Vehicle control method and system and vehicle

Abstract

The invention discloses a vehicle control method and system and a vehicle, the current gear and the current friction plate temperature of the vehicle are determined, a matched target overheating alarm strategy is determined as a forward gear overheating alarm strategy or a reverse gear overheating alarm strategy according to the fact that the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature, and the vehicle is controlled according to the determined target overheating alarm strategy. And executing the target overheating alarm strategy. The corresponding overheating alarm strategies are set for the forward gear and the reverse gear respectively, and the reverse gear overheating alarm prompt value in the reverse gear overheating alarm strategies is smaller than the forward gear overheating alarm prompt value in the forward gear overheating alarm strategies. Due to the fact that the value of the reverse gear overheating alarm prompt value is determined on the basis of the friction plate ablation temperature critical value, when the vehicle is in the reverse gear and the temperature of the friction plate rises to the reverse gear overheating alarm prompt value, the friction plate ablation condition cannot occur, and the purpose of 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] The four-wheel system, also known as the all-wheel drive system, means that both the front and rear wheels of the car 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 car's driving ability. During the vehicle's driving process, some road conditions require four-wheel drive, such as driving on slippery ice and snow roads and uneven roads, or when the wheels are stuck in mud pits and slipping or climbing hills, the vehicle requires a larger driving force, and both the front and rear wheels need power drive to improve the vehicle's passing performance. The transfer case is an important transmission component in four-wheel drive vehicles. It realizes the vehicle's four-wheel drive function by outputting the transmission input torque to the front and rear axles. Specifically, the transfer case realizes the four-wheel drive function by compressing the internal friction plate, but due to the limitation of the torque capacity of the friction plate, the vehicle has the problem of friction plate overheating when driving in four-wheel drive on non-paved roads.

[0003] In the related art, an overheat alarm is triggered when the friction plate temperature rises to 200°C. However, when the vehicle is in reverse gear, due to the limited position of the reverse gear oil pump, when the friction plate temperature rises to 200°C, the oil cannot lubricate the friction plate, resulting in the friction plate having no gear oil medium and the friction plate being burned, thus failing to achieve 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 current gear position and current friction plate temperature of the vehicle;

[0007] Determining a matching target overheat alarm strategy according to 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: a forward gear overheating alarm strategy or a 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, according to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy includes:

[0014] When the first gear switching instruction for switching 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, according to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy 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 rotation speed of a front axle of the vehicle and a rotation 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 alarm strategy is determined to be the forward gear overheat alarm strategy.

[0019] Optionally, according to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy 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 rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle;

[0022] When the absolute value of the first difference is not less than the 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;

[0023] When the first duration reaches the first duration threshold, the target overheat warning strategy is determined to be the reverse gear overheat warning strategy.

[0024] 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:

[0025] 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 the friction plate overheat alarm information;

[0026] 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 reverse gear to the forward gear.

[0027] 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 reverse gear to the forward gear includes:

[0028] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0029] determining a second absolute value of a difference between a rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle;

[0030] 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;

[0031] 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.

[0032] 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 reverse gear to the forward gear includes:

[0033] When receiving a second gear switching instruction from the reverse gear to the forward gear, switching the current gear to the forward gear;

[0034] determining a second absolute value of a difference between a rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle;

[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 according to whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature;

[0040] An alarm strategy execution unit, used for executing the target overheat alarm strategy;

[0041] Among them, the target overheating alarm strategy is: a forward gear overheating alarm strategy or a 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 used 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 according to 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 the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate will not be ablated, and the purpose of the friction plate overheat alarm is achieved. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying 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 diagram of the structure of a vehicle control device disclosed in an embodiment of the present invention;

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

[0050] In the prior art, the overheat alarm is usually triggered when the friction plate temperature reaches the overheat alarm prompt value of 200°C, and the overheat alarm is eliminated when the friction plate temperature drops to the overheat alarm prompt value of 160°C. When the vehicle is in reverse gear (R gear), the reverse gear oil pump position is limited, and the oil cannot lubricate the friction plate. When the temperature of the friction plate rises to 200°C, the friction plate has no gear oil medium, which causes the friction plate to burn, and the purpose of the friction plate overheat alarm is not achieved.

