EGR valve high-temperature protection method, device and equipment and computer storage medium

Abstract

The invention relates to the technical field of range extender electronic control, and discloses an EGR valve high-temperature protection method, device and equipment and a computer storage medium. The method comprises the steps that when a direct-current motor used for controlling a target EGR valve starts to operate, the duty ratio of the direct-current motor is collected in real time; when the direct-current motor operates to the triggering moment for the first time, high-temperature protection is conducted on the target EGR valve by limiting operation of the target EGR valve; wherein the trigger time is the end time from the first operation of the direct current motor to the trigger time period, and the trigger time period is the time period when the average duty ratio exceeds a first threshold value within a preset time length. By means of the technical scheme, operation of the EGR valve can be limited by combining the duty ratio of the direct current motor of the EGR valve, and high-temperature protection of the EGR valve is achieved under the condition that extra hardware manufacturing cost is not increased.

Description

Technical Field

[0001] The present application relates to the technical field of range extender electronic control, and in particular to an EGR valve high temperature protection method, device, equipment and computer storage medium. Background Art

[0002] The exhaust gas recirculation valve (EGR valve) is mainly composed of a DC motor assembly, a sensor assembly, a gearbox reduction mechanism, an eccentric assembly, a return spring and a linear motion valve stem assembly. The main function of the EGR valve is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation. The EGR valve is directly connected to the exhaust manifold. When the EGR valve is opened, a large amount of high-temperature gas from the exhaust manifold will flow into the EGR valve, causing the temperature of the EGR valve and the EGR valve motor assembly to rise, thereby causing the risk of burning out the EGR valve.

[0003] Therefore, it is urgent to provide a technical solution to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present application provides an EGR valve high temperature protection method, device, equipment and computer storage medium, which are used to solve the problem of EGR valve and EGR valve motor assembly temperature rising in the prior art, causing the EGR valve to burn out.

[0005] According to one aspect of an embodiment of the present application, a method for protecting an EGR valve from high temperature is provided, the method comprising:

[0006] When a DC motor for controlling a target EGR valve starts to run, collecting a duty cycle of the DC motor in real time;

[0007] When the DC motor runs to the triggering moment for the first time, the target EGR valve is protected from high temperature by limiting the operation of the target EGR valve; wherein, the triggering moment is: the first time the DC motor runs to the end of the triggering period, and the triggering period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

[0008] In an optional manner, the step of obtaining the average duty cycle in any time period includes:

[0009] Based on the average duty cycle calculation formula, and in combination with the duty cycles of multiple preset moments in any period, the average duty cycle in any period is calculated; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

[0010] In an optional manner, the step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further includes:

[0011] The duty cycle of the DC motor is controlled to be not higher than a second threshold value within a first preset period after the triggering moment, so as to perform high temperature protection on the target EGR valve.

[0012] In an optional manner, the step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further includes:

[0013] When the duty cycle of the DC motor within a second preset time period after the triggering moment is higher than a second threshold, the DC motor is controlled to be turned off to perform high temperature protection on the target EGR valve, until the coil temperature of the DC motor is lower than a third threshold, and then the DC motor is controlled to operate.

[0014] In an optional manner, the method further includes:

[0015] When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0016] In an optional manner, the method further includes:

[0017] The preset time length is determined according to the ambient temperature of the DC motor.

[0018] According to another aspect of an embodiment of the present application, there is provided an EGR valve high temperature protection device, comprising:

[0019] Including: acquisition module and control module;

[0020] The acquisition module is used to: when the DC motor used to control the target EGR valve starts to run, collect the duty cycle of the DC motor in real time;

[0021] The control module is used to: when the DC motor runs for the first time to the trigger moment, limit the operation of the target EGR valve to protect the target EGR valve from high temperature; wherein the trigger moment is: the first time the DC motor runs to the end of the trigger period, and the trigger period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

[0022] In an optional manner, the device further includes: a calculation module;

[0023] The calculation module is used to calculate the average duty cycle in any time period based on the average duty cycle calculation formula and in combination with the duty cycles at multiple preset moments in any time period; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

[0024] According to another aspect of an embodiment of the present application, there is provided an EGR valve high temperature protection device, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other through the communication bus;

[0025] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform the operation of the EGR valve high temperature protection method of the present invention.

