CN111779572A - Fire diagnosis method, device, equipment and storage medium - Google Patents
Fire diagnosis method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a fire diagnosis method, a fire diagnosis device, fire diagnosis equipment and a fire diagnosis storage medium. The method comprises the following steps: acquiring the subsection time of an engine ignition cylinder and the running mode of the engine; adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode; determining the state parameters of an engine ignition cylinder according to the target segment time; determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine; and carrying out misfire diagnosis according to the state parameters and the misfire judgment threshold value, and realizing the improvement of the misfire diagnosis accuracy of the large-displacement multi-cylinder engine with a stable cylinder closing working mode by the technical scheme of the invention.
Description
Technical Field
The embodiment of the invention relates to vehicle technology, in particular to a fire diagnosis method, device, equipment and storage medium.
Background
The engine misfire diagnosis is a function of completing online diagnosis and reporting error prompt when a large amount of unburned hydrocarbon exhaust gas is generated due to abnormal combustion in an engine cylinder. The fire, which affects the emissions and even damages the catalyst, is an item that emission regulations mandate detection.
With the gradual development of the internal combustion engine technology and the increasing strictness of emission regulations, the multi-cylinder engine, especially the high-emission multi-cylinder engine, adopts the cylinder closing technology under the specific low-load working condition to play the roles of saving oil and reducing emission. The closed-cylinder working state is a common working mode of a multi-cylinder engine, and the misfire diagnosis is required to be continuously carried out according to the requirements of the regulations. If the cylinder closing state is not distinguished, the misfire diagnosis method under the full-cylinder working state is still completely used, and the misfire diagnosis accuracy of the normal working cylinder is influenced because part of the cylinders are in the cylinder closing state, so that misdiagnosis or missed diagnosis is high.
Disclosure of Invention
The embodiment of the invention provides a misfire diagnosis method, device, equipment and storage medium, which can improve the misfire diagnosis accuracy of a large-displacement multi-cylinder engine with a stable closed-cylinder working mode.
In a first aspect, an embodiment of the present invention provides a misfire diagnostic method, including:
acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode;
determining the state parameters of an engine ignition cylinder according to the target segment time;
determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
In a second aspect, an embodiment of the present invention also provides a misfire diagnostic apparatus, including:
the acquisition module is used for acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
the adjusting module is used for adjusting the subsection time of the engine ignition cylinder to be target subsection time according to the engine running mode;
the first determination module is used for determining the state parameter of the engine ignition cylinder according to the target subsection time;
the second determination module is used for determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and the diagnosis module is used for performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
In a third aspect, embodiments of the present invention further provide a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the processor implements the misfire diagnosis method according to any one of the embodiments of the present invention.
In a fourth aspect, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the misfire diagnostic method as recited in any one of the embodiments of the present invention.
The method comprises the steps of acquiring the subsection time of an engine ignition cylinder and the running mode of the engine; adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode; determining the state parameters of an engine ignition cylinder according to the target segment time; determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine; and performing misfire diagnosis according to the state parameters and the misfire judgment threshold value so as to improve the misfire diagnosis accuracy of the large-displacement multi-cylinder engine with the stable cylinder closing working mode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a misfire diagnostic method in a first embodiment of the invention;
FIG. 1a is a schematic diagram of a crankshaft segment time measurement in accordance with a first embodiment of the present invention;
FIG. 1b is a block diagram of a misfire diagnostic method based on engine operating modes in accordance with a first embodiment of the present invention;
FIG. 1c is a schematic diagram of the staged time preprocessing in different cylinder-closing operation modes according to the first embodiment of the present invention;
fig. 2 is a schematic structural view of a misfire diagnostic apparatus in a second embodiment of the invention;
fig. 3 is a schematic structural diagram of a computer device in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example one
Fig. 1 is a flowchart of a misfire diagnosis method according to an embodiment of the present invention, where the embodiment is applicable to a misfire diagnosis situation, and the method may be executed by a misfire diagnosis apparatus according to an embodiment of the present invention, where the apparatus may be implemented in a software and/or hardware manner, as shown in fig. 1, the method specifically includes the following steps:
and S110, acquiring the subsection time of the engine ignition cylinder and the running mode of the engine.
