CN103983460B - A kind of vehicle inner walkway method - Google Patents
A kind of vehicle inner walkway method Download PDFInfo
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Abstract
The invention discloses a kind of vehicle inner walkway method, tested by the Coast-down check under carrying out car load on chassis dynamometer respectively and removing the different operating modes of each parts, obtain each parts system internal resistance value such as car load and brakes, drive system, change speed gear box, main reducing gear of various operating mode corresponding states.The advantage that this method has highly versatile, precision is high, expense is low, the test period is short.
Description
Technical field
The present invention relates to vehicle performance factor method of testing, a kind of method testing vehicle internal resistance.
Background technology
At resistance in vehicle complete vehicle internal resistance i.e. automobile self, being broadly divided into brakes and drive system two large divisions, the size of vehicle internal resistance affects car transmissions performance and transmission efficiency, and vehicle oil consumption is produced impact.Along with motor vehicle emission requirement is stepped up by country, reduction vehicle complete vehicle resistance raising transmission efficiency seems and becomes more and more important.
The technical standard that at present automobile industry is existing is typically under car load road condition, uses automobile slide method to obtain automobile slide distance, using the length of coasting distance as the standard of evaluation vehicle complete vehicle resistance.
Existing a set of road real steering vectors scheme: install flexible board torque sensor on engine output shaft and speed probe measures electromotor output net torque and rotating speed, change speed gear box sensor, power transmission shaft sensor, half axle sensor are installed in drive system to measure moment of torsion and the rotating speed of each node, four wheels of vehicle are installed high-resolution wheel torque sensor to measure tire drag loss, at outside vehicle, windage sensor is installed, obtains air-resistance power loss.The engine output more than recorded and drive wheel power loss, the difference of driven pulley rotational power loss, tire rolling power loss and air drag power loss is exactly the overall power loss of drive system, then calculates the resistance of car load drive system according to formula.
The test of above road test can directly detect car transmissions performance, but road conditions is difficult to control, it is limited by environment (humidity, temperature, wind speed) and the difference of region, result of the test repeatability and comparability are the most poor, and car load road test is tested when installing each measurement parts additional, need to be modified part in vehicle drive system designing to facilitate installation to measure sensor.Car load road test can only be tested for a chassis simultaneously, interchangeability and poor universality, and because car transmissions performance is had nothing in common with each other, therefore measured data do not possess representativeness.
Additionally also has a kind of method utilizing stand that the single part such as drive system and brakes is tested.Such as: when carrying out single part engine bench test for drive system, it is usually using motor as power source, it is respectively mounted rotating speed, torque sensor at power train part input and outfan, to obtain corresponding torque and the parameter of rotating speed, calculate the loss of power train each device power according to test data, drive system each parts resistance can be obtained.This monomer bench test method of testing and process settings are the most flexible, can make corresponding change for the test structural parameters of exemplar, test target etc..But there is certain gap between institute's simulated automotive operating mode and actual operating mode in testing experiment, this gap is affected by the loading system of stand and the precision of control system.And when testing test exemplar on stand, load, vibration suffered by exemplar are all different under car load running status.
Summary of the invention
It is an object of the invention to provide a kind of vehicle inner walkway method, to utilize chassis dynamometer to obtain various vehicle components Resistance Value under vehicle boarded state.
