A compression ignition condition recognition method, device, equipment and storage medium

Abstract

A compression ignition condition recognition method, device, equipment and storage medium are disclosed. The method is applied to an engine provided with a knock sensor, and the method comprises: acquiring a first signal corresponding to the engine operation collected by the knock sensor; performing frequency spectrum analysis on the first signal to obtain a first parameter value corresponding to the first signal; acquiring a signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition; determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value; and executing a control strategy corresponding to the compression ignition condition.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a method, apparatus, device, and storage medium for identifying compression ignition conditions. Background Technology

[0002] In related technologies, compression ignition occurs when the cylinder temperature reaches the ignition temperature determined by the composition of the air-fuel mixture. If compression ignition is initiated near the top dead center of compression, the fuel efficiency of in-cylinder combustion is maximized, and the cylinder temperature increases with the increase in cylinder pressure. In spark-ignition-triggered homogeneous charge compression ignition (SPCCI) combustion, the cylinder pressure is the result of two pressure increases: the pressure rise caused by the piston's compression work during the compression stroke and the pressure rise caused by the exothermic reaction of ignition combustion. On the other hand, if compression ignition is initiated near the top dead center of compression in SPCCI combustion, it can sometimes lead to excessive cylinder pressure and excessive combustion noise. In this case, if the ignition timing is delayed, compression ignition will occur during the significant piston descent in the expansion stroke, thus suppressing combustion noise. However, this reduces the engine's fuel efficiency. In engines using spark-ignition-compression ignition, to balance the suppression of combustion noise and the improvement of fuel consumption performance, it is necessary to accurately determine the occurrence of the spark-compression ignition mode. There is currently no effective solution to this problem. Summary of the Invention

[0003] To address the existing technical problems, the main objective of this invention is to provide a method, apparatus, device, and storage medium for identifying compression ignition conditions.

[0004] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0005] In a first aspect, the present invention provides a publicly disclosed compression ignition identification scheme applied to an engine equipped with a knock sensor, the method comprising:

[0006] The knock sensor acquires the first signal corresponding to the engine operation.

[0007] Perform spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal;

[0008] Obtain the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition;

[0009] The compression ignition condition of the engine is determined based on the first parameter value and the signal threshold value;

[0010] The control strategy corresponding to the compression ignition condition shall be executed.

[0011] In the above scheme, the engine includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, and the knock sensor includes at least a first knock sensor and a second knock sensor; the first knock sensor is disposed between the first cylinder and the second cylinder; the second knock sensor is disposed between the third cylinder and the fourth cylinder; the first signal includes a first sub-signal and a second sub-signal; acquiring the first signal corresponding to the engine operation collected by the knock sensor includes:

[0012] The first sub-signal corresponding to the first cylinder or the second cylinder is acquired by the first knock sensor.

[0013] The second sub-signal corresponding to the third or fourth cylinder is acquired by the second knock sensor.

[0014] In the above scheme, the first knock sensor is disposed at a first position on the cylinder barrel of the first cylinder; the second knock sensor is disposed at a second position on the cylinder barrel of the third cylinder.

[0015] In the above scheme, the step of performing spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal includes:

[0016] Perform a Fourier transform on the first signal to obtain the first parameter value corresponding to the first signal.

[0017] In the above scheme, the compression ignition condition includes at least a first compression ignition condition and a second compression ignition condition; the first compression ignition condition indicates that the engine is in spark combustion mode; the second compression ignition condition indicates that the engine is in knock mode; the signal threshold value includes a first signal threshold value and a second signal threshold value; the first signal threshold value indicates the signal threshold value corresponding to the first compression ignition condition; the second signal threshold value indicates the signal threshold value corresponding to the second compression ignition condition; obtaining the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition includes:

[0018] Obtain the first signal threshold value corresponding to the first compression ignition condition;

[0019] Obtain the second signal threshold value corresponding to the second compression ignition condition.

[0020] In the above scheme, the compression ignition condition further includes a third compression ignition condition; the third compression ignition condition indicates that the engine is in spark-compression ignition combustion mode; determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value includes:

[0021] If the first parameter value is less than or equal to the first signal threshold value, the engine is determined to be in the first compression ignition condition.

