CN110700954A - Liquid dual-fuel medium-speed diesel engine system and speed regulation control method thereof - Google Patents

Liquid dual-fuel medium-speed diesel engine system and speed regulation control method thereof Download PDF

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Publication number
CN110700954A
CN110700954A CN201911049222.1A CN201911049222A CN110700954A CN 110700954 A CN110700954 A CN 110700954A CN 201911049222 A CN201911049222 A CN 201911049222A CN 110700954 A CN110700954 A CN 110700954A
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speed
rotating speed
methanol
fuel
oil
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Inventor
吴亦宁
陈诚
文波
郑永强
薛良君
宣俊才
杨青青
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CRRC Qishuyan Co Ltd
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CSR Qishuyan Co Ltd
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Priority to CN201911049222.1A priority Critical patent/CN110700954A/en
Publication of CN110700954A publication Critical patent/CN110700954A/en
Priority to PCT/CN2020/109415 priority patent/WO2021082638A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/066—Retrofit of secondary fuel supply systems; Conversion of engines to operate on multiple fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention relates to the technical field of medium-speed diesel engines, in particular to a liquid dual-fuel medium-speed diesel engine system and a speed regulation control method thereof. The liquid dual-fuel medium-speed diesel engine system comprises a microcomputer, a diesel oil supply and control loop and a methanol supply and control loop, wherein the microcomputer is respectively connected with the diesel oil supply and control loop and the methanol supply and control loop, and the diesel oil supply and control loop and the methanol supply and control loop are mutually independent. The liquid dual-fuel medium-speed diesel engine system adopts methanol as a liquid fuel, can be stored and filled at normal temperature and normal pressure, is convenient and quick and is not easy to leak. Meanwhile, the flash point of the methanol is about 10 ℃ and is far higher than that of the gas fuel, so that the methanol fuel is safer, and the engine controlled by the speed regulation control method has stable rotating speed output power and stable speed regulation process in the working process.

Description

Liquid dual-fuel medium-speed diesel engine system and speed regulation control method thereof
Technical Field
The invention relates to a liquid dual-fuel medium-speed diesel engine, in particular to a liquid dual-fuel medium-speed diesel engine system and a speed regulation control method thereof.
Background
The dual fuel technology of diesel engines mainly surrounds combustible gas fuels such as natural gas, liquefied petroleum gas, methane and the like.
The gas dual fuel technology mainly has the following problems:
1. the energy density is low, and the storage space is large;
2. the pressurized transportation, storage and filling have high use cost and high leakage risk;
3. the leakage is easy to mix with air and the explosion is caused by ignition, so that the potential safety hazard exists.
The speed regulation control of the liquid dual-fuel diesel engine on the small diesel engine usually adopts a control method of an active throttle and a follow-up throttle, namely, a driver directly controls a diesel throttle through an operating device, and a liquid fuel control system determines the injection quantity of liquid fuel according to the rotating speed and the oil supply quantity of the active throttle.
The dual-fuel diesel engine adopting combustible liquid fuel is rare in the field of large-cylinder-diameter medium-speed diesel engines, namely medium-speed diesel engines larger than 250mm, because the large-cylinder-diameter medium-speed diesel engine works at a stable rotating speed under the PID control of a speed regulator, because the inertia of a moving part is large, the speed regulation process is slow, the system is stable for a long time, the speed regulation process can be increased along with an accelerator, and the long speed regulation process can cause unstable factors in speed regulation.
Disclosure of Invention
The invention aims to solve the defects and provides a liquid dual-fuel medium-speed diesel engine system and a speed regulation control method thereof.
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: the liquid dual-fuel medium-speed diesel engine system comprises a microcomputer, a diesel oil supply and control loop and a methanol supply and control loop, and is characterized in that the microcomputer is respectively connected with the diesel oil supply and control loop and the methanol supply and control loop, and the diesel oil supply and control loop and the methanol supply and control loop are mutually independent.
According to another embodiment of the invention, it is further provided that said diesel supply and control circuit comprises two parts, a low pressure circuit and a high pressure circuit.
According to another embodiment of the invention, the low-pressure loop comprises an oil supply pipeline and an oil return pipeline, the oil supply pipeline is connected with a fuel delivery pump, a fuel coarse filter and a fuel fine filter, the oil return pipeline is connected with a one-way valve, and one end of the oil supply pipeline and one end of the oil return pipeline are connected with a high-pressure oil pump on the fuel tank and the other end of the oil supply pipeline and the other end of the oil return pipeline are connected with each other.
According to another embodiment of the invention, the high pressure loop further comprises an injector return line, one end of the injector return line is connected to the fuel tank, and the other end of the injector return line is connected to the high pressure oil pump, the injection solenoid valve and the injector respectively.
According to another embodiment of the invention, the methanol supply and control loop comprises an alcohol return pipeline and an alcohol supply pipeline which are connected with the methanol tank, the alcohol return pipeline is connected with a methanol injection pressure regulating valve, the alcohol supply pipeline is provided with a methanol pump and a one-way valve, the alcohol return pipeline and the alcohol supply pipeline are connected with a methanol pressure stabilizing distributor, and the methanol pressure stabilizing distributor is connected with a methanol fine filter and an alcohol spraying filter through pipelines; the methanol injection controller is connected with the methanol injector through a pipeline, and the methanol injection controller is connected with the methanol injection pressure regulating valve through a pipeline.
According to another embodiment of the invention, the alcohol sprayer is further installed at the tail end of an air inlet branch pipe of each cylinder of the engine.
According to another embodiment of the invention, the microcomputer is connected with the high-pressure oil pump and the oil injection electromagnetic valve through a diesel engine speed regulator, the diesel engine speed regulator is connected with a rotating speed sensor, the microcomputer is connected with a methanol injection controller, and the microcomputer is provided with an operator controller and a mode selection.
According to another embodiment of the invention, the speed regulation control method further comprises:
a. speed regulation control in a pure diesel mode;
b. speed regulation control when the pure diesel mode is switched to the dual-fuel mode;
c. speed regulation control when the gear is raised in the dual-fuel mode;
d. speed regulation control when the gear is lowered in the dual-fuel mode;
e. and controlling speed regulation when the dual-fuel mode is switched to the pure diesel mode.
According to another embodiment of the present invention, the speed regulation control method in the pure diesel mode further comprises:
firstly, after an operator switches the gear of the locomotive, a diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
and secondly, the speed regulator can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
According to another embodiment of the invention, the speed regulation control method when the pure diesel mode is switched to the dual-fuel mode further comprises the following steps:
firstly, a microcomputer needs to judge a current gear:
a. if the current gear is a no-load gear, the alcohol sprayer is kept in a non-working state;
b. if the current gear is other gears, the microcomputer sends an injection instruction and gear information to the methanol injection controller, then the methanol injector summarizes and inquires the preset alcohol injector control pulse width or pulse density of the current gear in a database, and controls the alcohol injector according to the control pulse width or pulse density to realize the quantitative injection of the methanol;
secondly, when the injected methanol breaks the energy balance between the diesel oil combustion and the motor output before, and the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, so that the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
According to another embodiment of the invention, the speed regulation control method during gear rising in the dual-fuel mode comprises the following steps:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly judges the gear change direction, and if the gear rises, the microcomputer informs a methanol injector to lock the current methanol injection rate;
and secondly, simultaneously, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
thirdly, repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by a microcomputer:
a. after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
b. after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
and fourthly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
According to another embodiment of the invention, the speed regulation control method during gear descending in the dual-fuel mode further comprises the following steps:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly compares the preset methanol injection quantity of a new gear with the current actual injection quantity:
a. if the preset methanol injection amount of the new gear is larger than the current actual injection amount after the gear is reduced:
the locomotive microcomputer informs the methanol injector to lock the current methanol injection rate, and simultaneously the diesel engine speed governor obtains a new rotating speed control target from the locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
if the rotating speed is lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by the microcomputer:
after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode;
b. if the preset methanol injection quantity of the new gear is lower than the current actual injection quantity after the gear is reduced, the microcomputer simultaneously sends new target rotating speed and injection speed quantity requirements to the diesel engine speed regulator and the methanol injection controller:
after the operator switches the gear of the locomotive, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
through speed sensor, the skew condition of current rotational speed and target rotational speed can be known to the speed regulator:
if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and secondly, compensating the rotation speed change caused by the methanol injection quantity and the output power change through closed-loop control of the diesel injection quantity in the process, so that the engine finally works in a stable rotation speed interval.
According to another embodiment of the invention, the method further comprises the speed regulation control method when the dual-fuel mode is switched to the pure diesel mode:
step one, a microcomputer sends a command of stopping work to a methanol injection controller, the methanol injection controller gradually reduces the output control pulse width or pulse density to 0, and an alcohol injector stops working;
step two, stopping the injection of the methanol to cause the energy balance of the fuel and the output power to be broken, and continuing to increase the control pulse width or pull an oil mass control rod if the rotating speed of the engine is lower than the target rotating speed to improve the circulating oil supply amount;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
The invention has the beneficial effects that: the liquid dual-fuel medium-speed diesel engine system adopts methanol as a liquid fuel, can be stored and filled at normal temperature and normal pressure, is convenient and quick and is not easy to leak. Meanwhile, the flash point of the methanol is about 10 ℃ and is far higher than that of the gas fuel, so that the methanol fuel is safer, and the engine controlled by the speed regulation control method has stable rotating speed output power and stable speed regulation process in the working process.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic diagram of the logic of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the liquid dual-fuel medium-speed diesel engine system comprises a microcomputer, a diesel oil supply and control loop and a methanol supply and control loop, wherein the microcomputer is connected to a high-pressure oil pump and an oil injection electromagnetic valve through a diesel engine speed regulator, the diesel engine speed regulator is connected with a rotation speed sensor, the microcomputer is connected with a methanol injection controller, the microcomputer is provided with an operator controller and a mode selection, the microcomputer is respectively connected with the diesel oil supply and control loop and the methanol supply and control loop, and the diesel oil supply and control loop and the methanol supply and control loop are independent of each other.
Wherein the diesel oil supply and control loop comprises a low-pressure loop and a high-pressure loop:
the low-pressure loop comprises an oil supply pipeline and an oil return pipeline, the oil supply pipeline is connected with a fuel oil delivery pump, a fuel oil coarse filter and a fuel oil fine filter, the oil return pipeline is connected with a one-way valve, and one end of the oil supply pipeline and one end of the oil return pipeline are connected with a high-pressure oil pump on the fuel tank and the other end of the oil supply pipeline and the high-pressure oil pump are connected;
the high-pressure loop comprises an oil sprayer oil return pipeline, one end of the oil sprayer oil return pipeline is connected to the fuel tank, and the other end of the oil sprayer oil return pipeline is respectively connected to the high-pressure oil pump, the oil spraying electromagnetic valve and the oil sprayer.
The working principle of the diesel oil supply and control loop is as follows:
in the working process, the fuel pump continuously supplies diesel oil from the fuel tank to the high-pressure oil pump through oil passages such as a coarse filter, the fuel pump, a one-way valve, a fine filter and the like, and a plunger in the high-pressure oil pump is driven by the diesel engine to further improve the fuel pressure. The speed regulator of the diesel engine can control the opening and closing of an electromagnetic valve at the rear end of a high-pressure oil pump and the opening and closing time length through pulse current control, and the high-pressure oil pump is an electronic injection monoblock pump; or the mechanical pull rod mechanism is a mechanical monoblock pump, and finally high-pressure fuel oil is sprayed into the cylinder through each cylinder fuel injector.
The methanol supply and control loop comprises a methanol return pipeline and a methanol supply pipeline which are connected with the methanol tank, the methanol return pipeline is connected with a methanol injection pressure regulating valve, the methanol supply pipeline is provided with a methanol pump and a one-way valve, the methanol return pipeline and the methanol supply pipeline are connected with a methanol pressure stabilizing distributor, and the methanol pressure stabilizing distributor is connected with a methanol fine filter and a methanol injection filter through pipelines; the methanol injection controller is connected with the methanol injector through a pipeline, and the methanol injection controller is connected with the methanol injection pressure regulating valve through a pipeline. The alcohol sprayer is arranged at the tail end of an air inlet branch pipe of each cylinder of the engine.
The working principle of the methanol supply and control loop is as follows:
in the working process, methanol is supplied to the methanol pressure stabilizing distributor from the methanol tank through a methanol pump, a one-way valve and other loops by the methanol pump, a throttling valve is additionally arranged on an alcohol return pipeline of the methanol pressure stabilizing distributor to control the methanol injection pressure, and the methanol in the methanol pressure stabilizing distributor reaches the alcohol injector through a methanol fine filter. The methanol injection controller controls the throttle valve through the pulse current, and the smaller the pulse density is, the smaller the throttle valve opening is, and the higher the injection pressure is; the methanol injection controller controls the alcohol injector by pulse current, and the methanol injection amount can be controlled by pulse width or density, and the higher the pulse width or density, the larger the methanol injection amount. Methanol is sprayed to an air inlet branch pipe of the engine through the alcohol sprayer, is entrained by fresh air and enters the air cylinder, and in the final stage of the compression process, the methanol is ignited by diesel oil to realize combustion work.
