CN105157991B - Wheel drive surfaces output regulation power loading detection method - Google Patents
Wheel drive surfaces output regulation power loading detection method Download PDFInfo
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- CN105157991B CN105157991B CN201510613622.6A CN201510613622A CN105157991B CN 105157991 B CN105157991 B CN 105157991B CN 201510613622 A CN201510613622 A CN 201510613622A CN 105157991 B CN105157991 B CN 105157991B
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Abstract
Wheel drive surfaces output regulation power loading detection method, it is automobile on chassis dynamometer, in vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, wheel drive surfaces output regulation power δ e × Pe or δ m × Pm under standard ambient condition is converted into respective drive power Fe or Fm under detection ambient condition, respective drive power respectively with Frame resistance, wheel roller frictional resistance, after the SR of three kinds of resistance sums of device for power absorption loading force reaches dynamic balance, dynamic property or waste gas discharge or Fuel Consumption are detected under speed steady working condition, so as to improve the uniformity and comparativity of assembling same model engine different automobile types detection.
Description
Technical field
Wheel drive surfaces output regulation power loading detection method, be automobile on chassis dynamometer, wheel drive surfaces are defeated
Go out the corresponding driving force of regulation power and the power of Frame resistance, wheel roller frictional resistance, device for power absorption loading resistance is put down
Under weighing apparatus, Steady state speed detection dynamic property or the method for waste gas discharge or Fuel Consumption, belong to car consumption credit technical field.
Background technology
Prior art《Provide wheel power detection method》, Chinese invention patent, the patent No.：ZL201210110890.2,
So-called automotive regulations wheel power does not include wheel roller friction horsepower, because the frictional resistance of wheel and roller is and vehicle wheel
Weight (or axle weight) is directly proportional, and wheel is again bigger, frictional resistance is bigger, and frictional resistance is also directly proportional to speed, and speed is higher, friction resistance
Power is bigger, assembles car, van, the drive shaft weight of plate washer lorry and the detection speed difference of same model engine very
Greatly, it is poor in identical regulation wheel power detection dynamic property or the uniformity and comparativity of waste gas discharge or Fuel Consumption.And
And this method is only applicable to the detection of rated power speed point, it is not suitable for the detection of peak torque speed point, is only applicable to yet
Diesel vehicle detects, and is not suitable for gasoline car detection.For overcome the deficiencies in the prior art, regulation power is exported using wheel drive surfaces
Detection method is loaded, driving force corresponding to wheel drive surfaces output regulation power is included and overcomes wheel roller frictional resistance, from
And improve the uniformity and comparativity of the various performance detections of automobile.
The content of the invention
Automobile is on chassis dynamometer, in vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, standard environment shape
Wheel drive surfaces output regulation power δ e × Pe or δ m × Pm is converted into detection ambient condition respective drive power Fe or Fm, Pe under state
For the rated power of engine, Pm is maximum engine torque point power, and δ e and δ m are respectively rated power point and peak torque
The regulation power coefficient of point, typically smaller than 0.75, make Frame resistance, wheel roller frictional resistance, device for power absorption loading force
The SR of three's sum is equal to driving force Fe or Fm, after wheel driving force and SR balance, is examined in Steady state speed
Dynamic property or waste gas discharge or Fuel Consumption are surveyed, it is comprised the following steps that：
1st, with the vehicle of the different kinds of tyre classification and different driving axle of bias tire or radial-ply tyre weight, on chassis dynamometer
Dismantle wheel drive semiaxis, the anti-trailer wheels of variable frequency drive motors to motor power-off after max. speed appoint a wheel art skating, use
Increase and decrease inertia coastdown or freely and loading coastdown or loads any method of coastdown twice twice twice twice, is surveyed
The wheel roller frictional resistance of each speed point is measured, divided by drive shaft can obtain the coefficient of frictional resistance fi of each speed point again, statistics can
Obtain bias tire or the resistance coefficient f of radial-ply tyre and the complete quadratic equation of speed in different driving axle weight scope.
Typically dynamic property or waste gas discharge are detected in the rated power point or maximum torque point of engine remarkable characteristic
Or Fuel Consumption, the excursion of two speeds is little, and coefficient of frictional resistance f changes are also little, can be reduced to, when speed is small
The coefficient of frictional resistance f of 50km/h speeds point is taken when equal to η50, the frictional resistance of 80km/h speeds point is taken when speed is more than η
Coefficient f80, usual η takes definite value in the range of 55km/h~75km/h, and the speed points of 50km/h and 80km/h two can be taken different
Drive shaft heavy phase weighs f and drive shaft unrelated with the average value of tire classification after simplifying, only with bias tire or the tire of radial-ply tyre
Classification is related.
2nd, rated power point vehicle velocity V e or maximum torque point vehicle velocity V m is determined, can be according to vehicle transmission system gearratio, car
Take turns the technical parameter calculating method of radius etc. and obtain, or obtained by measuring the standardization of engine speed and speed, Huo Zhetong
Cross same model series counting statistics and obtain, can also set gear device for power absorption on stand on automobile suspension and be not loaded with being surveyed
Engine speed corresponding to max. speed Va is approximately equal to engine maximum no load governed speed, and Ve is calculated by engine stabilizer speed change rate
=Φ × Va, Φ are engine stabilizer speed governing rate coefficient, can be chosen in the range of 0.94~0.82, diesel engine takes value bigger than normal, vapour
Oil machine takes value less than normal；, can be according to national standard GB/T1147.1-2007 after determining Ve《Internal-combustion engine of middle low power Part I：It is general
Technical conditions》3.9th section of regulation：The coefficient of torque reserve of Vehicular internal combustion engine should be greater than be equal to 10%, maximum torque point rotating speed with
The ratio between rated engine speed, low-speed truck and Vehicular internal combustion engine all should be less than being equal to 70%.Thus statistics can obtain Vm=θ × Ve or Vm
=θ × Φ × Va, θ can choose in the range of 0.7~0.6.
3rd, by wheel drive surfaces output regulation power δ e × Pe or δ m × Pm, meter under specification or required standard ambient condition
Calculate Ve or Vm speeds the wheel drive surfaces output driving power Fe or Fm in the case where detecting ambient condition, Fe=3600 × δ e × Pe/ (a
× Ve), Fm=3600 × δ m × Pm/ (a × Vm), a is power correction factor in formula.
4th, it is the known quantity of deposit computer in the Frame resistance Ft of Ve or Vm speeds point, drive shaft weight G can be obtained by weighing,
Unit is newton N, wheel roller frictional resistance Ff=G × f, unit N, if the loading force of device for power absorption is Fd, work as driving
Wheel surface driving force reaches balance and stable, the equilibrium equation in vehicle velocity V i with SR：Fe=Fte+Ffe+Fde, Fm=
Ftm+Ffm+Fdm, so, rated power point device for power absorption loading force Fde=Fe-Fte-Ffe, maximum torque point power is inhaled
Receiving apparatus loading force Fdm=Fm-Ftm-Ffm.
5th, detected in rated power, maximum throttle stable conditions vehicle velocity V i is typically not equal to Ve, when Vi is big in Fe mono- regularly
In equal to Ve, then wheel drive surfaces power output is more than equal to regulation power δ e × Pe, when Vi is less than Ve, then wheel drive surfaces export
Power is less than regulation power δ e × Pe, it is possible thereby to judge the dynamic property in rated power point wheel drive surfaces power output.
6th, detected in peak torque, can be in part oil when wheel drive surfaces power output is more than regulation power δ m × Pm
Vi is set to be more than and close to Vm under door operating mode, when wheel drive surfaces power output is less than regulation power, Vi under maximum throttle operating mode
It may stop working less than Vm even engines, it is possible thereby to judge the dynamic property in maximum torque point wheel drive surfaces power output.
Wheel drive surfaces output regulation power loading detection method, be automobile on chassis dynamometer, wheel drive surfaces are defeated
Go out the corresponding driving force of regulation power and Frame resistance, wheel roller frictional resistance, device for power absorption loading force three's sum
SR balance under, Steady state speed detection dynamic property or waste gas discharge or Fuel Consumption method, it is characterised in that：
Vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, wheel drive surfaces output regulation power δ e under standard ambient condition ×
Pe or δ m × Pm are converted into detection ambient condition respective drive power Fe or Fm, Fe=3600 × δ e × Pe/ (a × Ve), or Fm
=3600 × δ m × Pm/ (a × Vm), Pe are the rated power of engine, and Pm is maximum engine torque point power, and δ e and δ m divide
Not Wei rated power point and maximum torque point regulation power coefficient, a is power correction factor；By institute's inspection vehicle bias tire or
Radial-ply tyre different kinds of tyre type determines the wheel roller coefficient of frictional resistance fi of Ve or Vm speeds point, and drive shaft weight can be obtained by weighing
Measure G, unit N, wheel roller frictional resistance Ffi=G × fi, unit N, Frame resistance Fti be stored in computer known quantity, volume
Determine power points device for power absorption loading force Fde=Fe-Fte-Ffe, or maximum torque point device for power absorption loading force Fdm=
Fm-Ftm-Ffm, Fte and Ffe are respectively the Frame resistance and frictional resistance of rated power speed point, and Ftm and Ffm are respectively most
The Frame resistance and frictional resistance of high pulling torque speed point；Gas pedal is stable in maximum throttle position or part-throttle position
Afterwards, wheel drive surfaces driving force reaches balance with SR and stablized in vehicle velocity V i, can be according to sizes of the Vi with respect to Ve or Vm
To judge size of the wheel drive surfaces power output with respect to regulation power.With following technical characterstic：
(1) in vehicle dynamic quality or waste gas discharge or the detection of Fuel Consumption, if specification or requiring driving wheel table
The ratio between face power output and engine power rating are not less than certain limit value with maximum engine torque power ratio, then can be limit
Value is as regulation power coefficient δ e or δ m.
(2) in the detection of automobile emission or Fuel Consumption, generally to ensure that the dynamic property of vehicle is qualified, can root
Steady state speed Vi judges whether dynamic property is qualified when being balanced according to maximum throttle pedal position driving force with SR.
(3) detected in maximum torque point, power δ m × Pm are provided when wheel drive surfaces power output is more than, in gas pedal
Portion detection can make Vi be more than or equal to Vm, be advantageous to improve detection security.
(4) in the various performance detections of automobile, the concentrated expression skill of each part of engine, engine accessory power rating, power train
Art situation, after these component technology situation degradations, the possible unqualified or waste gas discharge of wheel drive surfaces power output is not
Qualified or Fuel Consumption is unqualified.
(5) in-use automotive is when peak torque speed point detects, if it is known that engine power rating but unknown peak torque
During with corresponding rotating speed, 10% can be equal to by the coefficient of torque reserve of Vehicular internal combustion engine, maximum torque point rotating speed and rated engine speed it
Than carrying out more accurately estimating engine maximum torque point power P m=1.10 × 0.65 × Pe=0.715Pe for 0.65.
Embodiment
Illustrate the embodiment of wheel drive surfaces output regulation power loading detection method, bavin by taking diesel vehicle as an example
Oily car parameter：Engine power rating is 169kW, radial-ply tyre, it is assumed that the regulation power of rated power point and maximum torque point
Coefficient δ e=δ m=0.5, corrected coefficient of power a are 0.986, peak torque 800Nm, speed at maximum torque 1400r/min,
Pm=800 × 1400/9549=117.3kW (or by Pm=0.715 × 169=120.8, error 3%), drive shaft weight
51600N。
A, first determine rated power point vehicle velocity V e or maximum torque point vehicle velocity V m, can according to vehicle transmission system gearratio,
The technical parameter calculating method of radius of wheel etc. and obtain, either by measure the standardization of engine speed and speed and or
Obtained by same model series of statistical, also can calculate Ve=Φ × Va by engine stabilizer speed change rate.The present embodiment is by steady
Speed set the tone to calculate, it is 0.88 that diesel vehicle, which takes Φ, measures Va=78.7km/h, Ve=0.88 × 78.7=69.3km/h, θ take
0.65, Vm=θ × Ve=0.65 × 69.3=45.0km/h or Vm=θ × Φ × Va=0.65 × 0.88 × 78.7=
45.0km/h。
B, test statistics radial-ply tyre 50km/h coefficient of frictional resistance f50For 0.009,80km/h coefficient of frictional resistance f80
For 0.012.If η is 65km/h, it is 125N that Ve=69.3km/h takes fe=0.012, Frame resistance Fte more than 65km/h；Vm=
It is 100N that 45.0km/h takes fm=0.009, Frame resistance Ftm less than 65km/h.
C, calculate driving force Fe=3600 × δ e × Pe/ (a × Ve)=3600 × 0.5 × 169/ (0.986 × 69.3)=
4452N, Fm=3600 × δ m × Pm/ (a × Vm)=3600 × 0.5 × 117.3/ (0.986 × 45)=4759N.
D, the frictional resistance and device for power absorption loading force of driving wheel and cylinder surface are calculated：Rated power speed point：
Ffe=51600 × 0.012=619N, Fde=Fe-Fte-Ffe=4452-125-619=3708N；Peak torque speed point：
Ffm=51600 × 0.009=464N, Fdm=Fm-Ftm-Ffm=4759-100-464=4195N.
E, such as detected in rated power speed point, in gas pedal maximum position, the loading of device for power absorption constant force
3708N, for driving force with having reached stabilizing speed Vi=71.6km/h ＞ 69.3km/h after SR balance, dynamic property is qualified,
Dynamic property or waste gas discharge or Fuel Consumption are detected in the Steady state speed, or adjusts and stablizes gas pedal in part position
Put, stabilizing speed Vi is detected under 69.3km/h speeds.
F, such as detected in peak torque speed point, device for power absorption constant force loading 4195N, when driving force and SR
After balance, adjustment accelerator pedal position is more than stabilizing speed and close to 45km/h, dynamic property or useless is detected in the stabilizing speed
Gas discharges or Fuel Consumption.
Wheel drive surfaces output regulation power loading detection method, has detection and accuracy of judgement, operability and security
The advantages that good, improve the uniformity and comparativity for assembling same model engine different automobile types detection.
Claims (1)
1. wheel drive surfaces output regulation power loading detection method, be automobile on chassis dynamometer, wheel drive surfaces output
Provide the corresponding driving force of power and Frame resistance, wheel roller frictional resistance, device for power absorption loading force three's sum
Under SR equilibrium condition, dynamic property or the method for waste gas discharge or Fuel Consumption, its feature are detected by Steady state speed
It is：Vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m is first determined, then wheel drive surfaces under standard ambient condition are defeated
Go out regulation power δ e × Pe or δ m × Pm and be converted into detection ambient condition respective drive power Fe or Fm, Fe=3600 × δ e × Pe/
(a × Ve), or the rated power that Fm=3600 × δ m × Pm/ (a × Vm), Pe are engine, Pm is maximum engine torque
Point power, δ e and δ m are respectively the regulation power coefficient of rated power point and maximum torque point, and a is power correction factor；By institute
The bias tire or radial-ply tyre different kinds of tyre type for examining vehicle determine the wheel roller coefficient of frictional resistance fi of Ve or Vm speeds point,
Drive shaft weight G, unit N, wheel roller frictional resistance F can be obtained by weighingfi=G × fi, unit N, Frame resistance Fti are deposit meters
The known quantity of calculation machine, rated power point device for power absorption loading force Fde=Fe-Fte-Ffe, or maximum torque point power absorption
Device loading force Fdm=Fm-Ftm-Ffm, Fte and Ffe are respectively the Frame resistance and frictional resistance of rated power speed point,
Ftm and Ffm is respectively the Frame resistance and frictional resistance of peak torque speed point；Gas pedal is stable in maximum throttle position
Or behind part-throttle position, wheel drive surfaces driving force reaches balance with SR and stablized in vehicle velocity V i, can be according to Vi phases
Size of the wheel drive surfaces power output with respect to regulation power is judged to Ve or Vm size.
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| CN110646224B (en) * | 2019-10-10 | 2021-08-03 | 中国人民解放军陆军工程大学 | Method for measuring instantaneous output power of vehicle driving wheel |
| CN110646223B (en) * | 2019-10-10 | 2021-08-03 | 中国人民解放军陆军工程大学 | System for measuring instantaneous output power of vehicle driving wheel |
| CN112379193B (en) * | 2020-10-27 | 2022-02-08 | 山东大学 | Method for testing system precision of simple transient working condition method |
| CN113526015B (en) * | 2021-07-17 | 2023-04-14 | 欧普瑞泰环境科技有限公司 | Control method of air cushion conveyor |
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Effective date of registration: 20221208 Address after: 276000 NO.119 Jinhu Industrial Park, West Jiefang Road, high tech Zone, Linyi City, Shandong Province Patentee after: Luyake Fire Vehicle Manufacturing Co.,Ltd. Address before: 528415, Xiaolan Town, Xiaolan Town, Zhongshan, Guangdong, No. 16 vehicle Siu Lam inspection station Patentee before: Wu Ming |