Double-electric-drive lubricating system, double-electric-drive system and double-electric-drive lubricating control method

Abstract

The invention provides a double-electric-drive lubricating system, a double-electric-drive system and a double-electric-drive lubricating control method, and relates to the technical field of new energy automobiles. The system comprises a controller, an oil pan, a first lubricating branch, a second lubricating branch and an interconnection path, the first lubricating branch comprises a first oil pump and a first cooler which are sequentially connected through a first lubricating oil way. The second lubricating branch comprises a second oil pump and a second cooler which are sequentially connected through a second lubricating oil way. The interconnection passage is respectively connected with the first lubricating oil passage and the second lubricating oil passage, and the first end of the interconnection passage is arranged between the first cooler and the second end of the first lubricating oil passage; the second end of the interconnection path is arranged between the second cooler and the second end of the second lubricating oil path; the controller is connected with the first oil pump, the second oil pump and the adjustable valve. The purpose of supplying oil as required is achieved through the first lubricating branch, the second lubricating branch and the interconnection passage with the adjustable valve, and the lubricating performance is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and specifically, to a dual electric drive lubrication system, a dual electric drive system, and a dual electric drive lubrication control method. Background Art

[0002] With the development of new energy vehicle technology, the requirements for electric drive systems are getting higher and higher. The dual electric drive assembly can distribute power more accurately and improve the vehicle's handling and stability by using two motors on each axle. However, due to the increasing integration of the dual electric drive assembly and the increase in power density, lubricants are required to provide better cooling performance.

[0003] However, in the prior art, usually only one set of oil pumps is arranged to lubricate the motors and reducers on the left and right sides, which leads to the problem of not being able to take into account the different requirements of the left and right sides of the dual electric drive system. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a dual electric drive lubrication system, a dual electric drive system and a dual electric drive lubrication control method, so as to realize on-demand oil supply to the electric drives on the left and right sides of the dual electric drive system and improve the lubrication performance.

[0005] In the first aspect, an embodiment of the present application provides a dual-electric drive lubrication system, which includes a controller, an oil pan, a first lubrication branch, a second lubrication branch and an interconnecting passage; the oil pan includes a first oil suction port and a second oil suction port; the first lubrication branch includes a first oil pump and a first cooler connected in sequence through a first lubrication oil circuit; the first end of the first lubrication oil circuit is connected to the first oil suction port, and the second end is connected to the first motor reducer unit; the second lubrication branch includes a second oil pump and a second cooler connected in sequence through a second lubrication oil circuit; the first end of the second lubrication oil circuit is connected to the second oil suction port, and the second end is connected to the second motor reducer unit; the interconnecting passage is respectively connected to the first lubrication oil circuit and the second lubrication oil circuit, and the first end of the interconnecting passage is arranged between the first cooler and the second end of the first lubrication oil circuit; the second end of the interconnecting passage is arranged between the second cooler and the second end of the second lubrication oil circuit; the controller is connected to the first oil pump, the second oil pump and the adjustable valve, for controlling the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve respectively.

[0006] In the embodiment of the present application, a first lubrication branch is connected to the first motor reducer unit, and a second lubrication branch is connected to the second motor reducer. Since the first lubrication branch and the second lubrication branch are each provided with a corresponding oil pump, the corresponding oil pump can supply oil according to the respective needs of the first motor reducer and the second motor reducer. Furthermore, an interconnection passage is also provided between the first lubrication branch and the second lubrication branch, and an adjustable valve capable of adjusting the degree of opening and closing is provided on the interconnection passage, so that even when only one oil pump is working, the purpose of supplying oil on demand can be achieved by adjusting the degree of opening and closing of the adjustable valve, thereby improving the lubrication performance.

[0007] In some embodiments, the first lubrication branch also includes a first one-way valve; the first one-way valve is arranged between the first cooler and the first end of the interconnecting passage; the second lubrication branch also includes a second one-way valve; the second one-way valve is arranged between the second cooler and the second end of the interconnecting passage.

[0008] The embodiment of the present application sets a first one-way valve between the first cooler and the first end of the interconnecting passage, and sets a second one-way valve between the second cooler and the second end of the interconnecting passage, so as to prevent the lubricating oil from flowing in the reverse direction and make it flow in the correct direction, thereby protecting the lubrication system and improving efficiency.

[0009] In some embodiments, the first lubrication branch further includes a first pressure filter; the first pressure filter is arranged between the first oil pump and the first cooler; the second lubrication branch further includes a second pressure filter; the second pressure filter is arranged between the second oil pump and the second cooler.

[0010] In the embodiment of the present application, pressure filters are respectively arranged between the oil pump and the cooler of the two lubrication branches to filter the lubricating oil pumped out by the oil pump, prevent the oil circuit and tiny oil pores from being clogged by impurities, ensure that the oil can flow smoothly to the parts that need lubrication, and improve the lubrication performance.