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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, determine 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 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 the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate will not be ablated, 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, determining the current gear position and current friction plate temperature of the vehicle.

[0055] The friction plate will generate a lot of heat during the friction process, causing the temperature of the friction plate to rise rapidly, and may even exceed 200°C. In such a high temperature environment, traditional temperature sensors may not work properly or the measurement accuracy may be affected. In addition, the friction plate is in direct contact with the counterpart (such as the brake drum, clutch pressure plate, etc.) and produces friction. This contact not only makes it difficult to install the temperature sensor, but may also damage the temperature sensor due to wear. Based on this, the friction plate temperature is not directly collected by the temperature sensor, but is calculated based on parameters such as the slippage amount and slippage time of the front and rear axles of the vehicle.

[0056] Step S102: determining a matching target overheat alarm strategy according to 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 reverse gear oil pump position 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, the present 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 elimination 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 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 overheat alarm 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 a forward gear or a reverse gear, the present application also combines the current friction plate temperature to determine whether the matching target overheating alarm strategy is a forward gear overheating alarm strategy or a 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 the current friction plate temperature of the vehicle, 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 combines 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 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 the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate will not be ablated, 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] The present 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, according to whether the current gear is switched from the forward gear to the reverse gear, the process of determining that the target overheat alarm strategy is the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy may specifically include:

[0074] When the first gear switching instruction for switching 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 as follows: if the current friction plate temperature exceeds the forward gear overheating alarm prompt value, an 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, according to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy 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 rotation speed of a front axle of the vehicle and a rotation 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 alarm strategy is determined to be the forward gear overheat alarm strategy.

[0080] In this application, when the current gear is the forward gear, the current friction plate temperature exceeds the reverse gear overheat alarm prompt value and does not reach the forward gear overheat alarm prompt value, and it is determined whether the vehicle's working condition can switch gears. At this time, when the first gear switch instruction from the forward gear to the reverse gear is received, the current gear is directly switched to the reverse gear. Under normal circumstances, when the vehicle is in the reverse gear, a certain speed difference is allowed between the front axle and the rear axle of the vehicle to adapt to turning or driving under different road conditions. When the absolute value of the first difference between the front axle speed of the vehicle and the rear axle speed of the vehicle is less than the first preset speed difference, it indicates that the vehicle has not completely entered the reverse state during the process of engaging the reverse gear, and the forward gear overheat alarm strategy is still executed at this time.

[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, 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 of 160℃, the forward gear overheating alarm prompt value of 200℃, and the first preset speed difference of 50rpm as an example, when the current gear of the vehicle is the forward gear, if the current friction plate temperature of the vehicle exceeds 160℃ and does not reach 200℃, it indicates that the vehicle's operating condition can achieve gear switching at this time. When the first gear switching instruction is received, the current gear of the vehicle 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 engaging 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, according to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy as the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy 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 rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle;

