Electric pump system and method

Abstract

To provide methods and structures that help manage the transfer of heat and assessment of fluid temperature in electric pump systems.SOLUTION: An electric pump system and a method of operating the same involve pumping a fluid through a fluid passageway 1114 defined in a mechanical pump 202 from a pump inlet 1116 to a hollow shaft 706 of a motor 204, through the hollow shaft to an internal motor cavity 1108 defined by a housing 404 of the motor, and through another fluid passageway 1126 defined in the motor housing and mechanical pump that leads to a pump outlet 208. The system and method further involve pumping the fluid through another fluid passageway defined in the mechanical pump from yet another pump inlet 1124 to the pump outlet. The temperature of fluid exiting the hollow shaft can be assessed and used by an electronic control unit (ECU) 206 of the electric pump system to control the same.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This PCT application is a joint venture with ELECTRIC PUMP S U.S. Utility Patent Application No. 15 / 944,84, entitled "SYSTEM AND METHOD" No. 1 and the "ELECTRIC PUMP SYSTEM" filed on June 30, 2017 No. 62 / 527,699, entitled "METHOD AND METHOD FOR USE IN A HIGH-TEMPERATURE SYSTEM ... Priority is claimed on the application filed on April 4, 2018, entitled "ELECTRIC PUMP U.S. Utility Patent Application No. 15 / 944, entitled "SYSTEM AND METHOD," No. 841 is a patent application filed on June 30, 2017 entitled "ELECTRIC PUMP SYS No. 62 / 527,699, entitled "TEM AND METHOD" 119(e) to the same application, both of which claim priority pursuant to 35 U.S.C. No. 6,393,945, filed on Oct. 13, 2003, which is incorporated herein by reference in its entirety and forms part of this PCT application for all purposes. vinegar.

[0002] This PCT application is a joint application of the International Patent Application Serial No. 2017 / 01 / 02 filed on June 29, 2017 entitled "SYSTEM AND METHODS". HOD FOR MONITORING STRESS CYCLES” in the U.S. No. 15 / 637,313, which is incorporated by reference in its entirety.

[0003] The present invention relates to an electric pump system, and more particularly to a vehicle drive system. This relates to the assessment of heat transfer and fluid temperature in electric pump systems such as those used. [Background technology]

[0004] For example, the electric pump system in the drive system of an electric vehicle is In particular, the bearings, rotors and stators of traction motors are cooled and lubricated. Such an electric pump system can be used to supply oil to Typically, a mechanical pump, an electric motor and an electronics to control the electric pump system Includes equipment. Summary of the Invention [Problem to be solved by the invention]

[0005] The challenge associated with designing such an electric pump system is to develop a pump with the desired flow characteristics. This includes the design of the pump system. Conventional oil pumps do not monitor the condition of the oil and therefore Since the condition of the oil, pump, and motor cannot be checked separately, the oil must be replaced regularly. A further by-product is that any temperature sensors in the conventional pump system Partially because it is located either on the outside or in the area that represents the oil flowing through the pump. Conventional oil pumps are not designed to accurately determine temperature (and cannot accurately determine it). In addition, conventional oil pumps often , large and cumbersome due to the mounting mechanisms of the different parts, and larger physical space for the pump space. Therefore, an improved There is a need for improved oil pumps, particularly electric pump systems. [Means for solving the problem]

[0006] The present disclosure provides a method for eliminating the difficulties of operating a cooling and lubrication system, particularly for an electric power plant. Methods and structures useful for managing heat transfer and fluid temperature assessment in pump systems - Patents.com Provide a structure.

[0007] According to one aspect of the present disclosure, an electronic control unit, a mechanical pump, and a first and second and a motor having a stator and a hollow shaft. The motor includes a rotor and a housing around the stator and the rotor. An electronic control unit controls the motor. a hollow shaft motor connected to a first side of the motor and a mechanical pump connected to a second side of the motor; The shaft defines a shaft inlet and a shaft outlet, and the mechanical pump is adapted to pump air from the first pump inlet. a first fluid passageway from the first motor to the shaft inlet; and a housing defining an internal motor cavity; The shaft outlet is in fluid communication with the internal motor cavity, and the mechanical pump is connected to the second pump inlet. the motor housing and the mechanical pump defining a third fluid passageway to the pump outlet; a third fluid passageway from the internal motor cavity to the pump outlet via the pump inlet; Placement is provided.

