CN102589875A - Testing method for frictional resistance of front-wheel drive automobile driving system - Google Patents
Testing method for frictional resistance of front-wheel drive automobile driving system Download PDFInfo
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- CN102589875A CN102589875A CN2012100370724A CN201210037072A CN102589875A CN 102589875 A CN102589875 A CN 102589875A CN 2012100370724 A CN2012100370724 A CN 2012100370724A CN 201210037072 A CN201210037072 A CN 201210037072A CN 102589875 A CN102589875 A CN 102589875A
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Abstract
The invention discloses a testing method for the frictional resistance of a front-wheel drive automobile driving system. A test object is a front-wheel drive automobile; test parts are a tire and hub frictional force, dragging torque of a brake and a transmission and driving shaft frictional force; the test method comprises the following test steps of: enabling a test automobile to enter a test site; breaking off an electronic parking brake; setting the pressure of a tyre; adjusting the weight of the test automobile; warming up the brake; carrying out a sliding test; preparing a front-axle drum test; setting a road load; testing the transmission and driving shaft frictional force; carrying out a drum reducing test; recording the pressure of a front-axle heat tyre; preparing a rear-axle drum test; warming up a rear tyre; moving away the test automobile; detaching a driving shaft and testing a brake pedal; mounting the driving shaft for testing; and finally, carrying out safety check. The invention provides the test method for testing the friction of each part in a driving system and the criterion for judging the friction of the driving system; the friction loss condition of various components in the driving system can be clearly and objectively reflected; and the objective reference for conducting the performance optimization of the driving system is provided.
Description
Technical field
The invention belongs to the automotive performance method of testing, be specifically related to the test method of forerunner's automobile legacy system frictional resistance.
Background technology
Along with fuel economy regulation requires more and more stricter; Make every effort to frictional resistance through each parts of test kinematic train; Thereby propose performance optimization and product improvement method, and great majority can only be tested the total friction loss of kinematic train at present, can not refine to the friction testing of each parts of kinematic train.Can not provide the design optimization of product and provide powerful support for.In domestic at present (though similar method of testing is arranged, concrete testing scheme is different, and does not form corporate specification) forerunner's car transmissions friction test method, also there is not the test method of special drivetrain components energy loss test abroad.
Summary of the invention
The test method that forerunner's automobile legacy system frictional resistance is provided of the object of the invention; This method can be decomposed the friction loss of forerunner's car transmissions; Obtain the energy loss of each parts through test; Optimization provides guidance and help to the kinematic train resistance, makes it to satisfy the requirement of vehicle performance.
The present invention is the various operating modes of simulation vehicle operating process in environmental test chamber, and acquired signal, record and analysis obtain test result.
The test method of forerunner's automobile legacy system frictional resistance, its subjects is forerunner's transmission automobile, requires vehicle condition good, each system works is normal; Testing equipment is (1) environmental test chamber, (2) drum dynamometer, (3) number extraction system, (4) rollover platform, (5) sand hill, (6) workshop equipment; Test condition is 20 ~ 30 ℃ of environment temperatures; Test component is tire+wheel hub friction force, and detent drags moment, variator+driving shaft friction force;
Test procedure is following:
The first step, test vehicle gets into test site, in test vehicle (being forerunner's transmission automobile) moving process, avoids touching on the brake suddenly;
Second step, break off the electronics parking brake, if test vehicle has been equipped with the electronics parking brake, the essential electronics parking brake that breaks off before beginning test;
The 3rd step, set tire pressure, tire pressure must be set at following minimum value among both;
A.1.5 times manufacturer's recommended setting value, the maximum safe swelling pressure of b. tire;
In the 4th step, adjustment test vehicle weight increases or reduces sandbag, is the required car weight of test to guarantee to reach;
The 5th step, the preheating detent, the preheating parameter is that 80kph changeed 40 minutes, to guarantee the complete preheating of test vehicle dynamometer brake;
