Control method and apparatus for electronic main water pump of engine, and storage medium

Abstract

The present application relates to the technical field of engine control, and particularly provides a control method and apparatus for an electronic main water pump of an engine, and a storage medium. The method comprises: S1, obtaining a first parameter set and knocking compensation parameters, on the basis of the first parameter set and the knocking compensation parameters, determining whether an electronic main water pump can start closed-loop control based on a target water temperature, and if yes, performing S2; S2, on the basis of the current engine state, determining whether a condition for enabling a knocking compensation function is met; if the determination result is yes, performing S3, and if the determination result is no, performing S5; S3, on the basis of the current output offset of the electronic main water pump, determining whether to carry out knocking compensation, if the output offset of the electronic main water pump is greater than a preset value, carrying out knocking compensation, and performing S4; otherwise, performing S5; S4, switching the closed-loop control based on the target water temperature to open-loop control based on the target water temperature; and S5, starting an open-loop control strategy based on the target water temperature. In this way, the objective of improving the cooling intensity and the thermal efficiency of the engine is achieved.

Description

Engine electronic main water pump control method, device and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2023, with application number 202310773536.6 and invention name “A method, device and storage medium for controlling an engine electronic main water pump”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of engine control technology, and in particular to an engine electronic main water pump control method, device and storage medium. Background Art

[0003] The function of an engine's electronic main water pump is to control its flow rate or speed through closed-loop correction of the engine's target water temperature, precisely controlling the actual water temperature to track the target. To improve engine thermal efficiency, the Atkinson cycle, high compression ratio, and electronic main water pump technology are widely adopted. Compared to traditional mechanical water pumps, electronic main water pumps can provide appropriate cooling flow and intensity based on engine operating conditions, minimizing unnecessary energy loss. For engines using the high-compression Atkinson cycle, current electronic main water pump design and control strategies primarily ensure that full power and full flow are only required to meet cooling requirements under high-temperature, high-speed, and high-load operating conditions. In non-knock regions, the pump operates at the lowest possible power and flow rate to minimize unnecessary energy consumption. In the knock-prone regions of low speed, medium load, and high speed, medium load, the electronic main water pump is not operated at full power in these regions, primarily to minimize knock potential and power consumption.

[0004] CN110805487B provides a control method for an engine electronic main water pump. The method comprises: obtaining a target engine water outlet temperature and a base pump speed of the electronic main water pump; obtaining a PID control correction coefficient based on the target engine water outlet temperature and the measured engine water outlet temperature; obtaining an ambient temperature correction coefficient, and obtaining a target speed of the electronic main water pump based on the base pump speed, the PID control correction coefficient, and the ambient temperature correction coefficient; and controlling the engine electronic main water pump using the target speed of the electronic main water pump. The patent also provides a control system for an engine electronic main water pump. This patent implements a two-step control of the target speed of the electronic main water pump. The first step is to output the target speed of the electronic fan and the base pump speed to achieve pre-control and improve system responsiveness. The second step is to use the PID and ambient temperature to jointly correct the base pump speed to improve control accuracy.

[0005] CN106979061A discloses a method for controlling an electronic main water pump of an engine, comprising the following steps: after a vehicle is powered on, determining the current mode of the electronic main water pump by detecting a water temperature sensor and an engine speed; collecting data on the current vehicle speed, the current flow rate of the electronic main water pump, the engine load, and the engine speed in real time, and obtaining a heat evaluation parameter; obtaining a correction value for adjusting the electronic main water pump in a normal working mode or a fault mode; and obtaining an optimized adjustment time based on a changing trend of the heat evaluation parameter; and optimizing and adjusting the electronic main water pump based on the correction value and the optimized adjustment time.

[0006] In the aforementioned patents, the purpose of electronic main water pump control is to precisely control the actual engine water temperature to accurately follow the target water temperature under different operating conditions. This target water temperature is measured on the engine bench using a calibrated median engine. When this target water temperature is achieved and the engine is on the knock boundary, the engine fuel consumption is minimized (non-external characteristic operating conditions) or the power is maximized (external characteristic operating conditions). Therefore, the aforementioned invention patents do not take into account that in mass production applications of engines, based on the target water temperature determined by bench calibration, after a knock occurs in the knock-prone operating condition, the remaining cooling capacity of the electronic main water pump can be used to increase the engine coolant flow rate.

