CN112197054A - Valve self-cleaning control method with position feedback - Google Patents
Valve self-cleaning control method with position feedback Download PDFInfo
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- CN112197054A CN112197054A CN202011054849.9A CN202011054849A CN112197054A CN 112197054 A CN112197054 A CN 112197054A CN 202011054849 A CN202011054849 A CN 202011054849A CN 112197054 A CN112197054 A CN 112197054A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
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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
- Y02T10/12—Improving ICE efficiencies
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The application relates to a valve self-cleaning control method with position feedback, which comprises the following steps: acquiring a reference voltage value of a valve fully-closed position; acquiring a current self-learning voltage value of the valve; obtaining a difference value between the reference voltage value and the current self-learning voltage value, and judging whether to start self-cleaning of the valve or not according to the difference value; after the valve self-cleaning is started, the accumulated times of the opening and the closing of the valve are recorded, and whether the valve self-cleaning is stopped or not is judged according to the accumulated times. According to the method, valve self-cleaning and valve self-learning are combined, so that the valve self-cleaning triggering condition is optimized, the valve can be cleaned in time, the cleaning times can be controlled, unnecessary abrasion is reduced, and the service life of the valve is prolonged.
Description
Technical Field
The invention relates to the technical field of valve control, in particular to a valve self-cleaning control method with position feedback.
Background
The valves on the engine are exposed to the exhaust gas environment for a long time, so that carbon deposition and fouling are easy to generate. A large amount of deposits such as carbon deposition, dirt and the like are accumulated on a valve plate and a valve body, so that the valve is quickly coked and even clamped, the aging of the valve is accelerated, and the performance of an engine is reduced and the emission exceeds the standard. In the prior art, the self-cleaning function of the valve is added, the valve is fully opened and fully closed in the process and generates vibration, the deposits accumulated on the valve can be effectively removed, the stable and reliable working state of the valve is ensured, and the service life of the valve is prolonged.
In some related art, the inventor found that the valve self-cleans after each engine shutdown and power down, and the cleaning frequency is too frequent, which causes unnecessary wear of the valve. In other related art valves need to reach a certain mileage to perform self-cleaning. Therefore, the triggering condition of the self-cleaning of the existing valve is not accurate enough, so that the problem that the valve cannot be cleaned or cleaned excessively in time is caused.
Disclosure of Invention
The embodiment of the invention provides a valve self-cleaning control method with position feedback, which optimizes the valve self-cleaning triggering condition, ensures that the valve is cleaned in time, and can control the cleaning times at the same time, thereby reducing unnecessary wear.
In a first aspect, a valve self-cleaning control method with position feedback is provided, which includes: acquiring a reference voltage value of a valve fully-closed position; acquiring a current self-learning voltage value of the valve; obtaining a difference value between the reference voltage value and the current self-learning voltage value, and judging whether to start self-cleaning of the valve or not according to the difference value; after the valve is started to self-clean, counting the opening and closing times of the valve, and judging whether to stop the self-cleaning of the valve according to the opening and closing times of the valve.
In some embodiments, said determining whether to initiate valve self-cleaning based on said difference comprises: if the difference value is less than or equal to a preset threshold value A, the valve is not started to be self-cleaned; and if the difference value is larger than a preset threshold value A, starting the valve to self-clean.
In some embodiments, the determining whether to stop the self-cleaning of the valve according to the number of times the valve is opened and closed includes: and if the opening and closing times of the valve are larger than or equal to the counting threshold value M, stopping self-cleaning of the valve.
In some embodiments, said determining whether to initiate valve self-cleaning based on said difference further comprises: if the difference is less than or equal to the threshold value B, the valve is not started to be self-cleaned; if the difference value is larger than a threshold value C, starting the valve to self-clean, wherein the threshold value C is larger than a threshold value B; and if the difference is larger than the threshold B and smaller than or equal to the threshold C, counting the driving cycle times, and judging whether to start the valve self-cleaning according to the driving cycle times.
In some embodiments, after counting the number of driving cycles and determining whether to start the valve self-cleaning according to the number of driving cycles if the difference is greater than the threshold B and less than or equal to the threshold C, the method further includes: and after the valve is stopped from self-cleaning, resetting the driving cycle times.
In some embodiments, said determining whether to initiate valve self-cleaning based on said number of driving cycles comprises: and if the driving cycle number is larger than a preset counting threshold value N, starting the valve to self-clean.
