CN115217647A - Control method of exhaust gas recirculation valve - Google Patents
Control method of exhaust gas recirculation valve Download PDFInfo
- Publication number
- CN115217647A CN115217647A CN202111315022.3A CN202111315022A CN115217647A CN 115217647 A CN115217647 A CN 115217647A CN 202111315022 A CN202111315022 A CN 202111315022A CN 115217647 A CN115217647 A CN 115217647A
- Authority
- CN
- China
- Prior art keywords
- egr valve
- self
- valve
- full
- dead center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004140 cleaning Methods 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000007257 malfunction Effects 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 230000008021 deposition Effects 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 7
- 230000004913 activation Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2438—Active learning methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
-
- 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 discloses a control method of an exhaust gas recirculation valve, which comprises the following steps: sending PWM waves with different duty ratios to control the EGR valve to perform full-closing and full-opening actions, so that the EGR valve generates vibration; judging whether the full opening and full closing actions reach the set times, if so, ending the self-cleaning mode, and entering a self-learning mode; and in the self-learning mode, sending PWM waves with different duty ratios to control the EGR valve to perform full-closing and full-opening actions, judging whether the error between the upper dead point position and the lower dead point position of the EGR valve obtained in the self-learning process and the preset upper dead point and lower dead point position exceeds a preset error range, and if not, ending the self-learning mode. The self-cleaning mode can prevent carbon deposition accumulation, the stuck state is removed when the valve is stuck, and meanwhile, the EGR valve self-learning mode is introduced, so that the positions of the upper dead point and the lower dead point of the EGR valve read by the ECU are always matched with the position of an actual dead point, and the control precision of the EGR valve is further ensured.
Description
Technical Field
The invention relates to the technical field of EGR valves, in particular to a control method of an exhaust gas recirculation valve.
Background
With the tightening of fuel consumption and emission regulations, more and more gasoline engine models on the market begin to adopt Exhaust Gas Recirculation (EGR) technology, and on one hand, when the engine speed is low and the load is high, the recirculated exhaust gas is introduced to reduce the combustion temperature so as to avoid knocking. After the recirculated waste gas is introduced to reduce the combustion temperature, the ignition advance angle can be advanced, which is beneficial to the power exertion and the oil consumption reduction. On the other hand, at higher speeds, the introduction of recirculated exhaust gas eliminates the need for over-injection to maintain the exhaust temperature below the desired 950 ℃.
In the EGR scheme, a pneumatic EGR valve is usually adopted, or even an electronic EGR valve is adopted, the EGR valve has no self-learning or self-cleaning function, a certain amount of carbon deposit can be accumulated on an EGR valve seat along with the prolonging of the service time, the upper dead point and the lower dead point position and a new part deviate to a certain degree, the control precision of the EGR rate is influenced, the EGR valve is possibly blocked in serious conditions, and the combustion is unstable and flameout is finally caused.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling an egr valve, which can prevent carbon deposition from accumulating and remove a stuck state when a valve is stuck; meanwhile, the EGR valve self-learning function is introduced, so that the positions of the upper dead point and the lower dead point of the EGR valve read by an ECU of the engine are always matched with the position of the actual dead point, and the control precision of the EGR rate is ensured.
The invention provides an exhaust gas recirculation valve control method, which comprises the following steps: sending PWM waves with different duty ratios to control the EGR valve to carry out full-closing and full-opening actions, so that the EGR valve generates vibration; judging whether the full-on and full-off actions reach the set times, if so, ending the self-cleaning mode, and entering a self-learning mode; and in the self-learning mode, sending PWM waves with different duty ratios to control the EGR valve to perform full-closing and full-opening actions, judging whether the error between the upper dead point position and the lower dead point position of the EGR valve obtained in the self-learning process and the preset upper dead point and lower dead point position exceeds a preset error range, and if not, ending the self-learning mode.
Further comprising: detecting the power-off state and the power-off duration of the whole vehicle; and when the whole vehicle is in a power-off state and the power-off duration reaches the preset duration, starting a self-cleaning mode.
