CN111980821A - Super knock control system and method - Google Patents
Super knock control system and method Download PDFInfo
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- CN111980821A CN111980821A CN202010844688.7A CN202010844688A CN111980821A CN 111980821 A CN111980821 A CN 111980821A CN 202010844688 A CN202010844688 A CN 202010844688A CN 111980821 A CN111980821 A CN 111980821A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000446 fuel Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010801 machine learning Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a super knock control system and a super knock control method, wherein engine operation parameters of a plurality of working cycles before an nth working cycle are analyzed to obtain an engine operation change trend, engine operation parameters in a plurality of working cycles after the nth working cycle are predicted according to the engine operation parameters in the nth working cycle and the engine operation change trend, then the probability of super knock occurrence in the plurality of working cycles after the nth working cycle is calculated according to the predicted engine operation parameters in the plurality of working cycles after the nth working cycle, and is compared with a set threshold value to judge whether super knock is about to occur, and if the super knock occurrence is inhibited, measures are taken to inhibit the super knock occurrence. Compared with the prior art, the super knock is predicted and controlled in advance by taking measures before the super knock occurs, so that the super knock can be avoided.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a super knock control system and a super knock control method.
Background
The direct injection supercharging small displacement is an important way for realizing the energy saving of the gasoline engine. However, with the continuous increase of the pressure increase ratio and the power density, an intense knock (engine knock) phenomenon, namely 'super knock', occurs, the peak pressure in the cylinder can even exceed 30MPa, the pressure oscillation amplitude can exceed 20MPa, and a spark plug, a valve and a piston are easy to break or ablate, so that the engine can be damaged instantly.
Because super knocking has great damage to the engine, super knocking can be regarded as the most important limiting factor for further cylinder shrinkage strengthening of the engine, and is the main obstacle encountered by the boosting direct injection gasoline engine to increase power and reduce fuel consumption rate at present.
The engine controller identifies super knock through a knock sensor at present, and once super knock occurs, corresponding measures are taken to inhibit the super knock, such as air-fuel ratio enrichment, valve overlap angle reduction, load limitation, even oil interruption and the like. But super knock has already occurred at this time, and thus belongs to passive control and does not have active control. Therefore, in practical application, the occurrence frequency of super knock can not be reduced to an acceptable range only by real-time identification of the knock sensor and further measures, and the risk of damage of the super knock to the engine can not be eliminated.
Disclosure of Invention
The invention aims to provide a super-knock control system and a super-knock control method, which are used for predicting super-knock and taking measures to avoid the super-knock before the super-knock occurs.
In order to solve the above technical problem, the present invention provides a super knock control system, including: an engine controller and a powertrain domain controller;
the powertrain domain controller comprises an engine parameter prediction unit and a super knock prediction unit;
the engine parameter prediction unit is used for analyzing engine operation parameters of a plurality of working cycles before the nth working cycle to obtain an engine operation change trend, and predicting the engine operation parameters in a plurality of working cycles after the nth working cycle according to the engine operation parameters in the nth working cycle and the engine operation change trend;
the super knock prediction unit is used for calculating the probability of super knock in a plurality of working cycles after the nth working cycle according to the predicted engine operation parameters in the working cycles after the nth working cycle, and comparing the probability with a set threshold value to judge whether super knock is about to occur or not;
the engine controller is used for calculating engine operation parameters in each working cycle and taking measures to inhibit the occurrence of super knock when the super knock prediction unit predicts that the super knock will occur;
wherein n is a natural number and is more than or equal to 1.
Optionally, in the super knock control system, the engine controller and the powertrain domain controller perform information interaction in a controller local area network manner.
Optionally, in the super knock control system, the measures include: adjusting a target air-fuel ratio, adjusting a valve overlap angle, and/or adjusting a target water temperature.
Optionally, in the super knock control system, the super knock prediction unit calculates, by using a super knock model, a probability of occurrence of super knock in a plurality of work cycles after the nth work cycle.
Optionally, in the super knock control system, the super knock model is obtained by training a machine learning algorithm based on measured data of calibrated engine operating parameters of the engine or the vehicle.
Optionally, in the super knock control system, the engine operating parameters include: one or more of engine speed, engine intake load, engine intake temperature, engine intake valve opening phase, engine exhaust valve closing phase, and engine knock intensity.
The invention also provides a super knock control method, which comprises the following steps:
s1, calculating engine operation parameters of a plurality of working cycles before the nth working cycle, and analyzing the calculated result to obtain the variation trend of the engine operation parameters;
s2, predicting engine operation parameters in a plurality of working cycles after the nth working cycle according to the engine operation parameters in the nth working cycle and the variation trend of the engine operation parameters;
s3, calculating the probability of super knock in a plurality of working cycles after the nth working cycle according to the predicted engine operation parameters in the working cycles after the nth working cycle, and comparing the probability with a set threshold value to judge whether super knock is about to occur or not;
s4, if the set threshold is exceeded, taking measures to restrain the occurrence of super knock, if the set threshold is not exceeded, repeating the steps;
wherein n is a natural number and is more than or equal to 1.
