CN115045758A - Monitoring system and monitoring method - Google Patents
Monitoring system and monitoring method Download PDFInfo
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- CN115045758A CN115045758A CN202210687196.0A CN202210687196A CN115045758A CN 115045758 A CN115045758 A CN 115045758A CN 202210687196 A CN202210687196 A CN 202210687196A CN 115045758 A CN115045758 A CN 115045758A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002912 waste gas Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 54
- 238000001228 spectrum Methods 0.000 claims description 43
- 239000000203 mixture Substances 0.000 claims description 22
- 239000000446 fuel Substances 0.000 claims description 9
- 238000010183 spectrum analysis Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
- F02B77/086—Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses a monitoring system and a monitoring method, which are used for reducing the influence of road conditions on detection results and improving the accuracy of engine fire monitoring. The application includes: the device comprises a cylinder, a cooler and a pulse signal collector; the cylinder is provided with a feeding hole and an exhaust hole, the feeding hole is connected with the exhaust hole through a circulating pipe, and the circulating pipe is used for conveying the waste gas exhausted by the exhaust hole to the feeding hole; the cooler is arranged on the circulating pipe and used for cooling the waste gas; the pulse signal collector is arranged on the circulating pipe and used for collecting pulse signals in the circulating pipe and sending the pulse signals to the ECU controller.
Description
Technical Field
The application relates to the technical field of engines, in particular to a monitoring system and a monitoring method.
Background
The engine fire refers to that one or more cylinders of the engine do not work or do not work enough, namely the engine lacks cylinders and is accompanied with engine shake, the power is insufficient to make the engine not work, the automobile cannot accelerate, the oil consumption is increased without reason, meanwhile, the insufficiently combusted mixed gas is discharged into the post-treatment catalyst along with the tail gas of the engine, the post-treatment catalyst is easy to deteriorate or even damage, the engine emission exceeds the standard, and therefore, the fire condition of the engine needs to be accurately identified.
When monitoring the engine and catching fire among the prior art, through installing bent axle sensor and camshaft revolution speed sensor on engine cylinder, through the sensor to the bent axle of engine and camshaft control, when the rotational speed of bent axle and camshaft is inconsistent with normal rotational speed, judge that the engine is the state of catching fire.
However, the correlation between the change situation of the engine rotation speed and the road condition is large, and the condition of false alarm can be caused by severe change of the engine rotation speed under the bumpy road condition, so that the problem of large diagnosis error exists.
Disclosure of Invention
In order to solve the technical problem, the application provides a monitoring system and a monitoring method, so that the fire monitoring is not affected by road conditions, and the accuracy of the fire monitoring of the engine is improved.
A first aspect of the application provides a monitoring system comprising
The device comprises a cylinder, a cooler and a pulse signal collector; the cylinder is provided with a feeding hole and an exhaust hole, the feeding hole is connected with the exhaust hole through a circulating pipe, and the circulating pipe is used for conveying the waste gas exhausted by the exhaust hole to the feeding hole; the cooler is arranged on the circulating pipe and used for cooling the waste gas; the pulse signal collector is arranged on the circulating pipe and used for collecting pulse signals in the circulating pipe and sending the pulse signals to the ECU controller.
Optionally, an EGR valve is further disposed on the circulation pipe, the EGR valve is located between the pulse signal collector and the feed port, and the EGR valve is used for controlling the flow rate of the exhaust gas in the circulation pipe.
Optionally, the cooler and the circulating pipe are hermetically connected in a detachable manner.
Optionally, an oil-gas mixing assembly is connected to the feed port, the oil-gas mixing assembly is connected to the circulation pipe, and the oil-gas mixing assembly is used for providing an oil-gas mixture to the cylinder.
Optionally, an air inlet pipe is arranged on the oil-gas mixing component and used for conveying air, a throttle valve is arranged on the air inlet pipe and used for controlling the air flow of the air inlet pipe.
Optionally, a spark plug and an ignition coil are arranged in the cylinder, and the spark plug and the ignition coil are matched to ignite the oil-gas mixture in the cylinder.
Optionally, the ignition coil is an open magnetic ignition coil, a closed magnetic ignition coil or an ion flow ignition coil.
