Vehicle overheating protection control method, device and system

Abstract

The present invention provides a vehicle overheat protection control method, device, and system. The vehicle overheat protection control method includes: obtaining a first temperature of a transfer case and real-time vehicle condition information of the vehicle, and determining whether the first temperature meets a first preset condition; determining whether the vehicle's gear has been switched from the first gear to the second gear based on the vehicle's gear information; determining a second temperature of the transfer case based on the real-time vehicle condition information; when the first gear is switched to the second gear, determining whether the second temperature meets the second preset condition; when the first temperature meets the first preset condition and the second temperature meets the second preset condition, controlling the heat dissipation component in the vehicle to switch from the first working state to the second working state, and controlling the transfer case to switch from the working state to the torque disconnect state to dissipate heat from the transfer case. This more thoroughly dissipates heat from the transfer case, preventing ablation of the friction group within the transfer case.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle overheating protection control method, device and system. Background Art

[0002] The vehicle transfer case is a key component in achieving four-wheel drive in a vehicle's powertrain. Transfer cases are categorized as full-time, part-time, and part-time four-wheel drive. Part-time four-wheel drive typically utilizes a wet clutch. When a wet clutch is operating, sliding friction occurs between the paired steel plates and friction plates. Frictional heat is absorbed by the paired steel plates, friction plates, and lubricant. When the surface temperature of the friction pair exceeds the maximum temperature designed for the friction pair, the friction pair will fail. Therefore, a thermal protection strategy must be established to protect the wet clutch's friction plate pack and reduce its temperature when it overheats.

[0003] At present, the existing transfer case friction group is lubricated and cooled by an oil pump. However, the oil pump is a one-way rotor pump. When the vehicle is in forward gear (D gear), the oil pump can lubricate the friction group. When the vehicle is in reverse gear (R gear), the oil pump does not pump oil and cannot lubricate the friction group. It only relies on the chain to stir the oil for splash lubrication. The poor lubrication effect can easily cause slow cooling, which in turn causes the vehicle to use R gear for a long time when getting out of trouble. The temperature of the friction group will rise sharply due to poor cooling, resulting in friction group burning. Summary of the Invention

[0004] The purpose of the present invention is to provide a vehicle overheat protection control method, device and system to solve the problem that the friction group is easily burned when the vehicle is used in reverse gear for a long time.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A vehicle overheat protection control method, comprising:

[0007] Obtaining a first temperature of the transfer case and real-time vehicle condition information of the vehicle, and determining whether the first temperature meets a first preset condition;

[0008] determining, based on the gear information of the vehicle, whether the gear of the vehicle is switched from the first gear to the second gear;

[0009] determining a second temperature of the transfer case according to the real-time vehicle condition information;

[0010] When the first gear is switched to the second gear, determining whether the second temperature meets a second preset condition;

[0011] When the first temperature satisfies the first preset condition and the second temperature satisfies the second preset condition, controlling the heat dissipation component in the vehicle to switch from a first working state to a second working state, and controlling the transfer case to switch from an operating state to a torque-off state to dissipate heat from the transfer case;

[0012] When the first temperature does not meet the first preset condition and the second temperature meets the second preset condition, the transfer case is controlled to switch from the working state to the torque disconnection state to dissipate heat from the transfer case.

[0013] Furthermore, obtaining the number of times the transfer case overheats in the current ignition cycle of the vehicle;

[0014] When the first temperature meets a first preset condition, after a corresponding heat dissipation time, the heat dissipation component is controlled to switch from the second working state back to the first working state, and the transfer case is controlled to resume the working state;

[0015] When the first temperature does not meet the first preset condition, the transfer case is controlled to resume working after the heat dissipation time, and the heat dissipation time is determined according to the number of times the transfer case is overheated and the first temperature.

[0016] Furthermore, the first temperature is the internal oil temperature.

[0017] Furthermore, the second temperature is the current friction plate group temperature.

[0018] Furthermore, the real-time vehicle condition information further includes: the current wheel speed of the vehicle, the duration of vehicle shutdown, the outdoor temperature, and the engine output torque. Determining the second temperature of the transfer case based on the real-time vehicle condition information includes:

[0019] The current friction plate group temperature of the transfer case is determined according to the vehicle shutdown duration, the current wheel speed, the outdoor temperature, the current gear position, and the engine output torque.

[0020] Furthermore, the first gear is a forward gear and the second gear is a reverse gear. When the first gear is switched to the second gear, determining whether the second temperature meets a second preset condition includes:

[0021] When switching from forward gear to reverse gear, it is determined whether the current friction plate group temperature is between the first threshold and the second threshold, and whether the current friction plate group temperature meets a third preset condition.