[0086] When the absolute value of the first difference is not less than the 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 the present application, when the current gear is the forward gear, the current friction plate temperature exceeds the reverse gear overheat alarm prompt value and does not reach the forward gear overheat alarm prompt value, it is determined whether the vehicle's working condition can be switched. At this time, when the first gear switching instruction from the forward gear to the reverse gear is received, the current gear is directly switched to the reverse gear. When the absolute value of the first difference between the vehicle front axle speed and the vehicle rear axle speed is not less than the first preset speed difference, it is also necessary to further determine whether the vehicle has completely entered the reverse state by judging whether the first duration during which the absolute value of the first difference is not less than the first preset speed difference reaches the first duration threshold. When the first duration reaches the first duration threshold, it is determined that the vehicle has completely entered the reverse state. At this time, the target overheat alarm strategy is 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: 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 elimination overheat alarm prompt value, 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 of 160℃, the forward gear overheating alarm prompt value of 200℃, the first preset speed difference of 50rpm, and the first duration threshold of 5s as an example, when the current gear of the vehicle is the forward gear, if the current friction plate temperature of the vehicle exceeds 160℃ and does not reach 200℃, it indicates that the operating condition of the vehicle can achieve gear switching at this time. When the first gear switching instruction is received, the current gear of the vehicle is switched to the reverse gear. When the absolute value of the first difference between the front axle speed of the vehicle and the rear axle speed of the vehicle is not less than 50rpm, and the absolute value of the first difference is not less than the first preset speed difference. 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 that 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 prompt value of 160°C as an example, when the vehicle's current gear is reverse gear, if the vehicle's current friction plate temperature exceeds 160°C, the instrument immediately prompts the friction plate overheat alarm information. This application further determines whether the current gear is switched from reverse gear to forward gear, that is, this application further determines whether a gear switching instruction is received, so as to finally 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 according to 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 rotation speed of a front axle of the vehicle and a rotation 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] When the current gear of the vehicle is the reverse gear, when the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, causing the instrument to prompt the friction plate overheat alarm information, if the second gear switching instruction is received, the current gear of the vehicle is switched to the forward gear. Under normal circumstances, when the vehicle is in the reverse gear, a certain speed difference is allowed between the front axle and the rear axle of the vehicle to adapt to turning or driving under different road conditions. When the absolute value of the first difference between the front axle speed of the vehicle and the rear axle speed of the vehicle is not less than the second preset speed difference, if the second duration of the absolute value of the second difference is not less than the second preset speed difference does not reach the second duration threshold, it indicates that the vehicle has not fully entered the forward state. At this time, it is determined that the target overheat alarm strategy is still the reverse gear overheat alarm strategy.

[0101] Wherein, under normal circumstances, when the vehicle is in the forward gear, the maximum speed difference between the front axle of the vehicle and the rear axle of the vehicle is allowed, and the second preset speed difference is a value greater than 0, for example, the second preset speed difference is 50rpm. The value of the absolute value of the second difference depends on actual needs, and the present invention does not limit it here. The value of the second duration threshold depends on actual needs, for example, 5s, and the present invention does not limit it here.

[0102] Taking the reverse gear overheat alarm prompt value as 160℃, the second preset speed difference as 50rpm, and the second duration threshold as 5s as an example, when the vehicle's current gear is the reverse gear, if the vehicle's current friction plate temperature exceeds 160℃, the instrument immediately prompts the friction plate overheat alarm information. When the second gear shift instruction is received, the vehicle's current gear is switched to the 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 50rpm, and the absolute value of the second difference is not less than the second preset speed difference, and the second duration is less than 5s, it is determined that the vehicle has not fully entered the forward gear state, and at this time, it is determined that the target overheat alarm strategy is still 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 according to 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 rotation speed of a front axle of the vehicle and a rotation 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 current gear of the vehicle is the reverse gear, when the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, causing the instrument to prompt the friction plate overheat alarm information, if the second gear switching instruction is received, the current gear of the vehicle is switched to the forward gear. Under normal circumstances, when the vehicle is in the reverse gear, a certain speed difference is allowed between the front axle and the rear axle of the vehicle to adapt to turning or driving under different road conditions. When the absolute value of the first difference between the front axle speed of the vehicle and the rear axle speed of the vehicle is not less than the second preset speed difference, if the second duration of the second difference that is not less than the second preset speed difference reaches the second duration threshold, it indicates that the vehicle has completely entered the forward state, and at this time, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0109] Taking the reverse gear overheat alarm prompt value as 160°C, the second preset speed difference as 50rpm, and the second duration threshold as 5s as an example, when the vehicle's current gear is the reverse gear, if the vehicle's current friction plate temperature exceeds 160°C, the instrument immediately prompts the friction plate overheat alarm information. When the second gear shift instruction is received, the vehicle's current gear is switched to the 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 50rpm, and the absolute value of the second difference is not less than the second preset speed difference for a second duration of not less than 5s, it is determined that the vehicle has completely entered the forward gear state, and at this time, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

[0110] In summary, when switching between the forward gear and the reverse gear, 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, 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 diagram of the structure 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 will generate a lot of heat during the friction process, causing the temperature of the friction plate to rise rapidly, and may even exceed 200°C. In such a high temperature environment, traditional temperature sensors may not work properly or the measurement accuracy may be affected. In addition, the friction plate is in direct contact with the counterpart (such as the brake drum, clutch pressure plate, etc.) and produces friction. This contact not only makes it difficult to install the temperature sensor, but may also damage the temperature sensor due to wear. Based on this, the friction plate temperature is not directly collected by the temperature sensor, but is calculated based on parameters such as the slippage amount and slippage time of the front and rear axles of the vehicle.

