CN114720138A - Calibration method, device and equipment for pre-spraying opening angle and storage medium - Google Patents
Calibration method, device and equipment for pre-spraying opening angle and storage medium Download PDFInfo
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Abstract
The application relates to the technical field of engine calibration, in particular to a calibration method, a calibration device, calibration equipment and a storage medium for a pre-spraying opening angle. The method is used for reasonably setting the pre-spraying opening angle of the engine and improving the low-temperature starting performance of the engine, and comprises the following steps: when the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not less than the rail pressure threshold value, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, and determining the crank shaft corner instantaneous value acquired by the crank shaft sensor to be in a preset crank shaft corner interval and the crank shaft corner instantaneous value at the moment to be a pre-spraying opening angle calibration value corresponding to the starting mode when the crank shaft corner instantaneous value is determined to be in the preset crank shaft corner interval and the in-cylinder working medium temperature instantaneous value reaches the working medium temperature threshold value; therefore, the temperature of the working medium in the cylinder can be raised by utilizing the heat released by the cold flame reaction, so that the fuel oil can quickly reach the fuel oil spontaneous combustion temperature to automatically catch fire and burn, the starting time of the engine is shortened, and the low-temperature starting performance of the engine is improved.
Description
Technical Field
The present disclosure relates to the field of engine calibration technologies, and in particular, to a calibration method, device, and apparatus for a pre-spray opening angle, and a storage medium.
Background
The low-temperature starting capability of the engine is an important index for evaluating the performance of the engine. However, the pre-injection opening angle of the conventional engine is usually formulated by adopting empirical data, but in a limit low-temperature environment, after fuel is injected into a cylinder by the pre-injection opening angle formulated based on the empirical data, because the temperature of the wall surface of the cylinder of the engine is very low, the expected effect of heating the fuel to form a mixed gas cannot be obtained, and even the starting time of the engine can be prolonged, so that the pre-injection opening angle of the engine is reasonably set, and the method has important significance for improving the low-temperature starting capability of the engine.
Disclosure of Invention
The embodiment of the application provides a calibration method, device and equipment of a pre-spraying opening angle and a storage medium, which are used for reasonably setting the pre-spraying opening angle of an engine and improving the low-temperature starting capability of the engine.
The embodiment of the application provides the following specific technical scheme:
in a first aspect, an embodiment of the present application provides a calibration method for a pre-spraying opening angle, including:
after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not smaller than a rail pressure threshold value, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, wherein the rail pressure instantaneous value is a fuel pressure instantaneous value in a fuel common rail pipe acquired by the rail pressure sensor;
when the fact that the temperature instantaneous value of the working medium in the cylinder reaches the working medium temperature threshold value is determined, whether the crank angle instantaneous value acquired through the crank shaft sensor is located in a preset crank angle interval or not is judged, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value;
and if the crank angle instantaneous value is determined to be located in the preset crank angle interval, determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode.
According to the method, the pre-spraying opening angle calibration value corresponding to the accurate starting mode can be obtained, and therefore pre-spraying is carried out based on the pre-spraying opening angle calibration value, cold flame reaction in the cylinder can be accurately triggered, so that the temperature of working media in the cylinder is raised by heat emitted by the cold flame reaction, fuel oil is heated, evaporation atomization of the fuel oil is improved, formation of mixed gas in the cylinder is accelerated, spontaneous combustion temperature of the fuel oil is reached, self-ignition combustion is carried out, starting time of the engine is greatly shortened, low-temperature starting performance of the engine is greatly improved, the engine can be stably started in a limit low-temperature environment, and pollution emission and the like are reduced.
Optionally, after determining that the operating mode of the engine is the start mode, before determining whether the crank angle instantaneous value collected by the crank sensor is within a preset crank angle interval, the method further includes:
and determining that the engine establishes signal synchronization based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, wherein the signal synchronization indicates that a piston in a cylinder of the engine is positioned at the top dead center of a compression stroke.
