220 results about "Scavenging" patented technology

An ammonia-rich combustion coupled dual-mode prechamber ammonia-fueled engine control system is provided, including an ammonia-fueled engine and an electronic control unit. The ammonia-fueled engine includes a combustion chamber, a dual-mode jet ignition device, and an ammonia injector. The dual-mode jet ignition device includes a prechamber, an air injector, and a fuel injector. When the engine operates, ammonia fuel is firstly injected into the combustion chamber by the ammonia injector to form a rich ammonia-air mixture with air in the combustion chamber. During a compression stroke of the engine, the rich ammonia-air mixture in the combustion chamber is entered into the prechamber through a jet hole. The air injector performs scavenging in the prechamber until a equivalence ratio of prechamber gas mixture is less than 1.0, and then the fuel injector injects fuel into the prechamber forming target mixture. Finally, the target mixture is ignited by the spark plug.

The invention relates to a tailing scavenging cylinder, which belongs to the technical field of mineral separation and comprises an upper cylinder body, an inverted cone and a lower cylinder body, the upper end of the inverted cone is fixedly connected with the upper cylinder; an overflow groove is formed in the periphery of the upper cylinder body; an accommodating space is formed in the upper cylinder body, the inverted cone and the lower cylinder body; a middling collector is arranged in the accommodating space; a middling concentration hopper is arranged on the periphery of the lower barrel; an overflow weir is arranged at the uppermost end of the upper cylinder body; the lowermost end of the lower barrel is connected with an inner barrel of the mineral processing equipment and is used for receiving coarse tailings generated by the inner barrel; coarse-particle intergrowth minerals in the coarse tailings and part of entrained fine-particle concentrates are settled and recycled through the middling collector, then enter the middling concentration hopper and are concentrated through the middling concentration hopper to become middlings to be discharged, and the rest qualified tailings cross the overflow weir, leave the tailings scavenging barrel, enter the overflow groove and are discharged. The method solves the contradiction that traditional ore dressing equipment is used for obtaining high-grade concentrate products and reducing the product recovery rate.

The invention discloses a multi-stage roots vacuum pump which comprises a main machine body, a vacuum pump, a vacuum pump and a vacuum pump, and a rotor is arranged in the main machine body; the scavenging plate is arranged on one side of the main machine body; the motor is arranged on the scavenging plate and is in transmission connection with the rotor; the gear box is arranged on the other side of the main machine body and is in transmission connection with the rotor; wherein an air inlet pipe and an air outlet pipe are arranged at the upper end of the main machine body, and the air inlet pipe is communicated with the air channel in the main machine body. According to the invention, through the design of the six-stage flow channel, the air exhaust speed is higher through six-stage compression, the vacuumizing efficiency is improved, meanwhile, the size of the whole machine can be reduced, and green operation is realized.

A gas turbine engine includes a fan, a combustor positioned in a core air flowpath that generates combustion gases, a steam system that extracts water from the combustion gases and generates steam, and a gearbox assembly. The steam system includes water storage devices that store the water therein. The water storage devices include a first state in which a level of the water increases or is maintained and a second state in which the level of the water decreases as the water flows through the water storage devices. The gearbox assembly includes a gearbox and a gutter for collecting a gearbox lubricant scavenge flow from the gearbox. The gutter is characterized by a lubricant extraction volume ratio between 0.01 and 0.3, inclusive of the endpoints. The lubricant extraction volume ratio defined by:VGVG⁢B·VGis a gutter volume of the gutter and VGB is a gearbox volume.

Scavenge systems for a gas turbine engine including a valve positioned at a first drainage outlet of an enclosure to selectively open and evacuate liquid from the cavity through the first drainage outlet in response to the valve being submerged in liquid are provided. Methods of reducing suction of air from an enclosure of a cavity of a gas turbine engine are further provided.

The invention provides an opposed piston two-stroke diesel engine vector air inlet-space injection combustion system which comprises an air cylinder sleeve, an air inlet piston, an exhaust piston and a plurality of oil injectors, and the air inlet piston, the exhaust piston and the inner wall of the air cylinder sleeve are matched to form a combustion chamber. A plurality of vector air inlets and exhaust ports are formed in the positions, close to the air inlet piston and the exhaust piston, of the air cylinder sleeve respectively, each vector air inlet is composed of a direct-flow air port and a vortex air port, and the direct-flow air ports and the vortex air ports are arranged at intervals in the circumferential direction; the number of the oil sprayers is two, and the two oil sprayers are arranged on the center face of the air cylinder sleeve in a staggered mode so that the oil sprayers can be arranged in a reverse vortex mode. The problems that an opposed piston two-stroke diesel engine is insufficient in combustion, low in scavenging efficiency and the like are solved, oil and gas in a cylinder can be rapidly and sufficiently mixed through the system, the combustion process is effectively accelerated, combustion in the cylinder is more sufficient, and the combustion efficiency is improved.

