7610results about "Fuel injection control" patented technology

To provide a bi-fuel vehicle capable of preventing a driver from feeling bothered even in a situation where restart occurs frequently.SOLUTION: A bi-fuel vehicle is equipped with an engine 2 to which one of two types of fuel: CNG, which is gaseous fuel; and gasoline, which is liquid fuel, selected and supplied as fuel to be injected into a combustion chamber of each cylinder, and comprises an ECU 8 that controls an idling stop function that stops the engine 2 when a preset automatic stop condition is established and restarts the engine 2 when the preset restart condition is established. The ECU 8 selects gasoline as the fuel to be injected into the combustion chamber of each cylinder of the engine 2 when it is predicted that automatic stopping and restarting of the engine 2 may be repeated a predetermined number of times or more within a predetermined time.SELECTED DRAWING: Figure 1

The invention discloses an optimization control method for a target EGR rate, which comprises the following steps: entering EGR closed-loop enabling under the condition of meeting the closed-loop enabling of an EGR system, determining a filtering time coefficient of the target EGR rate according to the response time of a supercharger and the time of exhaust gas flowing from an EGR valve to an EGR exhaust gas convergence point, and calculating the change rate of the filtering time coefficient of the target EGR rate; obtaining filtering time according to a filtering time learning coefficient and the change rate of the filtering time coefficient of the target EGR rate; according to the filtering time and the target EGR rate, the filtered target EGR rate is obtained; and an EGR valve is controlled according to the filtered target EGR rate. According to the method provided by the invention, the target EGR rate can be optimized, the influence on engine knock deterioration when EGR enters is improved, and meanwhile, the supercharging control stability and the emission performance of the engine are improved.

The present invention discloses a method and device for determining the effectiveness of a diesel generator set fault preventive test. The method comprises obtaining vibration data, temperature data, vibration time series, temperature time series and test data of the diesel generator set; performing denoising and dimensionality reduction processing on the vibration data and temperature data to obtain a fused feature matrix, and inputting it into a fault classification model to obtain the fault type; performing time series alignment on the vibration time series and the temperature time series to obtain time series data, and inputting it into a prediction model to obtain vibration prediction values ​​and temperature prediction values; performing deviation correction on the test data, and inputting the corrected data into a pre-built test prediction model to obtain prediction test conditions; and performing generator fault prevention operations and prevention effectiveness evaluation according to the fault type, vibration prediction value, temperature prediction value and prediction test conditions. The method solves the problem of being unable to accurately perform fault diagnosis and preventive maintenance of diesel generators.

The invention relates to the technical field of fault detection, and discloses a diesel generating set fault detection method and system based on deep learning, and the method comprises the steps: obtaining first vibration signal data, and carrying out the time-frequency decomposition, and obtaining a dynamic change feature; de-noising processing is carried out on the dynamic change features to obtain a time-frequency feature sequence; extracting a peak energy distribution data set, and calculating each frequency band entropy value to obtain a frequency band entropy value sequence; classifying the frequency band entropy sequence, determining a random fluctuation reference mode, and separating to obtain an abnormal frequency component; calculating a spectral line spacing and amplitude ratio, obtaining a spectral line feature data set, classifying the spectral line feature data set, and determining a fault classification result; obtaining current second vibration signal data, performing similarity calculation on the current second vibration signal data and a pre-established normal mode library, and outputting a fault feature vector; and verifying the fault feature vector to obtain a final fault detection result. According to the method, closed-loop diagnosis from signal acquisition to fault classification can be realized, and the fault detection precision of the diesel generating set is improved.

The invention provides an efficient and stable ship hybrid power generation system which comprises a hydrogen production unit and an ammonia supply system, and the hydrogen production unit comprises an ammonia decomposer, a hydrogen separator, a high-pressure hydrogen storage tank, a fuel cell and an ammonia-hydrogen internal combustion engine. The ammonia decomposer enables the ammonia flow to enter the ammonia decomposer in a segmented constant mode for catalytic decomposition through four set working conditions; the hydrogen separator is used for separating and purifying the generated mixed gas, and the separated and purified hydrogen is respectively fed into the fuel cell and the ammonia-hydrogen internal combustion engine through valves for power generation; the molten salt system recycles high-temperature tail gas of the ammonia-hydrogen internal combustion engine through the heat exchanger for heat energy storage and power generation through the steam Rankine cycle system. The regulation and control method is used for stabilizing the system and prolonging the service life of equipment by limiting the dynamic loading rate and start-stop times of the fuel cell and the ammonia-hydrogen internal combustion engine, and is used for waste heat recovery power generation through the molten salt and the steam expansion machine, so that the efficiency of the system is improved.

