CN113916524A - Endurance test method for critical rotating speed of range extender assembly for range-extended electric vehicle - Google Patents
Endurance test method for critical rotating speed of range extender assembly for range-extended electric vehicle Download PDFInfo
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- CN113916524A CN113916524A CN202111185368.6A CN202111185368A CN113916524A CN 113916524 A CN113916524 A CN 113916524A CN 202111185368 A CN202111185368 A CN 202111185368A CN 113916524 A CN113916524 A CN 113916524A
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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
- G01M13/00—Testing of machine parts
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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
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Testing Of Engines (AREA)
Abstract
The invention relates to the technical field of electric automobiles, and discloses a critical rotating speed endurance test method of a range extender assembly for a range extender electric automobile, which comprises the following steps of S1: performing precision measurement on key moving parts; second step S2: respectively installing an engine and a generator; third step S3: carrying out warm-up operation on the engine; fourth step S4: adjusting the rotating speed of the engine for the first time; fifth step S5: adjusting the rotating speed of the engine for the second time; sixth step S6: the engine and the generator are separated, and the bench retest performance test is respectively carried out: seventh step S7: the engine and the generator are disassembled, the resonance frequency and the amplitude of each part are tested and analyzed, the rotating speed range with the amplitude exceeding S is screened out, the engine running time (T) reaching the fatigue cycle N is calculated, a critical rotating speed endurance cycle scheme corresponding to the range extender is established, and endurance assessment is implemented, so that the assessment of each part of the assembly is more reasonable and sufficient, and meanwhile, the assessment time is shortened.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a critical rotating speed endurance test method of a range extender assembly for a range extender electric automobile.
Background
At present, with the development of the automobile industry and the active popularization of new energy automobiles, the extended-range electric automobile can relieve the dependence degree of the pure electric automobile on a charging pile, reduce the cost of a power battery of the whole automobile, solve the problems of mileage anxiety and the like at the present stage, and is gradually industrialized. The key part of the range-extended electric automobile is a range extender, and because the range extender has a great difference with the power coupling mode of the traditional automobile, the use condition of the range extender is defined fuzziness and wider at the same time, the existing method mostly adopts an engine monomer and a generator monomer to respectively carry out durability test, the engine monomer test mostly adopts the traditional modes of WOT (throttle valve fully open) durability, start-stop durability and the like, and the reliability verification means can not meet the actual requirements of the range-extended electric automobile.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a critical rotating speed endurance test method of a range extender assembly for a range extender electric vehicle.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the critical rotating speed endurance test method of the range extender assembly for the range-extended electric vehicle comprises the following steps of:
first step S1: before the engine and the generator are installed, the key moving parts are precisely measured;
second step S2: respectively installing an engine and a generator, and completing the initial test performance test and the performance confirmation of the rack;
third step S3: the engine and the generator are connected in an integrated mode, and the engine is warmed up;
fourth step S4: regulating the rotating speed of the engine through an accelerometer on the test component for the first time;
fifth step S5: adjusting the rotating speed of the engine through an accelerometer on the test component for the second time;
sixth step S6: separating the engine and the generator, and respectively carrying out bench retest performance tests;
seventh step S7: and disassembling the engine and the generator, and precisely measuring key moving parts again to determine the abrasion loss and whether harmful abrasion occurs.
Preferably, the specific operations of the second step S2 are as follows: and respectively installing the engine and the generator, respectively completing the running-in operation, then performing respective bench initial test performance test and performance confirmation, and recording corresponding test data.
Preferably, the third step S3 includes the following specific steps: the engine and the generator are connected in an assembling mode, the engine and the generator are connected with corresponding controllers in a signal transmission mode, parts needing important examination on the range extender are subjected to acceleration sensor arrangement, and reference sensors are arranged at an engine oil disc, an engine cylinder body, a generator shell and a test bed floor to warm the engine.