[0026] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein at least one executable instruction is stored in the storage medium, and the executable instruction enables the EGR valve high temperature protection device / equipment to perform operations such as the EGR valve high temperature protection method of the present invention.

[0027] The embodiment of the present application collects the duty cycle of the DC motor for controlling the target EGR valve in real time when the DC motor starts to run; when the DC motor runs to the triggering moment for the first time, the operation of the target EGR valve is limited to protect the target EGR valve from high temperature. The operation of the EGR valve can be limited in combination with the duty cycle of the DC motor of the EGR valve, thereby realizing high temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0028] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0030] Figure 1 A schematic flow chart of a first embodiment of the EGR valve high temperature protection method provided by the present application is shown;

[0031] Figure 2A schematic flow chart of a second embodiment of the EGR valve high temperature protection method provided by the present application is shown;

[0032] Figure 3 A schematic flow chart of a second embodiment of the EGR valve high temperature protection method provided by the present application is shown;

[0033] Figure 4 A schematic structural diagram of an embodiment of an EGR valve high temperature protection device provided by the present application is shown;

[0034] Figure 5 A schematic structural diagram of an embodiment of the EGR valve high temperature protection device provided in the present application is shown. DETAILED DESCRIPTION

[0035] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0036] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0037] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0038] The term "multiple" as used in this application refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0039] The main function of the EGR valve is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation. The EGR valve is directly connected to the exhaust manifold. When the EGR valve is opened, a large amount of high-temperature gas from the exhaust manifold will flow into the EGR valve, causing the temperature of the EGR valve and the EGR valve motor components to rise, thereby causing the risk of burning out the EGR valve. Based on this:

[0040] Figure 1 The flowchart of the first embodiment of the EGR valve high temperature protection method provided by the present application is shown, and the method is executed by the ECU. Figure 1 As shown, the method comprises the following steps:

[0041] 5. The method according to claim 4, characterized in that the method further comprises:

[0042] When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0043] 6. The method according to any one of claims 1 to 5, characterized in that the method further comprises:

[0044] Determine the preset time according to the ambient temperature of the DC motor

[0045] Step S110: When the DC motor for controlling the target EGR valve starts to run, the duty cycle of the DC motor is collected in real time.

[0046] Among them, the target EGR valve is the EGR valve that needs to be protected from high temperature in this embodiment. The DC motor is the DC motor set on the target EGR valve. The duty cycle refers to the time ratio t1 / T occupied by the high level in one cycle (t1 refers to the duration of the high level, and T refers to the time required for the voltage to complete a pulse change). The duty cycle of the EGR valve is controlled by the ECU. The ECU controls the opening of the EGR valve by adjusting the duty cycle. The larger the duty cycle, the larger the opening of the EGR valve. The ECU can determine the duty cycle of the DC motor by collecting the opening of the EGR valve.

[0047] Step S120: When the DC motor runs to the triggering moment for the first time, the operation of the target EGR valve is restricted to protect the target EGR valve from high temperature.

[0048] Among them, the triggering moment is: the time from the first operation of the DC motor to the end of the triggering period, and the triggering period is: the period during which the average duty cycle within the preset time exceeds the first threshold. The preset time defaults to 5s, and the first threshold can be determined based on the experimental test results (such as 0.45), and there is no limit here. If the average duty cycle exceeds the first threshold, there is a risk of motor burnout. Ways to limit the operation of the target EGR valve include but are not limited to: using the ECU to control the DC motor of the EGR valve to stop running, or reducing the duty cycle of the DC motor, etc.

[0049] In step S210, the process of obtaining the average duty cycle in any period includes:

[0050] Based on the average duty cycle calculation formula and in combination with the duty cycles at multiple preset moments in any time period, the average duty cycle in any time period is calculated.