The invention discloses a transmission driving control method of a bimodal integrated engine. The transmission driving control method comprises the following steps: S1, state sensing; s2, mode decision making; S3, dynamic adjustment; s4, mode switching; S5, power optimization distribution; s6, adaptive learning is carried out; and S7, fault-tolerant guarantee. The invention further discloses a bimodal integrated engine transmission system which comprises the following modules: a power input module; a transmission adjusting module; a state sensing module; an intelligent control module; and a fault-tolerant guarantee module. Parameters are dynamically adjusted through fuzzy PID control according to speed deviation, meanwhile, real-time correction is conducted in combination with a multi-mode intelligent algorithm, speed fluctuation is precisely controlled within + / -3 km / h, flight stability is guaranteed, a model prediction control and multi-mode intelligent control cooperation mechanism is adopted, an optimal power output sequence is calculated in advance, coordinated distribution is completed, and the optimal power output sequence is controlled to be within + / -3 km / h. The dynamic response speed is increased by 40%, and the high-dynamic task requirement is met.

The invention discloses a mixing valve opening degree control method, device and equipment and a medium, and the method comprises the steps that when a mixing valve is in a transition working condition from full opening to non-full opening, the current mixing valve opening degree and the mixing valve opening degree change rate are obtained; determining the maximum boost pressure, the minimum boost pressure, the current target boost pressure and the current actual boost pressure, and determining a mixing valve opening change rate correction coefficient and locking time based on the maximum boost pressure, the minimum boost pressure, the current target boost pressure and the current actual boost pressure; wherein the locking time refers to the time for keeping the current opening degree of the mixing valve unchanged; after the locking time is over, the mixing valve opening degree change rate is corrected based on the mixing valve opening degree change rate correction coefficient, and the final mixing valve opening degree change rate is obtained; and based on the current mixing valve opening and the final mixing valve opening change rate, the mixing valve control opening is determined. According to the method, the change rate of the opening degree of the mixing valve is controlled and optimized from the angle of improving the boost pressure control precision.

The invention discloses an optimization control method for pressurization closed-loop enabling. The optimization control method comprises the steps that whether the pressure in a compressor of an engine supercharger assembly meets the minimum pressure condition or not is judged; judging whether the engine speed meets the engine speed condition or not; whether a pressure release valve of the engine supercharger assembly is not opened or not is judged; if all the judgments are yes, pressurization closed-loop enabling is allowed, and pressurization closed-loop control is carried out after pressurization closed-loop enabling; otherwise, the pressurization closed-loop enabling is not carried out. According to the method, the pressurization closed-loop enabling condition is optimized, the pressure control stability when pressurization enters a closed loop is improved, the pressurization responsiveness and the EGR system responsiveness are improved, pressurization closed-loop control is optimized, in other words, the engine rotating speed condition and the minimum pressure condition are optimized under different EGR working conditions, and therefore the engine performance is improved. And dynamic learning optimization is carried out under the minimum pressure condition, learning parameters are continuously updated in the subsequent control process, and the pressurization control stability is further improved.

A hydrogen supply assembly for an aircraft propulsion system includes a storage housing, a hydrogen supply component, and a leak detection system. The storage housing surrounds and forms a storage plenum. The hydrogen supply component is disposed within the storage housing coincident with the storage plenum. The leak detection system includes an interior pressure sensor, an exterior pressure sensor, and a controller. The interior pressure sensor is connected in fluid communication with the storage plenum. The exterior pressure sensor is connected in fluid communication with an ambient atmosphere outside the storage housing. The controller is configured to determine a differential pressure between the storage plenum and the ambient atmosphere with the interior pressure sensor and the exterior pressure sensor and identify a presence or an absence of hydrogen leakage from the hydrogen supply component to the storage plenum by comparing the determined differential pressure to a first differential pressure threshold.

