PID (Proportion Integration Differentiation) dynamic closed-loop control method and system for electric main water pump of engine

Abstract

The invention provides a PID (Proportion Integration Differentiation) dynamic closed-loop control method and system for an electric main water pump of an engine, and belongs to the technical field of vehicles. Heating requests and the starting state of the engine are judged firstly, engine waste heat utilization is accurately triggered according to scenes, and heating requirements are controlled based on water temperature economy / reliability / heating requirements; a core control target is determined by taking maximum logic, and then PID closed-loop water temperature correction, water pump rotating speed increasing and decreasing rate control and complete closed-loop control formed by an operation module after shutdown are performed, so that dynamic management of the engine electric main water pump under all working conditions and according to priorities is realized, the water temperature control precision and response speed under different scenes are guaranteed, and the control accuracy of the engine electric main water pump is improved. And the limitation of single control logic is avoided through module cooperation, and the comprehensive advantages of improving the economical efficiency and reliability of the engine and the running comfort of the whole vehicle are finally achieved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a PID dynamic closed-loop control method and control system for an engine electric main water pump. Background Technology

[0002] In the existing technology, there are various methods for controlling engine water pumps. One such method (application number: 202010559724.5) uses open-loop control to calculate the engine water pump speed based on water temperature and engine load. Although this open-loop control method has a relatively simple structure, it has obvious shortcomings.

[0003] In actual operation, open-loop control cannot dynamically adjust according to real-time changes in water temperature. For example, when the ambient temperature changes suddenly or the engine load fluctuates drastically, the water pump speed set by the open-loop control cannot respond to these changes in time, which may lead to excessively high or low engine water temperature. Excessively high water temperature will affect the engine's lifespan and may even cause malfunctions; excessively low water temperature will increase fuel consumption and reduce engine efficiency. Furthermore, open-loop control struggles to balance multiple needs such as engine economy, reliability, and heating, resulting in poor adaptability under complex operating conditions. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a PID dynamic closed-loop control method and control system for an electric main water pump of an engine.

[0005] In a first aspect, embodiments of the present invention provide a PID dynamic closed-loop control method for an engine's electric main water pump.

[0006] Determine if a heating request exists;

[0007] When there is a heating request and the engine starts, the main water pump speed is calculated based on water temperature economy, reliability and heating demand, and the main water pump is controlled to work at the maximum pump speed among the three factors. The water temperature is also corrected through PID closed-loop control.

[0008] When there is no heating request and the engine is started, the main water pump speed is calculated based on water temperature economy and reliability, and the main water pump is controlled to operate at the maximum speed of the two, and the water temperature is corrected through PID closed-loop control.

[0009] Optionally, the main water pump operating mode based on water temperature economy includes:

[0010] After the engine starts, control the main water pump to run at a set speed for a certain period of time;

[0011] When the ECU detects that the water temperature is less than T1, the main water pump runs at the minimum speed.

[0012] When the ECU detects that the water temperature is within the temperature range of T1 and T2, it determines the main water pump speed by looking up a table based on the engine load and speed through the pre-stored first mapping relationship.

[0013] When the ECU detects that the water temperature is greater than T3, the main water pump operates at maximum speed. When the water temperature drops below T2, it exits the maximum speed operation state.

[0014] Optionally, the reliability-based pump operation mode includes:

[0015] When the EGR system is started, the corresponding main water pump speed is obtained by looking up the table through the pre-stored second mapping relationship according to the EGR flow requirements under each operating condition.

[0016] Based on the water temperature and engine load, the main water pump speed is determined by looking up a table using a pre-stored third mapping relationship.

[0017] Optionally, the main water pump operating mode based on heating demand includes:

[0018] Based on the required airflow, the main water pump speed is obtained by looking up a table using a pre-stored fourth mapping relationship.

[0019] Optionally, the PID closed-loop control for correcting the water temperature includes:

[0020] Item P is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. The parameters of item P are obtained by looking up the engine coolant temperature table.

[0021] Item I is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. The parameters in Item I are calibrated by looking up the engine coolant temperature table.