Further comprising: monitoring the speed of the whole vehicle, the voltage of a battery, the ambient temperature and the rotating speed of an engine; and when the speed of the whole vehicle, the voltage of the battery, the ambient temperature and the rotating speed of the engine are all in corresponding preset ranges, entering a self-cleaning mode.
Further, the control method of the self-cleaning mode includes: applying 100% PWM wave to the motor of the EGR valve to open the EGR valve from the full-close position to the full-open position; when the EGR valve reaches the full-open position, a first positive duty ratio PWM wave is applied to a motor of the EGR valve so as to crush foreign matters in the valve seat; applying a PWM wave of-100% to a motor of the EGR valve to enable the EGR valve to be from a fully open position to a fully closed position; when the EGR valve reaches the full-closed position, a first PWM wave with a reverse duty ratio is applied to a motor of the EGR valve so as to crush foreign matters in the valve seat; the step of applying a 100% PWM wave to the motor of the EGR valve to open the EGR valve from the fully closed position to the fully open position further comprises: judging whether the opening degree of the EGR valve reaches 90%; and if the opening degree of the EGR valve reaches 90%, starting a soft landing strategy.
Further, the step of applying a-100% PWM wave to the motor of the EGR valve to move the EGR valve from the fully open position to the fully closed position further comprises: judging whether the opening degree of the EGR valve reaches 10%; and if the opening degree of the EGR valve reaches 10%, starting a soft landing strategy.
Further, under the soft landing strategy, the rotation speed of the valve plate is less than 50 degrees/s or the output voltage of the position sensor is less than 2.2V/s.
Further, the control method of the self-learning mode comprises the following steps: applying a second reverse duty ratio PWM wave to a motor of the EGR valve, obtaining a position signal of the bottom dead center, maintaining for a certain time, obtaining a plurality of stable numerical values of the signal in the time period, and obtaining an average value of the position of the bottom dead center; applying 100% PWM wave to the EGR valve to enable the EGR valve to move from a bottom dead center to a top dead center, maintaining for a certain time after the ERG valve reaches the top dead center, obtaining a plurality of stable numerical values of signals in the time period, and obtaining the average value of the top dead center position; and judging whether the error between the obtained average value of the positions of the upper dead point and the lower dead point of the EGR valve and the preset position of the upper dead point and the lower dead point exceeds a preset error range, and if not, ending the self-learning mode.
Further, after the ERG valve reaches the top dead center, the method further comprises: applying a positive third duty ratio PWM wave to the EGR valve for a preset time to press out foreign matters in the valve seat; and then, applying a forward fourth duty ratio PWM wave to the EGR valve for a preset time duration to obtain a plurality of stable signal values in the time period, and calculating the average value of the top dead center position.
Further, the amplitude of the first duty ratio PWM wave is larger than the amplitude of the second duty ratio PWM wave, and the amplitude of the third duty ratio PWM wave is larger than the amplitude of the first duty ratio PWM wave and the amplitude of the fourth duty ratio PWM wave.
Further, if the error between the obtained average value of the positions of the upper dead center and the lower dead center of the EGR valve and the preset error range exceeds the preset error range, the self-cleaning mode is repeated for the set times, the average value of the positions of the upper dead center and the lower dead center is re-solved in the self-learning mode, and if the error between the obtained average value of the positions of the upper dead center and the preset position of the lower dead center still exceeds the preset error range, a fault is prompted.
Compared with the prior art, the invention has the following beneficial technical effects:
in the self-cleaning mode, the EGR valve is enabled to carry out full-closing action and full-opening action to generate vibration by utilizing an adjusting mode that an ECU of an engine applies PWM waves with different duty ratios to two ends of a motor of the EGR valve, carbon deposition in the EGR valve is cleaned, carbon deposition accumulation is prevented, and the stuck state can be removed when the valve is stuck; meanwhile, an EGR valve self-learning mode is introduced, PWM waves with different duty ratios are sent by an ECU of the engine to control the EGR valve to perform full-closing action and full-opening action, the ECU reads the positions of the upper dead point and the lower dead point of the EGR valve and judges whether the positions are matched with the positions of the actual dead points or not, and therefore the control accuracy of the EGR valve is guaranteed.