[0007] The bench calibration process for the target water temperature master control map of the electronic main water pump clearly accounts for the effects of knock and water temperature on the main water pump's operating power. However, for high-compression-ratio Atkinson-cycle engines, parameters influencing engine knock, such as deviations in the static compression ratio, intake and exhaust phases, variations in the flow resistance coefficient of the cylinder block and cylinder head water jacket, and deviations in the flow characteristics of the electronic main water pump, can cause knock in production engines that are not within the design tolerances. The existing engine management system (EMS) logic addresses engine knock after production only through knock diagnosis. Upon detection of knock, the ignition angle in the cylinder experiencing knock is retarded to reduce the knock tendency. For strong knock, a self-learning method is used to advance the ignition angle to prevent knock. Regardless of the method used, retarding the ignition angle reduces thermal efficiency and engine power.

[0008] Summary of the Invention

[0009] The purpose of this application is to provide an engine electronic main water pump control method, device and storage medium to solve the problem in the prior art that high compression ratio, Atkinson cycle engines are prone to knock, resulting in reduced power performance and reduced engine thermal efficiency;

[0010] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0011] In a first aspect, an embodiment of the present application provides a method for controlling an electronic main water pump of an engine, comprising:

[0012] S1: Acquire a first parameter group and a knock compensation parameter of an engine in a vehicle, and determine whether an electronic main water pump in the vehicle can start closed-loop control based on a target water temperature based on the first parameter group and the knock compensation parameter. If the determination is yes, proceed to S2;

[0013] S2: Determine whether a condition for enabling the knock compensation function is met based on the first parameter group and the knock compensation parameter; if yes, proceed to S3; if no, proceed to S5;

[0014] S3: Determine whether to perform knock compensation based on the knock compensation control offset in the knock compensation parameter. If the knock compensation control offset is greater than a preset value, perform knock compensation and proceed to S4; otherwise, proceed to S5;

[0015] S4: switching the closed-loop control strategy based on the target water temperature to an open-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump according to a first control parameter determined by the open-loop control strategy to perform thermal management on the engine;

[0016] S5: starting a closed-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump by using a second control parameter determined by the closed-loop control strategy to perform thermal management on the engine.

[0017] In combination with the first aspect, in some optional embodiments, the first parameter group includes the current vehicle speed, engine speed, engine load, engine water temperature, knock identification flag and cylinder deignition angle caused by knock, and the knock compensation parameters include the knock compensation control module start flag and the knock compensation control offset.

[0018] In combination with the first aspect, in some optional implementations, in step S4, the first control parameter is the sum of the latest output value obtained from the previous calculation cycle and closed-loop control stored in advance and the knock compensation control offset.

[0019] In combination with the first aspect, in some optional implementations, in step S5, the second control parameter is the sum of the pre-controlled MAP value of the electronic main water pump and the target water temperature closed-loop adjustment PID.

[0020] In conjunction with the first aspect, in some optional implementations, the control of knock compensation includes the following steps:

[0021] A1: Based on the second parameter group and the engine operating condition setting range, determine the knock compensation effect area and determine whether to enable the knock compensation function. If so, enable the knock compensation function and proceed to A2. If not, the electronic main water pump speed compensation value caused by knock is equal to 0, the knock compensation function is not enabled, and proceed to A4.

[0022] A2: If knock is detected in at least one cylinder and the cylinder de-ignition angle caused by the knock exceeds the threshold, proceed to A3; if no knock is detected, the electronic main water pump compensation value caused by the knock is equal to the current value of the electronic main water pump self-learning register corresponding to the current operating range, and proceed to A4;

[0023] A3: Update the self-learning value of the electronic main water pump self-learning register corresponding to the current working condition area. The updated register learning value is equal to the sum of the old register value and the self-learning offset, and then enter A4;

[0024] A4: Compare the knock compensation values ​​obtained in A1, A2, and A3 with the speed margin or flow margin under the current operating conditions, and select the minimum value as the final value output of the knock compensation function.

