CN102889993A - 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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- CN102889993A CN102889993A CN2012103846569A CN201210384656A CN102889993A CN 102889993 A CN102889993 A CN 102889993A CN 2012103846569 A CN2012103846569 A CN 2012103846569A CN 201210384656 A CN201210384656 A CN 201210384656A CN 102889993 A CN102889993 A CN 102889993A
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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 the 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 typically is the specific power oil consumption, is the most important index of engine evaluated economy.In the prior art, for the economy by the oil consumption engine evaluated, a kind of scheme is to adopt the oil consumption of calibration point or maximum torque point to estimate.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 is to adopt universal characteristic curve to represent.Universal characteristic curve is called for short ten thousand Tequ lines, is a kind of family curve of multiparameter, and take rotating speed as transverse axis, mean effective pressure or moment of torsion are the longitudinal axis, represents the correlated performance of engine by waiting oil consumption line or equipower line.Stable state and transient state are to describe two Common Concepts of engine operating mode of living in, and universal characteristic is to measure under steady state condition.The inventor finds in realizing process of the present invention, according to road spectrum data analysis as can be known, engine overwhelming majority operating conditions are all with to a certain degree transient state, the such oil consumption characteristic under the engine evaluated transient condition accurately of the universal characteristic under the steady state condition, in other words this scheme has only been considered steady state condition and has not been considered the situation of transient condition, has broken away from true environment.As seen, lack all the time a kind of engine steady state and transient condition can being carried out comprehensively in the prior art, obtain the method for the comprehensive specific power oil consumption of engine, also the economy of engine evaluated accurately just.
Summary of the invention
In view of this, the purpose of the embodiment of the invention provides 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 used for characterizing the transient state degree of engine;
Probability distribution according to described each transient state factor of the general data acquisition in road;
The probability distribution of described each transient state factor as weights, is weighted stack to the universal characteristic curve under described each transient state factor, obtains described engine consumption characteristic.
Preferably, the described universal characteristic curve of described engine under each transient state factor that obtain specifically comprises:
Simulate transient condition by the air inflow of regulating described engine, to obtain the universal characteristic curve of described engine under each transient state factor.
Preferably, describedly simulate transient condition by the air inflow of regulating described engine, specifically comprise:
Described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test, the air inflow of regulating described engine by control valve is with the simulation transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under the 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 are used for obtaining the universal characteristic curve of described engine under each transient state factor, and the described transient state factor is used for characterizing the transient state degree of engine;
Transient state factor distributed acquisition unit is used for the probability distribution according to described each transient state factor of the general data acquisition in road;
The weighted stacking unit is used for probability distribution with described each transient state factor as weights, and the universal characteristic curve under described each transient state factor is weighted stack, obtains described engine consumption characteristic.
Preferably, described ten thousand Tequ line acquiring units specifically comprise:
The Work condition analogue subelement is used for simulating transient condition by the air inflow of regulating described engine;
Ten thousand Tequ lines obtain subelement, are used for obtaining the universal characteristic curve of described engine under each transient state factor.
Preferably, described Work condition analogue subelement specifically comprises:
The bench test subelement is used for described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test;
The valve regulated subelement is for the air inflow of regulating described engine by regulating described valve, with the simulation transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under the 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 invention extracts the probability distribution weights of each transient state factor of engine by analyzing road spectrum 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 with each transient state factor, thereby can obtain the comprehensive oil consumption characteristic of engine under stable state and transient state, according to this oil consumption characteristic and then can obtain the engine Economic Evaluation result of realistic road operating condition.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the process flow diagram of the embodiment of the invention one method;
Fig. 2 is the process flow diagram of the embodiment of the invention two methods;
Fig. 3 is that the transient state factor is 0.1 o'clock oil consumption universal curve schematic diagram in the embodiment of the invention two;
Fig. 4 is transient state factor probability distribution schematic diagram in the embodiment of the invention two;
Fig. 5 is oil consumption universal curve schematic diagram after the weighting in the embodiment of the invention two;
Fig. 6 is the schematic diagram of the embodiment of the invention three systems.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment one
Referring to Fig. 1, be the process flow diagram of the embodiment of the invention one method.This embodiment provides a kind of engine consumption characteristic test method, and described method comprises:
S101: obtain the universal characteristic curve of described engine under each transient state factor, the described transient state factor is used for characterizing the transient state degree of engine.At present to the evaluation of engine economy mainly according to the universal characteristic under the steady state condition, and engine when real road move always with to a certain degree transient state, adopt the evaluation method of stable state can accurately not represent its economy at this moment.Transient condition is that engine is by the transient process of an operating mode to another operating mode.In order better to characterize the residing state of engine, with the transient state degree of transient state factor definition engine.The engine transient performance can embody from the size of the transient state factor, generally speaking the transient state factor equal 0 expression this moment engine be in steady state condition, it is in transient condition to the transient state factor greater than 0 expression.Concrete, can adopt the transient condition of air inflow definition engine, can obtain air inflow AFS_mSteady under the 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, and the expression engine is in steady state operating condition; The transient state factor equals 1, represents that then engine is in 100% transient condition.
More than just exemplary provided a kind of formula with transient state factor representation transient state degree.In other embodiments of the invention, can also define the transient state factor by other formula, get final product so long as can reflect the transient state degree of engine, this embodiment of the invention is not limited.
Preferably, the described universal characteristic curve of described engine under each transient state factor that obtain specifically can comprise:
Simulate transient condition by the air inflow of regulating described engine, to obtain the universal characteristic curve of described engine under each transient state factor.
Further preferred, describedly simulate transient condition by the air inflow of regulating described engine, specifically can comprise:
Described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test, the air inflow of regulating described engine by control valve is with the simulation transient condition.
S102: according to the probability distribution of described each transient state factor of the general data acquisition in road.Spectrum data in road belong to Common Concepts, are the basic parameter features during operation on the engine real road, also are the information that gathers at car load as required.Based on the analysis of the general data of satisfying the need, can obtain the probability distribution that engine is in various transient state degree.In addition, be understandable that, this step there is no precedence relationship with S101, in other embodiments of the invention, also can carry out first S102 and carry out S101 again.
S103: the probability distribution of described each transient state factor as weights, is weighted stack to the universal characteristic curve under described each transient state factor, obtains described engine consumption characteristic.Through after the processing of top step, universal characteristic curve under each transient state factor has been arranged, also had simultaneously the weights of each transient state factor, so by weighted stacking and observations, can obtain the engine consumption characteristic, and then economy that can engine evaluated.
Embodiment two
The below is described further the present invention in conjunction with concrete scene on the basis of embodiment one.Fig. 2 is the process flow diagram of the embodiment of the invention two methods, may further comprise the steps:
On the one hand:
S201: determine the transient state factor.Engine electric-controlled unit can calculate the corresponding transient state factor according to the real-time running status of engine at present, can define the transient state degree of the engine operation of this moment according to the transient state factor.At first demarcate the transient condition that relevant MAP defines engine, represent the transient state degree of engine by transient state factor CoEng_facTrans.MAP Chinese claims the arteries and veins spectrum, is three-dimensional tables of data, can search the z axis data according to x axle and y axle.
S202: air inflow can be regulated, with the simulation transient condition.In the present embodiment, in order to realize the controllability of air inflow, the universal characteristic test is different from conventional test, but some changes have been done in bench test, at air inlet pipeline one adjustable valve is installed, is used for the control air inflow, can the simulated engine transient condition by regulating this valve.
S203: carry out bench test.After having determined the transient state factor and air inlet pipeline having been carried out transforming, just can carry out bench test.
S204: the universal characteristic curve of drawing the different transient factor.The numerical value of the current transient state factor is to read by instrument, also can change the transient state factor such as the control air inflow by regulating measure simultaneously.In the present embodiment, control valve makes the transient state factor be increased to 1 since 0 take 0.1 as step-length always, and draws a universal characteristic MAP under each the 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 spectrum data acquisition, analysis.The transient state factor is in the probability distribution of varying level in the analysis engine actual moving process, draws the probability distribution graph of response.
S206: obtain different transient degree probability distribution.Probability distribution according to the engine transient factor in the spectrum data of road determines the shared weight of universal MAP figure that the different transient factor pair is answered, and just can superpose to represent by 11 MAP the economy of engine whole service operating mode in the step so below.The transient state factor probability distribution schematic diagram of certain driving cycle intrinsic motivation can be referring to shown in Figure 4.
Then:
S207: many universal MAP superpose according to different weights.According to road spectrum data analysis gained transient state degree probability distribution graph, obtain the weight of the different transient factor, the universal characteristic MAP that then second step is drawn is weighted with corresponding transient state factor weight, then superposes, and namely can be used for representing the economy of engine.
For example, when estimating oil consumption, for example for a certain operating mode (1000 turn the 50mg distributive value), when being in this operating mode, engine splashs the numerical value of the transient state factor, can make the transient state factor 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 estimating the comprehensive oil consumption of this operating point according to different weight stacks.Can be impartial such as the weight of 11 points, all equal 1/11, also can be unequal, as long as adding up, total number percent equals 1 just passable.Schematic diagram after many oil consumption universal characteristic curve weighted stacking can be referring to shown in Figure 5.So just, can get access to comprehensive oil consumption characteristic.
S208: according to comprehensive oil consumption evaluating characteristics engine economy.Because road environment that is virtually reality like reality in the whole process of the test, so the embodiment of the invention can obtain engine economy evaluation result more accurately.