Drawings
FIG. 1 is a flow chart of the EGR valve self-learning and self-cleaning modes of the present invention;
FIG. 2 is a schematic diagram illustrating a comparison between an actual opening degree and a corresponding preset opening degree of a valve plate in a self-learning and self-cleaning mode of an EGR valve according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, in the method for controlling an exhaust gas recirculation valve according to the present invention, PWM waves with different duty ratios are sent to control an EGR valve to perform full-on and full-off operations, so that the EGR valve generates vibration; judging whether the full-on and full-off actions reach the set times, if so, ending the self-cleaning mode, and entering a self-learning mode; and in the self-learning mode, sending PWM waves with different duty ratios to control the EGR valve to perform full-closing and full-opening actions, judging whether the error between the upper dead point position and the lower dead point position of the EGR valve obtained in the self-learning process and the preset upper dead point and lower dead point position exceeds a preset error range, and if not, ending the self-learning mode.
Specifically, an ECU of the engine sets an activation condition and an entry condition of an EGR valve for a self-cleaning mode, when the activation condition and the entry condition are met, the self-cleaning mode is started or entered, the activation condition and the entry condition comprise a power-off state of the whole vehicle, a power-off duration, a vehicle speed, a battery voltage, an ambient temperature, an engine rotating speed and the like, when the whole vehicle is in the power-off state and the power-off duration reaches a preset value, the self-cleaning mode is activated, and after the self-cleaning mode is activated, if the vehicle speed, the battery voltage, the ambient temperature and the engine rotating speed are all in corresponding preset ranges, the EGR valve formally enters the self-cleaning mode.
Specifically, whether the whole vehicle is in a power-off state or not is judged, the power-off time of the whole vehicle is recorded, and if the whole vehicle is in the power-off state and the power-off time reaches a preset time t1, the self-cleaning mode of the EGR valve is started. In the present embodiment, the time period threshold t1 is 2 to 3 seconds. And if the whole vehicle is not in a power-off state or the power-off time does not reach the preset time t1, the EGR valve does not start the self-cleaning mode. It should be noted that the judgment of the power-off state and the power-off duration of the whole vehicle is performed to prevent frequent enabling under the key playing condition.
Further, after the self-cleaning mode is activated, it is necessary to further read the relevant conditions of the vehicle speed, the battery voltage, the ambient temperature, the engine speed, and the like, and determine whether the vehicle speed, the battery voltage, the ambient temperature, and the engine speed are all within the corresponding preset ranges, in this embodiment, when the vehicle speed is less than a preset vehicle speed V1, the battery voltage is within a preset voltage U1-U2 range, the ambient temperature is within a preset ambient temperature T1-T2 range, and the engine speed is less than a preset speed N1, the EGR valve formally enters the self-cleaning mode, specifically, the preset vehicle speed V1 is 10km/h, the preset voltage U1-U2 is 9-10V, the preset ambient temperature T1-T2 is 0-45 ℃, and the preset speed N1 is 250r/min. If at least one of the vehicle speed, the battery voltage, the ambient temperature and the engine speed is not within a preset range, the EGR valve does not enter the self-cleaning mode. The vehicle speed condition is set to ensure that the whole vehicle is in a safe state when a self-learning mode is entered later, the battery voltage condition is set to ensure that the EGR valve is not in a forbidden enabling state such as power shortage, the environment temperature condition is set to ensure that a position sensor in the EGR valve is in a good working state, the full opening action and the full closing action can be accurately carried out when the self-cleaning mode is carried out, and the engine rotating speed condition is set because the self-cleaning mode does not damage the EGR valve and the engine when the rotating speed is low.
