A method and device for evaluating the oil change cycle of a gearbox based on operating load, medium and equipment

Abstract

The application discloses a kind of based on operating load's gearbox oil change cycle evaluation method, device, medium and equipment, belongs to engineering machinery technical field.It includes: obtaining the operating load spectrum of each gear of gearbox;Calculate the evaluation value of the total content of metal particles of gearbox oil caused by the operation of each gear of gearbox;Calculate the total growth rate evaluation value of the content of metal particles of gearbox oil caused by the operation of each gear in fixed time;According to the evaluation value of the total content of metal particles and the total growth rate evaluation value of the content of metal particles, determine the residual life evaluation value of gearbox oil, based on the residual life evaluation value of gearbox oil Determine the power source operating time when gearbox oil needs to be replaced.The application can avoid the waste of oil or the service life of oil, reduce the maintenance cost of gearbox on the basis of guaranteeing reliable operation.

Description

Technical Field

[0001] This invention relates to a method, apparatus, medium, and equipment for assessing transmission oil change intervals based on operating load, belonging to the field of engineering machinery technology. Background Technology

[0002] In existing technologies, online sensor-based oil change cycle assessment schemes require the installation of multi-parameter sensors such as viscosity, moisture, and particle size in the transmission fluid circuit, and data analysis and life prediction using models such as neural networks. This type of scheme has high initial hardware investment and installation and maintenance costs, and the long-term reliability of the sensors in the harsh operating environments of construction machinery is difficult to guarantee. Neural network models are essentially "black boxes" with poor physical interpretability and difficult-to-trace internal reasoning logic. When adapting to different transmission models, a large amount of labeled data needs to be collected and retrained, resulting in high model transfer costs.

[0003] Some methods use oil viscosity as the criterion for oil change, but viscosity is a physicochemical indicator, and its changes often lag behind the abnormal growth of wear particles, making it difficult to detect sudden mechanical wear failures in the early stages. Furthermore, this method only utilizes data from neutral driving conditions and does not cover the differentiated impact of different gears and torque on oil degradation under actual load conditions. Another method uses data-driven modeling based on vehicle maintenance records and monitoring parameters to predict oil change intervals, but it does not incorporate actual transmission operating condition information and cannot reflect the impact of transmission load differences under different operating intensities on oil degradation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the problems of low evaluation accuracy, high system cost and poor model interpretability in the prior art, and to provide a method, device, medium and equipment for evaluating transmission oil change cycle based on operating load.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution.

[0006] In a first aspect, the present invention discloses a method for evaluating transmission oil change intervals based on operating load, comprising:

[0007] Obtain the operating load spectrum for each gear of the transmission;

[0008] Based on the collected transmission input speed and transmission input torque corresponding to any gear of the transmission, calculate the total running time of any gear at each working point in the operating load spectrum.

[0009] Based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points is calculated.

[0010] The total metal particulate matter content in the transmission fluid caused by the operation of each gear is calculated based on the calculated metal particulate matter content of each gear.

[0011] Obtain the pre-calculated growth rate assessment value of the metal particulate matter content in the transmission fluid generated during the fixed time of operation at all load spectrum conditions in any given gear.

[0012] The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value.

[0013] The remaining life assessment value of the transmission fluid is determined based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particles. Based on the remaining life assessment value of the transmission fluid, the power source operating time when the transmission fluid needs to be replaced is determined.

[0014] Furthermore, obtaining the operating load spectrum of each gear in the transmission includes:

[0015] For any gear in the transmission, the operating range of the transmission's input speed is divided into fixed intervals. The transmission input torque operating range is divided into several intervals. Each interval forms a region with * Operating load spectrum at each working point, using This represents the various operating conditions of each operating load spectrum, where 1 ≤ ≤ ,1≤ ≤ .

[0016] Furthermore, the acquisition of the transmission input torque includes:

[0017] If the transmission's drive source is a drive motor, the actual torque of the drive motor is read and used as the transmission's input torque. ;

[0018] If the transmission is driven by an engine and is not equipped with a torque converter, read the actual torque percentage of the engine. Through formula Calculate the actual engine torque ,in, The maximum torque value of the engine, the actual torque of the engine As the input torque of the transmission ;

[0019] If the transmission's drive source is an engine and it is equipped with a torque converter, the pump impeller speed of the torque converter is the same as the engine speed. The pump impeller speed is determined based on the engine speed signal. The turbine speed of the hydraulic torque converter is determined by a speed sensor. According to the formula Turbine torque was calculated ,in, The torque ratio of the hydraulic torque converter. The torque coefficient is the torque coefficient when the pump impeller speed is 1000 rpm, and the turbine torque is... As the input torque of the transmission .

