60 results about "Diesel injection" patented technology

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.

The invention relates to an independent inner and outer needle valve type flexible fuel injector which comprises an injector shell, internally and externally nested needle valve matching parts, an electromagnetic control valve assembly and a double-row injection hole structure, and a diesel oil high-pressure oil way and a low-carbon fuel high-pressure oil way are arranged in the injector shell; the electromagnetic control valve assembly is arranged in the upper portion of the ejector shell, independently controls diesel oil injection and is of a hydraulic balance valve structure. Needle valve matching parts nested inside and outside are installed at the bottom of the ejector shell and connected with the electromagnetic control valve assembly through a spring guide sleeve, a limiting block and a middle rod. A double-row spray hole structure is arranged at the bottom of the internally and externally nested needle valve matching part; the inerting valve set is connected to the low-carbon fuel high-pressure oil way and used for purging and inerting during fuel switching. By means of the nesting needle valve, the diesel oil lubrication seal, the independent control valve and the inerting design, efficient and stable dual-fuel injection is achieved, the problem of mixing in the prior art is solved, the service life of the injector is prolonged, and the dual-fuel injector is suitable for ship engines with alternative fuel such as methanol / ammonia.

The invention provides an air compression device for an air-assisted injection system, which comprises an air pump cover, an air delivery pipe and a water outlet pipe, the air delivery pipe and the water outlet pipe are communicated through a pipeline, the water outlet pipe is connected with a radiator, an air filter is mounted on one side of the air pump cover, and an air valve group is hermetically mounted below the air pump cover and is hermetically connected with an air pump seat; an air pump piston group and a crankshaft are mounted on the air pump seat, the crankshaft drives the piston connecting rod group to reciprocate in a piston movement cavity of the air pump seat, and a water outlet of the air pump seat is communicated with a water inlet of the air pump cover. The air compression device for the air-assisted injection system has the advantages of being high in air supply pressure, stable in air pressure, flexible in arrangement, good in structural maintainability and the like, has the characteristic of direct driving of an engine crankshaft, solves the problems of poor fuel oil atomization quality and difficult whole machine ignition caused by low air-assisted diesel oil injection pressure, and also has the advantages of being simple in structure and convenient to use. The use reliability of the whole machine is improved, and the structure of the whole machine is more compact.

The invention discloses a methanol-diesel dual-fuel control system for an in-use diesel vehicle, which belongs to the technical field of diesel fuel control and comprises an engine controller and a methanol / diesel dual-fuel controller. According to the methanol / diesel oil dual-fuel controller, when an engine works in a dual-fuel mode, a methanol pump is started to achieve Peakamp; a methanol nozzle is driven to spray methanol in a Hold mode, and when the number of cycles reaches a calibration value, a mode switching relay is started in a Peakamp mode; oil sprayers of all cylinders are driven in a Hold mode; and the methanol / diesel oil dual-fuel controller is communicated with the data monitoring and mode switching module and the parameter calibration module through a CAN (Controller Area Network). By the adoption of the methanol-diesel dual-fuel control system for the in-use diesel vehicle, the injection phase of the ignited diesel and the fuel injection amount of the ignited diesel can be accurately controlled according to requirements, the high diesel substitution rate is achieved, and therefore the good dynamic property and economical efficiency are achieved.

The invention discloses a natural gas-diesel oil injection switching control system of a dual-fuel diesel engine, which relates to the technical field of automatic control and comprises a data acquisition monitoring module, a fuel analysis module, a prediction control module, a control optimization module and a switching protection module. Engine operation parameter data are collected in real time through an engine sensor interface and preprocessed, and fuel dynamic proportion analysis is carried out according to different rotating speeds and load intervals of an engine by taking a preset proportion as an initial reference datum and applying an intelligent algorithm; the engine can obtain the most appropriate natural gas and diesel oil mixing proportion under various working conditions, according to an ideal gas state equation, based on pressure and temperature data, monitored in real time, in a gas supply pipeline, dynamic compensation is conducted on the gas volume flow, real-time gas supply energy is calculated, the gas supply amount can be accurately controlled in the mode, and the gas supply efficiency is improved. It is guaranteed that the engine obtains stable and accurate energy supply, and therefore stable operation of the engine is maintained.

