Electronic oil pump efficient internal circulation heat dissipation structure and control method

Abstract

The invention relates to the technical field of electronic oil pumps, in particular to an efficient internal circulation heat dissipation structure of an electronic oil pump and a control method. The interior of the outer shell is hollow, and the pump cover is arranged at an opening of the outer shell; the controller is arranged at the closed end of the shell; the center shaft is arranged in the shell in the axial direction, and the two ends of the center shaft are communicated to form a first oil channel of a hollow structure; a first assembling space used for assembling a pump body, a second assembling space used for assembling a motor and a third assembling space used for assembling a controller are sequentially formed in the inner space of the outer shell in the axis direction, one end of the first oil liquid channel is opposite to the oil inlet, and the other end of the first oil liquid channel is opposite to the second assembling space. A second oil channel is formed at the joint of the second assembly space and the third assembly space, and a third oil channel is formed between the inner side face of the outer shell and the outer diameter of the controller at intervals; internal circulation heat exchange efficiency of the electronic oil pump is improved, and working efficiency and service life of products are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic oil pumps, and in particular to a high-efficiency internal circulation heat dissipation structure and a control method for an electronic oil pump. Background Art

[0002] The electronic fuel pump is the core component of the fuel supply system. Its main function is to transport fuel from the fuel tank to the engine's fuel injection system and provide stable fuel pressure to ensure the normal operation of the engine. It is generally composed of a motor, a pump body, a one-way valve and other components.

[0003] The electronic oil pump generates a lot of heat during operation. If the heat cannot be dissipated in time, the internal temperature of the electronic oil pump will rise, affecting the performance and life of the motor, and even causing failures. In related technologies, a small amount of oil enters the motor cavity through the gap between the shaft and the pump housing, and heat is exchanged with the motor and controller through the oil medium. However, the oil circulation volume is small, the heat exchange volume is limited, and the heat exchange efficiency is low, which cannot take away the excess heat inside the electronic oil pump. In the process of heat exchange between the oil and the controller, since the oil cannot fully enter the gap between the controller and the inner side of the electronic oil pump housing, effective heat exchange cannot be carried out, and air entrapment is prone to occur. The instantaneous impact and high temperature generated will corrode the internal components of the oil pump, causing parts wear and leakage, thereby reducing working efficiency and service life. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electronic oil pump with a high-efficiency internal circulation heat dissipation structure and a control method, thereby improving the internal circulation heat exchange efficiency of the electronic oil pump and ensuring the working efficiency and service life of the product.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: an electronic oil pump high-efficiency internal circulation heat dissipation structure, comprising: A pump cover is provided with an oil inlet; The outer shell is hollow inside, and the pump cover is arranged at the opening of the shell; a controller, equipped with a plurality of electronic components, disposed at the closed end of the housing; A central shaft is axially arranged in the housing, with both ends penetrating to form a first oil channel of a hollow structure; In which, the internal space of the outer shell forms a first assembly space for assembling the pump body, a second assembly space for assembling the motor and a third assembly space for assembling the controller in sequence along the axial direction, one end of the first oil channel is arranged opposite to the oil inlet, and the other end is arranged opposite to the second assembly space, a second oil channel is formed at the connection between the second assembly space and the third assembly space, and a third oil channel is formed between the inner side surface of the outer shell and the outer diameter of the controller.

[0006] Furthermore, the outer shell includes a motor housing, a pump housing and an end cover. The motor housing is a structure with two open ends and provides the first assembly space. The pump cover is assembled at one open end of the motor housing. The pump housing is arranged in the first assembly space, and the flange surface cooperates with the pump cover. The end cover is a structure with one end open and provides the third assembly space. The open end of the end cover is sealed and connected to the other open end of the motor housing, and the second assembly space is provided at the connection.

[0007] Furthermore, the inner axial surface of the end cover is provided with a plurality of first strip-shaped grooves along the axial direction, the outer axial surface of the controller is arranged in contact with the inner axial surface of the end cover, and the first strip-shaped grooves form the third oil channel.

[0008] Furthermore, the inner axial surface of the motor housing is provided with a plurality of second strip-shaped grooves along the axial direction, the outer axial surface of the pump housing is arranged in abutment with the inner axial surface of the motor housing, and a first through-hole groove is provided on the flange surface, the second strip-shaped groove is spaced apart from the outer surface of the pump housing, and is connected with the first through-hole groove to form a first oil return branch.

