CN115217642B - Control method and control device for dual-fuel engine - Google Patents
Control method and control device for dual-fuel engine Download PDFInfo
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- CN115217642B CN115217642B CN202210759317.8A CN202210759317A CN115217642B CN 115217642 B CN115217642 B CN 115217642B CN 202210759317 A CN202210759317 A CN 202210759317A CN 115217642 B CN115217642 B CN 115217642B
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- 239000000446 fuel Substances 0.000 title claims abstract description 376
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000009977 dual effect Effects 0.000 claims description 32
- 239000003921 oil Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 24
- 239000002737 fuel gas Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000000295 fuel oil Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000001960 triggered effect Effects 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F02D19/08—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
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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
- F02D19/0642—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
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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
- F02D19/066—Retrofit of secondary fuel supply systems; Conversion of engines to operate on multiple fuels
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- 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)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a control method and a control device of a dual-fuel engine, wherein the control method comprises the following steps: according to failure of switching of the dual-fuel engine or the situation that the dual-fuel engine encounters an obstacle in the dual-fuel mode, controlling the dual-fuel engine to operate in a fuel mode for a preset period of time, and then trying to switch to the dual-fuel mode; and returning to the step of executing the interval for a preset time interval according to the switching failure, and then trying to switch to the dual-fuel mode. When the switching fails or the dual-fuel mode operation alarms, the control method controls the dual-fuel engine to operate in the fuel mode, then controls the dual-fuel engine to switch to the dual-fuel mode at intervals of preset time, if the switching is unsuccessful, and tries to switch to the dual-fuel mode again after the intervals of preset time until the switching is successful, the whole process is automatically controlled, the number of times of manual operation is reduced, and the dual-fuel engine is not easy to cut out of the dual-fuel mode, so that the operation time of the dual-fuel mode required by the policy is reached.
Description
Technical Field
The invention relates to the technical field of dual-fuel engines, in particular to a control method of a dual-fuel engine, and also relates to a control device of the dual-fuel engine.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
The dual fuel engine operates on different fuels in a different combustion mode, and is diffusion combustion when using a diesel mode, and is similar to premixed combustion when using a gas mode. When the pure diesel mode is switched to the dual-fuel mode, the combustion condition is complex, so that the switching enabling condition is required to be met to switch, and simultaneously, when the switching-out is triggered, the dual-fuel can be switched out, and the pure diesel is adopted for running. Most of the domestic dual-fuel engines are currently in policy driving and cannot be operated in a dual-fuel mode for a long time, and the current policy clearly requires that the dual-fuel ship has enough operation time in the dual-fuel mode to obtain corresponding subsidies.
Disclosure of Invention
The invention aims to at least solve the problems that the existing dual-fuel engine is easy to exit from a dual-fuel mode and adopts single fuel operation, and the policy requirements on the dual-fuel operation duration cannot be met. The aim is achieved by the following technical scheme:
A first aspect of the present invention proposes a control method of a dual fuel engine capable of switching operation between a fuel mode and a dual fuel mode, comprising the steps of:
The control method comprises the following steps:
According to failure of switching the dual-fuel engine from the fuel mode to the dual-fuel mode or the failure of the dual-fuel engine in the operation of the dual-fuel mode, controlling the dual-fuel engine to operate in the fuel mode for a preset period of time;
after the dual-fuel engine runs for a preset time period in a fuel mode, controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode;
and returning to the step of controlling the dual-fuel engine to switch from the fuel oil mode to the dual-fuel mode until the dual-fuel engine is successfully switched to the dual-fuel mode according to the failure of switching the dual-fuel engine to the dual-fuel mode.
According to the control method of the dual-fuel engine, when the dual-fuel engine fails to switch from the fuel mode to the dual-fuel mode or the dual-fuel engine triggers an alarm in the operation of the dual-fuel mode, the dual-fuel engine is controlled to operate in the fuel mode, then the dual-fuel engine is controlled to switch to the dual-fuel mode at intervals of preset time, if the switching is unsuccessful, the switching is continued to be attempted to the dual-fuel mode again after the intervals of preset time until the switching is successful, the whole process is automatically controlled by the control unit of the engine to complete the switching, so that the mode switching of the dual-fuel engine can automatically operate, the number of manual operation times is reduced, and the dual-fuel engine is not easy to switch out of the dual-fuel mode, so that the operation duration of the dual-fuel mode required by a policy is reached.
