CN115013169A - Mode switching method and device of dual-fuel engine - Google Patents
Mode switching method and device of dual-fuel engine Download PDFInfo
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- CN115013169A CN115013169A CN202210405584.5A CN202210405584A CN115013169A CN 115013169 A CN115013169 A CN 115013169A CN 202210405584 A CN202210405584 A CN 202210405584A CN 115013169 A CN115013169 A CN 115013169A
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0613—Switch-over from one fuel to another
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The application provides a mode switching method and a mode switching device of a dual-fuel engine, wherein the mode switching method comprises the following steps: triggering the dual-fuel engine to be switched from a first mode to a second mode, wherein the first mode is one of the dual-fuel mode and the diesel mode, the second mode is the other one of the dual-fuel mode and the diesel mode, determining an initial fuel value of the second mode to be switched according to the current engine rotating speed, then modifying an accumulated value of an I integrator of a PID controller into the initial fuel value, latching a historical fuel value of the first mode output by a previous step length of the PID controller, finally slowly increasing the initial fuel value of the second mode by utilizing the PID function, reducing the historical fuel value of the first mode, and adopting the same PID closed-loop logic under different engine control modes to realize seamless switching and realize stable switching between the two modes of the dual-fuel engine.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a mode switching method and device of a dual-fuel engine.
Background
Current vehicles can have a dual fuel engine installed therein, which has two modes when generating electricity: dual fuel mode and pure diesel mode. The dual fuel mode is an engine control mode having both diesel and gas as fuel, wherein a small amount of diesel is used for ignition and a large amount of gas is used for power generation. The pure diesel mode is an engine control mode in which only diesel is used as fuel.
Generally, the dual-fuel mode is switched before the two engine modes are switched, and how to realize smooth switching of the engine control mode is a key problem about vehicle safety.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a mode switching method and device for a dual-fuel engine, which can realize smooth switching of an engine control mode.
The embodiment of the application provides a mode switching method of a dual-fuel engine, which comprises the following steps:
triggering the dual-fuel engine to switch from a first mode to a second mode, the first mode being one of a dual-fuel mode and a diesel mode, the second mode being the other of the dual-fuel mode and the diesel mode;
determining an initial fuel value for the second mode based on a current speed of the engine;
resetting an accumulated value of an integrator I in a proportional-integral-derivative PID controller to an initial fuel value of the second mode and latching a historical fuel value of the first mode output by the PID controller;
gradually and slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode to realize mode switching of the dual-fuel engine.
Optionally, the first mode is a dual-fuel mode, the second mode is a diesel mode, the initial fuel value is a minimum diesel injection quantity, the historical fuel value is a historical gas injection quantity, and the real-time fuel value is a first real-time diesel injection quantity;
resetting the accumulated value of integrator I in the PID controller to the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller comprises:
resetting the accumulated value of the integrator I to the minimum diesel injection quantity and latching the historical gas injection quantity output by the PID controller;
the gradually slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, the gradually slowly decreasing the historical fuel value of the first mode comprising:
the first real-time diesel injection quantity output by the PID controller gradually and slowly increases from the minimum diesel injection quantity, and the historical fuel gas injection quantity gradually and slowly decreases to 0.
Optionally, the first mode is a diesel mode, the second mode is a dual-fuel mode, the initial fuel value is a gas integration initial value, the historical fuel value is a historical diesel injection amount, and the real-time fuel value is a real-time gas injection amount;
resetting the accumulated value of integrator I in the PID controller to the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller comprises:
resetting the accumulated value of the integrator I to the gas integration initial value and latching the historical diesel injection quantity output by the PID controller;
the gradually slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, the gradually slowly decreasing the historical fuel value of the first mode comprising:
the real-time gas injection quantity output by the PID controller gradually increases from the gas integral initial value, and the historical diesel oil injection quantity gradually and slowly decreases to the diesel oil minimum injection quantity.
