CN100545437C - Engine fire decision maker and misfire determining method thereof - Google Patents
Engine fire decision maker and misfire determining method thereof Download PDFInfo
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- CN100545437C CN100545437C CNB2006100210537A CN200610021053A CN100545437C CN 100545437 C CN100545437 C CN 100545437C CN B2006100210537 A CNB2006100210537 A CN B2006100210537A CN 200610021053 A CN200610021053 A CN 200610021053A CN 100545437 C CN100545437 C CN 100545437C
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Abstract
The present invention discloses a kind of engine fire decision maker and misfire determining method, cylinder pressure sensors is gathered cylinder pressure signal in real time, electronic control unit calculates surge pressure in this circulation cylinder according to this pressure signal, with this surge pressure and the motor that presets normal during fire burns the pressure threshold value in the cylinder compare, when detected real-time peak cylinder pressure value during less than this threshold values, judge engine fire, and gather the fuel level in tank signal in real time in conjunction with fuel level sensor, shielding low oil level misfire diagnosis.The present invention can judge catching fire under the motor steady working condition, the program simplification that catches fire and judge, easily realization, low cost.Owing to be real-time detection to the engine combustion situation, catching fire in the time of can judging transient condition such as acceleration, deceleration exactly and travel on the road surface of jolting improved greatly to the accuracy rate of misfire determining.In conjunction with the real-time detection to oil level, shielding low oil level misfire diagnosis is avoided the not ablaze misfire diagnosis that causes of motor that causes because of oil starvation, improves the accuracy of misfire diagnosis.
Description
[technical field]
The present invention relates to a kind of device and method of judging engine fire.
[background technique]
Petrol engine in the running because do not get angry, the mixed gas overrich or rare with excessivelying, compression pressure is low or other reasons, causing sucking the interior mixed gas of cylinder can not burn, and is called as and catches fire.Because the engine fire phenomenon not only can injure triple effect catalytic converter when serious, can make toxic emission be higher than arm's length standard, befouling environment simultaneously.This has been launched research both at home and abroad, each discloses a kind of equipment that catches fire Japanese unexamined patent publication No.04-171249 and Japanese unexamined communique No.58-051243, by the data of calculation engine rotating speed, judges and whether catches fire.
In Chinese patent application CN200410037513.6 and CN200410037512.1, disclose a kind ofly, and this threshold value has been revised according to the data of representing the average correlation between diagnostic data and the threshold value according to expression internal-combustion engine rotational speed diagnostic data that changes and the method for catching fire based on relatively judging whether between the threshold value of internal combustion engine state.Although disappear except when because flywheel is loosening or the influence of the non-factors of catching fire such as wearing and tearing of clutch when causing engine speed change, but engine roughness, automobile is in and adds, transient conditions such as deceleration and travelling when jolting the road surface, the rotating speed of motor also can change, just can not accurately judge owing to catch fire this moment and cause the variation of engine speed, it still is the engine speed change that causes owing to special operation condition, therefore can adopt an acceleration transducer be used to the to jolt judgement on road surface, shield misfire diagnosis in case of necessity, just there is certain defective in this, can not diagnose out catching fire of this moment.
[summary of the invention]
The objective of the invention is: at first, provide a kind of judge engine fire decision maker and misfire determining method thereof simple, that easily realize; Take second place,, provide a kind of adaptation various operating mode, accurately effective engine fire decision maker of misfire determining and misfire determining method thereof in order to overcome above deficiency of the prior art.
For achieving the above object, the present invention proposes a kind of engine fire decision maker, comprises cylinder pressure sensors, electronic control unit and fuel level sensor, and described cylinder pressure sensors, described fuel level sensor are connected with described electronic control unit respectively; Described cylinder pressure sensors is gathered cylinder pressure signal in real time, electronic control unit calculates surge pressure in this circulation cylinder according to this pressure signal, with this surge pressure and the motor that presets normal during fire burns the pressure threshold value in the cylinder compare, when detected surge pressure during, judge engine fire less than this threshold values; Described fuel level sensor is used to detect the oil level of fuel tank, so that shield misfire diagnosis when low oil level.
