CN113640003B - Method for measuring knocking abnormal sound of PCV valve on engine test bed - Google Patents
Method for measuring knocking abnormal sound of PCV valve on engine test bed Download PDFInfo
- Publication number
- CN113640003B CN113640003B CN202110926165.1A CN202110926165A CN113640003B CN 113640003 B CN113640003 B CN 113640003B CN 202110926165 A CN202110926165 A CN 202110926165A CN 113640003 B CN113640003 B CN 113640003B
- Authority
- CN
- China
- Prior art keywords
- engine
- test
- pcv valve
- data
- noise
- 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.)
- Active
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
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
-
- 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
- G01M13/003—Machine valves
-
- 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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
A method for measuring PCV valve knocking abnormal sound on an engine test bed relates to a method for measuring PCV valve abnormal sound. Performing initial performance test on the engine until the engine is qualified; assembling all components and the system into a test bed by referring to the whole vehicle state; checking the engine state, and connecting INCA to carry out hot rolling; testing after reaching a specified working condition; two groups of data are acquired under each working condition, and the acquisition time of each group is 10s; and after the test is finished, comparing the test result with a judgment standard, and evaluating the reliability. And the vibration acceleration and the noise value are compared with the judgment standard through analysis and calculation, so that the interference of other parts on judging whether the PCV valve has knocking abnormal sound or not can be effectively eliminated.
Description
Technical Field
The invention relates to a method for measuring abnormal sound of a PCV valve, in particular to a method for measuring abnormal sound of knocking of the PCV valve on an engine test bed, and belongs to the technical field of engine tests.
Background
As the requirements of automobile users on the comfort of the whole automobile are higher and higher, the requirements of each automobile enterprise on the NVH performance of the power assembly are also higher and higher, and in the running process of an engine, the knocking abnormal sound of the PCV valve is one of factors influencing the NVH performance of the power assembly. Most engines today are equipped with PCV devices, i.e. positive crankcase ventilation control systems, which mainly consist of a breather hose and a PCV valve, by which the gases in the crankcase are led to the intake manifold, mainly to avoid pollution by the passage of unburned gas under high pressure from piston rings into the crankcase and out into the atmosphere.
The PCV valve consists of five parts, namely a valve seat, a valve core, a spring, an O-shaped sealing ring and a connector, wherein the connector and the valve seat are assembled and then are subjected to friction welding to finish a finished product. When the engine runs at a low rotation speed, the negative pressure of the crankcase is established by the vacuum degree of the intake manifold, when the intake manifold is at the negative pressure, air flow enters from the valve seat hole and flows out from the joint, and due to the instability of the air flow, the valve core can twist and shake violently while moving the piston, so that abnormal sound can be generated by knocking the shell. But engine body vibration and other parts can also produce abnormal sound during engine operation, thereby interfering with the technician's decision during the test regarding the impact of the PCV valve itself on the powertrain NVH performance.
Therefore, there is a need for a method that eliminates the interference of other parts and effectively determines PCV valve rattle, thereby providing a reference for powertrain NVH performance optimization.
