Braking system over-temperature monitoring methods, calibration devices and commercial vehicles

Abstract

This application relates to a method for monitoring over-temperature of a braking device, a calibration device, and a commercial vehicle, comprising: obtaining the temperature of a steel sheet based on a thermistor within the calibration device; calibrating different transmission oil temperature thresholds and permissible number of braking operations corresponding to different upshift conditions; determining the execution condition based on the current gear and the target gear; and, when braking is applied during an upshift, obtaining the current transmission oil temperature C. a and the number of times the braking system is used; based on the current transmission fluid temperature (C). a By comparing the transmission fluid temperature with the threshold value for the corresponding upshifting condition, or the number of braking device uses with the allowable number of braking device uses, the transmission temperature can be determined to be normal. During upshifting, by comparing the current transmission fluid temperature with the threshold value and the number of braking device uses with the allowable number of braking device uses, the temperature status information of the braking device can be obtained, reducing the number of temperature sensors in the braking device and lowering manufacturing costs.

Description

Technical Field

[0001] This application relates to the automotive field, and in particular to a method for monitoring over-temperature of a braking device, a calibration device, and a commercial vehicle. Background Technology

[0002] In the automotive industry, the upshifting process requires the intermediate shaft brake to slow down the vehicle until the target speed difference is reached before shifting gears. During this process, kinetic energy is converted into heat energy, causing the temperature of the steel plates and friction pads inside the brake, as well as the transmission lubricating oil, to rise.

[0003] To ensure the quality and lifespan of the transmission shifting, the steel plates and friction pads inside the brake, as well as the transmission lubricant, must be kept away from overheating. To monitor the temperature of the steel plates and / or friction pads, temperature sensors need to be installed on them. However, these temperature sensors operate in harsh environments, making it difficult to guarantee their lifespan. Furthermore, installing temperature sensors on the steel plates and / or friction pads will increase manufacturing costs. Summary of the Invention

[0004] The first technical problem addressed by this application is to provide a method for monitoring over-temperature of a braking device, which can effectively solve the problem of high manufacturing costs.

[0005] The second technical problem addressed by this application is to provide a calibration device that can effectively solve the problem of calibrating the transmission oil temperature threshold and the permissible number of braking devices.

[0006] The third technical problem addressed by this application is to provide a commercial vehicle that effectively solves the problem of over-temperature protection for the commercial vehicle's transmission without increasing manufacturing costs.

[0007] To address the first technical problem, this application provides a method for monitoring over-temperature in a braking device, comprising:

[0008] Determine the operating conditions based on the current gear and the target gear;

[0009] When the operating condition is upshifting and braking is in progress, obtain the current transmission oil temperature C. a and the number of times the braking device is used;

[0010] Based on the current transmission oil temperature C a The transmission oil temperature threshold corresponding to the current upshift condition, and / or the number of times the braking device is used compared to the allowable number of times the braking device is used corresponding to the current upshift condition, are used to determine whether the transmission temperature is normal.

[0011] The over-temperature monitoring method for the braking device in the above embodiments can obtain the temperature status information of the braking device without monitoring its temperature when performing upshifting, based on a comparison between the current transmission oil temperature and the transmission oil temperature threshold, and a comparison between the number of times the braking device is used and the number of times the braking device is allowed to be used. This reduces the number of temperature sensors in the braking device and lowers manufacturing costs.

[0012] In one implementation, upshifting conditions include starting, shifting, and skipping gears.

[0013] In one embodiment, the brake over-temperature monitoring method further includes the step of calibrating the transmission oil temperature threshold and the permissible number of brake applications corresponding to different upshift conditions, specifically including:

[0014] The intermediate shaft is controlled to run at the preset initial speed for the upshift condition to be calibrated and the initial temperature T of the steel sheet is obtained. n ;

[0015] The braking device is controlled to apply the brakes, reducing the speed of the intermediate shaft to the target speed preset for the upshifting condition to be calibrated.

