Heating system for gear transmissions in vehicles

Abstract

This application discloses a heating system for a gear transmission device in a vehicle, relating to the field of vehicle technology. The heating system includes a vehicle controller, an oil pump controller, a temperature sensor, and a heating wire. The oil pump controller controls the oil pump to deliver lubricating oil to the gear transmission device via a lubrication channel. The temperature sensor is mounted on the housing of the gear transmission device and is located below the lubricating oil level. The heating wire is located within the lubrication channel. The temperature sensor is used to acquire the lubricating oil temperature. The vehicle controller determines the current information corresponding to the lubricating oil temperature when the lubricating oil temperature is below a threshold temperature. The oil pump controller energizes the heating wire based on the current information, ensuring that the oil temperature after energizing the heating wire is greater than or equal to the threshold temperature. This application, by energizing the heating wire, promptly reduces the impact of excessively low lubricating oil temperature on the gear transmission device, thereby improving the transmission efficiency of the gear transmission device.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a heating system for a gear transmission device used in a vehicle. Background Technology

[0002] For automotive transmissions or reducers, the design of lubrication schemes for gear transmission devices is particularly important in order to ensure their transmission efficiency, performance, and reliability.

[0003] Among related technologies, liquid lubrication is the most effective solution for reducing frictional losses in gear transmission mechanisms, with various types of lubricating oils being the preferred lubricating medium. Currently, traditional gear transmission lubrication methods are primarily splash lubrication and active lubrication. However, the temperature characteristics of the lubricating oil in these methods can affect the lubrication and operation of the gears. Generally, lower temperatures result in poorer lubricating oil flow and higher kinematic viscosity, leading to lower transmission efficiency in the gear transmission. Furthermore, because lubricating oil flows poorly at low temperatures, it cannot effectively guarantee the lubrication of bearings and gears in the transmission, potentially causing bearing and gear burn-out under extreme conditions of slippage at the wheel ends. Commonly used mitigation methods include idling the vehicle after starting to warm it up or driving at low speed for a period of time.

[0004] However, the above-mentioned avoidance measures cannot effectively compensate for the impact of the temperature characteristics of the lubricating oil, and will still affect the transmission efficiency of the gear transmission device. Summary of the Invention

[0005] This application provides a heating system for a gear transmission device in a vehicle. The technical solution provided by this application is as follows:

[0006] According to one aspect of the present application, a heating system for a gear transmission device in a vehicle is provided. The heating system includes a vehicle controller, an oil pump controller, a temperature sensor, and a heating wire. The oil pump controller controls the oil pump to deliver lubricating oil to the gear transmission device via a lubrication passage. The temperature sensor is mounted on the housing of the gear transmission device and is located below the level of the lubricating oil. The heating wire is located inside the lubrication passage. The vehicle controller is connected to the oil pump controller and the temperature sensor via signal lines.

[0007] The temperature sensor is used to obtain the oil temperature of the lubricating oil;

[0008] The vehicle controller is used to determine the current information corresponding to the oil temperature of the lubricating oil when the oil temperature is lower than the oil temperature threshold.

[0009] The oil pump controller is used to energize the heating wire according to the current information, so that the oil temperature after the heating wire is energized is greater than or equal to the oil temperature threshold.

[0010] The technical solution provided in this application can bring the following beneficial effects:

[0011] By energizing a heating wire when the lubricating oil temperature is below a threshold temperature, the lubricating oil temperature can be raised to above or equal to the threshold temperature in a short time. Compared to related technologies that involve idling or driving at low speed for a period of time to warm up the engine, this heating method can promptly reduce the impact of excessively low lubricating oil temperature on the gear transmission device, improve the transmission efficiency of the gear transmission device, and thus improve the overall vehicle performance. Furthermore, the heating method of raising the lubricating oil temperature by energizing the heating wire based on current information is highly feasible and easy for technicians to implement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a heating system for a gear transmission device applied to a vehicle, according to one embodiment of this application;

[0013] Figure 2 This is a flowchart of a lubrication scheme for a gear transmission device provided in one embodiment of this application;

[0014] Figure 3 This is an overall flowchart of the heating and lubrication schemes for a gear transmission device provided in one embodiment of this application;

