CN104198005B - Automobile multi-state the examination of road oil consumption simulation calculates detection method - Google Patents
Automobile multi-state the examination of road oil consumption simulation calculates detection method Download PDFInfo
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Abstract
Automobile multi-state the examination of road oil consumption simulation calculates detection method, examined new model presses the coefficient of rolling resistance equation and coefficient of air resistance equation of affiliated class of vehicle, calculate the rolling resistance and air drag of each speed, calculate engine accessory power rating consumption moment of torsion and acceleration resistance, the engine output of constant speed and each speed of accelerating mode can be obtained, moment of torsion and rotating speed, the Fuel Consumption of each operating mode is calculated with universal characteristic curve of engine correspondence specific fuel consumption, calculate to compensate dynamic power Fuel Consumption with the larger driving power in vehicle speed intervals, should be larger in the vehicle speed intervals of very low velocity degree, engine output is set to reach stable state, stop to determine the Fuel Consumption of decelerating mode for rotating speed with respect to idling with engine speed, the Fuel Consumption of idling operation is calculated with engine idle fuel parameter, the automatic Fuel Consumption for calculating multi-state the examination of road or waste gas discharge.
Description
Technical field
Automobile multi-state the examination of road oil consumption simulation calculates detection method, examines new model and is tried without the examination of road or platform, by affiliated car
The coefficient of air resistance equation and coefficient of rolling resistance equation of classification, calculate constant speed with vehicle associated technical parameters, accelerate, subtract
A kind of detection method of speed, idling multi-state the examination of road Fuel Consumption or waste gas discharge, belongs to the skill of car consumption credit method
Art field.
Background technology
Prior art detects new model multi-state the examination of road Fuel Consumption, typically by national standard GB/T12545.2-2001
《Commerial vehicle consumption trial method》And GB/T27840-2011《Heavy type commercial vehicle Fuel Consumption measuring method》,
In each regulation constant speed, acceleration, deceleration, idling multi-state measurement the examination of road Fuel Consumption.It is disadvantageous in that：(1) the examination of road
The vehicle break-in tried with platform is expensive, and Check-Out Time is long.(2) the examination of road detects Fuel Consumption by factors such as pavement conditions, wind-force
Influence, running resistance, engine power and the Fuel Consumption of vehicle are influenceed by environment temperature, atmospheric pressure etc..(3) calculating method is not
Divide body categories CDIt is larger as the error of definite value, estimate that the error of low speed gear vehicle tumbler equivalent inertia is too big.(4) platform
Examination and calculating method do not have the operational very poor of specification gear, are difficult in the very low speed of accelerating mode rich by calculated torque per second
Rate.(5) platform examination is difficult the inertia acceleration resistance of the fully loaded heavy goods vehicles of simulation.To overcome the deficiencies in the prior art, using automobile multiplexing
Condition the examination of road oil consumption simulation calculates detection method, and road is calculated by the associated technical parameters of examined new model and defined multi-state simulation
Try Fuel Consumption or waste gas discharge.
The content of the invention
Experiment shows that the vehicle road coefficient of rolling resistance f of identical tire classification is approximately equal, identical body categories
Coefficient of air resistance CDAlso approximately equal.Can in the range of certain gross mass in the range of (lorry) or length of wagon (car),
The vehicle of identical body categories and identical tire classification is incorporated into as same vehicle classification, all new models of same class of vehicle
Coefficient of rolling resistance equation and coefficient of air resistance equation it is all identical.By the associated technical parameters and multi-state the examination of road of new model
It is required that simulation calculated fuel consumption or waste gas discharge, it is adaptable to manual transmission vehicle.Various class of vehicle statistics the examination of road steps
It is rapid as follows：
1st, it can be three kinds tire category division：Bias tire, radial-ply tyre deflected width of tyre ＜ 8.25in, radial-ply tyre wheel
Tire section width >=8.25in, usual car uses radial-ply tyre.Car and articulated coach can divide body categories by length,
Lorry can divide body categories by car body style：As low-grade wooden handcart, high-grade wooden handcart, wind scooper car, dumper, tractor,
Storehouse grid car, van, tank car, engineering truck (such as concrete mixer)；Because bus body length has contained qualitative factor, so
Without subdivided quality category, but lorry also needs to divide multiple quality categories by specified gross mass M again：Such as M ＜ 10000kg,
10000kg≤M ＜ 15000kg, M >=15000kg, passenger car can divide class of vehicle by Reference mass.By actual conditions with
Different tire classification, body categories, quality category are appropriately combined into different class of vehicle.
