CN112051076B - New energy automobile power assembly road spectrum loading test method - Google Patents

New energy automobile power assembly road spectrum loading test method Download PDF

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CN112051076B
CN112051076B CN202010947587.2A CN202010947587A CN112051076B CN 112051076 B CN112051076 B CN 112051076B CN 202010947587 A CN202010947587 A CN 202010947587A CN 112051076 B CN112051076 B CN 112051076B
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load
road spectrum
power assembly
data
working condition
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CN112051076A (en
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谭伟
米林
田铁
杨浩森
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Chongqing University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/02—Gearings; Transmission mechanisms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/02—Gearings; Transmission mechanisms
    • G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention provides a new energy automobile power assembly road spectrum loading test method, which comprises the following steps: acquiring running speed-time history road spectrum data of a vehicle under a single cycle working condition in an actual traffic environment, and determining acceleration-time history data according to the running speed-time history road spectrum data; acquiring load-time history data of the power assembly under a single cycle working condition; dividing the load of the power assembly into a plurality of load intervals, establishing a rotation number calculation model in different load intervals, and determining the rotation number of an output shaft of the power assembly in different load intervals; converting the power load-revolution distribution data of the single circulation working condition into torque-revolution distribution data, and determining the torque-revolution distribution of the single circulation working condition; determining road spectrum loading data according to the torque-revolution distribution data of a single cycle working condition; determining road spectrum loading time according to the working condition cycle times; performing a road spectrum loading test on the vehicle power assembly according to the road spectrum loading data and the road spectrum loading time; the test of the power assembly is combined with the actual road spectrum load, and the accuracy of the test result is greatly improved.

Description

New energy automobile power assembly road spectrum loading test method
Technical Field
The invention relates to a vehicle test method, in particular to a new energy automobile power assembly road spectrum loading test method.
Background
The reliability test of the automobile power transmission part is generally divided into two methods of a loading test and a bench test. The loading test is used for loading a sample vehicle to run on an actual road, and the vehicle dynamic property, the fuel economy, the safety, the smoothness, the trafficability property and the like of the vehicle are tested, so that the test result has the authenticity and the reliability. But the consumed manpower, material resources and financial resources are large, the test period is long, the test data acquisition is difficult, and the like. Meanwhile, the complex and various roads in the field and the driving habits of drivers can cause poor repeatability of test results.
The bench test is to place the tested power assembly components on the corresponding test bench, and the traditional bench test method for the components of the automobile power transmission system generally adopts a dragging-loading test method, such as a test specification QCT568.1-2011 automobile mechanical transmission assembly bench test method (minitype) and a QCT533-1999 automobile drive axle bench test method. The types of the rack comprise a power flow open type, a mechanical closed type, an electrical closed type and the like, and the loading load is tested according to the loading recommended times of the rated torque and the rated rotating speed according to the standard specification. However, the driving road spectrum of the vehicle is complex, and the driving road spectrum data of the vehicle separated according to the test specification causes inaccurate test results. If road spectrum data are directly introduced for loading, the road spectrum data are dispersed, so that the response time requirement of the dynamometer motor cannot be met, partial jump loads cannot be loaded, and the test result is deviated. Meanwhile, the new energy power assembly has a plurality of power sources and a plurality of working modes, and the traditional transmission part test bed function cannot meet the test requirement of the new energy power assembly.
Therefore, road spectrum load data are introduced into the bench test, the bench test and the vehicle running working condition can be closely linked, and the accuracy of the test result is greatly improved. However, the road spectrum load data are scattered, the loading time of the dynamometer motor cannot meet the response requirement, equivalent processing of the road spectrum data is required to meet the loading requirement of the dynamometer motor, and meanwhile, a test device meeting the requirements of a new energy power assembly in various power flow modes needs to be designed to meet the test requirement.
Therefore, in order to solve the above technical problems, a new technical solution is needed.
Disclosure of Invention
In view of the above, the present invention provides a new energy vehicle powertrain road spectrum loading test method to solve the above technical problems.