In addition, the control method of the dual-fuel engine according to the invention may also have the following additional technical features:
In some embodiments of the invention, the control method of the dual fuel engine further comprises the steps of:
Receiving a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine;
According to the switching mode signal, the current mode signal is a fuel mode, the current working condition signal meets a preset boundary condition, and the dual-fuel engine is controlled to be switched from the fuel mode to the dual-fuel mode;
And controlling the dual-fuel engine to run in a fuel mode according to the fact that the current working condition signal does not meet a preset boundary condition.
In some embodiments of the present disclosure, the current operating condition signal includes an engine speed signal, an engine load signal, and an engine alert signal, and the preset boundary condition includes an engine speed value corresponding to the engine speed signal being greater than a preset speed threshold, an engine load value corresponding to the engine load signal being greater than a preset load threshold, and the engine alert signal indicating an unarmed state.
In some embodiments of the invention, the control method further comprises: acquiring the number of attempts for controlling the dual-fuel engine to switch to a dual-fuel mode;
and controlling the dual-fuel engine to continuously operate in a fuel mode according to the fact that the number of attempts is larger than a preset number.
In some embodiments of the present invention, the alarm device is controlled to emit an alarm signal according to the number of attempts being greater than the preset number.
In some embodiments of the present invention, after the step of controlling the dual-fuel engine to operate in the fuel mode according to failure of the dual-fuel engine to switch from the fuel mode to the dual-fuel mode or the dual-fuel engine encounters an obstacle in the dual-fuel mode operation, the method further comprises the steps of:
and according to failure of switching the dual-fuel engine to the dual-fuel mode or triggering alarm of the dual-fuel engine in the dual-fuel mode operation, controlling the alarm device to send an alarm signal.
In some embodiments of the present invention, the dual-fuel engine is a fuel-gas dual-fuel engine, the step of controlling the alarm device to send an alarm signal according to failure of the dual-fuel engine to switch to a dual-fuel mode or triggering an alarm in the dual-fuel mode operation of the dual-fuel engine comprises:
receiving a first parameter signal of the dual-fuel engine, wherein the first parameter signal comprises at least one of a water temperature signal, an oil temperature signal, a water pressure signal, an oil pressure signal, an exhaust temperature signal and a gas pressure signal;
Controlling the dual-fuel engine to operate in a fuel mode according to at least one of the water temperature signal being greater than a preset water temperature value, the oil temperature signal being greater than a preset oil temperature value, the water pressure signal being lower than a preset water pressure value, the oil pressure signal being lower than a preset oil pressure value, the exhaust temperature signal being higher than a preset exhaust temperature value and the fuel gas pressure signal being lower than a preset fuel gas pressure value, and controlling an alarm device to emit a first alarm signal;
And/or the number of the groups of groups,
Receiving a second parameter signal of the dual fuel engine, the second parameter signal comprising at least one of an engine knock signal and an engine overload signal;
and controlling the dual-fuel engine to run in a fuel mode according to the engine knocking signal representing engine knocking or the engine overload signal representing engine overload, and controlling the alarm device to send out a second alarm signal.
In some embodiments of the present invention, the dual-fuel engine is a fuel-gas dual-fuel engine, and the step of controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode after the dual-fuel engine is operated in the fuel mode for a preset period of time includes:
Receiving a rotational speed fluctuation signal and a gas pressure fluctuation signal of the dual-fuel engine;
Judging whether the rotating speed fluctuation signal is larger than a preset rotating speed fluctuation threshold value or not, and judging whether the gas pressure fluctuation signal is larger than a preset gas pressure fluctuation threshold value or not;
And returning to the step of controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode after executing the operation of the dual-fuel engine in the fuel mode for a preset duration according to the fact that the rotating speed fluctuation signal is larger than a preset rotating speed fluctuation threshold value and the fuel gas pressure fluctuation signal is larger than a preset fuel gas pressure fluctuation threshold value.