Optionally, the historical diesel injection amount is gradually and slowly reduced to the diesel minimum injection amount, and a second real-time diesel injection amount is included;
the gradually slowly decreasing historical diesel injection quantity to the diesel minimum injection quantity includes:
and adjusting the second real-time diesel injection amount according to the deviation between the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection amount is reduced to the minimum diesel injection amount.
Optionally, the gas integral initial value is 0.
Optionally, the determining the initial fuel value for the second mode based on the current speed of the engine comprises:
and determining the initial fuel value of the second mode according to the current rotating speed of the engine and the intake intercooled downstream pressure by a two-dimensional lookup table.
The embodiment of the application provides a mode switching device of a dual-fuel engine, which comprises:
the control device comprises a triggering unit, a control unit and a control unit, wherein the triggering unit is used for triggering the dual-fuel engine to be switched from a first mode to a second mode, the first mode is one of a dual-fuel mode and a diesel mode, and the second mode is the other one of the dual-fuel mode and the diesel mode;
a determination unit for determining an initial fuel value of the second mode according to a current rotation speed of an engine;
a reset unit for resetting an integrated value of an integrator I in a proportional-integral-derivative PID controller to an initial fuel value of the second mode and latching a history fuel value of the first mode output by the PID controller;
and the switching unit is used for gradually and slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value and gradually and slowly decreasing the historical fuel value of the first mode so as to realize mode switching of the dual-fuel engine.
Optionally, the first mode is a dual-fuel mode, the second mode is a diesel mode, the initial fuel value is a minimum diesel injection quantity, the historical fuel value is a historical gas injection quantity, and the real-time fuel value is a first real-time diesel injection quantity;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the minimum diesel injection quantity and latching the historical fuel gas injection quantity output by the PID controller;
the switching unit is specifically configured to:
the first real-time diesel injection quantity output by the PID controller gradually and slowly increases from the minimum diesel injection quantity, and the historical fuel gas injection quantity gradually and slowly decreases to 0.
Optionally, the first mode is a diesel mode, the second mode is a dual-fuel mode, the initial fuel value is a gas integration initial value, the historical fuel value is a historical diesel injection amount, and the real-time fuel value is a real-time gas injection amount;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the gas integration initial value and latching the historical diesel injection quantity output by the PID controller;
the switching unit is specifically configured to:
the real-time gas injection quantity output by the PID controller gradually increases from the gas integral initial value, and the historical diesel oil injection quantity gradually and slowly decreases to the diesel oil minimum injection quantity.
Optionally, the historical diesel injection amount is gradually and slowly reduced to the diesel minimum injection amount, and a second real-time diesel injection amount is included;
the switching unit is specifically configured to:
and adjusting the second real-time diesel injection amount according to the deviation between the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection amount is reduced to the minimum diesel injection amount.
The mode switching method of the dual-fuel engine provided by the embodiment of the application comprises the following steps: triggering the dual-fuel engine to switch from a first mode to a second mode, wherein the first mode is one of the dual-fuel mode and the diesel mode, the second mode is the other one of the dual-fuel mode and the diesel mode, determining an initial fuel value of the second mode according to the current rotating speed of the engine, resetting an accumulated value of an integrator I in a proportional-integral-derivative PID controller to the initial fuel value of the second mode and latching a historical fuel value of the first mode output by the PID controller, gradually and slowly increasing a real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode to realize the mode switching of the dual-fuel engine. That is to say, the embodiment of the present application determines the initial fuel value of the second mode to be switched to according to the current engine speed, then modifies the accumulated value of the I integrator of the PID controller to the initial fuel value, latches the historical fuel value of the first mode output by the PID controller in one previous step, and finally slowly increases the initial fuel value of the second mode by using the function of PID, and reduces the historical fuel value of the first mode.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a mode switching method for a dual-fuel engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart diagram illustrating another method for mode switching for a bi-fuel engine in accordance with an embodiment of the present application;
fig. 3 shows a schematic structural diagram of a mode switching device of a dual-fuel engine according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
The current vehicle can be equipped with a dual-fuel engine, which has two modes when generating electricity: dual fuel mode and pure diesel mode. The dual fuel mode is an engine control mode having both diesel and gas as fuel, wherein a small amount of diesel is used for ignition and a large amount of gas is used for power generation. The pure diesel mode is an engine control mode in which only diesel is used as fuel.
