A control method and system of a hybrid engine electronic water pump

Abstract

The application discloses a kind of control method and system of hybrid engine electronic water pump, it is related to engine technical field, including based on engine real-time water temperature selection operating condition, collection engine real-time speed and torque;Establish engine load level evaluation model, set engine target water temperature and electronic water pump initial speed;Analysis engine target water temperature and real-time water temperature difference, based on ambient temperature and PID feedback, calculate target speed under different speed and torque.The method described in the application improves the flexibility of electronic water pump speed control by dynamically selecting the most suitable water temperature condition;Through the establishment of evaluation model to quantify engine load level, promote the optimization of water temperature control, improve the accuracy of electronic water pump speed control;Through accurate adjustment to the speed and torque of engine, reduce overshoot and oscillation and realize smooth temperature control, to improve the performance and fuel efficiency of engine.

Description

Technical Field

[0001] This invention relates to the field of engine technology, specifically to a control method and system for an electronic water pump in a hybrid engine. Background Technology

[0002] The cooling system is an important component of the engine. Its main function is to dissipate the heat generated by the engine through the coolant in a timely manner to prevent the engine from overheating. The water pump is a key component of the cooling system, which mainly provides power to the cooling system and keeps the coolant flowing.

[0003] Currently, to reduce fuel consumption in hybrid engines, electric water pumps have replaced traditional mechanical water pumps and are widely used in hybrid engines. However, in terms of electric water pump speed control, it is generally adjusted based on the engine's target coolant temperature. This target temperature is usually a fixed value, making it impossible to adjust in real-time according to operating conditions or achieve precise temperature control. This fails to meet the engine's actual needs, resulting in unnecessary energy loss. While traditional electric water pump speed control technology has a series of mature methods in hybrid and fuel-efficient engines, it still has several shortcomings. These shortcomings include limiting the efficiency of the engine cooling system, causing unnecessary energy waste, failing to adapt to dynamic changes in different operating conditions, and lacking sensitivity to changes in the external environment and load. Traditional electric water pump speed control methods mainly rely on a fixed target coolant temperature value, which is usually static and set as a constant value. This fixed-temperature control method ignores the actual changes in engine operating conditions. Traditional methods, without considering real-time engine parameters such as coolant temperature, speed, and torque, cannot adapt to dynamic demands under different loads and operating conditions. This rigid control method limits the flexibility of the engine cooling system and may lead to overheating or reduced cooling efficiency. Secondly, traditional methods do not provide sufficient precision and finesse to achieve accurate coolant temperature control because they rely solely on the target coolant temperature value without considering real-time temperature differences. Therefore, they cannot ensure that the coolant temperature is always kept within the required range, which may cause the coolant temperature to deviate from the ideal value, negatively impacting engine performance and fuel efficiency. Furthermore, traditional control methods typically do not adequately consider external environmental factors, such as changes in air temperature and humidity, as well as actual changes in engine load. This method lacks a feedback mechanism and cannot dynamically adjust the speed of the electronic water pump to adapt to different operating conditions. This may result in the water pump control strategy remaining unchanged under different external environmental conditions, without considering the impact of these factors on the cooling system, thereby reducing the efficiency and performance of the cooling system. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by this invention is that existing electronic water pump speed control methods suffer from low accuracy, low flexibility, low efficiency, and the inability to adjust in real time according to working conditions and to accurately control water temperature.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a control method for an electronic water pump of a hybrid engine, comprising selecting operating conditions based on the real-time engine water temperature, collecting the real-time engine speed and torque; establishing an engine load level assessment model, setting the engine target water temperature and the initial speed of the electronic water pump; analyzing the difference between the engine target water temperature and the real-time water temperature, and calculating the target speed under different speeds and torques based on the external temperature and PID feedback.

[0007] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the step of selecting the operating condition based on the real-time engine water temperature includes obtaining the real-time engine water temperature through a water temperature sensor, comparing the cold start threshold T1 and the high temperature threshold T2 to select the engine operating condition, which includes warm-up condition, driving condition and high temperature condition.

[0008] The cold start threshold T1 ranges from 60℃ to 70℃, and the high temperature threshold T2 ranges from 110℃ to 115℃.

[0009] When the engine coolant temperature is less than T1, select the warm-up mode, and the electronic water pump will run at the lowest speed with a fixed PWM duty cycle of 5%.