The invention provides a control method of a dual-fuel methanol-diesel dual direct injection engine and a vehicle, and the method comprises the following steps: determining the temperature working condition of the vehicle according to the environment temperature of the vehicle; under the extremely cold working condition, a diesel oil nozzle is controlled to inject diesel oil according to the first-time pre-injection, the second-time pre-injection, the third-time pre-injection and the main injection of each cycle, in the successive injection process, the corresponding angle of a crank angle in front of a compression top dead center is gradually reduced, and the injection amount is gradually increased; under the cold working condition, a diesel oil nozzle is controlled to inject diesel oil according to injection parameters corresponding to second-time pre-injection, third-time pre-injection and main injection; under the normal-temperature working condition, a diesel oil nozzle is controlled to inject diesel oil according to injection parameters corresponding to third-time pre-injection and main injection; and under the high-temperature working condition, a dual-fuel mode is directly entered, the diesel nozzle is controlled to inject diesel, and the methanol nozzle is controlled to inject methanol. Through the control method provided by the invention, the problem of poor cold starting performance caused by adopting a single diesel injection rate in the cold starting stage is solved.

The utility model discloses a multi-cylinder diesel oil injection pump oil mass control sleeve assembly assistive device which comprises a base, at least two oil mass control sleeve installation openings are formed in the front face of the base at intervals along a straight line, and an open structure communicated with the oil mass control sleeve installation openings is formed in the back face of the base. The pressing assembly comprises a pressing plate detachably installed on the back face of the base through a fastener and a rubber pressure transmitting plate clamped between the pressing plate and the base. The step positioning module is composed of a plurality of positioning bodies which are sequentially embedded in the oil mass control sleeve installation openings, and the axial heights of the positioning bodies are arranged in an equal difference progressive increase mode from one end to the other end; the toothed bar positioning mechanism comprises a toothed bar positioning plate which is vertically and fixedly arranged on the side edge of the mounting opening where the highest positioning body is located, and a toothed bar positioning pin which is detachably inserted into the positioning groove and is connected with the toothed bar in a matched mode is arranged at the top of the toothed bar positioning plate. The assembly assistive device has remarkable advantages in the aspects of press fitting, positioning, benchmark providing and the like, the assembly efficiency, precision and yield are improved, the service life is prolonged, and the practicability is high.

The invention aims to provide a single needle valve type high-response methanol-diesel injector based on opposed electromagnetic valve control, and belongs to the field of engines. Opposite type double-medium channel control assemblies are installed in an ejector connector body, an ejector middle body and an ejector throttling block, a methanol / diesel shared nozzle assembly is installed in a nozzle body, a diesel connector and a methanol connector are installed on the side of the ejector connector body, a high-pressure diesel channel is arranged in the diesel connector, and a high-pressure methanol channel is arranged in the methanol connector. Free connection and disconnection of an internal high-pressure methanol path and an internal high-pressure diesel path can be controlled, then independent injection of methanol fuel and diesel fuel is achieved, the two fuel injection modes are controlled through the same needle valve, the fuel is injected through the same injection hole, and the advantages of being high in reliability and simple in structure are achieved. And after methanol / diesel oil injection is finished, rapid cut-off of an internal passage of the injector and rapid seating of the needle valve can be achieved, and the response characteristic of fuel injection mode switching of the injector is improved.

The purpose of this invention is to provide a dual-fuel injector with variable injection patterns, belonging to the category of fuel injection devices. It includes a diesel injection section and a low-carbon fuel injection section, both located within the injector body. The diesel injection section, from top to bottom, includes a diesel accumulator chamber, a No. 1 injection control pipeline co-control module, a super hysteresis electromagnetic control needle valve limit module, and a diesel nozzle. The low-carbon fuel injection section, from top to bottom, includes a two-stage booster module, a low-carbon fuel thermal management accumulator module, a No. 2 injection control pipeline co-control module, and a low-carbon fuel nozzle. This invention enables independent injection of diesel and low-carbon fuels and effectively controls the phase state of the low-carbon fuel injected into the cylinder. By controlling the injection pressure and needle valve lift, it achieves flexible and variable injection patterns to meet the needs of different engine operating conditions. It also enables high-response needle valve closure and prevents secondary opening of the needle valve due to pressure fluctuations.