[0022] Furthermore, the heat dissipation component is an engine cooling fan of the vehicle, and the rotational speed of the engine cooling fan when in the second working state is greater than the rotational speed of the engine cooling fan when in the first working state.

[0023] A vehicle overheat protection control device, comprising:

[0024] a first acquisition module, configured to acquire a first temperature of the transfer case and real-time vehicle condition information of the vehicle, and determine whether the first temperature satisfies a first preset condition;

[0025] a first determining module, configured to determine whether the gear of the vehicle is switched from the first gear to the second gear according to the gear information of the vehicle;

[0026] a determination module, configured to determine a second temperature of the transfer case according to the real-time vehicle condition information;

[0027] a second determining module, configured to determine whether the second temperature satisfies a second preset condition when the first gear is switched to the second gear;

[0028] a first control module, configured to control the heat dissipation component in the vehicle to switch from a first operating state to a second operating state, and control the transfer case to switch from an operating state to a torque-off state, to dissipate heat from the transfer case, when the first temperature satisfies the first preset condition and the second temperature satisfies the second preset condition;

[0029] The second control module is configured to control the transfer case to switch from an operating state to a torque disconnect state to dissipate heat from the transfer case when the first temperature does not meet the first preset condition and the second temperature meets the second preset condition.

[0030] Furthermore, the device further comprises:

[0031] A second acquisition module is used to obtain the number of transfer case overheating events in a current ignition cycle of the vehicle;

[0032] a third control module, configured to control the heat dissipation component to switch from the second working state to the first working state and control the transfer case to resume working state when the first temperature meets the first preset condition and after a corresponding heat dissipation time.

[0033] and a fourth control module, configured to control the transfer case to resume operation after the heat dissipation time when the first temperature does not meet the first preset condition, wherein the heat dissipation time is determined based on the number of times the transfer case overheats and the first temperature.

[0034] A vehicle overheating protection control system includes: the vehicle overheating protection control device.

[0035] In summary, due to the adoption of the above technical solution, the vehicle overheating protection control method, device and system of the present invention have the following beneficial effects:

[0036] When the first temperature of the transfer case satisfies a first preset condition, when the current gear is switched from the first gear to the second gear, and when the second temperature of the transfer case satisfies a second preset condition, the heat dissipation component in the vehicle is controlled to switch from the first operating state to the second operating state, and the transfer case is controlled to switch from the operating state to the torque disconnect state to dissipate heat from the transfer case. This can quickly dissipate heat from the transfer case, improve the heat dissipation performance of the entire vehicle, effectively protect the heat dissipation of the powertrain, and prevent ablation of the friction group in the transfer case. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flowchart of a vehicle overheating protection control method according to an embodiment of the present invention;

[0038] Figure 2 This is a flowchart of another vehicle overheating protection control method according to an embodiment of the present invention;

[0039] Figure 3 This is a flow chart of a vehicle overheating protection control method according to an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of a vehicle overheating protection control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Currently, after the wet clutch triggers the overheating alarm, the transfer case's wet friction plate group disconnects torque transmission to dissipate heat. However, due to the drag torque of the wet friction plate, if the vehicle is not stopped and continues to be unstuck and the inter-axle differential is large for a long time, the friction plate group will continue to heat up, and there is still a risk of friction group ablation.

[0043] The existing transfer case friction group is lubricated by an oil pump. However, the oil pump is a one-way rotor pump. When the vehicle is in forward gear (D gear), the oil pump can lubricate the friction group. When in reverse gear (R gear), it can only rely on chain stirring of oil for splash lubrication. The poor lubrication effect can easily cause slow cooling, which in turn causes the vehicle to use R gear for a long time when getting out of trouble. The temperature of the friction group will rise sharply due to poor cooling, resulting in friction group burning.

[0044] In order to overcome the above problems, the present invention proposes a vehicle overheating protection control method to solve the problem that the friction group is easily burned when the vehicle is in reverse gear for a long time.

[0045] Example 1:

[0046] refer to Figure 1 , Figure 1 FIG. 1 is a flow chart of the steps of a vehicle overheat protection control method according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0047] Step 101: Obtain a first temperature of a transfer case and real-time vehicle condition information, and determine whether the first temperature meets a first preset condition.

[0048] The vehicle overheat protection control method provided by the embodiment of the present invention is mainly applied in the control system of a four-wheel drive vehicle, specifically, in a transfer case control unit in the control system of a four-wheel drive vehicle.

