A lubrication control method for a driving motor of a new energy vehicle and a new energy vehicle

Abstract

The application relates to a lubrication control method of a new energy vehicle driving motor and a new energy vehicle. The current accumulated driving parameter and the accumulated driving parameter after the last lubrication operation are obtained. When the difference between the current accumulated driving parameter and the accumulated driving parameter after the last lubrication operation reaches a preset parameter difference threshold, a lubrication control system performs a lubrication operation on a grease lubricated bearing of the driving motor, and the current accumulated driving parameter is set as the accumulated driving parameter after the last lubrication operation after the lubrication operation is performed. Intelligent lubrication control of the new energy vehicle driving motor is realized, the service life of the driving motor is prolonged, the vehicle demand is met, the vehicle artificial maintenance cost and the operation cost are reduced.

Description

Technical Field

[0001] This invention relates to a lubrication control method for a drive motor in a new energy vehicle and to a new energy vehicle, belonging to the field of new energy vehicles. Background Technology

[0002] Currently, both the front and rear bearings of drive motors in new energy vehicles use grease-lubricated bearings. However, as the bearing temperature rises during prolonged operation, the grease can easily overflow, especially in high-speed motors which require long-term high-speed operation. The grease life of these bearings may not meet the design requirements of drive motors in new energy vehicles. Therefore, drive motors in new energy vehicles require regular inspection and bearing replacement. Furthermore, the operating conditions of drive motors are not only complex but also harsh, necessitating a long lifespan design for the drive motor during the overall vehicle design phase. The lifespan of the grease-lubricated bearings is a major factor affecting the lifespan of drive motors.

[0003] The published text of patent application CN111174075A discloses a centralized lubrication control system, method, and engineering vehicle. In this system, the controller controls the opening of the electronically controlled flow regulating valve based on the signal returned by the pressure sensor. Simultaneously, it can monitor the pressure fluctuations in the lubrication pipeline to determine whether the oil circuit is working properly. When the controller starts the electric lubrication pump, the pressure reversing valve receives pressure and is activated. At the same time, the controller controls the electronically controlled flow regulating valve to open, connecting the oil circuit to the distributor to realize electric lubrication operation. It can be seen that the system relies on the pressure signal fed back by the pressure sensor to determine whether the oil circuit is normal. This makes the electric lubrication operation dependent on the pressure sensor, which places high accuracy requirements on the pressure sensor. In addition, the sensitivity of the pressure sensor varies among different vehicles, which means that centralized lubrication cannot meet the needs of every engineering vehicle.

[0004] The published text of patent application CN117450412A discloses a centralized lubrication control method for multi-unit vehicles. In this method, based on a preset pumping cycle, an oil pump injects oil into lubrication points via a distributor. The pumping cycle is determined based on vehicle driving time and mileage. While this achieves lubrication control and triggering of lubrication point injection in the field of new energy vehicles, it lacks data interaction with the vehicle controller or motor controller during lubrication, raising concerns about the real-time nature of lubrication triggering conditions. Furthermore, the concept of "lubrication point" is too broad, failing to clearly define its definition or specific location, thus failing to address lubrication control for drive motors. Therefore, there is an urgent need for a lubrication control method and system for grease-lubricated bearings used in drive motors of new energy vehicles. Summary of the Invention

[0005] The purpose of this invention is to provide a lubrication control method for a drive motor in a new energy vehicle and a new energy vehicle, so as to realize intelligent lubrication control of the drive motor in a new energy vehicle, improve the service life of the drive motor, and meet the requirements of the whole vehicle.

[0006] To achieve the above objectives, on the one hand, this invention proposes a lubrication control method for a drive motor used in new energy vehicles. Get the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation; When the system determines that the vehicle has traveled a certain distance and / or a certain amount of time since the last lubrication operation based on the previous cumulative driving parameters and the cumulative driving parameters since the last lubrication operation, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor, and sets the current cumulative driving parameters to the cumulative driving parameters since the most recent lubrication operation after the lubrication operation is performed.

[0007] Furthermore, the cumulative driving parameters include cumulative mileage and cumulative running time; When the difference between the current cumulative mileage and the cumulative mileage after the last lubrication operation reaches the preset mileage difference threshold, it is considered that the vehicle has traveled a certain mileage since the last lubrication operation. When the difference between the current cumulative running time and the cumulative running time since the last lubrication operation reaches a preset time difference threshold, it is considered that the vehicle has been running for a certain period of time since the last lubrication operation.

[0008] Furthermore, the lubrication control system is connected to the vehicle controller via a CAN network, and the vehicle controller is also connected to the motor controller via a CAN network. The lubrication control system obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller via the CAN network.

[0009] Furthermore, the lubrication operation involves pumping lubricating grease through a centralized lubricating oil pump via oil pipes and front and rear end cap oil passages to the inside of the drive motor bearing.

[0010] Furthermore, when the vehicle is in non-drive mode, in response to the triggering of the lubrication operation button, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor, and acquires the cumulative driving parameters when the lubrication operation was triggered after the lubrication operation is performed. Set the cumulative driving parameters when the lubrication operation is triggered to the cumulative driving parameters after the most recent lubrication operation.

[0011] On the other hand, the present invention proposes a new energy vehicle, including a vehicle controller, a motor controller and a lubrication controller; The lubrication controller obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller. When it is determined, based on the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation, that the vehicle has traveled a certain mileage since the last lubrication operation and / or that the vehicle has traveled a certain time since the last lubrication operation, the lubrication controller performs a lubrication operation on the grease-lubricated bearing of the drive motor in the motor controller. After the lubrication operation is performed, the current cumulative driving parameters are set to the cumulative driving parameters since the most recent lubrication operation.

[0012] Furthermore, the cumulative driving parameters include cumulative mileage and cumulative running time; When the difference between the current cumulative mileage and the cumulative mileage after the last lubrication operation reaches the preset mileage difference threshold, it is considered that the vehicle has traveled a certain mileage since the last lubrication operation. When the difference between the current cumulative running time and the cumulative running time since the last lubrication operation reaches a preset time difference threshold, it is considered that the vehicle has been running for a certain period of time since the last lubrication operation.

[0013] Furthermore, the lubrication controller is connected to the vehicle controller via a CAN network, and the vehicle controller is also connected to the motor controller via a CAN network; The lubrication controller obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller via the CAN network.

[0014] Furthermore, the lubrication operation involves pumping lubricating grease through a centralized lubricating oil pump via oil pipes and front and rear end cap oil passages to the inside of the drive motor bearing.

[0015] Furthermore, when the vehicle is in non-drive mode, in response to the triggering of the lubrication operation button, the lubrication controller performs a lubrication operation on the grease-lubricated bearing of the drive motor, and obtains the cumulative driving parameters when the lubrication operation was triggered after the lubrication operation is performed; Set the cumulative driving parameters when the lubrication operation is triggered to the cumulative driving parameters after the most recent lubrication operation.

[0016] The beneficial effects of this invention are as follows: by acquiring the current cumulative driving parameters and the cumulative driving parameters after the last lubrication operation; when it is determined, based on the current cumulative driving parameters and the cumulative driving parameters after the last lubrication operation, that the vehicle has traveled a certain mileage and / or a certain time since the last lubrication operation, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor, and sets the current cumulative driving parameters to the cumulative driving parameters after the most recent lubrication operation after the lubrication operation, thereby realizing intelligent lubrication control of the drive motor for new energy vehicles, thus improving the service life of the drive motor, meeting the needs of the whole vehicle, and reducing the labor maintenance costs and operating costs of the whole vehicle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the CAN network communication connection in a practical application scenario of a lubrication control method for a drive motor in a new energy vehicle, which is one aspect of the present invention. Figure 2 This is a flowchart illustrating a lubrication control method for a drive motor in a new energy vehicle, one aspect of the present invention, in a practical application scenario. Figure 3 A schematic diagram of the connection between the lubrication controller and the drive motor in a practical application scenario of a new energy vehicle, according to another aspect of the present invention; Figure label: 1-Drive motor front cover; 2-Motor rear cover; 3-Motor bearing; 4-Oil pipe; 5-Centralized lubricating oil pump; 6-Lubricating oil pump controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The inventive concept of this invention is to acquire the current cumulative driving parameters and the cumulative driving parameters after the last lubrication operation in real time, and to perform a lubrication operation on the grease-lubricated bearing of the drive motor when the difference between the current parameters and the parameters after the last lubrication operation meets a preset threshold, so as to provide intelligent lubrication operation for the drive motor. The lubrication process does not require manual detection and continuously keeps the grease-lubricated bearing of the drive motor smooth, thereby improving the service life of the drive motor and further meeting the needs of the whole vehicle.

[0020] Method Example 1: On one hand, this invention proposes a lubrication control method for a drive motor in a new energy vehicle, including steps S11 and S12, specifically: Step S11: Obtain the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation. It should be noted that the lubrication control system is connected to the vehicle controller via a CAN network, and the vehicle controller is also connected to the motor controller via the CAN network. The lubrication control system obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller based on the CAN network. The cumulative driving parameters include, but are not limited to, cumulative mileage or cumulative running time. Mileage refers to the cumulative mileage of the entire vehicle; running time refers to the cumulative running time of the drive motor. This achieves the acquisition of cumulative driving parameters based on CAN network communication, improving the accuracy of the cumulative driving parameters and providing accurate data support for subsequent lubrication operation judgments.

[0021] like Figure 1 The diagram illustrates a CAN network communication connection in a practical application scenario for a lubrication control method for a drive motor in a new energy vehicle, according to one aspect of the present invention. The lubrication control system (LCS) communicates with the vehicle controller (VCU) and the motor controller (MCU) via a CAN network. The LCS reads the vehicle's real-time cumulative mileage and drive motor running time from the VCU through the CAN network. Simultaneously, the LCS's operating mode and status are also sent to the VCU via the CAN network, enabling the instrument cluster connected to the VCU to display the specific functional status of the LCS.

[0022] Step S12: When the vehicle has traveled a certain mileage and / or a certain time since the last lubrication operation is determined based on the current cumulative driving parameters and the cumulative driving parameters after the last lubrication operation, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor. After the lubrication operation is performed, the current cumulative driving parameters are set to the cumulative driving parameters after the most recent lubrication operation. Here, the lubrication operation refers to the lubricating grease being pumped into the drive motor bearing through the oil pipe and the oil passage of the front and rear end caps by the centralized lubricating oil pump, thereby realizing the execution conditions for triggering the lubrication operation and accurately lubricating the grease-lubricated bearing of the drive motor.

[0023] It should be noted that when the cumulative driving parameters are cumulative mileage and cumulative running time, the determination in step S12 of whether the vehicle has traveled a certain mileage and / or a certain time since the last lubrication operation based on the current cumulative driving parameters and the cumulative driving parameters after the last lubrication operation includes: the difference between the current cumulative mileage and the cumulative mileage after the last lubrication operation reaches a preset mileage difference threshold, indicating that the vehicle has traveled a certain mileage since the last lubrication operation; the difference between the current cumulative running time and the cumulative running time after the last lubrication operation reaches a preset time difference threshold, indicating that the vehicle has traveled a certain time since the last lubrication operation.

[0024] Through the above steps S11-S12, the lubrication control system reads the cumulative driving parameters through the CAN network and determines whether the vehicle has traveled a certain mileage and / or a certain time since the last lubrication operation. When any parameter in the cumulative driving parameters is detected to meet the triggering condition for the lubrication operation, the lubrication control system executes the lubrication operation. This rationally and efficiently utilizes CAN network communication to achieve data interaction between the vehicle controller and the lubrication controller system, and performs precise and intelligent lubrication operations on the drive motor.

[0025] In a preferred embodiment of the invention, the cumulative driving parameters preferably include cumulative mileage and cumulative running time; a CAN network communication connection is established between the lubrication control system, the vehicle controller, and the motor controller; based on the CAN network communication, the lubrication control system obtains the current cumulative mileage s1, the current cumulative running time t1, the cumulative mileage s0 since the last lubrication operation, and the cumulative running time t0 since the last lubrication operation from the vehicle controller; calculates the mileage difference δs between the current cumulative mileage s1 and the cumulative mileage s0 since the last lubrication operation, and the time difference δt between the current cumulative running time t1 and the cumulative running time t0 since the last lubrication operation; the preset mileage difference threshold is S, and the time difference threshold is T.

[0026] When δs equals S and δt does not equal T, it is considered that a certain mileage has been reached; when δs does not equal S and δt equals T, it is considered that a certain time has been reached; or when δs equals S and δt equals T, it is considered that a certain mileage and a certain time have been reached. This triggers the lubrication control system to perform a lubrication operation on the grease-lubricated bearing of the drive motor. Specifically, the lubricating grease is pumped into the drive motor bearing through a centralized lubrication oil pump via oil pipes and oil passages at the front and rear end covers. Furthermore, the current cumulative mileage s1 is updated to the cumulative mileage since the most recent lubrication operation, and the current cumulative running time t1 is updated to the cumulative mileage and time since the most recent lubrication operation, for use in calculating the next lubrication operation trigger.

