Electronic water pump structure and control method therefor

Abstract

Disclosed in the present application are an electronic water pump structure and a control method therefor. The electronic water pump structure comprises a main liquid compartment, a main electronic water pump, a secondary liquid compartment and a secondary electronic water pump, wherein a main flow channel and a main mounting cavity, which are in communication with each other, are formed in the main liquid compartment; the main electronic water pump is mounted in the main mounting cavity and is in communication with a coolant supply pipe and a coolant return pipe by means of the main flow channel; the secondary liquid compartment is mounted outside the main liquid compartment; a liquid mixing cavity, a secondary flow channel and a secondary mounting cavity are formed in the secondary liquid compartment, and the secondary mounting cavity is in communication with the liquid mixing cavity and the secondary flow channel; and the secondary electronic water pump is mounted in the secondary mounting cavity, which is in communication with the main flow channel.

Description

Electronic water pump structure and control method thereof

[0001] This application claims priority to Chinese patent application No. 202410215927.0 filed on February 27, 2024, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electric engineering machinery, and in particular to an electronic water pump structure and a control method thereof. Background Art

[0003] With the rapid development of electric construction machinery, thermal management systems are crucial for maintaining the efficiency and performance of heat-generating components such as motors, controllers, and batteries. These components generate significant heat during operation. If heat is not dissipated promptly and effectively, it can easily lead to overheating, impacting the performance and lifespan of the equipment. Traditional thermal management systems rely on electronic water pumps to circulate antifreeze for cooling.

[0004] However, traditional thermal management systems use only one electronic water pump to dissipate heat from heat source components. The single electronic water pump has limited response time and adjustment capabilities when responding to rapidly changing cooling needs, causing heat source components such as batteries, motors, and controllers to overheat under high load, reducing their performance and service life. Technical issues

[0005] The main purpose of this application is to provide an electronic water pump structure and a control method thereof, aiming to solve the technical problem in the prior art that the response time and adjustment capability of a single electronic water pump are limited, resulting in poor heat dissipation performance of the heat source component. Technical Solutions

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides an electronic water pump structure, comprising:

[0008] A main liquid tank, wherein a horizontally arranged main channel and a main installation cavity are formed in the main liquid tank, and the main installation cavity is connected to one side of the main channel;

[0009] a main electronic water pump, the main electronic water pump being installed in the main installation cavity and being in communication with a coolant supply pipe and a coolant return pipe respectively through the main flow channel;

[0010] A secondary liquid tank is installed outside the main liquid tank, and is formed with a liquid mixing chamber, a secondary flow channel and a secondary installation chamber that are spaced and independently arranged. The secondary installation chamber is communicated with the liquid mixing chamber and the secondary flow channel respectively;

[0011] A secondary electronic water pump is installed in the secondary installation cavity, and the secondary installation cavity is communicated with the main flow channel.

[0012] In one embodiment, in the above-mentioned electronic water pump structure, the mixing chamber is connected to the coolant supply device through a first liquid inlet pipe, and the mixing chamber is connected to the auxiliary installation chamber through a first liquid discharge pipe. A first control valve is provided at the connection between the first liquid discharge pipe and the auxiliary installation chamber.

[0013] In one embodiment, in the above-mentioned electronic water pump structure, the secondary flow channel is connected to the coolant supply device through a second liquid inlet pipe, and the secondary flow channel is connected to the secondary mounting cavity through the second liquid discharge pipe, and a second control valve is provided at the connection point between the second liquid discharge pipe and the secondary mounting cavity.

[0014] In one embodiment, in the above-mentioned electronic water pump structure, a third control valve is provided at the connection point between the auxiliary installation cavity and the main channel.

[0015] In one embodiment, in the above-mentioned electronic water pump structure, a first temperature sensor is installed in the main channel, the first temperature sensor is electrically connected to a temperature controller, and the temperature controller is also electrically connected to the main electronic water pump and the auxiliary electronic water pump respectively.

[0016] In one embodiment, in the above-mentioned electronic water pump structure, a second temperature sensor is installed in the liquid mixing chamber, the second temperature sensor is electrically connected to the temperature controller, and the temperature controller is also electrically connected to the coolant supply device.

