CN110500204B - Self-priming engine for natural gas generator set and low-emission control strategy thereof - Google Patents
Self-priming engine for natural gas generator set and low-emission control strategy thereof Download PDFInfo
- Publication number
- CN110500204B CN110500204B CN201910855930.8A CN201910855930A CN110500204B CN 110500204 B CN110500204 B CN 110500204B CN 201910855930 A CN201910855930 A CN 201910855930A CN 110500204 B CN110500204 B CN 110500204B
- Authority
- CN
- China
- Prior art keywords
- oxygen
- control unit
- engine
- unit ecu
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/10—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a self-priming engine for a natural gas generator set, which comprises a first mixer, a gas supply device, a second mixer and an oxygen injection device, wherein a gas outlet of the second mixer is connected to an engine body through a gas inlet pipeline, a gas inlet control device is arranged on the gas inlet pipeline, the engine body is provided with a parameter detection device, the gas supply device, the oxygen injection device, the gas inlet control device and the parameter detection device are respectively connected to an electronic control unit ECU, and the electronic control unit ECU is connected to an ignition coil; the oxygen injection device increases the oxygen content entering the cylinder, does not change the exhaust quantity of the engine, improves the power performance and economy of the engine, does not deteriorate the emission, can further increase the ignition advance angle of the engine under the condition of oxygen-enriched combustion, improves the combustion efficiency of the engine, and can also effectively reduce the transformation cost of low emission of the engine.
Description
Technical Field
The invention relates to a self-priming engine for a natural gas generator set and also relates to a low-emission control strategy of the engine.
Background
At present, with the upgrading of emission regulations, the existing lean-burn self-priming natural gas engine is difficult to meet the stricter emission regulation requirements, the engine needs to be changed into a theoretical air-fuel ratio plus a three-way catalyst, the theoretical air-fuel ratio technical route has high requirements on the heat load of the engine, brand new materials and design are required on the whole lean-burn engine, the cost is huge, and the reliability of the engine can be reduced after long-time use.
Through researches, the existing lean combustion emission bottleneck is mainly NO x Exceeding the limit, if NO can be reduced by some method x Emissions can greatly increase the cost of modification of the engine. For example, to reduce NO at present x The mature scheme is to use denitration equipment, and the product has high priceAre typically used in large genset projects, and rarely in single small gensets (e.g., those below 200 kW).
According to analysis of NO x The main factor of production is N 2 And O 2 Chemical reactions occur at high temperatures and pressures, and thus reducing the in-cylinder temperature of the engine can effectively reduce NOx production. Specifically, the temperature in the cylinder of the engine can be reduced by increasing the air inflow of the air of the engine, and at present, a method of supercharging air inflow is often adopted for increasing the air inflow of the engine, namely, increasing the excessive air in the cylinder. If the method of increasing the pressurizing capacity is adopted to increase the air, the amount of the oxygen entering the cylinder is increased and the nitrogen is increased simultaneously due to the increase of the air amount, so that NO x The reduction range of (2) is severely limited and the amount of the supercharged air is not well controlled, so that the improvement effect is not obvious.
Disclosure of Invention
The invention aims to solve the technical problem of providing the self-priming engine for the natural gas generator set, which is characterized in that pure oxygen is sprayed into an air inlet pipeline, the content of oxygen entering an air cylinder is increased, the exhaust gas quantity of the engine is not changed, the intensified combustion of the engine is realized, and the thermal efficiency of the engine is rapidly improved.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a natural gas generating set is with inhaling formula engine certainly, includes the first blender that is equipped with the air inlet, another air inlet of first blender is connected with gas air feeder, the gas outlet of first blender passes through the air inlet of pipe connection to the second blender, another air inlet of second blender is connected with oxygen injection apparatus, the gas outlet of second blender passes through the air inlet line and is connected to the engine body, install air inlet control device on the air inlet pipe, arrange on the engine body and install parameter detection device, gas air feeder the oxygen injection device with parameter detection device be connected to respectively install in the automatically controlled unit ECU on the engine body, automatically controlled unit ECU still be connected to install in ignition coil on the engine body.
As an optimized technical scheme, the oxygen injection device comprises a high-pressure oxygen storage device, the high-pressure oxygen storage device is connected to the second mixer through an oxygen supply pipe, an oxygen pressure regulating valve, a one-way valve, an oxygen temperature pressure sensor and an oxygen injection control valve are sequentially connected in series on the oxygen supply pipe along the oxygen advancing direction, and the oxygen temperature pressure sensor and the oxygen injection control valve are respectively connected to the electronic control unit ECU.
As an optimized technical scheme, the gas supply device comprises a gas supply pipe connected between a natural gas source and the first mixer, and a gas control valve and a gas temperature pressure sensor are sequentially connected in series on the gas supply pipe along the natural gas advancing direction, and the gas control valve and the gas temperature pressure sensor are respectively connected to the Electronic Control Unit (ECU).
As a preferable technical scheme, the air inlet control device comprises an electronic throttle valve and an air inlet temperature pressure sensor which are sequentially connected in series along the air travelling direction on the air inlet pipeline, and the electronic throttle valve and the air inlet temperature pressure sensor are respectively connected to the electronic control unit ECU.
