110 results about "Lean combustion" patented technology

The invention relates to the technical field of engine control, in particular to an engine combustion control method, device and system based on double oil sprayers and a computer program product. Comprising the steps that when an engine enters a lean-burn working condition and meets a self-learning condition, self-learning of the injection starting angle and the excess air coefficient of an auxiliary oil injector is conducted; ignition advance angle self-learning of the auxiliary fuel injector is carried out; and fuel injection control over the auxiliary fuel injector is conducted on the basis of the injection starting angle, the excess air coefficient and the ignition advance angle obtained through self-learning. And when refined fuel oil control is carried out to achieve the optimal fuel consumption of the engine, the lowest NOx emission requirement under the lean-burn working condition of the engine is met.

The invention relates to a cooperative control method and system for lean-burn emission of a marine low-zero carbon fuel engine. The method comprises the steps that real-time in-cylinder pressure and temperature data are collected, and an in-cylinder pressure curve and an in-cylinder temperature curve are obtained through time sequence alignment, filtering denoising and interpolation fitting processing; extracting time sequence data based on the curve, calculating average effective pressure and peak temperature in a cylinder to determine a current load interval, and marking a risk tag sequence; calculating the generation rate of the nitrogen oxides and the particulate matters by matching with reaction condition parameters, and extracting reverse variation characteristics to obtain strong mutual exclusion correlation of the nitrogen oxides and the particulate matters; and based on the associated starting model, predicting and controlling the output oil injection quantity and the air inflow adjusting quantity, calculating the transient time sequence lag quantity through a dynamic lag model, and after superposition, calibrating through a combustion phase matching algorithm to generate an oil injection timing and air inlet valve opening control instruction after transient adjustment. The method is adaptive to the combustion characteristics of low-zero-carbon fuel, emission contradictions are accurately captured, transient emission peak values are avoided, and multi-pollutant collaborative control is achieved.

To perform lean combustion and clean up nitrogen oxides.SOLUTION: An engine has a first three-way catalytic converter connected to a first combustion chamber via a first upstream exhaust pipe, and a second three-way catalytic converter connected to a second combustion chamber via a second upstream exhaust pipe. The engine has a selective catalytic reduction converter connected to the first three-way catalytic converter and the second three-way catalytic converter via a downstream exhaust pipe. A control system provided on the engine controls an air-fuel ratio in the second combustion chamber to a target air-fuel ratio that is equal to or lower than a stoichiometric air-fuel ratio, when controlling an air-fuel ratio in the first combustion chamber to a target air-fuel ratio that is out of a purification window of the first three-way catalytic converter to the lean side.SELECTED DRAWING: Figure 7

The invention discloses a pre-combustion chamber charge adjusting jet flow flame ignition combustion system, and relates to the technical field of internal combustion engines. The ignition device is arranged on an engine cylinder cover and can extend into the main combustion chamber, and a pre-combustion chamber and a charge adjusting valve are arranged on the ignition device; fuel can be fed into the pre-combustion chamber and the main combustion chamber. The injection end of the pre-combustion chamber extends into the main combustion chamber, and the charge regulating valve can be closed along with the increase of gas pressure in the main combustion chamber so as to separate the main combustion chamber from the pre-combustion chamber, and can also be opened under the action of gas pressure generated by combustion in the pre-combustion chamber so as to communicate the main combustion chamber with the pre-combustion chamber; according to the pre-combustion chamber charge adjusting jet flame ignition combustion system, the charge entering the pre-combustion chamber from the main combustion chamber is adjusted, ignition of the pre-combustion chamber is controlled, jet flame energy is improved, lean combustion of fuel and air is achieved in the main combustion chamber, the heat efficiency of an internal combustion engine is further improved, and NOx emission is reduced.

Embodiments of the present application provide a method, device and equipment for correcting engine ignition angle and a storage medium. The method comprises: obtaining an intake amount and an injection amount of the engine; determining an air coefficient of the engine based on the intake amount; judging whether the air coefficient meets a preset condition; and determining an engine fuel amount based on the injection amount and an equivalence ratio of the engine in the case that the air coefficient meets the preset condition. By using the technical solution of the embodiments of the present application, in the case of using lean combustion technology, the engine fuel amount is determined by using the injection amount of the engine and the equivalence ratio of the engine, the effective combustion air amount is obtained, the ignition and injection are controlled, the efficient control of the lean ignition time is realized, and technical support is provided for subsequent engine thermal efficiency improvement.

