Brake disc temperature control method and system, vehicle and storage medium

Abstract

The invention relates to the technical field of vehicle control, in particular to a brake disc temperature control method and system, a vehicle and a storage medium, and the method comprises the following steps: when the whole vehicle is in a dynamic driving state, receiving a sliding energy recovery target torque and an energy recovery maximum capacity value; when it is judged that the sliding energy recovery target torque is larger than the maximum energy recovery capacity value and the temperature of a brake disc is larger than a first disc temperature threshold value and smaller than a second disc temperature threshold value, a torque decline coefficient is set, the sliding energy recovery target torque is corrected according to the torque decline coefficient, and the sliding energy recovery target torque is corrected according to the corrected sliding energy recovery target torque. And a sliding energy recovery torque recession value is obtained so as to weaken the mechanical braking torque compensation force of the braking system. While the deceleration consistency and the driving experience of the whole vehicle are ensured, the overheating risk of the brake disc can be effectively monitored and prevented, and the overall safety and reliability of the electric vehicle are improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a brake disc temperature control method, system, vehicle and storage medium. Background Art

[0002] As the world pays more and more attention to environmental protection and energy conservation and emission reduction, electric vehicles, as a green alternative to traditional fuel vehicles, are gradually becoming the mainstream trend in the automotive market. Electric vehicles, with their advantages such as zero emissions and low noise, have attracted widespread attention and favor from governments, enterprises and consumers. However, the range of electric vehicles has always been one of the key factors restricting their widespread application. In order to improve the range of electric vehicles, the industry continues to explore various technical approaches. Among them, the energy recovery system, as an important technical means to improve the energy efficiency of the entire vehicle, has been widely studied and applied.

[0003] As one of the key technologies to improve the endurance of electric vehicles, the energy recovery system is to efficiently convert the kinetic energy generated by the vehicle during braking or deceleration into electrical energy and store it, thereby achieving energy recycling and significantly improving the energy efficiency of the entire vehicle. This mechanism not only extends the driving distance of electric vehicles, but also promotes the sustainability of energy utilization.

[0004] However, when the battery is close to full charge, the energy recovery system faces a major challenge: how to avoid overcharging to protect the battery safety. One of the current solutions is to suspend energy recovery when the battery is fully charged, but this brings up the issue of how to maintain the consistency and stability of the vehicle's deceleration. Traditionally, the negative torque of the motor is compensated by mechanical hydraulic torque to ensure the continuity and reliability of braking performance. However, excessive and frequent compensation of mechanical hydraulic torque may cause safety hazards such as brake disc overheating and thermal decay, especially in complex and changeable driving environments, such as long downhill sections, where these problems are particularly severe.

[0005] At present, although some patent documents such as CN117382436A have proposed energy recovery control methods and designed corresponding brake hydraulic compensation strategies to ensure the consistency of vehicle deceleration under weak energy recovery conditions of the power system. This method focuses on optimizing the torque control strategy to ensure the driving experience. However, this method lacks comprehensive and in-depth consideration and solutions for safety issues brought about by the brake system compensation hydraulic strategy, such as the risk of brake disc overheating and its prevention and control measures.

[0006] Therefore, it is necessary to develop a new brake disc temperature control method, system, vehicle and storage medium. Summary of the invention

[0007] The purpose of the present invention is to provide a brake disc temperature control method, system, vehicle and storage medium, which can effectively monitor and prevent the risk of brake disc overheating while ensuring the consistency of vehicle deceleration and driving experience, thereby improving the overall safety and reliability of electric vehicles.

[0008] In a first aspect, a brake disc temperature control method according to the present invention comprises the following steps:

[0009] When the vehicle is in a dynamic driving state, receiving a coasting energy recovery target torque and a maximum energy recovery capacity value;

[0010] In response to determining that the coasting energy recovery target torque is greater than the energy recovery maximum capacity value, and the temperature of the brake disc is greater than a first disc temperature threshold and less than a second disc temperature threshold, a torque decay coefficient is set, and the coasting energy recovery target torque is corrected according to the torque decay coefficient to obtain a coasting energy recovery torque decay value, so as to weaken the mechanical braking torque compensation strength of the braking system.

[0011] Optionally, the coasting energy recovery target torque is corrected according to the torque decay coefficient to obtain a coasting energy recovery torque decay value, specifically:

[0012] The coasting energy recovery torque decay value is equal to the product of the torque decay coefficient and the coasting energy recovery target torque. The present invention introduces the torque decay coefficient to accurately correct the coasting energy recovery target torque, ensuring that the recovery torque can be appropriately reduced when the brake disc temperature is high, reducing the hydraulic compensation strength of the braking system, thereby controlling the further increase of the brake disc temperature. This correction method can maintain the efficiency of coasting energy recovery as much as possible while ensuring the safety of the brake disc temperature, achieving dual optimization of performance and safety.

