CN100445542C - Fire detecting method and system of internal combustion engine - Google Patents
Fire detecting method and system of internal combustion engine Download PDFInfo
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- CN100445542C CN100445542C CNB2006101632983A CN200610163298A CN100445542C CN 100445542 C CN100445542 C CN 100445542C CN B2006101632983 A CNB2006101632983 A CN B2006101632983A CN 200610163298 A CN200610163298 A CN 200610163298A CN 100445542 C CN100445542 C CN 100445542C
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Abstract
The present invention belongs to the field of internal combustion engine detecting technology, and is especially internal combustion engine fire detecting method and system. The present invention can detect fire in internal combustion engine accurately without need of excessive sensor. The detecting method includes the following steps: 1. acquiring the signal of wide band oxygen sensor as the detection signal and obtaining fire judging diagnosis data; 2. comparing the obtained diagnosis data with the threshold value to judge fire; and 3. calculating the fire frequency in certain algorithm and outputting alarm signal to the driver in case that the fire frequency is greater than some preset value. The detecting system includes a wide band oxygen sensor for acquiring detecting signal and relevant computer programs.
Description
Technical field:
The invention belongs to Measuring Technology for Internal-Combustion Engine, particularly relate to internal-combustion engine fire detecting method and system.
Background technique:
The method that detects that is used to catch fire mainly is divided three classes: a class is to detect with fluctuation of speed signal, and the operating mode scope that this method adapts to is little, influenced greatly by road roughness, the gravity accleration sensor that needs are extra; Second class is to detect with cylinder pressure sensor, this method degree of accuracy height, but need cylinder pressure sensor, the cost height; The 3rd class is to detect with the pressure surge in the outlet pipe, and this method also needs extra pressure transducer, has increased cost.
At present, using the more method that detects of catching fire in the fault diagnosis system of automobile is to adopt the surge detection of engine crankshaft rotating speed to catch fire.And this method is when high speed, because the rotary inertia of flywheel is big, when catching fire, the fluctuation of rotating speed is little, thereby has reduced detectable operating mode scope.In addition, when Uneven road, under the situation of not catching fire, rotating speed also has bigger fluctuation, and this gives to catch fire to detect and has caused very big difficulty, in order to overcome this shortcoming, just need extra gravity accleration sensor senses road surface situation, avoid erroneous judgement, and this has increased the cost of automobile.Other several detecting methods need extra sensor too, the cost height.
Summary of the invention:
The objective of the invention is to overcome the corresponding shortcoming of existing above-mentioned various detecting methods, provided a kind of both can the detection exactly to catch fire, do not need extra sensor internal-combustion engine fire detecting method and system again.
Above-mentioned purpose of the present invention is achieved in that accompanying drawings is as follows:
A kind of internal-combustion engine fire detecting method carries out according to the following steps:
A) signal of the wide band oxygen sensor at the Rendezvous Point place that be installed in gas exhaust manifold of collection after Shelving is as the signal that detects, every certain crank angle wide band oxygen sensor is once sampled, this sampled value is deducted the sampled value of last time, be equivalent to the signal of wide band oxygen sensor has been carried out calculus of differences, obtain to be used to the diagnostic data that catches fire and judge;
B) according to the rotating speed and the load signal of the motor that collects, in the misfire diagnosis threshold value table, look into the threshold value of catching fire and judging corresponding to this operating mode, with the diagnostic data of the above-mentioned misfire diagnosis that obtains therewith threshold value compare, if the former during more than or equal to the latter, had both shown and has taken place once to catch fire.
C) calculate the frequency of catching fire with certain algorithm then, when this frequency of catching fire during greater than predetermined value, just to driver's output alarm signal.