[0017] In a second aspect, the present application provides a control method for an electronic water pump structure, which is applied to a converter, a main controller, a motor, a heat exchanger, and the electronic water pump structure according to any one of claims 1 to 6, wherein the converter has a first heat sink, the main controller has a second heat sink, the motor has a third heat sink, and the heat exchanger has a fourth heat sink, and the coolant supply pipe is sequentially connected to the first heat sink, the second heat sink, the third heat sink, and the fourth heat sink;

[0018] The method comprises:

[0019] respectively acquiring a first temperature value of the first heat dissipation element, a second temperature value of the second heat dissipation element, a third temperature value of the third heat dissipation element, and a fourth temperature value of the fourth heat dissipation element;

[0020] controlling the start-up of the main electronic water pump according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value;

[0021] taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a first reference temperature value;

[0022] adjusting the current speed of the main electronic water pump to a target speed according to the first reference temperature value and a preset temperature value interval;

[0023] When the target speed of the main electronic water pump is equal to its rated speed, the auxiliary electronic water pump is started to assist the main electronic water pump in cooling the first heat sink, the second heat sink, the third heat sink, and the fourth heat sink.

[0024] In one embodiment, in the control method of the electronic water pump structure, the step of controlling the start-up of the main electronic water pump according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value includes:

[0025] When the first temperature value is greater than the first preset temperature value, or the second temperature value is greater than the first preset temperature value, or the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, the main electronic water pump is started to operate at the target speed;

[0026] When the first temperature value is equal to the first preset temperature value, the second temperature value is equal to the first preset temperature value, the third temperature value is equal to the second preset temperature value, or the fourth temperature value is equal to the third preset temperature value, the main electronic water pump is started to run at 0.5 times the rated speed.

[0027] In one embodiment, in the control method of the electronic water pump structure, after the step of controlling the start-up of the main electronic water pump according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value, the method further includes:

[0028] When the first temperature value and the second temperature value are both lower than a first preset temperature value, the third temperature value is lower than a second preset temperature value, and the fourth temperature value is lower than a third preset temperature value, the main electronic water pump is turned off.

[0029] In one embodiment, in the control method of the electronic water pump structure, before the step of starting the main electronic water pump to operate at the target speed when the first temperature value is greater than the first preset temperature value, the second temperature value is greater than the first preset temperature value, the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, the method further includes:

[0030] taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a second reference temperature value;

[0031] If the second reference temperature value meets a preset condition, the main electronic water pump is used to dissipate heat from the first heat sink, the second heat sink, the third heat sink, and the fourth heat sink;

[0032] If the second reference temperature value does not meet the preset condition, the auxiliary electronic water pump is used to dissipate heat for the first heat sink, the second heat sink, the third heat sink and the fourth heat sink until the second reference temperature value meets the preset condition, and then the process returns to execute the "if so, the main electronic water pump is used to dissipate heat for the first heat sink, the second heat sink, the third heat sink and the fourth heat sink." Beneficial effects

[0033] The present application proposes an electronic water pump structure and a control method thereof. By simultaneously setting a main electronic water pump and a sub-electronic water pump, the sub-electronic water pump can assist the main electronic water pump. The sub-electronic water pump can perform step-by-step cooling of heating components such as the motor, main controller, and battery in the electric engineering machinery according to the actual operating state of the electric machinery, thereby reducing the damage rate of heating components such as the motor, main controller, and battery of the electric engineering machinery, and increasing the service life of the heating components and the coolant return pipe of the electric engineering machinery; the sub-electronic water pump can also replace the main electronic water pump to cool the heating components of the electric engineering machinery when the main electronic water pump is not started. Cooling can prevent the main electronic water pump from being in continuous operation and reducing its service life. Moreover, after the main electronic water pump reaches its rated speed, it can also cooperate with the main electronic water pump to cool the heating components of the electric engineering machinery. The present application reduces the reaction time required to start the main electronic water pump and the auxiliary electronic water pump by setting the main electronic water pump and the auxiliary electronic water pump at the same time, improves the cooling and adjustment capabilities of the main electronic water pump and the auxiliary electronic water pump for heat source components such as batteries, motors and controllers, improves the cooling efficiency to improve the cooling effect, ensures the performance and service life of the heat dissipation components, and ensures the operational stability of the electric engineering machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these provided drawings without any creative work.

[0035] FIG1 is a schematic structural diagram of an electronic water pump structure in one embodiment of the present application;

[0036] FIG2 is a schematic structural diagram of a main liquid tank and a secondary liquid tank in one embodiment of the present application;

[0037] 3 is a schematic structural diagram of the first heat dissipation element, the second heat dissipation element, the third heat dissipation element, and the fourth heat dissipation element in one embodiment of the present application;

[0038] FIG4 is a flow chart of a control method for an electronic water pump structure according to an embodiment of the present application;

[0039] FIG5 is a schematic diagram of a detailed process of step S20 in FIG4 ;

[0040] FIG. 6 is a schematic diagram of the process before step S21 in FIG. 5 .