[0013] Optionally, the torque decay coefficient is set as follows:

[0014] Get vehicle speed;

[0015] determining a first torque compensation value, wherein the first torque compensation value is a difference between the coasting energy recovery target torque and the energy recovery maximum capacity value;

[0016] Based on a preset mapping relationship, the torque decay coefficient corresponding to the first torque compensation value and the vehicle speed is determined, and the preset mapping relationship is the correspondence between the first torque compensation value, the vehicle speed and the torque decay coefficient. The torque decay coefficient is dynamically set according to the vehicle speed and the first torque compensation value (i.e., the difference between the coasting energy recovery target torque and the energy recovery maximum capacity value), so that the correction is more personalized and accurate. By determining the torque decay coefficient through a preset mapping relationship, errors in human judgment are avoided, the accuracy and reliability of the correction are improved, and the energy recovery efficiency is improved as much as possible under the premise of ensuring reliable vehicle braking.

[0017] Optionally, after obtaining the coasting energy recovery torque decay value, the difference between the coasting energy recovery target torque and the coasting energy recovery torque decay value is calculated and used as the corrected mechanical braking torque. The present invention makes the driving experience of the vehicle during the coasting process more stable and comfortable by balancing the coasting energy recovery and the mechanical braking torque.

[0018] Optionally, it also includes:

[0019] When the coasting energy recovery target torque is greater than the maximum energy recovery capacity value, and the temperature of the brake disc is less than or equal to the first disc temperature threshold, the braking system compensates the mechanical braking torque, but does not adjust the coasting energy recovery target torque, that is, the mechanical braking torque is equal to the first torque compensation value. When the coasting energy recovery target torque is greater than the maximum energy recovery capacity value and the brake disc temperature is low, the mechanical braking torque is compensated to ensure that the braking effect is not affected, and the coasting energy recovery target torque is not adjusted to maintain a high recovery efficiency. This strategy finds a balance between ensuring braking performance and coasting energy recovery efficiency, and achieves comprehensive optimization.

[0020] Optionally, it also includes:

[0021] When the temperature of the brake disc exceeds the second disc temperature threshold, the brake system exits the mechanical braking torque compensation until the temperature of the brake disc is less than the second disc temperature threshold. When the temperature of the brake disc exceeds the second disc temperature threshold, the mechanical braking torque compensation mechanism is exited in time to prevent the brake disc from being damaged due to excessive temperature and ensure the long-term reliability of the brake system.

[0022] Optionally, it also includes:

[0023] When the sliding energy recovery target torque is less than or equal to the energy recovery maximum capacity value, the braking system does not compensate the mechanical braking torque. The present invention can maximize the use of sliding energy recovery and improve energy utilization efficiency.

[0024] In a second aspect, a brake disc temperature control system according to the present invention comprises a controller and a memory, wherein the memory stores a computer-readable program, and when the computer-readable program is called by the controller, the steps of the brake disc temperature control method according to the present invention can be executed.

[0025] In a third aspect, a vehicle according to the present invention adopts the brake disc temperature control system according to the present invention.

[0026] In a fourth aspect, a storage medium according to the present invention stores a computer-readable program, and when the computer-readable program is called, the steps of the brake disc temperature control method according to the present invention can be executed.

[0027] Beneficial effects of the present invention:

[0028] (1) During the driving of the electric vehicle, the system first compares and analyzes the preset coasting energy recovery target torque with the maximum capacity value of the current energy recovery system. Once it is found that the energy recovery capacity is insufficient to meet the braking demand, the present invention can immediately start the braking system and intelligently supplement the mechanical braking torque. This mechanism ensures that the electric vehicle can provide a stable and consistent vehicle deceleration driving experience whether it is fully charged or not, greatly improving the driving comfort and predictability.

[0029] (2) In order to further ensure the long-term stability and safety of the braking system, the present invention innovatively introduces a brake disc temperature monitoring mechanism. By setting a scientific and reasonable first disc temperature threshold and a second disc temperature threshold, the system can obtain the current temperature of the brake disc in real time and automatically perform comparison analysis. When the brake disc temperature is between these two thresholds, the system will intelligently weaken the hydraulic compensation force of the braking system to slow down the temperature rise rate of the brake disc. When the brake disc temperature exceeds the second temperature threshold, the system will immediately take more radical measures and directly exit the mechanical braking torque compensation, thereby effectively avoiding the thermal decay phenomenon caused by the brake disc being too hot, and ensuring that the braking performance is not affected.

