CN102749200B - Engine state monitoring method based on automobile voltage - Google Patents
Engine state monitoring method based on automobile voltage Download PDFInfo
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- CN102749200B CN102749200B CN201210258390.3A CN201210258390A CN102749200B CN 102749200 B CN102749200 B CN 102749200B CN 201210258390 A CN201210258390 A CN 201210258390A CN 102749200 B CN102749200 B CN 102749200B
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Abstract
The invention discloses an engine state monitoring method based on an automobile voltage. The method comprises the following steps of: enabling a control module to read a power supply voltage of an automobile through an external analog to digital converter every second; storing the read power supply voltage into a circulating linked list according to a time sequence; calculating and recording an ignition voltage and a flame-out voltage of an automobile engine by using a memory algorithm; and judging the current state of the automobile engine by using the ignition voltage, the flame-out voltage and the current power supply voltage of the automobile engine. Through the adoption of the engine state monitoring method based on the automobile voltage, disclosed by the invention, an additional peripheral device is not needed, the judging accuracy is made accurate, and the design and use cost is also reduced; in addition, supports from automobile manufacturers or manufacturer models are not needed, so that the generality of the engine state monitoring method based on the automobile voltage is satisfied.
Description
Technical field
The present invention relates to a kind of car engine state to detect and car networking technology, particularly relate to a kind of engine state monitor method based on automotive voltage.
Background technology
Nowadays car networking technology develop rapidly, therefore the eruptive growth of vehicle electronic device is brought, as vehicle-carrying communication module, vehicle-mounted radio electronic label etc., this series products has a common ground, they need vehicle electrical system to power to them, and they generally just have a large amount of data processings and transmission in car running process.And due to motor car engine out-of-work time, vehicle electric power is all provided by automobile storage battery, if vehicle electronic device is in normal operating conditions always, can produce very large consumption to automobile storage battery, causes next automobile normally not start.Present solution is all generally in time detecting that motor car engine is out-of-work, allows vehicle electronic device enter the sleep pattern of low-power consumption.
Detect transmitter state now and have two kinds of modes: 1, according to the definition of ISO15765 and ISO15031 standard, CAN bus (hereinafter referred CAN-BUS) agreement can be passed through and read rotating speed of automobile engine, judge whether engine starts according to engine speed.2, the regulation of OBD (hereinafter referred OBD) interface, regulation pin 8 for manufacturer reserved, a lot of automobile vendor all can judge engine condition with this pin.When transmitter is not activated time, this pin is unsettled, when engine start, this pin exports the high voltage of a 14v.Vehicle electronic device can detect the state of engine by the change of this level.
Above-mentioned two kinds of modes have following deficiency for vehicle electronic device:
1. they need extra connecting line.For mode 1, he needs two data buss connecting CAN-BUS, and for mode 2, then needs to connect pin 8 on vehicle electronic device.Extra connecting line does not tightly make installation process complicated, increases the cost of vehicle electronic device simultaneously yet.Vehicle electronic device needs a lot of peripheral components to unify the level between connecting line.For mode 1, vehicle electronic device also must meet the data protocol of CAN-BUS by increasing peripheral components.
2. they need the support of automobile vendor or manufacturer's vehicle.In Chinese car market now, only having the brand of middle and high end and vehicle just to support for mode 1, CAN-BUS, for most tens of economy car of many ten thousand, is all not containing CAN-BUS.For mode 2, pin level judges engine condition also according to different automobile vendor oneself definition, and general Japanese vehicle has this pin, but the part vehicle of AM General does not just comprise this pin.Even if we are by increasing old and increase connecting line like this, the versatility of vehicle electronic device can not be met.
Summary of the invention
The present invention, mainly for the deficiencies in the prior art, provides that a kind of accuracy is high, the engine state monitor method based on automotive voltage of highly versatile.
To achieve these goals, the invention provides following technical scheme:
Based on an engine state monitor method for automotive voltage, it comprises: control module is by the supply voltage of an external analog digital converter reading per second automobile; According to the order of time, by the supply voltage of reading stored in circular linked list; Adopt Memory algorithm, calculate and record ignition voltage and the extinction voltage of motor car engine; Utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the state of current motor car engine is judged.
As a preferred embodiment of the present invention, described control module have employed 8 channel analog multiplexer that model is NXP4851.
As a preferred embodiment of the present invention, automobile mounted automatic diagnosis system provides described supply voltage.
As a preferred embodiment of the present invention, described employing Memory algorithm, calculates and the concrete steps of the ignition voltage and extinction voltage that record motor car engine comprise:
The detection of voltage rise zone bit is carried out to the supply voltage in circular linked list;
If voltage rise zone bit detected, then judge current and whether remain continuous high-voltage point be voltage rise;
If be voltage rise, then determine to light a fire zone bit, extinction voltage be before the mean value of 20 seconds voltage, ignition voltage be current point in time before the mean value of 20 seconds voltage, and determine to can't detect voltage rise zone bit;
If be not voltage rise, then the number of times of the continuous high-voltage point of residue be set to 20, and determine to can't detect voltage rise zone bit;
If can't detect voltage rise zone bit, then judge current and whether remain continuous high-voltage point be voltage rise;
If be voltage rise, then determine voltage rise zone bit to be detected, determine that current point in time is time point voltage rise being detected.