A method of lubricating a transmission system including: scavenging, via a lubrication tube of a lubrication system disposed within the transmission system, oil from at least one of a plurality of gears; directing the scavenged oil from the lubrication tube to a plurality of oil conduits extending from the lubrication tube; and translating a shift assembly in a longitudinal direction such that the shift assembly actuates a plurality of poppet valve assemblies disposed in the plurality of oil conduits between a closed position and an open position. The scavenged oil circumventing the plurality of poppet valve assemblies in the open position and the plurality of poppet valve assemblies form a seal with the plurality of oil conduits in the closed position.

The invention belongs to the technical field of piston engines, and particularly relates to a variable-volume crankcase which is integrated with a deformable and automatically-recoverable device, a variable-volume cavity is formed in the crankcase through a deformable or slidable diaphragm, and particularly, an elastic reset element is arranged in the upper surface of the device, so that the variable-volume cavity is formed in the crankcase. It is ensured that the diaphragm can stably and regularly move and reset after deforming or sliding; power for deformation or sliding of the diaphragm comes from periodical extrusion of an engine crank to the diaphragm, by correctly matching a volume change curve of the crankcase with an air distribution phase, the volume of the crankcase is enlarged during air inlet, so that negative pressure in the crankcase is increased, the volume of the crankcase is reduced during scavenging, pressure in the crankcase is increased, and the service life of the crankcase is prolonged. The technical problems of insufficient air intake, low scavenging efficiency, power attenuation and the like of a two-stroke piston engine under the low air pressure condition are solved, and a feasible solution is provided for power improvement of a small aero-engine and power recovery in a high-altitude environment.

The invention discloses a supercharging control method for improving scavenging control. The supercharging control method comprises the steps that whether the minimum supercharging closed-loop enabling pressure condition is met or not is determined according to the scavenging working condition state of an engine; when the minimum pressure condition of pressurization closed loop enabling is met, whether the pressurization closed loop is enabled or not is determined; and after the pressurization closed loop is enabled, pressurization closed loop control is carried out. According to the method, the minimum pressurization closed-loop enabling pressure condition is determined through the engine scavenging working condition, pressurization closed-loop control is conducted on the pressurization closed-loop enabling condition, when the scavenging working condition is activated, the pressurization closed-loop enabling condition is optimized in cooperation with scavenging work, and therefore the scavenging working performance is further assisted to be achieved.

An engine is provided with various enhanced features. For example, a 2-stroke diesel engine has a porting design that enhances the efficiency of a scavenging event. In specific embodiments, a four-piece piston is positioned in each cylinder of the engine. The four-piece piston includes a bowl, a ring retainer, a skirt, and a wrist-pin bearing. In various embodiments, fuel pumps are coupled to fuel channels or high-pressure lines to provide a constant and equal high-pressure fuel supply to engine cylinders. In more specific embodiments, the length of each of the high-pressure lines is the same. In certain specific embodiments, complimentary screws form a supercharger that further improves engine efficiency by providing high-pressure intake air to the porting process.

The invention relates to the technical field of hydrogen engines, in particular to a hydrogen internal combustion engine and a scavenging control method of the hydrogen internal combustion engine. The hydrogen internal combustion engine comprises an engine cylinder body assembly, a supercharger, an air filtering device, an air supplementing part, an air outlet part and a control device, the air supplementing part comprises a first air supplementing pipeline and at least two second air supplementing pipelines, and an air outlet of the air filtering device is communicated with the first air supplementing pipeline and an air inlet of the supercharger. One end of the first air supply pipeline is communicated with the air filtering device, the other end of the first air supply pipeline is communicated with the crankcase, the cylinder cover is communicated with an air outlet of the supercharger through at least one second air supply pipeline, the crankcase is communicated with the air outlet of the supercharger through at least one second air supply pipeline, and the air outlet part is communicated with the crankcase. The control device is electrically connected with the air supply part and the air outlet part. According to the hydrogen internal combustion engine, through the design of the multiple gas supplementing pipelines, the hydrogen concentration can be effectively reduced, and excessive hydrogen gathering is avoided.

