CN105157991A - Driving wheel surface output specified power loading detection method - Google Patents
Driving wheel surface output specified power loading detection method Download PDFInfo
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- CN105157991A CN105157991A CN201510613622.6A CN201510613622A CN105157991A CN 105157991 A CN105157991 A CN 105157991A CN 201510613622 A CN201510613622 A CN 201510613622A CN 105157991 A CN105157991 A CN 105157991A
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Abstract
The invention discloses a driving wheel surface output specified power loading detection method. Under the rated power speed Ve or maximum torque speed Vm of a vehicle on a chassis power tester of the vehicle, the driving wheel surface output specified power deltae*Pe or deltam*Pm in the standard environment state is converted into a corresponding driving force Fe or Fm in a detected environment state, and after the corresponding driving force is balanced with the system resistance of frame resistance, wheel cylinder frictional resistance and loading force of a power absorption device, the power or exhaust emission or fuel consumption is detected under the working condition of stable speed, so that the unity and the comparability of detection of different vehicles assembled with the same engine are improved.
Description
Technical field
Wheel drive surfaces exports regulation power and loads detection method, that automobile is on chassis dynamometer, under wheel drive surfaces exports and specifies that the corresponding driving force of power and Frame resistance, wheel cylinder frictional resistance, device for power absorption load the dynamic balance of resistance, Steady state speed detects the method for dynamic property or toxic emission or Fuel Consumption, belongs to car consumption credit technical field.
Background technology
Prior art " regulation wheel power detection method ", Chinese invention patent, the patent No.: ZL201210110890.2, so-called automotive regulations wheel power does not comprise wheel cylinder friction horsepower, because wheel and the frictional resistance of cylinder are directly proportional to wheel wheel load (or axle weight), wheel load is larger, frictional resistance is larger, frictional resistance is also directly proportional to the speed of a motor vehicle, the speed of a motor vehicle is higher, frictional resistance is larger, assemble the passenger vehicle of same model engine, van, the driving shaft of plate washer lorry weighs and detects the speed of a motor vehicle and differs greatly, identical regulation wheel power detect the unitarity of dynamic property or toxic emission or Fuel Consumption and comparability poor.And the method is only applicable to the detection of rated power speed of a motor vehicle point, be not suitable for the detection of peak torque speed of a motor vehicle point, be only applicable to diesel vehicle yet and detect, be not suitable for gasoline car and detect.For overcoming the deficiencies in the prior art, adopt wheel drive surfaces to export regulation power and load detection method, driving force corresponding to wheel drive surfaces output regulation power is comprised and overcomes wheel cylinder frictional resistance, thus improve unitarity and the comparability of the various Performance Detection of automobile.
Summary of the invention
Automobile is on chassis dynamometer, at vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, wheel drive surfaces under standard ambient condition is exported regulation power δ e × Pe or δ m × Pm and is converted into testing environment state respective drive power Fe or Fm, Pe is the rated power of engine, Pm is maximum engine torque point power, δ e and δ m is respectively the regulation power coefficient of rated power point and maximum torque point, usually 0.75 is less than, make Frame resistance, wheel cylinder frictional resistance, the SR of device for power absorption loading force three sum equals driving force Fe or Fm, after wheel driving force and SR balance, dynamic property or toxic emission or Fuel Consumption is detected at Steady state speed, its concrete steps are as follows:
1, with the different kinds of tyre classification of bias tire or radial-ply tyre and the heavy vehicle of different driving axle, chassis dynamometer to be dismantled wheel drive semiaxis, the anti-trailer wheels of variable frequency drive motors appoints wheel art skating to the power-off of max. speed rear motor, adopt increase and decrease inertia twice coastdown or free and loading twice coastdown or twice loading, twice coastdown any one method, measure the wheel cylinder frictional resistance of each speed of a motor vehicle point, divided by the heavy coefficient of frictional resistance fi that can obtain each speed of a motor vehicle point of driving shaft, statistics can to obtain in the heavy scope of different driving axle bias tire or the resistance coefficient f of radial-ply tyre and the complete quadratic equation of the speed of a motor vehicle.
