CN110553773A - manual mechanical transmission efficiency testing method based on NEDC working condition - Google Patents
manual mechanical transmission efficiency testing method based on NEDC working condition Download PDFInfo
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/26—Devices for measuring efficiency, i.e. the ratio of power output to power input
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
the invention provides a manual mechanical transmission efficiency testing method based on an NEDC working condition, which comprises the following steps of: s1, during the fuel consumption test of the NEDC, actually measuring, recording or accurately deducing the rotating speed, the torque and the oil temperature data of the transmission at the input end of the transmission assembly, wherein the data sampling frequency is required to be not more than 10Hz, and the sampling frequencies of the three parameters are consistent; and S2, carrying out two-dimensional frequency statistics on the rotating speed and the torque of the input end of the transmission assembly, and calculating the total time occupying ratio a of the speed and the torque. The invention has the beneficial effects that: 1) the test data points are reduced, the test time is shortened, and the test cost is reduced. 2) The acceptability or consistency of the efficiency of the transmission assembly can be evaluated simply and reliably. 3) The influence of the efficiency of the transmission assembly on the oil consumption of the whole vehicle can be well predicted, and the influence is accurately matched with the actually measured oil consumption.
Description
Technical Field
The invention relates to a testing method, in particular to a manual mechanical transmission efficiency testing method based on an NEDC working condition.
background
The manual mechanical transmission assembly is used as an important part for power transmission of the whole vehicle, and the transmission efficiency of the manual mechanical transmission assembly has a crucial influence on the fuel consumption of the whole vehicle. The existing efficiency testing method for the manual mechanical transmission assembly is developed according to an efficiency Map testing method in industry standard QC/T568.1-2011. The efficiency Map testing method comprises the following steps of totally 200 or 240 testing working condition points, and is composed of a matrix of four variables of engine output end testing torque, engine input end testing rotating speed, transmission oil temperature and transmission gear: the engine torque at the input end is 50 percent and 100 percent of the maximum transmission torque, and the total number is 2 points; 5 rotating speeds of 5 types are uniformly selected within the range from the rotating speed of the input end of the engine to the highest rotating speed of the engine, wherein the rotating speed is 1000 r/min; the temperature of the lubricating oil of the speed changer is 4 points in total at 40 +/-5 ℃, 60 +/-5 ℃, 80 +/-5 ℃ and 100 +/-5 ℃; the gears are 5/6 gears from the lowest gear to the highest gear. The current enterprise standard BT-SGMWJ 0843 and 2013 test working condition points are consistent with the row standards; and the comprehensive transmission efficiency of the transmission is expressed by the comprehensive transmission efficiency of 3-gear, 4-gear and 5-gear of the test sample under the conditions of the rotating speed of the maximum torque point of the engine and the maximum torque when the oil temperature is 80 ℃.
there are problems as follows:
1. The whole vehicle NEDC oil consumption test working condition is a low-load low-rotation-speed working condition starting at normal temperature, so that the evaluation working condition points cannot reflect the running state of the transmission assembly under the real NEDC working condition, so that the difference of the comprehensive efficiency of the transmission cannot accurately reflect the difference of the whole vehicle oil consumption, and the effect of applying the new technology to improve the efficiency of the transmission assembly on the whole vehicle oil saving cannot be accurately evaluated.
2. the gearbox efficiency is tested according to the row standard QC/T568 standard, gearboxes of different manufacturers meet the comprehensive efficiency target requirement, and the comprehensive efficiency is not obviously different. However, the average retardation of each gear of the gearbox is greatly different, especially in the high gear, the oil consumption of the actual vehicle is greatly different through verification, so that the consistency of the transmission cannot be evaluated according to the method.
3. The test operating points are too many, and the difficulty of spot check on the efficiency qualification or consistency of the transmission assembly is increased to a certain extent.