In certain embodiments, a significant improvement in H2-ICE performance can be achieved by a combination of active scavenging pre-combustion chamber technology and predictive model-based spark control to overcome the drawbacks of known combustion technologies. In certain embodiments, advanced combustion modeling and simulation of the ignition process, including spark events, arc movement and elongation, and resulting flame propagation, can be used to predict the relationship between spark energy / output, flow within the electrode gap, and flame growth (SOC) for different engines, different spark plugs, and various conditions. This information can be used to adjust the spark energy / output characteristics during the spark event of the same cycle in order to minimize SOC variations and significantly reduce the tendency of combustion anomalies such as backfire, knocking, and pre-ignition that prevent the achievement of high engine output density and efficiency.

The utility model discloses a non-coaxial pre-combustion chamber structure, a pre-combustion chamber system and an engine, and relates to the technical field of engineering machinery. Comprising a first cavity and a second cavity which are formed in a cavity of the pre-combustion chamber and communicate with each other; the one-way valve is arranged opposite to one side of the first cavity and can be communicated with or disconnected from the first cavity, the sparking plug is parallel to the one-way valve and arranged opposite to the other side of the first cavity, and one end of the sparking plug can extend into the first cavity; the second cavity is distributed in the vertical direction, the first cavity is obliquely arranged above the second cavity, and the side, opposite to the spark plug, of the first cavity inclines upwards; combustible mixed gas moves towards the sparking plug, so that scavenging near the sparking plug, especially the root part, is realized, the scavenging effect of a pre-combustion chamber is improved, transient misfire is improved, and scavenging near the sparking plug is improved; and in the load step process, scavenging is sufficient, and the ignition stability is improved.

The invention discloses a method and related equipment for determining the air mass flow of an engine cylinder, and the method comprises the steps: introducing a target gas with a preset concentration into an air inlet of the engine cylinder, and determining the first air mass flow of the air inlet; parameter information of target gas on the gas inlet side and the gas outlet side of an engine cylinder is determined; determining the scavenging rate of the engine cylinder according to the parameter information, and determining the scavenging amount of the engine cylinder based on the scavenging rate; and determining a second air mass flow in the engine cylinder according to the scavenging amount and the first air mass flow.

A two-stroke internal combustion engine (100) is described as comprising: an engine body (150) defining an internal volume, at least one piston (135), which is slidably ac-commodated in a cylindrical portion (151) of said internal volume, to subdivide it into at least two chambers of variable volume, one of which is a pumping chamber (160) and one is a combustion chamber (155), a crankshaft (105), rotatably coupled to the engine body (150) and rotating about a predetermined rotation axis (R), which carries at least one crank (120) within the pumping chamber (160), a connecting rod (140) connected between said crank (120) and the piston (135), to transform a linear reciprocating movement of the piston (135) into a rotary movement of the crankshaft (105), and at least one transfer system for fluidically connecting said pumping chamber (160) with said combustion chamber (155); wherein said transfer system comprises: an inlet port (205) located on a plane internal surface (165) of the engine body (150), which plane internal surface (165) delimits the pumping chamber (160) and is orthogonal to the rota-tion axis (R) of the crankshaft (105), at least one outlet port (210) formed on an internal surface of the engine body (150) delimiting said cylindrical portion (151) of the internal volume, and at least one transfer duct (215) adapted to put the inlet port (205) in com-munication with the outlet port (210); wherein the inlet port (205) has an arcuate shape extending angularly about the rotation axis (R) of the crankshaft (105) with an angular extension (Ω) greater than or equal to 50 sexagesimal degrees, for example greater than or equal to 90 sexagesimal degrees.

The invention relates to the technical field of engines, in particular to an opposed piston actuating mechanism integrated with compressed air pistons, which comprises an air cylinder assembly, the air cylinder assembly comprises a main air cylinder, an auxiliary air cylinder and a compressed air cylinder, a main piston is arranged in the main air cylinder, an auxiliary piston is arranged in the auxiliary air cylinder, and the compressed air piston is arranged in the compressed air cylinder; the main piston is driven by a reciprocating action mechanism and reciprocates in the horizontal direction; the auxiliary piston is connected and matched with the air compression piston, and the air compression piston synchronously acts and performs air inlet and air compression while the auxiliary piston reciprocates in the horizontal direction. The opposed piston executing mechanism drives the main piston and the auxiliary piston in the air cylinder assembly to act synchronously and drives the air compression piston and the auxiliary piston to act synchronously, so that the air compression air cylinder can suck and compress air autonomously and is used for air scavenging of the air cylinder assembly, an external compressor for air scavenging is omitted, structure simplification is facilitated, and cost is reduced.

