44results about "Free piston engines" patented technology

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 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.

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.

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.

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 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.

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.

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.

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.

A free-piston engine, comprising at least one cylinder bank, which comprises two cylinders arranged opposite each other, and further comprising a transmission unit, wherein the transmission unit comprises two oscillating gears, and one-way clutches and transmission shafts that respectively match the oscillating gears; the oscillating gears are set in fixed-axis rotation; pistons of the two cylinders in the cylinder bank are connected by means of a push rod (3); the push rod (3) is provided with a rack (31); the oscillating gears mesh with the racks (31); and by means of the one-way clutches, the oscillating gears are in transmission connection with the transmission shafts corresponding thereto. The free-piston engine can eliminate a complex transmission mechanism composed of connecting rods, crankshafts, etc., and converts a linear reciprocating motion of the pistons into a rotational motion for output, thereby improving engine efficiency.

Linear generator systems are presented herein for interfacing a number of different linear electromagnetic machines (LEMs) for generating collective power outputs. A plurality of LEMs is coaxially arranged in sequence along a longitudinal axis. Each LEM comprises a respective translator, and a respective stator. A pair of gas springs are each respectively arranged outboard of a pair of outboard LEMs in contact with the respective translators of the outboard LEMs. A plurality of reaction sections is arranged between adjacent LEMs of the plurality of LEMs. Each of the plurality of reaction sections is in contact with respective translators of the respective adjacent LEMs.

The present invention relates to an internal combustion engine comprising a first cylinder (6) with a first piston (1) movably arranged therein, and a second cylinder (37) with a second piston (33) movably arranged therein. The first and second cylinders (6, 37) each contain a first chamber (5, 39) and a second chamber (7, 36), wherein the first chamber (5, 39) is arranged on one side of the first / second piston (1, 33) and is configured as a combustion chamber (5, 39), and the second chamber (7, 36) is arranged on an opposite side of the first / second piston (1, 33) and contains a fluid, in particular a hydraulic fluid. The first piston (1) and the second piston (33) are fluidically coupled and move back and forth in opposite directions within the first and second cylinders (6, 37).Furthermore, the internal combustion engine has a turbine (23) with a rotor (23) connected to a shaft (18), the turbine (23) being fluidically connected to the second chamber (7, 36) of the first and second cylinders (6, 37). The internal combustion engine is configured to induce a rotation of the rotor (22) of the turbine (23) and a return stroke of the second piston (33) by a forward stroke of the first piston (1), and vice versa, to induce a rotation of the rotor (22) of the turbine and a return stroke of the first piston (1) by a forward stroke of the second piston (33).

The application discloses a linear internal combustion power generation system combustion heat release analysis method and system, and belongs to the technical field of linear internal combustion power generation systems. The method comprises the following steps: obtaining basic design and operation information of a linear internal combustion power generation system; obtaining key signals for combustion heat release analysis of the linear internal combustion power generation system under a given working condition, and pre-processing the key signals; calculating the combustion heat release rate, fuel consumption and heat release in a cycle of the linear internal combustion power generation system in a combustion heat release process; performing characteristic analysis on the combustion cycle of the linear internal combustion power generation system until the characteristic analysis is completed on all cycles; and counting combustion performance, stability and economic evaluation indexes of the linear internal combustion power generation system under the given working condition. The method provided by the application can obtain accurate and effective system combustion analysis results, and is helpful to the practical development of the linear internal combustion power generation system.

The application provides a kind of multi-module free piston engine group admission timing control method and system, it is related to internal combustion engine admission control technical field, method includes: with the time that piston reaches reference displacement as cycle timing reference;Based on cycle timing reference, the opening time and closing time of each admission splitter valve are calculated;Based on opening time and closing time, the mathematical model of the coupling aerodynamic system of common admission cavity-scavenging tank is established;According to the mathematical model of coupling aerodynamic system, a multi-objective optimization function is constructed;Set constraint condition;Under the constraint condition, according to the multi-objective optimization function, the optimal admission timing parameters and the optimal performance index value are solved by double-layer optimization algorithm;According to the optimal admission timing parameters and the optimal performance index value, the admission timing of engine group is controlled.The application can ensure that multi-module engine runs stably and efficiently in limited space.

