CN112832918A - Combustion closed-loop control method based on fuel injection characteristic parameters of engine fuel injector - Google Patents
Combustion closed-loop control method based on fuel injection characteristic parameters of engine fuel injector Download PDFInfo
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- CN112832918A CN112832918A CN202011522068.8A CN202011522068A CN112832918A CN 112832918 A CN112832918 A CN 112832918A CN 202011522068 A CN202011522068 A CN 202011522068A CN 112832918 A CN112832918 A CN 112832918A
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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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
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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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/001—Measuring fuel delivery of a fuel injector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
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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
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a combustion closed-loop control method based on oil injection characteristic parameters of an engine oil injector, which comprises the following steps: acquiring off-line injection characteristic parameter information of the oil injector corresponding to different engine working conditions, and extracting reference parameter characteristic points corresponding to the needle valve action of the oil injector according to each group of off-line injection characteristic parameter information; in the actual operation process of an engine, acquiring real-time injection characteristic parameter information of the oil injector, and extracting real-time parameter characteristic points corresponding to the needle valve action according to the real-time injection characteristic parameter information; and performing closed-loop optimization control on the real-time injection characteristic parameters according to the comparison result of the real-time parameter characteristic points and the reference parameter characteristic points. According to the control method, high-precision test and prediction calculation of the on-line oil injection characteristic parameters of the oil injector can be realized, and real-time correction of oil injection timing and control pulse width is realized through the ECU and the signal post-processing module.
Description
Technical Field
The invention relates to the technical field of marine engine equipment, in particular to a combustion closed-loop control method based on oil injection characteristic parameters of an engine oil injector.
Background
The combustion closed-loop control technology for accurately controlling the combustion process by adjusting performance control parameters such as fuel injection, gas distribution and the like of the engine through feedback of the combustion state in the cylinder is the development trend of intellectualization of marine diesel engines in the future.
The oil injection parameters which can be tested on line by the existing high-pressure common rail diesel engine comprise common rail pressure, and control parameters of oil injection timing and injection pulse width output by an ECU (electronic control unit); and the closed-loop control of the oil injection parameters is realized through the feedback of the signals of the rotating speed and the torque of the engine.
The correction coefficients of the fuel injection strategy such as fuel injection timing and power-on pulse width are stored in the ECU in a MAP form after a calibration test is solidified, and the table look-up is carried out according to the operating condition of the engine, so that the real-time correction of the fuel injection timing and the power-on pulse width along with the performance attenuation of the fuel injector and the change of the operating environment of the engine cannot be realized. And the sampling frequency and the characteristic quantity extraction precision of the rail pressure sensor are not enough to meet the requirement of combustion closed-loop control.
Accordingly, a closed-loop control method for combustion based on injection characteristic parameters of an engine injector is provided to at least partially address the above issues.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to at least partially solve the above problems, the present invention provides a closed-loop control method for combustion based on injection characteristic parameters of an injector of an engine, the control method comprising:
acquiring off-line injection characteristic parameter information of an oil injector corresponding to different engine working conditions, and extracting reference parameter characteristic points corresponding to the needle valve action of the oil injector according to each group of off-line injection characteristic parameter information;
in the actual operation process of an engine, acquiring real-time injection characteristic parameter information of the oil injector, and extracting real-time parameter characteristic points corresponding to the needle valve action according to the real-time injection characteristic parameter information;
and performing closed-loop optimization control on the real-time injection characteristic parameters according to the comparison result of the real-time parameter characteristic points and the reference parameter characteristic points.
According to the combustion closed-loop control method based on the fuel injection characteristic parameters of the engine fuel injector, high-precision testing and prediction calculation of the real-time injection characteristic parameters of each cylinder can be realized, and real-time correction of fuel injection timing and control pulse width is realized through the ECU and the signal post-processing module.
Preferably, the mapping relation between the offline injection characteristic parameter and the reference parameter characteristic point under each engine working condition is pre-stored in a control module of the engine to form a database to be called.