The invention provides a new energy automobile power assembly road spectrum loading test method, which comprises the following steps:
s1, acquiring running speed-time history road spectrum data of a vehicle under a single cycle working condition of an actual traffic environment, and determining acceleration-time history data according to the running speed-time history road spectrum data;
s2, acquiring load-time history data of the power assembly under a single cycle working condition;
s3, dividing the load of the power assembly into a plurality of load intervals, establishing a power assembly output shaft revolution solving model in different load intervals, and determining the revolutions in different load intervals;
s4, converting the power total load-revolution distribution data of the single circulation working condition into torque-revolution distribution data, and determining the torque-revolution distribution of the single circulation working condition;
s5, determining road spectrum loading data according to the torque-revolution distribution data of the single circulation working condition;
s6, determining road spectrum loading time according to the working condition cycle times;
and S6, carrying out a road spectrum loading test on the vehicle power assembly according to the road spectrum loading data and the road spectrum loading time.
Further, the model of the number of revolutions in the different load intervals is as follows:
Figure BDA0002675852020000021
wherein, N Ti Is a load interval T i The number of revolutions of the output shaft of the lower power assembly, m is a load interval T i Number of time histories of, Δ t i Is a load interval T i Length of time history of v (t) is a speed function of the vehicle, i o Is the transmission ratio of the main reducer, and r is the rolling radius of the wheel.
Further, the road spectrum loading time is determined by the following method:
Figure BDA0002675852020000031
wherein, t Ti Is a load interval T i Test load application time under, N Ti Is a load interval T i Load-applied number of revolutions of (n) e And setting the rotating speed for the output shaft test of the power assembly.
The invention has the beneficial effects that: according to the invention, the test of the power assembly is combined with the actual road spectrum load, so that the accuracy of the test result is greatly improved; the method has the advantages that the dispersed road spectrum load in the running process of the vehicle is subjected to load division and concentrated induction, the load division is processed into a limited load division, and the problem of response time in the road spectrum loading process of the dynamometer motor is solved. The reliability of the power assembly before the new energy automobile is manufactured can be checked by using the method, the power assembly of the new energy automobile can be designed according to the data after test and modification, the whole investment of the design link of the power system of the new energy automobile can be reduced, and the design time of the new energy automobile is shortened.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a view for explaining the number of revolutions in the load section according to the present invention.
Fig. 3 is a schematic structural diagram of a road spectrum loading system according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a new energy automobile power assembly road spectrum loading test method, which comprises the following steps:
s1, acquiring running speed-time history road spectrum data of a vehicle under a single cycle working condition in an actual traffic environment, and determining acceleration-time history data according to the running speed-time history road spectrum data; the acceleration-time history data determination process comprises the following steps:
Figure BDA0002675852020000032
wherein, f a (t) is a function of the acceleration of the vehicle, f v (t) is a function of the speed of the vehicle, t being time; the acceleration function and the speed function are both existing functions;
s2, acquiring load-time history data of the power assembly under a single cycle working condition;
the data model of the power assembly load-time course is as follows:
Figure BDA0002675852020000041
wherein, T tq (t) -powertrain output axle loadLoading; i.e. i o -main reducer transmission ratio; eta t -transmission efficiency; r-wheel rolling radius; m represents the whole vehicle mass; g-gravitational acceleration; f, road resistance coefficient; α — road inclination; c D -a wind resistance coefficient; a-windward area; delta-rotating mass conversion factor; f. of v (t) -a vehicle speed function with time as a variable; f. of a (t) -a vehicle acceleration function; determining the load-time history data of the power assembly through the model;
s3, dividing the load of the power assembly into a plurality of load intervals, and calculating the time history delta t when the load interval is Ti Ti And according to the speed function f of the vehicle v (t) obtaining the number of revolutions of the output shaft of the power assembly when the load interval is Ti, as shown in FIG. 2;
the model of the load interval-revolution of the power assembly is as follows:
load interval of T i The total time history of the time is m time histories, and the total length of the time histories is as follows:
Δt Ti ＝Δt 1 +Δt 2 +…+Δt i +…+Δt m ；
Δt m the number of revolutions of the output shaft of the power assembly in time is as follows:
Figure BDA0002675852020000042
then the time history deltat Ti The number of revolutions of the output shaft of the lower power assembly is as follows:
Figure BDA0002675852020000043
wherein N is Ti Is a load interval T i The number of revolutions of the output shaft of the lower power assembly, m is a load interval T i Number of time histories of, Δ t i Is a load interval T i Length of time history of lower, f v (t) is a speed function of the vehicle, i o The transmission ratio of the main reducer, and r is the rolling radius of the wheel; from this, the load interval-rpm distribution data can be determined for a single cycle.