As a preferable technical scheme, the parameter detection device includes an oxygen sensor mounted at an exhaust end of the engine body, a water temperature sensor for detecting a water temperature of the engine body, a rotational speed sensor for detecting a rotational speed of the engine body, and an oil pressure sensor for detecting an oil pressure in the engine body, and the oxygen sensor, the water temperature sensor, the rotational speed sensor, and the oil pressure sensor are respectively connected to the electronic control unit ECU.
The invention also discloses a low-emission control strategy of the self-priming engine for the natural gas generator set, which comprises the following steps,
step one, standard parameter formation
Setting the closing rate of the oxygen injection control valve in the electronic control unit ECU, and setting a minimum pressure value Ymin of oxygen transmission in the oxygen transmission pipe, a water temperature high limit value, an engine oil pressure low limit value and an engine oil pressure high limit value in the running process of an engine;
the bench test is used for being matched with the electronic control unit ECU to obtain a closed-loop correction table A1 of the engine and an ignition angle setting table Z1 of the ignition coil when the engine runs abnormally; in addition, when the engine normally operates, a closed-loop correction table A0 of the engine and an ignition angle setting table Z0 of the ignition coil are obtained;
step two, judging the engine state
The electronic control unit ECU receives the measured values and state information of the gas temperature pressure sensor, the oxygen sensor, the water temperature sensor, the rotating speed sensor, the engine oil pressure sensor and the air inlet temperature pressure sensor in real time, receives the opening values and state information of the gas control valve, the oxygen injection control valve and the electronic throttle valve in real time, and receives the state information of the ignition coil and the electronic control unit ECU in real time; the electronic control unit ECU can receive the information and judge that the information is effective, and then the engine is judged to be normal in operation; any information can not be received by the electronic control unit ECU, or the information judgment is invalid, and the engine operation abnormality is judged;
step three, engine operation abnormality control strategy
The electronic control unit ECU triggers corresponding alarm information, prompts alarm fault codes, judges non-stop faults or stop faults according to the fault codes, and operates corresponding strategies according to fault properties;
non-shutdown failure: the electronic control unit ECU cannot give a control instruction to the oxygen injection control valve, cannot receive a feedback signal of the oxygen injection control valve, cannot receive detection information of the oxygen temperature pressure sensor, detects that an actual conveying pressure value of oxygen in the oxygen supply pipe is smaller than a minimum pressure value Ymin and the oxygen sensor fails, and judges that the electronic control unit ECU fails to stop;
non-shutdown failure strategy: the electronic control unit ECU controls the oxygen injection control valve not to be opened, and if the oxygen injection control valve is in an opened state when a fault occurs, the electronic control unit ECU controls the oxygen injection control valve to be closed according to the set closing rate; the oxygen sensor detects the oxygen ion concentration in the exhaust gas of the engine body and transmits the oxygen ion concentration to the electric control unit ECU, the electric control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A1, meanwhile, the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electric control unit ECU, the electric control unit ECU processes the opening degree correction signals for forming the gas control valve to correct the opening degree of the gas control valve, if the oxygen sensor fails, the electric control unit ECU executes air-fuel ratio open-loop control, the gas control valve executes opening degree according to data set in the electric control unit ECU, and in addition, the electric control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z1 according to the information;
shutdown failure: the electronic control unit ECU receives detection signals of the water temperature sensor and the oil pressure sensor, correspondingly compares the detection signals with the preset water temperature high limit value, the preset oil pressure low limit value and the preset oil pressure high limit value, and judges that the electronic control unit ECU stops working when the water temperature detection value is higher than the water temperature high limit value, the oil pressure detection value is lower than the oil pressure low limit value or/and the oil pressure detection value is higher than the oil pressure high limit value;
shutdown fault strategy: the electronic control unit ECU controls the gas control valve, the oxygen injection control valve and the ignition coil to be respectively closed, and the engine is stopped;
step four, engine operation normal control strategy
Detecting temperature and pressure information of the air inlet pipeline through the air inlet temperature and pressure sensor, processing and calculating the received information by the electronic control unit ECU to obtain the load of the engine, and selecting an operation control strategy according to the load;
when the engine load is less than 70%, the electronic control unit ECU controls the oxygen injection control valve not to be opened, controls the gas control valve to be opened, namely, the oxygen sensor detects the concentration of oxygen ions in the exhaust gas of the engine body and transmits the oxygen ions to the electronic control unit ECU, the electronic control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A0, simultaneously the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electronic control unit ECU, the electronic control unit ECU processes the opening degree correction signals for forming the gas control valve to correct the opening degree of the gas control valve, and in addition, the electronic control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z0 according to the information;
when the engine load is 70 percent or less and 100 percent or less, the electronic control unit ECU controls the oxygen injection control valve to be opened, and controls the fuel gas control valve to be opened, namely, the electronic control unit ECU controls the opening of the oxygen injection control valve according to the calculated actual load of the engine, the load is in direct proportion to the opening of the oxygen injection control valve, and the opening correction signal of the oxygen injection control valve is formed through the detection information of the water temperature sensor and the oxygen temperature pressure sensor under the cooperation of the electronic control unit ECU, so as to form opening correction for the oxygen injection control valve; the oxygen sensor detects the oxygen ion concentration in the exhaust gas of the engine body and transmits the oxygen ion concentration to the electronic control unit ECU, the electronic control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A0, meanwhile, the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electronic control unit ECU, the electronic control unit ECU processes the opening degree correction signals to form the gas control valve, the opening degree of the gas control valve is corrected, and in addition, the electronic control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z0 according to the information.
