CN113916524B - Range extender assembly critical rotation speed endurance test method for range extender electric automobile - Google Patents
Range extender assembly critical rotation speed endurance test method for range extender electric automobile Download PDFInfo
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- CN113916524B CN113916524B CN202111185368.6A CN202111185368A CN113916524B CN 113916524 B CN113916524 B CN 113916524B CN 202111185368 A CN202111185368 A CN 202111185368A CN 113916524 B CN113916524 B CN 113916524B
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- G—PHYSICS
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- 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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to the technical field of electric automobiles, and discloses a range extender assembly critical rotation speed endurance test method for a range extender electric automobile, which comprises the following steps of S1: precisely measuring the key moving parts; second step S2: installing an engine and a generator respectively; third step S3: performing a warm-up operation on the engine; fourth step S4: the rotating speed of the engine is adjusted for the first time; fifth step S5: the rotating speed of the engine is adjusted for the second time; sixth step S6: separating an engine and a generator, and respectively carrying out bench retest performance tests: 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 of which the amplitude exceeds S is screened out, the engine running time (T) reaching the fatigue cycle N is calculated, a critical rotating speed durable circulation scheme corresponding to the range extender is created, durable assessment is implemented, the assessment of each part of the assembly is more reasonable and sufficient, and the assessment time is shortened.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a critical rotation 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 positive popularization of new energy automobiles, the range-extended electric automobile can alleviate the dependence 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 of users and the like at the present stage, and is industrialized step by step. The key components of the range extender are the range extender, and because the range extender has larger difference with the power coupling mode of the traditional automobile, the service condition of the range extender is defined to be fuzzy and wider on one hand, and the existing single engine and single generator are adopted to respectively carry out durability test, and the single engine test is mainly carried out by adopting the traditional modes of WOT (full open throttle) durability, start-stop durability and the like, the reliability verification means of the range extender cannot meet the actual requirements of the range extender electric automobile.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a critical rotation speed endurance test method of a range extender assembly for a range-extending electric automobile.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the endurance test method of the critical rotation speed of the range extender assembly for the range extender electric automobile comprises the following steps:
first step S1: precisely measuring key moving parts before an engine and a generator are installed;
second step S2: installing the engine and the generator respectively, and completing a bench initial performance test and performance confirmation;
third step S3: the engine and the generator are connected in a combined way, and the engine is warmed up;
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;
fifth step S5: the second time, the rotating speed of the engine is regulated through an accelerometer on the test part;
sixth step S6: separating an engine and a generator, and respectively performing bench retest performance tests;
seventh step S7: and disassembling the engine and the generator, precisely measuring the key moving parts again, and determining the abrasion loss and whether harmful abrasion occurs.
Preferably, the specific operation of the second step S2 is as follows: and (3) respectively installing the engine and the generator, respectively carrying out initial performance tests of respective racks after running-in operation, confirming the completion performance, and recording corresponding test data.
Preferably, the specific steps of the third step S3 are as follows: the engine and the generator are connected in a combined mode and are connected with corresponding controllers in a signal transmission mode, acceleration sensors are arranged on parts, needing important assessment, of the range extender, reference sensors are arranged at the positions of an engine oil disc, an engine cylinder body, a generator shell and a test bench floor, and the engine is warmed up.
Preferably, the warm-up operation of the engine includes the steps of:
s31: transient conditions are full load ramp up in 60 s: 1000 rpm-rated speed;
s32: every 500rpm of steady-state working condition, and the full load speed-up speed is 1500 rpm-rated rotation speed;
s33: and acceleration data of each component at each rotational speed is recorded.
Preferably, when the engine is warmed up, resonance tables of all parts are listed, natural resonance displacement, frequency and wave peaks of all parts are determined, resonance frequency and amplitude of all parts are analyzed, a rotating speed range M with the amplitude exceeding S is screened out, engine running time (T) reaching a fatigue cycle N is calculated, if the listed result ranges overlap, the longest cycle is taken as a test durability requirement, mn values of all parts and Tn values obtained through calculation are synthesized, and test working conditions of a critical rotating speed durability test cycle of the range extender are formed.
Preferably, the specific data of the fourth step S4 are: and (3) uniformly increasing the rotating speed of the engine to M1, and generating power at the rotating speed, so that the power generation working condition of the range extender assembly is P1, and the total operation time is T1.
Preferably, the specific data of the fifth step S5 is to increase the rotation speed of the engine to M2 at a constant speed, and generate power at the rotation speed, so that the power generation working condition of the range extender assembly is P2, and the total operation duration is T2.
(III) beneficial effects
Compared with the prior art, the invention provides a endurance test method for the critical rotation speed of the range extender assembly for the range extender electric automobile, which has the following beneficial effects:
according to the critical rotation speed endurance test method of the range extender assembly for the range extender electric automobile, through rotation speed scanning of an engine, resonance frequency and amplitude of each part are tested and analyzed, a rotation speed range of which the amplitude exceeds S is screened out, engine running time (T) reaching fatigue cycle N is calculated, a critical rotation speed endurance circulation scheme corresponding to the range extender is created, and endurance assessment is implemented. The examination of each component of the assembly is more reasonable and sufficient, and meanwhile, 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 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a endurance test method for critical rotation speed of a range extender assembly for a range-extending electric vehicle includes:
first step S1: precisely measuring key moving parts before an engine and a generator are installed;
second step S2: installing an engine and a generator respectively, performing initial bench test performance tests and performance confirmation after running-in operation are completed respectively, and recording corresponding test data;
third step S3: the method comprises the steps of carrying out combined connection on an engine and a generator, carrying out signal transmission connection with a corresponding controller, carrying out acceleration sensor arrangement on parts needing to be subjected to important examination on a range extender, arranging reference sensors at the positions of an engine oil pan, an engine cylinder body, a generator shell and a test bench floor, and carrying out warm-up operation on the engine;
the engine is then tested for operation:
s31: transient conditions are full load ramp up in 60 s: 1000 rpm-rated speed;
s32: every 500rpm of steady-state working condition, and the full load speed-up speed is 1500 rpm-rated rotation speed;
s33: and acceleration data of each component at each rotational speed is recorded.