In the 6th step, coasting test carries out the coasting test match on rotary drum, through tabling look-up, find corresponding physical inertia according to vehicle test weight, and this parameter is input in the chassis dynamometer setup parameter, selects physics inertia in 800kg ~ 1700kg and recording setting; And will be input to chassis dynamometer from the coasting test result parameter that actual road test obtains, and and recording setting begins after being provided with to carry out coasting test, and follow-on test 3 times, the error range of test result is in 5%;
In the 7th step, the front axle drum test is prepared, and the front axle of test vehicle is fixed on the drum dynamometer, with belt test vehicle is banded on the drum dynamometer, and cooling fan is placed at the place ahead of car;
The 8th step was provided with road load, to test vehicle a road load was provided at drum dynamometer, from the result that the test of the 6th step obtains, selects, and the speed that fan is controlled the drum dynamometer roller is set; In test vehicle exhaust place air extractor is installed, starting engine and stablized tyre temperature at least in 30 minutes with the speed of 80kph;
The 9th step, variator+driving shaft friction testing, after tyre temperature was stable, the engine was kept in motion and hang neutral, carries out variator+driving shaft friction testing;
The tenth step, the rotary drum retarding test, the front axle with test vehicle is fixed on the drum dynamometer once more, carries out decelerating to from 125kph the rotary drum retarding test of 5kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 11 step, the pressure of the hot tire of record front axle, horse back is noted the pressure of the hot tire of front axle after the tenth step;
In the 12 step, the rear axle drum test is prepared, and with belt the rear axle of test vehicle is tied up to be fixed on the drum dynamometer;
In the 13 step, the preheating rear tyre with the speed drive rear axle preheating in 30 minutes of 80kph, keeps rear axle behind the rear tyre temperature stabilization on drum dynamometer, repeats the experiment in the 9th step, the tenth step and the 11 step immediately;
The 14 step, remove test vehicle, the rear axle of test vehicle is removed from drum dynamometer;
In the 15 step, transmission shaft and the brake pedal test of dismantling moves on to the workshop with test vehicle from drum dynamometer; Dismantle transmission shaft and brake pedal; Afterwards, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 16 step, load onto the transmission shaft test, test vehicle is moved on to the workshop from drum dynamometer, load onto transmission shaft, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
In the 17 step, last safety inspection moves on to the workshop with test vehicle from drum dynamometer, loads onto brake pedal and does final safety inspection.
Further, also comprise data analysis and the quality check step, qualitative data is checked out through using contrast kinematic train friction force to handle form in test; Test data can be confirmed through following approach;
(1) with the friction testing result with other the test result contrast of using that same procedure tests out;
(2) use " Michelin's coefficient " that frictional force data is become the data of level road situation, these data will follow the deceleration data through using the track method of testing to draw to compare after a while;
At last, arrangement test report.
The test method of described forerunner's automobile legacy system frictional resistance, before the experiment, break-in 3000km at least before the test vehicle; The tire tread pattern degree of depth is the 50-90% of new tyre at least.
The present invention has following beneficial effect:
(1) test method of each parts friction testing of a kind of kinematic train and the standard of judge kinematic train friction are provided;
(2) can know each the parts friction loss situation of kinematic train that objectively responds out;
(3) to instructing transmission system performance optimization that objective foundation is provided.
Embodiment
The test method of forerunner's automobile legacy system frictional resistance of the present invention, its subjects is forerunner's transmission automobile, requires vehicle condition good, each system works is normal; Testing equipment is (1) environmental test chamber, (2) drum dynamometer, (3) number extraction system, (4) rollover platform, (5) sand hill, (6) workshop equipment; Test condition is 20 ~ 30 ℃ of environment temperatures; Test component is tire+wheel hub friction force, and detent drags moment, variator+driving shaft friction force (variator extension neutral);
Experimental procedure is following:
The first step, test vehicle gets into test site, in test vehicle (being forerunner's transmission automobile) moving process, avoids touching on the brake suddenly; If in the process of test site, the ratio that the driver opens is very fast at the nigration vehicle, touching on the brake suddenly in the way makes brake pedal stressed heavier, and this will cause uncommon high sticking of brakes power test result.
Second step, break off the electronics parking brake, if test vehicle has been equipped with the electronics parking brake, the essential electronics parking brake that breaks off before beginning test; In case being employed once in a while because of carelessness in process of the test, this will cause uncommon high sticking of brakes power.
