CN103148906B - Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method - Google Patents
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Abstract
Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, and be that diesel vehicle 50km/h or 60km/h constant speed bench teat simulation road examination total quality hundred kilometric fuel consumption detect, statistical correction is than discharge capacity fuel delivery per cycle q
cthe method of scope, first sets up q
cwith the magnitude relationship of hundred kilometric fuel consumptions, using the various in-use automotive type hundred kilometric fuel consumption limit values of standard criterion as statistics benchmark, calculate with the lower engine speed of regulation speed of a motor vehicle correspondence, add up the q that whole in-use automotive detects
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3, without the need to various technical parameters such as vehicle motor, wheel box, tires, also without the need to calculating q
cvalue, has advantage that is accurate, simple, quick, good operability.
Description
Technical field
Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, that diesel vehicle bench teat carries out fuel economy detection, the Fuel Consumption that the Fuel Consumption under testing environment state corrects under reference atmosphere state, determine during calculation engine corrected coefficient of power a to correct the method than discharge capacity fuel delivery per cycle scope, belong to automotive performance Platform test technical field.
Background technology
When existing diesel vehicle bench teat dynamic property, lug down method toxic emission detect, normally detect under maximum throttle full load mode, and power is usually in (75% ~ 100%) rated operating range, power limit scope usually at 25% ratings, correction than discharge capacity fuel delivery per cycle q
csetting is greater than 65mg/ (rising circulation), engine factor f
m=1.2 as definite value, and the error that calculating a causes is little for the correct evaluation impact of power.In order to improve the accuracy that bench teat Fuel Consumption detects, at Chinese invention patent application " the oil consumption detection of vehicle standard state and conversion method ", application number: in 201210102593.3, needs calculation engine corrected coefficient of power a.The limit value of diesel vehicle Fuel Consumption usually in the scope of 10% ratings, and is detect under model operating mode born by the engine section of vehicle sections throttle, if q
csetting is greater than 65mg/ (rising circulation), engine factor f
m=1.2 as definite value, can cause very large error.When measuring station tries detection hundred kilometric fuel consumption by specification 50km/h or 60km/h constant speed simulation road diesel vehicle on chassis dynamometer, because in-use automotive type is too many, complete whole vehicle technical parameter storehouses can not be had, be difficult to accurately calculate q
cvalue, easily causes a value error larger.It is to dissimilar car statistics that bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, with reference to hundred kilometric fuel consumption limit values of defined in GB/T18566-2011 " road transport fuel consumption in vehicles amount method of determination and evaluation ", after statistical study, obtain q more accurately
cvalue scope.
Summary of the invention
Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, and by standard GB/T18566-2011 " road transport fuel consumption in vehicles amount method of determination and evaluation ", it is Q that constant speed 50km/h or 60km/h measures hundred kilometric fuel consumptions
g, unit rises/hundred kilometers, in order to a detection Q
gvalue corrects and compares under unified normal condition and evaluate, and needs to correct with engine capacity correction factor a, engine factor f
mvery large on the impact of a, and correct than discharge capacity fuel delivery per cycle q
cto f
mimpact very large, by the appendix C of standard GB/T18276-2000 " vehicle dynamic quality Bench test methods and evaluation index ", calculate and correct than discharge capacity fuel delivery per cycle q
c, its unit is that milligram often circulates often liter of total displacement, unit mg/ (rising circulation), computing formula q
c=q/r, supposes that engine is natural aspiration mode, engine suction pressure ratio r=1, q
c=q, q are than discharge capacity fuel delivery per cycle.
By standard GB/T18566-2011 specification, being located at and measuring hundred kilometric fuel consumptions in bench teat distance S rice or time t second is Q
g, unit is for rising/100 kilometers, and setting diesel oil density is 0.835 kilogram/liter, is multiplied by 0.835 Q
gbe converted into the unit of kilogram per 100 km, time t=3.6 × S/V, unit s, V is the regulation constant speed speed of a motor vehicle, unit km/h, and diesel engine fuel feeding cycle index per minute is n/2, n is engine speed, unit is rev/min, and fuel feeding cycle index per second is n/120, and circulation total degree is N=t × n/120=3.6 × S × n/ (120 × V), the total displacement of known diesel engine is L liter, S=100 kilometer=100000m, V=50km/h, then q
c=1000000 × 0.835 × Q
g/ (N × L)=1000000 × 0.835 × 120 × V × Q
g/ (3.6 × 100000 × n × L)=278.3 × V × Q
g/ (n × L), unit mg/ (rising circulation), make Kv=V/n, q
c=278.3 × Kv × Q
g/ L.