[0025] In combination with the first aspect, in some optional embodiments, the second parameter group includes engine water temperature, engine speed and engine load, and the engine operating condition setting range is: the engine water temperature is greater than the first temperature and less than the second temperature, and the water pump working efficiency in the main pulse spectrum of the electronic main water pump corresponding to the engine speed and engine load is less than the preset maximum power.

[0026] In combination with the first aspect, in some optional implementations, the self-learning offset is a preset water pump speed or a preset water pump flow.

[0027] In combination with the first aspect, in some optional implementations, the threshold is set to a first crankshaft angle to a second crankshaft angle.

[0028] In a second aspect, an embodiment of the present application provides an engine electronic main water pump control device, comprising:

[0029] A closed-loop control determination module is configured to obtain a first parameter group and a knock compensation parameter of an engine in a vehicle, and determine, based on the first parameter group and the knock compensation parameter, whether an electronic main water pump in the vehicle can start closed-loop control based on a target water temperature;

[0030] a compensation condition determination module: if the closed-loop control determination module determines that the result is yes, determining whether a condition for enabling the knock compensation function is met based on the first parameter group and the knock compensation parameter;

[0031] Knock compensation determination module: If the compensation condition determination module determines as yes, it determines whether to perform knock compensation based on the knock compensation control offset in the knock compensation parameter; if the compensation condition determination module determines as no, it starts the closed-loop control strategy based on the target water temperature; if the knock compensation control offset is greater than the preset value, knock compensation is performed, and the closed-loop control based on the target water temperature is switched to the open-loop control based on the target water temperature; if the knock compensation control offset is less than or equal to the preset value, the closed-loop control strategy based on the target water temperature is started.

[0032] In a third aspect, an embodiment of the present application provides a computer storage medium, in which a computer program is stored. When the computer program is run on a computer, the engine electronic main water pump control method as described above can be executed.

[0033] Beneficial effects of this application:

[0034] This application builds upon existing closed-loop control based on target water temperature by adding an auxiliary function that utilizes the electronic main water pump's excess cooling capacity under existing operating conditions to suppress knock after it has already occurred. To achieve the goal of suppressing knock by utilizing this excess cooling capacity to lower the water temperature, this application utilizes an open-loop strategy for engine water temperature control during periods of strong knock, during which the knock suppression auxiliary function is activated. When no knock is occurring, the engine water temperature control maintains a closed-loop strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a control logic diagram of a control method for an electronic main water pump of an engine according to the present invention;

[0036] FIG2 is a knock compensation logic diagram of the control method of the electronic main water pump of the engine of the present application;

[0037] FIG3 is a schematic diagram of components of the control device of the electronic main water pump of the engine of the present application.

[0038] Among them, 10, closed-loop control determination module; 20, compensation condition determination module; 30, knock compensation determination module. DETAILED DESCRIPTION

[0039] The following will describe the embodiments of the present application with reference to the accompanying drawings and optional embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the optional embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0041] As shown in Figures 1-2, an embodiment of the present application provides a method for controlling an electronic main water pump of an engine, comprising the following steps:

[0042] S1: Acquire a first parameter group and a knock compensation parameter of an engine in a vehicle, and determine whether an electronic main water pump in the vehicle can start closed-loop control based on a target water temperature based on the first parameter group and the knock compensation parameter. If the determination is yes, proceed to S2;

[0043] S2: Determine whether a condition for enabling the knock compensation function is met based on the first parameter group and the knock compensation parameter; if yes, proceed to S3; if no, proceed to S5;

[0044] S3: Determine whether to perform knock compensation based on the knock compensation control offset in the knock compensation parameter. If the knock compensation control offset is greater than a preset value, perform knock compensation and proceed to S4; otherwise, proceed to S5;

[0045] S4: switching the closed-loop control strategy based on the target water temperature to an open-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump according to a first control parameter determined by the open-loop control strategy to perform thermal management on the engine;

[0046] S5: starting a closed-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump by using a second control parameter determined by the closed-loop control strategy to perform thermal management on the engine.