In some embodiments of the invention, the dual-fuel engine is a fuel-gas dual-fuel engine, and the controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode comprises:
and controlling the gas valve of the dual-fuel engine to be opened, and controlling the oil injection quantity to be reduced and reaching the preset ignition oil quantity.
A second aspect of the present invention proposes a control device for a dual-fuel engine capable of switching operation between a fuel mode and a dual-fuel mode, for implementing the control method for a dual-fuel engine according to the first aspect of the present invention, the control device comprising:
The acquisition unit is used for acquiring a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine;
the judging unit is used for judging whether to switch to a dual-fuel mode or a fuel mode according to the switching mode signal, the current mode signal and the current working condition signal;
The switching unit is used for switching the operation mode of the dual-fuel engine according to the judging result of the judging unit;
And the alarm unit is used for alarming according to the working condition and the switching state of the dual-fuel engine.
The control device of the dual-fuel engine according to the second aspect of the present invention has the same advantages as the control method of the dual-fuel engine according to the first aspect of the present invention, and will not be described herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
Fig. 1 schematically shows a control logic diagram of a control method of a dual fuel engine according to an embodiment of the invention;
Fig. 2 schematically shows a structural schematic diagram of a control device of a dual fuel engine according to an embodiment of the present invention;
the reference numerals are as follows:
10: control device for dual-fuel engine, 11: acquisition unit, 12: judgment unit, 13: switching unit, 14: an alarm unit;
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Accordingly, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
As shown in fig. 1, a first aspect of the present invention proposes a control method of a dual-fuel engine capable of switching operation between a fuel mode and a dual-fuel mode, comprising the steps of:
According to failure of switching the dual-fuel engine from the fuel mode to the dual-fuel mode or the failure of the dual-fuel engine in the operation of the dual-fuel mode, controlling the dual-fuel engine to operate in the fuel mode for a preset period of time;
after the dual-fuel engine runs for a preset time period in a fuel mode, controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode;
and returning to the step of controlling the dual-fuel engine to switch from the fuel oil mode to the dual-fuel mode until the dual-fuel engine is successfully switched to the dual-fuel mode according to the failure of switching the dual-fuel engine to the dual-fuel mode.
It can be understood that the dual-fuel engine is an engine running by adopting two fuels, such as a diesel-gas engine, and the engine is structurally characterized in that a gas injection system is added on the basis of a diesel engine, so that pollutants discharged by gas combustion are fewer than fuel oil, and the environmental protection effect is better. The diesel-gas engine can be carried out by adopting diesel in a starting stage and a failure stage of a dual-fuel mode, wherein the diesel is used for igniting fuel gas for combustion, and in the dual-fuel mode, the diesel-gas engine is driven by the co-combustion of the diesel and the fuel gas.
In the operation of the diesel-gas engine, when parameters such as the engine speed, the water temperature, the oil pressure, the air pressure, the exhaust temperature and the like do not reach preset switching boundary conditions according to actual working conditions, the switching of the engine mode can fail, and at the moment, the engine can be switched to a fuel mode to operate by adopting diesel. To ensure the dual fuel mode operation duration, the mode needs to be switched to the dual fuel mode, after a preset duration interval, for example 60 seconds, the engine working condition may be restored to meet the boundary condition during the interval, at this time, the engine can be controlled to be switched to the dual fuel mode again, if the switching is still failed, and the above actions are repeated until the switching is successful.
The working condition of the engine can be obtained according to various sensors on the engine, such as a rotating speed sensor for detecting the rotating speed of the engine, a temperature sensor for monitoring the water temperature of the engine and the like, the various sensors are electrically connected with an ECU (electronic control unit) of the engine to realize data transmission, and the ECU is connected with various parts of the engine to realize control, such as the ECU is electrically connected with a fuel injection system and a fuel injection system to realize electric control fuel injection and air injection.