Engine speed n when calculating or measuring vehicle constant speed, can calculate n=V × (i according to vehicle technology parameter
1× i
0)/(0.377 × R), V is the regulation constant speed speed of a motor vehicle, unit km/h, i
1for wheel box top gear position ratio of gear, i
0for final ratio, R is that wheel calculates rolling radius, unit m.Measuring station detects numerous in-use automotive type, is difficult to improve complete vehicle technical parameter database, accurately will calculate q to numerous vehicle
chave very large difficulty, measure the accuracy of engine speed with velocity gauge or operability bad.
Q is calculated by the most lower engine speed 1000r/min of top gear 50km/h of wheel box
cvalue, by C4.1.1 money in standard GB/T18276-2000, in correction than discharge capacity fuel delivery per cycle q
cwhen=q/r value is lower than 40mg/ (rising circulation), q is than discharge capacity fuel delivery per cycle, f
mdesirable steady state value 0.3 (f
m=0.3), if the r=1 of NA engine, q
c=q=278.3 × 50 × Q
g/ (1000 × L) < 40, solves Q
gdesirable f during < 2.875 × L
m=0.3, if engine with supercharger r is greater than 1, q > q
c, more meet q
cthe condition of < 40, through statistics, with diesel oil passenger vehicle length 12m or be not less than 7 liters, Q by the total displacement of engine of diesel-powered truck gross mass 13 tons
g< 2.875 × 7=20.125, from the limit value of standard GB/T18566-2011 appendix C, the limit value of the coach luxury coach constant speed 60km/h that 12m is long is 20.1 < 20.125, the limit value of the middle rank that 12m is long and regular grade passenger vehicle is 18.3 < 20.125, the limit value of 13 tons of lorries is 20.0 < 20.125, the meaning of its statistics is, the Q of the qualified in-use automotive of hundred kilometric fuel consumptions of these vehicles
gbe less than 20.125, then q
clower than 40mg/ (rising circulation).So, be not more than by diesel oil passenger vehicle and specified gross mass 13 tons can set q with diesel-powered truck (bicycle)
clower than 40mg/ (rising circulation), get f
m=0.3, greatly can simplify calculating like this, even if the error that the engine speed of extremely indivedual vehicle 50km/h speed of a motor vehicle causes lower than 1000r/min is also little.
In standard GB/T18566-2011, the Fuel Consumption limit value of defined is 110% of hundred kilometric fuel consumptions of good technique state vehicle, major part diesel automobile in use is less than this limit value, the value that fraction diesel automobile in use exceedes this limit value is also not too large, is reasonable and has suitable surplus with this limit value as actual hundred kilometric fuel consumptions of vehicle.
According to large quantitative statistics, the max. speed of heavy-duty diesel vehicle is relatively low, the engine speed also corresponding increase that the corresponding 50km/h speed of a motor vehicle is corresponding, and Kv reduces, and L value is corresponding increase also, and great majority adopt the aspirated mode of supercharging, and r is greater than 1 makes q
cgreatly reduce.", if the adhesion between semi-trailer train driving wheel and cylinder is less than Frame resistance and produces tyre slip then should calculate stand by the fully loaded gross mass of tractor (bicycle) and load resistance by standard GB/T18566-2011 the 8.5th section regulation ".This situation is surveyed hundred kilometric fuel consumptions and is greatly declined, and calculating and operation, also can set q to other heavy goods vehicles for simplifying
cbe less than 40mg/ (rising circulation), get f
m=0.3, substantially conform to actual conditions.
Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, be that all kinds diesel vehicle wheel box on chassis dynamometer most top gear constant speed simulation road examination total quality detects Fuel Consumption, during calculation engine corrected coefficient of power a, statistical correction is than discharge capacity fuel delivery per cycle q
cthe method of scope, is characterized in that: diesel vehicle 50km/h or 60km/h constant speed bench teat simulation road examination total quality hundred kilometric fuel consumption detect, and first set up q
cwith the magnitude relationship of hundred kilometric fuel consumptions, the various in-use automotive type hundred kilometric fuel consumption limit values of standard criterion are detected hundred kilometric fuel consumptions as corresponding, calculate with the lower engine speed of 50km/h or 60km/h correspondence, add up the correction of all various diesel oil passenger vehicles and part diesel-powered truck bicycle than discharge capacity fuel delivery per cycle q
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3 is constant.In like manner add up, the max. speed of heavy-duty diesel vehicle is relatively low, the corresponding increase of engine speed that the 50km/h speed of a motor vehicle is corresponding, the also corresponding increase of the total displacement of diesel engine, and most of relatively high power diesel engine for automobile adopts the aspirated mode of supercharging, engine suction pressure ratio r is greater than 1 makes q
ccorresponding reduction, also adds up the q of heavy-duty diesel vehicle
cbe less than 40mg/ (rising circulation), whole vehicle detects without the need to calculating q
cvalue, setting engine factor f
m=0.3 is constant.Technological merit of the present invention is as follows.
(1) q is set up
cwith the magnitude relationship of hundred kilometric fuel consumptions, by the diesel oil density under normal condition, volume per 100 km unit conversion can be become and q
cidentical unit, convenient statistics.
(2) the various in-use automotive type hundred kilometric fuel consumption limit values of standard criterion are detected hundred kilometric fuel consumptions as corresponding, there is accurate, simple, good statistics benchmark, not only be adapted at the bench teat statistics benchmark by vehicle, the same bench teat statistics benchmark being applicable to Fuel Consumption various new models relatively less than normal.
(3) max. speed of the rated speed top gear of various vehicle diesel engine is added up, obtain the statistics engine speed on the low side of top gear 50km/h, add up total displacement of various vehicle diesel engine, calculate by inequality, thus determine all various diesel oil passenger vehicles and part with the correction of diesel-powered truck bicycle than discharge capacity fuel delivery per cycle q
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3 is constant.
(4) feature of heavy goods vehicles diesel engine is added up, the max. speed of heavy-duty diesel vehicle is relatively low, the corresponding increase of engine speed that the 50km/h speed of a motor vehicle is corresponding, the also corresponding increase of the total displacement of diesel engine, adopt boosted suction mode equivalence can reduce total displacement of engine, as adopted natural aspiration mode, the corresponding increase of total displacement, so most of relatively high power diesel engine for automobile adopts the aspirated mode of supercharging, engine suction pressure ratio r is greater than 1 makes q
cgreatly reduce, the q of statistics heavy-duty diesel vehicle
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3 is constant.
(5) diesel vehicle 50km/h or 60km/h constant speed bench teat simulation road examination total quality hundred kilometric fuel consumption detect, and statistics determines the q of whole vehicle
cbe less than 40mg/ (rising circulation), without the need to many relevant art parameters of examined vehicle, also without the need to calculating q
cvalue, setting engine factor f
m=0.3 is constant.Under the prerequisite ensureing accuracy, substantially increase the operability of detection.
Embodiment
Bench teat diesel vehicle corrects and is exemplified below than the embodiment of discharge capacity fuel delivery per cycle statistical method:
Physical dimension (long × wide × high) 11995mm × 2550mm × 3600mm of 12 meters of long motorbus, kerb weight 11900kg, gross mass 17150kg, rating of engine P
efor 199kW, rated speed n
efor 2200r/min, aspirated mode is booster-type, and the total displacement L of engine is 7.8 liters, the most top gear i of wheel box
1be 0.74, tire radius R is 0.495m, final ratio i
0be Kv=V/n=(0.377 × R)/(i of 4.44,50km/h and 60km/h
1× i
0)=(0.377 × 0.495)/(0.74 × 4.44)=0.0568, the Kv of the different speed of a motor vehicle of the same gear of same vehicle is equal, but engine speed is not etc., and if do not considered pressure ratio, engine is natural aspiration mode r=1, q
c=q, suppose that this vehicle is for middle rank or regular grade passenger vehicle, then the hundred kilometric fuel consumption limit values of constant speed 50km/h are 18.3, q
c=278.3 × V × Q
g/ (n × L)=278.3 × 0.0568 × Q
g/ 7.8=2.0266 × Q
g, make 2.0266 × Q
g< 40, solves Q
g< 19.7, is greater than limit value 18.3, if this vehicle is coach luxury coach, the hundred kilometric fuel consumption limit values of constant speed 60km/h are 20.1 ≈ 19.7, because engine is boosted suction mode, and r > 1, q
c=q/r, then more meet q
c< 40mg/ (rising circulation), so, can f be established
m=0.3.
