356 results about "Scavenging" patented technology

An internal combustion engine of either two-cycle or four-cycle construction including a block having at least one cylinder bore therein having sidewalls carrying a liner of a structural fiber reinforced ceramic matrix composite material disposed in sealed fiber reinforced sliding relationship within the cylinder bore, and a cylinder head sealing atop end of the cylinder bore to form a closed combustion chamber in combination with the piston. The cylinder head also has the structural fiber reinforced ceramic matrix composite material disposed on an inner surface thereof facing the combustion chamber. The preferred engine is a two-cycle engine having an externally scavenged intake system and an oil sump lubricating system thereby eliminating the need to separately mix or inject lubricating oil. Higher operating temperatures and closer tolerances allow higher fuel efficiency and less pollutant production. A preferred structural fiber reinforced ceramic matrix composite material and the method of making same is also disclosed.

There is provided a method for manufacturing a cylinder for an internal combustion engine by making use of an insert core, which makes it possible to manufacture the cylinder by a die casting method such as a high-pressure die casting method at low cost and in high accuracy. The insert core to be employed herein includes: a cylindrical body having substantially the same outer diameter as the diameter of bore of the cylinder to be obtained; a scavenging port-forming portion projecting radially outward from the cylindrical body and having substantially the same cross-sectional configuration as that of the scavenging port; a suction port-forming portion projecting radially outward from the cylindrical body and having substantially the same cross-sectional configuration as that of at least the cylinder bore-side end portion of a suction port; and an exhaust port-forming portion projecting radially outward from the cylindrical body and having substantially the same cross-sectional configuration as that of at least the cylinder bore-side end portion of an exhaust port.

The invention discloses a carbon deposit scavenging agent for a combustion chamber and a spark plug, and a preparation method of the same. Water is taken as a medium for the scavenging agent, so that the scavenging agent is safe and environmentally friendly, and produces no secondary pollution. The scavenging agent comprises the following components: 2-10 wt% of non-ionic polyethenoxy ether surfactant; 2-8 wt% of anionic fatty acid salt surfactant; 5-20 wt% of alcohol, alcohol ether and ketone organic solvent; 0.5-5 wt% of inorganic base; 0-2 wt% of buffer; 0-3 wt% of metal corrosion inhibitor; and 50-91.5 wt% of deionized water. The composite surfactant used in the scavenging agent can emulsify the carbon deposit effectively so as to soften, loosen and deform the inflexible carbon deposit, and simultaneously can improve the seepage force of the scavenging agent; the alcohol organic solvent further dissolves the carbon deposit; the inorganic base decomposes oil and fat compounds; the buffer maintains certain basicity; and the corrosion inhibitor reduces corrosion on metallic elements in a cleaning process. The carbon deposit scavenging agent provided by the invention can eliminate the carbon deposit adhered to the top of a combustion chamber piston, an intake valve, a vent valve, the spark plug and the inner wall of a spark plug hole, quickly and efficiently. The scavenging agent provided by the invention is completely prepared by environmental materials, and is free of the components, such as aromatic hydrocarbon, halogenated hydrocarbon and the like, which are harmful to human body, so that the scavenging agent is safe for human body and has no pollution to the environment and the atmosphere.

A dual-inlet gear pump includes a drive gear and a driven gear. The invention utilizes the discovery that the drive gear will typically move a higher flow volume than does the driven gear, particularly when the fluid being moved is an air / oil mixture. The present invention takes advantage of this discovery to communicate a first higher expected flow source to the drive gear, and to separately communicate a second, relatively lower expected flow rate to the driven gear. A particular application is in a scavenging pump for a jet engine.

A two-stroke, opposed-piston engine (49) with one or more ported cylinders (c) and uniflow scavenging includes an exhaust gas recirculation (EGR) construction (131) that provides a portion of the exhaust gasses produced by the engine (49) for mixture with charge air to control the production of NOx during combustion.