[0008] In some embodiments of the apparatus according to the above aspect of the present disclosure or any other aspect thereof, A number of optional operations and features may be employed. One optional feature is electronic The control unit may further include a thermistor for measuring the temperature of the fluid exiting the shaft outlet. Another optional feature is that the housing has a bypass in fluid communication with the internal motor cavity. Another optional feature is that the second fluid passage and the third fluid passage define an inlet. Another optional feature is that the mechanical pump has at least a portion of the passageway in common. Another optional feature is that the electronic control unit is a mechanical Another optional feature is that it includes a microcontroller that controls the pump. The child control unit includes cooling ribs.

[0009] According to one aspect of the present disclosure, there is provided a method of pumping fluid in an electric pump system, comprising: A first fluid passageway from the first pump inlet to the shaft inlet, and a second fluid passageway from the shaft inlet to the shaft inlet. an electric pump in fluid communication with the shaft outlet through a hollow shaft of the motor; A second pump inlet of the mechanical pump is connected to the inner motor cavity of the pump system. from the internal motor cavity through a third pump inlet, through a second fluid passageway to the pump outlet; A pump outlet is provided on the motor housing of the electric pump system and on the mechanical pump. A method is provided that includes pumping the fluid through a third fluid passageway.

[0010] In some embodiments of the method according to the above aspect of the present disclosure or any other aspect thereof, A number of optional operations and features may be employed. One optional feature is a hollow Another optional feature is to measure the temperature of the fluid exiting the motor shaft. and supplying fluid to the internal motor cavity through a bypass inlet defined in the housing. Another optional feature is to include pumping of fluid from a bypass inlet to the internal motor cavity. Another optional feature is that the mechanical pump includes a gerotor. The feature is that the mechanical pump is controlled by an electronic control unit that contains a microcontroller. And so.

[0011] According to one aspect of the present disclosure, a mechanical pump, an electronic control unit, and a first and second In a system including an apparatus including a motor having a stator and a hollow A rotor including a shaft, a housing around the stator and the rotor, and an electronic control The unit is connected to a first side of the motor and a mechanical pump is connected to a second side of the motor. the hollow shaft defines a shaft inlet and a shaft outlet, and the mechanical pump includes a first a housing defining a first fluid passage from the pump inlet to the shaft inlet of the internal motor; a shaft outlet in fluid communication with the internal motor cavity; and a mechanical pump in fluid communication with the second motor cavity. A second fluid passage is defined from the pump inlet to the pump outlet, the motor housing and the mechanical the pump has a third fluid passage from the inner motor cavity through a third pump inlet to a pump outlet. a heat exchanger in fluid communication with the pump outlet and an oil reservoir in fluid communication with the first pump inlet; and in fluid communication with the second pump inlet.

[0012] In some embodiments of the method according to the above aspect of the present disclosure or any other aspect thereof, A number of optional operations and features may be employed. One optional feature is electronic The control unit may further include a thermistor for measuring the temperature of the fluid exiting the shaft outlet. Another optional feature is that the housing has a bypass in fluid communication with the internal motor cavity. Another optional feature is that the second fluid passage and the third fluid passage define an inlet. Another optional feature is that the mechanical pump has at least a portion of the passageway in common. Another optional feature is that the electronic control unit is a mechanical Another optional feature is that it includes a microcontroller that controls the pump. The child control unit includes cooling ribs. [Brief description of the drawings]

[0013] [Figure 1] 1 shows the basic components of a cooling and lubrication system in an electric vehicle.

[0014] [Figure 2A] 1 illustrates a front perspective view of an electric pump system according to a disclosed embodiment. [Figure 2B] FIG. 1 illustrates a rear perspective view of an electric pump system according to a disclosed embodiment.

[0015] [Figure 3A] FIG. 2 illustrates a rear view of an electric pump system according to a disclosed embodiment. [Figure 3B] 3B shows a side cross-sectional view of an electric pump system according to disclosed embodiments taken along section line AA of FIG. 3A.

[0016] [Figure 4A] 1 illustrates a cross-sectional side view of an electric pump system according to a disclosed embodiment, particularly illustrating the mounting of components of the electric pump system. [Figure 4B] 1 illustrates a perspective view of an electric pump system according to a disclosed embodiment, particularly illustrating the installation of the components of the electric pump system.

