Vehicle control method, system and vehicle

Abstract

The application discloses a vehicle control method, system and vehicle, determines the current gear and the current friction plate temperature of the vehicle, determines the matched target overheating alarm strategy as the forward gear overheating alarm strategy or the reverse gear overheating alarm strategy according to whether the current gear is the forward gear or the reverse gear and the size of the current friction plate temperature, and executes the target overheating alarm strategy. The application sets the corresponding overheating alarm strategies for the forward gear and the reverse gear respectively, and the reverse gear overheating alarm prompt value in the reverse gear overheating alarm strategy is smaller than the forward gear overheating alarm prompt value in the forward gear overheating alarm strategy. Since the value of the reverse gear overheating alarm prompt value is determined based on the friction plate ablation temperature critical value, when the vehicle is in the reverse gear and the friction plate temperature rises to the reverse gear overheating alarm prompt value, the friction plate ablation condition does not occur, and the purpose of the friction plate overheating alarm is achieved.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and more particularly to a vehicle control method, system and vehicle. Background Art

[0002] A four-wheel drive system, also known as an all-wheel drive system, means that both the front and rear wheels of a vehicle are powered, and the engine output torque can be distributed to all the front and rear wheels in different proportions according to the different road conditions to improve the vehicle's driving ability. During vehicle driving, some road conditions require four-wheel drive, such as driving on slippery, icy, and uneven roads, or when the wheels are stuck in a mud pit and slipping, or when climbing a slope. The vehicle requires a larger driving force, and both the front and rear wheels need to be powered to improve the vehicle's driving performance. The transfer case is an important transmission component in four-wheel drive vehicles. It outputs the transmission input torque to the front and rear axles to achieve the vehicle's four-wheel drive function. Specifically, the transfer case achieves the four-wheel drive function by compressing the internal friction plates. However, due to the limited torque capacity of the friction plates, the vehicle may experience friction plate overheating when driving in four-wheel drive on unpaved roads.

[0003] In the prior art, an overheat alarm is triggered when the friction plate temperature reaches 200°C. However, when the vehicle is in reverse gear, due to the limited location of the reverse gear oil pump, the oil cannot lubricate the friction plate when the friction plate temperature rises to 200°C. This results in a lack of gear oil medium in the friction plate, causing friction plate burn, thus defeating the purpose of the friction plate overheat alarm. Summary of the Invention

[0004] In view of this, the present invention discloses a vehicle control method, system and vehicle to eliminate the problem of friction plate ablation and achieve the purpose of friction plate overheating alarm.

[0005] A vehicle control method, comprising:

[0006] Determine the vehicle's current gear and current friction plate temperature;

[0007] Determining a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature;

[0008] executing the target overheat alarm strategy;

[0009] Among them, the target overheating alarm strategy is: forward gear overheating alarm strategy or reverse gear overheating alarm strategy, the forward gear overheating alarm prompt value in the forward gear overheating alarm strategy is greater than the reverse gear overheating alarm prompt value in the reverse gear overheating alarm strategy, and the value of the reverse gear overheating alarm prompt value is determined based on the friction plate ablation temperature critical value.

[0010] Optionally, determining a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature includes:

[0011] When the current gear is the forward gear, determining whether the current friction plate temperature exceeds the reverse gear overheat alarm prompt value and does not reach the forward gear overheat alarm prompt value;

[0012] If yes, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear.

[0013] Optionally, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear includes:

[0014] When the first gear switching instruction from the forward gear to the reverse gear is not received, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0015] Optionally, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear includes:

[0016] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0017] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0018] When the absolute value of the first difference is smaller than the first preset speed difference, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0019] Optionally, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear includes:

[0020] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0021] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0022] In a case where the first difference absolute value is not less than a first preset rotation speed difference value, a first duration in which the first difference absolute value is not less than the first preset rotation speed difference value is obtained;

[0023] When the first duration reaches the first duration threshold, it is determined that the target overheating alarm strategy is the reverse gear overheating alarm strategy.