In some embodiments, the determining whether to stop the self-cleaning of the valve according to the number of times the valve is opened and closed further includes: after the difference value is larger than a threshold value C and the valve is started to be self-cleaned, comparing the opening and closing times of the valve with a counting threshold value Q, and judging whether the self-cleaning of the valve is stopped; and after the valve self-cleaning waiting program is finished and the valve self-cleaning is started, comparing the opening and closing times of the valve with a counting threshold value S, and judging whether to stop the valve self-cleaning.
In some embodiments, the count threshold Q is greater than the count threshold S.
In some embodiments, the obtaining the reference voltage value of the fully-closed valve position includes: acquiring a voltage storage value of a valve fully-closed position; and when the voltage storage value is 0, acquiring an initial self-learning voltage value of the fully-closed position of the valve. The reference voltage value of the valve fully-closed position is an initial self-learning voltage value of the valve fully-closed position. And the step of acquiring the current self-learning voltage value comprises the steps of carrying out valve self-learning after the engine is stopped, and recording and storing the current self-learning voltage value.
In some embodiments, the obtaining the voltage storage value for the fully-closed valve position comprises: and acquiring an initial voltage value of the valve in a stop and full-close state of the engine. The obtaining of the initial self-learning voltage value of the fully-closed valve position comprises: and when the engine is stopped and the valve is fully closed, acquiring a voltage value of the valve after the valve is subjected to first self-learning.
The embodiment of the invention provides a valve self-cleaning control method with position feedback, which judges whether to start valve self-cleaning or not through the difference value between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve, optimizes the triggering condition of valve self-cleaning, and avoids the problem of over-cleaning of the valve while ensuring the valve to be cleaned in time. Meanwhile, after the valve is started to be automatically cleaned, whether the valve is stopped to be automatically cleaned is judged according to the opening and closing times of the valve, the cleaning times are controlled, and unnecessary abrasion is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a first embodiment of a valve self-cleaning control method with position feedback according to the present invention;
FIG. 2 is a schematic flow chart illustrating a second embodiment of a valve self-cleaning control method with position feedback according to the present invention;
FIG. 3 is a schematic flow chart of a valve self-cleaning control method with position feedback according to a third embodiment of the present invention;
FIG. 4 is a schematic control flow chart of the first and second embodiments of the present invention;
fig. 5 is a control flow diagram of the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In some embodiments, the invention provides a valve self-cleaning control method with position feedback, which includes obtaining a reference voltage value of a valve fully-closed position; acquiring a current self-learning voltage value of the valve; obtaining a difference value between the reference voltage value and the current self-learning voltage value, and judging whether to start self-cleaning of the valve or not according to the difference value; after the valve is started to self-clean, counting the opening and closing times of the valve, and judging whether to stop the self-cleaning of the valve according to the opening and closing times of the valve. The self-cleaning triggering condition of the valve is optimized, the cleaning times can be controlled while the valve is ensured to be cleaned in time, and unnecessary abrasion is reduced.
As shown in fig. 1, fig. 1 is a schematic flow chart of a valve self-cleaning control method with position feedback according to a first embodiment of the present invention.
In a first embodiment, a valve self-cleaning control method with position feedback comprises the following steps:
and step S10, acquiring a reference voltage value of the fully-closed valve position.
And step S20, acquiring the current self-learning voltage value of the valve.
It should be noted that the valves mentioned in the present embodiment include, but are not limited to, valve components with position feedback, such as an EGR valve, a throttle valve, an exhaust brake valve, etc., and the application scope of the present embodiment should include self-cleaning application scenarios of these different types of valves.
It is understood that the valve fully-closed position may be a position of the valve in a closed state, and the reference voltage value is a voltage value in a state before the valve self-learning is not performed with respect to a current self-learning voltage value of the valve. And the current self-learning voltage value of the valve is a voltage value obtained in the current state of the valve after the valve self-learning is performed relative to the reference voltage value of the fully-closed position of the valve. The obtaining a reference voltage value for a fully closed position of the valve and the obtaining a current self-learned voltage value of the valve include storing the measured voltage values in a memory for later use.
And step S30, obtaining the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve, and judging whether to start the valve for self-cleaning according to the difference value.
It can be understood that the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve is the difference value between the voltages before and after the valve is in self-learning.