[0010] When the engine's real-time coolant temperature is greater than T2, the system selects to enter high-temperature operating condition, and the electronic water pump operates at its highest speed.

[0011] When the engine's real-time coolant temperature is greater than or equal to T1 and less than or equal to T2, select the driving condition and collect the engine's real-time speed and torque.

[0012] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the establishment of the engine load level assessment model includes establishing an engine load level assessment model L(t) based on overall engine load data, which is expressed as:

[0013]

[0014] Where t is the engine running time, t0 is the real-time engine running time, T represents the engine torque, R represents the engine speed, n represents the engine speed independent variable, F represents the fuel flow rate, A represents the intake air flow rate, α, β, and γ represent weighting coefficients, and λ represents the engine torque. T Let λ be the engine torque attenuation constant. A F represents the intake airflow attenuation constant, ω represents the frequency parameter, and F represents the intake airflow attenuation constant. maxThe maximum flow rate of fuel, where N represents the number of data points.

[0015] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the setting of the engine target water temperature includes classifying the real-time engine load level by using the engine load level evaluation model L(t) value, and setting the engine target water temperature based on the classification of the real-time engine load level.

[0016] When 0≤L(t)<3, the real-time load level of the engine is low, and the engine water temperature is increased by 15% of the L(t) function value.

[0017] When 3≤L(t)<7, the real-time load level of the engine is medium load, and the engine water temperature is increased by 10% of the L(t) function value.

[0018] When 7≤L(t)≤10, the real-time load level of the engine is high load. The engine water temperature is reduced by 15% of the L(t) function value. The change in oil viscosity is negatively correlated with the change in water temperature, and the engine friction is negatively correlated with the water temperature. A first preset data table is established to preset the engine water temperature.

[0019] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the initial speed of the electronic water pump includes establishing a second preset data table and querying the initial speed K of the electronic water pump under different speeds and torques. p The engine achieves thermal equilibrium through an initial speed controlled by an electronic water pump. Thermal equilibrium includes the engine power constraint P, expressed as:

[0020]

[0021] Where P0 is the engine's maximum power, a represents the engine aging time coefficient, b represents the engine's continuous operating time, h is the number of engine friction points, and c i Let represent the influence coefficient of the i-th friction point, where i is the friction point number.

[0022] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the analysis of the difference between the target water temperature and the real-time water temperature includes correcting the speed of the engine electronic water pump based on the difference between the target water temperature and the real-time water temperature of the engine, so that the real-time water temperature of the engine reaches the target water temperature.

[0023] After setting the target engine coolant temperature, the speed obtained from the second preset data table is used as the initial speed output to prepare for PID closed-loop control. The engine coolant temperature is the actual coolant temperature for real-time PID closed-loop control. The difference between the target coolant temperature and the current actual coolant temperature is calculated, and the speed of the electronic water pump is corrected based on the temperature difference to make the actual engine coolant temperature reach the target coolant temperature.

[0024] As a preferred embodiment of the control method for the hybrid engine electronic water pump described in this invention, the calculation of the target speed under different speeds and torques includes adding the base speed, temperature difference corrected speed, and ambient temperature correction amount under different speeds and torques based on external temperature and PID feedback to calculate the target speed, expressed as:

[0025]

[0026] Where K is the real-time rotational speed of the electronic water pump, E(t) is the difference between the actual water temperature and the target water temperature, and K i K is the integral coefficient for water temperature. u The correction amount for the electric water pump speed based on ambient temperature is queried through the third preset data table.

[0027] Another objective of this invention is to provide a control system for an electric water pump in a hybrid engine, which can select operating conditions based on the real-time engine water temperature and collect the real-time engine speed and torque, thus solving the problem of poor flexibility in the current electric water pump speed control.

[0028] As a preferred embodiment of the control system for the hybrid engine electronic water pump described in this invention, it includes: a working condition selection module, a load assessment module, and a speed calculation module; the working condition selection module is used to select the operating condition based on the real-time engine coolant temperature and to collect the real-time engine speed and torque; the load assessment module is used to establish an engine load level assessment model and set the engine target coolant temperature and the initial speed of the electronic water pump; the speed calculation module is used to analyze the difference between the engine target coolant temperature and the real-time coolant temperature, and to calculate the target speed under different speeds and torques based on the external temperature and PID feedback.