[0015] Figure 4 This is a flowchart of a heating method based on a heating system provided in one embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0017] Please refer to Figure 1 This document illustrates a schematic diagram of a heating system for a gear transmission device in a vehicle, according to an embodiment of this application. The heating system includes an oil pump control system 1, a heating wire 2, a lubricating oil passage 3, a vehicle controller 4, and a temperature sensor 6. The oil pump control system 1 includes an oil pump 1.1 and an oil pump controller 1.2. The oil pump controller 1.2 controls the oil pump 1.1 to deliver lubricating oil to the gear transmission device via the lubricating oil passage 3. The temperature sensor 6 is mounted on the housing of the gear transmission device and is located below the lubricating oil level. The heating wire 2 is located within the lubricating oil passage 3. The vehicle controller 4 is connected to the oil pump controller 1.2 and the temperature sensor 6 via signal lines 5.

[0018] A gear transmission is a mechanical device on a vehicle that relies on the driving force of gears to operate. For example, a gear transmission can be a gearbox or a reducer. Gear transmissions require lubricating oil to achieve gear transmission.

[0019] The oil pump control system 1 is an integrated control system combining oil pump 1.1 and oil pump controller 1.2. The oil pump needs to receive control commands from the oil pump controller and achieve oil lubrication by adjusting the pump speed. The oil pump must have good adjustability and controllability, NVH (Noise, Vibration, Harshness) performance, and low voltage power consumption. The oil pump controller needs to receive control signals from the vehicle controller and make corresponding feedback based on its judgment logic, controlling the oil pump to deliver lubricating oil to the gear transmission device through the lubrication oil passage. Furthermore, the oil pump controller can feed back relevant control information from the oil pump controller to the vehicle controller.

[0020] The heating wire 2 is a current-carrying conductor that converts electrical energy into heat energy by utilizing the ohmic property. The heating wire has good chemical corrosion resistance and high temperature stability. Since the heating wire is located in the lubricating oil passage, its chemical corrosion resistance is especially effective against various chemical corrosions of lubricating oil.

[0021] Lubricating oil passage 3, broadly speaking, refers to the flow channels or pipelines added within a gear transmission device for the flow of lubricating oil. The lubricating oil passage needs to maintain a certain level of cleanliness, ensuring no significant change in cleanliness throughout the design life of the gear transmission device. It also needs to incorporate a particulate filter, which can be divided into coarse and fine filters, ensuring no significant performance degradation throughout the design life of the gear transmission device. Furthermore, the lubricating oil passage should have some integration potential, allowing for the integration of heating wires within it.

[0022] The Vehicle Control Unit (VCU) is a collective term for all controllers in the vehicle that interact with the fuel pump and fuel pump controller. It is the core control device of the vehicle, responsible for controlling critical vehicle tasks. The VCU receives driver input signals by collecting signals from the accelerator pedal, brake pedal, and gear position, and transmits these signals to the fuel pump and fuel pump controller. It then completes the information processing loop by analyzing relevant control information fed back from the fuel pump controller. The VCU is connected to the fuel pump controller and temperature sensor via signal lines, enabling information sharing between the fuel pump controller and the VCU, as well as between the temperature sensor and the VCU. Additionally, the VCU can also acquire information such as vehicle speed, power demand, and engine torque from other vehicle modules via signal lines.

[0023] Signal line 5 is a signal transmission line in a broad sense, and must have considerable signal transmission stability and anti-interference capability. For example, the signal line can be a CAN (Controller Area Network) bus.

[0024] Temperature sensor 6 is a generalized thermistor-driven temperature sensor, which needs to have a certain degree of temperature measurement accuracy. The temperature sensor is usually mounted on the housing of the gear transmission device, and the probe of the temperature sensor is immersed below the level of the lubricating oil in the gear transmission device.

[0025] Optionally, the vehicle can also be equipped with a slope sensor to obtain the slope of the road conditions. When the slope sensor detects that the road slope is too high, causing the oil pump to be unable to draw enough lubricating oil to deliver to the gear transmission, the oil transfer rate will be increased to ensure that the oil pump draws enough lubricating oil, thereby avoiding affecting the operation of the gear transmission.

