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

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 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 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 belongs to the technical field of engines, and relates to a lean-burn engine and an automobile. The lean-burn engine includes a water spray system and an electronic control unit; the water spray system includes an air passage sprinkler, a pressure sensor and a water supply device, and the air passage sprinkler It is connected to the water supply device through a water pipe, and the pressure sensor is used to detect the pressure value of the water pipe and send it to the electronic control unit. The sprinkler is connected to the pressure sensor signal. When the engine is in different working conditions, the pressure value of the water pipe changes, and the pressure sensor sends corresponding signals to the electronic control unit according to the different pressure values ​​of the water pipe, and the electronic control unit controls the airway sprinkler. Adjust the amount of water spray. In the lean-burn engine of the present application, the electronic control unit controls the airway water injector to adjust the water injection amount according to different engine working conditions (loads), so as to realize efficient and clean combustion of the engine.

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 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.