[0009] Furthermore, a second through hole groove is formed on the end surface of the pump housing located in the first assembly space, and the second through hole groove is connected with the first assembly space and the second assembly space to form a second oil return branch.

[0010] Furthermore, the electronic component includes a first temperature monitoring element and a second temperature monitoring element. The first temperature sensing element is used to monitor the temperature data of the first assembly space in real time, and the second temperature monitoring element is used to sense the temperature data of the third assembly space in real time.

[0011] The present invention also provides a method for controlling high-efficiency internal circulation heat dissipation of an electronic oil pump, using the high-efficiency internal circulation heat dissipation structure of the electronic oil pump as described in any one of the above items, comprising the following steps: The oil enters the first oil channel from the oil inlet, and the first oil channel guides the oil into the second assembly space; The oil in the second assembly space contacts and transfers heat with one side of the controller when passing through the second oil channel, and is then merged into the third assembly space; The oil in the third assembly space enters between the controller and the closed end of the outer shell through the third oil channel, and contacts and transfers heat to the other side of the controller; The oil returns to the oil inlet from the third oil channel or the second oil channel through the oil return channels in the second assembly space and the first assembly space in sequence, thus establishing an oil circuit circulation.

[0012] Furthermore, the method further includes the following steps: When the oil circuit circulates, collecting and monitoring in real time a first temperature in the first assembly space and a second temperature in the third assembly space; When the first temperature and the second temperature are within a normal operating threshold range, the oil flow rate is controlled to be in a working state; When the first temperature or the second temperature exceeds the normal operating threshold range, controlling the oil flow rate to be in a normal temperature control state; When both the first temperature and the second temperature exceed the normal operating threshold range, the oil flow rate is controlled to be in an emergency temperature control state.

[0013] Furthermore, controlling the oil flow rate to be in a conventional temperature control state includes the following steps: Increasing the oil flow rate to increase the number of oil circuit cycles per unit time, so that the first temperature or the second temperature is reduced to within the normal operating threshold range; determining a temperature difference between the first temperature and the second temperature, and determining whether the temperature difference is within a controllable threshold range; When the temperature difference exceeds the controllable threshold range, the oil flow rate is controlled to enter an emergency temperature control state; When the temperature difference is within the controllable threshold range, a dynamic connection is established between the temperature difference and the oil volume ratio between the oil entering the return oil channel from the second oil channel and the oil entering the return oil channel from the third oil channel, and the synchronous oil distribution mode is entered.

[0014] Furthermore, controlling the oil flow rate to be in an emergency temperature control state includes the following steps: adjusting the oil flow rate to automatically enter a low-power operation mode, and determining in real time a temperature change gradient between the first temperature and the second temperature; When the temperature change gradient is a positive transformation, or the temperature change gradient is a negative transformation and exceeds the warning threshold range, an alarm is issued and an emergency braking operation is performed; When the temperature change gradient is reversely transformed and the temperature change gradient value is within the warning threshold range, a dynamic connection is established between the temperature change gradient and the oil volume ratio between the oil entering the return oil channel from the second oil channel and the oil entering the return oil channel from the third oil channel, and the low-power return oil distribution mode is entered.

[0015] The beneficial effects of the present invention are as follows: the first oil channel formed by the central axis of the hollow structure of the present invention can directly transport the oil to the second space for direct heat exchange with the motor, and then fully contact the oil with the controller through the second oil channel and the third oil channel to achieve efficient heat dissipation of the motor and the controller; in this process, a complete internal circulation oil circuit is formed through the cooperation of the first oil channel, the second oil channel and the third oil channel, which improves the oil circuit circulation in the electronic oil pump, significantly increases the amount of oil flowing through the motor and controller area, avoids the occurrence of trapped air and causes local high temperature, and ensures component performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a high-efficiency internal circulation heat dissipation structure of an electronic oil pump according to an embodiment of the present invention; Figure 2 Schematic diagram of the oil circuit circulation in the high-efficiency internal circulation heat dissipation structure of the electronic oil pump in an embodiment of the present invention; Figure 3 A top view of the high-efficiency internal circulation heat dissipation structure of the electronic oil pump according to an embodiment of the present invention; Figure 4 for Figure 3 Cross-sectional view at AA in the middle; Figure 5 Schematic diagram of the structure of the end cover in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the motor housing in an embodiment of the present invention; Figure 7 Schematic diagram of the flow of a high-efficiency internal circulation heat dissipation control method for an electronic oil pump according to an embodiment of the present invention; Figure 8 Schematic diagram of the flow of oil flow rate control state in an embodiment of the present invention; Figure 9 Schematic diagram of the conventional temperature control process in an embodiment of the present invention; Figure 10 Schematic diagram of the structure of the emergency temperature control state in an embodiment of the present invention.

