Cooling and lubrication system, vehicle, and control method

Abstract

An embodiment of the present application provides a cooling and lubrication system, a vehicle, and a control method thereof, wherein the cooling and lubrication system includes a coolant main channel, an electric drive system, and a coolant sub-channel. The electric drive system includes a generator, a first drive motor, and a first reduction gearbox; the coolant sub-channel is connected to the coolant main channel, and the coolant sub-channel includes a first sub-channel having a first branch and a second branch, and the first branch and the second branch are both connected to the coolant main channel. The coolant from the coolant main channel can be transported to the generator and the drive motor through the first branch to cool and lubricate the generator and the drive motor, and transported to the first reduction gearbox through the second branch to cool and lubricate the first reduction gearbox. The cooling and lubrication system of the embodiment of the present application has a good cooling and lubrication effect.

Description

Technical Field

[0001] The present application relates to the automotive field, and in particular to a cooling and lubrication system, a vehicle, and a control method. Background Art

[0002] As one of the auxiliary systems, the cooling and lubrication system is one of the main technologies of the entire system and is also the key to the stable operation of the entire system. In the related art, the cooling and lubrication system has the problem of poor cooling and lubrication effect. Summary of the Invention

[0003] In view of this, embodiments of the present application hope to provide a cooling and lubrication system, a vehicle, and a control method with better cooling and lubrication effects.

[0004] To achieve the above objectives, an embodiment of the present application provides a cooling and lubrication system, comprising:

[0005] Coolant main channel;

[0006] An electric drive system, comprising a generator, a first drive motor and a first reduction gearbox;

[0007] A cooling liquid sub-channel is connected to the cooling liquid main channel, and the cooling liquid sub-channel includes a first sub-channel having a first branch and a second branch. The first branch and the second branch are both connected to the cooling liquid main channel. The cooling liquid from the cooling liquid main channel can be transported to the generator and the drive motor through the first branch to cool and lubricate the generator and the drive motor, and can be transported to the first reduction gearbox through the second branch to cool and lubricate the first reduction gearbox.

[0008] In one embodiment, the electric drive system includes a second drive motor and a second reduction gearbox;

[0009] The cooling liquid sub-channel includes a second sub-channel connected in parallel with the first sub-channel. The cooling liquid from the cooling liquid main channel can be transported to the second drive motor and the second reduction gearbox through the second sub-channel to cool and lubricate the second drive motor and the second reduction gearbox.

[0010] In one embodiment, the cooling and lubrication system includes a regulating valve, and the coolant main channel is connected to the first sub-channel and the second sub-channel through the regulating valve.

[0011] In one embodiment, the regulating valve is a proportional valve.

[0012] In one embodiment, the first sub-channel includes a switch valve, and the switch valve is arranged on the first branch.

[0013] In one embodiment, the cooling and lubrication system includes a fan assembly, and the fan assembly is used to cool the electric drive system.

[0014] In one embodiment, the cooling and lubrication system includes an MTCU and at least one temperature sensor signal-connected to the MTCU.

[0015] In one embodiment, the temperature sensor is signal-connected to the generator.

[0016] In one embodiment, the temperature sensor is signal-connected to the first drive motor.

[0017] In one embodiment, the temperature sensor is signal-connected to the second drive motor.

[0018] In one embodiment, the temperature sensor is signal-connected to the main coolant channel.

[0019] In one embodiment, the coolant main channel includes an oil pan, a cooling motor, a filter, an oil pump and a radiator. The oil inlet of the filter is connected to the oil pan, and the oil outlet of the filter is connected to the oil pump. The cooling motor drives the oil pump to deliver the coolant to the coolant sub-channel through the radiator.

[0020] An embodiment of the present application also provides a vehicle comprising any one of the cooling and lubrication systems described above.

[0021] An embodiment of the present application further provides a control method for a cooling and lubrication system, the cooling and lubrication system comprising an electric drive system, a main coolant channel, and a first sub-channel and a second sub-channel arranged in parallel, the first sub-channel and the second sub-channel both being in communication with the main coolant channel, the electric drive system comprising a generator, a first drive motor, a first reduction gearbox, a second drive motor, and a second reduction gearbox, the coolant from the main coolant channel being able to be delivered to the generator, the drive motor, and the first reduction gearbox via the first sub-channel and to cool and lubricate the generator, the drive motor, and the first reduction gearbox, the coolant from the main coolant channel being able to be delivered to the second drive motor and the second reduction gearbox via the second sub-channel and to cool and lubricate the second drive motor and the second reduction gearbox, the control method comprising:

[0022] The vehicle is powered on;

[0023] Activate cooling lubrication mode;

[0024] Obtaining the coolant flow required by each component of the electric drive system;

[0025] Get the minimum coolant flow Q of the cooling and lubrication systemmin ;

[0026] Determine whether the coolant flow required by the generator or the first drive motor is greater than Q min ;

[0027] According to the determination result, the control parameters of the cooling and lubrication system are obtained.

[0028] In one embodiment, obtaining the coolant flow required by each component of the electric drive system includes:

[0029] The coolant flow rate Q1 required by the generator, the coolant flow rate Q2 required by the first drive motor, the coolant flow rate Q3 required by the first reduction gearbox, the coolant flow rate Q4 required by the second drive motor, and the coolant flow rate Q5 required by the second reduction gearbox are obtained.

[0030] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system includes:

[0031] According to the temperatures of the generator, the first drive motor, the first reducer, the second drive motor and the second reducer, the coolant flow rate Q1′ required by the generator, the coolant flow rate Q2′ required by the first drive motor, the coolant flow rate Q3′ required by the first reducer, the coolant flow rate Q4′ required by the second drive motor and the coolant flow rate Q5′ required by the second reducer are obtained, then Q1= Q1′, Q2= Q2′, Q3= Q3′, Q4= Q4′, Q5= Q5′.

[0032] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system includes:

[0033] According to the temperature difference between the generator and the first reduction gearbox, the temperature difference between the first drive motor and the first reduction gearbox, and the temperature difference between the second drive motor and the second reduction gearbox, the coolant flow rate Q1″ required by the generator, the coolant flow rate Q2″ required by the first drive motor, the coolant flow rate Q3″ required by the first reduction gearbox, the coolant flow rate Q4″ required by the second drive motor, and the coolant flow rate Q5″ required by the second reduction gearbox are obtained, then Q1= Q1″, Q2= Q2″, Q3= Q3″, Q4= Q4″, Q5= Q5″.

[0034] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system includes:

[0035] If the first sub-channel and the second sub-channel are both connected to the coolant main channel, then Q1=max(Q1′, Q1″), Q2=max(Q2′, Q2″), Q3=max(Q3′, Q3″), Q4=max(Q4′, Q4″), Q5=max(Q5′, Q5″).

[0036] In one embodiment, the minimum coolant flow Q is obtained min methods, including:

[0037] According to the speed n1 of the generator, the speed n2 of the first drive motor, the speed n3 of the second drive motor and the minimum coolant flow Q3 required by the first reduction gearbox min and the minimum coolant flow required for the second reduction gearbox Q5 min , get the minimum coolant flow Q min .

[0038] In one embodiment, the minimum coolant flow Q is obtained according to the rotation speed n1 of the generator, the rotation speed n2 of the first drive motor and the rotation speed n3 of the second drive motor. min ,include:

[0039] If n1>0, or n2>0, and n3=0, then Q min =Q3 min ;

[0040] If n1=0, n2=0, and n3>0, then Q min =Q5 min ;

[0041] If n1>0, n2>0, and n3>0, then Q min =max(Q3 min , Q5 min ).

[0042] In one embodiment, according to n1, n2, n3 and Q3 min and Q5 min , get the minimum coolant flow Q min Before the steps, also include:

[0043] According to the temperature of the first reduction gearbox and the second reduction gearbox, obtain Q3 min and Q5 min .

[0044] In one embodiment, if a trigger condition of a minimum coolant flow rate is met, the control parameter satisfies the minimum coolant flow rate, and the trigger condition includes:

[0045] Any one of n1, n2 and n3 is greater than the first preset speed N1, and after being greater than N1, is not less than the second preset speed N2 for a first preset time t1; and / or,

[0046] Safety flow Q safe Activate; and / or,

[0047] If the vehicle is powered on for a second preset time t2, the coolant temperature is greater than the first preset temperature T1; and / or,

[0048] If the vehicle is in the Ready state for a third preset time t3, the coolant temperature is lower than the second preset temperature T2.

[0049] In one embodiment, the control parameters include:

[0050] The coolant flow rate Q required by the cooling and lubrication system; and / or,

[0051] The opening degree k1 of the switch valve; and / or,

[0052] The regulating valve corresponds to an opening degree k2 of the first sub-channel and an opening degree k3 of the second sub-channel.

[0053] In one embodiment, the control method further includes:

[0054] Get the coolant flow limit Q of the cooling and lubrication system max , where Q≤Q max .

[0055] In one embodiment, the coolant flow limit Q of the cooling and lubrication system is obtained. max methods, including:

[0056] According to the displacement V and maximum speed n of the cooling motor max Get the coolant flow limit Q of the cooling and lubrication system max , where Q max =V×n max / 1000.

[0057] In one embodiment, obtaining the control parameters of the cooling and lubrication system according to the determination result includes:

[0058] If Q1>Q min , or Q2>Q min , then determine whether Q4 is greater than Q min ;

[0059] If Q4≤Q min , then the control parameters are obtained according to Q1, Q2 and Q3.

[0060] In one embodiment, obtaining the control parameter according to Q1, Q2, and Q3 includes:

[0061] Q= max (Q1, Q2, Q3), k1=1, k2=1, k3=0.

[0062] In one embodiment, the method for obtaining the control parameter according to Q1, Q2, and Q3 includes:

[0063] Q = max (Q1, Q2, Q3)+e1; k1=1; k2=1; k3=0;

[0064] Here, e1 represents the maximum value of the flow rate of the coolant lost between the coolant main channel and the generator, the flow rate lost between the coolant main channel and the first drive motor, and the flow rate lost between the coolant main channel and the first reduction gearbox.

[0065] In one embodiment, obtaining the control parameters of the cooling and lubrication system according to the determination result further includes:

[0066] If Q4>Q min , then the control parameters are obtained according to Q1, Q2, Q3, Q4 and Q5.