Further, after the EGR valve enters the self-cleaning mode, the operation is carried out according to the following steps:
s1, firstly, applying 100% PWM (pulse-width modulation) waves to two ends of a motor of an EGR valve to enable the EGR valve to be rapidly opened from a fully closed position to a fully opened position, and avoiding the situations of damage of a valve plate, a transmission gear train, abnormal abrasion of a valve seat and the like, wherein in the process, whether the opening degree of a valve plate reaches 90% or not needs to be judged, if the opening degree of the valve plate reaches 90%, a soft landing strategy needs to be started, namely the rotating speed of the valve plate is reduced to below 50 DEG/S (equivalent to the output voltage of a position sensor is limited to below 2.2V/S), if the opening degree of the valve plate does not reach 90%, the waiting is continued until the opening degree of the valve plate reaches 90%, then whether the EGR valve reaches a maximum opening position (namely a top dead center) is judged, if the EGR valve reaches the top dead center, the soft landing strategy is closed, and if the EGR valve does not reach the top dead center, the soft landing strategy is continued until the EGR valve reaches the maximum opening position;
s2, if the EGR valve reaches the maximum opening position, applying 30% PWM waves to two ends of a motor of the EGR valve to assist a spring to push the valve to open and crush foreign matters (such as carbon deposition) in a valve seat as much as possible, wherein in order to ensure the effectiveness of full opening action, the full opening position needs to be continued for a time period t2, and in the embodiment, the time period t2 is 500-700ms;
s3, then stepping a PWM wave applied to two ends of a motor of the EGR valve from 30% to-100%, judging whether the valve plate opening of the EGR valve reaches 10% opening, if so, starting a soft landing strategy, reducing the valve plate rotating speed to be below 50 °/S (equivalent to the limit of the output voltage of a position sensor to be below 2.2V/S), if not, continuing to wait until the valve plate opening of the EGR valve reaches 10%, then judging whether the valve plate is at the lowest position (bottom dead center), if so, carrying out the next step, and if not, continuing to carry out the soft landing strategy until the EGR valve reaches the bottom dead center, wherein in order to ensure the effectiveness of the full-closing action, the position lasts for a time period t3, in the embodiment, the t3 is 200-300ms;
s4, then repeating the steps S1-S3, judging whether the repeated operation times reach the preset times, if not, continuing to perform until the preset times are reached, if so, performing the next operation, and because the EGR valve is at the lowest position (namely the bottom dead center), applying a PWM wave of-30% to the EGR valve to assist the spring to push the valve to close and crush foreign matters (such as carbon deposition) in the valve seat as much as possible, maintaining the position for a time period t4, and ensuring that the self-cleaning mode enters a self-learning mode after the self-cleaning mode is ended, wherein in the embodiment, the preset times are 5 times, and t4 is 1600ms.
After entering the self-learning mode, the operation is carried out according to the following steps:
s5, firstly applying a-10% PWM wave to the EGR valve, acquiring a position signal of a closed position (namely a bottom dead center), maintaining a time t5 at the position in order to ensure the accuracy of the position signal, acquiring 5 stable values of the signal within the time t5, and calculating an average value Uclosed, wherein in the embodiment, t5 is 52ms;
s6, then applying 100% of PWM (pulse-width modulation) waves to the EGR valve, then judging whether the opening degree of the valve plate reaches 90% or not, if not, continuing to wait until the opening degree of the valve plate reaches 90%, if the opening degree of the valve plate reaches 90% of the opening degree, starting a soft landing strategy, similarly avoiding the occurrence of the conditions of damage of a valve plate, a transmission gear train, abnormal abrasion of a valve seat and the like, and after the EGR valve reaches a maximum opening position (namely a top dead center), applying 70% of PWM to the EGR valve for a duration t6 to extrude ash/carbon black, wherein in the embodiment, t6 is 800-1000ms; then loading 40% PWM wave to the EGR valve, obtaining a position signal of a full-open position, maintaining a time length t7 at the position in order to ensure the accuracy of the value, obtaining 5 stable values of the signal within the time t7, and calculating an average value Uopen, wherein in the embodiment, t7 is 52ms;
s7, judging whether the error between the closed or open and the preset closed and open exceeds a preset error range, if not, indicating that the upper and lower dead center positions of the EGR valve read by the ECU are matched with the actual dead center positions, if the error exceeds the set error range, repeating the steps S1-S3 in the self-cleaning mode until the set repetition number is reached, in the embodiment, the set repetition number is 3, after the step S1-S3 in the self-cleaning mode is finished, re-entering the steps S5-S6 in the self-learning mode, re-reading the value of the closed or open, and if not, prompting the fault.