[0016] Obtain the current temperature T of the steel sheet n+1 ;

[0017] According to T n and T n+1 Determine if the steel sheet is overheated;

[0018] If it is determined that the steel sheet has not overheated, the control intermediate shaft returns to the initial speed of the upshift condition to be calibrated and obtains the initial temperature T of the steel sheet. n The steps are repeated cyclically, and the number of cycles is incremented by one; if the steel sheet is determined to be overheated, the intermediate shaft operation is terminated and the number of cycles and the gearbox oil temperature C are obtained. n Proceed to the next step;

[0019] Determine the gearbox oil temperature C when the steel sheet is overheated. n The transmission oil temperature threshold corresponding to the upshift condition to be calibrated is used as the number of cycles n when the steel sheet overheats, which is then used as the number of times the braking device can be used corresponding to the upshift condition to be calibrated.

[0020] Repeat the above steps to calibrate the transmission oil temperature threshold and the number of times the braking device can be used for different upshift conditions.

[0021] In one embodiment, the transmission oil temperature C is obtained. n include:

[0022] Preset initial transmission oil temperature C0;

[0023] Transmission oil temperature C nThe initial transmission oil temperature C0 is obtained by increasing the cycle number n in a gradient value X. n =C0+nX.

[0024] In one implementation, according to T n and T n+1 Determining whether a steel sheet is overheated includes:

[0025] At the current temperature T n+1 The maximum allowable temperature T of the steel sheet is greater than or equal to that of the steel sheet. max And T n+1 With T n If the difference is less than the single temperature rise value δ, the steel sheet is determined to be overheated.

[0026] In one embodiment, based on the current transmission oil temperature C a The transmission fluid temperature threshold corresponding to the current upshift condition, and / or the number of braking device uses compared to the allowable number of braking device uses corresponding to the current upshift condition, are used to determine whether the transmission temperature is normal, including:

[0027] When the current transmission oil temperature C is met a If either the transmission oil temperature exceeds the threshold value corresponding to the current upshift condition or the number of times the braking device has been used exceeds the allowable number of times the braking device has been used corresponding to the current upshift condition, the transmission temperature is determined to be abnormal.

[0028] To address the second technical problem, this application provides a calibration device, comprising:

[0029] Thermistor sensors, which can be detachably mounted on the steel plates of the braking device, are used to collect the temperature of the steel plates.

[0030] The control module can connect to the thermal sensor and the commercial vehicle's controller. Based on the temperature of the steel sheet collected by the thermal sensor, the control module can calibrate the transmission oil temperature threshold and the number of times the braking device can be used for different upshifting conditions of the commercial vehicle, and input the transmission oil temperature threshold and the number of times the braking device can be used into the controller.

[0031] The calibration device in the above embodiments uses a thermal sensor mounted on the steel sheet of the braking device. Based on the temperature of the steel sheet collected by the thermal sensor, different transmission oil temperature thresholds and permissible number of brake applications corresponding to different upshift conditions are calibrated. After calibration, the calibration device can be removed from the intermediate shaft, preventing damage to the thermal sensor caused by prolonged operation in harsh environments. Furthermore, as a detection component, the thermal sensor can be used in different transmissions, eliminating the need for a temperature detector within the transmission's braking device and reducing transmission manufacturing costs.

[0032] In one embodiment, the braking device includes at least three steel plates and at least two friction plates arranged in alternating stacks; a thermal sensor is mounted on the steel plate located between the two friction plates within the braking device.

[0033] Regarding the third technical problem, this application provides a commercial vehicle, including:

[0034] The controller includes a storage module, a processing module, and a computer program stored on the storage module and executable on the processing module. When the processing module executes the computer program, it implements the over-temperature monitoring method for the braking device as described in the above embodiments.

[0035] The braking device, transmission fluid temperature sensor and warning module are all electrically connected to the controller;

[0036] In the event of abnormal transmission temperature, the controller can activate the warning module to issue an alarm signal.