A semi-trailer train, kerb weight 7110kg, accurate towed vehicle gross mass 39500kg, the gross mass that tractor adds trailer is 7110+39500=46610kg, rating of engine 225kW, rated speed 2200r/min, wheel box top gear ratio of gear i
1=1, single-stage main transmission adds hub reduction, max. speed 93km/h, and the total volume of cylinder L of engine is 9.726 liters, calculating K v=0.041, and engine suction mode is charge inter cooling, and rated boost is than r=2.3, qc=q/r=278.3 × Kv × Q
g/ (r × L)=278.3 × 0.041 × Q
g/ (2.3 × 9.726) < 40, Q
g< 78.4, much larger than limit value 47.3, only needs pressure ratio 1.4, q
c=q/r=278.3 × Kv × Q
g/ (r × L)=278.3 × 0.041 × Q
g/ (1.4 × 9.726) < 40, solves Q
g< 47.7 is greater than limit value 47.3, meets q completely
c< 40mg/ (rising circulation), so, can f be established
m=0.3.
Bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, detection is measured at a bench teat simulation road test run total quality 50km/h or 60km/h constant fuel consumption, without the need to various technical parameters such as vehicle motor, wheel box, tires, whole in-use automotive detects can add up q
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3, there is advantage that is accurate, simple, quick, good operability.
Claims (1)
1. bench teat diesel vehicle corrects than discharge capacity fuel delivery per cycle statistical method, be that all kinds diesel vehicle wheel box on chassis dynamometer most top gear constant speed simulation road examination total quality detects Fuel Consumption, during calculation engine corrected coefficient of power a, statistical correction is than discharge capacity fuel delivery per cycle q
cthe method of scope, is characterized in that: diesel vehicle 50km/h or 60km/h constant speed bench teat simulation road examination total quality hundred kilometric fuel consumption detect, and first set up q
cwith the magnitude relationship of hundred kilometric fuel consumptions, the various in-use automotive type hundred kilometric fuel consumption limit values of standard criterion are detected hundred kilometric fuel consumptions as corresponding, calculate with the lower engine speed of 50km/h or 60km/h correspondence, add up the correction of all various diesel oil passenger vehicles and part diesel-powered truck bicycle than discharge capacity fuel delivery per cycle q
cbe less than 40mg/ (rising circulation), setting engine factor f
m=0.3 is constant; In like manner add up, the max. speed of heavy-duty diesel vehicle is relatively low, the corresponding increase of engine speed that the 50km/h speed of a motor vehicle is corresponding, the also corresponding increase of the total displacement of diesel engine, and most of relatively high power diesel engine for automobile adopts the aspirated mode of supercharging, engine suction pressure ratio r is greater than 1 makes q
ccorresponding reduction, also adds up the q of heavy-duty diesel vehicle
cbe less than 40mg/ (rising circulation); Statistics determines the q of whole vehicle
cbe less than 40mg/ (rising circulation), without the need to calculating q
cvalue, setting engine factor f
m=0.3 is constant, under the prerequisite ensureing accuracy, substantially increases the operability of detection.
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| CN109990858B (en) * | 2018-01-03 | 2021-02-09 | 陕西汽车集团有限责任公司 | Method and device for calculating fuel economy of diesel-methanol dual-fuel commercial vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963519A (en) * | 2010-07-17 | 2011-02-02 | 吴明 | Road test-simulated standard-state fuel consumption detection method based on bench test |
| CN102607659A (en) * | 2012-02-03 | 2012-07-25 | 吴明 | Method for fuel detection and conversion in vehicle standard state |
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|---|---|---|---|---|
| CN101963519A (en) * | 2010-07-17 | 2011-02-02 | 吴明 | Road test-simulated standard-state fuel consumption detection method based on bench test |
| CN102607659A (en) * | 2012-02-03 | 2012-07-25 | 吴明 | Method for fuel detection and conversion in vehicle standard state |
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