A kind of transfer temperature monitoring method, protection method, transfer and car

Abstract

The application provides a kind of temperature monitoring method of transfer, including the calculation of friction plate temperature.The friction plate temperature is calculated by the comprehensive calculation of ambient temperature, friction plate previous work record temperature, transfer torque, transfer input speed, sliding time, friction plate mass, friction plate heat capacity coefficient, temperature cooling parameter and performance adjustment parameter.The application can simplify the structure of transfer, and prevent the damage of transfer due to high temperature.

Description

Technical Field

[0001] This invention relates to the field of transfer case temperature monitoring and high-temperature protection in automobiles, specifically to a transfer case temperature monitoring method, a protection method, a transfer case, and an automobile. Background Technology

[0002] Currently, longitudinal four-wheel drive systems use a transfer case to transmit power. When the transfer case coil is energized, it attracts the armature and causes the driving ball cam to rotate synchronously with the clutch housing and the input shaft, while the driven ball cam rotates synchronously with the output shaft. When there is a speed difference between the input and output shafts, the two ball cams rotate relative to each other, causing the steel ball sandwiched in the middle to move along the track groove, which in turn causes the driven ball cam to move axially, compressing the clutch pressure plate and friction disc, transmitting torque and generating heat. At this time, the temperature of the lubricating oil in the transfer case and the temperature of the friction disc will both rise.

[0003] In existing technologies, temperature sensors are generally used to monitor the oil temperature or friction plate temperature of the transfer case. Monitoring both temperatures makes the transfer case structure more complex and more expensive. However, if only one temperature is monitored, there will be a large deviation from the actual value, which can easily cause the transfer case to overheat and be damaged. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a transfer case temperature monitoring method, including the calculation of the friction plate temperature. The friction plate temperature is calculated comprehensively based on ambient temperature, the friction plate's previous working recorded temperature, transfer case torque, transfer case input speed, slippage time, friction plate mass, friction plate heat capacity coefficient, temperature cooling parameters, and performance adjustment parameters.

[0005] Furthermore, the temperature of the friction plate is determined by the formula... Calculated, where T 计算 T is the calculated temperature of the transfer case friction plates. 初 Here, c1 represents the ambient temperature, T0 represents the temperature recorded during the previous operation of the friction plate, ρ represents the performance adjustment parameter, N represents the actual torque of the transfer case, w represents the input speed of the transfer case, Δt represents the slippage time, M represents the mass of the friction plate, and c represents the heat capacity coefficient of the friction plate. The temperature cooling parameter c1 and the performance adjustment parameter ρ can be obtained from a limited number of tests. The actual clutch friction plate temperature of the transfer case is calculated using a temperature model.

[0006] Furthermore, the ambient temperature is obtained through a temperature sensor in the vehicle that can measure the ambient temperature, such as the vehicle's air conditioning outside temperature sensor.

[0007] Furthermore, it also includes lubricating oil temperature monitoring, which is achieved by placing a temperature sensor inside the drain plug.

[0008] Also included is a method of high temperature protection for a transfer case, using the monitoring method described above, when the temperature of the friction plate is above a pre-set second temperature threshold, the transfer case coil is disconnected. The second temperature threshold can be set to the clutch friction plate limit temperature.

[0009] Further, when the temperature of the friction plate is above a pre-set first temperature threshold, a warning is issued to the driver, and the first temperature threshold is lower than the second temperature threshold. After the temperature of the friction plate reaches the first threshold, a warning is issued to the driver to take measures such as disconnecting the transfer case coil to reduce the temperature of the friction plate.

[0010] Further, lubricating oil temperature monitoring is also included, by placing a temperature sensor in the oil drain plug, when the temperature of the lubricating oil is above a pre-set fourth temperature threshold, the transfer case coil is disconnected.

[0011] Further, when the temperature of the lubricating oil is above a pre-set third temperature threshold, a warning is issued to the driver, and the third temperature threshold is lower than the fourth temperature threshold.

[0012] Also included is a transfer case, using the high temperature protection method described above.

[0013] Also included is a vehicle, using the transfer case described above.