The invention discloses an optimal control method for target boost pressure, which comprises the following steps of: entering boost closed-loop enabling under the condition that boost closed-loop enabling conditions are met, and obtaining a filtered EGR rate characteristic coefficient after first-order low-pass filtering according to filtering time and an EGR rate characteristic coefficient; according to the currently disclosed target supercharging pressure, the EGR rate characteristic coefficient and the filtering EGR rate characteristic coefficient, the target supercharging pressure which is not dynamically optimized is obtained through calculation; dynamically optimizing the target supercharging pressure which is not dynamically optimized according to the actual supercharging pressure read in real time to obtain the dynamically optimized target supercharging pressure; and controlling a supercharging actuator according to the dynamically optimized target supercharging pressure. According to the method provided by the invention, optimal control on the target supercharging pressure can be realized, and the supercharging closed-loop control stability and the EGR response precision are further improved.

The invention provides a power control method and a related device, and relates to the field of range extenders. After a hydraulic system working instruction is received, if it is determined that a power advance control strategy needs to be adopted, before the current of a hydraulic displacement control valve is adjusted according to the hydraulic system working instruction, the power advance control strategy is adopted; the power of an engine and the power of a target generator are adjusted to the total power required by the engine, which is calculated based on the target hydraulic power and the power generation required power, so that the current engine power can meet the power generation power requirement and the power requirement of a hydraulic system after responding to a working instruction of the hydraulic system; and then the hydraulic displacement control valve current is adjusted according to the hydraulic system working instruction, after the hydraulic displacement control valve current is adjusted, the hydraulic power begins to change, and during the hydraulic power change period, the power of the target generator can be adjusted based on the hydraulic power change, so that the engine can provide the hydraulic power needed by the hydraulic system in real time.

The invention relates to the technical field of ship power, in particular to a dual-fuel ship fuel switching method and device and a storage medium, and the method comprises the steps that first engine performance data and engine state data corresponding to the first engine performance data are acquired; preprocessing the first engine performance data and the engine state data; the preprocessed first engine performance data are input into a target prediction control model for switching strategy prediction, and a fuel switching strategy corresponding to the engine is obtained; inputting the engine state data into the target fault prediction model for fault prediction to obtain a switching decision; a fuel switching strategy is sent to the control module according to the switching decision, so that the control module processes the fuel switching process according to the fuel switching strategy; and second engine performance data are received, and the fuel switching strategy is adjusted according to the second engine performance data. And seamless switching or cooperative use between liquefied natural gas and diesel oil of a ship can be met.

A system includes a controller communicably coupled to a hydrogen fueled internal combustion engine. The controller includes at least one processor coupled to at least one memory device storing instructions that, when executed by the at least one processor, cause the controller to perform operations. The operations include receiving an engine shutdown request and responsive to receiving the engine shutdown request, executing an engine shutdown procedure including causing the engine to continue to rotate for at least a predetermined number of rotations or at least a predetermined time period.

The invention discloses a surge valve control method and device, electronic equipment and a vehicle, relates to the field of engines, and aims to determine whether an engine is in a target working condition representing that a supercharger is liable to have a surge phenomenon or not. And on the basis of determining that the engine is in the target working condition, according to the intensity of the change of the operation state of the engine under the target working condition, when the engine is determined to be in a relatively strong transient working condition, whether a surge valve is opened or not is determined in time in combination with the opening degree of a throttle valve. And when it is determined that the surge valve is not opened, whether the surge valve is opened or not is further determined according to the air inlet flow of the engine and the opening degree of the throttle valve. Whether the surge valve is opened or not is judged according to the target working condition, the strong transient working condition and the surge flow of the engine in sequence, the multiple working conditions and operation conditions of the engine are synthesized, the opening condition of the surge valve is more accurately determined, the situation that the surge valve is opened abnormally can be effectively reduced, and therefore the situation that power of the engine is insufficient is effectively reduced.