As an improvement of the above technical solution, in the third step, when the oxygen sensor fails, the execution parameter set in the ECU is that the opening degree of the gas control valve is K2, the opening degree of the oxygen injection control valve is J2, and the actual ignition advance angle of the ignition coil is Z2.
Due to the adoption of the technical scheme, the invention has the following technical effects: the engine is used as a common power device, the average load is higher, the engine is generally operated for 24 hours under the load of 70% -80%, the oxygen content in the cylinder is increased by injecting pure oxygen in the air inlet pipeline, the exhaust quantity of the engine is not changed, the engine power performance and economy are improved, the emission is not deteriorated, the method is stronger than the method of simply increasing the air quantity under the condition of keeping the same cylinder pressure, the engine can perform oxygen-enriched and low-nitrogen combustion under the condition of large-load operation, and the NO of the engine can be effectively reduced x The emission and the ignition advance angle of the engine can be further increased under the condition of oxygen-enriched combustion so as to improve the combustion efficiency of the engine, and the oxygen injection quantity is controlled to be supplied according to the load of the engine, so that the aim of rapidly improving the thermal efficiency of the engine is fulfilled, and meanwhile, the low-emission reconstruction cost of the engine can be effectively reduced.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a workflow diagram of an embodiment of the present invention;
in the figure: 1-an air cleaner; 2-a first mixer; 3-a second mixer; 4-a natural gas source; 5-an air supply pipe; 6-a gas control valve; 7-a gas temperature and pressure sensor; 8-a high pressure oxygen reservoir; 9-an oxygen supply pipe; 10-an oxygen pressure regulating valve; 11-a one-way valve; 12-an oxygen temperature and pressure sensor; 13-oxygen injection control valve; 14-an air inlet pipeline; 15-an engine block; 16-an electronic throttle; 17-an intake air temperature and pressure sensor; 18-an electronic control unit ECU; a 19-oxygen sensor; 20-a water temperature sensor; 21-a rotation speed sensor; 22-an engine oil pressure sensor; 23-exhaust pipe; 24-ignition coil.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
As shown in fig. 1, the self-priming engine for the natural gas generator set comprises a first mixer 2 provided with an air inlet, namely, the air inlet of the first mixer 2 is connected with an air filter 1 for conveying fresh air into the first mixer 2, the other air inlet of the first mixer 2 is connected with a gas supply device, the gas outlet of the first mixer 2 is connected to the air inlet of a second mixer 3 through a pipeline, and the other air inlet of the second mixer 3 is connected with an oxygen injection device. The first mixer 2 and the second mixer 3 are respectively provided with two air inlets and one air outlet, wherein the first mixer 2 is used for mixing air and natural gas, and the second mixer 3 is used for injecting pure oxygen into the mixed gas of air and natural gas so as to improve the oxygen content in the gas fuel.
Specifically, the gas supply device comprises a gas supply pipe 5 connected between the natural gas source 4 and the first mixer 2, and the gas supply pipe 5 is sequentially connected with a gas control valve 6 and a gas temperature pressure sensor 7 in series along the natural gas travelling direction. The gas control valve 6 is controlled by a control part of the engine, the feeding amount of the natural gas is controlled by the opening size of the valve, and the gas temperature and pressure sensor 7 is used for measuring the temperature and the pressure of the natural gas in real time and transmitting signals to the control part of the engine operation. The oxygen injection device comprises a high-pressure oxygen storage device 8, the high-pressure oxygen storage device 8 can be arranged into an oxygen storage bottle, an oxygen storage tank and the like, the high-pressure oxygen storage device 8 is connected to the second mixer 3 through an oxygen supply pipe 9, an oxygen pressure regulating valve 10, a one-way valve 11, an oxygen temperature pressure sensor 12 and an oxygen injection control valve 13 are sequentially connected in series on the oxygen supply pipe 9 along the oxygen travelling direction, and the oxygen pressure regulating valve 10 and the oxygen injection control valve 13 are controlled by a control part of an engine. The oxygen pressure regulating valve 10 is used for regulating the oxygen delivery pressure to control the oxygen delivery pressure within an allowable range, the check valve 11 can prevent the oxygen pipeline from generating back air, and the oxygen injection control valve 13 can control the oxygen delivery amount.
The air outlet of the second mixer 3 is connected to the engine body 15 through an air inlet pipeline 14, and an air inlet control device is installed on the air inlet pipeline 14. The air inlet control device comprises an electronic throttle valve 16 and an air inlet temperature pressure sensor 17 which are sequentially connected in series on the air inlet pipeline 14 along the air travelling direction. The engine operating load can be controlled by the electronic throttle 16, and the intake air temperature and pressure sensor 17 is used for measuring the temperature and pressure of the mixture in the intake pipe 14 and transmitting to the control part of the engine for engine operating load control or regulation.
