CN104198005A - Method for analog computation and detection of road test fuel consumption of vehicle in multiple working conditions - Google Patents
Method for analog computation and detection of road test fuel consumption of vehicle in multiple working conditions Download PDFInfo
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Abstract
The invention provides a method for analog computation and detection of the road test fuel consumption of a vehicle in multiple working conditions. According to the method, the rolling resistance and the air resistance of each speed of the vehicle of a new type are calculated according to the rolling resistance coefficient equation and the air resistance coefficient equation of the type of the vehicle, the consumption torque and the acceleration resistance of an engine accessory are worked out, and then the output power, the torque and the rotating speed of an engine at each speed of the vehicle in the constant speed working condition and in the acceleration working condition can be obtained; the fuel consumption in the multiple working conditions is worked out according to the specific fuel consumption corresponding to the universal characteristic curve of the engine, the dynamic power fuel consumption is compensated for through calculation according to a high drive power within a vehicle speed section, the drive power is higher within a section with a quite low initial speed, so that the output power of the engine is in the stable state, the fuel consumption in the deceleration working condition is determined according to the relation between the engine rotating speed and the idling cut-off rotating speed, and the fuel consumption in the idling condition is worked out according to the idling fuel parameters of the engine; in this way, the fuel consumption or exhaust emission of road tests in the multiple working conditions is automatically worked out.
Description
Technical field
Automobile multi-state road formation testing consumption analog computation detection method, the new model of examining without road examination or bench teat, by coefficient of air resistance equation and the coefficient of rolling resistance equation of affiliated class of vehicle, with a kind of detection method of vehicle correlation technique calculation of parameter constant speed, acceleration, deceleration, idling multi-state road examination Fuel Consumption or toxic emission, belong to the technical field of automotive performance detection method.
Background technology
Prior art detects new model multi-state road examination Fuel Consumption, normally by GB GB/T12545.2-2001 < < commerial vehicle consumption trial method > > and GB/T27840-2011 < < heavy type commercial vehicle Fuel Consumption measuring method > >, at each regulation constant speed, acceleration, deceleration, idling multi-state, measure road examination Fuel Consumption.Its weak point is: the vehicle break-in expense of the examination of (1) road and bench teat is large, and proving time is long.(2) road examination detection Fuel Consumption is affected by the factors such as pavement conditions, wind-force, and the running resistance of vehicle, engine capacity and Fuel Consumption are affected by environment temperature, atmospheric pressure etc.(3) computing method regardless of vehicle body classification C
derror as definite value is larger, and the error of estimation bottom gear automobile tumbler equivalent inertia is too large.(4) it is very poor that bench teat and computing method do not have the operability of standard gear, in the very low speed of a motor vehicle of accelerating mode, is difficult to by the rich rate of calculated torque per second.(5) bench teat is difficult to the inertia acceleration resistance of the fully loaded heavy goods vehicles of simulation.For overcoming the deficiencies in the prior art, adopt automobile multi-state road formation testing consumption analog computation detection method, by the correlation technique parameter of the new model of examining and the multi-state analog computation road of regulation examination Fuel Consumption or toxic emission.
Summary of the invention
Test shows, the vehicle road coefficient of rolling resistance f of identical tire classification is approximately equal, the coefficient of air resistance C of identical vehicle body classification
dalso approximately equal.Can be within the scope of certain gross mass within the scope of (lorry) or length of wagon (passenger vehicle), the vehicle of identical vehicle body classification and identical tire classification is incorporated into as same vehicle classification, and coefficient of rolling resistance equation and the coefficient of air resistance equation of all new models of same class of vehicle are all identical.By the correlation technique parameter of new model and multi-state road examination requirement analog computation Fuel Consumption or toxic emission, be applicable to manual transmission vehicle.The road try of various class of vehicle statistics is suddenly as follows:
1, can it be three kinds tire category division: bias tire, radial-ply tyre deflected width of tyre < 8.25in, radial-ply tyre deflected width of tyre >=8.25in, passenger vehicle adopts radial-ply tyre conventionally.Passenger vehicle and articulated coach can be divided vehicle body classification by length, and lorry can be divided vehicle body classification 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 (as concrete mixer); Because bus body length has comprised qualitative factor, so without dividing again quality category, but lorry also needs by specified gross mass M, to divide a plurality of quality categories again: as M < 10000kg, 10000kg≤M < 15000kg, M >=15000kg, passenger car can be divided class of vehicle by Reference mass.By actual conditions, with different tire classifications, vehicle body classification, quality category, be appropriately combined into different class of vehicle.