The segment time refers to the time required for the crankshaft to rotate through a crankshaft segment interval of a certain cylinder, and the crankshaft segment interval is similar to the crank angle sustained by the power stroke of each cylinder.
Wherein the engine ignition cylinder comprises at least one, and the mode of obtaining the engine ignition cylinder can be measured by a crankshaft position sensor.
Wherein the operating modes of the engine include: full cylinder operation, even cylinder closing operation and odd cylinder closing operation. The even cylinder closing operation refers to sequencing the engine ignition cylinders according to the ignition sequence of the engine ignition cylinders, and closing the even cylinders in the sequencing, namely closing the cylinders on the Bank2 side. The operation of closing the odd cylinders refers to sequencing the engine ignition cylinders according to the ignition sequence of the engine ignition cylinders, and closing the odd cylinders in the sequence, namely closing the cylinders on the Bank1 side.
Specifically, the segment time of the ignition cylinder of the engine and the operation mode of the engine are obtained, for example, the segment interval Seg1 of the crankshaft of the cylinder, which is approximate to the power stroke of the 1 st ignition cylinder, is obtained and is approximately equal to TDC1-TDC2, and the segment time t 1; the cylinder crankshaft segment Seg2 approximate to the power stroke of the 2 nd ignition cylinder is approximately equal to TDC2-TDC3, the segment time t2, … …, the cylinder crankshaft segment Seg (n-1) approximate to the power stroke of the n-1 th ignition cylinder is approximately equal to TDC (n-1) -TDCn, the segment time t (n-1), the cylinder crankshaft segment Seg (n) approximate to the power stroke of the n th ignition cylinder is approximately equal to TDCn-TDC1, the segment time tn and the operation mode of the engine.
And S120, adjusting the subsection time of the engine ignition cylinder to be target subsection time according to the engine running mode.
Specifically, adjusting the staging time of the engine ignition cylinder to the target staging time according to the engine operating mode includes: if the engine operation mode is full-cylinder operation, the subsection time of an engine ignition cylinder is unchanged; if the engine operation mode is the operation of closing even cylinders, adjusting the subsection time of odd ignition cylinders of the engine to be target subsection time, wherein the target subsection time is equal to the sum of the subsection time of the current ignition cylinder and the subsection time of the next closed even cylinder; and if the engine operation mode is the operation of closing the odd cylinders, adjusting the subsection time of the even ignition cylinders of the engine to be target subsection time, wherein the target subsection time is equal to the sum of the subsection time of the current ignition cylinder and the subsection time of the next closed odd cylinder.
And S130, determining the state parameters of the ignition cylinder of the engine according to the target subsection time.
Specifically, the target segment time corresponding to each ignition cylinder is input into the misfire diagnostic algorithm to obtain the state parameters of the corresponding ignition cylinder, for example, there are many misfire diagnostic algorithms based on the segment time, and the segment time of a plurality of time points is used for operation output according to the difference of the algorithms. This general algorithm is not the core innovation of the present invention, and in theory any misfire diagnostic algorithm can be applied here, represented here as a function: f (T (i), T (i-1), … …, T (i-n)); where n is the number of engine cylinders, T (i) is the latest staging time, T (i-1) is the staging time of the previous enabled calculation point, and so on.
And S140, determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine.
Wherein the misfire identification threshold is checked using a calibratable MAP.