[0030] (3) The present invention not only ensures the consistency of braking performance of electric vehicles under different working conditions, but also significantly reduces the risk of brake disc overheating and prolongs the service life of the braking system. Especially under long-term gliding or high-load braking conditions, the application of the present invention can greatly improve driving safety and provide passengers with a more secure and stable travel experience.

[0031] In summary, the present invention achieves comprehensive optimization and improvement of the braking performance of electric vehicles through intelligent energy recovery and mechanical braking coordinated control, as well as innovative brake disc temperature management strategy, and makes important contributions to the safe driving and sustainable development of the electric vehicle industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of the brake disc temperature control method described in an embodiment of the present application;

[0033] Figure 2 This is a principle block diagram of the brake disc temperature control system described in the embodiment of the present application;

[0034] Figure 3 This is a system architecture diagram of the brake disc temperature control method described in an embodiment of the present application;

[0035] Figure 4 It is a principle block diagram of the braking system described in the embodiment of the present application;

[0036] Figure 5 This is a specific flow chart of the brake disc temperature control method described in the embodiment of the present application;

[0037] In the figure: 1-memory, 2-controller, 3-power system, 4-brake system, 41-temperature monitoring module, 42-torque arbitration module, 43-hydraulic execution module. DETAILED DESCRIPTION

[0038] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0039] like Figure 1 As shown, in an embodiment of the present application, a brake disc temperature control method includes the following steps:

[0040] When the vehicle is in a dynamic driving state, the coasting energy recovery target torque and the maximum energy recovery capacity value are received.

[0041] When it is determined that the coasting energy recovery target torque is greater than the maximum energy recovery capacity value, and the temperature of the brake disc is greater than the first disc temperature threshold and less than the second disc temperature threshold, the torque decay coefficient is set, and the coasting energy recovery target torque is corrected according to the torque decay coefficient to obtain the coasting energy recovery torque decay value, so as to weaken the mechanical braking torque compensation strength of the braking system 4.

[0042] In a possible embodiment, when the temperature of the brake disc exceeds the second disc temperature threshold, the brake system 4 exits the mechanical braking torque compensation until the temperature of the brake disc is less than the second disc temperature threshold. When the temperature of the brake disc exceeds the second disc temperature threshold, the mechanical braking torque compensation mechanism is exited in time to prevent the brake disc from being damaged due to excessive temperature, thereby ensuring the long-term reliability of the brake system.

[0043] In a possible embodiment, when the coasting energy recovery target torque is less than or equal to the maximum energy recovery capacity value, the braking system 4 does not compensate for the mechanical braking torque, which can maximize the use of coasting energy recovery and improve energy utilization efficiency.

[0044] In a possible embodiment, when the coasting energy recovery target torque is greater than the maximum energy recovery capacity value and the temperature of the brake disc is less than or equal to the first disc temperature threshold, the brake system 4 compensates the mechanical braking torque, but does not adjust the coasting energy recovery target torque, that is, at this time, the mechanical braking torque is equal to the first torque compensation value. When the coasting energy recovery target torque is greater than the maximum energy recovery capacity value and the brake disc temperature is low, the mechanical braking torque is compensated to ensure that the braking effect is not affected, and the coasting energy recovery target torque is not adjusted to maintain a high recovery efficiency. This strategy finds a balance between ensuring braking performance and coasting energy recovery efficiency, and achieves comprehensive optimization.

[0045] like Figure 3 As shown, in a possible embodiment, a system architecture for implementing the energy recovery control method is also proposed, including a power system 3 and a braking system 4. The braking system 4 is responsible for receiving the sliding energy recovery target torque and the maximum energy recovery capacity output by the power system 3, monitoring the brake disc temperature, arbitrating the sliding energy recovery target torque, and executing the mechanical braking torque. The power module is responsible for parsing the sliding energy recovery target torque of the whole vehicle and parsing the maximum energy recovery capacity.

[0046] like Figure 4 As shown, in a possible embodiment, the brake system 4 includes a temperature monitoring module 41, a torque arbitration module 42 and a hydraulic execution module 43, and the torque arbitration module 42 is respectively connected to the temperature monitoring module 41 and the hydraulic execution module 43. The temperature monitoring module 41 is used to monitor the real-time temperature of the brake disc, the torque arbitration module 42 is used to arbitrate the torque request of the external controller, and the hydraulic execution module 43 is used to compensate for the mechanical braking torque.

