WO2025035963A1 - 润滑冷却系统及其控制方法 - Google Patents

润滑冷却系统及其控制方法 Download PDF

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Publication number
WO2025035963A1
WO2025035963A1 PCT/CN2024/101013 CN2024101013W WO2025035963A1 WO 2025035963 A1 WO2025035963 A1 WO 2025035963A1 CN 2024101013 W CN2024101013 W CN 2024101013W WO 2025035963 A1 WO2025035963 A1 WO 2025035963A1
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WO
WIPO (PCT)
Prior art keywords
oil pump
motor
control method
electric drive
temperature
Prior art date
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Pending
Application number
PCT/CN2024/101013
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English (en)
French (fr)
Inventor
金翔
余家佳
赵军伟
薛龙
唐琛
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
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Filing date
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Publication of WO2025035963A1 publication Critical patent/WO2025035963A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/02—Arrangements for conditioning of lubricants in the lubricating system by cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N2039/007—Using strainers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2250/00—Measuring
    • F16N2250/08—Temperature

Definitions

  • the present application relates to the technical field of cooling and lubrication, and in particular to a lubrication and cooling system and a control method thereof.
  • the current relevant motor cooling scheme determines the heat generation power of the current oil-cooled motor system based on the ambient temperature and the oil-cooled motor speed, oil-cooled motor torque, oil-cooled motor stator voltage and oil-cooled motor stator current under the current working conditions, thereby determining the target speed of the oil pump, which only meets the needs of the single-drive motor structure.
  • the conventional approach cannot achieve fine adjustment of the speed of the oil pumps on both sides, thereby reducing the operating efficiency of the entire system and the economy of the entire vehicle.
  • the present application provides a lubrication and cooling system and a control method thereof, so as to solve the problem of how to finely adjust the oil pump speed and improve the operating efficiency of the entire system in the case of an asymmetric oil circuit design of a dual drive motor structure.
  • An embodiment of the present application provides a lubrication and cooling system, which includes: a first circulation pipeline, including a main pipeline and multiple branches that are interconnected, at least one of the branches is connected to the first motor; a second circulation pipeline, connected to the second motor; a first oil pump, connected to the main pipeline, the first oil pump uses the lubricating oil in the oil pan to cool and lubricate the first motor and other components through the main pipeline and the branch pipeline; a second oil pump, connected to the second circulation pipeline, the second oil pump uses the lubricating oil in the oil pan to cool the second motor through the second circulation pipeline.
  • the first circulation pipeline also includes a first branch and a second branch, the first branch connects the main pipeline with the first motor; the second branch connects the main pipeline with a first bearing in the reduction box.
  • the lubrication and cooling system further comprises two groups of filtering devices, the first circulation pipeline and the second circulation pipeline are grouped and connected to a group of filtering devices, and each of the filtering devices is used to filter the lubricating oil in the oil pan.
  • the filtering device includes a coarse filter and a fine filter, and the first oil pump and the second oil pump are both located between the coarse filter and the fine filter.
  • the first circulation pipeline also includes a third branch, one end of which is communicated with the main pipeline and is located between the coarse filter and the fine filter, and the other end of the third branch is communicated with the second bearing in the reduction box.
  • An embodiment of the present application also provides a control method for a lubrication and cooling system, which is applied to control the above-mentioned lubrication and cooling system, wherein the lubrication system also includes a radiator, and the control method includes a first control method, wherein the first control method includes: respectively obtaining the heating power of the first motor and the heating power of the second motor; respectively obtaining the cooling demand flow of the first motor and the cooling demand flow of the second motor based on the heating power of the first motor and the heating power of the second motor; obtaining a first speed of the first oil pump according to the cooling demand flow and the distribution ratio of the first motor, and obtaining a second set of speeds of the second oil pump according to the cooling demand flow of the second motor; a first electric drive controller drives the first oil pump to rotate at a first speed, and a second electric drive controller drives the second oil pump to rotate at a second speed.
  • the lubrication system also includes a temperature sensor
  • the control method also includes a second control method, which includes: obtaining the temperature of the lubricating oil by the temperature sensor; when the temperature exceeds a first temperature threshold, confirming that the lubricating oil is in a high temperature state; when the temperature does not exceed the first temperature threshold, confirming that the lubricating oil is in a non-high temperature state; in the high temperature state, the first electric drive controller drives the first oil pump to rotate at a maximum speed, and the second electric drive controller drives the second oil pump to rotate at a maximum speed; in the non-high temperature state, executing according to the first control method.
  • the lubrication system also includes a temperature sensor
  • the control method also includes a third control method
  • the third control method includes: obtaining the temperature of the lubricating oil by the temperature sensor; when the temperature exceeds a first temperature threshold, confirming that the lubricating oil is in a high temperature state; when the temperature does not exceed the first temperature threshold and is higher than a second temperature threshold, confirming that the lubricating oil is in a medium temperature state, and when the temperature does not exceed the second temperature threshold, confirming that the lubricating oil is in a low temperature state; in the high temperature state, the first electric drive controller drives the first oil pump to rotate at a maximum speed, and the second electric drive controller drives the second oil pump to rotate at a maximum speed; in the medium temperature state, executing according to the first control method; in the low temperature state, the first electric drive controller drives the first oil pump to rotate at a minimum speed, and the second electric drive controller drives the second oil pump to rotate at a minimum speed.
  • the lubrication system further includes a temperature sensor
  • the control method further includes a fourth control method, which includes: obtaining the temperature of the lubricating oil by the temperature sensor; confirming that the lubricating oil is in a high temperature state when the temperature exceeds a first temperature threshold; confirming that the lubricating oil is in a medium temperature state when the temperature does not exceed the first temperature threshold and is higher than a second temperature threshold, confirming that the lubricating oil is in a medium-low temperature state when the temperature does not exceed the second temperature threshold and is higher than a third temperature threshold, and confirming that the lubricating oil is in an ultra-low temperature state when the temperature does not exceed the third temperature threshold; in the high temperature state, the first electric drive controller drives the first oil pump to rotate at a maximum speed, and the second electric drive controller drives the second oil pump to rotate at a maximum speed; in the medium temperature state, executing according to the first control method; in the medium-low temperature state, the first electric drive controller drives the first oil pump to rotate at
  • the respectively obtaining of the heating power of the first motor and the heating power of the second motor includes: obtaining the heating power of the first motor and the heating power of the second motor in real time; the first electric drive controller drives the first oil pump to rotate at a first speed, and the second electric drive controller drives the second oil pump to rotate at a second speed includes: the first electric drive controller drives the first oil pump to rotate at the first speed in real time, and the second electric drive controller drives the second oil pump to rotate at the second speed in real time.
  • the present application provides a lubrication and cooling system, which includes a first circulation pipeline, a second circulation pipeline, a first oil pump and a second oil pump,
  • the first circulation pipeline includes a main pipeline and multiple branches that are interconnected, at least one branch is connected to the first motor;
  • the second circulation pipeline is connected to the second motor;
  • the first oil pump is connected to the main pipeline, and the first oil pump cools and lubricates the first motor and other components with the lubricating oil in the oil pan through the main pipeline and the branch pipeline;
  • the second oil pump is connected to the second circulation pipeline, and the second oil pump cools the second motor with the lubricating oil in the oil pan through the second circulation pipeline.
  • each circulation pipeline is connected to an independent oil pump.
  • the oil pumping amount of the oil pump in each circulation pipeline is precisely controlled according to different needs, thereby increasing the proportion of electric drive working in the high-efficiency range, and then improving the overall efficiency of the electric drive.
  • the first circulation pipeline is branched, and the branches of the first circulation pipeline are used to actively cool and lubricate other components, which helps to extend the service life of other components and improve the operating efficiency of the entire system.
  • FIG1 is a schematic structural diagram of a lubrication and cooling system provided in an embodiment of the present application.
  • FIG2 is a schematic structural diagram of another lubrication and cooling system provided in an embodiment of the present application.
  • FIG3 is a schematic structural diagram of another lubrication and cooling system provided in an embodiment of the present application.
  • FIG4 is a schematic flow chart of a control method provided in an embodiment of the present application.
  • FIG5 is a schematic flow chart of another control method provided in an embodiment of the present application.
