CN113390592A - Measuring rack for vibration intensity of range extender and measuring method thereof - Google Patents
Measuring rack for vibration intensity of range extender and measuring method thereof Download PDFInfo
- Publication number
- CN113390592A CN113390592A CN202110686601.2A CN202110686601A CN113390592A CN 113390592 A CN113390592 A CN 113390592A CN 202110686601 A CN202110686601 A CN 202110686601A CN 113390592 A CN113390592 A CN 113390592A
- Authority
- CN
- China
- Prior art keywords
- range extender
- engine
- range
- measuring
- rotating speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
A measuring rack for vibration intensity of a range extender and a measuring method thereof belong to the technical field of range extender tests. The ECU reads parameter information on the engine, the engine is connected with a range-extending motor, and the range-extending motor is connected with the ECU; the fuel supply system supplies fuel to the engine and adjusts the pressure; the air intake system is connected with a throttle valve of the engine and provides air required by combustion for the engine; the motor cooling water circulation system and the GCU cooling water circulation system cool the range-extended motor and the GCU; the power supply system supplies power to the rack. Connecting a measuring rack; arranging vibration measuring points and sensors; working conditions are carried out, vibration and rotating speed data are measured, and analysis and calculation are carried out; and obtaining the vibration intensity and the vibration intensity grade of the range extender, and judging the operation stability. The method provides a reference basis for the design and development of the new energy automobile, makes up the blank of the measurement and analysis of the vibration intensity of the range extender, and has important guiding significance for the mass production of the range extender.
Description
Technical Field
The invention relates to a measuring rack for vibration intensity of a range extender and a measuring method thereof, belonging to the technical field of range extender tests.
Background
The tail gas of the traditional fuel oil automobile not only pollutes the environment, but also influences the health of people; although pure electric vehicles have no exhaust gas problem, the endurance mileage is obviously inferior to that of fuel-oil vehicles. Therefore, the extended range type automobile becomes a choice of more owners. The extended-range automobile gives higher requirements to the NVH of the whole automobile while giving consideration to the dynamic property and the economical efficiency of the automobile.
The range extender is the main vibration source in the range-extended automobile, and a method for measuring the related vibration intensity of the range extender is lacked at present.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a measuring rack for the vibration intensity of a range extender and a measuring method thereof.
The invention adopts the following technical scheme: a measuring rack for vibration intensity of range extender comprises
The range extender comprises an engine, a range extension motor, a GCU and an ECU;
the ECU reads parameter information on an engine, the engine is connected with a range-extending motor, and the range-extending motor is connected with the ECU;
the fuel supply system is used for supplying fuel to the engine and adjusting the pressure by matching with the pressure of an engine oil rail;
the air intake system is connected with a throttle valve of the engine and is used for providing air required by combustion for the engine;
the motor cooling water circulation system and the GCU cooling water circulation system are used for cooling the range-extended motor and the GCU and ensuring the normal operation of the range-extended motor and the GCU;
and the power supply system is used for respectively supplying power to the ECU, the GCU and the stand control unit through low-voltage lines.
The invention discloses a method for measuring vibration intensity of a range extender, which comprises the following steps:
s1: connecting a measuring rack;
s2: arranging a plurality of vibration measuring points on the range extender, and arranging a sensor on each vibration measuring point;
s3: working conditions are carried out, and vibration and rotating speed data of the range extender under each working condition are measured;
s4: performing analytical calculation on the data of S3;
s5: obtaining the vibration intensity of the range extender;
s6: and obtaining the vibration intensity grade, and judging the operation stability of the range extender.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the vibration intensity is obtained by utilizing the three-axis vibration acceleration sensor according to the measurement and analysis calculation of the specified working condition, and then the magnitude of the unit vibration energy on the measuring point is reflected, so that the weak position is determined, and a reference basis is provided for the design and development of a new energy automobile;
2. the invention analyzes the transmission path and mode, facilitates the later optimization design and makes up the blank of measuring and analyzing the vibration intensity of the range extender;
3. the invention realizes the vibration intensity test of the range extender, provides data support for developing the high-performance range extender and has important guiding significance for the mass production of the range extender.