Specifically, a misfire judgment threshold value MAP1 corresponding to full cylinder operation, a misfire judgment threshold value MAP2 corresponding to closed Bank2 side cylinder operation, a misfire judgment threshold value MAP3 corresponding to closed Bank1 side cylinder operation,
and S150, performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
Optionally, adjusting the staging time of the engine ignition cylinder to the target staging time according to the engine operating mode comprises:
and if the engine operation mode is full-cylinder operation, the subsection time of the ignition cylinder of the engine is unchanged.
Optionally, adjusting the staging time of the engine ignition cylinder to the target staging time according to the engine operating mode comprises:
if the engine operation mode is a first preset mode, adjusting the subsection time of an engine ignition cylinder to be target subsection time, wherein the target subsection time is equal to the sum of the subsection time of a current ignition cylinder and the subsection time of a target closed cylinder, the target closed cylinder comprises a closed cylinder between the current ignition cylinder and a next ignition cylinder, and the number of closed cylinders in the first preset mode is integral multiple of the number of ignition cylinders.
Where the engine is 12-cylinder, the operating modes of the engine may theoretically include: firstly, 6 cylinders are stably closed, and 6 cylinders work; stably closing 9 cylinders and working 3 cylinders; the stable closing 8 cylinders work 4 cylinders; closing 3 cylinders stably and working 9 cylinders; stably closing 4 cylinders and working 8 cylinders. If the engine is 16-cylinder, the operating modes of the engine include: stably closing 8 cylinders and working 8 cylinders; stably closing 4 cylinders and working 12 cylinders; and thirdly, stably closing 12 cylinders and working 4 cylinders. If the engine is 6-cylinder, the operating modes of the engine may theoretically include: stably closing 3 cylinders and working 3 cylinders; stably closing 4 cylinders and working 2 cylinders; and thirdly, stably closing 2 cylinders and working 4 cylinders. If the engine is 4-cylinder, the operating modes of the engine may theoretically include: stably closing the 2 cylinders and working the 2 cylinders. For example, if the engine is 12 cylinders, the first preset mode may be: the number of closed cylinders is 9 cylinders, and the number of ignition cylinders is 3 cylinders. The first preset mode may also be in other cases, which is not limited in this embodiment of the present invention.
In a specific example, if the engine operation mode is a case where the number of stable closed cylinders in the above operation mode is an integer multiple of the number of operating cylinders, the segment time of the ignition cylinder of the engine is adjusted to a target segment time, wherein the target segment time is equal to the sum of the segment time of the current ignition cylinder and the segment time of a target closed cylinder, wherein the target closed cylinder includes a closed cylinder between the current ignition cylinder and a following ignition cylinder, and wherein the target closed cylinder includes a closed cylinder between the current ignition cylinder and the following ignition cylinder.
Optionally, if the engine operation mode is a first preset mode, adjusting the segment time of the engine ignition cylinder to the target segment time includes:
if the number of closed cylinders is the same as that of ignition cylinders and even cylinders are closed, the sectional time of the odd ignition cylinder of the engine is adjusted to be the sum of the sectional time of the current ignition cylinder and the sectional time of the next closed even cylinder.
Optionally, if the engine operation mode is a first preset mode, adjusting the segment time of the engine ignition cylinder to the target segment time includes:
if the number of closed cylinders is the same as that of ignition cylinders and the odd cylinders are closed, the sectional time of the even ignition cylinder of the engine is adjusted to be the sum of the sectional time of the current ignition cylinder and the sectional time of the next closed odd cylinder.
Optionally, if the engine operation mode is a first preset mode, adjusting the segment time of the engine ignition cylinder to the target segment time includes:
if the state parameter is larger than the misfire judging threshold value, determining that the engine ignition cylinder corresponding to the state parameter is on fire;
periodically counting the fire firing times of an engine ignition cylinder to obtain the fire firing rate;
reporting an emissions nuisance misfire fault if the misfire rate is greater than an emissions superscale threshold;
if the misfire rate is greater than the catalyst threshold value, a catalyst damage misfire fault is reported.
