CN102889993B - Method and system for testing engine fuel consumption characteristics - Google Patents
Method and system for testing engine fuel consumption characteristics Download PDFInfo
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- CN102889993B CN102889993B CN201210384656.9A CN201210384656A CN102889993B CN 102889993 B CN102889993 B CN 102889993B CN 201210384656 A CN201210384656 A CN 201210384656A CN 102889993 B CN102889993 B CN 102889993B
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Abstract
The invention relates to the engine test field, and discloses a method and system for testing engine fuel consumption characteristics. The method comprises the following steps: acquiring universal characteristics curves of an engine at each transient factor, wherein the transient factor is used to characterize transient degree of the engine; acquiring a probability distribution of each transient factor based on loop data; taking the probability distribution of each transient factor as a weight, and stacking in a weighted manner the universal characteristics curves at each transient factor to obtain the engine fuel consumption characteristics. According to the embodiment, a probability distribution weight of each transient factor of the engine is extracted by analyzing the loop data, meanwhile, the universal characteristics curves of the engine at each transient factor are acquired through the test, and then the universal characteristics curves are stacked at each transient factor, so as to obtain the combined fuel consumption characteristics of the engine in the steady state and the transient state, and further obtain the engine economy evaluation result which meets the actual road operating work condition according to the fuel consumption characteristics.
Description
Technical field
The present invention relates to Engine Block Test field, especially relate to a kind of engine consumption characteristic test method and system.
Background technology
Different engines has different oil consumption.The oil consumption characteristic of engine, typical i.e. specific power oil consumption is the most important index of engine evaluated economy.In the prior art, in order to the economy by oil consumption engine evaluated, a kind of scheme adopts the oil consumption of calibration point or maximum torque point to evaluate.But because engine can not be in a certain operating point work always, so the evaluation result of this scheme is very inaccurate.
Another kind of improved plan adopts universal characteristic curve to represent.Universal characteristic curve is called for short ten thousand Tequ lines, is a kind of family curve of multiparameter, take rotating speed as transverse axis, and mean effective pressure or moment of torsion are the longitudinal axis, by the correlated performance waiting oil consumption line or equipower line to represent engine.Stable state and transient state are two Common Concepts describing operating mode residing for engine, and universal characteristic measures under steady state operating conditions to obtain.Inventor is realizing finding in process of the present invention, analyze known according to road modal data, engine overwhelming majority operating condition is all with transient state to a certain degree, universal characteristic under such steady state condition can not oil consumption characteristic accurately under engine evaluated transient condition, in other words this scheme only considered steady state condition and does not consider the situation of transient condition, has departed from true environment.Visible, lacking one in prior art all the time can be undertaken comprehensively by engine steady state and transient condition, obtains the method for engine comprehensive specific power oil consumption, also just cannot the economy of engine evaluated accurately.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of engine consumption characteristic test method and system, to obtain the comprehensive oil consumption characteristic of engine under stable state and transient state.
On the one hand, the embodiment of the invention discloses a kind of engine consumption characteristic test method, described method comprises:
Obtain the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine;
The probability distribution of each transient state factor according to the general data acquisition in road;
Using the probability distribution of each transient state factor described as weights, superposition is weighted to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.
Preferably, the universal characteristic curve of the described engine of described acquisition under each transient state factor, specifically comprises:
By regulating the air inflow of described engine to simulate transient condition, to obtain the universal characteristic curve of described engine under each transient state factor.
Preferably, described by regulating the air inflow of described engine to simulate transient condition, specifically comprise:
Bench test is carried out to described engine, on air inlet pipeline, an adjustable valve is installed during test, is regulated the air inflow of described engine by control valve, to simulate transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor.
On the other hand, the embodiment of the invention also discloses a kind of engine consumption characteristic test system, described system comprises:
Ten thousand Tequ line acquiring units, for obtaining the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine;
Transient state factor distribution acquiring unit, for the probability distribution of each transient state factor according to the general data acquisition in road;
Weighted stacking unit, for using the probability distribution of each transient state factor described as weights, superposition is weighted to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.
