CN117780521A - Marine dual-fuel engine control method and device based on fuel injection quantity weighting - Google Patents
Marine dual-fuel engine control method and device based on fuel injection quantity weighting Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 251
- 238000002347 injection Methods 0.000 title claims abstract description 178
- 239000007924 injection Substances 0.000 title claims abstract description 178
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- 238000001914 filtration Methods 0.000 claims abstract description 33
- 230000007704 transition Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 222
- 230000009977 dual effect Effects 0.000 claims description 25
- 239000000498 cooling water Substances 0.000 claims description 16
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- 238000004422 calculation algorithm Methods 0.000 claims description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
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- 230000008859 change Effects 0.000 abstract description 11
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- 238000004364 calculation method Methods 0.000 description 5
- 239000002283 diesel fuel Substances 0.000 description 5
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- 230000009471 action Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
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- 230000002829 reductive effect Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention relates to the technical field of dual-fuel engines, in particular to a control method and a control device for a marine dual-fuel engine based on fuel injection quantity weighting. The method processes the signals through average value filtering, first-order filtering, second-order filtering and the like, reduces signal interference, enables the output of fuel injection quantity to be smooth, enables the engine to be in smooth transition in mode switching, achieves the stability and rapidity of mode switching, and effectively eliminates the hidden danger of stopping and galloping caused by abrupt load change.
Description
Technical Field
The invention relates to the technical field of dual-fuel engines, in particular to a marine dual-fuel engine control method and device based on fuel injection quantity weighting.
Background
Methanol is used as a high-efficiency clean substitute fuel with high oxygen content, high octane number, high combustion speed, and the like, and has the characteristics of good economy, low emission and the like, and has obvious advantages when being applied to the field of ship power. The problems of unclear combustion process, toxicity, precise control of fuel cooperative injection and the like of the methanol become the difficult problems for restricting the research and development of the methanol-diesel dual-fuel engine.
Currently, the operation modes of the marine methanol-diesel dual-fuel engine can be classified into a pure diesel mode, a transition mode, and a methanol-diesel dual-fuel mode. Many existing methanol dual-fuel methods are based on natural gas dual-fuel engines, but methanol is easy to fire during combustion due to the large vaporization latent heat of the methanol, and cooperative injection control is difficult, so that the traditional dual-fuel control method is difficult to be applicable to methanol. The fuel injection quantity of the existing diesel mode is mainly determined by searching an intake manifold absolute pressure (manifold absolute pressure, MAP) diagram corresponding to the actual rotating speed and the target rotating speed, the fuel injection quantity of diesel and methanol is distributed according to the low heating value of the fuel in the dual-fuel mode, and then the diesel injection quantity is increased or decreased by a certain speed, and the method has certain hysteresis, so that the real-time parameter of the engine is possibly changed excessively, and if the load suddenly changes, the engine is possibly stopped or even the engine flies directly. Furthermore, if the amount of alcohol injected in the transient mode suddenly increases from zero to a larger control output value, the sudden increase in fuel will cause the torque output of the engine to be unstable, and knocking may be generated to cause damage to the engine body. In order to solve the above problems, it is necessary to provide a control method of a dual-fuel engine, which adopts different control methods in different operation modes, adopts a strategy of fixed step length to increase the injection quantity of methanol in a transition mode, and makes the whole process smoothly transition so as to avoid abrupt change of the injection quantity of the methanol; in the dual fuel mode, the weighted multi-model prediction is adopted to distribute the injection quantity of two fuels, so that the fluctuation is small in a steady state, the real-time performance of the system is improved, and the abrupt change of the load of the engine is avoided.