2nd, every kind of class of vehicle hangs up neutral after gearbox highest speed gear to max. speed at least with a new model the examination of road
Slide, vehicle can be fully loaded with, single-stage main transmission, measure the vehicle travel resistance of every 10 integer speed point, a most young waiter in a wineshop or an inn can be used
Multiplication calculates rolling resistance, air drag and the examination of road viscous drag correction coefficient, obtains the rolling resistance system of each 10 integer speed point
Count and coefficient of air resistance, and a whole coefficients are all corrected in reference atmosphere state, be i.e. 20 DEG C of temperature；Atmospheric pressure 100kPa school
On the occasion of.
3rd, f and the linear function or quadratic equation of speed are calculated, C is calculatedDWith the linear function or quadratic equation of speed.Such as
Really same class of vehicle has many new models to test calculating regression equation of then averaging, and speed unit is km/h, and as same
The identical correction coefficient equation of all new models of one class of vehicle.
When any new model need to examine multi-state the examination of road Fuel Consumption or waste gas to discharge, based on requiring in detail below
Calculate：
(1) class of vehicle and corresponding f formula and C belonging to being determined by vehicle associated technical parametersDFormula：Vehicle type
Number；Body categories；Kerb weight m, units/kg；Gross mass M, units/kg；Engine power rating Pe/ rated speed ne, unit kW
And r/min；The gearratio i that gearbox is respectively kept offg；Single-stage or twin-stage final ratio i0；Tyre model specification；Body dimensions：It is long × wide
× high, unit mm；Detect vehicle velocity Vi, unit km/h；Front tread, unit mm.
(2) rolling resistance is calculated：The coefficient of rolling resistance f of each speed is calculated by the f equations of affiliated class of vehicleiAnd rolling
Resistance Ffi=k1×fi×M×g；Wherein：k1For drive mechanism coefficient, in the range of 1~1.04, single-stage main transmission takes 1, twin-stage
It is acceleration of gravity that main transmission or duplex, which are driven bridge and taken more than 1, g, can use 9.81m/s2。
(3) air drag is calculated：By the C of same vehicle classificationDEquation calculates the coefficient of air resistance C of each speedDiAnd sky
Atmidometer Fwi=0.5 × CDi×A×ρ×V0 2, A is vehicle front face area, unit square rice, atmospheric density ρ=1.189N
s2m-4, vehicle velocity V0Unit is m/s, V0 2=Vi 2/ 12.96, ViUnit is km/h.
(4) engine speed is calculated：According to tyre model specification, tire outside diameter D can be obtained, determines that wheel calculates radius R=
0.5×k2× D, unit rice, k2Radius factor, k are calculated for tire2In the range of 0.92~0.96, zero load takes value bigger than normal, is fully loaded with
Take value less than normal.Calculate the ratio between the engine speed and vehicle speed of each gear of gearbox k3i=n/V=(ig×i0)/(0.377×
R), each gear V can be obtainediCorresponding engine speed ni=k3i×Vi, ViUnit km/h, niUnit r/min.