[0022] If the first parameter value is greater than or equal to the second signal threshold value, the engine is determined to be in the second compression ignition condition;

[0023] If the first parameter value is greater than the first signal threshold value and less than the second signal threshold value, the engine is determined to be in the third compression ignition condition.

[0024] In the above scheme, the control strategy corresponding to the compression ignition condition includes:

[0025] Execute the control strategy corresponding to the first compression ignition condition;

[0026] Alternatively, execute the control strategy corresponding to the second compression ignition condition;

[0027] Alternatively, the control strategy corresponding to the third compression ignition condition may be executed.

[0028] Secondly, embodiments of the present invention also provide a device for identifying compression ignition conditions, applied to an engine equipped with a knock sensor. The device includes: a first acquisition unit, an analysis unit, a second acquisition unit, a determination unit, and an execution unit, wherein...

[0029] The first acquisition unit is used to acquire the first signal corresponding to the engine operation collected by the knock sensor;

[0030] The analysis unit is used to perform spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal;

[0031] The second acquisition unit is used to acquire the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition;

[0032] The determining unit is used to determine the compression ignition condition of the engine based on the first parameter value and the signal threshold value;

[0033] The execution unit is used to execute the control strategy corresponding to the compression ignition condition.

[0034] Thirdly, embodiments of the present invention provide a storage medium storing a computer program; when the computer program is executed by a processor, it implements the steps of any of the methods described above.

[0035] Fourthly, embodiments of the present invention provide a compression ignition condition identification device, the compression ignition condition identification device comprising: a processor and a memory for storing a computer program capable of running on the processor, wherein the processor, when running the computer program, executes the steps of any of the methods described above.

[0036] This invention provides a method, apparatus, device, and storage medium for identifying compression ignition conditions. The method is applied to an engine equipped with a knock sensor. The method includes: acquiring a first signal corresponding to engine operation collected by the knock sensor; performing spectral analysis on the first signal to obtain a first parameter value corresponding to the first signal; acquiring a signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition; determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value; and executing a control strategy corresponding to the compression ignition condition. By employing the technical solution of this invention, different engine operating conditions can be determined based on the output signal of the knock sensor, thus accurately identifying compression ignition conditions and reducing costs by using existing knock sensors. Attached Figure Description

[0037] Figure 1 A flowchart illustrating a method for identifying compression ignition conditions provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of an engine provided in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a detonation signal after spectral analysis during an ignition phenomenon, provided as an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of a detonation signal after spectral analysis in an ignition compression ignition phenomenon provided by an embodiment of the present invention;

[0041] Figure 5 A flowchart illustrating another method for identifying compression ignition conditions provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of the structure of a compression ignition condition identification device provided in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the hardware structure of a device for identifying compression ignition conditions according to an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the specific technical solutions of the invention will be further described in detail below with reference to the accompanying drawings of the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0046] Figure 1This is a flowchart illustrating a method for identifying compression ignition conditions according to an embodiment of the present invention. Figure 1 As shown, the method is applied to an engine equipped with a knock sensor, and the method includes:

[0047] S101: Obtain the first signal corresponding to the engine operation collected by the knock sensor;

[0048] S102: Perform spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal;

[0049] S103: Obtain the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition;

[0050] S104: Determine the compression ignition condition of the engine based on the first parameter value and the signal threshold value;

[0051] S105: Execute the control strategy corresponding to the compression ignition condition.

[0052] It should be noted that the number of knock sensors is at least two.

[0053] In S101, acquiring the first signal corresponding to the engine operation collected by the knock sensor can be understood as follows: the engine includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder; the knock sensor includes at least a first knock sensor and a second knock sensor; the first knock sensor is disposed between the first cylinder and the second cylinder; the second knock sensor is disposed between the third cylinder and the fourth cylinder; the first signal includes a first sub-signal and a second sub-signal; the first sub-signal corresponding to the first cylinder or the second cylinder collected by the first knock sensor is acquired; the second sub-signal corresponding to the third cylinder or the fourth cylinder collected by the second knock sensor is acquired. For example, the engine generates vibrations during operation, which are transmitted to the knock sensor through the cylinder block within the engine, and the knock sensor collects the signal during this process.