2, every kind of class of vehicle is at least with a new model road examination, hang up the top gear of wheel box to neutral position sliding after max. speed, vehicle can be fully loaded with, single-stage main transmission, measure the Vehicle Driving Cycle resistance of every 10 integer speed of a motor vehicle points, can adopt least square method to calculate resistance to rolling, air resistance and road examination viscous drag correction coefficient, obtain coefficient of rolling resistance and the coefficient of air resistance of each 10 integer speed of a motor vehicle point, and whole coefficients are all proofreaied and correct at reference atmosphere state, temperature is 20 ℃; The corrected value of atmospheric pressure 100kPa.
3, calculate linear function or the quadratic equation of f and the speed of a motor vehicle, calculate C
dlinear function or quadratic equation with the speed of a motor vehicle.If same class of vehicle has the test of many new models, the calculating regression equation of averaging, speed of a motor vehicle unit is km/h, and as the identical correction coefficient equation of all new models of same class of vehicle.
When any new model, need check multi-state road examination Fuel Consumption or toxic emission, by following specific requirement, calculate:
(1) by vehicle correlation technique parameter, determine affiliated class of vehicle and corresponding f formula and C
dformula: vehicle model; Vehicle body classification; Kerb weight m, units/kg; Gross mass M, units/kg; Rating of engine P
e/ rated speed n
e, the kW of unit and r/min; The ratio of gear i of each gear of wheel box
g; Single-stage or twin-stage final ratio i
0; Tyre model specification; Body dimensions: length * wide * height, the mm of unit; Detect vehicle velocity V
i, the km/h of unit; Front tread, the mm of unit.
(2) calculate resistance to rolling: the coefficient of rolling resistance f that calculates each speed of a motor vehicle by the f equation of affiliated class of vehicle
iwith resistance to rolling F
fi=k
1* f
i* M * g; Wherein: k
1for drive mechanism coefficient, in 1～1.04 scope, single-stage main transmission gets 1, and twin-stage main transmission or duplex are driven bridge and got that to be greater than 1, g be acceleration of gravity, desirable 9.81m/s
2.
(3) calculate air resistance: by the C of same vehicle classification
dequation calculates the coefficient of air resistance C of each speed of a motor vehicle
diwith air resistance F
wi=0.5 * C
di* A * ρ * V
0 2, A is vehicle front face area, unit square rice, atmospheric density ρ=1.189Ns
2m
-4, vehicle velocity V
0unit is m/s, V
0 2=V
i 2/ 12.96, V
iunit is km/h.
(4) calculation engine rotating speed: according to tyre model specification, can obtain tire outside diameter D, determine that wheel calculates radius R=0.5 * k
2* D, unit rice, k
2for tire calculates radius coefficient, k
2in 0.92～0.96 scope, value bigger than normal is got in zero load, is fully loaded with and gets value less than normal.Calculate the engine speed of each gear of wheel box and the ratio k of vehicle speed
3i=n/V=(i
g* i
0)/(0.377 * R), can obtain each gear V
icorresponding engine speed n
i=k
3i* V
i, V
ithe km/h of unit, n
ithe r/min of unit.