[0014] The present application can simplify the structure of the transfer case, and prevent the transfer case from being damaged due to excessive temperature. The present application achieves precise control of the temperature inside the transfer case, not just single monitoring of the lubricating oil temperature or clutch disc temperature, but real-time calculation of the actual clutch friction plate temperature of the transfer case through a calculated actual temperature model, the sensor for collecting the lubricating oil temperature of the transfer case is integrated with the oil drain plug of the transfer case, when the actual temperature is not less than the pre-set temperature, the power supply of the transfer case is disconnected, thereby preventing the transfer case from being damaged due to excessive temperature, reducing the temperature sensor in the prior art, the structure is simple, the cost is reduced, at the same time, the disc temperature and the oil temperature can be monitored, making the temperature protection of the transfer case more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The flowchart of embodiment 5 of the present application is shown. DETAILED DESCRIPTION

[0016] The present application will be further described in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for ease of description.

[0017] Embodiment 1:

[0018] The method for monitoring the temperature of the transfer case of the embodiment comprises calculation of the temperature of the friction plate. The temperature of the friction plate is calculated by comprehensively calculating the ambient temperature, the recorded temperature of the friction plate before the last operation, the torque of the transfer case, the rotational speed of the input end of the transfer case, the sliding time, the mass of the friction plate, the heat capacity coefficient of the friction plate, the temperature cooling parameter, and the performance adjustment parameter.

[0019] The data of the ambient temperature, the torque of the transfer case, the rotational speed of the input end of the transfer case, and the sliding time are collected by the vehicle or the transfer case itself, the mass of the friction plate and the heat capacity coefficient of the friction plate are obtained by pre-measurement, and the recorded temperature of the friction plate before the last operation of the transfer case comprises the recorded temperature before the change of the torque of the transfer case and the rotational speed of the input end of the transfer case, and the recorded temperature of the friction plate after the last operation of the transfer case.

[0020] The temperature cooling parameter and the performance adjustment parameter can be obtained through a limited number of tests. A plurality of samples are collected to form a curve of the relationship between the cooling temperature of the friction plate of the transfer case and time as the cooling parameter, and the theoretical cooling temperature is obtained according to the recorded temperature of the friction plate before the last change of the working condition. The actual torque, the input rotational speed, and the sliding time of the friction plate at a plurality of sample temperatures are calculated to obtain a theoretical temperature model, the actual initial temperature value is read, the actual cooling parameter is calculated, the temperature of the friction plate before the last change of the working condition is recorded, and the theoretical temperature model is added to obtain an actual temperature model, and the actual torque, the input rotational speed, and the sliding time of the friction plate are brought into the actual temperature model to obtain the actual temperature of the friction plate.

[0021] The embodiment can simplify the structure of the transfer case and prevent the friction plate of the transfer case from being damaged due to excessively high temperature.

[0022] Embodiment 2:

[0023] The method for monitoring the temperature of the transfer case of the embodiment comprises calculation of the temperature of the friction plate. The temperature of the friction plate is calculated by comprehensively calculating the ambient temperature, the recorded temperature of the friction plate before the last operation, the torque of the transfer case, the rotational speed of the input end of the transfer case, the sliding time, the mass of the friction plate, the heat capacity coefficient of the friction plate, the temperature cooling parameter, and the performance adjustment parameter.

[0024] The data of the ambient temperature, the torque of the transfer case, the rotational speed of the input end of the transfer case, and the sliding time are collected by the vehicle or the transfer case itself, the mass of the friction plate and the heat capacity coefficient of the friction plate are obtained by pre-measurement, and the recorded temperature of the friction plate before the last operation of the transfer case comprises the recorded temperature before the change of the torque of the transfer case and the rotational speed of the input end of the transfer case, and the recorded temperature of the friction plate after the last operation of the transfer case.

[0025] The temperature of the friction plate is calculated by the formula wherein T 计算 is the calculated temperature of the friction plate of the transfer case, T 初Where is the ambient temperature, c1 is the temperature cooling parameter, T0 is the temperature recorded during the previous operation of the friction plate, ρ is the performance adjustment parameter, N is the actual torque of the transfer case, w is the input speed of the transfer case, Δt is the sliding time, M is the mass of the friction plate, and c is the heat capacity coefficient of the friction plate.