A method of operating a gas turbine engine. The gas turbine engine includes an accessory gearbox arranged to power one or more engine accessories, and a combustor in which fuel is combusted and a fuel-oil heat exchanger arranged to transfer heat between oil and fuel that is provided to the combustor. An average temperature of lubricating oil is at least 180° C. on exit from the accessory gearbox at cruise conditions. The method includes transferring heat from the oil to the fuel before the fuel enters the combustor so as to raise the fuel temperature to an average of at least 135° C. on entry to the combustor at cruise conditions. Also provided is a gas turbine engine.

The invention provides an oil injection control method of an ignition system, a storage medium and a vehicle, and belongs to the technical field of vehicles. The method comprises the steps that the current working condition type of an engine is determined based on the engine rotating speed and driver demand torque; an oil injection strategy corresponding to the current working condition type is determined; and based on the fuel injection strategy, the first fuel injector and the second fuel injector are controlled to conduct fuel injection operation. According to the embodiment of the invention, the distances among the first fuel injector, the second fuel injector and the sparking plug are reasonably arranged, and meanwhile, according to the current working condition type of the engine, a proper fuel injection strategy is specifically matched to control the first fuel injector and the second fuel injector to carry out fuel injection matching, so that mixed gas can be distributed more reasonably and ignited more easily; no matter what working condition the engine is in, stable ignition of the engine and stable combustion of flames can be achieved, and meanwhile the lean combustion effect is improved.

The application discloses a low-pollution combustion chamber and an aero-engine, wherein the outer ring of a flame tube and the inner ring of the flame tube are provided with mixing holes correspondingly, a combustion cavity forms a quenching mixing area along the axial direction of the combustion cavity corresponding to the space of the mixing holes, and the combustion cavity forms an oil-rich combustion area on one side of the quenching mixing area close to the head of the flame tube and an oil-lean combustion area on the other side of the quenching mixing area away from the head of the flame tube; the outer ring of the flame tube and the inner ring of the flame tube are both bent towards the combustion cavity at the position of the oil-rich combustion area close to the quenching mixing area, so that the combustion cavity forms a contraction cavity body at the quenching mixing area and the oil-lean combustion area. The application adopts a fast contraction profile design for the structure of the flame tube, so as to shorten the radial distance between the mixing holes of the outer ring of the flame tube and the inner ring of the flame tube, improve the mixing jet efficiency, make the gas in the oil-rich combustion area switch to the oil-lean combustion area quickly, realize low-pollution emission of the combustion chamber, and meet the requirement of high-quality temperature distribution at the outlet of the combustion cavity.

The invention relates to the technical field of low-concentration gas engines, and particularly discloses an ignition device of a high-power low-concentration gas engine and a control method, the ignition device comprises a pre-combustion assembly, an ignition module and an electric control regulating valve; the electric control adjusting valve is used for adjusting the air inlet pressure of the pre-combustion assembly and making the pressure difference between the air inlet pressure and the pressure in the engine pressure stabilizing box constant. The pre-combustion assembly comprises an air inlet assembly, a structural body connected with the air inlet assembly and the ignition module, a nozzle matched with the structural body to form a pre-combustion chamber, a spark plug installed in the structural body and a one-way valve connected with the air inlet assembly and the pre-combustion chamber. The concentration of mixed gas in the pre-combustion chamber can be independently organized, stable ignition of the spark plug is facilitated, and lean combustion with the excess air coefficient larger than 1.6 in the main combustion chamber is achieved; the intake pressure of the pre-combustion chamber is adjusted in real time according to the intake pressure of each cylinder of the engine, and the concentration of mixed gas in the pre-combustion chamber is stable.