[0018] Figure markings: 01, first oil channel; 02, second oil channel; 03, third oil channel; 04, first oil return branch; 05, second oil return branch; 1, pump cover; 1a, oil inlet; 2, outer shell; 2a, first assembly space; 2b, second assembly space; 2c, third assembly space; 21, motor housing; 21a, second strip groove; 22, pump housing; 22a, first through hole groove; 22b, second through hole groove; 23, end cover; 23a, first strip groove; 3, controller; 4, center axis. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figures 1 to 6 The electronic oil pump high-efficiency internal circulation heat dissipation structure shown includes: The pump cover 1 is provided with an oil inlet 1a; the oil inlet 1a provides an entrance for the oil to enter the internal circulation system and is the initial channel of the entire oil circuit; The outer shell 2 is hollow inside, and the pump cover 1 is arranged at the opening of the shell; The controller 3 is equipped with several electronic components and is located at the closed end of the housing. The controller 3 is the control core of the electronic oil pump and is responsible for regulating the working state of the oil pump. The central shaft 4 is axially arranged in the housing, with both ends connected to form a first oil channel 01 of a hollow structure; the central shaft 4 is axially arranged to provide structural support, facilitating the assembly of the pump body and the stator assembly, rotor assembly and other components of the motor; Among them, the internal space of the outer shell 2 forms a first assembly space 2a for assembling the pump body, a second assembly space 2b for assembling the motor and a third assembly space 2c for assembling the controller 3 in sequence along the axial direction. One end of the first oil channel 01 is arranged opposite to the oil inlet 1a, and the other end is arranged opposite to the second assembly space 2b. The second oil channel 02 is formed at the connection between the second assembly space 2b and the third assembly space 2c, and the third oil channel 03 is formed between the inner side surface of the outer shell 2 and the outer diameter of the controller 3.

[0023] The present invention forms a first oil channel 01 through the central shaft 4 of the hollow structure, which can directly transport the oil to the second space for direct heat exchange with the motor, and then conducts sufficient oil contact with the controller 3 through the second oil channel 02 and the third oil channel 03, thereby realizing efficient heat dissipation of the motor and the controller 3; in this process, a complete internal circulation oil circuit is formed through the cooperation of the first oil channel 01, the second oil channel 02 and the third oil channel 03, thereby improving the oil circuit circulation in the electronic oil pump, significantly increasing the amount of oil flowing through the motor and controller 3 area, avoiding the occurrence of trapped air and causing local high temperature, and ensuring component performance and service life.

[0024] Specifically, the first oil channel 01 is composed of a hollow structure formed by the two ends of the central axis 4, which can directly guide the oil from the oil inlet 1a to the area where the motor is located, thereby increasing the contact amount between the motor and the oil; the second oil channel 02 is located at the connection between the second assembly space 2b and the third assembly space 2c, and is a transition channel for the oil to flow from the motor area to the controller 3 area, thereby realizing the orderly flow of oil between the motor and the controller 3; the third oil channel 03 is formed by the gap between the inner side surface of the outer shell 2 and the outer diameter of the controller 3, providing a path for the oil to flow through the outside of the controller 3, ensuring that the oil can fully wrap the controller 3 and realize comprehensive heat exchange with the controller 3. At the same time, the flow gap also avoids trapped air caused by oil retention.