[0026] The cooling parameter c1 and performance adjustment parameter ρ can be obtained through a limited number of tests. A curve is generated by collecting multiple sets of samples to show the relationship between the transfer case friction plate cooling temperature and time, serving as the cooling parameter. The theoretical cooling temperature is obtained by recording the transfer case friction plate temperature at the last change in operating conditions. A theoretical temperature model is calculated based on the actual torque, input speed, and friction plate slippage time of the transfer case under multiple sample temperatures. The actual initial temperature value, the calculated actual cooling parameter, and the recorded friction plate temperature at the last change in operating conditions are added to the theoretical temperature model to obtain the actual temperature model. The actual torque, input speed, and friction plate slippage time of the transfer case are then input into the actual temperature model to obtain the actual friction plate temperature.

[0027] This embodiment simplifies the structure of the transfer case and prevents the transfer case friction plates from being damaged due to excessive temperature.

[0028] Example 3:

[0029] The transfer case temperature monitoring method in this embodiment includes the calculation of the friction plate temperature. The friction plate temperature is calculated by comprehensively considering the ambient temperature, the temperature recorded during the previous operation of the friction plate, the transfer case torque, the transfer case input speed, the sliding time, the friction plate mass, the friction plate heat capacity coefficient, temperature cooling parameters, and performance adjustment parameters.

[0030] Ambient temperature is obtained through a temperature sensor in the vehicle that can measure ambient temperature, such as the external temperature sensor of the vehicle's air conditioning system. Transfer case torque, transfer case input speed, and slip time data are collected by the vehicle or the transfer case itself. Friction pad mass and friction pad heat capacity coefficient are obtained through pre-measurement. The friction pad's previous operating temperature is the temperature recorded before the transfer case changes operating conditions, including the recorded temperatures before changes in transfer case torque and transfer case input speed, and the friction pad's recorded temperature after the previous transfer case operation.

[0031] Friction plate temperature is obtained through formula Calculated, where T 计算 T is the calculated temperature of the transfer case friction plates. 初 Where is the ambient temperature, c1 is the temperature cooling parameter, T0 is the temperature recorded during the previous operation of the friction plate, ρ is the performance adjustment parameter, N is the actual torque of the transfer case, w is the input speed of the transfer case, Δt is the sliding time, M is the mass of the friction plate, and c is the heat capacity coefficient of the friction plate.

[0032] The cooling parameter c1 and performance adjustment parameter ρ can be obtained through a limited number of tests. A curve is generated by collecting multiple sets of samples to show the relationship between the transfer case friction plate cooling temperature and time, serving as the cooling parameter. The theoretical cooling temperature is obtained by recording the transfer case friction plate temperature at the last change in operating conditions. A theoretical temperature model is calculated based on the actual torque, input speed, and friction plate slippage time of the transfer case under multiple sample temperatures. The actual initial temperature value, the calculated actual cooling parameter, and the recorded friction plate temperature at the last change in operating conditions are added to the theoretical temperature model to obtain the actual temperature model. The actual torque, input speed, and friction plate slippage time of the transfer case are then input into the actual temperature model to obtain the actual friction plate temperature.

[0033] This embodiment simplifies the structure of the transfer case and prevents the transfer case friction plates from being damaged due to excessive temperature.

[0034] Example 4:

[0035] The transfer case temperature monitoring method in this embodiment includes the calculation of friction plate temperature and lubricating oil temperature monitoring. The friction plate temperature is calculated comprehensively based on ambient temperature, the friction plate's previous operating temperature, transfer case torque, transfer case input speed, slippage time, friction plate mass, friction plate heat capacity coefficient, temperature cooling parameters, and performance adjustment parameters. The lubricating oil temperature is monitored by placing a temperature sensor inside the drain plug.

[0036] Ambient temperature is obtained through a temperature sensor in the vehicle that can measure ambient temperature, such as the external temperature sensor of the vehicle's air conditioning system. Transfer case torque, transfer case input speed, and slip time data are collected by the vehicle or the transfer case itself. Friction pad mass and friction pad heat capacity coefficient are obtained through pre-measurement. The friction pad's previous operating temperature is the temperature recorded before the transfer case changes operating conditions, including the recorded temperatures before changes in transfer case torque and transfer case input speed, and the friction pad's recorded temperature after the previous transfer case operation.

[0037] Friction plate temperature is obtained through formula Calculated, where T 计算 T is the calculated temperature of the transfer case friction plates. 初 Where is the ambient temperature, c1 is the temperature cooling parameter, T0 is the temperature recorded during the previous operation of the friction plate, ρ is the performance adjustment parameter, N is the actual torque of the transfer case, w is the input speed of the transfer case, Δt is the sliding time, M is the mass of the friction plate, and c is the heat capacity coefficient of the friction plate.

[0038] The temperature cooling parameter c1 and the performance adjustment parameter p can be obtained according to a limited number of experiments. A curve of the relationship between the cooling temperature of the transfer case friction plate and time is formed as the cooling parameter through a plurality of sample collection, and a theoretical cooling temperature is recorded when the temperature of the transfer case friction plate changes last time. The actual torque, input speed and friction plate sliding time of the transfer case at a plurality of sample temperatures are used to calculate a theoretical temperature model, the actual initial temperature value read, the actual cooling parameter calculated and the friction plate temperature recorded when the working condition changes last time are added to the theoretical temperature model to obtain an actual temperature model, and the actual torque, input speed and friction plate sliding time of the transfer case are brought into the actual temperature model to obtain the actual friction plate temperature.

[0039] The embodiment can simplify the structure of the transfer case and prevent the transfer case friction plate from being damaged due to excessive temperature. The embodiment realizes accurate control of the temperature inside the transfer case, not only monitors the oil temperature of the lubricating oil or the temperature of the clutch disc, but also calculates the actual clutch friction plate temperature of the transfer case in real time through the actual temperature model calculated, the sensor for collecting the oil temperature of the lubricating oil of the transfer case is integrated with the oil drain plug of the transfer case, and the power supply of the transfer case can be disconnected when the actual temperature is not less than the preset temperature, so that the damage of the transfer case due to excessive temperature is prevented, the temperature sensor in the prior art is reduced, the structure is simple, the cost is reduced, the disc temperature and the oil temperature can be monitored, and the temperature protection of the transfer case is more accurate.

[0040] Embodiment 5:

[0041] Referring to Figure 1 The embodiment is a transfer case high-temperature protection method, which comprises calculation of the temperature of the friction plate. The temperature of the friction plate is calculated by comprehensively calculating the ambient temperature, the last working record temperature of the friction plate, the torque of the transfer case, the input speed of the transfer case, the sliding time, the mass of the friction plate, the heat capacity coefficient of the friction plate, the temperature cooling parameter and the performance adjustment parameter.

[0042] The ambient temperature, the torque of the transfer case, the input speed of the transfer case and the sliding time data are collected by the vehicle or the transfer case itself, the mass of the friction plate and the heat capacity coefficient of the friction plate are obtained by pre-measurement, and the last working record temperature of the friction plate is the record temperature before the working condition of the transfer case changes, which comprises the record temperature before the torque of the transfer case and the input speed of the transfer case change, and the record temperature of the friction plate after the last working of the transfer case ends.

[0043] The temperature cooling parameter and the performance adjustment parameter can be obtained through limited experiments. A plurality of groups of sample collection friction plate cooling temperature and time relationship forming curve is taken as the cooling parameter, and the theoretical cooling temperature is recorded when the last working condition is changed. The actual torque, the input speed, and the friction plate sliding time of the distributor at the plurality of groups of sample temperature are used to calculate the theoretical temperature model. The actual initial temperature value, the calculated actual cooling parameter, and the recorded friction plate temperature when the last working condition is changed are added to the theoretical temperature model to obtain the actual temperature model. The actual torque, the input speed, and the friction plate sliding time of the distributor are brought into the actual temperature model to obtain the actual friction plate temperature.

[0044] When the friction plate temperature is higher than the preset second temperature threshold, the distributor coil is disconnected, and the second temperature threshold can be set as the clutch friction plate limit temperature.

[0045] The embodiment can simplify the structure of the distributor and prevent the distributor friction plate from being damaged due to high temperature.