A second aspect of the present application provides a monitoring method, including:
collecting pulse signals in the circulating pipe through a pulse signal collector;
acquiring a phase signal of an engine;
performing spectrum analysis on the pulse signal and the phase signal to obtain real-time spectrum data;
acquiring operation information of the engine, and determining standard frequency spectrum data according to the operation information;
and judging whether the real-time frequency spectrum data is matched with the standard frequency spectrum data, if not, determining that the engine is in a fire state, and controlling the engine to enter a protection mode.
Optionally, the obtaining the operation information of the engine at the current time includes:
and acquiring the real-time rotating speed and the real-time torque of the engine at the current moment.
Optionally, after the controlling the engine to enter the protection mode, the monitoring method further includes:
and determining a target cylinder which is misfiring in the engine according to the pulse signal and the volume of the circulating pipe, accumulating the misfire frequency of the target cylinder, and calculating the misfire rate of the target cylinder according to the misfire frequency.
According to the technical scheme, the method has the following effects:
the circulating pipe is connected to a feed hole and an exhaust hole of the cylinder, the circulating pipe enables exhaust gas on the exhaust hole to flow to the feed hole again, a cooler is arranged on the circulating pipe and used for cooling the exhaust gas, a pulse signal collector is arranged on the circulating pipe between the cooler and the feed hole and used for collecting pulse signals in the circulating pipe and sending the pulse signals to the ECU controller, and therefore the fire condition of the cylinder is monitored.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a monitoring system of the present application;
FIG. 2 is a schematic diagram of a monitoring method of the present application;
fig. 3 is a schematic diagram of an ECU controller according to the present application.
Detailed Description
The application provides a monitoring system and a monitoring method, which are used for reducing the influence of road conditions on fire monitoring and improving the accuracy of the fire monitoring of an engine.
Referring to fig. 1, a monitoring system provided in the present application includes:
the device comprises a cylinder 1, a cooler 2 and a pulse signal collector 3; the cylinder 1 is provided with a feed hole and an exhaust hole, the feed hole is connected with the exhaust hole through a circulating pipe 4, and the circulating pipe 4 is used for transporting waste gas exhausted from the exhaust hole to the feed hole; a cooler 2 is provided on the circulation pipe 4, the cooler 2 being for cooling the exhaust gas; the pulse signal collector 3 is arranged on the circulating pipe 4, and the pulse signal collector 3 is used for collecting the pulse signals in the circulating pipe 4 and sending the pulse signals to the ECU controller 6.
In this application, the quantity of cylinder 1 can be 1, also can be a plurality of, and is practical, when the oil-gas mixture normal combustion in the cylinder 1, the waste gas that produces is regular in circulating pipe 4, so at this moment, the pulse signal that pulse collector 3 gathered also exists regularly, if there is the target cylinder that the oil-gas mixture is incomplete burning, then the pulse signal that pulse signal collector 3 gathered will break the law, from this, just can monitor cylinder 1, judge whether the condition of catching fire takes place for cylinder 1.
It is understood that the pulse signal collector 3 may be a high-speed pressure sensor or a gas flow rate sensor, and in this application, the pulse signal collector 3 is not specifically limited, subject to practical implementation.
When the pulse signal collector 3 is a high-speed pressure sensor, the ECU controller 2 obtains the exhaust gas pressure in the circulating pipe 4, when the engine is running, the combustion of the oil-gas mixture is performed in the cylinder 1, exhaust gas is generated after the combustion, the exhaust gas flows into the circulating pipe 4, when the engine is on fire, conditions such as no ignition, insufficient combustion and the like can be caused, and at the moment, the exhaust gas pressure in the circulating pipe 4 can be correspondingly changed.
In this embodiment, through set up pulse signal collector 3 on circulating pipe 4, pulse signal collector 3 gathers the pulse signal in circulating pipe 4, then ECU controller 5 carries out the analysis to this pulse signal, the effect of the control of catching fire to the cylinder is realized, the condition of catching fire of real time monitoring cylinder 1, it is waste gas that flows in circulating pipe 4, the production of waste gas is irrelevant with the road conditions, therefore, the condition of catching fire of pulse signal monitoring cylinder 1 through circulating pipe 4, can reduce the road conditions to the influence of the control of catching fire, thereby improve the accuracy of the control of catching fire to the engine.