[0017] [Diagram 5] 1 illustrates a partial cross-sectional side view of an electric pump system according to a disclosed embodiment, particularly showing a seal of the electric pump system.

[0018] [Figure 6A] FIG. 1 illustrates a front view of a gerotor used in an electric pump system according to disclosed embodiments. [Figure 6B] FIG. 1 illustrates a side view of a gerotor used in an electric pump system according to disclosed embodiments.

[0019] [Figure 7A] FIG. 1 illustrates an end view of an electric motor used in an electric pump system according to disclosed embodiments. [Figure 7B] 7B shows a cross-sectional side view of an electric motor used in an electric pump system according to disclosed embodiments taken along section line BB of FIG. 7A.

[0020] [Figure 8] 1 illustrates a partial cross-sectional side view of an electric pump system, particularly showing a shaft used in the electric pump system according to disclosed embodiments.

[0021] [Figure 9A] 1 illustrates a rear view of an electronic control unit (ECU) used in an electric pump system according to disclosed embodiments. [Figure 9B] FIG. 1 illustrates a side view of an electronic control unit (ECU) used in an electric pump system according to disclosed embodiments. [Figure 9C] 9B shows a cross-sectional side view of an electronic control unit (ECU) used in an electric pump system according to disclosed embodiments taken along section line CC of FIG. 9A.

[0022] [Figure 10A] FIG. 2 illustrates an ECU end view of the ECU electronics according to the disclosed embodiments. [Figure 10B] FIG. 2 illustrates a side view of ECU electronics according to disclosed embodiments. [Figure 10C] FIG. 2 illustrates a motor-side end view of the ECU electronics according to the disclosed embodiments.

[0023] [Figure 11] 1 illustrates a cross-sectional side view of an electric pump system according to a disclosed embodiment.

[0024] [Figure 12]1 illustrates a cross-sectional side view of an electric pump system according to a disclosed embodiment, particularly showing a first fluid flow path.

[0025] [Figure 13] 1 illustrates a cross-sectional side view of an electric pump system according to a disclosed embodiment, particularly showing the second fluid flow path.

[0026] [Figure 14] 1 illustrates a cross-sectional side view of an electric pump system according to a disclosed embodiment, particularly showing the third fluid flow path.

[0027] [Figure 15] FIG. 15 shows a cross-sectional end view of the electric pump system of FIGS. 11 to 14.

[0028] [Figure 16] FIG. 4 is a flow diagram illustrating the operation of the electric pump system according to the disclosed embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] FIG. 1 shows the various components of an electric drive unit of an electric vehicle, e.g. The cooling and lubrication systems according to the disclosed embodiments are used to circulate fluids such as oil. 1 shows a schematic diagram of a system 100. The following description of the other figures refers to the components of FIG. Components that may relate back to each other and are identified in those figures using a common numbering. Additionally, the embodiments described herein may refer to oil-based In the context of the system, other fluids may be used. For example, Any fluid that provides adequate lubrication, heat transfer, and flow characteristics for the pump size may be used. This is also fine.

[0030] Includes sump or dry sump systems (oil reservoir external to the drive unit) It starts with an oil reservoir 102 that can hold oil, and the oil passes through a mesh filter 104. The oil flows through the electric pump system 106. The oil passes through an oil filter 108 and a heat exchanger 110 and is then fed to a motor 112. The power is split between the first branch and another branch that leads to the gearbox 114. The oil flows back to the oil reservoir 102.

[0031] Various operational issues with the cooling and lubrication system 100 are addressed in various implementations herein. One operational issue is the heat exchange within the electric pump system 106. Another operational issue is the assessment of the temperature of the oil in the cooling and lubrication system 100. The oil temperature is related to the heat transfer in the heat exchanger 110, i.e., the vehicle It can be controlled by the heat exchange between the coolant and the oil. Firmware or The software is typically implemented in an engine control unit (ECU) and Controls the electric pump system 106.