[0047] In step S1, a first parameter set and knock compensation parameters for the vehicle's engine are acquired. Based on the first parameter set and the knock compensation parameters, a determination is made as to whether the vehicle's electronic main water pump can initiate closed-loop control based on the target water temperature. If the determination is yes, the process proceeds to step S2. The first parameter set includes parameters such as the current vehicle speed, engine speed, engine load, engine water temperature, knock identification flag, and cylinder de-ignition angle caused by knock. Knock compensation parameters include parameters such as the knock compensation control module activation flag and knock compensation control offset. Specifically, the engine-related information acquisition and determination module acquires parameters such as the current vehicle speed, engine speed, engine load, engine water temperature, knock identification flag, and cylinder de-ignition angles caused by knock, as well as parameters output by the knock compensation control module (including parameters such as the knock compensation control module activation flag and knock compensation control offset). Based on this information, a determination is made as to whether the main water pump control can enter the closed-loop control function module based on the target water temperature. If the determination is yes, the process proceeds to step S2. Under certain vehicle conditions, such as during the engine warm-up process after a cold start, the engine water temperature is low and the electronic main water pump typically runs at the lowest safe speed to quickly warm the engine. During these conditions, the engine cooling system does not need and cannot enter closed-loop control based on the target water temperature. Closed-loop control based on the target water temperature is only possible after the engine warm-up is complete.

[0048] In step S2, a determination is made based on the first parameter set and the knock compensation parameters to determine whether the conditions for enabling the knock compensation function are met. If so, the process proceeds to S3; if not, the process proceeds to S5. The information acquisition and determination module, based on the aforementioned information, then determines whether the current state meets the conditions for enabling the electronic main water pump knock compensation function module. The determination process can be referenced in the electronic main water pump compensation control method, apparatus, system, vehicle, medium, and equipment disclosed in Application No. 202310120320.X, and will not be further described here. If so, the process proceeds to S3; if not, the process proceeds to S5.

[0049] In step S3, a determination is made as to whether knock compensation should be performed based on the knock compensation control offset in the knock compensation parameters. If the knock compensation control offset is greater than a preset value, knock compensation is performed and the process proceeds to S4; otherwise, the process proceeds to S5. In this application, the preset value is 0. The knock compensation control module determines whether knock compensation should be performed based on the current knock compensation control offset in the knock compensation control module. If the offset is greater than 0, indicating that knock compensation is necessary, the process proceeds to S4; if not, the process proceeds to S5.

[0050] In step S4, the closed-loop control strategy based on the target water temperature is switched to an open-loop control strategy based on the target water temperature. The electronic main water pump is controlled using a first control parameter determined by the open-loop control strategy to provide thermal management for the engine. The first control parameter is the sum of the latest output value from the previous stored calculation cycle and closed-loop control, plus the vibration compensation control offset. The first control parameter is the final output value required for electronic main water pump control.

[0051] In step S5, an open-loop control strategy based on the target water temperature is activated to increase engine cooling intensity and thermal efficiency. A closed-loop control strategy based on the target water temperature is also activated for the main water pump. The closed-loop strategy calculates an output value equal to the electronic main water pump pre-control MAP value + the target water temperature closed-loop control PID. The second control parameter type is the same as the first control parameter, both representing the final output value required for electronic main water pump control.

[0052] This application is based on the conventional control strategy of the existing electronic main water pump, and utilizes the electronic main water pump engine. In the small and medium load knock-sensitive area, the cooling capacity of the water pump has a certain surplus. When knock occurs, the target water temperature under the current working conditions is open-loop controlled, and the capacity margin of the main water pump is utilized to increase the cooling intensity under the knock condition, reduce the knock trend, and improve the thermal efficiency of the engine.

[0053] It is worth noting that, as shown in Figure 2, in step S3, the specific strategy of the knock compensation control module is as follows: First, each time the engine is powered off, the value of the electronic main water pump self-learning register mentioned in this application is initially assigned to 0. This ensures that the register is initialized to 0 each time the engine is powered on. Then, after the engine is started, the following steps are executed:

[0054] A1: Based on the second parameter group and the engine operating condition setting range, determine the knock compensation effect area and determine whether to enable the knock compensation function. If so, enable the knock compensation function and proceed to A2. If not, the electronic main water pump speed compensation value caused by knock is equal to 0, the knock compensation function is not enabled, and proceed to A4.