Optionally, after acquiring the segment time of the engine ignition cylinder, the method further includes:
and correcting errors of the segmented time based on a result factor of the tooth difference learning.
Specifically, the segment time measured by the crankshaft position sensor for misfire diagnosis is input, and the segment time is the time required for the crankshaft to rotate through a crankshaft segment interval of a certain cylinder, and the crankshaft segment interval is similar to the crank angle sustained by the power stroke of each cylinder. When a misfire occurs, the engine speed of the corresponding cylinder decreases, so that the crankshaft segment time of the cylinder is extended. In order to improve the accuracy of misfire diagnosis, the crankshaft segment interval should be as long as possible while avoiding overlap of the two cylinder segment intervals. Typically, engine misfire diagnosis will employ a fixed segmented interval length. For a 6-cylinder engine, the length of the crankshaft segment interval a is 720/6-120 °, and for a 12-cylinder engine, the length of the crankshaft segment interval a 720/12-60 °. Therefore, when the engine is in a cylinder closing working mode, the number of working cylinders of the engine is reduced, the effective range of misfire diagnosis can be enlarged by increasing the crankshaft subsection interval, and the diagnosis accuracy is improved.
In a specific example, as shown in fig. 1a, TDC1 is the top dead center of the 1 st ignition cylinder, t1 is the 1 st ignition cylinder segment time, CP1 is the misfire diagnosis calculation point of the 1 st ignition cylinder, and so on, the misfire diagnosis mode method of the embodiment of the present invention will now be described in the case where the engine is an n-cylinder (herein, n ≧ 4 and even integers) and the exhaust system of the engine is divided into two groups (Bank1 and Bank 2). In fact, embodiments of the present invention may be applied as long as the engine has a fixed, closed-cylinder operating mode. As shown in fig. 1b, the embodiment of the present invention includes the following processes:
1. measuring the segmentation time: this step involves measuring the segment time corresponding to the crankshaft segment interval for sequential firing of the cylinders (all) of the engine. The cylinder crankshaft subsection Seg1 approximate to the power stroke of the 1 st ignition cylinder is approximately equal to TDC1-TDC2, the subsection time t1, the cylinder crankshaft subsection Seg2 approximate to the power stroke of the 2 nd ignition cylinder is approximately equal to TDC2-TDC3, the subsection time t2, … …, the cylinder crankshaft subsection Seg (n-1) approximate to the power stroke of the n-1 st ignition cylinder is approximately equal to TDC (n-1) -TDCn, the subsection time t (n-1), the cylinder crankshaft subsection Seg (n) approximate to the power stroke of the n-th ignition cylinder is approximately equal to TDCn-TDC1, and the subsection time tn.
2. And (3) correcting the segment time: and (3) based on a result factor of the tooth difference learning, carrying out error correction on the sectional time measured in the step (1) so as to reduce the influence of the sectional time measurement error caused by the machining error of the mechanical teeth of the crankshaft signal panel.
3. Obtaining an operation mode: and acquiring engine running modes including full-cylinder running and stable cylinder closing running states, wherein the stable cylinder closing running states are divided into a closed Bank1 running state and a closed Bank2 running state.
