CN112648115A - Engine EGR self-cleaning method and device - Google Patents
Engine EGR self-cleaning method and device Download PDFInfo
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- CN112648115A CN112648115A CN202011550316.XA CN202011550316A CN112648115A CN 112648115 A CN112648115 A CN 112648115A CN 202011550316 A CN202011550316 A CN 202011550316A CN 112648115 A CN112648115 A CN 112648115A
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- 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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
- F02D41/0025—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
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- 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
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The application provides an engine EGR self-cleaning method and device, which relate to the technical field of engines, and the method comprises the following steps: detecting the current return duration of an elastic piece of an exhaust gas recirculation EGR valve when the engine is powered on; the elastic part is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic part to recover from the set compression position; if the current return duration is less than the set duration, determining the self-cleaning times of the EGR valve according to the current return duration; and when the engine is powered off, switching the opening degree of the EGR valve until the switching times reach the self-cleaning times. The elastic force of the elastic piece can be determined when the elastic piece is detected to return, when the elastic piece is normal, the self-cleaning times of the EGR valve are determined according to the length of the elastic piece when the elastic piece is returned, the self-cleaning times can be self-adapted to the aging degree of the EGR valve, the EGR valve is controlled to be self-cleaned more accurately, and therefore the self-cleaning effect of the EGR valve can be improved.
Description
Technical Field
The application relates to the technical field of engines, in particular to an engine EGR self-cleaning method and device.
Background
Gas engines have been widely accepted due to their economical and environmental protection properties, and are increasingly used in various power plants. When the gas engine works, combustible mixed gas is provided for a cylinder of the engine in a premixing air inlet mode, namely, the gas and the air are mixed in the mixer and then are sprayed into a combustion chamber of the engine through a mixed air passage to be combusted and do work.
In order to optimize the emission of the engine, an Exhaust Gas Recirculation valve (EGR) is arranged on an Exhaust pipe of the engine, part of Exhaust Gas exhausted by the engine is returned to an intake manifold through the EGR valve and enters the cylinder again together with fresh mixed Gas, on one hand, part of Exhaust Gas is combusted again, so that emission pollution can be reduced, on the other hand, part of high-temperature Exhaust Gas enters the cylinder after being cooled by an intercooler, and the detonation risk can be reduced. Because the EGR valve is exposed in an exhaust gas environment for a long time, a layer of carbon deposit is formed on the surface of the EGR valve, so that the position sensor of the EGR valve is insensitive, the dust is shaken by the self-cleaning function, and the EGR valve is enabled to sweep and clean deposits back and forth in a normal opening range.
At present, equipment maintenance personnel generally give a fixed self-cleaning frequency according to experience, wherein the self-cleaning frequency refers to the frequency of back-and-forth sweeping of the EGR valve in a normal opening range, but the self-cleaning capability of the EGR valve is weakened along with aging of the EGR valve, and the self-cleaning capability of the EGR valve cannot be self-adapted according to the fixed self-cleaning frequency, so that the self-cleaning effect is poor.
Disclosure of Invention
The application provides an engine EGR self-cleaning method and device, which are used for solving the problem that in the prior art, self-cleaning capability of an EGR valve cannot be self-adapted according to fixed self-cleaning times, so that a self-cleaning effect is poor.
The embodiment of the application provides the following specific technical scheme:
in a first aspect, an embodiment of the present application provides an engine EGR self-cleaning method, including:
detecting a current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on; the elastic piece is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic piece to recover from the set compression position;
if the current return time length is less than the set time length, determining the self-cleaning times of the EGR valve according to the current return time length;
and when the engine is powered off, switching the opening degree of the EGR valve until the switching times reach the self-cleaning times.
In some exemplary embodiments, the detecting a current return period of a resilient member of an exhaust gas recirculation EGR valve on the engine includes:
after the EGR valve is controlled to be opened to a first set opening degree, the duty ratio driven by the EGR valve is closed and controlled in a preset mode, so that the EGR valve returns to a second set opening degree from the first set opening degree under the action of the elastic member;
and taking the time length of the EGR valve from the first set opening degree to the second set opening degree as the current return time length of the elastic member.
In some exemplary embodiments, the detecting a current return period of a resilient member of an exhaust gas recirculation EGR valve when the engine is powered on includes:
detecting the current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on every other self-cleaning period;
the determining the self-cleaning times of the EGR valve according to the current return duration comprises the following steps:
acquiring stored historical return duration of the elastic member detected before the current self-cleaning period;
calculating the current return time length and the historical return time length based on an exponentially weighted moving average EWMA algorithm to obtain a target return time length;
and determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
In some exemplary embodiments, the method further comprises:
and if the current return time length is longer than the set time length, performing fault alarm, and taking the set self-cleaning times as the self-cleaning times of the EGR valve.
In some exemplary embodiments, the self-cleaning period is determined according to a set driving distance of the engine or a set operation time period of the engine.
In a second aspect, an embodiment of the present application provides an engine EGR self-cleaning device, including:
the detection module is used for detecting the current return duration of an elastic piece of the exhaust gas recirculation EGR valve when the engine is powered on; the elastic piece is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic piece to recover from the set compression position;
the determining module is used for determining the self-cleaning times of the EGR valve according to the current return time length if the current return time length is less than the set time length;
and the switching module is used for switching the opening degree of the EGR valve when the engine is powered off until the switching times reach the self-cleaning times.
In some exemplary embodiments, the detection module is further configured to:
after the EGR valve is controlled to be opened to a first set opening degree, the duty ratio driven by the EGR valve is closed and controlled in a preset mode, so that the EGR valve returns to a second set opening degree from the first set opening degree under the action of the elastic member;
and taking the time length of the EGR valve from the first set opening degree to the second set opening degree as the current return time length of the elastic member.
In some exemplary embodiments, the detection module is further configured to:
detecting the current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on every other self-cleaning period;
the determination module is further to:
acquiring stored historical return duration of the elastic member detected before the current self-cleaning period;
calculating the current return time length and the historical return time length based on an exponentially weighted moving average EWMA algorithm to obtain a target return time length;
and determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
In some exemplary embodiments, the apparatus further comprises an alarm module for:
and if the current return time length is longer than the set time length, performing fault alarm, and taking the set self-cleaning times as the self-cleaning times of the EGR valve.
In some exemplary embodiments, the self-cleaning period is determined according to a set driving distance of the engine or a set operation time period of the engine.
In a third aspect, an embodiment of the present application provides a control device, including a memory and a processor, where the memory stores a computer program executable on the processor, and when the computer program is executed by the processor, the processor is caused to implement the method according to any one of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the computer program implements the method of any one of the first aspect.
The embodiment of the application provides an engine EGR self-cleaning method, the elastic force of an elastic piece is determined by detecting the return time length of the elastic piece of an EGR valve when an engine is electrified, if the current return time length of the elastic piece is detected to be less than the set time length, the elastic force of the elastic piece is normal, the self-cleaning times of the EGR valve are determined according to the current return time length, and the opening degree of the EGR valve is switched until the switching times reach the determined self-cleaning times when the engine is electrified, so that the self-cleaning of the EGR valve is realized. Therefore, this application embodiment can detect the elasticity size of elastic component, and when the elasticity of elastic component was normal, the self-cleaning number of times of confirming the EGR valve was long according to the return of elastic component, because the elasticity size of elastic component has reflected the ageing degree of EGR valve, can make self-cleaning number of times self-adaptation EGR valve's ageing degree, control the EGR valve more accurately and carry out the automatically cleaning to can improve the automatically cleaning effect of EGR valve.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of engine EGR self-cleaning provided in an embodiment of the present application;
FIG. 2 is a flow chart of another engine EGR self-cleaning method provided in an embodiment of the present application;
FIG. 3 is a block diagram of an EGR self-cleaning device for an engine provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a control device provided in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
The following is a description of the design concept of the present application.
The opening and closing of the EGR valve is achieved by the elastic force of an elastic member, which may be a spring or the like, for example. When the elastic force of the elastic member is large, the opening or closing speed of the EGR valve is high, and the opening or closing speed of the EGR valve is reduced along with the weakening of the elastic force of the elastic member, so that the ash shaking strength of the self-cleaning of the EGR valve is influenced, namely the self-cleaning capacity of the EGR valve is influenced, and the number of times of the EGR self-cleaning is reasonably determined according to the elastic force of the elastic member. In the prior art, when the EGR valve is used for self-cleaning, the EGR valve reversely moves within a normal opening range according to fixed self-cleaning times, namely the self-cleaning times refer to the times of back and forth sweeping of the EGR valve within the normal opening range, the elastic force of the elastic part is not considered, namely the aging degree of the EGR valve is not considered, if the EGR valve is a new EGR valve, carbon deposition is less, the elastic force of the elastic part is strong, ash shaking strength is high, therefore, the self-cleaning times can be less, the ash shaking capacity is weakened along with the increase of the carbon deposition and the weakening of the elastic force of the elastic part, and the self-cleaning times need to be correspondingly.
In view of this, embodiments of the present application provide a method and an apparatus for self-cleaning an EGR valve of an engine, where a magnitude of an elastic force of an elastic member is determined by detecting a return time length of the elastic member of the EGR valve when the engine is powered on, and if it is detected that a current return time length of the elastic member is less than a set time length, which indicates that the elastic force of the elastic member is normal, a self-cleaning frequency of the EGR valve is determined according to the current return time length, and when the engine is powered off, an opening degree of the EGR valve is switched until the switching frequency reaches the determined self-cleaning frequency, so as to achieve self-. Therefore, this application embodiment can detect the elasticity size of elastic component, and when the elasticity of elastic component was normal, the self-cleaning number of times of confirming the EGR valve was long according to the return of elastic component, because the elasticity size of elastic component has reflected the ageing degree of EGR valve, can make self-cleaning number of times self-adaptation EGR valve's ageing degree, control the EGR valve more accurately and carry out the automatically cleaning to can improve the automatically cleaning effect of EGR valve.
The engine EGR self-cleaning method of the application is described in detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart illustrating a method for engine EGR self-cleaning according to an embodiment of the present disclosure. Referring to fig. 1, the engine EGR self-cleaning method includes the steps of:
step S101, detecting the current return duration of an elastic part of an exhaust gas recirculation EGR valve when an engine is electrified; the elastic piece is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic piece to recover from the set compression position.
Specifically, the elastic member may be a spring or the like having an elastic force. The controller of the EGR valve can open or close the EGR valve by controlling the elastic member, for example, when the EGR valve needs to be opened, the elastic member is controlled to pull the valve open, and when the EGR valve needs to be closed, the elastic member is controlled to push the valve to close. When the current return time is detected, the EGR valve can be controlled to be opened by a certain opening degree, so that the elastic part reaches a set compression position, then the elastic part is restored to deform under the action of no external force, and the time is counted in the process of restoring the deformation.
In practical application, the EGR valve may be periodically controlled to perform self-cleaning, that is, the EGR valve is controlled to perform one-time self-cleaning every other self-cleaning cycle, before the EGR valve performs one-time self-cleaning, the elastic force of the elastic member of the EGR valve may be detected under the condition that the engine is powered on, and specifically, the elastic force is detected by detecting the length of time for which the elastic member is returned.
The self-cleaning period may be determined according to a set driving distance of the engine or a set operation time of the engine. The driving information of the engine includes information such as a driving distance and an engine operating time, and when the engine is powered off, an engine controller ECU (Electronic Control Unit) may store a current value of the information, for example, in an EEPROM area of the ECU. When the engine is powered up again, the ECU can read information such as mileage, engine running time, etc. from the EEPROM area for engine control use.
According to the embodiment of the application, the self-cleaning period of the EGR valve can be newly added in the EEPROM area, the self-cleaning period can be taken as every time the set driving mileage is reached, and the self-cleaning period can also be taken as every time the set running duration is reached. This is because some engines, such as an engine provided in an automobile, may be operated by mileage, while some engines, such as an engine provided in an excavator, a tower crane, or the like, may not be operated by mileage, and the operation of these engines may be performed by an operation duration.
For example, the driving mileage is set to 100 miles, the engine controls the EGR valve to perform one-time self-cleaning every 100 miles, the operation duration is set to 100 hours, and the engine controls the EGR valve to perform one-time self-cleaning every 100 hours.
In specific implementation, when the self-cleaning period is stored, the self-cleaning driving mileage or the self-cleaning operation duration of the engine can be counted, and the counting result is cleared and counted again when the self-cleaning driving mileage reaches the set driving mileage or the self-cleaning operation duration reaches the set operation duration. Thus, whether the self-cleaning driving mileage reaches the set driving mileage or whether the self-cleaning operation duration reaches the set operation duration can be judged to determine whether the current return duration of the elastic member of the EGR valve needs to be detected.
And S102, if the current return time length is less than the set time length, determining the self-cleaning times of the EGR valve according to the current return time length.
The set time period may be set empirically, for example, in the case that the elastic force of the elastic member is normal, the time period during which the elastic member recovers from the set compression position may be used as the set time period. That is, if the current return time length is less than the set time length, the elastic force of the elastic member is normal, and if the current return time length is greater than the set time length, the elastic force of the elastic member is weakened.
And step S103, switching the opening of the EGR valve when the engine is powered off until the switching times reach self-cleaning times.
Specifically, under the condition that the engine is powered off, the EGR valve is controlled to carry out self-cleaning, and the control on the EGR valve during normal operation of the engine is prevented from being influenced. The opening degree of the EGR valve may be switched from one opening degree to another, for example, the maximum opening degree is 90 degrees, 0 to 90 degrees, 10 to 80 degrees, or the like. In addition, the opening degree may be switched between different opening degrees, for example, from 0 to 40 degrees, then from 40 degrees to 90 degrees, then from 90 degrees to 40 degrees … …, and so on, which is not limited in the embodiment of the present application. Preferably, in order to make the self-cleaning effect better, switching may be made between the minimum opening degree and the maximum opening degree.
It should be noted that when the engine is powered down, the engine controller still has a certain amount of electric power, that is, the engine controller delays the power down, and at this time, the opening degree of the EGR valve may be switched.
The embodiment of the application can detect the elastic force of the elastic piece, when the elastic force of the elastic piece is normal, the self-cleaning times of the EGR valve is determined according to the length of the return time of the elastic piece, and the elastic force of the elastic piece reflects the aging degree of the EGR valve, so that the self-cleaning times can be self-adapted to the aging degree of the EGR valve, the EGR valve is controlled to be self-cleaned more accurately, and the self-cleaning effect of the EGR valve can be improved.
In some exemplary embodiments, referring to fig. 2, step S101 detects a current return time period of an elastic member of an EGR valve on an engine, and may be implemented by:
and step S201, after the EGR valve is controlled to be opened to the first set opening degree, the duty ratio of the driving of the EGR valve is closed in a preset mode, so that the EGR valve returns to the second set opening degree from the first set opening degree under the action of the elastic member.
The first set opening may be set as needed, for example, the maximum opening is 90 degrees, and the first set opening may be an opening larger than 0 and smaller than 90 degrees. After the EGR valve is opened to the first set opening degree, the elastic member is compressed to the set compression position, and the duty ratio of the EGR valve driving is closed and controlled in a preset mode, for example, the engine controller may drive the EGR valve through the driving circuit, at this time, power supply to the driving circuit of the EGR valve may be stopped, and the elastic member starts to recover deformation, so that the EGR valve returns from the first set opening degree to the second set opening degree under the action of the elastic member, the second set opening degree is determined by a limit position at which the elastic member recovers deformation, the second set opening degree is usually close to 0 degree, and specifically, a position corresponding to the corresponding opening degree may be detected through the position sensor.
In step S202, the period of time for which the EGR valve is returned from the first set opening degree to the second set opening degree is taken as the current return period of time of the elastic member.
In practical application, after the engine is powered on, the detection condition of the elastic member is met, the EGR valve is controlled to be opened to a certain opening degree and then the circuit for supplying power to the EGR valve is cut off, then the EGR valve returns to a limp point (namely the second set opening degree) under the action of the elastic member, the return time of the EGR valve returning to the limp point from the opened opening degree is recorded, and the return time is stored in the EEPROM.
Further, step S102 determines the self-cleaning times of the EGR valve according to the current return time length, and may be implemented by the following steps:
1) and acquiring the stored historical return time length of the elastic member detected before the current self-cleaning period.
Specifically, the historical return time length of the elastic member detected in the last few cycles before the current self-cleaning cycle can be obtained. For example, the historical return duration may be the 5 return durations detected the last 5 cycles before the current self-cleaning cycle.
2) Based on an exponential Weighted Moving-Average (EWMA) algorithm, the current return time length and the historical return time length are calculated to obtain the target return time length.
The specific processing mode of the EWMA algorithm is as follows: weighting the return time length of the elastic member and the current return time length detected in the last several periods stored before the current self-cleaning period, wherein the weighting is known according to an exponential weighting mobile weighting formula:
the weighted return time is calculated as follows:
Ti(0)＝0
Ti(1)＝β*Ti(0)+(1-β)*T1
Ti(2)＝β*Ti(1)+(1-β)*T2
Ti(3)＝β*Ti(2)+(1-β)*T3
…
Ti(t-1)＝β*Ti(t-2)+(1-β)*Tt-1
Ti(t)＝β*Ti(t-1)+(1-β)*Tt
the formula is simplified to obtain formula (1):
Ti(t)＝(1-β)*Tt+β*(1-β)*Tt-1+β2*(1-β)*Tt-2+…+βt-2*(1-β)*T2+βt-1*(1-β)*T1 (1)
wherein, Ti(t) is the weighted pull-back duration (i.e., target pull-back duration) for the tth period; t isi(t-1) is the weighted return duration for the t-1 th cycle; t istIs the reset duration of the t-th period (i.e., the current reset duration); beta is the weight occupied by the previous period weighted return time length;
as can be seen from equation (1), the return time of the elastic member decays with a weight β as time goes backward. When the beta is 0, the weighted return time length of the previous periods can be ignored, and the weight of the current return time length is continuously reduced along with the continuous increase of the beta from 0 to 1. After the processing, the target return time length of the t period is obtained by weighted calculation of the return time lengths of the last periods, and the value of beta can be set according to needs, so that the calibration workload is reduced.
3) And determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
Specifically, the corresponding relation between the return time length and the self-cleaning times can be preset and stored, after the target return time length of the current self-cleaning period is calculated, the corresponding relation between the return time length and the self-cleaning times is searched according to the target return time length, the self-cleaning times corresponding to the target return time length can be obtained, and the self-cleaning process of the EGR valve is more flexible.
In some exemplary embodiments, the method further comprises:
and if the current return time is longer than the set time, performing fault alarm, and taking the set self-cleaning times as the self-cleaning times of the EGR valve.
The self-cleaning frequency can be set according to requirements, and in practical application, the self-cleaning frequency can be the set maximum self-cleaning frequency.
According to the embodiment of the application, the elastic force of the elastic piece is detected every a period of mileage or running time so as to determine the aging degree of the EGR valve, the self-cleaning times are calculated according to the aging degree of the EGR valve, the EGR valve is controlled to be self-cleaned according to the self-cleaning times obtained through calculation, and the control is more accurate; by adopting the EWMA weighting calculation method, the self-cleaning adaptivity can be improved, and the calibration workload is also reduced.
Based on the same inventive concept, the present application provides an engine EGR self-cleaning device, which is shown in fig. 3 and comprises:
the detection module 31 is used for detecting the current return duration of an elastic member of the exhaust gas recirculation EGR valve when the engine is powered on; the elastic part is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic part to recover from the set compression position;
the determining module 32 is configured to determine a self-cleaning frequency of the EGR valve according to the current return duration if the current return duration is less than the set duration;
and the switching module 33 is used for switching the opening degree of the EGR valve when the engine is powered off until the switching times reach the self-cleaning times.
In some exemplary embodiments, the detection module 31 may be further specifically configured to:
after the EGR valve is controlled to be opened to the first set opening degree, the duty ratio driven by the EGR valve is closed in a preset mode, so that the EGR valve returns to the second set opening degree from the first set opening degree under the action of the elastic member;
and taking the time length of the EGR valve returning from the first set opening degree to the second set opening degree as the current return time length of the elastic member.
In some exemplary embodiments, the detection module 31 may be further specifically configured to:
detecting the current return duration of an elastic member of the exhaust gas recirculation EGR valve when the engine is powered on every other self-cleaning period;
the determining module may be further specifically configured to:
acquiring stored historical return duration of the elastic member detected before the current self-cleaning period;
calculating the current return time length and the historical return time length based on an exponential weighted moving average EWMA algorithm to obtain a target return time length;
and determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
In some exemplary embodiments, the apparatus further comprises an alarm module for:
and if the current return time is longer than the set time, performing fault alarm, and taking the set self-cleaning times as the self-cleaning times of the EGR valve.
In some exemplary embodiments, the self-cleaning period is determined according to a set driving distance of the engine or a set operation time period of the engine.
Corresponding to the method embodiment, the embodiment of the application also provides a control device. The control device may be a control device of the engine, the control device comprising at least a memory for storing data and a processor for data processing. The processor for data Processing may be implemented by a microprocessor, a CPU, a GPU (Graphics Processing Unit), a DSP, or an FPGA when executing Processing. For the memory, the memory stores therein operation instructions, which may be computer executable codes, and the operation instructions implement the steps in the flow of the association word determination method according to the embodiment of the present application.
Fig. 4 is a schematic structural diagram of a control device according to an embodiment of the present disclosure. The control device may be used to control the engine. In this embodiment, the structure of the control device may be as shown in fig. 4, including a memory 401 and one or more processors 402.
A memory 401 for storing computer programs executed by the processor 402. The memory 401 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, a program required for running an instant messaging function, and the like; the storage data area can store various instant messaging information, operation instruction sets and the like.
The memory 401 may be a volatile memory (volatile memory), such as a random-access memory (RAM); the memory 401 may also be a non-volatile memory (non-volatile memory), such as a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); or memory 401 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 401 may be a combination of the above memories.
The processor 402 may include one or more Central Processing Units (CPUs), or be a digital processing unit, etc. A processor 402 for implementing the above-described service control method when calling a computer program stored in the memory 401.
The specific connection medium between the memory 401 and the processor 402 is not limited in the embodiments of the present application. In fig. 4, the memory 401 and the processor 402 are connected by a bus 403, the bus 403 is represented by a thick line in fig. 4, and the connection manner between other components is merely illustrative and not limited. The bus 403 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 4, but this does not indicate only one bus or one type of bus.
The memory 401 stores therein a computer storage medium having stored therein computer-executable instructions for implementing the engine EGR self-cleaning method of the embodiments of the present application. The processor 402 is configured to execute the engine EGR self-cleaning method described above.
Embodiments of the present application further provide a computer storage medium having computer-executable instructions stored therein, where the computer-executable instructions are used to implement the engine EGR self-cleaning method described in any of the embodiments of the present application.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit in the embodiment of the present application may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An engine EGR self-cleaning method, comprising:
detecting a current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on; the elastic piece is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic piece to recover from the set compression position;
if the current return time length is less than the set time length, determining the self-cleaning times of the EGR valve according to the current return time length;
and when the engine is powered off, switching the opening degree of the EGR valve until the switching times reach the self-cleaning times.
2. The method of claim 1, wherein said detecting a current period of repositioning of a resilient member of an Exhaust Gas Recirculation (EGR) valve on the engine comprises:
after the EGR valve is controlled to be opened to a first set opening degree, the duty ratio driven by the EGR valve is closed and controlled in a preset mode, so that the EGR valve returns to a second set opening degree from the first set opening degree under the action of the elastic member;
and taking the time length of the EGR valve from the first set opening degree to the second set opening degree as the current return time length of the elastic member.
3. The method of claim 1 or 2, wherein said detecting a current period of time for a spring return of an Exhaust Gas Recirculation (EGR) valve upon power-up of said engine comprises:
detecting the current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on every other self-cleaning period;
the determining the self-cleaning times of the EGR valve according to the current return duration comprises the following steps:
acquiring stored historical return duration of the elastic member detected before the current self-cleaning period;
calculating the current return time length and the historical return time length based on an exponentially weighted moving average EWMA algorithm to obtain a target return time length;
and determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
4. The method of claim 1, further comprising:
and if the current return time length is longer than the set time length, performing fault alarm, and taking the set self-cleaning times as the self-cleaning times of the EGR valve.
5. A method according to claim 3, wherein the self-cleaning period is determined in dependence on a set mileage of the engine or a set operating period of the engine.
6. An engine EGR self-cleaning device, comprising:
the detection module is used for detecting the current return duration of an elastic piece of the exhaust gas recirculation EGR valve when the engine is powered on; the elastic piece is used for opening or closing the EGR valve, and the current return time length is the time length for the elastic piece to recover from the set compression position;
the determining module is used for determining the self-cleaning times of the EGR valve according to the current return time length if the current return time length is less than the set time length;
and the switching module is used for switching the opening degree of the EGR valve when the engine is powered off until the switching times reach the self-cleaning times.
7. The apparatus of claim 6, wherein the detection module is further configured to:
after the EGR valve is controlled to be opened to a first set opening degree, the duty ratio driven by the EGR valve is closed and controlled in a preset mode, so that the EGR valve returns to a second set opening degree from the first set opening degree under the action of the elastic member;
and taking the time length of the EGR valve from the first set opening degree to the second set opening degree as the current return time length of the elastic member.
8. The apparatus of claim 6 or 7, wherein the detection module is further configured to:
detecting the current return duration of an elastic member of an exhaust gas recirculation EGR valve when the engine is powered on every other self-cleaning period;
the determining the self-cleaning times of the EGR valve according to the current return duration comprises the following steps:
acquiring stored historical return duration of the elastic member detected before the current self-cleaning period;
calculating the current return time length and the historical return time length based on an exponentially weighted moving average EWMA algorithm to obtain a target return time length;
and determining the self-cleaning times corresponding to the target return duration according to the preset corresponding relation between the return duration and the self-cleaning times.
9. A control device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, the computer program, when executed by the processor, causing the processor to carry out the method of any one of claims 1 to 5.
10. A computer-readable storage medium having a computer program stored therein, the computer program characterized by: the computer program, when executed by a processor, implements the method of any of claims 1 to 5.
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