46results about How to "Wide lean burn limit" patented technology

The invention provides a microwave plasma ignition combustion system of an internal combustion engine. The microwave plasma ignition combustion system comprises a microwave ignition device and a combustion chamber, wherein the microwave ignition device feeds microwave pulse with preset frequency into the combustion chamber; the microwave pulse is used for puncturing and igniting combustible mixed gas in the combustion chamber. The microwave plasma ignition combustion system provided by the invention has the advantages that since the microwave pulse with preset frequency is fed into the combustion chamber, the resonance effect is realized in the combustion chamber, and a strong-current magnetic field is generated, so that the combustible mixed gas in the combustion chamber is punctured and ignited, further the lean burn limit of the engine is expanded, the lean burn capability of the engine is improved and stable lean burning is realized.

The invention relates to the technical field of internal combustion engines, and discloses a natural gas engine, and a combustion system and a combustion method for the natural gas engine. The natural gas engine, the combustion system and the combustion method have the advantages that gas inlets of a part of cylinders of the natural gas engine are connected with natural gas supply equipment on the basis that a cooling EGR (exhaust gas recirculation) technology is applied to the natural gas engine, and excessive natural gas flows into the part of cylinders and is combusted to generate modified mixed gas containing H<2> and CO; exhaust ports of the part of cylinders are connected with a gas collecting cavity, the modified mixed gas is totally led into the gas collecting cavity, and the modified mixed gas and gas in the gas collecting cavity are mixed with each other and then flow into various cylinders to participate in combustion; a large quantity of hydrogen is contained in the gas which is modified by the part of cylinders, and can accelerate combustion of the mixed gas, so that the flammability limit of gas in the cylinders can be upgraded under the condition of a high EGR rate, NO<x> is reduced, the combustion temperature is lowered, knocking can be suppressed, the dynamic property and the economical efficiency of the engine can be improved, and the difficult problem of high heat load of an existing natural gas engine can be solved.

The invention provides a gas jet device of an electric control jet lean-burn natural gas engine and a jet control method. The gas jet device comprises a large flow natural gas nozzle, the nozzle is arranged on a cylinder cover or an air intake manifold, the lower part of the nozzle is provided with a draft tube, the inside diameter of the draft tube is the same as the inside diameter of a nozzle outlet, the center line of the draft tube and the center line of an intake valve are two spatial straight lines which are not mutually parallel or intersected, and post gas pulse in the air intake process passes through an annular gap between the intake valve and a valve seat and is directly sprayed into a cylinder. Through the gas jet control method, mixed gas concentration layers are formed from the top down in the cylinder to ensure reliable combustion of the engine; and the jet pulse is directly sprayed into the cylinder to convert self kinetic energy into turbulent energy in the cylinder so as to quicken the combustion process of the natural gas engine and expand the lean-burn limit of stable running of the engine, thereby improving the dynamic property, economical efficiency and emission performance of the natural gas engine.

The invention relates to the technical field of gasoline engine combustion control methods, and particularly relates to a compression ignition jet ignition combustion system and a combustion control method. In the compression ignition jet ignition combustion system, a manifold oil injector and a direct injection oil injector jointly form a double-injection structure, and a sparking plug does not need to be arranged in the combustion system. An injection opening of the manifold oil injector of the combustion system is connected with an air inlet channel; and a jet chamber is arranged in a maincombustion chamber, an injection opening of the direct injection oil injector is connected with the jet chamber, and the jet chamber is used for enabling fuel oil injected by the direct injection oilinjector to be compressed and ignited to form compression ignition fuel gas and dispersing the compression ignition fuel gas into the main combustion chamber. According to the combustion system, on the basis of an existing engine, complex structure modification is not needed, cost is low, combustion stability is guaranteed, and robustness is high; and compared with a traditional flame jet combustion mode in the prior art, the combustion temperature is lower, nitrogen oxide emission in the engine is reduced, the burden of a lean-burn catalyst is relieved, and time-sharing and partition-controllable spontaneous combustion of the jet chamber and the main combustion chamber is achieved.