(5) calculate the engine accessory power rating consumption moment of torsion of clutch coupling, wheel box, compression pump, cold air pump, power steering hydraulic pump: be located at rated engine speed n
etime annex consume moment of torsion M
ze=k
4* M
e=k
4* P
e* 9549/ne, the Nm of unit, M
efor the moment of torsion of rating of engine point, k
4for engine accessory power rating consumes torque coefficient, k
4in 0.03～0.010 scope, passenger car is got coefficient less than normal conventionally, and motor bus and engineering truck are got coefficient bigger than normal.It is k that annex while being located at engine idle 700r/min consumes moment of torsion
5* M
ze, k
5that engine idle annex consumes torque coefficient, k
5in 0.2～0.4 scope, n
ewhen less than normal, get value bigger than normal, n
ewhen bigger than normal, get value less than normal.Can set engine accessory power rating and consume moment of torsion M
zwith engine speed be the equation of first power or quadratic power, from vehicle velocity V
ican obtain n
ithereby the engine accessory power rating that can calculate each speed of a motor vehicle consumes moment of torsion M
zi.
(6) calculate cruising mode's engine output P
ti; During vehicle constant-speed driving, engine output equates to reach balance with the resistance power sum of vehicle whole system, and the transmission resistance that has comprised constant speed in vehicle neutral position sliding resistance, without calculating drive line efficiency, each vehicle velocity V
iengine output P
ti=n
i* M
zi/ 9549+ (F
fi+ F
wi) * V
i/ 3600, the kW of unit, P
ticorresponding engine output torque M
ti=9549 * P
ti/ ni, the Nm of unit.
(7) calculate the acceleration resistance Fai of accelerating mode: because the ratio of the relative gross mass M of automobile tumbler equivalent inertia of top gear is less, estimation error is little, but the error of estimating is very large when bottom gear.So, if the initial velocity of accelerating mode is all higher as be not less than 40km/h, can adopt the top gear of wheel box or inferior top gear to calculate, equivalent inertia M that can estimating vehicle tumbler (containing engine)
i=δ * m, units/kg; M is the kerb weight of vehicle, units/kg, and coefficient δ is 0.3～0.10, because the equivalent inertia of engine is to be directly proportional to the ratio of gear square of vehicle transmission system, during the top gear of wheel box, get value less than normal, during inferior top gear, get value bigger than normal, engineering truck is got value bigger than normal;
If the initial velocity of accelerating mode is less or be 0, for reducing M
iwith the error of calculation of acceleration resistance, should measure the moment of inertia I of engine
e, or the moment of inertia of calculation engine flywheel, the moment of inertia such as estimation bent axle, clutch coupling, the cumulative moment of inertia I as engine
e, calculate the engine equivalent inertia mei=i of each gear
g 2* i
0 2* I
e/ R
2, then adopt wherein any method free and twice coastdown of loading, twice coastdown of different loading amount, twice coastdown of increase and decrease inertia, measure wheel box neutral power train equivalent inertia m
0, the equivalent inertia m of estimation non-driving wheel
fthereby, obtain wheel box and respectively keep off ratio of gear i
gautomobile tumbler equivalent inertia M
i=m
0+ m
f+ mei=m
0+ m
f+ i
g 2* i
0 2* I
e/ R
2, units/kg.