Optionally, an EGR valve 5 is further disposed on the circulation pipe 4, the EGR valve 5 is located between the pulse signal collector 3 and the feed port, and the EGR valve 5 is used for controlling the flow of the exhaust gas in the circulation pipe 4. The EGR valve 5 controls the flow of exhaust gases in the circulation pipe 4 to re-deliver part of the exhaust gases to the cylinder 1 for combustion, and the EGR valve cooperates with the circulation pipe 4 to suppress the generation of nitrogen oxides in the exhaust gases. In the present application, the EGR valve 5 is a physical valve or an electromagnetic valve, and the EGR valve used specifically is used according to actual needs, and is not limited herein.
Optionally, adopt detachable mode sealing connection between cooler 2 and the circulating pipe 4, detachable means, cooler 2 and circulating pipe 4 can be dismantled each other, and when in actual use, connect circulating pipe 4 respectively with the both ends of cooler 2, if cooler 2 takes place to need the maintenance when changing, disassemble cooler 2 from circulating pipe 4 to maintain or change. The sealing connection means that the connection between the cooler 2 and the circulating pipe 4 is sealed and has no gap, and actually, a sealing ring can be arranged at the connection, and the sealing connection between the cooler 2 and the circulating pipe 4 is formed by the sealing ring.
Optionally, an oil-gas mixing assembly is connected to the feed port of the cylinder 1, the oil-gas mixing assembly is connected to the circulation pipe 4, and the oil-gas mixing assembly is used for providing an oil-gas mixture to the cylinder 1. The oil-gas mixing component is connected with the feeding hole, and the circulating pipe 4 is connected with the oil-gas mixing component, so that the waste gas in the circulating pipe 4 firstly reaches the oil-gas mixing component to be mixed with air and fuel oil to form an oil-gas mixture, and then enters the cylinder 1 through the feeding hole to be combusted; the oil-gas mixing component is connected with the fuel system and the air system, the air system conveys air to the oil-gas mixing component, the fuel system conveys fuel oil to the oil-gas mixing component, and the oil-gas mixing component is used for mixing the air and the fuel oil and conveying an oil-gas mixture obtained by mixing to the cylinder 1.
Optionally, an air inlet pipe is arranged on the oil-gas mixing component and used for conveying air, an air throttle 7 is arranged on the air inlet pipe, and the air throttle 7 is used for controlling the air flow of the air inlet pipe. Actually, the air inlet pipe is connected with an air system, and air provided by the air system enters the oil-gas mixing assembly through the air inlet pipe; be provided with throttle valve 7 on the throttle pipe, throttle valve 7 can control the air mass flow in the intake pipe, can adjust the air proportion in the oil-gas mixture, and then adjusts the proportion of the fuel in the oil-gas mixture and air to suitable proportion, can fully burn the oil-gas mixture for the cylinder and facilitate.
Optionally, a spark plug 8 and an ignition coil are arranged in the cylinder 1, and the spark plug 8 and the ignition coil are matched to ignite the oil-gas mixture in the cylinder 1. The combustion of the mixture in the cylinder 1 requires ignition, and in practice, the ignition of the mixture in the cylinder 1 is carried out by using a spark plug 8 in cooperation with an ignition coil.
Optionally, the ignition coil is an open magnetic ignition coil, a closed magnetic ignition coil or an ion flow ignition coil. In practice, the present application does not limit the type of ignition coil, subject to what is actually achievable.
Referring to fig. 2, fig. 2 is a schematic diagram of a monitoring method according to the present application, the monitoring method includes:
101. and the ECU controller collects pulse signals in the circulating pipe through the pulse signal collector.
The ECU controller is a vehicle-mounted controller, the ECU controller is electrically connected with a pulse signal collector, the pulse signal collector is arranged in the circulating pipe, the pulse signal collector acquires a pulse signal in the circulating pipe and transmits the pulse signal to the ECU controller, and the ECU controller acquires the pulse signal at the moment.
It is understood that the pulse signal collector may be a pressure sensor, a speed sensor, etc., and correspondingly, the obtained pulse signal may be exhaust gas pressure data in the circulation pipe, exhaust gas flow rate data in the circulation pipe, etc., which is not limited herein for practical purposes.
102. The ECU controller acquires a phase signal of the engine.
In the present embodiment, the engine is equipped with a phase sensor, and the ECU controller obtains the phase signal of the engine through the phase sensor, the phase sensor is a general term for a camshaft position sensor and a crankshaft position sensor, and the phase sensor can be divided into a magnetoelectric type and a hall type.
103. And the ECU controller performs spectrum analysis on the pulse signal and the phase signal to obtain real-time spectrum data.