[0046] Embodiment 6:

[0047] The embodiment is a distributor high-temperature protection method, which comprises measuring and calculating the friction plate temperature. The friction plate temperature is measured and calculated by comprehensively measuring the environmental temperature, the last working record temperature of the friction plate, the distributor torque, the distributor input end speed, the sliding time, the friction plate quality, the friction plate heat capacity coefficient, the temperature cooling parameter, and the performance adjustment parameter.

[0048] The environmental temperature, the distributor torque, the distributor input end speed, and the sliding time data are collected by the vehicle or the distributor itself, the friction plate quality and the friction plate heat capacity coefficient are obtained by pre-measurement, and the last working record temperature of the friction plate is the record temperature before the working condition of the distributor is changed, including the record temperature before the distributor torque and the distributor input end speed change, and the record temperature of the friction plate after the last working of the distributor is finished.

[0049] The temperature cooling parameter and the performance adjustment parameter can be obtained through limited experiments. A plurality of groups of sample collection friction plate cooling temperature and time relationship forming curve is taken as the cooling parameter, and the theoretical cooling temperature is recorded when the last working condition is changed. The actual torque, the input speed, and the friction plate sliding time of the distributor at the plurality of groups of sample temperature are used to calculate the theoretical temperature model. The actual initial temperature value, the calculated actual cooling parameter, and the recorded friction plate temperature when the last working condition is changed are added to the theoretical temperature model to obtain the actual temperature model. The actual torque, the input speed, and the friction plate sliding time of the distributor are brought into the actual temperature model to obtain the actual friction plate temperature.

[0050] When the temperature of the friction plate is higher than a preset second temperature threshold, the transfer clutch coil is disconnected, and the second temperature threshold can be set as the clutch friction plate limit temperature. When the temperature of the friction plate is higher than a preset first temperature threshold, a warning is given to the driver, and the first temperature threshold is lower than the second temperature threshold. After the temperature of the friction plate reaches the first threshold, a warning is given to the driver to make the driver take measures such as disconnecting the transfer clutch coil to reduce the temperature of the friction plate.

[0051] The embodiment can simplify the structure of the transfer clutch and prevent the transfer clutch friction plate from being damaged due to excessively high temperature.

[0052] Embodiment 7:

[0053] The embodiment is a transfer clutch high-temperature protection method, which comprises calculation of the temperature of a friction plate and monitoring of the temperature of lubricating oil. The temperature of the friction plate is calculated by comprehensively calculating the ambient temperature, the last working record temperature of the friction plate, the torque of the transfer clutch, the input speed of the transfer clutch, the sliding time, the mass of the friction plate, the heat capacity coefficient of the friction plate, the temperature cooling parameter, and the performance adjustment parameter. The temperature of the lubricating oil is monitored by arranging a temperature sensor in the oil drain plug.

[0054] The ambient temperature is obtained by a temperature sensor that can measure the ambient temperature in the vehicle, such as an air conditioner outside temperature sensor. The torque of the transfer clutch, the input speed of the transfer clutch, and the sliding time data are collected by the vehicle or the transfer clutch itself, and the mass of the friction plate and the heat capacity coefficient of the friction plate are obtained by pre-measurement. The last working record temperature of the friction plate is the record temperature before the working condition of the transfer clutch is changed, including the record temperature before the torque of the transfer clutch and the input speed of the transfer clutch are changed, and the record temperature of the friction plate after the last working of the transfer clutch is completed.

[0055] The temperature of the friction plate is calculated by the formula wherein T 计算 is the calculated temperature of the friction plate of the transfer clutch, T 初 is the ambient temperature, c1 is the temperature cooling parameter, T0 is the last working record temperature of the friction plate, p is the performance adjustment parameter, N is the actual torque of the transfer clutch, w is the input speed of the transfer clutch, At is the sliding time, M is the mass of the friction plate, and c is the heat capacity coefficient of the friction plate.