[0047] like Figure 5 As shown, the steps of the energy recovery control method are described in detail below in combination with the system architecture. The method includes the following steps:

[0048] Step S101: the vehicle is in a dynamic driving state, and the braking system 4 receives the coasting energy recovery target torque and the energy recovery maximum capacity value output by the power system 3.

[0049] Step S102: Determine whether the coasting energy recovery target torque is greater than the maximum energy recovery capacity value. If so, jump to step S103. If not, it means that the vehicle has sufficient energy recovery capacity at this time, and the braking system 4 does not need to compensate for the mechanical braking torque. At this time, the mechanical braking torque is equal to zero.

[0050] Step S103: Determine whether the temperature of the brake disc is greater than the first disc temperature threshold and less than the second disc temperature threshold. If so, jump to step S104. If not, it means that the energy recovery capacity of the whole vehicle is insufficient at this time, and the mechanical braking torque needs to be compensated. However, the mechanical braking torque does not cause a significant increase in the temperature of the brake disc, nor does it reach the risk of overheating of the brake disc. That is, the mechanical braking torque is equal to the difference between the coasting energy recovery target torque and the maximum energy recovery capacity value.

[0051] The first disk temperature threshold is smaller than the second disk temperature threshold, and both the first disk temperature threshold and the second disk temperature threshold are calibrated values.

[0052] Step S104: Obtaining a coasting energy recovery torque decay value according to the torque decay coefficient.

[0053] When the braking system 4 determines that the coasting energy recovery target torque is greater than the maximum energy recovery capacity value, it means that the energy recovery capacity of the whole vehicle is insufficient and the mechanical braking torque needs to be compensated. When the temperature of the brake disc is greater than the first disc temperature threshold and less than the second disc temperature threshold, it means that the mechanical braking torque has caused the temperature of the brake disc to increase significantly, but has not reached the risk of overheating of the brake disc.

[0054] At this time, in order to ensure the safety of the brake disc temperature while maximizing the driving comfort and experience, when the temperature of the brake disc is greater than the first disc temperature threshold and less than the second disc temperature threshold, the torque decay coefficient is obtained, and the sliding energy recovery target torque is corrected in real time according to the torque decay coefficient, and finally the sliding energy recovery torque decay value is obtained, thereby weakening the mechanical braking torque compensation force of the braking system 4.

[0055] In a possible embodiment, the difference between the coasting energy recovery target torque and the energy recovery maximum capacity value is defined as a first torque compensation value, and the first torque compensation value is equal to the mechanical braking torque before correction.

[0056] The calculation formula of the first torque compensation value is as follows:

[0057] The first torque compensation value=the coasting energy recovery target torque-the energy recovery maximum capability value.

[0058] In a possible embodiment, the coasting energy recovery torque decay value is equal to the product of the torque decay coefficient and the coasting energy recovery target torque, and the specific calculation formula is as follows:

[0059] Coasting energy recovery torque decay value = torque decay coefficient × coasting energy recovery target torque.

[0060] In a possible embodiment, the torque decay coefficient is set as follows:

[0061] Obtaining the vehicle speed; and determining the first torque compensation value. Based on a preset mapping relationship, determining the first torque compensation value and the torque decay coefficient corresponding to the vehicle speed, the preset mapping relationship is the correspondence between the first torque compensation value, the vehicle speed and the torque decay coefficient, see Table 1.

[0062] Table 1:

[0063] The first torque compensation value Speed Torque decay coefficient T1 V1 K1 T 2 V2 K2 T 3 V3 K3

[0064] In the table, T1, T2 and T3 represent different first torque compensation values, V1, V2 and V3 represent different vehicle speeds, K1, K2 and K3 represent different first torque compensation values ​​and torque decay coefficients corresponding to different vehicle speeds. Specific data are obtained by calibration.

[0065] In a possible embodiment, the difference between the coasting energy recovery target torque and the coasting energy recovery torque decay value is defined as the second torque compensation value, and the second torque compensation value is equal to the corrected mechanical braking torque.

[0066] The calculation formula of the second torque compensation value is as follows:

[0067] The second torque compensation value=the coasting energy recovery target torque−the coasting energy recovery torque decay value.

[0068] Step S105: Determine whether the temperature of the brake disc is greater than the second disc temperature threshold, if so, jump to step S106, otherwise jump to step S104.

[0069] Step S106: The braking system 4 determines that the energy recovery capacity of the entire vehicle is insufficient at this time and that mechanical braking torque compensation is required. However, since the temperature of the brake disc has reached the risk of brake disc overheating, the braking system 4 completely exits the mechanical braking torque compensation mechanism until the temperature of the brake disc drops to within the second disc temperature threshold.