[0022] Item D is calculated based on the actual engine coolant temperature change rate, and the parameters in Item D are calibrated by looking up the engine coolant temperature table.

[0023] Calculate the increase or decrease of the sum of items P, I, and D to obtain the increase or decrease requirement of the main water pump;

[0024] Based on the increase or decrease in the main water pump's demand, the actual speed increment of the main water pump is obtained.

[0025] Optionally, when there is a heating request and the engine is not started, the main water pump speed is controlled based on the temperature difference between the air conditioning set temperature and the vehicle interior temperature.

[0026] Optionally, after shutdown, if the engine coolant temperature is higher than the first set temperature, the engine speed will be kept at a delayed rate and shut off immediately upon power-off.

[0027] If the engine coolant temperature is lower than the first set temperature, maintain the set duty cycle and shut off after a second delay.

[0028] Optionally, during operation, the main water pump speed increase / decrease rate is controlled based on NVH requirements and cooling needs.

[0029] Secondly, embodiments of the present invention also provide a PID dynamic closed-loop control system for an engine electric main water pump, configured to implement the above-mentioned control method, including:

[0030] The judgment module is used to determine whether there is a heating request and whether the engine is started;

[0031] The calculation module is used to calculate the main water pump speed based on water temperature economy, reliability, and heating demand when there is a heating request and the engine is started; and to calculate the main water pump speed based on water temperature economy and reliability when there is no heating request and the engine is started.

[0032] The control module controls the main water pump to operate at the maximum pump speed based on the calculation results.

[0033] Thirdly, embodiments of the present invention also provide an electronic device, comprising:

[0034] One or more processors;

[0035] Memory, used to store one or more programs;

[0036] When the one or more programs are executed by the one or more processors, the one or more processors perform the steps of the above method.

[0037] This invention provides a PID dynamic closed-loop control method for an engine electric main water pump. By first determining the heating request and engine start status, it accurately triggers and calculates the water pump speed based on water temperature economy, reliability, heating demand, and PID closed-loop water temperature correction in different scenarios. The water pump's operating mode is determined by the logic of taking the maximum value of the water pump speed. This achieves dynamic management of the engine electric main water pump under all operating conditions and with different priorities. It not only ensures the water temperature control accuracy and response speed in different scenarios, but also avoids the limitations of a single control logic through module collaboration. Ultimately, it achieves the comprehensive benefits of improving engine economy, reliability, and overall vehicle operating comfort. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the thermal management system for a hybrid vehicle provided in an embodiment of the present invention.

[0039] Figure 2 A priority flowchart for the PID dynamic closed-loop control method of the engine electric main water pump provided in an embodiment of the present invention;

[0040] Figure 3A schematic diagram of a PID dynamic closed-loop control system for an electric main water pump of an engine provided in an embodiment of the present invention;

[0041] Figure 4 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0043] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0044] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0045] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0046] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0047] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0048] This invention provides a PID dynamic closed-loop control method for an engine electric main water pump, mainly targeting... Figure 1 The main water pump (Pump_E) in the disclosed schematic diagram of the thermal management system for hybrid vehicles provides an effective control strategy. Specifically, in this embodiment, the main water pump has four operating modes: based on water temperature economic considerations, based on reliability considerations, based on heating demand considerations, and based on PID (proportional-integral-derivative) closed-loop control to correct water temperature considerations.

[0049] See Figure 2 This includes the following steps:

[0050] First, determine if there is a heating request. For gasoline vehicles, the main consideration for heating requests is the air conditioning and heating of the passenger compartment, while for hybrid vehicles, it includes both the air conditioning and heating of the passenger compartment and battery heating.

[0051] After determining that there is a heating request, it is also necessary to determine whether the engine is started. When the engine is started, the pump speed of the main water pump is calculated in advance for various main water pump operating modes. The various main water pump operating modes include those based on water temperature economy, reliability, and heating demand. The pump speed under the three operating modes is compared, and the main water pump is controlled to operate in the mode with the highest pump speed. The water temperature is corrected through PID closed-loop control.