[0041] Description of Figure Numbers:

[0042] Reference number name Reference number name 100 Main liquid tank 200 Main electronic water pump 300 Coolant supply pipe 400 Coolant return pipe 500 Auxiliary liquid tank 600 Auxiliary electronic water pump 700 First liquid inlet pipe 81 First heat sink 82 Second heat sink 83 Third heat sink 84 Fourth heat sink

[0043] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0044] In order to make the purpose, technical solutions and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of this application.

[0045] It should be noted that in the embodiments of the present application, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In this application, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the statement "comprises..." does not exclude the presence of other identical elements in the process, method, article or system comprising the element. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, scheme B, or a scheme in which both A and B are satisfied.

[0047] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection between two elements or the interaction relationship between two elements.

[0048] In this application, if there are descriptions involving "first," "second," etc., such descriptions are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0049] In this application, suffixes such as "module," "component," "part," "component," or "unit" used to represent elements are used only to facilitate the description of this application and have no specific meaning. Therefore, "module," "component," or "unit" may be used interchangeably.

[0050] For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the technical solutions of the various embodiments can be combined with each other, but this is based on the fact that it can be implemented by those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0051] The inventive concept of this application is further explained below with reference to some specific implementation methods.

[0052] The present application proposes an electronic water pump structure and a control method thereof.

[0053] 1 and 2 , FIG1 is a schematic structural diagram of an electronic water pump structure in one embodiment of the present application; FIG2 is a schematic structural diagram of a main liquid tank and an auxiliary liquid tank in one embodiment of the present application.

[0054] In one embodiment of the present application, as shown in Figures 1 and 2, an electronic water pump structure includes a main liquid tank 100, a main electronic water pump 200, a subsidiary liquid tank 500 and a subsidiary electronic water pump 600. A horizontally arranged main channel and a main installation cavity are formed in the main liquid tank 100, and the main installation cavity is connected to one side of the main channel; the main electronic water pump 200 is installed in the main installation cavity and is connected to the coolant supply pipe 300 and the coolant return pipe 400 respectively through the main channel; the subsidiary liquid tank 500 is installed outside the main liquid tank 100, and the subsidiary liquid tank 500 is formed with a mixing chamber, a subsidiary flow channel and a subsidiary installation cavity that are separated and independently arranged, and the subsidiary installation cavity is connected to the mixing chamber and the subsidiary flow channel respectively; the subsidiary electronic water pump 600 is installed in the subsidiary installation cavity, and the subsidiary installation cavity is connected to the main channel.

[0055] It should be noted that the electronic water pump structure is used in electric engineering machinery, and antifreeze is delivered to the motor, the main controller of the electric engineering machinery, the battery and other heat-generating components through the coolant supply pipe 300, i.e., the water pipe, to meet the flow requirements of the motor, the main controller of the electric engineering machinery, the battery and other heat-generating components under any working conditions of the vehicle, and to promptly bring the heat to the heat exchanger for dissipation.

[0056] It should be understood that the auxiliary liquid tank 500 is installed on the top of the main liquid tank 100 to make the overall structure of the electronic water pump structure compact, and the auxiliary electronic water pump 600 is used to assist or replace the main electronic water pump 200 to supply coolant to the coolant supply pipe 300.

[0057] As an optional implementation of this embodiment, when the main electronic water pump 200 can meet the heat dissipation requirements of heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, the auxiliary electronic water pump 600 is in a shutdown state, that is, the auxiliary electronic water pump 600 does not start before the speed of the main electronic water pump 200 reaches its rated speed. Only when the speed of the main electronic water pump 200 reaches its rated speed, the auxiliary electronic water pump 600 starts to run. In this state, the auxiliary electronic water pump 600 is used to assist the main electronic water pump 200 to pump the coolant in the external coolant supply device from the auxiliary liquid tank 500 into the coolant supply pipe 300.

[0058] Specifically, when the speed of the main electronic water pump 200 reaches its rated speed, the coolant in the coolant supply pipe 300 is pumped by the auxiliary electronic water pump 600 and the main electronic water pump 200 together, which is used to increase the coolant flow in the coolant supply pipe 300, so as to improve the heat dissipation performance of heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, and ensure the normal operation of the electric engineering machinery.