[0070] In a possible embodiment, when the temperature of the brake disc is greater than the second disc temperature threshold, an instrument text prompt or icon warning can be set to remind the driver that the temperature of the brake disc of the entire vehicle is too high at this moment, and the driver needs to control the vehicle speed and drive carefully.

[0071] The embodiment of the present application provides an application example: on a long downhill section, the vehicle glides for a long time and has only weak energy recovery capability. If the brake system 4 is controlled to compensate the mechanical braking torque for a long time, the brake disc will have a great risk of overheating. With this control method, the brake system 4 adjusts the mechanical braking torque in real time according to the temperature of the brake disc during the gliding process, ensuring that the brake system 4 has sufficient capacity to ensure braking performance when the driver has a braking demand, thereby improving the safety of the vehicle's braking.

[0072] like Figure 2 As shown, in an embodiment of the present application, a brake disc temperature control system includes a controller 2 and a memory 1, wherein the memory 1 stores a computer-readable program, and when the computer-readable program is called by the controller 2, it can execute the steps of the brake disc temperature control method in the embodiment of the present application.

[0073] In an embodiment of the present application, a vehicle adopts a brake disc temperature control system as in the embodiment of the present application.

[0074] In an embodiment of the present application, a storage medium stores a computer-readable program. When the computer-readable program is called, the steps of the brake disc temperature control method in the embodiment of the present application can be executed.

[0075] In an embodiment of the present application, the storage medium may be a tangible storage medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. The storage medium may be a machine-readable signal storage medium or a machine-readable storage medium. The storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0076] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A brake disc temperature control method, characterized in that: The following steps are involved: When the vehicle is in a dynamic driving state, receiving a coasting energy recovery target torque and a maximum energy recovery capacity value; In response to determining that the coasting energy recovery target torque is greater than the energy recovery maximum capacity value, and the temperature of the brake disc is greater than a first disc temperature threshold and less than a second disc temperature threshold, a torque decay coefficient is set, and the coasting energy recovery target torque is corrected according to the torque decay coefficient to obtain a coasting energy recovery torque decay value, so as to weaken the mechanical braking torque compensation strength of the braking system (4).

2. The brake disc temperature control method according to claim 1, characterized in that: The coasting energy recovery target torque is corrected according to the torque decay coefficient to obtain a coasting energy recovery torque decay value, which is specifically: The coasting energy recovery torque decay value is equal to the product of the torque decay coefficient and the coasting energy recovery target torque.

3. The brake disc temperature control method according to claim 2, characterized in that: The method for setting the torque decay coefficient is as follows: Get vehicle speed; determining a first torque compensation value, wherein the first torque compensation value is a difference between the coasting energy recovery target torque and the energy recovery maximum capacity value; Based on a preset mapping relationship, a torque decay coefficient corresponding to the first torque compensation value and the vehicle speed is determined, and the preset mapping relationship is a correspondence relationship between the first torque compensation value, the vehicle speed, and the torque decay coefficient.

4. The brake disc temperature control method according to claim 3, characterized in that: After the coasting energy recovery torque decay value is obtained, the difference between the coasting energy recovery target torque and the coasting energy recovery torque decay value is calculated and used as the corrected mechanical braking torque.

5. The brake disc temperature control method according to claim 3, characterized in that: Also includes: When the coasting energy recovery target torque is greater than the energy recovery maximum capacity value, and the temperature of the brake disc is less than or equal to the first disc temperature threshold, the braking system (4) compensates the mechanical braking torque but does not adjust the coasting energy recovery target torque, that is, at this time the mechanical braking torque is equal to the first torque compensation value.

6. The brake disc temperature control method according to claim 1, characterized in that: Also includes: When the temperature of the brake disc exceeds the second disc temperature threshold, the brake system (4) exits mechanical braking torque compensation until the temperature of the brake disc is less than the second disc temperature threshold.

7. The brake disc temperature control method according to claim 1, characterized in that: Also includes: When the coasting energy recovery target torque is less than or equal to the energy recovery maximum capacity value, the braking system (4) does not compensate for the mechanical braking torque.

8. A brake disc temperature control system, characterized in that: The invention comprises a controller (2) and a memory (1), wherein the memory (1) stores a computer-readable program, and when the computer-readable program is called by the controller (2), the steps of the brake disc temperature control method according to any one of claims 1 to 7 can be executed.

9. A vehicle, characterized in that: A brake disc temperature control system as claimed in claim 8 is adopted.

10. A storage medium, characterized in that: A computer-readable program is stored, and when the computer-readable program is called, the steps of the brake disc temperature control method according to any one of claims 1 to 7 can be executed.

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