[0052] When it is determined that there is no heating request, it is also necessary to determine whether the engine is started. When the engine is started, the pump speed of various main water pump operating modes is calculated in advance. These various main water pump operating modes include those based on water temperature economy considerations and those based on reliability considerations. The pump speed under the two operating modes is compared, and the main water pump is controlled to operate in the mode with the highest pump speed. The water temperature is corrected through PID closed-loop control.

[0053] In one embodiment, when a heating request is detected and the engine is not started (mainly for hybrid vehicles), the waste heat of the engine can be used, and the main water pump speed can be controlled according to the temperature difference between the air conditioning set temperature and the vehicle interior temperature.

[0054] Specifically, when a heating request is confirmed in the passenger compartment, if the engine is not running and the coolant temperature is greater than 50°C (TBD), the main water pump speed will be adjusted according to the air conditioning set temperature. With the temperature inside the car The temperature difference is used for control; in addition, the load of the electric water pump can also be controlled based on the temperature difference. For example, when the temperature difference is greater than 5℃, the electric water pump operates at 93% load, and when the temperature difference is less than 4℃, the electric water pump operates at 50% load.

[0055] The operating modes of the main water pump based on water temperature economy include:

[0056] After the engine starts, the main water pump is controlled to run at a set speed for a certain period of time; and a water temperature sensor is used to detect the water temperature to avoid inaccurate water temperature detection.

[0057] In the first stage, the ECU (electronic control unit) detects that the water temperature is less than T1 (e.g., 90°C), and the main water pump operates at the minimum speed;

[0058] In the second stage, T1 (e.g., 90℃) ≤ ECU detected water temperature ≤ T2 (e.g., 112℃), the main water pump speed is determined by looking up a table based on the engine load and speed through the pre-stored first mapping relationship;

[0059] In the third stage, the ECU detects that the water temperature is greater than T3 (e.g., 114°C), and the main water pump operates at maximum speed. When the water temperature drops below T2 (e.g., 112°C), it exits the maximum flow operation state.

[0060] In this embodiment, the first mapping relationship mainly refers to the correspondence between load and main water pump speed. Here, the load is calculated based on water temperature economy considerations, taking into account the combined engine load and speed within the temperature range T1 and T2. This mapping relationship is based on the actual vehicle calibration load and main water pump speed, and is pre-stored. Therefore, when water temperature economy needs to be considered, and when the ECU detects that the water temperature is between T1 and T2, the current engine load is calculated, and the corresponding main water pump speed is read from the first mapping relationship based on this load.

[0061] The operating modes of the main water pump based on reliability include:

[0062] When the EGR system (exhaust gas recirculation system) is turned on, the corresponding main water pump speed is obtained by looking up the table through the pre-stored second mapping relationship according to the EGR flow requirements under each operating condition.

[0063] When the EGR system is not activated, the main water pump speed is determined by looking up a table based on the water temperature and engine load using a pre-stored third mapping relationship.

[0064] In this embodiment, both the second and third mapping relationships are based on the correspondence between load and main water pump speed under corresponding operating conditions, considering reliability. Specifically, the second mapping relationship is based on reliability considerations, and when the EGR system is activated, the engine load is calculated according to the EGR system's flow requirements under each operating condition. This is based on the mapping relationship between the actual vehicle's calibrated load and the main water pump speed, and this second mapping relationship is pre-stored. Therefore, when reliability needs to be considered, and when the EGR system is activated, the current engine load is calculated, and the corresponding main water pump speed is read from the second mapping relationship based on this load.

[0065] Similarly, the third mapping relationship, based on reliability considerations, calculates the engine load at different coolant temperatures and the mapping relationship between the actual vehicle's calibrated load and the main water pump speed when the EGR system is not activated, and pre-stores this third mapping relationship. Therefore, when reliability needs to be considered, and when the EGR system is not activated, the engine load at the current coolant temperature is calculated, and the corresponding main water pump speed is read from the third mapping relationship based on this load.

[0066] The operating modes of water pumps based on heating demand include:

[0067] Based on the required airflow, the main water pump speed is obtained by looking up the table using the pre-stored fourth mapping relationship.