[0037] The commercial vehicle in the above embodiments, provided by this application, effectively calibrates different transmission oil temperature thresholds and the number of times the braking device can be used for different upshifting conditions through the braking protection device in the above embodiments, so as to enable the commercial vehicle to accurately monitor the transmission temperature when upshifting and to promptly warn the user when the transmission overheats, thereby achieving protection of the transmission.

[0038] In one embodiment, the braking device includes a steel plate, a friction pad, and a driver;

[0039] The actuator includes a brake piston housing, a piston, and an air pump. The piston is slidably connected inside the brake piston housing. One end of the piston and the brake piston housing form an air chamber. The other end of the piston presses against the brake pad. The air pump is connected to the air chamber. Attached Figure Description

[0040] Figure 1 A cross-sectional view of a braking device provided in an embodiment of this application.

[0041] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0042] Figure 3 This is a schematic diagram showing the position of the thermistor installed on the brake pad body according to an embodiment of this application.

[0043] Figure 4 This is a schematic diagram of the process for overheat calibration of the brake pads in an embodiment of this application.

[0044] Figure 5 This is a schematic diagram of the process for controlling and monitoring the overheating of the steel sheet using a braking device according to an embodiment of this application.

[0045] Figure label:

[0046] 1. Brake piston housing;

[0047] 11. Air cavity;

[0048] 2. Piston;

[0049] 21. Sealing end; 22. Press-fit end;

[0050] 3. Steel sheet;

[0051] 31. Ring body; 32. Projection; 33. Positioning groove;

[0052] 311. Circumferential edge;

[0053] 321. Top surface; 322. Transition surface;

[0054] 4. Friction plates;

[0055] 5. Thermistor;

[0056] 6. Sealing ring. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0058] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0059] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0061] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0063] In some embodiments of this application, reference is made to Figure 3As shown, this application provides a calibration device, a thermal sensor 5, and a control module. The thermal sensor 5 is detachably mounted on the braking device of a commercial vehicle. The thermal sensor 5 is used to collect the temperature of the steel sheet 3 inside the braking device. This calibration device calibrates different transmission oil temperature thresholds and the permissible number of braking applications for different upshifting conditions of the commercial vehicle. The calibrated transmission oil temperature thresholds and permissible number of braking applications are then input as parameter values ​​into the commercial vehicle controller. During subsequent normal upshifting of the commercial vehicle, the parameter values ​​of the transmission oil temperature thresholds and the permissible number of braking applications can be compared to determine whether the transmission is in a normal state. Combined with... Figure 1 , 2 As shown, the braking device of a commercial vehicle includes a brake pad body and a driver. The brake pad body comprises at least three stacked steel plates 3 and at least two friction plates 4, the friction plates 4 being connected to an intermediate shaft. The steel plates 3 and friction plates 4 are stacked alternately, with the friction plates 4 sandwiched between two steel plates 3. The driver compresses the brake pad body, causing the steel plates 3 to clamp the friction plates 4 to achieve braking. A thermistor 5 is mounted on the steel plates 3, and the temperature of the steel plates 3 is detected and obtained as an operating parameter. The friction plates 4 have internal splines, allowing them to be fixedly connected to the intermediate shaft. The steel plates 3 rub against the friction plates 4 to reduce the rotational speed of the intermediate shaft.

[0064] Specifically, the driver compresses one side of the steel plate 3, causing the steel plate 3 and friction plate 4 within the brake pad body to press against each other, increasing the friction between the steel plate 3 and friction plate 4, thereby slowing down the intermediate shaft. Simultaneously, the increased friction between the steel plate 3 and friction plate 4 leads to a rise in temperature on both surfaces. Furthermore, heat energy from the friction plate 4 is transferred to the steel plate 3, causing the temperature of the steel plate 3 to gradually increase with each braking cycle.