Preferably, described ten thousand Tequ line acquiring units specifically comprise:
Work condition analogue subelement, for by regulating the air inflow of described engine to simulate transient condition;
Ten thousand special curve acquisition subelements, for obtaining the universal characteristic curve of described engine under each transient state factor.
Preferably, described Work condition analogue subelement specifically comprises:
Bench test subelement, for carrying out bench test to described engine, installs an adjustable valve during test on air inlet pipeline;
Valve regulated subelement, for the air inflow by regulating described valve to regulate described engine, to simulate transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor.
The embodiment of the present invention extracts the probability distribution weights of each transient state factor of engine by analyzing road modal data, obtain the universal characteristic curve of engine under each transient state factor by test simultaneously, then superpose according to the ten thousand Tequ lines of weights by each transient state factor, thus the comprehensive oil consumption characteristic of engine under stable state and transient state can be obtained, according to this oil consumption characteristic and then the engine Economic Evaluation result that can obtain realistic road operating condition.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the embodiment of the present invention one method;
Fig. 2 is the process flow diagram of the embodiment of the present invention two method;
Fig. 3 is the oil consumption universal curve schematic diagram when transient state factor is 0.1 in the embodiment of the present invention two;
Fig. 4 is transient state factor probability distribution schematic diagram in the embodiment of the present invention two;
Fig. 5 is oil consumption universal curve schematic diagram after weighting in the embodiment of the present invention two;
Fig. 6 is the schematic diagram of the embodiment of the present invention three system.
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 the present invention's part embodiment, 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.
Embodiment one
See Fig. 1, it is the process flow diagram of the embodiment of the present invention one method.This embodiment offers a kind of engine consumption characteristic test method, described method comprises:
S101: obtain the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine.The current evaluation to engine economy mainly according to the universal characteristic under steady state condition, and always with transient state to a certain degree when engine runs on real road, now adopts the evaluation method of stable state can not accurately represent its economy.Transient condition is that engine is by the transient process of an operating mode to another operating mode.In order to better characterize the state residing for engine, by the transient state degree of transient state because of sub-definite engine.Engine transient performance can embody from the size of the transient state factor, and generally the transient state factor equals 0 and represents that now engine is in steady state condition, and the transient state factor is greater than 0 expression, and it is in transient condition.Concrete, air inflow can be adopted to define the transient condition of engine, can obtain the air inflow AFS_mSteady under engine steady state operating condition according to rotating speed, oil mass, admission pressure and intake air temperature, and the real-time air inflow of engine is AFS_mTrans, then the transient state factor is:
The transient state factor equals 0, represents that engine is in steady state operating condition; The transient state factor equals 1, then represent that engine is in the transient condition of 100%.
It is more than a kind of formula given by transient state factor representation transient state degree of exemplary.In other embodiments of the present invention, the transient state factor can also be defined by other formula, as long as the transient state degree of engine can be reflected, this embodiment of the present invention not limited.
Preferably, the universal characteristic curve of the described engine of described acquisition under each transient state factor, specifically can comprise:
By regulating the air inflow of described engine to simulate transient condition, to obtain the universal characteristic curve of described engine under each transient state factor.
Preferred, described by regulating the air inflow of described engine to simulate transient condition further, specifically can comprise:
Bench test is carried out to described engine, on air inlet pipeline, an adjustable valve is installed during test, is regulated the air inflow of described engine by control valve, to simulate transient condition.
S102: the probability distribution of each transient state factor according to the general data acquisition in road.Road modal data belongs to Common Concepts, and being basic parameter feature when engine real road runs, is also the information gathered on car load as required.Based on the analysis of general data of satisfying the need, the probability distribution that engine is in various transient state degree can be obtained.In addition, be understandable that, this step and S101 there is no precedence relationship, in other embodiments of the present invention, also can first carry out S102 and carry out S101 again.
