CN110657038A - Oil injection control method of diesel engine - Google Patents
Oil injection control method of diesel engine Download PDFInfo
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- CN110657038A CN110657038A CN201910913137.9A CN201910913137A CN110657038A CN 110657038 A CN110657038 A CN 110657038A CN 201910913137 A CN201910913137 A CN 201910913137A CN 110657038 A CN110657038 A CN 110657038A
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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
- F02D41/3005—Details not otherwise provided for
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0618—Actual fuel injection timing or delay, e.g. determined from fuel pressure drop
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- General Engineering & Computer Science (AREA)
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses an oil injection control method of a diesel engine, which comprises the following steps: after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not; if not, judging whether the conditions that the injection release condition is met and the oil injector has no fault are met or not when the diesel engine is synchronous; if yes, calculating an oil injection advance angle in real time, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, finding a working condition point according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity interpolation value of the diesel engine, converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value. The method of the invention realizes that the calculation of the time interval between the oil injection position and the current effective edge is converted into the accumulation of the crankshaft tooth period, and the influence of the rotation speed fluctuation and the acceleration/deceleration on the oil injection position is eliminated.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an oil injection control method of a diesel engine.
Background
The fuel injection position has great significance for the operation of the diesel engine, and meanwhile, the noise, the emission and the fuel economy can be greatly influenced, so that the significance for ensuring that the engine works at the accurate fuel injection position is great. A crankshaft position sensor may be used to determine the position of the crankshaft, i.e., the rotational angle of the crankshaft, which may also be used to detect engine speed, and is therefore also referred to as a speed sensor. When the crankshaft position sensor fails, the rotational speed and engine phase information can be obtained from the collected camshaft position sensor signals. For a diesel engine with an "n + 1" type camshaft fluted disc (n represents the number of uniform teeth on the camshaft fluted disc, and 1 represents synchronous teeth), after the phase of the engine is determined, if a crankshaft signal is lost or interfered, an angle clock cannot be generated by the crankshaft signal, and angle information cannot be acquired by the crankshaft signal, wherein the calculation method of the oil injection position comprises the following steps:
the accumulated speed of the angle clock in the next segment is predicted according to the previous segment period (the crankshaft segment angle is obtained by dividing the whole working cycle by equal angles, the segment period represents the time for the crankshaft to rotate by the segment angle), because the angle interval between the effective edge (hereinafter referred to as the effective edge) of the uniform teeth of the current camshaft signal and the TDC (compression top dead center) of the corresponding cylinder is fixed, the oil injection advance angle is an angle relative to the TDC, the difference between the two angles can calculate the angle interval between the oil injection advance angle and the current effective edge, and then the angle interval is proportionally converted into the time interval according to the segment period.
The method comprises the steps of collecting a six-cylinder machine (60-2 type crankshaft fluted disc (58 physical teeth and 2 teeth lack), a 6+1 type camshaft fluted disc, wherein 2 circles of crankshaft rotation are one working cycle, and 1 circle of camshaft rotation is performed every working cycle), starting from the rotating speed of 0 to the tooth period of about 700rpm at the low idle speed, wherein the corresponding rotating speeds are shown in figure 1. The segment period at steady rotational speed, i.e., the sum of 20 crankshaft tooth periods corresponding to 120 ° ca rotation of the crankshaft, has been substantially stabilized, as shown in fig. 2.
However, when 2 adjacent segments under the low-idle-speed stable condition are captured, the tooth periods of 20 crankshaft teeth included in the segment are not equal, as shown in fig. 3, the peak of the curve is the maximum point of the tooth period, which indicates that the engine phase reaches the compression top dead center of the current cylinder, and the valley of the curve is the minimum point of the tooth period, which indicates that the diesel oil in the cylinder is combusted to work to generate acceleration.