Disclosure of Invention
in order to solve the problems in the prior art, the invention provides a manual mechanical transmission efficiency testing method based on an NEDC working condition.
the invention provides a manual mechanical transmission efficiency testing method based on an NEDC working condition, which comprises the following steps of:
S1, during the fuel consumption test of the NEDC, actually measuring, recording or accurately deducing the rotating speed, the torque and the oil temperature data of the transmission at the input end of the transmission assembly, wherein the data sampling frequency is required to be not more than 10Hz, and the sampling frequencies of the three parameters are consistent;
S2, carrying out two-dimensional frequency statistics on the rotating speed and the torque of the input end of the transmission assembly, and calculating the time total time ratio a of the two-dimensional frequency statistics;
s3, taking two points with the largest time ratio as working condition points of the transmission, reading corresponding rotating speed and torque as the working condition points of the transmission efficiency test, and only taking the average value of the oil temperature of the transmission;
S4, only 2 efficiency test operating points of each gear of the transmission are obtained finally, and 10 or 12 test operating points are obtained in total;
S5, dividing the comprehensive efficiency of the transmission into comprehensive efficiency of a UDC working condition transmission and comprehensive efficiency of an EUDC working condition transmission according to the NEDC circulation characteristics; the comprehensive efficiency of the UDC working condition transmission is the average value of the efficiency sum of the 1 st gear, the 2 nd gear and the 3 rd gear; the comprehensive efficiency of the EUDC working condition transmission is the average value of the efficiency sum of 4-gear, 5-gear and 6-gear;
S6, calculating comprehensive efficiency of the UDC and EUDC working condition transmission respectively as follows;
the comprehensive efficiency of the UDC working condition transmission adopts the following calculation formula:
When the transmission is a 6-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
When the transmission is a 5-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
In the formula:
Eta UDC, eta EUDC -UDC and EUDC operating mode transmission comprehensive efficiency,%;
Corresponding efficiencies of the ith operating point of eta i1, eta i2, eta i3, eta i4, eta i5, eta i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear,%;
the time proportion of the ith operating point of a i1, a i2, a i3, a i4, a i5, a i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear is high;
n is the number of working condition points of each gear;
S7, taking comprehensive efficiency of the UDC and EUDC working condition transmission as an index for evaluating the transmission qualification or consistency;
and S8, replacing the transmission efficiency in the vehicle NEDC oil consumption simulation with the comprehensive efficiency of the UDC and EUDC working condition transmission.
as a further improvement of the present invention, in step S3, the average value of the transmission oil temperature is 40 ℃.
as a further improvement of the present invention, in step S4, the resulting efficiency test operating points for each gear of the transmission are only 2, for a total of 10 or 12 test operating points, which account for approximately 70% of the total time.
the invention has the beneficial effects that:
1) The test data points are reduced, the test time is shortened, and the test cost is reduced.
2) The acceptability or consistency of the efficiency of the transmission assembly can be evaluated simply and reliably.
3) the influence of the transmission assembly efficiency on the oil consumption of the whole vehicle can be well predicted, and
and the measured oil consumption is precisely matched.
drawings
FIG. 1 is a diagram of the speed of the input end of the transmission under the NEDC condition of the method for testing the efficiency of the manual mechanical transmission based on the NEDC condition.
FIG. 2 is a transmission input torque diagram under the NEDC condition of the method for testing the efficiency of a manual mechanical transmission based on the NEDC condition of the present invention
FIG. 3 is a temperature rise curve diagram of transmission oil temperature of a method for testing efficiency of a manual mechanical transmission based on an NEDC working condition.
FIG. 4 is an application example diagram comparing the efficiency simulation model obtained by the testing of the method for testing the efficiency of the manual mechanical transmission based on the NEDC working condition with the test result of the oil consumption of the whole vehicle.