[0049] Specifically, the first temperature of the transfer case is the internal oil temperature of the transfer case, which is detected by a temperature sensor. The first temperature of the transfer case is obtained only once. Determining whether the first temperature satisfies a first preset condition is determining whether the internal oil temperature exceeds a set temperature, where the set temperature is 100 degrees Celsius. If the internal oil temperature exceeds the set temperature, it means the detected internal oil temperature is greater than 100 degrees Celsius, i.e., the internal oil temperature satisfies the first preset condition. If the internal oil temperature does not exceed the set temperature, it means the detected internal oil temperature is less than 100 degrees Celsius, i.e., the internal oil temperature does not satisfy the first preset condition.

[0050] The real-time vehicle condition information is acquired and updated in real time, and the real-time acquisition of the real-time vehicle condition information is continuously performed during the inventive vehicle overheating protection control method. Furthermore, in this embodiment, the real-time vehicle condition information also includes the vehicle's current wheel speed, vehicle stall duration, outdoor temperature, and engine output torque. The current wheel speed is monitored by the vehicle's internal electronic stability system, the vehicle stall duration is monitored by the vehicle's internal body controller, the outdoor temperature is monitored by the vehicle's internal air conditioning sensor, and the engine output torque is monitored by the vehicle's transmission control unit.

[0051] Step 102: Determine whether the gear position of the vehicle is switched from the first gear position to the second gear position based on the gear position information of the vehicle.

[0052] Specifically, the gear information is monitored and obtained through the transmission control unit, the first gear is the forward gear, and the second gear is the reverse gear, and it is determined whether the gear of the vehicle is switched from the first gear to the second gear, that is, whether the gear of the vehicle is switched from the forward gear to the reverse gear.

[0053] Step 103: Determine a second temperature of the transfer case according to the real-time vehicle condition information.

[0054] In this embodiment, optionally, the second temperature is the current friction plate group temperature.

[0055] Optionally, the second transfer case temperature may include multiple temperatures used to determine whether the transfer case is overheated, such as the current transfer case friction plate pack temperature, the transfer case housing temperature, and the transfer case internal temperature. The transfer case internal temperature refers to the temperature within the transfer case's internal cavity. The current transfer case friction plate pack temperature is obtained by calculation or measurement, and the transfer case housing temperature and transfer case internal temperature are obtained by measurement.

[0056] Step 104: When the first gear is switched to the second gear, determining whether the second temperature meets a second preset condition.

[0057] Furthermore, when switching from forward gear to reverse gear, if the second temperature meets a second preset condition, it indicates that the transfer case is overheated in reverse gear; if the second temperature does not meet the second preset condition, it indicates that the transfer case is not overheated in reverse gear.

[0058] Step 105: When the first temperature satisfies the first preset condition and the second temperature satisfies the second preset condition, the heat dissipation component in the vehicle is controlled to switch from the first working state to the second working state, and the transfer case is controlled to switch from the working state to the torque disconnection state to dissipate heat from the transfer case.

[0059] Optionally, the heat dissipation component is an engine cooling fan, and the rotational speed of the engine cooling fan in the second operating state is greater than the rotational speed of the engine cooling fan in the first operating state, and the first operating state of the engine cooling fan is the normal operating state of the engine cooling fan. Optionally, the heat dissipation component in the vehicle is controlled to switch from the first operating state to the second operating state, and the transfer case is controlled to switch from the operating state to the torque-disconnected state to dissipate heat from the transfer case. Specifically, the engine cooling fan is controlled to increase its rotational speed to 3000 rpm, and the transfer case is controlled to be in the torque-disconnected state. This allows for more rapid heat dissipation from the transfer case, further improving overall vehicle heat dissipation, effectively protecting powertrain heat dissipation, and preventing erosion of the friction group within the transfer case.

[0060] Step 106: When the first temperature does not satisfy the first preset condition and the second temperature satisfies the second preset condition, controlling the transfer case to switch from the working state to the torque disconnecting state to dissipate heat from the transfer case.

[0061] Optionally, during normal vehicle driving, the transfer case is in an operating state. Specifically, in a torque-disconnected state, the transfer case's internal friction plate group is torque-disconnected, and the chain stirs oil to splash lubricate the friction group, thereby cooling the transfer case, i.e., dissipating heat from the transfer case. Controlling the transfer case to switch from the operating state to the torque-disconnected state refers to controlling the internal friction plate group of the transfer case to be torque-disconnected, and the chain stirs oil to splash lubricate the friction group, thereby cooling the transfer case, thereby dissipating heat from the transfer case.