The invention discloses a low temperature plasma ignition device for an internal combustion engine. The low temperature plasma ignition device comprises a medium plate in a sheet shape and arranged on the bottom of a combustion chamber of the internal combustion engine, a sensing electrode in a sheet shape and arranged on one side of the medium plate, and a discharging electrode arranged on the other side of the medium plate and electrically connected with a high pressure ignition coil. The invention further discloses an internal combustion engine comprising an air cylinder and any one low temperature plasma ignition device disposed in the air cylinder. The low temperature plasma ignition device can discharge along a dielectric surface and achieve quick and large scale ignition for a gasoline engine; inflammable hybrid gas can quickly burn; energy use and emission can be reduced, so contribution is made to haze elimination; and strong automobile power is provided and an energy-saving emission-reduction novel gasoline engine with advanced combustion technology is created.

The invention belongs to the technical field of engines, and relates to a lean burn engine and an automobile. The lean burn engine comprises a water spraying system and an electric control unit, wherein the water spraying system comprises air flue water sprayers, pressure sensors and a water supply device; the air flue water sprayers are connected with the water supply device through water pipes;the pressure sensors are used for detecting the pressure values of the water pipes and sending the pressure values to the electric control unit; the air flue water sprayers are arranged on air inlet channels of air cylinders of the engine and spray water to the air inlet channels; the electric control unit is in signal connection with the air flue water sprayers and the pressure sensors; and whenthe engine is in different work conditions, the pressure values of the water pipes change, the pressure sensors send corresponding signals to the electric control unit according to the different pressure values of the water pipes, and the electric control unit controls the air flue water sprayers to adjust the water spraying amount. According to the lean burn engine, the electric control unit controls the air flue water sprayers to adjust the water spraying amount according to different engine work conditions (loads), and efficient clean combustion of the engine is achieved.

The invention discloses a natural gas engine. The natural gas engine comprises an air cylinder, an air cylinder cover, a flame ejector module, a natural gas main path and a natural gas branch path, wherein the flame ejector module is arranged between a gas inlet valve and a gas outlet valve of the air cylinder cover and comprises an ejector body and an ejector head, a sparking plug is mounted inside the ejector body, the side wall of the ejector body is provided with a gas inlet, the ejector head is of a hollow cavity structure, the cavity is a combustion chamber of the ejector and communicated with the gas inlet, and the ejector head is provided with a flame ejection nozzle and extends into the combustion chamber of the air cylinder; the natural gas main path mixes natural gas and fresh air into thin mixed gas and is in butt joint with the combustion chamber of the air cylinder, and the gas inlet valve controls the inlet of the thin mixed gas; the natural gas branch path is in butt joint with the combustion chamber of the ejector and conveys pure natural gas into the combustion chamber of the ejector; the sparking plug ignites the pure natural gas inside the combustion chamber of the ejector timely, flame inside the combustion chamber can be ejected from the flame ejection nozzle to ignite the thin mixed gas inside the combustion chamber of the air cylinder and further drive the piston inside the air cylinder to work. The natural gas engine can achieve rapid and stable thin mixed gas combustion through relatively low ignition energy.

The invention discloses a working method of an igniter with a double air inlet eccentric double anode structure. The method specifically includes the following steps that during work, a certain amountof air or fuel is introduced through an air inlet a; meanwhile, firstly, a power supply supplies power to a short anode and a long anode at low voltage; at the lower voltage, dielectric barrier discharging happens between the short anode and an anode insulating positioning sleeve, between the anode insulating positioning sleeve and a grounded electrode, and between the long anode and the anode insulating positioning sleeve separately; the power supply supplies power to the long anode at higher voltage, under action of the higher voltage, arc discharging happens between the grounded electrodeand the long anode, and when the long anode is energized at the higher voltage, air is introduced into an air channel in the long anode. By means of the working method of the igniter with the double air inlet eccentric double anode structure, the advantages of nonequilibrium plasma of a wide lean burn limit and high reaction activity and the advantages of thermal equilibrium plasma of high workingair pressure and the like are combined, so that the purpose of achieving high-energy stable ignition in a wide fuel air ratio range is achieved.