And listing the resonance tables of all the parts to be tested, and determining the natural resonance displacement, frequency and wave crest of each part. Analyzing the resonance frequency and amplitude of each part, screening out the rotating speed range M with the amplitude exceeding S, calculating the engine running time (T) reaching the fatigue cycle N, and taking the longest cycle as the test endurance requirement if the listed result ranges overlap. And combining the Mn value and the calculated Tn value of each component to form the 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 part for the first time, the accelerometers which are arranged on the test part before being removed before endurance are used, the rotating speed of the engine is increased to M1 at a constant speed, and power generation is carried out at the rotating speed, so that the power generation working condition of a range extender assembly is P1, and the total operation time is T1;
fifth step S5: and the second time, the rotating speed of the engine is regulated through the accelerometer on the test part, the rotating speed of the engine is increased to M2 at a constant speed, and power generation is carried out at the rotating speed, so that the power generation working condition of the range extender assembly is P2, the total operation time is T2, and the operation under the critical rotating speed durable working condition of all parts is completed. The reliability of the parts which are replaced in the test is unqualified if the design life of the parts is not reached;
sixth step S6: separating an engine and a generator, and respectively performing bench retest performance tests, wherein the attenuation rate of main performance parameters of the engine and the generator relative to initial performance of the bench meets relevant requirements;
seventh step S7: and disassembling the engine and the generator, precisely measuring the key moving parts again, and determining the abrasion loss and whether harmful abrasion occurs.
The parameters such as the fatigue cycle N, the amplitude S, the rotating speed range M and the like need to be selected and determined by a development technician according to the factors such as the materials of parts and the installation positions.
The engine is subjected to rotating speed scanning, resonance frequency and amplitude of each part are tested and analyzed, a rotating speed range of which the amplitude exceeds S is screened out, engine running time (T) reaching fatigue cycle N is calculated, a critical rotating speed endurance cycle scheme corresponding to the range extender is created, and endurance assessment is implemented. The examination of each component of the assembly is more reasonable and sufficient, and meanwhile, the examination time is shortened.
And (5) obtaining the resonance frequency and the amplitude of each part through engine speed scanning, and determining the critical 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 characteristics 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 understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The endurance test method for the critical rotation speed of the range extender assembly for the range extender electric automobile is characterized by comprising the following steps of: the method comprises the following steps:
first step S1: precisely measuring key moving parts before an engine and a generator are installed;
second step S2: installing the engine and the generator respectively, and completing a bench initial performance test and performance confirmation;
third step S3: the engine and the generator are connected in a combined way, and the engine is warmed up;
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;
fifth step S5: the second time, the rotating speed of the engine is regulated through an accelerometer on the test part;
sixth step S6: separating an engine and a generator, and respectively performing bench retest performance tests;
seventh step S7: disassembling the engine and the generator, precisely measuring key moving parts again, and determining the abrasion loss and whether harmful abrasion occurs;
the specific operation of the second step S2 is as follows: installing an engine and a generator respectively, performing initial bench test performance tests and performance confirmation after running-in operation are completed respectively, and recording corresponding test data;
the specific steps of the third step S3 are as follows: the method comprises the steps of carrying out combined connection on an engine and a generator, carrying out signal transmission connection with a corresponding controller, carrying out acceleration sensor arrangement on parts needing to be subjected to important examination on a range extender, arranging reference sensors at the positions of an engine oil pan, an engine cylinder body, a generator shell and a test bench floor, and carrying out warm-up operation on the engine;
the warm-up operation of the engine includes the steps of:
s31: transient conditions are full load ramp up in 60 s: 1000 rpm-rated speed;
s32: every 500rpm of steady-state working condition, and the full load speed-up speed is 1500 rpm-rated rotation speed;
s33: recording acceleration data of each part at each rotating speed;
when the engine is warmed up, resonance tables of all parts are listed, natural resonance displacement, frequency and wave peaks of all parts are determined, resonance frequency and amplitude of all parts are analyzed, a rotating speed range M with the amplitude exceeding S is screened out, engine running time T reaching a fatigue cycle N is calculated, if the listed result ranges overlap, the longest cycle is taken as a test endurance requirement, mn values of all parts and Tn values obtained through calculation are synthesized, and test working conditions of a critical rotating speed endurance test cycle of the range extender are formed.
2. The endurance test method for the critical rotation speed of the range extender assembly for the extended-range electric automobile according to claim 1, wherein the endurance test method is characterized by comprising the following steps of: the specific data of the fourth step S4 are: and (3) uniformly increasing the rotating speed of the engine to M1, and generating power at the rotating speed, so that the power generation working condition of the range extender assembly is P1, and the total operation time is T1.
3. The endurance test method for the critical rotation speed of the range extender assembly for the extended-range electric automobile according to claim 1, wherein the endurance test method is characterized by comprising the following steps of: and step S5, the specific data is that the rotating speed of the engine is increased to M2 at a constant speed, and power generation is carried out 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.
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