CN112284745B - Waveform detection method for accidental shaking or accidental fire of engine - Google Patents
Waveform detection method for accidental shaking or accidental fire of engine Download PDFInfo
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- CN112284745B CN112284745B CN202011076789.0A CN202011076789A CN112284745B CN 112284745 B CN112284745 B CN 112284745B CN 202011076789 A CN202011076789 A CN 202011076789A CN 112284745 B CN112284745 B CN 112284745B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention belongs to the technical field of engine detection, in particular to a waveform detection method for accidental shaking or accidental fire of an engine, which comprises the following steps: s1, collecting gas fluctuation data at an outlet of an exhaust pipe and vibration parameters at an outlet end of the exhaust pipe; s2, converting the collected gas fluctuation data and vibration parameters into electric signals required by output and respectively transmitting the electric signals to an oscilloscope, and obtaining a gas pressure carrier and a vibration carrier by adopting a common modulation signal; s3, comparing the gas pressure carrier waveform with the vibration carrier waveform; s4, judging that the cylinder works badly when the gas pressure carrier waveform and the vibration carrier waveform both have unbalanced waveforms in the same time; and S5, collecting an ignition trigger signal of the cylinder. The dual-couple shake detection mode integrating tail gas pulsation detection and tail end vibration detection of the exhaust pipe is adopted, the misfiring cylinder can be judged quickly and accurately, and accordingly targeted inspection is conducted, and the dual-couple shake detection device has the advantages of being low in cost, free of disassembly, convenient to use, quick and accurate.
Description
Technical Field
The invention relates to the technical field of engine detection, in particular to a waveform detection method for accidental shaking or accidental fire of an engine.
Background
According to the working principle of the engine, the factors influencing the working performance of the engine are more, and the engine mainly comprises three aspects of the mechanical performance of the engine, an electronic control system and the working environment of the engine. The mechanical properties of the engine mainly comprise a fuel intake and exhaust control system, a fuel compression and combustion environment, the matching performance among moving parts and the like; the electronic control system mainly comprises a power supply system, an electronic control module, a sensor, an actuator, an electric circuit and the like; the working environment of the engine mainly comprises geographical environment, use environment and other factors.
For the engine which occasionally shakes once, the computer PCM of the engine cannot report a misfire fault due to one-time poor work. Because the monitoring logic of the misfire fault reports the fault after more than 30 times of accumulated working faults exist in 100 revolutions, if the PCM does not report the fault code, the diagnosis instrument cannot be used for diagnosing the jitter, which causes great difficulty for fault diagnosis, and if the fact that the jitter is caused by which cylinder works poorly is not known, the fault can not be accurately checked.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for detecting the waveform of the accidental shaking or accidental fire of the engine, which solves the problems that the misfiring cylinder cannot be judged quickly and accurately and the means for detecting the accidental faults of the engine are lacked in the conventional method for detecting the accidental shaking of the engine.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a method for detecting the waveform of accidental shaking or accidental fire of an engine comprises the following steps:
s1, collecting gas fluctuation data at an outlet of an exhaust pipe and vibration parameters at the outlet end of the exhaust pipe;
s2, converting the collected gas fluctuation data and vibration parameters into electric signals required by output and respectively transmitting the electric signals to an oscilloscope, and obtaining a gas pressure carrier and a vibration carrier by adopting a common modulation signal;
s3, comparing the gas pressure carrier waveform with the vibration carrier waveform;
s4, judging that the cylinder works badly when the gas pressure carrier waveform and the vibration carrier waveform both have unbalanced waveforms in the same time;
s5, collecting an ignition trigger signal of the cylinder;
and S6, respectively transmitting the collected cylinder ignition trigger signals to an oscilloscope to obtain exhaust pressure waveforms, and capturing specific accidental ignition cylinders according to the working stroke and the exhaust stroke of the trigger cylinder.
As a preferred technical solution of the present invention, in S1, the gas fluctuation data at the outlet of the exhaust pipe is collected by a pulsation sensor.
As a preferable technical solution of the present invention, in S1, the vibration parameters at the outlet end of the exhaust pipe are collected by a vibration sensor.