S103: using the probability distribution of each transient state factor described as weights, is weighted superposition to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.After the process of previous step, there is the universal characteristic curve under each transient state factor, also had the weights of each transient state factor simultaneously, so passed through weighted stacking and observations, engine consumption characteristic can be obtained, and then can the economy of engine evaluated.
Embodiment two
Below on the basis of embodiment one, in conjunction with concrete scene, the present invention is described further.Fig. 2 is the process flow diagram of the embodiment of the present invention two method, comprises the following steps:
On the one hand:
S201: determine the transient state factor.Current engine electric-controlled unit can calculate the corresponding transient state factor according to the running status that engine is real-time, can define the transient state degree of engine operation now according to the transient state factor.First demarcate the transient condition that relevant MAP defines engine, represented the transient state degree of engine by transient state factor CoEng_facTrans.MAP Chinese claims arteries and veins spectrum, is three-dimensional tables of data, can searches z-axis data according to x-axis and y-axis.
S202: make air inflow adjustable, to simulate transient condition.In the present embodiment, in order to realize the controllability of air inflow, universal characteristic test is different from conventional test, but some changes have been done to bench test, air inlet pipeline installs an adjustable valve, for controlling air inflow, by regulating this valve can simulated engine transient condition.
S203: carry out bench test.Determine the transient state factor and after having carried out transforming to air inlet pipeline, just can carry out bench test.
S204: the universal characteristic curve drawing the different transient factor.The numerical value of the current instantaneous factor can be read by instrument, also can change the transient state factor by regulating measure as controlled air inflow simultaneously.In the present embodiment, control valve makes the transient state factor be increased to 1 with 0.1 for step-length from 0 always, and draws a universal characteristic MAP under each transient state factor in these 11 transient state factors.Fig. 3 is an oil consumption universal curve exemplary plot.
On the other hand:
S205: road modal data gathers, analysis.Analyze the transient state factor in engine actual moving process and be in the probability distribution of varying level, draw the probability distribution graph of response.
S206: obtain different transient degree probability distribution.Determine the weight shared by the universal MAP that different transient factor pair is answered according to the probability distribution of the engine transient factor in the modal data of road, in step so below, just can be represented the economy of engine whole service operating mode by 11 MAP superpositions.The transient state factor probability distribution schematic diagram of certain driving cycle intrinsic motivation can be shown in Figure 4.
Then:
S207: multiple universal MAP are according to different weighted superposition.Analyze gained transient state degree probability distribution graph according to road modal data, obtain the weight of the different transient factor, then the universal characteristic MAP that second step is drawn is weighted with corresponding transient state Factor Weight, then superposes, namely can be used for the economy of expression engine.
Such as, when evaluating oil consumption, such as a certain operating mode (1000 turns of 50mg distributive values), the numerical value of the transient state factor is splashed when engine is in this operating mode, the transient state factor can be made to change to 1 from 0 interval 0.1 at this operating point by bench test, so just can record 11 data, 11 data just can be used for evaluating the comprehensive oil consumption of this operating point according to different weighted superposition.The weight of such as 11 points can be impartial, all equals 1/11, also can be unequal, as long as total number percent add up and equal 1 just passable.Schematic diagram after many oil consumption universal characteristic curve weighted stacking can be shown in Figure 5.So just, comprehensive oil consumption characteristic can be got.
S208: according to comprehensive oil consumption evaluating characteristics engine economy.Because road environment that is virtually reality like reality in whole process of the test, so the embodiment of the present invention can obtain engine economy evaluation result more accurately.
Embodiment three
Shown in Figure 6, present embodiment discloses a kind of engine consumption characteristic test system, described system comprises:
Ten thousand Tequ line acquiring units 601, for obtaining the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine;
Transient state factor distribution acquiring unit 602, for the probability distribution of each transient state factor according to the general data acquisition in road;
Weighted stacking unit 603, for using the probability distribution of each transient state factor described as weights, superposition is weighted to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.