Disclosure of Invention
According to a first aspect of the invention, the invention claims a control method for a marine dual fuel engine based on fuel injection quantity weighting, comprising:
after the dual-fuel engine is successfully started, the dual-fuel engine operates in a pure diesel mode, the operation parameter value of the dual-fuel engine is collected, and the basic fuel injection quantity of the dual-fuel engine is calculated;
when the operation parameter value of the dual-fuel engine meets the transition preset condition, switching the dual-fuel engine to enter a transition mode for operation, and calculating to obtain the total injection quantity of the dual-fuel engine;
when the total injection quantity meets the mixing preset condition, switching the dual-fuel engine to enter a methanol diesel dual-fuel mode for operation, and calculating to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine;
when the operation parameter value of the dual-fuel engine meets the transition preset condition, switching the dual-fuel engine to enter a transition mode for operation, and calculating to obtain the total injection quantity of the dual-fuel engine, wherein the steps are as follows:
the strategy of increasing the injection quantity of the methanol in a fixed step length is adopted, the methanol mixed combustion quantity is gradually increased from zero, and the rotation speed fluctuation caused by mixed combustion of the methanol is restrained;
according to the increasing step length, calculating to obtain a substitute fuel injection quantity, and taking the circulating fuel injection quantity as a diesel injection quantity;
and calculating the total injection quantity of the dual-fuel engine according to the fuel injection quantity.
Further, the operation parameter values of the dual-fuel engine are collected, and the basic fuel injection quantity of the dual-fuel engine is calculated, and specifically comprises the following steps:
collecting the current rotating speed, the current water temperature and the current air inlet pressure of the dual-fuel engine;
searching a MAP (MAP) corresponding to the actual rotating speed and the target rotating speed to calculate and obtain the basic fuel injection quantity of the dual-fuel engine;
and correcting the basic fuel injection quantity according to the cooling water temperature, the lubricating oil temperature and the air inlet pressure of the dual-fuel engine.
Further, the judging factors that the operation parameter value of the dual-fuel engine meets the transition preset condition include:
cooling water temperature, current rotating speed and current air inlet pressure of the dual-fuel engine.
Further, the specific steps of judging whether the cooling water temperature, the current rotating speed and the current air inlet pressure of the dual-fuel engine meet the transition preset conditions are as follows:
judging whether the cooling water temperature reaches a set minimum water temperature limit value or not through a cooling water temperature signal of the dual-fuel engine;
judging whether the lowest rotating speed of the methanol injection is allowed or not through the current rotating speed signal of the dual-fuel engine;
determining whether a minimum intake pressure allowing methanol injection has been reached by means of a current intake pressure signal of the dual fuel engine.
Further, the total injection quantity meets a mixing preset condition, specifically:
and when the total injection quantity is larger than a set value, the mixing preset condition is met.
Further, after the dual-fuel engine is switched to enter a methanol diesel dual-fuel mode operation, the following steps are carried out:
acquiring a corresponding weighting coefficient according to the current total fuel injection quantity under the same rotating speed by acquiring multi-model predictive control based on the total fuel injection quantity weighting;
the fuel injection control amount applied to the engine, which is obtained by the fuel distribution process, is calculated based on the weighting coefficient, and the final diesel injection amount and methanol injection amount are obtained.
Further, the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine are calculated, and the specific steps are as follows:
calculating to obtain the total energy required by the dual-fuel engine according to the diesel injection quantity and the heat value;
and inquiring according to the methanol substitution rate MAP to obtain the methanol substitution rate in the current working state, calculating the energy contained in the corresponding fuel, and dividing the energy by the low heat value of each fuel to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine.
Further, the method further comprises:
and processing signals by using an average value filtering method, a first-order filtering method and a second-order filtering method for the control system of the dual-fuel engine.
Further, the method further comprises:
continuously sampling an input signal, obtaining N sample values of the rotating speed of the dual-fuel engine, sequencing the N original sampling values from big to small, removing the maximum value and the minimum value, and solving the arithmetic average of the remaining N-2 data;
the signals with large deviation are weakened through a weighting algorithm, the signals are processed through first-order filtering after being collected, and second-order filtering is used in the transmission of the control injection quantity so that the output of the fuel injection quantity is smooth.
According to a second aspect of the invention, the invention claims a dual fuel engine control device based on fuel injection quantity weighting comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being programmed to perform the steps of the marine dual fuel engine control method based on fuel injection quantity weighting.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to the technical field of dual-fuel engines, in particular to a control method and a control device for a marine dual-fuel engine based on fuel injection quantity weighting. The method processes the signals through average value filtering, first-order filtering, second-order filtering and the like, reduces signal interference, enables the output of fuel injection quantity to be smooth, enables the engine to be in smooth transition in mode switching, achieves the stability and rapidity of mode switching, and effectively eliminates the hidden danger of stopping and galloping caused by abrupt load change.