[0020] Furthermore, the calculation of the total running time of any gear at each operating point in the operating load spectrum includes:

[0021] Collect the transmission input speed corresponding to gear G. and transmission input torque According to the input speed of the gearbox and transmission input torque Confirm the operating point in the load spectrum of gear G. ;

[0022] Statistics on the first running time The first running time The operating point of the transmission in gear G. runtime;

[0023] Adding the first running time after each transmission fluid change The gear G is obtained at the operating point. Total runtime .

[0024] Furthermore, the process of obtaining the evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated during the fixed time of operation at all load spectrum operating points in any gear includes:

[0025] Statistics on the second running time The second running time for Gear G at the operating point within the time range runtime in For the operating time of the power source;

[0026] Based on the second running time And the second running time Changes in the content of metal particles within Calculate the growth rate assessment value of the metal particulate matter content in the transmission fluid generated by gear G operating for a fixed time N at all load spectrum conditions. .

[0027] Furthermore, the formula for calculating the remaining life assessment value of the transmission fluid is as follows:

[0028] ;

[0029] In the formula, This is the remaining life assessment value for the transmission fluid. To ensure that the reliability of the transmission is not affected, the maximum value of metal particulate matter content in the transmission fluid is required. This is an assessment value for the total content of metal particles in the transmission fluid caused by the operation of each gear in the transmission. The total growth rate of metal particulate matter content in transmission fluid is the assessed value, where N is a fixed time.

[0030] Furthermore, the formula for calculating the power source operating time when the transmission fluid needs to be changed is as follows:

[0031] ;

[0032] In the formula, This refers to the operating time of the power source when the transmission fluid needs to be changed. For the operating time of the power source, This is the estimated remaining life value for the transmission fluid.

[0033] Secondly, the present invention discloses a transmission oil change cycle assessment device based on operating load, comprising:

[0034] The acquisition module is used to acquire the operating load spectrum of each gear of the transmission;

[0035] The content calculation module is used to calculate the total running time of any gear at each operating point in the operating load spectrum based on the collected transmission input speed and transmission input torque corresponding to any gear of the transmission; based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the module calculates the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points.

[0036] The first evaluation value calculation module is used to calculate the evaluation value of the total metal particulate matter content in the transmission fluid caused by the operation of each gear based on the calculated metal particulate matter content of each gear.

[0037] The second evaluation value calculation module is used to obtain the pre-calculated evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated by running the fixed time at all load spectrum working points in any gear.

[0038] The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value.

[0039] The replacement time determination module is used to determine the remaining life assessment value of the transmission fluid based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particle content, and to determine the power source operating time when the transmission fluid needs to be replaced based on the assessment value of the remaining life of the transmission fluid.

[0040] Thirdly, the present invention discloses a computer-readable storage medium for storing one or more programs, said one or more programs including instructions that, when executed by a computing device, cause the computing device to perform the method of the first aspect.

[0041] Fourthly, the present invention discloses a computer device, comprising,

[0042] One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for performing the method described in the first aspect.

[0043] The beneficial effects achieved by this invention are as follows:

[0044] This invention, based on existing electronic control systems, designs a method for evaluating transmission fluid change cycles based on operating load. This invention collects load spectrum data from each gear of the transmission during operation. Based on the mapping relationship between the load spectrum data and changes in the metal particle content of the transmission fluid, it determines the amount and recent rate of change of the metal particle content in the transmission fluid generated during operation in each gear. It then assesses the time when the metal particle content in the transmission fluid reaches its maximum threshold, thereby determining the remaining service life of the transmission fluid. The specific time for fluid change is determined based on the power source's operating time, thus avoiding the use of fluid with excessive parameters or wasting the fluid's lifespan. This reduces transmission maintenance costs while ensuring reliable operation. Attached Figure Description

[0045] Figure 1This is a schematic diagram of the transmission oil change interval assessment method;

[0046] Figure 2 This is a schematic diagram of the transmission operating load acquisition process;

[0047] Figure 3 This is a schematic diagram illustrating the process for determining the transmission oil change interval. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0049] Example 1: This example introduces a method for evaluating transmission oil change intervals based on operating load, characterized by including:

[0050] Obtain the operating load spectrum for each gear of the transmission;

[0051] Based on the collected transmission input speed and transmission input torque corresponding to any gear of the transmission, calculate the total running time of any gear at each working point in the operating load spectrum.