[0024] Optionally, the determining the target overheating alarm strategy according to whether the current gear is switched from the reverse gear to the forward gear comprises:

[0025] In a case where the current gear is the reverse gear, if the current friction plate temperature exceeds the reverse gear overheating alarm prompt value, the control instrument prompts the friction plate overheating alarm information;

[0026] According to whether the current gear is switched from the reverse gear to the forward gear, the target overheating alarm strategy is determined to be the forward gear overheating alarm strategy or the reverse gear overheating alarm strategy.

[0027] Optionally, the determining the target overheating alarm strategy according to whether the current gear is switched from the reverse gear to the forward gear comprises:

[0028] When a second gear switching instruction of switching from the reverse gear to the forward gear is received, the current gear is switched to the forward gear;

[0029] A second difference absolute value between a front axle rotation speed of the vehicle and a rear axle rotation speed of the vehicle is determined.

[0030] In a case where the second difference absolute value is not less than a second preset rotation speed difference value, a second duration in which the second difference absolute value is not less than the second preset rotation speed difference value is obtained;

[0031] When the second duration does not reach a second duration threshold, it is determined that the target overheating alarm strategy is the reverse gear overheating alarm strategy.

[0032] Optionally, the determining the target overheating alarm strategy according to whether the current gear is switched from the reverse gear to the forward gear comprises:

[0033] When a second gear switching instruction of switching from the reverse gear to the forward gear is received, the current gear is switched to the forward gear;

[0034] A second difference absolute value between a front axle rotation speed of the vehicle and a rear axle rotation speed of the vehicle is determined.

[0035] When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference;

[0036] When the second duration reaches a second duration threshold, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0037] A vehicle control device, comprising:

[0038] An initial parameter determination unit, used to determine the current gear position and current friction plate temperature of the vehicle;

[0039] an alarm strategy determination unit, which determines a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and the current friction plate temperature;

[0040] an alarm strategy execution unit, configured to execute the target overheat alarm strategy;

[0041] Among them, the target overheating alarm strategy is: forward gear overheating alarm strategy or reverse gear overheating alarm strategy, the forward gear overheating alarm prompt value in the forward gear overheating alarm strategy is greater than the reverse gear overheating alarm prompt value in the reverse gear overheating alarm strategy, and the value of the reverse gear overheating alarm prompt value is determined based on the friction plate ablation temperature critical value.

[0042] A vehicle includes a controller, the controller including a memory and a processor;

[0043] The memory is used to store at least one instruction;

[0044] The processor is configured to execute the at least one instruction to implement the vehicle control method described above.

[0045] As can be seen from the above technical solutions, the present invention discloses a vehicle control method, system and vehicle, which determine the current gear position and current friction plate temperature of the vehicle, and determine the matching target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy based on whether the current gear position is the forward gear or the reverse gear, and in combination with the current friction plate temperature, and execute the target overheat alarm strategy. The present invention sets corresponding overheat alarm strategies for the forward gear and the reverse gear respectively, and the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy is less than the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy. Since the value of the reverse gear overheat alarm prompt value is determined based on the friction plate ablation temperature critical value, when the vehicle is in reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate ablation will not occur, thereby achieving the purpose of the friction plate overheat alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0047] Figure 1 A flow chart of a vehicle control method disclosed in an embodiment of the present invention;

[0048] Figure 2 A schematic structural diagram of a vehicle control device disclosed in an embodiment of the present invention;

[0049] Figure 3 The present invention is a schematic structural diagram of a controller in a vehicle disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In the prior art, an overheat alarm is typically triggered when the friction plate temperature reaches the overheat warning threshold of 200°C, and the alarm is cleared when the friction plate temperature drops to the clearing threshold of 160°C. When the vehicle is in reverse gear (R), the reverse gear oil pump is restricted, preventing oil from reaching the friction plate. As a result, when the friction plate temperature rises to 200°C, the friction plate lacks gear oil, leading to friction plate ablation and defeating the purpose of the friction plate overheat alarm.