(5) the engine accessory power rating consumption torsion of clutch, gearbox, compression pump, cold air pump, electronic-controlled power steering hydraulic pump is calculated
Square：It is located at rated engine speed neWhen annex consumption moment of torsion Mze=k4×Me=k4×Pe×9549/ne, unit Nm, Me
For the moment of torsion of engine power rating point, k4Torque coefficient, k are consumed for engine accessory power rating4In the range of 0.03~0.010, generally
Passenger car takes coefficient less than normal, and motor bus and engineering truck take coefficient bigger than normal.It is located at annex consumption during engine idling 700r/min
Moment of torsion is k5×Mze, k5It is engine idling annex consumption torque coefficient, k5In the range of 0.2~0.4, neTaken when less than normal bigger than normal
Value, neValue less than normal is taken when bigger than normal.Engine accessory power rating consumption moment of torsion M can be setzIt is first power or quadratic power with engine speed
Equation, from vehicle velocity ViN can be obtainedi, so as to calculate the engine accessory power rating consumption moment of torsion M for obtaining each speedzi。
(6) cruising mode's engine output P is calculatedti；During vehicle constant-speed driving, engine output is whole with vehicle
The resistance power sum of individual system is equal to reach the transmission resistance that constant speed is contained in balance, vehicle neutral position sliding resistance, without
Calculate drive line efficiency, each vehicle velocity ViEngine output Pti=ni×Mzi/9549+(Ffi+Fwi)×Vi/ 3600, unit
KW, PtiCorrespondence engine output torque Mti=9549 × Pti/ ni, unit Nm.
(7) the acceleration resistance F of accelerating mode is calculatedai：Because the automobile tumbler equivalent inertia of top gear is with respect to gross mass M
Ratio it is smaller, less, but the error estimated in bottom gear is very big for estimation error.So, if the initial velocity of accelerating mode
It is all higher to be such as not less than 40km/h, it can be calculated using gearbox highest speed gear or secondary highest speed gear, vehicle tumbler can be estimated
The equivalent inertia M of (containing engine)i=δ × m, units/kg；M be vehicle kerb weight, units/kg, coefficient δ be 0.03~
0.10, because the equivalent inertia of engine is directly proportional to the gearratio square of vehicle transmission system, taken during gearbox highest speed gear
Value less than normal, takes value bigger than normal during secondary highest speed gear, engineering truck takes value bigger than normal；
If the initial velocity of accelerating mode is smaller or is 0, to reduce MiWith the calculation error of acceleration resistance, hair should be measured
The rotary inertia I of motivatione, or the rotary inertia of engine flywheel is calculated, the rotary inertias such as bent axle, clutch are estimated, are added up
It is used as the rotary inertia I of enginee, calculate the engine equivalent inertia m of each gearei=ig 2×i0 2×Ie/R2, then using certainly
By any of which method with loading coastdown, different loading amount coastdown, increase and decrease inertia coastdown twice twice twice, survey
Measure transmission neutral PWTN equivalent inertia m0, estimate the equivalent inertia m of non-driving wheelf, so that obtaining gearbox respectively keeps off biography
It is dynamic to compare igAutomobile tumbler equivalent inertia Mi=m0+mf+mei=m0+mf+ig 2×i0 2×Ie/R2, units/kg.
(8) the acceleration resistance F that gearbox is respectively kept off is calculatedai=mei×a+(m0+mf+M)×a/(η0×η1), η1For gearbox
Transmission efficiency, η0For main reducing gear transmission efficiency, M is defined fully loaded gross mass, units/kg；A is the acceleration of accelerating mode,
A=Δs V/ (3.6 × Δ t), unit m/s2；Δ V is the vehicle speed range of accelerating mode, unit km/h；Δ t for accelerating mode when
Between scope, unit s；The speed and time range of accelerating mode can be all divided into multiple vehicle speed intervals Δ Vi and time interval
ti, the vehicle speed intervals generally divided can be (0.1~6) km/h, by ti=Δ Vi/ (3.6 × a) calculates the corresponding time.Very
Vehicle speed intervals when low velocity is spent should be larger, engine output is reached stable state, can be by when being spent compared with high initial speed
Divide vehicle speed intervals within per second or some second.Because the state of engine dynamic power is more disorderly, in the Dynamic fuel of equal-wattage
Consumption is more than steady state fuel consumption, and Engine Universal Characteristics are steady state power Fuel Consumptions, so, in accelerating mode car
Each vehicle speed intervals two ends that fast scope is divided, take the engine output P of larger speed pointai=ni×Mzi/9549+
(Ffi+Fwi+Fai)×Vi/ 3600 carry out calculated fuel consumption as the average steady state power of the vehicle speed intervals, are allowed to compensate the car
Fast interval dynamic power Fuel Consumption, PaiUnit kW, PaiCorrespondence engine torque Mai=9549 × Pai/ni。
(9) each speed specific fuel consumption g is determinedi：Artificial or computer is curve number from universal characteristic curve of engine
After change, using insertion, cruising mode n is obtainedi、Pti、MtiOr accelerating mode niAnd Pai、MaiCorresponding specific fuel consumption gi,
giUnit is gram/kilowatt-hour.Calculated fuel consumption Q=Pti×gi, unit is Grams Per Hour, according to the time t of each operating modei,
Each constant speed and the fuel consumption quality Q of accelerating mode can be calculatedm=Q × ti/ 3600, unit for gram.Similarly, if engine
CO, HC, NO of experimentxAfter characteristic curve digitlization, the discharge amount of exhaust gas value of constant speed and accelerating mode the examination of road can be calculated.