[0054] In S102, performing spectral analysis on the first signal to obtain the first parameter value corresponding to the first signal can be understood as performing a Fourier transform on the first signal to obtain the first parameter value corresponding to the first signal. It should be noted that the first parameter value represents a parameter value that shows significant change in the first signal.

[0055] In S103, the compression ignition condition includes at least a first compression ignition condition and a second compression ignition condition; the first compression ignition condition indicates that the engine is in spark combustion mode; the second compression ignition condition indicates that the engine is in knock mode. The signal threshold value includes a first threshold value and a second threshold value; the first signal threshold value indicates the signal threshold value corresponding to the first compression ignition condition; the second signal threshold value indicates the signal threshold value corresponding to the second compression ignition condition.

[0056] In S104, the compression ignition condition further includes a third compression ignition condition; the third compression ignition condition indicates that the engine is in a spark-compression ignition combustion mode. Determining the engine's compression ignition condition based on the first parameter value and the signal threshold value can be understood as follows: if the first parameter value is less than or equal to the first signal threshold value, the engine is determined to be in the first compression ignition condition; if the first parameter value is greater than or equal to the second signal threshold value, the engine is determined to be in the second compression ignition condition; and if the first parameter value is greater than the first signal threshold value and less than the second signal threshold value, the engine is determined to be in the third compression ignition condition.

[0057] In S105, executing the control strategy corresponding to the compression ignition condition can be understood as executing the corresponding control strategy according to different compression ignition conditions, that is, executing the control strategy corresponding to the first compression ignition condition according to the first compression ignition condition; executing the control strategy corresponding to the second compression ignition condition based on the second compression ignition condition; and executing the control strategy corresponding to the third compression ignition condition according to the third compression ignition condition.

[0058] By adopting the technical solution of this invention, the signal value is collected by the knock sensor and compared with the signal threshold value, so as to accurately determine the compression ignition condition of the engine. Furthermore, the use of the existing knock sensor in the engine to identify the compression ignition condition can reduce costs.

[0059] In an optional embodiment of the present invention, the engine includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, and the knock sensor includes at least a first knock sensor and a second knock sensor; the first knock sensor is disposed between the first cylinder and the second cylinder; the second knock sensor is disposed between the third cylinder and the fourth cylinder; the first signal includes a first sub-signal and a second sub-signal; acquiring the first signal corresponding to the engine operation collected by the knock sensor includes: acquiring the first sub-signal corresponding to the first cylinder or the second cylinder collected by the first knock sensor; and acquiring the second sub-signal corresponding to the third cylinder or the fourth cylinder collected by the second knock sensor.

[0060] Figure 2This is a schematic diagram of the structure of an engine provided in an embodiment of the present invention, such as... Figure 2 As shown. The following will combine... Figure 2 To clarify, the first cylinder is cylinder 1; the second cylinder is cylinder 2; the third cylinder is cylinder 3; and the fourth cylinder is cylinder 4. The first knock sensor is located between cylinders 1 and 2, and the second knock sensor is located between cylinders 3 and 4.

[0061] The system acquires the first sub-signal corresponding to the first cylinder or the second cylinder from the first knock sensor; and acquires the second sub-signal corresponding to the third cylinder or the fourth cylinder from the second knock sensor. This can be understood as the first knock sensor acquiring the signal of cylinder 1 or 2, and the second knock sensor acquiring the signal of cylinder 3 or 4.

[0062] By adopting the technical solution of this invention, the compression ignition condition can be determined by collecting signals from the existing knock sensor in the engine and by using the collected signals and signal threshold values, thereby reducing costs.

[0063] In an optional embodiment of the present invention, the first knock sensor is disposed at a first position of the cylinder barrel of the first cylinder; the second knock sensor is disposed at a second position of the cylinder barrel of the third cylinder.

