Cooling and lubricating device and vehicle

Abstract

The invention relates to a cooling and lubricating device and a vehicle in the technical field of vehicles, in the cooling and lubricating device, a mechanical pump and an electronic pump provide lubricating liquid for a cooling loop, the mechanical pump is connected with a first motor, the first motor drives the mechanical pump to rotate when working, and the mechanical pump provides the lubricating liquid for the cooling loop; on the premise that the cooling and heat dissipation requirements of the first motor and the second motor are met, the flow of lubricating liquid provided by the electronic pump to the cooling loop is reduced, namely, the energy consumption of the electronic pump is reduced, meanwhile, the price of the small-flow electronic pump is low, the size is small, and structural arrangement and cost reduction are facilitated.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more particularly to a cooling and lubrication device and a vehicle. Background Technology

[0002] When the electric drive system of a new energy vehicle is working, the stator core, winding ends, rotor, and gear meshing of the motor all generate a lot of heat. In order to improve the power density and operational reliability of the motor, a cooling and lubrication device is needed to cool and lubricate the electric drive system.

[0003] In related technologies, for the case of a single motor, the cooling and lubrication device includes an electronic pump. However, for the case of a dual motor, the cooling and lubrication device still uses an electronic pump. This approach has the following disadvantages: when the two motors work simultaneously, a large cooling capacity is required. The electronic pump consumes a lot of energy when operating under high flow conditions. Furthermore, the price and size of a single high-flow electronic pump are high, which is not conducive to structural layout and cost control. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this disclosure provides a cooling and lubrication device and a vehicle.

[0005] In a first aspect, this disclosure provides a cooling and lubrication device, comprising:

[0006] The reservoir is used to store lubricating fluid;

[0007] A mechanical pump and an electronic pump; the input ends of the mechanical pump and the electronic pump are respectively connected to the liquid storage tank, and the output ends of the mechanical pump and the electronic pump merge to form an output port;

[0008] Cooling circuit; the input end of the cooling circuit is connected to the output port, and the output end of the cooling circuit is connected to the liquid storage tank; the cooling circuit passes through the first motor and the second motor, and is used to cool and lubricate the first motor and the second motor;

[0009] The first motor is connected to the mechanical pump. When the first motor is working, it drives the mechanical pump to rotate, and the mechanical pump provides lubricant to the cooling circuit.

[0010] Optionally, the first motor includes a drive motor, and the second motor includes a generator.

[0011] Optionally, the cooling and lubrication device further includes:

[0012] Controller;

[0013] The controller is configured to control the opening and closing of the electronic pump and to determine a first flow rate of lubricant supplied by the electronic pump to the cooling circuit.

[0014] Optionally, in the first operating condition, the generator operates while the drive motor does not operate, and the controller is configured to: control the electronic pump to start, and determine the first flow rate based on the generator's rotational speed and / or power generation; wherein the first flow rate is positively correlated with the rotational speed and the first flow rate is positively correlated with the power generation.

[0015] Optionally, in the second operating condition, the generator is not operating, the drive motor is operating and its operating power is greater than or equal to a power threshold, and the controller is configured to:

[0016] When the second flow rate of the lubricant supplied by the mechanical pump to the cooling circuit is less than the flow rate threshold, the electronic pump is controlled to turn on, and the first flow rate is determined to be equal to the difference between the flow rate threshold and the second flow rate.

[0017] as well as,

[0018] When the second flow rate is greater than or equal to the flow rate threshold, the electronic pump is controlled to shut down.

[0019] Optionally, in the third operating condition, the generator is not working, the drive motor is working and the working power of the drive motor is less than the power threshold, and the controller is configured to control the electronic pump to shut down.

[0020] Optionally, in the fourth operating condition, both the drive motor and the generator operate, and the controller is configured to:

[0021] When the second flow rate of the lubricant supplied by the mechanical pump to the cooling circuit is less than the flow rate threshold, the electronic pump is controlled to turn on, and the first flow rate is determined to be equal to the difference between the flow rate threshold and the second flow rate.

[0022] as well as,

[0023] When the second flow rate is greater than or equal to the flow rate threshold, the electronic pump is controlled to shut down.

[0024] Optionally, the cooling circuit includes a first circuit and a second circuit connected in parallel, and the cooling and lubrication device further includes:

[0025] A cooler, located in the first circuit and / or the second circuit;

[0026] A filter is located in the first circuit and / or the second circuit.