A controlled auto-ignition or spark ignition two stroke piston engine, fed by homogeneous air-fuel mixture, with crankcase scavenging, in which the amount of air-fuel mixture transferred from the crankcase to the cylinder is not greater than the 50% of the cylinder volume; said engine has reed valves in the transfer ports that connect the crankcase to the cylinder to control the internal dynamics of the air-fuel mixture, limiting the instantaneous maximum flow that is transferred to the cylinder in order to achieve the best stratification level among the air-fuel mixture and the exhaust residual gases, getting this way the thermo chemical activation of part of the fuel contained in the mixture. Said engine also has a rotary valve adjacent to the cylinder exhaust port that rotates in synchronism with the crankshaft, which closes the exhaust port a few degrees after the piston reaches the bottom dead center, thus preventing the leakage of the thermo chemically activated mixture and holding part of the burnt gases inside the cylinder. Then, during the compression stroke, more heat is given to the thermo chemically activated mixture decomposing part of the fuel contained in it into activated radicals which act as igniters when close to the top dead center firing the mixture in a simultaneous and complete way, thus obtaining very low levels of CO, HC and Nox emissions, as well as low fuel and oil consumption.

In a two-stroke engine (1) according to the present invention, a piston (6) has a communication passage (28) opened to a crank chamber (10). An air intake port (30) is provided on an inner surface (2a) for causing air to flow into the communication passage (28). After a scavenging port (22) is closed by an outer surface (6a) of the piston (6) moving from the bottom dead center to the top dead center, the communication passage (28) is opened in the outer surface (6a) of the piston so as to communicate with the air intake port (30) and the scavenging port (22).

The intermittent linear motor of this invention incorporates features which enhance the exhaust scavenging and cooling processes, as well as simplifying overall construction including a compression plenum below the piston where air displaced during a power stroke by the piston is immediately transferred through the combustion chamber allowing said compressed air to immediately begin scavenging exhaust gases as the piston is returned further displacing spent gases from the motor.

A method for a hybrid-electric vehicle may comprise, while the hybrid-electric vehicle is moving and in an absence of fuel being directed to an engine, directing engine intake air through an ejector to supply vacuum to a brake booster independent of a brake booster vacuum.

The invention discloses a starting cylinder of a piston reciprocating internal combustion engine and an air exhausting device of the starting cylinder of the piston reciprocating internal combustion engine. The starting cylinder and the air exhausting device are mainly characterized in that the mode that an air exhausting opening is formed in a starting cylinder cover plate, namely an engine cover plate, of an existing four-stroke or two-stroke direct current scavenging engine and connected with an air exhausting channel is changed into the mode that the air exhausting opening is formed in the side of a starting cylinder body and connected with the air exhausting channel, and meanwhile a mushroom-shaped vent valve is changed into a gate vent valve; in this way, the problem that a working mechanism must be arranged on the engine cover plate or multiple working parts are difficult to arrange is solved, damage, caused by air exhausting heat loads, to the engine cover plate and the arrangement on the engine cover plate is avoided, and indispensable conditions are particularly created for multiple overhead working systems and an overhead comprehensive regulating and control system which are invented in the ZL200710193939.4 invention with the publication patent number CN101205861B and a novel piston reciprocating internal combustion engine invented in the ZL200710193938.X invention with the publication patent number CN151289956B, wherein according to a pressurizing mechanism combination of the novel piston reciprocating internal combustion engine, energy is greatly saved, stains are greatly removed, and the specific weight of the engine is greatly reduced.

The herein disclosed Compression Ignition By Air Injection (CIBAI) cycle and internal combustion engine has following advantages over Otto and Diesel cycles: higher thermal efficiency and operating like a stratified charge engine on lean mixtures. More reliable by lack off: spark ignition, high-pressure fuel pump and injectors; throttle valve and cold starting problems. Only one valve is required in addition to the usual I.C. engine components. However the CIBAI cycle requires one or more pairs of piston / cylinders to operate together in phase. During the compression stroke a closed cylinder-connecting valve isolates the cylinders. One cylinder compresses an air-fuel mixture to below knock level. The other cylinder compresses only air to high pressure and temperature. Near top dead center, the cylinder-connecting valve opens allowing the high-pressure air to compress, heat and ignite the pre-evaporated air-fuel mixture. This valve remains open during following power stroke and scavenging of exhaust products.