A linear electromagnetic machine includes a stator, a translator, and a bearing system. The bearing system maintains alignment against lateral displacement of the translator relative to the stator, as the translator reciprocates axially. More particularly, the bearing system maintains a motor air gap between the stator and a magnetic section of the translator. The stator includes a plurality of stator teeth and windings, which form a plurality of phases. The stator teeth and windings are arranged using a hoop stack with spines to form a stator bore and define the motor air gap. The bearing system can include bearing housings that are configured to form a bearing interface with a surface of the translator. The bearing interface can include a contact bearing or a non-contact bearing, such as a gas bearing. Current is controlled in the phases to convert between electrical energy and kinetic energy of the translator.

A free-piston engine, comprising at least one cylinder group, wherein each cylinder group comprises two cylinders arranged opposite each other; pistons of the two cylinders in each group are connected to each other by means of a push rod (3); and each push rod (3) is provided with a rack (31). The free-piston engine further comprises a transmission unit, which comprises a swing gear (4), a first one-way clutch (5a), a second one-way clutch (5b), a first power output member (6a) and a second power output member (6b), wherein the swing gear (4) is rotationally arranged about a fixed axis, the swing gear (4) meshes with the rack (31), the swing gear (4) is connected to the first power output member (6a) by means of the first one-way clutch (5a), and the swing gear (4) is connected to the second power output member (6b) by means of the second one-way clutch (5b). In the free-piston engine, a complex transmission mechanism composed of a push rod, a crankshaft and the like in the prior art is eliminated, and a reciprocating linear motion of a piston is converted into a rotary motion, so as to output power in a rotational form.

The present invention relates to a drive motor, 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 drive motor, a use of the drive motor for driving a motor vehicle, aircraft or ship and a motor vehicle, aircraft or ship containing the drive motor.

The invention discloses a variable compression ratio internal combustion constraint linear power generation system, and relates to the technical field of energy power, the variable compression ratio internal combustion constraint linear power generation system comprises a casing, a piston, a variable connecting rod, a generator set and a motor set, the piston is slidably arranged in the casing, the variable connecting rod comprises a first connecting rod and a second connecting rod, and the first connecting rod is in threaded connection with the second connecting rod; the first connecting rod is fixedly connected with the piston, the generator set comprises a first permanent magnet block and a first coil, the first coil is fixedly arranged in the machine shell, the first permanent magnet block is fixedly arranged outside the first connecting rod, the generator set comprises a second permanent magnet block, a second coil and a linear bearing, and the second connecting rod and an inner ring of the linear bearing form axial sliding and circumferential fixed connection. The second permanent magnet block is fixedly arranged outside the linear bearing, the second coil is fixedly arranged in the machine shell and connected with an external power supply line, and the end of the second connecting rod is coaxially and rotationally connected with a crank connecting rod of the engine. The device is simple in structure and low in cost, and the problem of lagging of relative working condition adjustment does not exist.

The application discloses a kind of based on hydrogen combustion and micro needle electrode ignition ultra-high energy density micro engine device and preparation method thereof, belong to micro electro mechanical system and micro energy technology field.The device mainly includes top cylinder shell, bottom cylinder shell, piston, top plug-in unit and bottom plug-in unit.It is in that a pair of opposite micro needle electrode in micro combustion chamber ignites pre-mixed hydrogen / oxygen, generates high-temperature high-pressure gas to push piston to carry out two-stroke reciprocating motion, to convert chemical energy directly into mechanical energy.The device adopts unique combustion chamber flow channel design, combined with the flow divider on piston, effectively optimizes scavenging process, reduces fuel short circuit, improves gas exchange efficiency.

