CN114635794B - Combustion condition determining method and device, electronic equipment and storage medium - Google Patents
Combustion condition determining method and device, electronic equipment and storage medium Download PDFInfo
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- CN114635794B CN114635794B CN202210214467.0A CN202210214467A CN114635794B CN 114635794 B CN114635794 B CN 114635794B CN 202210214467 A CN202210214467 A CN 202210214467A CN 114635794 B CN114635794 B CN 114635794B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
- F02B77/085—Safety, indicating or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application discloses a combustion condition determining method, a combustion condition determining device, electronic equipment and a storage medium, which are used for accurately determining the combustion condition of an engine. In the embodiment of the application, the crankshaft rotating speed of the engine is acquired periodically; determining the number of sampling points of the exhaust stroke pressure signal according to the acquired crankshaft rotating speed; determining the combustion condition of the engine by comparing the number of sampling points with a first threshold value, and determining the combustion condition of the engine according to the exhaust pressure of the engine corresponding to the sampling points when the number of the sampling points is greater than or equal to the first threshold value; and when the number of the sampling points is smaller than a first threshold value, determining the combustion condition of the engine according to the rotating speed of the crankshaft. The exhaust pressure method is preferred when the combustion condition of the engine is determined, and the crankshaft rotating speed method is adopted when the exhaust pressure method is inaccurate or unavailable, so that the combustion condition of the engine can be determined accurately and detected in real time.
Description
Technical Field
The present disclosure relates to the field of engine technologies, and in particular, to a method and an apparatus for determining a combustion condition, an electronic device, and a storage medium.
Background
In the related art, in a natural gas engine misfire diagnosis strategy, a crankshaft rotation speed method is mostly adopted, but in the method, because the change of the crankshaft angular acceleration is closely related to the rotational inertia of a power assembly connected with a crankshaft and the rear end of the crankshaft, and the larger the rotational inertia is, the smaller the change of the crankshaft angular acceleration is, the combustion condition of the engine cannot be accurately determined when the rotation speed is higher.
Disclosure of Invention
The application aims to provide a combustion condition determining method, a combustion condition determining device, electronic equipment and a storage medium, which are used for accurately determining the combustion condition of an engine.
In a first aspect, an embodiment of the present application provides a combustion condition determining method applied to an Electronic Control Unit (ECU), including:
periodically acquiring the crankshaft rotating speed of the engine;
determining the number of sampling points of the exhaust stroke pressure signal according to the obtained crankshaft rotation speed and a preset sampling point number determination mode;
if the number of the sampling points is larger than or equal to a first threshold value, acquiring the sampling points based on the number of the sampling points, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point;
and if the number of the sampling points is smaller than a first threshold value, determining the combustion condition of the engine based on the crankshaft speed.
According to the method, the number of sampling points is determined based on the crankshaft rotation speed of the engine, when the number of the sampling points is less than the preset number of the sampling points, the collected exhaust pressure of the engine cannot accurately determine the combustion condition of the engine, so that the combustion condition of the engine is determined by adopting the crankshaft rotation speed of the engine, and when the number of the sampling points is greater than or equal to a first threshold value, the exhaust pressure at the moment can accurately reflect the combustion condition of the engine, so that whether the engine catches fire or not can be determined based on the exhaust pressure; the method combines the crankshaft speed and the exhaust pressure of the engine, so that the judgment of the combustion condition of the engine is more accurate.
In some possible embodiments, the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points comprises:
determining a first difference value between the maximum value and the minimum value in the exhaust pressure corresponding to the sampling point;
if the first difference value is smaller than or equal to a second threshold value, determining that the combustion condition of the engine is a misfire;
and if the first difference value is larger than the second threshold value, determining that the combustion condition of the engine is not misfired.
In the application, the second threshold value is determined according to the experience value of a technician, and the combustion condition of the engine is determined according to the difference value between the maximum value and the minimum value in the exhaust pressure, so that the judgment on the engine is more accurate.
In some possible embodiments, after the determining that the combustion condition of the engine is not misfiring, the method further comprises:
if the first difference is greater than or equal to the third threshold, determining that combustion of the engine is sufficient; wherein the third threshold is greater than the second threshold;
and if the first difference is smaller than the third threshold, determining poor combustion of the engine.