Therefore, under a certain working condition of real-time operation of the engine, the ECU can call the reference parameter characteristic points of the off-line injection characteristics corresponding to the working condition in the database so as to compare and analyze the reference parameter characteristic points with the real-time parameter characteristic points, and finally, the real-time parameter characteristic points are quickly and accurately subjected to closed-loop optimization control.
Preferably, the injection characteristic parameter information of the injector includes at least: pressure curve of oil tank of oil injector.
Preferably, extracting a parameter feature point corresponding to the needle valve action of the injector according to the injection characteristic parameter information includes:
and determining fuel pressure characteristic points of a needle valve opening point, a needle valve descending point and a needle valve seating point on a pressure curve of an oil containing groove of the oil injector.
It will be appreciated that the above can be used both during off-line testing of the fuel injector and during real-time operation of the engine, namely: and determining fuel pressure characteristic points of a needle valve opening point, a needle valve descending point and a needle valve seating point on a pressure curve of an oil containing groove of the oil injector. And in the off-line testing process, extracting reference parameter characteristic points according to off-line injection characteristic parameter information, and in the real-time running process, extracting real-time parameter characteristic points according to the real-time injection characteristic parameter information.
Preferably, the fuel pressure characteristic point of the opening point of the needle valve is a starting point of the pressure starting to greatly decrease on a pressure curve of an oil containing groove of the oil injector; the fuel pressure characteristic point of the needle valve descending point is a pressure wave valley point in a pressure descending stage on a pressure curve of an oil containing groove of the oil sprayer; the fuel pressure characteristic point of the needle valve seating point is the first pressure wave peak point on the pressure curve of the oil containing groove of the oil sprayer from the moment of power failure of the needle valve.
Therefore, the parameter characteristic points corresponding to the action of the needle valve can be intuitively and accurately acquired on the pressure curve of the oil containing groove of the oil injector.
Preferably, the injection characteristic parameter information of the injector further includes: the oil inlet pipe of the oil sprayer is connected with a pressure curve and a pressure accumulation cavity pressure curve at the head of the oil sprayer.
Preferably, extracting a parameter feature point corresponding to the needle valve action of the injector according to the injection characteristic parameter information includes:
taking fuel pressure characteristic points corresponding to a needle valve opening point, a needle valve descending point and a needle valve seating point on a pressure curve of an oil containing groove of the oil sprayer as references, and respectively extracting pressure characteristic points corresponding to the fuel pressure characteristic points on a pressure curve of an oil inlet pipe of the oil sprayer and a pressure curve of a pressure accumulating cavity at the head of the oil sprayer
Therefore, pressure characteristic points on a pressure curve of an oil inlet pipe of the oil sprayer and on a pressure accumulation cavity of the head of the oil sprayer can be accurately extracted, and quality assurance is provided for comparative analysis of the subsequent real-time pressure characteristic points and the reference pressure characteristic points.
Preferably, the pressure characteristic points are pressure inflection points which are not changed along with the common rail pressure and the injection pulse width of the injector from each fuel pressure characteristic point on a pressure curve of a fuel inlet pipe of the injector and a pressure curve of a pressure accumulation cavity at the head part of the injector.
This enables accurate extraction of pressure characteristic points on each pressure curve.
Preferably, the injection characteristic parameters further include: timing of injection, pulse width of injection, single injection amount of oil, duration of injection, and injection rate profile.
Preferably, the closed-loop optimization control of the real-time injection characteristic parameters at least comprises: the method comprises the steps of closed-loop optimization control of fuel injection timing, closed-loop optimization control of injection pulse width and closed-loop optimization control of fuel injection duration.