Detailed Description
the invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 3, a method for testing efficiency of a manual mechanical transmission based on NEDC operating condition includes the following steps:
1) when the fuel consumption of an NEDC (New European Driving Cycle) is tested, actually measuring, recording or accurately deducing the rotating speed, the torque and the oil temperature data of the transmission at the input end of a transmission assembly, wherein the sampling frequency of the data is required to be not more than 10Hz, and the sampling frequencies of three parameters are consistent;
2) Carrying out two-dimensional frequency statistics on the rotating speed and the torque of the input end, and calculating the total time ratio a of the two-dimensional frequency statistics;
3) Taking two points with the largest time ratio as working condition points of the transmission, reading corresponding rotating speed and torque as the working condition points of the transmission efficiency test, and only taking the average value of the temperature of the transmission oil, namely 40 ℃;
4) The finally obtained efficiency test working condition points of each gear of the transmission are only 2, and 10 or 12 test working condition points account for about 70% of the total time;
5) Dividing the comprehensive efficiency of the transmission into comprehensive efficiency of a UDC (urban driving condition) working condition transmission and comprehensive efficiency of an EUDC (extra urban driving condition) working condition transmission according to the NEDC circulation characteristics; the comprehensive efficiency of the UDC working condition transmission is the average value of the efficiency sum of the 1 st gear, the 2 nd gear and the 3 rd gear; the comprehensive efficiency of the EUDC working condition transmission is the average value of the efficiency sum of 4-gear, 5-gear and 6-gear;
6) comprehensive efficiency calculations of the UDC and EUDC working condition transmissions are respectively as follows;
the comprehensive efficiency of the UDC working condition transmission adopts the following calculation formula:
When the transmission is a 6-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
When the transmission is a 5-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
in the formula:
eta UDC, eta EUDC -UDC and EUDC operating mode transmission comprehensive efficiency,%;
corresponding efficiencies of the ith operating point of eta i1, eta i2, eta i3, eta i4, eta i5, eta i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear,%;
the time proportion of the ith operating point of a i1, a i2, a i3, a i4, a i5, a i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear is high;
n is the number of the working condition points of each gear.
7) comprehensive efficiency of the UDC and EUDC working condition transmission is used as an index for evaluating the qualification rate or consistency of the transmission;
8) Comprehensive efficiency of the UDC and EUDC working condition speed changer is used for replacing the speed changer efficiency of the whole vehicle NEDC oil consumption simulation.
According to the manual mechanical transmission efficiency testing method based on the NEDC working condition, the designed transmission efficiency testing working condition is reduced to 10-12 testing points aiming at the NEDC oil consumption working condition, the lubricating oil temperature is selected to be 40 ℃ of average temperature under the NEDC oil consumption working condition, the temperature is controlled well, and the testing cost is saved. FIG. 4 is an application example of comparing a simulation model of efficiency obtained by the test of the invention with a test result of the oil consumption of an actual vehicle of the whole vehicle, well predicting the influence of the efficiency of a transmission assembly on the oil consumption of the whole vehicle, and accurately matching with the actual oil consumption, if the oil consumption difference of FIG. 4 is 0.01-0.03L/100km, the difference is within the deviation range of the actual measurement result. The efficiency consistency of the transmission assembly can be quickly and effectively evaluated by adopting the efficiency testing working condition points selected by the invention so as to select better suppliers and urge the suppliers to carry out quality improvement.
the invention provides a method for testing efficiency of a manual mechanical transmission based on an NEDC working condition, which mainly has the following effects:
1. two points with the largest time ratio are taken as efficiency test points of the transmission assembly by a two-dimensional frequency statistical method, so that test data points are effectively reduced, the test time is shortened, and the test cost is reduced.
2. Transmission assembly efficiency is simply and reliably evaluated for compliance or consistency.
3. The influence of the efficiency of the transmission assembly on the oil consumption of the whole vehicle is well predicted and is accurately matched with the actually measured oil consumption.
4. the concept of decomposing the transmission efficiency into comprehensive efficiency of the UDC and EUDC working condition transmissions is provided according to the characteristics of the NEDC circulation working condition, namely the comprehensive efficiency of the UDC working condition transmission is the average value of the efficiency sum of the 1 st gear, the 2 nd gear and the 3 rd gear; the comprehensive efficiency of the EUDC working condition transmission is the average value of the sum of the efficiencies of 4 gear, 5 gear and 6 gear.
5. and a simple and reliable index is provided for the spot check of the consistency of the transmission assembly.