[0064] In this embodiment, the first position can be understood as the position one-third of the way through the cylinder barrel of the first cylinder; the second position can be understood as the position one-third of the way through the cylinder barrel of the third cylinder. It should be noted that, as... Figure 2 As shown, the upper surfaces of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder are in contact with the upper surface of the engine block; the first knock sensor may also be located at 1 / 3 of the cylinder barrel of the second cylinder; the second knock sensor may also be located at 1 / 3 of the cylinder barrel of the fourth cylinder; for example, the first knock sensor is located at approximately 1 / 3 of the cylinder barrel from the upper surface of the cylinder block, and the second knock sensor is located at approximately 1 / 3 of the cylinder barrel from the upper surface of the cylinder block.

[0065] It should be noted that the first knock sensor is close to the first and second cylinders. Therefore, the first and second cylinders use the feedback signal from the first knock sensor to determine the compression ignition condition. The second knock sensor is close to the third and fourth cylinders. Therefore, the third and fourth cylinders use the second knock sensor to determine the compression ignition condition.

[0066] By adopting the technical solution of this invention, the cylinder block signal is collected by a knock sensor, and the compression ignition condition is identified based on the collected signal and the signal threshold value, which can reduce costs.

[0067] In an optional embodiment of the present invention, the step of performing spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal includes: performing Fourier transform on the first signal to obtain the first parameter value corresponding to the first signal.

[0068] In this embodiment, performing a Fourier transform on the first signal to obtain the corresponding first parameter value can be understood as performing a Fourier transform on the first signal, i.e., after spectral analysis, obtaining the parameter value with a large change in the first signal. It should be noted that the optimal method for performing a Fourier transform on the first signal is to perform a Fast Fourier Transform (FFT).

[0069] Figure 3 This is a schematic diagram of a detonation signal after spectral analysis during an ignition phenomenon, provided by an embodiment of the present invention. Figure 4 This is a schematic diagram of a detonation signal after spectral analysis in an ignition compression ignition phenomenon, provided by an embodiment of the present invention. Figure 3 As shown, in the ignition phenomenon, the signal did not change significantly after spectral analysis, therefore no ignition compression ignition phenomenon occurred; as Figure 4 As shown, in the ignition compression ignition phenomenon, the signal will change significantly after spectrum analysis, especially around 8kHz (kilohertz).

[0070] It should be noted that the first parameter value can be 6kHz to 10kHz, and the optimal value can be 8kHz.

[0071] By employing the technical solution of this invention, after the signal undergoes spectrum analysis, the compression ignition condition can be identified based on whether there are significant changes in the signal between 6kHz and 10kHz.

[0072] In an optional embodiment of the present invention, the compression ignition condition includes at least a first compression ignition condition and a second compression ignition condition; the first compression ignition condition indicates that the engine is in spark combustion mode; the second compression ignition condition indicates that the engine is in knock mode; the signal threshold value includes a first signal threshold value and a second signal threshold value; the first signal threshold value indicates the signal threshold value corresponding to the first compression ignition condition; the second signal threshold value indicates the signal threshold value corresponding to the second compression ignition condition; obtaining the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition includes: obtaining the first signal threshold value corresponding to the first compression ignition condition; obtaining the second signal threshold value corresponding to the second compression ignition condition.

[0073] It should be noted that the second compression ignition condition indicates that the engine is in knock mode, and optimally, the second compression ignition condition indicates that the engine is in super knock mode.

[0074] In this embodiment, the first signal threshold value represents the signal threshold value corresponding to the first compression ignition condition. For example, it can be illustrated as limit 1 collected by the knock sensor during normal ignition and combustion. It should be noted that limit 1 can be an empirical value. The second signal threshold value represents the signal threshold value corresponding to the second compression ignition condition. For example, it can be illustrated as limit 2 collected by the knock sensor during super-knock. It should be noted that limit 2 is an empirical value. It is understood that limit 1 is less than limit 2.

[0075] By employing the technical solution of this invention, threshold values ​​corresponding to different compression ignition conditions can be obtained, allowing the collected signals to be compared with these threshold values, thereby identifying the compression ignition conditions.