Disclosure of Invention
In order to solve the defects in the background art, the invention provides the method for measuring the knocking abnormal sound of the PCV valve on the engine test bench, and the vibration acceleration and the noise value are calculated through analysis and compared with the judgment standard, so that the interference of other parts on judging whether the knocking abnormal sound exists in the PCV valve can be effectively eliminated.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for measuring knocking abnormal sound of PCV valve on an engine test bed comprises the following steps:
s1: performing initial performance test on the engine until the engine is qualified;
s2: all parts and systems are assembled into a test bed by referring to the whole vehicle state, the test bed comprises a dynamometer, an oil consumption meter, a cooling water circulation system, an air inlet system, an air outlet system and a piston air leakage meter, wherein the dynamometer is connected with an engine through a transmission shaft, the air inlet system is connected with an air inlet manifold on the engine, the air outlet system is connected with an air outlet manifold on the engine, the oil consumption meter is connected with the engine, the cooling water circulation system is connected with a water inlet pipe and a water outlet pipe of the engine, and the piston air leakage meter is connected with an engine ventilation hose;
s3: checking the state of the engine, connecting INCA for heating, connecting each electronic component on the engine with the ECU through a wire harness, connecting the ECU with a monitoring computer provided with INCA, monitoring and adjusting each parameter of the engine in operation, and starting the engine for heating;
s4: after the specified working condition is reached, testing is carried out, a PAK Mobile MKII data acquisition system is adopted in test equipment, a rotating speed signal is extracted through connection of a rotating speed line and a wire harness of an engine, test analysis software PAK is installed in a test computer, a vibration sensor is fixed at a PCV valve, a noise sensor is fixed right above the PCV valve, the vibration sensor and the noise sensor are respectively connected to the front end of the PAK Mobile MKII data acquisition system through connecting wires, test boundary conditions are controlled to meet test requirements, the INCA starts testing after observing that the VVT position changes from an initial position, and vibration acceleration and noise values under each working condition are calculated through analysis of the test computer;
s5: two groups of data are acquired under each working condition, the acquisition time is 10s, analysis processing is carried out on the data by using test analysis software PAK, acquired data are selected, time domain fast Fourier transform is carried out on vibration acceleration data, a data effective value RSM is selected, linear weighting is carried out on analysis calculation of over all Level, vibration acceleration peaks in 10s in an over all graph are recorded, time domain fast Fourier transform is carried out on noise data, A weighting is carried out on the data effective value RSM, analysis calculation of over all Level is carried out on the noise data, noise peaks in 10s in the over all graph are recorded, the engine speed is controlled to be 1100-2000rpm, data acquisition is carried out every 50rpm, each working condition is increased by 0.5kw every 3kw-10kw, and 15 groups of data are all recorded;
s6: after the test is completed, comparing the test result with a judgment standard, and performing reliability evaluation, wherein if the data with the vibration acceleration of more than 99% is between [0,5] g, the PCV valve is considered to have no abnormal knocking noise and does not influence NVH performance, if the data with the vibration acceleration of more than 99% is between (5, 7) g and the noise value is less than or equal to 85dB, the PCV valve is considered to have abnormal knocking noise and does not influence NVH performance, if the data with the vibration acceleration of more than 99% is between (5, 7) g and the noise value is more than 85dB, the PCV valve is considered to have abnormal knocking noise and affects NVH performance, and if the data with the vibration acceleration of more than 99% is more than 7g, the PCV valve is considered to have abnormal knocking noise and affects NVH performance.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a test bed is assembled by referring to the whole vehicle state, the PAK Mobile MKII data acquisition system is matched with the vibration sensor and the noise sensor to test the PCV valve, the vibration acceleration and the noise value are calculated through analysis and are compared with the judgment standard, the interference of other parts on judging whether the PCV valve has knocking abnormal sound or not can be effectively eliminated, the data support is provided for the design optimization of the PCV valve more accurately and effectively, and the reference is provided for the NVH performance optimization.
Drawings
FIG. 1 is a block diagram of the structure of the test stand of the present invention;
fig. 2 is a flow chart of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are all within the protection scope of the present invention.