The invention discloses a two-stroke stratified scavenging engine mainly comprising an air scavenging part and a mixed gas scavenging part. The air scavenging part mainly comprises an air storage chamber (10) and an air scavenging passage (15); two ends of the air scavenging passage (15) are communicated with an air scavenging orifice (16) arranged in the inner wall of one side of a cylinder block (2) and the air storage chamber (10); the mixed gas scavenging part mainly comprises mixed gas scavenging passages (17 and 19); the mixed gas scavenging passages are hollow passages formed by the outer surface of a piston (6) and grooves arranged in the inner wall of the cylinder block (2); two ends of the mixed gas scavenging passages (17 and 19) are communicated with mixed gas scavenging orifices (18 and 20) arranged in a cylinder (3) and a crankcase (5). The technical scheme of stratified scavenging with the independent air scavenging passages is provided, short-circuit loss of fresh mixed gas is greatly reduced, and harmful emission of the engine is reduced.

The invention discloses a two-stroke engine capable of scavenging in an air pilot mode, which is characterized in that a cylinder is symmetrically provided with a closed-structure scavenging duct; the structure is realized by symmetrically arranging side covers on two sides of the cylinder; one side of the scavenging duct of the cylinder is connected with an air storage cavity; one check valve combination is positioned between the air storage cavity and an admission pipe; a carburettor and the admission pipe are respectively provided with two relatively-independent inlet paths; a case is provided with a case scavenging duct; the case scavenging duct causes a crank chamber to be communicated with a cylinder scavenging duct by the main bearing ball gap of a crank case; flammable mixed gas in the crank chamber is fully mixed when passing through a bearing hole ball which rotates at high speed and is burnt more fully; and fresh air in the air storage chamber is pressed into the cylinder by the pre-compressed flammable mixed gas when scavenging to scavenge firstly. The two-stroke engine can improve fuel pulverization, improves combustion efficiency, effectively lowers harmful ingredients, such as HC, CO and the like in tail gas, and improves the economical efficiency of the engine.

The invention relates to energy conservation and emission reduction, and belongs to a petrol engine for turbulence reversing emission reducing of a logarithmic differentiation isogonal line skirt edge of a piston skirt. In order to pursue scientific exploration, various improvements of spark plugs, such as adding internal inductive reactance in various fixed electrodes, changing external division couplers, adding casing cooling fins and adding movable and micro-motion electrodes, are provided; the assortment of combustion chambers including a function wave combustion chamber and a function wave combustion chamber with a parabolic convex-concave adapter and various ignition devices is also provided; a double-auxiliary skirt edge is added at the piston skirt; and scavenging air duct openings of a cylinder body are provided, are symmetrically provided with two tapered wedge turbulence reversing pieces (46) on left and right sides, and comprise scavenging air duct openings (47) of the tapered wedge turbulence reversing pieces, tapered wedges (48) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, reversing grates (49) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, and turbulence shields (50) leading to the scavenging air duct openings of the tapered wedge turbulence reversing pieces, so turbulence at the scavenging air duct openings can be conveniently produced to block the reversing of waste gas, and the discharge value can be conveniently reduced to reach the standard. The petrol engine has the benefits that the petrol engine is beneficial to helping guide, emission and noise reduction, and lubricating and heat dissipation, ignition is reliable, and the efficiency is improved.

A valve is used with a carburetor, and the carburetor therefor. The valve has a throttle valve and an air valve. The air valve defines an air bore and has a baffle disposed within the air bore. The baffle separates one section of the air bore from another section, and impedes airflow through the air bore during at least some positions of the air valve.

A two-stroke internal combustion engine is provided. The engine includes a block defining a crankcase for enclosing a fuel mixture and a cylinder chamber formed at an end of a cylinder bore, an air passage in fluid communication with the cylinder bore, a scavenging transfer passage communicating between the crankcase and the cylinder chamber and having a primary transfer port in communication with a secondary transfer port, the secondary port having a first and a spaced-apart second window with a bridge spanning the space therebetween, and a piston slideably positioned in the cylinder bore and having a channel formed in a periphery of the piston and having a piston opening defined therein for providing selective communication between the crankcase and the transfer passage.

The invention discloses a method for calculating blown gas displacement of a two-stroke low-speed diesel engine for a boat. The method comprises the following steps: calculating blown gas flow rate, exhausted smoke flow rate and amount of gas discharged to an exhausted smoke collection box in different stages of a ventilation process in real time by adopting a mathematic model; calculating the amount of waste gas freely exhausted in single circulation, gas input and output quantity during a gas blowing process and the amount of exhausted gas during a post-exhausting process by utilizing an ideal gas state equation in combination with a gas distribution phase position; obtaining the blown gas flow rate and the exhausted smoke flow rate according to the quantity and rotating speed of air cylinders of the two-stroke low-speed diesel engine for the boat. The method disclosed by the invention can be used for rapidly and accurately predicting the blown gas flow rate and the exhausted gas flow rate, is high in universality and provides reliable data support for analyzing the working state of the diesel engine and improving the performance of the diesel engine.

The invention relates to a diesel engine and a method for increasing power of a diesel engine. The diesel engine comprises at least one turbocharger stage, at least one exhaust gas aftertreatment system, and a compensation device not driven by the turbocharger stage, wherein the at least one exhaust gas aftertreatment system has a certain number of units for guiding exhaust gas, and the compensation device is at least one auxiliary air blower which is driven independent of the turbocharger stage. According to the invention, the auxiliary air blower is at the downstream of the turbocharger stage, is arranged at a pipeline section at a high pressure side of scavenging gas from the turbocharger stage to a plurality of combustion chambers, and is designed for continuously running in the whole load range of the diesel engine and assisting the turbocharger stages when the combustion chambers are subjected to pressurization, thereby assisting the turbocharger stages to compensate the reduction in the pressure difference used for the turbocharger stages at the high pressure side of the scavenging gas of the turbocharger stages with the exhaust gas aftertreatment when the combustion chambers are subjected to the pressurization.

The invention relates to an internal combustion engine which is provided with at least one cylinder (1) and a device used for recycling the exhaust gas. The cylinder is provided with an working chamber (2) which is limited by a reciprocating piston (3) and is loaded by the scavenging gas comprising compressed gas and fuel. The working chamber is provided with at least one scavenging gas inlet (6), at least one fuel inlet and at least one exhaust gas outlet (5). An exhaust duct (9) is connected with the exhaust gas outlet. A pressure impact (19) is generated in the exhaust duct (9) through the exhaust flowed out from the opened exhaust outlet (5). Through a device used for exhaust recirculation, one part of the exhaust can be used as the recirculation gas for being directly or indirectly guiding into the working chamber (2). Thus the dilution of the recirculation gas by the scavenging gas is prevented and a simple structure is realized. A recirculation gas outlet (21) is leaded out from the exhaust duct (9) connected with the exhaust outlet (5). The recirculation gas outlet can be closed through an attaching valve (22). The valve opens the attaching recirculation gas outlet (21) in an area between increasing and reducing the pressure impact (19) generated in the exhaust duct (9).

The invention discloses a fan two-stroke engine which comprises a contraposition piston two-stroke engine or a uniflow scavenging two-stroke engine, and further comprises an electric fan. An air outlet of the electric fan is arranged in a distribution channel of the contraposition piston two-stroke engine or the uniflow scavenging two-stroke engine. The air erupting direction of the air outlet takes the air flow direction in the distribution channel as overall directing. The fan two-stroke engine leaves out a supercharger, lowers energy consumption of the engine, reduces production cost of the engine, and achieves the normal starting of the contraposition piston two-stroke engine or the uniflow scavenging two-stroke engine.