Preferably, the method comprises the following steps when the engine is warmed up:
s31: the full load speed increase of the transient working condition in 60 s: 1000 rpm-rated speed;
s32: under the steady state working condition, every interval is 500rpm, and the full load speed is increased by 1500 rpm-rated speed;
s33: and recording the acceleration data of each component at each rotating speed.
Preferably, during warm-up operation of the engine, a resonance table of all parts to be tested is listed, natural resonance displacement, frequency and wave crest of each part are determined, resonance frequency and amplitude of each part are analyzed, a rotating speed range M with the amplitude exceeding S is screened out, engine operation time (T) reaching fatigue cycle N is calculated, if listed result ranges are overlapped, the longest cycle is taken as a test durability requirement, and Mn values of all parts and the calculated Tn value are integrated to form a test working condition of the cycle of the range extender critical rotating speed durability test.
Preferably, the specific data in the fourth step S4 are: and uniformly increasing the rotation speed of the engine to M1, and generating power at the rotation speed, so that the power generation working condition of the range extender assembly is P1, and the total operation time length is T1.
Preferably, the specific data in the fifth step S5 is to increase the engine speed to M2 at a constant speed, and generate power at the speed, so that the power generation condition of the range extender assembly is P2, and the total running time is T2.
(III) advantageous effects
Compared with the prior art, the invention provides a critical rotating speed endurance test method of a range extender assembly for a range extender electric automobile, which has the following beneficial effects:
according to the critical rotating speed endurance test method for the range extender assembly for the range extender electric vehicle, the rotating speed scanning is carried out on an engine, the resonance frequency and the amplitude of each part are tested and analyzed, the rotating speed range with the amplitude exceeding S is screened out, the engine running time (T) reaching the fatigue cycle N is calculated, and a critical rotating speed endurance cycle scheme corresponding to the range extender is created and endurance check is carried out. The examination of each part of the assembly is more reasonable and sufficient, and the examination time is shortened.
Drawings
FIG. 1 is a schematic diagram of the effective resonance band of the oil return pipe of the supercharger according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a critical rotation speed endurance test method for a range extender assembly for a range extender electric vehicle:
first step S1: before the engine and the generator are installed, the key moving parts are precisely measured;
second step S2: respectively installing an engine and a generator, respectively completing running-in operation, then performing respective bench initial test performance test and performance confirmation, and recording corresponding test data;
third step S3: the method comprises the following steps of performing integrated connection on an engine and a generator, performing signal transmission connection with a corresponding controller, performing acceleration sensor arrangement on parts needing key check on a range extender, and setting reference sensors at an engine oil pan, an engine cylinder body, a generator shell and a test bed floor to warm up the engine;
then the engine was run under test:
s31: the full load speed increase of the transient working condition in 60 s: 1000 rpm-rated speed;
s32: under the steady state working condition, every interval is 500rpm, and the full load speed is increased by 1500 rpm-rated speed;
s33: and recording the acceleration data of each component at each rotating speed.
And listing a resonance table of all the tested parts of the parts, and determining the natural resonance displacement, frequency and wave crest of each part. And analyzing the resonant frequency and the amplitude of each part, screening out a rotating speed range M of which the amplitude exceeds S, and calculating the running time (T) of the engine reaching the fatigue cycle N, wherein if the listed result ranges are overlapped, the longest cycle is taken as the requirement for testing the durability. And integrating the Mn value of each part and the Tn value obtained by calculation to form a test working condition of the critical rotating speed endurance test cycle of the range extender.
Fourth step S4: the method comprises the steps that the rotating speed of an engine is adjusted through an accelerometer on a test component for the first time, the accelerometer which is installed on the test component before durability is removed, the rotating speed of the engine is increased to M1 at a constant speed, power generation is carried out at the rotating speed, the power generation working condition of a range extender assembly is P1, and the total running time is T1;
fifth step S5: and adjusting the rotating speed of the engine through an accelerometer on the test component for the second time, uniformly increasing the rotating speed of the engine to M2, and generating power at the rotating speed, so that the power generation working condition of the range extender assembly is P2, and the total operation time is T2 until the critical rotating speed endurance working condition operation of all components is completed. If the replaced parts in the test do not reach the design life, the reliability of the parts is unqualified;
sixth step S6: separating the engine and the generator, and respectively carrying out bench retest performance tests, wherein the attenuation rates of main performance parameters of the engine and the generator relative to the initial performance of the bench are in accordance with relevant requirements;
seventh step S7: and disassembling the engine and the generator, and precisely measuring key moving parts again to determine the abrasion loss and whether harmful abrasion occurs.