[0062] Example 2:

[0063] refer to Figure 2 and Figure 3 , Figure 2 FIG. 1 is a flow chart of another vehicle overheating protection control method according to an embodiment of the present invention. Figure 2 As shown, the method includes:

[0064] Step 201: Acquire the internal oil temperature of the transfer case and the real-time vehicle condition information, and determine whether the internal oil temperature meets a first preset condition.

[0065] In this embodiment, determining whether the first temperature satisfies the first preset condition is determining whether the internal oil temperature exceeds a set temperature, where the set temperature is 100 degrees Celsius. When the internal oil temperature exceeds the set temperature, it means that the detected internal oil temperature is greater than 100 degrees Celsius, i.e., the internal oil temperature satisfies the first preset condition. When the internal oil temperature does not exceed the set temperature, it means that the detected internal oil temperature is less than 100 degrees Celsius, i.e., the internal oil temperature does not satisfy the first preset condition.

[0066] The real-time vehicle condition information also includes the vehicle's current wheel speed, vehicle shutdown duration, outdoor temperature, and engine output torque. The current wheel speed is monitored by the vehicle's electronic stability control system, the vehicle shutdown duration is monitored by the vehicle's body controller, the outdoor temperature is monitored by the vehicle's air conditioning sensor, and the engine output torque is monitored by the vehicle's transmission control unit. This real-time vehicle condition information is acquired and updated in real time, and is continuously acquired during the inventive vehicle overheating protection control method.

[0067] Step 202: Determine whether the gear of the vehicle is switched from forward gear to reverse gear based on the gear information of the vehicle.

[0068] Specifically, the gear information is monitored and acquired by a transmission control unit.

[0069] Step 203: Determine the current friction plate group temperature of the transfer case according to the real-time vehicle condition information.

[0070] In this embodiment, the current friction plate group temperature can be calculated based on the current wheel speed, vehicle shutdown time, outdoor temperature, and engine output torque. The current friction plate group temperature represents the current real-time friction plate group temperature.

[0071] Specifically, the current friction plate group temperature is the friction plate group temperature calculated last time plus the friction plate group heat generation minus the friction plate group heat dissipation.

[0072] Optionally, the current friction plate group temperature is obtained by directly monitoring the oil temperature of the friction plate group through a temperature sensor, and inferring the current friction plate group temperature.

[0073] Step 204: Sending a prompt message to the instrument of the vehicle, wherein the prompt message is used to indicate the current friction plate group temperature value.

[0074] In this embodiment, after the current friction plate group temperature is calculated, a prompt message is sent to the vehicle's instrument panel, wherein the prompt message is used to indicate the current friction plate group temperature value. The prompt message is displayed in the form of a dial.

[0075] Specifically, the first threshold, or reverse gear overheat warning value, is 150 degrees Celsius, and the second threshold, or forward gear overheat warning value, is 200 degrees Celsius. On the dial displaying the friction plate pack temperature, temperatures exceeding 200 degrees Celsius are indicated in red, those between 150 and 200 degrees Celsius in orange, and those between 100 and 150 degrees Celsius in yellow. This allows users to clearly understand the current friction plate pack temperature and its criticality, allowing them to anticipate and take preventative measures, reducing the risk of rollovers in extreme off-road vehicles and preventing friction plate pack burnout.

[0076] Step 205: When the forward gear is switched to the reverse gear, it is determined whether the current friction plate group temperature meets a second preset condition.

[0077] Further, including:

[0078] Sub-step 1: When the forward gear is switched to the reverse gear, determine whether the temperature of the friction plate group is between a first threshold and a second threshold.

[0079] The first threshold is the reverse gear overheat warning value, and the second threshold is the forward gear overheat warning value. The first threshold is lower than the second threshold. If the current friction plate group temperature is determined to be between the first and second thresholds, it indicates that the friction group oil temperature has reached the reverse gear overheat warning value but has not reached the forward gear overheat warning value. Specifically, the first threshold, i.e., the reverse gear overheat warning value, is 150 degrees Celsius, and the second threshold, i.e., the forward gear overheat warning value, is 200 degrees Celsius.

[0080] Optionally, if it is determined that the current friction plate group temperature exceeds the second threshold, it means that the transfer case has overheated in the forward gear. At this time, the friction plate group in the transfer case has disconnected the torque. When the vehicle switches from the forward gear to the reverse gear, the friction plate group continues to maintain the torque disconnected state.

[0081] Sub-step 2: If it is determined that the friction plate group temperature is between the first threshold and the second threshold, determine whether the current friction plate group temperature meets the third preset condition, and / or the current wheel speed meets the fourth preset condition.

