KR101791755B1 - Method for warning carbon deposition of engine - Google Patents
Method for warning carbon deposition of engine Download PDFInfo
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- KR101791755B1 KR101791755B1 KR1020150186012A KR20150186012A KR101791755B1 KR 101791755 B1 KR101791755 B1 KR 101791755B1 KR 1020150186012 A KR1020150186012 A KR 1020150186012A KR 20150186012 A KR20150186012 A KR 20150186012A KR 101791755 B1 KR101791755 B1 KR 101791755B1
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- South Korea
- Prior art keywords
- average value
- knock signal
- knock
- signal average
- determination step
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
- F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
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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
- F02D2041/228—Warning displays
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/025—Engine noise, e.g. determined by using an acoustic sensor
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a carbon accumulation warning method of an engine, which includes a knock signal average value increase determination step (S30), a knock occurrence number increase determination step (S40), and a carbon accumulation warning step (S50). If the knock signal average value and the number of knock occurrences exceed the set value, a carbon accumulation warning signal is generated so that the carbon cleaning operation can be performed in a timely manner.
Description
The present invention relates to a carbon accumulation warning method for an engine, and more particularly, to a carbon accumulation warning method for an engine which can detect carbon accumulation by using a knock signal and warn carbon accumulation in time to perform carbon cleaning .
The engine of the vehicle sucks in air and burns it together with the fuel to produce the driving energy of the vehicle.
Carbon (C) contained in the fine dust, the combustion gas and the recirculated exhaust gas sucked together with the air in the intake system of the engine or the combustion chamber of the engine, and the droplets of the fuel injected excessively at the time of cold start are accumulated over time.
This accumulation of carbon makes it impossible to precisely control the intake air amount and the fuel injection amount, so that the air-fuel ratio control is not accurately performed, causing problems such as a decrease in the output of the engine, a large amount of harmful exhaust gas generation and knocking (knocking) do.
Therefore, the carbonaceous material is washed and removed to prevent excessive accumulation of carbon.
Such a technique for cleaning carbon is disclosed in Korean Patent Laid-Open No. 10-2005-0066310.
On the other hand, the knock of the engine is caused by various causes. When the knock occurs, the driver is discomforted by the vibration and the noise, and the durability of the engine is deteriorated if it continues for a long period of time.
Therefore, the knock sensor is installed in the engine to detect the occurrence of the knock, and the knocking is prevented by ignoring the ignition timing when the knock occurs.
The engine control unit of the vehicle senses the occurrence of the knock using the knock signal generated by the knock sensor as described above.
The knock signal is continuously input to the engine control unit during engine operation. The engine control unit calculates a knock signal average value in order to consider the noise included in the knock signal and the engine characteristics, and determines a threshold by following the average value. After the knock signal exceeds the threshold, .
However, carbon accumulates in the combustion chamber as described above as the use period of the engine increases. When the accumulation amount of carbon increases, the number of knock occurrences increases.
As the number of occurrences of knock increases, the average value of the knock signal naturally increases, and the threshold determined by following the average value of the knock signal is increased.
Therefore, even if a knock that can be judged as a knock in a steady state in which no carbon is accumulated occurs, that is, even if a knock actually occurs, a phenomenon that the knock is not judged by the rise of the threshold occurs. In other words, since the sensitivity of the knocking detection is slowed, the ignition timing control for preventing the knocking is not performed, and the knocking is continuously generated more frequently, so that the discomfort felt by the driver is increased and the running progress of the engine is accelerated.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a fuel cell system capable of preventing carbon buildup by preventing carbon accumulation, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a carbon accumulation warning method for an engine.
According to an aspect of the present invention, there is provided a method for controlling a knock signal, the method comprising the steps of: monitoring a knock signal transmitted from a knock sensor (S10); calculating a knock signal average value (S20) A knock signal average value rise determination step (S30) of determining whether the calculated knock signal average value has risen above a set value relative to the initial state, and a knock signal average value increase determination step (S30), wherein the number of knock occurrences during the monitoring time of the knock signal used for calculating the knock signal average value The average knock signal value and the number of knock occurrences are respectively set in the knock occurrence number increase determination step S40 and the step S30 to determine whether the knock signal has been increased more than the set value, Which causes a warning to the driver of the carbon accumulation warning This accumulation warning step (S50) is included.
The first knock signal average value reliability determination step of comparing the calculated knock signal average value with the knock signal average value during the most recent driving cycle progress time and recognizing the reliability of the knock signal average value when the difference is within a set value (S32).
The present invention further includes a second knock signal average value reliability determination step (S34) of determining whether the calculated knock signal average value has risen above a set value with respect to the vehicle traveling distance and ascertaining the reliability of the knock signal average value .
The present invention is characterized in that the knock signal average value rise step S30 determines that the knock signal average value does not rise more than the initial state contrast set value or the knock occurrence number increase step S40 Or the difference between the knock signal average value and the preset knock signal average value during the latest driving cycle progress time of the set number of times is not within the set value in the first knock signal average value reliability determination step S32, If the knock signal average value does not rise above the set value on the basis of the travel distance in step S34, the existing control state is maintained without performing the carbon accumulation warning step S50 (S60).
In the carbon accumulation warning step (S50), when the mechanic connects the scanner to the engine control unit, the average value of the knock signal and the number of knock occurrences are numerically displayed on the scanner.
As described above, according to the present invention, if the degree of increase of the knock signal average value and the knock occurrence frequency is significant, it is determined that the cause of the increase is due to carbon accumulation, and the driver can be warned that the carbon accumulation state is present.
Therefore, the carbon cleaning operation can always be carried out at an appropriate time, whereby excessive accumulation of carbon is prevented, and the combustion control of the engine can be normally performed.
In addition, it is possible to prevent the occurrence of knock due to carbon accumulation, thereby preventing a decrease in durability of the engine due to frequent knocking.
1 is a flowchart showing a first embodiment of a carbon accumulation warning method for an engine according to the present invention.
2 is a flowchart showing a second embodiment of a carbon accumulation warning method for an engine according to the present invention.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.
In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flowchart of a carbon accumulation warning method for an engine according to the present invention. The carbon accumulation warning method of an engine according to the present invention includes a knock signal monitoring step S10, a knock signal average value calculation step S20, A determination step S30, a knock occurrence number increase determination step S40, and a carbon accumulation warning step S50.
When the vehicle starts to run and the control start condition is satisfied, the knock signal monitoring step S10 is performed. In this step, all the knock signals transmitted from the knock sensors installed in the engine cylinder block are monitored.
The application of the control start condition is intended to obtain a reliable knock signal by allowing the control according to the present invention to be performed under a certain condition in which the engine operation is stabilized. Examples of the control start conditions include an engine rotation speed of 2000 rpm, an air amount of 60%, an intake air temperature of 40 degrees, a cooling water temperature of 90 degrees, a cam angle target tracking state normal, and a holding time of 3 seconds.
The knock signal average value calculation step S20 calculates an average value of knock signals transmitted from the knock sensor. The knock signal average value is a sum of knock signal values / knock signal counts for a set time (e.g., 2 seconds) As shown in Fig.
The knock signal average value rise determination step S30 may further include determining whether the knock signal average value obtained in the step S20 is 5% or less as compared with an initial state (a state in which carbon is not accumulated at the time of initial purchase of a car or a carbon cleaning operation) Is a set arbitrary set value) or more.
That is, it is determined whether the knock signal average value has increased to a meaningful extent as compared with the initial state in which no carbon is accumulated.
If it is determined in step S30 that the knock signal average value has significantly increased, the knock occurrence number increase determination step S40 is performed. Otherwise, if the knock signal average value is insignificant, the existing control is maintained. Control maintenance step S60). Here, the conventional control means general engine control except for the control according to the present invention.
In the step of determining whether the number of knockings has been increased (S40), whether the number of knock occurrences during the knock signal monitoring time used to calculate the knock signal average value (i.e., the set time) has increased by 10% If the number of occurrences of knock increases by 10% or more from the initial state, it is determined that the increase is significant.
In this step S40, if it is determined that the number of knock occurrences does not increase by more than 10% with respect to the initial state and the degree of increase is not meaningful, the existing control holding step S60 is performed as in the previous step S30.
If the average value of the knock signal and the number of knock occurrences increase by more than the set value through the knock signal average value increase judgment step S30 and the knock occurrence number increase judgment step S40 all have a significant upward tendency, The carbon accumulation warning step (S50) is performed.
The carbon accumulation warning step (S50) alerts the driver of the accumulation of carbon in various ways, for example, flashing a warning light such as a dashboard in a viewable position for the driver.
In addition, if the mechanic connects the scanner to the engine control unit (ECU) in step S50, the knock signal average value, the number of knock occurrences, and the like can be displayed as numerical values. Therefore, the mechanic will be able to gauge how much carbon has accumulated and can be used to clean the carbon.
Meanwhile, as shown in FIG. 2, the carbon accumulation warning method according to the present invention includes a first knock signal average value reliability determination step S32 (see FIG. 2) so that the carbon accumulation warning according to the present invention can be accurately performed by verifying the reliability of the knock signal average value. ) And a second knock signal average value reliability determination step (S34).
The first knock signal average value reliability determination step S32 and the second knock signal average value reliability determination step S34 are sequentially performed after the knock signal average value rise determination step S30.
However, the two steps S32 and S34 may be performed immediately after the knock signal average value calculation step S20 since it is to determine the reliability of the knock signal average value calculated recently.
The first knock signal average value reliability determination step S32 compares the knock signal average value calculated in the previous step S20 with the knock signal average value during the driving cycle of the last 20 times (arbitrary set value) 0.5% (arbitrary set value).
As a result of comparison, if the difference is within 0.5%, it is confirmed that the average value of the knock signals obtained for use in the control logic of the present invention does not greatly differ from the average value of the recent knock signals, so that it is a reliable value including no abnormal knock signals .
If the difference exceeds 0.5%, it is determined that the knock signal average value calculated in the knock signal average value calculation step (S20) is an unreliable value influenced by an abnormal knock signal due to an unknown cause, and the carbon accumulation warning (S60).
The second knock signal average value reliability determination step S34 determines whether the knock signal average value obtained in the knock signal average value calculation step S20 is valid with respect to the vehicle running distance. If the calculated knock signal average value is less than a reference running distance , It is determined that the calculated average value of the knock signal is reliable and the subsequent step (the step of judging the increase in the number of times of knocking increase S40) is carried out, and 0.1 %, It is determined that the calculated knock signal average value is lowered in reliability, and the control for maintaining the carbon accumulation warning is not advanced any more and the existing control is maintained (S60).
The reliability of the knock signal average value calculated in the knock signal average value calculation step (S20) through the first knock signal average value reliability determination step (S32) and the second knock signal average value reliability determination step (S34) The reliability of the carbon accumulation warning signal according to the invention control logic is also improved. That is, since the carbon accumulation state is determined using the calculated reliability value, it is possible to prevent the carbon accumulation state from being misplaced.
Therefore, a false carbon accumulation warning signal is not generated, and it is possible to prevent an unnecessary carbon cleaning operation from being performed due to a wrong carbon accumulation warning signal.
As described above, according to the present invention, if the increase degree of the knock signal average value and the knock occurrence frequency is significant, it is determined that the cause of the increase is due to the carbon accumulation, and the driver can be warned that the carbon accumulation state is present.
Therefore, the carbon cleaning operation can always be carried out at an appropriate time, whereby excessive accumulation of carbon is prevented, and the combustion control of the engine can be normally performed.
In addition, it is possible to prevent the occurrence of knock due to carbon accumulation, thereby preventing a decrease in durability of the engine due to frequent knocking.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.
Claims (5)
A knock signal average value calculation step (S20) of calculating an average value of the knock signal;
A knock signal average value rise determination step (S30) for determining whether the calculated knock signal average value has risen above the initial state comparison set value;
A knock occurrence number increase determination step (S40) for determining whether the number of knock occurrences occurring during the monitoring time of the knock signal used for calculating the knock signal average value has increased by more than a set value with respect to the initial state; And
A carbon accumulation warning step of generating a carbon accumulation warning signal to the driver when the knock signal average value and the knock occurrence count increase to more than respective set values in the knock signal average value rise determination step S30 and the knock generation number increase determination step S40, (S50)
A first knock signal average value reliability determination step (S32) of comparing the calculated knock signal average value with a knock signal average value during a recent driving cycle progress time when the difference is within a predetermined value, and recognizing the reliability of the knock signal average value; Further comprising the steps of:
And a second knock signal average value reliability determination step (S34) of determining whether the calculated knock signal average value has risen above a set value with respect to the vehicle running distance and ascertaining the reliability of the knock signal average value if the knock signal average value has risen above a set value Characterized in that the carbon accumulation warning method of the engine.
If it is determined in step S30 that the knock signal average value does not rise above the initial state contrast set value,
If it is determined in step S40 that the number of occurrences of knocking has not increased more than the set value of the initial state,
In the first knock signal average value reliability determination step S32, if the difference between the knock signal average value and the set knock signal average value during the latest driving cycle progress time does not fall within the set value,
If the knock signal average value does not rise above the set value on the basis of the travel distance in the second knock signal average value reliability determination step (S34)
The carbon accumulation warning step (S50) is not performed but the existing control state is maintained (S60).
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| KR1020150186012A KR101791755B1 (en) | 2015-12-24 | 2015-12-24 | Method for warning carbon deposition of engine |
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| KR1020150186012A KR101791755B1 (en) | 2015-12-24 | 2015-12-24 | Method for warning carbon deposition of engine |
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| KR20170076132A KR20170076132A (en) | 2017-07-04 |
| KR101791755B1 true KR101791755B1 (en) | 2017-11-20 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226481A (en) * | 2004-02-10 | 2005-08-25 | Nissan Motor Co Ltd | Deposit quantity detection device and knocking control device for engine |
| JP2013044258A (en) * | 2011-08-23 | 2013-03-04 | Toyota Motor Corp | Control device of internal combustion engine |
| JP2014098314A (en) * | 2012-11-13 | 2014-05-29 | Suzuki Motor Corp | Intake air abnormality diagnostic device |
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- 2015-12-24 KR KR1020150186012A patent/KR101791755B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226481A (en) * | 2004-02-10 | 2005-08-25 | Nissan Motor Co Ltd | Deposit quantity detection device and knocking control device for engine |
| JP2013044258A (en) * | 2011-08-23 | 2013-03-04 | Toyota Motor Corp | Control device of internal combustion engine |
| JP2014098314A (en) * | 2012-11-13 | 2014-05-29 | Suzuki Motor Corp | Intake air abnormality diagnostic device |
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