The invention discloses a motorcycle emission fuel injector control method, system and equipment and a storage medium, and relates to the technical field of internal combustion engine control. According to the method, the real-time temperature of the fuel injector under the unheated condition is obtained, and the preheating temperature threshold value of the fuel injector is determined based on the difference value between the real-time temperature and the target temperature; acquiring a first temperature change rate of the fuel injector in each preset time period under the condition that the fuel injector is heated by a heat source of the motorcycle according to the preset heat supply amount; the preset heat supply amount is adjusted according to the first temperature change rates, and the target heat supply amount is obtained; a heat source of the motorcycle is controlled to heat a fuel injector according to the target heat supply amount until the real-time temperature reaches the preheating temperature threshold value, and emission parameters of a motorcycle engine are monitored; and the fuel injection amount of the fuel injector is determined based on the emission parameters and the emission parameter standard, and the fuel injector is controlled to inject according to the fuel injection amount. The motorcycle engine has the effect of improving the emission performance of the motorcycle engine.

The invention discloses a control method for improving the cold starting performance of a methanol extended-range hybrid power system, relates to the field of engine control, and solves the technical problem that the existing methanol engine starting mode has limited effects on the thermal atmosphere of methanol atomization, premixing and methanol injection ignition success under the low-temperature condition. The method comprises the steps that an engine starting success condition is set, the real-time environment temperature is obtained, when the real-time environment temperature is larger than the preset first starting temperature, a first starting strategy is adopted to start an engine, and whether the engine is started successfully or not is judged according to the engine starting success condition. The invention further discloses a system for improving the cold start performance of the methanol extended-range hybrid power system. Methanol atomization is promoted, methanol is fully premixed, and the successful thermal atmosphere effect and success rate of a methanol injection point are improved.

The invention provides an anti-flameout exhaust gas recirculation (EGR) system control method and device, and belongs to the field of engine control. According to a pre-calibrated and stored first corresponding relation, an inter-cooled theoretical temperature corresponding to an actual environment temperature is determined and obtained, and the cooling flow of an intercooler is correspondingly adjusted; according to the method, the actual temperature after intercooling of engine inlet air subjected to intercooling through an intercooler is made to be close to the theoretical temperature after intercooling, but a temperature difference value still exists between the theoretical temperature after intercooling and the actual temperature after intercooling, and an EGR correction coefficient corresponding to the temperature difference value and the engine load is further determined according to a pre-calibrated and stored second corresponding relation; and the EGR rate is corrected according to the EGR correction coefficient to obtain the target EGR rate, and the EGR valve is controlled according to the target EGR rate, so that engine flameout caused by condensed liquid water of the engine is avoided, and stable operation of the engine is ensured.

The invention relates to the technical field of oil nozzles, in particular to an efficient atomization injection system for a direct injection oil injector in a cylinder. According to the technical scheme, an injection execution unit adopts a laser-cladded asymmetric injection hole array, fuel oil is evenly distributed in a combustion chamber through aperture gradient distribution and logarithmic spiral arrangement, and the oil-gas mixing effect is enhanced. The dynamic pressure adjusting unit is integrated with an MEMS film sensor array and a fuzzy neural network controller, a sensor can accurately monitor fuel oil pressure in real time, and the controller is based on a 7-12-3 type BP network and can rapidly and accurately adjust fuel injection pressure according to the working condition of an engine through mass data training. The fuel oil pretreatment unit comprises an ultrasonic cavitation device and a graded heating system, the ultrasonic cavitation device reduces the viscosity of fuel oil, and the graded heating system accurately controls the temperature by means of a PTC heater, a semiconductor laser and a vortex generator. The three units work cooperatively, the fuel oil atomization and combustion efficiency is greatly improved, pollutant emission is reduced, and the engine performance is remarkably improved.

The invention provides a marine methanol fuel regulation and control system and method. The marine methanol fuel regulation and control system comprises a supply device and a control device, wherein the supply device is used for outputting methanol to an engine; the monitoring device is connected with the supply device and is used for acquiring the pressure in the supply device; the purging device is connected with the supply device and is used for purging the methanol in the supply device; the releasing device is connected with the purging device and is used for receiving and releasing the methanol discharged by the purging device; and the pneumatic device is connected with the supply device, the monitoring device, the purging device and the relief device and used for controlling opening and closing of the supply device, the purging device and the relief device according to the pressure obtained by the monitoring device. According to the marine methanol fuel regulation and control system, methanol fuel with appropriate pressure and flow can be provided for equipment such as a high-pressure methanol dual-fuel medium-speed engine, meanwhile, the pneumatic device can achieve internal control of the system, and related functions are completed.