Above-mentioned device also comprises the operating mode detection unit, is connected with described electronic control unit, is used for the various working staties of real-time detection of engine.Described operating mode detection unit comprises engine rotation speed sensor, throttle position sensor, Air flow meter or intake temperature pressure transducer, cooling-water temperature transmitter, is connected with described electronic control unit respectively.Also comprise alarm unit, be connected, be used for the output alarm index signal with described electronic control unit.
Simultaneously, the present invention proposes a kind of engine fire decision method, comprise the steps: that cylinder pressure sensors gathers cylinder pressure signal in real time, electronic control unit calculates surge pressure in this circulation cylinder according to this pressure signal, with this surge pressure and the motor that presets normal during fire burns the pressure threshold value in the cylinder compare, when detected surge pressure during, judge engine fire less than this threshold values; And gather the fuel level in tank signal in real time in conjunction with fuel level sensor, electronic control unit is according to this oil level signal shielding low oil level misfire diagnosis.
Above-mentioned misfire determining method, also in conjunction with the real-time various work informations of gathering of motor of operating mode detection unit, electronic control unit is determined the fire loss ratio of motor under certain state, compare with the engine fire rate of demarcating, the electronic control unit output alarm signal is reported to the police when exceeding this calibration value.The work information that described operating mode detection unit is gathered in real time comprises engine speed, throttle position, air mass flow, coolant temperature.
Above-mentioned misfire determining method according to the fire loss ratio under the different operating modes, judges that the type that fire loss ratio exceeds standard is discharging infringement type or catalyst converter infringement type, and electronic control unit sends different warning indications according to the difference type control alarm unit that exceeds standard.
Because adopted above scheme, apparatus and method of the present invention can be judged catching fire under the motor steady working condition, the program simplification that catches fire and judge, easily realization, low cost.
In the inventive method, be the real-time detection to the engine combustion situation, catching fire in the time of can judging transient conditions such as acceleration, deceleration exactly and travel on the road surface of jolting improved greatly to the accuracy rate of misfire determining.In conjunction with the real-time detection to oil level, shielding low oil level misfire diagnosis is avoided the not ablaze misfire diagnosis that causes of motor that causes because of oil starvation, improves the accuracy of misfire diagnosis.
Method of the present invention, can also be by determining the working state of motor, real-time monitoring engine fire loss ratio, catch fire percentage relatively by what exceed standard with the engine emission of demarcating, monitor engine emission in real time, in time discharge the warning that exceeds standard, remind the driver to seek to repair, improve the energy-saving and environmental protection performance of vehicle.
[description of drawings]
Fig. 1 is engine fire diagnosis embodiment's of the present invention system diagram.
Fig. 2 is engine fire diagnosis embodiment's of the present invention control flow chart.
[embodiment]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
As shown in Figure 1, engine fire diagnosis apparatus of the present invention comprises operating mode detection unit, cylinder pressure sensors 6, fuel level sensor 4, electronic control unit 7 and fault indicating lamp 8.The working condition of operating mode detection unit detection of engine, to determine the operating mode of motor, this unit comprises speed probe 1, Air flow meter 2, throttle position sensor 3 and cooling-water temperature transmitter 5.Cylinder pressure sensors 6 is in order to measure the pressure in the cylinder, and the force value that records is thus judged the combustion position of motor, to determine whether motor catches fire.Fuel level sensor 4 is in order to measuring the oil level of fuel tank, so as when low oil level the shielding misfire diagnosis, eliminate the motor that causes because of oil starvation not fire burns, improve the accuracy of misfire diagnosis.Operating mode detection unit, cylinder pressure sensors 6 and fuel level sensor 4 link to each other with the signal input part of electronic control unit 7 respectively, electronic control unit comes to determine the fire loss ratio of motor under certain operating mode thus, when causing discharging to exceed standard because of catching fire, the electronic control unit output signal, the control fault signaling lamp is reported to the police.
For petrol engine, when piston reaches the top dead center compression at the end, pressure in the cylinder is 0.6～1.2MPa, and when the spark plug ignition, when the mixed gas of compression is by ignition combustion in the cylinder, pressure maximum in the cylinder can be up to 3～5MPa, thus a pressure threshold value can be set in electronic control unit, this pressure threshold value can be definite by testing, when motor moves, when lighting a fire at every turn, by the cylinder pressure signal after the cylinder pressure sensors collection igniting, electronic control unit cylinder pressure signal thus can calculate the peak cylinder pressure value, and this pressure and pressure threshold value are compared, and can judge engine fire as if little.This pressure judgement not only is applicable to the stable state judgement, and can judge on the acceleration, deceleration instantaneous conditions and the road surface of jolting that also precision is higher simultaneously.
This routine control flow chart is as shown in Figure 2:
In step 21, electronic control unit receives the input signal of the detected engine working conditions of operating mode detection unit, the operating mode detection unit comprises speed probe 1, Air flow meter 2, throttle position sensor 3 and cooling-water temperature transmitter 5, is used for determining the operating conditions of motor.
In step 22, electronic control unit receives the signal of fuel level sensor 4, judges oil box level, and to determine whether the judgement of catching fire, if oil level is lower, then execution in step 28, shields the judgement of catching fire, otherwise execution in step 23.
In step 23, the electronic control unit counting of then lighting a fire.
In step 24, electronic control unit then will be compared by peak pressure value and the pressure threshold value that cylinder pressure sensors records, if less than this threshold values, then execution in step 25.This threshold values be motor normal the peak pressure value in cylinder during fire burns.
In step 25, count the number of times that catches fire, and store with the form of diagnostic trouble code.
In step 26, judge to catch fire whether exceed limit value, when fire loss ratio exceeded standard, then execution in step 27.
In step 27, electronic control unit controls signal fault lamp is reported to the police.Because at engine operating condition not simultaneously, its fire loss ratio can be judged the type that fire loss ratio exceeds standard according to the fire loss ratio under the different operating modes to the difference that influences of discharging; When exceeding standard, fire loss ratio only causes the motor discharging that exceeds standard, but when being unlikely to damage catalyst converter, is discharging infringement type that report that the electronic control unit output alarm signal is lighted trouble light this moment in two continuous work cycle; When comparing with calibration value, fire loss ratio is excessive, is catalyst converter infringement type, and the electronic control unit controls trouble light is lighted immediately and glimmered at this moment.Wherein, the fire loss ratio much meetings of scope that exceed standard cause the damage of catalyst converter, demarcate to determine by test.
In sum, the present invention calculates pressure in the cylinder by cylinder pressure sensors, judges thus whether motor catches fire, and not only can simplify decision procedure, and simultaneously applicable to any operating mode, and precision is higher.
Claims (8)
1, a kind of engine fire decision maker is characterized in that: comprise cylinder pressure sensors, electronic control unit and fuel level sensor, described cylinder pressure sensors, described fuel level sensor are connected with described electronic control unit respectively; Described cylinder pressure sensors is gathered cylinder pressure signal in real time, electronic control unit calculates surge pressure in this circulation cylinder according to this pressure signal, with this surge pressure and the motor that presets normal during fire burns the pressure threshold value in the cylinder compare, when detected surge pressure during, judge engine fire less than this pressure threshold value; Described fuel level sensor is used to detect the oil level of fuel tank, so that shield misfire diagnosis when low oil level.
2, device as claimed in claim 1 is characterized in that: also comprise the operating mode detection unit, be connected with described electronic control unit, be used for the various working staties of real-time detection of engine.
3, device as claimed in claim 1 is characterized in that: also comprise alarm unit, be connected with described electronic control unit, be used for the output alarm index signal.