[0051] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] The embodiment of the present invention discloses a vehicle control method, system and vehicle, which determine the current gear position and current friction plate temperature of the vehicle, and determine the matching target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy based on whether the current gear position is the forward gear or the reverse gear, and in combination with the magnitude of the current friction plate temperature, and execute the target overheat alarm strategy. The present invention sets corresponding overheat alarm strategies for the forward gear and the reverse gear respectively, and the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy is smaller than the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy. Since the reverse gear overheat alarm prompt value is determined based on the friction plate ablation temperature critical value, when the vehicle is in the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate ablation will not occur, thereby achieving the purpose of the friction plate overheat alarm.

[0053] See also Figure 1 , a flow chart of a vehicle control method disclosed in an embodiment of the present invention, the method comprising:

[0054] Step S101: Determine the current gear position and current friction plate temperature of the vehicle.

[0055] The friction plate generates a significant amount of heat during friction, causing its temperature to rise rapidly, potentially exceeding 200°C. In such high-temperature environments, traditional temperature sensors may not function properly or their measurement accuracy may be affected. Furthermore, direct contact and friction between the friction plate and its mating components (such as the brake drum and clutch pressure plate) not only complicates temperature sensor installation but can also damage it due to wear. Therefore, the friction plate temperature is not directly measured using a temperature sensor, but is calculated based on parameters such as the amount and duration of slip on the vehicle's front and rear axles.

[0056] Step S102: Determine a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature.

[0057] In order to solve the problem that when the overheat alarm prompt value is set according to the forward gear, the position of the reverse gear oil pump is limited and the oil cannot lubricate the friction plate, resulting in the friction plate temperature in the reverse gear not rising to the overheat alarm prompt value, and the friction plate is burned due to the lack of gear oil medium, thus making it impossible to issue a friction plate overheat alarm, this application sets a forward gear overheat alarm strategy for the forward gear (such as D gear), and sets a reverse gear overheat alarm strategy for the reverse gear (R gear).

[0058] In the forward gear overheat alarm strategy, if the current friction plate temperature exceeds the forward gear overheat alarm prompt value, the overheat alarm is triggered; if the current friction plate temperature drops to the forward gear overheat alarm elimination prompt value, the overheat alarm is eliminated.

[0059] In the reverse gear overheat alarm strategy, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the overheat alarm is triggered; if the current friction plate temperature drops to the reverse gear overheat alarm prompt value, the overheat alarm is eliminated.

[0060] Among them, the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy, and the forward gear overheat elimination alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat elimination alarm prompt value in the reverse gear overheat alarm strategy.

[0061] It should be noted that the value of the reverse gear overheating alarm prompt value is determined based on the critical value of the friction plate ablation temperature, so as to avoid the situation where the friction plate temperature rises to the reverse gear overheating alarm prompt value, resulting in the friction plate ablation due to the lack of gear oil medium.

[0062] For examples, see Table 1.

[0063] Gear Name Overheat alarm value Eliminate overheating alarm prompt value forward gear 200℃ 160℃ Reverse gear 160℃ 120℃

[0064] In actual applications, the specific values ​​of the forward gear overheat alarm prompt value, the reverse gear overheat alarm prompt value, the forward gear overheat elimination alarm prompt value and the reverse gear overheat elimination alarm prompt value are determined according to actual needs, but it is necessary to ensure that the forward gear overheat alarm prompt value is greater than the reverse gear overheat alarm prompt value, the forward gear overheat alarm prompt value is greater than the forward gear overheat elimination alarm prompt value, and the reverse gear overheat alarm prompt value is greater than the reverse gear overheat elimination alarm prompt value.

[0065] Among them, in order to improve the accuracy of vehicle control, in addition to considering whether the current gear of the vehicle is forward gear or reverse gear, this application also combines the current friction plate temperature to determine whether the matching target overheating alarm strategy is the forward gear overheating alarm strategy or the reverse gear overheating alarm strategy.

[0066] Step S103: executing the target overheat alarm strategy.

[0067] In summary, the present invention discloses a vehicle control method, which determines the current gear position and current friction plate temperature of the vehicle, and determines the matching target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear position is the forward gear or the reverse gear, and in combination with the magnitude of the current friction plate temperature, and executes the target overheat alarm strategy. The present invention sets corresponding overheat alarm strategies for the forward gear and the reverse gear respectively, and the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy is smaller than the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy. Since the reverse gear overheat alarm prompt value is determined based on the friction plate ablation temperature critical value, when the vehicle is in the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate ablation will not occur, thereby achieving the purpose of the friction plate overheat alarm.