The invention relates to the internal-combustion engine technical field, in particular to a low-temperature combustion method of an internal-combustion engine with fuel reformation inside cylinders and system. High-cetane-number fuel is sprayed inside a rich burn air cylinder of a multi-cylinder engine to ignite rich burn combination gas of natural gas and air with a fuel-air equivalence ratio of 1.5-4.0, reformation combination gas which is rich in H2 and CO is generated after the natural gas is rich burned, and then after the reformation combination gas and the air are mixed to enter a lean burn air cylinder for combustion again, a lean burn mode of which the high-cetane-number fuel ignites the reformation combination gas is in the lean burn air cylinder, and a fuel-air equivalence ratio is less than 1. The low-temperature combustion method of the internal-combustion engine with the fuel reformation inside the cylinders and system has the advantages that compared with an existing ignition type natural gas engine, heat efficiency is increased by 30%, and the level of a diesel engine is achieved; emission can achieve an Euro 5 emission standard; use and production cost of the engine is greatly lower than the diesel engine in the same emission standard; and knocking is restrained and NOx is reduced in the process of heavy load, HC and CO emission is reduced in the process of small load, and meanwhile quantity of the required ignition high-cetane-number fuel is small.

The invention discloses a double-discharge plasma igniter with hollow ventilation anodes. The double-discharge plasma igniter with the hollow ventilation anodes comprises an upper anode, a lower anode, an upper grounding electrode, a lower grounding electrode, an anode insulating sleeve and a grounding electrode insulating sleeve, wherein the upper grounding electrode and the lower grounding electrode are connected; the anode insulating sleeve is arranged inside the upper grounding electrode; the upper anode is embedded into the wall of the anode insulating sleeve; the lower anode is composedof a body section a and a body section b, the body section a is arranged inside the mounting hole of the anode insulating sleeve, and the body section b is mounted inside the lower grounding electrode; the connecting part between the lower grounding electrode and the upper grounding electrode is provided with a groove, which is formed in the inner wall of the lower grounding electrode; the grounding electrode insulating sleeve is mounted inside the groove. The double-discharge plasma igniter with the hollow ventilation anodes can combines the advantages of wide lean combustion limit and high reaction activity of non-equilibrium plasmas and the advantages of high working air pressure and the like of thermal equilibrium plasmas to achieve the aim of high-energy and stable ignition within a wide fuel-air ratio range.

The invention discloses an ignition method of a double-discharge mode plasma igniter with a multi-anode structure, and belongs to the field of power, and aims to solve the problem that an existing ignition plug / igniter can be applied to a large-space combustion chamber engine. A long anode and a grounding electrode are insulated by an anode insulation positioning sleeve, so that dielectric barrierdischarge is generated, arc discharge is generated between the grounding electrode and the long anode, a short-anode annular hole and a long-anode open hole are formed in a positioning ring of the insulation positioning sleeve, the lower portion of the short-anode annular hole forms a short-annular groove of a downward closed containing short anode by the aid of an insulation material, space between the long anode and the short-annular groove is hollow, a diameter value of a first diameter value maintenance section is small, a diameter value of a diameter value maintenance section is slightlylarge, so that the space between the inner wall of the grounding electrode and the outer wall of the short-annular groove is hollow, and the hollow and the hollow between the long anode and the short-annular groove sever as first ionization space. By the aid of a dielectric barrier discharge-arc discharge combined discharge mode, lean burn limit of non-equilibrium plasma can be widened, and reaction activity is high.

The invention relates to the technical field of internal combustion engines, and discloses a natural gas engine, and a combustion system and a combustion method for the natural gas engine. The natural gas engine, the combustion system and the combustion method have the advantages that gas inlets of a part of cylinders of the natural gas engine are connected with natural gas supply equipment on the basis that a cooling EGR (exhaust gas recirculation) technology is applied to the natural gas engine, and excessive natural gas flows into the part of cylinders and is combusted to generate modified mixed gas containing H<2> and CO; exhaust ports of the part of cylinders are connected with a gas collecting cavity, the modified mixed gas is totally led into the gas collecting cavity, and the modified mixed gas and gas in the gas collecting cavity are mixed with each other and then flow into various cylinders to participate in combustion; a large quantity of hydrogen is contained in the gas which is modified by the part of cylinders, and can accelerate combustion of the mixed gas, so that the flammability limit of gas in the cylinders can be upgraded under the condition of a high EGR rate, NO<x> is reduced, the combustion temperature is lowered, knocking can be suppressed, the dynamic property and the economical efficiency of the engine can be improved, and the difficult problem of high heat load of an existing natural gas engine can be solved.