[0065] Further, refer to Figure 4 The method for calibrating the transmission oil temperature threshold and the number of times the braking device can be used includes: obtaining the temperature of the steel sheet 3 based on the thermistor 5 in the calibration device, and calibrating different transmission oil temperature thresholds and the number of times the braking device can be used for different upshift conditions.

[0066] Specifically, based on the temperature of the steel sheet 3 obtained by the thermistor 5 in the calibration device, different transmission oil temperature thresholds and permissible number of braking device applications corresponding to different upshift conditions are calibrated, including:

[0067] S1. Obtain the transmission oil temperature C n ;

[0068] S2. The intermediate shaft runs at the initial speed and obtains the initial temperature T of the steel sheet 3. n ;

[0069] S3. Activate the intake valve of the braking device to brake and reduce the intermediate shaft to the target speed;

[0070] S4. Obtain the current temperature T of the thermistor 5 on the steel sheet 3. n+1 ;

[0071] S5. According to T n and T n+1 Determine if steel sheet 3 is overheated;

[0072] S51. If it is determined that steel sheet 3 is overheated, the intermediate shaft operation shall be terminated;

[0073] S52. If it is determined that steel sheet 3 has not overheated, repeat the above steps;

[0074] S6. Calibrate transmission oil temperature (C) n The number of cycles, n, is used as the transmission oil temperature threshold and the allowable number of braking devices, and is saved.

[0075] The initial and target speeds are preset according to different upshifting conditions. n represents the number of braking operations performed by the calibration device during calibration.

[0076] Multiple sets of transmission oil temperature thresholds and permissible braking device usage counts can be calibrated based on operation under different upshift conditions. In this solution, upshift conditions include at least starting, shifting, and skipping gears. For example, the initial speed for starting is 600 rpm, and the target speed is 200 rpm. The initial speed for shifting is 1200 rpm, and the target speed is 700 rpm. The initial speed for skipping gears is 1500 rpm, and the target speed is 800 rpm.

[0077] Furthermore, the thermal sensor 5 is mounted on the steel plate 3 located between the two friction plates 4. The steel plate 3 located between the two friction plates 4 has a higher temperature, and more heat generated by the friction between the two friction plates 4 and the steel plate 3 is transferred to the steel plate 3 between the two friction plates 4, causing the temperature of the steel plate 3 between the two friction plates 4 to rise even higher. The steel plate 3 located between the two friction plates 4 is more prone to overheating, and excessively high temperatures can lead to burning of the braking device or a decrease in deceleration response.

[0078] Specifically, the steel sheet 3 includes a ring 31 and protrusions 32 evenly distributed on the circumferential edge 311 of the ring 31. For example, there are three protrusions 32. The circumferential edge 311 of the ring 31 is located on the outer surface of the ring 31, and the protrusions 32 are located on the outer surface of the ring 31, protruding from the outer surface of the ring 31. Each protrusion 32 includes an adjacent top surface 321 and a transition surface 322, which is connected to the outer surface of the ring 31. A positioning groove 33 is provided on the top surface 321 to restrict the position of the steel sheet 3. Corresponding positioning grooves 33 are also provided on the steel sheet 3, and positioning posts are engaged within the positioning grooves 33, thus fixing the relative positions of the multiple steel sheets 3. There are at least two thermal sensors 5, which are circumferentially distributed on the steel sheet 3. For example, the number of thermal sensors 5 on a single steel sheet 3 is consistent with the number of protrusions 32, and the thermal sensors 5 are mounted on the transition surface 322.

[0079] Among them, the initial temperature T of steel sheet 3 is obtained. n And obtain the current temperature T of the thermistor 5 on the steel sheet 3. n+1 The temperature of the steel sheet 3 is obtained by acquiring the temperature values ​​of multiple thermal sensors 5 and taking the average of the multiple temperature values.