[0068] In this embodiment, the third mapping relationship is also a mapping relationship between load and main water pump speed. Specifically, when considering the heating air flow requirement, the engine load for different heating air flow rates is first calculated, and the mapping relationship between this load and main water pump speed is calibrated based on the actual vehicle. This fourth mapping relationship is then pre-stored. Therefore, when heating demand needs to be considered, the engine load corresponding to the current heating air flow rate is calculated, and the corresponding main water pump speed is read from the fourth mapping relationship based on this load.

[0069] The operating methods for correcting water temperature based on PID closed-loop control include:

[0070] The P-term (proportional unit) is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. The parameters for the P-term are obtained through engine coolant temperature lookup table calibration, for example:

[0071]

[0072] The table above lists the engine coolant temperature. (70-120℃) Parameters P for each temperature The correspondence.

[0073] Item I is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. Item I parameters are obtained through engine coolant temperature lookup table calibration, for example:

[0074]

[0075] The table above lists the engine coolant temperature. (70-120℃) Parameters for each temperature (Item I) The correspondence.

[0076] Option D is calculated based on the actual rate of change of engine coolant temperature. The parameters in option D are obtained by looking up and calibrating the engine coolant temperature table, for example:

[0077]

[0078] The table above lists the engine coolant temperature. (70-120℃) Parameters in section D for each temperature The correspondence.

[0079] When controlling the main water pump speed, the incremental demand of the main water pump is calculated. At this time, it is necessary to first limit its range and determine the upper limit. and lower limit And because Since it is related to the actual coolant temperature of the engine, the corresponding coolant temperature can be obtained by looking up a table. or The details are shown in the table below:

[0080]

[0081]

[0082] Based on the table above, the incremental demand of the main water pump can be calculated using the formula P + I + D. , in the above table All values ​​are absolute; positive values ​​indicate an increase in temperature, while negative values ​​indicate a decrease. (This can be achieved by setting...) The upper and lower limits, especially the upper limit, can limit the temperature change range of the engine speed during PID adjustment, avoiding excessive increases or decreases that would generate large noise, affect NVH, and also affect water temperature fluctuations.

[0083] In addition, the actual speed increment of the main water pump is pre-designed. Incremental demand for main water pump The relationship table allows you to query the calculated incremental demand of the main water pump. The corresponding actual speed increment of the main water pump Specifically, the relationship table is shown below:

[0084]

[0085] In one embodiment, after shutdown, the engine coolant temperature is detected, and the main water pump operation mode is controlled according to the engine coolant temperature. Specifically:

[0086] When the engine coolant temperature is >115℃, the engine will be shut off after a 60-second delay while the power is off. During the delay, the coolant temperature will be monitored in real time. If the coolant temperature drops below 105℃ within 30 seconds, the engine will shut off in advance.

[0087] If the engine coolant temperature is ≤115℃, maintain a 20% duty cycle and shut down after a 30-second delay.

[0088] In one embodiment, when the main water pump operates using the above-described operating modes, the rate of increase and decrease of the main water pump's speed needs to be controlled. In a preferred embodiment, the rate of increase and decrease of the main water pump's speed is calibrated based on the actual vehicle to ensure that both NVH requirements and cooling needs are met, and is limited according to a table referencing the engine coolant temperature. Specifically, the upper limit of the main water pump's rate of increase and decrease is... Lower limit of the rate of increase and decrease of the main water pump speed The relationship between engine coolant temperature and engine coolant temperature is shown in the table below:

[0089]

[0090]

[0091] In this invention, the operating conditions are mainly divided into three types: heating request and engine start, heating request and engine not start, and no heating request and engine start. Based on these three different operating conditions, different main water pump transfer control methods are adopted for each:

[0092] When a heating request is requested and the engine starts, the main water pump speed is calculated based on water temperature economy, reliability, and heating demand. The engine operates in a manner corresponding to the maximum water pump speed. For example, when the water pump speed calculated based on water temperature economy is at its maximum, the engine uses water temperature economy as the main reference indicator and controls the main water pump speed in this way, while also using PID closed-loop control to correct the water temperature.