Embodiment three
Referring to shown in Figure 6, the present embodiment discloses a kind of engine consumption characteristic test system, and described system comprises:
Ten thousand Tequ line acquiring units 601 are used for obtaining the universal characteristic curve of described engine under each transient state factor, and the described transient state factor is used for characterizing the transient state degree of engine;
Transient state factor distributed acquisition unit 602 is used for the probability distribution according to described each transient state factor of the general data acquisition in road;
Weighted stacking unit 603 is used for probability distribution with described each transient state factor as weights, and the universal characteristic curve under described each transient state factor is weighted stack, obtains described engine consumption characteristic.
Preferably, described ten thousand Tequ line acquiring units 601 specifically can comprise:
The Work condition analogue subelement is used for simulating transient condition by the air inflow of regulating described engine;
Ten thousand Tequ lines obtain subelement, are used for obtaining the universal characteristic curve of described engine under each transient state factor.
Preferably, described Work condition analogue subelement specifically can comprise:
The bench test subelement is used for described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test;
The valve regulated subelement is for the air inflow of regulating described engine by regulating described valve, with the simulation transient condition.
Preferably, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under the 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 gets final product referring to the part explanation of embodiment of the method.System embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation that do not pay creative work
The present invention can describe in the general context of the computer executable instructions of being carried out by computing machine, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract data type, program, object, assembly, data structure etc.Also can in distributed computing environment, put into practice the present invention, in these distributed computing environment, be executed the task by the teleprocessing equipment that is connected by communication network.In distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method embodiment is to come the relevant hardware of instruction to finish by program, described program can be stored in the computer read/write memory medium, here alleged storage medium, as: ROM, RAM, magnetic disc, CD etc.
Also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Used specific case herein and principle of the present invention and embodiment have been carried out lock stated, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, 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 modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (8)
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 used for characterizing the transient state degree of engine;
Probability distribution according to described each transient state factor of the general data acquisition in road;
The probability distribution of described each transient state factor as weights, is weighted stack to the universal characteristic curve under described each transient state factor, obtains described engine consumption characteristic.
2. method according to claim 1 is characterized in that, the described universal characteristic curve of described engine under each transient state factor that obtain specifically comprises:
Simulate transient condition by the air inflow of regulating described engine, to obtain the universal characteristic curve of described engine under each transient state factor.
3. method according to claim 2 is characterized in that, describedly simulates transient condition by the air inflow of regulating described engine, specifically comprises:
Described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test, the air inflow of regulating described engine by control valve is with the simulation transient condition.
4. method according to claim 1 is characterized in that, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under the engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor.
5. an engine consumption characteristic test system is characterized in that, described system comprises:
Ten thousand Tequ line acquiring units are used for obtaining the universal characteristic curve of described engine under each transient state factor, and the described transient state factor is used for characterizing the transient state degree of engine;
Transient state factor distributed acquisition unit is used for the probability distribution according to described each transient state factor of the general data acquisition in road;
The weighted stacking unit is used for probability distribution with described each transient state factor as weights, and the universal characteristic curve under described each transient state factor is weighted stack, obtains described engine consumption characteristic.
6. system according to claim 5 is characterized in that, described ten thousand Tequ line acquiring units specifically comprise:
The Work condition analogue subelement is used for simulating transient condition by the air inflow of regulating described engine;
Ten thousand Tequ lines obtain subelement, are used for obtaining the universal characteristic curve of described engine under each transient state factor.
7. system according to claim 6 is characterized in that, described Work condition analogue subelement specifically comprises:
The bench test subelement is used for described engine is carried out bench test, at air inlet pipeline one adjustable valve is installed during test;
The valve regulated subelement is for the air inflow of regulating described engine by regulating described valve, with the simulation transient condition.
8. system according to claim 5 is characterized in that, the described transient state factor defines in the following way:
Wherein AFS_mSteady is the air inflow under the engine steady state operating condition, and AFS_mTrans is the real-time air inflow of engine, and TransFac is the transient state factor.
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| CN103969048A (en) * | 2014-02-18 | 2014-08-06 | 潍柴动力股份有限公司 | Method and device for selecting operating points |
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| CN109738191A (en) * | 2019-01-11 | 2019-05-10 | 北京三一智造科技有限公司 | Engine health status evaluation method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103969048A (en) * | 2014-02-18 | 2014-08-06 | 潍柴动力股份有限公司 | Method and device for selecting operating points |
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| CN109115502A (en) * | 2018-08-22 | 2019-01-01 | 安徽江淮汽车集团股份有限公司 | A kind of Engine Universal Characteristics detection method and module |
| 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 |
| CN109738191A (en) * | 2019-01-11 | 2019-05-10 | 北京三一智造科技有限公司 | Engine health status evaluation method and system |
| 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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