[0052] Based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points is calculated.

[0053] The total metal particulate matter content in the transmission fluid caused by the operation of each gear is calculated based on the calculated metal particulate matter content of each gear.

[0054] Obtain the pre-calculated growth rate assessment value of the metal particulate matter content in the transmission fluid generated during the fixed time of operation at all load spectrum conditions in any given gear.

[0055] The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value.

[0056] The remaining life assessment value of the transmission fluid is determined based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particles. Based on the remaining life assessment value of the transmission fluid, the power source operating time when the transmission fluid needs to be replaced is determined.

[0057] In this embodiment, obtaining the operating load spectrum of each gear of the transmission includes:

[0058] For any gear in the transmission, the operating range of the transmission's input speed is divided into fixed intervals. The transmission input torque operating range is divided into several intervals. Each interval forms a region with * Operating load spectrum at each working point, using This represents the various operating conditions of each operating load spectrum, where 1 ≤ ≤ ,1≤ ≤ .

[0059] In this embodiment, the acquisition of the transmission input torque includes:

[0060] If the transmission's drive source is a drive motor, the actual torque of the drive motor is read and used as the transmission's input torque. ;

[0061] If the transmission is driven by an engine and is not equipped with a torque converter, read the actual torque percentage of the engine. Through formula Calculate the actual engine torque ,in, The maximum torque value of the engine, the actual torque of the engine As the input torque of the transmission ;

[0062] If the transmission's drive source is an engine and it is equipped with a torque converter, the pump impeller speed of the torque converter is the same as the engine speed. The pump impeller speed is determined based on the engine speed signal. The turbine speed of the hydraulic torque converter is determined by a speed sensor. According to the formula Turbine torque was calculated ,in, The torque ratio of the hydraulic torque converter. The torque coefficient is the torque coefficient when the pump impeller speed is 1000 rpm, and the turbine torque is... As the input torque of the transmission .

[0063] In this embodiment, calculating the total running time of any gear at each operating point in the operating load spectrum includes:

[0064] Collect the transmission input speed corresponding to gear G. and transmission input torque According to the input speed of the gearbox and transmission input torque Confirm the operating point in the load spectrum of gear G. ;

[0065] Statistics on the first running time The first running time The operating point of the transmission in gear G. runtime;

[0066] Adding the first running time after each transmission fluid change The gear G is obtained at the operating point. Total runtime .

[0067] In this embodiment, the process of obtaining the evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated during the fixed time of operation at all load spectrum operating points in any gear includes:

[0068] Statistics on the second running time The second running time for Gear G at the operating point within the time range runtime in For the operating time of the power source;

[0069] Based on the second running time And the second running time Changes in the content of metal particles within Calculate the growth rate assessment value of the metal particulate matter content in the transmission fluid generated by gear G operating for a fixed time N at all load spectrum operating points. .

[0070] In this embodiment, the formula for calculating the remaining life assessment value of the transmission fluid is as follows:

[0071] ;

[0072] In the formula, This is the estimated remaining life value for the transmission fluid. To ensure that the reliability of the transmission is not affected, the maximum value of metal particulate matter content in the transmission fluid is required. This is an assessment value for the total content of metal particles in the transmission fluid caused by the operation of each gear in the transmission. The total growth rate of metal particulate matter content in transmission fluid is the assessed value, where N is a fixed time.

[0073] In this embodiment, the formula for calculating the power source operating time when the transmission fluid needs to be changed is as follows:

[0074] ;

[0075] In the formula, This refers to the operating time of the power source when the transmission fluid needs to be changed. For the operating time of the power source, This is the estimated remaining life value for the transmission fluid.