  • FIG6 is a schematic flow chart of another control method provided in an embodiment of the present application.
  • FIG7 is a schematic flow chart of another control method provided in an embodiment of the present application.
  • FIG8 is a flow chart of another control method provided in an embodiment of the present application.
  • 100 lubrication and cooling system; 110, first circulation pipeline; 111, main pipeline; 112, first branch; 113, second branch; 114, third branch; 120, second circulation pipeline; 130, oil pump; 131, first oil pump; 132, second oil pump; 140, motor; 141, first motor; 142, second motor; 150, oil pan; 160, filtering device; 161, coarse filter; 162, fine filter; 170, radiator; 180, electric drive controller; 181, first electric drive controller; 182, second electric drive controller; 190, reduction box; 191, first bearing; 192, second bearing.
  • first ⁇ second ⁇ are only used to distinguish different objects, and do not mean that the objects have the same or related points.
  • the directions “above”, “below”, “outside” and “inside” are all directions in normal use, and the directions “left” and “right” refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.
  • the lubrication cooling system includes a first circulation pipeline, a second circulation pipeline, a first oil pump and a second oil pump, and is applicable to the cooling and lubrication of any type of automotive electric drive assembly.
  • the lubrication cooling system can be applied to the cooling and lubrication of a family car electric drive assembly; for example, the lubrication cooling system can be applied to the cooling and lubrication of a commercial bus electric drive assembly; and its control method is the control method of the above-mentioned lubrication cooling system.
  • the following is an exemplary description of the lubrication cooling system being applicable to the cooling and lubrication of a family car dual electric drive assembly.
  • the lubrication cooling system 100 includes a first circulation pipeline 110 , a second circulation pipeline 120 , an oil pump 130 and a motor 140 .
  • the oil pump 130 includes a first oil pump 131 and a second oil pump 132
  • the motor 140 includes a first motor 141 and a second motor 142 .
  • the first circulation pipeline 110 includes a main pipeline 111 and a plurality of branches that are interconnected, at least one of which is connected to the first motor 141; the first oil pump 131 is connected to the main pipeline 111, and the first oil pump 131 cools and lubricates the first motor 141 and other components through the main pipeline 111 and the branches. Specifically, for a dual-motor electric drive assembly, two motors need to be cooled and lubricated, namely the first motor 141 and the second motor 142.
  • the first circulation pipeline 110 includes a main pipeline 111 and a plurality of branches, and the first oil pump 131 is arranged in the main pipeline 111. The rotation of the first oil pump 131 is controlled by the first electric drive controller 181 in the electric drive controller 180.
  • the rotation speed of the first oil pump 131 is related to the heat dissipation requirement of the first motor 141, and the specific calculation method is described in detail later.
  • the first oil pump 131 rotates to suck the lubricating oil in the oil pan 150 into the main line 111, and then the lubricating oil in the main line 111 is cooled through the radiator 170, and the cooled lubricating oil is transported to the corresponding cooling and lubrication position through various branches. At least one branch is connected to the first motor 141, and the lubricating oil in the main line 111 lubricates the first motor 141 through the branch, and then flows back to the oil pan 150 under the action of gravity.
  • the remaining branches can be connected to the reduction box 190 to cool and lubricate the bearings of the reduction box 190.
  • the flow of each branch is different, and the distribution ratio can be adjusted according to demand.
  • the specific distribution ratio is not limited.
  • the flow of each branch can be proportionally distributed according to the size of the cross-sectional area of the branch. If the ratio of the cross-sectional area is 4 to 1, the flow can also be roughly considered to be 4 to 1.
  • the second circulation pipeline 120 is in communication with the second motor 142, and the second oil pump 132 is connected to the second circulation pipeline 120.
  • the second oil pump 132 cools the second motor 142 by passing the lubricating oil in the oil pan 150 through the second circulation pipeline 120.
  • the cooling and lubricating method of the second circulation pipeline 120 is the same as that of the first circulation pipeline 110.
  • the second circulation pipeline 120 only needs to be in communication with the second motor 142.
  • the second electric drive controller 182 in the electric drive controller 180 controls the rotation of the second oil pump 132.
  • the lubricating oil in the oil pan 150 is sucked into the second circulation pipeline 120 through the rotation of the second oil pump 132.
  • the lubricating oil in the second circulation pipeline 120 is cooled through the radiator 170, and the cooled lubricating oil is delivered to the second motor 142 to cool the second motor 142. Then, the lubricating oil flows back to the oil pan 150 under the action of gravity.
  • the heating power of the motor 140 is related to the torque, rotational speed and efficiency of the motor 140.
  • the heating power of the first motor 141 is PQ1, where T1 is the torque of the first motor 141, n1 is the rotational speed of the first motor 141, and ⁇ 1 is the efficiency of the first motor 141.
  • the flow of the first oil pump 131 should be greater than Q1.
  • the ratio of the flow required by the first motor 141 to the flow of the main pipeline 111 in the first circulation pipeline 110 is ⁇ .
  • the speed of the first oil pump 131 should be, Vg1 is the displacement of the first oil pump 131, ⁇ 3 is the efficiency of the first oil pump 131, for example, the cooling flow demand of the first motor 141 accounts for 0.8, and the cooling and lubrication flow demand of the reduction gear box 190 accounts for 0.2, then ⁇ is 0.8, the cooling flow demand of the first motor 141 is Q1, and the cooling and lubrication flow demand of the reduction gear box 190 is Q1/4, and the speed of the first oil pump 131 should be.
  • the heat generation power of the second motor 142 is PQ2
  • T2 is the torque of the second motor 142
  • n2 is the speed of the second motor 142
  • ⁇ 2 is the efficiency of the second motor 142.
  • the cooling demand flow Q2 under the heat generation power of the second motor 142 can be calculated.
  • the second circulation pipeline 120 only needs to cool the second motor 142. According to the formula, it can be deduced that the speed of the second oil pump 132 should be, Vg2 is the displacement of the second oil pump 132, and ⁇ 4 is the efficiency of the second oil pump 132.
  • the present application provides a lubrication and cooling system, which includes a first circulation pipeline, a second circulation pipeline, a first oil pump and a second oil pump,
  • the first circulation pipeline includes a main pipeline and multiple branches that are interconnected, at least one branch is connected to the first motor;
  • the second circulation pipeline is connected to the second motor;
  • the first oil pump is connected to the main pipeline, and the first oil pump cools and lubricates the first motor and other components with the lubricating oil in the oil pan through the main pipeline and the branch pipeline;
  • the second oil pump is connected to the second circulation pipeline, and the second oil pump cools the second motor with the lubricating oil in the oil pan through the second circulation pipeline.
  • each circulation pipeline is connected to an independent oil pump.
  • the oil pumping amount of the oil pump in each circulation pipeline is precisely controlled according to different needs, thereby increasing the proportion of electric drive working in the high-efficiency range, and then improving the overall efficiency of the electric drive.
  • the first circulation pipeline is branched, and the branches of the first circulation pipeline are used to actively cool and lubricate other components, which helps to extend the service life of other components and improve the operating efficiency of the entire system.
  • the first circulation pipeline 110 further includes a first branch 112 and a second branch 113 , wherein the first branch 112 connects the main pipeline 111 with the first motor 141 ; the second branch 113 connects the main pipeline 111 with the first bearing 171 in the reduction box 190 .
  • the first circulation pipeline 110 includes a main pipeline 111, a first branch pipeline 112 and a second branch pipeline 113.
  • the first oil pump 131 sucks the lubricating oil from the oil pan 150 into the main pipeline 111, and then flows from the main pipeline 111 into the first branch pipeline 112 and the second branch pipeline 113 respectively.
  • the first branch pipeline 112 is connected to the first motor 141, and the first motor 141 is cooled by the lubricating oil in the first branch pipeline 112.
  • the second branch pipeline 113 is connected to the first bearing 171 in the reduction box 190, and the first bearing 171 in the reduction box 190 is cooled and lubricated by the second branch pipeline 113.
  • the first bearing 171 here can be understood as a single bearing or a plurality of bearings.
