CN114942142A - Engine detonation calibration acceptance method - Google Patents
Engine detonation calibration acceptance method Download PDFInfo
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- CN114942142A CN114942142A CN202210474728.2A CN202210474728A CN114942142A CN 114942142 A CN114942142 A CN 114942142A CN 202210474728 A CN202210474728 A CN 202210474728A CN 114942142 A CN114942142 A CN 114942142A
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- 238000005474 detonation Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 56
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052802 copper Inorganic materials 0.000 claims abstract description 20
- 239000010949 copper Substances 0.000 claims abstract description 20
- 241000976924 Inca Species 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000011056 performance test Methods 0.000 claims description 11
- 239000010705 motor oil Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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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
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
-
- 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
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
Abstract
An engine knock calibration acceptance method relates to an acceptance method. Confirming test boundary conditions, and installing a combustion analyzer and a copper pipe between an engine and a rack; connecting an INCA (inertial navigation System) to a detonation module to call a YT oscilloscope, adding detection variables, sequentially carrying out test working conditions, carrying out detonation test according to the test working conditions, acquiring test data of each group of working conditions corresponding to three detonation conditions, and synchronously comparing the detonation conditions of a copper pipe with a KP-PK detonation energy curve of a combustion analyzer; the MDA software is used for processing and analyzing the collected test data, calling a variable curve and knowing the engine knocking condition of the test data under the INCA monitoring; and counting the knocking times and the maximum knocking receding angle degree acquired by the INCA data, comparing the knocking times and the maximum knocking receding angle degree with the conditions detected by the combustion analyzer and the copper pipe, and determining that the results are consistent. And the method adopts INCA test data, a combustion analyzer and a copper pipe to comprehensively judge whether knocking is identified, so that the result is more accurate and convincing.
Description
Technical Field
The invention relates to an acceptance method, in particular to an engine knock calibration acceptance method, and belongs to the technical field of engine detection.
Background
The detonation is an abnormal combustion phenomenon of the engine, and is caused by the advance of an ignition angle of the engine, overhigh temperature, overlow octane number of fuel oil and the like, and causes the problems of abnormal vibration of the engine sound, weakening of the output power of the engine, temperature rise, oil consumption increase and the like. After the calibration of the engine pedestal is completed, in the whole vehicle test and the use process of a user, because the boundary cannot be ensured, if the calibration data is not well controlled, knocking can be caused, and a series of serious problems such as engine damage and the like can be caused. Therefore, the knock module is particularly important during engine calibration acceptance. The existing engine knock test methods include cylinder pressure detection, engine vibration detection, cylinder temperature detection and the like, but for engine performance and model calibration acceptance, an engine knock calibration acceptance method is still lacked up to now.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the engine knock calibration acceptance method, which comprehensively judges whether the knock is identified by adopting INCA test data, a combustion analyzer and a copper pipe, provides a comprehensive multi-angle knock calibration acceptance method for the engine acceptance, and has more accurate and convincing results.