[0076] Example 2, based on the same inventive concept as Example 1, introduces a method for evaluating transmission fluid change intervals based on operating load. This invention collects load spectrum data from each gear of the transmission during operation. Based on the mapping relationship between the load spectrum data and the change in metal particle content in the transmission fluid, it determines the amount and recent rate of change of metal particle content in the transmission fluid generated during operation in each gear. It then assesses the time when the metal particle content in the transmission fluid reaches its maximum threshold, thereby determining the remaining service life of the transmission fluid. The specific time for fluid change is determined based on the power source's operating time, thus avoiding the use of fluid with excessive parameters or wasting the fluid's service life. This reduces transmission maintenance costs while ensuring reliable operation.

[0077] This method is applied to a transmission oil change interval assessment system, which includes a power source, a PCU (Power Control Unit), a transmission, a TCU (Transmission Control Unit), a lever, and a speed sensor.

[0078] The power source is connected to the transmission and PCU. If the power source is an electric motor, the PCU is an MCU (Motor Control Unit), and the motor is rigidly connected to the transmission. If the power source is an engine, the PCU is an ECU (Engine Control Unit), and the engine and transmission can be connected via a torque converter or directly rigidly. The power source provides power for the rotation of the transmission.

[0079] The PCU connects to the power source and the TCU. The PCU can monitor the status of the power source and obtain information such as the current speed, actual torque, and running time. There is CAN (Controller Area Network) communication between the PCU and the TCU, and the PCU transmits information such as the current speed, actual torque, and running time of the power source to the TCU.

[0080] The transmission is connected to the power source and the TCU, receiving torque and speed data from the power source. The transmission contains a shift mechanism that enables functions such as starting, shifting gears, and reversing direction. This shift mechanism is controlled by the TCU.

[0081] The TCU receives signals from the speed sensor to obtain the transmission input speed. The TCU receives CAN signals from the PCU to determine information such as the power source's speed, torque, and operating time. The TCU receives lever signals and can determine transmission fluid changes based on specific combinations and changes in these signals. The TCU sends control signals to the transmission to control starting, shifting, and reversing.

[0082] The lever is connected to the TCU, and the driver can send specific combinations and changes of lever signals to the TCU to notify the TCU to change the transmission fluid.

[0083] The speed sensor is mounted on the transmission to monitor the transmission input speed and transmits the speed signal to the TCU. When the power source is an electric motor or an engine directly connected to the transmission, the transmission input speed can be obtained from the PCU's CAN signal, eliminating the need for a speed sensor.

[0084] The steps of the oil change interval assessment method are as follows: Figure 1 As shown, the detailed process is as follows: Figure 2 and Figure 3 As shown. The specific steps are as follows:

[0085] (1) Divide the operating range of the gearbox input speed into a certain interval. The transmission input torque operating range is divided into several intervals. Each interval forms a region with * The transmission operating load spectrum at each operating point can be used This represents each load spectrum and each operating condition point, where 1 ≤ ≤ ,1≤ ≤ .

[0086] (2) After the TCU determines that the transmission fluid has been changed based on the lever signal, it initializes the transmission by resetting the running time data of each gear at each operating point of the corresponding load spectrum to zero. .

[0087] (3) Confirm that the gearbox enters gear G from other gears based on the control signal sent by the TCU to the gearbox.

[0088] (4) Determine the transmission input speed based on the speed sensor or the PCU's CAN signal. .

[0089] (5) Determine the input torque of the transmission .

[0090] (5-1) If the driving source is a drive motor, read the actual motor torque from the CAN signal sent by the MCU. The actual motor torque at this time is the input torque of the gearbox. .

[0091] (5-2) If the drive source is an engine and it is not equipped with a torque converter, read the actual engine torque percentage from the CAN signal sent by the ECU. And through the formula The current actual torque of the engine is calculated. ,in, This is the engine's maximum torque value, which can be obtained by consulting the engine performance parameters. The actual engine torque at this point... This is the input torque of the transmission. .

[0092] (5-3) If the drive source is an engine and it is equipped with a hydraulic torque converter, the pump impeller speed of the hydraulic torque converter is the same as the engine speed. The pump impeller speed can be determined based on the engine speed signal in the CAN signal sent by the ECU. The turbine speed of the hydraulic torque converter is determined by a speed sensor. The turbine torque was calculated according to the formula. ,in, The torque ratio of the hydraulic torque converter. The torque coefficient at a pump impeller speed of 1000 rpm can be determined by referring to a table. The calculated turbine torque... This is the input torque of the transmission. .