The 3rd step, set tire pressure, tire pressure must be set at following minimum value among both;
A.1.5 times manufacturer's recommended setting value, the maximum safe swelling pressure of b. tire;
In the 4th step, adjustment test vehicle weight increases or reduces sandbag, is the required car weight of test to guarantee to reach; Sandbag must be evenly distributed, and the assurance center of gravity is followed between the car load center of gravity in the front-row seats center of gravity; When the plus-minus sandbag, the driver must be sitting in steering position; Driver's body weight must be noted;
The 5th step, the preheating detent, the preheating parameter is that 80kph changeed 40 minutes, to guarantee the complete preheating of test vehicle dynamometer brake;
In the 6th step, coasting test carries out the coasting test match on rotary drum, through tabling look-up, find corresponding physical inertia according to vehicle test weight, and this parameter is input in the chassis dynamometer setup parameter, selects physics inertia in 800kg ~ 1700kg and recording setting; And will be input to chassis dynamometer from the coasting test result parameter that actual road test obtains, and and recording setting begins after being provided with to carry out coasting test, and follow-on test 3 times, the error range of test result is in 5%;
In the 7th step, the front axle drum test is prepared, and the front axle of test vehicle is fixed on the drum dynamometer, with belt test vehicle is banded on the drum dynamometer, and cooling fan is placed at the place ahead of car;
The 8th step was provided with road load, to test vehicle a road load was provided at drum dynamometer, from the result that the test of the 6th step obtains, selects, and the speed that fan is controlled the drum dynamometer roller is set; In test vehicle exhaust place air extractor is installed, starting engine and stablized tyre temperature at least in 30 minutes with the speed of 80kph;
The 9th step, variator+driving shaft friction testing, after tyre temperature was stable, the engine was kept in motion and hang neutral, carries out variator+driving shaft friction testing; The driver can get off and still must add with heavy sandbags such as drivers this time;
The tenth step, the rotary drum retarding test, the front axle with test vehicle is fixed on the drum dynamometer once more, carries out decelerating to from 125kph the rotary drum retarding test of 5kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 11 step, the pressure of the hot tire of record front axle, horse back is noted the pressure of the hot tire of front axle after the tenth step;
In the 12 step, the rear axle drum test is prepared, and with belt the rear axle of test vehicle is tied up to be fixed on the drum dynamometer;
In the 13 step, the preheating rear tyre with the speed drive rear axle preheating in 30 minutes of 80kph, keeps rear axle behind the rear tyre temperature stabilization on drum dynamometer, repeats the experiment in the 9th step, the tenth step and the 11 step immediately;
The 14 step, remove test vehicle, the rear axle of test vehicle is removed from drum dynamometer;
In the 15 step, transmission shaft and the brake pedal test of dismantling moves on to the workshop with test vehicle from drum dynamometer; Dismantle transmission shaft and brake pedal; Afterwards, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 16 step, load onto the transmission shaft test, test vehicle is moved on to the workshop from drum dynamometer, load onto transmission shaft, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
In the 17 step, last safety inspection moves on to the workshop with test vehicle from drum dynamometer, loads onto brake pedal and does final safety inspection.
The test method of described forerunner's automobile legacy system frictional resistance also comprises data analysis and the quality check step, and qualitative data is checked out through using contrast kinematic train friction force to handle form in test; Test data can be confirmed through following approach;
(1) with the friction testing result with other the test result contrast of using that same procedure tests out;
(2) use " Michelin's coefficient " that frictional force data is become the data of level road situation, these data will follow the deceleration data through using the track method of testing to draw to compare after a while; Handle form through contrast kinematic train friction force and check more how detailed data.
At last, arrangement test report.
The test method of described forerunner's automobile legacy system frictional resistance is characterized in that: before the experiment, and break-in 3000km at least before the test vehicle; The tire tread pattern degree of depth is the 50-90% of new tyre at least; If not, then need re-type.
Claims (3)
1. the test method of forerunner's automobile legacy system frictional resistance, its subjects is forerunner's transmission automobile, requires vehicle condition good, each system works is normal; Testing equipment is (1) environmental test chamber, (2) drum dynamometer, (3) number extraction system, (4) rollover platform, (5) sand hill, (6) workshop equipment; Test condition is 20 ~ 30 ℃ of environment temperatures; Test component is tire+wheel hub friction force, and detent drags moment, variator+driving shaft friction force;
Test procedure is following:
The first step, test vehicle gets into test site, in test vehicle (being forerunner's transmission automobile) moving process, avoids touching on the brake suddenly;
Second step, break off the electronics parking brake, if test vehicle has been equipped with the electronics parking brake, the essential electronics parking brake that breaks off before beginning test;
The 3rd step, set tire pressure, tire pressure must be set at following minimum value among both;
A.1.5 times manufacturer's recommended setting value, the maximum safe swelling pressure of b. tire;
In the 4th step, adjustment test vehicle weight increases or reduces sandbag, is the required car weight of test to guarantee to reach;