As a preferred embodiment of the present invention, the Rule of judgment of described voltage rise is: if the voltage ratio of random time all large 0.8v of 20 second time all voltage before it, be then voltage rise.
As a preferred embodiment of the present invention, describedly utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the concrete steps that the state of current motor car engine judges comprised:
Current supply voltage and described extinction voltage are compared;
If current supply voltage be less than described extinction voltage add described igniting time voltage difference 25 percent, and 20 supply voltages are all less than 25 percent of voltage difference when described extinction voltage adds described igniting afterwards, then judge that current time is as engine kill state;
If do not meet the condition of flameout state, be namely judged as that engine is in fired state.
As can be seen from technique scheme, the engine state monitor method based on automotive voltage of the present invention, does not need to increase extra peripheral components, and the accurate accuracy judged, decreases the cost of design and use simultaneously; In addition, it does not need the support of automobile vendor or manufacturer's vehicle, thus meets the described versatility based on the engine state monitor method of automotive voltage.
Accompanying drawing explanation
Fig. 1 is the structural representation of engine state monitor method one preferred embodiment that the present invention is based on automotive voltage;
Fig. 2 is described employing Memory algorithm, calculates and records the ignition voltage of motor car engine and the schematic flow sheet of extinction voltage.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult Fig. 1, Fig. 1 is the schematic flow sheet of engine state monitor method one preferred embodiment that the present invention is based on automotive voltage; Fig. 2 is described employing Memory algorithm, calculates and records the ignition voltage of motor car engine and the schematic flow sheet of extinction voltage.
Based on an engine state monitor method for automotive voltage, it comprises: control module is by the supply voltage of an external analog digital converter reading per second automobile; According to the order of time, by the supply voltage of reading stored in circular linked list; Adopt Memory algorithm, calculate and record ignition voltage and the extinction voltage of motor car engine; Utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the state of current motor car engine is judged.
Electric energy needed for vehicle electrical system is supplied by two power supplys: generator and accumulator.Generator is worked by engine rotation.After automobile engine starting, engine rotation is electric energy by generator changes mechanical energy, and these electric energy parts are powered to vehicle electronics, in addition unnecessary electric energy to charge in batteries, make the state-of-charge that accumulator remains intact.Because generator needs to charge a battery, the voltage requiring generator to provide like this must be higher than battery tension.So when engine is not activated, there is the switching of a storage battery power supply to generator powered, the present invention studies this switching characteristic to judge the state of engine, can increase precision during judgement like this.
Described control module have employed 8 channel analog multiplexer that model is NXP4851.
Automobile mounted automatic diagnosis system provides described supply voltage.
Described employing Memory algorithm, calculates and the concrete steps of the ignition voltage and extinction voltage that record motor car engine comprise: carry out the detection of voltage rise zone bit to the supply voltage in circular linked list; If voltage rise zone bit detected, then judge current and whether remain continuous high-voltage point be voltage rise; If be voltage rise, then determine to light a fire zone bit, extinction voltage be before the mean value of 20 seconds voltage, ignition voltage be current point in time before the mean value of 20 seconds voltage, and determine to can't detect voltage rise zone bit; If be not voltage rise, then the number of times of the continuous high-voltage point of residue be set to 20, and determine to can't detect voltage rise zone bit; If can't detect voltage rise zone bit, then judge current and whether remain continuous high-voltage point be voltage rise; If be voltage rise, then determine voltage rise zone bit to be detected, determine that current point in time is time point voltage rise being detected.
The Rule of judgment of described voltage rise is: if the voltage ratio of random time all large 0.8v of 20 second time all voltage before it, be then voltage rise.
There is provided electric current due to generator in different automobile current generator and the variant and running car of battery tension and actually use curent change, simply can not judge engine condition by the method for judgment threshold, so employing Memory algorithm, utilize voltage jump when the most obvious also the most regular igniting in change in voltage, record prefiring voltage and later voltage of lighting a fire, be used for the voltage determining next time to stop working, with this make the described engine state monitor method based on automotive voltage more accurately, versatility is stronger.
Describedly utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the concrete steps that the state of current motor car engine judges are comprised: current supply voltage and described extinction voltage are compared; If current supply voltage be less than described extinction voltage add described igniting time voltage difference 25 percent, and 20 supply voltages are all less than 25 percent of voltage difference when described extinction voltage adds described igniting afterwards, then judge that current time is as engine kill state; If do not meet the condition of flameout state, be namely judged as that engine is in fired state.
Engine state monitor method based on automotive voltage of the present invention, only needs connecting power line, and not needing increases extra peripheral components, and the accurate accuracy judged, decreases the cost of design and use simultaneously; In addition, it does not need the support of automobile vendor or manufacturer's vehicle, thus meets the described versatility based on the engine state monitor method of automotive voltage.