[0068] In one embodiment, step S102 may specifically include:

[0069] (1) When the current gear is the forward gear, determine whether the current friction plate temperature exceeds the reverse gear overheat alarm prompt value and does not reach the forward gear overheat alarm prompt value.

[0070] This application determines whether the vehicle's operating condition allows for gear switching by judging whether the current friction plate temperature exceeds the reverse gear overheat alarm prompt value and has not reached the forward gear overheat alarm prompt value.

[0071] (2) If yes, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear.

[0072] Taking the reverse gear overheating alarm prompt value of 160℃ and the forward gear overheating alarm prompt value of 200℃ as an example, when the vehicle's current gear is the forward gear, if the vehicle's current friction plate temperature exceeds 160℃ and does not reach 200℃, it indicates that the vehicle's operating conditions can achieve gear switching at this time. Based on this, the present application further determines whether to switch the current gear from the forward gear to the reverse gear, that is, the present application further determines whether a gear switching instruction is received, so as to finally determine whether the target overheating alarm strategy is the forward gear overheating alarm strategy or the reverse gear overheating alarm strategy.

[0073] In one embodiment, the process of determining whether the target overheat warning strategy is the forward gear overheat warning strategy or the reverse gear overheat warning strategy based on whether the current gear is switched from the forward gear to the reverse gear may specifically include:

[0074] When the first gear switching instruction from the forward gear to the reverse gear is not received, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0075] When the current gear is the forward gear, although the vehicle's working condition allows for gear switching, when the vehicle has not received the first gear switching command from the forward gear to the reverse gear, it indicates that the vehicle does not need to shift into the reverse gear. At this time, the target overheating alarm strategy is determined to be the forward gear overheating alarm strategy, and the forward gear overheating alarm strategy is executed. The forward gear overheating alarm strategy is specifically: if the current friction plate temperature exceeds the forward gear overheating alarm prompt value, the overheating alarm is triggered; if the current friction plate temperature drops to the forward gear elimination overheating alarm prompt value, the overheating alarm is eliminated.

[0076] In one embodiment, determining the target overheat warning strategy as the forward gear overheat warning strategy or the reverse gear overheat warning strategy based on whether the current gear is switched from the forward gear to the reverse gear includes:

[0077] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0078] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0079] When the absolute value of the first difference is smaller than the first preset speed difference, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0080] In this application, if the current gear is forward and the current friction plate temperature exceeds the reverse gear overheat warning threshold but does not reach the forward gear overheat warning threshold, a determination is made as to whether the vehicle's operating conditions allow for a gear shift. In this case, upon receiving a first gear shift command from forward to reverse, the current gear is directly shifted to reverse. Under normal circumstances, when the vehicle is in reverse, a certain speed difference is permitted between the front and rear axles to accommodate cornering and driving on varying road conditions. If the absolute value of the first speed difference between the front and rear axle speeds is less than a first preset speed difference, indicating that the vehicle failed to fully enter reverse during the reverse gear shift, the forward gear overheat warning strategy is still implemented.

[0081] Among them, the first preset speed difference is: under normal circumstances, when the vehicle is in reverse gear, the maximum speed difference allowed between the front axle and the rear axle of the vehicle is allowed to exist, and the first preset speed difference is a value not less than 0, for example, the first preset speed difference is 50rpm.

[0082] Taking the reverse gear overheating alarm prompt value as 160°C, the forward gear overheating alarm prompt value as 200°C, and the first preset speed difference as 50rpm as an example, when the vehicle's current gear is the forward gear, if the vehicle's current friction plate temperature exceeds 160°C and does not reach 200°C, it indicates that the vehicle's operating conditions can achieve gear switching at this time. When the first gear switching instruction is received, the vehicle's current gear is switched to the reverse gear. When the absolute value of the first difference between the vehicle's front axle speed and the vehicle's rear axle speed is less than 50rpm, it indicates that the vehicle failed to fully enter the reverse state during the process of shifting into the reverse gear. At this time, it is determined that the target overheating alarm strategy is still the forward gear overheating alarm strategy, and the forward gear overheating alarm strategy is executed.

[0083] In one embodiment, determining the target overheat warning strategy as the forward gear overheat warning strategy or the reverse gear overheat warning strategy based on whether the current gear is switched from the forward gear to the reverse gear includes:

[0084] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0085] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0086] When the absolute value of the first difference is not less than a first preset speed difference, obtaining a first duration during which the absolute value of the first difference is not less than the first preset speed difference;

[0087] When the first duration reaches the first duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

[0088] In this application, if the current gear is a forward gear and the current friction plate temperature exceeds the reverse gear overheat alarm threshold but does not reach the forward gear overheat alarm threshold, a determination is made as to whether the vehicle's operating conditions allow for a gear shift. In this case, upon receiving a first gear shift command from forward to reverse, the current gear is directly shifted to reverse. When the absolute value of a first difference between the vehicle's front axle speed and the vehicle's rear axle speed is not less than a first preset speed difference, further determination is made as to whether a first duration during which the absolute value of the first difference is not less than the first preset speed difference reaches a first duration threshold to determine whether the vehicle has fully entered reverse. When the first duration reaches the first duration threshold, the vehicle is determined to have fully entered reverse. The target overheat alarm strategy is then determined to be the reverse gear overheat alarm strategy, and the reverse gear overheat alarm strategy is executed. The reverse gear overheat alarm strategy is as follows: if the current friction plate temperature exceeds the reverse gear overheat alarm threshold, an overheat alarm is triggered; if the current friction plate temperature drops to the reverse gear overheat alarm threshold, the overheat alarm is eliminated.

[0089] The value of the first duration threshold is determined according to actual needs, for example, 5s.

[0090] Taking the reverse gear overheating alarm prompt value as 160°C, the forward gear overheating alarm prompt value as 200°C, the first preset speed difference as 50rpm, and the first duration threshold as 5s as an example, when the vehicle's current gear is the forward gear, if the vehicle's current friction plate temperature exceeds 160°C and does not reach 200°C, it indicates that the vehicle's operating conditions can achieve gear switching at this time. When the first gear switching instruction is received, the vehicle's current gear is switched to the reverse gear. When the absolute value of the first difference between the vehicle's front axle speed and the vehicle's rear axle speed is not less than 50rpm, and the absolute value of the first difference is not less than the first preset speed difference when the first duration is greater than or equal to 5s, it is determined that the vehicle has completely entered the reverse state. At this time, the target overheating alarm strategy is determined to be the reverse gear overheating alarm strategy, and the reverse gear overheating alarm strategy is executed.

[0091] In one embodiment, step S102 may specifically include:

[0092] (1) When the current gear is the reverse gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the control instrument prompts a friction plate overheat alarm message.

[0093] (2) According to whether the current gear is switched from the reverse gear to the forward gear, determining whether the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy.

[0094] Taking the reverse gear overheat alarm value of 160°C as an example, when the vehicle is in reverse gear, if the current friction plate temperature exceeds 160°C, the instrument panel will immediately prompt a friction plate overheat alarm message. This application further determines whether the current gear is switched from reverse gear to forward gear, that is, whether the gear switch command is received, to ultimately determine whether the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy.

[0095] In one embodiment, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy based on whether the current gear is switched from the reverse gear to the forward gear includes:

[0096] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0097] determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0098] When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference;

[0099] When the second duration does not reach a second duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

[0100] If the vehicle is currently in reverse gear and the current friction plate temperature exceeds the reverse gear overheat warning threshold, causing the instrument panel to indicate a friction plate overheat warning message, the vehicle will be switched to forward gear upon receiving a second gear shift command. Under normal circumstances, when the vehicle is in reverse gear, a certain speed difference between the front and rear axles is permitted to accommodate cornering or driving on varying road conditions. If the absolute value of a first difference between the front and rear axle speeds is not less than a second preset speed difference, and if the second duration for which the absolute value of the second difference is not less than the second preset speed difference does not reach a second duration threshold, indicating that the vehicle has not fully entered forward motion, the target overheat warning strategy is determined to remain the reverse gear overheat warning strategy.