[0080] More specifically, the thermal sensor 5 includes, but is not limited to, being disposed on a single steel sheet 3; multiple steel sheets 3 may each have multiple thermal sensors 5 disposed on them. Obtaining the temperature of the steel sheet 3 includes: taking multiple average values ​​of the temperature values ​​from the thermal sensors 5 on the multiple steel sheets 3, and then taking the highest value among these average values ​​as the temperature of the steel sheet 3. Since the temperature on different steel sheets 3 is not the same during braking, to ensure that none of the steel sheets 3 overheat, the temperature of the steel sheet 3 operating in the most severe environment is taken as the temperature of the steel sheet 3.

[0081] In one specific embodiment, the actuator includes a brake piston housing 1, a piston 2, and an air pump. The piston 2 is slidably connected inside the brake piston housing 1. One end of the piston 2 and the brake piston housing 1 form an air chamber 11, and the other end of the piston 2 can be pressed against the brake pad. The air pump is connected to the air chamber 11. In this design, the piston 2 is provided with a sealing ring 6, which is used to fill the gap between the piston 2 and the inner wall of the brake piston housing 1, thereby improving the sealing performance of the air chamber 11.

[0082] In step S52, if it is determined that the steel sheet 3 has not overheated, the process returns to step S1 for a loop. Specifically, after returning to step S1, a y-second interval is required before braking is performed to prevent the steel sheet 3 from overheating. For example, braking is performed after a 5-second interval.

[0083] In some embodiments of this application, reference is made to Figure 5 This application provides a method for monitoring over-temperature of a braking device, which includes at least the following steps:

[0084] The temperature of the steel sheet 3 is obtained by the thermistor 5 in the calibration device, and the different transmission oil temperature thresholds and the number of times the braking device can be used are calibrated for different upshift conditions.

[0085] Determine the operating condition based on the current gear N1 and the target gear N2;

[0086] When the operating condition is upshifting and braking is in progress, obtain the current transmission oil temperature C. a and the number of times the braking device is used;

[0087] Based on the current transmission oil temperature C a The transmission temperature is determined to be normal by comparing the transmission oil temperature threshold for the corresponding upshifting condition, or the number of times the braking device is used with the allowable number of times the braking device is used.

[0088] In this solution, during upshifting, the temperature status of the braking system is obtained by comparing the current transmission fluid temperature with the transmission fluid temperature threshold and the number of braking system uses with the allowable number of braking system uses, without needing to monitor the braking system temperature. This reduces the number of temperature sensors within the braking system and lowers manufacturing costs. Furthermore, the calibration device in the above embodiment is reusable, allowing for the calibration of transmission fluid temperature thresholds and allowable number of braking system uses on multiple commercial vehicles using a single device, further reducing costs.

[0089] In some embodiments of this application, S1 includes:

[0090] Preset initial transmission oil temperature C0;

[0091] Transmission oil temperature C n The initial transmission oil temperature C0 is obtained by increasing the cycle number n in a gradient value X. n =C0+nX.

[0092] For example, the gradient value X is 10℃, C n = -30℃, -20℃…130℃. It should be noted that C… n It can be C0+10n, C n It can also be obtained by using the temperature range within the interval and by curve fitting.

[0093] Furthermore, the characterization of the overheating of steel sheet 3 includes:

[0094] Current temperature T n+1 The maximum allowable temperature T of steel sheet 3 is greater than or equal to that of steel sheet 3. max ;as well as

[0095] T n+1 With T n The difference is less than the single temperature rise value δ.

[0096] Specifically, first determine whether the temperature of the steel sheet is lower than the maximum allowable temperature T of steel sheet 3. max If it is less than this value, it means that the current temperature rise is safe, and then use T n+1 With T n The difference is compared, and this value represents the temperature rise of the steel sheet in one cycle. If T n+1 With T n The difference is less than the single temperature rise value δ, indicating that the steel sheet is overheated. However, if T... n+1 With T n If the difference is greater than or equal to the single temperature rise value δ, return to S1 for a cycle until the temperature of steel sheet 3 no longer increases and reaches a stable value.