[0032] 2A and 2B are diagrams illustrating an electric pump system 1 according to a disclosed embodiment. 2A shows a front perspective view and a rear perspective view of mechanical pump 202. , electric motor 204 and electronic control unit (ECU) 206. The pump outlet 208, the ECU housing 210 having an integrated design, and the electric pump system 106 to connect the mechanical pump 202 to the electric motor 204 (particularly the motor housing). Also shown are pump bolts 212 for connecting the pump to the pump. These elements are described in more detail below. FIG. 2B also shows a mechanical pump 202, an electric motor 204, and an ECU 206. The ECU 206 is shown having cooling ribs 214, of which only one is shown in FIG. 2B. Only one is so labeled and is described in more detail below. A bypass inlet 216 is also shown.

[0033] 3A and 3B are diagrams illustrating an electric pump system 1 according to a disclosed embodiment. 3A and a cross-sectional side view taken along line AA of FIG. 3A. The figure shows the ECU 206 with cooling ribs 214. The side cross-sectional view of FIG. A pump 202, an electric motor 204, and an ECU 206 are shown.

[0034] 4A and 4B are diagrams illustrating an electric pump system according to a disclosed embodiment; Side sectional and perspective views are shown, particularly illustrating the installation of the components of the electric pump system. As shown in FIG. 4A, the ECU 206 is attached to the motor house using a clip 406. The clip is attached to the housing 404. Only one such clip is shown in FIG. 4A. However, multiple clips can be used as shown in FIG. 4B. The motor housing 404 includes an alignment feature 408 and a pump bolt 21. 2 is further attached to the pump housing 402 using one pump bolt 21 Although only two are shown, the electric pump system may include multiple such pump bolts. As shown therein, the pump bolt 212 has a head that is inserted into the internal motor cavity. Such an arrangement is advantageous in that the oil pump is disposed within the motor housing 404 so that the This reduces the size of the amplifier package, which in turn allows for higher performance (i.e., Optimized electric pump system with better efficiency and higher flow The motor housing 404 and the pump housing 402 are cast metal. As mentioned above, FIG. 4B shows a motor housing 404 connected to the ECU 206. Specifically, the electric pump system 106 is shown having a plurality of clips 406 attached thereto. The clips 40 are positioned around the motor housing 404 so that they can be visually seen from the outside. 6 is shown. There are sufficient clips to connect the ECU 206 to the motor housing 404. In some cases, no bolts are required.

[0035] FIG. 5 illustrates a side cross-sectional view of an electric pump system according to a disclosed embodiment, and in particular, As shown in FIG. 5, the electric pump system 106 includes a seal for the pump system. , and are sealed using radial O-rings 502 , 504 , 506 and 508 . O-ring 502 is an inner O-ring for sealing ECU 206. 4 provides a seal against the surroundings. O-rings 506 and 508 are The pressurized outlets of the system are located on either side of the pressurized outlets, which are described in more detail below.

[0036] 6A and 6B each show a jet that may be part of the mechanical pump 202. 6A shows a front view and a side view of rotor 600. As shown in FIG. 0 has six teeth, one of which is designated by reference number 602, and one of which is The disclosed embodiment (see FIG. 6B) has seven cavities, each of which is indicated by reference numeral 604. According to the illustrated embodiment, gerotor 600 has an outer diameter 606 that is greater than its width 608, but is not limited to a particular geometry. The rotor is provided as an example and the mechanical pump 202 is not so limited. Any mechanical positive displacement pump configuration or gerotor with different tooth counts, displacements, etc. can be used without It can include.

[0037] 7A and 7B are diagrams illustrating an electric pump system according to a disclosed embodiment. 7B. As shown in FIGS. 7A and 7B, the electric motor 204 is one of 7 includes a stator winding labeled by reference numeral 702 and a rotor 704 . The rotor 704 has a hollow shaft 706 which allows oil to flow through the shaft. In other embodiments, the rotor 704 includes a solid shaft and the oil is pumped through other paths. 1. The motor cavity may be connected to the

[0038] FIG. 8 illustrates a partial side cross-sectional view of an electric pump system, particularly in accordance with the disclosed embodiments. As shown therein, the hollow shaft 7 06 extends into the mechanical pump 202 via the rotor 704 of the electric motor 204 . According to one embodiment, the rotor 704 is press fit into the hollow shaft 706. 706 is supported by two plain bearings 808 and 810, which in this example are The gap between them is tightly optimized for the selected lubricant and operating point. Two alternating side-by-sides with very high surface quality and low tolerances as controlled This includes the contact surfaces.