[0029] A computer device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement a method for controlling an electric water pump in a hybrid engine.

[0030] A computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of a control method for an electric water pump in a hybrid engine.

[0031] The beneficial effects of this invention are as follows: The control method for the hybrid engine electronic water pump provided by this invention dynamically selects the most suitable water temperature condition based on the current engine state and external environmental conditions, thereby improving the flexibility of electronic water pump speed control; by establishing an engine load level assessment model, the engine load level is quantified, promoting the optimization of water temperature control and improving the accuracy of electronic water pump speed control; by comparing the difference between the target water temperature and the real-time water temperature, combined with the external temperature and PID feedback algorithm, the engine speed and torque are precisely adjusted, reducing overshoot and oscillation and achieving stable temperature control, thereby improving engine performance and fuel efficiency. This invention achieves better results in terms of flexibility, accuracy, and efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The first embodiment of the present invention provides an overall flowchart of a control method for an electronic water pump of a hybrid engine.

[0034] Figure 2 This is a structural layout diagram of an engine cooling system for a control method of an electronic water pump for a hybrid engine, provided in the second embodiment of the present invention.

[0035] Figure 3 The following is an overall flowchart of a control system for an electric water pump in a hybrid engine, provided as a third embodiment of the present invention. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0037] Example 1

[0038] Reference Figure 1 As an embodiment of the present invention, a control method for an electronic water pump in a hybrid engine is provided, comprising:

[0039] S1: Select operating conditions based on real-time engine coolant temperature, and collect real-time engine speed and torque.

[0040] Furthermore, the operating condition selection based on the real-time engine coolant temperature includes obtaining the real-time engine coolant temperature through a coolant temperature sensor, comparing the cold start threshold T1 and the high temperature threshold T2 to select the engine's operating condition, which includes warm-up condition, driving condition, and high temperature condition.

[0041] The cold start threshold T1 ranges from 60℃ to 70℃, and the high temperature threshold T2 ranges from 110℃ to 115℃.

[0042] When the engine coolant temperature is less than T1, select the warm-up mode, and the electronic water pump will run at the lowest speed with a fixed PWM duty cycle of 5%.

[0043] When the engine's real-time coolant temperature is greater than T2, the system selects to enter high-temperature operating condition, and the electronic water pump operates at its highest speed.

[0044] When the engine's real-time coolant temperature is greater than or equal to T1 and less than or equal to T2, select the driving condition and collect the engine's real-time speed and torque.

[0045] It should be noted that during warm-up, the electronic water pump operates at the lowest speed with a fixed PWM duty cycle of 5%. The purpose is to lock the engine heat inside as much as possible, allowing the cylinder wall temperature, oil temperature, and water temperature to rise rapidly, reducing engine friction, and preventing the oil temperature from being too low for a long time in winter, which could lead to dilution.

[0046] It should also be noted that the cylinder wall temperature of the engine needs to be measured to confirm that there is no risk of overheating inside the engine. Under high temperature conditions, the electric water pump should be operated at its highest speed to increase the engine cooling flow, reduce the rate of water temperature rise, and prevent the engine from overheating.

[0047] S2: Establish an engine load level assessment model and set the target engine coolant temperature and the initial speed of the electric water pump.

[0048] Furthermore, establishing an engine load level assessment model includes establishing an engine load level assessment model L(t) based on overall engine load data, which is expressed as:

[0049]

[0050] Where t is the engine running time, t0 is the real-time engine running time, T represents the engine torque, R represents the engine speed, n represents the engine speed independent variable, F represents the fuel flow rate, A represents the intake air flow rate, α, β, and γ represent weighting coefficients, and λ represents the engine torque. T Let λ be the engine torque attenuation constant. A F represents the intake airflow attenuation constant, ω represents the frequency parameter, and F represents the intake airflow attenuation constant. max The maximum flow rate of fuel, where N represents the number of data points.

[0051] It should be noted that setting the engine target coolant temperature involves classifying the engine's real-time load level using the engine load level assessment model L(t) value, and then setting the engine target coolant temperature based on the classification of the engine's real-time load level.

[0052] When 0≤L(t)<3, the real-time load level of the engine is low, and the engine water temperature is increased by 15% of the L(t) function value.

[0053] When 3≤L(t)<7, the real-time load level of the engine is medium load, and the engine water temperature is increased by 10% of the L(t) function value.