[0076] In an optional embodiment of the present invention, the compression ignition condition further includes a third compression ignition condition; the third compression ignition condition indicates that the engine is in a spark-compression ignition combustion mode; determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value includes: determining the engine to be in the first compression ignition condition when the first parameter value is less than or equal to the first signal threshold value; determining the engine to be in the second compression ignition condition when the first parameter value is greater than or equal to the second signal threshold value; and determining the engine to be in the third compression ignition condition when the first parameter value is greater than the first signal threshold value and less than the second signal threshold value.

[0077] In this embodiment, when the first parameter value is less than or equal to the first signal threshold value, the engine is determined to be in the first compression ignition condition; when the first parameter value is greater than or equal to the second signal threshold value, the engine is determined to be in the second compression ignition condition; when the first parameter value is greater than the first signal threshold value and less than the second signal threshold value, the engine is determined to be in the third compression ignition condition. For example, when the 8kHz signal value is less than or equal to limit 1, it is determined to be in ignition combustion mode; when the 8kHz signal value is greater than or equal to limit 2, it is determined to be in super knock mode; when the 8kHz signal value is greater than limit 1 or less than limit 2, it is determined to be in ignition compression ignition combustion mode.

[0078] By employing the technical solution of this invention, the compression ignition condition can be accurately determined by comparing the first parameter value with the first signal threshold value and the second signal threshold value.

[0079] In an optional embodiment of the present invention, executing the control strategy corresponding to the compression ignition condition includes: executing the control strategy corresponding to the first compression ignition condition; or, executing the control strategy corresponding to the second compression ignition condition; or, executing the control strategy corresponding to the third compression ignition condition.

[0080] In this embodiment, the execution of the control strategy corresponding to the compression ignition condition can be understood as follows: after determining the compression ignition condition mode, the signal is transmitted to the Electronic Control Unit (ECU), and the ECU executes the corresponding control logic, including the ignition angle, injection time, and number of injections.

[0081] The execution of the control strategy corresponding to the first compression ignition condition; or, the execution of the control strategy corresponding to the second compression ignition condition; or, the execution of the control strategy corresponding to the third compression ignition condition can be illustrated as follows: after determining that it is an ignition combustion mode, a signal is transmitted to the ECU, and the ECU executes the ignition combustion control logic; after determining that it is a super knock phenomenon, a signal is transmitted to the ECU, and the ECU executes the super knock control logic; after determining that it is an ignition compression ignition combustion mode, a signal is transmitted to the ECU, and the ECU executes the ignition compression ignition combustion control logic.

[0082] By employing the technical solution of this invention, corresponding control logic is executed according to different operating conditions, which can improve combustion efficiency while suppressing combustion noise.

[0083] To facilitate understanding, here is an example of a specific ignition / compression ignition determination logic. Figure 5 A flowchart illustrating another method for identifying compression ignition conditions provided in an embodiment of the present invention is shown below. Figure 5 As shown, the knock sensor first collects signals. After spectrum analysis, the 8kHz signal is analyzed. If the 8kHz signal value is less than the limit 1 collected by the knock sensor during normal ignition and combustion, it is determined to be in ignition and combustion mode. The signal is transmitted to the ECU, which executes the ignition and combustion control logic. If the 8kHz signal value is greater than the limit 2 collected by the knock sensor during super knock, it is determined to be a super knock phenomenon. The signal is transmitted to the ECU, which executes the super knock control logic. If the 8kHz signal value is greater than the limit 1 and less than the limit 2, it is determined to be in ignition-compression ignition mode. The signal is transmitted to the ECU, which executes the ignition-compression ignition control logic.

[0084] Based on the same inventive concept as described above Figure 6 This is a schematic diagram of a compression ignition condition identification device provided in an embodiment of the present invention. The device 600 is applied to an engine equipped with a knock sensor. The device 600 includes: a first acquisition unit 601, an analysis unit 602, a second acquisition unit 603, a determination unit 604, and an execution unit 605.