[0039] 9A, 9B, and 9C are diagrams illustrating an electric pump system according to a disclosed embodiment. FIG. 9A shows a rear view, a side view, and a cutaway view of the ECU 206 used in the system. The cooling ribs 214 are attached to the ECU cover 902 (or a part thereof). The cooling ribs 214 are attached to the ECU cover 902. It provides a thermal interface that dissipates heat to the surroundings. A capacitor and one or more transistors (such as MOSFETs) labeled 906 The ECU is shown with a microchip 908. The ECU controls the temperature, pump speed, Information such as current composition, oil pressure, and other information can be obtained. The information obtained by the U monitors the health of the oil pump and the overall drive unit. The algorithm can be used to monitor the oil change. Provides service indications, such as when the engine needs replacing or when the driveline needs repair. It can be provided.

[0040] 10A, 10B, and 10C are diagrams illustrating ECs according to disclosed embodiments. The ECU side end view, side view, and motor side end view of the U electronic device are shown in FIG. 10A. As shown, from the ECU side, the ECU electronics 1000 includes a printed circuit board (PCB) 1 The electrical components are labeled 002 and one of which is labeled 1004. , a processor or microphone to execute the firmware and / or software. controller, communication transceiver, current sensing component, motor control unit, gate drive One of the drivers may contain a capacitor labeled 1008. Other electronic components include the thermistors for measuring the temperature of the PCB1002 and electrical components. 1010, the temperature of which can be measured using a "printed circuit board assembly" (PCBA) The side view of FIG. 10B shows the mounting legs 1 supporting the PCB 1002. 10C, from the motor side, the ECU electronics 1000 , a pump system, a motor control integrated circuit 1014 and an oil temperature thermistor 1016 A processor or microcontroller 1012 may be included for controlling the The CU electronics 1000 includes a bootloader software for the purpose of loading software updates. The device may further include software.

[0041] FIG. 11 illustrates a side cross-sectional view of an electric pump system according to a disclosed embodiment. As shown therein, the electric motor 204 (which may also be referred to as the first side) 1102 and a pump side (which may also be referred to as the second side) 1104. Connected to the ECU side 1102 is the ECU 206, and connected to the pump side 1104 is the ECU 206. Connected to the rotor 704 is a mechanical pump 202. Also connected to the rotor 704 is a stator 11. Also shown is a motor housing 404 disposed around the motor housing 406, thereby Fluid flows through the housing 404 and through the rotor 704 and the stator 1106. The rotor 704 includes a hollow shaft 706. The rotor 704 defines an internal motor cavity 1108 through which the rotor 704 can be driven. , the stator 1106 includes end windings 702. The hollow shaft 706 is 110 and defines a shaft outlet 1112 .

[0042] As shown in FIG. 11, the mechanical pump 202 also has a shunt pump 1116 through which the auxiliary pump inlet 1116 is fed. The hollow shaft 706 defines a fluid passageway 1114 therethrough to the soft inlet 1110. Fluid entering the shaft inlet 1110 is in fluid communication with the internal motor cavity 1108 via the The inner motor cavity 1108 then leads to a shaft outlet 1112 which is connected to a pump inlet 1124. Together, the mechanical pump 202 and the motor housing 404 are in fluid communication with the A fluid passage 1124 from the inner motor cavity 1108 to the pump outlet 208 via the pump inlet 1124. Define 126.

[0043] Also, as shown in FIG. 11, the oil temperature thermistor 1016 is connected to the shaft outlet 1112. before being substantially heated by the electric pump system 106. A direct or traceable relationship (i.e., the temperature measured at the thermistor = x In this case, the temperature of the fluid at the outlet can be determined by y = function f(x). The outlet 1112 is disposed adjacent to the shaft outlet 1112 so that the outlet 1112 can be Despite the particular arrangement of the oil temperature thermistor 1016, the oil temperature thermistor 101 6 can be located anywhere on ECU 206. In the particular example of FIG. An oil temperature thermistor 1016 is located near the mounting foot 1006. The legs 1006 can be used to transfer heat to the ECU 206. Thus, The oil temperature thermistor 1016 is connected to the mounting leg 1006 and adjacent to the mounting leg 1006. To read the temperature of highly conductive and thermally conductive materials in many ECU traces (not shown) can be used for.