Drawings
FIG. 1 is a schematic view of the structure of an assay stand according to the present invention;
FIG. 2 is a vibration measuring point layout diagram, wherein:
a is the front suspension of the range extender engine;
b is the range extender engine valve chamber cover;
c is a range extender motor control unit;
d is the rear end face of the range extender motor;
e is the joint of the range extender engine and the motor;
f is the engine suspension driving end of the range extender;
FIG. 3 is a schematic flow diagram of the assay method of the present invention;
FIG. 4 is a table of evaluation criteria for vibration intensity ratings;
FIG. 5 is a state diagram of operation of a slow pull-up speed full load condition;
FIG. 6 is an operating state diagram for a rapid pull-up speed full load condition;
FIG. 7 is a state diagram of operation for a rapid pull-up speed no load condition.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying 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 invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A measuring rack for vibration intensity of range extender comprises
A range extender including an engine, a range-extended motor, a GCU (motor controller), and an ECU (electronic control unit);
the ECU reads various parameter information on the engine through a wiring harness, the engine is connected with a range-extending motor through a connecting shaft, and the range-extending motor is connected with the ECU through a range-extending motor wiring harness;
the fuel supply system is used for supplying fuel to the engine and adjusting the pressure by matching with the pressure of an engine oil rail;
the air intake system is connected with a throttle valve of the engine and is used for providing air required by combustion for the engine;
the motor cooling water circulation system and the GCU cooling water circulation system are used for cooling the range-extended motor and the GCU and ensuring the normal operation of the range-extended motor and the GCU;
the power supply system is used for respectively supplying power to the ECU, the GCU and the rack control unit through low-voltage lines;
the system comprises an air inlet system, a power supply system, a cooling system, a fuel supply system and the like, and is used for ensuring the normal operation of the engine.
The rotating speed signal of the range extender is read by INCA software. The INCA software is purchased from ETAS, Inc. and the speed signal is obtained from an engine with a speed sensor.
The invention discloses a method for measuring vibration intensity of a range extender, which comprises the following steps:
s1: connecting a measuring rack according to the arrangement form of the whole vehicle;
firstly, simulation calculation of a range extender is carried out, then the same arrangement test is carried out on a rack, a whole vehicle air inlet and exhaust system is adopted, the interference-free state is ensured, and fuel oil of the range extender is provided by a rack fuel oil supply system.
S2: arranging a plurality of vibration measuring points on a range extender (the range extender is a structure for connecting an engine and a range extending motor), and arranging a sensor on each vibration measuring point;
according to the arrangement mode of the range extender on the whole vehicle and the structural characteristics of the range extender, the range extender is selected to be a front-drive vertical engine type, the rear end of the range extender is connected to the suspension part of the whole vehicle, and the position of the maximum vibration intensity point can be predicted according to the experience of similar engines through simulation calculation (calculation is performed by a design department by utilizing GT-POWER software which is purchased by an official party).
When the measuring points are arranged, the structural arrangement and the installation limitation of the range extender are considered, and the range extender is fixed on a main structure of the range extender as far as possible. The arrangement of the vibration sensors is carried out according to the attached figure 2, and the sensors adopt three-axis vibration acceleration sensors. The measuring point A, B, F is obtained according to GB/T7184-2008 'vibration measuring grade rating of medium and small power diesel engine', and other selected points are obtained by accumulating test data of various range extenders.
And arranging a plurality of three-axis vibration acceleration sensors on the range extender, and reading the rotating speed of the range extender.
S3: working conditions are carried out, and vibration and rotating speed data of the range extender under each working condition are measured by using test equipment such as a BBM data acquisition system;
the sensor is connected with the BBM multichannel data acquisition front end, and the rotating speed signal is extracted and measured from the engine speed measuring gear ring of the range extender. And arranging a three-axis vibration acceleration sensor according to the measuring point of the sensor to acquire an acceleration signal.
The direction of the engine body is defined as + X of the direction of the flywheel disc pointing to the belt pulley, + Y of the direction of the air inlet side pointing to the air exhaust side, and + Z of the direction of the engine vertically upwards. Before formally entering the test, the corresponding relation between the direction of the triaxial vibration acceleration sensor and the direction of the engine body is determined, and the direction of the sensor and the sensitivity of the sensor in three directions are input in test software.
The signal sampling frequency was set at 32000Hz, and the analysis bandwidth was 2-1024Hz (PAK (version:5.8), purchased from BBM).
The working conditions comprise a slow pulling-up rotating speed full load working condition, a fast pulling-up rotating speed no load working condition and a steady state working condition.
The slow pull-up rotating speed full-load working condition comprises the following steps:
s30101: the range extender is at the lowest power generation rotating speed (the rotating speed is 800rpm-1000 rpm);
s30102: fully opening an engine throttle valve of the range extender;
s30103: pulling up at a constant speed for 140s, so that the range extender is pulled to a peak power generation rotating speed (the rotating speed is 4800rpm-5000rpm), and the engine throttle valve state of the range extender is kept unchanged in the whole process;
s30104: repeating S30101-S30103 once.