In the specific implementation, whether to start self-cleaning of the valve is judged according to the difference value between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve, whether to start self-cleaning of the valve is judged according to the difference of the cleaning degrees of the valve reflected by the difference value, if the cleaning degree of the valve reflected by the difference value is very high, the self-cleaning of the valve is not started, and if the cleaning degree of the valve reflected by the difference value is very low, the self-cleaning of the valve is started.
And step S40, after the valve is started to self-clean, counting the opening and closing times of the valve, and judging whether to stop the self-cleaning of the valve according to the opening and closing times of the valve.
It should be noted that the number of times of opening and closing the valve refers to the number of times of re-closing the valve after one time of opening when the valve performs self-cleaning, that is, the number of times of opening and re-closing the valve is counted as one time of opening and closing the valve.
In the specific implementation, after the valve self-cleaning is started, whether the valve self-cleaning is stopped is judged according to the valve opening and closing times, if the valve opening and closing times meet the valve self-cleaning requirement, the valve self-cleaning can be stopped, and the control on the valve self-cleaning strength is realized.
According to the scheme, the self-cleaning method and the self-cleaning device can be used for self-cleaning application scenes of different types of valves with position feedback, whether self-cleaning of the valves is started or not is judged through the difference value of the reference voltage value of the fully-closed position of the valves and the current self-learning voltage value of the valves, the situation that self-cleaning is triggered according to mileage or self-cleaning of the electric valves is carried out as long as an engine is stopped is avoided, the triggering condition of self-cleaning of the valves is optimized, meanwhile, after the self-cleaning of the valves is started, counting of the opening and closing times of the valves is carried out, whether the self-cleaning of the valves is stopped or not is judged according to the opening.
Further, fig. 2 is a schematic flowchart of a second embodiment of a valve self-cleaning control method with position feedback provided by the present invention, and as shown in fig. 2, based on the valve self-cleaning control method with position feedback provided by the first embodiment, in this embodiment, the step S30 specifically includes the following steps:
step S301: and the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve is less than or equal to a preset threshold value A, and the valve is not started to be self-cleaned.
It should be noted that the preset threshold a can be set according to different types of valves and different degrees of cleaning requirements.
It can be understood that, when the difference between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve is less than or equal to the preset threshold value a, it can be regarded that the trigger condition for starting the self-cleaning of the valve is not reached, and the valve does not need to be self-cleaned.
In the specific implementation, the preset threshold value A is set, so that self-cleaning is not started according to the actual situation when cleaning is not needed, the triggering condition of self-cleaning of the valve is optimized, and the frequency of frequent self-cleaning is reduced.
Step S302: and (4) starting the valve to self-clean when the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve is larger than a preset threshold value A.
It can be understood that, when the difference between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve is greater than the preset threshold a, it can be considered that a trigger condition for starting self-cleaning of the valve is reached, and the valve needs to be self-cleaned.
In the specific implementation, the self-cleaning of the valve is started in time according to the actual situation by setting the preset threshold value A, so that the triggering condition of the self-cleaning of the valve is optimized.
Further, based on the valve self-cleaning control method with position feedback proposed in the second embodiment, in some embodiments, the step S40 specifically includes the following steps:
step S401: and counting the opening and closing times of the valve.
Step S402: and if the opening and closing times of the valve are smaller than the counting threshold value M, cleaning the valve.
Step S403: and if the opening and closing times of the valve are larger than or equal to the counting threshold value M, stopping self-cleaning of the valve.
It should be noted that the count threshold M is used to control when to stop the valve self-cleaning, and may be set according to different types of valves and different degrees of cleaning requirements. The emphasis is on controlling the number of times the valve is self-cleaning so that the valve can be self-cleaned as necessary but not excessively.
It is understood that when the number of times the valve is opened and closed is less than the count threshold M, it means that the valve has not reached the required cleaning state and the condition for stopping self-cleaning is not satisfied. When the valve opening and closing times are larger than or equal to the counting threshold value M, the valve can be considered to be cleaned, and the condition of stopping self-cleaning is met.
In specific implementation, the counting threshold M can be set to play a role in controlling the self-cleaning times of the valve, so that unnecessary self-cleaning of the valve is reduced, and the effect of reducing the abrasion of the valve is achieved.
In other embodiments, the invention provides a valve self-cleaning control method with position feedback, and the triggering condition of valve self-cleaning is further optimized by setting a preset threshold value B and a preset threshold value C.
As shown in fig. 3, fig. 3 is a schematic flow chart of a valve self-cleaning control method with position feedback according to a third embodiment of the present invention.