[0101] Under normal circumstances, when the vehicle is in a forward gear, the maximum speed difference allowed between the front axle and the rear axle of the vehicle is greater than 0, and the second preset speed difference is, for example, 50 rpm. The absolute value of the second difference is determined based on actual needs and is not limited herein. The second duration threshold is determined based on actual needs, for example, 5 seconds, and is not limited herein.

[0102] For example, if the reverse gear overheat alarm value is 160°C, the second preset speed difference is 50 rpm, and the second duration threshold is 5 seconds, when the vehicle is in reverse gear, if the current friction plate temperature exceeds 160°C, the instrument panel will immediately display a friction plate overheat alarm. Upon receiving a second gear shift command, the vehicle's current gear is switched to forward gear. If the absolute value of the second difference between the vehicle's front axle speed and the vehicle's rear axle speed is greater than or equal to 50 rpm, and the absolute value of the second difference is not less than the second preset speed difference for a duration of less than 5 seconds, it is determined that the vehicle has not fully entered forward gear. At this point, the target overheat alarm strategy is determined to remain the reverse gear overheat alarm strategy.

[0103] In one embodiment, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy based on whether the current gear is switched from the reverse gear to the forward gear includes:

[0104] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0105] determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0106] When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference;

[0107] When the second duration reaches a second duration threshold, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0108] When the vehicle is currently in reverse gear and the current friction plate temperature exceeds the reverse gear overheat alarm threshold, causing the instrument panel to indicate a friction plate overheat alarm, if a second gear shift command is received, the vehicle's current gear is switched to forward gear. Under normal circumstances, when the vehicle is in reverse gear, a certain speed difference is permitted between the front and rear axles to accommodate cornering and driving on varying road conditions. When the absolute value of a first difference between the front and rear axle speeds is no less than a second preset speed difference, and if the second duration for which the absolute value of the second difference is no less than the second preset speed difference reaches a second duration threshold, indicating that the vehicle has fully entered forward motion, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0109] For example, if the reverse gear overheat alarm value is 160°C, the second preset speed difference is 50 rpm, and the second duration threshold is 5 seconds, when the vehicle is in reverse gear and the current friction plate temperature exceeds 160°C, the instrument panel will immediately display a friction plate overheat alarm. Upon receiving a second gear shift command, the vehicle's current gear is switched to forward gear. If the absolute value of the second difference between the vehicle's front axle speed and the vehicle's rear axle speed is greater than or equal to 50 rpm, and the absolute value of the second difference is not less than the second duration threshold of the second preset speed difference for at least 5 seconds, the vehicle is determined to have fully entered forward gear. At this point, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0110] In summary, the present application sets a strategy based on the reverse gear overheat alarm prompt value, the forward gear overheat alarm prompt value, the absolute value of the difference between the vehicle's front axle speed and the vehicle's rear axle speed, and the duration of the absolute value of the difference when switching between the forward gear and the reverse gear, to ensure that the final target overheat alarm strategy is determined when the vehicle fully enters the switched gear, thereby effectively avoiding the problem of false overheat alarm caused by the error between the calculated friction plate temperature and the actual friction plate temperature.

[0111] Corresponding to the above method embodiment, the present invention also discloses a vehicle control device.

[0112] See also Figure 2 , a schematic structural diagram of a vehicle control device disclosed in an embodiment of the present invention, the device may include:

[0113] The initial parameter determination unit 201 is used to determine the current gear position and current friction plate temperature of the vehicle.

[0114] The friction plate generates a significant amount of heat during friction, causing its temperature to rise rapidly, potentially exceeding 200°C. In such high-temperature environments, traditional temperature sensors may not function properly or their measurement accuracy may be affected. Furthermore, direct contact and friction between the friction plate and its mating components (such as the brake drum and clutch pressure plate) not only complicates temperature sensor installation but can also damage it due to wear. Therefore, the friction plate temperature is not directly measured using a temperature sensor, but is calculated based on parameters such as the amount and duration of slip on the vehicle's front and rear axles.

[0115] The alarm strategy determination unit 202 determines a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and the current friction plate temperature.