[0093] When a heating request is requested but the engine is not started, the main water pump speed is adjusted according to the air conditioning set temperature. With the temperature inside the car Temperature difference is used for control.

[0094] When there is a heating request but the engine is not started, the main water pump speed is calculated based on water temperature economy and reliability, and the pump operates in the manner corresponding to the maximum water pump speed. For example, when the water pump speed calculated based on reliability is the maximum, the engine uses reliability as the main reference indicator and controls the main water pump speed in this way, while combining PID closed-loop control to correct the water temperature.

[0095] Based on the same inventive concept, see [link to inventive concept] Figure 3The present invention also provides a PID dynamic closed-loop control system for an engine electric main water pump, which is configured to implement the above-described control method, specifically including:

[0096] The judgment module is used to determine whether there is a heating request and whether the engine is started;

[0097] The calculation module is used to calculate the main water pump speed based on water temperature economy, reliability, and heating demand when there is a heating request and the engine is started; and to calculate the main water pump speed based on water temperature economy and reliability when there is no heating request and the engine is started.

[0098] The control module controls the main water pump to operate at the maximum pump speed based on the calculation results.

[0099] In this embodiment of the invention, based on the main water pump speed control method, the control module has several sub-modules, specifically:

[0100] The water temperature economic control module controls the speed of the main water pump based on water temperature economics.

[0101] The reliability control module controls the speed of the main water pump based on reliability.

[0102] The heating demand control module controls the speed of the main water pump based on heating demand.

[0103] In a preferred embodiment of the invention, a PID closed-loop water temperature correction module is added to perform PID closed-loop control on the main water pump to correct the water temperature. For example, under high vehicle speed conditions, the engine water temperature is stably maintained at around 83°C, which is not fuel-efficient. The PID closed-loop water temperature correction module can correct the water temperature based on the operating conditions through a PID dynamic closed-loop control strategy.

[0104] In this invention, when the judgment module determines that a heating request exists and the engine is started, the calculation module can calculate the main water pump speed for the corresponding operating condition based on the water temperature economy control module, the reliability control module, and the heating demand control module, and calculate the maximum speed of the main water pump among the three. Conversely, when the judgment module determines that no heating request exists and the engine is started, the calculation module can calculate the main water pump speed for the corresponding operating condition based on the water temperature economy control module and the reliability control module, and calculate the maximum speed of the main water pump among the two. The control module can then control the main water pump speed in a corresponding manner based on the calculation results of the calculation module.

[0105] In one embodiment, the control system further includes an engine waste heat utilization control module, which is used to start working when the judgment module determines that there is a heating request and the engine is not started, so as to utilize the engine's waste heat, and at the same time control the main water pump speed according to the temperature difference between the air conditioning set temperature and the vehicle interior temperature.

[0106] Based on this, the control system provided in this embodiment can achieve fuel consumption optimization, fuel saving in heating demand conditions, and utilization of engine waste heat without increasing hardware costs.

[0107] The control system provided in this embodiment of the invention further includes a shutdown operation module, a water pump speed increase / decrease rate control module, and a failure protection module. Wherein:

[0108] The shutdown operation module is used to control the main water pump to work according to the engine water temperature after shutdown. For example, when the engine water temperature is >115℃, the pump will maintain its speed for 60 seconds after power-off and then shut down. During the delay, the water temperature will be monitored in real time. If the water temperature drops below 105℃ within 30 seconds, the pump will shut down in advance.

[0109] If the engine coolant temperature is ≤115℃, maintain a 20% duty cycle and shut down after a 30-second delay.

[0110] The water pump speed increase / decrease rate control module is used to control the speed increase / decrease rate of the main water pump during operation, ensuring that both NVH requirements and cooling needs are met, and can be limited based on the engine water temperature.

[0111] The failure protection module is used to control the main water pump's operation via PWM (Pulse Width Modulation) according to the type of emergency operation during emergency operation. Emergency operations of the main water pump include over-temperature, over-current, over-pressure, stall, and dry running, and the failure protection module can identify and diagnose each of these emergency operations.