In the application, in order to further determine the combustion condition of the engine, a third threshold value is set, and the combustion condition of the engine is determined according to the correlation between the first difference value and the third threshold value, so that the judgment on the combustion condition of the engine is more accurate.
In some possible embodiments, before collecting the sample points based on the number of the sample points, the method further comprises:
determining that at least one exhaust pressure sensor of the engine is not malfunctioning.
According to the method and the device, before sampling, whether the exhaust pressure sensor of the engine fails or not is firstly determined, and sampling is carried out on the premise that the exhaust pressure sensor does not fail, so that the misfire diagnosis efficiency is improved.
In some possible embodiments, before collecting the sample points based on the number of the sample points, the method further comprises:
determining that the load of the engine is greater than a fourth threshold.
In the present application, in the case where the engine load is greater than the fourth threshold value, sampling is performed, which further makes the engine misfire diagnosis more accurate.
In some possible embodiments, the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points comprises:
determining a second difference value between the minimum value and the initial value in the exhaust pressure corresponding to the sampling point, and determining the ratio of the second difference value to the sampling time;
and if the ratio is smaller than a fifth threshold value, determining that the combustion condition of the engine is misfiring.
In the application, the combustion condition of the engine is determined by adopting the variation condition between preset exhaust pressure conditions of the engine, so that the determination of the combustion condition of the engine is more comprehensive.
In some possible embodiments, the predetermined number of sampling points is determined in a manner satisfying the following formula:
n＝k/(N*A)；
wherein: n represents the number of sampling points, N represents the crankshaft speed of the engine, a represents the number of cylinders of the engine, and k represents a calculation constant.
In a second aspect, the present application also provides a misfire diagnostic apparatus applied to an ECU, the apparatus comprising:
the crankshaft rotating speed acquisition module is used for periodically acquiring the crankshaft rotating speed of the engine;
the sampling point number determining module is used for determining the number of sampling points of the exhaust stroke pressure signal according to the acquired crankshaft rotating speed and a preset sampling point number determining mode;
the exhaust pressure diagnosis module is used for collecting sampling points based on the number of the sampling points if the number of the sampling points is greater than or equal to a first threshold value, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point;
and the crankshaft rotating speed diagnosis module is used for determining the combustion condition of the engine based on the crankshaft rotating speed if the number of the sampling points is smaller than a first threshold value.
In some possible embodiments, the exhaust pressure diagnostic module performs the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points, including:
determining a first difference value between the maximum value and the minimum value in the exhaust pressure corresponding to the sampling point;
if the first difference value is smaller than or equal to a second threshold value, determining that the combustion condition of the engine is a misfire;
and if the first difference value is larger than the second threshold value, determining that the combustion condition of the engine is not misfiring.
In some possible embodiments, after the exhaust pressure diagnostic module performs the determining that the combustion condition of the engine is not misfiring, the method further comprises:
if the first difference is greater than or equal to the third threshold, determining that combustion of the engine is sufficient; wherein the third threshold is greater than the second threshold;
and if the first difference is smaller than the third threshold, determining that the combustion of the engine is poor.
In some possible embodiments, before the exhaust pressure diagnostic module performs the sampling based on the number of the sampling points, the exhaust pressure diagnostic module is further configured to:
determining that at least one exhaust pressure sensor of the engine is not malfunctioning.
In some possible embodiments, before the exhaust pressure diagnostic module collects sampling points based on the number of sampling points, the exhaust pressure diagnostic module is further configured to:
determining that the load of the engine is greater than a fourth threshold.
In some possible embodiments, the exhaust pressure diagnostic module performs the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points, including:
determining a second difference value between the minimum value and the initial value in the exhaust pressure corresponding to the sampling point, and determining the ratio of the second difference value to the sampling time;
and if the ratio is smaller than a fifth threshold value, determining the combustion condition of the engine as the misfire.
In some possible embodiments, the predetermined number of sampling points is determined in a manner satisfying the following formula:
n＝k/(N*A)；
wherein: n represents the number of sampling points, N represents the crankshaft speed of the engine, a represents the number of cylinders of the engine, and k represents a calculation constant.
In a third aspect, another embodiment of the present application further provides an electronic device, including at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods provided by the embodiments of the first aspect of the present application.