Optionally, in the super knock control method, before step S2, the method further includes: an engine operating parameter is calculated in the nth operating cycle.
Optionally, in the super knock control method, the engine operating parameters include engine speed, engine intake load, engine intake temperature, engine intake valve opening phase, engine exhaust valve closing phase and engine knock intensity.
Optionally, in the super knock control method, the measures include: adjusting a target air-fuel ratio, adjusting a valve overlap angle, and/or adjusting a target water temperature.
In the super knock control system and the super knock control method, engine operation change trends are obtained by analyzing engine operation parameters of a plurality of working cycles before the nth working cycle, engine operation parameters in a plurality of working cycles after the nth working cycle are predicted according to the engine operation parameters in the nth working cycle and the engine operation change trends, then the probability of super knock occurrence in the plurality of working cycles after the nth working cycle is calculated according to the predicted engine operation parameters in the plurality of working cycles after the nth working cycle, the probability is compared with a set threshold value to judge whether super knock is about to occur, and if the probability exceeds the set threshold value, measures are taken to inhibit the super knock occurrence. Compared with the prior art, the super knock control system and the super knock control method provided by the invention have the advantages that the super knock is predicted and controlled in advance by taking measures before the super knock occurs, so that the super knock can be avoided.
Drawings
FIG. 1 is a block diagram of the components of a super-knock control system in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a super-knock control method according to an embodiment of the present invention;
wherein the reference numerals are as follows:
11-an engine controller; 12-powertrain domain controller; 121-an engine parameter prediction unit; 122-super knock prediction unit.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
First, as shown in fig. 1, an embodiment of the present invention provides a super knock control system including an engine controller 11 and a powertrain domain controller 12. The engine controller 11 and the powertrain domain controller 12 may perform information interaction in a controller area network manner.
The powertrain domain controller 12 comprises an engine parameter prediction unit 121 and a super knock prediction unit 122, wherein the engine parameter prediction unit 121 is configured to analyze engine operation parameters of a plurality of working cycles before an nth working cycle to obtain an engine operation variation trend, and predict engine operation parameters of a plurality of working cycles after the nth working cycle according to the engine operation parameters of the nth working cycle and the engine operation variation trend; the super knock prediction unit 122 is configured to calculate, according to the engine operating parameters in a plurality of predicted work cycles after the nth work cycle, a probability of super knock occurring in the plurality of work cycles after the nth work cycle, and compare the probability with a set threshold to determine whether super knock is about to occur; the engine controller 11 is configured to calculate engine operating parameters in each working cycle, and take measures to suppress occurrence of super knock when the super knock prediction unit 122 predicts that super knock will occur; n is a natural number and is more than or equal to 1.
Specifically, the super knock prediction unit 122 may calculate, through a super knock model, a probability of super knock occurring in a plurality of operation cycles after the nth operation cycle. The super knock model can be obtained by training through a machine learning algorithm such as a neural network algorithm based on measured data of calibrated engine operating parameters of the engine or the vehicle, and can be obtained by online training of different states of each individual vehicle or vehicle by combining super knock intensity obtained by measuring the super knock intensity actually by a knock sensor because the super knock occurs stochastically and is shown differently in different vehicles or different state stages of the vehicles.
Correspondingly, the embodiment of the invention also provides a super knock control method, which comprises the following steps:
s1, calculating engine operation parameters of a plurality of working cycles before the nth working cycle, and analyzing the calculated result to obtain the variation trend of the engine operation parameters;
s2, predicting engine operation parameters in a plurality of working cycles after the nth working cycle according to the engine operation parameters in the nth working cycle and the variation trend of the engine operation parameters;
s3, calculating the probability of super knock in a plurality of working cycles after the nth working cycle according to the predicted engine operation parameters in the working cycles after the nth working cycle, and comparing the probability with a set threshold value to judge whether super knock is about to occur or not;
s4, if the set threshold is exceeded, taking measures to restrain the occurrence of super knock, if the set threshold is not exceeded, repeating the steps;
wherein n is a natural number and is more than or equal to 1.
Before step S2, the super knock control method according to the embodiment of the present invention may further include: an engine operating parameter is calculated in the nth operating cycle.
In the super knock control system and the super knock control method provided by the embodiment of the invention, the engine operation parameters comprise one or more of engine speed, engine intake load, engine intake temperature, engine intake valve opening phase, engine exhaust valve closing phase and engine knock intensity; after the super knock is predicted to occur soon, the measures that can be taken include: adjusting a target air-fuel ratio, adjusting a valve overlap angle, and/or adjusting a target water temperature. By means of active control, the frequency of occurrence of super knocking is greatly reduced, and the influence of the measures on drivability is smaller than that of the measures after the super knocking is identified through the knock sensor.
In summary, the super knock control system and the super knock control method provided by the invention realize that the super knock is predicted and measures are taken in advance for control before the super knock occurs, so that the super knock can be avoided.
Claims (10)
1. A super knock control system, comprising: an engine controller and a powertrain domain controller;
the powertrain domain controller comprises an engine parameter prediction unit and a super knock prediction unit;
the engine parameter prediction unit is used for analyzing engine operation parameters of a plurality of working cycles before the nth working cycle to obtain an engine operation change trend, and predicting the engine operation parameters in a plurality of working cycles after the nth working cycle according to the engine operation parameters in the nth working cycle and the engine operation change trend;
the super knock prediction unit is used for calculating the probability of super knock in a plurality of working cycles after the nth working cycle according to the predicted engine operation parameters in the working cycles after the nth working cycle, and comparing the probability with a set threshold value to judge whether super knock is about to occur or not;
the engine controller is used for calculating engine operation parameters in each working cycle and taking measures to inhibit the occurrence of super knock when the super knock prediction unit predicts that the super knock will occur;
wherein n is a natural number and is more than or equal to 1.
2. The super knock control system according to claim 1, wherein said engine controller and powertrain domain controller communicate information by way of a controller area network.
3. The super knock control system according to claim 1, wherein said means comprises: adjusting a target air-fuel ratio, adjusting a valve overlap angle, and/or adjusting a target water temperature.
4. The super-knock control system according to claim 1, wherein the super-knock prediction unit calculates a probability of occurrence of super-knock in a plurality of operation cycles after the nth operation cycle by a super-knock model.
5. The super-knock control system according to claim 4, wherein said super-knock model is trained by a machine learning algorithm based on measured data of calibrated engine operating parameters of the engine or vehicle.
6. The super knock control system according to any one of claims 1 to 5, wherein said engine operating parameters include: one or more of engine speed, engine intake load, engine intake temperature, engine intake valve opening phase, engine exhaust valve closing phase, and engine knock intensity.
7. A super knock control method, comprising:
s1, calculating engine operation parameters of a plurality of working cycles before the nth working cycle, and analyzing the calculated result to obtain the variation trend of the engine operation parameters;
s2, predicting engine operation parameters in a plurality of working cycles after the nth working cycle according to the engine operation parameters in the nth working cycle and the variation trend of the engine operation parameters;
s3, calculating the probability of super knock in a plurality of working cycles after the nth working cycle according to the predicted engine operation parameters in the working cycles after the nth working cycle, and comparing the probability with a set threshold value to judge whether super knock is about to occur or not;
s4, if the set threshold is exceeded, taking measures to restrain the occurrence of super knock, if the set threshold is not exceeded, repeating the steps;
wherein n is a natural number and is more than or equal to 1.
8. The super knock control method according to claim 7, further comprising, before step S2: an engine operating parameter is calculated in the nth operating cycle.
9. The super-knock control method of claim 7 wherein said engine operating parameters include engine speed, engine intake load, engine intake temperature, engine intake valve opening phase, engine exhaust valve closing phase and engine knock intensity.
10. The super knock control method according to claim 7, wherein said measures include: adjusting a target air-fuel ratio, adjusting a valve overlap angle, and/or adjusting a target water temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010844688.7A CN111980821A (en) | 2020-08-20 | 2020-08-20 | Super knock control system and method |
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| CN202010844688.7A CN111980821A (en) | 2020-08-20 | 2020-08-20 | Super knock control system and method |
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| JP2018184862A (en) * | 2017-04-25 | 2018-11-22 | 日立オートモティブシステムズ株式会社 | Ignition control device of internal combustion engine |
| JP2018197514A (en) * | 2017-05-23 | 2018-12-13 | トヨタ自動車株式会社 | Control system of internal combustion engine and control system of internal combustion engine |
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2020
- 2020-08-20 CN CN202010844688.7A patent/CN111980821A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4658789A (en) * | 1985-01-31 | 1987-04-21 | Nissan Motor Company, Limited | Ignition timing control system and method for an internal combustion engine |
| JP2008075633A (en) * | 2006-09-25 | 2008-04-03 | Toyota Motor Corp | Combustion control device for internal combustion engine |
| CN102345536A (en) * | 2010-07-29 | 2012-02-08 | 福特环球技术公司 | Engine system and running method thereof |
| CN102817761A (en) * | 2011-06-10 | 2012-12-12 | 镇江润欣科技信息有限公司 | Method for restraining engine knock |
| JP2016109016A (en) * | 2014-12-05 | 2016-06-20 | マツダ株式会社 | Engine control device |
| DE102016224643A1 (en) * | 2016-12-09 | 2017-07-27 | Mtu Friedrichshafen Gmbh | Method for operating an internal combustion engine and internal combustion engine |
| CN106640396A (en) * | 2016-12-16 | 2017-05-10 | 天津大学 | Super knock restraining method based on multi-parameter adjustment and control |
| JP2018184862A (en) * | 2017-04-25 | 2018-11-22 | 日立オートモティブシステムズ株式会社 | Ignition control device of internal combustion engine |
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