Drawings
FIG. 1 is a flow chart of a method for controlling a marine dual fuel engine based on fuel injection quantity weighting as claimed in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a mode switching of a control method for a dual fuel engine for a ship based on fuel injection weighting according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a step-wise increase in the injection quantity of methanol in a marine dual fuel engine control method based on fuel injection quantity weighting according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of fuel injection amount distribution of a dual-fuel engine for a marine dual-fuel engine control method based on fuel injection amount weighting according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dual fuel engine control device based on fuel injection weighting according to an embodiment of the present invention.
Detailed Description
According to a first embodiment of the present invention, referring to fig. 1, the present invention claims a control method of a marine dual fuel engine based on weighting of fuel injection amount, comprising: after the dual-fuel engine is successfully started, the dual-fuel engine operates in a pure diesel mode, the operation parameter value of the dual-fuel engine is collected, and the basic fuel injection quantity of the dual-fuel engine is calculated; when the operation parameter value of the dual-fuel engine meets the transition preset condition, switching the dual-fuel engine to enter a transition mode for operation, and calculating to obtain the total injection quantity of the dual-fuel engine; when the total injection quantity meets the mixing preset condition, switching the dual-fuel engine to enter a methanol diesel dual-fuel mode for operation, and calculating to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine.
Referring to fig. 2, the fuel modes in this embodiment include a pure diesel mode, a transition mode, and a methanol diesel dual fuel mode; in a dual fuel engine, control factors for fuel injection control include injection timing, injection quantity, and injection schedule. The timing of the diesel injection in the controller is calibrated by an intake manifold absolute pressure (manifold absolute pressure, MAP) MAP at different speeds, and the control strategy is an oil-based strategy that allows the rotational speed output of the controlled system to approach a target value by varying the total fuel injection amount alone during rotational speed control. The injection amount calculates the rotational speed deviation and the rate of change thereof from the actual rotational speed and the target rotational speed, and then performs proportional-integral-derivative (proportional integral derivative, PID) control calculation. The output result of the PID control is the required total fuel quantity. And then the total fuel quantity of the dual-fuel engine is divided into a diesel injection quantity and a methanol injection quantity through a fuel distribution link.
Further, the operation parameter values of the dual-fuel engine are collected, and the basic fuel injection quantity of the dual-fuel engine is calculated, wherein the steps are as follows: collecting the current rotating speed, the current water temperature and the current air inlet pressure of the dual-fuel engine; searching a MAP (MAP) corresponding to the actual rotating speed and the target rotating speed to calculate and obtain the basic fuel injection quantity of the dual-fuel engine; the basic fuel injection quantity is corrected according to the cooling water temperature, the lubricating oil temperature and the air inlet pressure of the dual-fuel engine.
Wherein in this embodiment, after successful start of the dual fuel engine, the controller relies primarily on looking up MAP MAPs for actual and target speeds to determine a base fuel injection amount. In addition, in order to improve the control accuracy, the controller may also correct the fuel injection amount according to parameters such as the cooling water temperature, the lubricating oil temperature, the intake air pressure, and the like of the dual-fuel engine. Meanwhile, in order to ensure that the engine can stably run at the expected rotating speed, the rotating speed is adjusted by adopting closed-loop PID control, and the injection quantity is correspondingly corrected according to the difference value between the actual rotating speed and the target rotating speed.
The judging factors that the operation parameter value of the dual-fuel engine meets the transition preset condition include: the specific steps of judging whether the cooling water temperature, the current rotating speed and the current air inlet pressure of the dual-fuel engine meet the transition preset conditions or not are as follows: judging whether the cooling water temperature reaches a set minimum water temperature limit value or not through a cooling water temperature signal of the dual-fuel engine; judging whether the minimum rotation speed for allowing methanol to be injected is reached or not through the current rotation speed signal of the dual-fuel engine; the current intake pressure signal of the dual fuel engine is used to determine whether the lowest intake pressure that allows methanol injection has been reached. Wherein in this example the minimum water temperature limit is 50 ℃, the minimum rotational speed allowed for methanol injection is 900r/min; the lowest inlet pressure at which methanol is allowed to be injected is 0.1bar; in this embodiment, when any condition of the engine state no longer meets the above requirement while in the dual fuel mode, the control system automatically switches the fuel mode, directly stops the methanol injection and returns to the original diesel-only mode.