[0051] The average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset time in any time period. For example, when the time period is 5s, if the sampling rate of the time period is 5ms / per time period, then N x =1000; if the sampling rate of the time period is 10ms / per time period, then N x =500.

[0052] The technical solution of this embodiment can limit the operation of the EGR valve in combination with the duty cycle of the DC motor of the EGR valve, thereby achieving high temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0053] Figure 2 The flowchart of the second embodiment of the EGR valve high temperature protection method provided by the present application is shown, and the method is executed by the ECU. Figure 2 As shown, the method comprises the following steps:

[0054] Step S210: When the DC motor for controlling the target EGR valve starts to run, the duty cycle of the DC motor is collected in real time.

[0055] Step S220: When the DC motor runs to the triggering moment for the first time, the duty cycle of the DC motor is controlled to be not higher than a second threshold value within a first preset period after the triggering moment, so as to perform high temperature protection on the target EGR valve.

[0056] Among them, the duration of the first preset period is 30 minutes by default, and the second threshold value can be set according to the actual situation and is not limited here. The higher the duty cycle of the DC motor, the higher the temperature of the target EGR valve. The ECU reduces the temperature of the target EGR valve by reducing the opening of the target EGR valve and the duty cycle of the DC motor of the EGR valve, thereby achieving high-temperature protection for the target EGR valve. For example, when the DC motor runs to the triggering moment for the first time, the ECU controls the duty cycle of the DC motor within 30 minutes after the triggering moment to be no higher than the second threshold value, so as to protect the target EGR valve from high temperature.

[0057] The technical solution of this embodiment further controls the duty cycle of the DC motor of the EGR valve through the ECU, thereby achieving high-temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0058] Figure 3 The flowchart of the third embodiment of the EGR valve high temperature protection method provided by the present application is shown, and the method is executed by the ECU. Figure 3 As shown, the method comprises the following steps:

[0059] Step S310: When the DC motor for controlling the target EGR valve starts to run, the duty cycle of the DC motor is collected in real time.

[0060] Step S320: When the DC motor runs to the triggering moment for the first time, and when the duty cycle of the DC motor in a second preset time period after the triggering moment is higher than a second threshold, the DC motor is controlled to be turned off to perform high temperature protection on the target EGR valve, until the coil temperature of the DC motor is lower than a third threshold, and then the DC motor is controlled to run.

[0061] Among them, the duration of the second preset period is 5 minutes by default, and can also be set according to actual conditions, without setting any restrictions here. The ECU detects whether there is a duty cycle higher than the second threshold value in this period within 5 minutes after the trigger moment. If so, the period is determined as the second preset period. For example, when the DC motor runs to the trigger moment for the first time, the ECU detects whether there is a duty cycle higher than the second threshold value in this period within 5 minutes after the trigger moment. The third threshold is 150°C by default, and can also be set according to actual conditions, without setting any restrictions here.

[0062] The technical solution of this embodiment further controls the start and stop of the EGR valve according to the duty cycle of the DC motor of the EGR valve, thereby achieving high-temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0063] In an optional manner, step S320 further includes:

[0064] When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0065] When the duty cycle of the DC motor of the target EGR valve within the second preset time period at the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0066] Based on any of the above embodiments, the present invention further includes:

[0067] The preset time length is determined according to the ambient temperature of the DC motor.

[0068] Among them, through experimental testing and combining the current of the DC motor and the ambient temperature of the DC motor, the maximum continuous power-on time that the DC motor can withstand, that is, the preset time, is determined.

[0069] Figure 4 The schematic diagram of the structure of the embodiment of the EGR valve high temperature protection device provided by the present application is shown. Figure 4 As shown, the device 400 includes: a collection module 410 and a control module 420.

