CN104697594A - General fuel consumption calculation method for automobile - Google Patents
General fuel consumption calculation method for automobile Download PDFInfo
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Abstract
The invention discloses a general fuel consumption calculation method for an automobile, and relates to the technical field of a method for measuring the liquid fuel flow for an engine. The method comprises the following steps: the value of OBD (on board diagnostics) II PID (proportional-integral-derivative) 0*10 is read, and the air flow m is calculated; the value of OBD II PID 0*11 is read, and the value of a standard oil injection rate n is obtained; the value of OBD II PID 0*7/9 is read, and a first modified fuel oil injection rate p1 is obtained; the value of OBD II PID 0*6/8 is read, and a second modified fuel oil injection rate p2 is obtained; the value of OBD II PID 5 is read, and a third modified fuel oil injection rate is calculated; the value of OBD II PID 10-13 is read, and a fourth modified fuel oil injection rate p4 is obtained. With adoption of the method, the fuel consumption for journey of a vehicle meeting the OBD II standard can be calculated accurately, a vehicle owner selects a more economic driving route conveniently, the coverage area is wide, configuration is not required for the owner, and the application is convenient.
Description
Technical field
The present invention relates to the method and technology field of the liquid fuel flow measuring engine, particularly relate to a kind of general automobile fuel consumption calculation method.
Background technology
OBD is as the abbreviation of a proper noun, and its full name is On Board Diagnostics, being meant to of Chinese: OBD.This cover system can in car running process the working condition of other functional module of Real-Time Monitoring engine electric-controlled system and vehicle, as being found work condition abnormality, then judge concrete fault according to specific algorithm, and be stored on intrasystem storer with the form of diagnostic trouble code (DTC) (DTC, Diagnostic Trouble Codes).The useful information obtained after system autodiagnosis can be offered help for the maintenance process simulation of vehicle, maintenance personal can utilize original factory of vehicle instrumentation read failure code, thus quick position can be carried out to fault, so that the repairing to vehicle, reduce the time of Artificial Diagnosis.
Due to the initial stage different vendor OBD system ask each does what he thinks is right, incompatible, so in order to seek unity of standard, AIAE American institute of automobile engineers (SAE, Society of Automotive Engineers) has formulated OBD-II standard in 1988.OBD-II carries out the trace routine of standard, and has strict discharge specific aim, for Real-Time Monitoring motor vehicle exhaust emission situation.As the system of a monitoring exhaust emissions, OBD starts the range of control expanding oneself gradually in development afterwards, and along with the various sensor of vehicle and the raising of electronic degree, every monitoring function has all been brought in the compass of competency of oneself by OBD.We mention OBD and generally can use this word of OBD interface now, because we can only see the transmission interface of this system on vehicle, but the aggregate of its whole vehicle control system in fact behind.
Early stage OBD interface uses the K-Line communication modes based on ISO agreement, is connected, because its semiduplex communication efficiency is lower, so this communication modes is substantially eliminated by the serial port of computer standard with external equipment.Technical progress in recent years makes new bus system also become main flow with regard to CAN-BUS communication modes, CAN-BUS employs the agreement based on ISO equally, but it belongs to network-type distribution, has very strong extensibility. the instruction 70/220/EEC 98/69/EC simultaneously come into force with Europe III from 2000 has also been worked out in Europe) annex XI.This instruction is applicable to Europe III and Europe IV Abgasgesetz, and content comprises: (1) all vehicles must equip OBD system, and its design, manufacture and installation should be able to guarantee that vehicle identifies types of degradation and fault type within the whole lifetime.
The vehicle that home market also starts all market of mandatory provision is sold in July, 2008 all must be equipped with this agreement, this agreement universal allows vehicle detection work obtain to simplify greatly, and a detector just can detect the vehicle of multiple brand.OBD interface is as the communication interface of vehicle-mounted monitoring system, except read failure code is for except repairing, primary function is exactly the various floor datas that can provide vehicle, except the data of vehicular meter display, reality recorded data in car running computer wants many, comprise a lot without the vehicle of car running computer display screen configuration, the data such as every oil consumption record, cell voltage, air-fuel ratio, throttle opening, pinking quantity all have record in systems in which in fact, can read the instantaneous oil consumption of Engine ECU in theory from OBD mouth.