[0067] In one embodiment, obtaining the control parameter according to Q1, Q2, Q3, Q4, and Q5 includes:

[0068] Q= max (Q1, Q2, Q3)+ max (Q4, Q5); k1=1;

[0069] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0070] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

[0071] In one embodiment, the method for obtaining the control parameter according to Q1, Q2, Q3, Q4, and Q5 includes:

[0072] Q= max (Q1, Q2, Q3)+ max (Q4, Q5)+ e2; k1=1;

[0073] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0074] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5));

[0075] Among them, e2 represents the maximum value of the flow rate lost between the coolant main channel and the generator, the flow rate lost between the coolant and the first drive motor, the flow rate lost between the coolant and the first reduction gearbox, the flow rate lost between the coolant and the second drive motor, and the flow rate lost between the coolant and the second reduction gearbox.

[0076] In one embodiment, obtaining the control parameters of the cooling and lubrication system according to the determination result further includes:

[0077] If Q1≤Q min And Q2≤Q min , then determine whether Q4 is greater than Q min ;

[0078] If Q4>Q min , then obtain the control parameters according to Q4 and Q5.

[0079] In one embodiment, obtaining the control parameter according to Q4 and Q5 includes:

[0080] Q = max (Q4, Q5); k1 = 0;

[0081] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0082] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

[0083] In one embodiment, obtaining the control parameter according to Q4 and Q5 includes:

[0084] Q= max (Q4, Q5) + e3; k1 = 0;

[0085] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0086] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5));

[0087] Here, e3 represents the maximum value of the flow rate lost between the coolant main channel and the second drive motor and the flow rate lost between the coolant main channel and the second reduction gearbox.

[0088] In one embodiment, obtaining the control parameters of the cooling and lubrication system according to the determination result further includes:

[0089] If Q4≤Q min , then obtain the control parameters according to Q3.

[0090] In one embodiment, obtaining the control parameter according to Q3 includes:

[0091] Q = max (Q3, Q min ), k1=0, k2=k3=0.

[0092] In one embodiment, the method for obtaining the control parameter according to Q3 includes:

[0093] Q = max (Q3, Q min )+ e4;k1=0;k2=k3=0;

[0094] Wherein, e4 represents the flow rate of the coolant lost between the coolant main channel and the first reduction gearbox.

[0095] In one embodiment, the control method further includes:

[0096] If the vehicle is powered off, determine whether to activate the cooling function.

[0097] In one embodiment, if the vehicle is powered off, determining whether to activate the rear run cooling includes:

[0098] The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the generator, the first drive motor, or the first reduction gearbox at the current moment is Ta, and the temperature of the generator, the first drive motor, or the first reduction gearbox after t4 is Tb;

[0099] If Ta-Tb>T3, the temperature of the generator, the first drive motor, or the first reduction gearbox is greater than T4 and less than T5, then a short post-operation cooling of the generator, the first drive motor, and the first reduction gearbox is activated;

[0100] If Ta-Tb>T3, the temperature of the generator, the first drive motor, or the first reduction gearbox is greater than T5, and long-term post-operation cooling of the generator, the first drive motor, and the first reduction gearbox is activated.

[0101] In one embodiment, if the vehicle is powered off, determining whether to activate the rear run cooling includes:

[0102] The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the second drive motor or the second reduction gearbox at the current moment is Ta, and the corresponding temperature of the second drive motor or the second reduction gearbox after t4 is Tb;

[0103] If Tc-Td>T3, and the temperature of the second drive motor or the second reduction gearbox is greater than T4 and less than T5, a short post-operation cooling of the second drive motor and the second reduction gearbox is activated;

[0104] If Tc-Td>T3, the temperature of the second drive motor or the second reduction gearbox is greater than T5, and the long-term post-operation cooling of the second drive motor and the second reduction gearbox is activated.

[0105] In one embodiment, the control method further includes:

[0106] If the post-operation cooling of the generator, the first drive motor and the first reduction gearbox is activated, k1=1, k2=k3=0 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =Qc;

[0107] If the post-operation cooling of the second drive motor and the second reduction gearbox is activated, k1=0, k2=0, k3=1 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =Qc;

[0108] If the post-operation cooling of the generator, the first drive motor, the first reduction gearbox, the second drive motor and the second reduction gearbox is activated, k1=1, k2=k3=1 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =2Qc.

[0109] In one embodiment, after the step of powering on the vehicle, the step further includes: activating a fan assembly.

[0110] In one embodiment, the activating the fan assembly includes:

[0111] If the temperature of the first reduction gearbox is greater than the sixth preset temperature T6 and less than or equal to the seventh preset temperature T7, the fan assembly operates at a low windshield;

[0112] If the temperature of the first reduction gearbox is greater than the seventh preset temperature T7, the fan assembly operates at a high wind speed.

[0113] The cooling and lubrication system of the embodiment of the present application includes a main coolant channel and a coolant sub-channel. The coolant sub-channel includes a first sub-channel having a first branch and a second branch. The first branch and the second branch are both connected to the main coolant channel. That is to say, the cooling and lubrication system can be connected to the first branch and the second branch through a main coolant channel. The first branch transports coolant to cool and lubricate the generator and the drive motor, and the second branch transports coolant to cool and lubricate the first reduction gearbox. At the same time, through reasonable control and distribution of the coolant, the cooling and lubrication system provided by the embodiment of the present application has good cooling and lubrication effect. In addition, it has low requirements for layout space and high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0114] Figure 1 This is a schematic structural diagram of a cooling and lubrication system according to an embodiment of the present application;

[0115] Figure 2 A schematic diagram of a method for controlling a cooling and lubrication system according to an embodiment of the present application;

[0116] Figure 3 This is a flow chart of a method for controlling a cooling and lubrication system according to an embodiment of the present application.

[0117] Description of Reference Numerals

[0118] Coolant main channel 10; oil pan 11; cooling motor 12; filter 13; oil pump 14; radiator 15; coolant sub-channel 20; first sub-channel 21; first branch 211; second branch 212; switching valve 213; second sub-channel 22; electric drive system 30; generator 31; first drive motor 32; first reduction gearbox 33; second drive motor 34; second reduction gearbox 35; regulating valve 40; fan assembly 50; MTCU 60; temperature sensor 70. DETAILED DESCRIPTION

[0119] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0120] In the description of the embodiments of the present application, it should be noted that the terms "first," "second," "third," "fourth," "fifth," "sixth," and "seventh" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In addition, the parameters in the embodiments of the present application are calibrated.

[0121] The present application embodiment provides a cooling and lubrication system. Figure 1The cooling and lubrication system includes a cooling liquid main channel 10, an electric drive system 30 and a cooling liquid sub-channel 20.

[0122] The coolant in the coolant main channel 10 is transported to the electric drive system 30 through the coolant sub-channel 20 to cool and lubricate the components of the electric drive system 30 , thereby protecting the components of the electric drive system 30 .

[0123] See also Figure 1 The cooling liquid main channel 10 is connected to the cooling liquid sub-channel 20, and the cooling liquid sub-channel 20 includes a first sub-channel 21 having a first branch 211 and a second branch 212. That is, the cooling lubrication system can be connected to the first branch 211 and the second branch 212 through a cooling liquid main channel 10, so that the structure of the cooling lubrication system is simple, the structure of the cooling lubrication system is simplified, the layout space requirement is low, and the cost performance is high.

[0124] See also Figure 1 The coolant from the coolant main channel 10 can be delivered to the generator 31 and the drive motor through the first branch 211 to cool and lubricate the generator 31 and the drive motor, and can be delivered to the first reduction gearbox 33 through the second branch 212 to cool and lubricate the first reduction gearbox 33.

[0125] An embodiment of the present application also provides a vehicle, which includes the cooling and lubrication system of any embodiment of the present application.

[0126] It should be noted that the specific type of vehicle is not limited here, for example, it can be a hybrid vehicle, a pure electric vehicle, etc. In the embodiment of the present application, the vehicle is a hybrid vehicle as an example.

[0127] In related technologies, the cooling and lubrication system uses a dual electronic oil pump and a three-way temperature control valve. A small-displacement oil pump pumps oil when the engine is cold, and a large-displacement oil pump pumps oil when the engine is hot, providing cooling and lubrication for the electric drive system. This cooling and lubrication system requires a lot of space and has a low cost-effectiveness.

[0128] The cooling and lubrication system of the embodiment of the present application includes a coolant main channel 10 and a coolant sub-channel 20. The coolant sub-channel 20 includes a first sub-channel 21 having a first branch 211 and a second branch 212. The first branch 211 and the second branch 212 are both connected to the coolant main channel 10. That is to say, the cooling and lubrication system can be connected to the first branch 211 and the second branch 212 through a coolant main channel 10. The first branch 211 transports coolant to cool and lubricate the generator 31 and the drive motor, and the coolant is transported through the second branch 212 to cool and lubricate the first reduction gearbox 33. At the same time, through reasonable control and distribution of the coolant, the cooling and lubrication system provided by the embodiment of the present application has good cooling and lubrication effect. In addition, it has low requirements for layout space and high cost performance.

[0129] In one embodiment, please refer to Figure 1 The electric drive system 30 includes a second drive motor 34 and a second reduction gearbox 35 .

[0130] That is to say, in this embodiment, the electric drive system 30 is a four-wheel drive system, including a front-wheel drive system and a rear-wheel drive system. Exemplarily, the generator 31, the first drive motor 32 and the first reduction gearbox 33 are the front-wheel drive system, the first drive motor 32 is the front-wheel drive motor, the second drive motor 34 and the second reduction gearbox 35 are the rear-wheel drive system, and the second drive motor 34 is the rear-wheel drive motor.

[0131] The coolant sub-channel 20 includes a second sub-channel 22 connected in parallel with the first sub-channel 21. Coolant from the main coolant channel 10 can be delivered to the second drive motor 34 and the second reduction gearbox 35 via the second sub-channel 22, thereby cooling and lubricating the second drive motor 34 and the second reduction gearbox 35. In other words, the cooling and lubrication system cools and lubricates the front drive system through the first sub-channel 21 and cools and lubricates the rear drive system through the second sub-channel 22.

[0132] In related technologies, the cooling and lubrication system uses a dual electronic oil pump and a three-way temperature control valve. A small-displacement oil pump pumps oil when the engine is cold, and a large-displacement oil pump pumps oil when the engine is hot, providing cooling and lubrication for the electric drive system. This type of cooling and lubrication system is suitable for cooling two-wheel drive systems but is not suitable for cooling four-wheel drive systems.

[0133] The cooling and lubrication system of the embodiment of the present application, by providing a second sub-channel 22 connected in parallel with the first sub-channel 21, connects the main coolant channel 10 with the second sub-channel 22, and cools and lubricates the rear-wheel drive system through the second sub-channel 22. In other words, the cooling and lubrication system of the embodiment of the present application can meet the cooling and lubrication requirements of the electric drive system 30 of a two-wheel drive hybrid vehicle and the electric drive system 30 of a four-wheel drive hybrid vehicle, protecting the electric drive components. At the same time, by rationally controlling and allocating cooling and lubrication needs, it improves cooling and lubrication efficiency and reduces energy consumption.