And finally, when the opening degree of the valve plate reaches 50%, the motor of the EGR valve is powered off and enters a free closing state until the valve is completely closed. The EGR valve entire self-cleaning mode and self-learning mode are ended.
Through the above description, in the self-cleaning mode, the EGR valve performs full-closing action and full-opening action to generate vibration by applying PWM waves with different duty ratios to two ends of the motor of the EGR valve through the ECU of the engine, so that carbon deposition in the EGR valve is cleaned, the carbon deposition accumulation is prevented, and the stuck state can be removed when the valve is stuck; meanwhile, an EGR valve self-learning mode is introduced, PWM waves with different duty ratios are sent by an ECU of the engine to control the EGR valve to perform full-closing action and full-opening action, the ECU reads the positions of upper and lower dead points of the EGR valve and judges whether the positions are matched with the positions of actual dead points, and therefore the control accuracy of the EGR valve is guaranteed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method of controlling an exhaust gas recirculation valve, comprising:
sending PWM waves with different duty ratios to control the EGR valve to perform full-closing and full-opening actions, so that the EGR valve generates vibration;
judging whether the full opening and full closing actions reach the set times, if so, ending the self-cleaning mode, and entering a self-learning mode;
and in the self-learning mode, sending PWM waves with different duty ratios to control the EGR valve to carry out full-closing and full-opening actions, judging whether the error between the upper and lower dead center positions of the EGR valve obtained in the self-learning process and the preset upper and lower dead center positions exceeds the preset error range, and if not, ending the self-learning mode.
2. The exhaust gas recirculation valve control method of claim 1, further comprising:
detecting the power-off state and the power-off duration of the whole vehicle;
and when the whole vehicle is in a power-off state and the power-off duration reaches the preset duration, starting a self-cleaning mode.
3. The exhaust gas recirculation valve control method of claim 2, further comprising:
monitoring the speed of the whole vehicle, the voltage of a battery, the ambient temperature and the rotating speed of an engine;
and when the speed of the whole vehicle, the voltage of the battery, the ambient temperature and the rotating speed of the engine are all in corresponding preset ranges, entering a self-cleaning mode.
4. The exhaust gas recirculation valve control method of claim 1, wherein the control method of the self-cleaning mode comprises:
applying 100% PWM wave to the motor of the EGR valve to open the EGR valve from the full-close position to the full-open position;
when the EGR valve reaches a full-open position, applying a first positive duty ratio PWM wave to a motor of the EGR valve to crush foreign matters in a valve seat;
applying a PWM wave of-100% to a motor of the EGR valve to enable the EGR valve to be from a fully open position to a fully closed position;
when the EGR valve reaches the full-closed position, a first PWM wave of a reverse duty ratio is applied to a motor of the EGR valve to crush foreign matters in the valve seat.
5. The exhaust gas recirculation valve control method of claim 4, wherein the step of applying a 100% PWM wave to the motor of the EGR valve to open the EGR valve from the fully closed position to the fully open position further comprises:
judging whether the opening degree of the EGR valve reaches 90%;
if the opening degree of the EGR valve reaches 90%, a soft landing strategy is started;
the step of applying a-100% PWM wave to the motor of the EGR valve to move the EGR valve from the fully open position to the fully closed position further comprises:
judging whether the opening degree of the EGR valve reaches 10%;
and if the opening degree of the EGR valve reaches 10%, starting a soft landing strategy.
6. The exhaust gas recirculation valve control method of claim 5, wherein under the soft landing strategy, a rotational speed of the valve plate is less than 50 °/s or an output voltage of the position sensor is less than 2.2V/s.