4. Segmented time preprocessing and storage: if the engine is in the all-cylinder operating mode, then the latest P1 segment time measurements can be stored directly in order, P1 being a calibratable quantity, without additional preprocessing operations. If the engine is in a closed-cylinder running mode, preprocessing operation needs to be carried out on the subsection time collected in the step 1, and the available crankshaft subsection interval and the subsection time of the ignition cylinder are increased. The method comprises the following specific steps: when the Bank2 closes the cylinder and the Bank1 side cylinder does work, if the cylinder is an odd ignition cylinder, the cylinder calculation point CP moves backwards by 1 cylinder, the cylinder segmentation time T is T (i) + T (i-1), wherein T (i) is the segmentation time collected at the current ignition time, and if the cylinder is an even ignition cylinder, no operation is performed. The last (P1)/2 data of T are stored. After the segmented time processing is completed, the ignition cylinder number Cyl used by the subsequent misfire diagnostic algorithm is equal to (Cyl _ I +1)/2, wherein Cyl _ I is the actual ignition cylinder number, and the method is prepared for adapting the misfire diagnostic algorithm in the closed cylinder mode. When the Bank1 closes the cylinder and the Bank2 side cylinder does work, if the cylinder is an even ignition cylinder, the cylinder calculation point CP moves backwards by 1 cylinder, the cylinder segmentation time T is T (i) + T (i-1), wherein T (i) is the segmentation time collected at the current ignition time, and if the cylinder is an odd ignition cylinder, no operation is performed. The last (P1)/2 data of T are stored. After the segmented time processing is completed, the number of the ignition cylinder used by the follow-up misfire diagnostic algorithm is Cyl _ I/2, wherein Cyl _ I is the actual number of the ignition cylinder, and the method is prepared for adapting the misfire diagnostic algorithm in the closed cylinder mode. As shown in fig. 1c, a 12-cylinder engine is taken as an example.
5. Misfire diagnostic enables: the enabling conditions for misfire diagnosis are many, and generally include the presence or absence of a faulty component that affects misfire diagnosis, engine operating conditions, whether the current operating conditions meet requirements, and the like.
The unique enabling conditions of the misfire diagnosis mode of the multi-cylinder engine comprising the cylinder closing mode mainly comprise two points:
after the first, all-cylinder operation, Bank1 cylinder closing operation and Bank2 cylinder closing operation mode are switched, whether the delay of a specific cylinder number P2 is finished or not is judged, and the cylinder number can be marked. And the misfire diagnosis function can be continued only if the delay required by the switching of the working mode is finished and other misfire diagnosis enabling conditions are met.
Second, the conditions for the operation mode of the engine are added, when the engine is in the full-cylinder operation mode, the ignition CP point of each cylinder is enabled, when the engine is in the closed-cylinder operation mode, if the Bank2 side cylinder is closed, the ignition CP point of the odd ignition cylinder is enabled, and the ignition CP point of the even ignition cylinder is not enabled. If closing the cylinder on the Bank1 side, the CP point of the odd ignition cylinder is not enabled only when the CP point of the even ignition cylinder is enabled.
6. And (3) misfire diagnosis algorithm operation: there are many misfire diagnostic algorithms based on the segment time, and the segment time of a plurality of time points is used for operation output according to the algorithm. This general algorithm is not the core innovation of the present invention, and in theory any misfire diagnostic algorithm can be applied here, represented here as a function: f (T (i), T (i-1), … …, T (i-n)); where n is the number of engine cylinders, T (i) is the latest staging time, T (i-1) is the staging time of the previous enabled calculation point, and so on.
7. Selecting a corresponding MAP based on the operating mode: the abnormal misfire judgment threshold value is obtained by adopting a calibratable MAP. The calibration MAP1 corresponding to full-cylinder operation, the calibration MAP2 corresponding to closed Bank2 side cylinder operation and the calibration MAP3 corresponding to closed Bank1 side cylinder operation need to be distinguished, namely corresponding special MAP is needed to correspond to each engine in each engine stable operation mode.
8. Misfire determination: the result of the misfire diagnostic algorithm calculation output is compared with the value found in the calibration MAP corresponding to the corresponding engine operating mode. And when the operation output value of the misfire diagnosis algorithm of a certain ignition cylinder is greater than the threshold value obtained by calibrating the MAP, the cylinder is considered to have the misfire phenomenon. Regardless of the misfire determination result, the ignition cylinder number needs to be reduced here. When closing the cylinder on Bank2 side, the ignition cylinder number Cyl _ I ═ Cyl × 2-1. This is done to restore the actual firing cylinder number, avoiding cylinder number confusion. When the Bank1 side closes the cylinder, the ignition cylinder number Cyl _ I is Cyl × 2. This is done to restore the actual firing cylinder number, avoiding cylinder number confusion.