In a third embodiment, a valve self-cleaning control method with position feedback comprises the following steps:
and step S10, acquiring a reference voltage value of the fully-closed valve position.
And step S20, acquiring the current self-learning voltage value of the valve.
And step S31, comparing the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve with a preset threshold value B and a preset threshold value C and judging whether to start self-cleaning of the valve.
It should be noted that the preset threshold B is a threshold parameter set corresponding to the preset threshold C, and is used for better optimizing a valve self-cleaning triggering condition according to a requirement of a practical application scene and conditions of software and hardware for valve self-cleaning. The preset threshold B and the preset threshold A can be applied to different application scenes and meet different self-cleaning requirements of the valve.
It is understood that the steps S10 and S20 are the same as those in the previous embodiment, and are different from the previous embodiment in that by setting the preset threshold B and the preset threshold C, and the preset threshold B and the preset threshold C may be set to be different from the preset threshold a, the determination interval for determining the start and stop of the valve is increased, so as to optimize the triggering condition for self-cleaning of the valve.
Further, in some embodiments, step S31 further includes:
and step S311, if the difference value is less than or equal to the threshold value B, the valve is not started to be self-cleaned.
And S312, if the difference value is larger than a threshold value C, starting the valve to self-clean, wherein the threshold value C is larger than a threshold value B.
And step S313, counting the driving cycle times if the difference is greater than the threshold B and less than or equal to the threshold C, and judging whether to start the valve self-cleaning according to the driving cycle times.
It should be noted that the number of driving cycles is understood as a process in which the engine is turned off after one engine start is referred to as one driving cycle.
Further, step S313 further includes:
and step 313a, if the driving cycle number is larger than a preset counting threshold value N, starting the valve to self-clean.
And step 313b, if the driving cycle number is less than or equal to a preset counting threshold value N, starting the valve to self-clean.
Step S313 is followed by: step S50: and after the valve is stopped from self-cleaning, resetting the driving cycle times.
It can be understood that when the difference value between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve is greater than the preset threshold value B and less than or equal to the preset threshold value C, the valve is in a state of needing self-cleaning, but can still wait continuously, and the condition of immediately starting the self-cleaning of the valve is not met. On the basis, the driving cycle number is counted, the driving cycle number is used as a trigger condition for judging the self-cleaning of the valve, and the self-cleaning is further judged on the basis of the original judgment.
By the aid of the scheme, the driving cycle times are increased as judging conditions on the basis of judging whether to start the self-cleaning of the valve according to different requirements of the self-cleaning of the valve and the difference value between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve, and triggering conditions of the self-cleaning of the valve are optimized.
Further, based on the third embodiment, after the step S31, the method further includes a step S40, and the step S40 includes:
step S404: after the valve self-cleaning is started in step S312, the number of times of opening and closing the valve is compared with the count threshold Q, and it is determined whether to stop the valve self-cleaning.
Step S405: after the self-cleaning of the valve is started in step S313, the number of times the valve is opened and closed is compared with the count threshold S, and it is determined whether to stop the self-cleaning of the valve.
It should be noted that the counting threshold S is based on the valve self-cleaning scenario applied in the third embodiment, and particularly, when the difference between the fully-closed position reference voltage value and the current self-learning voltage value of the valve is greater than the preset threshold B and less than or equal to the preset threshold C, the self-cleaning of the valve is started after the number of driving cycles is counted. The counting threshold Q and the counting threshold S are set correspondingly, and the counting threshold S, the counting threshold Q and the counting threshold M should not be regarded as equivalent parameters due to different faced practical application scenarios and different degrees of demands for self-cleaning of the valve.
It is understood that, in the case that the preset threshold B and the preset threshold C are set, the count threshold Q or the count threshold S is set for one of two different trigger conditions for starting the valve self-cleaning, so as to further optimize the trigger condition for stopping the valve self-cleaning after the valve is started.
In particular implementations, the count threshold Q may be set greater than the count threshold S, depending on the actual valve self-cleaning requirements.
Fig. 4 is a schematic control flow diagram of the valve self-cleaning control method with position feedback according to the first and second embodiments of the present invention. As shown in fig. 4, acquiring a reference voltage value of a valve fully-closed position and a current self-learning voltage value of the valve, and judging whether a difference value between the reference voltage value and the current self-learning voltage value is greater than a preset threshold value a; if not, the valve is not started to self-clean, and if yes, the valve is started to self-clean. Starting the valve to self-clean, simultaneously counting the opening and closing times of the valve, judging whether the opening and closing times of the valve are more than or equal to a counting threshold value M, and if so, stopping the self-cleaning of the valve; if not, the valve self-cleaning is not stopped and the valve self-cleaning is returned again.
Based on the valve self-cleaning control method with the position feedback shown in the figure 4, whether to start valve self-cleaning is judged through the difference value between the reference voltage value of the valve fully-closed position and the current self-learning voltage value of the valve, the condition that self-cleaning is triggered according to the mileage number or the electric valve is self-cleaned only when an engine is stopped is avoided, the triggering condition of valve self-cleaning is optimized, meanwhile, after the valve is started to be self-cleaned, the valve opening and closing times are counted, whether to stop valve self-cleaning is judged according to the valve opening and closing times, the valve can be timely cleaned, the cleaning times can be controlled, and valve abrasion caused by unnecessary cleaning times is reduced.
Fig. 5 is a schematic control flow diagram of a valve self-cleaning control method with position feedback according to a third embodiment of the present invention. As shown in fig. 5, acquiring a reference voltage value of a valve fully-closed position and a current self-learning voltage value of the valve, and judging whether a difference value between the reference voltage value and the current self-learning voltage value is greater than a preset threshold value B; if not, the valve self-cleaning is not started, if yes, whether the difference value is larger than a preset threshold value C or not is judged, if yes, the valve self-cleaning is started, meanwhile, the valve opening and closing times are counted, whether the valve opening and closing times are larger than or equal to a counting threshold value Q or not is judged, if yes, the valve self-cleaning is stopped, and if not, the valve self-cleaning is not stopped and the valve self-cleaning is returned again; when the difference value is judged to be larger than a preset threshold value C, if not, counting the driving cycle times and judging whether the driving cycle times are larger than a counting threshold value N, if not, not starting the self-cleaning of the valve, if so, starting the self-cleaning of the valve and counting the opening and closing times of the valve, judging whether the opening and closing times of the valve are larger than or equal to a counting threshold value S, and if so, stopping the self-cleaning of the valve and resetting the driving cycle times; if not, the valve self-cleaning is not stopped and the valve self-cleaning is returned again.
Based on the valve self-cleaning control method with position feedback shown in fig. 5, whether to start the valve self-cleaning is judged by the difference value between the reference voltage value of the fully-closed position of the valve and the current self-learning voltage value of the valve, so that the condition that the self-cleaning is triggered according to the mileage or the electric valve is self-cleaned only when the engine is stopped is avoided, and the triggering condition of the valve self-cleaning is optimized. On the basis, the preset threshold value A and the preset threshold value B are set, the driving cycle times are increased to serve as conditions for judging and starting the self-cleaning of the valve, and the triggering conditions for the self-cleaning of the valve can be further optimized. Meanwhile, after the valve is started to be automatically cleaned, the number of times of opening and closing the valve is counted, different counting thresholds Q and S are set according to the condition that the valve is started to be automatically cleaned under two different triggering conditions, the triggering condition that the valve is stopped to be automatically cleaned after being started can be further optimized, the number of times of cleaning can be controlled while the valve is ensured to be timely cleaned, and valve abrasion caused by unnecessary cleaning times is reduced.
In some embodiments, the step S10 further includes: acquiring a voltage storage value of a valve fully-closed position; when the voltage storage value is 0, acquiring an initial self-learning voltage value of a valve fully-closed position; the reference voltage value of the valve fully-closed position is an initial self-learning voltage value of the valve fully-closed position. The step S20 further includes: and when the engine is stopped, performing valve self-learning, and recording and storing the current self-learning voltage value.
It should be noted that obtaining the voltage storage value for the fully closed valve position includes obtaining an initial voltage value of the valve in the engine stop and fully closed state. The step of obtaining the initial self-learning voltage value of the fully-closed position of the valve comprises the step of obtaining the voltage value of the valve after the valve is subjected to first self-learning when the engine is stopped and the valve is fully closed.
In one embodiment, the valve is an EGR valve, the preset threshold B is set to 0.01V, the preset threshold C is set to 0.02V, the count threshold N is set to 30, the count threshold S is set to 3, the count threshold Q is set to 8, and the valve fully-closed position reference voltage value d is set to 0.700V.
Assuming that the self-learning voltage value c is 0.705V, the valve self-cleaning is not started because c-d < B.