[0054] When 7≤L(t)≤10, the real-time load level of the engine is high load. The engine water temperature is reduced by 15% of the L(t) function value. The change in oil viscosity is negatively correlated with the change in water temperature, and the engine friction is negatively correlated with the water temperature. A first preset data table is established to preset the engine water temperature.

[0055] It should also be noted that, referring to the first preset data table in Table 1, the preset water temperature can be found in the first preset data table as the engine target water temperature. The target water temperature is set according to the engine load. Under low and medium loads, the engine water temperature is appropriately increased, thereby reducing the viscosity of the engine oil, which reduces the friction between the moving parts of the engine and puts the engine in a better operating condition, achieving the effect of saving fuel and reducing emissions. Under high loads, the engine water temperature needs to be appropriately reduced to improve engine combustion knocking, improve engine combustion efficiency, and reduce fuel consumption.

[0056] Table 1 First Preset Data Table

[0057]

[0058] It should also be noted that the initial speed of the electric water pump includes establishing a second preset data table and querying the initial speed K of the electric water pump under different speeds and torques. p The engine achieves thermal equilibrium through an initial speed controlled by an electronic water pump. Thermal equilibrium includes the engine power constraint P, expressed as:

[0059]

[0060] Where P0 is the engine's maximum power, a represents the engine aging time coefficient, b represents the engine's continuous operating time, h is the number of engine friction points, and c i Let represent the influence coefficient of the i-th friction point, where i is the friction point number.

[0061] It should also be noted that, referring to the second preset data table in Table 2, the initial speed K of the electric water pump under different speeds and torques can be found in the second preset data table. p This speed is calibrated under steady-state engine conditions and is the minimum speed at which the electric water pump can reach thermal equilibrium, thus reducing the power consumption of the electric water pump and meeting thermal management requirements.

[0062] Table 2 Second Preset Data Table

[0063]

[0064] S3: Analyze the engine target coolant temperature and real-time coolant temperature difference, and calculate the target speed under different speeds and torques based on the external temperature and PID feedback.

[0065] Furthermore, the analysis of the difference between the engine's target coolant temperature and the real-time coolant temperature includes adjusting the engine's electronic water pump speed based on the difference between the target coolant temperature and the engine's real-time coolant temperature, so that the engine's real-time coolant temperature reaches the target coolant temperature.

[0066] After setting the target engine coolant temperature, the speed obtained from the second preset data table is used as the initial speed output to prepare for PID closed-loop control. The engine coolant temperature is the actual coolant temperature for real-time PID closed-loop control. The difference between the target coolant temperature and the current actual coolant temperature is calculated, and the speed of the electronic water pump is corrected based on the temperature difference to make the actual engine coolant temperature reach the target coolant temperature.

[0067] It should be noted that calculating the target speed at different speeds and torques includes adding the base speeds at different speeds and torques based on external temperature and PID feedback, the temperature-corrected speed, and the ambient temperature correction, to calculate the target speed, expressed as:

[0068]

[0069] Where K is the real-time rotational speed of the electronic water pump, E(t) is the difference between the actual water temperature and the target water temperature, and K i K is the integral coefficient for water temperature. u The correction amount for the electric water pump speed based on ambient temperature is queried through the third preset data table.

[0070] It should also be noted that during vehicle operation, the engine's heat needs to be carried away from the radiator by the oncoming airflow to bring the engine to a balanced temperature. The ambient temperature directly determines the temperature of the oncoming airflow, so it is necessary to correct for the ambient temperature to prevent the engine's actual coolant temperature from exceeding the target coolant temperature and causing overheating.

[0071] It should also be noted that Table 3 is the third preset data table, through which the correction amount of ambient temperature for the electric water pump speed can be queried.