According to the method, the signal synchronization of the engine is determined through the cam signal and the crankshaft signal, so that the measured crank angle instantaneous value can be ensured to be the same as the position of a piston in an engine cylinder, the crank angle instantaneous value corresponding to an accurate working medium temperature threshold can be obtained, and the purposes of shortening the starting time of the engine and improving the low-temperature starting performance of the engine are achieved.
Optionally, the operating mode of the engine is determined to be a start mode by performing the steps of:
continuously reading the value of the starting success status bit of the engine;
if the numerical values read twice adjacently are changed from a first state value to a second state value, or the numerical values read twice adjacently are the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold of the engine; the engine speed is acquired by an engine speed sensor.
According to the method, the reasonable pre-spraying opening angle corresponding to the starting mode is accurately acquired by determining the current running mode of the engine as the starting mode.
Optionally, the obtaining of the corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor includes:
according to a first thermodynamic law, based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, obtaining the internal energy increment in a cylinder;
and according to a second law of thermodynamics, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the in-cylinder internal energy increment.
According to the method, the corresponding in-cylinder working medium temperature instantaneous value is obtained through calculation based on the cylinder pressure instantaneous value through the law of thermodynamics, so that when the in-cylinder working medium temperature instantaneous value is subsequently determined to reach a working medium temperature threshold value (namely, the initial working medium temperature in which the cold flame reaction occurs in the cylinder), the crank angle instantaneous value corresponding to the initial working medium temperature in which the cold flame reaction occurs in the cylinder can be accurately obtained, the crank angle instantaneous value is accurately determined to be the pre-spraying opening angle calibration value corresponding to the starting mode, the starting time of the engine is further shortened, and the low-temperature starting performance of the engine is improved.
Optionally, the working medium temperature threshold is an initial working medium temperature at which a cold flame reaction occurs in a cylinder of the engine.
According to the method, the initial working medium temperature of the cold flame reaction in the cylinder is determined as the calibration value of the pre-spraying opening angle corresponding to the starting mode, and the cold flame reaction can be utilized to the maximum extent to increase the working medium temperature in the cylinder so as to improve the low-temperature starting performance of the engine.
In a second aspect, an embodiment of the present application provides a calibration apparatus for a pre-spraying opening angle, including:
the obtaining module is used for obtaining a corresponding in-cylinder working medium temperature instantaneous value based on a cylinder pressure instantaneous value acquired by a cylinder pressure sensor after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not less than a rail pressure threshold value, wherein the rail pressure instantaneous value is a fuel pressure instantaneous value in a fuel common rail pipe acquired by the rail pressure sensor;
the judging module is used for judging whether the crank angle instantaneous value acquired by the crank sensor is positioned in a preset crank angle interval or not when the working medium temperature instantaneous value in the cylinder reaches the working medium temperature threshold value is determined, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value;
and the determining module is used for determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode if the crank angle instantaneous value is determined to be within the preset crank angle interval.
Optionally, after determining that the operation mode of the engine is the start mode, before determining whether the instantaneous value of the crank angle acquired by the crank sensor is within a preset crank angle interval, the obtaining module is further configured to:
and determining that the engine establishes signal synchronization based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, wherein the signal synchronization indicates that a piston in a cylinder of the engine is positioned at the top dead center of a compression stroke.
Optionally, the operating mode of the engine is determined to be a start mode by performing the steps of:
continuously reading the value of the starting success status bit of the engine;
if the numerical values read twice adjacently are changed from a first state value to a second state value, or the numerical values read twice adjacently are the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold of the engine; the engine speed is collected by an engine speed sensor.
Optionally, the corresponding in-cylinder working medium temperature instantaneous value is obtained based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, and the obtaining module is configured to:
according to a first thermodynamic law, based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, obtaining the internal energy increment in a cylinder;
and according to a second law of thermodynamics, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the in-cylinder internal energy increment.
Optionally, the working medium temperature threshold is an initial working medium temperature at which a cold flame reaction occurs in a cylinder of the engine.
In a third aspect, an embodiment of the present application provides an electronic device, including:
a memory for storing computer programs or instructions;
a processor for executing the computer program or instructions in the memory such that the method according to any of the above first aspects is performed.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, on which computer program instructions are stored, which, when executed by a processor, implement the steps of the method according to any one of the first aspect described above.
