Lubricating system and control method thereof

Abstract

The invention provides a lubricating system and a control method thereof, and the system comprises an oil pan filled with lubricating oil; the engine oil filter is arranged in the oil pan, and an inlet of the engine oil filter is communicated with the interior of the oil pan; an outlet of the engine oil filter is communicated with an inlet of the electronic pump module; an outlet of the electronic pump module is communicated with the lubricating pipeline and the lubricating point, and lubricating oil after lubrication can flow back to the interior of the oil pan again; the structure is extremely simple, bidirectional adaptation is achieved, the cost is optimized, reliability is high, compatibility is high, the system can be independently used as a small gearbox lubricating scheme, and the system and a double-electronic-pump scheme can also form a product matrix to meet the requirements of commercial vehicles of different tonnages.

Description

Technical Field

[0001] This invention relates to the technical field of active lubrication systems for electronic pumps in the transmissions of new energy commercial vehicles, specifically to a lubrication system and its control method. Background Technology

[0002] The input speed of transmissions in new energy commercial vehicles is generally higher than that of traditional transmissions. When the motor speed exceeds 5000 rpm, an active lubrication system is required to ensure the reliable operation of components such as gears and bearings. Currently, commercial vehicle transmissions often use high-viscosity lubricating oil due to the large torque and power they transmit, and active lubrication systems typically employ mechanical pumps to achieve the active lubrication function.

[0003] Existing active lubrication methods still have the following drawbacks: 1) Low efficiency: The flow rate and speed of mechanical pumps are related to the viscosity of lubricating oil. Under normal operating conditions, the flow rate is too high, resulting in additional power loss and a decrease in system efficiency. 2) Insufficient reliability: The mechanical pump needs to have a bidirectional oil supply function to take into account both normal driving and reversing conditions, which leads to a decrease in system reliability. 3) Poor flexibility: Although it can provide reliable lubrication in low-temperature environments, it cannot adapt to the flow and pressure requirements of different working conditions, and it is difficult to take into account both low-temperature cold start and high-efficiency lubrication conditions at room temperature. 4) Pain points of electronic pumps: Although using electronic pumps can avoid the problem of bidirectional oil supply and improve system efficiency, it is difficult to start cold at low temperatures. At low temperatures, the viscosity of lubricating oil is high, and a single electronic pump cannot provide enough oil pressure to achieve pre-lubrication, which restricts its application in commercial vehicle transmissions. 5) The space of the transmission in small new energy commercial vehicles is limited and the cost is sensitive. The multi-electronic pump design cannot simultaneously meet its lubrication, space and cost requirements.

[0004] Therefore, there is an urgent need to provide a new solution to address the defects and shortcomings of the existing technologies. Summary of the Invention

[0005] In order to overcome the defects and shortcomings of the existing technology, the present invention provides a lubrication system and its control method.

[0006] To address the shortcomings and deficiencies in existing technologies, the present invention provides the following specific solution: A lubrication system, the system comprising: An oil pan, the interior of which is filled with lubricating oil; An oil filter, wherein the oil filter is disposed inside the oil pan and its inlet is connected to the inside of the oil pan; An electronic pump module, wherein the outlet of the oil filter is connected to the inlet of the electronic pump module; The lubrication pipeline and lubrication point are connected to the outlet of the electronic pump module, and the lubricating oil after lubrication can flow back into the oil pan. Its features are: The electronic pump module includes: An electronic pump is provided, wherein the outlet of the oil filter is optionally connected to the electronic pump via a second or fourth check valve; and the outlet of the electronic pump is optionally connected to the lubrication pipeline and lubrication point via a first or third check valve. The electronic pump can operate in both clockwise and counterclockwise rotation modes; The first check valve, the second check valve, the third check valve, and the fourth check valve can control the opening and closing of the corresponding oil circuit by their own on / off states. The system can switch between different operating modes of the lubrication system according to the current driving conditions of the vehicle by switching the rotation mode of the electronic pump and controlling the on / off state of the first, second, third, and fourth one-way valves.

[0007] As a further preferred embodiment of the present invention, when the vehicle is in forward operation, the electronic pump is controlled to rotate clockwise, and the first and fourth check valves are controlled to be disconnected, while the second and third check valves are connected. At this time, the oil circuit is: oil pan → oil filter → second check valve → electronic pump → third check valve → lubrication pipeline and lubrication point.