[0011] In some embodiments, the first oil suction port includes a first filter screen; the second oil suction port includes a second filter screen; the first oil suction port and the second oil suction port are arranged at the bottom of the oil pan and are symmetrically arranged around the center of the bottom of the oil pan.

[0012] The embodiment of the present application sets a filter at the oil suction port to prevent larger particles, such as dust, metal chips, worn bearing particles, rust and other contaminants, from entering the oil circuit, thereby preventing wear of the lubrication system, maintaining the cleanliness and quality of the lubricating oil, and improving the lubrication performance.

[0013] In some embodiments, the second end of the first lubrication oil circuit includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the first motor reducer unit; the second end of the second lubrication oil circuit includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the second motor reducer unit.

[0014] The embodiment of the present application takes into account the different requirements for lubricating oil required by each component in the first motor reducer unit and the second motor reducer unit, so that branches of different sizes are set corresponding to different components, so as to achieve the purpose of supplying oil to each component in the motor reducer unit on demand, thereby improving the lubrication performance on the basis of achieving energy saving.

[0015] In some embodiments, the end of each branch includes a nozzle.

[0016] The embodiment of the present application sets a nozzle on each branch to accurately spray the lubricating oil onto the components that need lubrication in a spraying manner, ensuring that the lubricating oil can evenly cover the friction surface to form a continuous oil film, thereby reducing wear and improving efficiency.

[0017] In the second aspect, an embodiment of the present application provides a dual electric drive system, comprising a first motor reducer unit, a second motor reducer unit and the dual electric drive lubrication system of the first aspect; the first lubrication branch of the dual electric drive lubrication system is connected to the first motor reducer unit, and the second lubrication branch of the dual electric drive lubrication system is connected to the second motor reducer unit.

[0018] In an embodiment of the present application, the first lubrication branch of the dual electric drive lubrication system is connected to the first motor reducer unit, and the second lubrication branch of the dual electric drive lubrication system is connected to the second motor reducer unit, so that the corresponding lubrication branches can supply oil according to the respective needs of the first motor reducer and the second motor reducer, thereby improving the lubrication performance.

[0019] In a third aspect, an embodiment of the present application provides a dual electric drive lubrication control method, which is applied to the controller of the first aspect, and the method includes: receiving status information of the first motor reducer unit and status information of the second motor reducer unit; determining a first amount of lubricating oil required for the first motor reducer unit based on the status information of the first motor reducer unit; determining a second amount of lubricating oil required for the second motor reducer unit based on the status information of the second motor reducer unit; generating a control strategy according to the first amount of lubricating oil and the second amount of lubricating oil, so as to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve through the control strategy.

[0020] The embodiment of the present application generates a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve. In this process, since the first lubricating oil quantity is determined based on the status information of the first motor reducer unit, and the second lubricating oil quantity is determined based on the status information of the second motor reducer unit, it is possible to supply oil on demand according to different lubricating oil quantity requirements, thereby improving lubrication performance.

[0021] In some embodiments, before generating a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity, the method also includes: receiving vehicle operating status information; the vehicle operating status information includes at least one of vehicle tilt status information, fault information of the first oil pump and fault information of the second oil pump; accordingly, generating a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity includes: generating a control strategy based on the vehicle operating status information, the first lubricating oil quantity and the second lubricating oil quantity.

[0022] The embodiments of the present application can more accurately control the supply method of lubricating oil and improve lubrication efficiency and performance by taking into account the operating status of the vehicle and the working condition of the oil pump.

[0023] In some embodiments, a control strategy is generated according to vehicle operation status information, a first lubricating oil quantity and a second lubricating oil quantity, including: judging the working status of the first oil pump and the second oil pump according to the vehicle operation status information; the working status includes a normal state, an empty state and a fault state; if the first oil pump and the second oil pump are in a normal state, and the first lubricating oil quantity and the second lubricating oil quantity are less than a preset oil quantity threshold, the adjustable valve is fully opened and one of the first oil pump and the second oil pump is closed, and the speed of the oil pump in the open state is determined based on the first lubricating oil quantity and the second lubricating oil quantity; if the first oil pump and the second oil pump are in a normal state, and the first lubricating oil quantity or the second lubricating oil quantity is not less than the preset oil quantity threshold, the adjustable valve is closed, and the speed of the first oil pump is determined based on the first lubricating oil quantity, and the speed of the second oil pump is determined based on the second lubricating oil quantity; if the working status of one of the first oil pump and the second oil pump is in an empty state or a fault state, the oil pump in the empty state or the fault state is closed, and the speed of the oil pump in the open state and the opening and closing degree of the adjustable valve are determined based on the first lubricating oil quantity and the second lubricating oil quantity.

[0024] The embodiment of the present application executes different control strategies through analysis of the working status of the first oil pump and the second oil pump to meet the oil quantity requirements under different working conditions, achieve the purpose of on-demand oil supply, and improve lubrication performance.

[0025] Other features and advantages of the present application will be described in the subsequent description, and in part will become apparent from the description, or will be understood by implementing the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of a first dual electric drive lubrication system provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a second dual-electric drive lubrication system provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of a third dual-electric drive lubrication system provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a motor reducer unit provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a fourth dual-electric drive lubrication system provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of a dual electric drive system provided in an embodiment of the present application;

[0033] Figure 7 A schematic flow chart of a dual electric drive lubrication control method provided in an embodiment of the present application.

[0034] Icons: 10-dual electric drive lubrication system, 20-dual electric drive system, 11-controller, 12-oil pan, 13-first lubrication branch, 14-second lubrication branch, 15-interconnection passage, 16-first motor reducer unit, 17-second motor reducer unit, 121-first oil suction port, 122-second oil suction port, 131-first lubrication oil circuit, 132-first oil pump, 133-first cooler, 134-first one-way valve, 135-first pressure filter cleaner, 141-second lubricating oil circuit, 142-second oil pump, 143-second cooler, 144-second one-way valve, 145-second pressure filter, 151-adjustable valve, A1-first end of the first lubricating oil circuit 131, A2-first end of the second lubricating oil circuit 141, A3-first end of the interconnecting passage 15, B1-second end of the first lubricating oil circuit 131, B2-second end of the second lubricating oil circuit 141, B3-second end of the interconnecting passage 15. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] It should be noted that all technical and scientific terms used in this document have the same meanings as those generally understood by technicians in the technical field to which this application belongs; the terms used in this document are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Distributed dual electric drive assemblies usually have two sets of motors and reducers that are symmetrical on the left and right, and each set of motors and reducers can work independently of each other. When working, the motors and reducers often require oil for cooling and lubrication. For the lubrication system of the distributed dual electric drive assembly, the conventional solution is to arrange an oil pump in the center of the oil pan. After pumping the oil, the lubrication oil circuit is divided into two branches to lubricate the motors and reducers on the left and right sides respectively. However, this solution has the following disadvantages:

[0039] 1. The two motors and reducers receive oil lubrication at the same time. The lubricating oil flow rate changes with the oil pump speed, and the flow rate on both sides is always the same. However, the main feature of the distributed dual electric drive assembly is that it can independently control the motor speed and torque output on both sides as needed. Therefore, the lubricating oil flow requirements of the two motors and reducers are not necessarily the same. Therefore, the speed control of the oil pump can only take into account the maximum demand side, resulting in increased energy consumption of the oil pump and increased loss of electric drive efficiency; at the same time, in order to cope with the extreme working conditions with maximum flow demand, it is necessary to select an oil pump model with larger power and displacement, which increases costs and occupies a large space. However, it is redundant and wasteful for most other working conditions.

[0040] 2. When the road is tilted left or right or turns continuously on one side, the oil level in the oil pan of the distributed dual electric drive assembly will tilt due to gravity or inertia. Since only one oil pump is arranged in the center of the oil pan, the oil suction port is located in the middle of the oil pan, and it is very easy for the oil pump to suck empty, resulting in the motor and reducer being unable to lubricate. In order to address this phenomenon, the amount of oil must be increased to ensure that the oil can still be sucked normally under large-angle conditions. However, in addition to increasing costs, this method will increase gear oil stirring losses under normal driving conditions, significantly reducing efficiency.

[0041] Based on the above problems, the present application provides a dual electric drive lubrication system, wherein a lubrication branch is provided for the same motor assembly and reducer assembly on the left and right sides, each lubrication branch corresponds to an oil suction port, and the two lubrication branches each include an oil pump, and an interconnection passage is provided between the two lubrication branches, and an adjustable flow valve is provided on the interconnection passage. The purpose of supplying oil on demand is achieved by controlling the speed of the oil pump and the opening and closing degree of the adjustable flow valve.

[0042] Figure 1 The schematic diagram of the structure of the first dual electric drive lubrication system provided in the embodiment of the present application is as follows: Figure 1 As shown, the system 10 includes a controller 11, an oil pan 12, a first lubrication branch 13, a second lubrication branch 14 and an interconnection passage 15; the oil pan 12 includes a first oil suction port 121 and a second oil suction port 122; the first lubrication branch 13 includes a first oil pump 132 and a first cooler 133 connected in sequence through a first lubrication oil passage 131; a first end of the first lubrication oil passage 131 is connected to the first oil suction port 121, and a second end is connected to the first motor reducer unit 16; the second lubrication branch 14 includes a second oil pump 142 and a second cooler 143 connected in sequence through a second lubrication oil passage 141; The first end is connected to the second oil suction port 122, and the second end is connected to the second motor reducer unit 17; the interconnection passage 15 is respectively connected to the first lubricating oil circuit 131 and the second lubricating oil circuit 141, and the first end of the interconnection passage 15 is arranged between the first cooler 133 and the second end of the first lubricating oil circuit 131; the second end of the interconnection passage 15 is arranged between the second cooler 143 and the second end of the second lubricating oil circuit 141; the controller 11 is connected to the first oil pump 132, the second oil pump 142 and the adjustable valve 151, and is used to control the opening and closing degree of the first oil pump 132, the second oil pump 142 and the adjustable valve 151 respectively.

[0043] In the above solution, the oil pan 12 is located at the bottom of the first motor reducer unit 16 and the second motor reducer unit 17 and is used to store lubricating oil.

[0044] The first oil pump 132 draws the lubricating oil from the oil pan 12 through the first oil suction port 121 , and delivers the lubricating oil to the first motor reducer unit 16 through the first lubricating oil passage 131 for lubrication.

[0045] The second oil pump 142 draws the lubricating oil from the oil pan 12 through the second oil suction port 122 and delivers the lubricating oil to the second motor reducer unit 17 through the second lubricating oil passage 141 for lubrication.

[0046] The first oil pump and the second oil pump can be gear pumps, screw pumps, vane pumps or plunger pumps, etc., and the first oil pump and the second oil pump can be the same type of oil pumps or different types of oil pumps. The types of the first oil pump and the second oil pump can be selected according to actual needs.

[0047] The first cooler 133 is used to cool the lubricating oil pumped out by the first oil pump 132, so that the first motor reducer unit 16 is lubricated by the cooled lubricating oil to control the temperature of the first motor reducer unit, effectively prevent the first motor reducer unit from overheating, and improve the power density and function of the first motor reducer unit.

[0048] The second cooler 143 is used to cool the lubricating oil pumped out by the second oil pump 142, so that the second motor reducer unit 17 is lubricated by the cooled lubricating oil to control the temperature of the second motor reducer unit 17, effectively prevent the second motor reducer unit from overheating, and improve the power density and function of the second motor reducer unit.

[0049] The adjustable valve 151 is used to adjust the opening and closing state of the interconnection passage 15, such as fully opening the interconnection passage, partially opening the interconnection passage, and closing the interconnection passage.

[0050] The controller is used to issue control instructions to the first oil pump 132, the second oil pump 142 and the adjustable valve 151 according to the vehicle status information, so as to control the opening and closing degree of the first oil pump 132, the second oil pump 142 and the adjustable valve 151 based on the control instructions.

[0051] Among them, the vehicle status information includes at least one of vehicle tilt status information, status information of the first motor reducer unit, status information of the second motor reducer unit, fault information of the first oil pump, fault information of the second oil pump, fault information of the adjustable valve, etc.

[0052] The control instructions include at least one of turning on or off the first oil pump 132, turning on or off the second oil pump 142, adjusting the speed of the first oil pump 132, adjusting the speed of the second oil pump 142, turning on or off the adjustable valve 151, and adjusting the opening and closing degree of the adjustable valve 151.

[0053] The first motor-reducer unit 16 includes a first motor and a first reducer. The first motor includes a first rotor and a first stator. The first reducer includes a plurality of gear sets and bearings.

[0054] The second motor-reducer unit 17 includes a second motor and a second reducer. The second motor includes a second rotor and a second stator. The second reducer includes a plurality of gear sets and bearings.

[0055] The first motor-reducer unit 16 and the second motor-reducer unit 17 are arranged side by side directly above the oil pan 12 or obliquely above within a certain angle range.

[0056] After lubrication of the first motor reducer unit 16 and the second motor reducer unit 17 is completed, the lubricating oil falls back into the oil pan under the action of gravity to complete the lubrication cycle.

[0057] In some embodiments, the adjustable valve 151 is in a closed state, the first oil pump 132 and the second oil pump 142 are in an open state, and the first lubrication branch 13 and the second lubrication branch 14 are connected in parallel.

[0058] In some embodiments, the adjustable valve 151 is in an open state, the first oil pump 132 is in an open state, the second oil pump 142 is in a closed state, and the lubricating oil of the first lubricating branch 13 enters the second lubricating branch 14 through the interconnecting passage 15 .

[0059] Alternatively, the adjustable valve 151 is in an open state, the first oil pump 132 is in a closed state, the second oil pump 142 is in an open state, and the lubricating oil of the second lubricating branch 14 enters the first lubricating branch 13 through the interconnecting passage 15 .

[0060] In some embodiments, the open state of the adjustable valve includes a fully open state and a partially open state.

[0061] In the embodiment of the present application, a first lubrication branch is connected to the first motor reducer unit, and a second lubrication branch is connected to the second motor reducer. Since the first lubrication branch and the second lubrication branch are each provided with a corresponding oil pump, the corresponding oil pump can supply oil according to the respective needs of the first motor reducer and the second motor reducer. Furthermore, an interconnection passage is also provided between the first lubrication branch and the second lubrication branch, and an adjustable valve capable of adjusting the degree of opening and closing is provided on the interconnection passage, so that even when only one oil pump is working, the purpose of supplying oil on demand can be achieved by adjusting the degree of opening and closing of the adjustable valve, thereby improving the lubrication performance.

[0062] Figure 2 The schematic diagram of the structure of the second dual electric drive lubrication system provided in the embodiment of the present application is as follows: Figure 2As shown, the first lubrication branch 13 also includes a first one-way valve 134; the first one-way valve 134 is arranged between the first cooler 133 and the first end of the interconnecting passage 15; the second lubrication branch 14 also includes a second one-way valve 144; the second one-way valve 144 is arranged between the second cooler 143 and the second end of the interconnecting passage 15.

[0063] To prevent the lubricating oil pumped out by the first oil pump 132 or the second oil pump 142 from flowing in reverse, a first one-way valve is arranged between the first cooler and the first end of the interconnecting passage, and a second one-way valve is arranged between the second cooler and the second end of the interconnecting passage, thereby protecting the lubrication system and improving efficiency.

[0064] In some embodiments, the first oil suction port 121 includes a first filter screen; the second oil suction port 122 includes a second filter screen; the first oil suction port 121 and the second oil suction port 122 are arranged at the bottom of the oil pan 12 and are symmetrically arranged around the center of the bottom of the oil pan 12 .

[0065] By setting a filter at the oil suction port, larger particles such as dust, metal chips, worn bearing particles, rust and other contaminants are prevented from entering the oil circuit, preventing wear of the lubrication system, maintaining the cleanliness and quality of the lubricating oil, and improving the lubrication performance.

[0066] Furthermore, since the first oil suction port 121 and the second oil suction port 122 are symmetrically arranged about the center of the oil pan bottom 12, it is ensured to a certain extent that at least one oil pump can suck the lubricating oil when the vehicle is in a tilted state. In addition, the initial oil volume stored in the oil pan is reduced, so that the gear oil stirring loss is reduced under normal driving conditions.

[0067] Optionally, considering the different vehicle structures, the first motor reducer unit 16 and the second motor reducer unit 17 may be arranged obliquely above the oil pan within a certain angle range, in which case the distance between the first oil suction port 121 and the center of the oil pan 12 is different from the distance between the second oil suction port 122 and the center of the oil pan 12. For example, the first oil suction port 121 is closer to the center of the oil pan 12, and the second oil suction port 122 is farther from the center of the oil pan 12, or the first oil suction port 121 is farther from the center of the oil pan 12, and the second oil suction port 122 is closer to the center of the oil pan 12, etc.

[0068] It should be noted that the initial oil volume is related to the distance between the first oil suction port 121 and the second oil suction port 122 and the center of the oil pan. The initial oil volume should be sufficient to ensure that at least one of the oil suction ports can absorb lubricating oil when the vehicle is at the maximum tilt angle.

[0069] Continue to see Figure 2The first lubrication branch 13 also includes a first pressure filter 135 ; the first pressure filter 135 is arranged between the first oil pump 132 and the first cooler 133 ; the second lubrication branch 14 also includes a second pressure filter 145 ; the second pressure filter 145 is arranged between the second oil pump 142 and the second cooler 143 .

[0070] Taking into account that the filter can only filter larger particles, such as dust, metal chips, worn bearing particles, rust and other contaminants, in order to further improve the quality of the lubricating oil entering the first motor reducer unit 16 and the second motor reducer unit 17, pressure filters are respectively arranged between the oil pump and the cooler of the two lubrication branches to filter the lubricating oil pumped out by the oil pump to prevent the oil circuit and small oil holes from being blocked by impurities, ensure that the oil can flow smoothly to the parts that need lubrication, and improve the lubrication performance.

[0071] Figure 3 This is a schematic diagram of the structure of the third dual electric drive lubrication system provided in the embodiment of the present application. Figure 3 As shown, the first oil suction port (including the filter), the first oil pump, the first pressure filter and the first cooler are arranged correspondingly with the second oil suction port (including the filter), the second oil pump, the second pressure filter and the second cooler in an axially symmetrical form.

[0072] Figure 4 A schematic diagram of a motor reducer unit provided in an embodiment of the present application. According to the above embodiment, the components in the first motor reducer unit 16 include a first rotor and a first stator, multiple sets of gears and bearings. The components in the second motor reducer unit 17 include a second rotor and a second stator, multiple sets of gears and bearings. Figure 4 It can be seen that different components have different shapes and positions, so the lubricating oil requirements of each component are also different.

[0073] Based on this, see Figure 5 , Figure 5 The structural diagram of the fourth dual electric drive lubrication system provided in the embodiment of the present application is as follows: Figure 5 As shown, the second end of the first lubricating oil circuit 131 includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the first motor reducer unit 16; the second end of the second lubricating oil circuit 141 includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the second motor reducer unit 17.

[0074] The embodiment of the present application takes into account the different requirements for lubricating oil required by each component in the first motor reducer unit and the second motor reducer unit, so that branches of different sizes are set corresponding to different components, so as to achieve the purpose of supplying oil to each component in the motor reducer unit on demand, thereby improving the lubrication performance on the basis of achieving energy saving.

[0075] In some embodiments, the end of each branch includes a nozzle, through which the lubricating oil is precisely sprayed onto the components that need lubrication in a spraying manner, ensuring that the lubricating oil can evenly cover the friction surface, forming a continuous oil film, reducing wear and improving efficiency.

[0076] Optionally, some gears and bearings may come into contact with the lubricating oil stored in the oil pan during operation, so that some gears and bearings are lubricated in the form of splashing of the lubricating oil.

[0077] Figure 6 A schematic diagram of the structure of a dual electric drive system provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the system 20 includes a first motor reducer unit 16, a second motor reducer unit 17 and a dual electric drive lubrication system 10. The first lubrication branch 13 of the dual electric drive lubrication system 10 is connected to the first motor reducer unit 16, and the second lubrication branch 14 of the dual electric drive lubrication system 10 is connected to the second motor reducer unit 17.

[0078] In an embodiment of the present application, the first lubrication branch of the dual electric drive lubrication system is connected to the first motor reducer unit, and the second lubrication branch of the dual electric drive lubrication system is connected to the second motor reducer unit, so that the corresponding lubrication branches can supply oil according to the respective needs of the first motor reducer and the second motor reducer, thereby improving the lubrication performance.

[0079] Figure 7 A schematic flow chart of a dual electric drive lubrication control method provided in an embodiment of the present application, the method is applied to the controller as described in the above embodiment, such as Figure 7 As shown, the method includes:

[0080] Step S701, receiving status information of a first motor reducer unit and status information of a second motor reducer unit.

[0081] Step S702, determining a first amount of lubricating oil required by the first motor reducer unit based on the status information of the first motor reducer unit; and determining a second amount of lubricating oil required by the second motor reducer unit based on the status information of the second motor reducer unit.

[0082] Step S703: generating a control strategy according to the first lubricating oil amount and the second lubricating oil amount, so as to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve through the control strategy.

[0083] During the implementation process, considering that the reducer's demand for lubricating oil is not as high as that of the motor, and when the reducer generates a lot of heat, the motor must also generate a lot of heat, so oil can be supplied only according to the state of the motor. Therefore, the state information of the first motor reducer unit and the second motor reducer unit can only include the state information of the motor.

[0084] In order to optimize the control strategy, the status information of the first motor reducer unit and the second motor reducer unit may further include status information of the reducer.

[0085] The state information of the motor includes at least one of the speed information, torque information and temperature information of the motor, wherein the speed information is collected by a speed sensor, and the temperature information is collected by a temperature sensor.

[0086] The state information of the reducer includes at least one of the temperature information, load condition, and speed information of the reducer, and is also acquired by using corresponding sensors.

[0087] On this basis, the first lubricating oil quantity required by the first motor reducer unit is determined based on the status information of the first motor reducer unit; and the second lubricating oil quantity required by the second motor reducer unit is determined based on the status information of the second motor reducer unit.

[0088] Finally, a control strategy is generated according to the first lubricating oil amount and the second lubricating oil amount, so as to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve through the control strategy.

[0089] The embodiment of the present application generates a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve. In this process, since the first lubricating oil quantity is determined based on the status information of the first motor reducer unit, and the second lubricating oil quantity is determined based on the status information of the second motor reducer unit, it is possible to supply oil on demand according to different lubricating oil quantity requirements, thereby improving lubrication performance.

[0090] In some embodiments, before generating a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity, the method also includes: receiving vehicle operating status information; the vehicle operating status information includes at least one of vehicle tilt status information, fault information of the first oil pump and fault information of the second oil pump; accordingly, generating a control strategy based on the first lubricating oil quantity and the second lubricating oil quantity includes: generating a control strategy based on the vehicle operating status information, the first lubricating oil quantity and the second lubricating oil quantity.

[0091] The working conditions of the first and second oil pumps in the dual electric drive lubrication system are different when the vehicle is in different operating conditions. For example, when the vehicle tilts to the right, the oil pan will also tilt to the right. Since the lubricating oil in the oil pan is unevenly distributed on the left and right, the left oil pump may be empty. At this time, the left oil pump will not work properly.

[0092] Furthermore, even if the vehicle does not tilt, if the oil pump fails, it still cannot suck oil normally.

[0093] Therefore, in order to further improve the accuracy of the control strategy, it is also necessary to receive vehicle operating status information, so as to obtain the vehicle operating status or the working status of the oil pump through the vehicle operating status information, and generate a control strategy based on the vehicle operating status information, the first lubricating oil quantity and the second lubricating oil quantity.

[0094] The vehicle operation status information includes at least one of vehicle tilt status information, fault information of the first oil pump, and fault information of the second oil pump. The vehicle tilt status information is acquired by a vehicle acceleration sensor, the fault information of the first oil pump is acquired by monitoring the controller of the first oil pump, and the fault information of the second oil pump is acquired by monitoring the controller of the second oil pump.

[0095] The embodiments of the present application can more accurately control the supply method of lubricating oil and improve lubrication efficiency and performance by taking into account the operating status of the vehicle and the working condition of the oil pump.

[0096] In some embodiments, a control strategy is generated according to vehicle operation status information, a first lubricating oil quantity and a second lubricating oil quantity, including: judging the working status of the first oil pump and the second oil pump according to the vehicle operation status information; the working status includes a normal state, an empty state and a fault state; if the first oil pump and the second oil pump are in a normal state, and the first lubricating oil quantity and the second lubricating oil quantity are less than a preset oil quantity threshold, the adjustable valve is fully opened and one of the first oil pump and the second oil pump is closed, and the speed of the oil pump in the open state is determined based on the first lubricating oil quantity and the second lubricating oil quantity; if the first oil pump and the second oil pump are in a normal state, and the first lubricating oil quantity or the second lubricating oil quantity is not less than the preset oil quantity threshold, the adjustable valve is closed, and the speed of the first oil pump is determined based on the first lubricating oil quantity, and the speed of the second oil pump is determined based on the second lubricating oil quantity; if the working status of one of the first oil pump and the second oil pump is in an empty state or a fault state, the oil pump in the empty state or the fault state is closed, and the speed of the oil pump in the open state and the opening and closing degree of the adjustable valve are determined based on the first lubricating oil quantity and the second lubricating oil quantity.

[0097] The preset oil volume threshold is a pre-set value, which is set according to actual conditions.

[0098] The normal state means that neither the first oil pump nor the second oil pump fails nor has any cavitation, that is, the first oil pump and the second oil pump can pump out lubricating oil normally.

[0099] The empty suction state means that the first oil pump and the second oil pump are not faulty, but the lubricating oil level is lower than the oil suction port, resulting in failure to pump out the lubricating oil normally.

[0100] The fault state refers to a fault in the first oil pump and the second oil pump, resulting in failure to normally pump out the lubricating oil even if there is no cavitation.

[0101] Exemplarily, under normal vehicle driving conditions, the motor operates at medium and low speeds, and the first motor reducer unit and the second motor reducer unit have a small demand for lubricating oil, that is, the first lubricating oil amount and the second lubricating oil amount are both less than the preset oil amount threshold. At this time, the controller controls the adjustable flow valve to be fully opened, the first oil pump is started, and the second oil pump is turned off. The flow resistance on both sides is equivalent, and the first motor reducer unit and the second motor reducer unit obtain the same amount of lubricating flow.

[0102] Alternatively, the controller controls the adjustable flow valve to be fully opened, the first oil pump is closed, and the second oil pump is started, the flow resistance on both sides is equal, and the first motor reducer unit and the second motor reducer unit obtain the same amount of lubrication flow.

[0103] Or the controller alternately controls the first oil pump or the second oil pump to start.

[0104] For example, when the vehicle is traveling at high speed or climbing a slope, the motor generates a lot of heat, and the first motor reducer unit or the second motor reducer unit has a high demand for lubricating oil, that is, the first lubricating oil amount or the second lubricating oil amount is not less than the preset oil amount threshold. If only one oil pump is running, it cannot meet the total lubrication demand of the first motor reducer unit and the second motor reducer unit. At this time, the controller controls both the first oil pump and the second oil pump to work, and completely closes the adjustable flow valve at the same time, forming two independent lubrication systems, supplying oil to the first motor reducer unit and the second motor reducer unit respectively. At the same time, the speed of the first oil pump is determined based on the first lubricating oil amount, and the speed of the second oil pump is determined based on the second lubricating oil amount, so as to control the flow rate as needed by controlling the oil pump speed.

[0105] For example, when the vehicle rolls or continuously turns on one side, and the vehicle's roll angle exceeds a certain angle threshold, the oil pump on the side higher than the ground will be empty, that is, by comparing the vehicle's tilt state information with the preset angle threshold, it is determined whether there is a situation where the oil pump on one side cannot normally pump out the lubricating oil. At this time, the controller controls the oil pump on the oil-absorbing side to work, the oil pump on the other side is turned off, and the adjustable valve is opened to supply oil to both sides. However, since the motor on the low side usually has a greater torque output and a greater demand for lubrication, the opening of the adjustable throttle valve is controlled so that the amount of lubricating oil on the low side is large and the amount of lubricating oil on the high side is small.

[0106] It should be noted that the oil pump may also fail. If the oil pump fails, the failed oil pump is turned off, and the normal oil pump and the adjustable valve are turned on to supply oil to both sides. The fault is displayed on the instrument panel to remind the user to avoid using the vehicle at high speed, high load, and large tilt, and to perform maintenance as soon as possible to prevent a single oil pump from being unable to meet the lubricating oil demand of the first motor reducer unit and the second motor reducer unit at the same time.

[0107] The vehicle operation status information may also include fault information of the adjustable valve. If the adjustable valve fails, the fault will be displayed on the instrument panel to remind the user to avoid using the vehicle at high speed, high load, or large tilt, and to carry out maintenance as soon as possible.

[0108] The embodiment of the present application executes different control strategies through analysis of the working status of the first oil pump and the second oil pump to meet the oil quantity requirements under different working conditions, achieve the purpose of on-demand oil supply, and improve lubrication performance.

[0109] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0110] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0111] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0112] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual electric drive lubrication system, characterized in that: The system includes a controller, an oil sump, a first lubrication branch, a second lubrication branch, and an interconnecting passage; The oil pan comprises a first oil suction port and a second oil suction port; The first lubrication branch includes a first oil pump and a first cooler connected in sequence through a first lubrication oil circuit; The first end of the first lubricating oil circuit is connected to the first oil suction port, and the second end is connected to the first motor reducer unit; The second lubrication branch includes a second oil pump and a second cooler connected in sequence through a second lubrication oil circuit; A first end of the second lubricating oil circuit is connected to the second oil suction port, and a second end is connected to the second motor reducer unit; The interconnection passage is connected to the first lubricating oil circuit and the second lubricating oil circuit respectively, and a first end of the interconnection passage is arranged between the first cooler and the second end of the first lubricating oil circuit; a second end of the interconnection passage is arranged between the second cooler and the second end of the second lubricating oil circuit; The controller is connected to the first oil pump, the second oil pump and the adjustable valve, and is used to control the opening and closing degrees of the first oil pump, the second oil pump and the adjustable valve respectively.

2. The system according to claim 1, characterized in that The first lubrication branch further comprises a first one-way valve; the first one-way valve is arranged between the first cooler and the first end of the interconnection passage; The second lubrication branch further includes a second one-way valve; the second one-way valve is arranged between the second cooler and the second end of the interconnecting passage.

3. The system according to claim 1, characterized in that The first lubrication branch further includes a first pressure filter; the first pressure filter is arranged between the first oil pump and the first cooler; The second lubrication branch further includes a second pressure filter; the second pressure filter is arranged between the second oil pump and the second cooler.

4. The system according to claim 1, characterized in that The first oil suction port includes a first filter screen; the second oil suction port includes a second filter screen; The first oil suction port and the second oil suction port are arranged at the bottom of the oil pan and are symmetrically arranged around the center of the bottom of the oil pan.

5. The system according to any one of claims 1 to 4, characterized in that: The second end of the first lubricating oil circuit includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the first motor reducer unit; the second end of the second lubricating oil circuit includes multiple branches with different aperture sizes, and each branch corresponds one-to-one to an element in the second motor reducer unit.

6. The system according to claim 5, characterized in that Each branch comprises a nozzle at its distal end.

7. A dual electric drive system, characterized in that: It comprises a first motor reducer unit, a second motor reducer unit and a dual electric drive lubrication system as claimed in any one of claims 1 to 6; The first lubrication branch of the dual electric drive lubrication system is connected to the first motor reducer unit, and the second lubrication branch of the dual electric drive lubrication system is connected to the second motor reducer unit.

8. A dual electric drive lubrication control method, characterized in that: The method is applied to the controller according to any one of claims 1 to 6, and the method comprises: Receiving status information of the first motor-reducer unit and status information of the second motor-reducer unit; Determine a first lubricating oil quantity required by the first motor reducer unit based on the state information of the first motor reducer unit; determine a second lubricating oil quantity required by the second motor reducer unit based on the state information of the second motor reducer unit; A control strategy is generated according to the first lubricating oil amount and the second lubricating oil amount, so as to control the opening and closing degree of the first oil pump, the second oil pump and the adjustable valve through the control strategy.

9. The method according to claim 8, characterized in that Before generating a control strategy according to the first lubricating oil amount and the second lubricating oil amount, the method further includes: receiving vehicle operation status information; the vehicle operation status information includes at least one of vehicle tilt status information, fault information of the first oil pump and fault information of the second oil pump; Accordingly, the generating a control strategy according to the first lubricating oil amount and the second lubricating oil amount includes: A control strategy is generated according to the vehicle operating state information, the first lubricating oil quantity, and the second lubricating oil quantity.

10. The method according to claim 9, characterized in that The generating of the control strategy according to the vehicle running state information, the first lubricating oil amount and the second lubricating oil amount comprises: Determine the working state of the first oil pump and the second oil pump according to the vehicle running state information; the working state includes a normal state, an empty state and a fault state; If the first oil pump and the second oil pump are in the normal state, and the first lubricating oil amount and the second lubricating oil amount are less than a preset oil amount threshold, fully opening the adjustable valve and closing one of the first oil pump and the second oil pump, and determining the rotation speed of the oil pump in the open state based on the first lubricating oil amount and the second lubricating oil amount; If the first oil pump and the second oil pump are in a normal state, and the first lubricating oil amount or the second lubricating oil amount is not less than a preset oil amount threshold, closing the adjustable valve, and determining the rotation speed of the first oil pump based on the first lubricating oil amount, and determining the rotation speed of the second oil pump based on the second lubricating oil amount; If the working state of one of the first oil pump and the second oil pump is in the cavitation state or the fault state, the oil pump in the cavitation state or the fault state is closed, and the rotation speed of the oil pump in the open state and the opening degree of the adjustable valve are determined based on the first lubricating oil amount and the second lubricating oil amount.

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