[0056] The temperature cooling parameter c1 and the performance adjustment parameter p can be obtained according to a limited number of experiments. A curve of the relationship between the cooling temperature of the transfer case friction plate and time is formed as the cooling parameter through a plurality of sample collection groups, and a theoretical cooling temperature is recorded when the temperature of the transfer case friction plate is changed last time. The actual torque, input speed and friction plate sliding time of the transfer case at a plurality of sample temperatures are used to calculate a theoretical temperature model, the actual initial temperature value read, the actual cooling parameter calculated and the friction plate temperature recorded when the working condition was changed last time are added to the theoretical temperature model to obtain an actual temperature model, and the actual torque, input speed and friction plate sliding time of the transfer case are brought into the actual temperature model to obtain the actual friction plate temperature.

[0057] When the temperature of the friction plate is higher than a preset second temperature threshold, the transfer case coil is disconnected, and the second temperature threshold can be set as the limit temperature of the clutch friction plate. When the temperature of the friction plate is higher than a preset first temperature threshold, a warning is given to the driver, and the first temperature threshold is lower than the second temperature threshold. After the temperature of the friction plate reaches the first threshold, a warning is given to the driver to make the driver take measures such as disconnecting the transfer case coil to reduce the temperature of the friction plate. When the temperature of the lubricating oil is higher than a preset fourth temperature threshold, the transfer case coil is disconnected to protect the transfer case.

[0058] The embodiment can simplify the structure of the transfer case and prevent the transfer case friction plate from being damaged due to excessive temperature. The embodiment realizes accurate control of the temperature inside the transfer case, not only monitors the lubricating oil temperature or the clutch disc temperature, but also calculates the actual clutch friction plate temperature of the transfer case in real time through the actual temperature model calculated, the sensor for collecting the lubricating oil temperature of the transfer case is integrated with the oil drain plug of the transfer case, the transfer case can be disconnected when the actual temperature is not less than the preset temperature, thereby preventing the transfer case from being damaged due to excessive temperature, reducing the temperature sensor in the prior art, simplifying the structure and reducing the cost, and at the same time, the disc temperature and the oil temperature can be monitored, so that the temperature protection of the transfer case is more accurate.

[0059] Embodiment 8:

[0060] The embodiment is a high-temperature protection method for a transfer case, which includes calculation of the temperature of a friction plate and monitoring of the temperature of lubricating oil. The temperature of the friction plate is calculated through the ambient temperature, the last working record temperature of the friction plate, the torque of the transfer case, the input speed of the transfer case, the sliding time, the mass of the friction plate, the heat capacity coefficient of the friction plate, the temperature cooling parameter and the performance adjustment parameter. The temperature of the lubricating oil is monitored through the temperature sensor arranged in the oil drain plug.

[0061] The ambient temperature is obtained by a temperature sensor that measures the ambient temperature in the vehicle, such as an outside temperature sensor of a vehicle air conditioner. The transfer case torque, the transfer case input speed and the slip time data are collected by the vehicle or the transfer case itself, and the friction plate mass and the friction plate heat capacity coefficient are obtained by pre-measurement. The friction plate last working record temperature is the record temperature before the working condition of the transfer case is changed, including the record temperature before the transfer case torque and the transfer case input speed are changed, and the record temperature of the friction plate after the last working of the transfer case is finished.

[0062] The friction plate temperature is obtained by the formula wherein T 计算 is the calculated temperature of the transfer case friction plate, T 初 is the ambient temperature, c1 is the temperature cooling parameter, T0 is the friction plate last working record temperature, p is the performance adjustment parameter, N is the actual torque of the transfer case, w is the input speed of the transfer case, At is the slip time of the friction plate, M is the mass of the friction plate, and c is the heat capacity coefficient of the friction plate.

[0063] The temperature cooling parameter c1 and the performance adjustment parameter p can be obtained according to a limited number of tests. The relationship between the cooling temperature of the transfer case friction plate and the time is formed into a curve as the cooling parameter by collecting a plurality of samples, and the theoretical cooling temperature is obtained according to the friction plate temperature of the last working condition change. The actual torque, the input speed and the slip time of the friction plate at a plurality of sample temperatures are used to calculate a theoretical temperature model, the actual initial temperature value is read, the actual cooling parameter is calculated, and the last working condition change is recorded to obtain the actual temperature model. The actual torque, the input speed and the slip time of the friction plate are brought into the actual temperature model to obtain the actual friction plate temperature.