In addition, for technical effects brought by any one implementation manner of the second aspect to the fourth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect, and details are not described here.
Drawings
FIG. 1 is a schematic diagram of an in-cylinder ignition process of an engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a temperature interval of working media in a cylinder corresponding to a cold flame reaction in an embodiment of the present application;
FIG. 3 is a schematic diagram of a system architecture of a calibration system for a pre-spray opening angle according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a variation curve of a temperature of a working medium in a cylinder and a crank angle in an embodiment of the present application;
FIG. 5 is a schematic flow chart illustrating a method for calibrating a pre-spray opening angle according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of an electrical control logic of a calibration method for a pre-spray opening angle in an embodiment of the present application;
FIG. 7 is a schematic diagram illustrating a logic structure of a calibration apparatus for a pre-spray opening angle according to an embodiment of the present application;
fig. 8 is a schematic physical architecture diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," "third," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
In the prior art, a pre-spray opening angle calibration value in an engine starting mode is generally established based on empirical data. Specifically, a plurality of pre-spray opening angles are set, the engine starting time corresponding to each pre-spray opening angle is obtained through tests, and the pre-spray opening angle with the relatively short engine starting time is made to be the pre-spray opening angle calibration value in the engine starting mode. In practical application, the calibration value of the pre-spraying opening angle obtained by adopting the traditional calibration mode still has the problems of unstable starting process, long low-temperature starting time and bad discharge in a limit low-temperature environment.
In order to solve the above problems in the prior art, in the embodiment of the present application, after it is determined that the operation mode of the engine is the start mode and the rail pressure instantaneous value is not less than the rail pressure threshold, the corresponding in-cylinder working medium temperature instantaneous value is obtained based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, and when it is determined that the crank angle instantaneous value acquired by the crank shaft sensor is located in the preset crank angle interval and the in-cylinder working medium temperature instantaneous value reaches the working medium temperature threshold, the crank angle instantaneous value at this time is determined as the pre-spraying start angle calibration value corresponding to the start mode, wherein the rail pressure instantaneous value is the fuel pressure value in the fuel common rail pipe acquired by the rail pressure sensor; like this, can obtain the corresponding preliminary ejection opening angle calibration value of accurate start mode, carry out preliminary ejection based on this preliminary ejection opening angle calibration value, can trigger the in-cylinder accurately and take place the cold flame reaction to utilize the heat that the cold flame reaction was given off to promote the in-cylinder working medium temperature, so that the fuel reaches the fuel spontaneous combustion temperature fast and the burning of catching fire by oneself, and then shorten the start-up time of engine by a wide margin, promote the low temperature startability of engine by a wide margin.
In the following, preferred embodiments of the present application will be described in further detail with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are merely for purposes of illustration and explanation of the present application and are not intended to limit the present application, and that the features of the embodiments and examples of the present application may be combined with one another without conflict.
In practical application, when the engine is started in a low-temperature environment, fuel oil cannot be heated to form a mixed gas because the temperature of a working medium in a cylinder of the engine is very low, so that the temperature of the working medium in the cylinder needs to be increased in order to improve the starting performance of the engine in the low-temperature environment.
Fig. 1 shows a schematic diagram of an in-cylinder ignition process of an engine. Referring to fig. 1, ignition of fuel in a cylinder of an engine typically requires three reactions: the method comprises the following steps of cold flame reaction, blue flame reaction and hot flame reaction, wherein the cold flame reaction is a slight exothermic reaction, the generated heat is helpful for heating fuel oil and improving the evaporation atomization of the fuel oil, so that the blue flame reaction is triggered, the blue flame reaction can generate higher temperature rise and pressure rise and induce the mixed gas in a cylinder to perform the hot flame reaction, and the whole process of ignition in the cylinder is completed.