As shown in fig. 1 to 2, a method for measuring abnormal knocking noise of a PCV valve on an engine test bench, the measurement flow is shown with reference to fig. 2, and includes the following steps:
s1: the engine performance is tested for qualification at first
The engine is executed according to GB/T19055-2003 of reliability test method of automobile engine to ensure that the initial test is qualified;
s2: all parts and systems are assembled into a test bed by referring to the whole vehicle state
The test bed is shown by referring to fig. 1, and comprises a dynamometer, a fuel consumption meter, a cooling water circulation system, an air inlet system, an air exhaust system and a piston air leakage meter, wherein an initially-tested engine is arranged on a quick-mounting trolley, centering operation is carried out to enable the engine to coincide with a shaft line of the dynamometer, then a transmission shaft is arranged to enable the dynamometer to be connected with the engine to control parameters such as engine torque, rotation speed and power, the air inlet system is connected with an air inlet manifold on the engine to realize gas supply, the air exhaust system is connected with the air exhaust manifold on the engine to realize waste gas emission, the fuel consumption meter is connected with the engine to realize fuel consumption monitoring, the cooling water circulation system is connected with a water inlet pipe and a water outlet pipe of the engine to realize water circulation, and the piston air leakage meter is connected with an engine ventilation hose to realize air leakage monitoring;
s3: checking the engine state, connecting INCA to heat the vehicle
Each electronic component on the engine is connected with the ECU through a wire harness, an OBD diagnosis port of the ECU is connected with a monitoring computer provided with INCA, so that monitoring and adjustment of various parameters of the engine in operation are realized, and the engine is started to carry out hot rolling;
s4: after reaching the specified working condition (INCA observes that the VVT position changes from the initial position, namely the VVT starts to act), the test is carried out
The test equipment adopts a PAK Mobile MKII data acquisition system, a rotating speed line is connected with a wiring harness of an engine to extract rotating speed signals, test analysis software PAK (version: 5.8) is installed in a test computer and connected with the PAK Mobile MKII data acquisition system through a network cable to acquire data, a fixed vibration sensor is stuck at the position of a PCV valve on a valve chamber cover shell of the engine, a miniature triaxial acceleration sensor with the measuring range of +/-500 g is preferably adopted, the vibration sensor is connected to the front end of the PAK Mobile MKII data acquisition system through a connecting wire, a noise sensor is fixed above the PCV valve through a microphone bracket, the fixed height is preferably set to be close to 15cm away from the PCV valve, the noise sensor is opposite to a measuring point to avoid interference to the noise sensor during test, and the noise sensor is connected to the front end of the PAKMobaileMKII data acquisition system through the connecting wire.
Control the boundary conditions of the test at the engine oil temperature: the temperature of the cooling water outlet is less than or equal to 130 ℃: 88+ -5deg.C, intake temperature: 25+ -5deg.C, exhaust temperature: the temperature is less than or equal to 850 ℃, the INCA observes that the VVT position changes from the initial position and then starts to test, and vibration acceleration and noise values under various working conditions are calculated through analysis of a test computer;
s5: two groups of data acquisition are carried out under each working condition, and the acquisition time of each group is 10s
Analyzing and processing data by using test analysis software PAK, selecting acquired data, performing time domain fast Fourier transform on vibration acceleration data, selecting a data effective value (RSM) to perform linear weighting analysis and calculation on Overall Level, recording a vibration acceleration peak value in 10s in an Overall graph, performing time domain fast Fourier transform on noise data, selecting a data effective value (RSM) to perform A weighting analysis and calculation on Overall Level, and recording a noise peak value in 10s in the Overall graph.
The engine speed is controlled at 1100-2000rpm, every 50rpm is divided into working conditions, each working condition is gradually increased from 3kw to 10kw every 0.5kw for data acquisition, 15 groups of data (each group comprises a vibration acceleration peak value and a noise peak value) are recorded twice, and the recording time is 10s each time;
s6: after the test is completed, the test result is compared with a judgment standard to evaluate the reliability
And judging that the PCV valve generates abnormal sound according to the result of experience, comparing and analyzing a test result with a judging standard, if the data of more than 99% of vibration acceleration is between [0,5] g, judging that the PCV valve does not have abnormal sound knocking and does not affect NVH performance, if the data of more than 99% of vibration acceleration is between (5, 7) g and the noise value is less than or equal to 85dB, judging that the PCV valve has abnormal sound knocking and does not affect NVH performance, if the data of more than 99% of vibration acceleration is between (5, 7) g and the noise value is more than 85dB, judging that the PCV valve has abnormal sound knocking and affects NVH performance, and if the data of more than 99% of vibration acceleration is more than 7g, judging that the PCV valve has abnormal sound knocking and affects NVH performance.