The purpose of this patent provide a kind of applicable working condition scope big, detect accurately, use the existing sensor of automobile, do not increase the detecting method of catching fire of cost.For this reason, the present invention has adopted the signal of already used wide band oxygen sensor on the automobile as the signal that detects, every certain crank angle wide band oxygen sensor is once sampled, this sampled value is deducted the sampled value of last time, be equivalent to the signal of wide band oxygen sensor has been carried out calculus of differences, and in the pairing crank angle of once lighting a fire, this difference is got maximum value, just obtain being used to the diagnostic data that catches fire and judge.It is emphasized that, before the signal of gathering wide band oxygen sensor, need carry out Shelving to the signal of wide band oxygen sensor, thereby the electric noise (kHz level) of fluctuation of the signal that filtering air fuel ratio closed-loop feedback causes (frequency greatly about 0.5Hz between the 5Hz) and high frequency, because be that 7Hz is to 50Hz according to the catch fire frequency range of signal fluctuation of the wide band oxygen sensor that causes of the difference of rotating speed.Simultaneously, according to (this table is to obtain through a large amount of experimental calibration optimization at the misfire diagnosis threshold value table at the rotating speed that obtains the motor that diagnostic data collects simultaneously and load signal, and be stored in the control program of ECU of automobile) in look into the threshold value of catching fire and judging corresponding to this operating mode, then with the diagnostic data of the above-mentioned misfire diagnosis that obtains therewith threshold value compare, when the former during more than or equal to the latter, both shown and taken place once to catch fire.Calculate the frequency of catching fire with certain algorithm then, when this frequency of catching fire during greater than predetermined value, just to driver's output alarm signal.
The present invention is used for the detection system of internal-combustion engine fire detecting method, comprise the wide band oxygen sensor that is used for the acquisition testing signal, a stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MazSubroutine, the renewal control subprogram of the frequency of catching fire accumulated value, the judgement control subprogram of catching fire; Wide band oxygen sensor is installed in the position at enmgine exhaust Rendezvous Point place; A stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxSubroutine in, the mode that the collection of wide band oxygen sensor signal adopts external trigger to gather, promptly can in the time that bent axle whenever turns around, obtain pulse with engine flywheel number of teeth same number, whenever enter a pulse, just trigger this subprogram activation once from the speed probe of motor; The renewal control subprogram of the frequency of catching fire accumulated value is called once when each igniting, calculates Z
1The frequency of catching fire in the inferior igniting, Z
1Value can specifically be set according to concrete motor; Catch fire and judge the every Z of control subprogram
2Inferior igniting is called once, obtains the frequency accumulated value that catches fire, by relatively should value and the size of predetermined value B, to judge whether exporting warning sign to the driver.
A stroke of said calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxSubroutine comprise following steps:
In step S1, start the signal m that analog-to-digital conversion is gathered wide band oxygen sensor
1
In step S2, calculate this signal value m
1Signal value m with the last time
0Difference DELTA m
1, promptly be equivalent to signal is done difference processing with respect to the fixed crankshaft corner;
In step S3, compare the signal difference Δ m of this calculating
1And self ignition begins the peak signal difference DELTA m that calculates between this sampling period
Max, Δ m
MaxZero clearing when igniting if the former more than or equal to the latter, enters step S4, is upgraded the peak signal difference, if the former does not then upgrade Δ m less than the latter
MaxZero clearing when next time lighting a fire.
The renewal control subprogram of the said frequency accumulated value that catches fire may further comprise the steps:
In step S5, the counter of will lighting a fire adds 1;
In step S6, S7, read the load and the rotating speed of internal-combustion engine, judge operating mode, when not in predetermined scope, subroutine is returned, and when in predetermined scope, enters next step S8;
In step S8, according to operating mode computation of table lookup misfire diagnosis threshold value T;
In step S9, read the maximum changing value Δ m of the wide band oxygen sensor signal in the crank angle range
Max, as diagnostic data;
In step S10, the size of comparative diagnoses data and misfire diagnosis threshold value, when less than threshold value, subroutine is returned, and when greater than threshold value, the counter that catches fire adds 1;
In step S12, judge whether the igniting counter reaches Z
1Inferior, less than the time, subroutine is returned, and when equaling, calculates the frequency of catching fire, and calculates the frequency accumulated value that catches fire, then counter, accumulator Δ m
MaxZero clearing.
Said catching fire judges that control subprogram may further comprise the steps:
In step S16,, enter step S17: just, enter step S18 afterwards: the zero clearing frequency accumulated value that catches fire to driver's signal that gives the alarm when the frequency accumulated value that catches fire during more than or equal to predefined judgment threshold; When the frequency accumulated value that catches fire during less than predefined judgment threshold, do not enter step S17 and S18, subroutine is directly returned.