9. And (4) fire statistics: counting the misfire frequency of each cylinder by taking a certain number of engine cycles as a period. When a cylinder detects 1 misfire, the cylinder misfire count statistics are accumulated 1 time.
10. And (3) fault judgment and processing: and determining the misfire rate in the statistical period according to the counted misfire frequency of each cylinder according to requirements. When the misfire rate within statistical period 1 is greater than a threshold that would result in emissions being exceeded, an emission damage misfire fault is reported. When the misfire rate within statistical period 2 is greater than a threshold value that may cause the catalyst to overheat, a catalyst damage misfire fault is reported. On the premise of fire fault, if more than 90% of fire occurs in a specific cylinder, reporting single-cylinder fire fault, otherwise reporting multi-cylinder fire fault.
According to the technical scheme of the embodiment, the subsection time of the ignition cylinder of the engine and the running mode of the engine are obtained; adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode; determining the state parameters of an engine ignition cylinder according to the target segment time; determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine; and performing misfire diagnosis according to the state parameters and the misfire judgment threshold value so as to improve the misfire diagnosis accuracy of the large-displacement multi-cylinder engine with the stable cylinder closing working mode.
Example two
Fig. 2 is a schematic structural diagram of a misfire diagnostic apparatus according to a second embodiment of the present invention. The embodiment may be applicable to the case of fire diagnosis, and the apparatus may be implemented in software and/or hardware, and may be integrated into any device providing a fire diagnosis function, as shown in fig. 2, where the apparatus XX specifically includes: an acquisition module 210, an adjustment module 220, a first determination module 230, a second determination module 240, and a diagnostic module 250.
The obtaining module 210 is configured to obtain a segment time of an engine ignition cylinder and an operation mode of an engine;
an adjustment module 220 for adjusting a staging time of an engine ignition cylinder to a target staging time according to the engine operating mode;
a first determination module 230 for determining a state parameter of an engine ignition cylinder based on a target segment time;
a second determination module 240 for determining a misfire identification threshold for the engine ignition cylinder based on the operating mode of the engine;
and the diagnosis module 250 is used for performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
Optionally, the adjusting module is specifically configured to:
and if the engine operation mode is full-cylinder operation, the subsection time of the ignition cylinder of the engine is unchanged.
Optionally, the adjusting module is specifically configured to:
if the engine operation mode is a first preset mode, adjusting the subsection time of an engine ignition cylinder to be target subsection time, wherein the target subsection time is equal to the sum of the subsection time of a current ignition cylinder and the subsection time of a target closed cylinder, the target closed cylinder comprises a closed cylinder between the current ignition cylinder and a next ignition cylinder, and the number of closed cylinders in the first preset mode is integral multiple of the number of ignition cylinders.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
According to the technical scheme of the embodiment, the subsection time of the ignition cylinder of the engine and the running mode of the engine are obtained; adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode; determining the state parameters of an engine ignition cylinder according to the target segment time; determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine; and performing misfire diagnosis according to the state parameters and the misfire judgment threshold value so as to improve the misfire diagnosis accuracy of the large-displacement multi-cylinder engine with the stable cylinder closing working mode.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a computer device in a third embodiment of the present invention. FIG. 3 illustrates a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention. The computer device 12 shown in FIG. 3 is only an example and should not impose any limitation on the scope of use or functionality of embodiments of the present invention.