[0085] The first acquisition unit 601 is used to acquire the first signal corresponding to the engine operation collected by the knock sensor;

[0086] The analysis unit 602 is used to perform spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal;

[0087] The second acquisition unit 603 is used to acquire the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition;

[0088] The determining unit 604 is used to determine the compression ignition condition of the engine based on the first parameter value and the signal threshold value;

[0089] The execution unit 605 is used to execute the control strategy corresponding to the compression ignition condition.

[0090] In some embodiments, the first acquisition unit 601 is further configured to acquire the first sub-signal corresponding to the first cylinder or the second cylinder collected by the first knock sensor; and acquire the second sub-signal corresponding to the third cylinder or the fourth cylinder collected by the second knock sensor.

[0091] In some embodiments, the first knock sensor is disposed at a first position on the cylinder barrel of the first cylinder; the second knock sensor is disposed at a second position on the cylinder barrel of the third cylinder.

[0092] In some embodiments, the analysis unit 602 is further configured to perform a Fourier transform on the first signal to obtain a first parameter value corresponding to the first signal.

[0093] In some embodiments, the second acquisition unit 603 is further configured to acquire the first signal threshold value corresponding to the first compression ignition condition; and acquire the second signal threshold value corresponding to the second compression ignition condition.

[0094] In some embodiments, the determining unit 604 is further configured to determine the engine as the first compression ignition condition when the first parameter value is less than or equal to the first signal threshold value; determine the engine as the second compression ignition condition when the first parameter value is greater than or equal to the second signal threshold value; and determine the engine as the third compression ignition condition when the first parameter value is greater than the first signal threshold value and less than the second signal threshold value.

[0095] In some embodiments, the execution unit 605 is further configured to execute the control strategy corresponding to the first compression ignition condition; or, execute the control strategy corresponding to the second compression ignition condition; or, execute the control strategy corresponding to the third compression ignition condition.

[0096] It should be noted that the compression ignition condition identification device provided in this embodiment of the invention and the compression ignition condition identification method provided in the aforementioned embodiment of the invention belong to the same inventive concept. The meanings of the terms used here have been explained in detail above and will not be repeated here.

[0097] This invention also provides a storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] This invention also provides a device for identifying compression ignition conditions. The device includes a processor and a memory for storing a computer program that can run on the processor. When the processor runs the computer program, it executes the steps of the method embodiments described above stored in the memory.

[0099] Figure 7 This is a schematic diagram of a hardware structure for a compression ignition condition identification device according to an embodiment of the present invention. The compression ignition condition identification device 700 includes at least one processor 701 and a memory 702. Optionally, the compression ignition condition identification device 700 may further include at least one communication interface 703. The various components in the compression ignition condition identification device 700 are coupled together through a bus system 704. It is understood that the bus system 704 is used to realize the connection and communication between these components. In addition to a data bus, the bus system 704 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 7 The general designated all buses as Bus System 704.

[0100] It is understood that memory 702 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Sync Link Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memory 702 described in this embodiment of the invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0101] The memory 702 in this embodiment of the invention is used to store various types of data to support the operation of the compression ignition condition identification device 700. Examples of such data include any computer program for operating on the compression ignition condition identification device 700, and programs implementing the methods of this embodiment of the invention may be included in the memory 702.

[0102] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by processor 701. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which is located in memory. The processor reads information from the memory and, in conjunction with its hardware, completes the steps of the aforementioned method.

[0103] In an exemplary embodiment, the compression ignition condition identification device 700 may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to perform the above-described method.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0105] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0106] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0107] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] Alternatively, if the integrated units of this invention are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0109] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for identifying compression ignition conditions, characterized in that, Applied to engines equipped with knock sensors, the method includes: The knock sensor acquires the first signal corresponding to the engine operation. Perform spectrum analysis on the first signal to obtain the first parameter value corresponding to the first signal; the first parameter value is a signal value between 6kHz and 10kHz. Obtain the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition; The compression ignition condition of the engine is determined based on the first parameter value and the signal threshold value; Execute the control strategy corresponding to the compression ignition condition; The compression ignition conditions include a first compression ignition condition, a second compression ignition condition, and a third compression ignition condition; the third compression ignition condition indicates that the engine is in a spark-compression ignition combustion mode; determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value includes: If the first parameter value is greater than the first signal threshold value and less than the second signal threshold value, the engine is determined to be in the third compression ignition condition; the first signal threshold value is the signal threshold value corresponding to the first compression ignition condition; and the second signal threshold value is the signal threshold value corresponding to the second compression ignition condition.