According to the control method of the dual-fuel engine, when the dual-fuel engine fails to switch from the fuel mode to the dual-fuel mode or the dual-fuel engine triggers an alarm in the operation of the dual-fuel mode, the dual-fuel engine is controlled to operate in the fuel mode, then the dual-fuel engine is controlled to switch to the dual-fuel mode at intervals of preset time, if the switching is unsuccessful, the switching is continued to be attempted to the dual-fuel mode again after the intervals of preset time until the switching is successful, the whole process is automatically controlled by the control unit of the engine to complete the switching, so that the mode switching of the dual-fuel engine can automatically operate, the number of manual operation times is reduced, and the dual-fuel engine is not easy to switch out of the dual-fuel mode, so that the operation duration of the dual-fuel mode required by a policy is reached.
In some embodiments of the invention, the control method of the dual fuel engine further comprises the steps of:
Receiving a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine;
judging whether the switching mode signal represents a mode to be switched, judging whether the current mode signal is a fuel mode, and judging whether the current working condition signal meets a preset boundary condition;
according to the switching mode signal, the current mode signal is a fuel mode, and the current working condition signal meets the preset boundary condition, the dual-fuel engine is controlled to be switched from the fuel mode to the dual-fuel mode;
and if the current working condition signal does not meet the preset boundary condition, controlling the dual-fuel engine to operate in a fuel mode.
The switching mode signal may be a mode switching button of the engine, which is manually operated to manually switch the mode, and when the button is pressed, a signal indicating switching to the dual fuel mode is sent to the ECU. The current mode signal indicates whether the engine is currently in a mode, i.e., whether the engine is in a fuel mode or a dual fuel mode, is available from data recorded in the ECU. The current working condition signals are parameters such as oil pressure, water temperature, rotating speed and the like of the engine, and are obtained according to various sensors arranged on the engine.
The preset boundary conditions are that each operation parameter of the engine reaches the condition that the operation parameter can be switched to the dual-fuel mode, such as the rotation speed reaches the standard, the water temperature reaches the standard, the air pressure reaches the standard, and the like, and the ECU judges whether the operation parameter reaches the preset boundary conditions according to the working condition signals so as to control the dual-fuel engine to switch to the mode, and under the condition that the operation parameter does not reach the standard, the dual-fuel engine is switched to the fuel mode, so that the normal operation of the engine is ensured.
In some embodiments of the present invention, the current operating condition signal includes an engine speed signal, an engine load signal, and an engine warning signal, the preset boundary condition includes an engine speed value corresponding to the engine speed signal being greater than a preset speed threshold, an engine load value corresponding to the engine load signal being greater than a preset load threshold, and the engine warning signal indicating an unarmed state.
It is understood that the current working condition signal is parameters such as oil pressure, water temperature, rotation speed of the engine, and the like, and can be obtained according to various sensors arranged on the engine. When the engine rotating speed signal is larger than a preset rotating speed threshold value, the engine load signal is larger than a preset load threshold value and the engine alarm signal is in an alarm-free state, the dual-fuel engine can be judged to be normally switched to a dual-fuel mode, and the ECU controls the dual-fuel engine to switch modes.
In some embodiments of the invention, the control method further comprises: acquiring the number of attempts for controlling the dual-fuel engine to switch to a dual-fuel mode;
and controlling the dual-fuel engine to continuously operate in a fuel mode according to the fact that the number of attempts is larger than a preset number.
It should be noted that when the dual-fuel engine fails to switch to the dual-fuel mode, the dual-fuel engine needs to be switched to the fuel mode to ensure the normal operation of the engine, then the preset time is needed, the working condition of the engine may be recovered to meet the switching boundary condition at this time, then the switching to the dual-fuel mode may be tried again, if the switching is unsuccessful, the upper operation may be repeated until the switching is successful, of course, the number of times of repetition needs to be limited, if not more than three times, when the switching is unsuccessful for three times, the repeated execution is ended, the engine is controlled to operate in the fuel mode, the operator performs maintenance check on the engine, and the running state of the engine is adjusted to prepare for the next mode switching.
In some embodiments of the present invention, the alarm device is controlled to emit an alarm signal according to the number of attempts being greater than the preset number.