The full-load working condition of the rapid pull-up rotating speed comprises the following steps:
s30201: the range extender is at the lowest power generation rotating speed (the rotating speed is 800rpm-1000 rpm);
s30202: fully opening an engine throttle valve of the range extender;
s30203: pulling up at a constant speed for 15s to ensure that the range extender is pulled to a peak power generation rotating speed (the rotating speed is 4800rpm-5000rpm), and the engine throttle valve state of the range extender is kept unchanged in the whole process;
s30204: repeating S30201-S30203 once.
The quick pull-up rotating speed no-load working condition comprises the following steps:
s30301: the range extender is at the lowest power generation rotating speed (the rotating speed is 800rpm-1000 rpm);
s30302: closing an engine throttle of the range extender;
s30303: pulling up at a constant speed for 15s to ensure that the range extender is pulled to a peak power generation rotating speed (the rotating speed is 4800rpm-5000rpm), and the engine throttle valve state of the range extender is kept unchanged in the whole process;
s30304: repeating S30301-S30303 once.
When the measuring point of the steady-state working condition is the engine throttle valve full-open state of the range extender, the minimum generating rotation speed +200 multiplied by N rpm and the peak generating rotation speed of the range extender are obtained, and N is a natural number; the measurement time for each measurement point was 10 s.
S4: performing analytical calculation on the data of S3;
calculating and extracting the vibration signals, performing auxiliary analysis and calculation by using software, analyzing and processing the vibration data, selecting the acquired data, performing time domain fast Fourier transform on the vibration acceleration data, and selecting a data effective value (RSM) to add linear weight to perform Overall Level analysis and calculation.
Vibration acceleration (m/s) obtained from acceleration sensor2) Converting the vibration speed (mm/s) into a vibration speed through mathematical integral operation, and observing the vibration change condition in the acceleration process according to an Overall Level curve under the acceleration working condition; and (3) the vibration speed under each rotating speed is sorted out according to the test data under the steady-state working condition, effective values of the vibration speed of the range extender in the vertical direction, the longitudinal direction and the transverse direction (acceleration signals in the three directions can be measured by a three-axis vibration acceleration sensor) are selected, and the steady-state vibration intensity test result of the range extender of the whole vehicle is obtained by calculating according to the following formula.
In the formula:
v is a vibration intensity value;
Xrmsthe effective value of the transverse speed;
Yrmsthe effective value of the longitudinal speed is obtained;
Zrmsthe vertical velocity is an effective value;
s5: obtaining the vibration intensity of the range extender by utilizing a multi-step calculation analysis method;
s6: and obtaining the vibration intensity grade according to the evaluation standard of the range extender, and judging the operation stability of the range extender.
Evaluation criteria: and (3) evaluating the vibration intensity evaluation index by using the vibration speed (mm/s), wherein the vibration intensity evaluation standard under the steady-state working condition is shown as the attached figure 4 (the engine power of the range extender is less than 90 Kw): the method is obtained by referring to GB/T7184-2008 'rating of vibration measurement level of medium and small power diesel engines', and by comprehensively testing experience.
A lower rating indicates a lower vibration intensity at the measured location, and the range extender operates more smoothly.
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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a range extender vibration intensity is with survey rack which characterized in that: comprises that
The range extender comprises an engine, a range extension motor, a GCU and an ECU;
the ECU reads parameter information on an engine, the engine is connected with a range-extending motor, and the range-extending motor is connected with the ECU;
the fuel supply system is used for supplying fuel to the engine and adjusting the pressure by matching with the pressure of an engine oil rail;
the air intake system is connected with a throttle valve of the engine and is used for providing air required by combustion for the engine;
the motor cooling water circulation system and the GCU cooling water circulation system are used for cooling the range-extended motor and the GCU and ensuring the normal operation of the range-extended motor and the GCU;
and the power supply system is used for respectively supplying power to the ECU, the GCU and the stand control unit through low-voltage lines.
2. The method for measuring the vibration intensity of a range extender according to claim 1, wherein: the method comprises the following steps:
s1: connecting a measuring rack;
s2: arranging a plurality of vibration measuring points on the range extender, and arranging a sensor on each vibration measuring point;
s3: working conditions are carried out, and vibration and rotating speed data of the range extender under each working condition are measured;
s4: performing analytical calculation on the data of S3;
s5: obtaining the vibration intensity of the range extender;
s6: and obtaining the vibration intensity grade, and judging the operation stability of the range extender.
