17 results about "Combustion phasing" patented technology

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.

The invention discloses a cooperative control method for the air-fuel ratio, the injection opportunity and the cooling liquid temperature of a hydrogen fuel engine. The cooperative control method comprises the steps that S1, operation condition parameters and combustion state parameters of the hydrogen fuel engine are monitored; s2, based on the operation condition parameters, adaptively determining a target air-fuel ratio, a fuel injection opportunity and a cooling liquid temperature through a preset control strategy; s3, the combustion state and the engine operation condition are evaluated in real time through a closed-loop feedback control system, and the following cooperative adjustment is executed: the hydrogen supply amount is adjusted to maintain the target air-fuel ratio; the hydrogen injection time is adjusted, and the combustion phase is optimized. According to the cooperative control method for the air-fuel ratio, the injection opportunity and the cooling liquid temperature in the hydrogen fuel engine, the target air-fuel ratio, the hydrogen fuel injection opportunity and the engine cooling liquid temperature are comprehensively adjusted under a closed-loop feedback control framework, optimal control over the combustion process under different working conditions is achieved, and therefore the braking heat efficiency of the engine is improved, and the service life of the engine is prolonged. And pollutant emission is reduced, knocking is restrained, and the application requirement for efficient cleaning of the engine is met.

This invention discloses a low-emission combustion system and method for an ammonia engine with active control of dual reactive activity, comprising: an ammonia fuel engine and an electronic control unit. A jet ignition device and a liquid ammonia injector are disposed on the cylinder head of the ammonia fuel engine. The jet ignition device provides a jet ignition source to the main combustion chamber, and the liquid ammonia injector injects liquid ammonia fuel into the main combustion chamber. The electronic control unit is connected to the liquid ammonia injector, an air injector, a fuel injector, and a spark plug in the pre-combustion chamber, and is used to adjust the injection timing, number of injections, and injection quantity of the liquid ammonia injector based on at least one parameter among engine speed, load, cylinder pressure, intake state, and combustion phase, while simultaneously adjusting the air injection quantity, hydrogen injection quantity, and pre-combustion chamber ignition timing. The system actively controls the reactive activity within the combustion chamber through multiple injections of liquid ammonia, and simultaneously, through a control strategy, actively controls the combustion rate over a wide range.

An engine (11) includes pistons (71), cylinders, at least one fuel injector (61), spark plugs (239), and piston cooling jets (91). The engine (11) includes an Electronic Control Unit (232) configured to receive an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The Electronic Control Unit (232) is configured to determine a non-firing piston temperature, coolant temperature and combustion phase modifier, and firing piston temperature. The Electronic Control Unit (232) outputs a predicted piston temperature. A method includes housing pistons (71) in cylinders, supplying air, injecting fuel, combusting an air-fuel mixture, spraying engine oil, and receiving an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The method includes determining a non-firing piston temperature, coolant temperature modifier, combustion phase modifier, firing piston temperature, outputting a predicted piston temperature, and coordinating operations of the fuel injectors (61) and spark plugs (239).

The invention relates to the technical field of combustion control of internal combustion engines, and discloses a methanol-diesel dual-fuel combustion method and device.The methanol-diesel dual-fuel combustion method comprises the three stages of methanol main injection in the gas inlet stage, methanol supplementary injection in the final compression stage and diesel micro-ignition, and the fuel evaporation quality is improved through a methanol heater; and a combustion center angle CA50 is calculated in real time based on a cylinder pressure signal, and self-adaptive correction is performed on reinjection timing by using a PI control algorithm, so that closed-loop stable control of a combustion phase is realized. According to the methanol-diesel dual-fuel engine, the uniformity of mixed gas can be remarkably improved, combustion fluctuation is inhibited, the methanol substitution ratio is increased, the fault safety switching function is achieved, and the methanol-diesel dual-fuel engine is suitable for efficient and clean operation of medium-high load methanol-diesel dual-fuel engines.

A heating system 2 is provided, comprising a combustion region 4 for burning fuel, a flue 8 extending from the combustion region, temperature sensors 14, 16 configured to measure the temperature in the combustion region or the flue, and a processing device 18. The processing device is configured to receive temperature measurements from the temperature sensors, generate a temperature-time profile, determine information about a plurality of different combustion phases using the temperature-time profile, and determine output data for the heating system using the information about the plurality of different combustion phases.