[0072] Table 3 Third Preset Data Table

[0073]

[0074]

[0075] Example 2

[0076] Reference Figure 2 As an embodiment of the present invention, a control method for an electronic water pump of a hybrid engine is provided. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0077] first, Figure 2 This refers to the vehicle cooling system. The engine cooling device includes an electric water pump, cylinder block, cylinder head, temperature control module (or thermostat), radiator branch (large circulation), and small circulation branch. The arrows in the diagram indicate the direction of coolant flow. The electric water pump is driven by an electric motor, completely decoupled from the engine speed. The motor current can be infinitely adjusted. A water temperature sensor on the engine is used to obtain the real-time engine water temperature, and the speed of the electric water pump is controlled based on this temperature. In this structure, the engine block and cylinder head are connected in series, and a water temperature sensor is installed at the cylinder head outlet to obtain the real-time engine temperature. After the vehicle is powered on, the real-time engine water temperature is determined by the water temperature sensor, and the engine's operating conditions are determined based on this temperature. When the operating condition is driving, the real-time engine speed and load are acquired, and the preset coolant temperature is retrieved from the first preset data as the target coolant temperature for the engine. At the same time, the initial speed of the electronic water pump under different speeds and torques is retrieved from the second preset data. Based on the difference between the real-time coolant temperature and the target coolant temperature, a PID feedback method is used to correct the electronic water pump speed for temperature difference. Then, the ambient temperature is acquired, and the correction amount of the ambient temperature for the electronic water pump speed is retrieved from the third preset data. Finally, the initial speed, the temperature difference corrected speed, and the ambient temperature correction amount are added together to obtain the target speed. Based on the target temperatures of the three operating conditions, the speed of the electronic water pump is precisely set. Under the premise of ensuring that the engine coolant temperature does not overheat, the cooling flow can be adjusted on demand to meet the real-time needs of the engine.

[0078] Refer to Table 4 for experimental data conducted under different environments, and record the data during the experimental process.

[0079] Table 4 Experimental Data Recording Table

[0080]

[0081] After the engine starts, real-time coolant temperature data is collected first via a coolant temperature sensor, while speed and torque data are also recorded. Based on this data, the engine load level assessment model L(t) is calculated in real time. The engine operating condition is determined by comparing the real-time coolant temperature with thresholds T1 and T2, and the target coolant temperature is adjusted accordingly. Using PID closed-loop control logic, combined with external temperature data, the speed of the electric water pump is dynamically adjusted to bring the actual coolant temperature close to the target temperature. The data table shows that in Test 1, the real-time coolant temperature is lower than T1, so a warm-up condition is selected, and the electric water pump operates at a lower speed to help the engine reach the ideal operating temperature as quickly as possible. Tests 2 and 4 are driving conditions, with the real-time coolant temperature between T1 and T2. In these cases, the speed of the electric water pump is adjusted according to the load level to ensure the engine maintains its optimal operating temperature. In Test 3, the real-time coolant temperature exceeds T2, and the engine enters a high-temperature condition. The electric water pump operates at a higher speed to quickly reduce the coolant temperature and prevent engine overheating.

[0082] These data fully demonstrate the effectiveness of our invention in practical applications. By precisely controlling the speed of the electronic water pump, the invention can not only effectively maintain the ideal operating temperature of the engine under different working conditions, but also flexibly adjust according to different load levels. These features demonstrate the creativity and novelty of the invention. Compared with existing technologies, it can more effectively improve engine performance and fuel efficiency. Therefore, our invention is creative.

[0083] Example 3

[0084] Reference Figure 3 As an embodiment of the present invention, a control system for an electronic water pump of a hybrid engine is provided, including an operating condition selection module, a load assessment module, and a speed calculation module.

[0085] The operating condition selection module is used to select the operating condition based on the real-time engine coolant temperature and to collect the real-time engine speed and torque; the load assessment module is used to establish an engine load level assessment model and set the engine target coolant temperature and the initial speed of the electronic water pump; the speed calculation module is used to analyze the difference between the engine target coolant temperature and the real-time coolant temperature, and to calculate the target speed under different speeds and torques based on the external temperature and PID feedback.