As shown in FIG. 3, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, and commonly referred to as a "hard drive"). Although not shown in FIG. 3, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The processing unit 16 executes various functional applications and data processing by executing programs stored in the system memory 28, for example, implementing a misfire diagnostic method provided by an embodiment of the present invention:
acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode;
determining the state parameters of an engine ignition cylinder according to the target segment time;
determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the misfire diagnosis method as provided in all the inventive embodiments of the present application:
acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode;
determining the state parameters of an engine ignition cylinder according to the target segment time;
determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer 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 computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer 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. In the context of this document, a computer 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 computer readable signal medium may include a propagated data signal with computer 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 computer readable signal medium may also be any computer readable medium that is not a computer 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 embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, 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 user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A misfire diagnostic method characterized by comprising:
acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
adjusting the subsection time of an engine ignition cylinder to a target subsection time according to the engine running mode;
determining the state parameters of an engine ignition cylinder according to the target segment time;
determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
2. The method of claim 1, wherein adjusting the staging time for an engine firing cylinder to a target staging time based on the engine operating mode comprises:
and if the engine operation mode is full-cylinder operation, the subsection time of the ignition cylinder of the engine is unchanged.
3. The method of claim 1, wherein adjusting the staging time for an engine firing cylinder to a target staging time based on the engine operating mode comprises:
if the engine operation mode is a first preset mode, adjusting the subsection time of an engine ignition cylinder to be target subsection time, wherein the target subsection time is equal to the sum of the subsection time of a current ignition cylinder and the subsection time of a target closed cylinder, the target closed cylinder comprises a closed cylinder between the current ignition cylinder and a next ignition cylinder, and the number of closed cylinders in the first preset mode is integral multiple of the number of ignition cylinders.
4. The method of claim 3, wherein adjusting the staging time of the engine firing cylinder to the target staging time if the engine operating mode is a first preset mode comprises:
if the number of closed cylinders is the same as that of ignition cylinders and even cylinders are closed, the sectional time of the odd ignition cylinder of the engine is adjusted to be the sum of the sectional time of the current ignition cylinder and the sectional time of the next closed even cylinder.
5. The method of claim 3, wherein adjusting the staging time of the engine firing cylinder to the target staging time if the engine operating mode is a first preset mode comprises:
if the number of closed cylinders is the same as that of ignition cylinders and the odd cylinders are closed, the sectional time of the even ignition cylinder of the engine is adjusted to be the sum of the sectional time of the current ignition cylinder and the sectional time of the next closed odd cylinder.
6. The method according to any one of claims 1-5, characterized in that performing misfire diagnosis in dependence of the condition parameter and a misfire judgment threshold value comprises:
if the state parameter is larger than the misfire judging threshold value, determining that the engine ignition cylinder corresponding to the state parameter is on fire;
periodically counting the fire firing times of an engine ignition cylinder to obtain the fire firing rate;
reporting an emissions nuisance misfire fault if the misfire rate is greater than an emissions superscale threshold;
if the misfire rate is greater than the catalyst threshold value, a catalyst damage misfire fault is reported.
7. The method of claim 1, wherein after acquiring the staging time for the engine firing cylinder, further comprising:
and correcting errors of the segmented time based on a result factor of the tooth difference learning.
8. A misfire diagnostic apparatus characterized by comprising:
the acquisition module is used for acquiring the subsection time of an engine ignition cylinder and the running mode of the engine;
the adjusting module is used for adjusting the subsection time of the engine ignition cylinder to be target subsection time according to the engine running mode;
the first determination module is used for determining the state parameter of the engine ignition cylinder according to the target subsection time;
the second determination module is used for determining a misfire judgment threshold value of the engine ignition cylinder according to the running mode of the engine;
and the diagnosis module is used for performing misfire diagnosis according to the state parameter and the misfire judgment threshold value.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-7.
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| CN114544186A (en) * | 2022-02-23 | 2022-05-27 | 中国第一汽车股份有限公司 | Engine fire diagnosis method and vehicle |
| CN115217625A (en) * | 2021-06-17 | 2022-10-21 | 广州汽车集团股份有限公司 | Engine fire diagnosis calibration method, device, storage medium, equipment and system |
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