The present disclosure provides a single-flow large turbocharged two-stroke internal combustion engine (100) and a method of operating such an engine (100) configured to supply pressurized scavenge and / or exhaust gas to a pressurized gas consumer (200). The engine includes a plurality of cylinders, an intake system, an exhaust system, one or more turbochargers having a turbine, a fuel system, a bypass system for supplying bypassed pressurized gas to the pressurized gas consumer by taking a controlled amount of scavenge from the intake system to bypass the engine and / or by taking a controlled amount of pressurized exhaust from the exhaust system to bypass the turbine, and a controller configured to adjust the amount of bypassed pressurized gas supplied to the consumer in accordance with sensed scavenge pressure and / or exhaust temperature. The controller is configured to operate the engine in a manner that makes various adjustments to maximize scavenge pressure and / or to maximize scavenge bypass mass flow.

The utility model belongs to the technical field of engines, and discloses a pre-combustion chamber structure and an engine. The pre-combustion chamber structure comprises a pre-combustion chamber body, and the pre-combustion chamber body is provided with a pre-combustion chamber. The pre-combustion chamber body is further provided with an active scavenging channel communicating with the pre-combustion chamber and an active fuel gas channel communicating with the pre-combustion chamber. In the height direction of the pre-combustion chamber, the active fuel gas channel is located below the active scavenging channel. The pre-combustion chamber structure further comprises a control valve block, and the control valve block can selectively connect and disconnect the input end of the active scavenging channel and the scavenging gas source and can selectively connect and disconnect the input end of the active fuel gas channel and the fuel gas source. The starting time for scavenging the pre-combustion chamber and the starting time for introducing fuel gas into the pre-combustion chamber can be conveniently adjusted according to actual working condition requirements; and secondly, the scavenging effect and efficiency of the pre-combustion chamber can be effectively improved, so that the risk that fuel gas in the pre-combustion chamber leaks into a main combustion chamber of the engine is effectively reduced.

The invention relates to a variable exhaust high-power two-stroke industrial engine, and belongs to the technical field of internal combustion engines. The engine comprises an engine body, an exhaust assembly and an air inlet control unit. The air inlet control unit is composed of a reed valve, an air filter, an electronic control unit and a reed pipe. The reed valves are hinged through an adjustable pin shaft, and a closed-loop feedback control loop is formed by combining non-contact detection of the reed pipes; the electronic control unit dynamically adjusts the opening angle and frequency of the reed valve through a fuzzy algorithm based on the rotating speed signal and the accelerator opening degree, and the scavenging efficiency is optimized; a rotatable baffle driven by a stepping motor is arranged in a three-way catalytic assembly of the exhaust assembly, the opening degree of the rotatable baffle is linked with an air inflow signal, and dynamic matching of exhaust back pressure and catalytic temperature is achieved. The problems that a reed valve of a traditional two-stroke engine is prone to fatigue, the catalytic efficiency is low, and emission exceeds the standard are solved, and the combustion efficiency and the environmental protection performance are remarkably improved.

The utility model discloses an engine scavenging collecting pipe machining device which comprises a lifting platform, the lifting platform is used for conducting lifting motion in the vertical direction, a transferring structure is arranged on the lifting platform, and the transferring structure comprises a first displacement assembly arranged above the lifting platform, a second displacement assembly arranged above the lifting platform and a third displacement assembly arranged above the lifting platform, the first displacement assembly can do linear reciprocating motion in the length direction of the lifting platform. The second displacement assemblies are arranged on the first displacement assembly and can do linear reciprocating motion in the width direction of the lifting platform; and the bearing assembly is arranged on the second displacement assembly and comprises a supporting frame and a plurality of guide rollers rotationally arranged on the supporting frame, and the guide rollers are used for bearing the scavenging collecting pipes. The machining equipment for the scavenging header of the engine can conduct welding operation on components of different models in the three-axis direction, meanwhile, the machining equipment is provided with a plurality of stations, and the welding efficiency can be improved.

The utility model discloses a multipurpose staircase for an exhaust header and an EGB bypass assembly, and relates to the technical field of marine diesel engines, in particular to the multipurpose staircase for the exhaust header and the EGB bypass assembly, which comprises a staircase main frame, the staircase main frame is step-shaped, a lower platform is arranged on a step-shaped platform of the staircase main frame, and an upper platform is arranged on the lower platform. The escalator comprises an escalator main frame, an upper platform is installed at the top of the escalator main frame, detachable handrails are installed at the top of the escalator main frame, connecting lugs are fixedly installed on the handrails, and a chain assembly capable of protecting maintainers on the upper platform is installed between the connecting lugs. According to the multi-purpose escalator for the exhaust header and the EGB bypass assembly, the multiple platforms formed on the escalator main frame can be used for entering a scavenging header manhole cover and operating the EGB bypass assembly correspondingly, the dual-purpose effect of one escalator is achieved, then the multi-purpose escalator is more convenient to use, and personnel can be protected under the action of the chain assembly.

A treatment device for treating a blowby gas of a hydrogen engine, the treatment device including: a catalyst unit provided in an exhaust flow path for circulating an exhaust gas from the hydrogen engine, the catalyst unit for reducing a nitrogen oxide contained in the exhaust gas by using hydrogen as a reducing agent; a scavenging flow path for circulating the blowby gas of the hydrogen engine; a scavenging pump provided in the scavenging flow path, the scavenging pump for scavenging the blowby gas from the hydrogen engine to circulate the blowby gas into the scavenging flow path; a hydrogen separation filter provided downstream of the scavenging pump in the scavenging flow path, the hydrogen separation filter for separating hydrogen contained in the blowby gas to generate, from the blowby gas, a hydrogen gas and a treated gas as a blowby gas obtained after removal of the hydrogen.

The invention aims at providing a large-load unmanned engine system and a control method thereof.The large-load unmanned engine system comprises an engine body assembly, a power assembly and a fuel assembly, the engine body assembly comprises an engine brake, at least two cylinder bodies and at least two spark plugs, and every two cylinder bodies are arranged on the engine brake in a central symmetry mode; the sparking plugs are arranged at the ends, away from the machine brake, of the cylinder bodies respectively, an air inlet hole is formed in the position, between the two cylinder bodies in the same set, of the machine brake, the machine brake and the cylinder bodies are each provided with a scavenging channel, each cylinder body is provided with an exhaust hole, and the power assembly comprises a crankshaft, at least two pistons and at least two connecting rods. The crankshaft is rotatably arranged in the brake, the pistons are slidably arranged in the cylinders respectively, the connecting rods are rotatably connected with the pistons respectively, the connecting rods are rotatably connected with the crankshaft, the fuel assembly comprises at least one air inlet valve and at least one carburetor, the air inlet valves are arranged on the air inlet holes respectively, and the carburetors are arranged on the air inlet valves respectively.

The invention provides a piston combustion chamber suitable for an opposed-piston two-stroke diesel engine, which is characterized in that the combustion chamber structure is a half-rugby-type structure, two opposed notches are formed in the edges of the two sides of a piston, the middle of the half-rugby-type structure is in a concave bowl shape, and the inner wall surface of the half-rugby-type structure is a smooth surface; the two oppositely-arranged notches are correspondingly formed in the central axis of the combustion chamber, the two oil sprayers are oppositely arranged and located at the two oppositely-arranged notches, each oil sprayer is provided with three oil spraying holes, and the oil beam included angle formed by the three oil spraying holes is smaller than the taper angle formed by connecting lines from the top faces of the oil sprayers to the center of the bottom of the boss. According to the two-stroke diesel engine, the good scavenging performance of an original combustion chamber structure can be guaranteed, oil and gas can be rapidly and fully mixed on the basis that materials of the combustion chamber are not changed, the combustion process is improved, and the combustion efficiency is improved.

The utility model provides an overhead valve guide air inlet type two-stroke engine which solves the problems that waste gas cannot be fully swept away due to the fact that a four-stroke working mode of a traditional overhead valve type engine is improved into a two-stroke working mode, and combustion efficiency and emission performance are poor. According to the technical scheme, the overhead valve guide air inlet type two-stroke engine comprises an engine body set and an air distribution mechanism provided with an overhead valve, an air guide pipe moving along with an air inlet valve rod through a support sleeve is arranged on the air inlet valve rod of the air distribution mechanism, the air guide pipe is close to the head of the air inlet valve, and a front end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve. The rear port of the gas-guide tube communicates with the gas inlet channel; an air inlet cam of the air distribution mechanism is provided with an air inlet cam protruding part which pushes the front end of an air guide pipe of an air inlet valve to stretch into an inner cavity of the air cylinder body. By guiding and scavenging the inlet air, the engine can go deep into the cylinder body to purge the combusted waste gas, open the exhaust valve to work and fully sweep the waste gas, so that the scavenging efficiency is greatly improved, and the combustion efficiency and the emission performance are improved.