[0027] Optionally, the cooler is located in the first circuit, and the filter is located in the second circuit;

[0028] The drive motor includes a first rotor and a first stator, and the generator includes a second rotor and a second stator;

[0029] The first rotor and the second rotor are located in the first circuit, and at least one of the first stator and the second stator is located in the second circuit.

[0030] Optionally, the drive motor further includes a first bearing, and the generator includes a second bearing;

[0031] The first circuit includes a first branch arranged in parallel, wherein the first rotor, the second rotor, the second stator, the first bearing, and the second bearing are located in different first branches;

[0032] At least one of the first motor and the second motor further includes: a transmission assembly; the second circuit includes a second branch arranged in parallel, wherein the transmission assembly and the first stator are located in different second branches.

[0033] Optionally, the cooling and lubrication device further includes:

[0034] The first check valve is located between the output end of the mechanical pump and the output port;

[0035] The second check valve is located between the output end of the electronic pump and the output port.

[0036] Secondly, this disclosure also provides a vehicle, including any of the aforementioned cooling and lubrication devices.

[0037] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0038] In the technical solution provided in this disclosure, a mechanical pump and an electronic pump provide lubricant to the cooling circuit. The mechanical pump is connected to the first motor. When the first motor is working, it drives the mechanical pump to rotate. The mechanical pump provides cooling to the cooling circuit. Under the premise of meeting the cooling and heat dissipation requirements of the first motor and the second motor, it is beneficial to reduce the flow rate of the electronic pump to provide lubricant to the cooling circuit, that is, to reduce the energy consumption of the electronic pump. At the same time, the low-flow electronic pump has a lower price and smaller size, which is beneficial to the structural layout and cost reduction. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0040] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a cooling and lubrication device in related technologies;

[0042] Figure 2 This is a schematic diagram of the structure of a cooling and lubrication device provided in an embodiment of the present disclosure;

[0043] Figure 3 This is a schematic diagram of the structure of an electric drive system provided in an embodiment of the present disclosure;

[0044] Figure 4 This is a schematic diagram of another cooling and lubrication device provided in an embodiment of the present disclosure;

[0045] Figure 5 This is a schematic diagram of the structure of another cooling and lubrication device provided in an embodiment of the present disclosure;

[0046] Figure 6 This is a schematic diagram of the structure of another cooling and lubrication device provided in an embodiment of the present disclosure;

[0047] Figure 7 This is a schematic diagram of another cooling and lubrication device provided in an embodiment of the present disclosure. Detailed Implementation

[0048] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0049] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0050] In related technologies, for dual-motor configurations, the cooling and lubrication system still uses a single electric pump, such as... Figure 1As shown, the circulation path of the lubricating fluid is: reservoir 1 → electric pump 21 → filter 6 → cooler 7 → first motor 4, second motor 5, first motor bearing, second motor bearing and transmission assembly 8 → reservoir 1. In the cooler 7, the lubricating fluid exchanges heat with the coolant, thereby reducing its temperature. The lubricating fluid then reaches the motor and transmission assembly 8 through the cooling circuit, achieving the functions of cooling and lubricating the motor and transmission assembly 8. This method has the following disadvantages: when the first motor 4 and the second motor 5 work simultaneously, a large cooling capacity is required. The electric pump 21 needs to operate under high flow conditions, resulting in high energy consumption. Furthermore, the high price and large size of a single high-flow electric pump 21 are detrimental to structural layout and cost control.

[0051] To address the aforementioned technical problems, this disclosure provides a cooling and lubrication device and a vehicle. The cooling and lubrication device includes: a reservoir for storing lubricating fluid; a mechanical pump and an electronic pump; the input ends of the mechanical pump and the electronic pump are respectively connected to the reservoir, and the output ends of the mechanical pump and the electronic pump converge to form an output port; a cooling circuit; the input end of the cooling circuit is connected to the output port, and the output end of the cooling circuit is connected to the reservoir; the cooling circuit passes through a first motor and a second motor, and is used to cool and lubricate the first and second motors; wherein the first motor is connected to the mechanical pump, and when the first motor is working, it drives the mechanical pump to rotate, and the mechanical pump provides lubricating fluid to the cooling circuit. Therefore, in this cooling and lubrication device, the mechanical pump and the electronic pump provide lubricating fluid to the cooling circuit. The mechanical pump is connected to the first motor, and when the first motor is working, it drives the mechanical pump to rotate, and the mechanical pump provides lubricating fluid to the cooling circuit. While meeting the cooling and heat dissipation requirements of the first and second motors, this reduces the flow rate of lubricating fluid supplied by the electronic pump to the cooling circuit, thus reducing the energy consumption of the electronic pump. Furthermore, the low-flow electronic pump is cheaper and smaller, which is beneficial for structural layout and cost reduction.