[0086] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0087] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0088] More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0089] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc. It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control method for an electronic water pump in a hybrid engine, characterized in that, include: Select operating conditions based on real-time engine coolant temperature, and collect real-time engine speed and torque; Establish an engine load level assessment model and set the target engine coolant temperature and the initial speed of the electric water pump; Analyze the engine target coolant temperature and real-time coolant temperature difference, and calculate the target speed under different speeds and torques based on the external temperature and PID feedback; The establishment of the engine load level assessment model includes establishing an engine load level assessment model L(t) based on the overall engine load data, which is expressed as: Where t is the engine running time, t0 is the real-time engine running time, T represents the engine torque, R represents the engine speed, n represents the engine speed independent variable, F represents the fuel flow rate, A represents the intake air flow rate, and α, β, and Represented as weighting coefficients, This is expressed as the engine torque attenuation constant. This represents the intake flow rate attenuation constant. Represented as a frequency parameter, F max The maximum flow rate of fuel, where N represents the number of data points; The setting of the target engine coolant temperature includes classifying the real-time engine load level using the engine load level assessment model L(t) value, and setting the target engine coolant temperature based on the classification of the real-time engine load level. when At that time, the engine real-time load level is low, and the engine coolant temperature is increased by 15% of the L(t) function value; when At that time, the engine's real-time load level was medium load, and the engine coolant temperature was increased by 10% of the L(t) function value; when At that time, the engine real-time load level is high load, the engine water temperature is reduced by 15% of the L(t) function value, the change in oil viscosity is negatively correlated with the change in water temperature, the engine friction is negatively correlated with water temperature, a first preset data table is established, and the engine water temperature is preset.

2. The control method for the electric water pump of a hybrid engine as described in claim 1, characterized in that: The method of selecting operating conditions based on real-time engine coolant temperature includes obtaining the real-time engine coolant temperature through a coolant temperature sensor, comparing the cold start threshold T1 and the high temperature threshold T2 to select the engine operating conditions, which include warm-up condition, driving condition and high temperature condition. The cold start threshold T1 ranges from 60℃ to 70℃, and the high temperature threshold T2 ranges from 110℃ to 115℃. When the engine coolant temperature is less than T1, select the warm-up mode. The electronic water pump will run at the lowest speed with a fixed PWM duty cycle of 5%. When the engine coolant temperature is greater than T2, select to enter high temperature operating condition, and the electronic water pump will run at the highest speed. When the engine's real-time coolant temperature is greater than or equal to T1 and less than or equal to T2, select the driving condition and collect the engine's real-time speed and torque.

3. The control method for the electric water pump of a hybrid engine as described in claim 2, characterized in that: The initial speed of the electronic water pump includes establishing a second preset data table and querying the initial speed K of the electronic water pump under different speeds and torques. p The engine achieves thermal equilibrium through an initial speed controlled by an electronic water pump. Thermal equilibrium includes the engine power constraint P, expressed as: Where P0 is the engine's maximum power, a represents the engine aging time coefficient, b represents the engine's continuous operating time, h is the number of engine friction points, and c i Let represent the influence coefficient of the i-th friction point, where i is the friction point number.

4. The control method for the electric water pump of a hybrid engine as described in claim 3, characterized in that: The analysis of the difference between the target water temperature and the real-time water temperature of the engine includes correcting the speed of the engine's electronic water pump based on the difference between the target water temperature and the engine's real-time water temperature, so that the engine's real-time water temperature reaches the target water temperature. After setting the target engine coolant temperature, the speed obtained from the second preset data table is used as the initial speed output to prepare for PID closed-loop control. The engine coolant temperature is the actual coolant temperature for real-time PID closed-loop control. The difference between the target coolant temperature and the current actual coolant temperature is calculated, and the speed of the electronic water pump is corrected based on the temperature difference to make the actual engine coolant temperature reach the target coolant temperature.

5. The control method for the electric water pump of a hybrid engine as described in claim 4, characterized in that: The calculation of the target speed under different speeds and torques includes adding the base speed, temperature difference corrected speed, and ambient temperature correction amount under different speeds and torques based on the external temperature and PID feedback to calculate the target speed, expressed as: Where K is the real-time rotational speed of the electronic water pump, E(t) is the difference between the actual water temperature and the target water temperature, and K i K is the integral coefficient for water temperature. u The correction amount for the electric water pump speed based on ambient temperature is queried through the third preset data table.

6. A system employing the control method for a hybrid engine electronic water pump as described in any one of claims 1 to 5, characterized in that: Includes a working condition selection module, a load assessment module, and a speed calculation module; The operating condition selection module is used to select the operating condition based on the real-time engine coolant temperature and to collect the real-time engine speed and torque. The load assessment module is used to establish an engine load level assessment model and set the target engine coolant temperature and the initial speed of the electronic water pump. The speed calculation module is used to analyze the engine target water temperature and real-time water temperature difference, and calculate the target speed under different speeds and torques based on the external temperature and PID feedback.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the control method for the hybrid engine electronic water pump as described in any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the electric water pump of the hybrid engine as described in any one of claims 1 to 5.

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