[0025] The internal oil circulation circuit and heat dissipation process of the heat dissipation structure are as follows: the oil enters from the oil inlet 1a of the pump cover 1. Since one end of the first oil channel 01 is opposite to the oil inlet 1a, the oil flows into the shell through the first oil channel 01 and is introduced into the second assembly space 2b opposite to the other end, and fully contacts with the motor, absorbs the heat generated by the motor, and completes the initial heat dissipation of the motor; due to the setting of the hollow structure of the central shaft 4, the flow rate of the oil entering is greatly improved, and the oil that absorbs the heat of the motor enters the third assembly space 2c through the second oil channel 02 and contacts the motor. One side of the controller 3 is in contact with heat transfer; then, the oil flows along the third oil channel 03 into the space between the controller 3 and the closed end of the outer shell 2, and fully contacts and transfers heat to the other side of the controller 3, absorbing the heat generated by the operation of the controller 3; in this process, a part of the oil passes through the second oil channel 02 and directly returns to the initial oil inlet 1a through the return oil channel, and the other part of the oil passes through the third oil channel 03 to perform heat exchange on the other side of the controller 3 and then returns to the initial oil inlet 1a through the return oil channel, thereby establishing an oil circuit circulation while ensuring the heat dissipation of the internal circulation.

[0026] Based on the above embodiment, the outer shell 2 includes a motor housing 21, a pump housing 22 and an end cover 23. The motor housing 21 is open at both ends and provides a first assembly space 2a. The pump cover 1 is assembled at one open end of the motor housing 21. The pump housing 22 is disposed in the first assembly space 2a, and the flange surface cooperates with the pump cover 1. The end cover 23 is an open structure at one end and provides a third assembly space 2c. The open end of the end cover 23 is sealedly connected to the other open end of the motor housing 21, and the connection provides a second assembly space 2b.

[0027] The modular connection structure reduces the overall difficulty of production and assembly. Each component can be pre-processed and formed before assembly, which effectively reduces the overall assembly difficulty and improves production efficiency. During assembly, it is necessary to ensure the assembly sealing between the motor housing 21 and the end cover 23 to improve the precise positioning between the components, prevent oil leakage or poor oil circulation, and ensure the stability of the internal circulation oil circulation.

[0028] Among them, the pump housing 22 provides a mounting carrier for the pump body, and the matching connection between its flange surface and the pump cover 1 realizes the sealing of the pump body area, preventing oil from leaking from the connection of the motor housing 21, so as to ensure that the oil at the oil inlet 1a can be directed into the first oil channel 01.

[0029] Based on the above embodiment, the inner axial surface of the end cover 23 is provided with a plurality of first strip-shaped grooves 23a along the axial direction. The outer axial surface of the controller 3 is arranged in contact with the inner axial surface of the end cover 23. The first strip-shaped grooves 23a form the third oil channel 03.

[0030] Specifically, several first strip-shaped grooves 23a provide a flow path for the oil to enter the third assembly space 2c from the second assembly space 2b, while ensuring the assembly stability between the controller 3 and the end cover 23, providing a guiding effect for the oil flow path, and the flow cross-sectional area is stable, avoiding the dispersed flow of the oil, so that the oil can stably enter between the controller 3 and the end face of the end cover 23 through the third oil channel 03 formed by the first strip-shaped grooves 23a, ensuring the stability of the heat dissipation effect.

[0031] On the basis of the above embodiment, a plurality of second strip-shaped grooves 21a are provided on the inner axial surface of the motor housing 21 along the axial direction, the outer axial surface of the pump housing 22 is arranged in abutment with the inner axial surface of the motor housing 21, and a first through-hole groove 22a is provided on the flange surface, and the second strip-shaped groove 21a is spaced apart from the outer surface of the pump housing 22 and is connected with the first through-hole groove 22a to form a first oil return branch 04.

[0032] The first oil return branch 04 allows the oil in the outer shell 2 to quickly return after absorbing heat from different areas, reducing the accumulation of high-temperature oil between different areas and avoiding local overheating. At the same time, the flowing return oil can take away the residual heat from the motor area for a second time, further improving the heat dissipation effect; specifically, through the cooperation between the second strip groove 21a and the first through-hole groove 22a, a channel for oil to pass through is formed between the outer axial surface of the pump shell 22 and the inner axial surface of the motor shell 21, ensuring the stability of the oil return path, and the oil can flow in a direction through the second strip groove 21a for stable oil return.

[0033] Based on the above embodiment, a second through hole groove 22b is opened on the end surface of the pump housing 22 located in the first assembly space 2a. The second through hole groove 22b is connected with the first assembly space 2a and the second assembly space 2b to form a second oil return branch 05.