(10) Fuel Consumption of decelerating mode is calculated：The accelerator pedal position of decelerating mode in engine idle position,
If it is required that clutch combine and also gearbox hang up gear slow down when, engine speed with vehicle speed decline and gradually subtract
It is small, when engine speed stops to supply rotating speed n more than engine idlingtWhen Fuel Consumption be 0 or waste gas discharge be 0, work as engine
Rotating speed is less than ntWhen by engine idle fuel parameter calculated fuel consumption or by engine idle exhaust gas parameter calculate waste gas
Discharge, usual diesel engine ntAbout 750r/min, gasoline engine ntAbout 900r/min.If requiring to disengage in decelerating mode regulation
When clutch or gearbox hang up neutral deceleration, then engine is in rapidly idle position, idle by engine with the defined time
Fast fuel parameter calculated fuel consumption calculates waste gas discharge by engine idle exhaust gas parameter.
(11) Fuel Consumption of idling operation is calculated：With the defined time, calculate and fire by engine idle fuel parameter
Expect consumption or calculate waste gas discharge by engine idle exhaust gas parameter.
(12) according to each operating mode time, Fuel Consumption and/or waste gas sum, fuel density and total kilometres, can calculate many
The kilometric fuel consumption of the examination of road hundred of operating mode or hundred kilometers of discharge amount of exhaust gas.
Computer can calculate requirement programming more than, log in the associated technical parameters for examining new model, can calculate automatically
Vi、ni、Pti、Mti、Pai、Mai, after universal characteristic curve of engine or CO, HC, NOx characteristic curve digitization, using insertion
Method, computer calculates the examination of road Fuel Consumption or the waste gas discharge of multi-state automatically.
Automobile multi-state the examination of road oil consumption simulation calculates detection method, disappears without examined new model the examination of road or platform examination measurement fuel
Consumption or waste gas discharge, are associated technical parameters and defined constant speed, acceleration, deceleration, the idling multi-state according to vehicle, simulation
Calculate the detection method of vehicle multi-state the examination of road Fuel Consumption or waste gas discharge, it is characterised in that：With inspection new model phase
Pass technical parameter determines the class of vehicle belonging to it, the coefficient of rolling resistance f and the equation of speed counted by affiliated class of vehicle
And coefficient of air resistance CDWith the equation of speed, the rolling resistance F of each speed is calculatedfiWith air drag Fwi, according to tyre type
Number obtain tire and calculate radius, calculate the ratio between each gear engine speed of gearbox and vehicle speed k3i, each vehicle velocity V can be calculatedi
Corresponding engine speed ni=k3i×Vi, ViUnit km/h, niUnit r/min, setting engine accessory power rating consumes moment of torsion with starting
The equation of machine rotating speed, can obtain the engine accessory power rating consumption moment of torsion M of each speedzi；In cruising mode, the engine for calculating each speed is defeated
Go out power Pti=ni×Mzi/9549+(Ffi+Fwi)×Vi/ 3600, unit is kW, in accelerating mode, calculates starting for each speed
Machine power output Pai=ni×Mzi/9549+(Ffi+Fwi+Fai)×Vi/ 3600, FaiFor acceleration resistance, unit is N, is accelerating work
The each vehicle speed intervals divided in condition regulation vehicle speed range, take the power P of larger speed pointaiIt is used as being averaged for the vehicle speed intervals