It will be appreciated that upon failure of multiple attempts to switch to the dual fuel mode, an alarm alert may need to be triggered in response to an engine condition anomaly, at which time a red light may be illuminated on the engine meter to indicate an important alarm.
In some embodiments of the present invention, after the step of controlling the dual-fuel engine to operate in the fuel mode according to failure of the dual-fuel engine to switch from the fuel mode to the dual-fuel mode or an obstacle encountered in operation of the dual-fuel engine in the dual-fuel mode, the step of:
and according to failure in switching the dual-fuel engine to the dual-fuel mode or the situation that the dual-fuel engine encounters an obstacle in the operation of the dual-fuel mode, controlling the alarm device to send an alarm signal.
When the dual-fuel engine fails to switch to the dual-fuel mode or encounters an obstacle in the dual-fuel mode, an alarm can be indicated by lighting a lamp on an instrument of the engine to remind an operator of the obstacle.
In some embodiments of the present invention, the dual-fuel engine is a fuel-gas dual-fuel engine, and the step of controlling the alarm device to send an alarm signal includes:
Receiving a parameter signal of a dual-fuel engine, wherein the parameter signal comprises at least one of a water temperature signal, an oil temperature signal, a water pressure signal, an oil pressure signal, an exhaust temperature signal, a gas pressure signal, an engine knock signal and an engine overload signal;
controlling the dual-fuel engine to operate in a fuel mode and controlling the alarm device to send a first alarm signal according to at least one of a water temperature signal being greater than a preset water temperature value, an oil temperature signal being greater than a preset oil temperature value, a water pressure signal being lower than a preset water pressure value, an oil pressure signal being lower than a preset oil pressure value, an exhaust temperature signal being higher than a preset exhaust temperature value and a fuel pressure signal being lower than a preset fuel pressure value;
And controlling the dual-fuel engine to operate in a fuel mode according to the engine knock signal representing engine knock or the engine overload signal representing engine overload, and controlling the alarm device to send out a second alarm signal.
It will be appreciated that when the water temperature signal, oil temperature signal, water pressure signal, oil pressure signal, exhaust temperature signal, gas pressure signal of the engine are abnormal, a primary alarm may be triggered and the attempt to switch to the dual fuel mode may continue. When the knock signal and the overload signal of the engine are abnormal, an important alarm can be triggered to control the engine to run in a fuel mode.
In some embodiments of the present invention, the dual-fuel engine is a fuel-gas dual-fuel engine, and when the dual-fuel engine fails to switch to the dual-fuel mode, the step of controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode after the dual-fuel engine is operated in the fuel mode for a preset period of time is performed, includes:
Receiving a rotational speed fluctuation signal and a fuel gas pressure fluctuation signal of a dual-fuel engine;
Judging whether the rotating speed fluctuation signal is larger than a preset rotating speed fluctuation threshold value or not, and judging whether the gas pressure fluctuation signal is larger than a preset gas pressure fluctuation threshold value or not;
And returning to the step of controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode after executing the operation for a preset time period according to the fuel mode of the dual-fuel engine according to the fact that the rotating speed fluctuation signal is larger than the preset rotating speed fluctuation threshold value and the fuel gas pressure fluctuation signal is larger than the preset fuel gas pressure fluctuation threshold value.
It should be noted that, during the switching process, when the rotation speed fluctuation signal and the gas pressure fluctuation signal are abnormal, the primary alarm may be triggered, and the switching to the dual fuel mode is continuously attempted. At this time, the control instrument lights up the yellow lamp, and cannot enter the dual-fuel mode. The ECU timer starts counting, and when the time T is reached, the switching of the dual fuel mode is automatically performed without the need of further manual entry. When the counter starts counting and can not be accessed for three times of automatic switching, an important alarm of a dual-fuel mode is reported, the instrument is controlled to light a red light, and the operation is performed in a pure diesel mode.
In some embodiments of the invention, the dual fuel engine is a fuel-gas dual fuel engine, and controlling the dual fuel engine to switch from the fuel mode to the dual fuel mode comprises:
And controlling a fuel gas valve of the dual-fuel engine to be opened, and controlling the fuel injection quantity to be reduced and reaching the preset ignition oil quantity.