[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 in combination with 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, so that when the temperature of the 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, the present 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 elimination 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 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 used to execute the target overheat alarm strategy.

[0122] In summary, the present invention discloses a vehicle control device, which determines the current gear position and the current friction plate temperature of the vehicle, 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 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 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 the reverse gear, when the friction plate temperature rises to the reverse gear overheat alarm prompt value, the friction plate will not be ablated, 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 overheat alarm prompt value and does not reach the forward gear overheat 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 it is yes.

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

[0127] When the first gear switching instruction for switching 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 rotation speed of a front axle of the vehicle and a rotation 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 alarm strategy is determined to be the forward gear overheat alarm 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 rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle;

[0135] When the absolute value of the first difference is not less than the 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 the 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 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 reverse gear to the forward gear.

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

[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 rotation speed of a front axle of the vehicle and a rotation 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 used for:

[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 rotation speed of a front axle of the vehicle and a rotation 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 each component 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 schematic 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 (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 vehicle control method embodiment.

[0158] The present invention also discloses a computer storage medium, wherein the computer storage medium stores at least one instruction, and 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 may be tangible media that may contain or store programs for use by or in conjunction with an instruction execution system, device, or apparatus. Computer storage media may be machine-readable signal media or machine-readable storage media. Computer storage media may 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 may 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 article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[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 enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather 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 current gear position and current friction plate temperature of the vehicle; Determining a matching target overheat alarm strategy according to 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; Among them, the target overheating alarm strategy is: a forward gear overheating alarm strategy or a 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.

2. The vehicle control method according to claim 1, characterized in that: The method of determining a matching target overheat alarm strategy according to 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, 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; 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.

3. The vehicle control method according to claim 2, characterized in that: According to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy includes: When the first gear switching instruction for switching 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.

4. The vehicle control method according to claim 2, characterized in that: According to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy includes: When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear; determining a first absolute value of a difference between a rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle; When the absolute value of the first difference is smaller than the first preset speed difference, the target overheat alarm strategy is determined to be the forward gear overheat alarm strategy.

5. The vehicle control method according to claim 2, characterized in that: According to whether the current gear is switched from the forward gear to the reverse gear, determining the target overheat alarm strategy to be the forward gear overheat alarm strategy or the reverse gear overheat alarm strategy includes: When receiving a first gear switching instruction from the forward gear to the reverse gear, switching the current gear to the reverse gear; determining a first absolute value of a difference between a rotation speed of a front axle of the vehicle and a rotation speed of a rear axle of the vehicle; When the absolute value of the first difference is not less than the 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.

6. The vehicle control method according to claim 1, characterized in that: The method of determining a matching target overheat alarm strategy according to 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 reverse gear, if the current friction plate temperature exceeds the reverse gear overheat alarm prompt value, the control instrument prompts the friction plate overheat alarm information; 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 reverse gear to the forward gear.

7. The vehicle control method according to claim 6, characterized in that: The step of 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 reverse gear to the forward gear comprises: 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 rotation speed of a front axle of the vehicle and a rotation 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.

8. The vehicle control method according to claim 6, characterized in that: The step of 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 reverse gear to the forward gear comprises: 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 rotation speed of a front axle of the vehicle and a rotation 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 reaches a second duration threshold, the target overheat warning strategy is determined to be the forward gear overheat warning strategy.

9. 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 according to whether the current gear is a forward gear or a reverse gear and in combination with the current friction plate temperature; An alarm strategy execution unit, used for executing the target overheat alarm strategy; Among them, the target overheating alarm strategy is: a forward gear overheating alarm strategy or a 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.

10. 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 8.

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