(8) calculate the acceleration resistance Fai=(M of each gear of wheel box
i+ M) * a/ (η
0* η
1), η
1for wheel box transmission efficiency, η
0for main reducing gear transmission efficiency, M is the fully loaded gross mass of regulation, units/kg; A is the acceleration of accelerating mode, a=△ V/ (3.6 * △ t), the m/s of unit
2; △ V is the vehicle speed range of accelerating mode, the km/h of unit; △ t is the time range of accelerating mode, the s of unit; The speed of a motor vehicle of accelerating mode and time range all can be divided into the interval △ Vi of a plurality of speed of a motor vehicle and time interval t
i, the speed of a motor vehicle interval of conventionally dividing can be for (0.1～6) km/h, by t
i=△ Vi/ (3.6 * a) calculate the corresponding time.Speed of a motor vehicle interval when very low velocity is spent should be larger, makes engine output reach steady state (SS), can be by per second or some seconds division speed of a motor vehicle intervals when spending compared with high initial speed.Because the state of engine dynamic power is more disorderly, dynamic Fuel Consumption at equal-wattage is greater than stable state Fuel Consumption, Engine Universal Characteristics is steady state power Fuel Consumption, so, interval two ends of each speed of a motor vehicle of dividing at accelerating mode vehicle speed range, get the engine output P of larger speed of a motor vehicle point
ai=n
i* M
zi/ 9549+ (F
fi+ F
wi+ F
ai) * V
i/ 3600 average steady state power as this speed of a motor vehicle interval carry out calculated fuel consumption, make it to compensate the dynamic power Fuel Consumption in this speed of a motor vehicle interval, P
aithe kW of unit, P
aicorresponding engine torque M
ai=9549 * P
ai/ ni.
(9) determine each speed of a motor vehicle specific fuel consumption g
i: from universal characteristic curve of engine, artificial or computing machine, after curve data, adopts insertion, obtains cruising mode n
i, P
ti, M
tior accelerating mode n
iand P
ai, M
aicorresponding specific fuel consumption g
i, g
iunit is gram/kilowatt-hour.Calculated fuel consumption Q=P
ti* g
i, unit is Grams Per Hour, according to the time t of each operating mode
i, can calculate the fuel consumption quality Q of each constant speed and accelerating mode
m=Q * t
i/ 3600, unit is gram.In like manner, if after the CO of engine test, HC, the digitizing of NOx family curve, can calculate the toxic emission value of constant speed and the examination of accelerating mode road.
(10) calculate the Fuel Consumption of decelerating mode: the accelerator pedal position of decelerating mode is in engine idle position, if while requiring clutch coupling combination and wheel box to hang up gear deceleration, engine speed declines with vehicle speed and reduces gradually, when engine speed is greater than engine idle, stops for rotation speed n
ttime Fuel Consumption be 0 or toxic emission be 0, when engine speed is less than n
tin time, presses engine idle fuel parameter calculated fuel consumption or calculates toxic emission by engine idle exhaust gas parameters, conventionally diesel engine n
tbe about 750r/min, gasoline engine n
tbe about 900r/min.If when decelerating mode regulation requires holdback clutch or wheel box to hang up neutral deceleration, engine is rapidly in idle position, with official hour, by engine idle fuel parameter calculated fuel consumption or press engine idle exhaust gas parameters and calculate toxic emission.
(11) calculate the Fuel Consumption of idling operation: with official hour, by engine idle fuel parameter calculated fuel consumption or press engine idle exhaust gas parameters calculating toxic emission.
(12), according to each operating mode time, Fuel Consumption sum or waste gas sum, fuel density and total kilometres, can calculate the road of multi-state and try hundred kilometric fuel consumptions or hundred kilometers of discharge amount of exhaust gas.
Computing machine can be by above calculation requirement programming, and the correlation technique parameter of the login new model of examining, can calculate V automatically
i, n
i, P
ti, M
ti, P
ai, M
ai, after universal characteristic curve of engine or CO, HC, the datumization of NOx family curve, adopting insertion, computing machine calculates road examination Fuel Consumption or the toxic emission of multi-state automatically.