[0034] A dual-path oil return effect is formed between the second oil return branch 05 and the first oil return branch 04, so that part of the oil can flow back from the second assembly space 2b to the first assembly area, further taking away the heat from the pump body area, reducing the risk of local overheating, and improving the oil circuit circulation efficiency. At the same time, the design of the dual oil return branch can disperse the pressure during oil return, avoid excessive pressure in a single oil return path due to flow concentration, reduce the stress load on oil circuit components such as the connection between the motor housing 21 and the pump housing 22, and reduce the risk of leakage; it should be noted that the aperture, position and number of the second through hole groove 22b can be designed according to the oil return requirements, so that the second oil return branch 05 can cooperate with the first oil return branch 04 to adjust the total oil return volume to ensure the balance of the oil circuit circulation.

[0035] Based on the above embodiment, the electronic component includes a first temperature monitoring element and a second temperature monitoring element. The first temperature sensing element is used to monitor the temperature data of the first assembly space 2a in real time, and the second temperature monitoring element is used to sense the temperature data of the third assembly space 2c in real time.

[0036] Specifically, the first assembly space 2a is the spatial area where the oil is initially input and the oil finally flows back. The temperature data of the first assembly space 2a collected in real time can reflect the heat generation of the pump body and the motor when they are working. Based on this, the heat generation of the core working area of ​​the electronic oil pump can be accurately judged and monitored; the third assembly space 2c is the assembly area of ​​the controller 3 and the heat exchange area between the oil and the controller 3. The temperature data of the third assembly space 2c collected in real time can reflect the heat generation of the controller 3 when it is working and determine whether local heat accumulation occurs; by comprehensively considering the temperature data of different areas, the operating speed of the electronic oil pump can be dynamically adjusted, the oil circulation flow rate can be optimized, the zoned heat dissipation effect can be realized on demand, the heat exchange efficiency can be improved, and the alarm signal or protective shutdown can be triggered in time when an abnormal situation is found to avoid the expansion of the fault, extend the overall service life of the oil pump, and enhance the safety of equipment operation.

[0037] like Figures 7 to 10 As shown, the present invention also provides a method for controlling high-efficiency internal circulation heat dissipation of an electronic oil pump, using any of the above high-efficiency internal circulation heat dissipation structures of the electronic oil pump, comprising the following steps: The oil enters the first oil channel 01 from the oil inlet 1a, and the first oil channel 01 guides the oil into the second assembly space 2b. During this process, the oil enters the second assembly space 2b and fully contacts the motor, absorbing the heat generated by the motor, completing the initial heat dissipation of the motor and preventing the motor from performance degradation due to high temperature. The oil in the second assembly space 2b contacts one side of the controller 3 through the second oil channel 02, transfers heat, and then enters the third assembly space 2c. During this process, the oil contacts one side of the controller 3 and absorbs heat generated by the operation of the electronic components of the controller 3 from one side. The oil in the third assembly space 2c passes through the third oil channel 03 and enters between the controller 3 and the closed end of the outer shell 2, and contacts and transfers heat to the other side of the controller 3. During this process, the oil enters between the controller 3 and the closed end of the outer shell 2, so that the controller 3 can be completely immersed in the oil. The flow of the oil removes the heat from the controller 3, avoiding high temperatures in local areas of the controller 3 due to uneven heat dissipation, thereby ensuring the stability of the operation of the controller 3. The oil flows from the third oil channel 03 or the second oil channel 02 through the return oil channels in the second assembly space 2b and the first assembly space 2a in sequence and returns to the oil inlet 1a, establishing an oil circuit circulation; specifically, the returned oil includes two parts, one part directly returns to the oil inlet 1a from the second oil channel 02 through the return oil channel, and the other part of the oil passes through the third oil channel 03 into the third assembly space 2c, and then returns to the oil inlet 1a through the return oil channel; the return oil channel can also be set to a dual-path reflux structure including the first return oil branch 04 and the second return oil branch 05, so that the oil forms a complete closed loop of "oil inlet-motor heat dissipation-controller heat dissipation-oil return", ensuring uninterrupted oil circulation and continuous removal of heat.