In order to achieve the purpose, the invention adopts the following technical scheme: an engine knock calibration acceptance method comprises the following steps:
step one, loading an engine on a performance test bench, and confirming test boundary conditions, wherein the test boundary conditions are the following conditions for ensuring bench parameters: the temperature of outlet water is more than 88 ℃, the temperature of engine oil is more than 88 ℃, the relative humidity is more than 40 ℃ and the exhaust temperature is less than 850 ℃, so that the engine is allowed to carry out a detonation test, and a combustion analyzer and a copper pipe are respectively arranged between the engine and the performance test bed;
step two, a YT oscilloscope is called in a detonation module by connecting INCA, detection variables are added in the YT oscilloscope, the detection variables comprise engine rotating speed, ignition advance angle, detonation threshold value of each cylinder, detonation energy value and detonation receding angle of each cylinder, bench test working conditions including four groups of rotating speeds of 1600rpm, 2000rpm, 4400rpm and 6000rpm are set, the four groups of rotating speeds respectively correspond to two groups of loads of 80% and 100%, eight groups of working conditions are counted, eight groups of working conditions are adjusted by a performance test bench in sequence, detonation is manufactured according to the test working conditions, test data of three detonation conditions of original ignition angle detonation, scattered detonation and strong detonation are acquired by each group of working conditions, the ignition angle is not changed under the original ignition angle detonation condition, the detonation frequency generated in one minute under the scattered detonation condition is less than 10, the detonation frequency generated in one minute under the strong detonation condition is more than or equal to 10, synchronously comparing the knocking condition of the copper pipe with a KP-PK knocking energy curve of the combustion analyzer, if KP-PK is less than 0.3, considering that no knocking occurs, if KP-PK is more than or equal to 0.3 and less than or equal to 0.7, considering that slight knocking occurs, and if KP-PK is more than 0.7, considering that strong knocking occurs;
thirdly, processing and analyzing the collected test data by using MDA software, calling a variable detonation energy value, a detonation threshold value of each cylinder, a detonation receding angle of each cylinder and an engine rotating speed curve, knowing the detonation condition of the engine of the test data under the monitoring of INCA, firstly checking the original ignition angle detonation state of each working condition, if no detonation or sporadic detonation exists, then checking the sporadic detonation and strong detonation state of each working condition, when the detonation energy value exceeds the detonation threshold value of each cylinder, checking whether the corresponding cylinder produces a receding angle in time, if the receding angle is in time, then the test data corresponding to the detonation can be accepted, if the receding angle is not in time, identifying that the detonation is insufficient, and if the corresponding test data is not qualified, readjusting is needed;
and step four, counting the knocking times and the maximum knocking back angle degree acquired by the INCA data, comparing the knocking times and the maximum knocking back angle degree with the conditions detected by the combustion analyzer and the copper pipe, determining that the data are qualified if the results are consistent, and determining that the data are unqualified if the results are inconsistent and readjusting the data.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts INCA test data, a combustion analyzer and a copper pipe to comprehensively judge whether the detonation is recognized or not, is beneficial to solving the misjudgment of the detonation, provides a comprehensive multi-angle detonation calibration acceptance method for the acceptance of the engine, ensures that the result is more accurate and convincing, provides the test working condition of the detonation test, ensures that the work becomes simpler and clearer, makes the detonation calibration acceptance flow, can accurately judge whether the detonation calibration is qualified or not, saves time and labor, has high operation execution effectiveness, and ensures that the test working condition of the detonation test, the detonation manufacturing method and the comprehensive judgment standard in the acceptance process are more reliable and efficient.
Drawings
FIG. 1 is a flow chart of an engine knock calibration acceptance method of the present invention;
FIG. 2 is a graph of the operating condition of 4400rpm and the original ignition angle of 100% load in the embodiment;
FIG. 3 is a graph of operating conditions at 4400rpm, 100% load plus 3 ignition angle for the example;
fig. 4 is a summary diagram of the knocking situation in the embodiment.
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.
As shown in FIG. 1, an engine knock calibration acceptance method comprises the following steps:
step one, loading an engine on a performance test bench, and confirming test boundary conditions, wherein the test boundary conditions are the parameters of the bench: the temperature of outlet water is more than 88 ℃, the temperature of engine oil is more than 88 ℃, the relative humidity is more than 40 ℃ and the exhaust temperature is less than 850 ℃, the engine is ensured to be allowed to carry out detonation test, and a combustion analyzer and a copper pipe are respectively arranged between the engine and a performance test bench;