[0097] The maximum allowable temperature T of steel sheet 3 max The maximum allowable temperature T of steel sheet 3 is obtained through a preset method. max The preset value needs to take into account two factors: the highest operating temperature of the friction plate 4 and the highest permissible temperature of the transmission oil. For example, this calibration is set to 180°C.

[0098] Furthermore, based on the current transmission oil temperature C a To determine if the transmission temperature is normal, the following parameters are used: the transmission oil temperature threshold for the corresponding upshifting condition, or the number of braking device uses versus the allowable number of braking device uses.

[0099] When the current transmission oil temperature C is met a The transmission oil temperature C is greater than the output temperature under the corresponding upshift condition. n If any of the following conditions is met, the transmission temperature is determined to be abnormal: the number of times the braking device is used exceeds the number of cycles n corresponding to the upshift condition.

[0100] In some embodiments of this application, a commercial vehicle is also provided, including a controller, the aforementioned braking device, a transmission fluid temperature sensor, and a warning module. The controller includes a storage module, a processing module, and a computer program stored in the storage module and executable on the processing module. The storage module also stores different transmission fluid temperature thresholds and permissible braking device usage counts corresponding to different upshifting conditions, calibrated using the calibration device in the above embodiments. The processing module executes the computer program to implement the braking device over-temperature monitoring method in the above embodiments. Both the transmission fluid temperature sensor and the warning module are electrically connected to the controller.

[0101] When a commercial vehicle is in upshift mode, the controller acquires the current transmission fluid temperature C monitored by the transmission fluid temperature sensor. a And record the number of times the braking device is used.

[0102] Based on the current transmission oil temperature C aBy comparing the transmission oil temperature threshold and the number of times the braking device is used with the allowable number of times the braking device is used under the corresponding upshifting conditions, it can be determined whether the transmission temperature is normal.

[0103] In the event of abnormal transmission temperature, the controller can activate the warning module to issue an alarm signal.

[0104] Specifically, to determine whether a commercial vehicle is in an upshifting condition, the current gear N1 of the transmission and the target gear N2 of the transmission are used. If the difference between the target gear N2 and the current gear N1 is greater than or equal to 1, it indicates that the transmission is upshifting. When the commercial vehicle is in an upshifting condition, the controller executes the above-mentioned over-temperature monitoring method of the braking device to monitor whether the transmission temperature is over-temperature.

[0105] In specific embodiments, the processor may include one or more CPUs, each of which may be a single-core processor or a multi-core processor. Here, "processor" may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0106] The memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited to these. The memory can exist independently or it can be integrated onto the processor.

[0107] The memory stores the data in this application and the computer execution instructions corresponding to the computer program of this application. The processor can realize various functions of the control element by running or executing the computer program stored in the memory and by calling the data stored in the memory.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for monitoring over-temperature of a braking device, characterized in that, include: Determine the operating conditions based on the current gear and the target gear; When the operating condition is upshifting and braking is in progress, obtain the current transmission oil temperature C. a and the number of times the braking device is used; Based on the current transmission oil temperature C a The transmission oil temperature threshold corresponding to the current upshift condition, and / or the number of times the braking device is used compared with the allowable number of times the braking device is used corresponding to the current upshift condition, are used to determine whether the transmission temperature is normal. The braking device over-temperature monitoring method further includes the step of calibrating the transmission oil temperature threshold and the permissible number of braking device uses corresponding to different upshift conditions, specifically including: The intermediate shaft is controlled to run at the preset initial speed for the upshift condition to be calibrated and the initial temperature Tn of the steel sheet (3) is obtained; The braking device is controlled to apply the brakes, reducing the speed of the intermediate shaft to the target speed preset for the upshifting condition to be calibrated. Obtain the current temperature Tn+1 of the steel sheet (3); Determine whether the steel sheet (3) is overheated based on Tn and Tn+1; If it is determined that the steel sheet (3) is not overheated, the process of returning to the control intermediate shaft to run at the initial speed of the upshift condition to be calibrated and obtaining the initial temperature Tn of the steel sheet (3) is repeated, and the number of cycles is incremented by one; if it is determined that the steel sheet (3) is overheated, the intermediate shaft operation is terminated and the number of cycles and the transmission oil temperature Cn are obtained, and the next step is performed. The transmission oil temperature Cn when the steel sheet overheats is determined as the transmission oil temperature threshold corresponding to the upshift condition to be calibrated, and the number of cycles n when the steel sheet overheats is determined as the number of times the braking device can be used corresponding to the upshift condition to be calibrated. Repeat the above steps to calibrate the transmission oil temperature threshold and the number of times the braking device can be used for different upshift conditions.