The invention discloses a use method of a plasma igniter with an air channel and a fuel channel. The use method particularly includes the steps: leading in a certain quantity of air or fuels from an air inlet a in operation; supplying power for an upper anode by a power supply at low voltage, and not powering on a lower anode; performing dielectric barrier discharge among an upper grounding electrode, an anode insulating sleeve and the upper anode at low voltage, and ionizing the air or fuels positioned in an ionization space a under the action of an external electric field to generate free electrons and non-equilibrium plasma with positive charge positive ions. Owing to continuous leading-in of the air or fuels, the non-equilibrium plasma generated by ionization continues moving downwards, passes an isolation area and enters an ionization space b. The use method can combine the advantages of wide lean burn limit and high reaction activity of the non-equilibrium plasma, high working pressure of thermal equilibrium plasma and the like, and high-energy and stable ignition can be realized within a wide fuel air ratio range.

The invention relates to a gasoline engine ignition mechanism comprising a supersonic jet orifice pre-combustion chamber. The ignition mechanism comprises a cylindrical connecting piece, an oil sprayer mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a spark plug mounting hole penetrating through the connecting piece, a pre-combustion chamber connected with the peripheral face of the connecting piece, a pre-combustion chamber oil sprayer matched with the oil sprayer mounting hole and a pre-combustion chamber spark plug matched with the spark plug mounting hole, wherein the pre-combustion chamber is formed by combining three sections, namely a first cylindrical sleeve body, a conical sleeve body and a second cylindrical cavity body from top to bottom in sequence, N uniformly distributed spray holes are formed in the lower part of the second cylindrical cavity body, and N is greater than or equal to 3; at least one of the spray holes is an over-expansion supersonic jet flow spray hole, and jet flow of the supersonic jet holes not only can shorten ignition delay, but also can prolong the lean combustion limit of a mixture in the main combustion chamber.

The invention relates to the internal-combustion engine technical field, in particular to a low-temperature combustion method of an internal-combustion engine with fuel reformation inside cylinders and system. High-cetane-number fuel is sprayed inside a rich burn air cylinder of a multi-cylinder engine to ignite rich burn combination gas of natural gas and air with a fuel-air equivalence ratio of 1.5-4.0, reformation combination gas which is rich in H2 and CO is generated after the natural gas is rich burned, and then after the reformation combination gas and the air are mixed to enter a lean burn air cylinder for combustion again, a lean burn mode of which the high-cetane-number fuel ignites the reformation combination gas is in the lean burn air cylinder, and a fuel-air equivalence ratio is less than 1. The low-temperature combustion method of the internal-combustion engine with the fuel reformation inside the cylinders and system has the advantages that compared with an existing ignition type natural gas engine, heat efficiency is increased by 30%, and the level of a diesel engine is achieved; emission can achieve an Euro 5 emission standard; use and production cost of the engine is greatly lower than the diesel engine in the same emission standard; and knocking is restrained and NOx is reduced in the process of heavy load, HC and CO emission is reduced in the process of small load, and meanwhile quantity of the required ignition high-cetane-number fuel is small.

The invention provides a gas jet device of an electric control jet lean-burn natural gas engine and a jet control method. The gas jet device comprises a large flow natural gas nozzle, the nozzle is arranged on a cylinder cover or an air intake manifold, the lower part of the nozzle is provided with a draft tube, the inside diameter of the draft tube is the same as the inside diameter of a nozzle outlet, the center line of the draft tube and the center line of an intake valve are two spatial straight lines which are not mutually parallel or intersected, and post gas pulse in the air intake process passes through an annular gap between the intake valve and a valve seat and is directly sprayed into a cylinder. Through the gas jet control method, mixed gas concentration layers are formed fromthe top down in the cylinder to ensure reliable combustion of the engine; and the jet pulse is directly sprayed into the cylinder to convert self kinetic energy into turbulent energy in the cylinder so as to quicken the combustion process of the natural gas engine and expand the lean-burn limit of stable running of the engine, thereby improving the dynamic property, economical efficiency and emission performance of the natural gas engine.