step two, a YT oscilloscope is called in a detonation module by connecting INCA, detection variables are added in the YT oscilloscope, the detection variables comprise engine rotating speed, ignition advance angle, detonation threshold value of each cylinder, detonation energy value and detonation receding angle of each cylinder, bench test working conditions are set to comprise four groups of rotating speeds of 1600rpm, 2000rpm, 4400rpm and 6000rpm, the four groups of rotating speeds respectively correspond to two groups of loads of 80% and 100%, eight groups of working conditions are counted, eight groups of working conditions are adjusted in sequence through a performance test bench, actual ignition angle is increased by manually adjusting an ignition advance angle MAP table or air inlet temperature is increased through the performance test bench to manufacture detonation, detonation test is carried out according to the test working conditions, and test data of three detonation conditions of original ignition angle detonation (ignition angle is not changed), zero-star detonation (detonation frequency generated in one minute is less than 10 times) and detonation intensity (detonation frequency generated in one minute is more than or equal to 10 times) are acquired for each group of working conditions, collecting three detonation conditions corresponding to each group of working conditions for one minute respectively, synchronously comparing the detonation conditions of the copper pipe with KP-PK detonation energy curves of a combustion analyzer, if KP-PK is less than 0.3, determining that no detonation exists, if KP-PK is more than or equal to 0.3 and less than or equal to 0.7, determining that slight detonation exists, and if KP-PK is more than 0.7, determining that strong detonation exists;
thirdly, processing and analyzing the acquired test data by using MDA software, calling curves of variable detonation energy values, detonation threshold values of all cylinders, detonation angles of all cylinders and engine rotation speed, knowing the detonation condition of the engine under the INCA monitoring of the test data, firstly checking the detonation state of the original ignition angle of each working condition, if no detonation or sporadic detonation exists, receiving the test data corresponding to the original ignition angle, then checking the sporadic detonation and strong detonation states of each working condition, when the detonation energy values exceed the detonation threshold values of all cylinders, checking whether the corresponding cylinders generate the angles in time, if the angles in time are removed, receiving the test data corresponding to the detonation, if the angles in time are removed, identifying that the detonation is insufficient, and if the corresponding test data are not qualified, and readjusting;
and step four, counting the knocking times and the maximum knocking back angle degree acquired by the INCA data, comparing the knocking times and the maximum knocking back angle degree with the conditions detected by the combustion analyzer and the copper pipe, determining that the data are qualified if the results are consistent, and determining that the data are unqualified if the results are inconsistent and readjusting the data.
Examples
In the embodiment, an N20L engine produced by Harbin Togan automotive Power GmbH is adopted to carry out the knock calibration acceptance example of the invention, which comprises the following steps:
step one, the engine state is confirmed to be free of problems, and the test boundary conditions ensure the parameters of the rack: the outlet water temperature is 89 ℃, the engine oil temperature is 89 ℃, the relative humidity is 50 ℃ and the exhaust temperature is 736 ℃, and the detonation test can be carried out after the combustion analyzer and the copper pipe are installed;
connecting INCA to a knock module to call a YT oscilloscope, adding detection variables into the YT oscilloscope, wherein the detection variables comprise engine rotation speed, ignition advance angle, knock threshold value of each cylinder, knock energy value and knock retreat angle of each cylinder, setting a bench test working condition to 4400rpm, adjusting corresponding torque to 100% load, manually adjusting an ignition advance angle MAP table to increase an actual ignition angle to manufacture knock, carrying out knock test according to the test working condition, and acquiring test data corresponding to three knock conditions of original ignition angle knock (ignition angle is not changed), sporadic knock (the number of times of knocking generated in one minute is less than 10 times) and strong knock (the number of times of knocking generated in one minute is more than or equal to 10 times), wherein the three knock conditions are respectively acquired in one minute, and synchronously comparing the knock condition of a copper pipe with a KP-PK energy curve of a combustion analyzer;
step three, utilizing MDA software to process and analyze collected test data, calling curves of variable detonation energy values, detonation threshold values of cylinders, detonation receding angles of cylinders and engine rotation speed, firstly checking a detonation state of an original ignition angle of a current working condition, referring to a graph of 4400rpm and an original ignition angle of 100% load shown in figure 2, wherein 1-4 represent detonation threshold values of the cylinders, 5-8 represent detonation receding angles of the cylinders, 9 represent engine rotation speed and 10 represent detonation energy values, no detonation exists in the current working condition, then checking a graph of adding 3 degrees of ignition angle to generate strong detonation, referring to a graph of 4400rpm and generating strong detonation by adding 3 degrees of ignition angle shown in figure 3, wherein 1-4 represent detonation threshold values of the cylinders, 5-8 represent detonation receding angles of the cylinders, 9 represents engine rotation speed, 10 represents detonation energy values, and when the detonation energy values exceed the detonation threshold values of the cylinders, the cylinder corresponding to the engine can quickly react to generate a receding angle, 15 times of knocking and receding angles can be generated in the figure 3, and test data can be accepted;
and step four, counting the knocking times and the maximum knocking retreat angle degree acquired by the INCA data, comparing the knocking times and the maximum knocking retreat angle degree with the conditions detected by the combustion analyzer and the copper pipe, wherein the result shows that no knocking or sporadic knocking exists under the condition that the ignition angle is not added in the original state, the INCA data identification is basically consistent with the performance of the copper pipe and the combustion analyzer, when the ignition angle is added to manufacture knocking, the knocking times of the INCA are basically consistent with the performance of the copper pipe and the combustion analyzer, and corresponding retreat angle protection actions are performed, and the knocking conditions are summarized and are shown in a figure 4, and the results are consistent and qualified.
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 (3)
1. An engine knock calibration acceptance method is characterized in that: the method comprises the following steps:
step one, loading an engine on a performance test bench, and confirming test boundary conditions, wherein the test boundary conditions are the following conditions for ensuring bench parameters: the temperature of outlet water is more than 88 ℃, the temperature of engine oil is more than 88 ℃, the relative humidity is more than 40 ℃ and the exhaust temperature is less than 850 ℃, so that the engine is allowed to carry out a detonation test, and a combustion analyzer and a copper pipe are respectively arranged between the engine and the performance test bed;
step two, a YT oscilloscope is called from a detonation module by connecting INCA, detection variables are added into the YT oscilloscope, the detection variables comprise engine rotation speed, ignition advance angle, detonation threshold value of each cylinder, detonation energy value and detonation receding angle of each cylinder, bench test working conditions are set to comprise four groups of rotation speeds of 1600rpm, 2000rpm, 4400rpm and 6000rpm, the four groups of rotation speeds respectively correspond to torque adjustment to two groups of loads of 80% and 100%, eight groups of working conditions are counted, eight groups of working conditions are adjusted through a performance test bench in sequence, detonation is manufactured according to the test working conditions, detonation test is carried out on each group of working conditions, test data of three detonation conditions of original ignition angle detonation, sporadic detonation and strong detonation are collected, the detonation frequency is less than 10 times in one minute under the condition of original ignition angle detonation, the detonation frequency is more than or equal to 10 times in one minute under the condition of intense detonation, synchronously comparing the knocking condition of the copper pipe with a KP-PK knocking energy curve of the combustion analyzer, if KP-PK is less than 0.3, determining that no knocking exists, if KP-PK is more than or equal to 0.3 and less than or equal to 0.7, determining that slight knocking exists, and if KP-PK is more than 0.7, determining that strong knocking exists;
thirdly, processing and analyzing the collected test data by using MDA software, calling a variable detonation energy value, a detonation threshold value of each cylinder, a detonation receding angle of each cylinder and an engine rotating speed curve, knowing the detonation condition of the engine of the test data under the monitoring of INCA, firstly checking the original ignition angle detonation state of each working condition, if no detonation or sporadic detonation exists, then checking the sporadic detonation and strong detonation state of each working condition, when the detonation energy value exceeds the detonation threshold value of each cylinder, checking whether the corresponding cylinder produces a receding angle in time, if the receding angle is in time, then the test data corresponding to the detonation can be accepted, if the receding angle is not in time, identifying that the detonation is insufficient, and if the corresponding test data is not qualified, readjusting is needed;
and step four, counting the knocking times and the maximum knocking back angle degree acquired by the INCA data, comparing the knocking times and the maximum knocking back angle degree with the conditions detected by the combustion analyzer and the copper pipe, determining that the data are qualified if the results are consistent, and determining that the data are unqualified if the results are inconsistent and readjusting the data.
2. The engine knock calibration acceptance method according to claim 1, wherein: and in the second step, the knocking is realized by increasing the actual ignition angle through manually adjusting an ignition advance angle MAP table or increasing the air inlet temperature through a performance test bench.
3. The engine knock calibration acceptance method according to claim 1, wherein: and in the second step, three detonation conditions corresponding to each group of working conditions are respectively collected for one minute.
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Cited By (1)
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| CN116447060A (en) * | 2023-04-28 | 2023-07-18 | 东风汽车集团股份有限公司 | Control method and control system of engine |
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