7. The exhaust gas recirculation valve control method of claim 4, wherein the self-learning mode control method comprises:
applying a second reverse duty ratio PWM wave to a motor of the EGR valve, obtaining a position signal of the bottom dead center, maintaining for a certain time, obtaining a plurality of stable numerical values of the signal in the time period, and obtaining an average value of the position of the bottom dead center;
applying 100% PWM wave to the EGR valve to enable the EGR valve to move from a bottom dead center to a top dead center, maintaining for a certain time after the ERG valve reaches the top dead center, obtaining a plurality of stable numerical values of signals in the time period, and obtaining the average value of the top dead center position;
and judging whether the error between the obtained average value of the positions of the upper dead point and the lower dead point of the EGR valve and the preset position of the upper dead point and the lower dead point exceeds a preset error range, and if not, ending the self-learning mode.
8. The exhaust gas recirculation valve control method of claim 7, further comprising, after the ERG valve reaches top dead center:
applying a positive third duty ratio PWM wave to the EGR valve for a preset time to press out foreign matters in the valve seat;
and then, applying a forward fourth duty ratio PWM wave to the EGR valve for a preset time duration to obtain a plurality of stable signal values in the time period, and calculating the average value of the top dead center position.
9. The exhaust gas recirculation valve control method of claim 8, wherein a magnitude of the first duty cycle PWM wave is greater than a magnitude of the second duty cycle PWM wave, and a magnitude of the third duty cycle PWM wave is greater than a magnitude of the first duty cycle PWM wave and a magnitude of the fourth duty cycle PWM wave.
10. The exhaust gas recirculation valve control method according to claim 7, wherein if an error between the obtained average value of the top and bottom dead center positions of the EGR valve and the preset top and bottom dead center positions exceeds a preset error range, the self-cleaning mode is repeated a set number of times, and the average value of the top and bottom dead center positions is newly found in the self-learning mode, and if the error between the found average value of the top and bottom dead center positions and the preset top and bottom dead center positions still exceeds the preset error range, a malfunction is indicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315022.3A CN115217647A (en) | 2021-11-08 | 2021-11-08 | Control method of exhaust gas recirculation valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315022.3A CN115217647A (en) | 2021-11-08 | 2021-11-08 | Control method of exhaust gas recirculation valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115217647A true CN115217647A (en) | 2022-10-21 |
Family
ID=83606697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111315022.3A Pending CN115217647A (en) | 2021-11-08 | 2021-11-08 | Control method of exhaust gas recirculation valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115217647A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015486A (en) * | 2001-08-16 | 2003-02-25 | 현대자동차주식회사 | Self cleaning control method of EGR valve |
| CN102076949A (en) * | 2008-08-01 | 2011-05-25 | 三菱电机株式会社 | Valve control apparatus and valve apparatus |
| CN104863731A (en) * | 2015-06-08 | 2015-08-26 | 潍柴动力股份有限公司 | Self-cleaning method for EGR valve |
| CN105649788A (en) * | 2014-11-10 | 2016-06-08 | 联创汽车电子有限公司 | Dead-center position self-learning method of exhaust gas recirculation valve |
| CN107429606A (en) * | 2015-03-26 | 2017-12-01 | 株式会社京滨 | Control valve device and valve system |
| CN108005796A (en) * | 2017-11-28 | 2018-05-08 | 北京汽车研究总院有限公司 | A kind of Electronic Throttle Control method, apparatus and automobile |
| CN108644024A (en) * | 2018-04-27 | 2018-10-12 | 安徽江淮汽车集团股份有限公司 | A kind of control method of diesel engine EGR valve |