[0082] The current friction plate group temperature satisfies the third preset condition, which means that the current friction plate group temperature has increased by a corresponding fine-tuning value. Specifically, the fine-tuning value is 5% of the current real-time friction plate group temperature in step S1. That is, after determining that the friction plate group temperature is between the first threshold and the second threshold, the friction plate group temperature is continuously monitored to determine whether the current friction plate group temperature has continued to increase by the corresponding fine-tuning value.

[0083] Specifically, if the current friction plate group temperature, which is between the first and second thresholds in sub-step 1, is 160 degrees Celsius, the fine-tuning value is 160.5%, or 8 degrees Celsius. That is, after determining that 160 degrees Celsius is between 150 and 200 degrees Celsius, the friction plate group temperature rises by 8 degrees Celsius, from 160 degrees Celsius to 168 degrees Celsius, indicating that the current friction plate group temperature meets the third preset condition.

[0084] The current wheel speed satisfies the fourth preset condition, meaning the current wheel speed is greater than a set value. Specifically, the set value for the current wheel speed is 2 km / h. If the current friction plate group temperature, which is between the first and second thresholds, is 160 degrees Celsius, and the rear friction plate group temperature has increased by 2 degrees Celsius, but the current wheel speed at this time exceeds 2 km / h, then the current friction plate group temperature does not satisfy the third preset condition. The current wheel speed satisfies the fourth preset condition, indicating that the current friction plate group temperature satisfies the third preset condition and / or the current wheel speed satisfies the fourth preset condition.

[0085] At this point, the friction plate pack temperature hasn't risen by the fine-tuning value, but the vehicle's tires are already operating, sending a warning message to the vehicle's instrument panel, indicating that the transfer case is overheating. This method can prevent the friction plate pack temperature from rising too quickly when the current wheel speed is too high, resulting in poor heat dissipation within the transfer case. Furthermore, if the current wheel speed exceeds 2 km / h, indicating that the vehicle's tires are already operating when the user is in reverse gear, this will not affect the user's driving experience.

[0086] Specifically, first determine whether the current friction plate group temperature has not increased by the fine-tuning value, and whether the current wheel speed is ≤ the set value. If not, send a reverse gear overheat signal to the vehicle. If so, continue to determine whether the current friction plate group temperature has increased by the fine-tuning value. If the current friction plate group temperature has increased by the fine-tuning value, send a reverse gear overheat signal to the vehicle. If the current friction plate group temperature has not increased by the fine-tuning value, return to continue determining whether the current friction plate group temperature has not increased by the fine-tuning value, and whether the current wheel speed is ≤ the set value.

[0087] Through the above method, referring to the current friction plate group temperature, when the reverse gear overheat warning value is reached but the forward gear overheat warning value is not reached, the vehicle switches from forward gear to reverse gear, and a warning message will not be sent immediately. The warning message will be sent after the friction group oil temperature rises by the corresponding fine-tuning value, so as to improve the user's driving experience and prevent users from complaining that the vehicle tires do not move and the vehicle directly overheats after shifting into reverse gear.

[0088] Sub-step S3: sending a reverse gear overheat signal to the vehicle.

[0089] In this embodiment, when the forward gear is switched to the reverse gear, the friction plate group temperature is between the first threshold value and the second threshold value, and the current friction plate group temperature meets the third preset condition, and / or the current wheel speed meets the fourth preset condition, a reverse gear overheat signal is sent to the vehicle. The reverse gear overheat signal is used to indicate that the transfer case reverse gear is overheating. Specifically, the reverse gear overheat signal displays the information "transfer case reverse gear overheating" and is voice broadcast at the same time to achieve the purpose of reminding customers.

[0090] Optionally, if the current gear of the vehicle is neutral and is switched to reverse gear, after the current friction plate group temperature reaches a first threshold, a reverse gear overheat signal is directly sent to the vehicle to indicate that the transfer case reverse gear is overheated.

[0091] Step 206: When the internal oil temperature meets the first preset condition and the current friction plate group temperature meets the second preset condition, the heat dissipation component in the vehicle is controlled to switch from the first working state to the second working state, and the transfer case is controlled to switch from the working state to the torque disconnection state to dissipate heat from the transfer case.

[0092] Specifically, the internal oil temperature is detected by a temperature sensor. The first temperature meeting a first preset condition means that the internal oil temperature exceeds a set temperature, where the set temperature is 100 degrees Celsius. When the internal oil temperature exceeds the set temperature, it is determined that the internal oil temperature is greater than 100 degrees Celsius. When the internal oil temperature does not exceed the set temperature, it is determined that the internal oil temperature is less than or equal to 100 degrees Celsius.