3. The method for measuring the vibration intensity of the range extender according to claim 2, wherein: and S3, the working conditions comprise a slow pulling-up rotating speed full load working condition, a fast pulling-up rotating speed no-load working condition and a steady state working condition.
4. The method for measuring the vibration intensity of a range extender according to claim 3, wherein: the slow pull-up rotating speed full-load working condition comprises the following steps:
s30101: enabling the range extender to be at the lowest power generation rotating speed;
s30102: fully opening an engine throttle valve of the range extender;
s30103: pulling up at a constant speed for 140s to enable the range extender to be pulled to the peak power generation rotating speed, and keeping the engine throttle valve state of the range extender unchanged in the whole process;
s30104: repeating S30101-S30103 once.
5. The method for measuring the vibration intensity of a range extender according to claim 4, wherein: the full-load working condition of the rapid pull-up rotating speed comprises the following steps:
s30201: enabling the range extender to be at the lowest power generation rotating speed;
s30202: fully opening an engine throttle valve of the range extender;
s30203: pulling up at a constant speed for 15s to enable the range extender to be pulled to the peak power generation rotating speed, and keeping the engine throttle valve state of the range extender unchanged in the whole process;
s30204: repeating S30201-S30203 once.
6. The method for measuring the vibration intensity of a range extender according to claim 5, wherein: the quick pull-up rotating speed no-load working condition comprises the following steps:
s30301: enabling the range extender to be at the lowest power generation rotating speed;
s30302: closing an engine throttle of the range extender;
s30303: pulling up at a constant speed for 15s to enable the range extender to be pulled to the peak power generation rotating speed, and keeping the engine throttle valve state of the range extender unchanged in the whole process;
s30304: repeating S30301-S30303 once.
7. The method for measuring the vibration intensity of a range extender according to claim 6, wherein: when the measuring point of the steady-state working condition is the engine throttle valve full-open state of the range extender, the minimum generating rotation speed +200 multiplied by Nrpm and the peak generating rotation speed of the range extender are obtained, and N is a natural number; the measurement time for each measurement point was 10 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110686601.2A CN113390592A (en) | 2021-06-21 | 2021-06-21 | Measuring rack for vibration intensity of range extender and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110686601.2A CN113390592A (en) | 2021-06-21 | 2021-06-21 | Measuring rack for vibration intensity of range extender and measuring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113390592A true CN113390592A (en) | 2021-09-14 |
Family
ID=77623367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110686601.2A Pending CN113390592A (en) | 2021-06-21 | 2021-06-21 | Measuring rack for vibration intensity of range extender and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113390592A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916524A (en) * | 2021-10-12 | 2022-01-11 | 江西昌河汽车有限责任公司 | Endurance test method for critical rotating speed of range extender assembly for range-extended electric vehicle |
| CN114266084A (en) * | 2021-12-07 | 2022-04-01 | 大庆高新区中环电力控制系统有限公司 | Electric pump health management system and method based on vibration sensor |
| CN115077825A (en) * | 2022-05-20 | 2022-09-20 | 芜湖钻石航空发动机有限公司 | Piston type aeroengine vibration test method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482067A (en) * | 2008-08-11 | 2009-07-15 | 江西瑞来电子有限公司 | High pressure co-rail diesel engine control system with non-sensor automatic cetane number monitoring function |
| CN102135444A (en) * | 2010-12-23 | 2011-07-27 | 天津大学 | Portable power mechanical-vibration measurement analyzer |
| US20140238120A1 (en) * | 2013-02-25 | 2014-08-28 | GM Global Technology Operations LLC | System and method for detecting stochastic pre-ignition |
| CN104121102A (en) * | 2014-07-23 | 2014-10-29 | 山东大学 | Fuel feeding system of micro diesel oil ignition direct-injection natural gas engine and control method thereof |
| CN105571866A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Engine vibration spectrum extraction method |
| CN206021004U (en) * | 2016-08-31 | 2017-03-15 | 中国人民解放军装甲兵工程学院 | A kind of device for monitoring armored vehicle power drive system |
| CN108357487A (en) * | 2018-02-27 | 2018-08-03 | 吉林省赫行新能源汽车科技有限公司 | A kind of pure electric vehicle power system and its control method |