Automobile multi-state road formation testing consumption analog computation detection method, without the examination of examined new model road or bench teat, measure Fuel Consumption or toxic emission, according to the constant speed of the correlation technique parameter of vehicle and regulation, acceleration, deceleration, idling multi-state, the detection method of analog computation vehicle multi-state road examination Fuel Consumption or toxic emission, it is characterized in that: with the correlation technique parameter of examined new model, determine the class of vehicle under it, by the coefficient of rolling resistance f of affiliated class of vehicle statistics and equation and the coefficient of air resistance C of the speed of a motor vehicle
dwith the equation of the speed of a motor vehicle, calculate the resistance to rolling F of each speed of a motor vehicle
fiwith air resistance F
wi, according to tyre model, obtain tire and calculate radius, calculate the ratio k of each gear engine speed of wheel box and vehicle speed
3i, can calculate each vehicle velocity V
icorresponding engine speed n
i=k
3i* V
i, V
ithe km/h of unit, n
ithe r/min of unit, sets the equation that engine accessory power rating consumes moment of torsion and engine speed, and the engine accessory power rating that can obtain each speed of a motor vehicle consumes moment of torsion M
zi; Cruising mode, calculate the engine output P of each speed of a motor vehicle
ti=n
i* M
zi/ 9549+ (F
fi+ F
wi) * V
i/ 3600, unit is kW, at accelerating mode, calculates the engine output P of each speed of a motor vehicle
ai=n
i* M
zi/ 9549+ (F
fi+ F
wi+ F
ai) * V
i/ 3600, Fai is acceleration resistance, and unit is N, and each speed of a motor vehicle of dividing in accelerating mode regulation vehicle speed range is interval, the power P of getting larger speed of a motor vehicle point
aias the average power in this speed of a motor vehicle interval, very the speed of a motor vehicle interval of low velocity degree should be larger, make engine output reach steady state (SS); From universal characteristic curve of engine, artificial or computing machine, after curve data, adopts insertion, obtains cruising mode n
i, P
ti, M
tior accelerating mode n
i, P
ai, M
aicorresponding specific fuel consumption g
i; At decelerating mode, when engine speed is greater than engine idle, to stop Fuel Consumption when the rotating speed be 0, when engine speed is less than engine idle and stops for rotating speed by engine idle fuel parameter calculated fuel consumption; At idling operation, with engine idle fuel parameter, carry out calculated fuel consumption; According to each operating mode time, Fuel Consumption sum, fuel density and total kilometres, can calculate the road of multi-state and try hundred kilometric fuel consumptions, or as required can be in like manner by CO, HC, the NOx family curve of engine test, automatically calculate the toxic emission value of multi-state road examination, applicable various fuel oils and fuel gas vehicle.Automobile multi-state road formation testing consumption analog computation detection method has the following advantages:
A, can stop carrying out the strategy of putting into gear of standard decelerating mode for rotating speed by idling, when being decelerated to the lower speed of a motor vehicle from the higher speed of a motor vehicle, can be in the engine speed of higher gear a little more than n
tshi Yaoqiu downshift be take and improved rotating speed and make Fuel Consumption as 0, until regulation approaches n compared with low gear rotating speed
ttime standard holdback clutch or hang neutral.
B, by the different road examination formula classified calculating of every kind of class of vehicle, improved the accuracy of analog computation, and the quantity of class of vehicle is few, road examination workload is also little, eliminate the impact of tire pressure, road surface situation, ambient condition etc., guaranteed the unitarity of detected state.
C, eliminated same engine model different product ± 4% Fuel Consumption discreteness error, without break-in, reduced expense, calculate after dispersibling inspection technology parameter, centralized and unified audit, does not need complicated supervisory systems.
Embodiment
Press six Operation mode cycles of GB/T12545.2-2001 < < commerial vehicle consumption trial method > > 5.1.1 money, it is example that the passenger vehicle new model of 11 meters long of take calculates fully loaded six Operation mode cycle roads examination Fuel Consumptions, and embodiment is described.
1, vehicle correlation technique parameter: kerb weight 11500kg, gross mass 15500kg, rating of engine/rotating speed is 177kW/2300r/min, fuel is diesel oil, determines that hanging six gears detects, six gear ratio of gear i
gbe 0.740, single-stage final ratio is 4.875, and tyre model is 11.00R22.5, tire classification is that radial-ply tyre section width is greater than 8.25in, vehicle body length * wide * height is 11270mm * 2490mm * 3520mm, and front tread is 2020mm, calculates fully loaded multi-state road examination Fuel Consumption.