[0059] As another optional implementation manner of this embodiment, the coolant return pipe 400 is also connected to the mixing chamber. Before the main electronic water pump 200 pumps coolant into the coolant supply pipe 300, the auxiliary electronic water pump 600 first continuously pumps coolant into the coolant supply pipe 300. After the coolant after heat exchange is returned into the mixing chamber through the coolant return pipe 400, the coolant in the external coolant supply device is passed into the mixing chamber, so that the coolant after heat exchange through the coolant return pipe 400 and the coolant pumped into the mixing chamber from the external coolant supply device are mixed, and the temperature of the coolant is adjusted so that the temperature of the coolant in the mixing chamber is the difference between the highest temperature and the lowest temperature of the heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, thereby performing step-by-step cooling of the heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, reducing the damage rate of the heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, and increasing the service life of the heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, as well as the coolant return pipe 400.

[0060] Since the performance and reliability of the electronic water pump are highly dependent on the integrity and stability of the vehicle's electronic system, any power instability or electronic control system failure may affect the normal operation of the electronic water pump. Therefore, it can be seen from the above two embodiments that the main electronic water pump 200 and the auxiliary electronic water pump 600 cooperate to dissipate heat from the heat source component, which can not only effectively reduce the risk of the thermal management system not operating, but also provide a basic condition for the heat dissipation implementation of the heat source component, so that the electronic water pump structure has the ability to flexibly adjust to implement heat dissipation, i.e. cooling, according to the heating conditions of the heat source component, so that the cooling system can adjust the operating state according to the actual cooling needs, and stop the main electronic water pump 200 and / or the auxiliary electronic water pump 600 when full cooling is not required, so as to save energy and avoid The main electronic water pump 200 or the auxiliary electronic water pump 600 directly consumes the battery energy of the electric engineering machinery during continuous operation, thereby improving the cruising range of the electric engineering machinery; the electronic water pump structure composed of the main electronic water pump 200 and the auxiliary electronic water pump 600 improves the flexibility and adaptability of the cooling system, improves the ability of the thermal management system, i.e., the cooling system, to be optimized under different working conditions, and improves the effectiveness and efficiency of the thermal management system when facing changing working conditions; the electronic water pump structure does not rely on a single water pump to dissipate heat and cool heat source components, thereby preventing excessive use of the main electronic water pump 200 or the auxiliary electronic water pump 600 and accelerating its wear and tear, reducing the risk of shutdown of the thermal management system, and improving the reliability and life of the entire thermal management system.

[0061] The electronic water pump structure improves cooling efficiency by using a dual water pump arrangement, enhances the responsiveness, flexibility and adaptability of the thermal management system, and broadens the upgrade and scalability limits of electric engineering machinery.

[0062] It is worth noting that the rated power of the auxiliary electronic water pump 600 is smaller than the rated power of the main electronic water pump 200, and the size of the auxiliary electronic water pump 600 is smaller than that of the main electronic water pump 200. Both the main electronic water pump 200 and the auxiliary electronic water pump 600 can be in a normally closed state, that is, when the electric engineering machinery vehicle is powered on, neither the main electronic water pump 200 nor the auxiliary electronic water pump 600 is started. When heat dissipation is needed, the auxiliary electronic water pump 600 is started first to dissipate heat from the heat source components to save energy.

[0063] The technical solution of the present application is to simultaneously set up a main electronic water pump 200 and an auxiliary electronic water pump 600. The auxiliary electronic water pump 600 can assist the main electronic water pump 200. The auxiliary electronic water pump 600 can perform step-by-step cooling of the motor, main controller, battery and other heating components in the electric engineering machinery according to the actual operating state of the electric machinery, thereby reducing the damage rate of the motor, main controller, battery and other heating components of the electric engineering machinery, and increasing the service life of the heating components of the electric engineering machinery and the coolant return pipe 400; the auxiliary electronic water pump 600 can also replace the main electronic water pump 200 to cool the heating components of the electric engineering machinery when the main electronic water pump 200 is not started, thereby avoiding the main electric machinery from being damaged. The sub-water pump 200 is continuously in operation, which reduces its service life. Moreover, after the main electronic water pump 200 reaches its rated speed, it can also cooperate with the main electronic water pump 200 to cool the heat-generating components of the electric engineering machinery. The present application reduces the reaction time required to start the main electronic water pump 200 and the sub-electronic water pump 600 by simultaneously setting the main electronic water pump 200 and the sub-electronic water pump 600, improves the cooling and regulation capabilities of the main electronic water pump 200 and the sub-electronic water pump 600 on heat source components such as batteries, motors and controllers, improves the cooling efficiency to improve the cooling effect, ensures the performance and service life of the heat dissipation components, and ensures the operational stability of the electric engineering machinery.

[0064] Continue to refer to Figures 1 and 2.

