83 results about "Scavenging" patented technology

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.

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 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.

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 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.

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 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.

In a method for operating an internal combustion engine (10) with gaseous fuel, compressed air is supplied to a combustion chamber (14) at least temporarily by means of an exhaust gas turbocharger (24). Furthermore, scavenging is active at least temporarily in this method. It is proposed that when scavenging is active, and depending on the result of an evaluation of a parameter that characterizes a target power increase, a measure is implemented to limit exhaust back pressure.

A turbine engine includes a first gearbox lubricated by oil. A first sump located below the first gearbox collects oil. The first purge element pumps oil from the first sump in an operating state and does not pump oil in a fault state. The second gearbox is also lubricated by oil. A second sump located below the second gearbox collects oil. A second purge element pumps oil from the second sump in an operating state and a fault state. A conduit connects the first tank to the second tank to transfer the overflow oil from the first tank to the second tank in a fault condition, the overflow oil combining with the oil in the second tank when the oil in the first tank reaches a threshold level.

This invention belongs to the field of engine technology and discloses an engine control method and an engine. The engine control method includes: determining the limiting crankshaft angle range corresponding to the start of scavenging in the pre-combustion chamber based on a preset injection pressure and a preset injection quantity; determining the conditions for starting scavenging in the pre-combustion chamber based on the temperature and pressure of the main combustion chamber, the preset injection pressure, and the limiting crankshaft angle range; and initiating scavenging in the pre-combustion chamber with the preset injection pressure and preset injection quantity. By employing this engine control method, the scavenging quality and efficiency of scavenging in the pre-combustion chamber can be effectively improved, as can the ignition efficiency and ignition reliability of igniting the combustion gases within the pre-combustion chamber.

The utility model belongs to the technical field of engine pistons, and discloses a transverse flow scavenging outboard engine piston which comprises a piston body and an air cylinder, and the piston body comprises a piston skirt part, a piston head part and a piston convex top. Through cooperation of a piston convex top, a piston pin, a first flow guide angle, a second flow guide angle and other structures, the device has the effects of being high in scavenging efficiency and reducing oil consumption, the piston body moves to the exhaust hole, waste gas in the air cylinder is exhausted from the exhaust hole through the first flow guide angle, then the piston body continues to move downwards, and the effect of reducing oil consumption is achieved. Through the design of the second flow guide angle on the convex top of the piston, waste gas in the air cylinder is guided out through the second flow guide angle, and when the piston body crosses a lower dead center to move upwards, mixed gas is guided through the convex top of the piston, so that the waste gas in the air cylinder is removed more thoroughly, and the effect of few waste gas residues is achieved; and the performance of the engine is improved.

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-control geometry (10) located downstream of the sealing seat (7).According to the invention, the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), wherein the attachment body (8) has a hollow cylindrical section in the area of ​​the sealing seat (7), to which an outflow area (16) with at least one outflow opening (17) having an inner contour (9) is connected, which opens into an end side (25) facing the combustion chamber (20), wherein in the transition from the hollow cylindrical section to the at least one outflow opening (17) the inner contour (9) has a trough-like section (22), from which at least one additional opening (24) is connected with the outer contour of the attachment body (8) in order to improve a scavenging behavior from the outflow opening (17).

To improve startability of an engine regardless of a state of a lock pin in a variable valve train in an engine control device.SOLUTION: An engine control device 30 includes a setting part 31 and a control part 32. When the engine 1 is stopped, the setting unit 31 sets the flag to ON if the oil temperature of the engine oil that drives the variable valve mechanism 10 is equal to or lower than a predetermined temperature, and sets the flag to OFF if the oil temperature exceeds the predetermined temperature. At the start of the engine 1, the control unit 32 performs the normal control when the flag is off, and performs the scavenging control and the normal control when the flag is on. The normal control is a control for starting the engine 1 by cranking while performing both fuel injection and ignition. The scavenging control is control for scavenging the inside of the combustion chamber by cranking without performing both fuel injection and ignition.SELECTED DRAWING: Figure 1

The application discloses a turbocharger and cam phase coordinated control method, device, controller and storage medium. The method part comprises the following steps: when a target cam enters a scavenging mode, a difference between a target intake manifold pressure and an actual intake manifold pressure is obtained; whether a dynamic cam phase coordination function is activated is judged according to the difference between the target intake manifold pressure and the actual intake manifold pressure; a dynamic cam phase coordination control coefficient corresponding to an activation condition of the dynamic cam phase coordination function is obtained; a target phase angle corresponding to the target cam is determined according to the dynamic cam phase coordination control coefficient and an engine operating condition; and the phase of the target cam is adjusted according to the target phase angle.

The invention relates to a divisional application of which the application number is 202510973180. X. The invention discloses a two-stroke engine, and belongs to the technical field of engines. The two-stroke engine comprises a cylinder body and a piston, the cylinder body is provided with an air inlet, an air outlet and a scavenging channel, the hole wall of a combustion chamber is provided with a pair of first scavenging ports, a pair of second scavenging ports and a pair of third scavenging ports, and the air blowing elevation angles of the first scavenging ports, the second scavenging ports and the third scavenging ports are sequentially reduced. And the pressure applying device is used for applying gas pressure deviating from the exhaust port to scavenging gas generated by the scavenging port which is opened later to scavenging gas generated by the scavenging port which is opened first. According to the two-stroke engine, by means of the gradient change of the blowing elevation angles of the three pairs of scavenging ports, the combustible mixed gas is stabilized through scavenging airflow with the smaller elevation angle step by step, the situation that cyclone is formed and mixed with waste gas is prevented, effective separation of the scavenging gas and the combustion waste gas is achieved, the fuel oil utilization rate of the two-stroke engine is increased, tail gas emission is improved, and the service life of the two-stroke engine is prolonged. And the effects of energy conservation and emission reduction are achieved.

The application discloses a precombustion chamber jet piloting device integrated on a piston, which is characterized by a concave pool in the center of the top of the piston, an upper part of the concave pool being provided with a fence, a spherical flame injector being nested and welded in the fence above the concave pool, and the spherical flame injector covering the concave pool to form a cavity chamber. A plurality of jet pipes are arranged in the spherical flame injector. Two precombustion chambers are respectively communicated with the two sides of the fence, and the two precombustion chambers are located in the same plane but are asymmetrically arranged. The cavity chamber is provided with two conical passages respectively communicated with the two precombustion chambers, and two piloting injectors are respectively connected with the two precombustion chambers; two main fuel injectors are connected with a cylinder. The included angle between the central axis of the main fuel injector and the vertical direction is 120-140 degrees, and a scavenging port is arranged at the lower part of the cylinder. The main fuel enters the two precombustion chambers through the spherical flame injector, and the flame generated by the precombustion chamber ignites the main fuel in the cylinder through the spherical flame injector. The structure shortens the flame propagation distance and prevents the knocking phenomenon generated in the combustion chamber.

A fuel valve (30) for injecting fuel into a large two-stroke turbocharged straight-flow scavenging internal combustion engine has an axially displaceable valve needle (35) cooperating with a valve seat (36) in a valve body, a cylindrical distal end section (39) of the valve needle (35) being located in a nozzle (40), the cylindrical distal end section (39) being provided with a sealing ring (52).

The invention discloses a structure for improving scavenging efficiency of a two-stroke gasoline engine and a working method thereof, and belongs to the technical field of internal combustion engines, the structure comprises an air cylinder and a crankcase which are connected into a whole, and a piston capable of reciprocating is arranged in the structure; an exhaust hole and a ventilation hole are formed in the cylinder wall of the cylinder; a spark plug is arranged on a cylinder cover of the cylinder; the interior of the crankcase is divided into an upper area and a lower area which are relatively independent, the upper area is communicated with the air inlet hole and an outlet of the carburetor respectively and used for forming gas mixture, the two ends of the lower area are communicated with the air inlet hole and the ventilation hole respectively, and the upper area and the lower area are communicated through a second one-way valve; the air inlet selectively communicates with the upper area and the lower area of the crankcase through the first one-way valve. The device is simple in overall structure, easy to implement and low in improvement cost, the fresh mixed gas and the waste gas are fundamentally prevented from being directly mixed and discharged from the exhaust port in a short-circuit mode, and the purposes of improving the utilization rate of the mixed gas and reducing fuel consumption and pollutant emission are achieved.

The application relates to the engine technical field, and particularly provides a two-four stroke variable engine, which comprises a cylinder body, a piston arranged in the cylinder body, and a main combustion chamber defined between the cylinder body and the top of the piston. The engine further comprises a first air inlet part, a second air inlet part and an exhaust valve. The first air inlet part is arranged at the top of the cylinder body and outputs mixed gas to the main combustion chamber when the engine is in a four-stroke mode, and outputs mixed gas to the main combustion chamber to perform a first scavenging process and a second scavenging process when the engine is in a two-stroke mode. The second air inlet part is arranged at the side of the cylinder body and outputs mixed gas to the main combustion chamber to perform a second scavenging process and a third scavenging process when the engine is in the two-stroke mode. The exhaust valve is arranged at the top of the cylinder body and has an open state and a closed state, and is kept in the open state to cooperate with the first air inlet part and the second air inlet part to perform the first scavenging process, the second scavenging process and the third scavenging process when the engine is in the two-stroke mode.

The invention relates to a method and to a device for operating an internal combustion engine having a supercharging system, which has an exhaust gas turbocharger (ATL) and an electrically driven compressor. The power of the ATL can be adjusted by an adjusting device. The method comprises:-determining a predetermined boost pressure for achieving an increased predetermined torque of the engine; -adjusting the supercharging system to form an actual supercharging pressure in accordance with the predetermined supercharging pressure; and setting a positive scavenging pressure drop in the cylinders of the internal combustion engine as a primary reference variable for controlling the supercharging system.

A two-stroke internal combustion engine (1) having a number of cylinders (2) in which pressurized working gas can work-performingly expand, as a result of which a crankshaft (8) is driven, wherein the gas outlet window (16) in the or each cylinder (2) is connected to an exhaust system (12) via an outlet duct (18), and wherein a switchable multi-way switching valve (30), via which the gas outlet window (16) is connected both to the exhaust system (12) and to a fresh-gas overpressure line (32), is located in the outlet duct (18), is intended to be still further improved in particular in terms of scavenging, fuel or lubricant consumption and durability. For this purpose, according to the invention, the multi-way switching valve (30) is designed as a controllable rotary valve (44) for operation at a rotational speed of an integer multiple of the rotational speed of the crankshaft (8).

The utility model relates to the technical field of methanol engines, and discloses a methanol injection device for a methanol engine, which comprises a gas inlet pipe, a plurality of gas inlet channels uniformly distributed along the length direction of the gas inlet pipe, combustion cylinders arranged at the gas outlet ends of the gas inlet channels, and a methanol input pipe arranged on the gas inlet pipe, the methanol input pipe is provided with a plurality of output ports, each output port is provided with a methanol injector, and the injection end of each methanol injector extends to the bottom of the inner cavity of the gas inlet channel so as to inject atomized methanol. The methanol input pipe supplies methanol to the methanol ejectors of the air inlet channels through the output ports, independent ejection of each cylinder is achieved, the ejection ends of the ejectors directly eject atomized methanol into the nose bridge position of the spiral air channel, so that the methanol and air form combustible mixed gas in the spiral air channel, and the combustion effect is improved. The air-fuel ratio deviation and scavenging loss caused by mixing of a traditional header pipe are avoided, the combustion efficiency is remarkably improved, harmful emission is reduced, and the clean combustion requirement is met.

The invention discloses a shutdown control method for reducing engine oil emulsification of a range extender gas engine, which comprises the following steps that: a VCU (Vehicle Control Unit) acquires the driving power demand of a whole vehicle, the current SOC (State of Charge) value of a power battery and the working states of engine driving devices such as an air conditioner and an air pump in real time, and transmits a signal that the target generated power is 0kW to an RCU (Remote Control Unit) after comprehensive judgment; an engine stop instruction is selectively sent according to the working conditions; after the RCU receives the double instructions, a torque withdrawal instruction is immediately sent to the ECU to control the engine to withdraw torque gradually, and impact caused by sudden torque drop is avoided; meanwhile, an idling instruction is sent to the GCU, so that the rotating speed of the FISG slowly falls back to the idling speed; after the FISG reaches the idling speed, the ECU controls the engine to maintain the idling speed for 1-5 minutes to evaporate water vapor, and then fuel gas injection is stopped; when the rotating speed of the engine is reduced to 400 rpm and spraying is stopped, the RCU enables the FISG to drag a crankshaft at 400 rpm for 4-10 seconds for scavenging, and a signal is synchronously fed back to the VCU; after receiving the starting signal, the VCU is started for 11-15 seconds for time delay, and after receiving the ending signal and ending the time delay, high-voltage electricity disconnection is executed. The method solves the problem of engine oil emulsification when the engine is shut down.

The present disclosure provides a large two-stroke uniflow scavenged turbocharged internal combustion engine, comprising: a plurality of cylinders that generate an exhaust gas stream containing NOx; a turbocharger system (5) having an exhaust gas driven turbine (6) and a compressor (7), the turbocharger system for supplying scavenging air; an SCR reactor (28) in the exhaust gas system; a reductant supply system (25, 26, 27) for adding a metered flow of reductant to the exhaust gas; a NOx sensor unit (32) configured to generate an output corresponding to a NOx concentration in the exhaust gas; and a valve (36, 37) configured to selectively supply exhaust gas originating from a location upstream or downstream of the SCR reactor (28) to an inlet of the NOx sensor unit (32). The engine enables improved monitoring and control of the NOx reduction rate of the SCR reactor (28).

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:VGVGB.VG is a gutter volume of the gutter and VGB is a gearbox volume.

To achieve both promotion of diffusion and combustion of liquid fuel and gas fuel, and suppression of coking of an injection port in a gas injection valve.SOLUTION: The engine 1 combusts the gas fuel and the liquid fuel in the same cylinder 16. The engine 1 includes the cylinder 16 that forms the combustion chamber 17, the scavenge port 14a that generates the swirling flow by the air by regulating the flow of the air sucked into the cylinder 16, and the gas injector 30 that injects the hydrogen gas into the combustion chamber 17 so that the hydrogen gas flows in accordance with the swirling flow. When viewed along the center line C of the cylinder 16, the length (first length R1) between the gas injector 30 and the center line C is longer than the length (second length R2) between the liquid injector 40 and the center line C.SELECTED DRAWING: Figure 5

The application discloses a heat regenerative device with dual functions of engine and heat pump and an operation method thereof. The heat regenerative device comprises a cylinder, a piston, an ejector, and a low-temperature cavity, a low-temperature heat exchanger, a high-temperature heat exchanger and a high-temperature cavity connected in sequence. The piston, the ejector, the low-temperature cavity and the high-temperature cavity are located in the cylinder. The swept volume of the piston constitutes a compression cavity. The heat regenerative device with dual functions of engine and heat pump further comprises a control valve assembly for controlling the communication and disconnection between the compression cavity and the low-temperature cavity and the communication and disconnection between the compression cavity and the high-temperature cavity. The operation method is as follows: when operating in the engine mode, the control valve assembly communicates the compression cavity with the low-temperature cavity and disconnects the communication between the compression cavity and the high-temperature cavity; when operating in the heat pump mode, the control valve assembly disconnects the communication between the compression cavity and the low-temperature cavity and communicates the compression cavity with the high-temperature cavity.

A fuel valve (30) for a large two-stroke turbocharged uniflow scavenging internal combustion engine and such an engine comprising a fuel valve (30). The fuel valve (30) includes an elongate fuel valve body (32) and a nozzle body (40) releasably attached to the fuel valve body (30). The elongate valve member (35) is axially displaceable between a closed position and an open position. The valve member (35) comprises a proximal end portion (35a) and a distal end portion (35b), the distal end portion (35b) being arranged to axially move in unison with the proximal end portion (35a) between a closed position and an open position, the distal end portion (35b) being arranged to be radially displaceable relative to the proximal end portion (35a).

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.