6. On the basis of not increasing the simulation difficulty, the influence of the transmission assembly efficiency on the oil consumption of the whole vehicle is more accurately predicted.
the foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. a manual mechanical transmission efficiency testing method based on an NEDC working condition is characterized by comprising the following steps:
S1, during the fuel consumption test of the NEDC, actually measuring, recording or accurately deducing the rotating speed, the torque and the oil temperature data of the transmission at the input end of the transmission assembly, wherein the data sampling frequency is required to be not more than 10Hz, and the sampling frequencies of the three parameters are consistent;
s2, carrying out two-dimensional frequency statistics on the rotating speed and the torque of the input end of the transmission assembly, and calculating the time total time ratio a of the two-dimensional frequency statistics;
s3, taking two points with the largest time ratio as working condition points of the transmission, reading corresponding rotating speed and torque as the working condition points of the transmission efficiency test, and only taking the average value of the oil temperature of the transmission;
s4, only 2 efficiency test operating points of each gear of the transmission are obtained finally, and 10 or 12 test operating points are obtained in total;
S5, dividing the comprehensive efficiency of the transmission into comprehensive efficiency of a UDC working condition transmission and comprehensive efficiency of an EUDC working condition transmission according to the NEDC circulation characteristics; the comprehensive efficiency of the UDC working condition transmission is the average value of the efficiency sum of the 1 st gear, the 2 nd gear and the 3 rd gear; the comprehensive efficiency of the EUDC working condition transmission is the average value of the efficiency sum of 4-gear, 5-gear and 6-gear;
s6, calculating comprehensive efficiency of the UDC and EUDC working condition transmission respectively as follows;
the comprehensive efficiency of the UDC working condition transmission adopts the following calculation formula:
When the transmission is a 6-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
When the transmission is a 5-gear transmission, the comprehensive efficiency of the EUDC working condition transmission adopts the following calculation formula:
In the formula:
eta UDC, eta EUDC -UDC and EUDC operating mode transmission comprehensive efficiency,%;
Corresponding efficiencies of the ith operating point of eta i1, eta i2, eta i3, eta i4, eta i5, eta i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear,%;
the time proportion of the ith operating point of a i1, a i2, a i3, a i4, a i5, a i6 -1 gear, 2 gear, 3 gear, 4 gear, 5 gear and 6 gear is high;
n is the number of working condition points of each gear;
s7, taking comprehensive efficiency of the UDC and EUDC working condition transmission as an index for evaluating the transmission qualification or consistency;
and S8, replacing the transmission efficiency in the vehicle NEDC oil consumption simulation with the comprehensive efficiency of the UDC and EUDC working condition transmission.
2. the method for testing efficiency of a manual mechanical transmission based on NEDC operating conditions of claim 1, wherein: in step S3, the transmission oil temperature has an average value of 40 ℃.
3. the method for testing efficiency of a manual mechanical transmission based on NEDC operating conditions of claim 1, wherein: in step S4, the resulting efficiency test operating points for each gear of the transmission are only 2, for a total of 10 or 12 test operating points, which account for approximately 70% of the total time.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111413105A (en) * | 2020-03-30 | 2020-07-14 | 江西江铃集团新能源汽车有限公司 | Efficiency test evaluation method for electric vehicle power system |
| CN112033671A (en) * | 2020-09-30 | 2020-12-04 | 重庆青山工业有限责任公司 | Transmission efficiency testing method for pure electric speed reducer assembly |
| CN112197894A (en) * | 2020-10-15 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Method and system for acquiring average efficiency of gearbox based on whole vehicle |
| CN114034483A (en) * | 2021-09-01 | 2022-02-11 | 安徽江淮汽车集团股份有限公司 | Control method and system for torque transmission precision of automatic gearbox clutch |
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| CN112197894A (en) * | 2020-10-15 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Method and system for acquiring average efficiency of gearbox based on whole vehicle |
| CN114034483A (en) * | 2021-09-01 | 2022-02-11 | 安徽江淮汽车集团股份有限公司 | Control method and system for torque transmission precision of automatic gearbox clutch |
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