The application discloses a kind of gas engine active precombustion chamber lean combustion comprehensive system and control method, belong to gas engine technical field.The system includes main combustion gas inlet pipeline, active gas inlet pipeline, active precombustion chamber and ECU.Active gas inlet pipeline is equipped with active gas inlet electric pressure regulating valve, active gas inlet total gas metering valve, each cylinder precombustion chamber entrance is equipped with active gas inlet single cylinder gas metering valve.ECU and gas inlet manifold pressure sensor and electric pressure regulating valve form closed loop pressure regulating unit, maintain the positive pressure difference between precombustion chamber and main combustion chamber;ECU and total metering valve, single cylinder metering valve, single cylinder exhaust temperature sensor form metering control unit, realize total air intake and single cylinder air intake independent closed loop regulation.The application controls precombustion chamber air intake pressure and each cylinder gas quantity accurately, combines the intercylinder balance control based on exhaust temperature, significantly improves the stability and uniformity of multi-cylinder gas engine lean combustion, effectively improves thermal efficiency.

The invention provides an internal combustion engine-steam combined cycle power generation system for chemical waste gas recovery. The problems that in a traditional scheme, available energy is little, and energy quality is low are solved. Based on an internal combustion engine low-temperature combustion technology, heat transfer loss of a combustion chamber is reduced, waste heat energy taken away by cooling liquid is minimum, and the problem that waste heat available energy of an internal combustion engine is small is solved. Based on the ultra-lean combustion technology of the internal combustion engine, the exhaust oxygen content is increased, the exhaust temperature is reduced, and the input boundary of a downstream waste heat boiler is met. Based on the waste heat boiler graded afterburning technology, oxygen-enriched exhaust gas of an upstream internal combustion engine serves as combustion-supporting air and over-fire air of a boiler burner, graded afterburning is implemented, and the energy quality of waste heat of the internal combustion engine is greatly improved. Based on implementation of the three key technologies, the system heat efficiency of the internal combustion engine-steam combined cycle can be remarkably improved, and the energy efficiency level similar to that of the gas turbine-steam combined cycle is achieved.

The present application provides a combustion chamber, a gas turbine engine, and a combustion method of hydrogen-based fuel and air. The combustion chamber for hydrogen-based fuel comprises a first combustion vessel providing a first chamber, a second combustion vessel providing a second chamber, the first combustion vessel being located inside the second chamber and at an upstream section of the second chamber, and a hydrogen-based fuel injection member located inside the first chamber. The first chamber provides a first combustion region, which is a rich combustion region. A region of the second chamber downstream of the first combustion vessel provides a second combustion region, which is a lean combustion region. Low carbon and low pollution emission combustion is achieved.

A combustor for rich-quench-lean combustion includes a combustor shell, a combustion chamber delimited by the combustor shell, and fuel injectors. The combustion chamber includes a primary zone, a quench zone, a secondary zone, and an outlet arranged in axial flow series. Openings through the combustor in the quench zone provide a quench air flow into the quench zone. A method for rich-quench-lean combustion for the combustor includes contemporaneously injecting a rich air-fuel mixture into the primary zone and injecting a second air flow into the quench zone in which the second air flow is equal to or less than four times the primary air flow.

A control method for a hybrid vehicle configured to switch between stoichiometric combustion and lean combustion in which the target air fuel ratio is set to be leaner than the theoretical air fuel ratio is provided. The control method for the hybrid vehicle includes when the combustion mode is switched from the lean combustion to the stoichiometric combustion, stopping a fuel supply to the internal combustion engine; decreasing an intake air amount of the internal combustion engine during the stop; setting the target air fuel ratio of the internal combustion engine to the theoretical air fuel ratio, or the air fuel ratio richer than the theoretical air fuel ratio, in a state in which the intake air amount of the internal combustion engine is decreased; and restarting the internal combustion engine.

A lean-burn engine pressurization control method. An exhaust control valve (170) is provided at a turbine (142) end of a turbocharger (140). The method comprises: acquiring a required intake pressure of an engine (S1); when the required intake pressure is higher than a basic boost pressure, acquiring an actual intake pressure of the engine (S2-S3), the basic boost pressure being a boost pressure of the engine when the exhaust control valve is fully open; and, on the basis of the required intake pressure and the actual intake pressure, controlling the degree of opening of the exhaust control valve (S4). Further provided are a computer device (300), a computer-readable storage medium, a computer program product, a lean-burn engine pressurization control system (100), and a vehicle.