Further, the switching of the dual-fuel engine to enter a transition mode operation, and the calculation of the total injection quantity of the dual-fuel engine comprises the following specific steps: the strategy of increasing the injection quantity of the methanol in a fixed step length is adopted, the methanol mixed combustion quantity is gradually increased from zero, and the rotation speed fluctuation caused by mixed combustion of the methanol is restrained; according to the increasing step length, calculating to obtain a substitute fuel injection quantity, and taking the circulating fuel injection quantity as a diesel injection quantity; and calculating the total injection quantity of the dual-fuel engine according to the fuel injection quantity.
In this embodiment, the methanol injection amount is increased step by adopting a strategy of increasing the methanol injection amount in a fixed step, as shown in fig. 3, according to the calculated theoretical methanol injection amount, methanol is injected at 2% of the theoretical injection amount from the first cycle, the methanol injection amount is increased to 4% of the theoretical injection amount in the second cycle, the methanol injection amount is increased to 6% of the theoretical injection amount in the third cycle, the methanol injection amount is increased until the target injection amount in the fixed step by 2%, the methanol injection amount is slowly increased to inhibit the rotation speed fluctuation caused by the methanol injection, the diesel injection amount is correspondingly reduced according to the increase step of the methanol, the fuel injection amount of the current cycle is taken as the diesel injection amount, and the total injection amount of the dual-fuel engine is calculated according to the fuel injection amount.
Further, the total injection quantity meets a mixing preset condition, specifically: and when the total injection quantity is smaller than a set value, a mixing preset condition is met. Wherein in this example, the diesel fuel has a low heating value of 3.3X10 7 J/L, low methanolHeat value of 1.96×10 6 J/kg, because the calorific value of the methanol is low, the amount of the methanol which generates the same energy consumption by combustion is more than the amount of the diesel, so as to increase the total injection amount (methanol amount + Chai Youliang) along with the increase of the injection of the methanol, when the total injection amount is less than a set value, the mixed preset condition is met, and the dual-fuel engine is switched to enter a methanol diesel dual-fuel mode for operation; and when the total injection quantity is larger than or equal to a set theoretical value, the successful switching to the dual-fuel mode is marked.
Further, after the dual-fuel engine is switched to enter a methanol diesel dual-fuel mode operation, the following steps are carried out: acquiring a corresponding weighting coefficient according to the current total fuel injection quantity under the same rotating speed by acquiring multi-model predictive control based on the total fuel injection quantity weighting; the fuel injection control amount applied to the engine is calculated, and the fuel injection control amount is subjected to a fuel distribution process to obtain a final diesel injection amount and a methanol injection amount.
In this embodiment, the model of the model predictive control design is simplified, the state variable of the dual-fuel engine can be measured, and the linear system can meet the requirement of the predictive model as a controller. Assume thatStarting from the moment, the input of the control system is taking place +.>The step change remains unchanged after the step change, then the future ++application can be predicted from the output value of the prediction model at this time>The state of the controlled system at each moment.
Simplifying a model for model predictive control design, wherein the system is a single-input single-output linear system, and the formula is as follows: （1）
wherein: state variablesIs measurable in real time, is->For total fuel injection quantity +.>For dual fuel engine speed, < >>For an n x n state transition matrix, +.>、/>Is a constant matrix of n×1.
When the dual-fuel engineWhen it can be measured, the above-mentioned linear system can meet the requirement as a predictive model of the controller. Let us assume from->Starting at the moment, the input of the control system is taking place +.>The step change remains unchanged after the step change, then the future ++application can be predicted from the output value of the prediction model at this time>The state of the controlled system at each moment is expressed as:
（2）
expressed in the form of a matrix as:
（3）
the dual fuel engine state optimization problem at time k can be expressed herein as: the slave is determined firstStarting at the momentIndividual fuel injection control amount ∈ ->So that the controlled system is in future after the control actions are appliedThe state at each moment is calm.