  • the first bearing 171 can be all bearings except the needle bearing in the reduction box 190. All bearings except the needle bearing in the reduction box 190 are actively lubricated by the second branch pipeline 113, and then flow back to the bottom of the reduction box 190 by gravity.
  • the distribution flow can be controlled according to the cross-sectional area of the first branch 112 and the second branch 113, or by adding a control valve. For example, 80% of the lubricating oil in the main branch 111 flows into the first branch 112, and 20% of the lubricating oil in the main branch 111 flows into the second branch 113.
  • the lubricating cooling system 100 further includes two groups of filtering devices 160, and the first circulation pipeline 110 and the second circulation pipeline 120 are grouped and connected to one group of filtering devices 160, and each filtering device 160 is used to filter the lubricating oil in the oil pan 150.
  • the filtering device 160 is connected to the first circulation pipeline 110, and the lubricating oil containing metal powder and impurities in the oil pan 150 enters the first circulation pipeline 110.
  • the filtering device 160 When passing through the filtering device 160, the lubricating oil containing metal powder and impurities is filtered by the filtering device 160, and then the filtered lubricating oil is passed through the first circulation pipeline 110 through each branch to cool and lubricate the first motor 141 and the first bearing 191 of the reduction box.
  • Any device or structure that can filter the lubricating oil containing metal powder and impurities meets the requirements, and the specific location of the filtering device 160 is not limited.
  • the filter device 160 includes a filter, which is composed of a cylinder, a stainless steel filter screen, a sewage discharge part, a transmission device and an electrical control part.
  • the filter device 160 includes a coarse filter 161 and a fine filter 162, and the first oil pump 131 is located between the coarse filter 161 and the fine filter 162.
  • the lubricating oil containing metal powder and impurities in the oil pan 150 enters the first circulation pipeline 110. When passing through the coarse filter 161, the coarse filter 161 can intercept and filter the impurities with larger particles.
  • the fine filter 162 can filter the lubricating oil finely and filter out fine impurities and colloids with a diameter of more than 0.001 mm, so that the filtered lubricating oil flows through the radiator 170 for heat dissipation, protects the radiator 170, and prevents the lubricating oil containing metal powder and impurities from clogging the first oil pump 131 and the radiator 170. Finally, the filtered lubricating oil is used to cool and lubricate the first motor 141 and the first bearing 191 of the reduction box through the first circulation pipeline 110. Similarly, the second circulation pipeline 120 is also connected to the same filtering device 160, which has the same function and will not be described in detail here.
  • the first circulation pipeline 110 further includes a third branch 114, one end of which is connected to the main pipeline 111 and is located between the coarse filter 161 and the fine filter 162, and the other end of the third branch 114 is connected to the second bearing 172 in the reduction box 190.
  • a third branch 114 one end of which is connected to the main pipeline 111 and is located between the coarse filter 161 and the fine filter 162, and the other end of the third branch 114 is connected to the second bearing 172 in the reduction box 190.
  • the first circulation pipeline 110 further includes the third branch 114, one end of which is located between the coarse filter 161 and the fine filter 162, and the first oil pump 131 pumps the lubricating oil from the oil pan to the oil pan.
  • the oil sucked in from 150 flows into the main pipeline 111, part of the lubricating oil flows into the third branch 114 through the coarse filter 161, and most of the remaining lubricating oil flows into the fine filter 162 through the coarse filter 161.
  • the third branch 114 is connected to the second bearing 172 in the reduction box 190, and the second bearing 172 in the reduction box 190 is cooled and lubricated through the third branch 114.
  • the second bearing 172 here can be understood as a single bearing or a plurality of bearings.
  • the second bearing 172 can be a needle bearing in the reduction box 190.
  • This embodiment provides a control method for a lubrication cooling system, and the control method is applicable to a lubrication system as shown in any one of Figures 1 to 3.
  • Figure 4 is a flow chart of a control method for a lubrication cooling system provided in an embodiment of the present application, and the control method includes a first control method, and the flow chart is as follows:
  • Step S10 respectively obtaining the heating power of the first motor and the heating power of the second motor.
  • the control system obtains the heating power PQ1 of the first motor according to the torque, speed, efficiency and other related information of the first motor, where T1 is the torque of the first motor, n1 is the speed of the first motor, and ⁇ 1 is the efficiency of the first motor.
  • the heating power PQ2 of the second motor is obtained, where T2 is the torque of the second motor, n2 is the speed of the second motor, and ⁇ 2 is the efficiency of the second motor.
  • Step S20 based on the heating power of the first motor and the heating power of the second motor, respectively obtain the cooling demand flow rate of the first motor and the cooling demand flow rate of the second motor.
  • control system can obtain the cooling demand flow Q1 under the heating power of the first motor based on the heating power PQ1 of the first motor combined with the heat dissipation power of the radiator.
  • the control system can obtain the cooling demand flow Q2 under the heating power of the first motor based on the heating power PQ2 of the second motor combined with the heat dissipation power of the radiator.
  • Step S30 obtaining a first rotational speed of the first oil pump according to the cooling demand flow and the distribution ratio of the first motor, and obtaining a second rotational speed of the second oil pump according to the cooling demand flow of the second motor.
  • the flow of the first oil pump should be greater than Q1, and the ratio of the flow required by the first motor to the flow of the main pipeline in the first circulation pipeline is ⁇ .
  • the system can obtain the speed of the first oil pump according to the formula, Vg1 is the displacement of the first oil pump, and ⁇ 3 is the efficiency of the first oil pump.
  • Vg2 is the displacement of the second oil pump 132
  • ⁇ 4 is the efficiency of the second oil pump.
  • Step S40 the first electric drive controller drives the first oil pump to rotate at a first speed, and the second electric drive controller drives the second oil pump to rotate at a second speed.
  • the first electric drive controller sends a first control instruction, and the first oil pump rotates at the first speed in response to the first control instruction.
  • the second electric drive controller sends a second control instruction, and the second oil pump rotates at the second speed in response to the second control instruction.
  • FIG. 5 is a flow chart of another control method of a lubrication cooling system provided in an embodiment of the present application, and the control method includes a second control method, and the flow chart is as follows:
  • Step S50 obtaining the temperature of the lubricating oil by a temperature sensor.
  • the number of temperature sensors can be one or more. In order to detect the temperature more accurately, multiple temperature sensors can be set.
  • the specific location of the temperature sensor is not limited. For example, it can be set in the main pipeline and between the coarse filter and the fine filter, or it can be set in the oil pan. The temperature of the lubricating oil is obtained through the temperature sensor.
  • Step S60 when the temperature exceeds the first temperature threshold, confirm that the lubricating oil is in a high temperature state; when the temperature does not exceed the first temperature threshold, confirm that the lubricating oil is in a non-high temperature state.
  • a first temperature threshold T0 is set, and the specific value can be determined according to actual conditions.
  • the first temperature threshold T0 is 80 degrees Celsius. If the lubricating oil temperature measured by the temperature sensor exceeds 80 degrees Celsius, the control system determines that the lubricating oil is in a high temperature state. If the lubricating oil temperature measured by the temperature sensor does not exceed 80 degrees Celsius, the control system determines that the lubricating oil is in a non-high temperature state.
  • Step S70 includes step S71 or step S72.
  • step S71 under high temperature state, the first electric drive controller drives the first oil pump to rotate at the maximum speed, and the second electric drive controller drives the second oil pump to rotate at the maximum speed; in step S72, under non-high temperature state, the first control method is executed.
  • the first electric drive controller sends a control instruction to the first oil pump, and the first oil pump receives the control instruction and rotates at the maximum speed.
  • the second electric drive controller sends a control instruction to the second oil pump, and the second oil pump receives the control instruction and rotates at the maximum speed, thereby accelerating the cooling of the lubricating oil and the motor.
  • steps 10, 20, 30 and 40 in the first control method are executed, and no further details are given here.
  • FIG. 6 is a flow chart of another control method of a lubrication cooling system provided in an embodiment of the present application, and the control method includes a third control method, and the flow chart is as follows:
  • Step S50 obtaining the temperature of the lubricating oil by a temperature sensor.
  • Step S80 when the temperature exceeds the first temperature threshold, confirm that the lubricating oil is in a high temperature state; when the temperature does not exceed the first temperature threshold and is higher than the second temperature threshold, confirm that the lubricating oil is in a medium temperature state; when the temperature does not exceed the second temperature threshold, confirm that the lubricating oil is in a low temperature state.
  • a first temperature threshold and a second temperature threshold are set, and the specific numerical values can be determined according to actual conditions.
  • the first temperature threshold is 80 degrees Celsius
  • the second temperature threshold is 30 degrees Celsius. If the lubricating oil temperature measured by the temperature sensor exceeds 80 degrees Celsius, the control system determines that the lubricating oil is in a high temperature state; if the lubricating oil temperature measured by the temperature sensor does not exceed 80 degrees Celsius but is higher than 30 degrees Celsius, the control system determines that the lubricating oil is in a medium temperature state; if the lubricating oil temperature measured by the temperature sensor does not exceed 30 degrees Celsius, the control system determines that the lubricating oil is in a low temperature state.
  • Step S90 includes step S91 or step S92 or step S93.
  • step S91 under high temperature conditions, the first electric drive controller drives the first oil pump to rotate at a maximum speed, and the second electric drive controller drives the second oil pump to rotate at a maximum speed; in step S92, under medium temperature conditions, the first control method is executed; in step S93, under low temperature conditions, the first electric drive controller drives the first oil pump to rotate at a minimum speed, and the second electric drive controller drives the second oil pump to rotate at a minimum speed.
  • the control method under high temperature state has been described above and will not be repeated here. Considering that the lubricating oil has a good cooling effect under low temperature state, there is no need to increase the flow rate of the lubricating oil, thereby saving energy consumption.
  • the steps 100, 200, 300 and 400 in the first control method are executed, and no further details are given here.
  • the first electric drive controller sends a control instruction to the first oil pump, and the first oil pump receives the control instruction and rotates at the minimum speed.
  • the numerical value of the minimum speed is not limited.
  • the normal temperature lubrication flow demand of the electric drive is obtained according to simulation and lubrication tests: n0 ⁇ 800rpm, that is, the minimum speed of the first oil pump is 800 revolutions per second. Similarly, the second oil pump also rotates at the minimum speed.
  • FIG. 7 is a flow chart of another control method of a lubrication cooling system provided in an embodiment of the present application, and the control method includes a fourth control method, and the flow chart is as follows:
  • Step S50 obtaining the temperature of the lubricating oil by a temperature sensor.
  • Step S100 when the temperature exceeds the first temperature threshold, confirm that the lubricating oil is in a high temperature state; when the temperature does not exceed the first temperature threshold and is higher than the second temperature threshold, confirm that the lubricating oil is in a medium temperature state; when the temperature does not exceed the second temperature threshold and is higher than the third temperature threshold, confirm that the lubricating oil is in a medium-low temperature state; when the temperature does not exceed the third temperature threshold, confirm that the lubricating oil is in an ultra-low temperature state.
  • a first temperature threshold, a second temperature threshold and a third temperature threshold are set, and the specific numerical values can be determined according to actual conditions.
  • the first temperature threshold is 80 degrees Celsius
  • the second temperature threshold is 30 degrees Celsius
  • the third temperature threshold is 0 degrees Celsius.
  • the control system determines that the lubricating oil is in a high temperature state; if the lubricating oil temperature measured by the temperature sensor does not exceed 80 degrees Celsius but is higher than 30 degrees Celsius, the control system determines that the lubricating oil is in a medium temperature state; if the lubricating oil temperature measured by the temperature sensor does not exceed 30 degrees Celsius but is higher than 0 degrees Celsius, the control system determines that the lubricating oil is in a medium-low temperature state; if the lubricating oil temperature measured by the temperature sensor does not exceed 0 degrees Celsius, the control system determines that the lubricating oil is in an ultra-low temperature state.
  • Step S110 includes step S111 or step S112 or step S113 or step S114.
  • Step S111 in a high temperature state, the first electric drive controller drives the first oil pump to rotate at the maximum speed, and the second electric drive controller drives the second oil pump to rotate at the maximum speed;
  • step S112 in a medium temperature state, the first control method is executed;
  • step S113 in a medium and low temperature state, the first electric drive controller drives the first oil pump to rotate at the minimum speed, and the second electric drive controller drives the second oil pump to rotate at the minimum speed.
  • Step S114 in an ultra-low temperature state, the first electric drive controller drives the first oil pump to rotate at the maximum speed, and the second electric drive controller drives the second oil pump to rotate at the maximum speed.
  • the control methods under high temperature and medium temperature conditions have been described above and will not be repeated here. Considering that the lubricating oil has a good cooling effect under medium and low temperature conditions, there is no need to increase the flow rate of the lubricating oil, thereby saving energy consumption.
  • the first electric drive controller sends a control instruction to the first oil pump, and the first oil pump receives the control instruction and rotates at the minimum speed.
  • the numerical value of the minimum speed is not limited.
  • the normal temperature lubrication flow demand of the electric drive is obtained according to simulation and lubrication tests: n0 ⁇ 800rpm, that is, the minimum speed of the first oil pump is 800 revolutions per second.
  • the second oil pump also rotates at the minimum speed.
  • the cooling motor defines the oil pump speed according to the maximum current I0.
  • the maximum current I0 can be corrected according to the previous calibration. I0 is set according to the controller overcurrent protection current and the long-term allowable working current of the water pump.
  • the first electric drive controller sends a control instruction to the first oil pump, and the first oil pump receives the control instruction and rotates at the maximum speed according to the maximum current I0.
  • the second electric drive controller sends a control instruction to the second oil pump, and the second oil pump receives the control instruction and rotates at the maximum speed according to the maximum current I0.
  • FIG8 is a flow chart of another control method of a lubrication and cooling system provided in an embodiment of the present application. Based on FIG4 , step S10 in FIG8 includes:
  • Step S11 obtaining the heating power of the first motor and the heating power of the second motor in real time.
  • the control system needs to obtain the heating power PQ1 of the first motor and the heating power PQ2 of the second motor in real time according to the torque, speed, efficiency and other related information of the motor.
  • Real-time here can be understood as uninterrupted acquisition, for example, acquiring data once per second, or acquiring data twice per second.
  • step S40 in FIG. 8 includes the first electric drive controller driving the first oil pump to rotate at a first speed in real time, and the second electric drive controller driving the second oil pump to rotate at a second speed in real time.
  • the real-time cooling demand flow Q1 under the heating power of the first motor and the cooling demand flow Q2 under the heating power of the second motor are obtained, so that the speed of the first oil pump and the speed of the second oil pump are obtained according to the demand flow Q1 and the demand flow Q2.
  • the first electric drive controller sends a first control instruction in real time, and the first oil pump rotates at the first speed in response to the first control instruction.
  • the second electric drive controller sends a second control instruction in real time, and the second oil pump rotates at the second speed in response to the second control instruction.

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Abstract

一种润滑冷却系统及其控制方法，涉及冷却润滑技术领域，该润滑冷却系统包括第一循环管路（110）、第二循环管路（120）、第一油泵（131）和第二油泵（132），第一循环管路（110）包括相互连通的主管路（111）和多条支路，至少一条支路与第一电机（141）连通；第二循环管路（120）与第二电机（142）连通；第一油泵（131）与主管路（111）连接，第一油泵（131）将油底壳（150）中的润滑油通过主管路（111）和支路分别对第一电机（141）以及其他部件进行冷却润滑；第二油泵（132）与第二循环管路（120）连接，第二油泵（132）将油底壳（150）中的润滑油通过第二循环管路（120）对第二电机（142）进行冷却，本润滑冷却系统精细化调整油泵转速，提高整个系统的运行效率。

Description

润滑冷却系统及其控制方法
相关申请
本申请要求于2023年08月17号申请的、申请号为202311047238.5的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及冷却润滑技术领域，尤其涉及一种润滑冷却系统及其控制方法。
 背景技术
随着新能源汽车技术的快速发展，人们对新能源汽车驱动电机的噪音要求越来越高，同时随着电机功率密度的增长，电机的散热能力要求也大大提高。当前相关电机冷却方案根据环境温度以及当前工况下的油冷电机转速、油冷电机扭矩、油冷电机定子电压和油冷电机定子电流，确定当前油冷电机系统的发热功率，从而确定油泵目标转速，仅满足单驱动电机结构的需求，对于双驱动电机结构，尤其是非对称油路设计的结构，常规做法无法做到双侧油泵转速的精细化调整，从而降低了整个系统的运行效率，降低了整车的经济性。
 发明内容
本申请提供一种润滑冷却系统及其控制方法，以解决如何在双驱动电机结构非对称油路设计的情况下，精细化调整油泵转速，提高整个系统的运行效率。
本申请实施例提供一种润滑冷却系统，该润滑冷却系统包括：第一循环管路，包括相互连通的主管路和多条支路，至少一条所述支路与第一电机连通；第二循环管路，与第二电机连通；第一油泵，与所述主管路连接，所述第一油泵将油底壳中的润滑油通过所述主管路和所述支路分别对所述第一电机以及其他部件进行冷却润滑；第二油泵，与所述第二循环管路连接，所述第二油泵将油底壳中的润滑油通过所述第二循环管路对所述第二电机进行冷却。
进一步地，所述第一循环管路还包括第一支路和第二支路，所述第一支路连通所述主管路与所述第一电机；所述第二支路连通所述主管路与减速箱中第一轴承。
进一步地，所述润滑冷却系统还包括两组过滤装置，所述第一循环管路和所述第二循环管路分组连通一组所述过滤装置，各所述过滤装置用以对所述油底壳内的润滑油过滤。
进一步地，所述过滤装置包括粗滤器和细滤器，所述第一油泵和所述第二油泵均位于所述粗滤器和所述细滤器之间。
进一步地，所述第一循环管路还包括第三支路，所述第三支路的一端与所述主管路连通，且位于所述粗滤器和所述细滤器之间，所述第三支路的另一端与减速箱中第二轴承连通。
本申请实施例还提供一种润滑冷却系统的控制方法，该控制方法应用于控制上述的润滑冷却系统，所述润滑系统还包括散热器，所述控制方法包括第一控制方法，所述第一控制方法包括：分别获取所述第一电机的发热功率和所述第二电机的发热功率；基于所述第一电机的发热功率和所述第二电机的发热功率，分别得到所述第一电机冷却需求流量和所述第二电机的冷却需求流量；根据所述第一电机的冷却需求流量以及分配比例获得所述第一油泵的第一转速，根据所述第二电机的冷却需求流量获得所述第二油泵的第二套转速；第一电驱动控制器驱动所述第一油泵按照第一转速转动，第二电驱动控制器驱动所述第二油泵按照第二转速转动。
进一步地，所述润滑系统还包括温度传感器，所述控制方法还包括第二控制方法，所述第二控制方法包括：由所述温度传感器获取所述润滑油的温度；在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值的状态下，确认所述润滑油处于非高温状态；在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述非高温状态，按照所述第一控制方法进行执行。
进一步地，所述润滑系统还包括温度传感器，所述控制方法还包括第三控制方法，所述第三控制方法包括：由所述温度传感器获取所述润滑油的温度；在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值且高于第二温度阈值的状态下，确认所述润滑油处于中温状态，在所述温度不超过第二温度阈值的状态下，确认所述润滑油处于低温状态；在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述中温状态下，按照所述第一控制方法进行执行；在所述低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最小转速转动，所述第二电驱动控制器驱动所述第二油泵按照最小转速转动。
进一步地，所述润滑系统还包括温度传感器，所述控制方法还包括第四控制方法，所述第四控制方法包括：由所述温度传感器获取所述润滑油的温度；在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值且高于第二温度阈值的状态下，确认所述润滑油处于中温状态，在所述温度不超过第二温度阈值的状态下且高于第三温度阈值的状态下，确认所述润滑油处于中低温状态，在所述温度不超过第三温度阈值的状态下，确认所述润滑油处于超低温状态；在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述中温状态下，按照所述第一控制方法进行执行；在所述中低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最小转速转动，所述第二电驱动控制器驱动所述第二油泵按照最小转速转动。在所述超低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动。
进一步地，所述分别获取所述第一电机的发热功率和所述第二电机的发热功率包括：实时获取所述第一电机的发热功率和所述第二电机的发热功率；所述第一电驱动控制器驱动所述第一油泵按照第一转速转动，第二电驱动控制器驱动所述第二油泵按照第二转速转动包括：第一电驱动控制器实时驱动所述第一油泵按照第一转速转动，第二电驱动控制器实时驱动所述第二油泵按照第二转速转动。
本申请提供一种润滑冷却系统，该润滑冷却系统包括第一循环管路、第二循环管路、第一油泵和第二油泵，第一循环管路包括相互连通的主管路和多条支路，至少一条支路与第一电机连通；第二循环管路与第二电机连通；第一油泵与主管路连接，第一油泵将油底壳中的润滑油通过主管路和支路分别对第一电机以及其他部件进行冷却润滑；第二油泵与第二循环管路连接，第二油泵将油底壳中的润滑油通过第二循环管路对第二电机进行冷却。针对双电机电驱动总成，采用两套循环管路，各循环管路连接独立的油泵，考虑到双电机电驱动总成中每个电机的冷却需求不同，且每个循环管路的冷却润滑路径也有所区别，针对需求不同，对每个循环管路中的油泵的泵油量进行精准控制，从而提高电驱动工作在高效区间的占比，进而提高电驱动综合效率，同时将第一循环管路设置分支，利用第一循环管路的分支对其他部件进行主动冷却润滑，有助于延伸其他零部件的使用寿命，提升了整个系统的运行效率。
 附图说明
图1为本申请实施例提供的一种润滑冷却系统的结构示意图；
图2为本申请实施例提供的另一种润滑冷却系统的结构示意图；
图3为本申请实施例提供的另一种润滑冷却系统的结构示意图；
图4为本申请实施例提供的一种控制方法的流程示意图；
图5为本申请实施例提供的另一种控制方法的流程示意图；
图6为本申请实施例提供的另一种控制方法的流程示意图；
图7为本申请实施例提供的另一种控制方法的流程示意图；
图8为本申请实施例提供的另一种控制方法的流程示意图。
附图标记说明
100、润滑冷却系统；110、第一循环管路；111、主管路；112、第一支路；113、第二支路；114、第三支路；120、第二循环管路；130、油泵；131、第一油泵；132、第二油泵；140、电机；141、第一电机；142、第二电机；150、油底壳；160、过滤装置；161、粗滤器；162、细滤器；170、散热器；180、电驱动控制器；181、第一电驱动控制器；182、第二电驱动控制器；190、减速箱；191、第一轴承；192、第二轴承。
 本发明的实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
在具体实施例中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，例如通过不同的具体技术特征的组合可以形成不同的实施例和技术方案。为了避免不必要的重复，本申请中各个具体技术特征的各种可能的组合方式不再另行说明。
在以下的描述中，所涉及的术语“第一\第二\ ...”仅仅是区别不同的对象，不表示各对象之间具有相同或联系之处。所涉及的方位描述“上方”、“下方”、“外”、“内”均为正常使用状态时的方位，“左”、“右”方向表示在具体对应的示意图中所示意的左右方向，可以为正常使用状态的左右方向也可以不是。
需要说明的是，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个…”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。术语“连接”在未特别说明的情况下，既包括直接连接也包括间接连接。
在具体实施方式中，该润滑冷却系统包括第一循环管路、第二循环管路、第一油泵和第二油泵，适用于任何类型汽车电驱动总成的冷却润滑，例如，该润滑冷却系统可以应用于家用轿车电驱动总成的冷却润滑；例如，该润滑冷却系统可以应用于商用客车电驱动总成的冷却润滑；其控制方法为上述润滑冷却系统的控制方法。为了便于说明，以下均以该润滑冷却系统可以应用于家用轿车双电驱动总成的冷却润滑为例进行示例性说明。
在一些实施例中，如图1所示，润滑冷却系统100包括第一循环管路110，第二循环管路120，油泵130和电机140。油泵130包括第一油泵131和第二油泵132，电机140包括第一电机141和第二电机142。
第一循环管路110包括相互连通的主管路111和多条支路，至少一条支路与第一电机141连通；第一油泵131与主管路111连接，第一油泵131将油底壳150中的润滑油通过主管路111和支路分别对第一电机141以及其他部件进行冷却润滑。具体的，针对双电机电驱动总成，需要对两个电机进行冷却润滑，即第一电机141和第二电机142。第一循环管路110包括主管路111和多条支路，在主管路111中设置第一油泵131，通过电驱动控制器180中的第一电驱动控制器181控制第一油泵131转动，具体第一油泵131的转速与第一电机141的散热需求相关，具体计算方法在后问详细描述。通过第一油泵131转动将油底壳150的润滑油吸入到主管路111内，随后经过散热器170对主管路111中的润滑油进行冷却，将冷却后的润滑油通过各个支路输送至相应的冷却润滑位置，至少存在一条支路与第一电机141连通，通过主管路111的润滑油经过支路对第一电机141润滑，随后在重力的作用下流回油底壳150，其余支路可以与减速箱190连通，对减速箱190的轴承进行冷却润滑。在此需要说明的是，各个支路的流量有所区别，可以根据需求调节分配比例，具体分配比例的方式不做限定，例如，各支路的流量可以通过支路的横截面积的大小进行比例分配，横截面积之比为4比1，则流量也可以大致认为是4比1。
第二循环管路120与第二电机142连通，第二油泵132与第二循环管路120连接，第二油泵132将油底壳150中的润滑油通过第二循环管路120对第二电机142进行冷却。具体的，第二循环管路120的冷却润滑方式与第一循环管路110的相同，第二循环管路120仅需要对第二电机142连通，通过电驱动控制器180中的第二电驱动控制器182控制第二油泵132转动，通过第二油泵132转动将油底壳150的润滑油吸入到第二循环管路120内，随后经过散热器170对第二循环管路120中的润滑油进行冷却，将冷却后的润滑输送至第二电机142，对第二电机142进行冷却，随后在重力的作用下流回油底壳150。
下文就第一油泵131和第二油泵132的转速大小进行详细说明，首先，电机140的发热功率与电机140的扭矩、转速以及效率相关，第一电机141的发热功率为PQ1，，其中T1为第一电机141的扭矩，n1为第一电机141的转速，η1为第一电机141的效率。得知第一电机141的发热功率后，基于散热器170的散热功率，可以计算出第一电机141发热功率下的冷却需求流量Q1，进一步考虑到第一油泵131提供的流量需要满足对第一电机141和减速箱190的冷却润滑，因此第一油泵131的流量应当大于Q1，将第一电机141需求的流量占第一循环管路110中主管路111的流量的比例为δ，根据公式可以推算出，第一油泵131的转速应当为，Vg1为第一油泵131排量，η3为第一油泵131的效率，例如，第一电机141冷却流量需求量占比0.8，减速箱190冷却润滑流量需求量占比0.2，则δ为0.8，第一电机141冷却流量需求量为Q1，则减速箱190冷却润滑流量需求量为Q1/4，第一油泵131的转速应当。同理，第二电机142的发热功率为PQ2，，T2为第二电机142的扭矩，n2为第二电机142的转速，η2为第二电机142的效率。基于散热器170的散热功率，可以计算出第二电机142发热功率下的冷却需求流量Q2，第二循环管路120仅需要对第二电机142进行冷却，根据公式可以推算出，第二油泵132的转速应当为，Vg2为第二油泵132排量，η4为第二油泵132的效率。
本申请提供一种润滑冷却系统，该润滑冷却系统包括第一循环管路、第二循环管路、第一油泵和第二油泵，第一循环管路包括相互连通的主管路和多条支路，至少一条支路与第一电机连通；第二循环管路与第二电机连通；第一油泵与主管路连接，第一油泵将油底壳中的润滑油通过主管路和支路分别对第一电机以及其他部件进行冷却润滑；第二油泵与第二循环管路连接，第二油泵将油底壳中的润滑油通过第二循环管路对第二电机进行冷却。针对双电机电驱动总成，采用两套循环管路，各循环管路连接独立的油泵，考虑到双电机电驱动总成中每个电机的冷却需求不同，且每个循环管路的冷却润滑路径也有所区别，针对需求不同，对每个循环管路中的油泵的泵油量进行精准控制，从而提高电驱动工作在高效区间的占比，进而提高电驱动综合效率，同时将第一循环管路设置分支，利用第一循环管路的分支对其他部件进行主动冷却润滑，有助于延伸其他零部件的使用寿命，提升了整个系统的运行效率。
在一些实施例中，如图1所示，第一循环管路110还包括第一支路112和第二支路113，第一支路112连通主管路111与第一电机141；第二支路113连通主管路111与减速箱190中第一轴承171。具体的，第一循环管路110包括主管路111，第一支路112和第二支路113，第一油泵131将润滑油从油底壳150中吸入流进主管路111，随后从主管路111分别流入第一支路112和第二支路113，第一支路112与第一电机141连通，通过第一支路112的润滑油对第一电机141进行冷却，第二支路113与减速箱190中第一轴承171连通，通过第二支路113对减速箱190中第一轴承171进行冷却润滑，此处的第一轴承171可以理解为单个轴承，也可以理解为多个数量的轴承，例如，第一轴承171可以为除去减速箱190中滚针轴承以外的所有轴承，通过第二支路113对减速箱190中除滚针轴承以外的所有轴承进行主动润滑，随后通过重力作用回流到减速箱190的底部。第一支路112和第二支路113中流量的具体分配比例不做限定，可以根据第一支路112和第二支路113的横截面积控制分配流量，或者通过增加控制阀来控制分配流量，例如，主管路111中80%的润滑油流入第一支路112，主管路111中20%的润滑油流入第二支路113。
在一些实施例中，如图2所示，为了减少润滑油中的金属粉末和杂质，润滑冷却系统100还包括两组过滤装置160，第一循环管路110和第二循环管路120分组连通一组过滤装置160，各过滤装置160用以对油底壳150内的润滑油过滤。具体的，在第一循环管路110上连通过滤装置160，油底壳150中含有金属粉末和杂质的润滑油进入第一循环管路110，在经过过滤装置160时，利用过滤装置160将含有金属粉末和杂质的润滑油进行过滤，随后通过第一循环管路110将过滤之后的润滑油经过各支路对第一电机141以及减速箱第一轴承191进行冷却润滑。任何能够对含有金属粉末和杂质的润滑油进行过滤的装置或者结构均符合要求，同时过滤装置160具体设置位置也不做限定。示例性的，过滤装置160包括过滤器，过滤器由筒体、不锈钢滤网、排污部分、传动装置及电气控制部分组成。含有金属粉末和杂质的润滑油经过过滤器滤网的滤筒后，其杂质被阻挡，当需要清洗时，只要将可拆卸的滤筒取出，处理后重新装入即可，操作维护较为方便。示例性的，为了进一步保证过滤效果，避免金属粉末和杂质对相关装置造成损伤，过滤装置160包括粗滤器161和细滤器162，第一油泵131位于粗滤器161和细滤器162之间。油底壳150中含有金属粉末和杂质的润滑油进入第一循环管路110，经过粗滤器161时，粗滤器161能够截留过滤加大颗粒的杂质，随后润滑油经过第一油泵131和细滤器162，细滤器162能够对润滑油进行细密过滤，可以滤掉直径在0.001毫米以上的细小杂质和胶质，从而使过滤后的润滑油流经散热器170进行散热，对散热器170进行保护，避免含有金属粉末和杂质的润滑油堵塞第一油泵131和散热器170。最终通过第一循环管路110将过滤之后的润滑油对第一电机141以及减速箱第一轴承191进行冷却润滑。同理，第二循环管路120上也连通相同的过滤装置160，其作用相同，在此不多做赘述。
在一些实施例中，如图3所示，第一循环管路110还包括第三支路114，第三支路114的一端与主管路111连通，且位于粗滤器161和细滤器162之间，第三支路114的另一端与减速箱190中第二轴承172连通。具体的，考虑到一些零部件对润滑油的品质要求高，润滑油中存在杂质可能造成零部件的磨损，一些零部件对润滑油的品质要求一般，细微的杂质不会对零部件造成影响，为了更好提升效率，对于一些零部件经过粗滤器161过滤后即可进行冷却润滑，因此，第一循环管路110还包括第三支路114，第三支路114的一端位于粗滤器161和细滤器162之间，第一油泵131将润滑油从油底壳150中吸入流进主管路111，部分润滑油经过粗滤器161流入第三支路114，剩余大部分润滑油经过粗滤器161流入细滤器162，第三支路114与减速箱190中第二轴承172连通，通过第三支路114对减速箱190中第二轴承172进行冷却润滑，此处的第二轴承172可以理解为单个轴承，也可以理解为多个数量的轴承，例如，第二轴承172可以为减速箱190中滚针轴承。
本实施例提供一种润滑冷却系统的控制方法，该控制方法适用于如图1至图3中任意一幅图所示的润滑系统。请参阅图4，图4为本申请实施例提供的一种润滑冷却系统的控制方法的流程示意图，该控制方法包括第一控制方法，其流程为：
步骤S10，分别获取第一电机的发热功率和第二电机的发热功率。
具体的，控制系统根据第一电机的扭矩、转速以及效率等相关信息，得到第一电机的发热功率PQ1，，其中T1为第一电机的扭矩，n1为第一电机的转速，η1为第一电机的效率。根据第二电机的扭矩、转速以及效率等相关信息，得到第二电机的发热功率PQ2，，T2为第二电机的扭矩，n2为第二电机的转速，η2为第二电机的效率。
步骤S20，基于第一电机的发热功率和第二电机的发热功率，分别得到第一电机冷却需求流量和第二电机的冷却需求流量。
具体的，控制系统根据第一电机的发热功率PQ1，结合散热器的散热功率，能够得到第一电机发热功率下的冷却需求流量Q1，控制系统根据第二电机的发热功率PQ2，结合散热器的散热功率，能够得到第一电机发热功率下的冷却需求流量Q2。
步骤S30，根据第一电机的冷却需求流量以及分配比例获得第一油泵的第一转速，根据第二电机的冷却需求流量获得第二油泵的第二套转速。
具体的，在得到第一电机发热功率下的冷却需求流量Q1后，进一步考虑到第一油泵提供的流量需要满足对第一电机和减速箱的冷却润滑，因此第一油泵的流量应当大于Q1，将第一电机需求的流量占第一循环管路中主管路的流量的比例为δ，系统根据公式可以得到第一油泵的转速应当，Vg1为第一油泵排量，η3为第一油泵的效率。在得到第二电机发热功率下的冷却需求流量Q2后，系统根据公式可以得到第二油泵的转速应当，Vg2为第二油泵132排量，η4为第二油泵的效率。
步骤S40，第一电驱动控制器驱动第一油泵按照第一转速转动，第二电驱动控制器驱动第二油泵按照第二转速转动。
具体的，在控制系统得到第一油泵的转速和第二油泵的转速后，第一电驱动控制器发送第一控制指令，第一油泵响应于第一控制指令按照第一转速转动，第二电驱动控制器发送第二控制指令，第二油泵响应于第二控制指令按照第二转速转动。
在一些实施例中，如图5所示，图5为本申请实施例提供的另一种润滑冷却系统的控制方法的流程示意图，该控制方法包括第二控制方法，其流程为：
步骤S50，由温度传感器获取润滑油的温度。
具体的，温度传感器的数量可以为1个也可以为多个，为了检测温度更加准确可以设置多个温度传感器，温度传感器的具体位置不做限定，例如，可以设置在主管道内，且位于粗滤器和细滤器之间，也可以设置在油底壳内。通过温度传感器获取润滑油的温度。
步骤S60，在温度超过第一温度阈值的状态下，确认润滑油处于高温状态；在温度不超过第一温度阈值的状态下，确认润滑油处于非高温状态。
具体的，设定第一温度阈值T0，具体数值大小可以根据实际情况而定，例如，第一温度阈值为T0为80摄氏度，温度传感器所测得润滑油温度超过80摄氏度，则控制系统判断润滑油处于高温状态，温度传感器所测得润滑油温度不超过80摄氏度，则控制系统判断润滑油处于非高温状态。
步骤S70包括步骤S71或者步骤S72，步骤S71，在高温状态下，第一电驱动控制器驱动第一油泵按照最大转速转动，第二电驱动控制器驱动第二油泵按照最大转速转动；步骤S72，在非高温状态，按照第一控制方法进行执行。
具体的，考虑到润滑油处于高温的状态下，无法有效对第一电机、第二电机和减速箱的轴承等相关零部件进行冷却，因此需要加快润滑油自身的冷却，
在控制系统判断润滑油处于高温状态下，第一电驱动控制器给第一油泵发送控制指令，第一油泵接收控制指令按照最大转速转动，同理，第二电驱动控制器给第二油泵发送控制指令，第二油泵接收控制指令按照最大转速转动，从而加快润滑油降温以及电机的降温。在非高温状态，按照第一控制方法中步骤10、步骤20、步骤30和步骤40执行，在此不多做赘述。
在一些实施例中，如图6所示，图6为本申请实施例提供的另一种润滑冷却系统的控制方法的流程示意图，该控制方法包括第三控制方法，其流程为：
步骤S50，由温度传感器获取润滑油的温度。
具体的前文已经描述在此不再赘述。
步骤S80，在温度超过第一温度阈值的状态下，确认润滑油处于高温状态；在温度不超过第一温度阈值且高于第二温度阈值的状态下，确认润滑油处于中温状态，在温度不超过第二温度阈值的状态下，确认润滑油处于低温状态。
具体的，设定第一温度阈值和第二温度阈值，具体数值大小可以根据实际情况而定，例如，第一温度阈值为80摄氏度，第二温度阈值为30摄氏度，温度传感器所测得润滑油温度超过80摄氏度，则控制系统判断润滑油处于高温状态；温度传感器所测得润滑油温度不超过80摄氏度但高于30摄氏度，则控制系统判断润滑油处于中温状态，温度传感器所测得润滑油温度不超过30摄氏度，则控制系统判断润滑油处于低温状态。
步骤S90包括步骤S91或者步骤S92或者步骤S93，步骤S91，在高温状态下，第一电驱动控制器驱动第一油泵按照最大转速转动，第二电驱动控制器驱动第二油泵按照最大转速转动；步骤S92，在中温状态下，按照第一控制方法进行执行；步骤S93，在低温状态下，第一电驱动控制器驱动第一油泵按照最小转速转动，第二电驱动控制器驱动第二油泵按照最小转速转动。
具体的，对于高温状态下的控制方法，前文已经描述，在此不再赘述。考虑到润滑油在低温状态下，具有良好的冷却效果，因此不需要增加润滑油的流量，从而节省能量的消耗，在中温状态下，按照第一控制方法中步骤100、步骤200、步骤300和步骤400执行，在此不多做赘述。在低温状态下，第一电驱动控制器给第一油泵发送控制指令，第一油泵接收控制指令按照最小转速转动，最小转速的数值大小不做限定，例如，电驱动的常温润滑流量需求根据仿真及润滑试验求得：n0≥800rpm，即第一油泵的最小转速为800转每秒。同理，第二油泵也按照最小转速转动。
在一些实施例中，如图7所示，图7为本申请实施例提供的另一种润滑冷却系统的控制方法的流程示意图，该控制方法包括第四控制方法，其流程为：
步骤S50，由温度传感器获取润滑油的温度。
具体的前文已经描述在此不再赘述。
步骤S100，在温度超过第一温度阈值的状态下，确认润滑油处于高温状态；在温度不超过第一温度阈值且高于第二温度阈值的状态下，确认润滑油处于中温状态，在温度不超过第二温度阈值的状态下且高于第三温度阈值的状态下，确认润滑油处于中低温状态，在温度不超过第三温度阈值的状态下，确认润滑油处于超低温状态。
具体的，设定第一温度阈值、第二温度阈值和第三温度阈值，具体数值大小可以根据实际情况而定，例如，第一温度阈值为80摄氏度，第二温度阈值为30摄氏度，第三温度阈值为0摄氏度，温度传感器所测得润滑油温度超过80摄氏度，则控制系统判断润滑油处于高温状态；温度传感器所测得润滑油温度不超过80摄氏度但高于30摄氏度，则控制系统判断润滑油处于中温状态，温度传感器所测得润滑油温度不超过30摄氏度但高于0摄氏度，则控制系统判断润滑油处于中低温状态，温度传感器所测得润滑油温度不超过0摄氏度，则控制系统判断润滑油处于超低温状态。
步骤S110包括步骤S111或者步骤S112或者步骤S113或者步骤S114，步骤S111，在高温状态下，第一电驱动控制器驱动第一油泵按照最大转速转动，第二电驱动控制器驱动第二油泵按照最大转速转动；步骤S112，在中温状态下，按照第一控制方法进行执行；步骤S113，在中低温状态下，第一电驱动控制器驱动第一油泵按照最小转速转动，第二电驱动控制器驱动第二油泵按照最小转速转动。步骤S114，在超低温状态下，第一电驱动控制器驱动第一油泵按照最大转速转动，第二电驱动控制器驱动第二油泵按照最大转速转动。
具体的，对于高温状态和中温状态下的控制方法，前文已经描述，在此不再赘述。考虑到润滑油在中低温状态下，具有良好的冷却效果，因此不需要增加润滑油的流量，从而节省能量的消耗，在中低温状态下，第一电驱动控制器给第一油泵发送控制指令，第一油泵接收控制指令按照最小转速转动，最小转速的数值大小不做限定，例如，电驱动的常温润滑流量需求根据仿真及润滑试验求得：n0≥800rpm，即第一油泵的最小转速为800转每秒。同理，第二油泵也按照最小转速转动。对于超低温状态下，润滑油粘度随着油温下降逐渐增大，电机负载逐渐增大，此时冷却电机按照最大电流I0定义油泵转速，最大电流I0可以根据前期的标定进行修正，I0根据控制器过流保护电流及水泵长时间许用工作电流设定。在超低温状态下，第一电驱动控制器给第一油泵发送控制指令，第一油泵接收控制指令按照最大电流I0进行最大转速转动，同理，第二电驱动控制器给第二油泵发送控制指令，第二油泵接收控制指令按照最大电流I0进行最大转速转动。
在一些实施例中，图8为本申请实施例提供的另一种润滑冷却系统的控制方法的流程示意图，基于图4，图8中的步骤S10包括：
步骤S11，实时获取第一电机的发热功率和第二电机的发热功率。
具体的，为了提高第一电机和第二电机的冷却效果，需要实时调整第一油泵和第二油泵的转速，因此控制系统需要实时根据电机的扭矩、转速以及效率等相关信息，得到第一电机的发热功率PQ1以及第二电机的发热功率PQ2。此处的实时可以理解为不间断的获取，例如，每秒获取一次数据，或者每秒获取两次数据。
基于图4，图8中的步骤S40包括第一电驱动控制器实时驱动第一油泵按照第一转速转动，第二电驱动控制器实时驱动第二油泵按照第二转速转动。
具体的，基于实时调整的第一电机的发热功率PQ1以及第二电机的发热功率PQ2，得到实时的第一电机发热功率下的冷却需求流量Q1和第二电机发热功率下的冷却需求流量Q2，从而根据需求流量Q1和需求流量Q2得到第一油泵的转速和第二油泵的转速，在控制系统得到第一油泵的转速和第二油泵的转速后，第一电驱动控制器实时发送第一控制指令，第一油泵响应于第一控制指令按照第一转速转动，第二电驱动控制器实时发送第二控制指令，第二油泵响应于第二控制指令按照第二转速转动。
以上所述，仅为本申请的较佳实施例而已，并非用于限定本申请的保护范围。

Claims (10)

  1. 一种润滑冷却系统，其中，所述系统包括：
    第一循环管路，包括相互连通的主管路和多条支路，至少一条所述支路与第一电机连通；
    第二循环管路，与第二电机连通；
    第一油泵，与所述主管路连接，所述第一油泵将油底壳中的润滑油通过所述主管路和所述支路分别对所述第一电机以及其他部件进行冷却润滑；
    第二油泵，与所述第二循环管路连接，所述第二油泵将油底壳中的润滑油通过所述第二循环管路对所述第二电机进行冷却。
  2. 根据权利要求1所述的润滑冷却系统，其中，所述第一循环管路还包括第一支路和第二支路，所述第一支路连通所述主管路与所述第一电机；所述第二支路连通所述主管路与减速箱中第一轴承。
  3. 根据权利要求1或2所述的润滑冷却系统，其中，所述润滑冷却系统还包括两组过滤装置，所述第一循环管路和所述第二循环管路分组连通一组所述过滤装置，各所述过滤装置用以对所述油底壳内的润滑油过滤。
  4. 根据权利要求3所述的润滑冷却系统，其中，所述过滤装置包括粗滤器和细滤器，所述第一油泵和所述第二油泵均位于所述粗滤器和所述细滤器之间。
  5. 根据权利要求4所述的润滑冷却系统，其中，所述第一循环管路还包括第三支路，所述第三支路的一端与所述主管路连通，且位于所述粗滤器和所述细滤器之间，所述第三支路的另一端与减速箱中第二轴承连通。
  6. 一种润滑冷却系统的控制方法，其中，所述控制方法应用于控制如权利要求1至5中任一项所述的润滑冷却系统，所述润滑系统还包括散热器，所述控制方法包括第一控制方法，所述第一控制方法包括：
    分别获取所述第一电机的发热功率和所述第二电机的发热功率；
    基于所述第一电机的发热功率和所述第二电机的发热功率，分别得到所述第一电机冷却需求流量和所述第二电机的冷却需求流量；
    根据所述第一电机的冷却需求流量以及分配比例获得所述第一油泵的第一转速，根据所述第二电机的冷却需求流量获得所述第二油泵的第二套转速；
    第一电驱动控制器驱动所述第一油泵按照第一转速转动，第二电驱动控制器驱动所述第二油泵按照第二转速转动。
  7. 根据权利要求6所述的控制方法，其中，所述润滑系统还包括温度传感器，所述控制方法还包括第二控制方法，所述第二控制方法包括：
    由所述温度传感器获取所述润滑油的温度；
    在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值的状态下，确认所述润滑油处于非高温状态；
    在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述非高温状态，按照所述第一控制方法进行执行。
  8. 根据权利要求6所述的控制方法，其中，所述润滑系统还包括温度传感器，所述控制方法还包括第三控制方法，所述第三控制方法包括：
    由所述温度传感器获取所述润滑油的温度；
    在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值且高于第二温度阈值的状态下，确认所述润滑油处于中温状态，在所述温度不超过第二温度阈值的状态下，确认所述润滑油处于低温状态；
    在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述中温状态下，按照所述第一控制方法进行执行；在所述低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最小转速转动，所述第二电驱动控制器驱动所述第二油泵按照最小转速转动。
  9. 根据权利要求6所述的控制方法，其中，所述润滑系统还包括温度传感器，所述控制方法还包括第四控制方法，所述第四控制方法包括：
    由所述温度传感器获取所述润滑油的温度；
    在所述温度超过第一温度阈值的状态下，确认所述润滑油处于高温状态；在所述温度不超过所述第一温度阈值且高于第二温度阈值的状态下，确认所述润滑油处于中温状态，在所述温度不超过第二温度阈值的状态下且高于第三温度阈值的状态下，确认所述润滑油处于中低温状态，在所述温度不超过第三温度阈值的状态下，确认所述润滑油处于超低温状态；
    在所述高温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动；在所述中温状态下，按照所述第一控制方法进行执行；在所述中低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最小转速转动，所述第二电驱动控制器驱动所述第二油泵按照最小转速转动；在所述超低温状态下，所述第一电驱动控制器驱动所述第一油泵按照最大转速转动，所述第二电驱动控制器驱动所述第二油泵按照最大转速转动。
  10. 根据权利要求6所述的控制方法，其中，所述分别获取所述第一电机的发热功率和所述第二电机的发热功率包括：
    实时获取所述第一电机的发热功率和所述第二电机的发热功率；
    所述第一电驱动控制器驱动所述第一油泵按照第一转速转动，第二电驱动控制器驱动所述第二油泵按照第二转速转动包括：
    第一电驱动控制器实时驱动所述第一油泵按照第一转速转动，第二电驱动控制器实时驱动所述第二油泵按照第二转速转动。
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