[0065] In one embodiment, as shown in Figures 1 and 2, the mixing chamber is connected to the coolant supply device through a first liquid inlet pipe 700, and the mixing chamber is connected to the auxiliary installation chamber through a first liquid discharge pipe. A first control valve is provided at the connection between the first liquid discharge pipe and the auxiliary installation chamber.

[0066] It should be noted that the first control valve can be a pneumatic valve, a one-way valve, an electronic valve, a rotary valve or a switching valve in the prior art, which is used to control the on-off of the first discharge pipe. When the first control valve is in a closed state, the mixing chamber is not connected to the auxiliary installation chamber, so as to achieve the effect of blocking the flow of the coolant in the mixing chamber, thereby providing mixing time for the mixing process of the coolant after heat exchange and the coolant pumped into the mixing chamber from the external coolant supply device through the coolant return pipe 400. After the liquid in the mixing chamber is mixed, the first control valve is opened, and the mixing chamber is connected to the auxiliary installation chamber, so that the mixed coolant is pumped in through the coolant supply pipe 300 by the auxiliary electronic water pump 600.

[0067] It should be understood that when there is no need to use the mixing chamber to mix the coolant, the first control valve is in a normally open state, so that when the speed of the main electronic water pump 200 reaches its rated speed, the auxiliary electronic water pump 600 can assist the main electronic water pump 200 to quickly pump the coolant into the coolant supply pipe 300, thereby improving the cooling efficiency of heat-generating components such as motors, main controllers of electric engineering machinery, batteries, etc.

[0068] In one embodiment, the secondary flow channel is connected to the coolant supply device through a second liquid inlet pipe, and the secondary flow channel is connected to the secondary installation cavity through a second liquid discharge pipe. A second control valve is provided at the connection between the second liquid discharge pipe and the secondary installation cavity.

[0069] It should be noted that the second control valve is arranged in the same manner as the first control valve.

[0070] It should be understood that when the speed of the main electronic water pump 200 reaches its rated speed, since the auxiliary installation cavity is directly connected to the external coolant supply device through the second drain pipe, the coolant in the external coolant supply device can be directly pumped into the coolant supply pipe 300 through the auxiliary electronic water pump 600 without passing through the mixing chamber, saving the coolant delivery path, improving the coolant delivery efficiency, and thus improving the cooling efficiency of heat-generating components such as motors, main controllers of electric engineering machinery, batteries, etc.

[0071] In one embodiment, a third control valve is provided at the connection point between the auxiliary installation cavity and the main channel.

[0072] It should be noted that the third control valve is configured similarly to the first control valve.

[0073] It should be understood that in order to prevent the coolant flowing from the main channel through the coolant supply pipe 300 from overflowing into the auxiliary liquid tank 500, the third control valve is in a normally closed state.

[0074] In one embodiment, a first temperature sensor is installed in the main flow channel. The first temperature sensor is electrically connected to a temperature controller. The temperature controller is also electrically connected to the main electronic water pump 200 and the auxiliary electronic water pump 600 respectively.

[0075] It should be understood that the first temperature sensor is used to obtain the temperature of the coolant flowing into the coolant supply pipe 300 through the main channel.

[0076] As an optional implementation of this embodiment, the coolant refluxed through the coolant return pipe 400 can also be directly mixed with heat in the main channel. The heat mixing process is the same as the heat mixing process in the liquid mixing chamber. The first temperature sensor is used to obtain the temperature of the coolant after heat mixing in the main channel in real time, thereby accurately performing step-by-step cooling on heat-generating components such as motors, main controllers of electric engineering machinery, and batteries.

[0077] In one embodiment, a second temperature sensor is installed in the liquid mixing chamber, the second temperature sensor is electrically connected to the temperature controller, and the temperature controller is also electrically connected to the cooling liquid supply device.

[0078] It should be understood that the second temperature sensor is used to obtain the temperature of the coolant after mixing in the mixing chamber in real time, so as to accurately perform step-by-step cooling on heating components such as the motor, the main controller of the electric engineering machinery, and the battery.

[0079] In addition, based on the same inventive concept, the present application also proposes a control method for an electronic water pump structure.

[0080] Continuing to refer to Figures 1 and 2, and to Figures 3 and 4, Figure 3 is a structural schematic diagram of the first heat sink, the second heat sink, the third heat sink and the fourth heat sink in one embodiment of the present application; Figure 4 is a flow chart of a control method for the electronic water pump structure in one embodiment of the present application.