2, determine each speed of a motor vehicle point V
i: at accelerating mode, dividing speed of a motor vehicle interval is 5km/h, and computing time, interval was: at retarded velocity a=10/ (3.6 * the 14.0)=0.198m/s of (40～50) km/h accelerating mode
2, the time t in corresponding 5km/h speed of a motor vehicle interval
i=5/ (3.6 * 0.198)=7.0s.Retarded velocity a=10/ (3.6 * 16.3)=0.170m/s at (50～60) km/h accelerating mode
2, the time t in corresponding 5km/h speed of a motor vehicle interval
i=5/ (3.6 * 0.17)=8.17s.
3, the tyre width of tyre model 11.00R22.5 is 279mm, and outer diameter D is 1065mm, the fully loaded k that gets
2=0.93, deflected width of tyre 279/25.4=10.98in > 8.25in, R=0.5 * 0.93 * 1065 * 10
-3=0.4952m.Calculate the rotating speed of this gear and the ratio k of the speed of a motor vehicle
3=(i
g* i
0)/(0.377 * R)=(0.740 * 4.875)/(0.377 * 0.4952)=19.323.
4, calculation engine annex consumes moment of torsion: establish k
4=0.08, M
ze=k
4* P
e* 9549/n
e=0.08 * 177 * 9549/2300=58.79, establishes k
5=0.3, establishing engine accessory power rating consumption moment of torsion is the first power of rotating speed, and annex consumes moment of torsion straight slope t
gb=(1-0.3) * M
ze/ (n
e-700), n
ithe M of rotating speed point
zi=0.3 * M
ze+ (n
i-700) * t
gb.
5, calculate coefficient of rolling resistance and resistance to rolling: by f and the speed of a motor vehicle linear function f=0.00468+0.000024 * V of affiliated class of vehicle, vehicle is single-stage main transmission, gets drive mechanism coefficient k
1=1, resistance to rolling F
fi=f
i* M * g.
6, calculate coefficient of air resistance and air resistance: by the C of affiliated class of vehicle
dwith speed of a motor vehicle quadratic equation C
d=1.2238-0.0101V+0.0000525V
2, front face area A=2020 * 3520 * 10
-6=7.1104m
2, V
0 2=V
i 2/ 12.96, air resistance F
wi=0.5 * C
di* A * ρ * V
i 2/ 12.96.
7, calculate cruising mode's engine output P
ti=n
i* M
zi/ 9549+ (F
fi+ F
wi) * V
i/ 3600, top gear detects can estimate δ=0.04, establishes η
1=0.95, η
0=0.96, F
ai=(0.04 * 11500+15500) * a/ (0.95 * 0.96)=17500 * a, calculates accelerating mode engine output P
ai=n
i* M
zi/ 9549+ (F
fi+ F
wi+ F
ai) * V
i/ 3600, P
aicorresponding moment of torsion M
ai=9549 * P
ai/ n
i, the Nm of unit.
8, adopt insertion, from universal characteristic curve of engine, obtain cruising mode's n
i, P
ti, M
tin with accelerating mode
i, P
ai, M
aicorresponding specific fuel consumption g
i, g
iunit is gram/kilowatt-hour.Or computing machine is automatically calculating corresponding g after universal characteristic curve of engine datumization
i, result of calculation is listed in to following table:
9, press Q
m=P
ti* g
i* t
i/ 3600 calculate the fuel consumption quality in each constant speed interval: Q
m40=16.3 * 238 * 11.3/3600=12.214 gram, Q
m50=27.955 grams, Q
m60=32.259 grams.Calculate the fuel consumption quality in each speed of a motor vehicle interval of accelerating mode: Q
m45=28.395 grams, Q
m50=30.794 grams, Q
m55=36.186 grams, Q
m60=40.443 grams.Footmark is the speed of a motor vehicle:
10, by standard regulation, loosen accelerator pedal in deceleration completely, clutch coupling still engages, and wheel box hangs up high gear.The minimum speed of a motor vehicle of decelerating mode of this six operating mode is 40km/h, and corresponding diesel engine speed is that 773r/min is greater than idling and stops for rotating speed 750r/min, and decelerating mode Fuel Consumption is 0.This six operating mode does not have idling operation, and idling operation Fuel Consumption is 0.