[0116] In order to solve the problem that when the overheat alarm prompt value is set according to the forward gear, the position of the reverse gear oil pump is limited, and the oil cannot lubricate the friction plate. As a result, when the temperature of the gear friction plate rises to the overheat alarm prompt value, the friction plate has no gear oil medium, which causes the friction plate to burn and does not reach the friction plate overheat alarm value, this application sets a forward gear overheat alarm strategy for the forward gear (such as D gear), and sets a reverse gear overheat alarm strategy for the reverse gear (R gear).

[0117] In the forward gear overheat alarm strategy, if the current friction plate temperature exceeds the forward gear overheat alarm prompt value, the overheat alarm is triggered; if the current friction plate temperature drops to the forward gear overheat alarm elimination prompt value, the overheat alarm is eliminated.

[0118] In the reverse gear overheat alarm strategy, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the overheat alarm is triggered; if the current friction plate temperature drops to the reverse gear overheat alarm prompt value, the overheat alarm is eliminated.

[0119] Among them, the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy, and the forward gear overheat elimination alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat elimination alarm prompt value in the reverse gear overheat alarm strategy.

[0120] It should be noted that the value of the reverse gear overheating alarm prompt value is determined based on the critical value of the friction plate ablation temperature, so as to avoid the situation where the friction plate temperature rises to the reverse gear overheating alarm prompt value, resulting in the friction plate ablation due to the lack of gear oil medium.

[0121] The alarm strategy execution unit 203 is configured to execute the target overheat alarm strategy.

[0122] In summary, the present invention discloses a vehicle control device that determines the current gear position and current friction plate temperature of the vehicle, and determines the matching target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy based on whether the current gear position is the forward gear or the reverse gear, and in combination with the magnitude of the current friction plate temperature, and executes the target overheat alarm strategy. The present invention sets corresponding overheat alarm strategies for the forward gear and the reverse gear respectively, and the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy is smaller than the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy. Since the reverse gear overheat alarm prompt value is determined based on the friction plate ablation temperature critical value, when the vehicle is in the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate ablation will not occur, thereby achieving the purpose of the friction plate overheat alarm.

[0123] In one embodiment, the alarm strategy determination unit 202 may include:

[0124] The judgment subunit is used to judge whether the current friction plate temperature exceeds the reverse gear overheating alarm prompt value and does not reach the forward gear overheating alarm prompt value when the current gear is the forward gear.

[0125] The first alarm strategy determination subunit is used to determine that the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the forward gear to the reverse gear when the judgment subunit determines that the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy.

[0126] In one embodiment, the first alarm strategy determination subunit is further configured to:

[0127] When the first gear switching instruction from the forward gear to the reverse gear is not received, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0128] In one embodiment, the first alarm strategy determination subunit is further configured to:

[0129] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0130] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0131] When the absolute value of the first difference is smaller than the first preset speed difference, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0132] In one embodiment, the first alarm strategy determination subunit is further configured to:

[0133] When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear;

[0134] determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0135] When the absolute value of the first difference is not less than a first preset speed difference, obtaining a first duration during which the absolute value of the first difference is not less than the first preset speed difference;

[0136] When the first duration reaches the first duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

[0137] In one embodiment, the alarm strategy determination unit 202 may include:

[0138] A control subunit, configured to control an instrument to prompt a friction plate overheat alarm message when the current gear is the reverse gear and the current friction plate temperature exceeds the reverse gear overheat alarm prompt value;

[0139] The second alarm strategy determination subunit is configured to determine whether the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy according to whether the current gear is switched from the reverse gear to the forward gear.

[0140] In one embodiment, the second alarm strategy determination subunit is further configured to:

[0141] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0142] determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0143] When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference;

[0144] When the second duration does not reach a second duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

[0145] In one embodiment, the second alarm strategy determination subunit is further configured to:

[0146] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0147] determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle;

[0148] When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference;

[0149] When the second duration reaches a second duration threshold, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

[0150] It should be noted that, for the specific working principles of the various components in the device embodiment, please refer to the corresponding part of the method embodiment, which will not be repeated here.