[0026] In addition, the oil pump and oil pump controller, heating wire, lubricating oil passage, and temperature sensor are connected via voltage harnesses or assembly relationships, while the vehicle controller and oil pump control system are connected and interact via signal lines.

[0027] The following section introduces a heating solution for gear transmission devices used in vehicles.

[0028] In some embodiments, a temperature sensor is used to acquire the temperature of the lubricating oil. The lubricating oil temperature includes one of the following: the average oil temperature of the lubricating oil over a first time period, or the real-time oil temperature of the lubricating oil.

[0029] The temperature sensor acquires the oil temperature of the lubricating oil at a first frequency, that is, the temperature sensor acquires an oil temperature value every time period corresponding to the first frequency.

[0030] Optionally, if the lubricating oil temperature refers to the average lubricating oil temperature within a first time period, the temperature sensor acquires at least one oil temperature value within the first time period prior to the current moment, and averages these at least one oil temperature value to obtain the lubricating oil temperature. The length of the first time period is not limited in this application and can be set by a technician according to the vehicle's heating requirements. For example, the lubricating oil temperature may refer to the average lubricating oil temperature over 5 seconds.

[0031] Optionally, if the lubricating oil temperature refers to the real-time lubricating oil temperature, the temperature sensor obtains the most recently acquired oil temperature value before the current moment as the lubricating oil temperature.

[0032] In some embodiments, the vehicle controller is used to acquire vehicle scheduled start information, which includes the vehicle's scheduled wake-up time; the temperature sensor is used to acquire the lubricating oil temperature at a first time point before the scheduled wake-up time.

[0033] The vehicle controller is used to confirm the vehicle's scheduled start status and obtain the scheduled start information. This information indicates the owner's driving intentions, including their preferred driving time and conditions. Therefore, the scheduled start information includes the vehicle's scheduled wake-up time. The scheduled wake-up time is a user-defined time by the owner. When the scheduled wake-up time is reached, the vehicle will start automatically without manual intervention.

[0034] After the vehicle owner sets the vehicle's scheduled start information, the temperature sensor acquires the lubricating oil temperature at the first point in time before the scheduled wake-up time. This application does not limit the specific time point before the scheduled wake-up time; it can be set by technicians according to the vehicle's heating needs. For example, the first point in time before the scheduled wake-up time could be 10 minutes prior to the scheduled wake-up time.

[0035] In some embodiments, the vehicle controller is used to determine the current information corresponding to the lubricating oil temperature when the lubricating oil temperature is lower than the oil temperature threshold.

[0036] In some embodiments, the oil temperature threshold refers to the temperature value at which the kinematic viscosity gradient of the lubricating oil is greater than the gradient threshold, and the kinematic viscosity is used to indicate the resistance encountered by the lubricating oil during flow.

[0037] There is a mapping relationship between the temperature and kinematic viscosity of lubricating oil. The kinematic viscosity gradient refers to the rate of change of kinematic viscosity with temperature. As the temperature of the lubricating oil decreases, its kinematic viscosity increases accordingly, and the kinematic viscosity gradient also increases with decreasing temperature. When the kinematic viscosity gradient of the lubricating oil rises above a gradient threshold, the corresponding temperature value of the lubricating oil is the oil temperature threshold. This application does not limit the gradient threshold; it can be set by technicians according to the vehicle's heating requirements. Typically, the oil temperature threshold is less than or equal to -10℃.

[0038] The temperature sensor transmits the lubricating oil temperature to the vehicle controller via a signal line. Upon receiving the lubricating oil temperature data, the vehicle controller determines its relationship to a threshold temperature. If the lubricating oil temperature is below the threshold, the vehicle controller determines the corresponding current information, which is used to indicate the required current for the heating element.

[0039] In some embodiments, the vehicle controller is used to determine the kinematic viscosity of the lubricating oil at the lubricating oil temperature based on the lubricating oil temperature using a viscosity coefficient model, wherein the viscosity coefficient model is formulated based on the mapping relationship between oil temperature and kinematic viscosity; and to determine the current information corresponding to the lubricating oil temperature based on the mapping relationship between kinematic viscosity and current information.