[0027] Method Example 2: Following the above embodiments of the present invention, in the lubrication control method for a drive motor for a new energy vehicle proposed by the present invention, the lubrication control system will also determine the operating mode of the vehicle. When the vehicle is in non-drive mode, in response to the triggering of the lubrication operation button, the lubrication control system will perform a lubrication operation on the grease-lubricated bearing of the drive motor, and obtain the cumulative driving parameters when the lubrication operation is triggered after the lubrication operation is performed.

[0028] The cumulative driving parameters when triggering the lubrication operation are set to the cumulative driving parameters after the most recent lubrication operation, enabling manual lubrication triggering even in non-drive mode, and achieving comprehensive lubrication control of the drive motor.

[0029] Meanwhile, in practical applications, when the vehicle is powered on at low voltage, the lubrication control system initiates a system self-check. If the self-check detects a fault in the lubrication control system, such as insufficient grease, the specific fault information or status will be sent to the vehicle controller via the vehicle's CAN network and displayed on the instrument cluster to remind the driver to perform maintenance.

[0030] like Figure 2 The diagram shown is a flowchart of a lubrication control method for a drive motor in a new energy vehicle according to one aspect of the present invention in a practical application scenario. When the vehicle is powered on at low voltage, the lubrication control system starts a self-test. If the self-test detects a fault in the lubrication control system, it is sent to the vehicle controller via CAN network communication to display the fault information on the instrument cluster.

[0031] If the lubrication control system performs a normal self-check, it determines the vehicle's drive mode. When the vehicle is in drive mode, the lubrication control system enters automatic lubrication mode. Specifically, the lubrication control system obtains the current cumulative mileage S1 and current cumulative running time T1 via the CAN network, as well as the cumulative mileage S0 and cumulative running time T0 since the last lubrication operation. When the difference between the cumulative mileage S1 and the cumulative mileage S0 since the last lubrication operation equals the preset mileage difference threshold s (i.e., S1 - S0 = s), the lubrication control system automatically performs lubrication and simultaneously re-records and stores the current vehicle driving parameters; that is, the cumulative mileage value S0 is updated to the value S1, and the cumulative running time value T0 is updated to the value T1. When the difference between the cumulative mileage T1 and the cumulative running time T0 since the last lubrication operation equals the preset time difference threshold t (i.e., T1 - T0 = t), the lubrication control system automatically performs lubrication and simultaneously re-records and stores the current vehicle driving parameters. Specifically, the cumulative mileage value S0 is updated to value S1, and the cumulative running time value T0 is updated to value T1. Here, the lubrication control system program pre-sets an OR relationship between mileage and running time, with the earlier value taking precedence. The mileage and time data recorded and stored after lubrication are simultaneously updated.

[0032] When the vehicle is in non-drive mode, the lubrication control system can enter manual maintenance mode. Press the manual lubrication operation button, and the lubrication control system will perform lubrication. After lubrication, the recorded mileage and time data will be updated. In manual maintenance mode, the lubrication control system can also be debugged or repaired.

[0033] Example 1 of new energy vehicles: Another invention proposes a new energy vehicle, including a vehicle controller, a motor controller, and a lubrication controller, to realize the above-mentioned lubrication control method for a drive motor of a new energy vehicle.

[0034] like Figure 3 The diagram shows a structural schematic of the connection between the lubrication controller and the drive motor in a practical application scenario of a new energy vehicle according to another aspect of the present invention. The grease passages of the front and rear covers (1 and 2) of the drive motor are connected to the centralized lubrication pump 5 through the oil pipe 4. The lubrication pump controller 6 is fixedly installed on the integrated lubrication pump 5. The grease is pumped into the motor bearing 3 through the centralized lubrication pump 5 via the oil pipe 4 and the oil passages of the front and rear covers (1 and 2) of the drive motor, so as to achieve sufficient lubrication of the motor bearing.