[0064] When the friction plate temperature is higher than a preset second temperature threshold, the transfer case coil is disconnected, and the second temperature threshold can be set as the limit temperature of the clutch friction plate. When the friction plate temperature is higher than a preset first temperature threshold, a warning is given to the driver, and the first temperature threshold is lower than the second temperature threshold. After the friction plate temperature reaches the first threshold, a warning is given to the driver to make the driver take measures such as disconnecting the transfer case coil to reduce the friction plate temperature. When the lubricating oil temperature is higher than a preset fourth temperature threshold, the transfer case coil is disconnected to protect the transfer case. When the lubricating oil temperature is higher than a preset third temperature threshold, a warning is given to the driver, and the third temperature threshold is lower than the fourth temperature threshold. A warning is given to the driver to make the driver take measures such as disconnecting the transfer case coil to reduce the lubricating oil temperature.

[0065] The embodiment can simplify the structure of the transfer case and prevent the transfer case friction plate from being damaged due to excessive temperature. The embodiment realizes accurate control of the temperature inside the transfer case. Instead of only monitoring the lubricating oil temperature or the clutch disc temperature, the actual clutch friction plate temperature of the transfer case is calculated in real time through the calculated actual temperature model. The sensor for collecting the lubricating oil temperature of the transfer case is integrated with the oil drain plug of the transfer case. When the actual temperature is not less than the preset temperature, the power supply of the transfer case is disconnected, thereby preventing the transfer case from being damaged due to excessive temperature and reducing the temperature sensor in the prior art. The structure is simple, the cost is reduced, the disc temperature and the oil temperature can be monitored, the temperature protection of the transfer case is more accurate, and the problems are solved.

[0066] Embodiment 9

[0067] The embodiment is a transfer case using the high-temperature protection method in the above embodiments.

[0068] Embodiment 10

[0069] The embodiment is a vehicle using the transfer case in embodiment 9.

[0070] Any modification, change, or the like made by those of ordinary skill in the art according to the above embodiments of the present application, without departing from the purpose of the present application, should be included in the protection scope of the present application.

Claims

1. A method for monitoring the temperature of a transfer case, characterized in that: This includes the calculation of friction plate temperature; the friction plate temperature is calculated by comprehensively considering ambient temperature, the temperature recorded during the previous operation of the friction plate, transfer case torque, transfer case input speed, sliding time, friction plate mass, friction plate heat capacity coefficient, temperature cooling parameters, and performance adjustment parameters. The temperature of the friction plate is determined by the formula... Calculated, where T 计算 The calculated temperature of the transfer case friction plate is given by: Tinitial, Tc1, T0, Td ...

2. The transfer case temperature monitoring method according to claim 1, characterized in that: The ambient temperature is obtained through a temperature sensor in the vehicle that can measure the ambient temperature.

3. The transfer case temperature monitoring method according to claim 2, characterized in that: It also includes lubricating oil temperature monitoring, which is achieved by placing a temperature sensor inside the drain plug.

4. A method for high-temperature protection of a transfer case, characterized in that: Using the monitoring method described in any one of claims 1-2, when the temperature of the friction plate is higher than a preset second temperature threshold, the transfer case coil is disconnected.

5. The high-temperature protection method for the transfer case according to claim 4, characterized in that: When the temperature of the friction pads exceeds a preset first temperature threshold, a warning is issued to the driver; when the first temperature threshold is below a second temperature threshold.

6. The high-temperature protection method for the transfer case according to claim 5, characterized in that: It also includes lubricating oil temperature monitoring, which uses a temperature sensor installed in the drain plug to monitor the lubricating oil temperature. When the lubricating oil temperature is higher than a preset fourth temperature threshold, the transfer case coil is disconnected.

7. The high-temperature protection method for a transfer case according to claim 6, characterized in that: When the lubricating oil temperature is higher than the preset third temperature threshold, a warning is issued to the driver; when the third temperature threshold is lower than the fourth temperature threshold.

8. A transfer case, characterized in that: Use the high-temperature protection method as described in any one of claims 4-7.

9. A vehicle, characterized in that: Use the transfer case as described in claim 8.

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