Hybrid transmission, hydraulic control system thereof and vehicle

Abstract

The hydraulic control system comprises a hydraulic oil tank, an oil suction filter, a mechanical oil pump, an electric oil pump, an electromagnetic valve, a damping energy accumulator, a mechanical sliding valve, a first oil port, a second oil port, a first oil way, a second oil way, a third oil way, a fourth oil way, a fifth oil way and a sixth oil way. Wherein the mechanical slide valve is configured to be opened when the oil way pressure of the fifth oil way is larger than the sum of the oil way pressure of the fourth oil way and the spring force, so that oil flows to the sixth oil way along the second oil way to provide lubricating oil for the cooling lubricating oil way, and the electric oil pump is configured to be opened when the oil way pressure of the sixth oil way is too high. And oil in the sixth oil way flows to the first oil way along the third oil way through reverse rotation. Therefore, under the condition that the outlet of the electric oil pump is not provided with a one-way valve and the cooling lubricating oil circuit is not provided with a pressure release valve, pressure release of the lubricating oil circuit is achieved, and therefore the minimum pressure of the main oil circuit is reduced to meet the vehicle control requirement.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and more particularly to a hydraulic control system for a hybrid transmission, a hybrid transmission, and a vehicle. Background Technology

[0002] In the hydraulic control system of a hybrid transmission, a mechanical oil pump and an electric oil pump are typically used as the hydraulic power source, with valves installed at the pump outlets for pressure control and flow distribution. For example, patent CN117739110A includes check valves at the outlets of both the mechanical and electric oil pumps. The oil output from the electric pump can flow to the lubrication circuit via a control solenoid valve, reducing the minimum pressure in the control circuit. Simultaneously, a pressure relief valve is designed at the mechanical pump outlet to allow oil to flow back to the pump inlet when the lubrication circuit pressure is high. However, the problem with this technology is that adding a pressure relief valve and other control valves at the pump outlet to reduce the minimum pressure in the control circuit increases the complexity of the entire system and leads to higher costs. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in the related art. Therefore, the first objective of this invention is to provide a hydraulic control system for a hybrid transmission that can depressurize the lubrication circuit without designing a one-way valve at the electric oil pump outlet or a pressure relief valve in the cooling lubrication circuit, thereby reducing the minimum pressure in the main oil circuit to meet vehicle control requirements.

[0004] The second objective of this invention is to provide a hybrid transmission. The third objective of this invention is to provide a vehicle.

[0005] To achieve the above objectives, the hydraulic control system for a hybrid transmission according to the first aspect of the present invention includes: a hydraulic oil tank, an oil suction filter, a mechanical oil pump, an electric oil pump, a solenoid valve, a shock-absorbing accumulator, a mechanical spool valve, a first oil port, a second oil port, a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, and a sixth oil circuit; wherein, the mechanical spool valve is configured to open when the oil circuit pressure of the fifth oil circuit is greater than the sum of the oil circuit pressure of the fourth oil circuit and the spring force, so that oil flows along the second oil circuit to the sixth oil circuit to provide lubricating oil for the cooling lubrication circuit; the electric oil pump is configured to reverse the flow when the oil circuit pressure of the sixth oil circuit is too high, so that the oil in the sixth oil circuit flows along the third oil circuit to the first oil circuit.

[0006] According to an embodiment of the hydraulic control system of a hybrid transmission of the present invention, a mechanical spool valve is configured to open when the oil pressure in the fifth oil circuit is greater than the sum of the oil pressure in the fourth oil circuit and the spring force, allowing oil to flow along the second oil circuit to the sixth oil circuit to provide lubricating oil for the cooling lubrication circuit. Furthermore, an electric oil pump is configured to reverse its direction when the oil pressure in the sixth oil circuit is too high, causing the oil in the sixth oil circuit to flow along the third oil circuit to the first oil circuit. Thus, without a check valve at the outlet of the electric oil pump or a pressure relief valve in the cooling lubrication circuit, pressure relief is achieved in the lubrication circuit, thereby reducing the minimum pressure in the main oil circuit to meet vehicle control requirements.

[0007] In addition, the hydraulic control system of the hybrid transmission according to the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the electric oil pump is specifically configured to reverse when the oil pressure in the sixth oil circuit is greater than a preset pressure threshold.

[0008] According to one embodiment of the present invention, the electric oil pump is specifically configured to reverse when the ambient temperature is below a preset temperature threshold and the oil output of the mechanical oil pump remains unchanged.

[0009] According to one embodiment of the present invention, the electric oil pump is specifically configured to reverse when the mechanical oil pump is operating at high speed.

[0010] According to one embodiment of the present invention, the mechanical slide valve is a two-position two-way valve.

[0011] According to one embodiment of the present invention, a spring is provided on one side of the mechanical slide valve, and a fourth oil passage is connected to the side of the mechanical slide valve where the spring is provided, and a fifth oil passage is connected to the other side of the mechanical slide valve through a second oil port.

[0012] According to one embodiment of the present invention, the mechanical slide valve is a three-position four-way valve.

[0013] According to one embodiment of the present invention, the mechanical slide valve is connected to the first oil circuit through the outlet oil circuit.

[0014] To achieve the above objectives, a hybrid transmission according to a second aspect of the present invention includes the hydraulic control system of the hybrid transmission described in the above-described embodiments of the present invention.

[0015] According to the hybrid transmission of the present invention, the aforementioned hydraulic control system of the hybrid transmission can achieve pressure relief of the lubrication circuit without designing a one-way valve at the outlet of the electric oil pump and without designing a pressure relief valve in the cooling lubrication circuit, thereby reducing the minimum pressure of the main oil circuit to meet the vehicle control requirements.

[0016] To achieve the above objectives, the vehicle proposed in the third aspect of the present invention includes the hybrid transmission described in the embodiments of the present invention.

[0017] According to the vehicle of the present invention, the aforementioned hybrid transmission enables depressurization of the lubrication circuit without the need for a one-way valve at the outlet of the electric oil pump and a pressure relief valve in the cooling lubrication circuit, thereby reducing the minimum pressure of the main oil circuit to meet vehicle control requirements.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the hydraulic control system of a hybrid transmission according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the hydraulic control system of a hybrid transmission according to another embodiment of the present invention; Figure 3 This is a block diagram of a hybrid transmission according to an embodiment of the present invention; Figure 4 This is a block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The hydraulic control system of the hybrid transmission, the hybrid transmission, and the vehicle according to embodiments of the present invention are described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the hydraulic control system of a hybrid transmission according to an embodiment of the present invention.

[0023] Specifically, in some embodiments of the present invention, such as Figure 1 As shown, the hydraulic control system 1000 of the hybrid transmission includes: a hydraulic oil tank 1, an oil suction filter 2, a mechanical oil pump 3, an electric oil pump 4, a solenoid valve 5, a shock absorber accumulator 6, a mechanical spool valve 7, a first oil port 8, a second oil port 9, a first oil circuit 101, a second oil circuit 201, a third oil circuit 301, a fourth oil circuit 401, a fifth oil circuit 501, and a sixth oil circuit 601.

[0024] The mechanical slide valve 7 is configured to open when the pressure of the fifth oil passage 501 is greater than the sum of the pressure of the fourth oil passage 401 and the spring force, so that the oil flows along the second oil passage 201 to the sixth oil passage 601 to provide lubricating oil for the cooling lubrication oil passage. The electric oil pump 4 is configured to reverse the flow of the oil in the sixth oil passage 601 along the third oil passage 301 to the first oil passage 101 when the oil passage pressure of the sixth oil passage 601 is too high.

[0025] It is understood that, in this embodiment of the present invention, as Figure 1 As shown, when the mechanical oil pump 3 rotates, the oil flows from the hydraulic oil tank 1 through the suction filter 2 and then through the second oil circuit 201 (i.e., the main oil circuit of the system). At this time, for the mechanical slide valve 7, when the pressure on the left side of the mechanical slide valve 7 (i.e., the pressure of the fifth oil circuit 501) is greater than the pressure on the right side of the mechanical slide valve 7 (i.e., the sum of the pressure of the fourth oil circuit 401 and the spring force), the mechanical slide valve 7 opens, and the oil flows along the second oil circuit 201 through the mechanical slide valve 7 to the sixth oil circuit 601 to provide lubricating oil for the cooling and lubrication circuit.

[0026] Meanwhile, in this embodiment of the present invention, as Figure 1 As shown, for the electric oil pump 4, when the oil pressure in the sixth oil circuit 601 (i.e., the cooling and lubrication oil circuit) is found to be too high, the electric oil pump 4 is controlled to reverse, so that the oil in the sixth oil circuit 601 flows along the third oil circuit 301 to the first oil circuit 101 (i.e., the inlet of the mechanical oil pump 1, achieving the same function as adding an oil return port on the main oil circuit pressure valve or adding a pressure relief valve in the cooling and lubrication oil circuit), thereby achieving pressure relief in the sixth oil circuit 601, and thus reducing the minimum pressure of the second oil circuit 201.

[0027] Furthermore, in some embodiments of the present invention, the electric oil pump 4 is specifically configured to reverse when the oil pressure in the sixth oil passage 601 is greater than a preset pressure threshold.

[0028] It is understood that in this embodiment of the present invention, when the oil pressure of the sixth oil circuit 601 is greater than the preset pressure threshold, it is determined that the oil pressure of the sixth oil circuit 601 is too high, and the oil pressure of the second oil circuit 201 is also too high, which is not conducive to vehicle control. At this time, the electric oil pump 4 is controlled to reverse, so that the oil in the sixth oil circuit 601 flows along the third oil circuit 301 to the first oil circuit 101, thereby realizing the pressure relief of the sixth oil circuit 601, and thus reducing the minimum pressure of the second oil circuit 201.

[0029] Furthermore, in some embodiments of the present invention, the electric oil pump is specifically configured to reverse when the ambient temperature is below a preset temperature threshold and the oil output of the mechanical oil pump remains unchanged.

[0030] It is understood that in this embodiment of the present invention, when the ambient temperature is lower than the preset temperature threshold and the oil output of the mechanical pump remains unchanged, the viscosity of the oil will increase under low temperature conditions. Consequently, the oil pressure of the sixth oil circuit 601 will increase, and the oil pressure of the second oil circuit 201 will also increase, which is not conducive to vehicle control. At this time, the electric oil pump 4 is controlled to reverse, so that the oil in the sixth oil circuit 601 flows along the third oil circuit 301 to the first oil circuit 101, thereby realizing the depressurization of the sixth oil circuit 601 and reducing the minimum pressure of the second oil circuit 201.

[0031] Furthermore, in some embodiments of the present invention, the electric oil pump is specifically configured to reverse when the mechanical oil pump is operating at high speed.

[0032] It is understood that in this embodiment of the present invention, when the mechanical oil pump 1 is in high-speed operation, the output flow of the mechanical oil pump 1 increases, the amount of oil flowing through the sixth oil circuit 601 increases, which causes the oil circuit pressure of the sixth oil circuit 601 to rise, and the oil circuit pressure of the second oil circuit 201 also rises accordingly, which is not conducive to vehicle control. At this time, the electric oil pump 4 is controlled to reverse, so that the oil in the sixth oil circuit 601 flows along the third oil circuit 301 to the first oil circuit 101, thereby realizing the depressurization of the sixth oil circuit 601, and thus reducing the minimum pressure of the second oil circuit 201.

[0033] Specifically, in the above embodiments of the present invention, when the pressure of the sixth oil circuit 601 is too high, or under low temperature conditions, or when the speed of the mechanical oil pump 1 is too high, a reverse control strategy of the electric oil pump 4 is added to achieve pressure relief of the lubricating oil circuit and reduce the minimum pressure of the main oil circuit to meet the control requirements.

[0034] The hydraulic control system 1000 of the hybrid transmission of the present invention will be further described below with reference to specific embodiments of the present invention: Specifically, in some embodiments of the present invention, such as Figure 1 As shown, mechanical slide valve 7 is a two-position two-way valve.

[0035] It is understood that in this embodiment of the present invention, a two-position two-way valve is used as the mechanical slide valve 7.

[0036] More specifically, in some embodiments of the invention, such as Figure 1 As shown, a spring is provided on one side of the mechanical slide valve 7, and the fourth oil passage 401 is connected to the side of the mechanical slide valve 7 with the spring. The fifth oil passage 501 is connected to the other side of the mechanical slide valve 7 through the second oil port 9.

[0037] It is understood that in this embodiment of the present invention, when the pressure on one side of the mechanical slide valve 7 (the oil pressure in the fifth oil circuit 501) is greater than the pressure on the other side (the sum of the oil pressure in the fourth oil circuit 401 and the spring force), the mechanical slide valve 7 opens; conversely, when the pressure on one side of the mechanical slide valve 7 (the oil pressure in the fifth oil circuit 501) is less than or equal to the pressure on the other side (the sum of the oil pressure in the fourth oil circuit 401 and the spring force), the mechanical slide valve 7 closes.

[0038] It should be noted that, in the above embodiments of the present invention, as Figure 1 As shown, the fourth oil circuit 401 is connected to the solenoid valve 5 through the first oil port 8. The oil pressure of the fourth oil circuit 401 is controlled by the solenoid valve 5. The oil pressure of the fifth oil circuit 501 is the same as that of the second oil circuit 201.

[0039] Specifically, in some embodiments of the present invention, such as Figure 2 As shown, mechanical slide valve 7 is a three-position four-way valve.

[0040] It is understood that, in this embodiment of the present invention, a three-position four-way valve is used as the mechanical slide valve 7.

[0041] More specifically, in some embodiments of the invention, such as Figure 2 As shown, the mechanical slide valve 7 is connected to the first oil passage 101 through the outlet oil passage 701.

[0042] It is understandable that by adding the mechanical slide valve 7, the outlet oil circuit 701 is directly connected to the first oil circuit 101. Thus, when the pressure in the sixth oil circuit 601 is too high, or under low temperature conditions, or when the speed of the mechanical oil pump 1 is too high, a portion of the oil can flow back to the first oil circuit 101 through the outlet oil circuit 701, thereby reducing the minimum pressure of the main oil circuit. At the same time, the electric oil pump 4 can also be controlled to reverse at this time, thereby achieving the function of depressurizing the lubricating oil circuit and reducing the minimum pressure of the main oil circuit.

[0043] In summary, according to the hydraulic control system of the hybrid transmission of the present invention, the mechanical spool valve is configured to open when the oil pressure in the fifth oil circuit is greater than the oil pressure in the fourth oil circuit and the spring force, allowing oil to flow along the second oil circuit to the sixth oil circuit to provide lubricating oil for the cooling lubrication circuit. Furthermore, the electric oil pump is configured to reverse, causing the oil in the sixth oil circuit to flow along the third oil circuit to the first oil circuit. Thus, without a check valve at the outlet of the electric oil pump and without a pressure relief valve in the cooling lubrication circuit, pressure relief in the lubrication circuit is achieved, thereby reducing the minimum pressure in the main oil circuit to meet vehicle control requirements.

[0044] Figure 3 This is a block diagram of a hybrid transmission according to an embodiment of the present invention.

[0045] Specifically, in some embodiments of the present invention, such as Figure 3 As shown, the hybrid transmission 2000 includes the hydraulic control system 1000 of the hybrid transmission in the above embodiment of the present invention.

[0046] It should be understood that the specific implementation of the hybrid transmission 2000 in the embodiments of the present invention can refer to the specific implementation of the hydraulic control system 1000 of the hybrid transmission in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0047] In summary, the hybrid transmission according to the embodiments of the present invention, using the aforementioned hydraulic control system of the hybrid transmission, can achieve pressure relief of the lubrication circuit without designing a one-way valve at the outlet of the electric oil pump and without designing a pressure relief valve in the cooling lubrication circuit, thereby reducing the minimum pressure of the main oil circuit to meet the vehicle control requirements.

[0048] Figure 4 A block diagram of a vehicle according to an embodiment of the present invention.

[0049] Specifically, in some embodiments of the present invention, such as Figure 4 As shown, vehicle 3000 includes the hybrid transmission 2000 described in the above embodiment of the present invention.

[0050] It should be understood that the specific implementation of the vehicle 3000 in the embodiments of the present invention can refer to the specific implementation of the hydraulic control system 1000 of the hybrid transmission in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0051] In summary, the hybrid transmission according to the embodiments of the present invention, using the aforementioned hydraulic control system of the hybrid transmission, can achieve pressure relief of the lubrication circuit without designing a one-way valve at the outlet of the electric oil pump and without designing a pressure relief valve in the cooling lubrication circuit, thereby reducing the minimum pressure of the main oil circuit to meet the vehicle control requirements.

[0052] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0053] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0054] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic control system for a hybrid transmission, characterized in that, The system includes: a hydraulic oil tank, an oil suction filter, a mechanical oil pump, an electric oil pump, a solenoid valve, a shock-absorbing accumulator, a mechanical slide valve, a first oil port, a second oil port, a first oil passage, a second oil passage, a third oil passage, a fourth oil passage, a fifth oil passage, and a sixth oil passage; The mechanical slide valve is configured to open when the oil pressure in the fifth oil circuit is greater than the sum of the oil pressure in the fourth oil circuit and the spring force, so that the oil flows along the second oil circuit to the sixth oil circuit to provide lubricating oil for the cooling lubrication circuit. The electric oil pump is configured to reverse the flow of the oil in the sixth oil circuit to the first oil circuit by reversing the flow when the oil pressure in the sixth oil circuit is too high.

2. The hydraulic control system for the hybrid transmission according to claim 1, characterized in that, The electric oil pump is specifically configured to reverse when the oil pressure in the sixth oil circuit is greater than a preset pressure threshold.

3. The hydraulic control system for the hybrid transmission according to claim 1, characterized in that, The electric oil pump is specifically configured to reverse when the ambient temperature is below a preset temperature threshold and the oil output of the mechanical oil pump remains unchanged.

4. The hydraulic control system for the hybrid transmission according to claim 1, characterized in that, The electric oil pump is specifically configured to reverse when the mechanical oil pump is operating at high speed.

5. The hydraulic control system for the hybrid transmission according to any one of claims 2-4, characterized in that, The mechanical slide valve is a two-position two-way valve.

6. The hydraulic control system for the hybrid transmission according to any one of claims 2-4, characterized in that, The mechanical slide valve is provided with a spring on one side, and the fourth oil passage is connected to the side of the mechanical slide valve provided with the spring. The fifth oil passage is connected to the other side of the mechanical slide valve through the second oil port.

7. The hydraulic control system for the hybrid transmission according to any one of claims 2-4, characterized in that, The mechanical slide valve is a three-position four-way valve.

8. The hydraulic control system for the hybrid transmission according to claim 7, characterized in that, The mechanical slide valve is connected to the first oil circuit via the outlet oil circuit.

9. A hybrid transmission, characterized in that, The hybrid transmission includes a hydraulic control system for a hybrid transmission as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the hybrid transmission as described in claim 9.

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