[0151] Corresponding to the above embodiment, Figure 3 As shown, the present invention also provides a structural diagram of a controller in a vehicle, and the controller may include: a processor 1 and a memory 2;

[0152] The processor 1 and the memory 2 communicate with each other via a communication bus 3.

[0153] Processor 1, configured to execute at least one instruction;

[0154] Memory 2, used to store at least one instruction;

[0155] The processor 1 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0156] The memory 2 may include a high-speed RAM (Random Access Memory), and may also include a non-volatile memory (NVM), such as at least one disk memory.

[0157] Among them, the processor executes at least one instruction to implement the steps shown in the embodiment of the vehicle control method.

[0158] The present invention also discloses a computer storage medium, which stores at least one instruction. When the at least one instruction is executed by a processor, the steps shown in the embodiment of the vehicle control method are implemented.

[0159] Computer storage media can be tangible media that can contain or store programs for use by or in conjunction with an instruction execution system, device, or apparatus. Computer storage media can be machine-readable signal media or machine-readable storage media. Computer storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories, optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0160] 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 device comprising 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 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 device comprising the element.

[0161] 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.

[0162] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle control method, characterized in that: include: Determine the vehicle's current gear and current friction plate temperature; Determining a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature; executing the target overheat alarm strategy; The target overheat alarm strategy is: a forward gear overheat alarm strategy or a reverse gear overheat alarm strategy, the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy, and the reverse gear overheat alarm prompt value is determined based on a friction plate ablation temperature critical value; The process of determining a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature includes: When the current gear is the forward gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value but does not reach the forward gear overheat alarm prompt value, when a first gear shift instruction from the forward gear to the reverse gear is received, the current gear is shifted to the reverse gear; determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle; When the absolute value of the first difference is less than the first preset speed difference, determining that the target overheat alarm strategy is the forward gear overheat alarm strategy; or, When the current gear is the reverse gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the control instrument prompts a friction plate overheat alarm message; When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear; determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle; When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference; When the second duration does not reach a second duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

2. The vehicle control method according to claim 1, characterized in that: Also includes: When the first gear switching instruction from the forward gear to the reverse gear is not received, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

3. The vehicle control method according to claim 1, characterized in that: Also includes: When the absolute value of the first difference is not less than a first preset speed difference, obtaining a first duration during which the absolute value of the first difference is not less than the first preset speed difference; When the first duration reaches the first duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

4. The vehicle control method according to claim 1, wherein: Also includes: When the second duration reaches a second duration threshold, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

5. A vehicle control device, characterized in that: include: An initial parameter determination unit, used to determine the current gear position and current friction plate temperature of the vehicle; an alarm strategy determination unit, which determines a matching target overheat alarm strategy based on whether the current gear is a forward gear or a reverse gear and the current friction plate temperature; an alarm strategy execution unit, configured to execute the target overheat alarm strategy; The target overheat alarm strategy is: a forward gear overheat alarm strategy or a reverse gear overheat alarm strategy, the forward gear overheat alarm prompt value in the forward gear overheat alarm strategy is greater than the reverse gear overheat alarm prompt value in the reverse gear overheat alarm strategy, and the reverse gear overheat alarm prompt value is determined based on a friction plate ablation temperature critical value; The alarm strategy determination unit is specifically used to: When the current gear is the forward gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value but does not reach the forward gear overheat alarm prompt value, when a first gear shift instruction from the forward gear to the reverse gear is received, the current gear is shifted to the reverse gear; determining a first absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle; When the absolute value of the first difference is less than the first preset speed difference, determining that the target overheat alarm strategy is the forward gear overheat alarm strategy; or, When the current gear is the reverse gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the control instrument prompts a friction plate overheat alarm message; When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear; determining a second absolute value of a difference between a rotational speed of a front axle of the vehicle and a rotational speed of a rear axle of the vehicle; When the absolute value of the second difference is not less than the second preset speed difference, obtaining a second duration during which the absolute value of the second difference is not less than the second preset speed difference; When the second duration does not reach a second duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

6. A vehicle comprising a controller, characterized in that: The controller includes a memory and a processor; The memory is used to store at least one instruction; The processor is configured to execute the at least one instruction to implement the vehicle control method according to any one of claims 1 to 4.

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