The precondition that the angle interval is converted into the time interval in the prior art is that the crankshaft does uniform motion between segment angles, and the angle clocks are accumulated at a uniform speed, however, even under a stable working condition, the rotating speed of the diesel engine is fluctuated, and the fluctuation period is the same as the period of doing work of the cylinder of the diesel engine: when the cylinder does work, the crankshaft does acceleration movement, and when the cylinder does not do work, the crankshaft does deceleration movement. The oil injection position calculated under the single camshaft mode by using the prior art scheme can generate deviation with the actual position, the deviation is related to factors such as the current engine rotating speed, the oil injection advance angle, the oil injection quantity and the like, and the larger the acceleration/deceleration of the engine generated by combustion work is, the larger the deviation is.
Disclosure of Invention
The invention aims to provide an oil injection control method of a diesel engine. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of an embodiment of the present invention, there is provided a fuel injection control method of a diesel engine, including:
after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not;
if the signal of the crankshaft position sensor is abnormal, judging whether the conditions of injection release are met and the condition that the oil injector has no fault is met or not when the diesel engine is synchronous; if yes, calculating an oil injection advance angle in real time, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, finding a working condition point according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity interpolation value of the diesel engine, converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value.
Further, the method further comprises:
if the signals of the crankshaft position sensor are normal, after the diesel engine is synchronously finished, judging whether two conditions of meeting the injection release condition and having no fault of an oil injector are simultaneously met; if yes, one fuel injection operation is executed.
Further, the method further comprises: dividing the whole driving cycle into a plurality of working condition points according to the current rotation speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, and recording the data of each tooth period in a complete crankshaft segment at each working condition point.
Further, the method further comprises: the data for each tooth cycle is stored after the diesel engine is shut down.
Further, the method further comprises: and if the two conditions of meeting the injection release condition and having no fault of the oil injector are not simultaneously met, judging whether the diesel engine is stopped, and if not, turning to the step of judging whether the two conditions of meeting the injection release condition and having no fault of the oil injector are simultaneously met.
Further, the formula for converting the angle interval into the accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working point is as follows:
where phiInj represents the advance angle of fuel injection, mod represents the operation of taking the remainder, tnRepresenting the tooth period, n ∈ {1,2, …, [ phiInj/6 }]}。
Further, the method further comprises: if the injection release condition is met and the condition that the oil injector has no fault is not met, judging whether the diesel engine is stopped; and if the engine is not stopped, turning to the condition whether the conditions for judging whether the injection release conditions are met and the oil injector has no fault are met.
Further, the method further comprises: if the crankshaft position sensor signal is not normal, the process of the method is ended when the diesel engine is out of synchronization.
According to another aspect of the embodiments of the present invention, there is provided an electronic device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the fuel injection control method of the diesel engine.
According to another aspect of the embodiments of the present invention, there is provided a non-transitory computer-readable storage medium having stored thereon a computer program, which is executed by a processor, to implement the fuel injection control method of a diesel engine.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following beneficial effects:
the fuel injection control method of the diesel engine provided by the embodiment of the invention is characterized in that the fuel injection advance angle is calculated in real time based on the conditions of the rotating speed, the circulating fuel supply quantity and the like of the diesel engine, the angle interval between the fuel injection position and the current camshaft signal effective edge is calculated according to the fuel injection advance angle, the working condition point is found through interpolation according to the rotating speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, the angle interval is converted into the accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working condition point, and one fuel injection operation is executed according to the accumulated value, so that the calculation of the time interval between the fuel injection position and the current effective edge is converted into the accumulation of the crankshaft tooth periods, and the influence of rotating speed fluctuation and acceleration/deceleration on the fuel injection position is.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a corresponding rotation speed curve diagram of a prior art six-cylinder engine during starting; the abscissa represents time in seconds; the ordinate represents the rotation speed in rpm;
FIG. 2 is a graph of segment period corresponding to the start of a prior art six-cylinder engine; the abscissa represents time in seconds; the ordinate represents the cycle count value;