The present invention discloses a combustion system applicable to a large-bore ammonia-diesel engine, which includes an engine, a pre-chamber subsystem, a fuel supply subsystem, and an electronic control subsystem; the interior of the pre-chamber main body of the pre-chamber subsystem is of a plow-shaped structure, and a high-pressure double direct injection injector is installed on its upper left side; the fuel supply subsystem includes an ammonia tank, a diesel fuel tank, and an intake port ammonia injector. Two ammonia supply pipelines of the ammonia tank, one is connected to the liquid ammonia channel of the high-pressure double direct injection injector; the other is connected to the intake port ammonia injector; the diesel fuel pipeline is connected to the diesel fuel channel of the high-pressure double direct injection injector; the electronic control subsystem includes a temperature sensor, a glow plug, a high-pressure double direct injection injector, and an intake port ammonia injector, all of which are connected to the ECU unit. The ECU unit adjusts the injection strategy of the intake port ammonia injector according to the engine throttle opening; controls the liquid ammonia and diesel injection strategies of the high-pressure double direct injection injector and the heating switch of the glow plug according to the pre-chamber temperature to regulate the temperature and combustion mode of the pre-chamber.

The invention belongs to the technical field of engines, and discloses a methanol-diesel dual-fuel engine control method and device based on methanol substitution rate adaptive optimization, and the method comprises the following steps: step 1, calibrating an initial rotating speed-shaft power-methanol substitution rate MAP according to engine bench test data; 2, when the engine runs, the following signals including the rotating speed, the shaft power, the methanol injection amount, the diesel injection amount and the combustion state are collected and processed in real time; 3, calculating the current actual methanol substitution rate in real time according to the collected methanol injection amount and diesel injection amount; 4, according to the rotating speed and the shaft power which are currently collected in real time, the initial or latest self-learned rotating speed-shaft power-methanol substitution rate MAP graph is inquired, and the target methanol substitution rate under the working condition is obtained; pID control is adopted, SRtarget serves as a set value, SRactual serves as a process value, control output is obtained through calculation, and the diesel oil injection amount and the methanol injection amount are adjusted.

The invention discloses a dual-fuel single-cylinder engine combustion system based on water spraying-EGR cooperative control and a control method of the dual-fuel single-cylinder engine combustion system, and belongs to the technical field of engines. A dual-fuel single-cylinder engine combustion system based on water spray-EGR cooperative control comprises a hydrogen direct injection system, a diesel injection system, an air inlet channel water spray system, a turbocharging system, an EGR system and an electric control system, and a high-pressure water pump of the water spray system is connected with an air compressor of the turbocharging system through a coupler; the system further comprises an exhaust water circulation system, the exhaust water circulation system comprises a water-steam separator, the water-steam separator is connected to an engine exhaust pipeline, and the water separation end of the water-steam separator is connected with the water tank through a pipeline. One end of the EGR system is connected to an engine exhaust pipeline behind the water-steam separator, and the other end of the EGR system is connected to an engine air inlet pipeline in front of the air compressor. And the ECU performs water spraying-EGR cooperative control according to the working condition of the engine.