In a fourth aspect, another embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and the computer program is configured to cause a computer to execute any one of the methods provided in the first aspect of the present application.
Additional features and advantages of the application 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 application. The objectives and other advantages of the application may 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 technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an application scenario diagram of a combustion condition determining method according to an embodiment of the present application;
FIG. 2 is a schematic overall flow chart of a combustion condition determining method provided by an embodiment of the present application;
FIG. 3 is a schematic flow chart illustrating a method for determining whether an exhaust pressure sensor is malfunctioning according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a combustion determination method according to an embodiment of the present disclosure;
fig. 5 is a schematic electronic device diagram of a combustion condition determining method according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application 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. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The inventor researches and discovers that in the related art, in a natural gas engine misfire diagnosis strategy, a method of crankshaft rotation speed is mostly adopted, but in the method, because the change of crankshaft angular acceleration is closely related to the rotational inertia of a power assembly connected with a crankshaft and the rear end of the crankshaft, and the larger the rotational inertia is, the smaller the change of the crankshaft angular acceleration is, the combustion condition of the engine cannot be accurately determined when the rotation speed is higher.
In view of the above, the present application proposes a combustion situation determination method, apparatus, electronic device and storage medium to solve the above problems. The inventive concept of the present application can be summarized as follows: periodically acquiring the crankshaft rotating speed of the engine; determining the number of sampling points of the exhaust stroke pressure signal according to the acquired crankshaft rotating speed; determining the combustion condition of the engine by comparing the number of sampling points with a first threshold value, and determining the combustion condition of the engine according to the exhaust pressure of the engine corresponding to the sampling points when the number of the sampling points is greater than or equal to the first threshold value; and when the number of the sampling points is smaller than a first threshold value, determining the combustion condition of the engine according to the rotating speed of the crankshaft.
For the sake of understanding, a combustion condition determining method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings:
fig. 1 is a view showing an application scenario of the combustion situation determination method in the embodiment of the present application. The figure includes: ECU10, engine, exhaust pressure sensor, memory 20; wherein:
the ECU10 periodically acquires the crankshaft rotation speed of the engine; determining the number of sampling points of the exhaust stroke pressure signal according to the obtained crankshaft rotation speed and a preset number of sampling points stored in the memory 20; if the number of the sampling points is larger than or equal to the first threshold value, controlling an exhaust pressure sensor to collect the sampling points based on the number of the sampling points, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point; and if the number of the sampling points is less than the first threshold value, determining the combustion condition of the engine based on the crankshaft speed.
The description in this application will be detailed in terms of only a single ECU10, engine, exhaust gas pressure sensor, memory 20, but it will be understood by those skilled in the art that the ECU10, engine, exhaust gas pressure sensor, memory 20 shown in fig. 1 are intended to represent the operation of the ECU10, engine, exhaust gas pressure sensor, memory 20 to which the subject matter of this application relates. And is not meant to imply limitations on the number, type, or location of the ECU10, engine, exhaust pressure sensor, memory 20, or the like. It should be noted that the underlying concepts of the example embodiments of the present application may not be altered if additional modules are added or removed from the illustrated environments.
It should be noted that the storage 20 in the embodiment of the present application may be, for example, a cache system, or may also be a hard disk storage, a memory storage, and the like. In addition, the combustion condition determining method provided by the application is not only suitable for the application scene shown in fig. 1, but also suitable for any device with a combustion condition determining requirement.
As shown in fig. 2, an overall flowchart of a combustion condition determining method provided in the embodiment of the present application is shown, in which:
in step 201: periodically acquiring the crankshaft speed of the engine;
in step 202: determining the number of sampling points of the exhaust stroke pressure signal according to the obtained crankshaft rotation speed and a preset sampling point number determination mode;
in step 203: determining whether the number of sampling points is greater than or equal to a first threshold value; if yes, go to step 204, otherwise go to step 205;
in step 204: collecting sampling points based on the number of the sampling points, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point;
in step 205: combustion of the engine is determined based on the crankshaft speed.