The engine body 15 is provided with a parameter detection device, the gas supply device, the oxygen injection device, the air intake control device and the parameter detection device are respectively connected to an electronic control unit ECU18 installed on the engine body 15, and the electronic control unit ECU18 is a control part of the engine, so that the gas control valve 6, the gas temperature pressure sensor 7, the oxygen temperature pressure sensor 12, the oxygen injection control valve 13, the electronic throttle valve 16 and the air intake temperature pressure sensor 17 are respectively connected to the electronic control unit ECU18. The parameter detection device comprises an oxygen sensor 19 installed at the exhaust end of the engine body 15, a water temperature sensor 20 for detecting the water temperature of the engine body 15, a rotation speed sensor 21 for detecting the rotation speed of the engine body 15 and an engine oil pressure sensor 22 for detecting the engine oil pressure in the engine body 15, wherein the oxygen sensor 19, the water temperature sensor 20, the rotation speed sensor 21 and the engine oil pressure sensor 22 are respectively connected to the electronic control unit ECU18. The exhaust end of the engine body 15 is provided with an exhaust pipe 23, the oxygen sensor 19 is mounted on the exhaust pipe 23 and is used for detecting the oxygen concentration in the exhaust pipe 23, the water temperature sensor 20 is used for detecting the temperature of cooling water in the engine body 15, the rotation speed sensor 21 is used for measuring the rotation speed of the engine body 15, and the oil pressure sensor 22 is used for measuring the oil pressure in the engine body 15. The electronic control unit ECU18 is also connected to an ignition coil 24 mounted on the engine block 15 for controlling ignition of the engine block 15.
Pure oxygen is injected into the air inlet pipeline 14, the injection quantity of the oxygen is controlled by the electronic control unit ECU18, the content of the oxygen entering the cylinder of the engine body 15 is increased, the exhaust quantity of the engine body 15 is not changed, the overall power performance and economy of the engine are improved, the emission is not deteriorated, and the method has stronger power performance under the condition of keeping the same cylinder pressure compared with the condition of simply increasing the air quantity. The oxygen increasing of the non-supercharged engine is used, so that the enhanced combustion effect of the engine is realized, and the aim of rapidly improving the heat efficiency of the engine is fulfilled. The embodiment is especially suitable for self-priming natural gas engine products below 200kW, and can effectively reduce NO on low-emission control of the engine x The fuel economy of the engine with large load is improved, and the low-emission reconstruction cost of the engine can be effectively reduced.
Under normal environmental conditions, the two most critical factors for controlling engine emissions are the air-fuel ratio of the engine and the ignition advance angle of the engine, which is regulated and controlled by the ECU18 according to the actual load, rotation speed, water temperature, etc. of the engine. The air-fuel ratio is controlled by adjusting the ratio of fuel gas and air entering the engine, and the air-fuel ratio adjustment of the present embodiment is achieved by controlling the fuel gas control valve 6 and the oxygen injection control valve 13. In this embodiment, the opening degrees of the gas control valve 6 and the oxygen injection control valve 13, and the ignition angle of the ignition coil 24 are key to achieving low emission control of the engine.
The embodiment also discloses a low emission control strategy of the self-priming engine for the natural gas generator set, which is shown in combination with fig. 2 and comprises the following steps:
step one, standard parameter formation
The closing rate of the oxygen injection control valve 13 is set in the electronic control unit ECU18, the minimum pressure value Ymin of oxygen delivery in the oxygen delivery pipe 9, the water temperature high limit value, the engine oil pressure low limit value and the engine oil pressure high limit value in the running process of the engine are used as reference standard values for comparison with the detection values, and corresponding adjustment measures are adopted according to the comparison result to adjust the working state of the engine.
Acquiring a closed-loop correction table A1 of the engine and an ignition angle setting table Z1 of the ignition coil 24 when the engine runs abnormally by using a bench test and matching with the electronic control unit ECU 18; in addition, when the engine is operating normally, the closed-loop correction table A0 of the engine and the ignition angle setting table Z0 of the ignition coil 24 are obtained, and the method for obtaining the air-fuel ratio closed-loop table and the ignition advance table by using the bench test is well known to those skilled in the art, and will not be described in detail herein.
Step two, judging the engine state
The electronic control unit ECU18 receives the measured values and state information of the gas temperature pressure sensor 7, the oxygen temperature pressure sensor 12, the oxygen sensor 19, the water temperature sensor 20, the rotation speed sensor 21, the engine oil pressure sensor 22 and the intake air temperature pressure sensor 17 in real time, receives the opening values and state information of the gas control valve 6, the oxygen injection control valve 13 and the electronic throttle valve 16 in real time, and receives the state information of the ignition coil 24 and the electronic control unit ECU18 itself in real time; the electronic control unit ECU18 can receive the above information and judge that the information is valid, and then judge that the engine is running normally; if any of the above information is not received by the ECU18 or if the information is determined to be invalid, the engine operation is determined to be abnormal. The ECU18 determines whether the engine operation state is normal or not, and takes corresponding measures.