[0035] In summary, the lubrication control system communicates with the vehicle controller via a CAN network, and the vehicle controller communicates with the motor controller. After the vehicle is powered on, when the vehicle controller is detected to be in drive mode, the lubrication system automatically enters automatic mode. The lubrication control system reads the vehicle's cumulative mileage and cumulative running time via the CAN network, and determines whether the difference between the vehicle's cumulative mileage and the cumulative mileage since the last lubrication operation reaches a preset mileage difference threshold. Simultaneously, it determines whether the difference between the vehicle's cumulative running time and the cumulative running time since the last lubrication operation reaches a preset time difference threshold. When either the cumulative mileage or cumulative running time condition is met, the lubrication system performs lubrication and records and stores the current vehicle mileage and running time. When the vehicle is determined to be in non-drive mode, the lubrication control system can enter manual mode, where lubrication adjustments can be performed manually via buttons, and the current vehicle mileage and running time are recorded and stored.

Claims

1. A lubrication control method for a drive motor in a new energy vehicle, characterized in that, Get the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation; When the system determines that the vehicle has traveled a certain distance and / or a certain amount of time since the last lubrication operation based on the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor, and sets the current cumulative driving parameters to the cumulative driving parameters since the most recent lubrication operation after the lubrication operation is performed.

2. The lubrication control method for a drive motor in a new energy vehicle according to claim 1, characterized in that, The cumulative driving parameters include cumulative mileage and cumulative running time; When the difference between the current cumulative mileage and the cumulative mileage after the last lubrication operation reaches the preset mileage difference threshold, it is considered that the vehicle has traveled a certain mileage since the last lubrication operation. When the difference between the current cumulative running time and the cumulative running time since the last lubrication operation reaches a preset time difference threshold, it is considered that the vehicle has been running for a certain period of time since the last lubrication operation.

3. The lubrication control method for a drive motor in a new energy vehicle according to claim 1, characterized in that, The lubrication control system is connected to the vehicle controller via a CAN network, and the vehicle controller is also connected to the motor controller via a CAN network. The lubrication control system obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller via the CAN network.

4. The lubrication control method for a drive motor in a new energy vehicle according to claim 1, characterized in that, The lubrication operation involves pumping grease through a centralized lubricating oil pump via oil pipes and front and rear end cap oil passages to the inside of the drive motor bearing.

5. The lubrication control method for a drive motor in a new energy vehicle according to claim 1, characterized in that, When the vehicle is in non-drive mode, in response to the triggering of the lubrication operation button, the lubrication control system performs a lubrication operation on the grease-lubricated bearing of the drive motor, and obtains the cumulative driving parameters when the lubrication operation was triggered after the lubrication operation is performed. Set the cumulative driving parameters when the lubrication operation is triggered to the cumulative driving parameters after the most recent lubrication operation.

6. A new energy vehicle, characterized in that, This includes the vehicle controller, motor controller, and lubrication controller; The lubrication controller obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller. When it is determined, based on the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation, that the vehicle has traveled a certain mileage since the last lubrication operation and / or that the vehicle has traveled a certain time since the last lubrication operation, the lubrication controller performs a lubrication operation on the grease-lubricated bearing of the drive motor in the motor controller. After the lubrication operation is performed, the current cumulative driving parameters are set to the cumulative driving parameters since the most recent lubrication operation.

7. The new energy vehicle according to claim 6, characterized in that, The cumulative driving parameters include cumulative mileage and cumulative running time; When the difference between the current cumulative mileage and the cumulative mileage after the last lubrication operation reaches a preset mileage difference threshold, it is considered that the vehicle has traveled a certain mileage since the last lubrication operation; when the difference between the current cumulative running time and the cumulative running time after the last lubrication operation reaches a preset time difference threshold, it is considered that the vehicle has traveled a certain time since the last lubrication operation.

8. The new energy vehicle according to claim 6, characterized in that, The lubrication controller is connected to the vehicle controller via a CAN network, and the vehicle controller is also connected to the motor controller via a CAN network. The lubrication controller obtains the current cumulative driving parameters and the cumulative driving parameters since the last lubrication operation from the vehicle controller via the CAN network.

9. The new energy vehicle according to claim 6, characterized in that, The lubrication operation involves pumping grease through a centralized lubricating oil pump via oil pipes and front and rear end cap oil passages to the inside of the drive motor bearing.

10. The new energy vehicle according to claim 6, characterized in that, When the vehicle is in non-drive mode, in response to the triggering of the lubrication operation button, the lubrication controller performs a lubrication operation on the grease-lubricated bearing of the drive motor, and obtains the cumulative driving parameters when the lubrication operation was triggered after the lubrication operation is performed. Set the cumulative driving parameters when the lubrication operation is triggered to the cumulative driving parameters after the most recent lubrication operation.

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