The invention has the beneficial effects as follows: proposed a kind of new method and system that is used for misfire diagnosis, this method and system has overcome many shortcomings of other misfire diagnosis methods, as the operating mode scope of diagnosing adaptation is little, needs are additional sensor, cost are high, realize that commercialization speed is fast, effective, have very vast market potentiality and actual application value.And can be China and aspect automobile failure diagnosis, increase an autonomous intellectual property.
Description of drawings:
Fig. 1 is the mounting point schematic representation of wide band oxygen sensor.
Fig. 2 be a stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxFlow chart.
Fig. 3 is the flow chart of the renewal control of the frequency accumulated value that catches fire in this fire detecting method.
Fig. 4 catches fire to judge the flow chart of control.
Embodiment:
Further specify particular content of the present invention below in conjunction with accompanying drawing illustrated embodiment.
This method that detects of catching fire is to detect the situation of change of the oxygen concentration in the waste gas of discharging from cylinder by wide band oxygen sensor, thus the generation of the phenomenon that judges whether to catch fire.When motor catches fire, the inflammable mixture that enters in the cylinder does not have burning just to enter in the outlet pipe in exhaust stroke, therefore the oxygen in the inflammable mixture is not consumed, make the oxygen concentration in the outlet pipe increase sharply, the output signal of wide band oxygen sensor sharply rises, and just can show the generation of catching fire.Waste gas is discharged from cylinder, enters air outlet flue through gas exhaust manifold, needs the regular hour, therefore, in order to detect the phenomenon of catching fire quickly, wide band oxygen sensor should be installed in the position of as far as possible close motor.Fig. 1 is to be example with 4 cylinder gasoline engines, the intention that the Rendezvous Point place that is installed in gas exhaust manifold of wide band oxygen sensor shows.
Fig. 2 be a stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxFlow chart.Corresponding to four-cylinder, corresponding crank shaft angle scope is 180 degree, i.e. angle between the double igniting of motor.For the collection of wide band oxygen sensor signal,, just need gather fast signal in order accurately to capture the sudden change of signal.The mode that adopts external trigger to gather to the collection of wide band oxygen sensor signal in this patent.(60-2) each tooth is arranged on the engine flywheel, can in the time that bent axle whenever turns around, obtain 58 pulses, whenever enter a pulse, just trigger this subprogram activation once from the speed probe of motor.
In step S1, start the signal m that analog-to-digital conversion is gathered wide band oxygen sensor
1
In step S2, calculate this signal value m
1Signal value m with the last time
0Difference DELTA m
1Promptly be equivalent to signal is done difference processing with respect to the fixed crankshaft corner.
In step S3, compare the signal difference Δ m of this calculating
1And self ignition begins the peak signal difference DELTA m that calculates between this sampling period
Max(Δ m
MaxZero clearing when igniting), if the former is more than or equal to the latter, illustrate that then signal has bigger variation, so enter step S4, the peak signal difference is upgraded, during next time igniting by the time, just can be obtained the write music maximum value of signal difference in the Shaft angle of 180 between twice burn period.If the former is less than the latter then do not upgrade.Do the erroneous judgement that just can avoid the unusual fluctuations because of the wide band oxygen sensor signal to cause like this.
Fig. 3 is the flow chart of the renewal control of the frequency accumulated value that catches fire in this fire detecting method.
This subroutine is called once when each igniting, calculates Z
1The frequency of catching fire in (this value can specifically be set according to concrete motor, is preset as 500 herein) inferior igniting.
In step S5, the counter of will lighting a fire adds 1.
In step S6, S7, read the load and the rotating speed of internal-combustion engine, judge operating mode.When not in predetermined scope, subroutine is returned.When in predetermined scope, enter next step S8.
In step S8, according to operating mode computation of table lookup misfire diagnosis threshold value T.
In step S9, read the one 180 maximum changing value Δ m that write music the wide band oxygen sensor signal in the Shaft angle scope
Max, as diagnostic data.
In step S10, the size of comparative diagnoses data and misfire diagnosis threshold value, when less than threshold value, subroutine is returned, and when greater than threshold value, the counter that catches fire adds 1.
In step S12, judge whether the igniting counter reaches Z
1Inferior, less than the time, subroutine is returned;
S13: when equaling, calculate the frequency of catching fire; S14: calculate the frequency accumulated value that catches fire; S15: to some counters, accumulator Δ m
MaxZero clearing.