Step three, engine operation abnormality control strategy
The electronic control unit ECU18 triggers corresponding alarm information to prompt an alarm fault code, and judges a non-stop fault or a stop fault according to the fault code, and the electronic control unit ECU18 operates corresponding strategies according to fault properties.
Non-shutdown failure: the electronic control unit ECU18 cannot issue a control command to the oxygen injection control valve 13, the electronic control unit ECU18 cannot receive a feedback signal of the oxygen injection control valve 13, the electronic control unit ECU18 cannot receive detection information of the oxygen temperature pressure sensor 12, an actual delivery pressure value of oxygen in the oxygen delivery pipe 9 detected by the oxygen temperature pressure sensor 12 is less than a minimum pressure value Ymin, and when the oxygen sensor fails, the electronic control unit ECU18 determines that the oxygen sensor fails.
Non-shutdown failure strategy: the electronic control unit ECU18 controls the oxygen injection control valve 13 not to be opened, and if the oxygen injection control valve 13 is in an opened state when a fault occurs, the electronic control unit ECU18 controls the oxygen injection control valve 13 to be closed according to the set closing rate; the oxygen sensor 19 detects the oxygen ion concentration in the exhaust gas of the engine body 15, and transmits the detected oxygen ion concentration to the electric control unit ECU18, the electric control unit ECU18 performs air-fuel ratio closed-loop control, and makes the gas control valve 6 perform opening according to the closed-loop correction table A1, and the gas temperature pressure sensor 7 detects the temperature and pressure signals of the natural gas in the gas supply pipe 5 in real time, and transmits the detected temperature and pressure signals to the electric control unit ECU18, the electric control unit ECU18 processes the opening correction signal forming the gas control valve 6, corrects the opening of the gas control valve 6, and if the oxygen sensor 19 fails, the electric control unit ECU18 performs air-fuel ratio open-loop control, and the gas control valve 6 performs opening according to data set inside the electric control unit ECU18, and in addition, the electric control unit ECU18 controls the ignition coil 24 to perform ignition operation according to the ignition angle setting table Z1 according to the above information.
Shutdown failure: the ECU18 receives the detection signals of the water temperature sensor 20 and the oil pressure sensor 22, and compares the detection signals with the preset water temperature high limit value, the preset oil pressure low limit value, and the preset oil pressure high limit value, and when the detection value of the water temperature is higher than the water temperature high limit value, the detection value of the oil pressure is lower than the oil pressure low limit value, or/and the detection value of the oil pressure is higher than the oil pressure high limit value, the ECU18 determines that the vehicle is stopped.
Shutdown fault strategy: the electronic control unit ECU18 controls the gas control valve 6, the oxygen injection control valve 13 and the ignition coil 24 to be closed respectively, and the engine is stopped.
In the engine control process, finally, by the control of the electronic control unit ECU18, the actual opening degree of the gas control valve 6 is K2, the actual opening degree of the oxygen injection valve 13 is J2, the actual ignition angle of the ignition coil 24 is Z2, and the three values are parameters finally formed by the engine according to the actual running conditions.
Step four, engine operation normal control strategy
The temperature and pressure information of the intake pipe 14 is detected by the intake temperature and pressure sensor 17, and the electronic control unit ECU18 processes and calculates the received information to obtain the load of the engine, and selects an operation control strategy according to the load.
When the engine load is less than 70%, the electronic control unit ECU18 controls the oxygen injection control valve 13 not to be opened, controls the gas control valve 6 to be opened, namely, the oxygen sensor 19 detects the oxygen ion concentration in the exhaust gas of the engine body 15 and transmits the oxygen ion concentration to the electronic control unit ECU18, the electronic control unit ECU18 realizes air-fuel ratio closed-loop control, and enables the gas control valve 6 to execute opening degree according to the closed-loop correction table A0, meanwhile, the gas temperature pressure sensor 7 detects the temperature and pressure signals of the natural gas in the gas supply pipe 5 in real time and transmits the signals to the electronic control unit ECU18, the electronic control unit ECU18 processes the opening degree correction signals forming the gas control valve 6 to correct the opening degree of the gas control valve 6, and in addition, the electronic control unit ECU18 controls the ignition coil 24 to execute ignition action according to the ignition angle setting table Z0 according to the information;
when the engine load is 70% or less and 100% or less, the electronic control unit ECU18 controls the oxygen injection control valve 13 to open and controls the fuel gas control valve 6 to open, that is, the electronic control unit ECU18 controls the opening of the oxygen injection control valve 13 according to the calculated actual load of the engine, and the load is proportional to the opening of the oxygen injection control valve 13, that is, the greater the load is, the greater the opening of the oxygen injection control valve 13 is, the smaller the load is, the smaller the opening of the oxygen injection control valve 13 is, the greater the opening of the oxygen injection control valve 13 is, the lower the rotation speed is, and the smaller the opening of the oxygen injection control valve 13 is. And the opening correction signal of the oxygen injection control valve 13 is formed by the detection information of the water temperature sensor 20 and the oxygen temperature pressure sensor 12 in cooperation with the electronic control unit ECU18, and the opening correction is formed for the oxygen injection control valve 13. The oxygen sensor 19 detects the oxygen ion concentration in the exhaust gas of the engine body 15, and transmits the oxygen ion concentration to the electric control unit ECU18, the electric control unit ECU18 realizes air-fuel ratio closed-loop control, and makes the gas control valve 6 execute opening degree according to the closed-loop correction table A0, meanwhile, the gas temperature pressure sensor 7 detects the temperature and pressure signals of the natural gas in the gas pipe 5 in real time, and transmits the signals to the electric control unit ECU18, the electric control unit ECU18 processes the opening degree correction signals forming the gas control valve 6, corrects the opening degree of the gas control valve 6, and in addition, the electric control unit ECU18 controls the ignition coil 24 to execute ignition action according to the ignition angle setting table Z0 according to the information.