[0038] Based on the above embodiment, the following steps are also included: During oil circulation, the first temperature in the first assembly space 2a and the second temperature in the third assembly space 2c are collected and monitored in real time. Specifically, the first and second temperatures respectively reflect the heating status of different core working areas, providing a basis for subsequent adjustments. A hierarchical adjustment logic based on the temperature operating threshold range can be formed, and the oil flow rate status is dynamically adjusted based on the comparison results between the two. When the first temperature and the second temperature are within the normal operating threshold range, the oil flow rate is controlled to be in an operating state. During this process, the first temperature and the second temperature are both within the normal operating threshold range, the oil flow rate is maintained at a preset normal operating value, and the oil circuit can circulate stably along a basic path, so that when the heat dissipation demand is low, the normal operating cycle is maintained with minimum energy consumption, and the relationship between heat dissipation effect and work efficiency is balanced; When the first temperature or the second temperature exceeds the normal operating threshold range, the oil flow rate is controlled to a normal temperature control state. During this process, if the pump body area or the controller 3 area overheats, the total oil flow rate can be increased by appropriately increasing the motor speed. In combination with the oil distribution between the first oil channel 01, the second oil channel 02, and the third oil channel 03, precise and enhanced heat dissipation is formed for the local overheating area, preventing the high temperature of a single area from spreading to other components, and at the same time avoiding a surge in energy consumption caused by high flow rate in the entire area. When both the first temperature and the second temperature exceed the normal operating threshold range, the oil flow rate is controlled to be in an emergency temperature control state; during this process, the motor is in a dangerous working state, and appropriate emergency measures should be taken to achieve rapid heat dissipation to avoid motor burning or controller 3 failure due to continuous high temperature.

[0039] In addition, when the monitored temperature data returns to the normal working threshold range, the two different temperature control states are released. The staff can switch the oil supply state according to the actual situation and gradually restore the oil supply to the normal working state, allowing the electronic oil pump to enter the normal working mode again.

[0040] The above method can make targeted adjustments to the oil flow distribution through temperature feedback in the case of local overheating and overall overheating, thereby achieving the effect of on-demand heat dissipation, improving heat dissipation efficiency while reducing unnecessary heat dissipation energy consumption. In addition, multiple temperature control state modes provide buffer protection for the equipment it is installed on, thereby improving the overall reliability and safety of the electronic oil pump.

[0041] Based on the above embodiment, controlling the oil flow rate to be in a conventional temperature control state includes the following steps: Increasing the oil flow rate to increase the number of oil circuit cycles per unit time, thereby reducing the first temperature or the second temperature to within the normal operating threshold range. In this process, the appropriate increase in the oil flow rate can increase the contact flow rate of the oil with the components in the heat-generating area per unit time, thereby accelerating the efficiency of heat transfer by increasing the oil volume and quickly reducing the temperature in the area exceeding the normal operating threshold range. Determine the temperature difference between the first and second temperatures to determine whether it is within a controllable threshold. The temperature difference can reflect the degree of heat imbalance between the two areas. If the temperature difference is too large, it means that a single area is overheating and has affected the system balance, requiring upgraded control. If the temperature difference is small, local heat dissipation can be optimized by oil distribution, that is: When the temperature difference exceeds the controllable threshold, the oil flow rate is controlled to enter an emergency temperature control state. During this process, it is determined that the current local overheating is approaching the risk of system imbalance. The high temperature in a single area may affect the structure of other components through heat conduction, resulting in heat dissipation failure. Therefore, upgraded control is required to prevent the local overheating from spreading to an overall failure. When the temperature difference is within the controllable threshold range, a dynamic connection is established between the temperature difference and the oil volume ratio between the oil entering the return oil channel from the second oil channel 02 and the oil entering the return oil channel from the third oil channel 03, and the synchronous oil distribution mode is entered; in the oil circuit circulation process, two return oil paths are formed, one of which is that the oil flows directly back from the second oil channel 02 to the second assembly space 2b and the first assembly space 2a. In this path, the oil return will further take away the heat from the motor and pump body area, focusing on the heat dissipation of the motor and pump body components. The other path is that the oil passes through the third oil channel 03 and then enters the second assembly space 2b and the first assembly space 2a. Into the reflux channel, in this path the oil mainly dissipates heat to the controller 3 area; its dynamic distribution depends on the temperature difference between the first temperature zone and the second temperature zone, and the heat dissipation between the two is determined by the size of the temperature difference. For example, when the temperature of the first assembly area is significantly higher than that of the third assembly area, the proportion of direct oil reflux can be appropriately increased to enhance the heat dissipation effect on the pump body and motor area; when the temperature of the third assembly area is significantly higher than that of the first assembly area, the proportion of direct oil reflux can be appropriately reduced to allow more oil to enter the third oil channel 03 to enhance the contact heat dissipation of the controller 3.