[0008] As a further preferred embodiment of the present invention, when the vehicle is in reverse, the electronic pump is controlled to rotate counterclockwise, and the first one-way valve and the fourth one-way valve are controlled to be connected, while the second one-way valve and the third one-way valve are controlled to be disconnected; at this time, the oil circuit is: oil pan → oil filter → fourth one-way valve → electronic pump → first one-way valve → lubrication pipeline and lubrication point.

[0009] Furthermore, the present invention also provides a lubrication system, the system comprising: An oil pan, the interior of which is filled with lubricating oil; An oil filter, wherein the oil filter is disposed inside the oil pan and its inlet is connected to the inside of the oil pan; A dual electronic pump module, wherein the outlet of the oil filter is connected to the inlet of the dual electronic pump module; The lubrication pipeline and lubrication point are connected to the outlet of the dual electronic pump module, and the lubricating oil after lubrication can flow back into the oil pan. Its features are: The dual electronic pump module includes: The first electronic pump, wherein the outlet of the oil filter is optionally connected to the first electronic pump via a second check valve or a fourth check valve; The outlet of the first electronic pump is optionally connected to the second electronic pump via a first check valve or a third check valve. Both the first and second electronic pumps are capable of operating in clockwise and counterclockwise rotation modes. The first check valve, the second check valve, the third check valve, and the fourth check valve can control the opening and closing of the corresponding oil circuit by their own on / off states. The system also includes an oil temperature sensor connected to the oil circuit, and a pressure sensor and a speed sensor connected to each electronic pump. The fault detection module is connected to the pressure sensor and the speed sensor respectively. By comparing the real-time oil temperature detected by the oil temperature sensor with a preset threshold and the detection results of the fault detection module, the system can switch between different working modes of the lubrication system through the rotation mode switching of the first electronic pump and the second electronic pump, and the on / off control of the first check valve, the second check valve, the third check valve and the fourth check valve.

[0010] As a further preferred embodiment of the present invention, the system is capable of operating in at least the following modes: normal temperature parallel mode, low temperature series mode, and fault limp mode.

[0011] As a further preferred embodiment of the present invention, when the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold satisfies: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode.

[0012] As a further preferred embodiment of the present invention, when the system operates in parallel mode at room temperature, the first and second electronic pumps are controlled to operate in clockwise rotation mode, and the first, second, and third check valves are controlled to be in a connected state, while the fourth check valve is in a disconnected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → second electronic pump → third check valve → lubrication pipeline and lubrication point; and oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication pipeline and lubrication point.

[0013] As a further preferred embodiment of the present invention, when the system operates in low-temperature series mode, the first electronic pump is controlled to operate in clockwise rotation mode, the second electronic pump is controlled to operate in counterclockwise rotation mode, and the first one-way valve and the fourth one-way valve are controlled to be in a connected state, while the second one-way valve and the third one-way valve are in a disconnected state; at this time, the oil circuit is: oil pan → oil filter → fourth one-way valve → second electronic pump → first one-way valve → first electronic pump → lubrication pipeline and lubrication point.

[0014] As a further preferred embodiment of the present invention, when the system operates in fault limp mode... When the first electronic pump fails: the first electronic pump is stopped, the second electronic pump operates in clockwise rotation mode, and the first and fourth check valves are kept in the open state, while the second and third check valves are kept in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first electronic pump → third check valve → lubrication line and lubrication point; When the second electronic pump fails: the second electronic pump is stopped, the first electronic pump operates in clockwise rotation mode, and the third and fourth check valves are kept in the open state, while the first and second check valves are in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point.

[0015] Furthermore, the present invention also provides a control method for a lubrication system, characterized by comprising the following steps: S100: Confirm the system operating mode based on the test results: When the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold is satisfied: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode. S200: Controls the electronic pump and check valve accordingly in the corresponding operating mode: When the system operates in parallel mode at normal temperature, both the first and second electronic pumps are controlled to rotate clockwise, and the first, second, and third check valves are controlled to be in the connected state, while the fourth check valve is in the disconnected state. At this time, the oil circuit is: oil pan → oil filter → second check valve → second electronic pump → third check valve → lubrication line and lubrication point; and oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point. When the system operates in low-temperature series mode, the first electronic pump is controlled to operate in clockwise rotation mode, the second electronic pump is controlled to operate in counterclockwise rotation mode, and the first and fourth check valves are controlled to be in the connected state, while the second and third check valves are in the disconnected state; at this time, the oil circuit is: oil pan → oil filter → fourth check valve → second electronic pump → first check valve → first electronic pump → lubrication line and lubrication point; When the system is operating in fault limp mode When the first electronic pump fails: the first electronic pump is stopped, the second electronic pump operates in clockwise rotation mode, and the first and fourth check valves are kept in the open state, while the second and third check valves are kept in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first electronic pump → third check valve → lubrication line and lubrication point; When the second electronic pump fails: the second electronic pump is stopped, the first electronic pump operates in clockwise rotation mode, and the third and fourth check valves are kept in the open state, while the first and second check valves are in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point.