[0055] A2: If knock is detected in at least one cylinder and the cylinder de-ignition angle caused by the knock exceeds the threshold, proceed to A3; if no knock is detected, the electronic main water pump compensation value caused by the knock is equal to the current value of the electronic main water pump self-learning register corresponding to the current operating range, and proceed to A4;

[0056] A3: Update the self-learning value of the electronic main water pump self-learning register corresponding to the current working condition area. The updated register learning value is equal to the sum of the old register value and the self-learning offset, and then enter A4;

[0057] A4: Compare the knock compensation values ​​obtained in A1, A2, and A3 with the speed margin or flow margin under the current working conditions, and select the minimum value as the final value output of the knock compensation function

[0058] In step A1, based on the second parameter set and the engine operating condition setting range, the knock compensation range is determined and whether to enable the knock compensation function is determined. If so, the knock compensation function is enabled and the process proceeds to step A2. If not, the knock-induced electronic main water pump speed compensation value is set to 0, the knock compensation function is disabled, and the process proceeds to step A4. If the engine water temperature under the current operating condition is less than a threshold value T, or the engine speed under the current operating condition does not fall within the set range, or the engine load under the current operating condition does not fall within the set range, the knock-induced electronic main water pump speed compensation value is set to 0, and the process proceeds to step A4. If the current engine water temperature is greater than T, and the engine speed and load under the current operating condition fall within the set range, the knock-induced electronic main water pump compensation function is enabled, and the process proceeds to step A2. The operating range determined by the engine speed and load is generally determined by the standard that the water pump operating power in the main pulse spectrum of the electronic main water pump is less than 0.9 times the maximum power. The engine water temperature threshold T is generally greater than a first temperature and less than a second temperature, wherein the first temperature is 60°C and the second temperature is 80°C.

[0059] In step A2, if knock is detected in at least one cylinder and the deignition angle caused by knock exceeds a threshold, the process proceeds to A3. If no knock is detected, the knock-induced electronic main water pump compensation value is equal to the current value of the electronic main water pump self-learning register corresponding to the current operating range, and the process proceeds to A4. If the knock diagnosis flag for one or more cylinders is set and the average deignition angle caused by knock in each cylinder exceeds threshold A, the knock-induced electronic main water pump compensation function flag is set, and the process proceeds to A3. If the knock-induced electronic main water pump compensation function flag is not set, the knock-induced electronic main water pump compensation value is equal to the old value of the knock-induced electronic main water pump compensation self-learning register. If no knock is detected in the current operating conditions, the knock-induced electronic main water pump compensation value is equal to the current value of the electronic main water pump self-learning register corresponding to the current operating range, and the process proceeds to A4. The deignition angle threshold A is generally set between -3 and -6 crankshaft angle degrees.

[0060] In step A3, the self-learning value update is performed on the electronic main water pump self-learning register corresponding to the current operating condition area, where the updated register learning value is equal to the sum of the old register value and the self-learning offset, and then enters A4. Specifically, under the current operating condition, if it is detected that at least one cylinder has knocked and the deignition angle caused by the knock exceeds the threshold A, the electronic main water pump self-learning register corresponding to the current operating condition area will perform a self-learning value update - the register update value is equal to the old register value plus the self-learning offset, and then enters execution A4. The main water pump compensation self-learning register is divided into areas at fixed intervals according to the speed and load range determined by A1, and is named in a certain order according to certain rules. Each register corresponds to a divided operating condition area. The register self-learning offset is the preset water pump speed or the preset water pump flow. The register self-learning offset is generally set to 0.1 times the maximum speed of the electronic main water pump or 0.1 times the maximum flow.

[0061] In step A4, the knock compensation values ​​obtained in steps A1, A2, and A3 are compared with the speed margin or flow margin under the current operating condition. The minimum value is selected as the final output value for the knock compensation function. The knock-induced electronic main water pump compensation value obtained after the first three steps is compared with the electronic main water pump's margin under the current operating condition. The smaller value is taken as the knock-induced electronic main water pump compensation value for this function under the current operating condition and output to the electronic main water pump main control module. The margin under the current operating condition is equal to the difference between the electronic main water pump's maximum speed or flow and the electronic main water pump's required speed or flow output by the electronic main water pump main control module.