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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A method for measuring PCV valve knocking abnormal sound on an engine test bed is characterized by comprising the following steps of: the method comprises the following steps:
s1: performing initial performance test on the engine until the engine is qualified;
s2: all parts and systems are assembled into a test bed by referring to the whole vehicle state, the test bed comprises a dynamometer, an oil consumption meter, a cooling water circulation system, an air inlet system, an air outlet system and a piston air leakage meter, wherein the dynamometer is connected with an engine through a transmission shaft, the air inlet system is connected with an air inlet manifold on the engine, the air outlet system is connected with an air outlet manifold on the engine, the oil consumption meter is connected with the engine, the cooling water circulation system is connected with a water inlet pipe and a water outlet pipe of the engine, and the piston air leakage meter is connected with an engine ventilation hose;
s3: checking the state of the engine, connecting INCA for heating, connecting each electronic component on the engine with the ECU through a wire harness, connecting the ECU with a monitoring computer provided with INCA, monitoring and adjusting each parameter of the engine in operation, and starting the engine for heating;
s4: after the specified working condition is reached, testing is carried out, a PAK Mobile MKII data acquisition system is adopted in test equipment, a rotating speed signal is extracted through connection of a rotating speed line and a wire harness of an engine, test analysis software PAK is installed in a test computer, a vibration sensor is fixed at a PCV valve, a noise sensor is fixed right above the PCV valve, the vibration sensor and the noise sensor are respectively connected to the front end of the PAK Mobile MKII data acquisition system through connecting wires, test boundary conditions are controlled to meet test requirements, the INCA starts testing after observing that the VVT position changes from an initial position, and vibration acceleration and noise values under each working condition are calculated through analysis of the test computer;
s5: two groups of data are acquired under each working condition, the acquisition time is 10s, analysis processing is carried out on the data by using test analysis software PAK, acquired data are selected, time domain fast Fourier transform is carried out on vibration acceleration data, a data effective value RSM is selected, linear weighting is carried out on analysis calculation of over all Level, vibration acceleration peaks in 10s in an over all graph are recorded, time domain fast Fourier transform is carried out on noise data, A weighting is carried out on the data effective value RSM, analysis calculation of over all Level is carried out, noise peaks in 10s in the over all graph are recorded, the engine speed is controlled to be 1100-2000rpm, data acquisition is carried out every 50rpm, each working condition is divided into 15 groups of data by 0.5kw in an incremental manner every 3kw-10 kw;
s6: after the test is completed, comparing the test result with a judgment standard, and performing reliability evaluation, wherein if the data with the vibration acceleration of more than 99% is between [0,5] g, the PCV valve is considered to have no abnormal knocking noise and does not influence NVH performance, if the data with the vibration acceleration of more than 99% is between (5, 7) g and the noise value is less than or equal to 85dB, the PCV valve is considered to have abnormal knocking noise and does not influence NVH performance, if the data with the vibration acceleration of more than 99% is between (5, 7) g and the noise value is more than 85dB, the PCV valve is considered to have abnormal knocking noise and affects NVH performance, and if the data with the vibration acceleration of more than 99% is more than 7g, the PCV valve is considered to have abnormal knocking noise and affects NVH performance.
2. The method for measuring abnormal knocking noise of a PCV valve on an engine test stand according to claim 1, wherein the method comprises the steps of: the S1 is executed according to the method for testing the reliability of an automobile engine GB/T19055-2003.
3. The method for measuring abnormal knocking noise of a PCV valve on an engine test stand according to claim 1, wherein the method comprises the steps of: and the vibration sensor in the step S4 adopts a miniature triaxial acceleration sensor with the measuring range of +/-500 g.
4. The method for measuring abnormal knocking noise of a PCV valve on an engine test stand according to claim 1, wherein the method comprises the steps of: the fixed height of the noise sensor in S4 is set to 15cm from the PCV valve.