| KR102095660B1 (en) * | 2018-12-27 | 2020-03-31 | 창원대학교 산학협력단 | Method for learning travel range position of egr valve |
| CN112197054A (en) * | 2020-09-28 | 2021-01-08 | 东风商用车有限公司 | Valve self-cleaning control method with position feedback |
| JP2021113509A (en) * | 2020-01-17 | 2021-08-05 | 愛三工業株式会社 | Foreign matter removal control device for EGR valve |
-
2021
- 2021-11-08 CN CN202111315022.3A patent/CN115217647A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015486A (en) * | 2001-08-16 | 2003-02-25 | 현대자동차주식회사 | Self cleaning control method of EGR valve |
| CN102076949A (en) * | 2008-08-01 | 2011-05-25 | 三菱电机株式会社 | Valve control apparatus and valve apparatus |
| CN105649788A (en) * | 2014-11-10 | 2016-06-08 | 联创汽车电子有限公司 | Dead-center position self-learning method of exhaust gas recirculation valve |
| CN107429606A (en) * | 2015-03-26 | 2017-12-01 | 株式会社京滨 | Control valve device and valve system |
| CN104863731A (en) * | 2015-06-08 | 2015-08-26 | 潍柴动力股份有限公司 | Self-cleaning method for EGR valve |
| CN108005796A (en) * | 2017-11-28 | 2018-05-08 | 北京汽车研究总院有限公司 | A kind of Electronic Throttle Control method, apparatus and automobile |
| CN108644024A (en) * | 2018-04-27 | 2018-10-12 | 安徽江淮汽车集团股份有限公司 | A kind of control method of diesel engine EGR valve |
| KR102095660B1 (en) * | 2018-12-27 | 2020-03-31 | 창원대학교 산학협력단 | Method for learning travel range position of egr valve |
| JP2021113509A (en) * | 2020-01-17 | 2021-08-05 | 愛三工業株式会社 | Foreign matter removal control device for EGR valve |
| CN112197054A (en) * | 2020-09-28 | 2021-01-08 | 东风商用车有限公司 | Valve self-cleaning control method with position feedback |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108644024B (en) | Control method of EGR valve of diesel engine | |
| CN102251834B (en) | The regeneration of the particulate filter in the vent systems of motor | |
| CN110700926B (en) | Control method for realizing SCR desulfurization regeneration | |
| US8190397B2 (en) | Failure diagnosis apparatus for exhaust pressure sensor | |
| CN110182198B (en) | Control device for hybrid vehicle | |
| US8434299B2 (en) | Strategy employing exhaust back-pressure for burning soot trapped by a diesel particulate filter | |
| US9957865B2 (en) | Method of forcibly regenerating gasoline particulate filter | |
| CN102182578B (en) | NOx emission level monitoring method and device for electronic-control diesel engine EGR (exhaust gas recirculation) system | |
| EP2157302A1 (en) | Engine controller | |
| US10605176B2 (en) | Control method for engine variable valve timing of hybrid electric vehicle | |
| CN115217647A (en) | Control method of exhaust gas recirculation valve | |
| US11499510B2 (en) | Engine system and method of controlling the engine system | |
| EP2116711B1 (en) | Malfunction diagnostic device and malfunction diagnostic method for fuel system | |
| CN112648087B (en) | Self-learning control method and device for engine EGR valve | |
| JP5204279B2 (en) | Method and apparatus for controlling an internal combustion engine | |
| KR20190069003A (en) | Method for judging the regeneration strategy of the diesel particulate filter with ISG and calculating the amount of soot combustion in a controlled diesel particulate filter | |
| KR20130034457A (en) | Apparatus and method for diagnosising oxygen sensor of hybrid vehicle | |
| JP2010209828A (en) | Control device for diesel engine | |
| EP3048277A1 (en) | Method for controlling an internal combustion engine provided with a purification device for a selective catalytic reduction | |
| CN114776456B (en) | EGR valve self-learning control method and vehicle controller | |
| CN114215630B (en) | Exhaust emission control method for hybrid power gasoline vehicle | |
| US7018442B2 (en) | Method and apparatus for regenerating NOx adsorbers | |
| CN115324779B (en) | Desorption diagnosis method, desorption device, storage medium, controller and vehicle | |
| US20240140394A1 (en) | Hybrid electric vehicle | |
| CN111058955A (en) | Emission reduction control device and emission reduction control method for vehicle and engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221021 |