[0040] The viscosity coefficient model is a model based on the mapping relationship between different oil temperatures and kinematic viscosity. By using the viscosity coefficient model, the kinematic viscosity of the lubricating oil at the corresponding oil temperature can be determined.

[0041] The mapping relationship between kinematic viscosity and current information is a pre-simulated current information required for different kinematic viscosities of lubricating oil. The current information required for kinematic viscosity is used to ensure that the oil temperature of the lubricating oil after energization is greater than or equal to the oil temperature threshold. Based on the mapping relationship between kinematic viscosity and current information, the current information corresponding to the kinematic viscosity of the lubricating oil is determined, that is, the kinematic viscosity corresponding to the oil temperature is determined.

[0042] In some embodiments, the vehicle controller is used to determine the current information corresponding to the oil temperature of the lubricating oil based on the oil temperature using a current coefficient model.

[0043] The current coefficient model is a model developed based on the mapping relationship between different oil temperatures and current information. Using the current coefficient model, the current information corresponding to the lubricating oil temperature can be directly determined. Specifically, the mapping relationship between oil temperature and current information is a pre-simulated current information corresponding to different lubricating oil temperatures. This required current information is used to ensure that the lubricating oil temperature after energization is greater than or equal to the oil temperature threshold.

[0044] In some embodiments, the oil pump controller is used to energize the heating wire according to the current information so that the oil temperature after the heating wire is energized is greater than or equal to the oil temperature threshold.

[0045] After determining the current information corresponding to the lubricating oil temperature, the vehicle controller sends this information to the oil pump controller via a signal line. The oil pump controller then energizes the heating element based on this current information, raising the lubricating oil temperature to a level greater than or equal to the oil temperature threshold. The oil temperature after the heating element is energized refers to the lubricating oil temperature at that point.

[0046] In some embodiments, the vehicle controller is used to determine the heating model corresponding to the lubricating oil temperature based on the temperature range of the lubricating oil temperature, with different temperature ranges corresponding to different heating models; the oil pump controller is used to energize the heating wire according to the current information through the heating model.

[0047] The heating model is based on the ohmic characteristics of the heating wire and uses current information to bring the lubricating oil, whose temperature is below the threshold, to the threshold temperature. Different temperature ranges correspond to different heating models. The smaller the temperature range, the greater the current information provided by the corresponding heating model; conversely, the larger the temperature range, the smaller the current information provided by the corresponding heating model.

[0048] This application does not limit the temperature range, which can be set by technicians according to the vehicle's heating requirements. For example, the temperature range can be divided into a temperature range ≤-35℃, a temperature range of -35℃ to -25℃, and a temperature range ≥-25℃. The temperature range ≤-35℃ corresponds to a heating model with higher current information, the temperature range of -35℃ to -25℃ corresponds to a heating model with moderate current information, and the temperature range ≥-25℃ corresponds to a heating model with lower current information.

[0049] The vehicle controller selects the heating model corresponding to the lubricating oil temperature based on the temperature range of the lubricating oil. The vehicle controller sends the heating model information to the oil pump controller. The oil pump controller uses the heating model and current information to energize the heating wire so that the oil temperature after the heating wire is energized is greater than or equal to the oil temperature threshold.

[0050] The technical solution provided in this application raises the lubricating oil temperature to above or equal to the threshold temperature within a short time by energizing a heating wire when the lubricating oil temperature is below the threshold temperature. Compared to related technologies that involve idling or driving at low speed for a period of time to warm up the engine, this heating solution can promptly reduce the impact of excessively low lubricating oil temperature on the gear transmission device, improve the transmission efficiency of the gear transmission device, and thus improve the overall vehicle performance. Furthermore, the heating solution that raises the lubricating oil temperature by energizing the heating wire based on current information is highly feasible and easy for technicians to implement.

[0051] The following section introduces lubrication solutions for gear transmission devices used in vehicles.

[0052] In some embodiments, the vehicle controller is configured to acquire the opening degree of the accelerator pedal when the lubricating oil temperature is greater than or equal to an oil temperature threshold; control the oil pump to run at the minimum pumping speed for a first time length when the accelerator pedal opening degree is 0; and control the oil pump to stop running when the number of times the oil pump runs at the minimum pumping speed is greater than or equal to a number threshold.