4, device as claimed in claim 2, it is characterized in that: described operating mode detection unit comprises engine rotation speed sensor, throttle position sensor, Air flow meter or intake temperature pressure transducer, cooling-water temperature transmitter, is connected with described electronic control unit respectively.
5, engine fire decision method, comprise the steps: that cylinder pressure sensors gathers cylinder pressure signal in real time, electronic control unit calculates surge pressure in this circulation cylinder according to this pressure signal, with this surge pressure and the motor that presets normal during fire burns the pressure threshold value in the cylinder compare, when detected surge pressure during, judge engine fire less than this pressure threshold value; And gather the fuel level in tank signal in real time in conjunction with fuel level sensor, electronic control unit is according to this oil level signal shielding low oil level misfire diagnosis.
6, misfire determining method as claimed in claim 5, it is characterized in that: in conjunction with the real-time various work informations of gathering of motor of operating mode detection unit, electronic control unit is determined the fire loss ratio of motor under certain state, compare with the engine fire rate of demarcating, the electronic control unit output alarm signal is reported to the police when exceeding this calibration value.
7, misfire determining method as claimed in claim 6, it is characterized in that: according to the fire loss ratio under the different operating modes, judge that the type that fire loss ratio exceeds standard is discharging infringement type or catalyst converter infringement type, electronic control unit sends different warning indications according to the difference type control alarm unit that exceeds standard.
8, misfire determining method as claimed in claim 6 is characterized in that: the work information that described operating mode detection unit is gathered in real time comprises engine speed, throttle position, air mass flow, coolant temperature.
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| CNB2006100210537A CN100545437C (en) | 2006-05-24 | 2006-05-24 | Engine fire decision maker and misfire determining method thereof |
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| CNB2006100210537A CN100545437C (en) | 2006-05-24 | 2006-05-24 | Engine fire decision maker and misfire determining method thereof |
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| CN101078379A CN101078379A (en) | 2007-11-28 |
| CN100545437C true CN100545437C (en) | 2009-09-30 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102072818B (en) * | 2010-11-09 | 2013-06-26 | 联合汽车电子有限公司 | Method for obtaining fire detection signal of cylinder of engine with speed sensor arranged in front |
| JP5832130B2 (en) * | 2011-04-20 | 2015-12-16 | 三菱電機株式会社 | Control device for internal combustion engine |
| CN102817738B (en) * | 2012-08-31 | 2016-05-04 | 长城汽车股份有限公司 | A kind of hcci engine Detection & Controling method of catching fire |
| US9316565B2 (en) * | 2013-01-14 | 2016-04-19 | Cummins Inc. | Exhaust manifold pressure based misfire detection for internal combustion engines |
| CN104121095B (en) * | 2013-04-24 | 2018-12-25 | 联合汽车电子有限公司 | The method for diagnosing faults of speed probe |
| US10242511B2 (en) * | 2016-12-29 | 2019-03-26 | Bosch Automotive Service Solutions Inc. | Using on-board monitoring (mode 6) misfire tests in data stream and physical addressing |
| CN108729981A (en) * | 2018-05-21 | 2018-11-02 | 潍柴动力股份有限公司 | A kind of exhaust treatment system and processing method |
| CN114576004B (en) * | 2022-02-22 | 2023-05-23 | 潍柴动力股份有限公司 | Engine combustion diagnosis method, diagnosis device and engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1653071A1 (en) * | 2003-08-06 | 2006-05-03 | Toyota Jidosha Kabushiki Kaisha | Control device and misfire determination method for internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1653071A1 (en) * | 2003-08-06 | 2006-05-03 | Toyota Jidosha Kabushiki Kaisha | Control device and misfire determination method for internal combustion engine |
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Assignee: CHANGSHA BYD AUTO CO., LTD. Assignor: Biyadi Co., Ltd. Contract record no.: 2010440020026 Denomination of invention: Engine catching fire determining device and method Granted publication date: 20090930 License type: Exclusive License Open date: 20071128 Record date: 20100427 |