FIG. 3 is a graph of segment internal tooth cycle count values corresponding to the start of a prior art six-cylinder engine; the abscissa represents time in seconds; the ordinate represents the tooth period count value;
FIG. 4 is a flowchart illustrating a method for controlling fuel injection in a diesel engine according to an embodiment of the present disclosure;
FIG. 5 is a graph of the tooth cycle change of an embodiment of the present application; the abscissa represents time in seconds; the ordinate represents the tooth period count value;
FIG. 6 is a graph comparing the effect of one embodiment of the present application with the prior art; the abscissa represents time in seconds; the ordinate represents the time interval T divided by the value of the actual segment period.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including 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. 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 prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 4, an embodiment of the present application provides a fuel injection control method for a diesel engine, including:
s1, starting the diesel engine;
s2, judging whether the signal of the crank sensor is normal or not; if normal, go to S3; otherwise, go to S4;
s3, completing the synchronization of the diesel engine, and turning to S9;
s4, judging whether the diesel engine is synchronous or not; if yes, go to S5; otherwise, go to S8;
s5, judging whether the injection release condition is met and the oil injector has no fault; if yes, go to S6; otherwise, go to S8;
s6, calculating an oil injection advance angle in real time based on conditions such as the rotating speed and the circulating oil supply quantity of the diesel engine, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, interpolating according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity of the diesel engine to find a working condition point, and converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point;
s7, executing one fuel injection operation according to the accumulated value;
s8, judging whether the engine is stopped; if yes, go to S14; otherwise, go to S5;
s9, judging whether the injection release condition is met and the oil injector has no fault; if yes, go to S10; otherwise, go to S12;
s10, executing a fuel injection operation;
s11, dividing the whole driving cycle into a plurality of working condition points according to the current engine speed, the fuel injection advance angle and the fuel injection quantity, and recording each tooth period data in a complete crankshaft segment at each working condition point;
s12, judging whether the engine is stopped; if yes, go to S13; otherwise, go to S9;
s13, storing the data of each tooth period into a nonvolatile storage area;
and S14, ending.
Another embodiment of the present application provides a fuel injection control method of a diesel engine, including:
after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not;
if the signal of the crankshaft position sensor is abnormal, judging whether the conditions of injection release are met and the condition that the oil injector has no fault is met or not when the diesel engine is synchronous; if the working condition is met, calculating an oil injection advance angle in real time based on conditions such as the rotating speed and the circulating oil supply quantity of the diesel engine, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, interpolating according to three factors including the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity of the diesel engine to find a working condition point, converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value.
In some embodiments, the fuel injection control method of a diesel engine further includes:
if the signals of the crankshaft position sensor are normal, after the diesel engine is synchronously finished, judging whether two conditions of meeting the injection release condition and having no fault of an oil injector are simultaneously met; if yes, one fuel injection operation is executed.
In some embodiments, the fuel injection control method of a diesel engine further includes: dividing the whole driving cycle into a plurality of working condition points according to the current rotation speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, and recording the data of each tooth period in a complete crankshaft segment at each working condition point.
In some embodiments, the fuel injection control method of a diesel engine further includes: the data for each tooth cycle is stored after the diesel engine is shut down. After the data for each tooth cycle are stored, they can be recalled at any time later.
In some embodiments, the fuel injection control method of a diesel engine further includes: and if the two conditions of meeting the injection release condition and having no fault of the oil injector are not simultaneously met, judging whether the diesel engine is stopped, and if not, turning to the step of judging whether the two conditions of meeting the injection release condition and having no fault of the oil injector are simultaneously met.
Further, the formula for converting the angle interval into the accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working point is as follows:
where phiInj represents the advance angle of fuel injection, mod represents the operation of taking the remainder, tnRepresenting the tooth period, n ∈ {1,2, …, [ phiInj/6 }]}。
In some embodiments, the fuel injection control method of a diesel engine further includes: if the injection release condition is met and the condition that the oil injector has no fault is not met, judging whether the diesel engine is stopped; and if the engine is not stopped, turning to the condition whether the conditions for judging whether the injection release conditions are met and the oil injector has no fault are met.