When the dual-fuel engine works normally, a dual-fuel mode is utilized, a small amount of diesel oil plays a role in ignition, and a large amount of fuel gas plays a role in doing work. And in the case of serious failure of the dual-fuel mode, switching to a pure diesel mode. When the critical fault is cured, the engine is triggered to switch from the pure diesel mode to the dual fuel mode.
Therefore, in general, the dual-fuel mode is switched before the two engine modes are switched, and how to realize smooth switching of the engine control mode is a key problem about vehicle safety.
In addition, when the dual-fuel mode is switched to the pure diesel mode, improper control can cause great fluctuation of the engine speed, namely, the mode switching is not smooth, and the power generation quality of the engine can be influenced.
Based on this, the mode switching method of the dual-fuel engine provided by the embodiment of the application comprises the following steps: triggering the dual-fuel engine to switch from a first mode to a second mode, wherein the first mode is one of the dual-fuel mode and the diesel mode, the second mode is the other one of the dual-fuel mode and the diesel mode, determining an initial fuel value of the second mode according to the current rotating speed of the engine, resetting an accumulated value of an integrator I in a proportional-integral-derivative PID controller to the initial fuel value of the second mode and latching a historical fuel value of the first mode output by the PID controller, gradually and slowly increasing a real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode to realize the mode switching of the dual-fuel engine. That is to say, the embodiment of the present application determines the initial fuel value of the second mode to be switched to according to the current engine speed, then modifies the integrated value of the I integrator of the PID controller to the initial fuel value, latches the historical fuel value of the first mode output by the PID controller in one step, and finally slowly increases the initial fuel value of the second mode by using the function of PID, and reduces the historical fuel value of the first mode.
For better understanding of the technical solutions and effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a schematic flow chart of a mode switching method of a dual-fuel engine according to an embodiment of the present application.
The mode switching method of the dual-fuel engine provided by the embodiment comprises the following steps:
and S101, triggering the dual-fuel engine to switch from the first mode to the second mode.
In embodiments of the present application, a dual fuel engine has two modes: dual fuel mode and pure diesel mode. The dual fuel mode is an engine control mode having both diesel and gas as fuel, wherein a small amount of diesel is used for ignition and a large amount of gas is used for power generation. The pure diesel mode is an engine control mode in which only diesel is used as fuel. Wherein the gas may be natural gas.
In the pure diesel mode, diesel is injected into the cylinders of the engine through diesel injection valves mounted on the cylinder heads.
In the dual fuel mode, fuel gas is injected into the intake pipe through a natural gas injection valve installed on the intake manifold, mixed with air, and then introduced into the cylinders of the engine.
In an embodiment of the application, a mode switch of the bi-fuel engine may be triggered, for example from a first mode to a second mode, wherein the first mode is one of a bi-fuel mode and a diesel mode and the second mode is the other of the bi-fuel mode and the diesel mode.
As an example, the first mode is a dual fuel mode and the second mode is a diesel only mode, i.e., the dual fuel engine is triggered to switch from the dual fuel mode to the diesel only mode.
As another example, the first mode is a diesel only mode and the second mode is a bi-fuel mode, i.e., triggering the bi-fuel engine to switch from the diesel only mode to the bi-fuel mode.
And S102, determining an initial fuel value of the second mode according to the current rotating speed of the engine.
In an embodiment of the present application, in order to smoothly switch the first mode to the second mode, an initial fuel value of the second mode may be determined according to a current rotation speed of the engine.
Specifically, a two-dimensional look-up table may be used to determine the initial fuel value for the second mode based on the current engine speed and the charge-air intercooled downstream pressure.
As one example, the first mode is a dual fuel mode, the second mode is a pure diesel mode, and the initial fuel value is a minimum amount of diesel injected.
As another example, the first mode is a pure diesel mode, the second mode is a dual fuel mode, and the initial fuel value is the initial value of the gas integral.