[0081] In one embodiment of the present application, as shown in Figures 1 to 4, a control method for an electronic water pump structure is applied to a converter, a main controller, a motor, a heat exchanger, and the electronic water pump structure in the above embodiment. The converter has a first heat sink 81, the main controller has a second heat sink 82, the motor has a third heat sink 83, and the heat exchanger has a fourth heat sink 84. The coolant supply pipe 300 is sequentially connected to the first heat sink 81, the second heat sink 82, the third heat sink 83, and the fourth heat sink 84.

[0082] The method comprises:

[0083] Step S10, respectively acquiring a first temperature value of the first heat dissipation element 81, a second temperature value of the second heat dissipation element 82, a third temperature value of the third heat dissipation element 83, and a fourth temperature value of the fourth heat dissipation element 84;

[0084] Step S20, controlling the start-up of the main electronic water pump 200 according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value;

[0085] Step S30: taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a first reference temperature value;

[0086] Step S40: adjusting the current speed of the main electronic water pump 200 to a target speed according to the first reference temperature value and the preset temperature value interval;

[0087] Step S50 : When the target speed of the main electronic water pump 200 is equal to its rated speed, the auxiliary electronic water pump 600 is started to assist the main electronic water pump 200 in dissipating heat from the first heat sink 81 , the second heat sink 82 , the third heat sink 83 and the fourth heat sink 84 .

[0088] It should be noted that the specific structure of the electronic water pump structure refers to the above embodiments. Since the control method of the electronic water pump structure adopts all the technical solutions of all the above embodiments, it at least has all the effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0089] It should be understood that in order to ensure the cooling effect of heat-generating components such as the DCDC converter, motor, main controller of electric engineering machinery, battery, etc., the speed adjustment amplitude of the main electronic water pump 200 is adjusted according to the highest temperature value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value, that is, the first reference temperature value.

[0090] In addition, in order to prevent mechanical failure from causing cooling failure, a forced start button for the main electronic water pump 200 is added to the cab display screen of the electric engineering machinery. When the forced start button is triggered, the main electronic water pump 200 runs at its rated speed.

[0091] It is worth noting that the preset temperature value range is different according to the first heat dissipation member 81, the second heat dissipation member 82, the third heat dissipation member 83 and the fourth heat dissipation member 84. The preset temperature value range of the first heat dissipation member 81 is 40℃~60℃, the preset temperature value range of the second heat dissipation member 82 is 40℃~60℃, the preset temperature value range of the third heat dissipation member 83 is 60℃~80℃, and the preset temperature value range of the fourth heat dissipation member 84 is 43℃~53℃.

[0092] 1 to 4 , and also to FIG. 5 , FIG. 5 is a schematic diagram of a detailed flow chart of step S20 in FIG. 4 .

[0093] In one embodiment, as shown in FIG1 to FIG5 , the step of controlling the start-up of the main electronic water pump 200 according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value includes:

[0094] Step S21: When the first temperature value is greater than the first preset temperature value, or the second temperature value is greater than the first preset temperature value, or the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, starting the main electronic water pump 200 to operate at the target speed;

[0095] Step S22: When the first temperature value is equal to the first preset temperature value, the second temperature value is equal to the first preset temperature value, the third temperature value is equal to the second preset temperature value, or the fourth temperature value is equal to the third preset temperature value, start the main electronic water pump 200 and run it at 0.5 times the rated speed.

[0096] It should be noted that the first preset temperature value is 40°C, the second preset temperature value is 60°C, and the third preset temperature value is 43°C.

[0097] It should be understood that the DCDC, that is, the speed of the main electronic water pump 200 is linearly adjusted when the converter temperature is 40°C~60°C or the main controller temperature is 40°C-60°C or the motor is 60°C~80°C or the radiator inlet water temperature is 43°C~53°C: when the first temperature value is equal to the first preset temperature value or the second temperature value is equal to the first preset temperature value or the third temperature value is equal to the second preset temperature value or the fourth temperature value is equal to the third preset temperature value, the speed of the main electronic water pump 200 is 50% of its rated speed.

[0098] When the first temperature value is greater than or equal to 60°C, or the second temperature value is greater than or equal to 60°C, or the third temperature value is greater than or equal to 80°C, or the fourth temperature value is greater than or equal to 53°C, the speed of the main electronic water pump 200 is equal to its rated speed.

[0099] It is worth noting that when the main electronic water pump 200 operates at 50% of its rated speed, the temperature ranges corresponding to the highest temperature values ​​in the first heat sink 81, the second heat sink 82, the third heat sink 83 and the fourth heat sink 84 are 40°C~60°C, 40°C-60°C, 60°C~80°C, and 43°C~53°C, respectively. Among them, within the temperature range corresponding to the highest temperature value, i.e., the first reference temperature value, the speed of the main electronic water pump 200 increases by 5% of its rated speed for every 1°C increase in temperature.