A heating system (2) includes a combustion zone (4) for combusting a fuel, a flue (8) extending from the combustion zone, a temperature sensor (14, 16) for measuring a temperature in the combustion zone or the flue, and a processing device (18). A processing device is configured to receive the temperature measurements from the temperature sensor, generate a temperature-time profile, determine information relating to a plurality of different combustion phases using the temperature-time profile, and determine output data relating to the heating device using the information relating to a plurality of different combustion phases.

The invention provides a diesel engine inter-cylinder combustion deviation control method and system and a diesel engine, and the method comprises the steps that a mirror symmetry air inlet system is constructed, and computational fluid dynamics simulation optimization is conducted on the air inlet system, so that the air inflow deviation of each cylinder is smaller than a preset threshold value; performing exhaust gas recirculation gas distribution uniformity simulation on the basis of the optimized gas inlet system, and if the distribution difference value is not smaller than the preset threshold value, adjusting arrangement position parameters of an EGR pipeline in the gas inlet system to obtain an exhaust gas optimized gas inlet system; controlling the compression ratio of each cylinder within the range of a target value based on the manufacturing and assembling tolerance of the exhaust gas optimized air inlet system; calculating the theoretical oil injection quantity of each cylinder according to each cylinder with the compression ratio controlled within the target value range, and selecting a median flow oil nozzle based on the theoretical oil injection quantity to ensure that the oil injection quantity deviation of the oil injectors of each cylinder under the same injection pressure is smaller than a third preset threshold value; the combustion phases of the cylinders are synchronous, and the combustion process is more sufficient.

An estimation method for determining the oxygen storage capacity of a first catalytic converter, which is arranged upstream of a second catalytic converter along an exhaust duct of an internal combustion engine. The estimation method provides for the steps of: carrying out an initial combustion phase, in which the combustion takes place with a lean air-fuel mixture at least until a first oxygen probe arranged downstream of the second catalytic converter signals a switch to a lean air-fuel mixture; carrying out an intermediate combustion phase immediately following the initial combustion phase and in which the combustion takes place with a rich air-fuel mixture at least until a second oxygen probe arranged downstream of the first catalytic converter signals a rich air-fuel mixture; and carrying out a final combustion phase immediately following the intermediate combustion phase and in which the combustion takes place with a lean air-fuel mixture after the second oxygen probe signals a rich air-fuel mixture and at least until the second oxygen probe signals a lean air-fuel mixture.

The invention relates to the field of diesel engine combustion control, and discloses a neural network prediction and torque reconstruction fusion-based cylinder pressure estimation algorithm, which comprises the following steps of S1, acquiring a crankshaft rotating speed, cylinder vibration, an oil injection parameter, an exhaust temperature and an instantaneous torque signal; s2, carrying out wavelet denoising and combustion phase alignment preprocessing; s3, predicting the cylinder pressure by adopting a one-dimensional convolution and long-short term memory network hybrid model; s4, according to the crankshaft kinetic model, cylinder pressure is reversely pushed based on the instantaneous torque; s5, predicting and reconstructing the cylinder pressure by dynamically fusing the neural network, and generating final estimation; and S6, the fuel injection quantity and the EGR rate are adjusted according to the estimation result, and the combustion process is optimized. According to the method, the mode of multi-source signal acquisition and neural network end-to-end modeling is introduced, accurate prediction of the cylinder pressure curve of the engine is effectively achieved, and the problem that prediction is not accurate under the conditions of variable loads and variable rotating speeds in an existing method is solved.

The electronic control device of the present application calculates the rotational speed or rotation time of a certain angle of the crankshaft based on the change in the detection signal of the sensor of the crankshaft. When the combustion cylinder is switched, the information of the rotational speed or rotation time of at least 2 combustion cycles is obtained, and the combustion phase is calculated based on the rotational speed or rotation time. Thus, the combustion state of the internal combustion engine can be detected with high precision using the sensor that measures the rotation of the crankshaft.

An engine includes pistons, cylinders, at least one fuel injector, spark plugs, and piston cooling jets. The engine includes an Electronic Control Unit configured to receive an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The Electronic Control Unit is configured to determine a non-firing piston temperature, coolant temperature and combustion phase modifier, and firing piston temperature. The Electronic Control Unit outputs a predicted piston temperature. A method includes housing pistons in cylinders, supplying air, injecting fuel, combusting an air-fuel mixture, spraying engine oil, and receiving an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The method includes determining a non-firing piston temperature, coolant temperature modifier, combustion phase modifier, firing piston temperature, outputting a predicted piston temperature, and coordinating operations of the fuel injectors and spark plugs.