[0053] After obtaining the lubricating oil temperature, the vehicle controller determines the relationship between the lubricating oil temperature and the oil temperature threshold. If the lubricating oil temperature is lower than the oil temperature threshold, the vehicle controller executes the heating scheme applied to the vehicle's gear transmission device. If the lubricating oil temperature is greater than or equal to the oil temperature threshold, the vehicle controller executes the lubrication scheme applied to the vehicle's gear transmission device.

[0054] The accelerator pedal opening indicates the degree to which the accelerator pedal is depressed. Specifically, it refers to the ratio of the vertical distance between the accelerator pedal and the bottom of the vehicle when depressed to the vertical distance when the accelerator pedal is not depressed. When the driver starts the vehicle and depresses the accelerator pedal, the vehicle controller obtains the accelerator pedal opening.

[0055] With the accelerator pedal open to 0, the vehicle controller controls the oil pump to operate at its minimum pumping speed for a first time period. The oil pumping speed refers to the rotational speed of the oil pump motor during operation. This speed directly affects the oil pressure and injection quantity, thus influencing engine power output and vehicle performance. When the pumping speed is too low, it leads to reduced oil pressure and injection quantity, causing the engine to barely operate at idle. The minimum pumping speed is related to the performance of the oil pump motor; different oil pumps may correspond to different minimum pumping speeds, which are not limited in this application. The first time period is a preset time period by a technician and is not limited in this application.

[0056] After the vehicle controller controls the oil pump to run at its minimum pumping speed for a first time period, it then acquires the accelerator pedal opening. If the accelerator pedal opening is still 0, the vehicle controller again controls the oil pump to run at its minimum pumping speed for the first time period. If the number of times the oil pump runs at its minimum pumping speed is greater than or equal to a threshold number, the oil pump is controlled to stop running, meaning it no longer supplies lubricating oil to the gear transmission. This application does not limit the number of times the oil pump runs at its minimum pumping speed; it can be set by a technician according to the vehicle's lubrication requirements. For example, the threshold number could be 2 times, meaning that if the number of times the oil pump runs at its minimum pumping speed is greater than or equal to 2 times, the oil pump is controlled to stop running.

[0057] By controlling the oil pump to operate at its minimum pumping speed when the pedal opening is 0, the gear transmission device in the vehicle is lubricated, making vehicle starting more convenient and improving vehicle starting efficiency. Furthermore, if the number of times the oil pump operates at its minimum pumping speed is greater than or equal to a threshold, the oil pump is controlled to stop operating, avoiding excessive lubrication cycles and thus saving lubricating oil to a certain extent.

[0058] In some embodiments, the vehicle controller is used to obtain the vehicle speed when the accelerator pedal opening is greater than 0; when the vehicle speed is greater than or equal to a vehicle speed threshold, determine the pump speed corresponding to the vehicle speed, wherein the pump speed is positively correlated with the vehicle speed; and control the oil pump to operate at the pump speed corresponding to the vehicle speed.

[0059] Vehicle speed is determined by the accelerator pedal opening; the smaller the accelerator pedal opening, the higher the vehicle speed. When the vehicle speed is greater than or equal to a speed threshold, the corresponding pump speed is determined based on the linear mapping relationship between vehicle speed and pump speed, and the pump is controlled to operate at the corresponding pump speed. The pump speed and vehicle speed have a positive linear correlation: the higher the vehicle speed, the higher the pump speed; the lower the vehicle speed, the lower the pump speed.

[0060] In some embodiments, the vehicle speed threshold is a vehicle speed value determined based on the highest rotational speed of the gear transmission during splash lubrication operation. The vehicle speed threshold is related to the performance of the gear transmission, and different gear transmissions correspond to different vehicle speed thresholds, which are not limited in this application. Typically, the vehicle speed threshold is greater than or equal to 5 km / h.

[0061] By controlling the oil pump to operate at the corresponding pumping speed according to the vehicle speed when the accelerator pedal opening is greater than 0, the gear transmission device can be properly lubricated. This avoids the vehicle's power decreasing due to excessively low pumping speed when the vehicle is traveling at high speed, which would affect the normal operation of the vehicle. This effectively ensures the transmission efficiency of the gear transmission device and the vehicle's driving condition.