In this step, when the oxygen sensor fails, the opening degree of the gas control valve, the opening degree of the oxygen injection control valve, and the actual ignition advance angle of the ignition coil are determined in the same manner as in step three.
The engine is used as common power equipment, the average load is higher, the engine is generally operated for 24 hours under 70-80% of load, the embodiment aims at the operating characteristics of the engine, and the oxygen supply control is carried out for the load (more than 70% of load) with longer specific operating time, so that the engine can carry out oxygen-enriched and low-nitrogen combustion under the condition of large-load operation, and the NO of the engine can be effectively reduced x And the engine can be further increased under the condition of oxygen-enriched combustionThe ignition advance angle improves the combustion efficiency of the engine, and the supply amount is controlled according to the actual load of the engine. In this embodiment, the oxygen is used only when the engine is operated at a large load, and if the engine is operated at a small load, the oxygen supply is not performed. When the oxygen pressure of the engine is insufficient, the engine can work normally, and the closed-loop operation is carried out under the condition that the lambda closed-loop correction table A1 and the ignition angle setting table Z1 are taken as the reference, so that the shutdown caused by the replacement of an oxygen cylinder or the failure of the feeding equipment can be avoided.
The foregoing has shown and described the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a low emission control strategy of self-priming engine for natural gas generating set, is including the first blender that is equipped with the air inlet, its characterized in that: the other air inlet of the first mixer is connected with a gas supply device, the air outlet of the first mixer is connected to the air inlet of the second mixer through a pipeline, the other air inlet of the second mixer is connected with an oxygen injection device, the air outlet of the second mixer is connected to an engine body through an air inlet pipeline, an air inlet control device is arranged on the air inlet pipeline, a parameter detection device is arranged on the engine body, and the gas supply device, the oxygen injection device, the air inlet control device and the parameter detection device are respectively connected to an electronic control unit ECU (electronic control unit) arranged on the engine body, and the electronic control unit ECU is also connected to an ignition coil arranged on the engine body;
the oxygen injection device comprises a high-pressure oxygen storage device which is connected to the second mixer through an oxygen supply pipe, an oxygen pressure regulating valve, a one-way valve, an oxygen temperature pressure sensor and an oxygen injection control valve are sequentially connected in series on the oxygen supply pipe along the oxygen travelling direction, and the oxygen temperature pressure sensor and the oxygen injection control valve are respectively connected to the electronic control unit ECU;
the gas supply device comprises a gas supply pipe connected between a natural gas source and the first mixer, a gas control valve and a gas temperature pressure sensor are sequentially connected in series on the gas supply pipe along the natural gas advancing direction, and the gas control valve and the gas temperature pressure sensor are respectively connected to the electronic control unit ECU;
the air inlet control device comprises an electronic throttle valve and an air inlet temperature pressure sensor which are sequentially connected in series along the air travelling direction on the air inlet pipeline, and the electronic throttle valve and the air inlet temperature pressure sensor are respectively connected to the electronic control unit ECU;
the parameter detection device comprises an oxygen sensor, a water temperature sensor, a rotating speed sensor and an engine oil pressure sensor, wherein the oxygen sensor is arranged at an exhaust end of the engine body, the water temperature sensor is used for detecting the water temperature of the engine body, the rotating speed sensor is used for detecting the rotating speed of the engine body, the engine oil pressure sensor is used for detecting the engine oil pressure in the engine body, and the oxygen sensor, the water temperature sensor, the rotating speed sensor and the engine oil pressure sensor are respectively connected to the electronic control unit ECU;
the strategy comprises the steps of,
step one, standard parameter formation
Setting the closing rate of the oxygen injection control valve in the electronic control unit ECU, and setting a minimum pressure value Ymin of oxygen transmission in the oxygen transmission pipe, a water temperature high limit value, an engine oil pressure low limit value and an engine oil pressure high limit value in the running process of an engine;
the bench test is used for being matched with the electronic control unit ECU to obtain a closed-loop correction table A1 of the engine and an ignition angle setting table Z1 of the ignition coil when the engine runs abnormally; in addition, when the engine normally operates, a closed-loop correction table A0 of the engine and an ignition angle setting table Z0 of the ignition coil are obtained;
step two, judging the engine state
The electronic control unit ECU receives the measured values and state information of the gas temperature pressure sensor, the oxygen sensor, the water temperature sensor, the rotating speed sensor, the engine oil pressure sensor and the air inlet temperature pressure sensor in real time, receives the opening values and state information of the gas control valve, the oxygen injection control valve and the electronic throttle valve in real time, and receives the state information of the ignition coil and the electronic control unit ECU in real time; the electronic control unit ECU can receive the information and judge that the information is effective, and then the engine is judged to be normal in operation; any information can not be received by the electronic control unit ECU, or the information judgment is invalid, and the engine operation abnormality is judged;