As shown in fig. 2, a speed regulation control method for a liquid dual-fuel medium-speed diesel engine system specifically includes:
a. speed regulation control in a pure diesel mode, specifically a structure numbered 1 in a block diagram in fig. 2;
b. speed regulation control when the pure diesel mode is switched to the dual-fuel mode, specifically to a structure with the frame number of 1 in fig. 2;
c. speed regulation control during gear rising in the dual-fuel mode, specifically a structure numbered as 2 in a frame diagram in fig. 2;
d. speed regulation control during gear reduction in a dual-fuel mode, specifically a structure numbered as 3 in a frame diagram in fig. 2;
e. the speed control when the dual fuel mode is switched to the pure diesel mode is specifically a structure with the frame number of 4 in fig. 2.
As shown in the structure numbered as 1 in the block diagram in fig. 2, the speed regulation control method in the pure diesel mode includes:
firstly, after an operator switches the gear of the locomotive, a diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
and secondly, the speed regulator can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
As in the structure numbered 2 in the block diagram of fig. 2, the speed control method when the pure diesel mode is switched to the dual-fuel mode includes:
firstly, a microcomputer needs to judge a current gear:
a. if the current gear is a no-load gear, the alcohol sprayer is kept in a non-working state;
b. if the current gear is other gears, the microcomputer sends an injection instruction and gear information to the methanol injection controller, then the methanol injector summarizes and inquires the preset alcohol injector control pulse width or pulse density of the current gear in a database, and controls the alcohol injector according to the control pulse width or pulse density to realize the quantitative injection of the methanol;
secondly, when the injected methanol breaks the energy balance between the diesel oil combustion and the motor output before, and the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, so that the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
As shown in the structure numbered as 3 in the block diagram of fig. 2, the speed control method during the gear rise in the dual-fuel mode includes:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly judges the gear change direction, and if the gear rises, the microcomputer informs a methanol injector to lock the current methanol injection rate;
and secondly, simultaneously, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
thirdly, repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by a microcomputer:
a. after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
b. after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
and fourthly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
As in the structure numbered 4 in the block diagram of fig. 2, the speed control method in the dual-fuel mode when the gear is down includes:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly compares the preset methanol injection quantity of a new gear with the current actual injection quantity:
a. if the preset methanol injection amount of the new gear is larger than the current actual injection amount after the gear is reduced:
the locomotive microcomputer informs the methanol injector to lock the current methanol injection rate, and simultaneously the diesel engine speed governor obtains a new rotating speed control target from the locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by the microcomputer:
after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode;
b. if the preset methanol injection quantity of the new gear is lower than the current actual injection quantity after the gear is reduced, the microcomputer simultaneously sends new target rotating speed and injection speed quantity requirements to the diesel engine speed regulator and the methanol injection controller:
after the operator switches the gear of the locomotive, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
through speed sensor, the skew condition of current rotational speed and target rotational speed can be known to the speed regulator:
if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and secondly, compensating the rotation speed change caused by the methanol injection quantity and the output power change through closed-loop control of the diesel injection quantity in the process, so that the engine finally works in a stable rotation speed interval.
As in the structure numbered 5 in the block diagram in fig. 2, the speed regulation control method when the dual-fuel mode is switched to the pure diesel mode:
step one, a microcomputer sends a command of stopping work to a methanol injection controller, the methanol injection controller gradually reduces the output control pulse width or pulse density to 0, and an alcohol injector stops working;
step two, stopping the injection of the methanol to cause the energy balance of the fuel and the output power to be broken, and continuing to increase the control pulse width or pull an oil mass control rod if the rotating speed of the engine is lower than the target rotating speed to improve the circulating oil supply amount;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
Examples
The working logic will be explained below in terms of specific implementation case parameters on an electrically-driven diesel locomotive using an electrospray diesel-methanol dual-fuel diesel engine: assume that the locomotive gear is N4 at the beginning of operation and is in pure diesel mode. The measured relevant parameters of the diesel engine in the gear are shown in a table 1, if an operator does not select a dual-fuel mode, the engine keeps the current working state, and the alcohol sprayer keeps the non-working state.