Engine procedure which includes: Operating the engine (8) with lean combustion; and when the exhaust gas oxygen concentration is below a threshold value, injecting air into an exhaust passage (35) between a first exhaust gas purification device (70) and an SCR device (72), wherein - an amount of injected air is further controlled to maintain a temperature of the SCR device (72) within a threshold range, and / or - injecting air into the exhaust passage (35) further comprises directing supercharged intake air directly to the exhaust passage (35).

The invention relates to a lean burn control mode of a spark ignition type diesel engine, and relates to the technical field of engines, the used fuel is diesel oil, and the diesel oil is used as heavy oil, is weak in volatility, easy to store, high in ignition point and safer compared with gasoline, and meets the military use standard; an ignition device is reserved, and aviation kerosene and gasoline can be switched according to actual use conditions; compared with other two-stroke diesel engines, heating and preheating systems are not needed in the starting and working processes, and the fault probability of the whole machine is reduced; compared with a gasoline engine, the heat efficiency is higher, and the fuel consumption rate is lower; compared with a traditional two-stroke engine with the same displacement, the weight of the engine body is equivalent.

The present invention discloses an exhaust gas treatment control method, comprising: detecting and acquiring pre- and post-treatment NOx emission concentrations, and determining a target NOx emission ratio at the inlet of the post-treatment device and a specific NOx emission ratio based on the pre- and post-treatment NOx emission concentrations; determining a combustion mode coefficient request value and an actual combustion mode coefficient value based on the target NOx emission ratio and the specific NOx emission ratio at the inlet of the post-treatment device; determining a final output combustion mode set value based on the request and actual combustion mode coefficient values; determining a combustion mode interpolation, an air-fuel ratio interpolation, a fuel rail pressure interpolation, an injection angle interpolation, and an ignition angle interpolation based on the final output combustion mode set value; and using the air-fuel ratio interpolation, fuel rail pressure interpolation, injection angle interpolation, and ignition angle interpolation to control engine combustion. The present invention fully utilizes the advantages of lean fuel consumption and reduces the emission risks caused by lean combustion.

This utility model discloses a core structure for a high-energy ignition coil used in automobiles, including a core structure installed inside the ignition coil housing. The core structure comprises a magnetic sheet, a primary coil, a secondary coil, and a toroidal core. The magnetic sheet is embedded in the primary coil, which is interference-fitted into the secondary coil. The toroidal core simultaneously surrounds both the primary and secondary coils and is tightly fitted to the magnetic sheet. The end of the primary core furthest from the magnetic sheet is tightly fitted against the toroidal core. The closed magnetic circuit structure of the toroidal core concentrates the magnetic field almost entirely within the core, resulting in minimal magnetic leakage, uniform magnetic field distribution, low magnetic reluctance, and high magnetic flux density. This leads to high energy conversion efficiency, minimal energy loss, and the efficient energy conversion capability enables the ignition coil to generate higher secondary voltage and stronger spark energy. It is suitable for lean-burn and high-performance engines, ensuring reliable ignition and better fuel economy.

The application discloses a lean-burn engine control method, device and engine system. The lean-burn engine control method comprises the following steps: obtaining a current torque and a target torque; when the current torque is less than the target torque, obtaining an average effective pressure and an excess air coefficient; when the average effective pressure is in a first pressure range and the excess air coefficient is in a first coefficient range, adjusting an ignition angle, increasing air content and combustible content in a cylinder, and increasing the current torque to the target torque. By using the above technical scheme, the current torque can be increased, the thermal efficiency can be ensured to be high, and the combustion center can be prevented from changing, the ignition angle can be prevented from being large, and the lean-burn engine can be prevented from being damaged by knocking.

The invention relates to a diesel methanol dual-fuel engine lean-burn system combined with a heat and power combined supply circulating system and an energy comprehensive utilization method, and the diesel methanol dual-fuel engine lean-burn system comprises a pre-combustion chamber, a dual-fuel injector system, a methanol injection system, an exhaust back pressure adjusting system, the heat and power combined supply circulating system and the like. The fuel injection precision control of the engine is realized through a dual-fuel injector system and a methanol injection system, two working modes of a pure diesel oil combustion mode and a dual-fuel combustion mode are realized, and lean combustion of the engine is realized by adopting an exhaust backpressure adjusting system and micro-injection ignition of a pre-combustion chamber. A combined heat and power supply circulating system is adopted to meet the electric energy and heat energy requirements of the system, and meanwhile engine combustion pollutant emission is reduced. And the economical efficiency, the dynamic property and the environmental protection property of the system under the full-working-condition operation condition are improved.