The invention provides an ammonia diesel dual-fuel engine combustion control system and method, and relates to the technical field of engines. The control system comprises an engine, an ammonia supply device, a control device and a diesel supply device, a cylinder cover of the engine is provided with a diesel electric control nozzle, and an air inlet valve of the engine is communicated with the air inlet pipe. The ammonia supply device comprises an ammonia gas bottle, an ammonia pipeline and a gas ammonia nozzle, and the control device is used for adjusting the energy substitution rate of ammonia by controlling the ammonia fuel injection amount of the gas ammonia nozzle and the diesel oil injection amount of the diesel oil electronic control nozzle and controlling the diesel oil electronic control nozzle to adopt different injection modes under the condition of different ammonia energy substitution rates. The control strategy that the overall excess air coefficient is 1.0 is adopted to reduce emission of nitric oxide and particulate matter in tail gas, different injection modes are adopted according to different ammonia energy replacement rates, the optimal in-cylinder combustion effect is achieved under the different ammonia energy replacement rates, the power of the engine is improved, the emission amount of the nitric oxide and the particulate matter is reduced, and the energy consumption of the engine is reduced. And efficient and stable combustion of the engine is realized.

The invention aims to provide a wide-range methanol / diesel oil dual-fuel injector with high injection stability, and belongs to the field of engines. A methanol injection control multi-way electromagnetic valve assembly is installed in the diesel oil connector body, a diesel oil injection control electromagnetic valve assembly is installed in the injector intermediate body, an oil way stop valve assembly is installed in the cone valve body, multi-position nested needle valve assemblies are installed in the inner needle valve intermediate body and the nozzle body, and a high-pressure methanol connector is installed on the side of the methanol connector body. A high-pressure diesel connector is installed on the side of the diesel connector body. According to the methanol / diesel oil dual-fuel independent injection system, methanol / diesel oil dual-fuel independent injection can be achieved, the methanol injection working condition range can be remarkably widened, the injector needle valve response characteristic is improved, the oil return amount is reduced, and then the methanol injection stability is improved; and various injection modes such as methanol micro-injection, diesel injection and methanol large-flow shoe-shaped injection can be realized.

The application provides a dual-fuel engine starting method, device, storage medium and system, the engine comprising: a methanol injector and a diesel injector, the methanol injector being installed to an air inlet pipe of the engine, and the diesel injector being installed to a cylinder cover of a cylinder of the engine, the method comprising: receiving and responding to an engine starting instruction, acquiring a plurality of temperature parameters, and determining a minimum temperature parameter in all the temperature parameters; when the minimum temperature parameter is less than a preset temperature, controlling the diesel injector to inject a preset first injection amount of diesel into the engine cylinder; determining a speed change rate of a process in which an engine speed changes from static to a first preset speed, and determining a second injection amount of diesel and a third injection amount of methanol according to the speed change rate and simultaneously controlling the diesel injector and the methanol injector to inject, so as to start the engine. The application solves the problem that methanol fuel has low vapor pressure and large latent heat, and thus it is difficult to start the engine at low temperature.

The invention discloses a diesel gasification device and a cyclic quantitative control method. The controller firstly preheats the heating piece and then controls the air inlet valve to be opened, so that air enters the mixing cavity through the air inlet pipe and the heating net, and the pressure in the cavity is adjusted to a preset pressure threshold upper limit Ptar1; the controller calculates the target fuel injection quantity of the liquid fuel injector according to the air state in the mixing cavity and the target equivalence ratio and controls the liquid fuel injector to complete fuel injection; the controller controls an oil and gas injection valve to be opened, an oil and gas mixture is injected till the lower limit Ptar2 of a preset pressure threshold value is reached, and after injection is finished, the controller calculates the residual air amount and the residual fuel oil amount in a mixing cavity based on the pressure, temperature and oxygen concentration detection signals after injection; and the controller opens the air inlet valve to supplement air to the mixing cavity until the pressure in the cavity reaches the pressure threshold upper limit Ptar1, then the air inlet valve is closed, the air supplement amount is determined according to the pressure difference before and after air supplement, and the needed oil supplement amount is calculated in combination with the target equivalence ratio. According to the invention, spray crushing and atomization are realized no longer depending on ultrahigh injection pressure.