[0070] The acquisition module 410 is used to: when the DC motor used to control the target EGR valve starts to run, collect the duty cycle of the DC motor in real time;

[0071] The control module 420 is used to: when the DC motor runs for the first time to the trigger moment, limit the operation of the target EGR valve to protect the target EGR valve from high temperature; wherein the trigger moment is: the first time the DC motor runs to the end of the trigger period, and the trigger period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

[0072] In an optional manner, the device 400 further includes: a calculation module;

[0073] The calculation module is used to calculate the average duty cycle in any time period based on the average duty cycle calculation formula and in combination with the duty cycles at multiple preset moments in any time period; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

[0074] In an optional manner, the control module 420 is specifically used to:

[0075] The step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further comprises:

[0076] The duty cycle of the DC motor is controlled to be not higher than a second threshold value within a first preset period after the triggering moment, so as to perform high temperature protection on the target EGR valve.

[0077] In an optional manner, the control module 420 is specifically used to:

[0078] When the duty cycle of the DC motor within a second preset time period after the triggering moment is higher than a second threshold, the DC motor is controlled to be turned off to perform high temperature protection on the target EGR valve, until the coil temperature of the DC motor is lower than a third threshold, and then the DC motor is controlled to operate.

[0079] In an optional manner, the device 400 further includes: a maintaining module; the maintaining module is used to:

[0080] When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0081] In an optional manner, the device 400 further includes: a preprocessing module; the preprocessing module is used to:

[0082] The preset time length is determined according to the ambient temperature of the DC motor.

[0083] The technical solution of this embodiment can limit the operation of the EGR valve in combination with the duty cycle of the DC motor of the EGR valve, thereby achieving high temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0084] It should be noted that the EGR valve high temperature protection device provided in the above embodiment and the EGR valve high temperature protection method provided in the aforementioned embodiment belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiment and will not be repeated here.

[0085] Figure 5 A structural schematic diagram of an embodiment of the EGR valve high temperature protection device provided in the present application is shown, which shows a structural schematic diagram of a computer system suitable for implementing the EGR valve high temperature protection device of the embodiment of the present application. The specific embodiment of the present application does not limit the specific implementation of the EGR valve high temperature protection device.

[0086] See also Figure 5 As shown, the EGR valve high temperature protection device includes: a controller; a memory for storing one or more programs, when the one or more programs are executed by the controller, the above-mentioned EGR valve high temperature protection method is executed.

[0087] Please continue reading Figure 5As shown, the computer system 500 of the EGR valve high temperature protection device includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503, such as executing the method in the above embodiment. In the RAM 503, various programs and data required for system operation are also stored. The CPU 501, the ROM 502 and the RAM 503 are connected to each other through the bus 504. The input / output (I / O) interface 505 is also connected to the bus 504.

[0088] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0089] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 509, and / or installed from a removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0090] Another aspect of the present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the EGR valve high temperature protection method described above is implemented. The computer-readable storage medium may be included in the EGR valve high temperature protection device described in the above embodiment, or may exist independently without being assembled into the electronic device.

[0091] Another aspect of the present application also provides a computer program product or computer program, which includes at least one executable instruction. When the executable instruction is run on the EGR valve high temperature protection device / equipment, the EGR valve high temperature protection device / equipment executes the EGR valve high temperature protection method as described above.

[0092] The executable instructions may be specifically used to enable the EGR valve high temperature protection device / apparatus to perform the following operations:

[0093] When a DC motor for controlling a target EGR valve starts to run, collecting a duty cycle of the DC motor in real time;

[0094] When the DC motor runs to the triggering moment for the first time, the target EGR valve is protected from high temperature by limiting the operation of the target EGR valve; wherein, the triggering moment is: the first time the DC motor runs to the end of the triggering period, and the triggering period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

[0095] In an optional manner, the step of obtaining the average duty cycle in any time period includes:

[0096] Based on the average duty cycle calculation formula, and in combination with the duty cycles of multiple preset moments in any period, the average duty cycle in any period is calculated; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

[0097] In an optional manner, the step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further includes:

[0098] The duty cycle of the DC motor is controlled to be not higher than a second threshold value within a first preset period after the triggering moment, so as to perform high temperature protection on the target EGR valve.

