CN106353105A - Car performance detecting method and car comprehensive performance evaluating method - Google Patents
Car performance detecting method and car comprehensive performance evaluating method Download PDFInfo
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- CN106353105A CN106353105A CN201610663304.5A CN201610663304A CN106353105A CN 106353105 A CN106353105 A CN 106353105A CN 201610663304 A CN201610663304 A CN 201610663304A CN 106353105 A CN106353105 A CN 106353105A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a car performance detecting method and a car comprehensive performance evaluating method. The car performance detecting method includes: collecting the temperature of the catalyzing device of a to-be-detected car when the to-be-detected car is in an operating state; acquiring tail gas data from the OBD system of the to-be-detected car before the temperature of the catalyzing device reaches preset temperature; analyzing the harmful gas content in tail gas according to the tail gas data. The car performance detecting method has the advantages that the tail gas data of the to-be-detected car is obtained through detecting before the temperature of the catalyzing device of the to-be-detected car reaches the preset temperature, the problem that gas such as CO in the tail gas is decomposed at high temperature after the catalyzing device treatment in an existing detecting method and the authenticity of the detecting data is affected can be avoided, and the detected tail gas data is accurate and real. The car comprehensive performance evaluating method has the advantages that the method uses American lemon law as reference, a mathematical model is used to comprehensively consider aspects such as environment protection performance, safety performance, economy and power performance, and the evaluation is objective and real.
Description
Technical field
The present invention relates to automobile technical field, particularly to a kind of car consumption credit method and Car Comprehensive Performance Evaluation
Method.
Background technology
Common, automotive performance mainly includes safety (braking ability), dynamic property, the feature of environmental protection, fuel economy, automobile
Performance is to evaluate the key factor of car mass quality, and therefore, car consumption credit seems extremely important, especially used car
Performance detection, because performance determines price.
2015, used car exchange hand about 9,400,000,5,200,000 than 2013 increase by about one time, so high increasing
Long rate, illustrates that the potential value in market is very big.With the adjustment of policy, eight, state implements, and such as abolishes limit and moves, reduces tax
Take, specification transaction order, then used automobile market can be more flourishing, becomes new growth engines.
Pass judgment on the situation of used car, only see that outward appearance, application, car age etc. are very unilateral, answer emphasis to test and assess the comprehensive of it
Motility, safety, the feature of environmental protection, comfortableness, fuel economy.However, the non-standard phenomena in Second-hand Vehicle Transaction, such as
Do not honor credibility, price deception, concealment accident etc., hinder the normal development in market to a certain extent.These phenomenons produce
One of reason is because both parties' information is opaque, asymmetric, and its technical reason is just the absence of a kind of test and appraisal used car
The scientific method of quality." used car appraisal and evaluation technical specification " (gb/t30323-2013) using at present, also not
Science.For example: whether this specification, when the examination of road detection electromotor operates, accelerates, is only passed judgment on normal, normally do not deducted points, extremely all
2 points of button, this is inequitable.Because the acceleration time is fewer, dynamic property is better, answers levels of sub division, convenient transaction.
Taking the feature of environmental protection as a example, so that testing result tends to good, sell price to improve used car, used car is sold
Buyer would generally inform with the testing result after catalytic unit is processed in side, but vehicle exhaust is in the presence of catalytic unit,
Harmful gass co, hc in tail gas, nox(nitrogen oxides) will be studied and find catalytic unit when playing a role by pyrolytic,
Co can be made, hc discharge capacity declines more than 80%.The content of co, hc, nox of therefore detecting will be lower than truth, leads to examine
Survey result inaccurate, untrue.
Content of the invention
It is an object of the invention to the inaccurate deficiency of automobile environment-protection performance detection in the presence of improving prior art, carry
For a kind of car consumption credit method of the accuracy improving automobile environment-protection performance detection and Car Comprehensive Performance Evaluation method.
In order to realize foregoing invention purpose, embodiments provide technical scheme below:
A kind of car consumption credit method, comprises the following steps:
Tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile；
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, from the obd of described tested automobile
Emission data is obtained in system (on-board diagnostics, onboard diagnostic system)；
Analyze the content of the harmful gass containing in tail gas according to described emission data.
It is preferred that described tested automobile is in the state of Accelerating running, gather the temperature of the catalytic unit of tested automobile.Quilt
Survey automobile in the state of Accelerating running, the content highest of co, hc, nox in tail gas, therefore, examine in the state of Accelerating running
Survey various other contents in tail gas, the content data of more real co, hc, nox can be obtained.
According to embodiments of the present invention, methods described further comprises the steps of:
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, obtained by Tail gas measuring device
The content of the harmful gass containing in tail gas；Obtained according to the emission data analysis that obd system reads relatively under same time
The content of the harmful gass that the content of harmful gass is obtained with Tail gas measuring device, if comparision contents result is more than predetermined value,
Send alarm signal.According to embodiments of the present invention, methods described further comprises the steps of:
Run slowly during speed is zero in described tested automobile from pre-set velocity, collection user acts on pedal
Pedal pressing force, from described pedal force reach the first preset pressure value when, from the obd system of tested automobile obtain first
Test data, until the speed reduction of tested automobile is to zero, described first test data include steering angle, retarding braking distance,
In brake snubbing time at least two；
By described steering angle and described retarding braking distance or described steering angle and described brake snubbing time interpretation quilt
Survey the safety of automobile.Run slowly during speed is zero in tested automobile from pre-set velocity, steering angle can react
Running deviation value in braking procedure for the tested automobile, steering angle is less, illustrates that running deviation value is less, and automotive performance is better；Retarding braking
Distance or brake snubbing time can react the braking ability of automobile, and retarding braking distance is less, or brake snubbing time is fewer,
Illustrate that automobile brake perfrmance is better；During by detecting the steering angle of tested automobile and/or retarding braking distance and/or retarding braking
Between, braking safety and the brake hard ability of tested automobile can be detected.
According to embodiments of the present invention, methods described further comprises the steps of:
Generation time and the graph of a relation of steering angle, generate the graph of a relation of time and retarding braking distance.Test data is given birth to
Become image, be more convenient for intuitively checking.
According to embodiments of the present invention, methods described further comprises the steps of:
In described tested automobile during zero Accelerating running to setting speed, read from the obd system of tested automobile
Take accelerator pedal position data, start timing when accelerator pedal position reaches precalculated position, until tested automobile accelerates to institute
State setting speed, the power performance of the tested automobile of acceleration time interpretation to obtain in odb system；Or, in described tested automobile
During zero Accelerating running to setting speed, read throttle opening data from the obd system of tested automobile, work as solar term
Door aperture reaches and starts timing during predetermined aperture, until tested automobile accelerates to described setting speed, with obtain in odb system
The power performance of the tested automobile of acceleration time interpretation.
During zero Accelerating running to setting speed, the acceleration time can reflect the dynamic of tested automobile to tested automobile
Power performance, the acceleration time is shorter, illustrates that power performance is better, detects tested automobile in the acceleration time needed for accelerator, permissible
Detect the power performance of tested automobile.
According to embodiments of the present invention, methods described further comprises the steps of:
During tested automobile accelerates to described setting speed from zero, obtain from the obd system of tested automobile and send out
Motivation rotary speed data, generates time and engine speed image, if rotating speed has saltus step, the event of alarm electromotor in image
Barrier.In accelerator, if engine speed has saltus step, illustrate tested automobile storage in electromotor or Transmission Trouble.
According to embodiments of the present invention, methods described further comprises the steps of:
During described tested automobile travels at the uniform speed, using the fuel oil stream of automobile tested described in ultrasonic flow rate measurement amount
Amount.
The calculating of fuel consumption, oil consumption=flow × time, i.e. g=qt, so g=∫ qtdt, t=s/v (distance/speed),
Set by constant-speed driving method, q is provided by transit-time ultrasonic flow meter, thus calculate practical oil consumption.Oil consumption is also to evaluate
One important indicator of automobile, goes out the oil consumption of tested automobile by constant-speed driving method using ultrasonic flow rate measurement magnitude calculation,
Testing result accuracy is high.
Embodiments provide another kind of technical scheme,
A kind of car consumption credit method, comprises the following steps:
Tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile；
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, obtained by Tail gas measuring device
The content of the harmful gass containing in tail gas.
Before the temperature of the catalytic unit of tested automobile reaches preset temperature value, carry out Tail gas measuring, and directly use tail
Gas detection means directly gathers emission data and obtains harmful gass content, that is, the pyrogenetic decomposition eliminating catalytic unit is to inspection
Survey the impact that causes of result, eliminating plays tricks to obd system again leads to the false situation of emission data that therefrom obtains, passes through
In the tail gas that this method detection obtains, harmful gass content accuracy is high.
A kind of Car Comprehensive Performance Evaluation method, obtains the opinion rating of comprehensive vehicle performance using following evaluation model:
Wherein, 0≤wj≤ 1 and meetwjFor j-th evaluation index
Flexible strategy, m is the sum of evaluation index, and s is the opinion rating of comprehensive vehicle performance；
fjFor the subitem grade of j-th evaluation index, fj=ij×d=zj× d,xmax
≤cj≤xmin, ijFor the grading index of j-th evaluation index, xmaxFor the optimal value of reference interval, xminFor reference interval
Difference, cjIt is the actually detected value of j-th evaluation index being obtained according to any of the above-described method, d is equivalent coefficient, d >=2.
Compared with prior art, beneficial effects of the present invention: method provided in an embodiment of the present invention, is in tested automobile
Before the temperature of catalytic unit reaches preset temperature value, detection obtains the emission data of tested automobile, acts as in catalytic unit
With just collection emission data before, thus be excluded that catalytic unit carries out on gases such as the co in tail gas decomposing impact detection data
Verity is so that detect that the emission data obtaining is more accurate, truer.Additionally, emission data is directly from the obd system of tested automobile
Obtain in system, Data Source is more direct, can further improve the accuracy of detection.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be attached to use required in embodiment
Figure is briefly described it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
The flow chart of the car consumption credit method that Fig. 1 present pre-ferred embodiments 1 provide.
The flow chart of the car consumption credit method that Fig. 2 present pre-ferred embodiments 2 provide.
Specific embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Generally exist
The assembly of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged with various different configurations and design herein.Cause
This, be not intended to limit claimed invention to the detailed description of the embodiments of the invention providing in the accompanying drawings below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment being obtained on the premise of going out creative work, broadly falls into the scope of protection of the invention.
When buying automobile, especially used car, a kind of situation: tail gas number that buy before detection obtain often occurs
According to reflecting this automobile burning efficiency high, the feature of environmental protection is good, but actually used middle discovery after point of purchase, the efficiency of combustion of this automobile
Detection gained is so not good, or even larger gap occurs, illustrates that current method for detecting automobile exhaust gas is inaccurate.
Based on this, embodiments provide new detection method.
Embodiment 1
Fig. 1 shows the flow process of the car consumption credit method that the embodiment of the present invention 1 provides.Refer to Fig. 1, the present embodiment
The car consumption credit method of middle offer, comprising:
Step s101, tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile.
The temperature of collection catalytic unit needs to use temperature measurer, for itself without the automobile of temperature data, then needs to add
Fill temperature measurer on tested automobile, in order to gather the temperature of catalytic unit；Carry the automobile of temperature data for itself, then directly
Connect reading temperature data from automobile obd system.
It is preferred that in the state of tested automobile accelerates (as 0-40km/h) to run, gathering the catalytic unit of tested automobile
Temperature.Co, hc, no in the state of Accelerating running, in tail gasxIt is in maximum, therefore adopt under Accelerating running state
The temperature of collection catalytic unit, gathers emission data under Accelerating running state, can improve the accuracy of detection, energy further
Enough detect tested vehicle exhaust quality the most bad in the case of harmful gass content.
Step s102, before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, detection means from
Emission data is obtained in the obd system of described tested automobile.
Inventor finds according to research, and at present when detecting vehicle exhaust, the harmful gass such as co in tail gas are in catalysis dress
Pyrolytic in the presence of putting, causes the harmful gass contents such as co in the tail gas recording relatively low, therefore detects tested automobile
Combustion rate high, the feature of environmental protection is good.In this step, described preset temperature value is that the gases such as co divide in the presence of catalytic unit
The required temperature value of solution, according to researching and analysing, the temperature needed for all of harmful gass pyrolytic that may contain in tail gas
All more than 300 DEG C, therefore described preset temperature value can be 300 DEG C.In this step, reach pre- in the temperature of catalytic unit
If before temperature value, obtain emission data from the obd system of tested automobile, adopt before the gases such as the co in tail gas are decomposed
Collection emission data, the emission data of test gained is true and reliable, it is to avoid catalytic unit process after impact.Additionally, tail gas number
According to directly obtaining from the obd system of tested automobile, Data Source is more direct, can further improve the accuracy of detection.
It should be noted that described herein gather emission data preferably below 300 DEG C, it is not that temperature is more low better, is
Refer to preferably to gather below 300 DEG C and tested automobile Accelerating running this of a period of time during multiple emission datas, from
Choose a proper emission data in the plurality of emission data, or choose the less emission data of several change and ask again
Meansigma methodss.
Step s103, analyzes the content of the harmful gass containing in tail gas according to described emission data.
After detection obtains the content of harmful gass in tail gas, U.S.'s lemon law (lemon law) can be used for reference to tail-gas quality
It is classified, efficiency of combustion and the environmental-protecting performance reacting tested automobile is divided by tail-gas quality classification.As a kind of citing,
The impact to exhaust emissions for the catalytic unit is described: when λ=0.98, co=0.07% when catalytic unit works；Catalytic unit does not act as
Used time co=0.83%(data above is surveyed through tail gas unit and obtained by a Sweden volvo)；It can be seen that the catalytic unit working
The discharge of co can be greatly reduced, the present embodiment method can avoid the Tail gas measuring that such behavior of playing tricks leads to inaccurate,
Improve accuracy of detection.
Further, methods described also includes:
Step s104, before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, is examined by tail gas
Survey the content that device obtains the harmful gass containing in tail gas.
It should be noted that step s103, step s104 do not have dividing of sequencing, carry out in the same time, that is,
Obtain emission data from obd system and Tail gas measuring device obtains harmful gass content tail gas and carries out in synchronization.
Step s105, compare same time (i.e. Tail gas measuring unit is also to be in Accelerating running state in tested automobile, and
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, obtain emission data, and analyze in tail gas and contain
Harmful gass content) under examined with tail gas according to the content of harmful gass that the emission data analysis that obd system reads obtains
Survey the content of the harmful gass that device obtains, if comparision contents result is more than predetermined value, obtain under two ways is harmful
The difference of gas content is more than preset value, sends alarm signal.
It is multiple whether the difference of the harmful gass content judging to obtain under two ways herein can have more than preset value
Embodiment, for example, under two ways, judge whether the content difference of each of tail gas evil gas is more than preset value, only
The content difference having a kind of harmful gass is more than preset value and is then judged to the difference of the harmful gass content obtaining more than default
Value；And for example, under two ways, in tail gas the content difference of each harmful gas be all higher than preset value just be judged to obtain have
The difference of evil gas content is more than preset value.
Generally, the data reading from obd system is more real data, but the bad businessman of small part can
In obd system, cheating software can be installed so that the data reading from obd system is untrue.Obtain under two ways
In tail gas harmful gass content inconsistent it is possible to be tested automobile obd system in be mounted with to practise fraud software so that from obd
The data reading in system is untrue, leads to the content analyzing the harmful gass obtaining inaccurate, therefore, side described in the present embodiment
Method can also exclude the situation by practising fraud to obd system, the content of harmful gass in the tail gas being obtained with Tail gas measuring device
For testing result, pass judgment on the environmental-protecting performance of tested automobile, can further improve the accuracy of testing result.
The method that application the present embodiment provides detects the tail-gas quality of automobile, can exclude the impact of catalytic unit, and not
Need to remove catalytic unit, and directly record the true emission behaviour of electromotor, accuracy is high.
As another kind of more succinct technical scheme, embodiments provide another kind of car consumption credit method,
Comprise the following steps:
Tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile；
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, obtained by Tail gas measuring device
The content of the harmful gass containing in tail gas.
Before the temperature of the catalytic unit of tested automobile reaches preset temperature value, carry out Tail gas measuring, and directly use tail
Gas detection means directly gathers emission data and obtains harmful gass content, that is, the pyrogenetic decomposition eliminating catalytic unit is to inspection
Survey the impact that causes of result, eliminating plays tricks to obd system again leads to the false situation of emission data that therefrom obtains, passes through
In the tail gas that this method detection obtains, harmful gass content accuracy is high.
Embodiment 2
Fig. 2 shows another kind car consumption credit method provided in an embodiment of the present invention.Refer to Fig. 2, the present embodiment
The car consumption credit method providing, comprising:
Step s201, tested automobile in the state of Accelerating running, tested automobile catalytic unit temperature at 300 DEG C
Hereinafter, the content of the harmful gass containing in tail gas is obtained by Tail gas measuring device.
Step s202, in described tested automobile from pre-set velocity (as the 50km/h or 100km/h) speed that runs slowly be
During zero, gather, using pressure transducer, the pedal pressing force that user acts on pedal, reach first from described pedal pressing force
During preset pressure value, the moment that is, brake force functions to, detection means obtains from the obd system of tested automobile
One test data, until the speed reduction of tested automobile is to zero, described first test data include steering angle, retarding braking away from
In, brake snubbing time at least two, by described steering angle and described retarding braking distance or described steering angle and institute
State the safety that brake snubbing time carrys out interpretation automobile.
When realizing, the pedal pressing force that pressure transducer will act on pedal is converted into the signal of telecommunication, is transferred to detection means, inspection
Survey device and receive this signal of telecommunication, when this signal of telecommunication reaches corresponding (pressure is linear with the signal of telecommunication) first default pressure
During force value, start to extract the first test data from obd system, until the speed reduction of tested automobile is to zero.From start extract
First test data to the speed reduction of tested automobile to zero during have multiple first test datas (each during this
Individual timing node (or referred to as test moment) has first test data).
Run slowly during speed is zero in tested automobile from pre-set velocity, steering angle can react tested automobile
Stability (i.e. running deviation value) in braking procedure, steering angle is less, illustrates that running deviation value is less, and vehicle steadily performance is better.Existing
Having in technology is to try every possible means the distance of direct measurement sideslip, to judge the stability of tested automobile with the distance of sideslip, directly to survey
The distance of amount sideslip is very inaccurate, and the stability therefore recording is also inaccurate, in the present embodiment methods described, by from obd system
Steering angle is directly read, with steering angle interpretation running deviation value, accuracy is high in system.
The calculating of wherein steering angle α: steering angle, (sets initial speed of braking 50km/h, system in gb7258-2012 standard
Move apart from 19m) under, ∵ sin α=x/k in right angle trigonometry, ∴ x=ksin α, x=k ∫ sin α d α, wherein x represent sideslip distance, k table
Show the braking distance (constant determining according to relevant standard) of permission it follows that several representative values below, such as α=1 ° 30 ' (run
Partially=0.5m)；α=4 ° 31 ' (sideslip=1.5m)；α=7 ° 33 ' (sideslip=2.5m)；α > 7 ° 33 ' (sideslip ＞ 2.5m).Big according to running deviation value
Little, stability of automobile can be divided into some grades.
Retarding braking distance and brake snubbing time can react the braking ability of automobile, and retarding braking distance is less, subtracts
Fast braking time is fewer, illustrates that automobile brake perfrmance is better；By detecting the steering angle of tested automobile, and retarding braking distance
And/or brake snubbing time, the safety of tested automobile can be detected, i.e. the insensitivity of tested automobile and brake hard
Ability.Retarding braking distance: distance is less, illustrates that tested automobile braking performance is better.Can be according to the size of braking distance by vapour
Car braking ability is divided into some grades.Brake hard required time (i.e. aforementioned brake snubbing time), the time is fewer, and vapour is described
Car braking is better.Some grades can be divided into according to many major generals automobile brake perfrmance of braking time.Running deviation value can be used
Acceleration and deceleration braking distance represents braking ability it is also possible to represent braking ability with running deviation value acceleration and deceleration braking time.
Described first test data includes at least one in steering angle and retarding braking distance, brake snubbing time,
Retarding braking distance or brake snubbing time can reflect the braking ability of tested automobile, and first test data can be anti-
The braking ability of tested automobile under a timing node should be gone out, it is preferred that in this step, detection means is getting the first test
After data, the graph of a relation of generation time and steering angle, the graph of a relation of time and retarding braking distance, with the time as references object,
Generate steering angle, retarding braking distance, the graph of a relation of brake snubbing time, can be easy to know in overall process from the image generating
Vehicle Driving Wandering amount (being represented with steering angle) and/or retarding braking distance and/or brake snubbing time situation.
Step s203, in tested automobile during zero Accelerating running to setting speed (such as 100km/h), from obd
Read throttle opening data (being applied to old vehicle) or accelerator pedal position data (being applied to new model) in system, work as solar term
Door aperture data reaches predetermined aperture or accelerator pedal position data reaches and starts timing during precalculated position, until tested automobile
Accelerate to setting speed, obtain the acceleration time, the power performance of the tested automobile of acceleration time interpretation to obtain.
Used time is fewer, and acceleration is bigger, then dynamic property is also better.Can be drawn with many major generals vehicle dynamic quality of acceleration time
It is divided into some grades.
Step s204, during tested automobile accelerates to described setting speed, obtains tested automobile from obd system
Engine speed data, generate time and engine speed image, if rotating speed has saltus step, alarm electromotor in image
Fault.
In accelerator, accelerator pedal keeps standard-sized sheet, if data image sees engine speed positive transition, illustrates to load
Instantaneous reduction, thus can distinguish that slipping of clutch or driving parts skid and cause；If data image sees that engine speed is unexpected
Negative sense saltus step, illustrates that load transients increase, and shows that gearbox shifting is braked.
At present, due to technological progress, quality-improving, the new car dispatching from the factory all is configured with computer.To detect the power of automobile
Property, with traditional technique in measuring engine power, oneself cannot realize.This is because: waterpower measurement of power, current vortex measurement of power, non-loaded survey
Work(, Chassis dynamometer broadly fall into non-with regard to car measurement of power, during detection require reasonable match separate, and automobile computer be control full car
, it is not suitable for above-mentioned detection, lacks the sensing data of a part, computer will be considered as fault and protectively quit work
(or limiting power output with slow-speed of revolution operating) it is impossible to record power, power performance cannot judge.But in this method, plus
The measuring and calculating of fast time is according to (when throttle opening data or acceleration are stepped on throttle opening data or accelerator pedal position data
Board position data respectively reaches and starts timing during preset value), throttle opening data or accelerator pedal position data are directly from quilt
Survey in the obd system of automobile and obtain, and then obtain the acceleration time, the power performance of automobile can be tested.Generally impact automobile drives
The principal element of driving wheel power is the heat loss (mainly being caused by the self-defect of electromotor) of electromotor and mechanical loss is (main
Determined by the technology status of power train).Three kinds of results can be reflected according to this step measuring acceleration: one be driving wheel power just
Often, that is, reasonable match is all normal；Two are that electromotor is normal and power train is abnormal；Three is that electromotor is abnormal and be driven
System is normal.Will be appreciated that of this method: the reason can find dynamic property difference is electromotor or power train；It can also
Find cheatings such as " ejection accelerate ".And be overall process detection, be different from traditional method only sees final result.Example
As in the data image of measuring acceleration, moment and end product before acceleration can not only be found out, certain a flash during more finding out
Between be electromotor or the faulty hidden danger of power train.
Step s205, during described tested automobile travels at the uniform speed, using ultrasonic flow rate measurement magnitude calculation go out by
Survey the oil consumption of automobile.Detect fuel flow using ultrasonic flowmeter, accurately and reliably, ultrasonic flowmeter can be selected the time difference
Formula ultrasonic flowmeter, doppler type ultrasonic flowmeter etc., are prior art using ultrasonic flowmeter detection fuel flow,
This is not run business into particular one herein and state.Fuel consumption in actual motion for the automobile is calculated using transit-time ultrasonic flow meter reflecting value
Amount, it is possible to separate some grades with this, evaluates economy.
It should be noted that the execution sequence of above-mentioned steps s201-s205 does not limit, can arbitrarily arrange.This enforcement
The car consumption credit method that example provides not only can detect the environmental-protecting performance of automobile exactly, can also detect that the system of automobile
Dynamic performance, power performance and oil consumption performance, and testing result accuracy is high, can exclude and make present in current detection method
Vacation, and detection process is simple, quick.
Detection means described in the embodiment of the present invention, including interface unit, microcontroller, temperature measurer, display screen, pressure
Sensor and ultrasonic flowmeter；Wherein,
Described interface unit is used for being connected with the obd system of tested automobile to obtain data；
Described temperature measurer is electrically connected with described microcontroller, is used for being installed on tested automobile, detects tested automobile
The temperature of catalytic unit, and the temperature data that obtains of detection is transmitted to described microcontroller.
Described display screen is used for showing the data producing in detection process or image, such as emission data；
Described pressure transducer, runs slowly the process that speed is zero from pre-set velocity in tested automobile for collection
In, act on the pedal force of pedal, and the pressure value collecting is transmitted to described microcontroller；
Described microcontroller is used for, and is in Accelerating running state, and the catalytic unit of described tested automobile in tested automobile
Temperature reach preset temperature value before, by described interface unit, from the obd system of described tested automobile obtain tail gas number
According to, and according to described emission data, analyze the content of the harmful gass containing in tail gas；It is additionally operable to compare basis under same time
The emission data that obd system reads analyzes containing of the harmful gass that the content of harmful gass obtaining is obtained with Tail gas measuring device
Amount, if comparision contents result is more than predetermined value, sends alarm signal；It is additionally operable to when pedal force reaches the first preset pressure value
Start, obtain the first test data from the obd system of tested automobile, until the speed reduction of tested automobile is to zero, described the
One test data include steering angle, retarding braking distance, at least two in brake snubbing time, by described steering angle and institute
State retarding braking distance or the safety of described steering angle and the tested automobile of described brake snubbing time interpretation；It is additionally operable in institute
State tested automobile and record the acceleration time during zero Accelerating running to setting speed, with the tested automobile of acceleration time interpretation
Power performance；It is additionally operable to during tested automobile accelerates to described setting speed from zero, from the obd system of tested automobile
Obtain engine speed data, generate time and engine speed image, if rotating speed has saltus step in image, alarm starts
Machine fault.
Described ultrasonic flowmeter, for measuring fuel flow during traveling at the uniform speed for the tested automobile.
Above method can science, objectively detect automobile several main performances, and obtain quantify testing result, be
More fully embody its use value, just adopt the method for multi objective weighted synthetical evaluation to vapour using these testing results below
Car performance carries out quantitative grading.This ranking method comprises the steps:
1st, automotive performance System of Comprehensive Evaluation
As previously described automotive check method can easy, exactly collection reflection vehicle dynamic quality, safety, the feature of environmental protection and
The relevant parameter of fuel economy, these parameters possess the feature of simplicity, independence, representativeness, feasibility, meet comprehensive commenting
The selecting index principle of valency method, and, various performance parameters are all that measured result is operating mode ginseng with recording with regard to bus or train route examination method
Number, data is true, suitable quantitative assessment, and quantized result levels off to the real experiences of user vehicle most, therefore, using these parameters
Set up assessment indicator system automobile to be carried out quantitative grade with more scientific and referential, that is,
y={y1, y2, y3, y4}
Automotive performance quantitation standard diagrams system is as shown in table 1.
Table 1 automotive performance quantitation standard diagrams system
| Index property | First class index | Two-level index |
| Quantitative target | Safety | Braking distance ＆ brakes side-play amount (y1) |
| Quantitative target | Dynamic property | Zero to one hundred kilometer of acceleration time (y2) |
| Quantitative target | The feature of environmental protection | Co content (y3) |
| Quantitative target | Fuel economy | Oil consumption (y4) |
Note: braking distance braking side-play amount represents that two amount degrees of association are extremely strong, merges into an index.
2nd, the calculating of flexible strategy
Judging panel is formed by technical specialist, managerial expert and evaluation expert, by each judging panel rule of thumb, is independently given a set of
Flexible strategy, form a weight matrix, that is,
In formula, n is the quantity of judging panel；M is evaluation index sum
In data processing, its arithmetic mean of instantaneous value is taken to represent the concentration suggestion of judging panel.Its computing formula is
In formula, n is the quantity of judging panel；M is evaluation index sum；wjFlexible strategy meansigma methodss for j-th index；wjiFor i-th
Individual judging panel gives the tax weights of j-th index weight
The algorithm of flexible strategy normalized is
Algorithm above gained flexible strategy use as standard weight.During practical application, the determination of flexible strategy adopts subjective weights
Method dynamically sets, and can adjust flexible strategy according to estimator to the specific demand of some performances, the result of so grading can more meet
The individual requirement of user.
3rd, comprehensive evaluation model and algorithm
Automotive performance quantitation rating scheme such as table 2.Wherein, the definition of two-level index (e) and dimension are with reference to the relevant mark of country
Standard, reference value interval is (x) chosen with reference to the countries concerned's standard or new car measured data, safety (y1) two two-level index
(e1, e2) because the degree of association is extremely strong, for ease of quantifying, its index (i that grades1) take logic phase and method make merging treatment, meter
Calculation method is i1=z11·z12, (wherein, z11Represent the gauge index of braking distance, z12Represent the gauge index of braking side-play amount,
Calculated with the algorithm of gauge index (z) in following formula), equivalent coefficient (d) can determine that the sum of grade classification, such as d=
100, then altogether can be divided into 100 grades, the rest may be inferred.
Table 2 automotive performance quantitation rating scheme
Computational methods are as follows:
Gauge index
Illustrate: xmaxRepresent optimal value, because its internal relation is inversely proportional, that is, its numerical value is less, and performance is more excellent,
So there being xmax≤c≥xmin
Grading index i=z (special case, i1=z11·z12)
Equivalent coefficient d >=2
Subitem grade f=i d
Integrated level
In formula, 0≤wj≤ 1 and meetfjSubitem grade for j-th index.Grading example:
Taking test and assess one and have 2013 sections of Mondeo 1.5l gtdi180 of 3 years cars as a example, set reference value interval
The figure of merit (xmax) it is the optimum measured value of this model new car, equivalent coefficient (d) is 100, and the parameter that this car test is surveyed substitutes into
Following rating result.
As upper table: each Indexs measure value, reference value interval, equivalent coefficient, flexible strategy determine and oneself know, then its dynamic property point
Item grade (f2) it is calculated as follows:
Gauge index
Grading index i2=z2=0.99
Subitem grade f2=i2·d2=0.99 100 (equivalent coefficient d2Value is 100)
Same method, can calculate f1、f3f4, then
Integrated level s=f1×w1+f2×w2+f3×w3+f4×w4
=89×30%+99×30%+92×20%+98×20%
=94
This its integrated level of car rating result is 94 points, and safety grades are 89 points, and dynamic property grade is 99 points, the feature of environmental protection
Grade is 92 points, and fuel economy grade is 98 points, and these grades are all made comparisons with this vehicle new car actual measurement optimal performance
Score, referential is good, if one same model vehicle test and appraisal of alternative obtain a result, two chassis can directly pass through to grade
Divide to come comparison good and bad.
4th, the using and analyzing of rating result
The grading of tested vehicle can objectively reflect the overall performance of this car with quantifying the form of score value, for user's choosing
Purchase automobile particularly used car when have directly reference role.In actually used, because the difference of test condition is (as tire pressure, road
Road situation, car load equipment etc.) it is possible to there is grading error, so, the process standardization detecting and grading should be ensured as far as possible,
And introduce correction parameter correction grading error.
In detection process, in addition to five two-level index of the need of grading, also acquire process data, if rating result
Abnormal moreover it is possible to provide a user with the data analysiss of its process, find automobile storage problem and hidden danger.
The method that the present invention addresses, customizable special inspecting equipment is detected and is graded, and intermediate data uploads cloud automatically
Client database preserves, and excavates for big data and analysis is prepared, and the report detecting and grading can be given through the Internet real-time Transmission and be used
The mobile phone at family or computer, ensure that user obtains immediately objective, transparent with value information.
Car consumption credit method provided in an embodiment of the present invention, has the advantage that
Objectivity: based on OBD (on-board diagnostics) system, total data is derived from automobile certainly
Body, no any extraneous or artificial disturbance, objective, accurate.
Simplicity: with regard to car (being directly tested automobile during road travel) dynamic detection, be different from traditional needs
To special detection line Static Detection.
Scientific: all detection variable, all expressed with mathematical formulae, during integration, support many grade classification.
Novelty: divide tested vechicle with Mathematical Modeling Methods, be quantitative, each index all can be subdivided into a lot of grades.
Practicality: index subdivision, beneficial to the difference reflecting between performance, meets market, meets individual requirement, is easy to distinguish,
Favourable transaction.
Predictability: the condition of instant error during can reflecting because of data image, help and distinguish fault, remove a hidden danger.
When surveying deceleration, energy simultaneous reactions go out the relation of pedal force size, running deviation value, braking distance and time.Survey and accelerate
The relation of velocity variations, distance, time when spending, can be reflected simultaneously.During detection tail gas, the impact of catalytic unit can be excluded,
And directly measure the true emission behaviour of electromotor.During traditional technique in measuring, the combustible gas that the bad electromotor that burns is discharged is being urged
By pyrolytic in gasifying device, see that merely exhaust emissions is qualified, it is not good and many because burning that this illusion masks electromotor
Fuel consumption, the fact that cause the wasting of resources.For example: the germany volkswagen emission of diesel engine fraud event of in September, 2015 outburst,
It is exactly producer's cheating software deception supervision.When automobile travels on road, actual exhaust emissions amount exceedes the 40 of Unite States Standard
Times, but, when entering detection program, whether the code (defeat-device) in automobile ecu can automatically identify oneself
Detected tail gas, adjusts exhaust gas processing device with this, is detected by discharge.During detection fuel consumption (l/100km), with constant speed
Traveling method is carried out, and reflects fuel consumption in actual motion for the automobile, and separates grade with this, evaluates economy, so may be used
To prevent data fabrication, prevent as " the generation of company's fuel door event of Japanese ＂ Rhizoma Sparganii.Using the method for the present invention, just can find
Such fraud problem, science, simplicity, easy to operate, save trouble, fast, efficiency high.Examination criteria is gb7258-2012 or tested vapour
The genuine new car performance parameter of car.