[0062] In some embodiments, the vehicle controller is used to control the oil pump to operate at the minimum pumping speed when the vehicle speed is less than a vehicle speed threshold.

[0063] This means that when the vehicle speed is less than the vehicle speed threshold, the vehicle controller controls the oil pump to deliver lubricating oil to the gear transmission device at the minimum pumping speed of the oil pump, so as to achieve lubrication of the gear transmission device.

[0064] By controlling the oil pump to operate at its minimum pumping speed when the vehicle speed is below the vehicle speed threshold, the system avoids excessive pumping speed at low vehicle speeds, which would cause the lubricating oil to generate high pressure and temperature, resulting in excessive heat that could damage the oil pump and lubrication channels. This effectively ensures the normal operation of the oil pump.

[0065] Figure 2The flowchart illustrates the lubrication scheme for the gear transmission device. The vehicle controller first performs anti-theft authentication, which involves sensing whether a mechanical key, electronic key, or other unlocking tool is inside or near the vehicle. If the anti-theft authentication fails, the vehicle's safe driving condition is also failed, and the vehicle cannot be started. If the anti-theft authentication succeeds, the vehicle's starting status is checked. If the vehicle is not started, it indicates that there is no need to drive, and the scheme execution process ends. If the vehicle is already started, the vehicle controller obtains the lubricating oil temperature. If the lubricating oil temperature is below a threshold temperature, the active heating mode is activated, i.e., the heating element is energized to ensure that the lubricating oil temperature after the heating element is energized is greater than or equal to the threshold temperature.

[0066] When the lubricating oil temperature is greater than or equal to a threshold temperature, the accelerator pedal opening is acquired. If the accelerator pedal opening is 0, the oil pump motor is controlled to run at its base speed for a first time period, i.e., the oil pump runs at its minimum pumping speed for a first time duration. When the accelerator pedal opening is 0, after the number of times the oil pump runs at its minimum pumping speed reaches a threshold, the oil pump stops running. When the accelerator pedal opening is greater than 0, the vehicle speed information is acquired. If the vehicle speed is greater than or equal to a speed threshold, the oil pump speed is linearly adjusted based on the vehicle speed information, i.e., a linearly positively correlated pumping speed is determined based on the vehicle speed, and the oil pump is controlled to run at the pumping speed corresponding to the vehicle speed. This allows the oil pump to decompose the target speed of the corresponding oil pump motor based on the target speed of the drive system forwarded by the vehicle controller. If the vehicle speed is less than the speed threshold, the oil pump motor is controlled to run at its base speed, i.e., the oil pump runs at its minimum pumping speed.

[0067] Figure 3 The diagram illustrates the overall flowchart of the heating and lubrication schemes for the gear transmission device. The vehicle controller first confirms the vehicle's scheduled start status and acquires the scheduled start information. Based on this information, it determines the scheduled wake-up time and acquires the lubricating oil temperature at the first point before the scheduled wake-up time. It then determines the relationship between the lubricating oil temperature and a temperature threshold. If the oil temperature is below the threshold, it invokes a viscosity coefficient model to determine the kinematic viscosity of the lubricating oil at that temperature. Based on this kinematic viscosity, it determines the corresponding current information. The heating model is then determined based on the temperature range of the lubricating oil. Different temperature ranges correspond to different heating models. Finally, using the selected heating model, the heating wire is energized according to the current information to ensure that the lubricating oil temperature after energization is greater than or equal to the temperature threshold.

[0068] If the vehicle controller does not receive the vehicle's scheduled start information, the vehicle undergoes anti-theft authentication. If the authentication is successful, the vehicle's start status is checked. If the vehicle is already started, the vehicle controller obtains the lubricating oil temperature and determines its relationship with a threshold temperature. If the lubricating oil temperature is below the threshold, the heating scheme described above is executed; if the lubricating oil temperature is above the threshold, the lubrication scheme is executed. When the lubricating oil temperature is greater than or equal to the threshold, the accelerator pedal opening is obtained. If the accelerator pedal opening is 0, the oil pump motor is controlled to run at base speed for a first time period. When the accelerator pedal opening is greater than 0, the vehicle speed information is obtained. If the vehicle speed is greater than or equal to a speed threshold, the oil pump speed is linearly adjusted according to the speed information. If the vehicle speed is less than the threshold, the oil pump motor is controlled to run at base speed. For detailed lubrication procedures, please refer to [reference needed]. Figure 2 The flowchart shown.