Vehicle inner walkway method of the present invention, including the first step: car load Coast-down check is tested, and it comprises the steps: 1.1) instruction carriage is whole vehicle state, and instruction carriage carries out on chassis dynamometer the pre-heat treatment；
1.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
1.3) by target resistance curve f (v) of this instruction carriage=a+b*v+c*v2In the value of a, b, c be input in the control computer of chassis dynamometer, the value of described a, b, c is tested gained by this instruction carriage beforehand through road coasting test；
1.4) after max. speed and minimum speed are set, chassis dynamometer starts Coast-down check, and records rotary drum output resistance curve f1(v)=a1+b1*v+c1*v2；
1.5) by formula F (v)=f (v)-f1V ()-r determines car load internal drag curve F (v), in formula, r is chassis dynamometer internal resistance；
1.6) utilize above-mentioned car load internal drag curve F (v) interval to choose the some internal resistance values between max. speed to minimum speed, and calculate its meansigma methods as instruction carriage car load Coast-down check internal resistance value F1。
Second step: removing the Coast-down check test of brakes, it comprises the steps:
2.1) brakes having carried out the vehicle of described first step testing experiment is removed and carried out the pre-heat treatment on chassis dynamometer；
2.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
2.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check2(v)=a2+b2*v+c2*v2；
2.4) formula F is passed through ' (v)=f (v)-f2V ()-r determines vehicle internal drag curve F ' (v) after this dismounting brakes；
2.5) vehicle internal drag curve F ' (v) after utilizing above-mentioned dismounting brakes is spaced according to the same way in first step testing experiment and chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F2；
2.6) with the internal resistance value F of described first step testing experiment1With this Coast-down check internal resistance value F2Difference as brakes internal resistance value FBrakes=F1-F2。
3rd step: removing the Coast-down check test of power transmission shaft, it comprises the steps:
3.1) vehicle completing described second step testing experiment is processed: remove the power transmission shaft of its drive axle power intake further, transmit with the power of open slew case and power transmission shaft and get rid of its drag effects；
3.2) will process after this instruction carriage carry out the pre-heat treatment, after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
3.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check3(v)=a3+b3*v+c3*v2；
3.4) formula F is passed through ' ' (v)=f (v)-f3V ()-r determines vehicle internal drag curve F ' ' (v) after this dismounting brakes and power transmission shaft；
3.5) vehicle internal drag curve F ' ' (v) utilizing this Coast-down check is spaced according to the same way in first step testing experiment chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F3；
3.6) with the internal resistance value F of described second step testing experiment2With this Coast-down check internal resistance value F3Difference as variator internal resistance value FVariator=F2-F3。
4th step: removing the Coast-down check test of main reducing gear driving tooth, it comprises the steps:
4.1) vehicle completing described 3rd step testing experiment is processed: remove its main reducing gear driving tooth further, to get rid of main reducing gear drag effects；
4.2) will process after instruction carriage carry out the pre-heat treatment, after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
4.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check4(v)=a4+b4*v+c4*v2；
4.4) formula F is passed through ' ' ' (v)=f (v)-f4V ()-r determines vehicle internal drag curve F ' ' ' (v) after this dismounting brakes, power transmission shaft and main reducing gear driving tooth；
4.5) vehicle internal drag curve F ' ' ' (v) utilizing this Coast-down check is spaced according to the same way in first step testing experiment chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F4；
4.6) with the internal resistance value F of described 3rd step testing experiment3With this Coast-down check internal resistance value F4Difference as main reducing gear internal resistance value FMain reducing gear=F3-F4。
The present invention is tested by the Coast-down check under carrying out car load on chassis dynamometer respectively and removing the different operating modes of each parts, thus record and include sliding speed change and the data such as coasting time, coasting distance, and then each parts system internal resistance value such as car load and brakes, drive system, change speed gear box, main reducing gear of being calculated various operating mode corresponding states according to correlation formula, it is thus achieved that the resistance distribution situation under each component mounting whole vehicle state.This method does not only have the advantages such as highly versatile, repeatability is high, comparative is strong, precision is high, expense is low, the test period is short, and discovery and the solution of enterprise's problem in new car exploitation and later stage optimize can be greatly facilitated, lifting autonomous Design research and development ability and manufacture level are significant.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further elaborated:
Vehicle inner walkway method of the present invention, including the first step: car load Coast-down check is tested, and it comprises the steps:
1.1) instruction carriage is whole vehicle state, instruction carriage carries out on chassis dynamometer the pre-heat treatment, typically runs 45min with 50km/h speed；
1.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
1.3) by target resistance curve f (v) of this instruction carriage=a+b*v+c*v2In the value of a, b, c be input in the control computer of chassis dynamometer, the value of described a, b, c is tested gained by this instruction carriage beforehand through road coasting test；
1.4) it is 120km/h and after minimum speed is 20km/h arranging max. speed, chassis dynamometer starts Coast-down check, and records rotary drum output resistance curve f1(v)=a1+b1*v+c1*v2；
1.5) by formula F (v)=f (v)-f1V ()-r determines car load internal drag curve F (v), in formula, r is chassis dynamometer internal resistance；
1.6) utilize 11 internal resistance values that above-mentioned car load internal drag curve F (v) is chosen with 10km/h between max. speed to minimum speed for interval, and calculate its meansigma methods as instruction carriage car load Coast-down check internal resistance value F1, i.e. F1=F(120) and+F(110)++ F(30)+F(20)/11.