Analyzed by data image, result can not only be found out, it can also be seen that during certain hidden danger of occurring in a flash, to carrying
High comprehensive vehicle performance is of great advantage.Meanwhile, detection process can through the Internet real-time Transmission to the mobile phone of both parties or computer,
So, both parties just can information transparency, symmetrical under conditions of, determine the price by matter, by level, beneficial to fair deal.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be defined by scope of the claims.
Claims (10)
1. a kind of car consumption credit method is it is characterised in that comprise the following steps:
Tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile；
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, from the obd system of described tested automobile
Middle acquisition emission data；
Analyze the content of the harmful gass containing in tail gas according to described emission data.
2. car consumption credit method according to claim 1 is it is characterised in that described tested automobile is in Accelerating running
Under state, gather the temperature of the catalytic unit of tested automobile.
3. car consumption credit method according to claim 1 is it is characterised in that methods described further comprises the steps of:
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, tail gas is obtained by Tail gas measuring device
In the content of harmful gass that contains；
The content of the harmful gass being obtained according to the emission data analysis that obd system reads relatively under same time and Tail gas measuring
The content of the harmful gass that device obtains, if comparision contents result is more than predetermined value, sends alarm signal.
4. the car consumption credit method according to Claims 2 or 3 is it is characterised in that methods described further comprises the steps of:
Run slowly during speed is zero in described tested automobile from pre-set velocity, collection user acts on stepping on of pedal
Plate pressure, from described pedal force reach the first preset pressure value when, from the obd system of tested automobile obtain first test
Data, until the speed reduction of tested automobile is to zero, described first test data includes steering angle, retarding braking distance, slows down
In braking time at least two；
By described steering angle and described retarding braking distance or described steering angle and the tested vapour of described brake snubbing time interpretation
The safety of car.
5. car consumption credit method according to claim 4 is it is characterised in that methods described further comprises the steps of:
Generation time and the graph of a relation of steering angle, generate the graph of a relation of time and retarding braking distance.
6. car consumption credit method according to claim 4 is it is characterised in that methods described further comprises the steps of:
In described tested automobile during zero Accelerating running to setting speed, read from the obd system of tested automobile and add
Speed pedal position data, starts timing when accelerator pedal position reaches precalculated position, until tested automobile accelerate to described in set
Constant speed degree, the power performance of the tested automobile of acceleration time interpretation to obtain in odb system；Or,
In described tested automobile during zero Accelerating running to setting speed, read section from the obd system of tested automobile
Valve opening data, starts timing when throttle opening reaches predetermined aperture, until tested automobile accelerates to described setting speed
Degree, the power performance of the tested automobile of acceleration time interpretation to obtain in odb system.
7. car consumption credit method according to claim 6 is it is characterised in that methods described further comprises the steps of:
During tested automobile accelerates to described setting speed from zero, obtain electromotor from the obd system of tested automobile
Rotary speed data, generates time and engine speed image, if rotating speed has saltus step, alarm electromotor or power train in image
Fault.
8. car consumption credit method according to claim 7 is it is characterised in that methods described further comprises the steps of:
During described tested automobile travels at the uniform speed, using the fuel flow of automobile tested described in ultrasonic flow rate measurement amount.
9. a kind of car consumption credit method is it is characterised in that comprise the following steps:
Tested automobile, in the state of running, gathers the temperature of the catalytic unit of tested automobile；
Before the temperature of the catalytic unit of described tested automobile reaches preset temperature value, tail gas is obtained by Tail gas measuring device
In the content of harmful gass that contains.
10. a kind of Car Comprehensive Performance Evaluation method is it is characterised in that obtain comprehensive vehicle performance using following evaluation model
Opinion rating:
Wherein, 0≤wj≤ 1 and meetwjFor the flexible strategy of j-th evaluation index,
M is the sum of evaluation index, and s is the opinion rating of comprehensive vehicle performance；
fjFor the subitem grade of j-th evaluation index, fj=ij× d=zj× d,xmax≤cj
≤xmin, ijFor the grading index of j-th evaluation index, xmaxFor the optimal value of reference interval, xminWorst for reference interval
Value, cjIt is the actually detected value of j-th evaluation index being obtained according to claim 1-8 any one methods described, d is grade system
Number, d >=2.
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