The invention discloses a double-discharge mode plasma igniter with an eccentric double-anode structure, belongs to the field of power and aims to realize dielectric barrier discharge and arc discharge and spatially take compactness into consideration. The double-discharge mode plasma igniter comprises a shell, a long anode, a short anode, an anode insulation positioning sleeve and grounding electrodes, the grounding electrodes are mounted in the shell and connected in a surrounding manner to form a recessed hollow column, the diameter of the hollow column is gradually decreased from top to bottom, the hollow column is divided into two portions, the upper portion and the lower portion are connected to form a horizontal ring wall by the aid of the grounding electrodes owing to rapid decrease of the diameters of the upper portion and the lower portion, the diameter of the lower portion is decreased as the horizontal width of the grounding electrode in a short slot is increased, the horizontal widths of the grounding electrodes on insulation side walls are basically the same, compactness is spatially taken into consideration, two types of discharge can be realized, the internal structure of the igniter is necessarily eccentric, and then the igniter can simultaneously achieve two effects.

The invention discloses a plasma ignitor with an air outlet inclined hole and multi-anode structure. The plasma ignitor comprises a short anode, a long anode and an anode insulation positioning sleevewhich are located in a grounding electrode; an air inlet a inclined downwards is formed in one end of the upper portion of the grounding electrode, an air inlet b inclined downwards is formed in theother end of the upper portion of the grounding electrode, and the air inlet a, the air inlet b and an ionization space a are communicated; a plurality of air inlet inclined holes which are formed circumferentially and inclined downwards are formed in the lower end of the long anode. Due to the fact that fuel and air for ignition are introduced through the air inlet, no back flow of mixed gas inside a main combustion chamber is needed, the equivalent ratio of mixed gas in the ionization space a and the ionization space b can be controlled by adopting a method for controlling fuel flow throughthe air inlet b and air through the air inlet a according to the ignition condition, and the purpose of improving the ionization and ignition effect according to the actual working condition is achieved.

The invention relates to a plasma combustion-supporting exciter with dual working modes of combustion supporting and ignition, and belongs to the field of engines. The plasma combustion-supporting exciter includes a central anode, a grounding electrode, a ring-like anode and an insulating locating sleeve, the insulating locating sleeve is provided with a through hole for installing the center anode and a ring-like groove for installing the ring-like anode, the upper end of the insulating locating sleeve is provided with a mounting platform extending outwards, the upper end of the grounding electrode is provided with a mounting groove connected with the mounting platform in a matched mode, and the insulating locating sleeve is located inside the grounding electrode. According to the structure of the plasma combustion-supporting exciter with the dual working modes of combustion supporting and ignition, a combination discharge mode of dielectric barrier discharge-arc discharge is realized, the advantages of wide thin-burning limit of the non-equilibrium plasma, high reactivity, high working pressure of thermal equilibrium plasma and the like can be combined together, and the purposesof high energy and stable ignition are realized within a wide range of fuel air ratios.

The invention discloses a lean-burn natural gas engine combustion system based on an annular electrode and a control method. The control method comprises the steps of enabling the working condition of an engine to change during a running process; regulating the opening of a throttle valve by an ECU (Electronic Control Unit) according to a feedback value of a revolution speed sensor so as to stabilize the revolution speed; controlling the natural gas injection amount of a natural gas injection module by the ECU according to a MAP which is calibrated in advance, and regulating according to a feedback value of an exhaust gas oxygen sensor; controlling the voltage and the frequency of an alternating current power supply through an alternating current power supply control module by the ECU according to the MAP which is calibrated in advance; accurately controlling the voltage and the frequency of an electric field power supply through the alternating current control module by the ECU according the air inlet temperature and excess air coefficients fed back by a pressure sensor, the revolution sensor and the exhaust gas oxygen sensor. According to the lean-burn natural gas engine combustion system and the control method, disclosed by the invention, the lean-burn limit of a natural gas engine can be expanded, the flame propagation speed is increased, the efficiency of the engine is increased, and the emission is reduced.

The invention discloses an application method of a plasma igniter with a gradually-expanded grounding electrode outlet structure. The application method specifically comprises that a power source firstly supplies a ring-shaped anode at low voltage but not powers a central electrode; at low voltage, dielectric barrier discharge can take place between the ring-shaped anode and an insulating positioning sleeve as well as between the insulating positioning sleeve and a grounding electrode; air and fuel which are continuously inlet via an air inlet a and an air inlet b respectively can form a downward cyclone inside an ionization space a, non-equilibrium plasmas flow via a reducing acceleration section into an ionization space b, and then the air inlet a and the air inlet b are closed; the ring-shaped anode is powered off, then the power source powers the central anode at high voltage; under the action of high voltage, arc discharge takes place between the grounding electrode and the central anode; meanwhile, air is inlet into the cooling air channel inside the central anode without being involved in ionization reaction and is used for cooling down the electrode and disturbing a flow field outside a jet nozzle to improve combustion.

