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 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 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 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 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 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.