And S103, resetting the accumulated value of the integrator I in the PID controller to be the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller.
In an embodiment of the present application, the accumulated value of the integrator I in the PID controller may be reset to the initial fuel value of the second mode while latching the historical fuel value of the first mode output one step on the PID controller.
As an example, if the first mode is a dual fuel mode, the second mode is a pure diesel mode, the historical fuel value is the historical gas injection amount, and the initial fuel value is the minimum diesel injection amount, the accumulated value of the integrator I may be reset to the minimum diesel injection amount and the historical gas injection amount output by the PID controller may be latched.
As another example, if the first mode is a pure diesel mode, the second mode is a dual fuel mode, the historical fuel value is the historical diesel injection amount, and the initial fuel value is the gas integral initial value, the accumulated value of the integrator I may be reset to the gas integral initial value and the historical diesel injection amount output by the PID controller may be latched.
And S104, gradually and slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode.
In the embodiment of the application, after the accumulated value of the integrator I in the PID controller is reset to the initial fuel value of the second mode, the output of the PID controller is the real-time fuel value of the second mode, so that the real-time fuel value of the second mode output by the PID controller can be gradually and slowly increased from the initial fuel value, and the historical fuel value of the Ramp first mode can be gradually and slowly decreased, so as to realize the mode switching of the dual-fuel engine.
As an example, the first mode is a dual-fuel mode, the second mode is a pure diesel mode, the historical fuel value is a historical gas injection amount, the initial fuel value is a diesel minimum injection amount, and the real-time fuel value is a first real-time diesel injection amount, then the first real-time diesel injection amount output by the PID controller gradually and slowly increases from the diesel minimum injection amount, and the historical gas injection amount gradually and slowly decreases Ramp to 0.
As another example, the first mode is a pure diesel mode, the second mode is a dual-fuel mode, the historical fuel value is a historical diesel injection amount, the initial fuel value is a gas integral initial value, and the real-time fuel value is a real-time gas injection amount, so that the real-time gas injection amount output by the PID controller gradually increases from the gas integral initial value, and the historical diesel injection amount gradually decreases Ramp to a diesel minimum injection amount.
In practical application, when the dual-fuel engine is switched from a pure diesel mode to a dual-fuel mode, the fuel gas injection amount gradually rises, the diesel fuel injection amount gradually decreases, fuel gas is injected into an air inlet pipe through a natural gas injection valve installed on an air inlet main pipe, the fuel gas is mixed with air and then enters a cylinder of the engine, and diesel fuel is directly injected into the cylinder through a diesel fuel injection valve installed on a cylinder cover, so that the response of the engine to the fuel gas is slow compared with the response of the diesel fuel, and finally the rotation speed of the engine fluctuates.
The historical diesel injection quantity is gradually and slowly reduced to the minimum diesel injection quantity and comprises a second real-time diesel injection quantity, and the second real-time diesel injection quantity can be adjusted according to the deviation of the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection quantity is reduced to the minimum diesel injection quantity. That is to say, when the dual-fuel engine is switched to the dual-fuel mode in the pure diesel mode, the diesel injection quantity can be corrected in real time according to the deviation between the preset rotating speed and the actual rotating speed of the engine, and the rotating speed of the engine is guaranteed to be stable.
When the deviation between the preset rotating speed and the actual rotating speed of the engine is large, the deviation of the amount of fuel gas entering the cylinder is large compared with the deviation of the preset amount, and at the moment, the diesel oil injection amount can be increased so as to ensure the stable rotating speed of the engine.
In practical application, when the dual-fuel engine is switched from the pure diesel mode to the dual-fuel mode, the real-time gas injection quantity output by the PID controller gradually increases from a gas integration initial value, wherein the gas integration initial value may be 0, that is, the gas increases from 0, and the gas integration initial value may not be 0, so as to save the response time of the change of the value of the integrator I.