Figure DEST_PATH_IMAGE002
TABLE 1 partial parameters of N4 grade in pure diesel mode
In the pure diesel mode, after an operator changes the locomotive running gear to the N5 gear, the main parameters of the gear are shown in the table 2, a microcomputer sends a rotating speed control target of 840rpm to a speed regulator, and simultaneously, the main excitation current is increased to 107A. Through the speed sensor, the speed regulator detects that the rotating speed of the diesel engine is lower than the target rotating speed, and at the moment, the speed regulator increases the control pulse width of the electromagnetic valve, so that the circulating oil supply amount is increased, and the rotating speed of the diesel engine is synchronously monitored. If the rotating speed is still lower than the target rotating speed, continuing to increase the control pulse width; if the rotating speed is higher than the target rotating speed, the control pulse width is shortened, and the circulating oil supply amount is reduced. The above closed-loop adjustment process is repeated until the engine stabilizes near the target speed.
Figure DEST_PATH_IMAGE004
TABLE 2 partial parameters of N5 grade in pure diesel mode
Under the conditions that an operator does not select the dual-fuel mode, the engine keeps the current working state and the alcohol sprayer keeps the non-working state, the operator switches the mode to the dual-fuel mode, the current gear is N4 gear and is not an idle gear, the alcohol sprayer starts to spray under the control of the methanol injection controller, and main parameters of the N4 gear in the dual-fuel mode are shown in the table 3. Compared with the table 1, the target rotating speed and the main excitation are not changed, but the output pulse width of the methanol injection controller is increased from 0 to 12000 mu s preset at the gear, the injected methanol breaks the energy balance between the diesel combustion and the motor output, the rotating speed exceeds the target rotating speed, the speed regulator starts the closed-loop control process described in the pure diesel mode, the final circulating oil supply of the speed regulator is reduced from 1170mg to 637mg, the engine is stabilized at 800rpm again, and the output power is unchanged.
TABLE 3 partial parameters of N4 gear in dual fuel mode
When the engine is operating in the dual fuel mode, if the operator raises the gear to N5, the main parameters of N5 gear in the dual fuel mode are shown in table 4. The microcomputer first informs the methanol injection control to lock the current methanol injection rate so that the control pulse width of the methanol injection controller is maintained at 12000 mus in table 3 while the target rotation speed of 840rpm is transmitted to the speed governor. The speed deviation drives the speed governor to invoke the closed loop control process described in the pure diesel mode to stabilize the engine speed within the rotational speed interval of 840 +/-5 rpm. After the rotating speed enters a stable interval, the microcomputer monitors whether the main power output electric power is stable or not. If the output power is not stable, the resistance torque generated by the main engine will continue to change along with the output power, and the caused change of the rotating speed of the engine will trigger the closed-loop control process in the pure diesel mode again until the output power is stable. After the output power is stable, the methanol injection controller starts to gradually increase the control pulse width to 15000 mu s preset at the gear. In the process, the energy provided by the fuel exceeds the output power, the energy balance between the fuel and the output power is broken, the rotating speed of the diesel engine shows an ascending trend, and the speed regulator enters a closed-loop control process again to adjust and control the pulse width. In the whole speed regulation process, the circulating oil supply quantity is increased and then decreased, and the circulating oil supply quantity is controlled to be 719.3 mg.
Figure DEST_PATH_IMAGE008
TABLE 4 partial parameters of N5 gear in dual fuel mode
In the dual-fuel mode, if an operator directly lifts the locomotive operating handle from the N4 gear to the N7 gear and quickly lowers the handle to the N5 gear before the engine reaches stable operation, the actual injection amount of the methanol is 54.7g/s locked at the N4 in the process of directly lifting the handle from the N4 to the N7, after the handle is lowered to the N5, the microcomputer finds out through comparison that the preset injection amount of the methanol in the new gear is 62.92g/s and is higher than 54.7g/s, the action of the operator is equivalent to lifting the handle from the N4 to the N5, and the control process is the same as the operation method of lifting the gear to the N5 when the engine works in the dual-fuel mode.