Preferably, described ten thousand Tequ line acquiring units 601 specifically can comprise:
Work condition analogue subelement, for by regulating the air inflow of described engine to simulate transient condition;
Ten thousand special curve acquisition subelements, for obtaining the universal characteristic curve of described engine under each transient state factor.
Preferably, described Work condition analogue subelement specifically can comprise:
Bench test subelement, for carrying out bench test to described engine, installs an adjustable valve during test on air inlet pipeline;
Valve regulated subelement, for the air inflow by regulating described valve to regulate described engine, to simulate transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor.
For system embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.System embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement
The present invention can describe in the general context of computer executable instructions, such as program module.Usually, program module comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the present invention in a distributed computing environment, in these distributed computing environment, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium comprising memory device.
One of ordinary skill in the art will appreciate that all or part of step realized in said method embodiment is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM, RAM, magnetic disc, CD etc.
Also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Apply specific case herein to have carried out lock to principle of the present invention and embodiment and state, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (6)
1. an engine consumption characteristic test method, is characterized in that, described method comprises:
Obtain the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine, and the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor;
The probability distribution of each transient state factor according to the general data acquisition in road;
Using the probability distribution of each transient state factor described as weights, superposition is weighted to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.
2. method according to claim 1, is characterized in that, the universal characteristic curve of the described engine of described acquisition under each transient state factor, specifically comprises:
By regulating the air inflow of described engine to simulate transient condition, to obtain the universal characteristic curve of described engine under each transient state factor.
3. method according to claim 2, is characterized in that, described by regulating the air inflow of described engine to simulate transient condition, specifically comprises:
Bench test is carried out to described engine, on air inlet pipeline, an adjustable valve is installed during test, is regulated the air inflow of described engine by control valve, to simulate transient condition.
4. an engine consumption characteristic test system, is characterized in that, described system comprises:
Ten thousand Tequ line acquiring units, for obtaining the universal characteristic curve of described engine under each transient state factor, the described transient state factor is for characterizing the transient state degree of engine, and the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor;
Transient state factor distribution acquiring unit, for the probability distribution of each transient state factor according to the general data acquisition in road;
Weighted stacking unit, for using the probability distribution of each transient state factor described as weights, superposition is weighted to the universal characteristic curve under each transient state factor described, obtains described engine consumption characteristic.
5. system according to claim 4, is characterized in that, described ten thousand Tequ line acquiring units specifically comprise:
Work condition analogue subelement, for by regulating the air inflow of described engine to simulate transient condition;
Ten thousand special curve acquisition subelements, for obtaining the universal characteristic curve of described engine under each transient state factor.
6. system according to claim 5, is characterized in that, described Work condition analogue subelement specifically comprises:
Bench test subelement, for carrying out bench test to described engine, installs an adjustable valve during test on air inlet pipeline;
Valve regulated subelement, for the air inflow by regulating described valve to regulate described engine, to simulate transient condition.
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| CN103969048B (en) * | 2014-02-18 | 2016-12-07 | 潍柴动力股份有限公司 | A kind of point selection of operating conditions method and device |
| CN109115502B (en) * | 2018-08-22 | 2020-07-24 | 安徽江淮汽车集团股份有限公司 | Engine universal characteristic detection method and module |
| CN109738191B (en) * | 2019-01-11 | 2020-08-25 | 北京三一智造科技有限公司 | Engine health state evaluation method and system |
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| CN101069082A (en) * | 2004-12-03 | 2007-11-07 | 日野自动车株式会社 | Transient engine performance adaptation method and system |
| GB2489821A (en) * | 2011-04-06 | 2012-10-10 | Lysanda Ltd | Estimating fuel consumption of a vehicle |
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