The disclosure relates to a tank ventilation apparatus for a motor vehicle which has a scavenging line which is arranged between an activated-carbon container and an intake line of the motor vehicle and in which an electrically driven scavenging pump is arranged. Furthermore, an electrically controllable directional control valve is provided in the scavenging line between the activated-carbon container and the electrically driven scavenging pump.

To provide an electric vehicle capable of suppressing deterioration of electricity efficiency. [Solution] An electric vehicle includes an internal combustion engine (10), a first motor-generator (310), and a control device (100). A processing circuit (110) of the control device (100) performs scavenging operation by rotating the internal combustion engine (10) with the first motor-generator (310) after its autonomous operation has been stopped. When an execution condition for the scavenging operation is met, the processing circuit (110) acquires the engine rotation speed at that time as a first rotation speed and sets a second rotation speed as a target value for the engine rotation speed during the scavenging operation. After the autonomous operation of the internal combustion engine (10) is stopped based on the execution condition for the scavenging operation being met, the processing circuit (110) controls the first motor-generator (310) to reduce the engine rotation speed to the second rotation speed while maintaining the engine rotation speed at a value between the first rotation speed and the second rotation speed. The processing circuit (110) starts scavenging operation based on the engine rotation speed being reduced to the second rotation speed through control of the first motor-generator (310).

The application relates to the technical field of ship power control, and discloses a ship power system energy efficiency optimization control system based on multi-sensor fusion, which comprises the following modules: a multi-source data acquisition module, which is used for synchronously collecting hull, shafting and air path parameters; a kinematics mapping calculation module, which is used for calculating a propeller transient immersion index; a phase extraction and mode determination module, which is used for extracting a wave phase and an amplitude output mode signal; a fuel mechanical dynamics feedforward module, which is used for generating an oil injection instruction according to the amplitude and the immersion index derivative; an air thermodynamics cooperative control module, which is used for controlling a valve and starting a scavenging blower according to a phase angle; and a long-term energy efficiency optimization module, which is used for finely adjusting a main rotating speed setting value according to an energy efficiency cost function gradient. The technical scheme of extracting the transient immersion index and the fluctuation amplitude to dynamically adjust the rotating speed control dead zone and superimpose a negative fuel feedforward instruction is adopted, so that the technical effects of suppressing abnormal fluctuation of the main engine rotating speed under high sea conditions and reducing unnecessary fuel consumption are achieved.

The present invention discloses a two-stroke engine system and a control method thereof, comprising a cylinder and an ECU electronic control unit, wherein two exhaust ports are respectively located on opposite side walls of the cylinder wall and are positioned horizontally, a plurality of scavenging ports are arranged on the cylinder wall in a horizontal arrangement relative to the cylinder wall, and the intake direction of the scavenging ports is at an angle of 10°-20° with the tangent direction of the cylinder wall, thereby causing the incoming fresh air to form a swirl flow within the cylinder; two methanol injectors and a high-pressure injector are disposed within the cylinder head, and the nozzles of the methanol injector and the high-pressure injector both extend into the combustion chamber; two diesel injectors are also disposed within the cylinder wall, located between the exhaust ports and the scavenging ports, and their nozzles extend into the combustion chamber; the ECU electronic control unit is configured to control the injection of the methanol injector, the diesel injector, and the high-pressure injector according to the engine load. The present invention controls the injection ratio of the diesel injector and the methanol injector according to the engine operating condition, and controls whether the high-pressure injector participates in enhancing the mixing of the mixture.

An opposed-piston engine includes: a cylinder; a scavenging-side piston; an exhaust-side piston; and a first fuel injection device and a second fuel injection device which are disposed offset in a circumferential direction so as to face each other across a central axis of the cylinder 2, and which inject fuel between the scavenging-side piston and the exhaust-side piston. A cavity of the scavenging-side piston and the exhaust-side piston includes: a first cavity part including a first widening part in which the width increases from a central part of each of the scavenging-side piston and the exhaust-side piston toward the side where the first fuel injection device is disposed; and a second cavity part including a second widening part in which the width increases from the central part of each of the scavenging-side piston and the exhaust-side piston toward the side where the second fuel injection device is disposed. The first widening part and the second widening part each have the smallest width at a connection part between the first widening part and the second widening part.