system. The latter is designed to ensure the proper synchronization and positioning of lids and pistons and maximizes oil efficiency. The engine has the ability to fully function as an electric motor. The mechanical linkage system is not mechanically coupled to the engine shafts, allowing the latter to rotate freely and independently of the pistons and receive accumulating rotational speeds.

An integrated linear generator system includes, for example, a generator assembly, a control system, a frame system, an exhaust system, an intake system, a cooling system, a bearing system, one or more auxiliary systems, or a combination thereof. The generator system is configured to generate power, as controlled by the control system. The generator assembly may include an opposed- and free-piston linear generator, configured to operate on a two-stroke cycle. The intake and exhaust systems are configured to provide reactants to and remove products from the generator assembly, respectively. The cooling system is configured to effect heat transfer, material temperature, or both, of components of the integrated linear generator system. The bearing system is configured to constrain the off-axis motion of translators of the generator assembly without applying significant friction forces. The frame system is configured to manage rigidity, flexibility, and alignment of components of the integrated linear generator system.

The invention discloses a two-stroke free piston linear generator and a working method. The two-stroke free piston linear generator comprises a cylinder body and a free piston linear power generation structure. Free piston linear power generation structures are symmetrically arranged on the left side and the right side of the cylinder body. The free piston linear power generation structure comprises a free piston starting mechanism and a magnetic resistance type power generation mechanism; the cylinder body is used for temporarily storing combustible mixed gas and providing a closed working space, the combustible mixed gas is combusted to do work to provide power for the free piston starting mechanism, the free piston starting mechanism does linear reciprocating motion in a two-stroke mode, and then the magnetic resistance type power generation mechanism converts linear motion mechanical energy into electric energy. The symmetrical free piston starting mechanisms are adopted, the problems that an existing free piston linear generator is poor in vibration characteristic and combustion cycles influence one another are solved, the magnetic resistance type power generation mechanism is adopted, the problem that a permanent magnet loses efficacy at the high temperature is avoided, premixed gas serves as a gas spring to increase the compression ratio of the mixed gas, and the energy efficiency is improved. The combustion efficiency is improved.

To provide optimal control of the piston trajectory in a free-piston combustion engine. [Solution] Various embodiments of this disclosure relate to free-piston combustion engines. As described herein, methods and systems are provided to achieve desired engine performance by displacing a free-piston assembly, repeatedly determining the position-force trajectory over the propagation path, and causing the displacement of the free-piston assembly based at least partially on the position-force trajectory. In a dual-piston assembly free-piston engine, synchronization of two piston assemblies is provided.

Systems and methods are provided for controlling two or more linear generators each operating according to a repeated behavior to constitute a cycle. A control system utilizes control circuitry to determine a desired phase offset between operation cycles of a first linear generator and a second linear generator of the two or more linear generators. During operation, an actual phase offset between the first linear generator and the second linear generator is determined. The control circuitry of the control system is used to modify the operation of at least one of the first linear generator or the second linear generator to achieve the desired phase effect.

The present invention relates to a supercharging method for a free-piston internal combustion generator. By constructing a simulation model of the free-piston internal combustion generator and changing the intake and exhaust pressure values according to different supercharging methods, relationship data one between the intake pressure, exhaust back pressure and the performance parameters of the free-piston internal combustion generator is obtained to determine a matching supercharger. Then, by changing the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe, relationship data two between the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe and the performance parameters of the free-piston internal combustion generator is obtained; the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe of the free-piston internal combustion generator are adjusted. Finally, the adjusted free-piston internal combustion generator is supercharged by using the matching supercharger. Through the supercharging method of the present invention, precise matching between the free-piston internal combustion generator and the supercharger can be achieved.

The invention discloses a free piston type internal combustion power generation system motion control method and device based on a track, equipment and a medium, and relates to the field of free piston type internal combustion power generation systems.The method comprises the steps that the operation state of a free piston type internal combustion power generation system is determined according to operation parameters of the free piston type internal combustion power generation system; determining reference trajectories of the free piston type internal combustion power generation system in different operation states; a double-loop motion control structure is adopted to track the reference track, and a reference voltage vector is determined; and the reference voltage vector is modulated into a duty ratio signal through a space vector pulse width modulation algorithm, and the free piston type internal combustion power generation system is controlled to move. According to the invention, the track of the piston can be controlled, and the stability of the FPLG system is improved.

Various embodiments of the present disclosure provide a combustion-powered fastener-driving tool including multiple combustion chambers and / or usable with fuel canisters of varying lengths.