But existing problem is, instantaneous oil consumption, definition is there is no in OBD II, because only for this car instrument and vehicle-mounted computer, different automobile types not the same year money design engineer, define the transmission mode of related data respectively, data layout, with the product walked panel board data mode and work it out, can only sell with special train dedicated mode, market is narrow and small; Or walk diagnostic equipment mode, to different automobile types not the same year money vehicle be equipped with different agreements, in use be configured (present maintenance depot used diagnostic equipment be namely utilize this mode) in advance, with high costs, and inconvenience is used for car owner.
Existing universal fuel consumption calculation method on the market, being calculate by reading the OBD II PID 0x23 defined in OBD mouth, utilizing A/F theoretical value to be that 14.7 these characteristics calculate, but one of prerequisite, be exactly engine be closed-loop control.And in fact, in order to meet the requirement of the various operating mode of engine, the air-fuel ratio of combination gas all can not adopt closed-loop control, but adopts the strategy that closed loop and open loop combine, add the reading error of mass air flow sensor, cause the actual error calculated very large.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of general automobile fuel consumption calculation method, by using described method, the vehicle meeting OBD II standard can calculate stroke oil consumption accurately, car owner is facilitated to select more economical traffic route, wide coverage, without the need to car owner's configuration, easy to use.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of general automobile fuel consumption calculation method, it is characterized in that described method comprises the steps:
(1) controller reads the value A1 of OBDII PID 0x10, and calculates air mass flow m according to formula A1*256/100, and now, on vehicle CAN BUS, the form of data is bytes; Or the value B1 of controller reading OBDII PID 0x10 calculates air mass flow m according to formula ((B1*256)+B1)/100, now, on vehicle CAN BUS, the form of data is two bytes, if the value of B1 is FF, then B1 value is invalid;
(2) controller reads the value A2 of OBD II PID 0x11, throttle position sensor numerical value t is obtained according to formula A2*100/255, if 90%>t>10%, if ideal air-fuel ratio r=14.7, if t>90%, then establish ideal air-fuel ratio r=13.23/t, if t<10%, then establish ideal air-fuel ratio r=15/ (1+t), calculate the ratio of air mass flow m and ideal air-fuel ratio r, obtain the value of standard injection rate n;
(3) controller reads value A3 and the A4 of OBDII PID 0x7/9, the fuel oil correction of engine cylinder group one and cylinder group two is obtained than k1 and k2 according to formula (A3-128) * 100/128 and formula (A4-128) * 100/128, then k1 and k2 is averaged, obtain the correction of average, long term fuel oil and compare k, according to formula n* (k+1), show that first time revises fuel oil ejection speed p1;
(4) controller reads value A5 and the A6 of OBD II PID 6/8, according to formula (A5-128) * 100/128 and formula (A6-128) * 100/128, calculate short-term fuel oil modified value h1 and the h2 of engine cylinder group one and cylinder group two, then h1 and h2 is averaged, show that h is compared in the correction of average short-term fuel oil, according to formula p1* (h+1), show that second time revises fuel oil ejection speed p2;
(5) controller reads the value A7 of OBD II PID5, water temperature C is calculated according to formula A7-40, if water temperature C is less than 90 DEG C, third time correction fuel oil ejection speed p3 is calculated according to formula [(90-C)/363+1] * p2, if water temperature C>90 DEG C, then calculate third time correction fuel oil ejection speed by p3=p2;
(6) controller reads the value of OBDII PID10-13, reads the value D1-D4 of engine 1-4 lambda sensor, does and on average draw mean values D, by formula (D/1023+1) p3, calculates the 4th fuel oil ejection speed p4;
(7) calculate integration with the 4th fuel oil ejection speed p4 with time t, draw stroke oil consumption fuel according to formula fuel=∫ f (p4) d (t) p4.
Further technical scheme is: described controller reads the correlation in OBDII by CAN-BUS.