Normally detect dynamic property or toxic emission or Fuel Consumption at the rated power point of engine remarkable characteristic or maximum torque point, the variation range of two speed of a motor vehicle is little, coefficient of frictional resistance f changes also little, can be reduced to, get the coefficient of frictional resistance f of 50km/h speed of a motor vehicle point when the speed of a motor vehicle is less than or equal to η
50, the coefficient of frictional resistance f of 80km/h speed of a motor vehicle point is got when the speed of a motor vehicle is greater than η
80, usual η gets definite value within the scope of 55km/h ~ 75km/h, and can get 50km/h and 80km/h two speed of a motor vehicle point different driving axle heavy phase with the mean value of tire classification, makes f and driving shaft heavily irrelevant after simplification, only relevant to the tire classification of bias tire or radial-ply tyre.
2, determine rated power point vehicle velocity V e or maximum torque point vehicle velocity V m, can according to vehicle transmission system ratio of gear, the technical parameter computing method of radius of wheel etc. and obtaining, or obtained by the standardization measuring engine speed and the speed of a motor vehicle, or obtained by same model series counting statistics, also can set gear device for power absorption on stand on automobile suspension not load engine speed corresponding to surveyed max. speed Va and approximate engine maximum no load governed speed, Ve=Φ × Va is calculated by engine stabilizer speed change rate, Φ is engine stabilizer speed change rate coefficient, can choose in 0.94 ~ 0.82 scope, value bigger than normal got by diesel engine, value less than normal got by gasoline engine, after determining Ve, can according to GB GB/T1147.1-2007 " internal-combustion engine of middle low power Part I: general technical specifications " the 3.9th section regulation: the coefficient of torque reserve of Vehicular internal combustion engine should be more than or equal to 10%, the ratio of maximum torque point rotating speed and rated engine speed, low-speed truck and Vehicular internal combustion engine all should be less than or equal to 70%.Statistics can obtain Vm=θ × Ve or Vm=θ × Φ × Va, θ and can choose in 0.7 ~ 0.6 scope thus.
3, regulation power δ e × Pe or δ m × Pm is exported by wheel drive surfaces under specification or required standard ambient condition, calculate wheel drive surfaces output drive strength Fe or Fm of Ve or the Vm speed of a motor vehicle under testing environment state, Fe=3600 × δ e × Pe/ (a × Ve), Fm=3600 × δ m × Pm/ (a × Vm), in formula, a is power correction factor.
4, in the known quantity that the Frame resistance Ft of Ve or Vm speed of a motor vehicle point is stored in computing machine, weigh and can obtain driving shaft weight G, unit is newton N, wheel cylinder frictional resistance F
f=G × f, unit N, if the loading force of device for power absorption is Fd, balance when wheel drive surfaces driving force and SR reach and stablize at vehicle velocity V i, equilibrium equation: 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 device for power absorption loading force Fdm=Fm-Ftm-Ffm.
5, detect at rated power, maximum throttle stable conditions vehicle velocity V i is not equal to Ve usually, in Fe mono-timing, when Vi be more than or equal to Ve then wheel drive surfaces output power be more than or equal to regulation power δ e × Pe, when Vi be less than Ve then wheel drive surfaces output power be less than regulation power δ e × Pe, the dynamic property in rated power point wheel drive surfaces output power can be judged thus.
6, detect in peak torque, when wheel drive surfaces output power is greater than regulation power δ m × Pm, can under part-throttle operating mode, Vi be greater than and close to Vm, when wheel drive surfaces output power is less than regulation power, under maximum throttle operating mode Vi be less than Vm even engine may stop working, the dynamic property in maximum torque point wheel drive surfaces output power can be judged thus.