The application discloses a low-pollution center multi-stage combustion chamber inter-stage cooling ring cavity structure, which comprises a cooling ring cavity, the cooling ring cavity is arranged in a swirler, and the swirler is arranged in a low-pollution center multi-stage combustion chamber; an inter-stage cooling air inlet channel is arranged in the cooling ring cavity, an inter-stage ring gap inlet I is arranged at the input end of the inter-stage cooling air inlet channel, an H wall surface, an L wall surface and a P wall surface are arranged on one side of the cooling ring cavity, and the H wall surface, the L wall surface and the P wall surface all refer to a section of wall surface of a sleeve. The structure can make the next step and the main combustion stage swirler gas volume better mixed and combusted, make the main combustion stage combustion area oil-lean combustion more uniform, burn at an equivalence ratio close to an oil-lean extinction boundary, the main combustion area temperature is low, the residence time is short, the NOx emission can be kept at a very low level, and the backfire problem can be avoided as much as possible.

An injection method, for an injection device in a combustion chamber of an aircraft turbine engine, said injection device comprising an internal channel surrounded by an external annular channel, said channels leading into said combustion chamber of the gas turbine, the method including injecting a gaseous hydrogen / air mixture having a greater hydrogen richness level than the stoichiometric amount into said internal channel and injecting air into the external annular channel so as to produce, at the outlet of the internal channel, a first flame front resulting from rich combustion surrounded by a second flame front resulting from lean combustion.

The invention discloses a low NOx combustion system and method based on ammonia decomposition staged combustion, the low NOx combustion system based on ammonia decomposition staged combustion comprises an ammonia storage tank, an ammonia decomposition device, an air source and a combustion device, the combustion device comprises a first-stage combustion area and a second-stage combustion area, an outlet of the ammonia decomposition device is connected with a gas inlet of the first-stage combustion area, and an outlet of the second-stage combustion area is connected with a gas outlet of the second-stage combustion area; an air source is connected with gas inlets of the first-stage combustion area and the second-stage combustion area through an air pump, the first-stage combustion area is a rich combustion area, and the second-stage combustion area is a lean combustion area. By utilizing the system, liquid ammonia is decompressed and then enters the ammonia decomposition device to be decomposed into mixed gas of ammonia gas, hydrogen and nitrogen; the mixed gas and air are mixed into primary air, the primary air enters the first-stage combustion area to be combusted, and the remaining air enters the second-stage combustion area from the secondary air inlet to be combusted. By combining ammonia decomposition and rich-fuel-lean-fuel staged combustion technologies, stable combustion of ammonia is achieved, NOx emission is reduced, and ammonia escape is prevented.

The precombustion chamber device comprises a device body, an injection cavity is formed in the device body, a partition plate is arranged in the injection cavity and divides the injection cavity into a first cavity body and a second cavity body, a first injection hole communicating with the first cavity body and the second cavity body is formed in the partition plate, and a second injection hole communicating with the first cavity body and the second cavity body is formed in the partition plate; the device body is provided with a second spraying hole communicating with the second cavity and leading to the outside of the device body. The sparking plug is arranged on the device main body, the sparking plug is provided with an ignition end used for ignition, and the ignition end of the sparking plug is located in the first cavity; the methanol sprayer is arranged on the device main body, the methanol sprayer is provided with a spraying end for spraying methanol, and the spraying end of the methanol sprayer leads to the first chamber. According to the pre-combustion chamber device, the speed of the formed jet flow can be increased, so that the penetrating power of the jet flow is enhanced, a plurality of ignition points can be stably formed in the main combustion chamber of the methanol engine, and the lean combustion limit can be further expanded.

The present application relates to the technical field of engine, and discloses a matching method of a supercharger for a lean-burn engine and a supercharger for a lean-burn engine, the matching method of the supercharger for the lean-burn engine comprising: obtaining target performance parameters of the engine; obtaining design parameters of the supercharger required by lean-burn combustion and equivalent ratio combustion of the engine under the target performance parameters of the engine; and adjusting and verifying performance parameters of the supercharger required by lean-burn combustion of the engine according to the design parameters of the supercharger required by lean-burn combustion and equivalent ratio combustion of the engine under the target performance parameters of the engine, until the engine can reach the target performance parameters under the performance parameters of the supercharger under lean-burn combustion. The matching method of the supercharger for the lean-burn engine and the supercharger for the lean-burn engine can realize large pressure end flow and small vortex end flow of the supercharger to match the demand of the lean-burn engine under the condition of meeting the design requirements of the supercharger in the early stage.