S4, converting the power assembly load interval-revolution distribution data under the single circulation working condition into power assembly output shaft torque-revolution distribution data, and determining output shaft torque-revolution distribution under the single circulation working condition;
s5, determining road spectrum loading data according to the torque-revolution distribution data under the single circulation working condition; the road spectrum loading data determining process comprises the following steps:
multiplying the torque-revolution data of a single cycle working condition by a cycle extrapolation coefficient so as to reach the driving mileage of a power assembly test, thereby forming road spectrum loading data in the whole life cycle of the simulated power assembly; wherein the cyclic extrapolation coefficient is determined by the existing method;
s6, determining road spectrum loading time according to the working condition cycle times; specifically, the method comprises the following steps: the road spectrum loading time determining process comprises the following steps:
Figure BDA0002675852020000051
wherein, t Ti Is a load interval T i Test load application time of Ti Is a load interval T i Load-applied number of revolutions of (n) e And setting the rotating speed for the output shaft test of the power assembly.
S6, carrying out a road spectrum loading test on the vehicle power assembly according to the road spectrum loading data and the road spectrum loading time, wherein the road spectrum loading of the power assembly is realized by a road spectrum loading system, and as shown in FIG. 3: the road spectrum loading system comprises: the specific connection relationship among the upper computer controller, the lower computer controller, the first motor variable frequency control system, the battery simulator, the vehicle motor controller, the second motor variable frequency control system, the engine simulation motor, the vehicle powertrain, the rotating speed and torque sensor and the dynamometer motor is shown in fig. 3, in the modified drawing, arrows indicate signal flow, thin solid lines indicate direct current buses, and thick solid lines indicate mechanical transmission connection among periods.
After the road spectrum loading data is obtained, inputting the road spectrum loading data into an upper computer controller through the existing computer program, and then sending the road spectrum loading data to a lower computer controller by the upper computer controller, wherein the lower computer controller controls corresponding execution periods and comprises a first motor frequency conversion control system, a battery simulator and a second frequency conversion control system;
in new energy automobile, have pure electric powertrain and two kinds of modes of hybrid vehicle assembly, then, to pure electric powertrain, in the test:
the engine simulation motor and the corresponding frequency converter are not mechanically connected, installed and started; the battery simulator, the vehicle motor controller, the power measuring motor and the corresponding frequency converter are mechanically connected, installed and started. The upper computer control program imports actual driving speed-time history road spectrum data of the vehicle in a typical driving road section and a traffic environment, and the controller sends a starting and stopping instruction of a test system component and operation parameter data to the lower computer. The lower computer starts the battery simulator, the vehicle motor controller and the power assembly in sequence to operate according to a set speed mode and a set rotating speed. And then starting a loading dynamometer motor, and loading the dynamometer motor by calculating the torque according to a set torque mode and a road spectrum.
And for a hybrid powertrain: the engine simulation motor and the corresponding frequency converter, the battery simulator, the vehicle motor controller, the power measuring motor and the corresponding frequency converter are mechanically connected, installed and started. The upper computer control program imports actual driving speed-time history road spectrum data of the vehicle in a typical driving road section and a traffic environment, and the controller sends a starting and stopping instruction of a test system component and operation parameter data to the lower computer. The lower computer starts the battery simulator, the vehicle motor controller, the engine simulation motor and the power assembly in sequence to operate according to a set speed mode and a set rotating speed. And then starting a loading dynamometer motor, and loading the dynamometer motor by calculating the torque according to a set torque mode and a road spectrum.
When the torque set by the loading dynamometer motor is a negative value, the speed mode is automatically switched, the power assembly is switched to be in the torque mode, the power flow direction is in reverse flow at the moment, and the energy recovery working condition test of the new energy power assembly is realized.