In the embodiment of the application, when the mode switching is not performed, the diesel injection quantity in the pure diesel mode is output through a PID closed loop, and the fuel gas injection quantity in the dual-fuel mode is obtained through the PID closed loop according to the deviation between the set rotating speed and the actual rotating speed. That is to say, the embodiment of the present application adopts the same set of PID closed-loop logic in different modes, and the variable meanings of different closed-loop outputs in different modes are different, thereby realizing seamless switching. Meanwhile, in the process of switching from the pure diesel mode to the dual-fuel mode, the problem of large fluctuation of the rotating speed caused by the deterioration of the quality of fuel gas can be solved, the rotating speed of the engine is stable in the switching process, and the power generation quality is ensured.
Referring to fig. 2, a schematic flow chart of a mode switching method of a dual-fuel engine according to an embodiment of the present application is shown.
As shown in the figure, in the working process of the dual-fuel engine, whether the engine has serious faults or not is monitored in real time, for example, the fault of a gas nozzle causes the abnormal injection of gas, and the like, and when the serious faults occur, the engine is triggered to be switched from the dual-fuel mode to the pure diesel mode. When the engine is detected to be switched from the dual-fuel mode to the pure diesel mode, the minimum fuel injection quantity of the diesel under the current working condition is obtained according to the engine rotating speed and the intake air inter-cooling downstream pressure two-dimensional table lookup, then the accumulated value of the I integrator is reset to be the minimum fuel injection quantity of the diesel under the current working condition according to the mode switching state, meanwhile, the fuel gas injection quantity output in one step length on the PID closed loop is latched, the fuel gas injection quantity is gradually Ramp to 0, the diesel fuel injection quantity output through the PID closed loop is gradually increased along with the gradual reduction of the fuel gas injection quantity, when the fuel gas injection quantity Ramp is 0, the mode switching is completed, and in the switching process, the diesel fuel injection quantity can be corrected according to the deviation of the set rotating speed and the actual rotating speed.
When the critical fault is cured, the engine is triggered to switch from the pure diesel mode to the dual fuel mode. When the engine is detected to be switched from a pure diesel mode to a dual-fuel mode, two-dimensional lookup is carried out according to the engine speed and the downstream pressure of the intake intercooler to obtain an integral initial value of natural gas under the current working condition, then the accumulated value of the I integrator is reset to be the integral initial value of the natural gas under the current working condition according to the mode switching state, the diesel injection quantity output by a step length on a PID closed loop is latched at the same time, the diesel injection quantity Ramp is enabled to reach the minimum diesel injection quantity under the current working condition obtained through the two-dimensional lookup, the fuel injection quantity output by the PID closed loop is gradually increased along with the gradual reduction of the diesel injection quantity, whether the current engine speed fluctuates or not can be judged in the switching process, if the fluctuation exists, the diesel injection quantity can be corrected according to the set speed and the actual speed deviation of the engine, and the stable rotating speed is ensured. And when the diesel injection amount Ramp reaches the minimum diesel injection amount under the current working condition, completing the mode switching.
The mode switching method of the dual-fuel engine provided by the embodiment of the application comprises the following steps: triggering the dual-fuel engine to switch from a first mode to a second mode, wherein the first mode is one of the dual-fuel mode and the diesel mode, the second mode is the other one of the dual-fuel mode and the diesel mode, determining an initial fuel value of the second mode according to the current rotating speed of the engine, resetting an accumulated value of an integrator I in a proportional-integral-derivative PID controller to the initial fuel value of the second mode and latching a historical fuel value of the first mode output by the PID controller, gradually and slowly increasing a real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode to realize the mode switching of the dual-fuel engine. That is to say, the embodiment of the present application determines the initial fuel value of the second mode to be switched to according to the current engine speed, then modifies the integrated value of the I integrator of the PID controller to the initial fuel value, latches the historical fuel value of the first mode output by the PID controller in one step, and finally slowly increases the initial fuel value of the second mode by using the function of PID, and reduces the historical fuel value of the first mode.
Based on the mode switching method of the dual-fuel engine provided by the above embodiment, the embodiment of the present application further provides a mode switching device of the dual-fuel engine, and the working principle thereof is described in detail below with reference to the accompanying drawings.