After the ECU controller acquires the pulse signal and the phase signal of the engine, the ECU controller performs spectrum analysis on the two signals to obtain real-time spectrum data. The real-time spectral data represents a combination of real-time exhaust data and real-time phase data generated by the engine during operation.
The ECU controller combines the spectrogram of the pulse signal and the phase signal to form real-time frequency spectrum data, and the real-time frequency spectrum data is displayed in the form of a waveform diagram.
104. The ECU controller acquires operation information of the engine and determines standard frequency spectrum data according to the operation information.
When the engine normally runs, the engine can generate standard frequency spectrum data. Normal engine operation may refer to operation of the engine in which the cylinders are not experiencing a misfire condition. In the present application, the standard spectrum data is determined by the rotational speed and torque of the engine, and the determination process is described in detail as follows:
optionally, the ECU controller obtains a real-time rotation speed and a real-time torque of the engine, where the real-time rotation speed and the real-time torque represent a rotation speed and a torque at a time corresponding to the real-time frequency spectrum data, and the engine has a standard frequency spectrum data in each rotation speed and torque, and after the ECU controller obtains the real-time rotation speed and the real-time torque of the engine, the ECU controller queries the corresponding standard frequency spectrum data according to the real-time rotation speed and the real-time torque.
105. And the ECU controller judges whether the real-time frequency spectrum data is matched with the standard frequency spectrum data, if not, the engine is determined to be in a fire state, and the engine is controlled to enter a protection mode.
After acquiring the real-time frequency spectrum data and the standard frequency spectrum data, the ECU controller compares the real-time frequency spectrum data and the standard frequency spectrum data and compares whether the real-time frequency spectrum data and the standard frequency spectrum data are matched; the standard frequency spectrum data represent frequency spectrum data which are generated by the engine under the real-time rotating speed and the real-time torque, the real-time frequency spectrum data represent frequency spectrum data obtained through real-time pulse signals, and if the real-time frequency spectrum data are matched with the standard frequency spectrum data, the engine is not abnormal and the fire condition is not generated; if the real-time exhaust gas data and the standard frequency spectrum data are not matched, the standard pulse signal generated by the real-time rotating speed and the real-time torque is not consistent with the pulse signal acquired in real time, and the condition that a cylinder in an engine catches fire is indicated, so that the real-time exhaust gas data can be deviated, and the real-time frequency spectrum data is not matched with the standard frequency spectrum data. For example: when the real-time rotating speed and the real-time torque are both 1, the standard pulse signal which is to be generated is 2, and the pulse signal which is acquired by the pulse signal acquisition device is 3, so that the real-time pulse signal is inconsistent with the standard pulse signal, and the condition that a cylinder of the engine catches fire is indicated.
The ECU controller controls the engine to enter a protection mode for protecting the engine from damage caused by continuous high-load operation of the engine after a cylinder misfire after it is determined that the engine has misfired, thereby preventing the vehicle from being damaged. The protected mode may be a transmission gear limit, engine derating, etc. In addition, when the engine is controlled to enter the protection mode, the ECU controller can also control an alarm in the vehicle to give an alarm so as to prompt the driver.
In the embodiment, the ECU controller obtains real-time frequency spectrum data of the engine through the pulse signals and the phase signals, then determines standard frequency spectrum data of the engine according to the real-time rotating speed and the real-time torque of the engine, compares the matching conditions of the real-time frequency spectrum data and the standard frequency spectrum data, if the matching conditions are not matched, the engine is in fire catching, and controls the engine to enter a protection mode, so that the fire catching condition of the engine is monitored and only related to the pulse signals in the circulating pipe of the engine, the monitoring data are not influenced by road conditions, and the fire catching monitoring accuracy can be improved; in addition, the fire monitoring is not required to be carried out through the ion current ignition coil, and the cost of using the ion current ignition coil is reduced.
Optionally, in the present application, the following steps are further included:
the ECU controller determines a target cylinder in the engine, which is misfiring, based on the pulse signal and the volume of the circulation tube, accumulates the misfire frequency of the target cylinder, and calculates the misfire rate of the target cylinder from the misfire frequency.
The engine can be a single cylinder or a plurality of cylinders, in the plurality of cylinders, when the ECU controller judges that the engine is on fire, the ECU controller can further judge which cylinder in the engine is on fire, at the moment, the ECU controller determines the target cylinder on fire according to the pulse signal and the volume in the circulating pipe, in detail, when the pulse signal is exhaust gas pressure, the ECU controller calculates the flow rate of the exhaust gas through the exhaust gas pressure value and the volume of the circulating pipe, and the target cylinder on fire is determined through the flow rate of the exhaust gas.