step three, engine operation abnormality control strategy
The electronic control unit ECU triggers corresponding alarm information, prompts alarm fault codes, judges non-stop faults or stop faults according to the fault codes, and operates corresponding strategies according to fault properties;
non-shutdown failure: the electronic control unit ECU cannot give a control instruction to the oxygen injection control valve, cannot receive a feedback signal of the oxygen injection control valve, cannot receive detection information of the oxygen temperature pressure sensor, detects that an actual conveying pressure value of oxygen in the oxygen supply pipe is smaller than a minimum pressure value Ymin and the oxygen sensor fails, and judges that the electronic control unit ECU fails to stop;
non-shutdown failure strategy: the electronic control unit ECU controls the oxygen injection control valve not to be opened, and if the oxygen injection control valve is in an opened state when a fault occurs, the electronic control unit ECU controls the oxygen injection control valve to be closed according to the set closing rate; the oxygen sensor detects the oxygen ion concentration in the exhaust gas of the engine body and transmits the oxygen ion concentration to the electric control unit ECU, the electric control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A1, meanwhile, the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electric control unit ECU, the electric control unit ECU processes the opening degree correction signals for forming the gas control valve to correct the opening degree of the gas control valve, if the oxygen sensor fails, the electric control unit ECU executes air-fuel ratio open-loop control, the gas control valve executes opening degree according to data set in the electric control unit ECU, and in addition, the electric control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z1 according to the information;
shutdown failure: the electronic control unit ECU receives detection signals of the water temperature sensor and the oil pressure sensor, correspondingly compares the detection signals with the preset water temperature high limit value, the preset oil pressure low limit value and the preset oil pressure high limit value, and judges that the electronic control unit ECU stops working when the water temperature detection value is higher than the water temperature high limit value, the oil pressure detection value is lower than the oil pressure low limit value or/and the oil pressure detection value is higher than the oil pressure high limit value;
shutdown fault strategy: the electronic control unit ECU controls the gas control valve, the oxygen injection control valve and the ignition coil to be respectively closed, and the engine is stopped;
step four, engine operation normal control strategy
Detecting temperature and pressure information of the air inlet pipeline through the air inlet temperature and pressure sensor, processing and calculating the received information by the electronic control unit ECU to obtain the load of the engine, and selecting an operation control strategy according to the load;
when the engine load is less than 70%, the electronic control unit ECU controls the oxygen injection control valve not to be opened, controls the gas control valve to be opened, namely, the oxygen sensor detects the concentration of oxygen ions in the exhaust gas of the engine body and transmits the oxygen ions to the electronic control unit ECU, the electronic control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A0, simultaneously the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electronic control unit ECU, the electronic control unit ECU processes the opening degree correction signals for forming the gas control valve to correct the opening degree of the gas control valve, and in addition, the electronic control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z0 according to the information;
when the engine load is 70 percent or less and 100 percent or less, the electronic control unit ECU controls the oxygen injection control valve to be opened, and controls the fuel gas control valve to be opened, namely, the electronic control unit ECU controls the opening of the oxygen injection control valve according to the calculated actual load of the engine, the load is in direct proportion to the opening of the oxygen injection control valve, and the opening correction signal of the oxygen injection control valve is formed through the detection information of the water temperature sensor and the oxygen temperature pressure sensor under the cooperation of the electronic control unit ECU, so as to form opening correction for the oxygen injection control valve; the oxygen sensor detects the oxygen ion concentration in the exhaust gas of the engine body and transmits the oxygen ion concentration to the electronic control unit ECU, the electronic control unit ECU realizes air-fuel ratio closed-loop control, the gas control valve executes opening degree according to the closed-loop correction table A0, meanwhile, the gas temperature pressure sensor detects the temperature and pressure signals of natural gas in the gas supply pipe in real time and transmits the signals to the electronic control unit ECU, the electronic control unit ECU processes the opening degree correction signals to form the gas control valve, the opening degree of the gas control valve is corrected, and in addition, the electronic control unit ECU controls the ignition coil to execute ignition action according to the ignition angle setting table Z0 according to the information.