The present technology relating to the use of magnetic forces is intended to be applied in internal combustion engines. The proposed utility model is for use in conventional internal combustion engines, by means of magnetic forces generated by permanent super magnets applied to internal parts of the combustion engine, regardless of the arrangement, positioning, or number of cylinders. These magnets are always applied to cylinders that have been rendered thermally inactive, but are all connected to the same crankshaft, so that the forces of attraction and repulsion contribute to the reciprocating motion of the propelling elements, originating from the thermally active cylinders, thereby increasing the overall efficiency of the machine. The installation of super permanent magnets on the cams of each intake and exhaust valve camshaft of the thermally inactive cylinders, and the placement of super magnets on the heads of the pistons of these cylinders, in such a way that the attractive and repulsive forces generated by the poles through the combination of opposite poles (north and south) to produce an attractive driving force, or of identical poles (north–north or south–south) to produce a repulsive driving force operate as a booster for the piston movement.

A linear electro-mechanical system comprising: a stator including at least first and second stator electronic circuits or groups of circuits; a free piston mover movable in a reciprocating motion relative to the stator, the free piston including: a piston surface; a translator configured so that an electromagnetic force may be applied on the free piston mover by one or more of the stator electronic circuits or groups of circuits; and one or more translator electronic circuits, the system further comprising a switching device for each of the first and second stator electronic circuits or groups of circuits such that the current in each of the first and second stator electronic circuits or groups of circuits is independently controllable, and wherein at least one of the translator electronic circuits is configured to receive power from at least one of the independently controlled stator electronic circuits or groups of circuits during at least part of the stroke of the free piston mover.

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 disclosure relates to a free piston linear engine (1), said engine (1 ) extending in an axial direction from a first end (101 ) to a second end (102) and comprising: a housing (2) with a main cylinder (10), a hollow main piston (20), a hollow auxiliary cylinder (30) and an auxiliary piston (40) all extending in said axial direction, said main piston (20) and auxiliary piston (40) being arranged to move independently of each other along said axial direction and within said housing (2); a combustion chamber (50) formed between the main piston (20) and the main cylinder (30), said combustion chamber (50) comprising a fuel inlet (51 ) and a combustion chamber outlet (53); a working gas chamber (80) formed between said hollow main piston (20) and said hollow auxiliary cylinder (30), said working gas chamber (80) defining a variable volume which is arranged to vary by moving the main piston (20) relative to the auxiliary cylinder (30); a cooling arrangement (70) arranged in the working gas chamber (80); and a regenerative heat exchanger (60) located in the working gas chamber (80) and being configured for allowing exhaust gases from said combustion chamber (50) to be guided through the regenerative heat exchanger (60) and to be used as a heating media.

The invention discloses a free piston engine which comprises two oppositely-arranged air cylinders and further comprises two swing gears, one-way clutches and transmission shafts, the one-way clutches and the transmission shafts are matched with the swing gears respectively, pistons of the two air cylinders are connected through a push rod provided with a rack, and the swing gears are meshed with the rack. The swing gear is in transmission connection with the transmission shaft corresponding to the swing gear through one-way clutches to form fixed-axis rotation, one-time linear reciprocating of the piston forms a cycle, and the locking directions of the two one-way clutches are opposite to each other, so that it is guaranteed that the two transmission shafts alternately output torque and idle within two strokes of one reciprocating. The idling direction of the two transmission shafts is the same as the transmission rotation direction, a transmission mechanism composed of a crankshaft and the like is omitted, and linear reciprocating motion of the piston is converted into rotation motion so as to output power in a rotation form.

The invention provides an optimization method and system for a piston moving track of a linear internal combustion power generation system, and relates to the technical field of controllable circulating linear internal combustion power generation systems.The method comprises the steps that a state equation of a linear internal combustion power generation system to be optimized is established based on the first law of thermodynamics; the method comprises the following steps: dividing a half operation cycle trajectory of a piston into a plurality of operation stages according to an association relationship between a piston operation trajectory in a linear internal combustion power generation system to be optimized and a thermodynamic process in a cylinder; setting a solution boundary condition of each operation stage; combining a Pontryagin minimum principle and a variational method to construct a Hamiltonian function comprising a target function, a state equation and a co-state variable; combining a Hamiltonian function and a solving boundary condition, and determining a differential equation set; solving the differential equation set, and determining a local optimal track of each operation stage; and according to the symmetry of the piston moving trajectory, the local optimal trajectories are combined, and the optimal piston moving trajectory of the to-be-optimized linear internal combustion power generation system is generated.