[0062] In conjunction with FIG3 , the present application further provides an engine electronic main water pump control device, comprising at least one software function module stored in a storage module in the form of software or firmware, or embedded in an operating system (OS) within a control device. A closed-loop control determination module 10 is configured to execute executable modules stored in the storage module, such as the software function modules and computer program modules included in the engine electronic main water pump control device.

[0063] The device further includes a closed-loop control determination module 10, a closed-loop control determination module 20, and a knock compensation determination module 30. The functions of each module are as follows:

[0064] The closed-loop control determination module 10 obtains a first parameter group and a knock compensation parameter of an engine in a vehicle, and determines whether an electronic main water pump in the vehicle can start closed-loop control based on a target water temperature based on the first parameter group and the knock compensation parameter;

[0065] The compensation condition determination module 20 determines whether a condition for enabling the knock compensation function is met based on the first parameter group and the knock compensation parameter if the closed-loop control determination module 10 determines yes.

[0066] Knock compensation determination module 30: If the closed-loop control determination module 20 determines as yes, it determines whether to perform knock compensation based on the knock compensation control offset in the knock compensation parameter; if the closed-loop control determination module 20 determines as no, it starts the closed-loop control strategy based on the target water temperature; if the output offset of the electronic main water pump is greater than the preset value, knock compensation is performed, and the closed-loop control based on the target water temperature is switched to the open-loop control based on the target water temperature; if the knock compensation control offset is less than or equal to the preset value, the closed-loop control strategy based on the target water temperature is started.

[0067] In this embodiment, the storage module may be, but is not limited to, a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc. In this embodiment, the storage module may be used to store multiple preset thresholds in the closed-loop control determination module 10 and the closed-loop control determination module 20. Of course, the storage module may also be used to store a program, which the processing module executes upon receiving an execution instruction.

[0068] An embodiment of the present application also provides a computer storage medium, in which a computer program is stored. When the computer program runs on a computer, the computer executes the engine electronic main water pump control method as described in the above embodiment.

[0069] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented through hardware or by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0070] In summary, the present application provides an engine electronic main water pump control method, device and storage medium. In the control method, the steps of the method include, S1: obtaining a first parameter group and a knock compensation parameter of the engine in the vehicle, and judging whether the electronic main water pump in the vehicle can start the closed-loop control based on the target water temperature based on the first parameter group and the knock compensation parameter, if the judgment is yes, then enter S2; S2: judging whether the conditions for starting the knock compensation function are met based on the first parameter group and the knock compensation parameter; if the judgment result is yes, then enter S3, if the judgment result is no, then enter S5; S3: judging whether the knock compensation control offset in the knock compensation parameter is Whether to perform knock compensation, if the knock compensation control offset is greater than a preset value, then perform knock compensation and enter S4; otherwise, enter S5; S4: switch the closed-loop control strategy based on the target water temperature to an open-loop control strategy based on the target water temperature, and control the operation of the electronic main water pump by the first control parameter determined by the open-loop control strategy to perform thermal management on the engine; S5: start the closed-loop control strategy based on the target water temperature, and control the operation of the electronic main water pump by the second control parameter determined by the closed-loop control strategy to perform thermal management on the engine. This application is based on the conventional control strategy of the existing electronic main water pump, and utilizes the characteristics of the electronic main water pump engine that the cooling capacity of the water pump has a certain margin in the small and medium load knock sensitive area. When knock occurs, the target water temperature under the current working condition is open-loop controlled, and the capacity margin of the main water pump is utilized to increase the cooling intensity under the knock working condition, reduce the knock tendency, and improve the thermal efficiency of the engine.