The invention discloses an ammonia-natural gas synergistic combustion engine control system and control method, and relates to the technical field of engines, and the ammonia-natural gas synergistic combustion engine control system is characterized by comprising a fuel supply system, a high-pressure fuel rail system, an injection control system and an exhaust gas recirculation system, the fuel supply system comprises a diesel supply unit, a natural gas supply unit and an ammonia supply unit; the high-pressure fuel rail system comprises a high-pressure oil rail, a high-pressure gas rail and a high-pressure ammonia rail, and the high-pressure oil rail, the high-pressure gas rail and the high-pressure ammonia rail communicate with a combustion chamber of the engine through a diesel injector, a natural gas injector and an ammonia injector correspondingly. The diesel oil supply unit comprises an oil tank, a first filter and an oil pump; the oil pump pumps diesel oil out of the oil tank through the first filter and then distributes the diesel oil to a high-pressure oil rail or flows back to the oil tank through a second filter; the multi-fuel engine has the advantages that through cooperative use of various fuels, the engine can flexibly switch or mix the fuels according to the market price and the supply condition of the fuels, and the fuel cost is reduced.

A burner comprises a housing and a combustion chamber assembly. The combustion chamber assembly comprises a barrel portion, a mounting base, a first spark plug, a second spark plug, and a diesel nozzle assembly. The barrel portion comprises a combustion chamber. The mounting base comprises an air inlet passage and a mounting barrel portion. The first spark plug and the second spark plug both protrude into the combustion chamber. The diesel nozzle assembly is mounted on the mounting barrel portion, and the diesel nozzle assembly is configured to inject diesel into the combustion chamber. The diesel nozzle assembly comprises a valve needle, a first swirling assembly located at the bottom of the valve needle, and a sleeve portion located below the first swirling assembly, wherein the first swirling assembly comprises an inlet hole and a throttling injection hole, the sleeve portion is provided with a mixing chamber communicated with the throttling injection hole, and the mixing chamber is used for mixing diesel and air. The throttling injection hole improves continuity of diesel injection under low power.

The invention discloses an integrated combustion chamber of a diesel generating set, and relates to the technical field of diesel engines. When oil mist and air are not uniformly mixed, the phenomenon that the oil mist cannot be fully combusted during combustion occurs, and a large amount of carbon deposit occurs in the combustion chamber, according to the combustion chamber of the integrated diesel generating set, through cooperation of the protruding cambered surface at the center of the top of the piston and the cambered surface at the edge of the piston, when diesel oil is injected after the air is guided in, the combustion efficiency is improved, and the combustion efficiency is improved. The spraying direction of diesel oil corresponds to the center position of the top of the piston, the diesel oil is matched with upward movement of the piston when the diesel oil gas impacts downwards, the gas is guided through the protruding cambered surface, the diesel oil gas is diffused all around and fully mixed with air, and the situation that combustion is insufficient and carbon deposition is serious at the combustion position due to uneven mixing of the diesel oil is avoided.

The invention relates to the technical field of dual-fuel engines, in particular to a fuel control method for a methanol-diesel dual-fuel engine, which comprises the following steps: acquiring real-time data of a rotating speed value, a load value and a temperature value of the engine; inputting the real-time data into a pre-established engine working condition model, and outputting fuel demand characteristic parameters of the current working condition; inputting the fuel demand characteristic parameters into a pre-established injection proportion model, and outputting an injection proportion value of diesel oil and methanol; based on the injection proportion value, a fuel injection scheme of diesel oil and methanol is generated; according to the fuel injection scheme, a time sequence control algorithm is adopted to generate a diesel oil injection instruction and a methanol injection instruction with a time phase difference, and the mixing effect of diesel oil and methanol is monitored in real time; the injection proportion of diesel oil and methanol can be accurately adjusted, full mixing of the two kinds of fuel can be guaranteed through real-time monitoring, the fuel utilization efficiency is improved, emission is reduced, and stable operation and performance output of an engine are guaranteed.

According to the marine ammonia engine ammonia substitution rate adjusting system based on working condition self-adaption, whether the current working condition is the steady-state working condition or the transient working condition is judged through the rotating speed change rate and the load change rate, and then filtered multi-dimensional parameters are obtained; and a corrected transient ammonia gas replacement rate interval range and a corrected steady-state ammonia gas replacement rate interval range are obtained according to the filtered multi-dimensional parameters, then the ammonia gas valve opening degree and the diesel oil injection amount are obtained, an executing mechanism executes according to the ammonia gas valve opening degree and the diesel oil injection amount, and the problem that an existing adjusting method cannot dynamically adapt to transient load changes is solved.