Taking an engine as an example of a diesel engine, research shows that a flame front reaction, namely a cold flame reaction, is formed in the compression process of an engine combustion chamber, the heat released by the cold flame reaction is generally not more than 15% of the total heat release of hydrocarbon, the temperature rise amplitude in the cylinder is about 30-50 ℃, and therefore, in the embodiment of the application, the cold flame reaction can be generated in each compression stroke cycle of the engine by adopting a fuel oil pre-spraying mode, so that the fuel oil is heated by using the heat released by the cold flame reaction, the evaporation and atomization of the fuel oil are improved, the ignition in the cylinder is accelerated, the low-temperature starting time of the engine is shortened, and the low-temperature starting performance of the engine is improved.
Referring to fig. 2, still taking the diesel engine as an example, the heat released by the cold flame reaction is completely dependent on the temperature of the working medium in the cylinder, and the cold flame reaction only occurs in a specific temperature range of the working medium in the cylinder. If the pilot injection is too early, the pressure and temperature in the cylinder are relatively lowered, and the fuel tends to adhere to the cylinder wall, resulting in an extended period of stagnation, which is disadvantageous for improvement of combustion. On the contrary, if spout too late in advance, very easily lead to the time of cold flame effect to be short partially, can not reach the due effect of cold flame for the in-cylinder temperature is on the low side, and it is all unfavorable to the promotion of low temperature startability to spout the opening too early or late in advance, consequently, in the embodiment of this application, will spout the opening angle calibration value in advance and set up to the minimum temperature (like 300 ℃) of cold flame reaction, can make full use of cold flame reaction exothermic heat, the heating fuel improves the evaporation atomization rate of fuel, thereby improves engine low temperature startability.
It should be noted that, in the embodiment of the present application, the scheme is not limited to a diesel engine, and may also be an engine using other compression ignition fuel oil as fuel, which is not described herein again, where the compression ignition fuel oil is a fuel that can ignite by itself after being compressed.
For example, referring to fig. 3, the engine is a diesel engine.
In the embodiment of the present application, a calibration system for a pre-spray opening angle is provided, the system includes an Electronic Control Unit (ECU), a cylinder pressure sensor, and a crankshaft sensor, wherein,
the cylinder pressure sensor is used for acquiring a cylinder pressure instantaneous value of the engine;
the crankshaft sensor is used for acquiring a crank angle instantaneous value of the engine;
the ECU is used for obtaining the temperature instantaneous value of the working medium in the corresponding cylinder based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor after the operation mode of the engine is determined to be a starting mode, the signal synchronization of the engine is established, and the rail pressure instantaneous value acquired by the rail pressure sensor is not less than the rail pressure threshold value; and the device is also used for determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode if the fact that the in-cylinder working medium temperature instantaneous value reaches the working medium temperature threshold value and the crank angle instantaneous value is located in a preset crank angle interval is determined, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than the set threshold value.
Optionally, in this embodiment of the application, the calibration system for the pre-spray opening angle may further include a combustion analyzer, which is configured to obtain a corresponding in-cylinder working medium temperature instantaneous value based on a cylinder pressure instantaneous value of the engine collected in real time by a cylinder pressure sensor, send the cylinder pressure instantaneous value collected in real time and the corresponding in-cylinder working medium temperature instantaneous value to the ECU through a CAN bus, so that the ECU determines that an operation mode of the engine is a start mode, and establishes signal synchronization for the engine, and after the rail pressure instantaneous value collected by the rail pressure sensor is not less than a rail pressure threshold, determine that the in-cylinder working medium temperature instantaneous value reaches the working medium temperature threshold and the crank angle value is within a preset crank angle interval, and determine the crank angle instantaneous value as the calibration value for the pre-spray opening angle corresponding to the start mode.
In specific implementation, one path of signals of a cylinder pressure sensor and a crankshaft sensor of an engine are respectively led out to a combustion analyzer, so that the combustion analyzer can obtain a cylinder pressure instantaneous value and a crankshaft instantaneous value of the engine in real time, obtain a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value collected in real time, and send the collected cylinder pressure instantaneous value and the corresponding in-cylinder working medium temperature instantaneous value to an ECU (electronic control unit) in real time.
Optionally, in the embodiment of the present application, after the instantaneous value of the cylinder pressure and the instantaneous value of the crankshaft are obtained in real time by the combustion analyzer, a variation curve (as shown in fig. 4) between the temperature of the working medium in the cylinder and the angle of the crankshaft may also be obtained, so as to be conveniently used in the subsequent deep research on the engine of the type.