In some embodiments, since the exhaust pressure sensor collects the exhaust pressure of the engine according to a fixed period in the exhaust pressure-based combustion condition determination method, the higher the crankshaft speed of the engine is, the fewer exhaust pressure sampling points are sampled in each cycle, which may further cause a risk of erroneous determination when determining the combustion condition. When determining the combustion condition based on the crankshaft rotation speed of the engine, the acquired crankshaft rotation speed may be inaccurate under a small load, and further, when determining the combustion condition, the combustion condition of the engine may not be accurately determined.
Therefore, in the present application, in order to realize accurate combustion condition determination for the engine, the combustion condition determination for the engine is performed in combination with the exhaust pressure method and the crankshaft rotation speed method.
In the method, the crankshaft rotating speed of the engine needs to be acquired periodically, and the number of sampling points of the exhaust stroke pressure signal needs to be determined according to the acquired crankshaft rotating speed and a preset number of sampling points. In specific implementation, the period for acquiring the crankshaft rotation speed of the engine can be set by a technician, and certainly, the crankshaft rotation speed of the engine can also be acquired in real time, which is not limited in the present application.
In some embodiments, the predetermined number of sampling points is determined by the formula satisfying formula 1:
wherein: n represents the number of sampling points, N represents the crankshaft speed of the engine, a represents the number of cylinders of the engine, and k represents a calculation constant.
For example: the engine is a 6-cylinder engine, and A is 6; if the engine is an 8-cylinder engine, a is 8.
When the formula 1 is adopted, firstly, the crankshaft rotation speed of the engine is obtained, the unit of the crankshaft rotation speed is N revolutions per minute, one working cycle of the engine is 2 circles, if the number of cylinders of the engine is a, the time for one circle is T minutes, wherein T =2/N, k is a calculation constant for converting minutes into milliseconds, and therefore, the number N of sampling points is = (T × 60 × 1000)/a.
For ease of understanding, the following description will be made of the determination of engine combustion using the crankshaft speed method and the exhaust pressure method, respectively:
1. exhaust pressure method
In the specific implementation, compared with a crankshaft rotation speed method, the exhaust pressure method has the following advantages:
1) The method is free from external interference, the fluctuation of the crankshaft rotating speed signal is easily influenced by the rear rotational inertia of the crankshaft of the engine, and the inertia is large if the rotational inertia is large, so that the change of the crankshaft rotating speed is weakened and the influence of the load of the engine is obvious; secondly, the crankshaft rotation speed method is greatly influenced by road conditions when the combustion condition of the engine is determined, and the rotation speed of the crankshaft can fluctuate when the combustion condition of the engine is normal due to a bumpy road surface.
2) The device is suitable for both small-displacement engines with small rotational inertia and heavy engines with large rotational inertia, has strong universality, can accurately determine the combustion condition of the engine, protects the three-way catalyst, and can ensure the accuracy of monitoring the combustion condition.
Based on the advantages, the exhaust pressure method is preferred when the combustion condition of the engine is determined, and the crankshaft rotating speed method is adopted when the exhaust pressure method is inaccurate or unavailable, so that the combustion condition of the engine can be determined accurately and simultaneously can be detected in real time.
Therefore, when selecting the combustion condition determination method of the engine, it is necessary to first determine whether the current condition can be determined by using an exhaust pressure method, and when determining the combustion condition by using the exhaust pressure method, the following two conditions need to be satisfied:
(1) Determining that at least one exhaust pressure sensor of the engine is not malfunctioning.
In a specific implementation, two exhaust pressure sensors are respectively arranged on the left side and the right side of the engine, and the exhaust pressure sensors on the two sides can be used for collecting exhaust stroke pressure signals, so that before the combustion condition is determined by adopting an exhaust pressure method, the steps shown in fig. 3 need to be executed:
in step 301: determining whether an exhaust pressure sensor at the current side of the engine fails, if not, entering step 302, otherwise, entering step 303;
in step 302: collecting sampling points by adopting a current side exhaust pressure sensor;
in step 303: determining whether an exhaust pressure sensor on the opposite side of the engine fails, if not, entering step 304, otherwise, entering step 305;
in step 304: sampling points are collected by adopting an opposite side exhaust pressure sensor;
in step 305: and determining the combustion condition of the engine by adopting a crankshaft rotation speed method.
By the method shown in fig. 3, it can be determined whether the exhaust pressure method is available in the present situation, and the exhaust pressure method is first used when the exhaust pressure method is available.