The invention discloses an ignition method for a double-discharge mode plasma igniter with an eccentric double-anode structure, which belongs to the power field. In order to realize dielectric barrierdischarge and arc discharge, a short anode and a long anode are powered separately by a power supply, the ignition is started, the power supply provides power at low voltage to enable dielectric barrier discharge to happen between the short anode and a grounding electrode through isolation, the long anode and the grounding electrode are isolated by an anode insulating positioning sleeve to enabledielectric barrier discharge to happen, unbalanced plasma is generated in first ionization space, the dielectric barrier discharge generates flow field disturbance and heating on gases, the already-ionized gases move downwardly to second ionization space, the voltage of the power supply rises and the power supply only provides power for the long anode, arc discharge thus happens between the grounding electrode and the long anode, ignition and a combustion reaction happen rapidly to the mixed gases located in the second ionization space, the compactness in space is considered, two kinds of discharge are realized necessarily, and in order to have both effects, the internal structure needs to be eccentric.

The invention discloses a double-discharge-mode plasma igniter with a multi-anode structure, and belongs to the field of power. In order to achieve the effect that an existing spark plug / igniter canbe applied to a large-space combustion chamber engine, an insulation positioning sleeve comprises a positioning ring which can be buckled with an annular wall for positioning, the positioning ring isprovided with a short anode annular hole and a long anode open hole, moreover, a short annular groove which seals downwards and contains short anodes is formed below the short anode annular hole by using an insulating material, the multiple short anodes are limited in the short annular groove, the multiple short anodes are separated through an insulating medium, the short annular groove extends into a first diameter value maintaining section at the lower portion, a long anode penetrates out of a long anode open hole and extends to an outlet section, the short annular groove surrounds the longanode, and a hollow portion is formed between the long anode and the short annular groove. The effect that by adopting an dielectric barrier discharge-arc discharge combined discharge mode, the advantages of imbalanced plasma for wide lean-burn limit and large reaction activity can be combined is achieved.

The invention discloses an igniter with a double-inlet eccentric double-anode structure. The igniter with the double-inlet eccentric double-anode structure comprises a short anode, a long anode, an anode insulating positioning sleeve, a grounding electrode, an air inlet a, an air inlet b and air inlet inclined holes. An ionization space a is formed between the anode insulating positioning sleeve and the grounding electrode, and an ionization space b is formed between the lower end part of the long anode and the grounding electrode; the inclined downward air inlet a is formed in one end of theupper part of the grounding electrode, the inclined downward air inlet b is formed in the lower part of the grounding electrode, the air inlet a is placed at the top of the ionization space a, and theair inlet b is placed at the top of the ionization space b; and the multiple air inlet inclined holes which are arranged in the week direction and incline downwards are formed in the lower end of thelong anode. According to the igniter with the double-inlet eccentric double-anode structure, air (or fuel) injected from the air inlet b and air injected from the lower anode cool the anodes and canprolong the service life of an electrode.

The invention provides a gas / dual-fuel engine fuel gas echelon spraying device, which comprises an air cylinder cover and an air cylinder main body, wherein a manifold pipeline is arranged on the air cylinder cover; a high-flow-rate fuel gas spray nozzle is also arranged on the manifold pipeline and comprises a spray nozzle upper half section and a spray nozzle lower half section fixedly connected with the spray nozzle upper half section; the spray nozzle lower half section is a bent pipe; in addition, the tail end of the spray nozzle lower half section is provided with a lower half section air outlet hole; upper half section air outlet holes are formed in the outer surface of the spray nozzle upper half section; the upper half section air outlet holes are arranged in a way that at least two lines of air outlet hole groups are arranged along the length direction of the upper half section spray nozzle, each line of air outlet hole group at least comprises four upper half section air outlet holes, in addition, each line of upper half section air outlet holes are uniformly distributed along the circumferential direction of the upper half section spray nozzle, and the hole diameter of each upper half section air outlet hole is smaller than the hole diameter of the lower half section air outlet holes. The gas / dual-fuel engine fuel gas echelon spraying device has the advantages that the mixing and layering requirements of the fuel gas and the air can be met, the engine combustion process is optimized, and the economic performance and the emission performance are improved.