2. The method according to claim 1, characterized in that, The engine includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder. The knock sensor includes at least a first knock sensor and a second knock sensor. The first knock sensor is disposed between the first cylinder and the second cylinder. The second knock sensor is disposed between the third cylinder and the fourth cylinder. The first signal includes a first sub-signal and a second sub-signal; The step of acquiring the first signal corresponding to the engine operation collected by the knock sensor includes: The first sub-signal corresponding to the first cylinder or the second cylinder is acquired by the first knock sensor. The second sub-signal corresponding to the third or fourth cylinder is acquired by the second knock sensor.

3. The method according to claim 2, characterized in that, The first knock sensor is located at a first position on the cylinder barrel of the first cylinder; the second knock sensor is located at a second position on the cylinder barrel of the third cylinder.

4. The method according to claim 1, characterized in that, The step of performing spectral analysis on the first signal to obtain the first parameter value corresponding to the first signal includes: Perform a Fourier transform on the first signal to obtain the first parameter value corresponding to the first signal.

5. The method according to claim 1, characterized in that, The first compression ignition condition indicates that the engine is in spark combustion mode; the second compression ignition condition indicates that the engine is in knock mode; the signal threshold value includes a first signal threshold value and a second signal threshold value; the first signal threshold value indicates the signal threshold value corresponding to the first compression ignition condition; the second signal threshold value indicates the signal threshold value corresponding to the second compression ignition condition; The step of obtaining the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition includes: Obtain the first signal threshold value corresponding to the first compression ignition condition; Obtain the second signal threshold value corresponding to the second compression ignition condition.

6. The method according to claim 5, characterized in that, Determining the compression ignition condition of the engine based on the first parameter value and the signal threshold value includes: If the first parameter value is less than or equal to the first signal threshold value, the engine is determined to be in the first compression ignition condition. If the first parameter value is greater than or equal to the second signal threshold value, the engine is determined to be in the second compression ignition condition.

7. The method according to claim 6, characterized in that, The control strategy for executing the compression ignition condition includes: Execute the control strategy corresponding to the first compression ignition condition; Alternatively, execute the control strategy corresponding to the second compression ignition condition; Alternatively, the control strategy corresponding to the third compression ignition condition may be executed.

8. A device for identifying compression ignition conditions, characterized in that, The device, applicable to engines equipped with knock sensors, comprises: a first acquisition unit, an analysis unit, a second acquisition unit, a determination unit, and an execution unit, wherein... The first acquisition unit is used to acquire the first signal corresponding to the engine operation collected by the knock sensor; The analysis unit is used to perform spectrum analysis on the first signal to obtain a first parameter value corresponding to the first signal; the first parameter value is a signal value between 6kHz and 10kHz. The second acquisition unit is used to acquire the signal threshold value corresponding to each compression ignition condition in at least one compression ignition condition; The determining unit is used to determine the compression ignition condition of the engine based on the first parameter value and the signal threshold value; The execution unit is used to execute the control strategy corresponding to the compression ignition condition; The compression ignition conditions include a first compression ignition condition, a second compression ignition condition, and a third compression ignition condition; the third compression ignition condition indicates that the engine is in a spark-compression ignition combustion mode; the determining unit is further configured to determine that the engine is in the third compression ignition condition when the first parameter value is greater than a first signal threshold value and less than a second signal threshold value; the first signal threshold value is the signal threshold value corresponding to the first compression ignition condition; the second signal threshold value is the signal threshold value corresponding to the second compression ignition condition.

9. A storage medium, characterized in that, The storage medium stores a computer program; when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

10. A device for identifying compression ignition conditions, characterized in that, The device for identifying compression ignition conditions includes: a processor and a memory for storing a computer program capable of running on the processor, wherein the processor, when running the computer program, performs the steps of the method according to any one of claims 1 to 7.

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