In the dual fuel mode, the operator lowers the locomotive operating handle from the N4 gear to the N3 gear, and the partial parameters of the N3 gear in the dual fuel mode are shown in Table 5. After the comparison of the microcomputer, the preset methanol injection quantity of the new gear after the reduction is smaller than the current actual injection quantity, so that the microcomputer updates the target rotating speed of the speed regulator to 640rpm and simultaneously informs the methanol injection controller to adjust the control pulse width to 4000 microseconds. Then, disturbance factors caused by the fluctuation of the output power and the reduction of the methanol injection amount are simultaneously responded by the adjustment of the circulating oil supply amount in the process of eliminating the deviation of the rotating speed of the speed regulator, and the stable operation of the engine is realized.
Figure DEST_PATH_IMAGE010
TABLE 5 partial parameters of N3 gear in dual fuel mode
Under the dual-fuel mode, when the engine works at the N4 gear, and the mode is switched to the pure diesel mode from the dual-fuel mode by an operator, the microcomputer directly sends an instruction for stopping working to the methanol injection controller, the control pulse width of the methanol injection controller returns to zero, and the methanol injection stops.

Claims (13)

1. A liquid dual-fuel medium-speed diesel engine system comprises a microcomputer, a diesel oil supply and control loop and a methanol supply and control loop, and is characterized in that the microcomputer is respectively connected with the diesel oil supply and control loop and the methanol supply and control loop, and the diesel oil supply and control loop and the methanol supply and control loop are mutually independent.
2. The liquid dual fuel medium speed diesel engine system of claim 1 wherein: the diesel oil supply and control loop comprises a low-pressure loop and a high-pressure loop.
3. The liquid dual fuel medium speed diesel engine system of claim 2 wherein: the low-pressure loop comprises an oil supply pipeline and an oil return pipeline, a fuel oil delivery pump, a fuel oil coarse filter and a fuel oil fine filter are connected to the oil supply pipeline, a one-way valve is connected to the oil return pipeline, and one end of the oil supply pipeline and one end of the oil return pipeline are connected to a high-pressure oil pump connected to the fuel tank and the other end of the oil supply pipeline and the other end of the oil return pipeline are connected.
4. The liquid dual fuel medium speed diesel engine system of claim 2 wherein: the high-pressure loop comprises an oil sprayer oil return pipeline, one end of the oil sprayer oil return pipeline is connected to the fuel tank, and the other end of the oil sprayer oil return pipeline is connected to the high-pressure oil pump, the oil spraying electromagnetic valve and the oil sprayer respectively.
5. The liquid dual fuel medium speed diesel engine system of claim 1 wherein: the methanol supply and control loop comprises an alcohol return pipeline and an alcohol supply pipeline which are connected with the methanol tank, the alcohol return pipeline is connected with a methanol injection pressure regulating valve, the alcohol supply pipeline is provided with a methanol pump and a one-way valve, the alcohol return pipeline and the alcohol supply pipeline are connected with a methanol pressure stabilizing distributor, and the methanol pressure stabilizing distributor is connected with a methanol fine filter and an alcohol injection filter through pipelines; the methanol injection controller is connected with the methanol injector through a pipeline, and the methanol injection controller is connected with the methanol injection pressure regulating valve through a pipeline.
6. The liquid dual fuel medium speed diesel engine system of claim 5 wherein: the alcohol sprayer is arranged at the tail end of an air inlet branch pipe of each cylinder of the engine.
7. The liquid dual fuel medium speed diesel engine system of claim 1 wherein: the microcomputer is connected with the high-pressure oil pump and the oil injection electromagnetic valve through a diesel engine speed regulator, the diesel engine speed regulator is connected with a rotating speed sensor, the microcomputer is connected with a methanol injection controller, and the microcomputer is provided with an operator controller and a mode selection.
8. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system according to claim 1, characterized in that the speed regulation control method comprises:
a. speed regulation control in a pure diesel mode;
b. speed regulation control when the pure diesel mode is switched to the dual-fuel mode;
c. speed regulation control when the gear is raised in the dual-fuel mode;
d. speed regulation control when the gear is lowered in the dual-fuel mode;
e. and controlling speed regulation when the dual-fuel mode is switched to the pure diesel mode.
9. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system of claim 8, characterized in that the speed regulation control method in the pure diesel mode comprises:
firstly, after an operator switches the gear of the locomotive, a diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
and secondly, the speed regulator can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
10. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system according to claim 8, characterized in that the speed regulation control method when the pure diesel mode is switched to the dual-fuel mode comprises:
firstly, a microcomputer needs to judge a current gear:
a. if the current gear is a no-load gear, the alcohol sprayer is kept in a non-working state;
b. if the current gear is other gears, the microcomputer sends an injection instruction and gear information to the methanol injection controller, then the methanol injector summarizes and inquires the preset alcohol injector control pulse width or pulse density of the current gear in a database, and controls the alcohol injector according to the control pulse width or pulse density to realize the quantitative injection of the methanol;
secondly, when the injected methanol breaks the energy balance between the diesel oil combustion and the motor output before, and the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, so that the circulating oil supply quantity is reduced;
and thirdly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
11. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system according to claim 8, characterized in that the speed regulation control method when the gear is raised in the dual-fuel mode comprises:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly judges the gear change direction, and if the gear rises, the microcomputer informs a methanol injector to lock the current methanol injection rate;
and secondly, simultaneously, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
a. if the rotating speed is lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
b. if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
thirdly, repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by a microcomputer:
a. after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
b. after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
and fourthly, repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode.
12. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system according to claim 8, characterized in that the speed regulation control method when the gear is down in the dual-fuel mode comprises:
firstly, when an operator changes an operating gear, a locomotive microcomputer firstly compares the preset methanol injection quantity of a new gear with the current actual injection quantity:
a. if the preset methanol injection amount of the new gear is larger than the current actual injection amount after the gear is reduced:
the locomotive microcomputer informs the methanol injector to lock the current methanol injection rate, and simultaneously the diesel engine speed governor obtains a new rotating speed control target from the locomotive microcomputer, and the diesel engine speed governor can obtain the deviation condition of the current rotating speed and the target rotating speed through a rotating speed sensor:
if the rotating speed is lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
repeating the closed loop adjustment process until the engine is stabilized in a set rotating speed interval, and after the rotating speed reaches the stable interval, judging whether the output power is stable by the microcomputer:
after the output power reaches a stable value, the locomotive microcomputer updates the working instruction of the methanol injection controller, and the methanol injector adjusts the width or pulse density of the control pulse of the methanol injector according to the preset value of the current gear;
after the alcohol spraying amount of the alcohol sprayer changes and breaks the balance between the fuel and the output power, if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil amount control rod is pulled in the opposite direction, and the circulating oil supply amount is reduced;
repeating the closed loop adjustment process to enable the rotating speed to be stabilized near a set value again, and realizing the stable operation of the engine in the dual-fuel mode;
b. if the preset methanol injection quantity of the new gear is lower than the current actual injection quantity after the gear is reduced, the microcomputer simultaneously sends new target rotating speed and injection speed quantity requirements to the diesel engine speed regulator and the methanol injection controller:
after the operator switches the gear of the locomotive, the diesel engine speed governor obtains a new rotating speed control target from a locomotive microcomputer;
through speed sensor, the skew condition of current rotational speed and target rotational speed can be known to the speed regulator:
if the rotating speed is still lower than the target rotating speed, the control pulse width is continuously increased or an oil mass control rod is pulled, so that the circulating oil supply amount is increased;
if the rotating speed is higher than the target rotating speed, the control pulse width is shortened or an oil quantity control rod is pulled in the opposite direction, and the circulating oil supply quantity is reduced;
and secondly, compensating the rotation speed change caused by the methanol injection quantity and the output power change through closed-loop control of the diesel injection quantity in the process, so that the engine finally works in a stable rotation speed interval.
13. The speed regulation control method of the liquid dual-fuel medium speed diesel engine system according to claim 8, characterized in that the speed regulation control method when the dual-fuel mode is switched to the pure diesel mode is as follows:
step one, a microcomputer sends a command of stopping work to a methanol injection controller, the methanol injection controller gradually reduces the output control pulse width or pulse density to 0, and an alcohol injector stops working;
step two, stopping the injection of the methanol to cause the energy balance of the fuel and the output power to be broken, and continuing to increase the control pulse width or pull an oil mass control rod if the rotating speed of the engine is lower than the target rotating speed to improve the circulating oil supply amount;
and thirdly, repeating the closed loop adjustment process until the engine is stabilized in a range near the target rotating speed.
CN201911049222.1A 2019-10-31 2019-10-31 Liquid dual-fuel medium-speed diesel engine system and speed regulation control method thereof Pending CN110700954A (en)

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