Power, should be larger in the vehicle speed intervals of very low velocity degree, engine output is reached stable state；It is universal from engine
Artificial or computer, using insertion, obtains cruising mode n after curve data on characteristic curvei、Pti、MtiOr accelerate work
Condition ni、Pai、MaiCorresponding specific fuel consumption gi；In decelerating mode, when engine speed stops supplying rotating speed more than engine idling
Fuel Consumption is 0, calculates and fires by engine idle fuel parameter when engine speed stops supplying rotating speed less than engine idling
Expect consumption；In idling operation, calculated fuel consumption is come with engine idle fuel parameter；According to each operating mode time, fuel
Consumption sum, fuel density and total kilometres, can calculate the kilometric fuel consumption of the examination of road hundred of multi-state, or as needed may be used
Similarly to press CO, HC, NO of engine testxCharacteristic curve, the automatic waste gas discharge value for calculating multi-state the examination of road is applicable each
Plant fuel oil and fuel gas vehicle.Automobile multi-state the examination of road oil consumption simulation, which calculates detection method, has advantages below：
A, it can be stopped with idling for rotating speed come the strategy of putting into gear of specification decelerating mode, when being decelerated to relatively low speed from higher speed
When, n can be slightly above in the engine speed compared with high geartShi Yaoqiu downshifts make Fuel Consumption as 0 to improve rotating speed, until rule
It is fixed compared with low gear rotating speed close to ntWhen specification holdback clutch or hang neutral.
B, by the different the examination of road formula classified calculating of every kind of class of vehicle, improve the accuracy that simulation is calculated, Er Qieche
The quantity of classification is few, and the examination of road workload is also little, eliminates the influence of tire pressure, surface conditions, ambient condition etc., protects
The uniformity of detection state is demonstrate,proved.
C, ± 4% Fuel Consumption discreteness error for eliminating same engine model different product, without break-in drop
Calculated after low expense, dispersible inspection technology parameter, centralized and unified examination ＆ verification, it is not necessary to complicated supervisory systems.
Embodiment
By GB/T12545.2-2001《Commerial vehicle consumption trial method》Six Operation mode cycles of 5.1.1 moneys,
So that car new model one 11 meters long calculates fully loaded six Operation mode cycle the examination of road Fuel Consumptions as an example, to illustrate specific embodiment party
Formula.
1st, vehicle associated technical parameters：Kerb weight 11500kg, gross mass 15500kg, engine power rating/rotating speed
For 177kW/2300r/min, fuel is diesel oil, it is determined that six gear detections are hung, six gear gearratio igFor 0.740, single-stage final ratio
For 4.875, tyre model is 11.00R22.5, and tire classification is that radial-ply tyre section width is more than 8.25in, vehicle body length × wide ×
A height of 11270mm × 2490mm × 3520mm, front tread is 2020mm, calculates fully loaded multi-state the examination of road Fuel Consumption.
2nd, each speed point V is determinedi：It is 5km/h to divide vehicle speed intervals in accelerating mode, calculates time interval and is：(40~
50) deceleration a=10/ (3.6 × 14.0)=0.198m/s of km/h accelerating modes2, the time t of correspondence 5km/h vehicle speed intervalsi
=5/ (3.6 × 0.198)=7.0s.(50~60) km/h accelerating modes deceleration a=10/ (3.6 × 16.3)=
0.170m/s2, the time t of correspondence 5km/h vehicle speed intervalsi=5/ (3.6 × 0.17)=8.17s.