The invention provides a diesel-methanol mixed fuel engine control method and system, and the method comprises the steps: obtaining real-time working condition data including the rotating speed, load and temperature parameters of an engine, and determining the optimal supply ratio of diesel to methanol under the current working condition according to the real-time working condition data in combination with a preset fuel characteristic difference model; calculating the concentration of the mixed gas of methanol and diesel oil according to the optimal supply proportion; and if the concentration of the mixed gas exceeds the preset threshold value, the injection pressure of methanol is adjusted, so that the concentration of the mixed gas returns to the target range. After the methanol injection frequency is increased, if the combustion rate is lower than the preset lower limit value, the injection direction of the methanol injector is adjusted, and the mixing uniformity is improved; and if the combustion rate is still lower than the preset lower limit value, the methanol injection opportunity is adjusted, methanol injection and diesel injection are optimally matched in time, it is ensured that the output power of the engine is stable, and meanwhile the aim of efficient and clean operation is achieved.

The invention relates to a composite injection hydrogen internal combustion engine and an injection control method thereof, and the composite injection hydrogen internal combustion engine comprises an air inlet system, a low-pressure air inlet channel hydrogen supply system, a high-pressure in-cylinder direct injection hydrogen supply system, an ignition system and a control system, the control system dynamically adjusts the ratio of low-pressure gas inlet channel hydrogen injection to high-pressure cylinder internal direct injection hydrogen by correspondingly controlling the working states of the gas inlet system, the low-pressure gas inlet channel hydrogen supply system and the high-pressure cylinder internal direct injection hydrogen supply system, and specifically, the ratio of low-pressure gas inlet channel hydrogen injection to high-pressure cylinder internal direct injection hydrogen injection is adjusted according to the rotating speed and target power of an engine. The proportion of air inlet channel injection and in-cylinder direct injection is dynamically adjusted. Compared with the prior art, a composite double-injection mode is introduced, more accurate combustion control can be achieved, higher flexibility and adaptability are provided, the performance and combustion efficiency of the hydrogen internal combustion engine can be optimized within a wider working condition range, and the combustion stability and fuel economy of the engine are effectively improved.

A precombustion chamber igniter with a retractable electric glow plug and a cold start control method for a methanol engine are provided. The precombustion chamber igniter includes a fuel injector, a spark plug, and an electric glow plug. The electric glow plug is retractable and has two working positions, at a first position, a heating segment is wholly located in an injection chamber to provide heat energy for the injection chamber, and at a second position, the heating segment is partially located in the injection chamber and passes through a first through hole, and the rest of the heating segment is located in a main combustion chamber of an engine, to provide heat energy for the injection chamber and the main combustion chamber. In a cold start stage of the engine, the heating segment of the electric glow plug is controlled to be located at the second position.

The invention provides an injection control method for a diesel-methanol dual-fuel engine, which comprises the following steps: acquiring a rotating speed signal, a load signal and a temperature signal of the engine, and determining initial diesel injection timing data and initial methanol injection timing data under the current working condition by combining preset respective injection MAP maps of dual fuels; according to the initial diesel injection timing data and the initial methanol injection timing data, the response time of each injector is fused, a dual-fuel injection time sequence model under a unified control framework is constructed, and the initial fusion injection moment is obtained; and according to the preliminary fusion injection time and the actually required injection duration, in combination with a preset injection priority rule, optimized dual-fuel injection time sequence control parameters are obtained through a self-adaptive genetic algorithm.

An apparatus and method for injection of a pilot fuel into an internal combustion engine includes a variety of steady state, transient and other techniques to reduce an injection quantity of the pilot fuel and / or a carbon content of the pilot fuel.

Systems and methods for using machine learning to improve control, management, and operation of vehicle systems are disclosed. A system includes a processing circuit configured to: receive information indicative of an observed state of a vehicle system from a sensor of the vehicle, the vehicle system including a fuel system; determine a predictive state of the vehicle system over a prediction horizon; determine one or more constraints for the vehicle system; execute a control problem to determine a predictive state of the vehicle system based on the one or more constraints; determine a plurality of control inputs for the vehicle system based on the executed control problem; and command the fuel system of the vehicle based on at least one of the determined plurality of control inputs.

The invention discloses an automobile air flow sensor fault diagnosis method and system, and relates to the technical field of intelligent fault diagnos.The method comprises the steps that driving behavior parameters are collected in real time, and driving style feature vectors are obtained through classification of a driving behavior recognition model; theoretical air inflow is calculated based on an engine three-dimensional fluid dynamic model, and dynamic correction is carried out in combination with driving style characteristics to generate a corrected theoretical flow signal; and finally, the actually measured signal of the air flow sensor and the corrected theoretical signal are compared and analyzed, and accurate diagnosis of the fault of the air flow sensor is realized. The technical problems that an existing air flow sensor fault diagnosis method cannot depend on a static threshold value, is difficult to adapt to driving styles and working condition changes, is insufficient in accuracy and is prone to false report and missing report are solved, self-adaptive correction of the theoretical air inflow is achieved by combining driving behavior recognition and dynamic correction, and therefore the diagnosis accuracy is improved, and the fault diagnosis efficiency is improved. And false alarm and missing alarm are reduced.

The present application discloses a method and system for an emission control device including a particulate filter with a bypass. In one example, the method includes bypassing the particulate filter when the exhaust gas has a reduced soot load and when the particulate filter has a reduced soot storage. The method further includes reducing the filter bypass flow and terminating or adjusting a deceleration fuel cut-off operation due to an exhaust gas temperature near the particulate filter being above a threshold.

A fuel pressure controller includes processing circuitry that executes a first process, a second process, and a third process as a fuel pressure reduction control. The first process includes closing both a first electromagnetic valve and a second electromagnetic valve. The second process includes adjusting the pressure of the fuel supplied to a fuel injection valve by repeatedly performing an opening and closing operation of the second electromagnetic valve. The third process includes, when the fuel pressure in a fuel pipe between the first electromagnetic valve and the second electromagnetic valve reaches a prescribed pressure, stopping the opening and closing operation of the second electromagnetic valve to maintain the second electromagnetic valve in an open state, and repeatedly performing the opening and closing operation of the first electromagnetic valve to adjust the pressure of the fuel supplied to the fuel injection valve.

The invention relates to a method and device for obtaining the actual supercharging pressure of an engine. The method comprises the steps that the air inlet pressure of an outlet of a throttle valve and the air inlet pressure of an inlet of the throttle valve are obtained; and judging whether the throttle valve is in a normal control mode, an anti-overshoot control mode or a full-open control mode, and for different modes, selecting corresponding transition coefficients to calculate the actual boost pressure of the engine by combining the intake pressure of the outlet of the throttle valve and the intake pressure of the inlet of the throttle valve. According to the method, on the basis of different working modes of the throttle valve, the boost pressure control deviation, the intake pressure control deviation and the intake pressure response condition are considered at the same time, the calculation method of the actual boost pressure is optimized, meanwhile, learning parameters of the actual boost pressure are continuously updated in different life cycles, and the control precision of the intake pressure is improved.

The invention relates to the technical field of diesel generating sets, in particular to a master control loop of diesel generating set equipment. The system comprises a data acquisition module, a model creation module, a dynamic adjustment module and a multi-machine parallel module. Power change data of a load and rotating speed data of an engine are acquired through the data acquisition module, a long-short-term memory network model for predicting the rotating speed of the engine is constructed by utilizing the model creation module, and the fuel injection quantity of the engine is calculated by utilizing a PID control algorithm according to the predicted rotating speed value of the engine through the dynamic adjustment module. According to the change of load power, the fuel injection quantity of an engine is dynamically adjusted, the rotating speed of the engine is regulated and controlled to be in a stable state, it is guaranteed that a generator outputs stable voltage, a multi-machine parallel module controls the output power and frequency of each unit through a droop control method, the frequency is automatically adjusted, and phase embedding is synchronous; and multi-machine parallel loading is realized.