After the loading dynamometer motor is loaded, an upper computer measurement and control program is used for timing, and after the loading of the torque time or the number of revolutions needing to be loaded in different torque intervals is completed, a stop instruction is sent, and the test device stops running.
In the test process, when the power assembly has reliability faults such as tooth breakage, shaft breakage and the like, the test device component can send error instructions and codes and automatically stop running.
By the method, the test of the power assembly is combined with the actual road spectrum load, so that the accuracy of the test result is greatly improved; the method has the advantages that the dispersed road spectrum load in the running process of the vehicle is subjected to load division and concentrated induction, the load division is processed into a limited load division, and the problem of response time in the road spectrum loading process of the dynamometer motor is solved. The invention can be used for carrying out reliability assessment on the power assembly before the new energy automobile is manufactured, and the new energy automobile power assembly can be designed according to the data after test modification, so that the whole investment of the design link of the new energy automobile power system can be reduced, and the design time of the new energy automobile can be shortened.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (2)

1. A new energy automobile power assembly road spectrum loading test method is characterized by comprising the following steps: the method comprises the following steps:
s1, acquiring running speed-time history road spectrum data of a vehicle in an actual traffic environment, and determining acceleration-time history data according to the running speed-time history road spectrum data;
s2, acquiring load-time history data of the power assembly under a single cycle working condition;
s3, dividing the load of the power assembly into a plurality of load intervals, establishing a power assembly output shaft revolution solving model in different load intervals, and determining the revolutions in different load intervals;
s4, converting the load-revolution distribution data of the power assembly under the single circulation working condition into torque-revolution distribution data, and determining the torque-revolution distribution under the single circulation working condition;
s5, determining road spectrum loading data according to the torque-revolution distribution data of the single circulation working condition;
s6, determining road spectrum loading time according to the working condition cycle times;
s7, performing a road spectrum loading test on the vehicle power assembly according to the road spectrum loading data and the road spectrum loading time;
wherein:
the powertrain load-time history data model is as follows:
Figure FDA0003776114780000011
wherein, T tq (t) -powertrain output shaft load; i all right angle o -final drive ratio; eta t -transmission efficiency; r-wheel rolling radius; m represents the whole vehicle mass; g-gravitational acceleration; f-road resistance coefficient; α — road inclination; c D -a wind resistance coefficient; a-windward area; delta-rotating mass conversion factor; f. of v (t) -a vehicle speed function with time as a variable; f. of a (t) -a vehicle acceleration function; determining the load-time history data of the power assembly through the model;
the revolution number model in different load intervals is as follows:
Figure FDA0003776114780000021
wherein N is Ti Is a load interval T i The number of revolutions of the output shaft of the lower power assembly, m is a load interval T i Number of time histories of (delta) t i Is a load interval T i Length of time history of v (t) is a function of the speed of the vehicle, i o The transmission ratio of the main speed reducer and r are the rolling radius of the wheels.
2. The new energy automobile powertrain road spectrum loading test method according to claim 1, characterized in that: the road spectrum loading time is determined by the following method:
Figure FDA0003776114780000022
wherein, t Ti Is a load interval T i Test load application time under, N Ti Is a load interval T i N is the number of load-applying revolutions e And setting the rotating speed for the output shaft test of the power assembly.
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CN112800549B (en) * 2021-03-04 2022-05-27 山东大学 Automobile road spectrum synthesis method and system based on horizontal speed and vertical speed
CN113358369B (en) * 2021-06-03 2022-05-31 江苏汇智高端工程机械创新中心有限公司 Load spectrum analysis method and system for electric drive system of mining dump truck
CN113804454B (en) * 2021-08-06 2024-03-15 中汽研汽车检验中心（天津）有限公司 Road spectrum acquisition and filtering method for dynamic ventilation test of fuel tank assembly
CN114093055A (en) * 2021-11-26 2022-02-25 海南小鲨鱼智能科技有限公司 Road spectrum generation method and device, electronic equipment and medium
CN114778141B (en) * 2022-06-17 2022-10-21 岚图汽车科技有限公司 Method, device and equipment for formulating durability test of automobile electric drive assembly rack

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CN109000922B (en) * 2018-06-11 2020-03-31 中国北方车辆研究所 Comprehensive transmission device rack durability test method based on road test
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