The above; be only the embodiment of the preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the technical scope disclosed by the present invention; the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention.
Claims (3)
1. based on an engine state monitor method for automotive voltage, it is characterized in that, comprising: control module is by the supply voltage of an external analog digital converter reading per second automobile; According to the order of time, by the supply voltage of reading stored in circular linked list; Adopt Memory algorithm, calculate and record ignition voltage and the extinction voltage of motor car engine; Utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the state of current motor car engine is judged;
Described employing Memory algorithm, calculates and the concrete steps of the ignition voltage and extinction voltage that record motor car engine comprise:
The detection of voltage rise zone bit is carried out to the supply voltage in circular linked list, and the Rule of judgment of described voltage rise is: if the voltage ratio of random time all large 0.8v of 20 second time all voltage before it, be then voltage rise;
If voltage rise zone bit detected, then judge current and whether remain continuous high-voltage point be voltage rise;
If be voltage rise, then determine to light a fire zone bit, extinction voltage be before the mean value of 20 seconds voltage, ignition voltage be current point in time before the mean value of 20 seconds voltage, and determine to can't detect voltage rise zone bit;
If be not voltage rise, then the number of times of the continuous high-voltage point of residue be set to 20, and determine to can't detect voltage rise zone bit;
If can't detect voltage rise zone bit, then judge current and whether remain continuous high-voltage point be voltage rise;
If be voltage rise, then determine voltage rise zone bit to be detected, determine that current point in time is time point voltage rise being detected.
2. the engine state monitor method based on automotive voltage according to claim 1, is characterized in that, described control module have employed 8 channel analog multiplexer that model is NXP4851.
3. the engine state monitor method based on automotive voltage according to claim 1, it is characterized in that, describedly utilize the ignition voltage of motor car engine, extinction voltage and current supply voltage, the concrete steps that the state of current motor car engine judges comprised:
Current supply voltage and described extinction voltage are compared;
If current supply voltage be less than described extinction voltage add described igniting time voltage difference 25 percent, and 20 supply voltages are all less than 25 percent of voltage difference when described extinction voltage adds described igniting afterwards, then judge that current time is as engine kill state;
If do not meet the condition of flameout state, be namely judged as that engine is in fired state.
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| CN201210258390.3A CN102749200B (en) | 2012-07-25 | 2012-07-25 | Engine state monitoring method based on automobile voltage |
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| CN201210258390.3A CN102749200B (en) | 2012-07-25 | 2012-07-25 | Engine state monitoring method based on automobile voltage |
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| CN102749200B true CN102749200B (en) | 2015-01-21 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879211B (en) * | 2012-10-29 | 2015-07-01 | 北京开元智信通软件有限公司 | Vehicle detection terminal, system and method |
| CN103407375B (en) * | 2013-08-02 | 2015-08-19 | 广州中胜物联网络科技有限公司 | Motoring condition observation circuit and monitoring method thereof |
| CN105564434B (en) * | 2014-10-09 | 2018-03-30 | 上海汽车集团股份有限公司 | The acquisition methods and device of a kind of engine condition |
| CN105092262B (en) * | 2015-07-13 | 2020-01-14 | 高新兴物联科技有限公司 | Vehicle start detection apparatus and method |
| CN105150957A (en) * | 2015-08-19 | 2015-12-16 | 大连楼兰科技股份有限公司 | OBD mode selection method and system based on vehicle operation state |
| CN105675304A (en) * | 2016-01-04 | 2016-06-15 | 杭州科技职业技术学院 | Automobile engine on-line monitoring system |
| CN105761325B (en) * | 2016-01-29 | 2018-01-16 | 大连楼兰科技股份有限公司 | It is adapted to vehicle ignition determination methods, the device and system of multi-vehicle-type |
| CN107741538B (en) * | 2017-09-11 | 2020-06-09 | 合肥移顺信息技术有限公司 | Self-adaptive virtual point flameout detection method based on voltage change of automobile storage battery |
| CN108089050A (en) * | 2017-12-14 | 2018-05-29 | 吉旗（成都）科技有限公司 | A kind of engine start detection method based on vehicle voltage variation |
| CN110901566B (en) * | 2018-09-18 | 2021-08-17 | 启碁科技股份有限公司 | Vehicle state monitoring system and vehicle state monitoring method |
| CN114856847B (en) * | 2022-04-20 | 2023-07-18 | 中联重科股份有限公司 | Control method for engineering equipment engine, processor and engineering equipment |
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| JP2007205841A (en) * | 2006-02-01 | 2007-08-16 | Mazda Motor Corp | Method for determining deterioration of battery |
| US8393201B2 (en) * | 2010-09-21 | 2013-03-12 | Webtech Wireless Inc. | Sensing ignition by voltage monitoring |
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| US6438487B1 (en) * | 2001-02-21 | 2002-08-20 | Ford Global Technologies, Inc. | Method and system for determining the operational state of a vehicle starter motor |
| CN1929239A (en) * | 2005-09-09 | 2007-03-14 | 株式会社电装 | Voltage control apparatus for electric generator of vehicle |
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