Referring to fig. 5, a specific flow of a method for calibrating a pre-spray opening angle provided in the embodiment of the present application is as follows:
step 500: and after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not less than the rail pressure threshold value, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, wherein the rail pressure instantaneous value is the fuel pressure instantaneous value in the fuel common rail pipe acquired by the rail pressure sensor.
In the embodiment of the present application, before step 500 is executed, the operation mode of the engine is determined to be the start mode by performing the following operations:
and operation one, continuously reading the value of the starting success status bit of the engine.
Secondly, if the numerical values read in two adjacent times are changed from the first state value to the second state value, or the numerical values read in two adjacent times are both the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold value of the engine; the engine speed is collected by an engine speed sensor.
In the embodiment of the application, a start-up success status bit is usually arranged in the engine, and when the ECU acquires that the engine speed exceeds the engine speed threshold value through the engine speed sensor, the start-up success status bit jumps to a second status value from a first status value, so that after the ECU acquires the cylinder pressure instantaneous value, the ECU can judge whether the current operation mode is the start-up mode by reading the value of the start-up success status bit.
In the embodiment of the present application, after determining that the operation mode of the engine is the start mode, before performing step 510, it is further determined that signal synchronization is established for the engine based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, so as to accurately determine the position of the piston in the cylinder of the engine, and thus the obtained calibration value of the pre-spraying opening angle is more accurate, where the signal synchronization indicates that the piston in the cylinder of the engine is located at the top dead center of the compression stroke.
In the embodiment of the present application, when step 500 is executed, the in-cylinder working medium temperature instantaneous value corresponding to the cylinder pressure instantaneous value acquired by the cylinder pressure sensor is obtained by specifically executing the following operations:
and operating the first step, and obtaining the internal energy increment in the cylinder based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor according to the first law of thermodynamics.
And secondly, according to a second law of thermodynamics, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the in-cylinder internal energy increment.
Step 510: and when the instantaneous value of the working medium temperature in the cylinder reaches the working medium temperature threshold value, judging whether the crank angle instantaneous value acquired by the crank shaft sensor is positioned in a preset crank angle interval, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value.
In the embodiment of the application, the working medium temperature threshold is an initial working medium temperature at which a cold flame reaction occurs in a cylinder of the engine, and the preset crank angle interval represents that the operation stroke of a piston in the cylinder of the engine is from the beginning of an intake stroke to the end of a compression stroke.
Step 520: and if the crank angle instantaneous value is determined to be within the preset crank angle interval, determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode.
In the embodiment of the application, by the calibration method of the pre-spraying opening angle, the calibration value of the pre-spraying opening angle corresponding to the starting mode can be determined according to different engine rotating speeds, and is not repeated herein.
Referring to fig. 6, in the embodiment of the present application, an electric control logic diagram of a calibration method of a pre-spraying opening angle includes the following specific logic:
comparing a rail pressure instantaneous value acquired by a rail pressure sensor with a rail pressure threshold value under a first condition, and if the rail pressure instantaneous value is determined to be not less than the rail pressure threshold value based on a comparison result, outputting to be 1, otherwise, outputting to be 0;
judging whether the engine establishes signal synchronization or not based on the cam signal acquired by the cam signal sensor and the crankshaft signal acquired by the crankshaft signal sensor, wherein if the engine establishes signal synchronization, the output is 1, otherwise, the output is 0;
determining the running mode of the engine, judging whether the running mode of the engine is a starting mode, if the running mode of the engine is determined to be the starting mode, outputting 1, otherwise, outputting 0;
a fourth condition, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, comparing the in-cylinder working medium temperature instantaneous value with a working medium temperature threshold value, and if determining that the in-cylinder working medium temperature instantaneous value is equal to the working medium temperature threshold value based on the comparison result, outputting 1, otherwise, outputting 0;
judging whether the crank angle instantaneous value is within a preset crank angle interval or not based on the crank angle instantaneous value acquired by the crank sensor, wherein if the crank angle instantaneous value is determined to be within the preset crank angle interval, the output is 1, otherwise, the output is 0;
performing AND processing on the condition I and the condition II to obtain a first result, wherein if the output of the condition I and the output of the condition II are both 1, the output of the first result is 1, otherwise, the output of the first result is 0;
performing AND processing on the first result and the condition three to obtain a second result, wherein if the output of the first result and the output of the condition three are both 1, the output of the second result is 1, otherwise, the output of the second result is 0;
performing AND processing on the condition four and the condition five to obtain a third result, wherein if the output of the condition four and the output of the condition five are both 1, the output of the third result is 1, otherwise, the output of the third result is 0;
and finally, performing AND processing on the second result and the third result again to obtain a fourth result, wherein if the output of the second result and the output of the third result are both 1, the output of the fourth result is 1, and otherwise, the output of the fourth result is 0.