The invention discloses a high-power precombustion-chamber lean-combustion natural gas engine combustion system based on ozone combustion-supporting and a method. The system comprises a natural gas pipeline, a buffer tank, a Venturi mixer, a pressurizer, an intercooler, an ozone generator and a precombustion-chamber gas inlet one-way valve. Natural gas and air are mixed in the Venturi mixer and then transmitted to the pressurizer, the mixture is pressurized through a gas compressor of the pressurizer and then enters the intercooler, the mixed gas of the natural gas and the air is cooled through the intercooler and then transmitted to a main combustion chamber in one way and to the ozone generator in another way, the ozone generator generates natural gas, air and ozone mixed gas which is sprayed into a precombustion chamber through a mixed gas spraying module, an electronic control unit (ECU) controls a precombustion-chamber ignition system to ignite the indoor natural gas, air and ozone mixed gas for precombustion, and waste gas generated after combustion is transmitted to a turbine of the pressurizer through an exhaust manifold, subjected to working through the turbine of the pressurizer and then discharged out of an engine, so that the combustion and emission performance of the high-power lean-combustion natural gas engine is improved, and the lean-combustion limit is widened.

The invention discloses a plasma igniter with inclined air inlet holes and an eccentric double-anode structure. The plasma igniter with the inclined air inlet holes and the eccentric double-anode structure comprises a short anode, a long anode, an anode insulating positioning sleeve, a grounding electrode, an air inlet a, an air inlet b and the inclined air inlet holes; one end of the upper portion of the grounding electrode is provided with the air inlet a inclined downwards; the air inlet b inclined downwards is formed at the other end of the upper portion of the grounding electrode; the airinlet a and the air inlet b are communicated with an ionization space a; the lower end of the long anode is provided with a plurality of the inclined air inlet holes, which are circumferentially formed and inclined downwards and are used for inletting a small amount of high-activity air formed inside an ionization space b into an air channel. By inletting the small amount of air into the lower anode in a hollow structure, the plasma igniter with the inclined air inlet holes and the eccentric double-anode structure can achieve the effects of cooling down the electrode and disturbing the flowfield of a jet nozzle to improve combustion.

The invention belongs to the technical field of internal combustion engines, and particularly relates to a variable EGR air intake system of a compound injection dual-fuel internal combustion engine and a control method. Based on torque requirements under working conditions with different loads and the purpose of achieving the maximum EGR rate, the invention discloses the variable EGR air intake system and the control method. According to the system, the EGR distribution states can be quickly switched; when in middle and small loads, homogeneous EGR distribution is achieved in an internal combustion engine cylinder; when in high loads, layered EGR distribution is achieved in the internal combustion engine cylinder; a venturi tube and an airflow pressure stabilization cavity are mounted on an EGR air intake introduction pipeline, so that the negative pressure in the pipeline can be conveniently controlled, the EGR tolerance is further improved, the exhaust gas pressure in the pipeline is maintained stable, and the airflow disturbance is reduced; the NOx emission can be effectively reduced, the requirements of loads for EGR distribution form and size are met, the internal combustion engine thermal efficiency can be improved, the fuel consumption rate is decreased, the fuel economy and emission performance of the internal combustion engine are effectively improved, and the large EGR rate is practicable.

The invention relates to the technical field of gasoline engine combustion control methods, and particularly relates to a compression ignition jet ignition combustion system and a combustion control method. In the compression ignition jet ignition combustion system, a manifold oil injector and a direct injection oil injector jointly form a double-injection structure, and a sparking plug does not need to be arranged in the combustion system. An injection opening of the manifold oil injector of the combustion system is connected with an air inlet channel; and a jet chamber is arranged in a maincombustion chamber, an injection opening of the direct injection oil injector is connected with the jet chamber, and the jet chamber is used for enabling fuel oil injected by the direct injection oilinjector to be compressed and ignited to form compression ignition fuel gas and dispersing the compression ignition fuel gas into the main combustion chamber. According to the combustion system, on the basis of an existing engine, complex structure modification is not needed, cost is low, combustion stability is guaranteed, and robustness is high; and compared with a traditional flame jet combustion mode in the prior art, the combustion temperature is lower, nitrogen oxide emission in the engine is reduced, the burden of a lean-burn catalyst is relieved, and time-sharing and partition-controllable spontaneous combustion of the jet chamber and the main combustion chamber is achieved.