2. The method for monitoring over-temperature of a braking device according to claim 1, characterized in that, The upshifting conditions include starting, shifting gears, and skipping gears.

3. The method for monitoring over-temperature of a braking device according to claim 1, characterized in that, The acquisition of transmission oil temperature C n include: Preset initial transmission oil temperature C0; Transmission oil temperature C n The initial oil temperature C0 of the transmission is obtained by increasing the number of cycles n in a gradient value X. n =C0+nX.

4. The method for monitoring over-temperature of a braking device according to claim 1, characterized in that, According to T n and T n+1 Determining whether the steel sheet (3) is overheated includes: At the current temperature T n+1 The maximum allowable temperature T of the steel sheet (3) is greater than or equal to the maximum allowable temperature. max And T n+1 With T n If the difference is less than the single temperature rise value δ, the steel sheet (3) is determined to be overheated.

5. The method for monitoring over-temperature of a braking device according to claim 1, characterized in that, The current transmission oil temperature C is used as a reference. a Determining whether the transmission temperature is normal based on the transmission oil temperature threshold corresponding to the current upshift condition, and / or the number of times the braking device is used compared to the allowable number of times the braking device is used corresponding to the current upshift condition, includes: When the current transmission oil temperature C is met a If either the transmission oil temperature exceeds the threshold value corresponding to the current upshift condition or the number of times the braking device is used exceeds the allowable number of times the braking device is used corresponding to the current upshift condition, the transmission temperature is determined to be abnormal.

6. A calibration device, characterized in that, The calibration device, used to perform the over-temperature monitoring method for a braking device as described in any one of claims 1-5, comprises: A thermal sensor (5) is detachably mounted on the steel sheet (3) of the braking device for collecting the temperature of the steel sheet (3). The control module can be connected to the thermal sensor (5) and the controller of the commercial vehicle. The control module can calibrate the transmission oil temperature threshold and the number of times the braking device can be used for different upshifting conditions of the commercial vehicle based on the temperature of the steel sheet (3) collected by the thermal sensor (5), and input the transmission oil temperature threshold and the number of times the braking device can be used into the controller.

7. The calibration device according to claim 6, characterized in that, The braking device includes at least three steel plates (3) and at least two friction plates (4) arranged alternately; the thermal sensor (5) is mounted on the steel plate (3) located between the two friction plates (4) in the braking device.

8. A commercial vehicle, characterized in that, include: The controller includes a storage module, a processing module, and a computer program stored on the storage module and executable on the processing module. When the processing module executes the computer program, it implements the over-temperature monitoring method for the braking device as described in any one of claims 1-5. as well as The system includes a braking device, a transmission fluid temperature sensor, and a warning module, wherein the transmission fluid temperature sensor and the warning module are both electrically connected to the controller. In the event of an abnormal transmission temperature, the controller can control the warning module to issue an alarm signal.

9. The commercial vehicle according to claim 8, characterized in that, The braking device includes a steel plate (3), a friction plate (4), and a driver; The actuator includes a brake piston housing (1), a piston (2), and an air pump. The piston (2) is slidably connected inside the brake piston housing (1). One end of the piston (2) and the brake piston housing (1) form an air chamber (11). The other end of the piston (2) presses against the brake pad body. The air pump is connected to the air chamber (11).

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