Wheel drive surfaces exports regulation power and loads detection method, that automobile is on chassis dynamometer, wheel drive surfaces exports the regulation corresponding driving force of power and Frame resistance, wheel cylinder frictional resistance, under the SR balance of device for power absorption loading force three sum, Steady state speed detects the method for dynamic property or toxic emission or Fuel Consumption, it is characterized in that: at vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, wheel drive surfaces under standard ambient condition is exported regulation power δ e × Pe or δ m × Pm and is converted into testing environment state respective drive power Fe or Fm, Fe=3600 × δ e × Pe/ (a × Ve), or Fm=3600 × δ m × Pm/ (a × Vm), Pe is the rated power of engine, Pm is maximum engine torque point power, δ e and δ m is respectively the regulation power coefficient of rated power point and maximum torque point, a is power correction factor, determine the wheel cylinder coefficient of frictional resistance fi of Ve or Vm speed of a motor vehicle point by the bias tire of examined vehicle or radial-ply tyre different kinds of tyre type, weigh and can obtain driving shaft weight G, unit N, wheel cylinder frictional resistance F
fi=G × fi, unit N, Frame resistance Fti is the known quantity stored in computing machine, rated power point 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 is respectively Frame resistance and the frictional resistance of rated power speed of a motor vehicle point, Ftm and Ffm is respectively Frame resistance and the frictional resistance of peak torque speed of a motor vehicle point, after gas pedal is stabilized in maximum throttle position or part-throttle position, wheel drive surfaces driving force and SR reach and balance and stablize at vehicle velocity V i, can judge the size of the relative regulation power of wheel drive surfaces output power according to Vi relative to the size of Ve or Vm.There is following technical characterstic:
(1) in the detection of vehicle dynamic quality or toxic emission or Fuel Consumption, if specification or require wheel drive surfaces output power with the ratio of rating of engine or be not less than certain limit value with the ratio of maximum engine torque power, then can using limit value as regulation power coefficient δ e or δ m.
(2) in the detection of automobile emission or Fuel Consumption, usually will ensure that the dynamic property of vehicle is qualified, when can balance according to maximum throttle pedal position driving force and SR, Steady state speed Vi judges that whether dynamic property is qualified.
(3) detect at maximum torque point, when wheel drive surfaces output power is greater than regulation power δ m × Pm, detect at gas pedal portion and Vi can be made to be more than or equal to Vm, be conducive to improving detect security.
(4) in the various Performance Detection of automobile, the technology status of concentrated expression engine, engine accessory power rating, power train each parts, when after these component technology situation degradations, wheel drive surfaces output power possibility is defective or toxic emission is defective or Fuel Consumption is defective.
(5) in-use automotive is when peak torque speed of a motor vehicle point detects, if known engine rated power but unknown peak torque and corresponding rotating speed time, can equal 10% by the coefficient of torque reserve of Vehicular internal combustion engine, maximum torque point rotating speed and the ratio of rated engine speed are 0.65 carry out estimating engine maximum torque point power P m=1.10 × 0.65 × Pe=0.715Pe more accurately.
Embodiment
Illustrate that wheel drive surfaces exports the embodiment that regulation power loads detection method for diesel vehicle, diesel vehicle parameter: rating of engine is 169kW, radial-ply tyre, suppose rated power point and maximum torque point regulation power coefficient δ e=δ m=0.5, corrected coefficient of power a is 0.986, peak torque is 800Nm, speed at maximum torque 1400r/min, Pm=800 × 1400/9549=117.3kW (or press Pm=0.715 × 169=120.8, error 3%), the heavy 51600N of driving shaft.
A, first determine rated power point vehicle velocity V e or maximum torque point vehicle velocity V m, can obtain according to the technical parameter computing method of vehicle transmission system ratio of gear, radius of wheel etc., or obtained by the standardization measuring engine speed and the speed of a motor vehicle, or obtained by same model series of statistical, also can calculate Ve=Φ × Va by engine stabilizer speed change rate.The present embodiment calculates by steady state speed governing rate, Φ got by diesel vehicle is 0.88, measures Va=78.7km/h, Ve=0.88 × 78.7=69.3km/h, θ gets 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.
The coefficient of frictional resistance f of b, test statistics radial-ply tyre 50km/h
50be the coefficient of frictional resistance f of 0.009,80km/h
80be 0.012.Be greater than 65km/h get fe=0.012 if η is 65km/h, Ve=69.3km/h, Frame resistance Fte is 125N; Vm=45.0km/h is less than 65km/h and gets fm=0.009, and Frame resistance Ftm is 100N.
C, calculating 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 calculating driving wheel and cylinder surface and device for power absorption loading force: rated power speed of a motor vehicle point: Ffe=51600 × 0.012=619N, Fde=Fe-Fte-Ffe=4452-125-619=3708N; Peak torque speed of a motor vehicle point: Ffm=51600 × 0.009=464N, Fdm=Fm-Ftm-Ffm=4759-100-464=4195N.
E, as detected at rated power speed of a motor vehicle point, at gas pedal maximum position, device for power absorption constant force loads 3708N, stabilizing speed Vi=71.6km/h > 69.3km/h is reached after driving force and SR balance, dynamic property is qualified, detect dynamic property or toxic emission or Fuel Consumption at this Steady state speed, or adjust and stablize gas pedal at portion, stabilizing speed Vi is detected under the 69.3km/h speed of a motor vehicle.
F, as detected at peak torque speed of a motor vehicle point, device for power absorption constant force loads 4195N, after driving force and SR balance, adjustment accelerator pedal position makes stabilizing speed be greater than and close to 45km/h, detects dynamic property or toxic emission or Fuel Consumption at this stabilizing speed.
Wheel drive surfaces exports regulation power and loads detection method, has the advantages such as detect and accuracy of judgement, operability and security be good, improves the unitarity and comparability of assembling the detection of same model engine different automobile types.
Claims (1)
1. wheel drive surfaces exports regulation power and loads detection method, that automobile is on chassis dynamometer, wheel drive surfaces exports the regulation corresponding driving force of power and Frame resistance, wheel cylinder frictional resistance, under the SR balance of device for power absorption loading force three sum, Steady state speed detects the method for dynamic property or toxic emission or Fuel Consumption, it is characterized in that: at vehicle rated power vehicle velocity V e or peak torque vehicle velocity V m, wheel drive surfaces under standard ambient condition is exported regulation power δ e × Pe or δ m × Pm and is converted into testing environment state respective drive power Fe or Fm, Fe=3600 × δ e × Pe/ (a × Ve), or Fm=3600 × δ m × Pm/ (a × Vm), Pe is the rated power of engine, Pm is maximum engine torque point power, δ e and δ m is respectively the regulation power coefficient of rated power point and maximum torque point, a is power correction factor, determine the wheel cylinder coefficient of frictional resistance fi of Ve or Vm speed of a motor vehicle point by the bias tire of examined vehicle or radial-ply tyre different kinds of tyre type, weigh and can obtain driving shaft weight G, unit N, wheel cylinder frictional resistance F
fi=G × fi, unit N, Frame resistance Fti is the known quantity stored in computing machine, rated power point 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 is respectively Frame resistance and the frictional resistance of rated power speed of a motor vehicle point, Ftm and Ffm is respectively Frame resistance and the frictional resistance of peak torque speed of a motor vehicle point, after gas pedal is stabilized in maximum throttle position or part-throttle position, wheel drive surfaces driving force and SR reach and balance and stablize at vehicle velocity V i, can judge the size of the relative regulation power of wheel drive surfaces output power according to Vi relative to the size of Ve or Vm.
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| CN112379193A (en) * | 2020-10-27 | 2021-02-19 | 山东大学 | Method for testing system precision of simple transient working condition method |
| CN113526015A (en) * | 2021-07-17 | 2021-10-22 | 欧普瑞泰环境科技有限公司 | Control method of air cushion conveyor |
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| CN113526015A (en) * | 2021-07-17 | 2021-10-22 | 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 |
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