[0042] Based on the above embodiment, controlling the oil flow rate to be in an emergency temperature control state includes the following steps: The oil flow rate is adjusted to automatically enter low-power operation mode, and the temperature gradient between the first and second temperatures is determined in real time. This means that oil supply should prioritize heat dissipation, reducing the actual output power of the electronic oil pump. While reducing heat generation, a high flow rate is maintained to ensure that the oil continues to remove existing heat, avoiding a vicious cycle of simultaneous surges in heat dissipation and heat generation. The temperature gradient is the amount of temperature change per unit time. For example, the average rate of change within ten seconds can be used to comprehensively reflect and judge the current temperature change trend. When the temperature change gradient is a positive transformation, or the temperature change gradient is a negative transformation and exceeds the warning threshold range, an alarm is issued and an emergency braking operation is performed; among them, the positive transformation means that the temperature change gradient is a positive value, that is, the temperature is still on an upward trend after switching the operating mode. Similarly, the reverse transformation means that the temperature change gradient is a negative value, that is, the temperature change gradient is on a downward trend. However, if the temperature change gradient exceeds the warning threshold range, it means that the temperature is cooling too fast or too slow, which is prone to component thermal shock or heat dissipation failure. Under the current measures, the temperature imbalance phenomenon cannot be effectively curbed, and emergency braking operations need to be taken, such as lighting the fault light through the vehicle system, sounding a buzzer prompt, cutting off the motor power supply, stopping the oil pump operation, etc., to protect the safety of the electronic oil pump and equipment; When the temperature change gradient is reversely transformed and the temperature change gradient value is within the warning threshold range, a dynamic connection is established between the temperature change gradient and the oil volume ratio between the oil entering the return oil channel from the second oil channel 02 and the oil entering the return oil channel from the third oil channel 03, and the low-power return oil distribution mode is entered; when the temperature change gradient is in the current state, it means that the measures at this time have a certain cooling effect, and the cooling effect can be further optimized by reasonably allocating the return oil volume of different paths; for example: when the temperature change gradient of the first temperature is smaller than the temperature change gradient of the second temperature, the proportion of direct oil reflux can be appropriately increased, and the oil return flow rate can be increased. Speed ​​up the cooling rate of the pump body and motor area; when the temperature change gradient of the first temperature is greater than the temperature change gradient of the second temperature, the proportion of direct oil reflux can be appropriately reduced, so that more oil can enter the third oil channel 03, prolong the residence time of the oil in the third oil channel 03, and enhance the heat dissipation rate of the controller 3; by utilizing the gradient difference to quantify the cooling efficiency gap between the two areas, the area with slower cooling is replenished with oil in a targeted manner, and the overall cooling speed is maximized under the limitation of low-power operation, achieving dual-area synchronous cooling, avoiding secondary overheating caused by cooling lag in a single area, and improving the reliability of the electronic oil pump operation.

[0043] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic oil pump high-efficiency internal circulation heat dissipation structure, characterized in that: include: A pump cover is provided with an oil inlet; The outer shell is hollow inside, and the pump cover is arranged at the opening of the shell; a controller, equipped with a plurality of electronic components, disposed at the closed end of the housing; A central shaft is axially arranged in the housing, with both ends penetrating to form a first oil channel of a hollow structure; In which, the internal space of the outer shell forms a first assembly space for assembling the pump body, a second assembly space for assembling the motor and a third assembly space for assembling the controller in sequence along the axial direction, one end of the first oil channel is arranged opposite to the oil inlet, and the other end is arranged opposite to the second assembly space, a second oil channel is formed at the connection between the second assembly space and the third assembly space, and a third oil channel is formed between the inner side surface of the outer shell and the outer diameter of the controller.

2. The electronic oil pump high-efficiency internal circulation heat dissipation structure according to claim 1 is characterized in that: The outer shell includes a motor housing, a pump housing and an end cover. The motor housing is a structure with two open ends and provides the first assembly space. The pump cover is assembled at one open end of the motor housing. The pump housing is arranged in the first assembly space, and the flange surface cooperates with the pump cover. The end cover is a structure with one end open and provides the third assembly space. The open end of the end cover is sealed and connected to the other open end of the motor housing, and the second assembly space is provided at the connection.