[0069] Figure 2 , Figure 3 The dashed lines in the diagram represent phased strategies, typically defined as processes that stop running after a specified time and number of runs.

[0070] The following are embodiments of the method of this application. For details not described in the embodiments of the method of this application, please refer to the embodiments of the heating system above.

[0071] Please refer to Figure 4 The diagram illustrates a flowchart of a heating method based on a heating system according to an embodiment of this application. The method is applied to the heating system described above for a gear transmission device in a vehicle. This heating system includes a vehicle controller, an oil pump controller, a temperature sensor, and a heating wire. The oil pump controller controls the oil pump to deliver lubricating oil to the gear transmission device via a lubrication passage. The temperature sensor is mounted on the housing of the gear transmission device and is located below the lubricating oil level. The heating wire is located within the lubrication passage. The vehicle controller is connected to the oil pump controller and the temperature sensor via signal lines.

[0072] The method may include at least one of the following steps 410 to 430.

[0073] Step 410: The temperature sensor obtains the oil temperature of the lubricating oil.

[0074] In some embodiments, the lubricating oil temperature includes one of the following: the average lubricating oil temperature during a first time period, or the real-time lubricating oil temperature.

[0075] In some embodiments, the vehicle controller acquires the vehicle's scheduled start information, which includes the vehicle's scheduled wake-up time; the temperature sensor acquires the lubricating oil temperature at a first time point before the scheduled wake-up time.

[0076] Step 420: When the lubricating oil temperature is lower than the oil temperature threshold, the vehicle controller determines the current information corresponding to the lubricating oil temperature.

[0077] In some embodiments, the oil temperature threshold refers to the temperature value at which the kinematic viscosity gradient of the lubricating oil is greater than the gradient threshold, and the kinematic viscosity is used to indicate the resistance encountered by the lubricating oil during flow.

[0078] In some embodiments, the vehicle controller determines the kinematic viscosity of the lubricating oil at the lubricating oil temperature based on the lubricating oil temperature using a viscosity coefficient model, which is based on the mapping relationship between oil temperature and kinematic viscosity; and determines the current information corresponding to the lubricating oil temperature based on the mapping relationship between kinematic viscosity and current information.

[0079] Step 430: The oil pump controller energizes the heating wire according to the current information so that the oil temperature after the heating wire is energized is greater than or equal to the oil temperature threshold.

[0080] In some embodiments, the vehicle controller determines the heating model corresponding to the lubricating oil temperature based on the temperature range of the lubricating oil temperature, with different temperature ranges corresponding to different heating models; the oil pump controller energizes the heating wire according to the current information based on the heating model.

[0081] In some embodiments, the vehicle controller acquires the opening degree of the vehicle's accelerator pedal when the lubricating oil temperature is greater than or equal to an oil temperature threshold; when the accelerator pedal opening degree is 0, it controls the oil pump to run at the minimum pumping speed for a first time length; and when the number of times the oil pump runs at the minimum pumping speed is greater than or equal to a number threshold, it controls the oil pump to stop running.

[0082] In some embodiments, the vehicle controller acquires the vehicle speed when the accelerator pedal opening is greater than 0; when the vehicle speed is greater than or equal to a vehicle speed threshold, it determines the pump speed corresponding to the vehicle speed, and the pump speed is positively correlated with the vehicle speed; and controls the oil pump to operate at the pump speed corresponding to the vehicle speed.

[0083] In some embodiments, the vehicle speed threshold is a vehicle speed value determined based on the highest rotational speed of the gear transmission during splash lubrication operation.

[0084] In some embodiments, when the vehicle speed is less than a vehicle speed threshold, the vehicle controller controls the oil pump to operate at the minimum pumping speed of the oil pump.