Therefore, the injection characteristic parameters such as the injection timing, the injection duration and the like obtained by real-time correction calculation are used as closed-loop control quantity of the combustion closed-loop control algorithm, so that the real-time correction of the injection parameters of each cycle and the closed-loop control of the combustion process in the cylinder are realized.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a schematic diagram of an offline testing system for fuel injection rules of a fuel injector to obtain offline injection characteristic parameter information of the fuel injector corresponding to different engine working conditions;
FIG. 2 is a schematic block diagram of an off-line test of injection characteristics of a fuel injector;
FIG. 3 is a schematic diagram of real-time online acquisition of fuel injection characteristics of an engine;
FIG. 4 is a pressure curve of an oil tank of an oil injector, a pressure curve of an oil inlet pipe of the oil injector, a pressure curve of a pressure storage cavity at the head of the oil injector and a lift curve of a needle valve under a certain engine working condition so as to extract parameter characteristic points corresponding to the action of the needle valve;
FIG. 5 is a pressure curve of a fuel tank of the fuel injector, a pressure curve of a fuel inlet pipe of the fuel injector, and a pressure curve of a pressure accumulation cavity at a head of the fuel injector shown in FIG. 4;
FIG. 6 is a partial enlarged view taken at point A in FIG. 5;
FIG. 7 is a pressure curve of an oil tank of an oil injector, a pressure curve of an oil inlet pipe of the oil injector and a pressure curve of a pressure storage cavity at the head of the oil injector under a certain engine working condition to extract an oil injection duration;
FIG. 8 is a comparison of a pressure curve of the head pressure accumulation chamber obtained offline and obtained online in real time; and
FIG. 9 is a flow chart of a combustion closed-loop control method based on injection characteristic parameters of an engine injector according to a preferred embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
The invention provides a combustion closed-loop control method based on oil injection characteristic parameters of an engine oil injector, which specifically comprises the following steps:
acquiring off-line injection characteristic parameter information of the oil injector corresponding to different engine working conditions, and extracting reference parameter characteristic points corresponding to the needle valve action of the oil injector according to each group of off-line injection characteristic parameter information;
in the actual operation process of an engine, acquiring real-time injection characteristic parameter information of an oil injector, and extracting real-time parameter characteristic points corresponding to the action of a needle valve according to the real-time injection characteristic parameter information;
and performing closed-loop optimization control on the real-time injection characteristic parameters according to the comparison result of the real-time parameter characteristic points and the reference parameter characteristic points.
Therefore, high-precision testing and prediction calculation of real-time injection characteristic parameters of each cylinder can be realized, and real-time correction of injection timing and control pulse width is realized through the ECU and the signal post-processing module.
Specifically, for the steps of obtaining off-line injection characteristic parameter information of the fuel injector corresponding to different engine working conditions and extracting reference parameter characteristic points corresponding to the needle valve action of the fuel injector according to each group of off-line injection characteristic parameter information:
referring to fig. 1, an oil injector of an engine is connected to an oil injector oil injection rule offline test system to obtain offline injection characteristic parameter information of the oil injector to be tested. The off-line test system specifically comprises: the fuel injector tester comprises a control center consisting of a driver, a computer and a calibration device, an oscilloscope connected with the driver and a fuel supply part connected with a tested fuel injector. The oil supply part comprises an oil tank, a motor and a common rail pipe, wherein oil in the oil tank is driven by the motor to flow in the common rail pipe so as to be input into the oil injector to be tested. The control center of the off-line test system simulates different working conditions of the generator to send out different control signals. The injection characteristic parameters of the injector during operation (for example, the injection pressure curve) can be shown by an oscilloscope.
More specifically, referring to fig. 2, the testing of the offline injection characteristic parameter information of the injector according to the engine operating condition table may specifically include: timing of oil injection, pulse width of injection, single injection oil quantity, oil injection duration, oil injection rate curve, pressure curve of pressure accumulation cavity at head of oil injector, pressure curve of oil inlet pipe of oil injector, pressure curve of oil containing groove of oil injector, etc. It will be appreciated that a given engine operating condition corresponds to a set of off-line injection characteristic parameter information as described above. The pressure curve of the pressure accumulation cavity at the head part of the oil sprayer, the pressure curve of the oil inlet pipe of the oil sprayer and the pressure curve of the oil containing groove of the oil sprayer can be generated through data collected by the pressure sensors at corresponding positions.
The measured key off-line injection characteristic parameters can form an injector injection characteristic reference database for extracting characteristic points of needle valve opening, needle valve closing and the like. And establishing a mapping relation of key characteristic parameters based on the off-line injection characteristic parameter information and the needle valve action characteristic points, and summarizing to form a signal processing algorithm for calculating real-time on-line injection timing and injection duration. Wherein the calculation of the injection timing may be understood as a calculation of the time at which the injector is opened.