After the ECU controller determines a target cylinder where misfire occurs, the ECU controller accumulates the misfire frequency of the target cylinder and calculates a misfire rate according to the misfire frequency, and the condition of the target cylinder can be known from the misfire rate. And when the misfire rate reaches a preset value, the maintenance personnel continuously maintain or replace the target cylinder.
With continuing reference to fig. 3, fig. 3 is a schematic diagram of an ECU controller according to the present application, the ECU controller comprising:
the acquisition unit 201 is used for acquiring the pulse signals in the circulating pipe through the pulse signal acquisition device;
an acquisition unit 202 for acquiring a phase signal of the engine;
the analysis unit 203 is configured to perform spectrum analysis on the pulse signal and the phase signal to obtain real-time spectrum data;
the first processing unit 204 is configured to obtain operation information of the engine, and determine standard frequency spectrum data according to the operation information;
and the judging unit 205 is configured to judge whether the real-time spectrum data matches the standard spectrum data, and if not, determine that the engine is in a misfire state, and control the engine to enter a protection mode.
A second processing unit 206, configured to determine a target cylinder in the engine which is misfiring according to the pulse signal and the volume of the circulation pipe, accumulate a misfire frequency of the target cylinder, and calculate a misfire rate of the target cylinder according to the misfire frequency;
in this application, the first processing unit 204 includes:
the obtaining module 2041 is configured to obtain a real-time rotation speed and a real-time torque of the engine at a current moment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (10)
1. A monitoring system, comprising:
the device comprises a cylinder, a cooler and a pulse signal collector;
the cylinder is provided with a feed hole and an exhaust hole, the feed hole is connected with the exhaust hole through a circulating pipe, and the circulating pipe is used for conveying the waste gas exhausted by the exhaust hole to the feed hole;
the cooler is arranged on the circulating pipe and used for cooling the waste gas;
the pulse signal collector is arranged on the circulating pipe and used for collecting pulse signals in the circulating pipe and sending the pulse signals to the ECU controller.
2. The monitoring system according to claim 1, wherein the circulation pipe is further provided with an EGR valve, the EGR valve being located between the pulse signal collector and the feed hole, the EGR valve being configured to control a flow rate of the exhaust gas in the circulation pipe.
3. A monitoring system according to claim 1 or 2, characterised in that the cooler is sealingly connected to the circulation tube in a detachable manner.
4. A monitoring system according to claim 1 or 2, characterised in that an air-fuel mixture module is connected to the inlet opening, the air-fuel mixture module being connected to the circulation duct, the air-fuel mixture module being adapted to supply an air-fuel mixture to the cylinder.
5. The monitoring system of claim 4, wherein the air-fuel mixture component is provided with an air intake pipe for delivering air, and wherein the air intake pipe is provided with a throttle valve for controlling the air flow of the air intake pipe.
6. A monitoring system according to claim 1 or 2, characterised in that a spark plug and an ignition coil are arranged in the cylinder, which spark plug cooperates with the ignition coil to ignite the air-fuel mixture in the cylinder.
7. The monitoring system of claim 6, wherein the ignition coil is an open magnetic ignition coil, a closed magnetic ignition coil, or an ion flow ignition coil.
8. A method of monitoring, comprising:
collecting pulse signals in the circulating pipe through a pulse signal collector;
acquiring a phase signal of an engine;
performing spectrum analysis on the pulse signal and the phase signal to obtain real-time spectrum data;
acquiring operation information of the engine, and determining standard frequency spectrum data according to the operation information;
and judging whether the real-time frequency spectrum data is matched with the standard frequency spectrum data, if not, determining that the engine is in a fire state, and controlling the engine to enter a protection mode.
9. The monitoring method according to claim 8, wherein the acquiring the operation information of the engine at the present time includes:
and acquiring the real-time rotating speed and the real-time torque of the engine at the current moment.
10. The monitoring method according to claim 8, wherein after the controlling the engine to enter a protected mode, the monitoring method further comprises:
and determining a target cylinder which is misfiring in the engine according to the pulse signal and the volume of the circulating pipe, accumulating the misfire frequency of the target cylinder, and calculating the misfire rate of the target cylinder according to the misfire frequency.
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