(2) Determining whether the number of sampling points is greater than or equal to a first threshold value
When the combustion condition of the engine is determined by adopting an exhaust pressure method, the number of sampling points is required to be ensured to be larger than a first threshold value, if the number of the sampling points is smaller than the threshold value, points which can represent the combustion condition of the engine can be possibly acquired, and the determined combustion condition of the engine is inaccurate, so that the number of the sampling points can be determined by adopting the formula 1, and when the number of the sampling points is larger than or equal to the first threshold value, the combustion condition of the engine can be determined by adopting the exhaust pressure method.
(3) Engine load greater than fourth threshold
In some embodiments, the load of the engine may affect the exhaust pressure of the engine, and when the load is large, the exhaust pressure of the engine may change greatly, so that when the load is small, the exhaust pressure may change slightly, and the combustion condition of the engine cannot be accurately determined according to the exhaust pressure. Therefore, before determining the combustion condition of the engine by using the exhaust pressure method, it is necessary to ensure that the load of the engine is greater than the fourth threshold value.
In the present application, when determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point, the following two methods may be implemented:
the method comprises the following steps:
when the engine is in normal combustion, the exhaust pressure is required to fluctuate within a preset range, so that the combustion condition of the engine can be determined according to the difference value of the exhaust pressure of the engine, and a first difference value between the maximum value and the minimum value in the exhaust pressure corresponding to the sampling point is determined firstly; if the first difference is smaller than or equal to the second threshold value, determining that the combustion condition of the engine is misfiring; and if the first difference value is larger than the second threshold value, determining that the combustion condition of the engine is not misfired.
In some embodiments, where the combustion condition of the engine is not misfiring, there may be a possibility of poor combustion, and in order to identify this condition, a third threshold value is provided, and the combustion condition of the engine may be further determined based on the condition between the first difference value and the third threshold value when it is determined that the engine is not misfiring, that is:
if the first difference is greater than or equal to the third threshold, determining that the combustion of the engine is sufficient; and if the first difference is smaller than the third threshold value, determining that the combustion of the engine is poor.
When the combustion of the engine is determined to be poor, a prompt alarm can be sent out to inform a driver to process the situation.
In some embodiments, to further ensure the accuracy of the first difference, the following method may be used to determine the maximum value of the exhaust pressure:
firstly, determining a pressure value P corresponding to a sampling point and a previous sampling point P of the sampling point 0 And determining the ratio of the difference to the time length t between the sampling point and the previous sampling point as K = (P-P) 0 ) If the ratio is greater than 0, taking the maximum value of the pressure values acquired in the sampling duration as the maximum value of the exhaust pressure corresponding to the sampling point; if the ratio is smaller than 0, the pressure value corresponding to the sampling point is taken as the maximum value in the exhaust pressure corresponding to the sampling point.
For example: the time interval between every two sampling points is collected to be t, the sampling points are A, B, C in sequence, the pressure value of the sampling point B is P1, the pressure value of the sampling point A is P2, and the ratio is K = (P1-P2)/t.
The method 2 comprises the following steps:
when the engine is in normal combustion, the exhaust pressure is fluctuated within a preset range, so that the combustion condition of the engine can be determined according to the slope between sampling points, a second difference value between the minimum value and the initial value in the exhaust pressure corresponding to the sampling points is determined at first, and the ratio of the second difference value to the sampling time is determined; if the ratio is less than the fifth threshold, the combustion condition of the engine is determined to be misfiring.
It should be understood that the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold mentioned above are all empirical values determined by a skilled person according to experiments, and in a specific implementation, the skilled person may make appropriate adjustments according to actual situations, which is not limited in this application.
In the present application, method 1 and method 2 are two parallel embodiments, and the skilled person can select them according to the needs, and can also combine the two methods, which is not limited in the present application.
2. Crankshaft rotation speed method
In the present application, when the combustion condition of the engine cannot be determined or cannot be accurately determined by the exhaust pressure method, in order to detect the combustion condition of the engine in real time, in this case, it is necessary to determine the combustion condition of the engine by the crankshaft rotation speed method.