3. The electronic oil pump high-efficiency internal circulation heat dissipation structure according to claim 2 is characterized in that: The inner axial surface of the end cover is provided with a plurality of first strip-shaped grooves along the axial direction. The outer axial surface of the controller is arranged in contact with the inner axial surface of the end cover. The first strip-shaped grooves form the second oil channel.

4. The electronic oil pump high-efficiency internal circulation heat dissipation structure according to claim 2 is characterized in that: The inner axial surface of the motor housing is provided with a plurality of second strip-shaped grooves along the axial direction, the outer axial surface of the pump housing is arranged in abutment with the inner axial surface of the motor housing, and a first through-hole groove is provided on the flange surface, the second strip-shaped groove is spaced apart from the outer surface of the pump housing, and is connected with the first through-hole groove to form a first oil return branch.

5. The electronic oil pump high-efficiency internal circulation heat dissipation structure according to claim 4 is characterized in that: A second through hole groove is formed on the end surface of the pump housing located in the first assembly space. The second through hole groove is communicated with the first assembly space and the second assembly space to form a second oil return branch path.

6. The electronic oil pump high-efficiency internal circulation heat dissipation structure according to claim 1 is characterized in that: The electronic component includes a first temperature monitoring element and a second temperature monitoring element. The first temperature sensing element is used to monitor the temperature data of the first assembly space in real time, and the second temperature monitoring element is used to sense the temperature data of the third assembly space in real time.

7. A method for controlling high-efficiency internal circulation heat dissipation of an electronic oil pump, using the high-efficiency internal circulation heat dissipation structure of an electronic oil pump according to any one of claims 1 to 6, characterized in that: The following steps are involved: The oil enters the first oil channel from the oil inlet, and the first oil channel guides the oil into the second assembly space; The oil in the second assembly space contacts and transfers heat with one side of the controller when passing through the second oil channel, and is then merged into the third assembly space; The oil in the third assembly space enters between the controller and the closed end of the outer shell through the third oil channel, and contacts and transfers heat to the other side of the controller; The oil returns to the oil inlet from the third oil channel or the second oil channel through the oil return channels in the second assembly space and the first assembly space in sequence, thus establishing an oil circuit circulation.

8. The electronic oil pump high-efficiency internal circulation heat dissipation control method according to claim 6, characterized in that: The following steps are also included: When the oil circuit circulates, collecting and monitoring in real time a first temperature in the first assembly space and a second temperature in the third assembly space; When the first temperature and the second temperature are within a normal operating threshold range, the oil flow rate is controlled to be in a working state; When the first temperature or the second temperature exceeds the normal operating threshold range, controlling the oil flow rate to be in a normal temperature control state; When both the first temperature and the second temperature exceed the normal operating threshold range, the oil flow rate is controlled to be in an emergency temperature control state.

9. The electronic oil pump high-efficiency internal circulation heat dissipation control method according to claim 8, characterized in that: The control of the oil flow rate in a conventional temperature control state comprises the following steps: Increasing the oil flow rate to increase the number of oil circuit cycles per unit time, so that the first temperature or the second temperature is reduced to within the normal operating threshold range; determining a temperature difference between the first temperature and the second temperature, and determining whether the temperature difference is within a controllable threshold range; When the temperature difference exceeds the controllable threshold range, the oil flow rate is controlled to enter an emergency temperature control state; When the temperature difference is within the controllable threshold range, a dynamic connection is established between the temperature difference and the oil volume ratio between the oil entering the return oil channel from the second oil channel and the oil entering the return oil channel from the third oil channel, and the synchronous oil distribution mode is entered.

10. The electronic oil pump high-efficiency internal circulation heat dissipation control method according to claim 8, characterized in that: The control of the oil flow rate in the emergency temperature control state includes the following steps: adjusting the oil flow rate to automatically enter a low-power operation mode, and determining in real time a temperature change gradient between the first temperature and the second temperature; When the temperature change gradient is a positive transformation, or the temperature change gradient is a negative transformation and exceeds the warning threshold range, an alarm is issued and an emergency braking operation is performed; When the temperature change gradient is reversely transformed and the temperature change gradient value is within the warning threshold range, a dynamic connection is established between the temperature change gradient and the oil volume ratio between the oil entering the return oil channel from the second oil channel and the oil entering the return oil channel from the third oil channel, and the low-power return oil distribution mode is entered.

Images