[0093] (6) Based on the input speed and input torque The specific value range is determined by the operating point in the load spectrum of the gear G to which it belongs. .

[0094] (7) Statistical analysis of the gearbox's G-load spectrum operating conditions in gear. runtime .

[0095] (8) Based on the operating time of the power source in the PCU ,statistics G-mode load spectrum operating points within the time range Running time within 100 hours .

[0096] (9) When the control signal sent by the TCU confirms that the gearbox has started to shift gears, it is considered that the operation of G gear has ended.

[0097] (10) After the G gear operation is completed, according to the formula Determine the gearbox gear G at the load spectrum operating point Total runtime.

[0098] (11) Total running time and running time within 100 hours Stored in the non-volatile ferroelectric memory area of ​​the TCU.

[0099] (12) According to the formula The content of metal particles in the transmission fluid generated during operation of the transmission in G mode across all load spectrum conditions was calculated. This is an assessment value for the content of metal particles in the oil produced when the transmission is in G gear. G gear of the transmission at the operating point The change in the content of metal particles in the transmission fluid after running for H hours was obtained from experimental testing.

[0100] (13) According to the formula The total metal particulate matter content in the transmission fluid caused by the operation of each gear was calculated and assessed. It is the highest gear in the transmission.

[0101] (14) According to the formula The calculated evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated after 100 hours of operation in G mode across all load spectrum conditions was obtained. The growth rate of metal particulate matter content in the oil generated during transmission operation in G mode over 100 hours is evaluated.

[0102] (15) According to the formula The total growth rate of metal particulate matter in the transmission fluid caused by operation in each gear over 100 hours was calculated and evaluated.

[0103] (16) According to the formula The remaining life assessment value of the transmission fluid was calculated, where This is the estimated remaining life value for the transmission fluid. The maximum value of metal particulate matter content in the transmission fluid that ensures the reliability of the transmission is not affected was obtained through experimental testing.

[0104] (17) According to the formula The power source operating time when the transmission fluid needs to be changed is calculated.

[0105] The above system and method can be used to calculate and determine the transmission fluid replacement cycle, assess the remaining service life of the transmission fluid based on the operating load, and accurately assess the timing of the fluid change. This avoids using fluid with parameters exceeding the standard or wasting the service life of the fluid, thereby reducing transmission maintenance costs while ensuring reliable operation.

[0106] Example 3, based on the same inventive concept as other examples, introduces a transmission oil change cycle assessment device based on operating load, comprising:

[0107] The acquisition module is used to acquire the operating load spectrum of each gear of the transmission;

[0108] The content calculation module is used to calculate the total running time of any gear at each operating point in the operating load spectrum based on the collected transmission input speed and transmission input torque corresponding to any gear of the transmission; based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the module calculates the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points.

[0109] The first evaluation value calculation module is used to calculate the evaluation value of the total metal particulate matter content in the transmission fluid caused by the operation of each gear based on the calculated metal particulate matter content of each gear.

[0110] The second evaluation value calculation module is used to obtain the pre-calculated evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated by running the fixed time at all load spectrum working points in any gear.

[0111] The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value.

[0112] The replacement time determination module is used to determine the remaining life assessment value of the transmission fluid based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particle content, and to determine the power source operating time when the transmission fluid needs to be replaced based on the assessment value of the remaining life of the transmission fluid.

[0113] Example 4, based on the same inventive concept as other examples, describes a computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform the method of the first aspect.

[0114] Example 5, based on the same inventive concept as other examples, describes a computer device including one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for performing the method described in the first aspect.

[0115] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0116] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0117] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0118] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0119] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for evaluating transmission oil change intervals based on operating load, characterized in that, include: Obtain the operating load spectrum for each gear of the transmission; Based on the collected transmission input speed and transmission input torque corresponding to any gear of the transmission, calculate the total running time of any gear at each working point in the operating load spectrum. Based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points is calculated. The total metal particulate matter content in the transmission fluid caused by the operation of each gear is calculated based on the calculated metal particulate matter content of each gear. Obtain the pre-calculated growth rate assessment value of the metal particulate matter content in the transmission fluid generated during the fixed time of operation at all load spectrum conditions in any given gear. The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value. The remaining life assessment value of the transmission fluid is determined based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particles. Based on the remaining life assessment value of the transmission fluid, the power source operating time when the transmission fluid needs to be replaced is determined.

2. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The acquisition of the operating load spectrum for each gear of the transmission includes: For any gear in the transmission, the operating range of the transmission's input speed is divided into fixed intervals. The transmission input torque operating range is divided into several intervals. Each interval forms a region with * Operating load spectrum at each working point, using This represents the various operating conditions of each operating load spectrum, where 1 ≤ ≤ ,1≤ ≤ .

3. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The acquisition of the transmission input torque includes: If the transmission's drive source is a drive motor, the actual torque of the drive motor is read and used as the transmission's input torque. ; If the transmission is driven by an engine and is not equipped with a torque converter, read the actual torque percentage of the engine. Through formula Calculate the actual engine torque ,in, The maximum torque value of the engine, the actual torque of the engine As the input torque of the transmission ; If the transmission's drive source is an engine and it is equipped with a torque converter, the pump impeller speed of the torque converter is the same as the engine speed. The pump impeller speed is determined based on the engine speed signal. The turbine speed of the hydraulic torque converter is determined by a speed sensor. According to the formula Turbine torque was calculated ,in, The torque ratio of the hydraulic torque converter. The torque coefficient is the torque coefficient when the pump impeller speed is 1000 rpm, and the turbine torque is... As the input torque of the transmission .

4. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The calculation of the total running time of any gear at each operating point in the operating load spectrum includes: Collect the transmission input speed corresponding to gear G. and transmission input torque According to the input speed of the gearbox and transmission input torque Confirm the operating point in the load spectrum of gear G. ; Statistics on the first running time The first running time The operating point of the transmission in gear G. runtime; Adding the first running time after each transmission fluid change The gear G is obtained at the operating point. Total runtime .

5. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The process of obtaining the evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated by running the specified fixed time at all load spectrum operating points in any given gear includes: Statistics on the second running time The second running time for Gear G at the operating point within the time range runtime in For the operating time of the power source; Based on the second running time and the change in the content of metal particles Calculate the growth rate assessment value of the metal particulate matter content in the transmission fluid generated by gear G operating for a fixed time N at all load spectrum conditions. .

6. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The formula for calculating the remaining life assessment value of the transmission fluid is as follows: ； In the formula, This is the estimated remaining life value for the transmission fluid. To ensure that the reliability of the transmission is not affected, the maximum value of metal particulate matter content in the transmission fluid is required. This is an assessment value for the total content of metal particles in the transmission fluid caused by the operation of each gear in the transmission. The total growth rate of metal particulate matter content in transmission fluid is the assessed value, where N is a fixed time.

7. The method for evaluating transmission oil change intervals based on operating load according to claim 1, characterized in that, The formula for calculating the power source operating time when the transmission fluid needs to be changed is as follows: ； In the formula, This refers to the operating time of the power source when the transmission fluid needs to be changed. For the operating time of the power source, This is the estimated remaining life value for the transmission fluid.

8. A transmission oil change interval assessment device based on operating load, comprising: The acquisition module is used to acquire the operating load spectrum of each gear of the transmission; The content calculation module is used to calculate the total running time of any gear at each working point in the operating load spectrum based on the collected gear input speed and gear input torque of any gear in the gearbox. Based on the total running time of any gear at each operating point in the operating load spectrum and the change in the metal particulate matter content in the transmission fluid after the target running time of any gear at each operating point obtained through pre-testing, the metal particulate matter content in the transmission fluid generated by the operation of any gear at all operating points is calculated. The first evaluation value calculation module is used to calculate the evaluation value of the total metal particulate matter content in the transmission fluid caused by the operation of each gear based on the calculated metal particulate matter content of each gear. The second evaluation value calculation module is used to obtain the pre-calculated evaluation value of the growth rate of metal particulate matter content in the transmission fluid generated by running the fixed time at all load spectrum working points in any gear. The total growth rate assessment value of the metal particulate matter content in the transmission fluid caused by the operation of each gear within the fixed time period is calculated based on the growth rate assessment value. The replacement time determination module is used to determine the remaining life assessment value of the transmission fluid based on the assessment value of the total content of the metal particles and the assessment value of the total growth rate of the metal particle content, and to determine the power source operating time when the transmission fluid needs to be replaced based on the assessment value of the remaining life of the transmission fluid.

9. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1 to 7.

10. A computer device, characterized in that, include, One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing the method of any of claims 1 to 7.

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