2. The low emission control strategy of a self-priming engine for a natural gas generator set of claim 1, wherein: in the third step, when the oxygen sensor fails, the execution parameters set in the electronic control unit ECU are that the opening degree of the gas control valve is K2, the opening degree of the oxygen injection control valve is J2, and the actual ignition advance angle of the ignition coil is Z2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910855930.8A CN110500204B (en) | 2019-09-11 | 2019-09-11 | Self-priming engine for natural gas generator set and low-emission control strategy thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910855930.8A CN110500204B (en) | 2019-09-11 | 2019-09-11 | Self-priming engine for natural gas generator set and low-emission control strategy thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110500204A CN110500204A (en) | 2019-11-26 |
| CN110500204B true CN110500204B (en) | 2023-08-15 |
Family
ID=68591712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910855930.8A Active CN110500204B (en) | 2019-09-11 | 2019-09-11 | Self-priming engine for natural gas generator set and low-emission control strategy thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110500204B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115306571B (en) * | 2022-07-06 | 2024-05-17 | 潍柴动力股份有限公司 | Control method and control system for nitrogen oxide emission of gas engine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503983A (en) * | 2009-03-11 | 2009-08-12 | 天津大学 | Pure oxygen air-intake oxygen-enriched combustion control method and control system for internal combustion engine |
| KR20110045205A (en) * | 2009-10-26 | 2011-05-04 | 삼성중공업 주식회사 | Fuel supply of diesel engine |
| CN103184955A (en) * | 2011-12-30 | 2013-07-03 | 王正铉 | Novel and efficient automobile energy-saving and emission reduction device-oxygen adding optimized air-fuel ratio device |
| CN103277219A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Oxygen-fired zero-valve two-stroke efficient micro-emission internal combustion engine |
| CN103362668A (en) * | 2012-03-26 | 2013-10-23 | 福特环球技术公司 | Method and apparatus for injecting oxygen within an engine |
| CN105257372A (en) * | 2015-11-04 | 2016-01-20 | 王立臣 | Multi-oxygen engine and using method thereof |
| CN210422807U (en) * | 2019-09-11 | 2020-04-28 | 潍柴西港新能源动力有限公司 | Self-suction engine for natural gas generator set |
-
2019
- 2019-09-11 CN CN201910855930.8A patent/CN110500204B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503983A (en) * | 2009-03-11 | 2009-08-12 | 天津大学 | Pure oxygen air-intake oxygen-enriched combustion control method and control system for internal combustion engine |
| KR20110045205A (en) * | 2009-10-26 | 2011-05-04 | 삼성중공업 주식회사 | Fuel supply of diesel engine |
| CN103184955A (en) * | 2011-12-30 | 2013-07-03 | 王正铉 | Novel and efficient automobile energy-saving and emission reduction device-oxygen adding optimized air-fuel ratio device |
| CN103362668A (en) * | 2012-03-26 | 2013-10-23 | 福特环球技术公司 | Method and apparatus for injecting oxygen within an engine |
| CN103277219A (en) * | 2013-05-31 | 2013-09-04 | 中国人民解放军理工大学 | Oxygen-fired zero-valve two-stroke efficient micro-emission internal combustion engine |
| CN105257372A (en) * | 2015-11-04 | 2016-01-20 | 王立臣 | Multi-oxygen engine and using method thereof |
| CN210422807U (en) * | 2019-09-11 | 2020-04-28 | 潍柴西港新能源动力有限公司 | Self-suction engine for natural gas generator set |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110500204A (en) | 2019-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3409915B1 (en) | System and method for improving performance of combustion engines employing primary and secondary fuels | |
| US8958971B2 (en) | System and method to control an electronically-controlled turbocharger | |
| US9194307B2 (en) | Multi-fuel flow systems and methods with dedicated exhaust gas recirculation | |
| US20150219027A1 (en) | Cylinder pressure based control of dual fuel engines | |
| US9334812B2 (en) | Fuel supply control system for multi-fuel internal combustion engine | |
| WO2011102781A1 (en) | Arrangement and method for reducing nitrogen oxides in exhaust gases from a combustion engine | |
| CN112855358A (en) | Special gas engine control system for gas heat pump | |
| US20150337720A1 (en) | Control method for variable geometry exhaust turbine | |
| CN110259586A (en) | A kind of diesel engine cylinder deactivation gas path control method | |
| CN110230538A (en) | A kind of diesel oil ignited unit and its progress control method | |
| CN110500204B (en) | Self-priming engine for natural gas generator set and low-emission control strategy thereof | |
| US20170204792A1 (en) | Ventilation controls for dual-fuel engines | |
| CN108180071A (en) | A kind of gas handling system suitable for Incylinder direct injection hydrogen internal combustion engine | |
| CN210422807U (en) | Self-suction engine for natural gas generator set | |
| CN116324141B (en) | Diesel engines | |
| CN110905694B (en) | Injection control method of dual fuel injection system for natural gas engine | |
| CN108869107A (en) | After-treatment device heat management system and method based on cold and hot EGR joint supply | |
| CN110594026B (en) | Low-pressure gas supercharged engine operation mode switching device and switching control method thereof | |
| CN114991952B (en) | Dual-fuel supply system and automobile | |
| CN210714846U (en) | Diesel ignition unit | |
| CN211008898U (en) | Fuel double-injection system for natural gas engine | |
| CN210622929U (en) | Low-pressure gas supercharged engine running mode switching device | |
| CN209704729U (en) | A kind of double-fuel diesel engine oil circuit improvement structure | |
| CN113756945A (en) | Self-adaptive control method of internal combustion engine for power generation suitable for multiple gas sources | |
| US10526986B2 (en) | Systems and methods for controlling EGR flow rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |