CN114592991A - Valve control method and device - Google Patents
Valve control method and device Download PDFInfo
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- CN114592991A CN114592991A CN202210223990.XA CN202210223990A CN114592991A CN 114592991 A CN114592991 A CN 114592991A CN 202210223990 A CN202210223990 A CN 202210223990A CN 114592991 A CN114592991 A CN 114592991A
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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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
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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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/32—Liquid-cooled heat exchangers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The embodiment of the application provides a valve control method which is used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the parking state, the first valve may be controlled to maintain the maximum opening degree. The first valve is a coolant inlet valve of the EGR system. In this way, immediately after the vehicle is started, the first valve is in the maximum opening state, and the EGR system is heated by the coolant so that the temperature of the EGR system is maintained in a high range, thereby preventing coking due to excessively low EGR temperature. During vehicle operation, the EGR system temperature may be obtained and it may be determined whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be adaptively adjusted to maintain the EGR system temperature within a desired range. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the EGR system is prevented from being broken down.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a valve control method and device.
Background
With the environmental pollution, how to reduce the pollutant emission of vehicles becomes an important problem for solving the environmental pollution. As a means, an Exhaust Gas Recirculation (EGR) system may be deployed in a vehicle. EGR systems may be used to reduce the content of nitrogen oxides (NOx) in engine exhaust. Specifically, the EGR system can mix exhaust gas generated by a combustion chamber of the engine with air entering the engine, reduce the oxygen content in air inlet of the engine, thereby reducing the temperature of the combustion chamber of the engine, reducing the generation amount of nitrogen oxides and reducing the emission amount of pollutants of the engine.
However, in an environment of high cold and low temperature, the temperature of the EGR system is close to the ambient temperature and is in a low state. While the temperature of the exhaust gas exiting the combustion chamber may be relatively high. Coking of exhaust gases may occur when higher temperature exhaust gases enter a lower temperature EGR system. Coking products can block the EGR system, and jamming faults occur, so that the normal work of the EGR system is influenced.
Disclosure of Invention
In view of this, embodiments of the present application provide a valve control method and apparatus, which aim to flexibly control the temperature of an EGR system and avoid the EGR system from malfunctioning.
In a first aspect, an embodiment of the present application provides a valve control method, where the method includes:
controlling a first valve to keep a maximum opening degree in response to a vehicle entering an operating state from a parking state, wherein the first valve is a coolant inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and coolant is used for raising the temperature of the EGR system;
acquiring the temperature of the EGR system;
in response to the EGR system temperature reaching a first temperature threshold, controlling an opening of the first valve based on the EGR system temperature.
In one possible design, the controlling the opening of the first valve according to the EGR system temperature includes:
calculating a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relation, wherein the target valve opening corresponding relation comprises a corresponding relation between the EGR system temperature and the opening of the first valve;
and controlling a first valve according to the target opening degree so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with the highest efficiency of the EGR system.
In one possible design, the calculating the target opening corresponding to the EGR system temperature according to the target valve opening correspondence includes:
obtaining engine operating parameters of the vehicle, wherein the engine operating parameters comprise load and/or rotating speed of an engine of the vehicle;
and determining the corresponding relation of the target valve opening from the corresponding relations of a plurality of valve openings according to the working parameters of the engine, wherein the corresponding relations of the plurality of valve openings are different from the corresponding relations of the target valve opening.
In one possible design, the controlling the opening of the first valve according to the EGR system temperature includes:
determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, wherein the target opening degree is matched with the EGR system temperature;
and controlling the opening degree of the first valve to be the target opening degree.
In a second aspect, an embodiment of the present application provides a valve control apparatus, including:
the control unit is used for responding to the vehicle entering the working state from the parking state and controlling a first valve to keep the maximum opening degree, wherein the first valve is a cooling liquid water inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and the cooling liquid is used for increasing the temperature of the EGR system;
an acquisition unit configured to acquire the EGR system temperature;
the control unit is further used for responding to the fact that the temperature of the EGR system reaches a first temperature threshold value, and controlling the opening degree of the first valve according to the temperature of the EGR system.
In one possible design, the control unit is specifically configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relationship, where the target valve opening corresponding relationship includes a corresponding relationship between the EGR system temperature and the opening of the first valve; and controlling a first valve according to the target opening degree so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with the highest efficiency of the EGR system.
In one possible design, the control unit is specifically configured to obtain engine operating parameters of the vehicle, where the engine operating parameters include a load and/or a rotational speed of an engine of the vehicle; and determining the target valve opening corresponding relation from a plurality of valve opening corresponding relations according to the engine working parameters, wherein the plurality of valve opening corresponding relations are different in engine working parameters.
In one possible design, the control unit is configured to determine a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, and the target opening degree is matched with the EGR system temperature; and controlling the opening degree of the first valve to be the target opening degree.
In a third aspect, an embodiment of the present application provides an apparatus, which includes a memory for storing instructions or codes, and a processor for executing the instructions or codes to perform the valve control method according to any one of the foregoing first aspects.
In a fourth aspect, embodiments of the present application provide a vehicle comprising an EGR system and a controller for controlling a first valve of the EGR system to implement a valve control method as described in any one of the preceding first aspects
The embodiment of the application provides a valve control method and device, which are used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the parking state, the first valve may be controlled to maintain the maximum opening degree. The first valve is a coolant inlet valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, the EGR system is heated through the cooling liquid, the temperature of the EGR system can be kept in a high range, and coking caused by too low temperature of the EGR system is avoided. As the temperature of the EGR system increases during vehicle operation, the flow rate of coolant used to heat the EGR system may be reduced. Specifically, the EGR system temperature may be obtained and it may be determined whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be decreased as appropriate. Specifically, the opening of the first valve may be controlled based on the EGR system temperature. That is, when the temperature of the EGR system is low, the EGR system is heated by the coolant; after the EGR system temperature rises to the first temperature threshold, the flow of coolant to heat the EGR system is reduced. Thus, not only can the exhaust gas coking caused by too low EGR temperature be prevented, but also the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the EGR system is prevented from being broken down.
Drawings
To illustrate the present embodiment or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any creative work.
FIG. 1 is a flow chart of a method of controlling a valve according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a valve control device according to an embodiment of the present disclosure.
Detailed Description
When the engine works, air is sucked into the combustion chamber from the air inlet, the air and fuel are mixed and combusted in the combustion chamber, and then the air and the fuel are discharged from the combustion chamber through the air outlet. If the temperature in the combustion chamber is too high, combustion of the fuel may generate nitrogen oxides (NOx) such as nitrogen monoxide and nitrogen dioxide. The pollution of nitrogen oxides to the environment is serious. In order to reduce the pollution of vehicles, it is necessary to reduce the content of nitrogen oxides in the exhaust gas of the engine. Therefore, EGR systems are currently most deployed on vehicle engines.
The EGR system may direct a portion of the exhaust gas exiting the exhaust port to the intake port of the engine to mix with the intake air of the engine and enter the combustion chamber. Thus, since the exhaust gas from the exhaust port has a low oxygen content, mixing the exhaust gas with air can reduce the oxygen content of the gas entering the combustion chamber of the engine, thereby inhibiting the combustion of fuel and reducing the temperature in the combustion chamber of the engine. Therefore, the content of nitrogen oxide in the exhaust gas generated by combustion is low, and the pollution of the engine exhaust to the environment is reduced.
In a severe cold environment, the temperature of each device in the vehicle in a parked state for a long time is close to the ambient temperature. The temperature of the EGR system is low. While the temperature of the exhaust gas discharged from the engine combustion chamber is high. As such, when exhaust gas enters the EGR system, the high temperature exhaust gas may be rapidly cooled by the EGR system. The temperature drop causes condensation of water vapor and sulfides in the exhaust gas, and the water vapor and sulfides adhere to the surface of the EGR system in a solid state, thereby causing coking. With the severity of coking, the passages in the EGR system for the transfer of exhaust gas may become clogged with coking, causing stuck faults that affect the normal operation of the vehicle.
In order to increase the temperature for reasonably controlling the EGR system, the embodiment of the application provides a valve control method and a valve control device.
Optionally, the technical solution provided in the embodiment of the present application may be applied to an Electronic Control Unit (ECU) on a vehicle, and may also be applied to a device having data processing capability on a vehicle, such as an on-board computer. Alternatively, if the engine of another device other than the vehicle is also applied with the EGR system, the valve control method provided in the embodiment of the present application may also be applied to the control apparatus of the device.
From the perspective of the electronic control unit. The valve control method provided by the embodiment of the application is explained. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of 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.
Referring to fig. 1, fig. 1 is a flowchart of a method of controlling a valve according to an embodiment of the present application, including:
s101: and acquiring a vehicle starting signal, and controlling the first valve to keep the maximum opening.
If the vehicle is in a parking state, all components on the vehicle are in a dormant or closed state, and the engine of the vehicle does not operate. After the vehicle starts, the engine starts to operate. The coolant is used to cool the engine during operation of the engine to prevent overheating of the engine. That is, after the vehicle enters the operating state, the temperature of the coolant gradually increases due to the operation of the engine. Therefore, to increase the temperature of the EGR system, the EGR system may be heated by the coolant.
Therefore, to avoid the EGR system temperature being too low, resulting in coking of the EGR system, the first valve may be controlled to open just after the vehicle is started. Wherein, the first valve is a coolant inlet valve of the EGR system. If the first valve is in the open state, coolant flows into a cooler of the EGR system, and the temperature of the EGR system increases due to heating of the coolant. Therefore, coking caused by too low temperature of the EGR system can be avoided to a certain extent.
However, the time when the vehicle is started is the time when the EGR system temperature is lowest, and the temperature of the coolant is relatively low immediately after the engine enters the operating state. Therefore, in order to improve the heating effect of the EGR system and further prevent coking, the opening degree of the first valve may be controlled to the maximum opening degree of the first valve, that is, the first valve may be controlled to be fully opened. Thus, the flow rate of the cooling liquid for heating the EGR system is increased, the temperature of the EGR system can be increased to a higher level more quickly, and the coking of the EGR system is further prevented. As the vehicle operates, the higher temperature exhaust gases gradually increase the temperature of the EGR system, and the heating of the coolant also causes the temperature of the EGR system to increase. Thus, if the first valve is maintained in a fully open state at all times, the temperature of the EGR system may be excessive.
However, the efficiency of exhaust gas recirculation may vary as the temperature of the EGR system varies. Specifically, if the temperature of the EGR system is too high, resulting in the exhaust gas being maintained in a high temperature state, the temperature of the gas entering the combustion chamber after the exhaust gas is mixed with air may be high, resulting in a deterioration of the effect of the EGR system in reducing the emission amount of nitrogen oxides. Also, if the temperature of the EGR system is too high, resulting in the exhaust gas being maintained in a low temperature state, the temperature of the gas entering the combustion chamber after the exhaust gas is mixed with air may be low, resulting in a deterioration of the effect of the EGR system in reducing the amount of nitrogen oxide emissions. That is, in order to ensure the efficiency of the EGR system in reducing the amount of nitrogen oxide emissions, the temperature of the EGR system may be controlled within a reasonable range.
In the embodiment of the present application, the opening degree of the first valve may be adjusted to adjust the flow rate of the coolant for heating the EGR system, so as to control the temperature of the EGR system within a reasonable range. Specifically, the electronic control unit of the vehicle may execute S102 and S103 described below.
S102: the EGR system temperature is obtained.
In order to adjust the flow rate of the coolant heated for the EGR system, the electronic control unit of the vehicle may first determine a temperature range that maximizes the efficiency of the EGR system. Specifically, an electronic control unit of the vehicle first acquires the EGR system temperature. For example, one or more temperature sensors may be deployed in an EGR system. The temperature sensor may detect the temperature of the EGR system and send it to the electronic control unit of the vehicle.
After the EGR system temperature is obtained, the electronic control unit of the vehicle may compare the EGR system temperature to a first temperature threshold. If the EGR system temperature is less than the first temperature threshold, the EGR system is still in a cooler state. If the flow of coolant to heat the EGR system is reduced, the temperature of the EGR system may be lower and the EGR system may coke. Therefore, if the EGR system temperature is less than the first temperature threshold, the electronic control unit of the vehicle may continue to maintain the first valve in the state of maximum opening. If the EGR system temperature is greater than or equal to the first temperature threshold, the temperature of the EGR system is indicated to be relatively high. If the first valve is still kept at full-seat, which may cause the temperature of the EGR system to rise further, the efficiency of the EGR system is reduced and damaged, and therefore, if the temperature of the EGR system is greater than or equal to the first temperature threshold, the electronic control unit of the vehicle may execute S103 to control the first valve to open according to the temperature of the EGR system.
S103: the first valve opening is controlled based on the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold.
If the EGR temperature is too high, the emission reduction efficiency of the EGR system may decrease; if the EGR temperature is too low, coking of the EGR system may occur. Even if the EGR system does not suffer damage and coking, the efficiency of the EGR system may be affected and nitrogen oxides still generated during engine combustion may be present if the exhaust gas circulating in the EGR system is not maintained within a suitable range.
Therefore, after determining that the temperature of the EGR system reaches the first temperature threshold, the electronic control unit of the vehicle may determine a target valve opening degree of the first valve according to the temperature of the EGR system, and control the first valve according to the target valve opening degree of the first valve. Specifically, the electronic control system of the vehicle may calculate a target opening degree corresponding to the EGR system temperature from the target valve opening degree correspondence.
The target valve opening degree corresponding relation represents the corresponding relation between the temperature of the EGR system and the opening degree of the first valve, and comprises the target valve opening degree corresponding to the first valve under different EGR exhaust gas temperatures. In the case where the opening degree of the first valve is the target valve opening degree, the exhaust gas in the EGR system is adjusted to an exhaust gas temperature that maximizes the efficiency of the EGR system.
In some possible implementations, a plurality of opening positions of the first valve may be preset. In this way, the electronic control unit may select one opening range from among a plurality of opening ranges as the target opening range of the first valve in accordance with the EGR system temperature. For example, a plurality of opening degree shift positions including 25%, 50%, 75%, and 100% may be set, corresponding to 25% of the maximum opening degree, 50% of the maximum opening degree, 75% of the maximum opening degree, and the maximum opening degree, respectively. Accordingly, the first valve may be controlled by the switching circuit.
In some possible implementations, the electronic control unit of the vehicle may include a plurality of target valve opening degree correspondences. Each target valve corresponds to a coolant temperature. In this way, when determining the target valve opening of the first valve, the electronic control unit of the vehicle may acquire the coolant temperature and determine the target valve opening correspondence relationship based on the coolant temperature. Thus, the target valve opening degree which is matched with the coolant temperature and the EGR exhaust gas temperature to the maximum degree can be obtained, and the highest efficiency of the EGR system is ensured.
In some possible implementations, the target valve opening may be modified based on environmental factors. For example, during actual vehicle travel, the load and speed of the vehicle engine may affect the most appropriate EGR exhaust temperature. Accordingly, an electronic control unit of the vehicle may obtain vehicle engine operating parameters, including engine load and/or engine speed. Then, a target valve opening correspondence may be determined from the plurality of valve opening correspondences based on the engine operating parameters. Then, the electronic control unit determines a target valve opening corresponding to the first valve based on the target valve opening correspondence and the EGR temperature.
In addition, the target valve opening degree can be corrected according to environmental parameters such as environmental temperature and atmospheric pressure, and details are not repeated here.
In some possible implementations, if the vehicle is running for a long period of time, the EGR temperature continues to increase, resulting in cooling of the EGR system by the coolant alone, which cannot be controlled within a reasonable range. For this purpose, the electronic control unit may monitor the temperature of the cooling liquid. If the coolant temperature reaches the second water temperature threshold, the electronic control unit may reduce the coolant temperature by initiating a large cycle. That is, if the EGR system temperature is less than the first temperature threshold, the electronic control unit performs open-loop control of the first valve to maintain the first valve in the maximum opening state. If the EGR system temperature is between the first temperature threshold and the second temperature threshold, the electronic control unit performs closed-loop control of the first valve based on the EGR temperature, for example, the opening of the first valve may be controlled via a proportional-Integral-derivative (PID) control algorithm. In some possible implementations, even if the EGR system is heated by the coolant, it may not be possible to raise the temperature of the EGR system to a temperature range where emission reduction efficiency is the highest due to a problem of a vehicle running environment. In this way, the electronic control unit of the vehicle may issue a warning to the driver to inform the driver that the temperature of the EGR system is low.
The embodiment of the application provides a valve control method which is used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the parking state, the first valve may be controlled to maintain the maximum opening degree. The first valve is a coolant inlet valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, the EGR system is heated through the cooling liquid, the temperature of the EGR system can be kept in a high range, and coking caused by too low temperature of the EGR system is avoided. As the temperature of the EGR system increases during operation of the vehicle, the flow rate of coolant used to heat the EGR system may be reduced. Specifically, the EGR system temperature may be obtained and it may be determined whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be decreased appropriately. Specifically, the opening degree of the first valve may be controlled according to the EGR system temperature. That is, when the temperature of the EGR system is low, the EGR system is heated by the coolant; after the EGR system temperature rises to the first temperature threshold, the flow of coolant heating the EGR system is reduced. Thus, not only can the exhaust gas coking caused by the over-low EGR temperature be prevented, but also the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the EGR system is prevented from being broken down.
The foregoing provides some specific implementation manners of the valve control method for the embodiment of the present application, and based on this, the present application also provides a corresponding apparatus. The device provided by the embodiment of the present application will be described in terms of functional modularity.
Referring to the schematic structure of the valve control apparatus shown in fig. 2, the apparatus 200 includes an obtaining unit 210 and a control unit 220. Wherein the obtaining unit 210 is configured to obtain the EGR system temperature.
The control unit 220 is configured to control a first valve to maintain a maximum opening degree in response to a vehicle entering a working state from a parking state, where the first valve is a coolant inlet valve of an EGR system of the vehicle, and the coolant is used to raise a temperature of the EGR system.
The control unit 220 is further configured to control the opening of the first valve according to the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold.
The embodiment of the application provides a valve control device for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the parking state, the first valve may be controlled to maintain the maximum opening degree. The first valve is a coolant inlet valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, the EGR system is heated through the cooling liquid, the temperature of the EGR system can be kept in a high range, and coking caused by too low temperature of the EGR system is avoided. As the temperature of the EGR system increases during operation of the vehicle, the flow rate of coolant used to heat the EGR system may be reduced. Specifically, the EGR system temperature may be obtained and it may be determined whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be decreased appropriately. Specifically, the opening degree of the first valve may be controlled according to the EGR system temperature. That is, when the temperature of the EGR system is low, the EGR system is heated by the coolant; after the EGR system temperature rises to the first temperature threshold, the flow of coolant heating the EGR system is reduced. Thus, not only can the exhaust gas coking caused by the over-low EGR temperature be prevented, but also the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the EGR system is prevented from being broken down.
Optionally, in some possible implementations, the control unit 220 is configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening correspondence, where the target valve opening correspondence includes a correspondence between the EGR system temperature and the opening of the first valve; and controlling a first valve according to the target opening degree so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with the highest efficiency of the EGR system.
Optionally, in some possible implementations, the control unit 220 is specifically configured to obtain an engine operating parameter of the vehicle, where the engine operating parameter includes a load and/or a rotation speed of an engine of the vehicle; and determining the target valve opening corresponding relation from a plurality of valve opening corresponding relations according to the engine working parameters, wherein the plurality of valve opening corresponding relations are different in engine working parameters.
Optionally, in some possible implementations, the control unit 220 is configured to determine a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, where the target opening degree matches the EGR system temperature; and controlling the opening degree of the first valve to be the target opening degree.
The embodiment of the application also provides corresponding equipment and a computer storage medium, which are used for realizing any valve control method provided by the embodiment of the application. The device comprises a memory and a processor, wherein the memory is used for storing instructions or codes, and the processor is used for executing the instructions or codes to execute the valve control method in any embodiment of the application. The device may be, for example, an electronic control unit of a vehicle, or an electronic control unit of a vehicle, and a control circuit connected to the electronic control unit. In addition, the embodiment of the application also provides an automobile which comprises the EGR system and the controller, wherein the controller is used for realizing the valve control method provided by the embodiment of the application.
In the embodiments of the present application, the names "first" and "second" (if any) in the names "first" and "second" are used merely for name identification, and do not represent the sequential first and second.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on different points from other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only an exemplary embodiment of the present application and is not intended to limit the scope of the present application.
Claims (10)
1. A method of controlling a valve, the method comprising:
controlling a first valve to maintain a maximum opening degree in response to a vehicle entering an operating state from a parking state, wherein the first valve is a coolant inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and coolant is used for raising the temperature of the EGR system;
acquiring the temperature of the EGR system;
in response to the EGR system temperature reaching a first temperature threshold, controlling an opening of the first valve based on the EGR system temperature.
2. The method of claim 1, wherein said controlling the opening of the first valve as a function of the EGR system temperature comprises:
calculating a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relation, wherein the target valve opening corresponding relation comprises a corresponding relation between the EGR system temperature and the opening of the first valve;
and controlling a first valve according to the target opening degree so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with the highest efficiency of the EGR system.
3. The method of claim 2, wherein calculating the target opening for the EGR system temperature based on the target valve opening map comprises:
obtaining engine operating parameters of the vehicle, wherein the engine operating parameters comprise load and/or rotating speed of an engine of the vehicle;
and determining the corresponding relation of the target valve opening from the corresponding relations of a plurality of valve openings according to the working parameters of the engine, wherein the corresponding relations of the plurality of valve openings are different from the working parameters of the engine.
4. The method according to any one of claims 1-3, wherein said controlling the opening of the first valve in accordance with the EGR system temperature comprises:
determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, wherein the target opening degree is matched with the EGR system temperature;
and controlling the opening degree of the first valve to be the target opening degree.
5. A valve control apparatus, comprising:
the control unit is used for responding to the vehicle entering the working state from the parking state and controlling a first valve to keep the maximum opening degree, wherein the first valve is a coolant inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and the coolant is used for increasing the temperature of the EGR system;
an acquisition unit configured to acquire the EGR system temperature;
the control unit is further used for responding to the EGR system temperature reaching a first temperature threshold value, and controlling the opening degree of the first valve according to the EGR system temperature.
6. The apparatus of claim 5,
the control unit is specifically configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relationship, where the target valve opening corresponding relationship includes a corresponding relationship between the EGR system temperature and the opening of the first valve; and controlling a first valve according to the target opening degree so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with the highest efficiency of the EGR system.
7. The apparatus of claim 6,
the control unit is specifically used for acquiring engine operating parameters of the vehicle, wherein the engine operating parameters comprise load and/or rotating speed of an engine of the vehicle; and determining the corresponding relation of the target valve opening from the corresponding relations of a plurality of valve openings according to the working parameters of the engine, wherein the corresponding relations of the plurality of valve openings are different from the working parameters of the engine.
8. The apparatus according to any one of claims 5 to 7,
the control unit is used for determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, and the target opening degree is matched with the EGR system temperature; and controlling the opening degree of the first valve to be the target opening degree.
9. An apparatus, comprising a memory to store instructions or code and a processor to execute the instructions or code to perform the valve control method of any of claims 1-4.
10. A vehicle comprising an EGR system and a controller for controlling a first valve of the EGR system to implement the valve control method of any one of claims 1-4.
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| CN202210223990.XA CN114592991B (en) | 2022-03-07 | 2022-03-07 | Valve control method and device |
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| CN202210223990.XA CN114592991B (en) | 2022-03-07 | 2022-03-07 | Valve control method and device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202228217U (en) * | 2011-09-15 | 2012-05-23 | 潍柴动力股份有限公司 | Control equipment of EGR (exhaust gas recirculation) valve |
| CN104930257A (en) * | 2015-04-29 | 2015-09-23 | 潍柴动力股份有限公司 | Control method and device of valve |
| JP2018084222A (en) * | 2016-11-25 | 2018-05-31 | トヨタ自動車株式会社 | Control device of internal combustion engine |
| CN109083755A (en) * | 2018-09-30 | 2018-12-25 | 潍柴动力股份有限公司 | A kind of engine valve control method and device |
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2022
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202228217U (en) * | 2011-09-15 | 2012-05-23 | 潍柴动力股份有限公司 | Control equipment of EGR (exhaust gas recirculation) valve |
| CN104930257A (en) * | 2015-04-29 | 2015-09-23 | 潍柴动力股份有限公司 | Control method and device of valve |
| JP2018084222A (en) * | 2016-11-25 | 2018-05-31 | トヨタ自動車株式会社 | Control device of internal combustion engine |
| CN109083755A (en) * | 2018-09-30 | 2018-12-25 | 潍柴动力股份有限公司 | A kind of engine valve control method and device |
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