[0112] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 4 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 4 As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, enable the one or more processors to implement a PID dynamic closed-loop control method for any of the above embodiments of an electric main water pump; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0113] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0114] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0115] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0116] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of the PID dynamic closed-loop control method for any of the above embodiments of the engine electric main water pump. The computer-readable storage medium can be volatile or non-volatile.

[0117] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described PID dynamic closed-loop control method for the electric main water pump of the engine.

[0118] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0119] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0120] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0121] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0122] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0123] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0124] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0125] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0126] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0127] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A PID dynamic closed-loop control method for an engine electric main water pump, characterized in that, Determine if a heating request exists; When there is a heating request and the engine starts, the main water pump speed is calculated based on water temperature economy, reliability and heating demand, and the main water pump is controlled to work at the maximum pump speed among the three factors. The water temperature is also corrected through PID closed-loop control. When there is no heating request and the engine is started, the main water pump speed is calculated based on water temperature economy and reliability, and the main water pump is controlled to operate at the maximum speed of the two, and the water temperature is corrected through PID closed-loop control.

2. The control method according to claim 1, characterized in that, The main water pump operating mode based on water temperature economy includes: After the engine starts, control the main water pump to run at a set speed for a certain period of time; When the ECU detects that the water temperature is less than T1, the main water pump runs at the minimum speed. When the ECU detects that the water temperature is within the temperature range of T1 and T2, it determines the main water pump speed by looking up a table based on the engine load and speed through the pre-stored first mapping relationship. When the ECU detects that the water temperature is greater than T3, the main water pump operates at maximum speed. When the water temperature drops below T2, it exits the maximum speed operation state.

3. The control method according to claim 1, characterized in that, The reliability-based water pump operation mode includes: When the EGR system is started, the corresponding main water pump speed is obtained by looking up the table through the pre-stored second mapping relationship according to the EGR flow requirements under each operating condition. Based on the water temperature and engine load, the main water pump speed is determined by looking up a table using a pre-stored third mapping relationship.

4. The control method according to claim 1, characterized in that, The main water pump operating mode based on heating demand includes: Based on the required airflow, the main water pump speed is obtained by looking up a table using a pre-stored fourth mapping relationship.

5. The control method according to claim 1, characterized in that, The PID closed-loop control for correcting water temperature includes: Item P is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. The parameters of item P are obtained by looking up the engine coolant temperature table. Item I is calculated based on the temperature difference between the actual engine coolant temperature and the target coolant temperature. The parameters in Item I are calibrated by looking up the engine coolant temperature table. Item D is calculated based on the actual engine coolant temperature change rate, and the parameters in Item D are calibrated by looking up the engine coolant temperature table. Calculate the increase or decrease of the sum of items P, I, and D to obtain the incremental demand of the main water pump; Based on the incremental demand of the main water pump, the actual speed increment of the main water pump is obtained.

6. The control method according to claim 1, characterized in that, When there is a heating request and the engine is not started, the main water pump speed is controlled according to the temperature difference between the air conditioning set temperature and the vehicle interior temperature.

7. The control method according to claim 1, characterized in that, After shutdown, if the engine coolant temperature is higher than the first set temperature, the engine speed will be maintained for a delay before shutting off immediately upon power-off. If the engine coolant temperature is lower than the first set temperature, maintain the set duty cycle and shut off after a second delay.

8. The control method according to claim 1, characterized in that: During operation, the speed increase and decrease rate of the main water pump is controlled based on NVH requirements and cooling needs.

9. A PID dynamic closed-loop control system for an electric main water pump of an engine, characterized in that, For configuring and implementing the control method as described in any one of claims 1-8, including: The judgment module is used to determine whether there is a heating request and whether the engine is started; The calculation module is used to calculate the main water pump speed based on water temperature economy, reliability, and heating demand when there is a heating request and the engine is started; and to calculate the main water pump speed based on water temperature economy and reliability when there is no heating request and the engine is started. The control module controls the main water pump to operate at the maximum pump speed based on the calculation results.

10. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors perform the steps of the method as described in any one of claims 1-8.

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