[0044] Also shown in FIG. 11 is a bypass inlet 216 in fluid communication with the interior motor cavity 1108. The bypass inlet 216 prevents oil from flowing through the shaft inlet 1110. In the event of a blockage in the pump, the oil can flow to the inner motor cavity 1108. That is, if a blockage occurs, oil will still flow through the bypass inlet 216. 2 and to the pump outlet 208, thereby powering the electric motor and other components. Although not specifically shown in FIG. 11, it is possible to provide lubrication to the Accordingly, the ECU 206 and the There may also be a small circumferential gap between the motor housing 404. According to the illustrated embodiment, the hollow shaft 706 can be replaced with a solid shaft, In that case, either or both of the bypass inlet 216 and the circumferential gap are internal motors. The motor cavity 1108 can be used to supply oil to the motor cavity 1108. The pump system 106 may use a bypass inlet 216 and / or a circumferential gap. Instead, it relies on the hollow shaft 706 to provide oil to the internal motor cavity 1108. The drug will be delivered.

[0045] FIG. 11 also illustrates a pump 1120 defined by mechanical pump 202 and extending from main pump inlet 1120. A fluid passage 1 extends from the pump through a gerotor 600 to a pump outlet 208. 115 is also shown. Thus, a portion of the fluid passages 1115 and 1126 are common to each other. (i.e., through gerotor 600 to pump outlet 208).

[0046] The fluid passage 1115 may also be referred to as the first fluid passage. 120 may also be referred to as a first pump inlet. The pump inlet 1124 may also be referred to as a second fluid passage. The fluid passage 1114 may also be referred to as a third fluid passage. The auxiliary pump inlet 1116 may also be referred to as a third pump inlet. do.

[0047] 12-14 are side cross-sectional views of an electric pump system 106 according to a disclosed embodiment. FIG. 12 shows a disclosed embodiment detailing a first oil flow path utilizing a first fluid passage. 12 shows a cross-sectional side view of an electric pump system 106 according to an embodiment of the present invention. The fluid enters the electric pump system 106 via the main pump inlet 1120 and is pumped through the gerotor 600 2 shows a first oil flow path that includes oil flowing through the pump and exiting at the pump outlet 208.

[0048] FIG. 13 illustrates an optional third fluid path utilizing the second fluid path 1126 and the third fluid path 1114. FIG. 1 is a side cross-section of an electric pump system 106 according to a disclosed embodiment detailing two oil flow paths. In particular, FIG. 13 shows the oil being pumped to the electric pump through the auxiliary pump inlet 1116. The cooling water enters the cooling system 106, flows into the shaft inlet 1110, and exits the shaft outlet 1112. It enters the motor cavity 1108, passes through the stator 1106 and the rotor 704, and finally The flow enters pump inlet 1124 through gerotor housing 404 and passes through gerotor 600 2 shows a second oil flow path exiting pump outlet 208.

[0049] FIG. 14 is a disclosure detailing an optional third oil flow path utilizing the second fluid passage 1126. 1 shows a cross-sectional side view of an electric pump system 106 according to an embodiment of the present invention. 4, oil enters the electric pump system 106 through the bypass inlet 216 and is pumped through the stator 1106 and rotor 704 , and passes through motor housing 404 to pump inlet 112 4 and exits pump outlet 208 via gerotor 600. As discussed above with respect to FIG. 11, the oil may also be pumped to the ECU 206 and the motor. 404 through a circumferential gap between the bypass inlet 2 16 into the motor housing 404. do.

[0050] FIG. 15 illustrates the electric pump system 106, the auxiliary pump inlet 1116, and the main pump inlet 112. 11-14 showing the pump outlet 208. is doing.

[0051] FIG. 16 is a flow diagram illustrating the operation of the electric pump system according to the disclosed embodiments. Referring to Figs. 11 to 14, Fig. 16 shows an electric pump system according to the disclosed embodiment. The paper presents a method for pumping fluid through a stem. According to the method, oil is pumped through three The oil is pumped along different paths. Through the first path, the oil flows to the main inlet of the mechanical pump. The fluid is received at the first gerotor inlet and flows through the first gerotor inlet and out the pump outlet (step If necessary, oil is received at the auxiliary inlet of the mechanical pump. Then, via a second path, the air passes through the hollow shaft from the shaft inlet to the shaft outlet, and the internal Enters the motor cavity, passes through the motor housing to the second gerotor inlet, and then to the pump outlet If necessary, oil may be pumped through the bypass inlet and out of the bypass (step 1604). and / or received through a circumferential gap between the ECU and the motor housing; If necessary, it flows through a third path to the internal motor cavity and through the motor housing to a second The fluid enters the gerotor inlet and exits the pump outlet (step 1606).

[0052] An advantage of the disclosed embodiment system and method is that the fluid exits the hollow shaft 706 When the electric pump system 106 is in operation, little heat is absorbed by the fluid. Therefore, by measuring at this point, the ECU 206 can The fluid can be accurately read before it is substantially heated by the pump system 106. However, it is expensive due to the need for a communication channel to relay the information to the ECU 206. , with sensors placed at or near the pump inlet adding complexity and additional points of failure. It is not necessary to use the electric pump system 106 before the fluid is substantially heated. The temperature information determines how much heat needs to be rejected from the fluid and the associated To determine what changes to make to the vehicle's operation (e.g., reducing torque) can be used.

[0053] As will be appreciated by those skilled in the art, low speed rotating gears require specific For example, the lower gears before the gears above require oil with a much higher viscosity. A gear of the same size with a higher rotational speed will have much higher centrifugal forces, which will cause adhesion to the gear surface. If the temperature is the same, two different oils may be required to Much more oil is required for high speed gears because the oil temperature is not available in the gearbox. Many oils and many orifices can be used.

[0054] According to embodiments described herein, the fluid temperature determines the efficiency of an associated electric drive unit. To control and optimize the vehicle's cooling and lubrication systems to improve Specifically, the fluid temperature can be controlled to achieve specific lubrication properties. For example, higher oil temperatures reduce drag and hydraulic power. The fluid is pumped through the pump with less viscosity, which can improve efficiency. However, if the oil gets too hot it no longer provides sufficient cooling.

[0055] The oil pump fluid temperature reading feature is a general indicator of the fluid temperature in the electric drive unit system. For example, if the oil gets too hot, Oil that is too hot can damage some components of the drive unit and / or The oil pump is trying to tell you something is wrong, which can shorten its life and cause problems. The car computer can be alerted.

[0056] In other words, the fluid temperature is used to monitor the health and performance of the drive unit. In addition to temperature, the ECU can also measure pump speed, pump current composition, oil pressure, and Other information, such as the engine pressure, or other information, can then be acquired by the ECU. The information obtained is used to independently monitor the health of the oil pump and the overall drive unit. The algorithm can be used to determine when the oil needs to be changed. Providing service indications, such as when there is a problem or the driveline needs repair. This can be done.

[0057] In the foregoing specification, the present disclosure has been described with reference to specific embodiments. As will be appreciated by those skilled in the art, the various embodiments disclosed herein are intended to be within the spirit and scope of the present disclosure. It may be modified or implemented in various other ways without departing from the scope of the present invention. Therefore, this description should be considered as illustrative and not restrictive of the disclosed systems, methods, and This invention teaches those skilled in the art how to make and use various embodiments of a computer program product. The forms of disclosure shown and described herein are intended to be representative of It is to be understood that the present invention is to be construed as an embodiment. or steps may be substituted for those typically illustrated and described herein. Moreover, certain features of the disclosure may be utilized independently of the use of other features. all of which will be apparent to those of ordinary skill in the art after having the benefit of this description of the present disclosure. There will be.

[0058] As used herein, the terms "comprises" and "comprises" are used interchangeably. "mprising", "includes", "including ", "has", "having" or any contextual variation thereof is intended to cover non-exclusive inclusion. For example, a process with a list of elements The term "service, product, article, or device" refers to any , or any process, product, article, or device not expressly listed. It may contain other elements specific to the location, unless expressly stated otherwise. Unless otherwise stated, "or" refers to an inclusive or and not to an exclusive or. For example, a condition "A or B" is satisfied by one of the following: A is true (or or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), and both A and B are true (or exist).

[0059] Although the steps, operations, or computations may be presented in a particular order, this order may be varied. In some embodiments, the multiple To the extent that steps are shown as sequential, such steps in alternative embodiments may be Some combinations of steps may be performed simultaneously. A series of actions can be interrupted, paused, canceled, or controlled by other processes. can be done.

[0060] One or more of the elements depicted in the drawings / figures may also be useful depending on the particular application. It may be implemented in a more separated or integrated manner, or may be modified to operate in specific cases, such as It will also be appreciated that the content may be deleted or rendered as inoperable.

Claims

1. A motor having a first side and a second side, the motor comprising: Stator, a rotor including a shaft; and a housing around the stator and rotor, the housing having an internal motor cavity and a motor including a housing defining a bypass inlet in fluid communication with the internal motor cavity; an electronic control unit connected to a first side of the motor; a first pump inlet connected to a second side of the motor and connected to a first pump outlet; a mechanical pump defining a fluid passageway; The motor housing and the mechanical pump further include a second pump inlet. The apparatus defines a second fluid passageway from the internal motor cavity to the pump outlet.

2. The apparatus of claim 1 , wherein the electronic control unit further comprises a thermistor.

3. The shaft is a hollow shaft defining a shaft inlet and a shaft outlet; The mechanical pump defines a third fluid passageway from a third pump inlet to the shaft inlet. The apparatus of claim 1 , wherein the shaft outlet is in fluid communication with the internal motor cavity. 。

4. at least a portion of the first fluid passage and the second fluid passage are common to each other. Item 3. The device according to item 3.

5. The apparatus of claim 1 , wherein the mechanical pump is a gerotor.

6. the electronic control unit includes a microcontroller that controls the mechanical pump; 2. The apparatus of claim 1.

7. The apparatus of claim 1 , wherein the electronic control unit includes cooling ribs.

8. An electric pump system having a mechanical pump and a motor housing defining an internal motor cavity.

1. A method of pumping a fluid through a system, comprising: A first fluid passageway connects a first pump inlet of the mechanical pump to a second pump inlet of the mechanical pump. pumping the fluid to a pump outlet; A bypass defined within the motor housing and in fluid communication with the internal motor cavity. pumping the fluid through a gas inlet; through a second fluid passage defined within the motor housing and within the mechanical pump; a second pump inlet of the mechanical pump through the internal motor cavity to the pump outlet and pumping the fluid into a

9. The method of claim 8, further comprising measuring the temperature of the fluid using a thermistor. method.

10. A third fluid passage is provided from the third pump inlet of the mechanical pump to the shaft inlet and and pumping the fluid into a hollow shaft defining a shaft outlet, The method of claim 8 , wherein a shaft outlet is in fluid communication with the internal motor cavity.

11. The internal circuit is connected to the motor housing via a gap formed between the motor housing and the electronic control unit. The method of claim 8 further comprising pumping the fluid into an internal motor cavity.

12. The method of claim 8 , wherein the mechanical pump comprises a gerotor.

13. The mechanical pump is controlled by an electronic control unit including a microcontroller. The method of claim 8 further comprising the step of:

14. A system comprising an apparatus, the apparatus comprising: A motor having a first side and a second side, the motor comprising: Stator, a rotor including a shaft; and a housing around the stator and rotor, the housing having an internal motor cavity and a motor including a housing defining a bypass inlet in fluid communication with the internal motor cavity; an electronic control unit connected to a first side of the motor; a first fluid connected to the second side of the motor from a first pump inlet to a pump outlet; A mechanical pump defining a passageway, The motor housing and mechanical pump further include a second pump inlet. a mechanical pump defining a second fluid passageway from the internal motor cavity to the pump outlet; a heat exchanger in fluid communication with the pump outlet; an oil reservoir in fluid communication with the first pump inlet; Including, the system.

15. The system of claim 14 , wherein the electronic control unit further comprises a thermistor.

16. The shaft is a hollow shaft defining a shaft inlet and a shaft outlet; The mechanical pump defines a third fluid passageway from a third pump inlet to the shaft inlet.

15. The system of claim 14, wherein the shaft outlet is in fluid communication with the internal motor cavity. Stem.

17. at least a portion of the first fluid passage and the second fluid passage are common to each other. Item 15. The system described in item 14.

18. The system of claim 14 , wherein the mechanical pump is a gerotor.

19. the electronic control unit includes a microcontroller that controls the mechanical pump; The system of claim 14.

20. The system of claim 14 , wherein the electronic control unit includes cooling ribs.

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