The present application relates to dual-fuel engine technical field, especially to a kind of methanol-diesel dual-fuel engine's fuel control method, comprising: obtaining the real-time data of engine speed value, load value and temperature value;Real-time data is input into the engine operating condition model established in advance, and the fuel demand characteristic parameter of current operating condition is output;Fuel demand characteristic parameter is input into the injection ratio model established in advance, and the injection ratio value of diesel and methanol is output;Based on injection ratio value, generate the fuel injection scheme of diesel and methanol;According to fuel injection scheme, time sequence control algorithm is used to generate diesel injection command and methanol injection command with time phase difference, and the mixing effect of diesel and methanol is monitored in real time;Not only can the injection ratio of diesel and methanol be accurately adjusted, but also the sufficient mixing of two kinds of fuels can be ensured through real-time monitoring, the fuel utilization efficiency is improved, the emission is reduced, and the stable operation and performance output of engine are ensured.

The invention belongs to the field of dual-fuel engine starting, and particularly discloses a control method and system for the process from starting to idling of a dual-fuel engine, and the method comprises the steps that the diesel oil injection quantity, the injection advance angle, the diesel oil rail pressure and the throttle valve required opening degree in the engine starting process are obtained; starting an engine according to the fuel injection quantity and the injection advance angle; judging whether the rotating speed of the engine exceeds an idling takeover value; if the engine is not started again, the diesel injection advance angle is delayed in the starting process, the fuel injection quantity is increased, and the idling set value is triggered to be gradually transited to the final idling target value from the idling takeover value until the rotating speed of the engine exceeds the idling takeover value; if yes, directly triggering the idling set value to gradually transit to the final idling target value from the idling takeover value; and after the idle speed is stable, the injection quantity and the injection advance angle of the diesel oil are gradually transited to the injection quantity and the injection advance angle of micro-injection ignition.

The invention discloses a method, a device, equipment and a medium for removing deposited carbon of a dual-fuel engine, and the method comprises the following steps: acquiring operating parameters of the engine, calculating deposited carbon removing parameters based on the operating parameters, and judging whether the engine reaches a deposited carbon removing stage based on the deposited carbon removing parameters; and when the engine reaches the carbon deposition removal stage, the diesel oil injection duration of the engine each time is controlled to be the carbon deposition removal duration, otherwise, the diesel oil injection duration of the engine each time is controlled to be the normal operation duration, and the normal operation duration is smaller than the carbon deposition removal duration. By increasing the diesel injection time, the accumulated carbon in the diesel injection hole is removed, the problems of insufficient power, engine flameout and the like caused by blockage of a fuel injector of an engine are solved, and the service life of the injector is prolonged.

The invention aims to provide a high-flow dual-fuel injection system cooperatively controlled by multiple electromagnetic valves, and belongs to the field of injection systems. Comprising a diesel oil supply module which comprises a fuel filter, an electronic unit pump and a pressure stabilizing assembly; the methanol fuel supply module comprises a conveying pump set and a common rail pipe; a diesel oil and methanol integrated injector structurally comprises a diesel oil injection unit and a methanol injection unit with different control strategies. The diesel oil conveying system and the methanol supply system which are independent of each other are adopted, the dual-fuel mixed injection function is achieved, meanwhile, diesel oil is used as a control medium for methanol injection, and the corrosion risk of methanol to an injector material is reduced. According to the invention, oil supply of the electronic control unit pump is matched with the electronic control injector, and large-flow injection of two fuels of diesel oil and methanol is realized through cooperative control of multiple electromagnetic valves. Through the design of the diaphragm type voltage stabilizer, the influence of oil supply pressure fluctuation of the electronic unit pump on the working performance of the ejector is improved.