More specifically, extracting the reference parameter feature points corresponding to the needle valve action of the injector according to each group of offline injection characteristic parameter information may include:
and determining the fuel pressure characteristic points of a needle valve opening point, a needle valve descending point and a needle valve seating point on a pressure curve of a fuel tank of the fuel injector.
As shown in fig. 4 and 5, t0 represents the time at which the needle valve starts moving; t1 represents the time when the needle valve reaches the maximum lift; t2 represents the time when the maximum lift of the needle valve starts to fall; t3 represents the time when the needle valve is fully closed. Therefore, the fuel pressure characteristic point of the opening point of the needle valve is a starting point A point at which the pressure on a pressure curve of an oil containing groove of the oil injector begins to greatly decrease; the fuel pressure characteristic point of the needle valve descending point is a pressure wave valley point in the pressure descending stage on the pressure curve of the fuel containing groove of the fuel injector; the fuel pressure characteristic point of the needle valve seating point is a point D of a first pressure wave peak point on a pressure curve of an oil containing groove of the oil sprayer from the moment of power failure of the needle valve.
With continued reference to fig. 4, 5, and 6, extracting the reference parameter feature points corresponding to the needle valve action of the injector according to each set of offline injection characteristic parameter information may also include:
and respectively extracting pressure characteristic points corresponding to the fuel pressure characteristic points on a pressure curve of a fuel inlet pipe of the fuel injector and a pressure curve of a pressure accumulation cavity at the head of the fuel injector by taking the fuel pressure characteristic points corresponding to a needle valve opening point, a needle valve descending point and a needle valve seating point on the pressure curve of a fuel tank of the fuel injector as references.
Specifically, the pressure characteristic points are pressure inflection points which are not changed along with the common rail pressure and the injection pulse width of the oil injector from each fuel pressure characteristic point on a pressure curve of an oil inlet pipe of the oil injector and a pressure curve of a pressure accumulation cavity at the head part of the oil injector.
For convenience of understanding, referring to fig. 5 and 6, a point a on a pressure curve of an oil tank of the oil injector truly reflects the opening time of the needle valve, the point a can be understood as one of the above-mentioned fuel pressure characteristic points, and a time difference between a pressure inflection point of the pressure accumulation cavity and the oil pipe joint and the reference point is calculated by taking the point as a reference, and if the time difference does not change along with the injection pulse width and the common rail pressure, the opening time of the needle valve can be judged through the pressure curve of the pressure accumulation cavity at the head of the oil injector and the pressure curve of the oil pipe joint of the oil. Similarly, pressure characteristic points corresponding to a needle valve descending point and a needle valve seating point (point D) can also be extracted from a pressure curve of an oil injector head pressure accumulation cavity and an oil injector oil inlet pipe joint pressure curve.
The specific reasons are as follows: according to the analysis of the pressure curve of the oil containing groove of the oil sprayer, at the closing time of the needle valve, an obvious pressure inflection point appears on the pressure curve of the oil containing groove of the oil sprayer. The opening duration of the needle valve obtained from the pressure curve of the pressure storage cavity at the head of the oil sprayer and the pressure curve of the oil pipe connection of the oil sprayer is basically consistent with the opening duration of the needle valve obtained from the oil containing groove of the oil sprayer, and the error is basically within 2 percent. The delay of each pressure inflection point at the opening time of the needle valve is basically consistent with the delay time at the closing time of the needle valve. Of course, as shown in fig. 7, the characteristic information of the fuel injection duration may also be extracted according to a pressure curve of a pressure accumulation cavity at the head of the fuel injector and a pressure curve of a pipe joint of the fuel injector.
The specific steps of obtaining the off-line injection characteristic parameter information of the fuel injector corresponding to different engine working conditions and extracting the reference parameter characteristic points corresponding to the needle valve action of the fuel injector according to each group of off-line injection characteristic parameter information are described above. It will be appreciated that the map of the off-line injection characteristic parameter and the reference parameter characteristic point for each engine operating condition may be pre-stored in the ECU of the engine to be recalled.