The above parameters such as "fatigue cycle N", "amplitude S", "rotation speed range M" need to be selected and determined by development technicians according to the material of the component, the installation position, and other factors.
And (3) carrying out rotating speed scanning on the engine, testing and analyzing the resonant frequency and the amplitude of each part, screening out a rotating speed range of which the amplitude exceeds S, calculating the engine running time (T) reaching the fatigue cycle N, creating a critical rotating speed endurance cycle scheme corresponding to the range extender, and implementing endurance check. The examination of each part of the assembly is more reasonable and sufficient, and the examination time is shortened.
And (4) obtaining the resonance frequency and the amplitude of each part through the rotation speed scanning of the engine, and determining the critical rotation speed of each part. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The critical rotating speed endurance test method of the range extender assembly for the range-extended electric vehicle is characterized by comprising the following steps of: the method comprises the following steps:
first step S1: before the engine and the generator are installed, the key moving parts are precisely measured;
second step S2: respectively installing an engine and a generator, and completing the initial test performance test and the performance confirmation of the rack;
third step S3: the engine and the generator are connected in an integrated mode, and the engine is warmed up;
fourth step S4: regulating the rotating speed of the engine through an accelerometer on the test component for the first time;
fifth step S5: adjusting the rotating speed of the engine through an accelerometer on the test component for the second time;
sixth step S6: separating the engine and the generator, and respectively carrying out bench retest performance tests;
seventh step S7: and disassembling the engine and the generator, and precisely measuring key moving parts again to determine the abrasion loss and whether harmful abrasion occurs.
2. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 1, wherein: the second step S2 includes the following specific operations: and respectively installing the engine and the generator, respectively completing the running-in operation, then performing respective bench initial test performance test and performance confirmation, and recording corresponding test data.
3. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 1, wherein: the third step S3 includes the following steps: the engine and the generator are connected in an assembling mode, the engine and the generator are connected with corresponding controllers in a signal transmission mode, parts needing important examination on the range extender are subjected to acceleration sensor arrangement, and reference sensors are arranged at an engine oil disc, an engine cylinder body, a generator shell and a test bed floor to warm the engine.
4. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 3, wherein: the method comprises the following steps when the engine is warmed up:
s31: the full load speed increase of the transient working condition in 60 s: 1000 rpm-rated speed;
s32: under the steady state working condition, every interval is 500rpm, and the full load speed is increased by 1500 rpm-rated speed;
s33: and recording the acceleration data of each component at each rotating speed.
5. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 4, wherein: when the engine is warmed up, a resonance table of all parts to be tested is listed, natural resonance displacement, frequency and wave crest of each part are determined, resonance frequency and amplitude of each part are analyzed, a rotating speed range M with the amplitude exceeding S is screened out, engine running time (T) reaching fatigue cycle N is calculated, if listed result ranges are overlapped, the longest cycle is taken as a test durability requirement, Mn values of all parts and the calculated Tn value are integrated, and a test working condition of a cycle of a range extender critical rotating speed durability test is formed.
6. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 1, wherein: the specific data of the fourth step S4 are: and uniformly increasing the rotation speed of the engine to M1, and generating power at the rotation speed, so that the power generation working condition of the range extender assembly is P1, and the total operation time length is T1.
7. The method for testing the critical rotation speed durability of the range extender assembly for the range-extended electric vehicle according to claim 1, wherein: and step S5, uniformly increasing the engine speed to M2, and generating power at the speed, so that the power generation working condition of the range extender assembly is P2, and the total running time is T2.
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