The beneficial effect adopting technique scheme to produce is: by using described method, the vehicle meeting OBD II standard can calculate stroke oil consumption accurately, facilitates car owner to select more economical traffic route, wide coverage, without the need to car owner's configuration, easy to use.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
Theoretical foundation:
A, lambda sensor have a kind of characteristic, and lambda sensor feeds back the concentration information of combination gas to ECU by the content that detects oxygen in engine exhaust, it be arranged on three-way catalyst before gas outlet on.The voltage that it exports near air-fuel ratio has sudden change.This characteristic is used to detect the concentration of oxygen in exhaust and feedback to the computer, to control air-fuel ratio.When actual mixing ratio uprises, in exhaust oxygen concentration increase and lambda sensor state (little electromotive force: O lie prostrate) rare for combination gas notify ECU.When air-fuel ratio is lower than chemically correct fuel, in exhaust, the concentration of oxygen reduces, and the state of lambda sensor (large electromotive force: 1 volt) notice (ECU) computer.ECU judges the low or high of air-fuel ratio according to the electromotive force difference from lambda sensor, and correspondingly controls the time of fuel injection duration.
B, fugitive fuel oil correction are a kind of control programs.After pcm enters closed loop control operations, utilize fuel system watch-dog check and adjust fugitive and long-acting value.Will round-the-clockly run once PCM enters close loop maneuver fuel system watch-dog.PCM monitors the current state of fuel oil supply system and compared with the ideal value this numerical value and fuel injection control strategy determined.If need to carry out fine setting PCM to distributive value just increase or reduce STFT (fugitive fuel oil correction).The reason of carrying out finely tuning is because the variant generation of ideal value of the current real-time value of fuel oil supply system and strategy decision departs from.It is very important that fuel oil modified value is seen by Pcm, for all comprising in all freezing data frame data that any one diagnostic trouble code stores and (long-acting fuel oil correction).Simple understanding is exactly that engine operation is being burnt exactly.But fuel mixes with air must have a ratio the most rational.If store in computer memory this rational ratio value he be .. fuel oil because certain reason straying quatity excessive or little be all that irrational computer needs to carry out suitable adjustment to fuel injection pulse width.That fugitive fuel oil correction is exactly the instrument that computer carries out regulating.Whether correct effect as adjustment is or say that differing this with standard just has a value of measuring and symbol to represent.If data stream displayed value illustrates that existing fuel mixture slightly rare control system compared with theoretical value in systems in which carries out enriching.That adds the integrator how much just representing and add this representation unit and come from.Its method for expressing is that the number used represents.0 is desired quantity, be namely less than 0 expression and system display combination gas dense needs subtract oil with compared with needs subtract.Be greater than 0 use and represent that illustrative system combination gas rare needs increases fuel oil.System attempts mixture ratio of fuel to oil to adjust to perfect condition all the time thus normal correction state is this number be ceaselessly change make great efforts close
C, long-term fuel oil adjusted value are obtained by short-term fuel oil adjusted value, and represent the long-term modified value of fuel oil deviation.If long-term fuel oil adjustment display 0% represents the air-fuel ratio keeping PCM to control, fuel delivery is just right; If long-term fuel oil adjustment display is negative value lower than 0%, then show combination gas overrich, distributive value reduces (fuel injection pulsewidth reduction); If long-term fuel oil adjustment display be higher than 0% on the occasion of, then show that combination gas is excessively rare, PCM compensates by increasing fuel delivery (fuel injection pulsewidth increase).The numerical value of long-term fuel oil adjustment can represent power train control module compensate for how many.Although the adjustment of short-term fuel oil frequently can carry out the wider a small amount of adjustment of scope to fuel supply volume, long-term fuel oil adjustment can indicate the trend of short-term fuel oil adjustment to thin or dense thick direction adjustment.Long-term fuel oil adjustment can change fuel delivery by towards required direction after extended periods significantly.
D, gasoline air mixture ratio are relevant with coolant water temperature, and along with temperature increases, air-fuel ratio becomes large gradually.Automobile distributive value control, be mainly divided into three kinds of control modes: cold start and cooling water temperature low time usually adopt open loop control mode.Because starting speed is low, cooling water temperature is low, fuel evaporability is poor, certain compensation need be carried out to fuel oil.Gasoline air mixture ratio is relevant with cooling water temperature, and along with temperature increases, air-fuel ratio becomes large gradually.Sub-load and idle time now can be divided into two kinds of situations: if acquisition Best Economy, can open loop control mode be adopted, air-fuel ration control is worked under the lean mixture state larger than stoichiometric proportion.In order to obtain low discharge, and there is good fuel economy, electronically controlled fuel injection system must be adopted to add three-way catalytic converter, carry out air-fuel ratio closed-loop control.Time WOT (WOT): in order to obtain maximum engine capacity and prevent engine overheat, adopt opened loop control, gasoline air mixture ratio is controlled in 12.5 ~ 13.5 scopes.Now in engine, mixture combustion is fastest, and combustion pressure is the highest, and thus output power is also larger.