[0085] The technical solution provided in this application, by energizing a heating wire when the lubricating oil temperature is below a threshold temperature, allows the lubricating oil temperature to rise to above or equal to the threshold temperature in a short time. This effectively reduces the impact of excessively low lubricating oil temperature on the gear transmission device, improves the transmission efficiency of the gear transmission device, and thus enhances the overall vehicle performance. Furthermore, the heating scheme, which raises the lubricating oil temperature by energizing the heating wire based on current information, is highly feasible and easy for technicians to implement.

[0086] It should be understood that "multiple" as used herein refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the step numbers described herein are merely illustrative of one possible execution order. In some other embodiments, the steps may not be executed in numerical order, such as two steps with different numbers being executed simultaneously, or two steps with different numbers being executed in the reverse order of the illustration. This application does not limit this.

[0087] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heating system for a gear transmission device in a vehicle, characterized in that, The heating system includes a vehicle controller, an oil pump controller, a temperature sensor, and a heating wire. The oil pump controller controls the oil pump to deliver lubricating oil to the gear transmission device via a lubricating oil passage. The temperature sensor is mounted on the housing of the gear transmission device and is located below the lubricating oil level. The heating wire is located inside the lubricating oil passage. The vehicle controller is connected to the oil pump controller and the temperature sensor via signal lines. The vehicle controller is used to obtain the vehicle's scheduled start information, which includes the vehicle's scheduled wake-up time. The temperature sensor is used to obtain the oil temperature of the lubricating oil at a first time point before the scheduled wake-up time; The vehicle controller is used to determine the kinematic viscosity of the lubricating oil corresponding to the oil temperature by using a viscosity coefficient model based on the oil temperature when the oil temperature is lower than the oil temperature threshold. The viscosity coefficient model is formulated based on the mapping relationship between the oil temperature and the kinematic viscosity. The controller also determines the current information corresponding to the oil temperature based on the mapping relationship between the kinematic viscosity and current information. The oil pump controller is used to energize the heating wire according to the current information, so that the oil temperature after the heating wire is energized is greater than or equal to the oil temperature threshold.

2. The heating system according to claim 1, characterized in that, The oil temperature threshold refers to the temperature value when the kinematic viscosity gradient of the lubricating oil is greater than the gradient threshold. The kinematic viscosity is used to indicate the resistance encountered by the lubricating oil during flow.

3. The heating system according to claim 1, characterized in that, The oil temperature of the lubricating oil includes one of the following: The average oil temperature of the lubricating oil during the first time period; The real-time oil temperature of the lubricating oil.

4. The heating system according to claim 1, characterized in that, The vehicle controller is used to determine the heating model corresponding to the temperature of the lubricating oil based on the temperature range of the lubricating oil temperature. Different temperature ranges correspond to different heating models. The oil pump controller is used to energize the heating wire according to the current information through the heating model.

5. The heating system according to claim 1, characterized in that, The vehicle controller is used for: When the temperature of the lubricating oil is greater than or equal to the oil temperature threshold, the opening of the accelerator pedal of the vehicle is obtained. When the accelerator pedal opening is 0, the oil pump is controlled to run at the minimum pumping speed of the oil pump for a first time length. If the number of times the oil pump operates at its minimum pumping speed is greater than or equal to a threshold number, the oil pump is controlled to stop operating.

6. The heating system according to claim 5, characterized in that, The vehicle controller is also used for: When the accelerator pedal opening is greater than 0, the vehicle speed is obtained; When the vehicle speed is greater than or equal to a vehicle speed threshold, the pump speed corresponding to the vehicle speed is determined, and the pump speed has a positive linear relationship with the vehicle speed. The oil pump is controlled to operate at the pumping speed corresponding to the vehicle speed.

7. The heating system according to claim 6, characterized in that, The vehicle speed threshold is a vehicle speed value determined based on the highest rotational speed of the gear transmission device during splash lubrication operation.

8. The heating system according to claim 6, characterized in that, The vehicle controller is also used for: When the vehicle speed is less than the vehicle speed threshold, the oil pump is controlled to operate at the minimum pumping speed of the oil pump.

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