During specific implementation, the crankshaft rotating speed of the engine can be obtained, the acceleration of the crankshaft rotating speed is determined according to the crankshaft rotating speed sensor, and if the acceleration of the crankshaft rotating speed is smaller than a preset value, the combustion condition of the engine can be determined to be a misfire.
In conclusion, in the application, an exhaust pressure method is preferred when the combustion condition of the engine is determined, and a crankshaft rotating speed method is adopted when the exhaust pressure method is inaccurate or unavailable, so that the combustion condition of the engine can be determined accurately and simultaneously detected in real time.
As shown in fig. 4, based on the same inventive concept, there is provided a combustion condition determining apparatus applied to an ECU, the apparatus including:
the crankshaft rotating speed acquisition module is used for periodically acquiring the crankshaft rotating speed of the engine;
the number of sampling points determining module is used for determining the number of the sampling points of the exhaust stroke pressure signal according to the obtained crankshaft rotating speed and a preset number of the sampling points determining mode;
the exhaust pressure diagnosis module is used for collecting sampling points based on the number of the sampling points if the number of the sampling points is larger than or equal to a first threshold value, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point;
and the crankshaft rotating speed diagnosis module is used for determining the combustion condition of the engine based on the crankshaft rotating speed if the number of the sampling points is smaller than a first threshold value.
In some possible embodiments, the exhaust pressure diagnostic module performs the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points, including:
determining a first difference value between the maximum value and the minimum value in the exhaust pressure corresponding to the sampling point;
if the first difference is larger than a second threshold value, determining that the combustion condition of the engine is a misfire;
and if the first difference value is smaller than or equal to the second threshold value, determining that the combustion condition of the engine is not misfiring.
In some possible embodiments, after the exhaust pressure diagnostic module performs the determining that the combustion condition of the engine is not misfiring, the method further comprises:
if the first difference is greater than or equal to the third threshold, determining that combustion of the engine is sufficient; wherein the third threshold is greater than the second threshold;
and if the first difference is smaller than the third threshold, determining that the combustion of the engine is poor.
In some possible embodiments, before the exhaust pressure diagnostic module performs the sampling based on the number of the sampling points, the exhaust pressure diagnostic module is further configured to:
determining that at least one exhaust pressure sensor of the engine is not malfunctioning.
In some possible embodiments, before collecting the sampling points based on the number of sampling points, the exhaust pressure diagnostic module is further configured to:
determining that the load of the engine is greater than a fourth threshold.
In some possible embodiments, the exhaust pressure diagnostic module performs the determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each of the sampling points, including:
determining a second difference value between the minimum value and the initial value in the exhaust pressure corresponding to the sampling point, and determining the ratio of the second difference value to the sampling time;
and if the ratio is smaller than a fifth threshold value, determining the combustion condition of the engine as the misfire.
In some possible embodiments, the predetermined number of sampling points is determined in a manner that satisfies the following formula:
n＝k/(N*A)；
wherein: n represents the number of sampling points, N represents the crankshaft speed of the engine, a represents the cylinder parameter of the engine, and k represents a calculation constant.
Having described the combustion condition determining method and apparatus according to the exemplary embodiments of the present application, next, an electronic device according to another exemplary embodiment of the present application will be described.
As will be appreciated by one skilled in the art, aspects of the present application may be embodied as a system, method or program product. Accordingly, various aspects of the present application may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
In some possible embodiments, an electronic device according to the present application may include at least one processor, and at least one memory. Wherein the memory stores program code which, when executed by the processor, causes the processor to perform the steps of the combustion event determination method according to various exemplary embodiments of the present application described above in the present specification.
An electronic device according to this embodiment of the present application is described below with reference to fig. 5. The electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 5, the electronic device is represented in the form of a general electronic device. Components of the electronic device may include, but are not limited to: the at least one processor, the at least one memory, and a bus connecting the various system components (including the memory and the processor).
A bus represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor, or a local bus using any of a variety of bus architectures.
The memory may include readable media in the form of volatile memory, such as Random Access Memory (RAM) and/or cache memory, and may further include Read Only Memory (ROM).