Lambda sensor, water temperature inductor, throttle position sensor, be the parts that all vehicles all have, and above parameter all has definition in ISO15031, belongs to normal data, and most vehicle can read from OBD mouth.
A, short-term fuel oil correction actual value can be calculated by PID 06/08, (A-128) * 100/128, and pid value is greater than 128 expression combination gass by enriching, are less than and represent that fuel oil is subtracted rare.Long-term fuel oil correction actual value can be calculated from PID 07/09, and actual value (percentage) equals (A-128) * 100/128, and pid value is greater than 128 expression combination gass by enriching, is less than 128 expression fuel oils and is subtracted rare.
B, lambda sensor reading can calculate from PID 14-1B, and actual value equals (A/200+ (B-128) * 100/128); Water temperature can be calculated by PID 05, and actual system equals A-40; Throttle position can be calculated from PID 11, and actual aperture (number percent) is A*100/255, and cooling-water temperature sensor is calculated by PID 05, and actual value equals A-40 (degree Celsius).
According to the same characteristic of above data, calculate distributive value modified value in real time, revise the instantaneous distributive value of automobile, be that transverse axis carries out integration with time by instantaneous distributive value, draw stroke fuel consumption.
Therefore the method for the invention is as follows: the invention discloses a kind of general automobile fuel consumption calculation method as described in Figure 1, described method comprises the steps:
(1) controller reads the value A1 of OBDII PID 0x10, and calculates air mass flow m according to formula A1*256/100, and now, on vehicle CAN BUS, the form of data is bytes; Or the value B1 of controller reading OBDII PID 0x10 calculates air mass flow m according to formula ((B1*256)+B1)/100, now, on vehicle CAN BUS, the form of data is two bytes, if the value of B1 is FF, then B1 value is invalid;
(2) controller reads the value A2 of OBD II PID 0x11, throttle position sensor numerical value t is obtained according to formula A2*100/255, if 90%>t>10%, if ideal air-fuel ratio r=14.7, if t>90%, then establish ideal air-fuel ratio r=13.23/t, if t<10%, then establish ideal air-fuel ratio r=15/ (1+t), calculate the ratio of air mass flow m and ideal air-fuel ratio r, obtain the value of standard injection rate n;
(3) controller reads value A3 and the A4 of OBDII PID 0x7/9, the fuel oil correction of engine cylinder group one and cylinder group two is obtained than k1 and k2 according to formula (A3-128) * 100/128 and formula (A4-128) * 100/128, then k1 and k2 is averaged, obtain the correction of average, long term fuel oil and compare k, according to formula n* (k+1), show that first time revises fuel oil ejection speed p1;
(4) controller reads value A5 and the A6 of OBD II PID 6/8, according to formula (A5-128) * 100/128 and formula (A6-128) * 100/128, calculate short-term fuel oil modified value h1 and the h2 of engine cylinder group one and cylinder group two, then h1 and h2 is averaged, show that h is compared in the correction of average short-term fuel oil, according to formula p1* (h+1), show that second time revises fuel oil ejection speed p2;
(5) controller reads the value A7 of OBD II PID5, water temperature C is calculated according to formula A7-40, if water temperature C is less than 90 DEG C, third time correction fuel oil ejection speed p3 is calculated according to formula [(90-C)/363+1] * p2, if water temperature C>90 DEG C, then calculate third time correction fuel oil ejection speed by p3=p2;
(6) controller reads the value of OBDII PID10-13, reads the value D1-D4 of engine 1-4 lambda sensor, does and on average draw mean values D, by formula (D/1023+1) p3, calculates the 4th fuel oil ejection speed p4;
(7) calculate integration with the 4th fuel oil ejection speed p4 with time t, draw stroke oil consumption fuel according to formula fuel=∫ f (p4) d (t) p4.