11, the Fuel Consumption gross mass of computational rules multi-state is 208.246 grams, by diesel oil density 0.830 grams per milliliter under normal condition, be scaled 208.246/0.830=250.8991mL, total kilometres are 1350m, and it is 100000 * 250.899/ (1000 * 1350)=18.59L/100km that hundred kilometric fuel consumptions are tried on the road of calculating this six operating mode.
12, in like manner, by the engine output of above-mentioned calculating, moment of torsion, rotating speed, adopt insertion, from CO, the HC of engine test, NOx family curve, can calculate the toxic emission value of multi-state road examination.
Automobile multi-state road formation testing consumption analog computation detection method, can and reduce discharging the energy-conservation of automobile and organically combine, have advantages of check accurately, good operability, convenient and swift, expense is low, unitarity and comparability good.
Claims (1)
1. the formation testing of automobile multi-state road consumes analog computation detection method, without the examination of examined new model road or bench teat, measure Fuel Consumption or toxic emission, according to the constant speed of the correlation technique parameter of vehicle and regulation, acceleration, deceleration, idling multi-state, the detection method of analog computation vehicle multi-state road examination Fuel Consumption or toxic emission, it is characterized in that: with the correlation technique parameter of examined new model, determine the class of vehicle under it, by the coefficient of rolling resistance f of affiliated class of vehicle statistics and equation and the coefficient of air resistance C of the speed of a motor vehicle
dwith the equation of the speed of a motor vehicle, calculate the resistance to rolling F of each speed of a motor vehicle
fiwith air resistance F
wi, according to tyre model, obtain tire and calculate radius, calculate the ratio k of each gear engine speed of wheel box and vehicle speed
3i, can calculate each vehicle velocity V
icorresponding engine speed n
i=k
3i* V
i, V
ithe km/h of unit, n
ithe r/min of unit, sets the equation that engine accessory power rating consumes moment of torsion and engine speed, and the engine accessory power rating that can obtain each speed of a motor vehicle consumes moment of torsion M
zi; Cruising mode, calculate the engine output P of each speed of a motor vehicle
ti=n
i* M
zi/ 9549+ (F
fi+ F
wi) * V
i/ 3600, unit is kW, at accelerating mode, calculates the engine output P of each speed of a motor vehicle
ai=n
i* M
zi/ 9549+ (F
fi+ F
wi+ F
ai) * V
i/ 3600, Fai is acceleration resistance, and unit is N, and each speed of a motor vehicle of dividing in accelerating mode regulation vehicle speed range is interval, the power P of getting larger speed of a motor vehicle point
aias the average power in this speed of a motor vehicle interval, very the speed of a motor vehicle interval of low velocity degree should be larger, make engine output reach steady state (SS); From universal characteristic curve of engine, artificial or computing machine, after curve data, adopts insertion, obtains cruising mode n
i, P
ti, M
tior accelerating mode n
i, P
ai, M
aicorresponding specific fuel consumption g
i; At decelerating mode, when engine speed is greater than engine idle, to stop Fuel Consumption when the rotating speed be 0, when engine speed is less than engine idle and stops for rotating speed by engine idle fuel parameter calculated fuel consumption; At idling operation, with engine idle fuel parameter, carry out calculated fuel consumption; According to each operating mode time, Fuel Consumption sum, fuel density and total kilometres, can calculate the road of multi-state and try hundred kilometric fuel consumptions, or as required can be in like manner by CO, HC, the NOx family curve of engine test, automatically calculate the toxic emission value of multi-state road examination, applicable various fuel oils and fuel gas vehicle.
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