[0099] In an optional manner, the step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further includes:

[0100] When the duty cycle of the DC motor within a second preset time period after the triggering moment is higher than a second threshold, the DC motor is controlled to be turned off to perform high temperature protection on the target EGR valve, until the coil temperature of the DC motor is lower than a third threshold, and then the DC motor is controlled to operate.

[0101] In an optional manner, the method further includes:

[0102] When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

[0103] In an optional manner, the method further includes:

[0104] Determine the preset time according to the ambient temperature of the DC motor

[0105] The technical solution of this embodiment can limit the operation of the EGR valve in combination with the duty cycle of the DC motor of the EGR valve, thereby achieving high temperature protection of the EGR valve without increasing additional hardware manufacturing costs.

[0106] It should be noted that the computer-readable medium shown in the embodiment of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, wherein a computer-readable computer program is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0107] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0108] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0109] According to one aspect of an embodiment of the present application, a computer system is also provided, including a central processing unit (CPU), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage portion into a random access memory (RAM), such as executing the method in the above embodiment. In RAM, various programs and data required for system operation are also stored. CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0110] The following components are connected to the I / O interface: an input part including a keyboard, a mouse, etc.; an output part including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage part including a hard disk, etc.; and a communication part including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that the computer program read therefrom is installed into the storage part as needed.

[0111] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A method for protecting an EGR valve from high temperature, characterized in that: include: When a DC motor for controlling a target EGR valve starts to run, collecting a duty cycle of the DC motor in real time; When the DC motor runs to the triggering moment for the first time, the target EGR valve is protected from high temperature by limiting the operation of the target EGR valve; wherein, the triggering moment is: the first time the DC motor runs to the end of the triggering period, and the triggering period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

2. The method according to claim 1, characterized in that The steps to obtain the average duty cycle in any period of time include: Based on the average duty cycle calculation formula, and in combination with the duty cycles of multiple preset moments in any period, the average duty cycle in any period is calculated; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

3. The method according to claim 1, characterized in that The step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further comprises: The duty cycle of the DC motor is controlled to be not higher than a second threshold value within a first preset period after the triggering moment, so as to perform high temperature protection on the target EGR valve.

4. The method according to claim 1, characterized in that The step of protecting the target EGR valve from high temperature by limiting the operation of the target EGR valve further comprises: When the duty cycle of the DC motor within a second preset time period after the triggering moment is higher than a second threshold, the DC motor is controlled to be turned off to perform high temperature protection on the target EGR valve, until the coil temperature of the DC motor is lower than a third threshold, and then the DC motor is controlled to operate.

5. The method according to claim 4, characterized in that The method further comprises: When the duty cycle of the DC motor in the second preset time period after the triggering moment is not higher than the second threshold, the operation of the DC motor is maintained.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: The preset time length is determined according to the ambient temperature of the DC motor.

7. An EGR valve high temperature protection device, characterized in that: include: Acquisition module and control module; The acquisition module is used to: when the DC motor used to control the target EGR valve starts to run, collect the duty cycle of the DC motor in real time; The control module is used to: when the DC motor runs for the first time to the trigger moment, limit the operation of the target EGR valve to protect the target EGR valve from high temperature; wherein the trigger moment is: the first time the DC motor runs to the end of the trigger period, and the trigger period is: the period during which the average duty cycle within a preset time period exceeds a first threshold.

8. The device according to claim 7, characterized in that The device further comprises: a calculation module; The calculation module is used to calculate the average duty cycle in any time period based on the average duty cycle calculation formula and in combination with the duty cycles at multiple preset moments in any time period; wherein the average duty cycle calculation formula is: is the average duty cycle in any period, N x is the number of preset moments in any period, |DC n | is the absolute value of the duty cycle at the nth preset moment in any time period.

9. An EGR valve high temperature protection device, characterized in that: include: Controller; A memory for storing one or more programs, when the one or more programs are executed by the controller, the controller implements the EGR valve high temperature protection method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one executable instruction. When the executable instruction runs on the EGR valve high temperature protection device / equipment, the EGR valve high temperature protection device / equipment performs the operation of the EGR valve high temperature protection method as described in any one of claims 1-6.

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