The invention relates to energy conservation and emission reduction, in particular to an emission-reduction two-stroke gasoline engine with scavenging passage wedge turbulent flow return sheets. The emission-reduction two-stroke gasoline engine is characterized in that in order to pursue scientific exploration, many improvements are performed on a spark plug such as internal inductive reactance is added on various fixed electrodes, an external dividing coupling is improved, a casing radiating fin is added, and especially a moving electrode and a micro electrode are arranged. In addition, combustion chambers are matched with various ignition devices, wherein the combustion chambers include combustion chamber with function waves and parabolic combustion chambers to be convexly and concavely matched and with function waves. A double-auxiliary skirt border is additionally arranged on a piston skirt portion. The wedge turbulent flow return sheets (46) are respectively symmetrically arranged on the left side and the right side of a scavenging passage of a cylinder, and each wedge turbulent flow return sheet comprises a scavenging passage (47), a wedge (48) connected with the scavenging passage, a return rid (49) connected with the scavenging passage and a turbulent flow shield (50) connected with the scavenging passage, and accordingly the emission-reduction two-stroke gasoline engine is favorable for generating turbulent flow at the scavenging passage position to resist waste gas returning and further to reduce emission, and finally the effect of reaching the emission reduction standard is achieved. The emission-reduction two-stroke gasoline engine has the advantages of being favorable for assisting guide, assisting emission reduction and noise reduction and assisting lubrication and heat dissipation, being reliable in igniting and improving efficiency.

The invention relates to a two-cycle combustion engine, comprising at least one cylinder (1) accommodating a piston (2) and provided with a cylinder head, a crankcase (10) which is in fluid connection with the cylinder (1) by way of transfer ports (12 to 16) which are disposed symmetrically opposite of one another with respect to a diametral plane (5) of the cylinder (1) that is determined by the axis of an exhaust port (4), and two injection nozzles (6, 7) for fuel disposed symmetrically with respect to said diametral plane (5), the nozzle axes (8) of which intersect one another above the piston crown (3) in the diametral plane (5) in the bottom dead centre position of the piston (2). In order to create advantageous scavenging conditions, it is proposed that the nozzle axes (8) intersect one another on the side of the cylinder axis facing away from the exhaust port (4) and extend at least approximately in the outflow direction (17) of the transfer ports (12, 13) respectively provided on the opposite side of the diametral plane (5), and the piston (2) comprises a casing opening (21) for injecting fuel into the crankcase (10) on at least one circumferential side facing the injection nozzles (6, 7).

The invention discloses a two-stroke stratified scavenging gasoline engine which comprises a cylinder body, a crankcase, an air inlet pipe and a carburetor, wherein an air inlet, an exhaust opening, secondary scavenging channels and an air storage chamber are arranged on the cylinder body; the secondary scavenging channels are connected with the air storage chamber; a scavenging opening is formed above each secondary scavenging channel in the air storage chamber; two main scavenging channels are respectively connected to two sides of the cylinder body; an air channel is arranged above the air inlet and is directly connected with an air flowing groove in each main scavenging channel; each air channel is connected with the air storage chamber; the two secondary scavenging channels are symmetric about the center of the cylinder body. Due to the adoption of a scavenging mode of placing air at the front side and placing the mixed gas at the rear side, the contents of harmful components in tail gas can be effectively reduced, the discharge of pollutants is greatly improved, the fuel consumption rate of the engine is effectively reduced, and the fuel economy is improved.

A two-stroke LPG engine with an inner metal cover and an outer resin cover for dual-layer cooling and noise control comprises a muffler assembly (F7) having a catalytic hush tube (69); the muffler assembly (F7) is arranged on the two-stroke LPG engine through a muffler pad (F8); the outlet of the muffler assembly (F7) is provided with an inner outlet (F7C2) of the inner metal cover (F7C1), and an outer outlet (F7j2) of the outer resin cover (F7j1) and a transition corner (F7j3) are arranged further outer side, thus realizing dual-layer cooling and noise control. The two-stroke LPG engine with the inner metal cover and the outer resin cover for dual-layer cooling and noise is used for driving a garden machine; the front portion of an LPG miniature propane fuel tank is provided with pipe threads; the fuel enters the engine through a pipe joint and a gas-mix controller; the front portion of the fuel tank is also provided with a safety valve; the tank diameter of the fuel tank is smaller than 100mm, and 465 grams of propane fuel are contained so as to be conveniently replaced by standards; a scavenging path is provided with a filter net, and a filter net is arranged below the scavenging path, thus providing filtering and regulation effect; a catalytic agent is also provided.

The invention discloses a fully variable electro-hydraulic valve system. The fully variable electro-hydraulic valve system comprises a sliding sleeve, a spiral shaft, a piston and a return spring; thesliding sleeve is fixed relative to an engine; the piston butts against a valve assembly; the spiral shaft is axially controlled by a cam surface of a camshaft; the spiral shaft is provided with a spiral groove and a blockage part; when the spiral groove communicates with a limiting oil hole, a sliding sleeve cavity communicates with a low-pressure oil way of the engine for pressure relief; a spiral shaft axial projection portion is arranged at a first end of the spiral shaft; a spiral shaft ejecting plane is arranged on the spiral shaft axial projection portion; a piston axial projection portion is arranged at the end, opposite to the spiral shaft, of the piston; and a piston ejecting plane is arranged at the head portion of the piston axial projection portion. The fully variable electro-hydraulic valve system solves the problem of influence on normal work of the system due to loss of machine oil in the sliding sleeve cavity, keeps the crankshaft rotating angle corresponding to the valve opening time invariable, and is particularly suitable for application to control of the variable travel of an intake valve of an engine in the scavenging process.

The invention discloses a heat storage combustion device with an annular rotating valve. The device comprises a combustion chamber, a heat storage body, an annular gas separation plate and the annularrotating valve; the annular rotating valve is characterized by comprising an annular intake box, an annular scavenging box, an exhaust box, a rotating valve element and a transmission device; the annular scavenging box is mounted between the annular intake box and the exhaust box; a purging intake ring is mounted at the lower part of a purging sleeve of the purging intake ring of the rotating valve element; the purging intake ring is mounted in the annular scavenging box; a sealing piece is mounted between the purging intake ring and the annular scavenging box; the rotating valve element is rotated to purge cleaning gas into the purging intake ring of the purging intake ring from the annular scavenging box; and the annular intake box and the exhaust box are separated by purging cleaning gas with relatively higher pressure in the annular scavenging box, so that leakage of organic waste gas to be treated into the exhaust box is prevented to the greatest extent.

The present invention relates to a method for operating an injection valve of an internal combustion engine, whereby the metering of fuel is adjustable in particular by varying the stroke of the nozzle needle of the injection valve. Methods and injections valves of this type are generally known from the related art. The aim of the present invention is to provide a method which makes it possible to prevent an incomplete closure of the valve due to soiling (the risk of damage caused by a gasoline-filled cylinder) in operating states of the internal combustion engine in which no complete strokes of the nozzle needle occur over a prolonged period of time and the nozzle is therefore not sufficiently scavenged. According to the present invention, the nozzle is scavenged with fuel when a jammed-open operating state of the nozzle needle is detected.

The invention relates to a cylinder assembly 1 for a longitudinally flushed stroke piston combustion engine and especially to a large-size two-stroke diesel generator moving slowing and flushing longitudinally. The cylinder assembly 1 includes an air cylinder provided with a combustion room 200 and an entrance area 22. A piston 3 moving back and forward long a cylinder axis Z is installed between an upper dead point and a lower dead point in the cylinder 2. And a flushing air entrance 4 is arranged in the cylinder 2 to facilitate to lead the flushing air 4 into the combustion room 200. The cylinder arrangement comprises a piston (3) which is provided as two piece piston. A mantle piston (32) is provided with a piston ring (33), where a main piston (31) is positioned in the mantle piston. A retaining device is provided at a cylinder for the mantle piston. The rinsing air (41) is introduced from an inlet area (22) to a combustion chamber (200) by the rinsing air opening (320) of the mantle piston.

In a method for operating an internal combustion engine having at least one cylinder which includes a first exhaust valve and a second exhaust valve, the internal combustion engine is operated in a scavenging operating mode in that the closing times of the exhaust valves after an ejection stroke of a four-stroke operating cycle are situated after an opening time of an intake valve, and the second exhaust valve is opened with a time delay relative to the first exhaust valve in the scavenging operating mode.