It will be appreciated that when switching to the dual fuel mode, the gas valve needs to be opened to allow gas to enter the engine, then the fuel injection amount is reduced to balance the fuel of the engine, and the fuel injection amount needs to reach the standard of being able to ignite the gas, so that the fuel injection amount is able to successfully ignite the gas, thereby achieving the effect of dual fuel combustion.
As shown in fig. 1, the control method provided by the invention has the following flow:
Firstly, starting a dual-fuel engine in a diesel mode, when a driver presses a dual-fuel mode change-over switch, judging whether a dual-fuel mode change-over boundary condition is met by an ECU according to a received signal, if so, switching to the dual-fuel mode, and if not, running in the diesel mode if the fuel on the instrument is successfully converted, and reporting a primary alarm by a bright yellow lamp, counting a timer, attempting to switch to the dual-fuel mode after a preset time interval, and if the switch still fails after three attempts, controlling the engine to run in the diesel mode and not continuing to try. In the running of the engine in the dual-fuel mode, if the dual-fuel cut-out limit is triggered and the engine needs to be switched to the diesel mode, judging whether the engine is in the primary alarm or the important alarm according to the received working condition signals and the like, if the engine is in the primary alarm, running in the diesel mode, turning on a yellow lamp to report the primary alarm, counting by a timer, attempting to switch to the dual-fuel mode after a preset time interval, and if the switching fails after three times of attempts, controlling the engine to run in the diesel mode. If the alarm is important, the engine is controlled to run in a diesel mode by lighting the red light to send out the important alarm.
As shown in fig. 2, a second aspect of the present invention proposes a control device 10 for a dual-fuel engine, for implementing the control method for a dual-fuel engine according to the first aspect of the present invention, the dual-fuel engine being capable of switching operation between a fuel mode and a dual-fuel mode, the control device comprising: the system comprises an acquisition unit 11, a judging unit 12, a switching unit 13 and an alarm unit 14, wherein the acquisition unit 11 is used for acquiring a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine; the judging unit 12 is used for judging whether to switch to the dual-fuel mode or the fuel mode according to the switching mode signal, the current mode signal and the current working condition signal; the switching unit 13 is used for switching the operation mode of the dual-fuel engine according to the judging result of the judging unit; the alarm unit 14 is used for alarming according to the working condition and the switching state of the dual-fuel engine.
It should be noted that, the acquiring unit 11 receives monitoring signals from sensors of the engine, the judging unit 12 and the switching unit 13 are integrated in an ECU of the engine and electrically connected with various devices of the engine to realize control, and the alarm unit 14 may be an engine control instrument provided with a warning lamp, and when an alarm is triggered, the warning lamp displays different colors according to alarm levels.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A control method of a dual fuel engine capable of switching operation between a fuel mode and a dual fuel mode, characterized by comprising the steps of:
According to failure of switching the dual-fuel engine from the fuel mode to the dual-fuel mode or the failure of the dual-fuel engine in the operation of the dual-fuel mode, controlling the dual-fuel engine to operate in the fuel mode for a preset period of time;
after the dual-fuel engine runs for a preset time period in a fuel mode, controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode;
and returning to the step of controlling the dual-fuel engine to switch from the fuel oil mode to the dual-fuel mode until the dual-fuel engine is successfully switched to the dual-fuel mode according to the failure of switching the dual-fuel engine to the dual-fuel mode.
2. The control method of a dual fuel engine as set forth in claim 1, characterized in that the control method of a dual fuel engine further includes the steps of:
Receiving a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine;
according to the switching mode signal, the dual-fuel engine is controlled to be switched to a dual-fuel mode, the current mode signal is a fuel mode, and the current working condition signal meets a preset boundary condition;
And controlling the dual-fuel engine to run in a fuel mode according to the fact that the current working condition signal does not meet a preset boundary condition.
3. The control method of a dual fuel engine of claim 2, wherein the current operating condition signal includes an engine speed signal, an engine load signal, and an engine warning signal, the preset boundary condition includes an engine speed value corresponding to the engine speed signal being greater than a preset speed threshold, an engine load value corresponding to the engine load signal being greater than a preset load threshold, and the engine warning signal indicating an unarmed state.