The utility model belongs to the field of ammonia-diesel oil dual-fuel engines, and discloses a nozzle cooling structure of a marine ammonia-diesel oil dual-fuel engine. Comprising an ammonia fuel injector, a conveying pipeline for conveying an injection object to the ammonia fuel injector and a diesel injector, in the ammonia fuel mode, an injection substance supplied to the ammonia fuel injector by the conveying pipeline is ammonia fuel; in the diesel oil mode, an injection object supplied to the ammonia fuel injector by the conveying pipeline is liquid which is used for refrigeration and does not react with ammonia gas and diesel oil and is used for refrigeration. The problem of nozzle dry burning of the ammonia fuel injector in a diesel oil mode is solved, and the service life is prolonged.

The invention provides an application method for improving methanol combustion efficiency in a medium-speed diesel and methanol dual-fuel engine, and relates to the field of engine combustion technologies and alternative fuels. 2, an air inlet system is transformed; step 3, performing a dual-mode control strategy; 4, load self-adaptive adjustment is carried out; 5, the combustion efficiency is improved, and the problems that the calorific value of methanol is less than half of that of diesel oil, the volume calorific value is low, and if an existing diesel oil injection system is directly used, the engine power is greatly reduced are solved; the diesel oil injection performance is deteriorated by simply increasing the injection quantity; in addition, when the air inlet channel is used for spraying the methanol, the problem of methanol knocking easily occurs, and the substitution rate of the methanol is limited is solved.

This utility model discloses a dual-fuel engine injector that can solve the problem of nozzle blockage, belonging to the field of injector technology. It includes an injector body and a needle valve body. A first needle valve passes through the needle valve body, and a second needle valve passes through the first needle valve. Multiple diesel injection holes are arranged at the bottom of the first needle valve. The inner wall of the diesel injection holes contains multiple spiral grooves, including several main spiral grooves and several secondary spiral grooves. The secondary spiral grooves are spirally arranged at the inlet and outlet ends of the diesel injection holes, and the main spiral grooves are spirally arranged continuously between the inlet and outlet secondary spiral grooves. Before the diesel fuel enters the main spiral groove and undergoes large-scale rotation, it is slowly accelerated at the inlet end of the secondary spiral groove. After flowing out of the main spiral groove, the rotational scale is reduced at the outlet end of the secondary spiral groove, ensuring the flow cross-sectional area. This allows the diesel fuel in the injection holes to generate rotational motion and increase speed, achieving a flushing effect on the inner wall, while also stabilizing the injection flow at the outlet end, ensuring stable combustion in the engine cavity.

The present application provides a method and device for identifying poisoning of a diesel oxidation catalyst, specifically related to the technical field of internal combustion engines. In the present application, the type of poisoning of the diesel oxidation catalyst is identified based on thermal management means. Specifically, thermal management of the diesel oxidation catalyst is achieved by injecting diesel at different diesel injection amounts at the inlet of the diesel oxidation catalyst and performing exhaust thermal management operations on the diesel engine. The type of poisoning of the diesel oxidation catalyst is identified according to the temperature state at the outlet of the diesel oxidation catalyst under different conditions, and then different operations are performed for different types of poisoning of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst.

The application provides a method and device for determining oil dilution, a storage medium and an electronic device. The method comprises the following steps: determining that a diesel particulate filter enters an active regeneration process, the active regeneration process being a process of removing particles deposited in a filter of the diesel particulate filter by injecting diesel into a cylinder through post-injection; obtaining a first diesel injection amount and a second diesel injection amount, the first diesel injection amount being a total amount of diesel injected into the cylinder through post-injection, and the second diesel injection amount being an amount of diesel entering a diesel oxidation catalyst for reaction; determining a third diesel injection amount according to a difference between the first diesel injection amount and the second diesel injection amount, the third diesel injection amount being an amount of diesel injected onto an inner wall of the cylinder through post-injection. The method can accurately identify the oil dilution condition based on the calculation of the amount of diesel injected onto the inner wall of the cylinder through post-injection in the DPF active regeneration process chemical reaction.