5. The method for measuring abnormal knocking noise of a PCV valve on an engine test stand according to claim 1, wherein the method comprises the steps of: the boundary condition tested in the step S4 is the engine oil temperature: the temperature of the cooling water outlet is less than or equal to 130 ℃: 88+ -5deg.C, intake temperature: 25±5 ℃ and exhaust temperature: the temperature is less than or equal to 850 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110926165.1A CN113640003B (en) | 2021-08-12 | 2021-08-12 | Method for measuring knocking abnormal sound of PCV valve on engine test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110926165.1A CN113640003B (en) | 2021-08-12 | 2021-08-12 | Method for measuring knocking abnormal sound of PCV valve on engine test bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113640003A CN113640003A (en) | 2021-11-12 |
| CN113640003B true CN113640003B (en) | 2023-05-30 |
Family
ID=78421201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110926165.1A Active CN113640003B (en) | 2021-08-12 | 2021-08-12 | Method for measuring knocking abnormal sound of PCV valve on engine test bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113640003B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320597B (en) * | 2021-12-16 | 2023-03-24 | 东风汽车集团股份有限公司 | Knocking abnormal sound identification system and method for engine valve actuating mechanism |
| CN115126571B (en) * | 2022-07-29 | 2023-08-22 | 重庆长安汽车股份有限公司 | Method for evaluating and solving abnormal sound of plunger type oil-gas separator of engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980706A (en) * | 2017-02-22 | 2017-07-25 | 中国汽车技术研究中心 | A kind of speed change gear gear taps the measuring method of energy and the evaluation method of gear percussion abnormal sound |
| CN109752183A (en) * | 2019-01-17 | 2019-05-14 | 重庆长安汽车股份有限公司 | A kind of speed changer percussion sensitivity test method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8370048B2 (en) * | 2008-09-24 | 2013-02-05 | Monros Serge V | Pollution control system |
| AU2014207621B2 (en) * | 2013-01-18 | 2018-02-08 | Serge V. Monros | Microcontroller for pollution control system for an internal combustion engine |
-
2021
- 2021-08-12 CN CN202110926165.1A patent/CN113640003B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980706A (en) * | 2017-02-22 | 2017-07-25 | 中国汽车技术研究中心 | A kind of speed change gear gear taps the measuring method of energy and the evaluation method of gear percussion abnormal sound |
| CN109752183A (en) * | 2019-01-17 | 2019-05-14 | 重庆长安汽车股份有限公司 | A kind of speed changer percussion sensitivity test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113640003A (en) | 2021-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113640003B (en) | Method for measuring knocking abnormal sound of PCV valve on engine test bed | |
| JP4509637B2 (en) | Method and apparatus for operating an internal combustion engine | |
| US20070028893A1 (en) | DSP-based engine knock detection including knock sensor and circuit diagnostics | |
| WO2010008961A2 (en) | Diagnosing a cooling subsystem of an engine system in response to dynamic pressure sensed in the subsystem | |
| JP2008128244A (en) | Diagnostic method of internal combustion engine | |
| Stuhldreher et al. | Benchmarking a 2016 Honda Civic 1.5-liter L15B7 turbocharged engine and evaluating the future efficiency potential of turbocharged engines | |
| CN105181352A (en) | Device for testing pressure relief noise of air inlet pressure relief valve of turbocharger | |
| CN113504050A (en) | Carbon deposition and coking test method and device for EGR (exhaust gas Recirculation) system | |
| CN111693291A (en) | Quantitative diagnosis method for combustion fault variable working condition of diesel engine based on vibration signal | |
| CN110073094B (en) | Engine health diagnostics and fault isolation by start-up testing | |
| CN113884312A (en) | TPA analysis model-based in-vehicle rumbling troubleshooting method | |
| Nishio et al. | New approach to low-noise air intake system development | |
| CN114235137A (en) | Abnormal sound diagnosis method based on time-frequency analysis of vibration signals inside engine cylinder | |
| CN113390592A (en) | Measuring rack for vibration intensity of range extender and measuring method thereof | |
| Abadi et al. | Single and multiple misfire detection in internal combustion engines using vold-kalman filter order-tracking | |
| US11401881B2 (en) | Fourier diagnosis of a charge cycle behavior of an internal combustion engine | |
| Jung et al. | Closed-loop control for diesel combustion noise using engine vibration signals | |
| CN114962031B (en) | Method and system for detecting coking of pipeline of air inlet system of internal combustion engine and vehicle | |
| CN205038054U (en) | Turbo charger relief valve pressure release noise test device that admits air | |
| CN112326251B (en) | Engine pre-ignition durability test method and device | |
| CN112304617B (en) | Method and device for detecting valve mechanism of engine | |
| CN114942142A (en) | Engine detonation calibration acceptance method | |
| CN115184036A (en) | Turbocharger exhaust brake negative pressure resistance test device and test method | |
| CN112378666A (en) | Engine exhaust hot end durability test method, test device and system | |
| CN113916524B (en) | Range extender assembly critical rotation speed endurance test method for range extender electric automobile |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |