CN115750086A - Engine in-cylinder pressure detection method and system - Google Patents
Engine in-cylinder pressure detection method and system Download PDFInfo
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- CN115750086A CN115750086A CN202211584419.7A CN202211584419A CN115750086A CN 115750086 A CN115750086 A CN 115750086A CN 202211584419 A CN202211584419 A CN 202211584419A CN 115750086 A CN115750086 A CN 115750086A
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Abstract
The invention relates to the technical field of diesel engines, and provides a method and a system for detecting the in-cylinder pressure of an engine, wherein the method for detecting the in-cylinder pressure of the engine comprises the steps of synchronously acquiring cylinder pressure signals of all channels; carrying out range conversion and processing on the cylinder pressure signals of each channel to obtain the actual cylinder pressure value of each channel; and calculating a plurality of actual cylinder pressure values to obtain a target curve, and determining an in-cylinder pressure combustion characteristic value according to the target curve. The invention further provides a system for detecting the in-cylinder pressure of the engine. By adopting the method for detecting the pressure in the cylinder of the engine, the cylinder pressure signals of all channels can be synchronously acquired, the target curve is synchronously acquired along with the acquisition process, the target curve is also completed when the acquisition is completed, the accurate target curve can be obtained in a real-time acquisition mode, the combustion characteristic value obtained according to the target curve is more accurate, and the combustion characteristic value is matched with the real running state in the cylinder.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a method and a system for detecting the in-cylinder pressure of an engine.
Background
The engine is limited by the fact that the number of internal structures is large and the internal structures are mutually related, and in addition, under the condition of extremely severe working conditions, the probability of failure is relatively large.
The combustion state in an engine cylinder can directly reflect the working condition in the engine cylinder, most of the existing schemes adopt a prediction simulation mode to predict the combustion state in the cylinder, namely, a predicted in-cylinder pressure curve is obtained in advance, then a real in-cylinder pressure curve is obtained by detecting the comparison between actual characteristic values in one or more cylinders and the pressure curve, and further a combustion characteristic value is obtained.
Disclosure of Invention
The invention aims to provide a method for detecting the in-cylinder pressure of an engine, which can solve the technical problems that the precision of the detection data of the in-cylinder pressure is low and the running state in the cylinder cannot be truly reflected in real time in the prior art.
In a first aspect, the present invention provides a method for detecting an in-cylinder pressure of an engine, including: synchronously collecting cylinder pressure signals of all channels;
carrying out range conversion on the cylinder pressure signals of each channel to obtain an actual cylinder pressure value of each channel;
and calculating a plurality of actual cylinder pressure values to obtain a target curve, and determining an in-cylinder pressure combustion characteristic value according to the target curve.
In one embodiment, when synchronously acquiring the cylinder pressure signals of the channels, the method further includes:
synchronously acquiring a corner signal; the corner signals comprise pulse signals and key phase signals, and cylinder pressure signal cycle start marks and cycle end marks of each channel are obtained according to the number of points, the angular resolution and the cylinder pressure intercepting offset angle acquired by the currently identified key phase signals.
In one embodiment, the target curves include a cylinder pressure curve, a heat release rate curve, and a pressure rise rate curve.
In one embodiment, said obtaining a target curve by calculating a plurality of said actual cylinder pressure values includes:
when the cylinder pressure curve is obtained, synchronously calculating the maximum pressure and recording the position of the maximum pressure; synchronously calculating the heat release rate and recording the accumulated heat release when the heat release rate curve is obtained; and when the pressure rise rate curve is obtained, synchronously calculating the maximum pressure rise rate and recording the position of the maximum pressure rise rate.
In one embodiment, the combustion characteristic value includes: the maximum detonation pressure phase, the maximum pressure rise rate phase, a combustion starting point, a combustion center and a combustion finishing point; wherein the content of the first and second substances,
and after the circulation end mark of each channel is recognized, determining the maximum detonation pressure phase according to the recorded maximum detonation pressure position, determining the maximum pressure rise rate phase according to the recorded pressure rise rate position, and obtaining the combustion starting point, the combustion center and the combustion end point according to the heat release rate curve and the pressure rise rate curve.
In one embodiment, after determining the in-cylinder pressure combustion characteristic value according to the target curve, the method further includes:
the combustion characteristic value is output to an external reference.
In a second aspect, the present invention provides an in-cylinder pressure detection system for an engine, comprising:
the acquisition module is used for synchronously acquiring cylinder pressure signals of all channels;
the conversion module is used for carrying out range conversion and processing on the cylinder pressure signals of all the channels to obtain actual cylinder pressure values of all the channels;
and the calculation module is used for calculating a plurality of actual cylinder pressure values to obtain a target curve and determining an in-cylinder pressure combustion characteristic value according to the target curve.
In one embodiment, the combustion control system further comprises an output module for outputting the combustion characteristic value to an external reference.
In a third aspect, the present invention provides an electronic device comprising: a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions when executed by the processor implementing the steps of the engine in-cylinder pressure detection method as described above.
In a fourth aspect, the present invention provides a readable storage medium comprising: the readable storage medium stores thereon a program or instructions that, when executed by a processor, implement the steps of the engine in-cylinder pressure detection method as described above.
By adopting the method for detecting the pressure in the cylinder of the engine, the cylinder pressure signals of all channels can be synchronously acquired, the target curve is synchronously acquired along with the acquisition process, the target curve is also completed when the acquisition is completed, the accurate target curve can be obtained in a real-time acquisition mode, the combustion characteristic value obtained according to the target curve is more accurate, and the combustion characteristic value is matched with the real running state in the cylinder.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of an exemplary engine in-cylinder pressure detection method according to the present disclosure;
FIG. 2 is a schematic illustration of an exemplary engine in-cylinder pressure detection system according to the present disclosure;
fig. 3 is a schematic structural diagram of the electronic device of the present invention.
Detailed Description
The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth further details for the purpose of providing a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than those described herein, and it will be readily apparent to those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or scope of the invention.
Referring to fig. 1, the engine in-cylinder pressure detection method includes:
and S110, synchronously acquiring cylinder pressure signals of all channels.
One channel for each cylinder of the engine, and the engine comprises 20 channels corresponding to cylinder pressure signals comprising 20 cylinders. The invention can realize the collection of each cylinder in each cycle, and the collected data is associated with the real running state in the cylinder, thereby having higher accuracy.
In one embodiment, when synchronously acquiring the cylinder pressure signals of all the channels, synchronously acquiring a rotation angle signal is further included. The corner signals comprise pulse signals and key phase signals, and cylinder pressure signal circulation starting marks and circulation ending marks of all channels are obtained according to the number of points collected by the identified key phase signals, the angular resolution and the cylinder pressure intercepting offset angle.
The collection of cylinder pressure signals and the collection of corner signals are carried out synchronously, the number of points collected by currently identified key phase signals is recorded, and then the angular resolution and the cylinder pressure intercepting offset angle are combined so as to mark the cycle start identification and the cycle end identification of each cylinder pressure signal, so that the collection and the analysis of data in each cycle are realized. And S120, performing range conversion and processing on the cylinder pressure signals of each channel to obtain the actual cylinder pressure value of each channel.
Each channel outputs one datum and corresponds to one cylinder pressure physical quantity signal, and the collected cylinder pressure physical quantity signals are current communication signals, but the collected cylinder pressure physical quantity signals are not limited to the current communication signals and can also be voltage signals or optical signals as long as the signals can be transmitted. After the current communication signal is received, the current communication signal needs to be subjected to range conversion, and the current physical quantity signal is converted to an engineering point value. After the engineering point value is obtained, the cylinder pressure value after the baseline correction is obtained according to the baseline correction algorithm, and the actual cylinder pressure value corresponds to the real cylinder pressure value at the current time point.
In each circulation process of each cylinder, the output of the cylinder pressure value is synchronous with the circulation, so that the change process of the cylinder pressure value is also collected, the operation state in the cylinder is reflected in real time, the collected data is more related to the real operation state in the cylinder, and the fitting degree is higher.
S130, calculating a plurality of actual cylinder pressure values to obtain a target curve, and determining an in-cylinder pressure combustion characteristic value according to the target curve.
In one embodiment, the target curves include a cylinder pressure curve, a heat release rate curve, and a pressure rise rate curve.
Synchronously calculating the maximum pressure and recording the position of the maximum pressure when acquiring the cylinder pressure curve; when a heat release rate curve is obtained, synchronously calculating the heat release rate and recording the accumulated heat release amount; and when the pressure rise rate curve is obtained, synchronously calculating the maximum pressure rise rate and recording the position of the maximum pressure rise rate.
The generation of the cylinder pressure curve, the heat release rate curve and the pressure rise rate curve is synchronous with the cycle process, the generation of the cylinder pressure curve, the heat release rate curve and the pressure rise rate curve is also synchronous with the completion of the cycle in the cylinder, so that the acquisition of the maximum pressure, the maximum pressure position, the heat release rate, the accumulated heat release amount, the maximum pressure rise rate and the position of the maximum pressure rise rate corresponds to the actual state in the cylinder, the target curve can reflect the real combustion state in the cylinder, and the accuracy of the obtained data is higher.
The combustion characteristic values comprise a maximum detonation pressure phase, a maximum pressure rise rate phase, a combustion starting point, a combustion center and a combustion terminal point; after the circulation end marks of all the channels are identified, the maximum detonation pressure phase is determined according to the recorded maximum detonation pressure position, the maximum pressure rise rate phase is determined according to the recorded pressure rise rate position, and the combustion starting point, the combustion center and the combustion end point are obtained according to the heat release rate curve and the pressure rise rate curve.
Because the cylinder pressure curve, the heat release rate curve and the pressure rise rate curve are synchronously carried out along with the circulation in the cylinder, the obtained target curve is more consistent with the combustion state in the cylinder, and the acquisition of the characteristic value is more accurate.
The method further comprises outputting the combustion characteristic to an external reference after determining the pressure combustion characteristic value. The external reference corresponds to a third party system, a client system, etc., and is not limited herein.
In one embodiment, the engine in-cylinder pressure detection system may be in communication connection with the ARM unit through an AXI, data obtained by the engine in-cylinder pressure detection system may be sent to the ARM unit through an AXI bus, and the sending is performed in this cycle until the cylinder cycle end identifier is identified, and the sending method is repeated in the next cycle.
The data sent to the ARM is a combustion characteristic value, and the combustion characteristic value comprises a maximum detonation pressure phase, a maximum pressure rise rate phase, a combustion starting point, a combustion center and a combustion ending point; after the circulation end marks of all the channels are identified, the maximum detonation pressure phase is determined according to the recorded maximum detonation pressure position, the maximum pressure rise rate phase is determined according to the recorded pressure rise rate position, and the combustion starting point, the combustion center and the combustion end point are obtained according to the heat release rate curve and the pressure rise rate curve.
The ARM unit comprises a CAN communication subunit, a TCP/IP communication subunit and a data storage subunit. The CAN communication subunit is used for sending the circulating combustion characteristic value of any cylinder to a third-party system according to a CAN communication protocol after the ARM end finishes reading the circulating combustion characteristic value of the cylinder and before the next cylinder interrupt signal is generated, and the communication mode is not limited to CAN communication.
The TCP/IP communication is used for sending the cylinder target curve and the combustion characteristic value to a client according to a TCP/IP communication protocol after the ARM end finishes reading any cylinder circulation target curve and the combustion characteristic value and before a next cylinder interrupt signal is generated, and meanwhile, the ARM end receives configuration parameters from the client through the TCP/IP communication so as to enable the engine in-cylinder pressure detection system to be in communication connection with the client.
And the data storage subunit is used for storing the target curve and the combustion characteristic value of any cylinder into the memory card for subsequent fault analysis after the target curve and the combustion characteristic value of any cylinder are read and before the interrupt signal of the next cylinder is generated.
In one embodiment, in order to ensure data processing and real-time communication, the ARM unit adopts a dual-core operation mode, and performs AXI data communication, characteristic values and a small part of calculation functions in the CPU1, and performs CAN communication and TCP/IP communication functions in the CPU 2. In other embodiments, the ARM unit is not limited to dual-core operation, and task allocation in each core may be performed in other manners, which is not limited herein.
In one embodiment, the invention can realize the acquisition of cylinder pressure curve, heat release rate curve, pressure rise rate curve and pressure rise rate curve data of each cylinder within 2.4ms at the rotating speed of 2500rpm, and the computer communication display, and simultaneously acquire the combustion characteristic parameters such as detonation pressure position, detonation pressure phase, maximum pressure rise rate, heat release rate point, effective pressure, cycle variation, non-uniformity of each cylinder, and the like, thereby realizing the acquisition and combustion analysis of the in-cylinder pressure of each cylinder per cycle under the rotating speed of 2500rpm of a 20-cylinder engine, wherein the acquired data is more consistent with the in-cylinder combustion state, and the data precision is higher.
Referring to fig. 2, the invention further provides an engine in-cylinder pressure detection system, which includes an acquisition module, a conversion module and a calculation module, wherein the acquisition module acquires cylinder pressure signals of each channel synchronously; the conversion module performs range conversion and processing on the cylinder pressure signals of each channel to obtain the actual cylinder pressure value of each channel; the calculation module calculates a plurality of actual cylinder pressure values to obtain a target curve, and determines an in-cylinder pressure combustion characteristic value according to the target curve.
An output module is further included for outputting the combustion characteristic value to an external reference.
In one embodiment, the acquisition module sends the acquired cylinder pressure signals of each channel to the conversion module, the conversion module processes the cylinder pressure signals to obtain an actual cylinder pressure value, the actual cylinder pressure value is processed by the calculation module to obtain a target curve, and the in-cylinder pressure combustion value is determined according to the target curve.
The acquisition module acquires current signals, the conversion module is used for receiving acquired cylinder pressure physical quantity signals, converting the physical quantity signals to engineering values according to the conversion relation between physical points and engineering point ranges, filtering the in-cylinder engineering values according to a filtering algorithm to acquire filtered cylinder pressure values, the filtered cylinder pressure values correspond to real in-cylinder pressure values, the acquired signals and the acquired cylinder pressure values correspond to real-time in-cylinder combustion states, and deviation generated by model matching in the prior art is eliminated.
The calculation module comprises a plurality of curve calculation subunits, each in-cylinder channel corresponds to one curve calculation subunit, after each channel of each cylinder outputs one actual cylinder pressure value, each cylinder curve calculation subunit synchronously performs cylinder pressure curve calculation, heat release rate curve calculation and pressure rise rate curve calculation on the newly received cylinder pressure value, and three curve points of cylinder pressure, heat release rate and pressure rise rate are output in each calculation clock, so that synchronous output of the curve subunits and the conversion module is ensured. When a cylinder pressure curve point is obtained, synchronously calculating the maximum pressure and recording the position of the maximum pressure; when a heat release rate curve is obtained, synchronously calculating the heat release rate and recording the accumulated heat release amount; and when the pressure rise rate curve is obtained, synchronously calculating the maximum pressure rise rate and recording the position of the maximum pressure rise rate.
In one embodiment, the engine in-cylinder pressure detection system may be in communication connection with the ARM unit through an AXI, data obtained by the engine in-cylinder pressure detection system may be sent to the ARM unit through an AXI bus, and the sending is performed in this cycle until the cylinder cycle end identifier is identified, and the sending method is repeated in the next cycle.
The data sent to the ARM is a combustion characteristic value, and the combustion characteristic value comprises a maximum detonation pressure phase, a maximum pressure rise rate phase, a combustion starting point, a combustion center and a combustion ending point; after the circulation end marks of all the channels are identified, the maximum detonation pressure phase is determined according to the recorded maximum detonation pressure position, the maximum pressure rise rate phase is determined according to the recorded pressure rise rate position, and the combustion starting point, the combustion center and the combustion end point are obtained according to the heat release rate curve and the pressure rise rate curve.
The ARM unit comprises a CAN communication subunit, a TCP/IP communication subunit and a data storage subunit. The CAN communication subunit is used for sending the circulating combustion characteristic value of any cylinder to a third-party system according to a CAN communication protocol after the ARM end finishes reading the circulating combustion characteristic value of the cylinder and before the next cylinder interrupt signal is generated, and the communication mode is not limited to CAN communication.
The TCP/IP communication is used for sending the cylinder target curve and the combustion characteristic value to the client according to a TCP/IP communication protocol after the ARM end finishes reading any cylinder circulation target curve and the combustion characteristic value and before a next cylinder interrupt signal is generated, and meanwhile, the ARM end receives configuration parameters from the client through the TCP/IP communication so as to enable the engine in-cylinder pressure detection system to be in communication connection with the client.
And the data storage subunit is used for storing the target curve and the combustion characteristic value of any cylinder into the memory card after reading and before generating the interrupt signal of the next cylinder for subsequent fault analysis.
In one embodiment, in order to ensure data processing and real-time communication, the ARM unit adopts a dual-core operation mode, and performs AXI data communication, characteristic values and a small part of calculation functions in the CPU1, and performs CAN communication and TCP/IP communication functions in the CPU 2. In other embodiments, the ARM unit is not limited to dual-core operation, and task allocation in each core may be performed in other manners, which is not limited herein.
Referring to fig. 3, the present invention further provides an electronic device 900, which includes a processor 901 and a memory 902, where the memory 902 stores a program or an instruction that can be executed on the processor 901, and the program or the instruction, when executed by the processor 901, implements the steps of the method for detecting an in-cylinder pressure of an engine as described above, and achieves the same technical effects, and in order to avoid repetition, details are not repeated here.
Aspects of the present application may be embodied entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or in a combination of hardware and software. The above hardware or software may be referred to as "data block," module, "" engine, "" unit, "" component, "or" system. The processor may be one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital signal processing devices (DAPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or a combination thereof. Furthermore, aspects of the present application may be represented as a computer product, including computer readable program code, embodied in one or more computer readable media.