In the embodiment of the present application, when the output of the fourth result is 1, the crank angle instantaneous value collected at this time is determined as the calibration value of the pre-spraying opening angle of the starting mode, wherein,
the working medium temperature threshold is the initial working medium temperature of the cold flame reaction in the cylinder of the engine, for example, the lowest cold flame temperature 300 ℃ corresponding to the diesel engine;
the predetermined crank angle interval represents the operating stroke of the in-cylinder piston of the engine from the beginning of the intake stroke to the end of the compression stroke, e.g., the corresponding predetermined crank angle interval of the diesel engine is [ a, B ], where a is the beginning of the intake stroke per cycle (noted as-360 ° CA) and B is the end of the compression stroke per cycle (noted as 0 ° CA).
Based on the same inventive concept, referring to fig. 7, an embodiment of the present application provides a calibration apparatus for a pre-spraying opening angle, including:
the obtaining module is used for obtaining a corresponding in-cylinder working medium temperature instantaneous value based on a cylinder pressure instantaneous value acquired by a cylinder pressure sensor after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not less than a rail pressure threshold value, wherein the rail pressure instantaneous value is a fuel pressure instantaneous value in a fuel common rail pipe acquired by the rail pressure sensor;
the judging module is used for judging whether the crank angle instantaneous value acquired by the crank sensor is positioned in a preset crank angle interval or not when the working medium temperature instantaneous value in the cylinder reaches the working medium temperature threshold value is determined, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value;
and the determining module is used for determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode if the crank angle instantaneous value is determined to be within the preset crank angle interval.
Optionally, after determining that the operation mode of the engine is the start mode, before determining whether the instantaneous value of the crank angle acquired by the crank sensor is within a preset crank angle interval, the obtaining module is further configured to:
and determining that the engine establishes signal synchronization based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, wherein the signal synchronization indicates that a piston in a cylinder of the engine is positioned at the top dead center of a compression stroke.
Optionally, the operating mode of the engine is determined to be a start mode by performing the steps of:
continuously reading the value of the starting success status bit of the engine;
if the numerical values read twice adjacently are changed from a first state value to a second state value, or the numerical values read twice adjacently are the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold of the engine; the engine speed is collected by an engine speed sensor.
Optionally, the corresponding in-cylinder working medium temperature instantaneous value is obtained based on the cylinder pressure instantaneous value acquired by the cylinder pressure sensor, and the obtaining module is configured to:
according to a first thermodynamic law, based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, obtaining the internal energy increment in a cylinder;
and according to a second law of thermodynamics, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the in-cylinder internal energy increment.
Optionally, the working medium temperature threshold is an initial working medium temperature at which a cold flame reaction occurs in a cylinder of the engine.
Referring to fig. 8, an embodiment of the present application provides an electronic device, including:
a memory for storing a computer program or instructions;
a processor for executing the computer program or the instructions in the memory, so as to execute any one of the methods executed by the calibration device for the pre-spraying opening angle in the above embodiments.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium, on which computer program instructions are stored, and the computer program instructions, when executed by a processor, implement the steps of any one of the methods performed by the calibration apparatus for a pre-spray opening angle in the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A calibration method of a pre-spraying opening angle is characterized by comprising the following steps:
after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not smaller than a rail pressure threshold value, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, wherein the rail pressure instantaneous value is a fuel pressure instantaneous value in a fuel common rail pipe acquired by the rail pressure sensor;
when the fact that the temperature instantaneous value of the working medium in the cylinder reaches the working medium temperature threshold value is determined, whether the crank angle instantaneous value acquired through the crank shaft sensor is located in a preset crank angle interval or not is judged, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value;
and if the crank angle instantaneous value is determined to be located in the preset crank angle interval, determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode.