In a preferred embodiment of the present invention, in S5, the cylinder ignition trigger signal is acquired by a COP sensor.
As a preferred technical solution of the present invention, in S6, a specific manner of capturing the accidental fire extinguishing cylinder is: the method comprises the steps that one ignition trigger is used as a working cycle, four strokes of air inlet, compression, work and exhaust are shared, a crankshaft of the working cycle rotates for 2 circles, the crankshaft rotates for 720 degrees crk, each stroke goes through 180 degrees crk, the 180 degrees crk after the ignition trigger is the work stroke, the 180 degrees to 360 degrees are exhaust strokes, and the second exhaust pressure wave after the ignition trigger signal is captured and judged to be caused by the exhaust of an ignition cylinder.
(III) advantageous effects
Compared with the prior art, the invention provides a method for detecting the waveform of accidental shaking or accidental fire of an engine, which has the following beneficial effects:
the waveform detection method for accidental shaking or accidental fire of the engine adopts a double-accidental shaking detection mode integrating tail gas pulsation detection and tail end vibration detection of the exhaust pipe, can quickly and accurately judge the misfiring cylinder, thereby carrying out targeted inspection, and having the advantages of low cost, no disassembly, convenient use and quickness and accuracy.
Drawings
FIG. 1 is a flow chart of a method for detecting the waveform of an engine accidental shake or accidental misfire according to the present invention;
FIG. 2 is a waveform of a gas pressure carrier wave of the present invention;
FIG. 3 is a waveform of vibration carrier waves at the outlet end of the exhaust pipe according to the present invention;
FIG. 4 is a schematic diagram of a comparison of a gas pressure carrier wave and a vibration carrier wave at the outlet end of the exhaust pipe according to the present invention;
FIG. 5 is a waveform of engine exhaust fluctuations in accordance with the present invention;
FIG. 6 is a waveform indicating diagram of an accidental misfire in accordance with the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1-6, the present invention provides the following technical solutions: a method for detecting the waveform of accidental shaking or accidental fire of an engine comprises the following steps:
s1, collecting gas fluctuation data at an outlet of an exhaust pipe and vibration parameters at the outlet end of the exhaust pipe;
s2, converting the acquired gas fluctuation data and vibration parameters into electric signals required by output and respectively transmitting the electric signals to an oscilloscope, and obtaining a gas pressure carrier and a vibration carrier by adopting a common modulation signal;
s3, comparing the gas pressure carrier waveform with the vibration carrier waveform;
s4, judging that the cylinder works badly when the gas pressure carrier waveform and the vibration carrier waveform both have unbalanced waveforms in the same time;
s5, collecting an ignition trigger signal of the cylinder;
and S6, respectively transmitting the collected cylinder ignition trigger signals to an oscilloscope to obtain exhaust pressure waveforms, and capturing specific accidental ignition cylinders according to the working stroke and the exhaust stroke of the trigger cylinder.
Specifically, in S1, the gas fluctuation data at the outlet of the exhaust pipe is collected by a pulsation sensor.
In this embodiment, the pulsation sensor acquires gas fluctuation data at the outlet of the exhaust pipe, converts the data into an electrical signal required for output, transmits the electrical signal to the oscilloscope, displays a gas pressure carrier wave after the processing of the oscilloscope, and when the engine works well, the pressure fluctuation in the exhaust pipe is regular, and when a certain cylinder of the engine works poorly occasionally, the balance of the exhaust fluctuation is broken, as shown in fig. 2, an unbalanced waveform appears on the carrier wave.
Specifically, in S1, the vibration parameters at the outlet end of the exhaust pipe are collected by a vibration sensor.
In this embodiment, the vibration sensor acquires vibration parameters at the outlet end of the exhaust pipe, converts the vibration parameters into electrical signals required by output, transmits the electrical signals to the oscilloscope, and displays vibration carrier waves after the processing of the oscilloscope.
Specifically, in S5, the cylinder ignition trigger signal is acquired by a COP sensor.