| CN112146883A (en) * | 2020-08-14 | 2020-12-29 | 哈尔滨东安汽车动力股份有限公司 | Range extender test bench and test method for testing reliability of range extender by using same |
-
2021
- 2021-06-21 CN CN202110686601.2A patent/CN113390592A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101482067A (en) * | 2008-08-11 | 2009-07-15 | 江西瑞来电子有限公司 | High pressure co-rail diesel engine control system with non-sensor automatic cetane number monitoring function |
| CN102135444A (en) * | 2010-12-23 | 2011-07-27 | 天津大学 | Portable power mechanical-vibration measurement analyzer |
| US20140238120A1 (en) * | 2013-02-25 | 2014-08-28 | GM Global Technology Operations LLC | System and method for detecting stochastic pre-ignition |
| CN104121102A (en) * | 2014-07-23 | 2014-10-29 | 山东大学 | Fuel feeding system of micro diesel oil ignition direct-injection natural gas engine and control method thereof |
| CN105571866A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Engine vibration spectrum extraction method |
| CN206021004U (en) * | 2016-08-31 | 2017-03-15 | 中国人民解放军装甲兵工程学院 | A kind of device for monitoring armored vehicle power drive system |
| CN108357487A (en) * | 2018-02-27 | 2018-08-03 | 吉林省赫行新能源汽车科技有限公司 | A kind of pure electric vehicle power system and its control method |
| CN112146883A (en) * | 2020-08-14 | 2020-12-29 | 哈尔滨东安汽车动力股份有限公司 | Range extender test bench and test method for testing reliability of range extender by using same |
Non-Patent Citations (1)
| Title |
|---|
| 杨永忠等: "不同载荷激励对非道路高压共轨柴油机振动与噪声的影响研究", 《振动与冲击》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916524A (en) * | 2021-10-12 | 2022-01-11 | 江西昌河汽车有限责任公司 | Endurance test method for critical rotating speed of range extender assembly for range-extended electric vehicle |
| CN114266084A (en) * | 2021-12-07 | 2022-04-01 | 大庆高新区中环电力控制系统有限公司 | Electric pump health management system and method based on vibration sensor |
| CN115077825A (en) * | 2022-05-20 | 2022-09-20 | 芜湖钻石航空发动机有限公司 | Piston type aeroengine vibration test method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113390592A (en) | Measuring rack for vibration intensity of range extender and measuring method thereof | |
| CN109141910B (en) | Test condition conversion method from whole vehicle to engine | |
| CN204405336U (en) | Hybrid electric vehicle complete vehicle simulation table | |
| CN107957341A (en) | A kind of hybrid vehicle test-bed and test method based on buncher | |
| Stuhldreher et al. | Benchmarking a 2016 Honda Civic 1.5-liter L15B7 turbocharged engine and evaluating the future efficiency potential of turbocharged engines | |
| CN113640003B (en) | Method for measuring knocking abnormal sound of PCV valve on engine test bed | |
| CN109781175B (en) | Device and method for decoupling energy utilization rate of power assembly for reproducing whole vehicle working condition | |
| CN108387382A (en) | A kind of road spectrum acquisition system and method | |
| CN206281648U (en) | Multi-functional electric transmission testing stand | |
| Stuhldreher et al. | Downsized boosted engine benchmarking and results | |
| CN109596253A (en) | A kind of engine output torque on-line testing analysis method | |
| CN113343482B (en) | Vehicle power system health management method based on digital twinning | |
| Stuhldreher | Fuel efficiency mapping of a 2014 6-cylinder GM EcoTec 4.3 L engine with cylinder deactivation | |
| Xu et al. | Misfire fault diagnosis of range extender based on harmonic analysis | |
| CN205038315U (en) | Automobile engine electronic apparatus comprehensive experiment device | |
| Sandoval et al. | Computational technique for turbocharger transient characterization using real driving conditions data | |
| CN108572077A (en) | A kind of automobile engine detecting system | |
| CN207717375U (en) | A kind of hybrid vehicle test-bed based on contiuously variable transmission | |
| CN102346100A (en) | Method and device for judging preheating state of vehicle | |
| Velmurugan et al. | Prediction of noise, vibration and exhaust gas emission characteristics using palm oil in a four stroke diesel | |
| CN110909458A (en) | Comprehensive performance evaluation method of air compressor | |
| Mrđa et al. | A method for quick estimation of engine moment of inertia based on an experimental analysis of transient working process | |
| Jantos et al. | Problems in assessing road vehicle driveability parameters determined with the aid of accelerometer | |
| Liu et al. | Dynamic load identification for battery pack bolt based on machine learning | |
| CN113418723A (en) | Method for measuring vibration isolation rate of finished automobile suspension |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210914 |
|
| RJ01 | Rejection of invention patent application after publication |