Assuming that the self-learning voltage value c of a certain time is 0.715V, when c-d is more than B, the driving cycle number is increased by 1. At the moment, self-cleaning of the valve cannot be started immediately, and the self-cleaning of the valve is started when the accumulated number of driving cycles exceeds 30 and is larger than a counting threshold value N. After the valve self-cleaning is started, if the valve opening and closing times exceed 3 times, the valve self-cleaning is stopped, and the driving cycle times are reset.
Assuming that the self-learning voltage value C is 0.725V at a certain time, and C-d is larger than C, the self-cleaning of the valve is started immediately. And after the valve self-cleaning is started, if the opening and closing times of the valve exceed 8 times, the valve self-cleaning is stopped.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A valve self-cleaning control method with position feedback is characterized by comprising the following steps:
acquiring a reference voltage value of a valve fully-closed position;
acquiring a current self-learning voltage value of the valve;
obtaining a difference value between the reference voltage value and the current self-learning voltage value, and judging whether to start self-cleaning of the valve or not according to the difference value;
after the valve is started to self-clean, counting the opening and closing times of the valve, and judging whether to stop the self-cleaning of the valve according to the opening and closing times of the valve.
2. A valve self-cleaning control method with position feedback as claimed in claim 1, wherein said determining whether to activate valve self-cleaning based on said difference comprises:
if the difference value is less than or equal to a preset threshold value A, the valve is not started to be self-cleaned;
and if the difference value is larger than a preset threshold value A, starting the valve to self-clean.
3. The method of claim 2, wherein the determining whether to stop the self-cleaning of the valve according to the number of times the valve is opened or closed comprises:
and if the opening and closing times of the valve are larger than or equal to the counting threshold value M, stopping self-cleaning of the valve.
4. A valve self-cleaning control method with position feedback as claimed in claim 1, wherein said determining whether to initiate valve self-cleaning based on said difference further comprises:
if the difference is less than or equal to the threshold value B, the valve is not started to be self-cleaned;
if the difference value is larger than a threshold value C, starting the valve to self-clean, wherein the threshold value C is larger than a threshold value B;
and if the difference is larger than the threshold B and smaller than or equal to the threshold C, counting the driving cycle times, and judging whether to start the valve self-cleaning according to the driving cycle times.
5. The method of claim 4, wherein after counting the number of driving cycles and determining whether to initiate self-cleaning of the valve according to the number of driving cycles if the difference is greater than the threshold B and less than or equal to the threshold C, the method further comprises:
and after the valve is stopped from self-cleaning, resetting the driving cycle times.
6. The valve self-cleaning control method with position feedback as claimed in claim 4, wherein the determining whether to start valve self-cleaning according to the driving cycle number comprises:
and if the driving cycle number is larger than a preset counting threshold value N, starting the valve to self-clean.
7. The method of claim 4, wherein the determining whether to stop the self-cleaning of the valve according to the number of times the valve is opened or closed further comprises:
after the difference value is larger than a threshold value C and the valve is started to be self-cleaned, comparing the opening and closing times of the valve with a counting threshold value Q, and judging whether the self-cleaning of the valve is stopped;
and after the valve self-cleaning waiting program is finished and the valve self-cleaning is started, comparing the opening and closing times of the valve with a counting threshold value S, and judging whether to stop the valve self-cleaning.
8. A valve self-cleaning control method with position feedback as claimed in claim 7, characterized in that the count threshold Q is larger than the count threshold S.
9. A valve self-cleaning control method with position feedback as claimed in claim 1, wherein said obtaining a reference voltage value for a fully-closed valve position comprises:
-obtaining a stored value of the voltage for the fully closed position of the valve;
-obtaining an initial self-learned voltage value for a fully closed valve position when said voltage storage value is 0;
the reference voltage value of the valve fully-closed position is an initial self-learning voltage value of the valve fully-closed position;
the obtaining of the current self-learning voltage value includes: and when the engine is stopped, performing valve self-learning, and recording and storing the current self-learning voltage value.
10. The self-cleaning control method of valve with position feedback as claimed in claim 9,
the obtaining of the voltage storage value of the fully closed valve position comprises: acquiring an initial voltage value of a valve in a fully-closed state when an engine is stopped;
the obtaining of the initial self-learning voltage value of the fully-closed valve position comprises: and when the engine is stopped and the valve is fully closed, acquiring a voltage value of the valve after the valve is subjected to first self-learning.
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