Feature of the present invention is not calculate stroke oil consumption by instantaneous oil consumption, because instantaneous oil consumption is that Engine ECU distributive value is divided by the speed of a motor vehicle, again divided by the time, so the instantaneous oil consumption that panel board shows is inaccurate (have two factors, one is speed of a motor vehicle error, another one does the approximate number of division, for the same B of A, be exactly the form of data on vehicle CAN BUS, if a byte, be exactly A, if two bytes, be exactly the same B of A, if the value of B is FF, then B value is invalid, in the SAEJ1979 specification that related definition defines at Society of automotive engineers.
By using described method, the vehicle meeting OBD II standard can calculate stroke oil consumption accurately, facilitates car owner to select more economical traffic route, wide coverage, without the need to car owner's configuration, easy to use.
Claims (2)
1. a general automobile fuel consumption calculation method, is characterized in that described method comprises the steps:
(1) controller reads the value A1 of OBDII PID 0x10, and calculates air mass flow m according to formula A1*256/100, and now, on vehicle CAN BUS, the form of data is bytes; Or the value B1 of controller reading OBDII PID 0x10 calculates air mass flow m according to formula ((B1*256)+B1)/100, now, on vehicle CAN BUS, the form of data is two bytes, if the value of B1 is FF, then B1 value is invalid;
(2) controller reads the value A2 of OBD II PID 0x11, throttle position sensor numerical value t is obtained according to formula A2*100/255, if 90%>t>10%, if ideal air-fuel ratio r=14.7, if t>90%, then establish ideal air-fuel ratio r=13.23/t, if t<10%, then establish ideal air-fuel ratio r=15/ (1+t), calculate the ratio of air mass flow m and ideal air-fuel ratio r, obtain the value of standard injection rate n;
(3) controller reads value A3 and the A4 of OBDII PID 0x7/9, the fuel oil correction of engine cylinder group one and cylinder group two is obtained than k1 and k2 according to formula (A3-128) * 100/128 and formula (A4-128) * 100/128, then k1 and k2 is averaged, obtain the correction of average, long term fuel oil and compare k, according to formula n* (k+1), show that first time revises fuel oil ejection speed p1;
(4) controller reads value A5 and the A6 of OBD II PID 6/8, according to formula (A5-128) * 100/128 and formula (A6-128) * 100/128, calculate short-term fuel oil modified value h1 and the h2 of engine cylinder group one and cylinder group two, then h1 and h2 is averaged, show that h is compared in the correction of average short-term fuel oil, according to formula p1* (h+1), show that second time revises fuel oil ejection speed p2;
(5) controller reads the value A7 of OBD II PID5, water temperature C is calculated according to formula A7-40, if water temperature C is less than 90 DEG C, third time correction fuel oil ejection speed p3 is calculated according to formula [(90-C)/363+1] * p2, if water temperature C>90 DEG C, then calculate third time correction fuel oil ejection speed by p3=p2;
(6) controller reads the value of OBDII PID10-13, reads the value D1-D4 of engine 1-4 lambda sensor, does and on average draw mean values D, by formula (D/1023+1) p3, calculates the 4th fuel oil ejection speed p4;
(7) calculate integration with the 4th fuel oil ejection speed p4 with time t, draw stroke oil consumption fuel according to formula fuel=∫ f (p4) d (t) p4.
2. general automobile fuel consumption calculation method according to claim 1, is characterized in that: described controller reads the correlation in OBDII by CAN-BUS.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105069860A (en) * | 2015-07-29 | 2015-11-18 | 厦门雅迅网络股份有限公司 | Method for vehicle oil consumption statistics |
| CN107798155A (en) * | 2016-09-05 | 2018-03-13 | 深圳驾图通信技术有限公司 | Vehicle monitoring method and system |
| CN110056442A (en) * | 2018-01-18 | 2019-07-26 | 广州车轱辘网络科技有限公司 | Based on the accurate fuel consumption calculation method of general automobile under big data correction mode |
| CN112046762A (en) * | 2020-09-07 | 2020-12-08 | 南京航空航天大学 | Turboprop engine-based hybrid unmanned aerial vehicle and take-off and landing control method thereof |
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