Next, description is made with reference to fig. 3: and in the actual running process of the engine, acquiring the real-time injection characteristic parameter information of the oil injector, and extracting the real-time parameter characteristic points corresponding to the needle valve action according to the real-time injection characteristic parameter information.
In the running stage of the engine, real-time injection characteristic parameter information such as a pressure curve of a pressure accumulating cavity at the head part of the oil sprayer, injection pulse width, power-on timing of an injection electromagnetic valve and the like can be acquired through real-time communication of a rail pressure sensor (with the test precision of 0.5 percent and the sampling frequency of 1kHz), a pressure wave sensor (with the test precision of 0.3 percent and the sampling frequency of 0-5 kHz) of the pressure accumulating cavity at the head part of the oil sprayer and ECU injection control parameters.
The method comprises the steps of acquiring injection characteristic parameter information of an injector in an engine operation stage, and extracting a parameter characteristic point corresponding to the action of a needle valve; the injection characteristic parameter information obtained in the off-line test process of the fuel injector is defined as off-line injection characteristic parameter information, and the extracted parameter characteristic point corresponding to the needle valve action is defined as a reference parameter characteristic point.
Therefore, it can also be understood that the process of acquiring the real-time injection characteristic parameter information and extracting the real-time parameter feature points in the engine operation stage is similar to that in the off-line test process, and therefore, the detailed description is omitted for brevity of the behavior.
As shown in fig. 8 and 9, after the off-line parameter feature points and the real-time parameter feature points are extracted, the real-time parameter feature points need to be compared with the reference parameter feature points under the corresponding working conditions by using the signal post-processing module, and then the real-time injection characteristic parameters need to be subjected to closed-loop optimization control according to the comparison result.
As shown in fig. 8, the comparing process between the real-time parameter feature point and the reference parameter feature point may be: the method comprises the steps of taking the power-on time of an electromagnetic valve of an oil injector as a signal analysis starting point, comparing a pressure curve of a pressure accumulating cavity of the head of the oil injector measured in real time on line with off-line test data under operation parameters such as corresponding rail pressure and control pulse width, and calculating a pressure characteristic point difference value delta t0 of a pressure characteristic point t0 corresponding to the opening point of a needle valve extracted in real time and a pressure characteristic point difference value delta t3 of a pressure characteristic point t3 corresponding to the seating point of the needle valve extracted in real time and a pressure characteristic point corresponding to the seating point of the needle valve extracted in off-line test. And then calculating the real-time oil injection timing and the oil injection duration according to the real-time oil injection timing and the oil injection duration, and displaying and recording the real-time oil injection timing and the oil injection duration on a computer. And (3) the real-time prediction display of the oil injection rate curve needs to convert the offline oil injection rate data into a response surface model, look-up is carried out through real-time control parameters of the ECU and real-time online pressure storage cavity pressure wave signals, and the offline oil injection rate data under the same input condition is read for real-time display.
Through the real-time online signal comparison analysis of fig. 7, important injection characteristic parameters such as the injection delay value of the pressure characteristic point t0 corresponding to the opening point of the needle valve relative to the power-on time of the solenoid valve and the injection duration value of the time period t3-t0 can be obtained. And (3) taking the injection characteristic parameters such as the injection timing, the injection duration and the like obtained by real-time calculation as closed-loop control quantity of a combustion closed-loop control algorithm, and realizing real-time correction of each-cycle injection parameter and closed-loop control of the in-cylinder combustion process. It is understood that the closed loop optimization control herein includes at least: the method comprises the steps of closed-loop optimization control of fuel injection timing, closed-loop optimization control of injection pulse width and closed-loop optimization control of fuel injection duration.
The flows and steps described in all the preferred embodiments described above are only examples. Unless an adverse effect occurs, various processing operations may be performed in a different order from the order of the above-described flow. The above-mentioned steps of the flow can be added, combined or deleted according to the actual requirement.