3rd, tyre model 11.00R22.5 tyre width is 279mm, and outer diameter D is 1065mm, fully loaded to take k2=0.93, wheel
Tire section width 279/25.4=10.98in ＞ 8.25in, R=0.5 × 0.93 × 1065 × 10-3=0.4952m.Calculate the gear
The ratio between the rotating speed and speed of position k3=(ig×i00.377 × R of)/()=(0.740 × 4.875)/(0.377 × 0.4952)=
19.323。
4th, engine accessory power rating consumption moment of torsion is calculated：If k4=0.08, Mze=k4×Pe×9549/ne=0.08 × 177 ×
9549/2300=58.79, if k5=0.3, if engine accessory power rating consumption moment of torsion is the first power of rotating speed, annex consumption moment of torsion is straight
Line slope tgB=(1-0.3) × Mze/(ne- 700), niThe M of rotating speed pointzi=0.3 × Mze+(ni-700)×tgB。
5th, coefficient of rolling resistance and rolling resistance are calculated：By the f and speed linear function f=of affiliated class of vehicle
0.00468+0.000024 × V, vehicle is single-stage main transmission, takes drive mechanism coefficient k1=1, rolling resistance Ffi=fi×M×
g。
6th, coefficient of air resistance and air drag are calculated：By the C of affiliated class of vehicleDWith speed quadratic equation CD=
1.2238-0.0101V+0.0000525V2, front face area A=2020 × 3520 × 10-6=7.1104m2, V0 2=Vi 2/ 12.96,
Air drag Fwi=0.5 × CDi×A×ρ×Vi 2/12.96。
7th, cruising mode's engine output P is calculatedti=ni×Mzi/9549+(Ffi+Fwi)×Vi/ 3600, most at a high speed
Gear detection can estimate δ=0.04, if η1=0.95, η0=0.96, Fai=(0.04 × 11500+15500) × a/ (0.95 ×
0.96)=17500 × a, calculates accelerating mode engine output Pai=ni×Mzi/9549+(Ffi+Fwi+Fai)×Vi/
3600, PaiCorrespondence moment of torsion Mai=9549 × Pai/ni, unit Nm.
8th, using insertion, the n of cruising mode is obtained from universal characteristic curve of enginei、Pti、MtiWith accelerating mode
ni、Pai、MaiCorresponding specific fuel consumption gi, giUnit is gram/kilowatt-hour.Or computer is universal characteristic curve of engine
Automatically corresponding g is calculated after digitizationi, result of calculation is tabulated below：
9th, by Qm=Pti×gi×ti/ 3600 calculate the interval fuel consumption quality of each constant speed：Qm40=16.3 × 238 ×
11.3/3600=12.214 grams, Qm50=27.955 grams, Qm60=32.259 grams.Calculate the fuel of each vehicle speed intervals of accelerating mode
Consume quality：Qm45=28.395 grams, Qm50=30.794 grams, Qm55=36.186 grams, Qm60=40.443 grams.Footmark is speed：
10th, provided by standard, loosen accelerator pedal completely in deceleration, clutch is still engaged, and gearbox hangs up high gear.
The minimum speed of decelerating mode of six operating mode is 40km/h, and correspondence diesel engine speed is that 773r/min stops supplying rotating speed more than idling
750r/min, decelerating mode Fuel Consumption is 0.Six operating mode does not have idling operation, and idling operation Fuel Consumption is 0.
11st, the Fuel Consumption gross mass of computational rules multi-state is 208.246 grams, by the diesel oil density under normal condition
0.830 grams per milliliter is scaled 208.246/0.830=250.8991mL, and total kilometres are 1350m, calculate the examination of road of six operating mode
Hundred kilometric fuel consumptions are 100000 × 250.899/ (1000 × 1350)=18.59L/100km.
12nd, similarly, by the engine output, moment of torsion, rotating speed of above-mentioned calculating, using insertion, from engine test
CO, HC, NOxIn characteristic curve, the discharge amount of exhaust gas value of multi-state the examination of road can be calculated.
Automobile multi-state the examination of road oil consumption simulation calculates detection method, the energy-conservation of automobile and emission reduction can be organically combined
Come, have the advantages that to examine accurate, good operability, low convenient and swift, expense, uniformity and comparativity good.