Fig. 4 catches fire to judge the flow chart of control.
The every Z of this subroutine
2(this value can specifically be set according to concrete motor, is preset as 2500 herein) inferior igniting is called once, to judge whether exporting warning sign to the driver.When the frequency accumulated value that catches fire during more than or equal to predefined judgment threshold, just to driver's signal that gives the alarm, and the zero clearing frequency accumulated value that catches fire.When the frequency accumulated value that catches fire during less than predefined judgment threshold, do not enter step S17 and S18, subroutine is directly returned.
The every Z of the frequency of catching fire of motor
1Inferior igniting can obtain once, and this subroutine is every Z
2Inferior igniting is called once.Therefore, the used frequency accumulated value that catches fire is by with continuous n (n=Z in this subroutine
2/ Z
1) individual Z
1The frequency addition of catching fire of inferior igniting obtains.
Claims (5)
1, a kind of internal-combustion engine fire detecting method is characterized in that carrying out according to the following steps:
A) signal of the wide band oxygen sensor at the Rendezvous Point place that be installed in gas exhaust manifold of collection after Shelving is as the signal that detects, every certain crank angle wide band oxygen sensor is once sampled, this sampled value is deducted the sampled value of last time, be equivalent to the signal of wide band oxygen sensor has been carried out calculus of differences, obtain to be used to the diagnostic data that catches fire and judge;
B) according to the rotating speed and the load signal of the motor that collects this moment, in the misfire diagnosis threshold value table, look into the threshold value of catching fire and judging corresponding to this operating mode, with the diagnostic data of the above-mentioned misfire diagnosis that obtains therewith threshold value compare, if the former during more than or equal to the latter, promptly shows and has taken place once to catch fire;
C) calculate the frequency of catching fire with certain algorithm then, when this frequency of catching fire during greater than predetermined value, just to driver's output alarm signal.
2, a kind of detection system that is used for the internal-combustion engine fire detecting method, it is characterized in that comprising the wide band oxygen sensor that is used for the acquisition testing signal, a stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxSubroutine, the renewal control subprogram of the frequency of catching fire accumulated value, the judgement control subprogram of catching fire; Wide band oxygen sensor is installed in the position at enmgine exhaust Rendezvous Point place; A stroke of calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxSubroutine in, the mode that the collection of wide band oxygen sensor signal adopts external trigger to gather, promptly can in the time that bent axle whenever turns around, obtain pulse with engine flywheel number of teeth same number, whenever enter a pulse, just trigger this subprogram activation once from the speed probe of motor; The renewal control subprogram of the frequency of catching fire accumulated value is called once when each igniting, calculates Z
1The frequency of catching fire in the inferior igniting, Z
1Value is specifically set according to concrete motor; Catch fire and judge the every Z of control subprogram
2Inferior igniting is called once, obtains the frequency accumulated value that catches fire, by relatively should value and the size of predetermined value B, to judge whether exporting warning sign to the driver, Z
2, the B value specifically sets according to concrete motor.
3, the detection system that is used for the internal-combustion engine fire detecting method according to claim 2, it is characterized in that a stroke of said calculation engine the maximum value Δ m of signal difference in the corresponding crank shaft angle scope
MaxSubroutine comprise following steps:
In step S1, start the signal m that analog-to-digital conversion is gathered wide band oxygen sensor
1
In step S2, calculate this signal value m
1Signal value m with the last time
0Difference DELTA m
1, promptly be equivalent to signal is done difference processing with respect to the fixed crankshaft corner;
In step S3, compare the signal difference Δ m of this calculating
1And self ignition begins the peak signal difference DELTA m that calculates between this sampling period
Max, Δ m
MaxZero clearing when igniting if the former more than or equal to the latter, enters step S4, is upgraded the peak signal difference, if the former does not then upgrade Δ m less than the latter
MaxZero clearing when next time lighting a fire.