2. The method according to claim 1, wherein after said determining that the operation mode of the engine is the start mode, before said determining whether the crank angle instantaneous value collected by the crank sensor is within a preset crank angle interval, further comprises:
and determining that the engine establishes signal synchronization based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, wherein the signal synchronization indicates that a piston in a cylinder of the engine is positioned at the top dead center of a compression stroke.
3. The method of claim 1, wherein the operating mode of the engine is determined to be a start mode by performing the steps of:
continuously reading the value of the starting success status bit of the engine;
if the numerical values read twice adjacently are changed from a first state value to a second state value, or the numerical values read twice adjacently are the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold value of the engine; the engine speed is collected by an engine speed sensor.
4. The method according to claim 1, wherein obtaining the corresponding instantaneous value of the temperature of the working fluid in the cylinder based on the instantaneous value of the cylinder pressure acquired by the cylinder pressure sensor comprises:
according to a first thermodynamic law, based on the cylinder pressure instantaneous value acquired by a cylinder pressure sensor, obtaining the internal energy increment in a cylinder;
and according to a second law of thermodynamics, obtaining a corresponding in-cylinder working medium temperature instantaneous value based on the in-cylinder internal energy increment.
5. The method according to any one of claims 1 to 4, characterized in that the working medium temperature threshold is an initial working medium temperature at which a cold flame reaction occurs in a cylinder of the engine.
6. A calibration device for a pre-spraying opening angle is characterized by comprising:
the obtaining module is used for obtaining a corresponding in-cylinder working medium temperature instantaneous value based on a cylinder pressure instantaneous value acquired by a cylinder pressure sensor after the operation mode of the engine is determined to be a starting mode and the rail pressure instantaneous value is not less than a rail pressure threshold value, wherein the rail pressure instantaneous value is a fuel pressure instantaneous value in a fuel common rail pipe acquired by the rail pressure sensor;
the judging module is used for judging whether the crank angle instantaneous value acquired by the crank sensor is positioned in a preset crank angle interval or not when the working medium temperature instantaneous value in the cylinder reaches the working medium temperature threshold value is determined, wherein the time difference between the acquisition time of the crank angle instantaneous value and the acquisition time of the cylinder pressure instantaneous value is smaller than a set threshold value;
and the determining module is used for determining the crank angle instantaneous value as a pre-spraying opening angle calibration value corresponding to the starting mode if the crank angle instantaneous value is determined to be within the preset crank angle interval.
7. The apparatus of claim 6, wherein after said determining that the operating mode of the engine is the start mode, said deriving module is further configured to, before said determining whether the crank angle instantaneous value collected by the crank sensor is within a preset crank angle interval:
and determining that the engine establishes signal synchronization based on the cam signal collected by the cam signal sensor and the crankshaft signal collected by the crankshaft signal sensor, wherein the signal synchronization indicates that a piston in a cylinder of the engine is positioned at the top dead center of a compression stroke.
8. The apparatus of claim 6, wherein the operating mode of the engine is determined to be a start mode by performing the steps of:
continuously reading the value of the starting success status bit of the engine;
if the numerical values read twice adjacently are changed from a first state value to a second state value, or the numerical values read twice adjacently are the second state values, determining that the running mode of the engine is a starting mode, wherein the second state value is jumped from the first state value when the rotating speed of the engine is determined to exceed the rotating speed threshold of the engine; the engine speed is collected by an engine speed sensor.
9. An electronic device, comprising:
a memory for storing computer programs or instructions;
a processor for executing the computer program or instructions in the memory such that the method of any of claims 1-5 is performed.
10. A computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the method of any one of claims 1-5.
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