The main idea of multi-model predictive control is to obtain a locally linearized model around each of its operating points for a controlled object model with strong non-linear and time-varying characteristics, and design individual controllers for the individual sub-models. In the process of realizing engine control, the control quantity actually applied to the engine is obtained by integrating the outputs of all the sub-controllers and carrying out weighted calculation according to a preset weight rule, and the method is soft switching. In the running process of the system, the control strategy is directly switched to a specific local linear model and a corresponding controller, and the method is hard switching.
Hard switching is usually based on performance metrics such as load, speed, temperature, etc. of the engine, and determines in real time the operating point at which the system is located. In the dual fuel mode, when the operating condition meets a certain condition, such as in a high load or high emission environment, the control system will switch the predictive model to a diesel or methanol combustion model that is more compatible with the operating condition. The hard switching method has a relatively high response speed when dealing with abrupt change working conditions, but may cause transient instability of the control system.
The soft switch calculates the weight coefficient of each sub-model or each controller through a certain index, such as engine performance, emission or fuel consumption, etc. The weighted control quantity is applied to the controlled object, so that the smooth switching of the working condition modes is realized. Impact during transients can be reduced, improving system stability, but more complex mathematical calculations and optimization algorithms are required.
Further, referring to fig. 4, the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine are calculated, and the specific steps are as follows: calculating to obtain the total energy required by the dual-fuel engine according to the diesel injection quantity and the heat value; and inquiring according to the methanol substitution rate MAP to obtain the methanol substitution rate in the current working state, calculating the energy contained in the corresponding fuel, and dividing the energy by the low heat value of each fuel to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine.
Wherein in this embodiment, the rotational speed output of the controlled system is made close to the target value only by changing the total fuel injection amount at the time of rotational speed control. And calculating the rotation speed deviation and the change rate of the rotation speed deviation according to the actual rotation speed and the target rotation speed by the injection quantity, and then performing PID control calculation. The output result of the PID control is the required total fuel quantity. And then the total fuel quantity of the dual-fuel engine is divided into a diesel injection quantity and a methanol injection quantity through a fuel distribution link.
Implementation case: the low heating value of the diesel oil is 3.3 multiplied by 10 7 J/L, methanol having a low heating value of 1.96×10 6 J/kg, if the current diesel consumption is 100L/h and the target substitution rate is 25%, the total energy is 3.3X10 9 J/h, methanol partial energy of 0.25X3.3X10 9 J/h, target injection amount of methanol is 0.25X3.3X10 9 /1.96×10 6 L/h, diesel oil partial energy of 0.75X3.3X10 9 J/h, target injection amount of diesel oil is 0.75X3.3X10 9 /3.3×10 7 L/h。
Further, the method further comprises: and processing signals by using an average value filtering method, a first-order filtering method and a second-order filtering method for the control system of the dual-fuel engine.
Further, the method further comprises: continuously sampling an input signal, obtaining N sample values of the rotating speed of the dual-fuel engine, sequencing the N original sampling values from big to small, removing the maximum value and the minimum value, and solving the arithmetic average of the remaining N-2 data; the signals with large deviation are weakened through a weighting algorithm, the signals are processed through first-order filtering after being collected, and second-order filtering is used in the transmission of the control injection quantity so that the output of the fuel injection quantity is smooth.
In this embodiment, since the engine control system is generally in a severe environment with numerous interference sources, such as strong electromagnetic interference and severe temperature variation, especially on the signal input channel, the accuracy of the sampling value has an important meaning on the system performance, and in the present invention, the signal is processed by using methods of average filtering, first-order filtering, second-order filtering, and the like.