[0016] Compared with existing technologies, the technical effects that this invention can achieve include: 1) This invention provides a lubrication system and its control method, which has strong adaptability to working conditions: it can switch between parallel mode at normal temperature and series mode at low temperature, taking into account both the needs of low temperature high oil pressure pre-lubrication and high flow rate lubrication at normal temperature, and solving the problem of low temperature cold start of a single electronic pump. 2) This invention provides a lubrication system and its control method, which improves system efficiency: by replacing the mechanical pump with an electronic pump, the problem of excessive flow rate under normal operating conditions of the mechanical pump is avoided, and the flow rate and pressure are matched as needed, reducing power loss and improving system efficiency; 3) This invention provides a lubrication system and its control method, which enhances reliability: it eliminates the need for a mechanical pump bidirectional oil supply structure, simplifying oil circuit design; it can achieve redundant oil supply in case of single pump failure, enabling low-speed limp-out and improving system reliability; 4) This invention provides a lubrication system and its control method, which is compact and lightweight: it adopts a small-flow electronic pump, which is small in size and light in weight, making it easy to arrange inside the gearbox and adapting to the space constraints of new energy commercial vehicles; 5) This invention provides a lubrication system and its control method, with an extremely simple structure: a single electronic pump replaces the dual electronic pump, reducing volume by 30% and weight by 25%, adapting to the space constraints of small gearboxes; bidirectional compatibility: no additional reversing mechanism is required, and the single pump rotates bidirectionally to provide unidirectional oil supply through the on / off control of a one-way valve, completely solving the lubrication problem in reversing conditions; cost optimization: reducing one electronic pump and its supporting control module reduces material costs by 40%, and the control logic is simpler; high reliability: the one-way valve group has a simple structure with no complex moving parts, and the failure rate is ≤0.2% / year, which is better than traditional bidirectional mechanical pumps; strong compatibility: it can be used independently as a lubrication solution for small gearboxes, or it can form a product matrix with the dual electronic pump solution to cover the needs of commercial vehicles of different tonnages. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic diagram of the lubrication system provided in the first embodiment of the present invention.

[0018] Figure 2 The diagram shown is a schematic diagram of the lubrication oil circuit of the lubrication system provided in the first embodiment of the present invention when the vehicle is moving forward.

[0019] Figure 3 The diagram shows the lubrication oil circuit of the lubrication system provided in the first embodiment of the present invention when the vehicle is reversing.

[0020] Figure 4 The diagram shown is a schematic diagram of the lubrication system provided in the second embodiment of the present invention.

[0021] Figure 5 The diagram shown is a schematic diagram of the lubrication oil circuit of the lubrication system provided in the second embodiment of the present invention in the parallel mode at room temperature.

[0022] Figure 6 The diagram shown is a schematic diagram of the lubrication oil circuit of the lubrication system provided in the second embodiment of the present invention in the low-temperature series mode.

[0023] Figure 7 The diagram shown is a schematic diagram of the lubrication oil circuit when the first electronic pump fails in the fault limp mode of the lubrication system provided in the second embodiment of the present invention.

[0024] Figure 8 The diagram shown is a schematic diagram of the lubrication oil circuit when the second electronic pump fails in the fault limp mode of the lubrication system provided in the second embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., 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 for simplifying the description, and do not 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] [First Embodiment] like Figure 1-3 The image shows a lubrication system provided in the first embodiment of the present invention, such as... Figure 1 As shown, the system includes: Oil pan O, the inside of the oil pan is filled with lubricating oil; Oil filter L is located inside the oil pan O and its inlet is connected to the inside of the oil pan O. The oil filter L filters impurities in the lubricating oil to ensure the life of the pump unit and lubrication components. The outlet of the oil filter L is connected to the inlet of the electronic pump module; The lubrication pipeline and lubrication point R are connected to the outlet of the electronic pump module, and the lubricating oil after lubrication can flow back to the oil pan. The lubrication pipeline and lubrication point R can deliver lubricating oil to the gears, bearings and other lubrication parts of the gearbox. The electronic pump module includes: The outlet of the electronic pump P and the oil filter L are optionally connected to the electronic pump P via the second check valve V2 or the fourth check valve V4; the outlet of the electronic pump P is optionally connected to the lubrication line and lubrication point R via the first check valve V1 or the third check valve V3. The electronic pump P can operate in both clockwise and counterclockwise rotation modes; The first check valve V1, the second check valve V2, the third check valve V3, and the fourth check valve V4 can control the opening and closing of the corresponding oil circuit by means of pressure difference. The system can switch between different working modes of the lubrication system according to the current driving conditions of the vehicle by switching the rotation mode of the electronic pump P and controlling the on / off state of the first one-way valve V1, the second one-way valve V2, the third one-way valve V3 and the fourth one-way valve V4.

[0029] like Figure 2 As shown, when the vehicle is in forward motion, the electronic pump P is controlled to rotate clockwise, and the first check valve V1 and the fourth check valve V4 are controlled to be disconnected, while the second check valve V2 and the third check valve V3 are connected. At this time, the oil circuit is: oil pan O → oil filter L → second check valve V2 → electronic pump P → third check valve V3 → lubrication line and lubrication point R; so as to achieve a stable forward oil supply when the vehicle is in forward motion.

[0030] like Figure 3 As shown, when the vehicle is in reverse, the electronic pump P is controlled to rotate counterclockwise, and the first check valve V1 and the fourth check valve V4 are connected, while the second check valve V2 and the third check valve V3 are disconnected. At this time, the oil circuit is: oil pan O → oil filter L → fourth check valve V4 → electronic pump P → first check valve V1 → lubrication line and lubrication point R; so as to achieve stable reverse oil supply when the vehicle is in reverse.

[0031] The technical solution provided in this embodiment can be applied to the lubrication process of small new energy commercial vehicle transmissions with limited space and sensitive costs. By controlling the on / off state of four one-way valves, combined with the steering control of a single electronic pump that can rotate clockwise or counterclockwise in both directions, it can achieve stable one-way oil supply, effectively adapting to the vehicle's forward and reverse driving conditions, while retaining the core advantages of efficient lubrication and reliable oil supply.

[0032] The technical solution provided in this embodiment has the following advantages: Extremely simple structure: Replacing the dual electronic pump with a single electronic pump reduces volume by 30% and weight by 25%, adapting to the space constraints of small transmissions; Bidirectional compatibility: No additional reversing mechanism is needed; the single pump rotates bidirectionally to provide unidirectional oil supply through one-way valve on / off control, completely solving the lubrication problem in reversing conditions; Cost optimization: Reducing one electronic pump and its associated control module lowers material costs by 40%, and simplifies control logic; High reliability: The one-way valve assembly has a simple structure with no complex moving parts, and a failure rate of ≤0.2% / year, superior to traditional bidirectional mechanical pumps; Strong compatibility: It can be used independently as a lubrication solution for small transmissions, or it can form a product matrix with the dual electronic pump solution, covering the needs of commercial vehicles of different tonnages.

[0033] [Second Embodiment] like Figure 4-8 The image shows a lubrication system provided in a second embodiment of the present invention, such as... Figure 4 As shown, the system includes: Oil pan O, the inside of the oil pan is filled with lubricating oil; Oil filter L is located inside the oil pan O and its inlet is connected to the inside of the oil pan. Oil filter L filters impurities in the lubricating oil to ensure the life of the pump unit and lubrication components. The oil filter outlet is connected to the inlet of the dual electronic pump module; The lubrication pipeline and lubrication point are connected to the outlet of the dual electronic pump module, and the lubricating oil after lubrication can flow back to the oil pan. The lubrication pipeline and lubrication point R can deliver lubricating oil to the gears, bearings and other lubrication parts of the gearbox. The dual electronic pump module includes: The outlet of the first electronic pump P1 and the oil filter L can be connected to the first electronic pump P1 in an optional manner via the second check valve V2 or the fourth check valve V4. The outlet of the first electronic pump P1 is connected to the second electronic pump P2 via either the first check valve V1 or the third check valve V3 in an optional manner. Both the first electronic pump P1 and the second electronic pump P2 can operate in clockwise rotation mode and counterclockwise rotation mode. The first check valve V1, the second check valve V2, the third check valve V3, and the fourth check valve V4 can control the opening and closing of the corresponding oil circuit by means of pressure difference. The system also includes an oil temperature sensor connected to the oil circuit, and a pressure sensor and a speed sensor connected to each electronic pump. The fault detection module is connected to the pressure sensor and the speed sensor respectively. By comparing the real-time oil temperature detected by the oil temperature sensor with the preset threshold and the detection results of the fault detection module, the system can switch between different working modes of the lubrication system through the rotation mode switching of the first electronic pump and the second electronic pump, and the on / off control of the first check valve, the second check valve, the third check valve and the fourth check valve.

[0034] In this embodiment, the system is capable of operating in at least three modes: normal temperature parallel mode, low temperature series mode, and fault limp mode. The low-temperature series mode is suitable for low-temperature cold start conditions. It solves the problem of low-temperature oil supply for high-viscosity lubricating oil by pre-lubricating with high oil pressure and low flow rate. The parallel mode at room temperature is suitable for normal operating conditions and meets daily high-efficiency lubrication needs through low oil pressure and high flow rate lubrication. The fault limp mode is suitable for fault redundancy conditions. When one pump fails, the other pump works independently to achieve low-speed limp function. It simultaneously addresses the core issues of low efficiency and poor reliability of mechanical pumps, as well as the difficulty of cold starting electronic pumps at low temperatures.

[0035] In this embodiment, the switching criteria for each working mode are: When the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold is satisfied: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode.

[0036] like Figure 5 As shown, when the system operates in parallel mode at normal temperature, both the first electronic pump P1 and the second electronic pump P2 are controlled to operate in clockwise rotation mode, and the first one-way valve V1, the second one-way valve V2, and the third one-way valve V3 are controlled to be in the connected state, while the fourth one-way valve V4 is in the disconnected state. At this time, the oil circuit is: oil pan O → oil filter L → second one-way valve V2 → second electronic pump P2 → third one-way valve V3 → lubrication pipeline and lubrication point R; and oil pan O → oil filter L → second one-way valve V2 → first one-way valve V1 → first electronic pump P1 → lubrication pipeline and lubrication point R. At this time, the system oil pressure is the single pump oil pressure, and the system flow rate is the sum of the flow rates of the two pumps, which can meet the daily high-flow lubrication needs of the transmission.

[0037] like Figure 6 As shown, when the system operates in low-temperature series mode, the first electronic pump P1 is controlled to operate in clockwise rotation mode, the second electronic pump P2 is controlled to operate in counterclockwise rotation mode, and the first one-way valve V1 and the fourth one-way valve V4 are controlled to be in the connected state, while the second one-way valve V2 and the third one-way valve V3 are in the disconnected state. At this time, the oil circuit is: oil pan O → oil filter L → fourth one-way valve V4 → second electronic pump P2 → first one-way valve V1 → first electronic pump P1 → lubrication pipeline and lubrication point R. At this time, the system oil pressure is the sum of the oil pressures of the two pumps, and the system flow rate is the flow rate of a single pump. This can achieve high oil pressure pre-lubrication of low-temperature high-viscosity lubricating oil. After the oil temperature rises, the system switches to parallel mode.

[0038] like Figure 7-8 As shown, when the system operates in fault limp mode, like Figure 7 As shown, when the first electronic pump P1 fails: the first electronic pump P1 is stopped, the second electronic pump P2 operates in clockwise rotation mode, and the first one-way valve V1 and the fourth one-way valve V4 are in the open state, while the second one-way valve V2 and the third one-way valve V3 are in the connected state; at this time, the oil circuit is: oil pan O → oil filter L → second one-way valve V2 → first electronic pump P1 → third one-way valve V3 → lubrication pipeline and lubrication point R; like Figure 8 As shown, when the second electronic pump P2 fails: the second electronic pump P2 is stopped, the first electronic pump P1 operates in clockwise rotation mode, and the third check valve V3 and the fourth check valve V4 are in the open state, while the first check valve V1 and the second check valve V2 are in the connected state; at this time, the oil circuit is: oil pan O → oil filter L → second check valve V2 → first check valve V1 → first electronic pump P1 → lubrication pipeline and lubrication point R.

[0039] In fault limp mode, the system is supplied with oil independently by a single pump to ensure the basic lubrication needs of the transmission when driving at low speeds and to prevent damage to components.

[0040] [Third Embodiment] The third embodiment of the present invention also provides a control method for the lubrication system mentioned in the second embodiment, comprising the following steps: S100: Confirm the system operating mode based on the test results: When the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold is satisfied: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode. S200: Controls the electronic pump and check valve accordingly in the corresponding operating mode: When the system operates in parallel mode at normal temperature, both the first and second electronic pumps are controlled to rotate clockwise, and the first, second, and third check valves are controlled to be in the connected state, while the fourth check valve is in the disconnected state. At this time, the oil circuit is: oil pan → oil filter → second check valve → second electronic pump → third check valve → lubrication line and lubrication point; and oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point. When the system operates in low-temperature series mode, the first electronic pump is controlled to operate in clockwise rotation mode, the second electronic pump is controlled to operate in counterclockwise rotation mode, and the first and fourth check valves are controlled to be in the connected state, while the second and third check valves are in the disconnected state; at this time, the oil circuit is: oil pan → oil filter → fourth check valve → second electronic pump → first check valve → first electronic pump → lubrication line and lubrication point; When the system is operating in fault limp mode When the first electronic pump fails: the first electronic pump is stopped, the second electronic pump operates in clockwise rotation mode, and the first and fourth check valves are kept in the open state, while the second and third check valves are kept in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first electronic pump → third check valve → lubrication line and lubrication point; When the second electronic pump fails: the second electronic pump is stopped, the first electronic pump operates in clockwise rotation mode, and the third and fourth check valves are kept in the open state, while the first and second check valves are in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lubrication system, the system comprising: An oil pan, the interior of which is filled with lubricating oil; An oil filter, wherein the oil filter is disposed inside the oil pan and its inlet is connected to the inside of the oil pan; An electronic pump module, wherein the outlet of the oil filter is connected to the inlet of the electronic pump module; The lubrication pipeline and lubrication point are connected to the outlet of the electronic pump module, and the lubricating oil after lubrication can flow back into the oil pan. Its features are: The electronic pump module includes: An electronic pump is provided, wherein the outlet of the oil filter is optionally connected to the electronic pump via a second or fourth check valve; and the outlet of the electronic pump is optionally connected to the lubrication pipeline and lubrication point via a first or third check valve. The electronic pump can operate in both clockwise and counterclockwise rotation modes; The first check valve, the second check valve, the third check valve, and the fourth check valve can control the opening and closing of the corresponding oil circuit by their own on / off states. The system can switch between different operating modes of the lubrication system according to the current driving conditions of the vehicle by switching the rotation mode of the electronic pump and controlling the on / off state of the first, second, third, and fourth one-way valves.

2. The lubrication system according to claim 1, characterized in that: When the vehicle is in forward motion, the electronic pump is controlled to rotate clockwise, and the first and fourth check valves are kept in the off state, while the second and third check valves are kept in the connected state. At this time, the oil circuit is: oil pan → oil filter → second check valve → electronic pump → third check valve → lubrication line and lubrication point.

3. A lubrication system according to claim 1, characterized in that: When the vehicle is in reverse, the electronic pump is in counter-clockwise rotation mode, and the first and fourth check valves are connected, while the second and third check valves are disconnected. At this time, the oil circuit is: oil pan → oil filter → fourth check valve → electronic pump → first check valve → lubrication line and lubrication point.

4. A lubrication system, the system comprising: An oil pan, the interior of which is filled with lubricating oil; An oil filter, wherein the oil filter is disposed inside the oil pan and its inlet is connected to the inside of the oil pan; A dual electronic pump module, wherein the outlet of the oil filter is connected to the inlet of the dual electronic pump module; The lubrication pipeline and lubrication point are connected to the outlet of the dual electronic pump module, and the lubricating oil after lubrication can flow back into the oil pan. Its features are: The dual electronic pump module includes: The first electronic pump, wherein the outlet of the oil filter is optionally connected to the first electronic pump via a second check valve or a fourth check valve; The outlet of the first electronic pump is optionally connected to the second electronic pump via a first check valve or a third check valve. Both the first and second electronic pumps are capable of operating in clockwise and counterclockwise rotation modes. The first check valve, the second check valve, the third check valve, and the fourth check valve can control the opening and closing of the corresponding oil circuit by their own on / off states. The system also includes an oil temperature sensor connected to the oil circuit, and a pressure sensor and a speed sensor connected to each electronic pump. The fault detection module is connected to the pressure sensor and the speed sensor respectively. By comparing the real-time oil temperature detected by the oil temperature sensor with a preset threshold and the detection results of the fault detection module, the system can switch between different working modes of the lubrication system through the rotation mode switching of the first electronic pump and the second electronic pump, and the on / off control of the first check valve, the second check valve, the third check valve and the fourth check valve.

5. A lubrication system according to claim 4, characterized in that: The system is capable of operating in at least the following modes: normal temperature parallel mode, low temperature series mode, and fault limp mode.

6. A lubrication system according to claim 5, characterized in that: When the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold is satisfied: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode.

7. A lubrication system according to claim 6, characterized in that: When the system operates in parallel mode at room temperature, the first and second electronic pumps are controlled to operate in clockwise rotation mode, and the first, second, and third check valves are controlled to be in a connected state, while the fourth check valve is in a disconnected state. At this time, the oil circuit is: oil pan → oil filter → second check valve → second electronic pump → third check valve → lubrication pipeline and lubrication point; and oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication pipeline and lubrication point.

8. A lubrication system according to claim 6, characterized in that: When the system operates in low-temperature series mode, the first electronic pump is controlled to operate in clockwise rotation mode, the second electronic pump is controlled to operate in counterclockwise rotation mode, and the first and fourth check valves are controlled to be in the connected state, while the second and third check valves are in the disconnected state; at this time, the oil circuit is: oil pan → oil filter → fourth check valve → second electronic pump → first check valve → first electronic pump → lubrication pipeline and lubrication point.

9. A lubrication system according to claim 6, characterized in that: When the system operates in fault limp mode When the first electronic pump fails: the first electronic pump is stopped, the second electronic pump operates in clockwise rotation mode, and the first and fourth check valves are kept in the open state, while the second and third check valves are kept in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first electronic pump → third check valve → lubrication line and lubrication point; When the second electronic pump fails: the second electronic pump is stopped, the first electronic pump operates in clockwise rotation mode, and the third and fourth check valves are kept in the open state, while the first and second check valves are in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point.

10. A control method for a lubrication system according to any one of claims 6-9, characterized in that: Includes the following steps: S100: Confirm the system operating mode based on the test results: When the relationship between the real-time oil temperature detected by the oil temperature sensor and the preset threshold is satisfied: When the real-time oil temperature is greater than or equal to the preset threshold, the control system enters the normal temperature parallel mode; When the real-time oil temperature is less than the preset threshold, the control system enters the low-temperature series mode, and then switches to the parallel mode when the oil temperature rises to the preset threshold. When the pressure sensor detects an abnormal pressure in the corresponding electronic pump or the speed sensor detects an abnormal speed in the corresponding electronic pump, the fault detection module determines that the corresponding electronic pump is faulty, and the control system enters fault limp mode. S200: Controls the electronic pump and check valve accordingly in the corresponding operating mode: When the system operates in parallel mode at normal temperature, both the first and second electronic pumps are controlled to rotate clockwise, and the first, second, and third check valves are controlled to be in the connected state, while the fourth check valve is in the disconnected state. At this time, the oil circuit is: oil pan → oil filter → second check valve → second electronic pump → third check valve → lubrication line and lubrication point; and oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point. When the system operates in low-temperature series mode, the first electronic pump is controlled to operate in clockwise rotation mode, the second electronic pump is controlled to operate in counterclockwise rotation mode, and the first and fourth check valves are controlled to be in the connected state, while the second and third check valves are in the disconnected state; at this time, the oil circuit is: oil pan → oil filter → fourth check valve → second electronic pump → first check valve → first electronic pump → lubrication line and lubrication point; When the system is operating in fault limp mode When the first electronic pump fails: the first electronic pump is stopped, the second electronic pump operates in clockwise rotation mode, and the first and fourth check valves are kept in the open state, while the second and third check valves are kept in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first electronic pump → third check valve → lubrication line and lubrication point; When the second electronic pump fails: the second electronic pump is stopped, the first electronic pump operates in clockwise rotation mode, and the third and fourth check valves are kept in the open state, while the first and second check valves are in the connected state; at this time, the oil circuit is: oil pan → oil filter → second check valve → first check valve → first electronic pump → lubrication line and lubrication point.

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