Second step: removing the Coast-down check test of brakes, it comprises the steps:
2.1) brakes having carried out the vehicle of described first step testing experiment is removed and carried out the pre-heat treatment on chassis dynamometer, if instruction carriage is carried out after having carried out first step testing experiment immediately, then use chassis dynamometer motoring ring test car to run 30min with 50km/h, otherwise run 45min with 50km/h；
2.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
2.3) on chassis dynamometer, start Coast-down check according to the same way (arrange max. speed be 120km/h and minimum speed is 20km/h) in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check2(v)=a2+b2*v+c2*v2；
2.4) formula F is passed through ' (v)=f (v)-f2V ()-r determines vehicle internal drag curve F ' (v) after this dismounting brakes；
2.5) vehicle internal drag curve F ' (v) after utilizing above-mentioned dismounting brakes chooses ten one internal resistance values from max. speed to minimum speed with 10km/h for interval according to the same way in first step testing experiment, and calculates its meansigma methods as this Coast-down check internal resistance value F2, i.e. F 2=F ' (120)+F ' (110)++ F ' (30)+F ' (20) }/11
2.6) with the internal resistance value F of described first step testing experiment1With this Coast-down check internal resistance value F2Difference as brakes internal resistance value FBrakes=F1-F2。
3rd step: removing the Coast-down check test of power transmission shaft, it comprises the steps:
3.1) vehicle completing described second step testing experiment is processed: remove the power transmission shaft of its drive axle power intake further, transmit with the power of open slew case and power transmission shaft and get rid of its drag effects；
3.2) this instruction carriage after processing carries out the pre-heat treatment, if instruction carriage is carried out after having carried out second step testing experiment immediately, then uses chassis dynamometer motoring ring test car to run 30min with 50km/h, otherwise runs 45min with 50km/h；After the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
3.3) on chassis dynamometer, start Coast-down check according to the same way (arrange max. speed be 120km/h and minimum speed is 20km/h) in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check3(v)=a3+b3*v+c3*v2；
3.4) formula F is passed through ' ' (v)=f (v)-f3V ()-r determines vehicle internal drag curve F ' ' (v) after this dismounting brakes and power transmission shaft；
3.5) utilize 11 internal resistance values that vehicle internal drag curve F ' ' (v) of this Coast-down check is chosen from max. speed to minimum speed with 10km/h for interval according to the same way in first step testing experiment, and calculate its meansigma methods as this Coast-down check internal resistance value F3, i.e. F 3=F ' ' (120)+F ' ' (110)++ F ' ' (30)+F ' ' (20) }/11
3.6) with the internal resistance value F of described second step testing experiment2With this Coast-down check internal resistance value F3Difference as variator internal resistance value FVariator=F2-F3。
4th step: removing the Coast-down check test of main reducing gear driving tooth, it comprises the steps:
4.1) vehicle completing described 3rd step testing experiment is processed: remove its main reducing gear driving tooth further, to get rid of main reducing gear drag effects；
4.2) instruction carriage after processing carries out the pre-heat treatment, if instruction carriage is carried out after having carried out the 3rd step testing experiment immediately, then uses chassis dynamometer motoring ring test car to run 30min with 50km/h, otherwise runs 45min with 50km/h；After the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
4.3) on chassis dynamometer, start Coast-down check according to the same way (arrange max. speed be 120km/h and minimum speed is 20km/h) in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check4(v)=a4+b4*v+c4*v2；
4.4) formula F is passed through ' ' ' (v)=f (v)-f4V ()-r determines vehicle internal drag curve F ' ' ' (v) after this dismounting brakes, power transmission shaft and main reducing gear driving tooth；
4.5) utilize 11 internal resistance values that vehicle internal drag curve F ' ' ' (v) of this Coast-down check is chosen from max. speed to minimum speed with 10km/h for interval according to the same way in first step testing experiment, and calculate its meansigma methods as this Coast-down check internal resistance value F4, i.e. F 4=F ' ' ' (120)+F ' ' ' (110)++ F ' ' ' (30)+F ' ' ' (20) }/11
4.6) with the internal resistance value F of described 3rd step testing experiment3With this Coast-down check internal resistance value F4Difference as main reducing gear internal resistance value FMain reducing gear=F3-F4。
Claims (1)
1. a vehicle inner walkway method, it is characterised in that comprise the steps:
The first step: car load Coast-down check is tested, and it comprises the steps:
1.1) instruction carriage is whole vehicle state, and instruction carriage carries out on chassis dynamometer the pre-heat treatment；
1.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
1.3) by target resistance curve f (v) of this instruction carriage=a+b*v+c*v2In the value of a, b, c be input in the control computer of chassis dynamometer, the value of described a, b, c is tested gained by this instruction carriage beforehand through road coasting test；
1.4) after max. speed and minimum speed are set, chassis dynamometer starts Coast-down check, and records rotary drum output resistance curve f1(v)=a1+b1*v+c1*v2；
1.5) by formula F (v)=f (v)-f1V ()-r determines car load internal drag curve F (v), in formula, r is chassis dynamometer internal resistance；
1.6) utilize above-mentioned car load internal drag curve F (v) interval to choose the some internal resistance values between max. speed to minimum speed, and calculate its meansigma methods as instruction carriage car load Coast-down check internal resistance value F1；
Second step: removing the Coast-down check test of brakes, it comprises the steps:
2.1) brakes having carried out the vehicle of described first step testing experiment is removed and carried out the pre-heat treatment on chassis dynamometer；
2.2) after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
2.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check2(v)=a2+b2*v+c2*v2；
2.4) formula F is passed through ' (v)=f (v)-f2V ()-r determines vehicle internal drag curve F ' (v) after this dismounting brakes；
2.5) vehicle internal drag curve F ' (v) after utilizing above-mentioned dismounting brakes is spaced according to the same way in first step testing experiment and chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F2；
2.6) with the internal resistance value F of described first step testing experiment1With this Coast-down check internal resistance value F2Difference as brakes internal resistance value FBrakes=F1-F2；
3rd step: removing the Coast-down check test of power transmission shaft, it comprises the steps:
3.1) vehicle completing described second step testing experiment is processed: remove the power transmission shaft of its drive axle power intake further, transmit with the power of open slew case and power transmission shaft and get rid of its drag effects；
3.2) will process after this instruction carriage carry out the pre-heat treatment, after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
3.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check3(v)=a3+b3*v+c3*v2；
3.4) formula F is passed through ' ' (v)=f (v)-f3V ()-r determines vehicle internal drag curve F ' ' (v) after this dismounting brakes and power transmission shaft；
3.5) vehicle internal drag curve F ' ' (v) utilizing this Coast-down check is spaced according to the same way in first step testing experiment chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F3；
3.6) with the internal resistance value F of described second step testing experiment2With this Coast-down check internal resistance value F3Difference as variator internal resistance value FVariator=F2-F3；
4th step: removing the Coast-down check test of main reducing gear driving tooth, it comprises the steps:
4.1) vehicle completing described 3rd step testing experiment is processed: remove its main reducing gear driving tooth further, to get rid of main reducing gear drag effects；
4.2) will process after instruction carriage carry out the pre-heat treatment, after the pre-heat treatment terminates, if instruction carriage is manual vehicle, then by vehicle stall, be set to neutral gear the parking brake that comes loose, if instruction carriage is automatic transmission vehicle, then starts electromotor, be set to N shelves the parking brake that comes loose；
4.3) on chassis dynamometer, start Coast-down check according to the same way in first step testing experiment, and record the rotary drum output resistance curve f of this Coast-down check4(v)=a4+b4*v+c4*v2；
4.4) formula F is passed through ' ' ' (v)=f (v)-f4V ()-r determines vehicle internal drag curve F ' ' ' (v) after this dismounting brakes, power transmission shaft and main reducing gear driving tooth；
4.5) vehicle internal drag curve F ' ' ' (v) utilizing this Coast-down check is spaced according to the same way in first step testing experiment chooses the some internal resistance values from max. speed to minimum speed, and calculates its meansigma methods as this Coast-down check internal resistance value F4；
4.6) with the internal resistance value F of described 3rd step testing experiment3With this Coast-down check internal resistance value F4Difference as main reducing gear internal resistance value FMain reducing gear=F3-F4。
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