A method of operating a gas turbine engine having a lean burn staged combustion system having a combustor in which fuel is combusted. The gas turbine engine includes a fuel-oil heat exchanger arranged to transfer heat between oil and fuel that is provided to the combustor. The method includes transferring heat from the oil to the fuel before the fuel enters the combustor so as to lower the fuel viscosity to 0.58 mm2 / s or lower on entry to the combustor at cruise conditions.

The application provides an intake passage multi-point injection spark ignition methanol engine and a vehicle, comprising: an EGR pipeline connected with an intake pipeline and an exhaust pipeline respectively, and the EGR pipeline is arranged on the bypass side of an engine body; the exhaust gas generated by the exhaust pipeline is recycled and supplied to a gas injection system through the EGR pipeline, so that the gas injection system performs multi-point gas injection; the gas injection system is also connected with a methanol supply source, which is used for providing methanol fuel to the gas injection system, and the gas injection system is connected with the engine body and sprays the methanol fuel to the engine body; the opening degree of the intake pipeline and the EGR pipeline is controlled to adjust the intake amount of the engine body, and the methanol injection amount of the gas injection system is controlled to make the spark ignition methanol engine equivalent combustion, lean combustion or rich combustion. The application can improve the combustion and working performance of the methanol engine, reduce the weight of the engine, make the structure of the engine more compact, and improve the power-weight ratio and the power-volume ratio of the engine.

The application provides a compact high-temperature fuel cell jet engine multi-mode split hybrid propulsion system, which is beneficial to solve the problems of low thermal efficiency, high fuel consumption and high nitrogen oxide emission of traditional aviation gas turbine engines. The system comprises a propulsion system, a transmission system and a lubrication system; the propulsion system adopts parallel double shafts; the two connecting shafts can transmit power through the transmission system to realize two working modes of the ducted fan; the lubrication system sends lubricating oil to all shafts on the shaft. The high-temperature solid oxide fuel cell system is used to supply power to the motor through the direct current conversion device, and then the motor drives the ducted fan, so that the total efficiency and total thrust of the hybrid propulsion system are improved. The hydrogen-rich combustion chamber and the hydrogen-lean combustion chamber are added to the structure, so that the problem of fuel preheating of the high-temperature solid oxide fuel cell through the heat exchanger with complex pipelines is solved.

The invention discloses a hydrogen internal combustion engine injection control method based on pre-combustion chamber ignition, which comprises the following steps of: when a piston is positioned in a range of a crankshaft angle of 50-70 degrees before a compression top dead center, starting to inject hydrogen into a pre-combustion chamber; the hydrogen injection duration of the pre-combustion chamber is controlled to be smaller than a 5-degree crankshaft angle, and the equivalence ratio of the pre-combustion chamber during ignition is 0.8-1.2; when the piston is close to an upper dead center, a pre-combustion chamber spark plug is triggered to ignite, so that a pre-combustion chamber flame kernel is formed within a crankshaft angle of 1-5 degrees after ignition; flame of the pre-combustion chamber is sprayed into the main combustion chamber through the jet flow channel, multi-point ignition flame cores are formed in the main combustion chamber, and combustion of mixed gas formed by mixing hydrogen and air is promoted. And when the compression stroke is finished, hydrogen injection of the pre-combustion chamber is stopped, and the total injection duration angle does not exceed the 100-degree crankshaft angle before the lower dead center of the piston. According to the hydrogen internal combustion engine injection control method based on pre-combustion chamber ignition, by optimizing the time, duration and control strategy of pre-combustion chamber fuel injection and cooperating with a corresponding sensing and feedback adjusting mechanism, stable and rapid ignition and flame propagation of hydrogen lean combustion are achieved, and the combustion efficiency is improved. The lean burn limit is widened, NOx emission is reduced, and the heat efficiency of the engine is remarkably improved. The invention further discloses an engine system.