The memory may also include a program/utility having a set (at least one) of program modules including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device may also communicate with one or more external devices (e.g., keyboard, pointing device, etc.), with one or more devices that enable a user to interact with the electronic device, and/or with any device (e.g., router, modem, etc.) that enables the electronic device to communicate with one or more other electronic devices. Such communication may be through an input/output (I/O) interface. Also, the electronic device may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via a network adapter. As shown, the network adapter communicates with other modules for the electronic device over a bus. It should be understood that although not shown in FIG. 5, other hardware and/or software modules may be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
In some possible embodiments, aspects of a combustion situation determining method provided herein may also be embodied in the form of a program product including program code for causing a computer device to perform the steps of a combustion situation determining method according to various exemplary embodiments of the present application described above in this specification, when the program product is run on the computer device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The program product for combustion event determination of embodiments of the present application may employ a portable compact disk read only memory (CD-ROM) and include program code, and may be run on an electronic device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the consumer electronic device, partly on the consumer electronic device, as a stand-alone software package, partly on the consumer electronic device and partly on a remote electronic device, or entirely on the remote electronic device or server. In the case of remote electronic devices, the remote electronic devices may be connected to the consumer electronic device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external electronic device (e.g., through the internet using an internet service provider).
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
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 combustion condition determining method applied to an electronic control unit ECU, the method comprising:
periodically acquiring the crankshaft speed of the engine;
determining the number of sampling points of the exhaust stroke pressure signal according to the obtained crankshaft rotation speed and a preset sampling point number determination mode;
if the number of the sampling points is larger than or equal to a first threshold value, acquiring the sampling points based on the number of the sampling points, and determining the combustion condition of the engine based on the exhaust pressure of the engine corresponding to each sampling point;
and if the number of the sampling points is smaller than a first threshold value, determining the combustion condition of the engine based on the crankshaft speed.
2. The method of claim 1, wherein said determining a combustion condition of said engine based on an exhaust pressure of said engine corresponding to each of said sampling points comprises:
determining a first difference value between the maximum value and the minimum value in the exhaust pressure corresponding to the sampling point;
if the first difference value is smaller than or equal to a second threshold value, determining that the combustion condition of the engine is a misfire;
and if the first difference value is larger than the second threshold value, determining that the combustion condition of the engine is not misfiring.
3. The method of claim 2, wherein after the determining that the combustion condition of the engine is an unfired, the method further comprises:
if the first difference is larger than or equal to a third threshold, determining that the combustion of the engine is sufficient; wherein the third threshold is greater than the second threshold;
and if the first difference is smaller than the third threshold, determining that the combustion of the engine is poor.
4. The method of claim 1, wherein prior to collecting samples based on the number of samples, the method further comprises:
determining that at least one exhaust pressure sensor of the engine is not malfunctioning.
5. The method of claim 1, wherein prior to collecting the sample points based on the number of sample points, the method further comprises:
determining that the load of the engine is greater than a fourth threshold.
6. The method of claim 1, wherein said determining combustion of said engine based on said engine exhaust pressure corresponding to each said sampling point comprises:
determining a second difference value between the minimum value and the initial value in the exhaust pressure corresponding to the sampling point, and determining the ratio of the second difference value to the sampling time;
and if the ratio is smaller than a fifth threshold value, determining the combustion condition of the engine as the misfire.
7. The method according to claim 1, wherein the predetermined number of sampling points is determined in a manner satisfying the following formula:
wherein: n represents the number of sampling points, N represents the crankshaft speed of the engine, a represents the number of cylinders of the engine, and k represents a calculation constant.
8. A combustion condition determining apparatus, applied to an ECU, the apparatus comprising:
the crankshaft rotating speed acquisition module is used for periodically acquiring the crankshaft rotating speed of the engine;
the sampling point number determining module is used for determining the number of sampling points of the exhaust stroke pressure signal according to the acquired crankshaft rotating speed and a preset sampling point number determining mode;
the exhaust pressure diagnosis module is used for collecting sampling points based on the number of the sampling points if the number of the sampling points is larger than or equal to a first threshold value, and is based on the combustion condition of the engine corresponding to each sampling point;
and the crankshaft rotating speed diagnosis module is used for determining the combustion condition of the engine based on the crankshaft rotating speed if the number of the sampling points is less than a first threshold value.
9. An electronic device comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to implement the method of any one of claims 1 to 7.
10. A computer storage medium, characterized in that the computer storage medium stores a computer program for enabling a computer to perform the method according to any one of claims 1-7.
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