Further, the commands, command numbers, and data items described in all the preferred embodiments described above are only examples, and thus the commands, command numbers, and data items may be set in any manner as long as the same functions are achieved. The units of the terminal of the preferred embodiments may also be integrated, further divided or subtracted according to actual needs.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A combustion closed-loop control method based on an injection characteristic parameter of an engine injector is characterized by comprising the following steps:
acquiring off-line injection characteristic parameter information of an oil injector corresponding to different engine working conditions, and extracting reference parameter characteristic points corresponding to the needle valve action of the oil injector according to each group of off-line injection characteristic parameter information;
in the actual operation process of an engine, acquiring real-time injection characteristic parameter information of the oil injector, and extracting real-time parameter characteristic points corresponding to the needle valve action according to the real-time injection characteristic parameter information;
and performing closed-loop optimization control on the real-time injection characteristic parameters according to the comparison result of the real-time parameter characteristic points and the reference parameter characteristic points.
2. The engine fuel injector-based combustion closed-loop control method according to claim 1, characterized in that the mapping relationship between the off-line injection characteristic parameters and the reference parameter characteristic points under each engine operating condition is pre-stored in a control module of the engine to form a database to be called.
3. The closed-loop combustion control method based on injection characteristic parameters of an engine injector according to claim 1, characterized in that said injector injection characteristic parameter information comprises at least: pressure curve of oil tank of oil injector.
4. The combustion closed-loop control method based on the injection characteristic parameters of the engine injector according to claim 3, characterized in that extracting the parameter characteristic points corresponding to the needle valve action of the injector according to the injection characteristic parameter information comprises:
and determining fuel pressure characteristic points of a needle valve opening point, a needle valve descending point and a needle valve seating point on a pressure curve of an oil containing groove of the oil injector.
5. The combustion closed-loop control method based on the injection characteristic parameters of the engine injector according to claim 4, characterized in that the fuel pressure characteristic point of the opening point of the needle valve is a starting point of a pressure start to drop greatly on a pressure curve of an oil containing groove of the injector; the fuel pressure characteristic point of the needle valve descending point is a pressure wave valley point in a pressure descending stage on a pressure curve of an oil containing groove of the oil sprayer; the fuel pressure characteristic point of the needle valve seating point is the first pressure wave peak point on the pressure curve of the oil containing groove of the oil sprayer from the moment of power failure of the needle valve.
6. The closed-loop combustion control method based on injection characteristic parameters of an engine injector according to claim 3, characterized in that said injector injection characteristic parameter information further comprises: the oil inlet pipe of the oil sprayer is connected with a pressure curve and a pressure accumulation cavity pressure curve at the head of the oil sprayer.
7. The combustion closed-loop control method based on the injection characteristic parameters of the engine injector according to claim 6, characterized in that extracting the parameter characteristic points corresponding to the needle valve action of the injector according to the injection characteristic parameter information comprises:
and respectively extracting pressure characteristic points corresponding to the fuel pressure characteristic points on a pressure curve of a fuel inlet pipe of the fuel injector and a pressure curve of a pressure accumulating cavity at the head of the fuel injector by taking the fuel pressure characteristic points corresponding to a needle valve opening point, a needle valve descending point and a needle valve seating point on the pressure curve of a fuel tank of the fuel injector as references.
8. The combustion closed-loop control method based on the injection characteristic parameters of the engine injector according to claim 7, characterized in that the pressure characteristic points are pressure inflection points that are not changed with the common rail pressure and the injection pulse width of the injector from each fuel pressure characteristic point on a pressure curve of a fuel inlet pipe of the injector and a pressure curve of a pressure accumulation cavity of a head portion of the injector.
9. The closed-loop combustion control method based on injection characteristic parameters of an engine injector according to claim 3, characterized in that said injection characteristic parameters further comprise: timing of injection, pulse width of injection, single injection amount of oil, duration of injection, and injection rate profile.
10. The closed-loop combustion control method based on injection characteristic parameters of an engine injector according to claim 1, characterized in that the closed-loop optimal control of the real-time injection characteristic parameters comprises at least: the method comprises the steps of closed-loop optimization control of fuel injection timing, closed-loop optimization control of injection pulse width and closed-loop optimization control of fuel injection duration.
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