Referring to fig. 3, the drawing is a block diagram of a mode switching device of a dual-fuel engine according to an embodiment of the present application.
The mode switching device 300 of the dual-fuel engine provided by the embodiment comprises:
a triggering unit 310 for triggering the dual-fuel engine to switch from a first mode to a second mode, the first mode being one of a dual-fuel mode and a diesel mode, the second mode being the other of the dual-fuel mode and the diesel mode;
a determining unit 320 for determining an initial fuel value of the second mode according to a current speed of the engine;
a resetting unit 330 for resetting the accumulated value of the integrator I in the PID controller to the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller;
the switching unit 340 is configured to gradually and slowly increase the real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decrease the historical fuel value of the first mode, so as to implement mode switching of the dual-fuel engine.
Optionally, the first mode is a dual-fuel mode, the second mode is a diesel mode, the initial fuel value is a minimum diesel injection quantity, the historical fuel value is a historical gas injection quantity, and the real-time fuel value is a first real-time diesel injection quantity;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the minimum diesel injection quantity and latching the historical gas injection quantity output by the PID controller;
the switching unit is specifically configured to:
the first real-time diesel injection quantity output by the PID controller gradually and slowly increases from the minimum diesel injection quantity, and the historical fuel gas injection quantity gradually and slowly decreases to 0.
Optionally, the first mode is a diesel mode, the second mode is a dual-fuel mode, the initial fuel value is a gas integration initial value, the historical fuel value is a historical diesel injection amount, and the real-time fuel value is a real-time gas injection amount;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the gas integration initial value and latching the historical diesel injection quantity output by the PID controller;
the switching unit is specifically configured to:
the real-time gas injection quantity output by the PID controller gradually increases from the gas integral initial value, and the historical diesel oil injection quantity gradually and slowly decreases to the diesel oil minimum injection quantity.
Optionally, the historical diesel injection amount is gradually and slowly reduced to the diesel minimum injection amount, and a second real-time diesel injection amount is included;
the switching unit is specifically configured to:
and adjusting the second real-time diesel injection quantity according to the deviation between the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection quantity is reduced to the minimum diesel injection quantity.
Optionally, the gas integral initial value is 0.
Optionally, the determining unit is specifically configured to:
and determining the initial fuel value of the second mode according to the current rotating speed of the engine and the intake intercooled downstream pressure by a two-dimensional lookup table.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
It should be noted that, a person skilled in the art can understand that all or part of the processes in the above method embodiments can be implemented by a computer program to instruct related hardware, where the program can be stored in a computer readable storage medium, and when executed, the program can include the processes in the above method embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is merely a preferred embodiment of the present application and, although the present application discloses the foregoing preferred embodiments, the present application is not limited thereto. Those skilled in the art can make numerous possible variations and modifications to the disclosed solution, or modify it to equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are still within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A mode switching method for a dual fuel engine, comprising:
triggering the dual-fuel engine to switch from a first mode to a second mode, the first mode being one of a dual-fuel mode and a diesel mode, the second mode being the other of the dual-fuel mode and the diesel mode;
determining an initial fuel value for the second mode based on a current speed of the engine;
resetting an accumulated value of an integrator I in a proportional-integral-derivative PID controller to an initial fuel value of the second mode and latching a historical fuel value of the first mode output by the PID controller;
gradually and slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, and gradually and slowly decreasing the historical fuel value of the first mode to realize the mode switching of the dual-fuel engine.
2. The method of claim 1, wherein the first mode is a dual fuel mode, the second mode is a diesel mode, the initial fuel value is a diesel minimum injection amount, the historical fuel value is a historical gas injection amount, and the real-time fuel value is a first real-time diesel injection amount;
resetting the accumulated value of integrator I in the PID controller to the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller comprises:
resetting the accumulated value of the integrator I to the minimum diesel injection quantity and latching the historical gas injection quantity output by the PID controller;
the gradually slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, the gradually slowly decreasing the historical fuel value of the first mode comprising:
the first real-time diesel injection quantity output by the PID controller gradually and slowly increases from the minimum diesel injection quantity, and the historical fuel gas injection quantity gradually and slowly decreases to 0.