[0093] When the internal oil temperature satisfies the first preset condition, and the current friction plate group temperature satisfies the second preset condition, the heat dissipation component is controlled to switch from the first working state to the second working state, and the transfer case is controlled to switch from the working state to the torque disconnection state. Furthermore, the heat dissipation component refers to the engine cooling fan, and the engine cooling fan speed in the second working state is 3000 rpm. Controlling the heat dissipation component to switch from the first working state to the second working state means controlling the engine cooling fan to increase the speed, such as increasing the speed to 3000 rpm. Controlling the transfer case to switch from the working state to the torque disconnection state means controlling the torque disconnection of the friction plate group in the transfer case, and the chain stirring oil to splash lubricate the friction group to reduce the temperature.

[0094] Excessively high internal oil temperatures can affect heat dissipation from the friction plate pack, potentially leading to friction plate erosion. This embodiment detects when the internal oil temperature exceeds a set temperature and simultaneously switches the transfer case from operating to torque-disconnected mode while simultaneously increasing the engine cooling fan speed. This further improves vehicle heat dissipation, effectively protecting the powertrain from heat dissipation and preventing friction plate erosion within the transfer case.

[0095] Step 207: When the internal oil temperature does not meet the first preset condition and the current friction plate group temperature meets the second preset condition, control the transfer case to switch from the working state to the torque disconnect state to dissipate heat from the transfer case.

[0096] Furthermore, controlling the transfer case to switch from a working state to a torque disconnection state means controlling the torque disconnection of the friction plate group in the transfer case, and the chain stirring oil to splash lubricate the friction group, cool it down, and dissipate heat from the transfer case.

[0097] Step 208: Obtain the number of transfer case overheating events in the current ignition cycle of the vehicle.

[0098] In this embodiment, the current ignition cycle of the vehicle is defined as the period from the vehicle's ignition on to the vehicle's shutdown. Specifically, the vehicle control system can identify ignition signals and shutdown signals. When the current friction plate group temperature satisfies a second preset condition, an overheat is counted. When the current friction plate group temperature drops below the first threshold and then satisfies the second preset condition a certain period of time later, another overheat is counted. The number of transfer case overheats is calculated based on the aforementioned rules.

[0099] Step 209: When the internal oil temperature meets the first preset condition, after a corresponding heat dissipation time, control the heat dissipation component to switch from the second working state back to the first working state, and control the transfer case to resume the working state.

[0100] If it is determined in step 201 that the internal oil temperature meets the first preset condition, then after a corresponding cooling period, the heat dissipation component is controlled to switch from the second operating state back to the first operating state, and the transfer case is controlled to resume operation. Controlling the heat dissipation component to switch from the second operating state back to the first operating state involves controlling the engine cooling fan speed to decrease until it reaches the speed corresponding to the engine cooling fan in the first operating state. Controlling the transfer case to resume operation involves controlling the torque connection of the friction plate pack within the transfer case.

[0101] Step 210: When the internal oil temperature does not meet the first preset condition, the transfer case is controlled to resume working after the heat dissipation time, wherein the heat dissipation time is determined based on the number of times the transfer case is overheated and the internal oil temperature.

[0102] When it is determined in step 201 that the internal oil temperature does not meet the first preset condition, the transfer case is controlled to resume working after a heat dissipation time, where the heat dissipation time is determined based on the number of overheating times of the transfer case and the internal oil temperature.

[0103] Specifically, the corresponding relationship between the heat dissipation time (unit: seconds), the number of transfer case overheating times, and the internal oil temperature is shown in Table 1:

[0104] Table 1 Corresponding relationship between heat dissipation time

[0105]

[0106] Table 1 shows that when the internal oil temperature is ≤100°C and the transfer case overheats three times (i.e., the third time the transfer case overheats), the corresponding cooling time is 180 seconds. Different cooling time gradients are determined based on the internal oil temperature and the number of transfer case overheats. The higher the internal oil temperature and the more transfer case overheats, the longer the cooling time. This allows for more thorough cooling of the transfer case in reverse gear, preventing friction group erosion within the transfer case and improving four-wheel drive reliability.

[0107] If the internal oil temperature is greater than 100°C, the corresponding heat dissipation time is longer than the heat dissipation time when the internal oil temperature is ≤ 100°C, and the internal oil temperature is greater than 100°C.

[0108] Step 211: Determine whether the transfer case meets the heat dissipation requirement based on the current friction plate group temperature.