[0071] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A method for controlling an electronic main water pump of an engine, characterized in that: include: S1: acquiring a first parameter group and a knock compensation parameter of an engine in a vehicle, and determining whether an electronic main water pump in the vehicle can start a closed-loop control based on a target water temperature based on the first parameter group and the knock compensation parameter, and if the determination is yes, entering S2; S2: determining whether a condition for enabling a knock compensation function is met based on the first parameter group and the knock compensation parameter; If the determination result is yes, then go to S3, if the determination result is no, then go to S5; S3: determining whether to perform knock compensation based on the knock compensation control offset in the knock compensation parameter; if the knock compensation control offset is greater than a preset value, performing knock compensation, and entering S4; Otherwise, go to S5; S4: switching the closed-loop control strategy based on the target water temperature to an open-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump by a first control parameter determined by the open-loop control strategy to perform thermal management on the engine; S5: starting a closed-loop control strategy based on the target water temperature, and controlling the operation of the electronic main water pump by a second control parameter determined by the closed-loop control strategy to perform thermal management on the engine.

2. The engine electronic main water pump control method according to claim 1, characterized in that: The first parameter group includes the current vehicle speed, engine speed, engine load, engine water temperature, knock identification flag and cylinder de-ignition angle caused by knock, and the knock compensation parameters include the knock compensation control module start flag and the knock compensation control offset.

3. The engine electronic main water pump control method according to claim 1, characterized in that: In step S4, the first control parameter is the sum of the latest output value obtained by the previous calculation cycle and closed-loop control stored in advance and the vibration compensation control offset.

4. The engine electronic main water pump control method according to claim 1, characterized in that: In step S5, the second control parameter is the sum of the pre-control MAP value of the electronic main water pump and the target water temperature closed-loop adjustment PID.

5. The engine electronic main water pump control method according to claim 1, characterized in that: The control of knock compensation includes: A1: Based on the second parameter group and the engine operating condition setting range, determine the knock compensation effect area and determine whether to turn on the knock compensation function. If it is determined to be yes, turn on the knock compensation function and enter A2; if it is determined to be no, the electronic main water pump speed compensation value caused by the knock is equal to 0, the knock compensation function is not turned on, and enter A4; A2: If knock is detected in at least one cylinder and the cylinder de-ignition angle caused by the knock exceeds the threshold, enter A3; if no knock is detected, the electronic main water pump compensation value caused by the knock is equal to the current value of the corresponding electronic main water pump self-learning register under the current operating condition area, and enter A4; A3: Update the self-learning value of the electronic main water pump self-learning register corresponding to the current working condition area, where the updated register learning value is equal to the sum of the old register value and the self-learning offset, and enter A4; A4: Compare the knock compensation values ​​obtained in A1, A2 and A3 with the speed margin or flow margin under the current working condition, and select the minimum value as the final value output of the knock compensation function.

6. The engine electronic main water pump control method according to claim 5, characterized in that: The second parameter group includes engine water temperature, engine speed and engine load, and the engine operating condition setting range is: the engine water temperature is greater than the first temperature and less than the second temperature, and the water pump working efficiency in the main pulse spectrum of the electronic main water pump corresponding to the engine speed and the engine load is less than the preset maximum power.

7. The engine electronic main water pump control method according to claim 5, characterized in that: In step A3, the self-learning offset is a preset water pump speed or a preset water pump flow rate.

8. The engine electronic main water pump control method according to claim 5, characterized in that: In step A2, the threshold is set between the first crankshaft angle and the second crankshaft angle.

9. An electronic main water pump control device for an engine, characterized in that: include: A closed-loop control determination module (10) acquires a first parameter group and a knock compensation parameter of an engine in a vehicle, and determines whether an electronic main water pump in the vehicle can start closed-loop control based on a target water temperature based on the first parameter group and the knock compensation parameter; A compensation condition determination module (20): if the closed-loop control determination module (10) determines that it is yes, determining whether a condition for starting a knock compensation function is met based on the first parameter group and the knock compensation parameter; A knock compensation determination module (30) is configured to determine whether to perform knock compensation based on the knock compensation control deviation in the knock compensation parameter if the compensation condition determination module (20) determines that the knock compensation is yes; If the compensation condition determination module (20) determines that it is negative, a closed-loop control strategy based on the target water temperature is started; If the knock compensation control offset is greater than a preset value, knock compensation is performed, and the closed-loop control based on the target water temperature is switched to open-loop control based on the target water temperature; if the knock compensation control offset is less than or equal to a preset value, the closed-loop control strategy based on the target water temperature is started.

10. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and when the computer program is run on a computer, the engine electronic main water pump control method according to any one of claims 1 to 8 can be executed.

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