Hydraulic system and vehicle

Abstract

The utility model discloses a hydraulic system and a vehicle, relates to the technical field of vehicles, and aims to solve the problem that power is consumed when oil is heated to a normal working temperature due to the fact that oil is subjected to heat exchange through a heat exchanger at a low temperature. The utility model provides a hydraulic system which comprises a first oil way used for cooling an electric drive assembly of a vehicle. The first oil way comprises a first oil pump, a reversing valve, an electric drive assembly and a heat exchanger, an outlet of the first oil pump is connected with an inlet of the reversing valve, an outlet of the reversing valve is connected with a first flow channel and a second flow channel, the first flow channel and the second flow channel are connected in parallel, and outlets of the first flow channel and the second flow channel communicate with the electric drive assembly. According to the hydraulic system, due to the fact that the reversing valve is arranged, the oil can selectively pass through the heat exchanger, power loss caused by the fact that the temperature of the oil rises too slowly is avoided, and the working efficiency of the electric drive assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a hydraulic system and a vehicle. Background Art

[0002] As people pay more and more attention to environmental protection and low carbon, the pace of development of new energy vehicles has also accelerated significantly. The integration of automobiles with related technologies in the fields of energy, transportation, information and communications has accelerated, and electrification, networking and intelligence have become the development trend of the automobile industry. New technologies for new energy vehicles have sprung up, for example:

[0003] The application number is CN202410658157.7, the publication number is CN118238797B, and the invention name is New Energy Vehicle Energy Intelligent Management System, Control Method and Related Equipment;

[0004] The application number is CN202410672579.X, the publication number is CN118597091A, and the invention name is "New Energy Vehicle Energy Intelligent Management Method, System and Related Equipment";

[0005] The application number is 202410669449.0, and the invention name is New Energy Vehicle Energy Intelligent Management System, Control Method and Related Equipment;

[0006] They all describe hybrid technology that is mainly electric, and has multiple advantages such as being fast, economical, quiet, smooth, and green.

[0007] The application number is CN202211678720.4, the publication number is CN117382629B, and the invention name is vehicle power control method, device, medium, vehicle controller and vehicle;

[0008] The application number is CN202311164098.X, the publication number is CN116890770B, and the invention name is vehicle control system, method and vehicle;

[0009] The application number is CN202311170393.6, the publication number is CN117533292B, and the invention name is vehicle control system, control method, controller and vehicle;

[0010] Both describe a new energy power system with four wheel-side motors independently driven as the core, which greatly improves the safety and power of new energy vehicles.

[0011] However, in the prior art, when cooling the hydraulic system of the electric drive assembly, all the oil will be cooled by the heat exchanger. Sometimes, the temperature of the oil is low and still needs to be cooled by the heat exchanger. When the oil enters the electric drive assembly, the oil needs to be heated to the normal working temperature. After the oil is cooled, the heating speed slows down, resulting in increased power loss. Utility Model Content

[0012] The utility model aims to provide a hydraulic system and a vehicle, aiming to solve the problem that the oil consumes power when it is heated to the normal operating temperature because the oil is still heated through a heat exchanger at a low temperature.

[0013] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0014] On the one hand, the utility model provides a hydraulic system, including: a first oil circuit, the first oil circuit is used to cool the electric drive assembly of the vehicle; the first oil circuit includes: a first oil pump, a reversing valve, an electric drive assembly and a heat exchanger, the outlet of the first oil pump is connected to the inlet of the reversing valve, the outlet of the reversing valve is respectively connected to the first flow channel and the second flow channel, the first flow channel and the second flow channel are connected in parallel and the outlets of the first flow channel and the second flow channel are both connected to the electric drive assembly, and the heat exchanger is arranged in the first flow channel and is used to exchange heat with the oil passing through the first flow channel.

[0015] According to the hydraulic system of the utility model, the reversing valve is provided so that the oil can selectively pass through the heat exchanger. Thus, compared with the traditional hydraulic system, the power loss caused by the slow temperature rise of the oil is avoided, and the working efficiency of the electric drive assembly is improved.

[0016] In some embodiments, the hydraulic system further includes a first working mode. When the hydraulic system is in the first working mode, the reversing valve selectively controls oil to enter the first flow channel or the second flow channel.

[0017] In some embodiments, when the hydraulic system is in the first operating mode and the temperature of the oil is less than or equal to the first preset temperature, the reversing valve controls the oil to enter the second flow channel, and the oil flows to the electric drive assembly after passing through the second flow channel; when the temperature of the oil is greater than the first preset temperature, the reversing valve controls the oil to enter the first flow channel, and the oil flows to the electric drive assembly after passing through the first flow channel and exchanging heat with the heat exchanger.

[0018] In some embodiments, the first preset temperature h satisfies h≤0°C.

[0019] In some embodiments, the hydraulic system also includes a filter press disposed on the first flow channel, the inlet of the filter press is connected to the outlet of the heat exchanger, the outlet of the filter press is connected to the electric drive assembly, and the filter press is used to filter and / or pressurize the oil in the first flow channel.

[0020] In some embodiments, the first oil circuit further includes a suction filter, the outlet of the suction filter is connected to the first oil pump, the suction filter is used to filter the oil, and the oil flows to the first oil pump and the reversing valve after passing through the suction filter.

[0021] In some embodiments, the first oil circuit also includes a first control valve, the inlet of the first control valve is connected to the outlet of the first oil pump, and the outlet of the first control valve is connected to the inlet of the reversing valve, wherein the oil passing through the first control valve only flows from the inlet of the first control valve to the outlet of the first control valve.

[0022] In some embodiments, the hydraulic system further includes: a second oil pump, the inlet of the second oil pump is connected to the outlet of the suction filter, and the second oil pump is used to increase the pressure of the oil; a clutch, the outlet of the second oil pump is connected to the clutch, and the second oil pump is used to control the engagement and disengagement of the clutch.

[0023] In some embodiments, the hydraulic system also includes: a second oil circuit, the second oil circuit includes a second oil pump, a clutch and a second control valve, the inlet of the second control valve is connected to the outlet of the second oil pump, the outlet of the second control valve is connected to the clutch, and the second oil circuit is used to control the engagement and disengagement of the clutch.

[0024] In some embodiments, the second oil circuit also includes a first pressure regulating valve, the inlet of the first pressure regulating valve is connected to the outlet of the second oil pump, the outlet of the first pressure regulating valve is connected to the inlet of the reversing valve, the first pressure regulating valve is used to adjust the pressure of the oil, and is used as a channel to allow the oil in the second oil circuit to enter the first oil circuit.

[0025] In some embodiments, the second oil circuit also includes a second pressure regulating valve (3-pilot proportional solenoid valve), the inlet of the second pressure regulating valve is connected to the outlet of the second oil pump, and the second pressure regulating valve cooperates with the first pressure regulating valve to control the pressure of the oil in the second oil circuit.

[0026] In some embodiments, the first flow channel includes a first sub-flow channel and a second sub-flow channel, and the first sub-flow channel and the second sub-flow channel are connected in parallel; a heat exchanger and a filter press are provided on the first sub-flow channel, and a bypass valve is provided on the second sub-flow channel, and the bypass valve is used to adjust the flow rate of oil in the first sub-flow channel.

[0027] In some embodiments, the inlet of the bypass valve is connected to the outlet of the reversing valve, and the outlet of the bypass valve is connected to the electric drive assembly; the bypass valve is in a normally closed state, and when the oil reaches the set pressure of the bypass valve, the bypass valve opens under the action of the oil pressure, allowing the oil to pass through the second sub-flow channel, and the oil flows into the electric drive assembly after passing through the bypass valve.

[0028] In some embodiments, the second oil circuit also includes a first buffer and a second buffer, the inlet of the first buffer is connected to the outlet of the second oil pump, and the inlet of the second buffer is connected to the outlet of the second control valve; the first buffer and the second buffer are used to improve the pressure of the oil when the pressure of the oil is too high.

[0029] In some embodiments, the first oil circuit also includes a fourth flow channel and a fifth flow channel, both of which are connected to the first flow channel and the second flow channel, and the fourth flow channel and the fifth flow channel are connected in parallel; a third control valve is provided on the fourth flow channel, and the third control valve is connected between the first flow channel and the second flow channel and the rotor of the driving motor; a fourth control valve is provided on the fifth flow channel, and the fourth control valve is connected between the first flow channel and the second flow channel and the stator of the generator.

[0030] In some embodiments, the first oil circuit also includes an overflow valve, the opening of the overflow valve is connected to the outlet of the first oil pump, and the outlet of the overflow valve is connected to the outlet of the suction filter; the overflow valve is in a normally closed state, and when the flow rate of the oil is greater than the set flow rate of the overflow valve, the overflow valve opens under the action of the oil, and the oil flows back to the suction filter through the overflow valve.

[0031] In some embodiments, the electric drive assembly includes: a clutch; a generator; a drive motor, the generator supplies power to the drive motor; the hydraulic system includes a first oil circuit and a second oil circuit, the first oil circuit is used to cool and lubricate the generator, the drive motor and the clutch, and the second oil circuit is used to control the engagement and disengagement of the clutch.

[0032] On the other hand, the utility model provides a vehicle, comprising: the hydraulic system as above.

[0033] It can be understood that the beneficial effects that can be achieved by the hydraulic system and vehicle provided by the above embodiments of the present invention can refer to the beneficial effects of the hydraulic system of the transmission mentioned above, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a hydraulic system provided according to some embodiments in a first working mode;

[0036] Figure 2 A schematic diagram of a hydraulic system in a second working mode according to some embodiments;

[0037] Figure 3 Schematic diagram of a hydraulic system in a third working mode according to some embodiments.

[0038] Reference numerals:

[0039] 100. Hydraulic system;

[0040] 101, first oil circuit; 1, first oil pump; 2, reversing valve; 3, electric drive assembly; 4, heat exchanger; 5, first flow channel; 51, first sub-flow channel; 52, second sub-flow channel; 521, bypass valve; 6, second flow channel; 7, filter press; 8, suction filter; 9, first control valve; 11, fourth flow channel; 111, third control valve; 12, fifth flow channel; 121, fourth control valve; 13, overflow valve; 14, generator; 15, drive motor; 102, second oil circuit; 10, second oil pump; 20, clutch; 30, second control valve; 40, first pressure regulating valve; 50, second pressure regulating valve; 60, first buffer; 70, second buffer; 80, third buffer; 90, safety valve. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0042] In the description of the present disclosure, it is necessary to understand that the terms "center", "upper", "lower", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0043] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "exemplarily" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0044] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0045] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0046] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0047] On the one hand, if Figure 1-Figure 3 As shown, the utility model provides a hydraulic system 100, including a first oil circuit 101, and the first oil circuit 101 is used to cool the electric drive assembly 3 of the vehicle. The first oil circuit 101 includes a first oil pump 1, a reversing valve 2, the electric drive assembly 3 and a heat exchanger 4, the outlet of the first oil pump 1 is connected to the inlet of the reversing valve 2, the outlet of the reversing valve 2 is respectively connected to the first flow channel 5 and the second flow channel 6, the first flow channel 5 and the second flow channel 6 are connected in parallel, and the outlets of the first flow channel 5 and the second flow channel 6 are both connected to the electric drive assembly 3, and the heat exchanger 4 is arranged in the first flow channel 5 and is used to exchange heat with the oil passing through the first flow channel 5.

[0048] For example, in Figure 1 In the example, the oil flows in the first oil circuit 101 so that the oil can flow to the electric drive assembly 3 to cool the electric drive assembly 3.

[0049] The flow path of the oil in the first oil circuit 101 is: the oil flows out from the first oil pump 1, the oil passes through the reversing valve 2 after passing through the first oil pump 1, the reversing valve 2 controls the oil to enter the first flow channel 5 or the second flow channel 6, and the oil flows to the drive assembly after passing through the first flow channel 5 or the second flow channel 6.

[0050] The reversing valve 2 controls the oil to flow to the first flow channel 5 or the second flow channel 6. When the oil needs to be cooled, the reversing valve 2 controls the oil to enter the first flow channel 5, so that the oil passes through the heat exchanger 4 in the first flow channel 5 for heat exchange to reduce the temperature of the oil. After the oil enters the electric drive assembly 3, the electric drive assembly 3 can be cooled to reduce the temperature of the electric drive assembly 3, thereby realizing cooling of the electric drive assembly 3.

[0051] When the temperature of the oil does not need to be cooled, the reversing valve 2 controls the oil to enter the second flow channel 6 so that the oil can directly enter the electric drive assembly 3 through the second flow channel 6 to cool the electric drive assembly 3.

[0052] With such arrangement, the oil no longer passes through the heat exchanger 4 when it is at a low temperature. When the oil reaches the electric drive assembly 3, the oil is at a normal operating temperature and can work normally without waiting for the oil to heat up. This can avoid power loss caused by too slow oil heating, thereby improving the working efficiency of the electric drive assembly 3.

[0053] According to the hydraulic system 100 of the utility model, the reversing valve 2 is provided so that the oil can selectively pass through the heat exchanger 4. Therefore, compared with the traditional hydraulic system, the power loss caused by the slow temperature rise of the oil is avoided, and the working efficiency of the electric drive assembly 3 is improved.

[0054] In some embodiments, the hydraulic system 100 further includes a first working mode. When the hydraulic system 100 is in the first working mode, the reversing valve 2 selectively controls the oil to enter the first flow channel 5 or the second flow channel 6 .

[0055] Reference Figure 1 When only the generator 14 of the electric drive assembly 3 is working, the hydraulic system 100 is in the first working mode. At this time, the vehicle is not moving, so the oil only needs to cool the generator 14. When the oil passes through the reversing valve 2, the reversing valve 2 controls the oil to enter the first flow channel 5 or the second flow channel 6 according to the temperature of the oil, so that the oil can pass through the heat exchanger 4 or does not need to pass through the heat exchanger 4, thereby achieving the cooling of the generator 14 by the oil and reducing power consumption.

[0056] Furthermore, when the hydraulic system 100 is in the first working mode and the temperature of the oil is less than or equal to the first preset temperature, the reversing valve 2 controls the oil to enter the second flow channel 6, and the oil flows to the electric drive assembly 3 after passing through the second flow channel 6; when the temperature of the oil is greater than the first preset temperature, the reversing valve 2 controls the oil to enter the first flow channel 5, and the oil flows to the electric drive assembly 3 after passing through the first flow channel 5 and exchanging heat with the heat exchanger 4.

[0057] like Figure 1As shown, a temperature sensor is provided in the reversing valve 2, and the temperature sensor can detect the temperature of the oil. When the oil passes through the reversing valve 2, the temperature sensor detects whether the temperature of the oil exceeds the first preset temperature. When the oil exceeds the first preset temperature, the reversing valve 2 controls the oil to enter the first flow channel 5, so that the oil passes through the heat exchanger 4 for heat exchange, and the oil enters the electric drive assembly 3 after cooling, so that the electric drive assembly 3 can be cooled. When the temperature sensor detects that the temperature of the oil is lower than the first preset temperature, the oil does not need to pass through the heat exchanger 4 for heat exchange. The reversing valve 2 controls the oil to enter the second flow channel 6, and the oil can directly reach the electric drive assembly 3 through the second flow channel 6, thereby avoiding the oil from exchanging heat in the heat exchanger 4, avoiding power loss when the oil is heated, reducing the power loss of the hydraulic system 100, and helping to improve the working efficiency of the hydraulic system 100.

[0058] Furthermore, the first preset temperature h satisfies h≤0°C. When the oil passes through the reversing valve 2 and the temperature of the oil is h≤0°C, the temperature of the oil is relatively low and does not need to be heat exchanged through the heat exchanger 4, and can flow directly to the electric drive assembly 3 through the second flow channel 6. When the temperature of the oil h>0°C, the oil can flow to the heat exchanger 4 through the first flow channel 5 for heat exchange, so that the temperature of the oil is reduced, which is convenient for the oil to be cooled in the electric drive assembly 3.

[0059] Such a configuration can avoid the oil temperature being low after heat exchange, avoid power consumption of the hydraulic system 100 , and help improve the working efficiency of the hydraulic system 100 .

[0060] In some embodiments, the hydraulic system 100 also includes a filter press 7 arranged on the first flow channel 5, the inlet of the filter press 7 is connected to the outlet of the heat exchanger 4, and the outlet of the filter press 7 is connected to the electric drive assembly 3, and the filter press 7 is used to filter and / or pressurize the oil in the first flow channel 5.

[0061] Reference Figure 1 , the filter press 7 pressurizes and / or filters the oil. After the oil passes through the heat exchanger 4, the oil cools down and the pressure of the oil decreases. The filter press 7 pressurizes the oil so that the oil can flow smoothly in the first flow channel 5. The filter press 7 can also filter the oil so that the impurities carried by the oil in the process of flowing in the first oil circuit 101 are filtered to prevent blockage in the first oil circuit 101. In this way, the oil can flow smoothly in the first flow channel 5, and the oil can flow to the electric drive assembly 3 to achieve cooling of the electric drive assembly 3.

[0062] In some embodiments, the first oil circuit 101 further includes a suction filter 8 , the outlet of the suction filter 8 is connected to the first oil pump 1 , the suction filter 8 is used to filter the oil, and the oil flows to the first oil pump 1 and the reversing valve 2 after passing through the suction filter 8 .

[0063] For example, in Figure 1In the example, the oil enters the first oil pump 1 through the suction filter 8. The suction filter 8 filters the oil to separate the impurities in the oil from the oil. After passing through the suction filter 8, the oil enters the first oil circuit 101 and flows into the first oil pump 1. The first oil pump 1 provides sufficient power for the flow of the oil so that the oil can continue to flow to the reversing valve 2. This arrangement allows the oil to smoothly enter the first oil circuit 101, allowing the oil to flow in the first oil circuit 101, and facilitates the oil in the first oil circuit 101 to cool the electric drive assembly 3.

[0064] In some embodiments, the first oil circuit 101 further includes a first control valve 9, the inlet of the first control valve 9 is connected to the outlet of the first oil pump 1, and the outlet of the first control valve 9 is connected to the inlet of the reversing valve 2, wherein the oil passing through the first control valve 9 only flows from the inlet of the first control valve 9 to the outlet of the first control valve 9. Figure 1 , the oil passes through the first oil pump 1 and then the first control valve 9, and then the oil enters the reversing valve 2 after passing through the first control valve 9. The first control valve 9 is a one-way valve, which only allows the oil to flow from the inlet of the first control valve 9 to the outlet of the first control valve 9, and cannot allow the oil to flow from the outlet of the first control valve 9 to the inlet of the first control valve 9. Therefore, when the oil flows in the first oil circuit 101, the oil can only flow from the first oil pump 1 to the reversing valve 2, and cannot flow from the reversing valve 2 to the first oil pump 1. This arrangement ensures that the oil can flow normally in the first oil circuit 101, and avoids the oil from looping and affecting the cooling work of the oil.

[0065] For example, in Figure 2 In some embodiments, the hydraulic system 100 further includes a second oil pump 10 and a clutch 20. The inlet of the second oil pump 10 is connected to the outlet of the suction filter 8, and the second oil pump 10 is used to increase the pressure of the oil. The outlet of the second oil pump 10 is connected to the clutch 20, and the second oil pump 10 is used to control the engagement and disengagement of the clutch 20.

[0066] After passing through the suction filter 8, the oil can also flow to the second oil pump 10, which can increase the pressure of the oil so that the oil can flow smoothly. The oil can flow to the clutch 20 through the second oil pump 10, and the engagement and disengagement of the clutch 20 can be controlled by such a configuration.

[0067] The second oil pump 10 is used to build pressure for the hydraulic system 100, improve the vehicle's operating ability under low speed conditions, reduce oil churning losses of the electric drive assembly 3, and save costs. At the same time, the first oil pump 1 and the second oil pump 10 realize a dual electronic oil pump structure, and the first oil pump 1 and the second oil pump 10 jointly control the cooling of the hydraulic system 100.

[0068] In some embodiments, the hydraulic system 100 also includes a second oil circuit 102, which includes a second oil pump 10, a clutch 20 and a second control valve 30. The inlet of the second control valve 30 is connected to the outlet of the second oil pump 10, and the outlet of the second control valve 30 is connected to the clutch 20. The second oil circuit 102 is used to control the engagement and disengagement of the clutch 20.

[0069] like Figure 2 As shown, the path of the oil in the second oil circuit 102 is: the oil enters the second control valve 30 through the second oil pump 10, and the oil flows to the clutch 20 after passing through the second control valve 30 to control the engagement and disengagement of the clutch 20. The second control valve 30 can adjust the pressure of the oil, so that when the oil flows to the clutch 20, it can control the engagement and disengagement of the clutch 20. In this way, the clutch 20 can be hydraulically controlled, and the working efficiency of the clutch 20 is improved.

[0070] In some embodiments, the second oil circuit 102 also includes a first pressure regulating valve 40, the inlet of the first pressure regulating valve 40 is connected to the outlet of the second oil pump 10, and the outlet of the first pressure regulating valve 40 is connected to the inlet of the reversing valve 2. The first pressure regulating valve 40 is used to adjust the pressure of the oil and is used as a channel to allow the oil in the second oil circuit 102 to enter the first oil circuit 101.

[0071] Reference Figure 2 , the oil flows into the second control valve 30 and the first pressure regulating valve 40 respectively after passing through the second oil pump 10. The first pressure regulating valve 40 can adjust the pressure of the oil, and can also serve as a channel to connect the first oil circuit 101 with the second oil circuit 102. Among them, the first pressure regulating valve 40 has a first end connected to the inlet of the second oil pump 10 and a second end connected to the inlet of the reversing valve 2, so that the oil can flow between the first oil circuit 101 and the second oil circuit 102 through the first end and the second end. The first pressure regulating valve 40 also has a third end connected to the inlet of the second oil pump 10 and a fourth end connected to the outlet of the second pressure regulating valve 50. The third end and the fourth end are used to detect the pressure of the oil so that the first pressure regulating valve 40 can adjust the pressure of the oil.

[0072] When the first pressure regulating valve 40 is opened as a channel, the oil can enter the first oil circuit 101 through the first pressure regulating valve 40, and merge with the oil flowing out of the first control valve 9, and enter the reversing valve 2 together. In this way, the hydraulic system 100 can work normally, and the cooling function of the first oil circuit 101 and the control function of the second oil circuit 102 can be realized.

[0073] Compared with the traditional hydraulic system, the one-way valve between the first pressure regulating valve 40 and the reversing valve 2 is removed, the redundancy of the one-way valve is optimized, the cost is saved, and it is beneficial to the structural arrangement of the hydraulic system 100 .

[0074] Furthermore, the second oil circuit 102 also includes a second pressure regulating valve 50 , the inlet of the second pressure regulating valve 50 is connected to the outlet of the second oil pump 10 , and the second pressure regulating valve 50 cooperates with the first pressure regulating valve 40 to control the pressure of the oil in the second oil circuit 102 .

[0075] For example, in Figure 1 In the example, after the oil flows out of the second oil pump 10, it can enter the first pressure regulating valve 40 and the second pressure regulating valve 50 respectively. The second pressure regulating valve 50 can also control the pressure of the oil. By coordinating with the first pressure regulating valve 40 to control the pressure of the oil, the oil can flow smoothly in the second oil circuit 102, so that the oil can flow from the second oil pump 10 to the clutch 20, ensuring that the second oil circuit 102 can control the engagement and disengagement of the clutch 20.

[0076] like Figure 2 As shown, when the hydraulic system 100 is in the second working mode, the engine needs to output torque and the engine works.

[0077] The path of the oil in the second oil circuit 102 is: the oil flows into the inlet end of the second pressure regulating valve 50, the inlet end of the first pressure regulating valve 40, and the inlet end of the second control valve 30 through the second oil pump 10. The second pressure regulating valve 50 is opened after being energized, and the oil begins to build pressure. The second pressure regulating valve 50 moves to the second position, and part of the oil flows to the first oil circuit 101 through the outlet end of the first pressure regulating valve 40. When the pressure build-up of the first pressure regulating valve 40 and the second pressure regulating valve 50 reaches the clutch 20 engagement target pressure, the second control valve 30 is energized to open and move to the second position, and the oil flows into the clutch 20 through the outlet end of the second control valve 30, so as to control the clutch 20 to engage.

[0078] The path of the oil in the first oil circuit 101 is as follows: after the oil passes through the first oil pump 1, the oil passes through the first control valve 9 and merges with the oil in the second oil circuit 102 that passes through the first pressure regulating valve 40, and then the oil enters the inlet end of the reversing valve 2 together, and then the flow direction of the oil is determined by the temperature detection of the reversing valve 2. When the oil needs to be cooled, the oil enters the first flow channel 5, and the oil passes through the heat exchanger 4 and the filter press 7 in sequence before reaching the electric drive assembly 3, providing cooling and lubrication flow for the electric drive assembly 3.

[0079] When the oil does not need to be cooled, the reversing valve 2 controls the oil to enter the second flow channel 6 , and the oil directly enters the electric drive assembly 3 through the second flow channel 6 to cool the electric drive assembly 3 .

[0080] In summary, the first oil circuit 101 and the second oil circuit 102 can successfully complete the work and improve the work efficiency.

[0081] like Figure 3 As shown, when the hydraulic system 100 is in the third working mode, the engine, the generator 14 and other components all work simultaneously, and the components do not interfere with each other.

[0082] The oil flows into the inlet of the first pressure regulating valve 40 through the second oil pump 10 in the second oil circuit 102. At this time, the second control valve 30 is not connected to the clutch 20, and the second control valve 30 is closed. The second pressure regulating valve 50 is closed. The oil flows to the first oil circuit 101 through the outlet of the first pressure regulating valve 40. At this time, the oil in the first oil circuit 101 and the oil from the second oil circuit 102 merge at the inlet of the reversing valve 2, and then the oil enters the inlet of the reversing valve 2 together, and then the flow direction of the oil is determined by the temperature detection of the reversing valve 2. When the oil needs to be cooled, the oil enters the first flow channel 5, and the oil passes through the heat exchanger 4 and the filter press 7 in turn to reach the electric drive assembly 3, providing cooling and lubrication flow for the electric drive assembly 3. When the oil does not need to be cooled, the reversing valve 2 controls the oil to enter the second flow channel 6, and the oil directly enters the electric drive assembly 3 through the second flow channel 6 to cool the electric drive assembly 3.

[0083] Such configuration enables the hydraulic system 100 to work normally in the third working mode, thereby improving the working efficiency of the hydraulic system 100.

[0084] In some embodiments, the first flow channel 5 includes a first sub-flow channel 51 and a second sub-flow channel 52, and the first sub-flow channel 51 and the second sub-flow channel 52 are connected in parallel. The first sub-flow channel 51 is provided with a heat exchanger 4 and a filter press 7, and the second sub-flow channel 52 is provided with a bypass valve 521, which is used to adjust the flow rate of the oil in the first sub-flow channel 51.

[0085] like Figure 1 As shown, after the oil enters the first flow channel 5, it can also enter the first sub-flow channel 51 or the second sub-flow channel 52. The heat exchanger 4 in the first sub-flow channel 51 can perform heat exchange for the oil to reduce the temperature of the oil, and the oil can be filtered and pressurized by the filter press 7, so that the impurities in the oil can be filtered and the oil can flow smoothly in the first sub-flow channel 51. When the pressure of the oil is too high, the oil passing through the heat exchanger 4 and the filter press 7 will cause damage to the heat exchanger 4 and the suction filter 8. Therefore, a bypass valve 521 is provided on the second sub-flow channel 52, so that the oil directly enters the second sub-flow channel 52 and passes through the bypass valve 521 when the pressure is too high, so that the oil does not pass through the heat exchanger 4 and the filter press 7, so as to protect the heat exchanger 4 and the filter press 7 and extend the service life of the heat exchanger 4 and the filter press 7.

[0086] Reference Figure 1, further, the inlet of the bypass valve 521 is connected to the outlet of the reversing valve 2, and the outlet of the bypass valve 521 is connected to the electric drive assembly 3. The bypass valve 521 is in a normally closed state. When the oil reaches the set pressure of the bypass valve 521, the bypass valve 521 opens under the action of the oil pressure, allowing the oil to pass through the second sub-flow channel 52, and the oil flows into the electric drive assembly 3 after passing through the bypass valve 521. When the pressure of the oil in the first flow channel 5 is greater than or equal to 500kpa, the pressure of the oil can open the bypass valve 521. At this time, the oil enters the second sub-flow channel 52, allowing the oil to flow into the electric drive assembly 3 after passing through the bypass valve 521. When the pressure of the oil in the first flow channel 5 is less than 500 kPa, the oil can enter the first sub-flow channel 51, so that the oil can flow into the heat exchanger 4 and the filter press 7. After the oil is cooled by heat exchange in the heat exchanger 4 and pressurized and filtered by the filter press 7, it enters the electric drive assembly 3 for cooling. In this way, the heat exchanger 4 and the filter press 7 are protected and their service life is extended.

[0087] like Figure 2 As shown, when the hydraulic system 100 is in the second working mode, the engine needs to output torque and the engine works.

[0088] The path of the oil in the second oil circuit 102 is: the oil flows into the inlet end of the second pressure regulating valve 50, the inlet end of the first pressure regulating valve 40, and the inlet end of the second control valve 30 through the second oil pump 10. The second pressure regulating valve 50 is opened after being energized, and the oil begins to build pressure. The second pressure regulating valve 50 moves to the second position, and part of the oil flows to the first oil circuit 101 through the outlet end of the first pressure regulating valve 40. When the pressure build-up of the first pressure regulating valve 40 and the second pressure regulating valve 50 reaches the clutch 20 engagement target pressure, the second control valve 30 is energized to open and move to the second position, and the oil flows into the clutch 20 through the outlet end of the second control valve 30, so as to control the clutch 20 to engage.

[0089] The path of the oil in the first oil circuit 101 is as follows: after the oil passes through the first oil pump 1, the oil passes through the first control valve 9 and merges with the oil in the second oil circuit 102 that passes through the first pressure regulating valve 40, and then the oil enters the inlet end of the reversing valve 2 together, and then the flow direction of the oil is determined by the temperature detection of the reversing valve 2. When the oil needs to be cooled, the oil enters the first flow channel 5. When the pressure of the oil is not enough to reach the opening pressure of the bypass valve 521, the oil enters the first sub-flow channel 51, and the oil passes through the heat exchanger 4 and the filter press 7 in turn to reach the electric drive assembly 3, providing cooling and lubricating flow for the electric drive assembly 3. When the pressure of the oil reaches the opening pressure of the bypass valve 521, the bypass valve 521 opens, allowing the oil to flow to the electric drive assembly 3 through the bypass valve 521, providing cooling and lubricating flow for the electric drive assembly 3.

[0090] When the oil does not need to be cooled, the reversing valve 2 controls the oil to enter the second flow channel 6 , and the oil directly enters the electric drive assembly 3 through the second flow channel 6 to cool the electric drive assembly 3 .

[0091] In some embodiments, the second oil circuit 102 further includes a first buffer 60 and a second buffer 70, wherein the inlet of the first buffer 60 is connected to the outlet of the second oil pump 10, and the inlet of the second buffer 70 is connected to the outlet of the second control valve 30. The first buffer 60 and the second buffer 70 are used to improve the pressure of the oil when the pressure of the oil is too high.

[0092] For example, in Figure 2 In the example, after passing through the second oil pump 10, the oil can enter the first buffer 60, the second control valve 30, the first pressure regulating valve 40 and the second pressure regulating valve 50 respectively. The first buffer 60 is located between the second oil pump 10 and the first pressure regulating valve 40. After passing through the second control valve 30, the oil can enter the second buffer 70. Both the first buffer 60 and the second buffer 70 can improve the fluctuation of the oil under pressure, so that the oil can flow normally in the second oil circuit 102, thereby improving work efficiency.

[0093] In some embodiments, the first oil circuit 101 further includes a fourth flow channel 11 and a fifth flow channel 12, both of which are connected to the first flow channel 5 and the second flow channel 6, and the fourth flow channel 11 and the fifth flow channel 12 are connected in parallel. A third control valve 111 is provided on the fourth flow channel 11, and the third control valve 111 is connected between the first flow channel 5 and the second flow channel 6 and the rotor of the drive motor 15; a fourth control valve 121 is provided on the fifth flow channel 12, and the fourth control valve 121 is connected between the first flow channel 5 and the second flow channel 6 and the stator of the generator 14.

[0094] like Figure 1 As shown, the fourth flow channel 11 and the fifth flow channel 12 are connected in parallel, and the oil can flow to the rotor of the drive motor 15 through the fourth flow channel 11, and the oil can flow to the stator of the generator 14 through the fifth flow channel 12. The third control valve 111 and the fourth control valve 121 can control the flow of the oil, thereby, the flow to the motor rotor and the stator of the generator 14 can be controlled, so that the oil can meet the cooling of the motor rotor and the stator of the generator 14.

[0095] In some embodiments, the first oil circuit 101 further includes a relief valve 13, the opening of the relief valve 13 is connected to the outlet of the first oil pump 1, and the outlet of the relief valve 13 is connected to the outlet of the suction filter 8. The relief valve 13 is in a normally closed state. When the flow rate of the oil is greater than the set flow rate of the relief valve 13, the relief valve 13 opens under the action of the oil, and the oil flows back to the suction filter 8 through the relief valve 13. Figure 1, after the oil passes through the first oil pump 1 and the first control valve 9, the oil enters the relief valve 13 and the reversing valve 2 respectively. If the relief valve 13 is not opened, the oil will not pass through. When the pressure of the oil is too high, the pressure of the oil will open the switch of the relief valve 13, so that the oil flows back to the outlet end of the suction filter 8 through the relief valve 13. Therefore, the relief valve 13 can control the pressure and flow of the oil, so that the oil flows smoothly in the first oil circuit 101, and adjust the flow of the oil, so that the oil can work normally in the first oil circuit 101.

[0096] For example, in Figure 1 In the example, the electric drive assembly 3 includes a clutch 20, a generator 14, and a drive motor 15. Among them, the generator 14 supplies power to the drive motor 15. The hydraulic system 100 includes a first oil circuit 101 and a second oil circuit 102. The first oil circuit 101 is used to cool and lubricate the generator 14, the drive motor 15 and the clutch 20, and the second oil circuit 102 is used to control the engagement and disconnection of the clutch 20. In this way, the oil flowing in the first oil circuit 101 can reach the clutch 20, the generator 14, and the drive motor 15, and lubricate and cool the clutch 20, the generator 14, and the drive motor 15, so that the clutch 20, the generator 14, and the drive motor 15 can work normally, reduce the heat energy consumption of the clutch 20, the generator 14, and the drive motor 15, and improve work efficiency. The oil in the second oil circuit 102 can control the engagement and disconnection of the clutch 20, so that the vehicle can change the speed during driving, and improve the user experience.

[0097] like Figure 1 and Figure 2 As shown, the second oil circuit 102 also includes a safety valve 90, and the inlet of the safety valve 90 is connected to the outlet of the second oil pump 10. After the oil flows out of the second oil pump 10, it will reach the inlet of the safety valve 90, but when the pressure of the oil is less than the preset opening pressure of the safety valve 90, the safety valve 90 will not open, and the oil cannot pass through the safety valve 90. When the pressure of the oil is greater than the preset pressure of the safety valve 90, the safety valve 90 will open under the pressure of the oil. At this time, it means that the pressure of the oil in the second oil circuit 102 is too high, and the safety valve 90 can reduce the pressure of the oil.

[0098] like Figure 1 and Figure 2 As shown, a third buffer 80 is also included, and the inlet of the third buffer 80 is connected to the inlet of the second pressure regulating valve 50. The oil can reach the third buffer 80 after passing through the second pressure regulating valve 50. The third buffer 80 can alleviate the pressure fluctuation of the oil, so that the oil can flow normally in the second oil circuit 102.

[0099] On the other hand, the utility model provides a vehicle, comprising: the hydraulic system 100 as described above. Such a configuration reduces the power consumption of the vehicle, improves the energy utilization rate of the vehicle, and is beneficial to the user's experience.

[0100] According to the vehicle of the present invention, by adopting the hydraulic system 100, the market competitiveness of the vehicle is improved, which is beneficial to improving the user experience.

[0101] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydraulic system (100), characterized in that: include: A first oil circuit (101), the first oil circuit (101) being used to cool an electric drive assembly (3) of a vehicle; The first oil circuit (101) comprises: a first oil pump (1), a reversing valve (2), an electric drive assembly (3) and a heat exchanger (4); the outlet of the first oil pump (1) is connected to the inlet of the reversing valve (2); the outlet of the reversing valve (2) is respectively connected to a first flow channel (5) and a second flow channel (6); the first flow channel (5) and the second flow channel (6) are connected in parallel and the outlets of the first flow channel (5) and the second flow channel (6) are both connected to the electric drive assembly (3); the heat exchanger (4) is arranged in the first flow channel (5) and is used for exchanging heat with oil passing through the first flow channel (5).

2. The hydraulic system (100) according to claim 1, characterized in that: The hydraulic system (100) further comprises a first working mode. When the hydraulic system (100) is in the first working mode, the reversing valve (2) selectively controls the oil to enter the first flow channel (5) or the second flow channel (6).

3. The hydraulic system (100) according to claim 2, characterized in that: When the hydraulic system (100) is in the first working mode and the temperature of the oil is less than or equal to a first preset temperature, the reversing valve (2) controls the oil to enter the second flow channel (6), and the oil flows toward the electric drive assembly (3) after passing through the second flow channel (6); When the temperature of the oil is greater than the first preset temperature, the reversing valve (2) controls the oil to enter the first flow channel (5), and the oil flows to the electric drive assembly (3) after exchanging heat with the heat exchanger (4) in the first flow channel (5).

4. The hydraulic system (100) according to claim 3, characterized in that: The first preset temperature h satisfies h≤0°C.

5. The hydraulic system (100) according to claim 1, characterized in that: The hydraulic system (100) further comprises a filter press (7) arranged on the first flow channel (5), the inlet of the filter press (7) being connected to the outlet of the heat exchanger (4), the outlet of the filter press (7) being connected to the electric drive assembly (3), and the filter press (7) being used to filter and / or pressurize the oil in the first flow channel (5).

6. The hydraulic system (100) according to claim 1, characterized in that: The first oil circuit (101) further comprises a suction filter (8), the outlet of the suction filter (8) being connected to the first oil pump (1), the suction filter (8) being used to filter the oil, and the oil flows to the first oil pump (1) and the reversing valve (2) after passing through the suction filter (8).

7. The hydraulic system (100) according to claim 1, characterized in that: The first oil circuit (101) further comprises a first control valve (9), wherein an inlet of the first control valve (9) is connected to an outlet of the first oil pump (1), and an outlet of the first control valve (9) is connected to an inlet of the reversing valve (2). The oil passing through the first control valve (9) only flows from the inlet of the first control valve (9) to the outlet of the first control valve (9).

8. The hydraulic system (100) according to claim 6, characterized in that: Also includes: a second oil pump (10), the inlet of the second oil pump (10) being connected to the outlet of the suction filter (8), and the second oil pump (10) being used to increase the pressure of the oil; A clutch (20), wherein the outlet of the second oil pump (10) is connected to the clutch (20), and the second oil pump (10) is used to control the engagement and disengagement of the clutch (20).

9. The hydraulic system (100) according to claim 8, characterized in that: Also includes: A second oil circuit (102), wherein the second oil circuit (102) comprises the second oil pump (10), the clutch (20) and a second control valve (30), wherein the inlet of the second control valve (30) is connected to the outlet of the second oil pump (10), and the outlet of the second control valve (30) is connected to the clutch (20), and the second oil circuit (102) is used to control the engagement and disengagement of the clutch (20).

10. The hydraulic system (100) according to claim 9, characterized in that: The second oil circuit (102) further comprises a first pressure regulating valve (40), the inlet of the first pressure regulating valve (40) being connected to the outlet of the second oil pump (10), the outlet of the first pressure regulating valve (40) being connected to the inlet of the reversing valve (2), the first pressure regulating valve (40) being used to regulate the pressure of the oil, and being used as a passage to allow the oil in the second oil circuit (102) to enter the first oil circuit (101).

11. The hydraulic system (100) according to claim 10, characterized in that The second oil circuit (102) further comprises a second pressure regulating valve (50), the inlet of the second pressure regulating valve (50) being connected to the outlet of the second oil pump (10), and the second pressure regulating valve (50) and the first pressure regulating valve (40) cooperating to control the pressure of the oil in the second oil circuit (102).

12. The hydraulic system (100) according to claim 5, characterized in that: The first flow channel (5) comprises a first sub-flow channel (51) and a second sub-flow channel (52), and the first sub-flow channel (51) and the second sub-flow channel (52) are connected in parallel; The first sub-flow channel (51) is provided with the heat exchanger (4) and the filter press (7), and the second sub-flow channel (52) is provided with a bypass valve (521), the bypass valve (521) being used to adjust the flow rate of oil in the first sub-flow channel (51).

13. The hydraulic system (100) according to claim 12, characterized in that: The inlet of the bypass valve (521) is connected to the outlet of the reversing valve (2), and the outlet of the bypass valve (521) is connected to the electric drive assembly (3); The bypass valve (521) is in a normally closed state. When the oil reaches a set pressure of the bypass valve (521), the bypass valve (521) opens under the action of the pressure of the oil, allowing the oil to pass through the second sub-flow channel (52). After passing through the bypass valve (521), the oil flows into the electric drive assembly (3).

14. The hydraulic system (100) according to claim 9, characterized in that The second oil circuit (102) further comprises a first buffer (60) and a second buffer (70), wherein the inlet of the first buffer (60) is communicated with the outlet of the second oil pump (10), and the inlet of the second buffer (70) is communicated with the outlet of the second control valve (30); The first buffer (60) and the second buffer (70) are used to improve the pressure of the oil when the pressure of the oil is too high.

15. The hydraulic system (100) according to claim 1, characterized in that The first oil circuit (101) further comprises a fourth flow channel (11) and a fifth flow channel (12), wherein the fourth flow channel (11) and the fifth flow channel (12) are both connected to the first flow channel (5) and the second flow channel (6), and the fourth flow channel (11) and the fifth flow channel (12) are connected in parallel; The fourth flow channel (11) is provided with a third control valve (111), and the third control valve (111) is connected between the first flow channel (5), the second flow channel (6) and the rotor of the drive motor (15); The fifth flow channel (12) is provided with a fourth control valve (121), and the fourth control valve (121) is connected between the first flow channel (5), the second flow channel (6) and the stator of the generator (14).

16. The hydraulic system (100) according to claim 6, characterized in that The first oil circuit (101) further comprises a relief valve (13), wherein an opening of the relief valve (13) is connected to an outlet of the first oil pump (1), and an outlet of the relief valve (13) is connected to an outlet of the suction filter (8); The overflow valve (13) is in a normally closed state. When the flow rate of the oil is greater than a set flow rate of the overflow valve (13), the overflow valve (13) opens under the action of the oil, and the oil flows back to the suction filter (8) through the overflow valve (13).

17. The hydraulic system (100) according to claim 9, characterized in that The electric drive assembly (3) comprises: Clutch (20); Generator (14); A drive motor (15), wherein the generator (14) supplies power to the drive motor (15); The hydraulic system (100) comprises a first oil circuit (101) and a second oil circuit (102), wherein the first oil circuit (101) is used to cool and lubricate the generator (14), the drive motor (15) and the clutch (20), and the second oil circuit (102) is used to control the engagement and disengagement of the clutch (20).

18. A vehicle, characterized in that: include: A hydraulic system (100) according to any one of claims 1 to 17.

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