Peak filtering: when the engine using the high-pressure common rail is in operation, the plunger in the high-pressure oil pump can supply high-pressure diesel oil in a pulsation mode under the driving of the rotation of the cam shaft. Since the high-pressure common rail fuel supply system is a process of intermittent fuel injection, the fuel supply pressure pulsation in the common rail pipe is caused to appear as a periodic fluctuation in the rotation angle domain. Based on this characteristic, the acquired rail pressure signal can be suitably processed in the control system in combination with this principle. The processing of the original diesel engine rail pressure signal adopts a mode of 10ms rail pressure signal peak value, and the formula is（4）。
Median average filtering: the rotational speed signal fed back during operation of a diesel engine is affected by many factors, such as uneven combustion of the cylinders of the engine, nonlinear calibration of control parameters, noise, etc. under steady-state operating conditions, so it is difficult to find a regular signal processing way to solve all negative effects in this case. For an engine electric control system, a median average filtering algorithm is an efficient and convenient signal processing means, and is mainly suitable for occasions with serious electromagnetic pulse interference. The median average filtering algorithm is applied to the rotational speed signal processing, and comprises the following steps: (1) Continuously sampling an input signal through an acquisition system to obtain N sample values of the engine speed; (2) Ordering the N original sample values to arrange the sequence from big to small, and removing the maximum value and the mostA small value; (3) calculating the arithmetic mean of the remaining N-2 data. The median average filtering algorithm can effectively eliminate sampling deviation caused by interference under the condition of serious pulse interference, and the average processing mode can filter high-frequency noise to a certain extent so that signals acquired by an engine control system are more stable and smooth. The formula is（5）。
Low pass filtering: since there are always many random interference signals during engine control, the filtering method can weaken signals with larger deviation through a weighting algorithm. During engine control, it is common to use first order filtering after signal acquisition and second order filtering in the transfer of control quantities such as injection quantities so that the output of the fuel injection quantity is smoothly limited to avoid damage to the actuator due to high frequency action.
The formula is （6）。
According to a second embodiment of the present invention, referring to fig. 5, the present invention claims a dual fuel engine control device based on fuel injection amount weighting, comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being programmed to perform the steps of the marine dual fuel engine control method based on fuel injection quantity weighting.
Those skilled in the art will appreciate that various modifications and improvements can be made to the disclosure. For example, the various devices or components described above may be implemented in hardware, software, firmware, or a combination of some or all of the three.
A flowchart is used in this disclosure to describe the steps of a method according to an embodiment of the present disclosure. It should be understood that the preceding or following steps are not necessarily performed in order precisely. Rather, the various steps may be processed in reverse order or simultaneously. Also, other operations may be added to these processes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of the methods described above may be implemented by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiment may be implemented in the form of hardware, or may be implemented in the form of a software functional module. The present disclosure is not limited to any specific form of combination of hardware and software.
Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof. Although a few exemplary embodiments of this disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this disclosure. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the claims. It is to be understood that the foregoing is illustrative of the present disclosure and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The disclosure is defined by the claims and their equivalents.
In the description of the present specification, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The marine dual-fuel engine control method based on fuel injection quantity weighting comprises the steps of operating in a pure diesel mode after the dual-fuel engine is successfully started, collecting operation parameter values of the dual-fuel engine, and calculating to obtain the basic fuel injection quantity of the dual-fuel engine, and is characterized by further comprising the following steps:
when the operation parameter value of the dual-fuel engine meets the transition preset condition, switching the dual-fuel engine to enter a transition mode for operation, and calculating to obtain the total injection quantity of the dual-fuel engine;
when the total injection quantity meets the mixing preset condition, switching the dual-fuel engine to enter a methanol diesel dual-fuel mode for operation, and calculating to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine;
when the operation parameter value of the dual-fuel engine meets the transition preset condition, switching the dual-fuel engine to enter a transition mode for operation, and calculating to obtain the total injection quantity of the dual-fuel engine, wherein the steps are as follows:
the strategy of increasing the injection quantity of the methanol in a fixed step length is adopted, the methanol mixed combustion quantity is gradually increased from zero, and the rotation speed fluctuation caused by mixed combustion of the methanol is restrained;
according to the increasing step length, calculating to obtain a substitute fuel injection quantity, and taking the circulating fuel injection quantity as a diesel injection quantity;
and calculating the total injection quantity of the dual-fuel engine according to the fuel injection quantity.