In some embodiments, the fuel injection control method of a diesel engine further includes: if the crankshaft position sensor signal is not normal, the process of the method is ended when the diesel engine is out of synchronization.
The embodiment also provides electronic equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the fuel injection control method of the diesel engine.
The present embodiment also provides a non-transitory computer-readable storage medium having stored thereon a computer program which is executed by a processor to implement the fuel injection control method of a diesel engine.
Another embodiment of the present application provides a fuel injection control method of a diesel engine, including:
s10, after the diesel engine is started, an Electronic Control Unit (ECU) judges whether a signal of a crankshaft position sensor is normal;
s20, if the signal of the crank position sensor is normal, after the diesel engine is synchronized, the injection release condition is satisfied and the injector is fault-free, the primary injection operation is executed, then the whole driving cycle is divided into a plurality of working points according to the information data of the current engine speed, the injection advance angle and the injection quantity, and each tooth period t in a complete crank segment at each working point is recordedn(n: 1-20) data, storing the data in a nonvolatile storage area after the engine is stopped; wherein the segment represents a tooth period of a uniform tooth of the camshaft; the satisfaction of the injection release condition may include receiving a signal to increase engine power from an operator that controls engine power (thrust force);
s30, if the signal of the crank shaft position sensor is abnormal, entering a single camshaft mode;
an Electronic Control Unit (ECU) acquires current rotating speed data of the engine according to a camshaft signal acquired by a camshaft position sensor;
when the diesel engine is synchronous, the injection release condition is met, and the oil injector has no fault, the oil injection advance angle is calculated in real time based on the conditions of the rotating speed, the circulating oil supply quantity and the like of the diesel engine, the angle interval between the oil injection position and the current camshaft signal effective edge is calculated according to the oil injection advance angle, the working condition point is found through interpolation according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity of the diesel engine, the angle interval is converted into the accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working condition point, and then one-time oil injection operation is executed.
In some embodiments, in a mode that signals of a crankshaft position sensor and a camshaft position sensor are normal, after synchronization of a diesel engine is completed, fuel injection operation is executed when an injection release condition is met and a fuel injector is not in fault, the whole driving cycle is divided into a plurality of working condition points according to 3 factors of the current engine speed, the fuel injection advance angle and the fuel injection quantity, and each tooth period t in a complete crankshaft segment at each working condition point is recordedn(n: 1-20), and storing the data;
when the signals of the crankshaft position sensor are unavailable (for example, the signals are lost or interference exists), a single camshaft mode is entered, corresponding working condition points are searched in an interpolation mode according to the current engine speed, the fuel injection advance angle and the fuel injection quantity, and the angle interval is converted into the accumulated value T of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working condition points:
wherein mod represents a remainder taking operation; (phiInj mod 6) namely taking the remainder of the division of the injection advance angle phiInj by 6;
the tooth cycle profile is shown in fig. 5 when the engine is accelerated from 200rpm to around 600 rpm. Fig. 5 contains 160 teeth, corresponding to 8 segments. Assume that the angle of the set injection position relative to the current active edge is 1/2 segment angle, i.e. the angular separation of the injection position from the current active edge is 60 ° ca, which is also the angle corresponding to 10 teeth of crankshaft rotation.
Using the prior art, the time interval between the oil injection position and the current effective edge is 1/2 of the last segment period; by using the technical scheme of the embodiment, after the injection parameters are calculated, the corresponding working condition points are searched, and the first 10 of 20 crankshaft tooth cycles corresponding to the working condition points are added and summed to be used as the time interval between the oil injection position and the current effective edge. The position of the injection angle in the current segment is expressed as the calculated time interval divided by the actual segment period. The result obtained with the solution of the present embodiment is substantially about 0.5, i.e. 1/2 position of segment angle, whereas the result obtained with the prior art is significantly more biased and the injection position lags during acceleration, as shown in fig. 6. Therefore, the technical scheme of the embodiment can obviously improve the accuracy of the oil injection position in the single camshaft mode and improve the power and emission performance of the engine.