4, the detection system that is used for the internal-combustion engine fire detecting method according to claim 2 is characterized in that the renewal control subprogram of the said frequency accumulated value that catches fire may further comprise the steps:
In step S5, the counter of will lighting a fire adds 1;
In step S6, S7, read the load and the rotating speed of internal-combustion engine, judge operating mode, when not in predetermined scope, subroutine is returned, and when in predetermined scope, enters next step S8;
In step S8, according to operating mode computation of table lookup misfire diagnosis threshold value T;
In step S9, read the maximum changing value Δ m of the wide band oxygen sensor signal in the crank angle range
Max, as diagnostic data;
In step S10, the size of comparative diagnoses data and misfire diagnosis threshold value, when less than threshold value, subroutine is returned, and when greater than threshold value, the counter that catches fire adds 1;
In step S12, judge whether the igniting counter reaches Z
1Inferior, less than the time, subroutine is returned, and when equaling, calculates the frequency of catching fire, and calculates the frequency accumulated value that catches fire, then counter, accumulator, Δ m
MaxZero clearing.
5, the detection system that is used for the internal-combustion engine fire detecting method according to claim 2 is characterized in that the said judgement control subprogram of catching fire may further comprise the steps:
In step S16,, enter step S17: just, enter step S18 afterwards: the zero clearing frequency accumulated value that catches fire to driver's signal that gives the alarm when the frequency accumulated value that catches fire during more than or equal to predefined judgment threshold; When the frequency accumulated value that catches fire during less than predefined judgment threshold, do not enter step S17 and S18, subroutine is directly returned.
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| CNB2006101632983A CN100445542C (en) | 2006-12-22 | 2006-12-22 | Fire detecting method and system of internal combustion engine |
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|---|---|---|---|
| CNB2006101632983A CN100445542C (en) | 2006-12-22 | 2006-12-22 | Fire detecting method and system of internal combustion engine |
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| CN100445542C true CN100445542C (en) | 2008-12-24 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469644B (en) * | 2007-12-25 | 2012-08-22 | 比亚迪股份有限公司 | Engine misfire judging method |
| JP4946889B2 (en) * | 2008-01-23 | 2012-06-06 | トヨタ自動車株式会社 | Misfire detection device for internal combustion engine |
| US8229655B2 (en) * | 2009-05-19 | 2012-07-24 | GM Global Technology Operations LLC | Fuel injection and combustion fault diagnostics using cylinder pressure sensor |
| US7769534B1 (en) * | 2009-10-13 | 2010-08-03 | Gm Global Technology Operations, Inc. | Asymmetrical oxygen sensor diagnostic and degradation compensation systems |
| CN101881233B (en) * | 2010-03-19 | 2013-02-13 | 清华大学 | Engine misfire detection method and detection system thereof |
| US8683976B2 (en) | 2011-02-16 | 2014-04-01 | Ford Global Technologies, Llc | Spark plug degradation detection |
| CN102748181B (en) * | 2012-08-01 | 2014-11-05 | 潍柴动力股份有限公司 | Method and device for diagnosing faults of fuel injector |
| US9328687B2 (en) * | 2013-02-11 | 2016-05-03 | Ford Global Technologies, Llc | Bias mitigation for air-fuel ratio sensor degradation |
| US10161326B2 (en) * | 2016-06-01 | 2018-12-25 | Ford Global Technologies, Llc | Methods and systems for cylinder misfire detection |
| CN108240262B (en) * | 2016-12-26 | 2020-08-28 | 联合汽车电子有限公司 | Method for acquiring misfire signal of engine and calibration method of misfire threshold value |
| JP6550408B2 (en) * | 2017-02-08 | 2019-07-24 | 三菱重工エンジン＆ターボチャージャ株式会社 | Engine misfire detection apparatus and method |
| CN110608097B (en) * | 2018-06-15 | 2022-01-18 | 联合汽车电子有限公司 | Engine misfire detection method |
| CN111120094B (en) * | 2019-11-29 | 2021-02-23 | 潍柴动力股份有限公司 | Engine fire detection method and device, storage medium and terminal |
| CN112857814A (en) * | 2021-03-24 | 2021-05-28 | 潍柴动力股份有限公司 | Engine fire monitoring method and system and vehicle |
| CN114544186B (en) * | 2022-02-23 | 2024-03-26 | 中国第一汽车股份有限公司 | Engine misfire diagnosis method and vehicle |
| CN114687842B (en) * | 2022-04-20 | 2023-08-18 | 潍柴动力股份有限公司 | Three-way catalyst failure diagnosis method |
| CN115506907B (en) * | 2022-09-30 | 2024-04-16 | 长城汽车股份有限公司 | Vehicle control method and device, vehicle and storage medium |
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