3. The method of claim 1, wherein the first mode is a diesel mode, the second mode is a dual fuel mode, the initial fuel value is a gas integral initial value, the historical fuel value is a historical diesel injection quantity, and the real-time fuel value is a real-time gas injection quantity;
resetting the accumulated value of integrator I in the PID controller to the initial fuel value of the second mode and latching the historical fuel value of the first mode output by the PID controller comprises:
resetting the accumulated value of the integrator I to the gas integration initial value and latching the historical diesel injection quantity output by the PID controller;
the gradually slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value, the gradually slowly decreasing the historical fuel value of the first mode comprising:
the real-time gas injection quantity output by the PID controller gradually increases from the gas integral initial value, and the historical diesel oil injection quantity gradually and slowly decreases to the diesel oil minimum injection quantity.
4. The method of claim 3, wherein the gradual slow decrease of the historical diesel injection quantity to the minimum diesel injection quantity comprises a second real-time diesel injection quantity;
the gradually slowly decreasing historical diesel injection quantity to the diesel minimum injection quantity includes:
and adjusting the second real-time diesel injection quantity according to the deviation between the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection quantity is reduced to the minimum diesel injection quantity.
5. The method of claim 3, wherein the gas integral initial value is 0.
6. The method of any one of claims 1-5, wherein said determining an initial fuel value for said second mode based on a current engine speed comprises:
and determining the initial fuel value of the second mode by performing a two-dimensional lookup table according to the current rotating speed of the engine and the intake charge cold downstream pressure.
7. A mode switching device for a dual fuel engine, comprising:
the control device comprises a triggering unit, a control unit and a control unit, wherein the triggering unit is used for triggering the dual-fuel engine to be switched from a first mode to a second mode, the first mode is one of a dual-fuel mode and a diesel mode, and the second mode is the other one of the dual-fuel mode and the diesel mode;
a determination unit for determining an initial fuel value of the second mode according to a current rotation speed of an engine;
a reset unit for resetting an integrated value of an integrator I in a PID controller to an initial fuel value of the second mode and latching a history fuel value of the first mode output by the PID controller;
and the switching unit is used for gradually and slowly increasing the real-time fuel value of the second mode output by the PID controller from the initial fuel value and gradually and slowly decreasing the historical fuel value of the first mode so as to realize mode switching of the dual-fuel engine.
8. The apparatus of claim 7, wherein the first mode is a dual fuel mode, the second mode is a diesel mode, the initial fuel value is a minimum amount of diesel injected, the historical fuel value is a historical amount of gas injected, and the real-time fuel value is a first real-time amount of diesel injected;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the minimum diesel injection quantity and latching the historical gas injection quantity output by the PID controller;
the switching unit is specifically configured to:
the first real-time diesel injection quantity output by the PID controller gradually and slowly increases from the minimum diesel injection quantity, and the historical fuel gas injection quantity gradually and slowly decreases to 0.
9. The apparatus of claim 7, wherein the first mode is a diesel mode, the second mode is a dual fuel mode, the initial fuel value is a gas integral initial value, the historical fuel value is a historical diesel injection quantity, and the real-time fuel value is a real-time gas injection quantity;
the reset unit is specifically configured to:
resetting the accumulated value of the integrator I to the gas integration initial value and latching the historical diesel injection quantity output by the PID controller;
the switching unit is specifically configured to:
the real-time gas injection quantity output by the PID controller gradually increases from the gas integral initial value, and the historical diesel oil injection quantity gradually and slowly decreases to the minimum diesel oil injection quantity.
10. The apparatus of claim 9, wherein the gradual slow decrease of the historical diesel injection quantity to the minimum diesel injection quantity comprises a second real-time diesel injection quantity;
the switching unit is specifically configured to:
and adjusting the second real-time diesel injection quantity according to the deviation between the current rotating speed and the preset rotating speed of the engine until the second real-time diesel injection quantity is reduced to the minimum diesel injection quantity.
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