[0100] In one embodiment, after the step of controlling the start-up of the main electronic water pump 200 according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value, the method further includes:

[0101] Step F10 , when the first temperature value and the second temperature value are both lower than the first preset temperature value, the third temperature value is lower than the second preset temperature value, and the fourth temperature value is lower than the third preset temperature value, turning off the main electronic water pump 200 .

[0102] It should be understood that when the temperature of the DCDC converter and the controller, that is, the temperature values ​​of the first heat sink 81 and the second heat sink 82 are below 40°C and the temperature value of the motor, that is, the third heat sink 83, is 60°C and the water inlet temperature of the radiator, that is, the fourth heat sink 84, is below 43°C, the main electronic water pump 200 is shut down to prevent the main electronic water pump 200 from being in continuous operation for a long time, so as to save energy of the electric engineering machinery and increase the service life of the main electronic water pump 200.

[0103] 1 to 5 , and also FIG. 6 , FIG. 6 is a schematic diagram of the flow chart before step S21 in FIG. 5 .

[0104] In one embodiment, as shown in FIG1 to FIG6 , before the step of starting the main electronic water pump 200 to operate at the target speed when the first temperature value is greater than the first preset temperature value, the second temperature value is greater than the first preset temperature value, the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, the method further includes:

[0105] Step E10: taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a second reference temperature value;

[0106] Step E20: determining whether the second reference temperature value meets a preset condition;

[0107] Step E30: If yes, use the main electronic water pump 200 to dissipate heat from the first heat sink 81 , the second heat sink 82 , the third heat sink 83 , and the fourth heat sink 84 ;

[0108] Step E40: If not, use the auxiliary electronic water pump 600 to dissipate heat for the first heat sink 81, the second heat sink 82, the third heat sink 83 and the fourth heat sink 84 until the second reference temperature value meets the preset condition, and return to execute the step of: If yes, use the main electronic water pump 200 to dissipate heat for the first heat sink 81, the second heat sink 82, the third heat sink 83 and the fourth heat sink 84.

[0109] It should be understood that, in step E20, after subtracting the second temperature reference value from 40° C., if the difference between the second temperature reference value and 40° C. is less than 5° C., the second reference temperature value satisfies the preset condition; otherwise, the second reference temperature value does not satisfy the preset condition.

[0110] After the second reference temperature value does not meet the preset conditions, the auxiliary electronic water pump 600 is started, and according to the steps in the above embodiment, after the coolant is mixed with heat in the mixing chamber, the mixed coolant is pumped into the coolant supply pipe 300 through the auxiliary electronic water pump 600, thereby performing step-by-step cooling of heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, thereby reducing the damage rate of heat-generating components such as the motor, the main controller of the electric engineering machinery, and the battery, and increasing the service life of the motor, the main controller of the electric engineering machinery, the battery, and other heat-generating components and the coolant return pipe 400.

[0111] The control method of this electronic water pump structure provides a more intelligent, efficient and reliable control implementation basis for electric engineering machinery, enabling the thermal management system to dynamically adjust its cooling performance using the main electronic water pump 200 and the auxiliary electronic water pump 600 to adapt to different working conditions and needs, thereby optimizing energy use, extending equipment service life, and reducing maintenance costs.

[0112] Finally, it should be noted that the serial numbers of the above embodiments of this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above embodiments are only optional embodiments of this application and do not limit the scope of the patent of this application. All equivalent structures or equivalent process changes made by using the contents of the description and drawings of this application under the inventive concept of this application, or directly or indirectly applied in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An electronic water pump structure, wherein: The electronic water pump structure comprises: A main liquid tank (100), wherein a main flow channel and a main installation cavity are formed in the main liquid tank (100), and the main installation cavity is connected to one side of the main flow channel; a main electronic water pump (200), the main electronic water pump (200) being installed in the main installation cavity and being in communication with the coolant supply pipe (300) and the coolant return pipe (400) respectively through the main flow channel; A secondary liquid tank (500), the secondary liquid tank (500) is installed outside the main liquid tank (100), the secondary liquid tank (500) is formed with a liquid mixing chamber, a secondary flow channel and a secondary installation chamber that are spaced and independently arranged, and the secondary installation chamber is communicated with the liquid mixing chamber and the secondary flow channel respectively; A secondary electronic water pump (600) is installed in the secondary installation cavity, and the secondary installation cavity is communicated with the main flow channel.