The fuel injection control method of the diesel engine provided by the embodiment of the invention is characterized in that the fuel injection advance angle is calculated in real time based on the conditions of the rotating speed, the circulating fuel supply quantity and the like of the diesel engine, the angle interval between the fuel injection position and the current camshaft signal effective edge is calculated according to the fuel injection advance angle, the working condition point is found through interpolation according to the rotating speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, the angle interval is converted into the accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the working condition point, and one fuel injection operation is executed according to the accumulated value, so that the calculation of the time interval between the fuel injection position and the current effective edge is converted into the accumulation of the crankshaft tooth periods, and the influence of rotating speed fluctuation and acceleration/deceleration on the fuel injection position is.
It should be noted that:
the term "module" is not intended to be limited to a particular physical form. Depending on the particular application, a module may be implemented as hardware, firmware, software, and/or combinations thereof. Furthermore, different modules may share common components or even be implemented by the same component. There may or may not be clear boundaries between the various modules.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the creation apparatus of a virtual machine according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fuel injection control method of a diesel engine, characterized by comprising:
after the diesel engine is started, judging whether a signal of a crankshaft position sensor is normal or not;
if the signal of the crankshaft position sensor is abnormal, judging whether the conditions of injection release are met and the condition that the oil injector has no fault is met or not when the diesel engine is synchronous; if yes, calculating an oil injection advance angle in real time, calculating an angle interval between an oil injection position and the current camshaft signal effective edge according to the oil injection advance angle, finding a working condition point according to the rotating speed of the diesel engine, the oil injection advance angle and the oil injection quantity interpolation value of the diesel engine, converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to a crankshaft tooth period array corresponding to the working condition point, and executing one-time oil injection operation according to the accumulated value.
2. The method of claim 1, further comprising:
if the signals of the crankshaft position sensor are normal, after the diesel engine is synchronously finished, judging whether two conditions of meeting the injection release condition and having no fault of an oil injector are simultaneously met; if yes, one fuel injection operation is executed.
3. The method of claim 2, further comprising: dividing the whole driving cycle into a plurality of working condition points according to the current rotation speed, the fuel injection advance angle and the fuel injection quantity of the diesel engine, and recording the data of each tooth period in a complete crankshaft segment at each working condition point.
4. The method of claim 3, further comprising: the data for each tooth cycle is stored after the diesel engine is shut down.
5. The method of claim 2, further comprising: and if the two conditions of meeting the injection release condition and having no fault of the oil injector are not simultaneously met, judging whether the diesel engine is stopped, and if not, turning to the step of judging whether the two conditions of meeting the injection release condition and having no fault of the oil injector are simultaneously met.
6. The method according to claim 1, wherein the formula for converting the angle interval into an accumulated value of a plurality of crankshaft tooth periods according to the crankshaft tooth period array corresponding to the operating point is as follows:
where phiInj represents the advance angle of fuel injection, mod represents the operation of taking the remainder, tnRepresenting the tooth period, n ∈ {1,2, …, [ phiInj/6 }]}。
7. The method of claim 1, further comprising: if the injection release condition is met and the condition that the oil injector has no fault is not met, judging whether the diesel engine is stopped; and if the engine is not stopped, turning to the condition whether the conditions for judging whether the injection release conditions are met and the oil injector has no fault are met.
8. The method of claim 1, further comprising: if the crankshaft position sensor signal is not normal, the process of the method is ended when the diesel engine is out of synchronization.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of any one of claims 1-8.
10. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor to implement the method according to any one of claims 1-8.
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