Claims (1)
1. automobile multi-state the examination of road oil consumption simulation calculates detection method, without examined new model the examination of road or platform examination measurement fuel consumption
Amount or waste gas discharge, are associated technical parameters and defined constant speed, acceleration, deceleration, the idling multi-state according to vehicle, simulation meter
Calculate the detection method of vehicle multi-state the examination of road Fuel Consumption or waste gas discharge, it is characterised in that：With inspection new model tire
Classification, body categories, quality category associated technical parameters determine the class of vehicle belonging to it, and every kind of class of vehicle is at least with one
New model the examination of road, hangs up neutral position sliding after gearbox highest speed gear to max. speed, measures the vehicle row of every 10 integer speed point
Resistance is sailed, rolling resistance, air drag and the examination of road viscous drag correction coefficient are calculated using least square method, and whole coefficients all schools
Just in reference atmosphere state, coefficient of rolling resistance f and the linear function or quadratic equation of speed are calculated, coefficient of air resistance is calculated
CDWith the linear function or quadratic equation of speed, and the identical correction coefficient equation of all new models of same class of vehicle is used as；
The coefficient of rolling resistance f and the equation and coefficient of air resistance C of speed counted by affiliated class of vehicleDWith the equation of speed,
Calculate the rolling resistance F of each speedfiWith air drag Fwi；Tire is obtained according to tyre model and calculates radius, gearbox is calculated each
The ratio between gear engine speed and vehicle speed k3i, each vehicle velocity V can be calculatediCorresponding engine speed ni=k3i×Vi, ViUnit
Km/h, niUnit r/min, with annex consumption moment of torsion during rated engine speed and engine idling annex consumption moment of torsion system
The equation of number, setting engine accessory power rating consumption moment of torsion and engine speed, calculates ViThe engine accessory power rating consumption moment of torsion of speed point
Mzi；In cruising mode, the engine output P of each speed is calculatedti=ni×Mzi/9549+(Ffi+Fwi)×Vi/ 3600, it is single
Position is kW, in accelerating mode, calculates the engine output P of each speedai=ni×Mzi/9549+(Ffi+Fwi+Fai)×Vi/
3600, FaiFor acceleration resistance, to reduce the calculation error of acceleration resistance, the rotary inertia I of engine should be measurede, or calculate
The rotary inertia of engine flywheel, estimates the rotary inertias such as bent axle, clutch, the rotary inertia I added up as enginee, meter
Calculate the engine equivalent inertia m of each gearei=ig 2×i0 2×Ie/R2, igFor the gearratio of gearbox gear, i0For main transmission
Than measurement transmission neutral PWTN equivalent inertia m0, estimate the equivalent inertia m of non-driving wheelf, units/kg, or ought adopt
During with gearbox highest speed gear or secondary highest speed gear to calculate, the vehicle tumbler equivalent inertia M containing engine can be estimatedi=δ
× m, units/kg；M is the kerb weight of vehicle, and units/kg, coefficient δ is 0.03~0.10, acceleration resistance Fai=mei×a+(m0+
mf+M)×a/(η0×η1), M is that defined vehicle is fully loaded with gross mass, units/kg, η1For gearbox transmission efficiency, η0Based on slow down
Device transmission efficiency, a is the acceleration of accelerating mode；The each vehicle speed intervals divided in accelerating mode regulation vehicle speed range,
Take the power P of larger speed pointaiIt is used as the mean power of the vehicle speed intervals；The artificial or calculating from universal characteristic curve of engine
Machine is after curve data, using insertion, obtains cruising mode ni、Pti、MtiOr accelerating mode ni、Pai、MaiCorresponding fuel
Consumption rate gi, MtiFor PtiCorresponding engine output torque；In decelerating mode, when engine speed stops to supply more than engine idling
Fuel Consumption is 0 during rotating speed, when engine speed stops supplying rotating speed less than engine idling by engine idle fuel parameter
Calculated fuel consumption；In idling operation, calculated fuel consumption is come with engine idle fuel parameter；During according to each operating mode
Between, Fuel Consumption sum, fuel density and total kilometres, the kilometric fuel consumption of the examination of road hundred of multi-state, Huo Zhegen can be calculated
CO, HC, NO of engine test can be similarly pressed according to needsxCharacteristic curve, the automatic waste gas discharge value for calculating multi-state the examination of road,
Applicable various fuel oils and fuel gas vehicle.
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| CN108204841B (en) * | 2016-12-16 | 2019-09-10 | 中联重科股份有限公司 | Concrete mixing and transporting car oil consumption appraisal procedure and device and agitator truck |
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| CN109388775B (en) * | 2017-08-14 | 2023-11-21 | 厦门雅迅网络股份有限公司 | Engine loss calculation method and engine loss calculation device |
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