The application discloses a kind of combustion optimization control system and method for dual-fuel micro-injection engine, it is related to dual-fuel engine technical field, including working condition monitoring module, pilot oil compensation control module and fuel execution module, the pilot oil compensation control module is used for based on real-time working condition dynamic correction pilot oil injection parameter, the pilot oil compensation control module includes: injection parameter prediction unit, compensation amount calculation unit and injection correction unit.The application is installed with pilot oil compensation control module, adopts support vector machine model to predict reference parameter and dynamically compensate adaptive controller combination, realize millisecond level pilot oil injection correction, in fuel-gas mode switching process, combustion phase offset amount is controlled within ±0.8°CA, and speed fluctuation rate is reduced to below 5%, effectively eliminates torque mutation and the risk of flameout.

The invention discloses a cooperative self-adaptive control method and device for parameters, dilution degree and combustion phase of a pre-combustion chamber. The method comprises the following steps: establishing a parameterized pre-combustion chamber structure set K, defining a working condition state vector and a controllable variable, setting constraints including a combustion phase CA50 window, a combustion duration CA10-90 threshold, cyclic variation COVIMEP and an emission threshold, and constructing an efficiency / stability / emission multi-target cost function; the structural layer selects a structural index k * which meets the constraint and has the minimum cost within K, and the control layer solves the optimal control quantity u * under the k * and enables target output to enter a set window through stacking control of CA50 closed loop + CA10-90 limitation; cA50, CA10-90 and COVIMEP are calculated on line based on the cylinder pressure signals, and parameter online identification and rolling optimization are carried out; when COVIMEP, UHC / NOx or CA10-90 is close to a threshold value, rapid switching between structural layer reevaluation and an equivalent structure composed of a replaceable orifice plate / nozzle assembly / adjustable taper angle piece is triggered, and protection such as inverse integral saturation and rate limitation is assisted. According to the scheme, the combustion phase and duration can be stably controlled under the wide-range working condition, circulation fluctuation and emission are reduced, the dilution limit is expanded, and the heat efficiency is improved.

The application discloses a cylinder early warning method and system based on indirect estimation of cylinder pressure state of an internal combustion engine, and the method collects a transient rail pressure signal in a common rail pipe through a high-frequency rail pressure sensor; according to a rail pressure drop segment feature caused by an oil injection event, an instantaneous oil injection rate curve of each cylinder varying with a crank angle is reconstructed; in a built cylinder combustion thermodynamic model, a complete cylinder pressure curve is obtained by angle-by-angle integral solution; characteristic parameters such as a highest explosion pressure, a pressure rise rate, an indicated mean effective pressure and a combustion phase are extracted from the cylinder pressure curve, and are compared with theoretical normal values or historical healthy values, so that online evaluation and fault early warning of the cylinder combustion state are realized. The application indirectly calculates the cylinder pressure through the rail pressure signal without increasing the hardware cost of the cylinder pressure sensor, establishes cross-domain quantitative correlation between the rail information and the cylinder combustion state, and has the advantages of low cost, strong universality and full-life-cycle self-adaptation.

A method for controlling a plurality of fuel injectors of a vehicle includes determining a total fuel mass for a combustion phase in a cylinder. The method may also include determining a first injection mass of the first fuel injector and a second injection mass of the second fuel injector. The sum of the first injection mass and the second injection mass is equal to the total fuel mass. The first fuel injector and the second fuel injector are configured to provide fuel to the cylinder. A first minimum mass per pulse of the first fuel injector is greater than a second minimum mass per pulse of the second fuel injector. The method may also include controlling the first fuel injector and the second fuel injector based at least in part on the first injection mass and the second injection mass.

The invention discloses a low-quality biomass fuel high-precision PM2.5 dynamic regulation and control method and a low-quality biomass fuel high-precision PM2.5 dynamic regulation and control system. According to the method, a multi-source process sensor is arranged in a combustion system, the temperature, smoke components and pressure of different areas of a combustion chamber and the operation state of air supply and a variable geometric structure are collected, and time sequence data are constructed. And based on the data, the combustion phase identification model obtained through training is used for judging the combustion stages of main combustion, fixed carbon burnout and the like through drying and volatilization analysis in real time, and the current PM. Concentration and the future trend are obtained through a PM2.5 soft measurement and prediction model. Under a predictive control framework, a controller optimizes and solves the conveying amount of primary air, secondary air and fuel and the opening degree of a variable geometric combustion channel, so that the effective sectional area and the axial position of a main combustion area are controllably adjusted, a flow field and residence time distribution are reconstructed in advance in the volatilization analysis stage, and source inhibition of a PM2.5 peak value is achieved.