2. The electronic water pump structure according to claim 1, wherein: The liquid mixing chamber is connected to the cooling liquid supply device via a first liquid inlet pipe (700), and the liquid mixing chamber is connected to the auxiliary installation chamber via a first liquid discharge pipe. A first control valve is provided at the connection point between the first liquid discharge pipe and the auxiliary installation chamber.

3. The electronic water pump structure according to claim 2, wherein: The secondary flow channel is connected to the coolant supply device through a second liquid inlet pipe, and the secondary flow channel is connected to the secondary installation cavity through the second liquid discharge pipe. A second control valve is provided at the connection point between the second liquid discharge pipe and the secondary installation cavity.

4. The electronic water pump structure according to claim 3, wherein: A third control valve is provided at the connection point between the auxiliary installation cavity and the main flow channel.

5. The electronic water pump structure according to claim 4, wherein: A first temperature sensor is installed in the main flow channel, and the first temperature sensor is electrically connected to a temperature controller, and the temperature controller is also electrically connected to the main electronic water pump (200) and the auxiliary electronic water pump (600), respectively.

6. The electronic water pump structure according to any one of claims 2 to 5, wherein: A second temperature sensor is installed in the liquid mixing chamber. The second temperature sensor is electrically connected to the temperature controller. The temperature controller is also electrically connected to the cooling liquid supply device.

7. A control method for an electronic water pump structure, wherein: Applicable to a converter, a main controller, a motor, a heat exchanger, and the electronic water pump structure according to any one of claims 1 to 6, wherein the converter has a first heat sink (81), the main controller has a second heat sink (82), the motor has a third heat sink (83), the heat exchanger has a fourth heat sink (84), and the coolant supply pipe (300) is sequentially connected to the first heat sink (81), the second heat sink (82), the third heat sink (83), and the fourth heat sink (84); The method comprises: respectively acquiring a first temperature value of the first heat dissipation element (81), a second temperature value of the second heat dissipation element (82), a third temperature value of the third heat dissipation element (83), and a fourth temperature value of the fourth heat dissipation element (84); controlling the start-up of the main electronic water pump (200) according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value; taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a first reference temperature value; adjusting the current rotation speed of the main electronic water pump (200) to a target rotation speed according to the first reference temperature value and a preset temperature value interval; When the target speed of the main electronic water pump (200) is equal to its rated speed, the auxiliary electronic water pump (600) is started to assist the main electronic water pump (200) in dissipating heat from the first heat sink (81), the second heat sink (82), the third heat sink (83) and the fourth heat sink (84).

8. The control method of the electronic water pump structure according to claim 7, wherein: The step of controlling the start-up of the main electronic water pump (200) according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value comprises: When the first temperature value is greater than the first preset temperature value, or the second temperature value is greater than the first preset temperature value, or the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, starting the main electronic water pump (200) to operate at the target speed; When the first temperature value is equal to the first preset temperature value, the second temperature value is equal to the first preset temperature value, the third temperature value is equal to the second preset temperature value, or the fourth temperature value is equal to the third preset temperature value, the main electronic water pump (200) is started to run at 0.5 times the rated speed.

9. The control method of the electronic water pump structure according to claim 8, wherein: After the step of controlling the start-up of the main electronic water pump (200) according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value, the method further comprises: When the first temperature value and the second temperature value are both lower than a first preset temperature value, the third temperature value is lower than a second preset temperature value, and the fourth temperature value is lower than a third preset temperature value, the main electronic water pump (200) is turned off.

10. The control method of the electronic water pump structure according to claim 8, wherein: Before the step of starting the main electronic water pump (200) to operate at the target speed when the first temperature value is greater than the first preset temperature value, the second temperature value is greater than the first preset temperature value, the third temperature value is greater than the second preset temperature value, or the fourth temperature value is greater than the third preset temperature value, the method further comprises: taking the maximum value among the first temperature value, the second temperature value, the third temperature value and the fourth temperature value as a second reference temperature value; If the second reference temperature value meets a preset condition, the main electronic water pump (200) is used to dissipate heat from the first heat sink (81), the second heat sink (82), the third heat sink (83), and the fourth heat sink (84); If the second reference temperature value does not meet the preset condition, the auxiliary electronic water pump (600) is used to dissipate heat from the first heat sink (81), the second heat sink (82), the third heat sink (83) and the fourth heat sink (84) until the second reference temperature value meets the preset condition, and the process returns to the step of: if so, dissipating heat from the first heat sink (81), the second heat sink (82), the third heat sink (83) and the fourth heat sink (84) by using the main electronic water pump (200).

Images