[0109] In this embodiment, whether the transfer case has met its cooling requirements is determined based on the current friction plate group temperature. Specifically, whether the current friction plate group temperature is less than a first threshold is determined. If so, the transfer case has met its cooling requirements, and step 201 is executed again. Because the cooling duration is selected based on the correspondence table in Table 1, under normal circumstances, when the transfer case is in the torque-off state and the engine cooling fan is in the second operating state, the transfer case will meet its cooling requirements after the corresponding cooling duration in Table 1 continues.

[0110] If the current friction plate group temperature is still higher than the first threshold, the transfer case is switched back to the torque disconnect state for a set time, where the set time is determined based on the difference between the current friction plate group temperature and the first threshold.

[0111] Based on the same inventive concept, the present invention proposes a cold start device for a diesel engine, referring to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a vehicle overheat protection control device according to an embodiment of the present invention. Figure 4 As shown, the device includes:

[0112] A first acquisition module 301 is configured to acquire a first temperature of the transfer case and real-time vehicle condition information of the vehicle, and determine whether the first temperature satisfies a first preset condition;

[0113] A first determining module 302 is configured to determine whether the gear of the vehicle is switched from the first gear to the second gear based on the gear information of the vehicle;

[0114] a determination module 303, configured to determine a second temperature of the transfer case according to the real-time vehicle condition information;

[0115] A second determining module 304 is configured to determine whether the second temperature satisfies a second preset condition when the first gear is switched to the second gear;

[0116] a first control module 305 configured to control the heat dissipation component in the vehicle to switch from a first operating state to a second operating state, and control the transfer case to switch from an operating state to a torque-off state, to dissipate heat from the transfer case, when the first temperature satisfies a first preset condition and the second temperature satisfies a second preset condition;

[0117] The second control module 306 is configured to control the transfer case to switch from the working state to the torque disconnecting state to dissipate heat from the transfer case when the first temperature does not satisfy the first preset condition and the second temperature satisfies the second preset condition.

[0118] Furthermore, the device further comprises:

[0119] A second acquisition module is used to obtain the number of transfer case overheating events in a current ignition cycle of the vehicle;

[0120] a third control module, configured to control the heat dissipation component to switch from the second working state to the first working state and control the transfer case to resume working state when the first temperature meets a first preset condition and after a corresponding heat dissipation time.

[0121] and a fourth control module, configured to control the transfer case to resume operation after a heat dissipation period when the first temperature does not satisfy a first preset condition, wherein the heat dissipation period is determined based on the number of overheating times of the transfer case and the oil temperature of the transfer case.

[0122] a sending module, configured to send a prompt message to a meter of the vehicle, wherein the prompt message is used to indicate the current temperature value of the friction plate group;

[0123] The third judgment module is configured to judge whether the transfer case meets the heat dissipation requirement based on the current friction plate group temperature.

[0124] Specifically, the current temperature of the transfer case of the vehicle includes the current temperature of the friction plate group of the transfer case of the vehicle. The real-time vehicle condition information also includes: the current wheel speed of the vehicle, the duration of vehicle shutdown, the outdoor temperature, and the engine output torque. The determination module 303 includes:

[0125] The first determining unit is configured to determine a current friction plate group temperature of the transfer case of the vehicle according to the vehicle shutdown duration, the current wheel speed, the outdoor temperature, the current gear, and the engine output torque.

[0126] Furthermore, the second judgment module 304 is configured to judge whether the current friction plate group temperature is between the first threshold and the second threshold when the current forward gear is switched to the reverse gear, and judge whether the current friction plate group temperature meets the third preset condition.

[0127] An embodiment of the present invention further provides a system, which includes the vehicle overheating protection control device.

[0128] An embodiment of the present invention further provides an electronic device, including:

[0129] processor;

[0130] A memory storing instructions thereon, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the device executes a vehicle overheating protection control method.

[0131] The present invention also provides a non-temporary computer-readable storage medium, which stores a computer program. When the computer program in the storage medium is executed by a processor of an electronic device, the electronic device is able to execute the vehicle overheating protection control method.

[0132] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0133] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0134] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

Claims

1. A vehicle overheat protection control method, characterized in that: include: Obtaining a first temperature of the transfer case and real-time vehicle condition information, and determining whether the first temperature satisfies a first preset condition; wherein the first temperature is an internal oil temperature; and determining whether the first temperature satisfies the first preset condition is determining whether the internal oil temperature exceeds a set temperature; determining, based on the gear information of the vehicle, whether the gear of the vehicle is switched from the first gear to the second gear; Determining a second temperature of the transfer case according to the real-time vehicle condition information; wherein the second temperature is a current friction plate group temperature; When the first gear is switched to the second gear, determining whether the second temperature meets a second preset condition; When the first temperature satisfies the first preset condition and the second temperature satisfies the second preset condition, controlling the heat dissipation component in the vehicle to switch from a first working state to a second working state, and controlling the transfer case to switch from a working state to a torque-disconnected state, to dissipate heat from the transfer case; wherein the first working state of the heat dissipation component is a normal working state, and the speed of the heat dissipation component in the second working state is greater than the speed in the first working state; When the first temperature does not meet the first preset condition and the second temperature meets the second preset condition, controlling the transfer case to switch from a working state to a torque disconnection state to dissipate heat from the transfer case; Among them, the first gear is a forward gear or a neutral gear, and the second gear is a reverse gear; when the first gear is switched to the second gear, whether the second temperature meets the second preset condition is judged, including: when the forward gear is switched to the reverse gear, whether the current friction plate group temperature is between the first threshold and the second threshold, and whether the current friction plate group temperature meets the third preset condition; when the neutral gear is switched to the reverse gear, whether the current friction plate group temperature reaches the first threshold.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining the number of transfer case overheating times in a current ignition cycle of the vehicle; When the first temperature meets a first preset condition, after a corresponding heat dissipation time, the heat dissipation component is controlled to switch from the second working state back to the first working state, and the transfer case is controlled to resume the working state; When the first temperature does not meet the first preset condition, the transfer case is controlled to resume working after the heat dissipation time, and the heat dissipation time is determined according to the number of times the transfer case is overheated and the first temperature.

3. The method according to claim 1, characterized in that The real-time vehicle condition information further includes: the current wheel speed of the vehicle, the duration of vehicle shutdown, the outdoor temperature, and the engine output torque. Determining the second temperature of the transfer case based on the real-time vehicle condition information includes: The current friction plate group temperature of the transfer case is determined according to the vehicle shutdown duration, the current wheel speed, the outdoor temperature, the current gear position, and the engine output torque.

4. The method according to claim 1, wherein The heat dissipation component is an engine cooling fan of the vehicle, and the rotational speed of the engine cooling fan when in the second working state is greater than the rotational speed of the engine cooling fan when in the first working state.

5. A vehicle overheat protection control device, characterized in that: include: a first acquisition module, configured to acquire a first temperature of the transfer case and real-time vehicle condition information, and determine whether the first temperature satisfies a first preset condition; wherein the first temperature is an internal oil temperature; and determining whether the first temperature satisfies the first preset condition is determining whether the internal oil temperature exceeds a set temperature; a first determining module, configured to determine whether the gear of the vehicle is switched from the first gear to the second gear according to the gear information of the vehicle; a determination module, configured to determine a second temperature of the transfer case according to the real-time vehicle condition information; wherein the second temperature is a current friction plate group temperature; a second determining module, configured to determine whether the second temperature satisfies a second preset condition when the first gear is switched to the second gear; a first control module, configured to control the heat dissipation component in the vehicle to switch from a first operating state to a second operating state, and control the transfer case to switch from an operating state to a torque-off state, to dissipate heat from the transfer case, when the first temperature satisfies the first preset condition and the second temperature satisfies the second preset condition; wherein the first operating state of the heat dissipation component is a normal operating state, and a rotational speed of the heat dissipation component in the second operating state is greater than a rotational speed in the first operating state; a second control module, configured to control the transfer case to switch from an operating state to a torque-off state to dissipate heat from the transfer case when the first temperature does not satisfy the first preset condition and when the second temperature satisfies the second preset condition; Among them, the first gear is a forward gear or a neutral gear, and the second gear is a reverse gear. When the first gear is switched to the second gear, whether the second temperature meets the second preset condition is judged, including: when the forward gear is switched to the reverse gear, whether the current friction plate group temperature is between the first threshold and the second threshold, and whether the current friction plate group temperature meets the third preset condition; when the neutral gear is switched to the reverse gear, whether the current friction plate group temperature reaches the first threshold.

6. The device according to claim 5, characterized in that The device further comprises: A second acquisition module is used to obtain the number of transfer case overheating events in a current ignition cycle of the vehicle; a third control module, configured to control the heat dissipation component to switch from the second working state to the first working state and control the transfer case to resume working state when the first temperature meets the first preset condition and after a corresponding heat dissipation time. and a fourth control module, configured to control the transfer case to resume operation after the heat dissipation time when the first temperature does not meet the first preset condition, wherein the heat dissipation time is determined based on the number of times the transfer case overheats and the first temperature.

7. A vehicle overheat protection control system, characterized in that: include: The vehicle overheat protection control device according to any one of claims 5 or 6.

Images