[0134] In one embodiment, please refer to Figure 1 The cooling and lubrication system includes a regulating valve 40, through which the main coolant channel 10 communicates with the first sub-channel 21 and the second sub-channel 22. That is, the regulating valve 40 includes at least one inlet and two outlets. The inlet communicates with the main coolant channel 10, and the two outlets communicate with the first sub-channel 21 and the second sub-channel 22, respectively.

[0135] It should be noted that the regulating valve 40 can adjust the opening, that is, the opening of the first sub-channel 21 and the second sub-channel 22 can be adjusted to control the flow of coolant entering the first sub-channel 21 and the second sub-channel 22 .

[0136] Exemplarily, the regulating valve 40 is a proportional valve. That is, the proportional valve provides cooling and lubrication for the electric drive system 30 of a four-wheel-drive hybrid vehicle, resulting in a simple structure and a simplified cooling system. For a two-wheel-drive hybrid vehicle, the proportional valve can be omitted.

[0137] In one embodiment, please refer to Figure 1 The cooling and lubrication system includes a motor transmission control unit (MTCU) 60 and at least one temperature sensor 70 connected to the MTCU 60. It should be noted that the at least one temperature sensor 70 may be one or more.

[0138] In one embodiment, the temperature sensor 70 is signal-connected to the generator 31 . That is, the temperature sensor 70 can be used to obtain the temperature of the generator 31 and then transmit the temperature of the generator 31 to the MTCU 60 .

[0139] In one embodiment, the temperature sensor 70 is signal-connected to the first drive motor 32 . That is, the temperature sensor 70 can be used to obtain the temperature of the first drive motor 32 and then transmit the temperature of the first drive motor 32 to the MTCU 60 .

[0140] In one embodiment, the temperature sensor 70 is signal-connected to the second drive motor 34 . That is, the temperature sensor 70 can be used to obtain the temperature of the second drive motor 34 and then transmit the temperature of the second drive motor 34 to the MTCU 60 .

[0141] In one embodiment, the temperature sensor 70 is signal-connected to the main coolant channel 10 . That is, the temperature sensor 70 can be used to obtain the temperature of the coolant in the main coolant channel 10 and then transmit the temperature of the coolant in the main coolant channel 10 to the MTCU 60 .

[0142] In one embodiment, please refer to Figure 1 The first sub-channel 21 includes an on-off valve 213, which is disposed on the first branch 211. In other words, the on-off valve 213 can be used to control the connection or closure of the first branch 211, thereby controlling and distributing the coolant flow, improving cooling and lubrication efficiency, and reducing energy consumption.

[0143] It should be noted that the switch valve 213 can be a switch valve 213 with adjustable opening, such as a regulating valve 40, or it can be a switch valve 213 with non-adjustable opening, such as a switch solenoid valve. In the embodiment of the present application, the switch valve 213 is taken as a switch solenoid valve as an example for explanation.

[0144] In one embodiment, please refer to Figure 1 The cooling and lubrication system includes a fan assembly 50, which is used to cool the electric drive system 30. It is understood that when the temperature of the electric drive system 30 is very high, the fan assembly 50 and the coolant channel are used together to cool the electric drive system 30, thereby improving the cooling effect and protecting the components of the electric drive system 30 to the greatest extent.

[0145] For example, in one embodiment, the fan assembly 50 can cool the generator 31, first drive motor 32, and first reduction gearbox 33 of the front drive system. In other embodiments, the fan assembly 50 can also cool the second drive motor 34 and second reduction gearbox 35 of the rear drive system. In still other embodiments, the fan assembly 50 can also cool the MTCU 60.

[0146] In one embodiment, please refer to Figure 1 The coolant main channel 10 includes an oil pan 11, a cooling motor 12, a filter 13, an oil pump 14 and a radiator 15. The oil inlet of the filter 13 is connected to the oil pan 11, and the oil outlet of the filter 13 is connected to the oil pump 14. The coolant delivered by the oil pump 14 driven by the cooling motor 12 is delivered to the coolant sub-channel 20 through the radiator 15.

[0147] Specifically, the filter 13 removes impurities, colloids, and water from the coolant from the oil pan 11 and delivers the clean coolant to the oil pump 14 .

[0148] The oil pump 14 increases the pressure of the coolant from the filter 13 to a certain level, and after being cooled by the radiator 15 , delivers the coolant to the first sub-channel 21 and the second sub-channel 22 which are arranged in parallel.

[0149] The cooling motor 12 is drivingly connected to the oil pump 14 to provide power to the oil pump 14 .

[0150] In one embodiment, the first sub-channel 21 includes a first oil return channel. After the coolant cools and lubricates the front drive system, it flows into the oil pan 11 through the first oil return channel, so that the coolant can continue to circulate.

[0151] In one embodiment, the second sub-channel 22 includes a second oil return channel. After the coolant cools and lubricates the rear drive system, it flows into the oil pan 11 through the second oil return channel, so that the coolant can continue to circulate.

[0152] For example, the cooling and lubrication system of the embodiment of the present application includes but is not limited to the following cooling and lubrication modes:

[0153] Cooling and lubrication mode of the first reduction gearbox 33: the coolant delivered by the oil pump 14 enters the second branch 212 after passing through the radiator 15 and the regulating valve 40, and is delivered to the first reduction gearbox 33 through the second branch 212 and cools and lubricates the first reduction gearbox 33 before flowing back to the oil pan 11 to achieve cooling and lubrication of the first reduction gearbox 33.

[0154] Cooling and lubrication mode of the generator 31, the first drive motor 32 and the first reduction gearbox 33: After the coolant delivered by the oil pump 14 passes through the radiator 15 and the regulating valve 40, a part of the coolant enters the first branch 211 through the switch valve 213, and is delivered to the generator 31 and the drive motor through the first branch 211 and cools and lubricates the generator 31 and the drive motor before flowing back to the oil pan 11; the other part of the coolant enters the second branch 212, and is delivered to the first reduction gearbox 33 through the second branch 212 and cools and lubricates the first reduction gearbox 33 before flowing back to the oil pan 11, thereby achieving simultaneous cooling and lubrication of the generator 31, the first drive motor 32 and the first reduction gearbox 33.

[0155] Cooling and lubrication mode of the second drive motor 34 and the second reduction gearbox 35: the coolant delivered by the oil pump 14 enters the second sub-channel 22 after passing through the radiator 15 and the regulating valve 40, and is delivered to the second drive motor 34 and the second reduction gearbox 35 through the second sub-channel 22 for cooling and lubrication, and then flows back to the oil pan 11 to achieve cooling and lubrication of the second drive motor 34 and the second reduction gearbox 35.

[0156] The cooling and lubrication mode of the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35 is as follows: after the coolant delivered by the oil pump 14 passes through the radiator 15 and the regulating valve 40, a part of the coolant enters the second sub-channel 22, is delivered to the second drive motor 34 and the second reduction gearbox 35 through the second sub-channel 22 for cooling and lubrication, and then flows back to the oil pan 11; the other part of the coolant enters the second branch 212, is delivered to the first reduction gearbox 33 through the second branch 212, cools and lubricates the first reduction gearbox 33, and then flows back to the oil pan 11, so as to achieve simultaneous cooling and lubrication of the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35.

[0157] Cooling and lubrication mode of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35: After the coolant delivered by the oil pump 14 passes through the radiator 15 and the regulating valve 40, a part of the coolant enters the first branch 211 through the switch valve 213, is delivered to the generator 31 and the drive motor through the first branch 211, and cools and lubricates the generator 31 and the drive motor before flowing back to the oil pan 11; another part of the coolant enters the second branch 212, is delivered to the first reduction gearbox 33 through the second branch 212, and cools and lubricates the first reduction gearbox 33 before flowing back to the oil pan 11; another part of the coolant enters the second sub-channel 22, is delivered to the second drive motor 34 and the second reduction gearbox 35 through the second sub-channel 22 for cooling and lubrication, and then flows back to the oil pan 11, so as to achieve simultaneous cooling and lubrication of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35.

[0158] Cooling and lubrication mode of the fan assembly 50: The fan assembly 50 can cool the generator 31, the first drive motor 32 and the first reduction gearbox 33 of the front drive system.

[0159] The embodiment of the present application also provides a control method for a cooling and lubrication system, which includes an electric drive system 30, a main coolant channel 10, and a first sub-channel 21 and a second sub-channel 22 arranged in parallel. The first sub-channel 21 and the second sub-channel 22 are both connected to the main coolant channel 10. The electric drive system 30 includes a generator 31, a first drive motor 32, a first reduction gearbox 33, a second drive motor 34, and a second reduction gearbox 35. The coolant from the main coolant channel 10 can be transported to the generator 31, the drive motor, and the first reduction gearbox 33 through the first sub-channel 21 and cool and lubricate the generator 31, the drive motor, and the first reduction gearbox 33. The coolant from the main coolant channel 10 can be transported to the second drive motor 34 and the second reduction gearbox 35 through the second sub-channel 22 and cool and lubricate the second drive motor 34 and the second reduction gearbox 35. Please refer to Figure 2 , the control method mainly includes the following steps:

[0160] Step S101: The vehicle is powered on;

[0161] Step S102: activating the cooling lubrication mode;

[0162] Step S103: obtaining the coolant flow required by each component of the electric drive system;

[0163] Step S104: Obtain the minimum coolant flow Q of the cooling and lubrication system min ;

[0164] Step S105: Determine whether the coolant flow required by the generator or the first drive motor is greater than Q min ;

[0165] Step S106: According to the determination result, the control parameters of the cooling and lubrication system are obtained.

[0166] The control method of the cooling and lubrication system provided in the embodiment of the present application obtains the coolant flow required by each component of the electric drive system 30 and the minimum coolant flow Q of the cooling and lubrication system. min , and then judge whether the coolant flow required by the generator 31 or the first drive motor 32 is greater than Q min According to the judgment result, the control parameters of the cooling and lubrication system are obtained, that is, while ensuring that the coolant flow rate can effectively reduce the temperature of the components of the electric drive system 30, unnecessary waste is avoided, thereby improving the cooling and lubrication efficiency of the cooling and lubrication system and reducing energy consumption.

[0167] It should be noted that the control method of the cooling and lubrication system provided in the embodiments of the present application can be applied to the vehicle in any embodiment of the present application.

[0168] It should be noted that the specific type of vehicle is not limited here, for example, it can be a hybrid vehicle, a pure electric vehicle, etc. In the embodiment of the present application, the vehicle is a hybrid vehicle as an example.

[0169] The cooling and lubrication system of the embodiment of the present application includes a cooling liquid main channel 10 , an electric drive system 30 , and a cooling liquid sub-channel 20 .

[0170] The coolant in the coolant main channel 10 is transported to the electric drive system 30 through the coolant sub-channel 20 to cool and lubricate the components of the electric drive system 30 , thereby protecting the components of the electric drive system 30 .

[0171] See also Figure 1The cooling liquid main channel 10 is connected to the cooling liquid sub-channel 20, and the cooling liquid sub-channel 20 includes a first sub-channel 21 having a first branch 211 and a second branch 212. That is, the cooling lubrication system can be connected to the first branch 211 and the second branch 212 through a cooling liquid main channel 10, so that the structure of the cooling lubrication system is simple, the structure of the cooling lubrication system is simplified, the layout space requirement is low, and the cost performance is high.

[0172] See also Figure 1 The coolant from the coolant main channel 10 can be delivered to the generator 31 and the drive motor through the first branch 211 to cool and lubricate the generator 31 and the drive motor, and can be delivered to the first reduction gearbox 33 through the second branch 212 to cool and lubricate the first reduction gearbox 33.

[0173] The cooling and lubrication system of the embodiment of the present application includes a coolant main channel 10 and a coolant sub-channel 20. The coolant sub-channel 20 includes a first sub-channel 21 having a first branch 211 and a second branch 212. The first branch 211 and the second branch 212 are both connected to the coolant main channel 10. That is, the cooling and lubrication system can be connected to the first branch 211 and the second branch 212 through a coolant main channel 10. The first branch 211 transports coolant to cool and lubricate the generator 31 and the drive motor, and the coolant is transported through the second branch 212 to cool and lubricate the first reduction gearbox 33. At the same time, through reasonable control and distribution of the coolant, the cooling and lubrication system provided by the embodiment of the present application has good cooling and lubrication effect. In addition, it has low requirements for layout space and high cost performance.

[0174] In one embodiment, please refer to Figure 1 The electric drive system 30 includes a second drive motor 34 and a second reduction gearbox 35 .

[0175] That is to say, in this embodiment, the electric drive system 30 is a four-wheel drive system, including a front-wheel drive system and a rear-wheel drive system. Exemplarily, the generator 31, the first drive motor 32 and the first reduction gearbox 33 are the front-wheel drive system, the first drive motor 32 is the front-wheel drive motor, the second drive motor 34 and the second reduction gearbox 35 are the rear-wheel drive system, and the second drive motor 34 is the rear-wheel drive motor.

[0176] The coolant sub-channel 20 includes a second sub-channel 22 connected in parallel with the first sub-channel 21. Coolant from the main coolant channel 10 can be delivered to the second drive motor 34 and the second reduction gearbox 35 through the second sub-channel 22, thereby cooling and lubricating the second drive motor 34 and the second reduction gearbox 35. In other words, the cooling and lubrication system can cool and lubricate the front drive system through the first sub-channel 21 and cool and lubricate the rear drive system through the second sub-channel 22.

[0177] The cooling and lubrication system of the embodiment of the present application provides a second sub-channel 22 connected in parallel with the first sub-channel 21, connecting the main coolant channel 10 with the second sub-channel 22, and cooling and lubricating the rear-wheel drive system through the second sub-channel 22. In other words, the cooling and lubrication system of the embodiment of the present application can meet the cooling and lubrication requirements of the electric drive system 30 of a two-wheel drive hybrid vehicle and the electric drive system 30 of a four-wheel drive hybrid vehicle, protecting the electric drive components. At the same time, by rationally controlling and allocating cooling and lubrication needs, it improves cooling and lubrication efficiency and reduces energy consumption.

[0178] In one embodiment, please refer to Figure 1 The cooling and lubrication system includes a regulating valve 40, through which the main coolant channel 10 communicates with the first sub-channel 21 and the second sub-channel 22. That is, the regulating valve 40 includes at least one inlet and two outlets. The inlet communicates with the main coolant channel 10, and the two outlets communicate with the first sub-channel 21 and the second sub-channel 22, respectively.

[0179] It should be noted that the regulating valve 40 can adjust the opening, that is, the opening of the first sub-channel 21 and the second sub-channel 22 can be adjusted to control the flow of coolant entering the first sub-channel 21 and the second sub-channel 22 .

[0180] Exemplarily, the regulating valve 40 is a proportional valve. That is, the proportional valve provides cooling and lubrication for the electric drive system 30 of a four-wheel-drive hybrid vehicle, resulting in a simple structure and a simplified cooling system. For a two-wheel-drive hybrid vehicle, the proportional valve can be omitted.

[0181] In one embodiment, please refer to Figure 1 The first sub-channel 21 includes an on-off valve 213, which is disposed on the first branch 211. In other words, the on-off valve 213 can be used to control the connection or closure of the first branch 211, thereby controlling and distributing the coolant flow, improving cooling and lubrication efficiency, and reducing energy consumption.

[0182] It should be noted that the switch valve 213 can be a switch valve 213 with adjustable opening, such as a regulating valve 40, or it can be a switch valve 213 with non-adjustable opening, such as a switch solenoid valve. In the embodiment of the present application, the switch valve 213 is taken as a switch solenoid valve as an example for explanation.

[0183] In one embodiment, please refer to Figure 1 The coolant main channel 10 includes an oil pan 11, a cooling motor 12, a filter 13, an oil pump 14 and a radiator 15. The oil inlet of the filter 13 is connected to the oil pan 11, and the oil outlet of the filter 13 is connected to the oil pump 14. The coolant delivered by the oil pump 14 driven by the cooling motor 12 is delivered to the coolant sub-channel 20 through the radiator 15.

[0184] Specifically, the filter 13 removes impurities, colloids, and water from the coolant from the oil pan 11 and delivers the clean coolant to the oil pump 14 .

[0185] The oil pump 14 increases the pressure of the coolant from the filter 13 to a certain level, and after being cooled by the radiator 15 , delivers the coolant to the first sub-channel 21 and the second sub-channel 22 which are arranged in parallel.

[0186] The cooling motor 12 is drivingly connected to the oil pump 14 to provide power to the oil pump 14 .

[0187] The control method of the cooling and lubrication system of the embodiment of the present application is described in detail below with reference to specific embodiments.

[0188] In step S102, the cooling and lubrication mode is activated. When the vehicle is powered on, the cooling and lubrication mode is activated. Initially, the coolant flow is 0, and the control valve and the switch valve 213 maintain their initial state, which is 0, that is, the control valve and the switch valve 213 are initially closed.

[0189] In step S103 , the coolant flow rate required by each component of the electric drive system 30 is obtained.

[0190] The electric drive system 30 includes a front drive system, which includes a generator 31 , a first drive motor 32 and a first reduction gearbox 33 .

[0191] The electric drive system 30 includes a rear drive system, which includes a second drive motor 34 and a second reduction gearbox 35 .

[0192] In one embodiment, obtaining the coolant flow required by each component of the electric drive system 30 includes:

[0193] The coolant flow rate Q1 required by the generator 31 , the coolant flow rate Q2 required by the first drive motor 32 , the coolant flow rate Q3 required by the first reduction gearbox 33 , the coolant flow rate Q4 required by the second drive motor 34 , and the coolant flow rate Q5 required by the second reduction gearbox 35 are obtained.

[0194] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system 30 includes:

[0195] Based on the temperatures of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34, and the second reduction gearbox 35, the coolant flow rate Q1′ required for the generator 31, the coolant flow rate Q2′ required for the first drive motor 32, the coolant flow rate Q3′ required for the first reduction gearbox 33, the coolant flow rate Q4′ required for the second drive motor 34, and the coolant flow rate Q5′ required for the second reduction gearbox 35 are obtained. Thus, Q1 = Q1′, Q2 = Q2′, Q3 = Q3′, Q4 = Q4′, and Q5 = Q5′. In other words, based on the temperatures of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34, and the second reduction gearbox 35, the coolant flow rate required for each component of the electric drive system 30 is obtained.

[0196] In one embodiment, the cooling and lubrication system includes a motor transmission control unit (MTCU) 60 and at least one temperature sensor 70 signal-connected to the MTCU 60. It should be noted that the term "at least one" refers to one or more temperature sensors 70. Specifically, the temperature sensor 70 can be signal-connected to various components of the electric drive system 30, such as the generator 31, the first drive motor 32, and the second drive motor 34. The temperature sensor 70 can be used to obtain the temperature of each component of the electric drive system 30 and then transmit the temperature of each component of the electric drive system 30 to the MTCU 60.

[0197] By obtaining the temperature-coolant flow relationship of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35, the coolant flow required by each component of the electric drive system 30 is obtained according to the temperature of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35.

[0198] Specifically, by setting different operating target temperatures for each component of the electric drive system 30, when the target component temperature rises to the target operating temperature, the speed of the cooling motor 12 is gradually increased, that is, sufficient coolant flow is provided until the target component temperature can stabilize at the target operating temperature. The coolant flow rates at different target temperatures are recorded in sequence, and finally the temperature-coolant flow relationship of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34, and the second reduction gearbox 35 is summarized. Therefore, based on the temperatures of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34, and the second reduction gearbox 35, the coolant flow rate Q1′ required for the generator 31, the coolant flow rate Q2′ required for the first drive motor 32, the coolant flow rate Q3′ required for the first reduction gearbox 33, the coolant flow rate Q4′ required for the second drive motor 34, and the coolant flow rate Q5′ required for the second reduction gearbox 35 can be obtained accordingly.

[0199] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system 30 includes:

[0200] Based on the temperature difference between the generator 31 and the first reduction gearbox 33, the temperature difference between the first drive motor 32 and the first reduction gearbox 33, and the temperature difference between the second drive motor 34 and the second reduction gearbox 35, the coolant flow rate Q1″ required for the generator 31, the coolant flow rate Q2″ required for the first drive motor 32, the coolant flow rate Q3″ required for the first reduction gearbox 33, the coolant flow rate Q4″ required for the second drive motor 34, and the coolant flow rate Q5″ required for the second reduction gearbox 35 are obtained, then Q1= Q1″, Q2= Q2″, Q3= Q3″, Q4= Q4″, Q5= Q5″. In other words, based on the temperature difference between the generator 31 and the first reduction gearbox 33, the temperature difference between the first drive motor 32 and the first reduction gearbox 33, and the temperature difference between the second drive motor 34 and the second reduction gearbox 35, the coolant flow rate required for each component of the electric drive system 30 is obtained.

[0201] By obtaining the temperature difference-coolant flow relationship between the generator 31 and the first gearbox 33, between the first drive motor 32 and the first gearbox 33, and between the second drive motor 34 and the second gearbox 35, and then according to the temperature difference between the generator 31 and the first gearbox 33, the temperature difference between the first drive motor 32 and the first gearbox 33, and the temperature difference between the second drive motor 34 and the second gearbox 35, the coolant flow required for each component of the electric drive system 30 is obtained accordingly.

[0202] Specifically, by setting different target operating temperature differences between the various components of the electric drive system 30, when the temperature difference rises to the target value, the speed of the cooling motor 12 is gradually increased, that is, sufficient coolant flow is provided until the various components of the electric drive system 30 can stabilize at the target operating temperature. The coolant flow rates at different target temperature differences are recorded in sequence, and finally, the temperature difference-coolant flow rate relationships between the generator 31 and the first reduction gearbox 33, between the first drive motor 32 and the first reduction gearbox 33, and between the second drive motor 34 and the second reduction gearbox 35 are summarized. Thus, based on the temperature difference between the generator 31 and the first reduction gearbox 33, the temperature difference between the first drive motor 32 and the first reduction gearbox 33, and the temperature difference between the second drive motor 34 and the second reduction gearbox 35, the coolant flow rate Q1″ required for the generator 31, the coolant flow rate Q2″ required for the first drive motor 32, the coolant flow rate Q3″ required for the first reduction gearbox 33, the coolant flow rate Q4″ required for the second drive motor 34, and the coolant flow rate Q5″ required for the second reduction gearbox 35 can be obtained accordingly.

[0203] In one embodiment, a method for obtaining the coolant flow required by each component of the electric drive system 30 includes:

[0204] If the first sub-channel 21 and the second sub-channel 22 are both connected to the coolant main channel 10, then Q1=max (Q1′, Q1″), Q2=max (Q2′, Q2″), Q3=max (Q3′, Q3″), Q4=max (Q4′, Q4″), Q5=max (Q5′, Q5″).

[0205] It should be noted that Q1=max (Q1′, Q1″) means that the coolant flow rate required by the generator 31 is the maximum value of Q1′ and Q1″; Q2=max (Q2′, Q2″) means that the coolant flow rate required by the first drive motor 32 is the maximum value of Q2′ and Q2″; Q3=max (Q3′, Q3″) means that the coolant flow rate required by the first reducer 33 is the maximum value of Q3 and Q3″; Q4=max (Q4′, Q4″) means that the coolant flow rate required by the generator 31 is the maximum value of Q4′ and Q4″; Q5=max (Q5′, Q5″) means that the coolant flow rate required by the generator 31 is the maximum value of Q5′ and Q5″.

[0206] That is to say, if the first sub-channel 21 and the second sub-channel 22 are both connected to the coolant main channel 10, that is, when both the front drive system and the rear drive system of the electric drive system 30 need to be cooled and lubricated, then the coolant flow rate required for each component of the electric drive system 30 needs to be determined by respectively checking the obtained values ​​of the temperature-coolant flow rate relationship and the obtained values ​​of the temperature difference-coolant flow rate relationship, and comparing them to take the larger value of the two.

[0207] In step S104, the minimum coolant flow Q of the cooling and lubrication system is obtained. min .

[0208] In one embodiment, the minimum coolant flow Q is obtained min methods, including:

[0209] According to the speed n1 of the generator 31, the speed n2 of the first drive motor 32, the speed n3 of the second drive motor 34 and the minimum coolant flow Q3 required by the first reduction box 33 min and the minimum coolant flow rate Q5 required by the second reduction gearbox 35 min , get the minimum coolant flow Q min .

[0210] Specifically, the minimum coolant flow rate Q is obtained according to the speed n1 of the generator 31, the speed n2 of the first drive motor 32 and the speed n3 of the second drive motor 34. min ,include:

[0211] If n1>0, or n2>0, and n3=0, then Q min = Q3 min That is, if the speed n1 of the generator 31 or the speed n2 of the first drive motor 32 is greater than 0, but the speed of the second drive motor 34 is equal to 0, that is, the front drive system needs cooling and lubrication, and the rear drive system does not need cooling and lubrication, then the minimum coolant flow Q min The value of is the minimum coolant flow rate Q3 required by the first reduction box 33 min .

[0212] If n1=0, n2=0, and n3>0, then Q min = Q5 min That is, if the speed n1 of the generator 31 and the speed n2 of the first drive motor 32 are both 0, and the speed of the second drive motor 34 is greater than 0, that is, the front drive system does not need cooling and lubrication, and the rear drive system needs cooling and lubrication, then the minimum coolant flow Q min The value of is the minimum coolant flow Q5 required by the second reduction box 35 min .

[0213] If n1>0, n2>0, and n3>0, then Q min = max(Q3 min , Q5 min ). It should be noted that Q min = max(Q3 min , Q5 min ) refers to the minimum coolant flow Q min For Q3 min With Q5min If the speed n1 of the generator 31, the speed n2 of the first drive motor 32, and the speed n3 of the second drive motor 34 are all greater than 0, that is, both the front drive system and the rear drive system require cooling and lubrication, then the minimum coolant flow rate Q min The value of is the minimum coolant flow rate Q3 required by the first reduction box 33 min The minimum coolant flow rate Q5 required by the second reduction gearbox 35 min The maximum value in .

[0214] In one embodiment, according to n1, n2, n3 and Q3 min and Q5 min , get the minimum coolant flow Q min Before the step of: obtaining Q3 according to the temperature of the first reduction box 33 and the second reduction box 35 min and Q5 min .

[0215] By obtaining the temperature-minimum coolant flow relationship of the first reduction box 33 and the second reduction box 35, and then according to the temperature of the first reduction box 33 and the second reduction box 35, the minimum coolant flow Q3 of the first reduction box 33 is obtained accordingly. min and the minimum coolant flow Q5 of the second reduction gearbox 35 min .

[0216] Specifically, by setting different operating target temperatures for the first reduction box 33 and the second reduction box 35, when the target component temperature rises to the target operating temperature, the speed of the cooling motor 12 is gradually increased, that is, sufficient coolant flow is provided until the target component meets the cooling and lubrication requirements. The minimum cooling and lubrication flow rates at different target temperatures are recorded in sequence, and finally the temperature-minimum coolant flow rate relationship of the first reduction box 33 and the second reduction box 35 is obtained. Therefore, the minimum coolant flow rate Q3 of the first reduction box 33 can be obtained according to the temperature of the first reduction box 33 and the second reduction box 35. min and the minimum coolant flow Q5 of the second reduction gearbox 35 min .

[0217] In one embodiment, if a trigger condition for the minimum coolant flow rate is met, the control parameter satisfies the minimum coolant flow rate, and the trigger condition includes:

[0218] Any one of n1, n2 and n3 is greater than the first preset speed N1, and after being greater than N1, it is not less than the second preset speed N2 for the first preset time t1; safety flow Q safe activation;

[0219] If the vehicle is powered on for a second preset time t2 and the coolant temperature is greater than the first preset temperature T1;

[0220] If the vehicle is in the Ready state for the third predetermined time t3, the coolant temperature is lower than the second predetermined temperature T2.

[0221] That is, as long as any one of the above trigger conditions is met, the cooling and lubrication system outputs the minimum coolant flow rate. For example, the first preset speed N1 can be in the range of 10-15 rpm, the second preset speed N2 can be in the range of 2-8 rpm, the first preset time t1 can be in the range of 2-5 seconds, the second preset time t2 can be in the range of 2-5 seconds, the third preset time t3 can be in the range of 2-5 seconds, the first preset temperature T1 can be in the range of 50°C-70°C, the second preset temperature T2 can be in the range of 40°C-60°C, and T1>T2.

[0222] In step S105, it is determined whether the cooling liquid flow required by the generator 31 or the first drive motor 32 is greater than Q min Here, the cooling liquid flow Q1 required by the generator 31 or the cooling liquid flow Q2 required by the first drive motor 32 obtained in step S103 can be used to calculate the cooling liquid flow Q1 obtained in step S104. min , and determine whether Q1 or Q2 is greater than Q min .

[0223] In step S106, control parameters of the cooling and lubrication system are obtained according to the determination result.

[0224] The control parameters include:

[0225] The coolant flow rate Q required by the cooling and lubrication system; the opening k1 of the on-off valve 213; and the opening k2 of the first sub-channel 21 and the opening k3 of the second sub-channel 22 of the regulating valve 40, respectively. Specifically, by controlling Q, k1, k2, and k3, the coolant flow rate is rationally controlled and distributed, ensuring that the coolant flow rate effectively reduces the temperature of the components of the electric drive system 30 while avoiding unnecessary waste, thereby improving cooling and lubrication efficiency and reducing energy consumption.

[0226] In one embodiment, the control method further includes: obtaining a coolant flow limit value Q of the cooling and lubrication system max , where Q≤Q max . Coolant flow limit Q of cooling lubrication system max It refers to the maximum coolant flow rate that the cooling and lubrication system can provide, that is, the flow rate of the coolant used for cooling and lubricating the electric drive system 30 cannot exceed the maximum coolant flow rate that the cooling and lubrication system can provide.

[0227] In one embodiment, the coolant flow limit Q of the cooling and lubrication system is obtained.max The method includes: according to the displacement V and the maximum speed n of the cooling motor 12 max , where Q max =V×n max / 1000.

[0228] Specifically, the maximum speed capability of the cooling motor 12 is tested by experiment, the maximum speed limit of CCP (CAN Calibration Protocol) is determined, different working target temperatures are set, and the maximum speed n of the cooling motor 12 at the working target temperature is tested. max To avoid the current of the cooling motor 12 exceeding the power supply capacity of the MTCU60, resulting in a fault of current cut-off protection, the formula Q max =V×n max / 1000 Calculate the coolant flow limit Q max .

[0229] In one embodiment, obtaining control parameters of the cooling and lubrication system according to the determination result includes:

[0230] If Q1>Q min , or Q2>Q min , then determine whether Q4 is greater than Q min ;

[0231] If Q4≤Q min , then obtain the control parameters according to Q1, Q2 and Q3.

[0232] That is, first determine whether the coolant flow rate Q1 required by the generator 31 or the coolant flow rate Q2 required by the first drive motor 32 is greater than the minimum coolant flow rate Q min If either Q1 or Q2 is greater than the minimum coolant flow rate Q min , then continue to determine whether the coolant flow rate Q4 required by the second drive motor 34 is greater than the minimum coolant flow rate Q min If the coolant flow rate Q4 ≤ Q required by the second drive motor 34 min , then obtain the control parameters according to Q1, Q2 and Q3, that is, based on the coolant flow rate Q1 required by the generator 31, the coolant flow rate Q2 required by the first drive motor 32 and the coolant flow rate Q3 required by the first reduction box 33, calculate the coolant flow rate Q required by the cooling and lubrication system and the coolant distribution ratio.

[0233] Specifically, the control parameters are obtained based on Q1, Q2, and Q3, including: Q = max (Q1, Q2, Q3), k1 = 1, k2 = 1, and k3 = 0. It should be noted that Q = max (Q1, Q2, Q3) means that the coolant flow rate Q required by the cooling and lubrication system is the maximum value of Q1, Q2, and Q3. The opening degree k1 of the switch valve 213 is 1, i.e., the switch valve 213 is in the open state. The opening degree k2 of the control valve is 1, i.e., the control valve controls the first sub-channel 21 to be conductive. The control valve controls the second sub-channel 22 to be closed by k3 = 0.

[0234] In one embodiment, obtaining control parameters according to Q1, Q2, and Q3 includes:

[0235] Q = max (Q1, Q2, Q3) + e1, k1 = 1, k2 = 1, k3 = 0, where e1 represents the maximum value of the coolant flow rate lost between the main coolant channel 10 and the generator 31, the flow rate lost between the main coolant channel 10 and the first drive motor 32, and the flow rate lost between the main coolant channel 10 and the first drive motor 32, and the flow rate lost between the main coolant channel 10 and the first drive motor 32, and the flow rate lost between the main coolant channel 10 and the first drive motor 32, and the flow rate lost between the main coolant channel 10 and the first reduction gearbox 33. In other words, this method corrects the coolant flow rate Q required for the cooling and lubrication system by adding the coolant loss during delivery to the target components of the electric drive system 30.

[0236] It should be noted that the e1 mentioned here represents the maximum value of the coolant flow rate lost between the coolant main channel 10 and the generator 31, the flow rate lost between the coolant main channel 10 and the generator 31, the flow rate lost between the coolant main channel 10 and the generator 31, the flow rate lost between the coolant main channel 10 and the generator 31, and ... and the flow rate lost between the coolant main channel 10 and the generator 31

[0237] According to the determination result, the control parameters of the cooling and lubrication system are obtained, which also includes:

[0238] If Q4>Q min , then obtain the control parameters according to Q1, Q2, Q3, Q4 and Q5.

[0239] That is, first determine whether the coolant flow rate Q1 required by the generator 31 or the coolant flow rate Q2 required by the first drive motor 32 is greater than the minimum coolant flow rate Q min If either Q1 or Q2 is greater than the minimum coolant flow rate Q min , then continue to determine whether the coolant flow rate Q4 required by the second drive motor 34 is greater than the minimum coolant flow rate Q min If the coolant flow rate Q4 required by the second drive motor 34 is greater than Q min, then the control parameters are obtained according to Q1, Q2, Q3, Q4 and Q5, that is, based on the coolant flow rate Q1 required by the generator 31, the coolant flow rate Q2 required by the first drive motor 32, the coolant flow rate Q3 required by the first reduction box 33, the coolant flow rate Q4 required by the second drive motor 34 and the coolant flow rate Q5 required by the second reduction box 35, the coolant flow rate Q required by the cooling and lubrication system and the coolant distribution ratio are calculated.

[0240] Specifically, the control parameters are obtained according to Q1, Q2, Q3, Q4, and Q5, including:

[0241] Q= max (Q1, Q2, Q3)+ max (Q4, Q5), k1=1,

[0242] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0243] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

[0244] It should be noted that Q= max (Q1, Q2, Q3) + max (Q4, Q5) means that the coolant flow Q required by the cooling and lubrication system is the sum of the maximum value among Q1, Q2 and Q3 and the maximum value among Q4 and Q5, and the opening k1 of the switch valve 213 is 1, that is, the switch valve 213 is in the open state; the control valve opening k2= max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)), that is, the control valve opening k2 is the ratio of the maximum value among Q1, Q2 and Q3 to Q; k3= max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)), that is, the control valve opening k3 is the ratio of the maximum value among Q4 and Q5 to Q; the coolant flow distribution ratio between the first sub-channel 21 and the second sub-channel 22 is k= max(Q1, Q2, Q3) / max(Q4, Q5).

[0245] In one embodiment, obtaining control parameters according to Q1, Q2, Q3, Q4, and Q5 includes:

[0246] Q = max (Q1, Q2, Q3) + max (Q4, Q5) + e2, k1 = 1, k2 = max (Q1, Q2, Q3) / (max (Q1, Q2, Q3) + max (Q4, Q5)), k3 = max (Q4, Q5) / (max (Q1, Q2, Q3) + max (Q4, Q5)), where e2 represents the maximum value of the coolant flow rate lost between the coolant main channel 10 and the generator 31, the ...

[0247] It should be noted that the e2 mentioned here represents the maximum value of the coolant flow lost between the coolant main channel 10 and the generator 31, the flow lost between the first drive motor 32, the flow lost between the first reduction gearbox 33, the flow lost between the second drive motor 34, and the flow lost between the second reduction gearbox 35. It actually refers to the maximum value of the coolant flow lost between the oil pump 14 and the generator 31, the flow lost between the oil pump 14 and the first drive motor 32, the flow lost between the oil pump 14 and the first reduction gearbox 33, the flow lost between the oil pump 14 and the second drive motor 34, and the flow lost between the oil pump 14 and the second reduction gearbox 35.

[0248] In one embodiment, obtaining the control parameters of the cooling and lubrication system according to the determination result further includes:

[0249] If Q1≤Q min And Q2≤Q min , then determine whether Q4 is greater than Q min ;

[0250] If Q4>Q min , then obtain the control parameters according to Q4 and Q5.

[0251] That is, first determine whether the coolant flow rate Q1 required by the generator 31 and the coolant flow rate Q2 required by the first drive motor 32 are greater than the minimum coolant flow rate Q min , if Q1 and Q2 are not greater than the minimum coolant flow Q min , then continue to determine whether the coolant flow rate Q4 required by the second drive motor 34 is greater than the minimum coolant flow rate Q min If the coolant flow rate Q4 required by the second drive motor 34 is greater than Q min, then the control parameters are obtained according to Q4 and Q5, that is, based on the coolant flow rate Q4 required by the second drive motor 34 and the coolant flow rate Q5 required by the second reduction box 35, the coolant flow rate Q required by the cooling and lubrication system is calculated.

[0252] Specifically, the control parameters are obtained according to Q4 and Q5, including:

[0253] Q = max (Q4, Q5); k1 = 0;

[0254] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0255] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

[0256] It should be noted that Q= max (Q4, Q5) means that the coolant flow Q required by the cooling and lubrication system is the maximum value of Q4 and Q5, and the opening k1 of the switch valve 213 is 0, that is, the switch valve 213 is in the closed state; the control valve opening k2= max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)), that is, the control valve opening k2 is the ratio of the maximum value of Q1, Q2 and Q3 to Q; k3= max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)), that is, the control valve opening k3 is the ratio of the maximum value of Q4 and Q5 to Q; the coolant flow distribution ratio between the first sub-channel 21 and the second sub-channel 22 is k=max(Q1, Q2, Q3) / max(Q4, Q5).

[0257] In one embodiment, obtaining control parameters according to Q4 and Q5 includes:

[0258] Q= max (Q4, Q5) + e3; k1 = 0;

[0259] k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5));

[0260] k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5));

[0261] Here, e3 represents the maximum value of the coolant flow rate lost between the main coolant channel 10 and the second drive motor 34, and the coolant flow rate lost between the main coolant channel 10 and the second drive motor 34, and the coolant flow rate lost between the main coolant channel 10 and the second reduction gearbox 35. In other words, this method corrects the coolant flow rate Q required for the cooling and lubrication system by adding the coolant loss during delivery to the target component of the electric drive system 30.

[0262] It should be noted that e3 mentioned here represents the maximum value of the flow rate lost between the coolant main channel 10 and the second drive motor 34, and the flow rate lost between the coolant and the second reduction gearbox 35. It actually refers to the maximum value of the flow rate lost between the oil pump 14 and the second drive motor 34, and the flow rate lost between the oil pump 14 and the second reduction gearbox 35.

[0263] According to the determination result, the control parameters of the cooling and lubrication system are obtained, which also includes:

[0264] If Q4≤Q min , then obtain the control parameters according to Q3.

[0265] That is, first determine whether the coolant flow rate Q1 required by the generator 31 and the coolant flow rate Q2 required by the first drive motor 32 are greater than the minimum coolant flow rate Q min , if Q1 and Q2 are not greater than the minimum coolant flow Q min , then continue to determine whether the coolant flow rate Q4 required by the second drive motor 34 is greater than the minimum coolant flow rate Q min If the coolant flow rate Q4 ≤ Q required by the second drive motor 34 min , then the control parameter is obtained according to Q3, that is, based on the coolant flow Q3 required by the first reduction box 33, the coolant flow Q required by the cooling and lubrication system is calculated.

[0266] Specifically, the control parameters are obtained according to Q3, including:

[0267] Q = max (Q3, Q min );k1=0;k2=k3=0。

[0268] It should be noted that Q= max (Q3, Q min ) means that the coolant flow Q required by the cooling and lubrication system is Q3 and Q min The maximum value in the equation, the opening degree k1 of the switch valve 213 is 0, that is, the switch valve 213 is in the closed state; k2=k3=0, that is, the regulating valve 40 is in the closed state.

[0269] In one embodiment, obtaining the control parameter according to Q3 includes:

[0270] Q = max (Q3, Q min)+ e4;k1=0;k2=k3=0;

[0271] Here, e4 represents the flow rate of coolant lost between the coolant main channel 10 and the first reduction box 33. In other words, this method corrects the coolant flow rate Q required by the cooling and lubrication system by adding the flow rate lost when the coolant is transported to the first reduction box 33.

[0272] It should be noted that e4 mentioned here represents the flow rate of coolant lost between the coolant main channel 10 and the first reduction box 33, which actually refers to the flow rate of coolant lost between the oil pump 14 and the first reduction box 33.

[0273] In a specific embodiment, please refer to Figure 3 , the control method of the cooling and lubrication system mainly includes the following steps:

[0274] Step S201: The vehicle is powered on;

[0275] Step S202: activating the cooling lubrication mode;

[0276] Step S203: obtaining the coolant flow required by each component of the electric drive system 30;

[0277] Step S204: Obtain the minimum coolant flow Q of the cooling and lubrication system min ;

[0278] Step S205: Determine whether Q1 or Q2 is greater than Q min ;

[0279] If yes, execute step S206; if no, execute step S207.

[0280] Step S206: Determine whether Q4 is greater than Qmin;

[0281] If yes, execute step S208; if no, execute step S209.

[0282] Step S207: Determine whether Q4 is greater than Qmin;

[0283] If yes, execute step S210; if no, execute step S211.

[0284] Step S208: Obtain control parameters according to Q1, Q2, Q3, Q4 and Q5;

[0285] Step S209: Obtain control parameters according to Q1, Q2 and Q3;

[0286] Step S210: Obtain control parameters according to Q4 and Q5;

[0287] Step S211: Obtain control parameters according to Q3.

[0288] In one embodiment, the control method further includes: if the vehicle is powered off, determining whether to activate the rear run cooling.

[0289] Specifically, if the vehicle is powered off, it is determined whether to activate the cooling function, including:

[0290] The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the generator 31, or the first drive motor 32, or the first reduction gearbox 33 at the current moment is Ta, and the corresponding temperature of the generator 31, or the first drive motor 32, or the first reduction gearbox 33 after t4 is Tb;

[0291] If Ta-Tb>T3, the temperature of the generator 31, the first drive motor 32, or the first reduction gearbox 33 is greater than T4 and less than T5, then a short post-operation cooling of the generator 31, the first drive motor 32, and the first reduction gearbox 33 is activated;

[0292] If Ta-Tb>T3, the temperature of the generator 31, the first drive motor 32, or the first reduction gearbox 33 is greater than T5, and long-term post-operation cooling of the generator 31, the first drive motor 32, and the first reduction gearbox 33 is activated.

[0293] Exemplarily, the value range of the fourth preset time t4 can be 0~1s, the value range of the third preset temperature T3 can be 0℃~30℃, the value range of the fourth preset temperature T4 can be 110℃~125℃, and the value range of the fifth preset temperature T5 can be 125℃~140℃.

[0294] It should be noted that Ta-Tb>T3 means that the condition is satisfied as long as the temperature difference of any one of the generator 31, the first drive motor 32 and the first reduction gearbox 33 within the fourth preset time t4 is greater than T3.

[0295] In one embodiment, if the vehicle is powered off, determining whether to activate the rear run cooling function includes:

[0296] The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the second drive motor 34 or the second reduction gearbox 35 at the current moment is Tc, and the corresponding temperature of the second drive motor 34 or the second reduction gearbox 35 after t4 is Td;

[0297] If Tc-Td>T3, the temperature of the second drive motor 34 or the second reduction gearbox 35 is greater than T4 and less than T5, then a short post-operation cooling of the second drive motor 34 and the second reduction gearbox 35 is activated;

[0298] If Tc-Td>T3, the temperature of the second drive motor 34 or the second reduction gearbox 35 is greater than T5, and long-term post-operation cooling of the second drive motor 34 and the second reduction gearbox 35 is activated.

[0299] It should be noted that Ta-Tb>T3 means that the condition is satisfied as long as the temperature difference of any one of the second drive motor 34 and the second reduction gearbox 35 is greater than T3 within the fourth preset time t4. In one embodiment, the control method further includes:

[0300] If the post-operation cooling of the generator 31, the first drive motor 32 and the first reduction gearbox 33 is activated, k1=1, k2=k3=0 are controlled, and the post-operation coolant flow Q required for the cooling lubrication system is afterrun =Qc;

[0301] If the post-operation cooling of the second drive motor 34 and the second reduction gearbox 35 is activated, k1=0, k2=0, k3=1 are controlled, and the post-operation coolant flow Q required for the cooling lubrication system is afterrun =Qc;

[0302] If the post-operation cooling of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35 is activated, k1=1, k2=k3=1 are controlled, and the post-operation coolant flow Q required for the cooling lubrication system is afterrun =2Qc.

[0303] Exemplarily, the value range of Qc may be 4 lpm to 6 lpm.

[0304] It should be noted that if the post-operation cooling is not activated, the output is the coolant flow Q required by the cooling and lubrication system, the opening k1 of the switch valve 213, and the control valve openings k2 and k3. If the post-operation cooling is activated, the output is the post-operation coolant flow Q. afterrun , the opening degree k1 of the switch valve 213, and the opening degrees k2 and k3 of the control valve.

[0305] It can be understood that if the post-operation cooling of the generator 31, the first drive motor 32 and the first reduction gearbox 33 is activated, it means that the front drive system of the electric drive system 30 is activated. At this time, k1=1, k2=k3=0 are controlled, and the post-operation coolant flow Q required for the cooling lubrication system is afterrun =Qc; If the post-operation cooling of the second drive motor 34 and the second reduction gearbox 35 is activated, it means activating the post-drive system of the electric drive system 30. At this time, k1=0, k2=0, k3=1 are controlled, and the post-operation coolant flow rate Q required for the cooling lubrication system is afterrun=Qc; If the post-operation cooling of the generator 31, the first drive motor 32, the first reduction gearbox 33, the second drive motor 34 and the second reduction gearbox 35 is activated, it means that the front drive system and the rear drive system of the electric drive system 30 are activated. At this time, k1=1, k2=k3=1 are controlled, and the post-operation coolant flow rate Q required for the cooling lubrication system is afterrun =2Qc.

[0306] In one embodiment, after the vehicle is powered on, the method further includes: activating the fan assembly 50. When the vehicle is powered on, the cooling fan assembly 50 may be activated. Initially, the air volume output by the fan assembly 50 is 0.

[0307] The cooling and lubrication system includes a fan assembly 50, which is used to cool the electric drive system 30. It is understood that when the temperature of the electric drive system 30 is very high, the fan assembly 50 and the coolant channel are used together to cool the electric drive system 30, thereby improving the cooling effect and protecting the components of the electric drive system 30 to the greatest extent.

[0308] For example, in one embodiment, the fan assembly 50 can cool the generator 31, first drive motor 32, and first reduction gearbox 33 of the front drive system. In other embodiments, the fan assembly 50 can also cool the second drive motor 34 and second reduction gearbox 35 of the rear drive system. In still other embodiments, the fan assembly 50 can also cool the MTCU 60.

[0309] In one embodiment, activating the fan assembly 50 includes:

[0310] If the temperature of the first reduction box 33 is greater than the sixth preset temperature T6 and less than or equal to the seventh preset temperature T7, the fan assembly 50 operates at a low windshield.

[0311] If the temperature of the first reduction box 33 is greater than the seventh preset temperature T7, the fan assembly 50 operates at a high wind speed.

[0312] For example, the sixth preset temperature T6 may be in the range of 110°C to 120°C, and the seventh preset temperature T7 may be in the range of 120°C to 130°C.

[0313] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0314] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. A cooling and lubrication system, characterized in that: include: Coolant main channel; An electric drive system, comprising a generator, a first drive motor and a first reduction gearbox; a cooling liquid sub-channel in communication with the cooling liquid main channel, the cooling liquid sub-channel including a first sub-channel having a first branch and a second branch, the first branch and the second branch both being in communication with the cooling liquid main channel, the cooling liquid from the cooling liquid main channel being capable of being delivered to the generator and the drive motor via the first branch to cool and lubricate the generator and the drive motor, and being delivered to the first reduction gearbox via the second branch to cool and lubricate the first reduction gearbox; The electric drive system includes a second drive motor and a second reduction gearbox; The cooling liquid sub-channel includes a second sub-channel connected in parallel with the first sub-channel, and the cooling liquid from the cooling liquid main channel can be transported to the second drive motor and the second reduction gearbox through the second sub-channel to cool and lubricate the second drive motor and the second reduction gearbox; The cooling and lubrication system includes a regulating valve, through which the coolant main channel is connected to the first sub-channel and the second sub-channel, and the regulating valve is used to adjust the opening of the first sub-channel and the second sub-channel.

2. The cooling and lubricating system according to claim 1, characterized in that: The regulating valve is a proportional valve.

3. The cooling and lubricating system according to claim 1, characterized in that: The first sub-channel includes a switch valve, and the switch valve is arranged on the first branch.

4. The cooling and lubrication system according to any one of claims 1 to 3, characterized in that: The cooling and lubrication system includes a fan assembly, which is used to cool the electric drive system.

5. The cooling and lubrication system according to any one of claims 1 to 3, characterized in that: The cooling and lubrication system includes an MTCU and at least one temperature sensor signal-connected to the MTCU; The temperature sensor is signal-connected to the generator; and / or, The temperature sensor is connected to the first drive motor signal; and / or, The temperature sensor is connected to the second drive motor signal; and / or, The temperature sensor is signal-connected to the coolant main channel.

6. The cooling and lubricating system according to any one of claims 1 to 3, characterized in that: The coolant main channel includes an oil pan, a cooling motor, a filter, an oil pump and a radiator. The oil inlet of the filter is connected to the oil pan, and the oil outlet of the filter is connected to the oil pump. The cooling motor drives the oil pump to deliver the coolant to the coolant sub-channel through the radiator.

7. A vehicle, characterized in that: A cooling and lubrication system comprising the cooling and lubrication system according to any one of claims 1 to 6.

8. A control method for a cooling and lubrication system, characterized in that: The cooling and lubrication system includes an electric drive system, a main coolant channel, and a first sub-channel and a second sub-channel arranged in parallel, the first sub-channel and the second sub-channel are both connected to the main coolant channel, the electric drive system includes a generator, a first drive motor, a first reduction gearbox, a second drive motor, and a second reduction gearbox, the coolant from the main coolant channel can be transported to the generator, the drive motor, and the first reduction gearbox through the first sub-channel and cool and lubricate the generator, the drive motor, and the first reduction gearbox, the coolant from the main coolant channel can be transported to the second drive motor and the second reduction gearbox through the second sub-channel and cool and lubricate the second drive motor and the second reduction gearbox, the cooling and lubrication system includes a regulating valve, the main coolant channel is connected to the first sub-channel and the second sub-channel through the regulating valve, the regulating valve is used to adjust the opening of the first sub-channel and the opening of the second sub-channel, the first sub-channel includes an on-off valve, and the control method includes: The vehicle is powered on; Activate cooling lubrication mode; Obtaining the coolant flow required by each component of the electric drive system; Get the minimum coolant flow Q of the cooling and lubrication system min ; Determine whether the coolant flow required by the generator or the first drive motor is greater than Q min ; According to the determination result, obtaining control parameters of the cooling and lubrication system; The control parameters include: The coolant flow rate Q required by the cooling and lubrication system; and / or, The opening degree k1 of the switch valve; and / or, The regulating valve corresponds to an opening degree k2 of the first sub-channel and an opening degree k3 of the second sub-channel.

9. The control method according to claim 8, characterized in that: The obtaining of the coolant flow required by each component of the electric drive system includes: The coolant flow rate Q1 required by the generator, the coolant flow rate Q2 required by the first drive motor, the coolant flow rate Q3 required by the first reduction gearbox, the coolant flow rate Q4 required by the second drive motor, and the coolant flow rate Q5 required by the second reduction gearbox are obtained.

10. The control method according to claim 9, characterized in that: The method for obtaining the coolant flow required by each component of the electric drive system includes: According to the temperatures of the generator, the first drive motor, the first reducer, the second drive motor and the second reducer, the coolant flow rate Q1′ required by the generator, the coolant flow rate Q2′ required by the first drive motor, the coolant flow rate Q3′ required by the first reducer, the coolant flow rate Q4′ required by the second drive motor and the coolant flow rate Q5′ required by the second reducer are obtained, then Q1= Q1′, Q2= Q2′, Q3= Q3′, Q4= Q4′, Q5= Q5′.

11. The control method according to claim 10, characterized in that: The method for obtaining the coolant flow required by each component of the electric drive system includes: According to the temperature difference between the generator and the first reduction gearbox, the temperature difference between the first drive motor and the first reduction gearbox, and the temperature difference between the second drive motor and the second reduction gearbox, the coolant flow rate Q1″ required by the generator, the coolant flow rate Q2″ required by the first drive motor, the coolant flow rate Q3″ required by the first reduction gearbox, the coolant flow rate Q4″ required by the second drive motor, and the coolant flow rate Q5″ required by the second reduction gearbox are obtained, then Q1= Q1″, Q2= Q2″, Q3= Q3″, Q4= Q4″, Q5= Q5″.

12. The control method according to claim 11, characterized in that: The method for obtaining the coolant flow required by each component of the electric drive system includes: If the first sub-channel and the second sub-channel are both connected to the coolant main channel, then Q1=max (Q1′, Q1″), Q2=max (Q2′, Q2″), Q3=max (Q3′, Q3″), Q4=max (Q4′, Q4″), Q5=max (Q5′, Q5″).

13. The control method according to claim 9, characterized in that: Get the minimum coolant flow Q min methods, including: According to the speed n1 of the generator, the speed n2 of the first drive motor, the speed n3 of the second drive motor and the minimum coolant flow Q3 required by the first reduction gearbox min And the minimum coolant flow rate required for the second reduction gearbox Q5 min , get the minimum coolant flow Q min .

14. The control method according to claim 13, characterized in that: The minimum coolant flow Q is obtained according to the speed n1 of the generator, the speed n2 of the first drive motor and the speed n3 of the second drive motor. min ,include: If n1>0, or n2>0, and n3=0, then Q min =Q3 min ; If n1=0, n2=0, and n3>0, then Q min =Q5 min ; If n1>0, n2>0, and n3>0, then Q min =max(Q3 min , Q5 min ).

15. The control method according to claim 13, characterized in that: According to n1, n2, n3 and Q3 min and Q5 min , get the minimum coolant flow Q min Before the steps, also include: According to the temperature of the first reduction gearbox and the second reduction gearbox, obtain Q3 min and Q5 min .

16. The control method according to claim 13, characterized in that: If the trigger condition of the minimum coolant flow rate is met, the control parameter meets the minimum coolant flow rate, and the trigger condition includes: Any one of n1, n2 and n3 is greater than the first preset speed N1, and after being greater than N1, is not less than the second preset speed N2 for the first preset time t1; and / or, Safety flow Q safe Activate; and / or, If the vehicle is powered on for a second preset time t2, the coolant temperature is greater than the first preset temperature T1; and / or, If the vehicle is in the Ready state for a third preset time t3, the coolant temperature is lower than the second preset temperature T2.

17. The control method according to claim 8, characterized in that: The control method further includes: Get the coolant flow limit Q of the cooling and lubrication system max , where Q≤Q max .

18. The control method according to claim 17, characterized in that: Get the coolant flow limit Q of the cooling and lubrication system max methods, including: According to the displacement V and maximum speed n of the cooling motor max Get the coolant flow limit Q of the cooling and lubrication system max , where Q max =V×n max / 1000.

19. The control method according to claim 8, characterized in that: The step of obtaining the control parameters of the cooling and lubrication system according to the determination result includes: If Q1>Q min , or Q2>Q min , then determine whether Q4 is greater than Q min ; If Q4≤Q min , then the control parameters are obtained according to Q1, Q2 and Q3.

20. The control method according to claim 19, characterized in that: The obtaining of the control parameters according to Q1, Q2, and Q3 includes: Q= max (Q1, Q2, Q3), k1=1, k2=1, k3=0.

21. The control method according to claim 19, characterized in that: The method for obtaining the control parameter according to Q1, Q2 and Q3 includes: Q = max (Q1, Q2, Q3)+e1; k1=1; k2=1; k3=0; Here, e1 represents the maximum value of the flow rate of the coolant lost between the coolant main channel and the generator, the flow rate lost between the coolant main channel and the first drive motor, and the flow rate lost between the coolant main channel and the first reduction gearbox.

22. The control method according to claim 19, characterized in that: The step of obtaining the control parameters of the cooling and lubrication system according to the determination result further includes: If Q4>Q min , then the control parameters are obtained according to Q1, Q2, Q3, Q4 and Q5.

23. The control method according to claim 22, characterized in that: The obtaining of the control parameters according to Q1, Q2, Q3, Q4, and Q5 includes: Q= max (Q1, Q2, Q3)+ max (Q4, Q5); k1=1; k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)); k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

24. The control method according to claim 22, characterized in that: The method for obtaining the control parameters according to Q1, Q2, Q3, Q4 and Q5 includes: Q= max (Q1, Q2, Q3)+ max (Q4, Q5)+ e2; k1=1; k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)); k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)); Among them, e2 represents the maximum value of the flow rate lost between the coolant main channel and the generator, the flow rate lost between the coolant and the first drive motor, the flow rate lost between the coolant and the first reduction gearbox, the flow rate lost between the coolant and the second drive motor, and the flow rate lost between the coolant and the second reduction gearbox.

25. The control method according to claim 8, characterized in that: The step of obtaining the control parameters of the cooling and lubrication system according to the determination result further includes: If Q1≤Q min And Q2≤Q min , then determine whether Q4 is greater than Q min ; If Q4>Q min , then obtain the control parameters according to Q4 and Q5.

26. The control method according to claim 25, characterized in that: The obtaining of the control parameters according to Q4 and Q5 includes: Q = max (Q4, Q5); k1 = 0; k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)); k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)).

27. The control method according to claim 25, characterized in that: The obtaining of the control parameters according to Q4 and Q5 includes: Q= max (Q4, Q5) + e3; k1 = 0; k2=max(Q1, Q2, Q3) / (max (Q1, Q2, Q3)+max(Q4, Q5)); k3=max(Q4, Q5) / (max(Q1, Q2, Q3)+max(Q4, Q5)); Here, e3 represents the maximum value of the flow rate lost between the coolant main channel and the second drive motor and the flow rate lost between the coolant main channel and the second reduction gearbox.

28. The control method according to claim 25, characterized in that: The step of obtaining the control parameters of the cooling and lubrication system according to the determination result further includes: If Q4≤Q min , then obtain the control parameters according to Q3.

29. The control method according to claim 28, characterized in that: The obtaining of the control parameter according to Q3 includes: Q= max (Q3,Q min ),k1=0,k2=k3=0。 30. The control method according to claim 29, characterized in that: The method for obtaining the control parameter according to Q3 includes: Q= max (Q3, Q min )+ e4;k1=0;k2=k3=0; Wherein, e4 represents the flow rate of the coolant lost between the coolant main channel and the first reduction gearbox.

31. The control method according to claim 9, characterized in that: The control method further includes: If the vehicle is powered off, determine whether to activate the cooling function.

32. The control method according to claim 31, characterized in that: If the vehicle is powered off, determining whether to activate the cooling function includes: The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the generator, the first drive motor, or the first reduction gearbox at the current moment is Ta, and the temperature of the generator, the first drive motor, or the first reduction gearbox after t4 is Tb; If Ta-Tb>T3, the temperature of the generator, the first drive motor, or the first reduction gearbox is greater than T4 and less than T5, then a short post-operation cooling of the generator, the first drive motor, and the first reduction gearbox is activated; If Ta-Tb>T3, the temperature of the generator, the first drive motor, or the first reduction gearbox is greater than T5, and long-term post-operation cooling of the generator, the first drive motor, and the first reduction gearbox is activated.

33. The control method according to claim 31, characterized in that: If the vehicle is powered off, determining whether to activate the cooling function includes: The third preset temperature is T3, the fourth preset temperature is T4, the fifth preset temperature is T5, the fourth preset time is t4, the temperature of the second drive motor or the second reduction gearbox at the current moment is Ta, and the corresponding temperature of the second drive motor or the second reduction gearbox after t4 is Tb; If Tc-Td>T3, and the temperature of the second drive motor or the second reduction gearbox is greater than T4 and less than T5, a short post-operation cooling of the second drive motor and the second reduction gearbox is activated; If Tc-Td>T3, the temperature of the second drive motor or the second reduction gearbox is greater than T5, and the long-term post-operation cooling of the second drive motor and the second reduction gearbox is activated.

34. The control method according to claim 31, characterized in that: The control method further includes: If the post-operation cooling of the generator, the first drive motor and the first reduction gearbox is activated, k1=1, k2=k3=0 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =Qc; If the post-operation cooling of the second drive motor and the second reduction gearbox is activated, k1=0, k2=0, k3=1 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =Qc; If the post-operation cooling of the generator, the first drive motor, the first reduction gearbox, the second drive motor and the second reduction gearbox is activated, k1=1, k2=k3=1 are controlled, and the post-operation coolant flow rate Q required by the cooling lubrication system is afterrun =2Qc.

35. The control method according to claim 9, characterized in that: After the step of powering on the vehicle, the method further includes: activating the fan assembly.

36. The control method according to claim 35, characterized in that: The activation fan assembly comprises: If the temperature of the first reduction gearbox is greater than the sixth preset temperature T6 and less than or equal to the seventh preset temperature T7, the fan assembly operates at a low windshield; If the temperature of the first reduction gearbox is greater than the seventh preset temperature T7, the fan assembly operates at a high wind speed.

Images