2. The control method for a marine dual-fuel engine based on fuel injection quantity weighting as claimed in claim 1, wherein the collecting the operation parameter value of the dual-fuel engine, calculating the basic fuel injection quantity of the dual-fuel engine comprises the following specific steps:
collecting the current rotating speed, the current water temperature and the current air inlet pressure of the dual-fuel engine;
searching a MAP (MAP) corresponding to the actual rotating speed and the target rotating speed to calculate and obtain the basic fuel injection quantity of the dual-fuel engine;
and correcting the basic fuel injection quantity according to the cooling water temperature, the lubricating oil temperature and the air inlet pressure of the dual-fuel engine.
3. The control method for a marine dual-fuel engine based on fuel injection quantity weighting as set forth in claim 1, wherein the judgment factor that the operation parameter value of the dual-fuel engine satisfies the transient preset condition includes:
cooling water temperature, current rotating speed and current air inlet pressure of the dual-fuel engine.
4. The control method for a marine dual-fuel engine based on fuel injection quantity weighting as set forth in claim 3, wherein the specific steps of judging whether the cooling water temperature, the current rotation speed and the current intake air pressure of the dual-fuel engine meet the transition preset conditions are as follows:
judging whether the cooling water temperature reaches a set minimum water temperature limit value or not through a cooling water temperature signal of the dual-fuel engine;
judging whether the lowest rotating speed of the methanol injection is allowed or not through the current rotating speed signal of the dual-fuel engine;
determining whether a minimum intake pressure allowing methanol injection has been reached by means of a current intake pressure signal of the dual fuel engine.
5. The marine dual fuel engine control method based on fuel injection quantity weighting as claimed in claim 1, characterized in that the total injection quantity satisfies a mixing preset condition, specifically:
and when the total injection quantity is smaller than a set value, a mixing preset condition is met.
6. The control method for a marine dual-fuel engine based on fuel injection quantity weighting as claimed in claim 1, characterized by switching the dual-fuel engine into a methanol diesel dual-fuel mode operation, and performing the following steps:
acquiring a corresponding weighting coefficient according to the current total fuel injection quantity under the same rotating speed by acquiring multi-model predictive control based on the total fuel injection quantity weighting;
the fuel injection control amount applied to the engine, which is obtained by the fuel distribution process, is calculated based on the weighting coefficient, and the final diesel injection amount and methanol injection amount are obtained.
7. The control method for a marine dual-fuel engine based on fuel injection weighting as set forth in claim 1, wherein the diesel injection and the methanol injection allocated to the dual-fuel engine are calculated as follows:
calculating to obtain the total energy required by the dual-fuel engine according to the diesel injection quantity and the heat value;
and inquiring according to the methanol substitution rate MAP to obtain the methanol substitution rate in the current working state, calculating the energy contained in the corresponding fuel, and dividing the energy by the low heat value of each fuel to obtain the diesel injection quantity and the methanol injection quantity distributed by the dual-fuel engine.
8. The control method for a marine dual fuel engine based on weighting of fuel injection amounts as claimed in claim 1, further comprising:
and processing signals by using an average value filtering method, a first-order filtering method and a second-order filtering method for the control system of the dual-fuel engine.
9. The control method for a marine dual fuel engine based on weighting of fuel injection quantity as set forth in claim 8, further comprising:
continuously sampling an input signal, obtaining N sample values of the rotating speed of the dual-fuel engine, sequencing the N original sampling values from big to small, removing the maximum value and the minimum value, and solving the arithmetic average of the remaining N-2 data;
the signals with large deviation are weakened through a weighting algorithm, the signals are processed through first-order filtering after being collected, and second-order filtering is used in the transmission of the control injection quantity so that the output of the fuel injection quantity is smooth.
10. The control device of the dual-fuel engine based on the fuel injection quantity weighting is characterized in that a processor comprises a power supply module, signals of a rotating speed, a cam shaft, cooling water and an air inlet temperature pressure sensor are collected into the processor and put into a memory; the driving circuit controls the executing mechanism, and CAN communication is realized and communicated with the upper computer; wherein the memory stores instructions executable by the processor, the instructions being programmed to perform the steps of a marine dual fuel engine control method based on fuel injection quantity weighting as claimed in any one of claims 1 to 9.
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