Specifically, in S6, the specific manner of capturing the accidental fire extinguishing cylinder is as follows: taking an ignition trigger to a next ignition trigger as a working cycle, wherein four strokes of air intake, compression, work and exhaust are shared, a working cycle crankshaft rotates for 2 circles and goes through 720 degrees of crk, each stroke goes through 180 degrees of crk, the 180 degrees of crk after the ignition trigger is a work stroke, the 180 degrees to 360 degrees of exhaust strokes are exhaust strokes, and a second exhaust pressure wave after the ignition trigger signal is captured and judged to be caused by the exhaust of the ignition cylinder, as shown in fig. 5; in this case, the ignition is triggered to 1 cylinder, and abnormality occurs in that exhaust pressure fluctuation of 3 cylinders, so that it can be quickly judged that 3 cylinders are sporadically misfired as shown in fig. 6.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for detecting the waveform of accidental shaking or accidental fire of an engine is characterized by comprising the following steps: the method comprises the following steps:
s1, collecting gas fluctuation data at an outlet of an exhaust pipe and vibration parameters at the outlet end of the exhaust pipe;
s2, converting the collected gas fluctuation data and vibration parameters into electric signals required by output and respectively transmitting the electric signals to an oscilloscope, and obtaining a gas pressure carrier and a vibration carrier by adopting a common modulation signal;
s3, comparing the gas pressure carrier waveform with the vibration carrier waveform;
s4, judging that the cylinder works badly when the gas pressure carrier waveform and the vibration carrier waveform both have unbalanced waveforms in the same time;
s5, collecting an ignition trigger signal of the cylinder;
s6, respectively transmitting the collected cylinder ignition trigger signals to an oscilloscope to obtain exhaust pressure waveforms, and capturing specific accidental ignition cylinders according to the working stroke and the exhaust stroke of the trigger cylinder;
in S6, the specific accidental fire extinguishing cylinder is captured in the following mode: the method comprises the steps that one ignition trigger is used as a working cycle, four strokes of air inlet, compression, work and exhaust are shared, a crankshaft of the working cycle rotates for 2 circles, the crankshaft rotates for 720 degrees crk, each stroke goes through 180 degrees crk, the 180 degrees crk after the ignition trigger is used as a work stroke, the 180 degrees to 360 degrees are used as exhaust strokes, and the second exhaust pressure wave after the ignition trigger signal is captured and judged to be caused by the exhaust of an ignition cylinder.
2. The method for detecting the waveform of the accidental shake or accidental misfire of the engine as claimed in claim 1, wherein: in the S1, the gas fluctuation data at the outlet of the exhaust pipe is collected through a pulsation sensor.
3. The method for detecting the waveform of the accidental shaking or accidental misfire of the engine as claimed in claim 1, wherein: in S1, vibration parameters of the outlet end of the exhaust pipe are collected through a vibration sensor.
4. The method for detecting the waveform of the accidental shake or accidental misfire of the engine as claimed in claim 1, wherein: in S5, the cylinder ignition trigger signal is acquired through a COP sensor.
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| CN202011076789.0A CN112284745B (en) | 2020-10-10 | 2020-10-10 | Waveform detection method for accidental shaking or accidental fire of engine |
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| CN202011076789.0A CN112284745B (en) | 2020-10-10 | 2020-10-10 | Waveform detection method for accidental shaking or accidental fire of engine |
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| CN112284745B true CN112284745B (en) | 2023-04-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7801671B1 (en) * | 2006-09-05 | 2010-09-21 | Pederson Neal R | Methods and apparatus for detecting misfires |
| CN101251441B (en) * | 2008-03-20 | 2011-03-16 | 桂林电子科技大学 | Method and system for on-line monitoring car engine state |
| CN101907520B (en) * | 2010-07-20 | 2012-07-04 | 浙江吉利汽车研究院有限公司 | Engine fire detection method and detection device thereof |
| CN105606367B (en) * | 2015-11-19 | 2016-08-31 | 中南林业科技大学 | A kind of engine steady operation catches fire detection and self adaptation decision method and device |
| CN110174271A (en) * | 2019-06-03 | 2019-08-27 | 王鹏 | A kind of Diagnosis Method of Diesel Fault and diagnostic system |
| CN210322311U (en) * | 2019-08-23 | 2020-04-14 | 上海晨汐教育科技有限公司 | Detection device for accidental shaking or accidental fire of engine |
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