[0052] The cooling and lubrication device and vehicle provided in the embodiments of this disclosure will be described exemplarily below with reference to the accompanying drawings.

[0053] In some embodiments, such as Figure 2 The diagram shown is a structural schematic of a cooling and lubrication device provided in an embodiment of this disclosure. (Refer to...) Figure 2 The cooling and lubrication device includes: a liquid storage tank 1, an electronic pump 21, a mechanical pump 22, and a cooling circuit 3.

[0054] The reservoir 1 is used to store lubricating fluid. Lubricating fluid includes all liquids with lubricating properties known to those skilled in the art, such as lubricating oil or water, and is not limited thereto.

[0055] The input ends of mechanical pump 22 and electronic pump 21 are respectively connected to the liquid storage tank 1. The output ends of mechanical pump 22 and electronic pump 21 merge to form output port 23, which is connected to the input end of cooling circuit 3. Mechanical pump 22 and electronic pump 21 provide lubricant to cooling circuit 3. Cooling circuit 3 passes through first motor 4 and second motor 5, and its output end is connected to the liquid storage tank 1. The circulation path of the lubricant in this cooling and lubrication device is: liquid storage tank 1 → electronic pump 21 and mechanical pump 22 → input end of cooling circuit 3 → first motor 4 and second motor 5 → output end of cooling circuit 3 → liquid storage tank 1. The lubricant in cooling circuit 3 cools and lubricates first motor 4 and second motor 5.

[0056] The electronic pump 21 is driven by an independent motor, which is controlled by a controller. The controller controls the motor to turn on the electronic pump 21. After the electronic pump 21 is turned on, it draws lubricating fluid from the reservoir 1 and pumps it into the cooling circuit 3. In some embodiments, the electronic pump 21 can also be an integrated electronic pump, that is, the electronic pump body and the motor are integrated.

[0057] Combination Figure 3 The vehicle's electric drive system includes a first motor assembly, a second motor assembly, and an engine assembly. The first motor assembly includes a first motor 4 and a first bearing 43 connected to the first motor 4. The second motor assembly includes a second motor 5 and a second bearing 53 connected to the second motor. The engine assembly includes an engine and a third bearing connected to the engine. The second bearing 53 is connected to the third bearing, which is connected to the engine's rotor, and also to the second rotor of the second motor 5. The engine assembly drives the second motor assembly to generate electricity. Specifically, when the engine starts, its internal rotor rotates, causing the third bearing to rotate, which in turn causes the second bearing 53 to rotate, thereby rotating the second rotor of the second motor 5 and driving the second motor 5 to generate electricity.

[0058] The second motor 5 can be directly electrically connected to the first motor 4. When the second motor 5 generates electricity, it can provide power to the first motor assembly, which in turn drives the vehicle. Specifically, when the second motor 5 generates electricity, it provides power to the first motor 4. After the first motor 4 is energized, it drives the first rotor inside to rotate, which in turn drives the first bearing 43 connected to the first rotor to rotate, thereby driving the vehicle's wheels. The second motor 5 can also be electrically connected to the vehicle's battery pack. The battery pack is electrically connected to the first motor 4. The electrical energy generated by the second motor 5 is stored in the battery pack, which then provides a stable supply of power to the first motor 4.

[0059] The first bearing 43 of the first motor 4 is also connected to the mechanical pump 22 via a transmission assembly, which meshes with the gears of the mechanical pump 22. When the first motor 4 is energized, its first rotor rotates, driving the first bearing 43 connected to it to rotate. This rotation drives the wheels and, simultaneously, the gears of the mechanical pump 22, causing the mechanical pump 22 to supply lubricant to the cooling circuit. With this configuration, the mechanical pump 22 is driven by the first motor 4, eliminating the need for a dedicated motor.

[0060] The flow rate of lubricant supplied by mechanical pump 22 to cooling circuit 3 is positively correlated with the rotational speed of the first motor 4, and the rotational speed of the wheels is also positively correlated with the rotational speed of the first motor 4. Therefore, the flow rate of lubricant supplied by mechanical pump 22 to cooling circuit 3 is positively correlated with the rotational speed of the wheels. The faster the rotor speed of the first motor 4, the faster the rotational speed of the wheels, that is, the faster the vehicle speed, the greater the flow rate of lubricant supplied by mechanical pump 22 to cooling circuit 3.

[0061] In this embodiment, the mechanical pump 22 and the electronic pump 21 provide lubricant to the cooling circuit 3. While meeting the cooling and heat dissipation requirements of the first motor 4 and the second motor 5, this reduces the flow rate of the electronic pump 21 in providing lubricant to the cooling circuit 3, thereby reducing the energy consumption of the electronic pump 21. At the same time, the low-flow electronic pump 21 has a lower price and smaller size, which is beneficial for structural layout and cost reduction.

[0062] In some embodiments, the first motor 4 includes a drive motor, and the second motor 5 includes a generator.

[0063] like Figure 3 As shown, when the engine starts, its internal rotor rotates, driving the third bearing to rotate. The third bearing then drives the second bearing 53 to rotate, which in turn drives the second rotor of the generator to rotate, thus powering the generator to generate electricity. The generator can be directly connected to the drive motor, providing electrical energy to the drive motor when it generates electricity. The generator can also be connected to a battery pack, which is connected to the drive motor. The electrical energy generated by the generator is stored in the battery pack, which then provides a stable supply of electrical energy to the drive motor.

[0064] like Figure 3 As shown, when the drive motor is powered on, the first rotor of the drive motor rotates, which in turn drives the first bearing 43 connected to the first rotor to rotate. While driving the wheels to run, it also drives the gear of the mechanical pump 22 to rotate, thereby the mechanical pump 22 provides lubricant to the cooling circuit.

[0065] In some embodiments, such as Figure 4As shown in Figure 5, the cooling circuit 3 includes a first circuit 31 and a second circuit 32 arranged in parallel. The cooling and lubrication device also includes a cooler 7 and a filter 6. The cooler 7 is located in the first circuit 31 and / or the second circuit 32. The filter 6 is located in the first circuit 31 and / or the second circuit 32.

[0066] The filter 6 is used to remove impurities and solid particles from the lubricating fluid, preventing damage to various components. Based on its location, the filter 6 can be divided into a coarse filter and a fine filter. The filter 6 located between the electric pump 21 and the reservoir 1, and between the mechanical pump 22 and the reservoir 1, is the coarse filter. The filter 6 located in the cooling circuit 3 is the fine filter. The coarse filter filters solid particles (such as metal shavings) from the lubricating fluid, while the fine filter further filters solid particles from the lubricating fluid, ensuring that solid particles do not enter the first motor 4 and the second motor 5, thus guaranteeing the performance and reliability of the first motor 4 and the second motor 5.

[0067] In the cooler 7, the coolant and lubricant exchange heat, thereby reducing the temperature of the lubricant. When the low-temperature lubricant passes through the first motor 4 and the second motor 5, in addition to lubrication, it also cools the first motor 4 and the second motor 5.

[0068] For example, such as Figure 4 As shown, the cooling and lubrication device includes two coolers 7 and two filters 6. The cooling circuit 3 includes a first circuit 31 and a second circuit 32 arranged in parallel. One cooler 7 and filter 6 are located in the first circuit 31, and the other cooler 7 and filter 6 are located in the second circuit 32.

[0069] In some embodiments, such as Figure 5 As shown, the cooler 7 is located in the first circuit 31, and the filter 6 is located in the second circuit 32; the drive motor includes a first rotor 41 and a first stator 42, and the generator includes a second rotor 51 and a second stator 52; the first rotor 41 and the second rotor 51 are located in the first circuit 31, and at least one of the first stator 42 and the second stator 52 is located in the second circuit 32.

[0070] When the drive motor is in operation, the heat generated by the first rotor 41 is greater than that generated by the first stator 42. When the generator is in operation, the heat generated by the second rotor 51 is greater than that generated by the second stator 52. In this embodiment, the equipment cost of the cooling and lubrication device is reduced by decreasing the number of coolers 7 and filters 6. The first circuit 31 and the second circuit 32 share the same lubricating fluid in the same storage tank, and the lubricating fluid in the entire cooling and lubrication device can be filtered by a single filter 6. By placing the cooler 7 in the first circuit, and also placing the first rotor 41 and the second rotor 51 in the first circuit, the lubricating fluid cooled by the cooler 7 can better cool the first rotor 41 and the second rotor 51, preventing the temperature of the first rotor 41 and the second rotor 51 from becoming too high, thus meeting the cooling and heat dissipation requirements of the first motor 4 and the second motor 5.

[0071] For example, such as Figure 5 As shown, in this cooling and heat dissipation device, the cooling circuit 3 includes a first circuit 31 and a second circuit 32 arranged in parallel. The cooler 7 is located in the first circuit 31. The lubricating fluid cooled by the cooler 7 passes through the first rotor 41, the second rotor 51 and the second stator 52. The filter 6 and the first stator 42 are located in the second circuit 32. After passing through the filter 6 and the first stator 42 in sequence, the lubricating fluid flows back to the storage tank 1.

[0072] It should be noted that, Figure 5 The illustration only shows the first stator 42 located in the second circuit 32 and the second stator 52 located in the first circuit 31, and does not constitute a limitation on the cooling and lubrication device provided in the embodiments of this disclosure. In other embodiments, both the first stator 42 and the second stator 52 may be located in the second circuit 32, which is not limited here.

[0073] In some embodiments, such as Figure 6 As shown, the drive motor further includes a first bearing 43, and the generator includes a second bearing 53; the first circuit 31 includes a first branch 311 arranged in parallel, and the first rotor 41, the second rotor 51, the second stator 52, the first bearing 43 and the second bearing 53 are located in different first branches 311; at least one of the first motor and the second motor further includes a transmission assembly 8; the second circuit 32 includes a second branch 321 arranged in parallel, and the transmission assembly 8 and the first stator 42 are located in different second branches 321.

[0074] The first bearing 43 is connected to the first rotor 41. When the drive motor is working, the first bearing 43 rotates under the drive of the first rotor 41. During the rotation, the connecting parts rub against each other, causing the first bearing 43 to generate heat. When the first bearing 43 has problems such as inaccurate installation, excessive load on the drive motor, or too little or too much lubricant, it may generate more heat, leading to overheating of the first bearing 43, and in severe cases, even damage to the first bearing 43.

[0075] The second bearing 53 is connected to the second rotor 51. The engine's third bearing drives the second bearing 53 to rotate, which in turn drives the generator's second rotor 52 to rotate, thus powering the generator to generate electricity. Similarly, the second bearing 53 also has the same problem. During rotation, the connecting parts of the second bearing 53 rub against each other, causing the second bearing 53 to generate heat. If the second bearing 53 is not installed accurately, the generator load is too high, or there is too little or too much lubricating fluid, it may generate more heat, leading to overheating of the second bearing 53, and in severe cases, damage to the second bearing 53.

[0076] In this embodiment, the first bearing 43 and the second bearing 53 are arranged in the first circuit 31, and the cooler 7 is also arranged in the first circuit 31. The lubricating fluid cooled by the cooler 7 can better cool the first bearing 43 and the second bearing 53, preventing the first bearing 43 and the second bearing 53 from overheating, so as to meet the cooling and heat dissipation requirements of the first motor 4 (or drive motor) and the second motor 5 (or generator).

[0077] The transmission assembly 8 includes at least one of a shaft, gears, a reducer, and a differential. The heat dissipation requirements of the transmission assembly 8 are relatively low, and it can be located in the second circuit 32.

[0078] In some embodiments, such as Figure 7 As shown, the cooling and lubrication device also includes a first check valve 91, which is located between the output end of the mechanical pump 22 and the output port 23.

[0079] In this configuration, lubricating fluid flows from mechanical pump 22 to output port 23, with the first check valve 91 in an open state, allowing lubricating fluid to pass through. Conversely, when lubricating fluid flows from output port 23 back to mechanical pump 22, the first check valve 91 is closed, preventing lubricating fluid from passing through. This configuration prevents lubricating fluid backflow via the first check valve 91. The first check valve 91 includes a one-way valve.

[0080] In some embodiments, such as Figure 7 As shown, the cooling and lubrication device also includes a second check valve 92, which is located between the output end of the electric pump 21 and the output port 23.

[0081] In this configuration, lubricating fluid flows from the electronic pump 21 to the output port 23, where the second check valve 92 is in the open state, allowing lubricating fluid to pass through. Conversely, when lubricating fluid flows from the output port 23 back to the electronic pump 21, the second check valve 92 is in the closed state, preventing lubricating fluid from passing through. This arrangement prevents lubricating fluid backflow through the second check valve 92. The second check valve 92 includes a one-way valve.

[0082] In some embodiments, the cooling and lubrication device further includes a controller configured to control the opening and closing of the electronic pump 21 and determine a first flow rate of coolant lubricant supplied by the electronic pump 21 to the cooling circuit 3.

[0083] If the electronic pump 21 is driven by an independent motor, the controller is electrically connected to the motor; if the electronic pump 21 is an integrated electronic pump, the controller is electrically connected to the motor in the integrated electronic pump.

[0084] In this embodiment, the lubrication and cooling device supplies lubricant to the cooling circuit 3 via an electronic pump 21 and a mechanical pump 22. The flow rate of lubricant supplied by the electronic pump 21 to the cooling circuit 3 is a first flow rate Q1, and the flow rate of lubricant supplied by the mechanical pump 22 to the cooling circuit 3 is a second flow rate Q2. The mechanical pump 22 is driven by a drive motor, and the second flow rate Q2 is positively correlated with the rotational speed of the drive motor; the faster the rotational speed of the drive motor, the larger the second flow rate Q2; when the drive motor is not working, the second flow rate Q2 is equal to 0. As mentioned above, the controller controls the motor to turn the electronic pump 21 on or off. When the electronic pump 21 is on, it begins to supply lubricant to the cooling circuit 3, i.e., the first flow rate Q1 is greater than 0; when the electronic pump 21 is off, it stops supplying lubricant to the cooling circuit 3, i.e., the first flow rate Q1 is equal to 0.

[0085] The magnitude of the first flow rate Q1 is related to the operating conditions, as detailed below.

[0086] In the first operating condition, the generator is working and the drive motor is not working, that is, in the power generation only operating condition, the controller is configured to: control the electronic pump 21 to start, and determine the first flow rate Q1 according to the generator speed and / or power generation; wherein, the first flow rate Q1 is positively correlated with the speed and the first flow rate Q1 is positively correlated with the power generation.

[0087] Under this operating condition, the drive motor is not working, the wheels do not rotate, and the mechanical pump 22 is not working, so it does not supply lubricant to the cooling circuit 3, meaning the second flow rate Q2 is equal to 0. The generator is operating and requires the electronic pump 21 to supply lubricant to the cooling circuit to meet its cooling and heat dissipation needs. The higher the generator's speed and the greater its power output, the more heat is generated, requiring the electronic pump 21 to supply more lubricant, i.e., a larger first flow rate Q1, to meet the generator's cooling and heat dissipation requirements. Under this operating condition, the total flow rate Q of the lubricant in the cooling circuit 3 is... total Equal to the first flow Q1, i.e., Q total =Q1.

[0088] In the second operating condition, the generator is not working, the drive motor is working and the working power of the drive motor is greater than or equal to the power threshold, i.e., the drive-only operating condition. The controller is configured to: control the electronic pump 21 to turn on when the second flow rate Q2 of the mechanical pump 22 supplying coolant and lubricant to the cooling circuit 3 is less than the flow rate threshold Q, and determine that the first flow rate Q1 is equal to the difference between the flow rate threshold Q and the second flow rate Q2; and control the electronic pump to turn off when the second flow rate Q2 is greater than or equal to the flow rate threshold Q.

[0089] Under this operating condition, the drive motor operates, the wheels rotate, and the mechanical pump 22 operates, supplying lubricant to the cooling circuit 3. The second flow rate Q2 is greater than 0. The second flow rate Q2 is positively correlated with the speed of the drive motor (or the wheel speed); the faster the speed of the drive motor (or the wheel speed), the greater the second flow rate Q2. When the second flow rate Q2 is less than the flow threshold Q, the remaining flow is supplemented by the electronic pump 21. That is, the first flow rate Q1 is equal to the difference between the flow threshold Q and the second flow rate Q2, i.e., Q1 = Q - Q2, ensuring the total flow rate Q of the lubricant in the cooling circuit 3. total Equal to the flow threshold Q, i.e., Q total =Q1 + Q2 = Q. When the second flow rate Q2 is greater than or equal to the flow threshold Q, the second flow rate Q2 of the lubricant supplied by the mechanical pump 22 to the cooling circuit exceeds the flow threshold Q, and the electronic pump 21 no longer needs to supply lubricant. The electronic pump 21 is then shut down. At this time, the total flow rate Q of the lubricant in the cooling circuit 3 is Q. total Equal to the second flow Q2, i.e., Q total =Q2.

[0090] In some embodiments, the flow threshold Q is equal to 16 L / min.

[0091] In the third operating condition, the generator is not working, the drive motor is working and the power of the drive motor is less than the power threshold, i.e., only reverse drag operation, the controller is configured to: control the electronic pump to shut down.

[0092] Among them, the reverse towing condition refers to four-wheel drive vehicles, where the rear-wheel drive does work and the front-wheel drive does not, and the front-wheel drive rotates under the drag of the rear-wheel drive.

[0093] Under this operating condition, the drive motor operates, the wheels rotate, and the mechanical pump 22 operates, supplying lubricant to the cooling circuit 3. The second flow rate Q2 is greater than 0. The second flow rate Q2 is positively correlated with the speed of the drive motor (or the wheel speed); the faster the speed of the drive motor (or the wheel speed), the greater the second flow rate Q2. At this time, the generator does not operate, and only the drive motor operates at a lower power. The entire electric drive system generates less heat, meaning the cooling demand is low. Therefore, only the mechanical pump 22 needs to supply lubricant to the cooling circuit 3; the electronic pump 21 is not required. The electronic pump 21 is controlled to shut down, meaning the first flow rate Q1 equals 0. Under this operating condition, the total flow rate Q of the lubricant in the cooling circuit 3 is... total Equal to the second flow Q2, i.e., Q total =Q2.

[0094] In the fourth operating condition, both the drive motor and the generator are working, and the controller is configured to: control the electronic pump 21 to turn on when the second flow rate Q2 of the mechanical pump 22 supplying lubricant to the cooling circuit 3 is less than the flow threshold Q, and determine that the first flow rate Q1 is equal to the difference between the flow threshold Q and the second flow rate Q2; and control the electronic pump 21 to turn off when the second flow rate Q2 is greater than or equal to the flow threshold Q.

[0095] The fourth operating condition includes two modes: generator + drive mode and generator + reverse drag mode. In the generator + drive mode, both the generator and the drive motor operate, and the drive motor's operating power is greater than or equal to the power threshold. In the generator + reverse drag mode, both the generator and the drive motor operate, and the drive motor's operating power is less than the power threshold.

[0096] Under this operating condition, the drive motor operates, the wheels rotate, and the mechanical pump 22 operates, supplying lubricant to the cooling circuit 3. The second flow rate Q2 is greater than 0. The second flow rate Q2 is positively correlated with the speed of the drive motor (or the wheel speed); the faster the speed of the drive motor (or the wheel speed), the greater the second flow rate Q2. When the second flow rate Q2 is less than the flow threshold Q, the remaining flow is supplemented by the electronic pump 21. That is, the first flow rate Q1 is equal to the difference between the flow threshold Q and the second flow rate Q2, i.e., Q1 = Q - Q2, ensuring the total flow rate Q of the lubricant in the cooling circuit 3. total Equal to the flow threshold Q, i.e., Q total=Q1 + Q2 = Q, which can meet the cooling and heat dissipation requirements of the drive motor and generator. When the second flow rate Q2 is greater than or equal to the flow threshold Q, the second flow rate Q2 of the lubricant supplied by the mechanical pump 22 to the cooling circuit exceeds the flow threshold Q, and the electronic pump 21 no longer needs to supply lubricant. The electronic pump 21 is then shut down. At this time, the total flow rate Q of the lubricant in the cooling circuit 3 is... total Equal to the second flow Q2, i.e., Q total =Q2.

[0097] In some embodiments, flow control valves are provided in the first branch 311 and the second branch 321. These flow control valves are located in the branch before the device to be cooled and lubricated (e.g., the first rotor 41, the second rotor 51, the first stator 42, or the second stator 52), and are used to regulate the flow rate of lubricant in the corresponding branch, thereby distributing the lubricant in each branch to meet the cooling and heat dissipation requirements of all devices to be cooled and lubricated. The distribution ratio of lubricant in each branch is controlled by adjusting the opening degree of the flow control valves.

[0098] For example, such as Figure 7 As shown, the total flow rate of coolant in cooling circuit 3 is Q. total The first circuit includes four first branches, and the second circuit includes two second branches. The distribution ratio of lubricant in each branch is a to f, and the flow rate of lubricant in each branch is a × Q. total b×Q total c×Q total d×Q total e×Q total and f×Q total .

[0099] Based on the above embodiments, this disclosure also provides a vehicle, which includes any of the above-mentioned cooling and lubrication devices, and has corresponding beneficial effects. To avoid repetition, these will not be repeated here.

[0100] The vehicles include pure electric vehicles and hybrid vehicles.

[0101] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0102] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling and lubrication device, characterized in that, include: A reservoir for storing lubricating fluid; Mechanical pumps and electric pumps; The input end of the mechanical pump and the input end of the electronic pump are respectively connected to the liquid storage tank, and the output end of the mechanical pump and the output end of the electronic pump merge to form an output port; Cooling circuit; the input end of the cooling circuit is connected to the output port, and the output end of the cooling circuit is connected to the liquid storage tank; the cooling circuit passes through the first motor and the second motor, and is used to cool and lubricate the first motor and the second motor; The first motor is connected to the mechanical pump. When the first motor is working, it drives the mechanical pump to rotate, and the mechanical pump provides lubricant to the cooling circuit.

2. The cooling and lubrication device according to claim 1, characterized in that, The first motor includes a drive motor, and the second motor includes a generator.

3. The cooling and lubrication device according to claim 2, characterized in that, Also includes: Controller; The controller is configured to control the opening and closing of the electronic pump and to determine a first flow rate of lubricant supplied by the electronic pump to the cooling circuit.

4. The cooling and lubrication device according to claim 3, characterized in that, In the first operating condition, the generator is working, the drive motor is not working, and the controller is configured to: control the electronic pump to start, and determine the first flow rate based on the generator's rotational speed and / or power generation; wherein the first flow rate is positively correlated with the rotational speed and the first flow rate is positively correlated with the power generation.

5. The cooling and lubrication device according to claim 3, characterized in that, In the second operating condition, the generator is not operating, the drive motor is operating and its operating power is greater than or equal to a power threshold, and the controller is configured as follows: When the second flow rate of the lubricant supplied by the mechanical pump to the cooling circuit is less than the flow rate threshold, the electronic pump is controlled to turn on, and the first flow rate is determined to be equal to the difference between the flow rate threshold and the second flow rate. as well as, When the second flow rate is greater than or equal to the flow rate threshold, the electronic pump is controlled to shut down.

6. The cooling and lubrication device according to claim 3, characterized in that, In the third operating condition, the generator is not working, the drive motor is working and the working power of the drive motor is less than the power threshold, and the controller is configured to control the electronic pump to shut down.

7. The cooling and lubrication device according to claim 3, characterized in that, In the fourth operating condition, both the drive motor and the generator are operating, and the controller is configured as follows: When the second flow rate of the lubricant supplied by the mechanical pump to the cooling circuit is less than the flow rate threshold, the electronic pump is controlled to turn on, and the first flow rate is determined to be equal to the difference between the flow rate threshold and the second flow rate. as well as, When the second flow rate is greater than or equal to the flow rate threshold, the electronic pump is controlled to shut down.

8. The cooling and lubrication device according to claim 2, characterized in that, The cooling circuit includes a first circuit and a second circuit connected in parallel, and the cooling and lubrication device further includes: A cooler, located in the first circuit and / or the second circuit; A filter is located in the first circuit and / or the second circuit.

9. The cooling and lubrication device according to claim 8, characterized in that, The cooler is located in the first circuit, and the filter is located in the second circuit; The drive motor includes a first rotor and a first stator, and the generator includes a second rotor and a second stator; The first rotor and the second rotor are located in the first circuit, and at least one of the first stator and the second stator is located in the second circuit.

10. The cooling and lubrication device according to claim 9, characterized in that, The drive motor further includes a first bearing, and the generator includes a second bearing; The first circuit includes a first branch arranged in parallel, wherein the first rotor, the second rotor, the second stator, the first bearing, and the second bearing are located in different first branches; At least one of the first motor and the second motor further includes: a transmission assembly; the second circuit includes a second branch arranged in parallel, wherein the transmission assembly and the first stator are located in different second branches.

11. The cooling and lubrication device according to claim 1, characterized in that, Also includes: The first check valve is located between the output end of the mechanical pump and the output port; The second check valve is located between the output end of the electronic pump and the output port.

12. A vehicle, characterized in that, include: The cooling and lubrication device as described in any one of claims 1-11.

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