4. The control method of a dual fuel engine as set forth in claim 1, characterized in that the control method further includes: acquiring the number of attempts for controlling the dual-fuel engine to switch to a dual-fuel mode;
and controlling the dual-fuel engine to continuously operate in a fuel mode according to the fact that the number of attempts is larger than a preset number.
5. The control method of a dual fuel engine as set forth in claim 4, characterized in that the warning device is controlled to emit a warning signal based on the number of attempts being greater than the preset number.
6. The control method of a dual fuel engine as set forth in claim 1, characterized in that the control method further includes the step of:
and according to failure of switching the dual-fuel engine to the dual-fuel mode or triggering alarm of the dual-fuel engine in the dual-fuel mode operation, controlling the alarm device to send an alarm signal.
7. The control method of a dual-fuel engine according to claim 6, wherein the dual-fuel engine is a fuel-gas dual-fuel engine, the step of controlling the alarm device to emit an alarm signal according to failure of the dual-fuel engine to switch to a dual-fuel mode or triggering an alarm in the dual-fuel mode operation comprises:
receiving a first parameter signal of the dual-fuel engine, wherein the first parameter signal comprises at least one of a water temperature signal, an oil temperature signal, a water pressure signal, an oil pressure signal, an exhaust temperature signal and a gas pressure signal;
Controlling the dual-fuel engine to operate in a fuel mode according to at least one of the water temperature signal being greater than a preset water temperature value, the oil temperature signal being greater than a preset oil temperature value, the water pressure signal being lower than a preset water pressure value, the oil pressure signal being lower than a preset oil pressure value, the exhaust temperature signal being higher than a preset exhaust temperature value and the fuel gas pressure signal being lower than a preset fuel gas pressure value, and controlling an alarm device to emit a first alarm signal;
And/or the number of the groups of groups,
Receiving a second parameter signal of the dual fuel engine, the second parameter signal comprising at least one of an engine knock signal and an engine overload signal;
and controlling the dual-fuel engine to run in a fuel mode according to the engine knocking signal representing engine knocking or the engine overload signal representing engine overload, and controlling the alarm device to send out a second alarm signal.
8. The control method of a dual-fuel engine according to any one of claims 1 to 7, characterized in that the dual-fuel engine is a fuel-gas dual-fuel engine, and the step of controlling the dual-fuel engine to switch from a fuel mode to a dual-fuel mode after operating in the fuel mode for a preset period of time according to the dual-fuel engine includes:
Receiving a rotational speed fluctuation signal and a gas pressure fluctuation signal of the dual-fuel engine;
And returning to the step of controlling the dual-fuel engine to switch from the fuel mode to the dual-fuel mode after executing the operation of the dual-fuel engine in the fuel mode for a preset duration according to the fact that the rotating speed fluctuation signal is larger than a preset rotating speed fluctuation threshold value and the fuel gas pressure fluctuation signal is larger than a preset fuel gas pressure fluctuation threshold value.
9. The control method of a dual-fuel engine according to any one of claims 1 to 7, characterized in that the dual-fuel engine is a fuel-gas dual-fuel engine, and the controlling of the dual-fuel engine to switch from a fuel mode to a dual-fuel mode includes:
and controlling the gas valve of the dual-fuel engine to be opened, and controlling the oil injection quantity to be reduced and reaching the preset ignition oil quantity.
10. A control apparatus of a dual-fuel engine for implementing the control method of a dual-fuel engine according to any one of claims 1 to 9, the dual-fuel engine being capable of switching operation between a fuel mode and a dual-fuel mode, characterized in that the control apparatus comprises:
The acquisition unit is used for acquiring a switching mode signal, a current mode signal and a current working condition signal of the dual-fuel engine;
the judging unit is used for judging whether to switch to a dual-fuel mode or a fuel mode according to the switching mode signal, the current mode signal and the current working condition signal;
The switching unit is used for switching the operation mode of the dual-fuel engine according to the judging result of the judging unit;
And the alarm unit is used for alarming according to the working condition and the switching state of the dual-fuel engine.
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