The invention also provides a readable storage medium on which a program or instructions are stored, which when executed by a processor implement the steps of the engine in-cylinder pressure detection method as described above.
For example, computer-readable media can include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips … …), optical disks (e.g., compact Disk (CD), digital Versatile Disk (DVD) … …), smart cards, and flash memory devices (e.g., card, stick, key drive … …). The computer readable medium may comprise a propagated data signal with the computer program code embodied therein, for example, on a baseband or as part of a carrier wave. The propagated signal may take any of a variety of forms, including electromagnetic, optical, and the like, or any suitable combination. The computer readable medium can be any computer readable medium that can communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or device. Program code on a computer readable medium may be propagated over any suitable medium, including radio, electrical cable, fiber optic cable, radio frequency signals, or the like, or any combination of the preceding.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.
Claims (10)
1. An engine in-cylinder pressure detection method characterized by comprising:
synchronously collecting cylinder pressure signals of all channels;
carrying out range conversion and processing on the cylinder pressure signals of each channel to obtain an actual cylinder pressure value of each channel;
and calculating a plurality of actual cylinder pressure values to obtain a target curve, and determining an in-cylinder pressure combustion characteristic value according to the target curve.
2. The method for detecting the in-cylinder pressure of the engine according to claim 1, wherein the step of synchronously acquiring the cylinder pressure signals of the channels further comprises:
synchronously acquiring a corner signal; the corner signals comprise pulse signals and key phase signals, and cylinder pressure signal cycle start marks and cycle end marks of each channel are obtained according to the number of points, the angular resolution and the cylinder pressure intercepting offset angle acquired by the currently identified key phase signals.
3. The engine in-cylinder pressure detection method according to claim 1, characterized in that the target curve includes a cylinder pressure curve, a heat release rate curve, and a pressure rise rate curve.
4. The in-cylinder pressure detection method according to claim 3, wherein said obtaining a target curve by calculating a plurality of said actual cylinder pressure values includes:
synchronously calculating the maximum pressure and recording the position of the maximum pressure when the cylinder pressure curve is obtained; synchronously calculating the heat release rate and recording the accumulated heat release when the heat release rate curve is obtained; and when the pressure rise rate curve is obtained, synchronously calculating the maximum pressure rise rate and recording the position of the maximum pressure rise rate.
5. The engine in-cylinder pressure detection method according to claim 3, characterized in that the combustion characteristic value includes: the maximum detonation pressure phase, the maximum pressure rise rate phase, a combustion starting point, a combustion center and a combustion finishing point; wherein the content of the first and second substances,
and after the circulation end mark of each channel is recognized, determining the maximum detonation pressure phase according to the recorded maximum detonation pressure position, determining the maximum pressure rise rate phase according to the recorded pressure rise rate position, and obtaining the combustion starting point, the combustion center and the combustion end point according to the heat release rate curve and the pressure rise rate curve.
6. The method of detecting an in-cylinder pressure of an engine according to claim 1, wherein said determining an in-cylinder pressure combustion characteristic value based on the target curve further comprises:
the combustion characteristic value is output to an external reference.
7. An engine in-cylinder pressure detection system, comprising:
the acquisition module is used for synchronously acquiring cylinder pressure signals of all channels;
the conversion module is used for carrying out range conversion and processing on the cylinder pressure signals of all the channels to obtain actual cylinder pressure values of all the channels;
and the calculation module is used for calculating a plurality of actual cylinder pressure values to obtain a target curve and determining an in-cylinder pressure combustion characteristic value according to the target curve.
8. The engine in-cylinder pressure detection system of claim 7, further comprising an output module for outputting the combustion characteristic value to an external reference.
9. An electronic device, comprising: a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions when executed by the processor implementing the steps of the engine in-cylinder pressure detection method of any one of claims 1 to 6.
10. A readable storage medium, characterized in that a program or instructions are stored thereon, which program or instructions, when executed by a processor, carry out the steps of the engine in-cylinder pressure detection method according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211584419.7A CN115750086A (en) | 2022-12-09 | 2022-12-09 | Engine in-cylinder pressure detection method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211584419.7A CN115750086A (en) | 2022-12-09 | 2022-12-09 | Engine in-cylinder pressure detection method and system |
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| CN115750086A true CN115750086A (en) | 2023-03-07 |
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| CN202211584419.7A Pending CN115750086A (en) | 2022-12-09 | 2022-12-09 | Engine in-cylinder pressure detection method and system |
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