The 5th step, the preheating detent, the preheating parameter is that 80kph changeed 40 minutes, to guarantee the complete preheating of test vehicle dynamometer brake;
In the 6th step, coasting test carries out the coasting test match on rotary drum, through tabling look-up, find corresponding physical inertia according to vehicle test weight, and this parameter is input in the chassis dynamometer setup parameter, selects physics inertia in 800kg ~ 1700kg and recording setting; And will be input to chassis dynamometer from the coasting test result parameter that actual road test obtains, and and recording setting begins after being provided with to carry out coasting test, and follow-on test 3 times, the error range of test result is in 5%;
In the 7th step, the front axle drum test is prepared, and the front axle of test vehicle is fixed on the drum dynamometer, with belt test vehicle is banded on the drum dynamometer, and cooling fan is placed at the place ahead of car;
The 8th step was provided with road load, to test vehicle a road load was provided at drum dynamometer, from the result that the test of the 6th step obtains, selects, and the speed that fan is controlled the drum dynamometer roller is set; In test vehicle exhaust place air extractor is installed, starting engine and stablized tyre temperature at least in 30 minutes with the speed of 80kph;
The 9th step, variator+driving shaft friction testing, after tyre temperature was stable, the engine was kept in motion and hang neutral, carries out variator+driving shaft friction testing;
The tenth step, the rotary drum retarding test, the front axle with test vehicle is fixed on the drum dynamometer once more, carries out decelerating to from 125kph the rotary drum retarding test of 5kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 11 step, the pressure of the hot tire of record front axle, horse back is noted the pressure of the hot tire of front axle after the tenth step;
In the 12 step, the rear axle drum test is prepared, and with belt the rear axle of test vehicle is tied up to be fixed on the drum dynamometer;
In the 13 step, the preheating rear tyre with the speed drive rear axle preheating in 30 minutes of 80kph, keeps rear axle behind the rear tyre temperature stabilization on drum dynamometer, repeats the experiment in the 9th step, the tenth step and the 11 step immediately;
The 14 step, remove test vehicle, the rear axle of test vehicle is removed from drum dynamometer;
In the 15 step, transmission shaft and the brake pedal test of dismantling moves on to the workshop with test vehicle from drum dynamometer; Dismantle transmission shaft and brake pedal; Afterwards, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
The 16 step, load onto the transmission shaft test, test vehicle is moved on to the workshop from drum dynamometer, load onto transmission shaft, test vehicle is moved on on the drum dynamometer fix again, carry out decelerating to the rotary drum retarding test of 5kph from 125kph; Repeated test up to continuous 3 times survey resultant error in 5%;
In the 17 step, last safety inspection moves on to the workshop with test vehicle from drum dynamometer, loads onto brake pedal and does final safety inspection.
2. the test method of forerunner's automobile legacy system frictional resistance according to claim 1 also comprises data analysis and the quality check step, and qualitative data is checked out through using contrast kinematic train friction force to handle form in test; Test data can be confirmed through following approach;
(1) with the friction testing result with other the test result contrast of using that same procedure tests out;
(2) use " Michelin's coefficient " that frictional force data is become the data of level road situation, these data will follow the deceleration data through using the track method of testing to draw to compare after a while;
At last, arrangement test report.
3. the test method of forerunner's automobile legacy system frictional resistance according to claim 1 and 2 is characterized in that: before the experiment, and break-in 3000km at least before the test vehicle; The tire tread pattern degree of depth is the 50-90% of new tyre at least.
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Cited By (6)
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| CN103728133A (en) * | 2014-01-24 | 2014-04-16 | 武汉理工大学 | Method for testing automotive transmission system resistance distribution |
| CN104880322A (en) * | 2015-05-26 | 2015-09-02 | 奇瑞汽车股份有限公司 | Test method applied to vehicle driving machinery resistance |
| CN106768231A (en) * | 2016-12-06 | 2017-05-31 | 北京万集科技股份有限公司 | Vehicle drive shaft and nonpowered axle compartment system and method |
| CN106846821A (en) * | 2017-02-24 | 2017-06-13 | 成都皆为科技有限公司 | A kind of full model recognition system |
| CN108593176A (en) * | 2018-05-22 | 2018-09-28 | 重庆长安汽车股份有限公司 | Measure the method that wheel drags torque |
| CN115144195A (en) * | 2022-06-07 | 2022-10-04 | 哈尔滨东安汽车动力股份有限公司 | Test method for testing vehicle simulation running resistance by rotary drum test bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103728133A (en) * | 2014-01-24 | 2014-04-16 | 武汉理工大学 | Method for testing automotive transmission system resistance distribution |
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| CN106768231A (en) * | 2016-12-06 | 2017-05-31 | 北京万集科技股份有限公司 | Vehicle drive shaft and nonpowered axle compartment system and method |
| CN106768231B (en) * | 2016-12-06 | 2019-06-18 | 北京万集科技股份有限公司 | Vehicle drive shaft and nonpowered axle compartment system and method |
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| CN106846821B (en) * | 2017-02-24 | 2023-09-01 | 成都皆为科技有限公司 | Full-vehicle type recognition system |
| CN108593176A (en) * | 2018-05-22 | 2018-09-28 | 重庆长安汽车股份有限公司 | Measure the method that wheel drags torque |
| CN115144195A (en) * | 2022-06-07 | 2022-10-04 | 哈尔滨东安汽车动力股份有限公司 | Test method for testing vehicle simulation running resistance by rotary drum test bed |
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