Vehicle control method

Abstract

The invention discloses a vehicle control method, the method is applied to a pure electric vehicle, a heat dissipation module is arranged in the pure electric vehicle, the heat dissipation module comprises a radiator, a water pump, a liquid buffer and cooling liquid, and the cooling liquid flows out of the radiator, flows through the water pump and the liquid buffer and then flows back to the radiator. Determining a braking demand of the vehicle in a preset time period; based on the braking requirement, whether the hydraulic buffer working condition is met or not is judged; when the hydraulic buffer working condition is met, working parameters of a heat dissipation module are determined based on the braking requirement; and controlling the heat dissipation module to dissipate heat based on the working parameters of the heat dissipation module. The hydraulic buffer is additionally arranged in the pure electric vehicle, emergency speed reduction can be conducted through the hydraulic buffer when the braking requirement of the vehicle is high, and driving safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle control, in particular to a vehicle control method. BACKGROUND

[0002] In recent years, with the development of battery technology, the proportion of pure electric vehicles is becoming higher and higher. When the existing pure electric vehicles brake, they usually adopt the mode of motor braking. At this time, the driving motor can be converted into a generator mode to convert kinetic energy into electrical energy stored in the battery (energy recovery), while generating braking torque.

[0003] However, for heavy trucks, in some extreme working conditions (such as heavy load downhill), if the motor braking force is insufficient or the battery is full and cannot recover energy, the user's braking demand cannot be met, and safety accidents are likely to occur. SUMMARY

[0004] To solve the above problems, the present application provides a method, device and medium, wherein the vehicle control method is applied to a pure electric vehicle, the pure electric vehicle is provided with a heat dissipation module, the heat dissipation module includes a radiator, a water pump, a liquid buffer and cooling liquid, the cooling liquid flows out from the radiator, flows through the water pump and the liquid buffer, and then flows back to the radiator, the vehicle control method includes: determining the braking demand of the vehicle in a preset time period based on vehicle working condition information; determining whether the liquid buffer working condition is met based on the braking demand; when the liquid buffer working condition is met, determining the heat dissipation module working parameter based on the braking demand; and controlling the heat dissipation module to dissipate heat based on the heat dissipation module working parameter.

[0005] In one example, the liquid buffer is connected in parallel with the driving motor, and the heat dissipation module is further provided with at least one multi-way valve, the multiple ends of the multi-way valve are respectively connected with the driving motor, the liquid buffer and the water pump, and the multi-way valve is used to control the cooling liquid flow value flowing through the liquid buffer.

[0006] In one example, the determination of the braking demand of the vehicle in a preset time period based on vehicle working condition information specifically includes: determining the current load of the vehicle, the current speed of the vehicle, the current driving slope and the current brake pedal depth based on the vehicle working condition information; and determining the first braking demand of the vehicle at the current time based on the current load of the vehicle, the current speed of the vehicle, the current driving slope and the current brake pedal depth.

[0007] In one example, the determining the heat dissipation module working parameter based on the braking demand specifically comprises: determining an expected liquid buffer temperature corresponding to the first braking demand based on a pre-calibrated liquid buffer parameter table; determining a first temperature difference between a current liquid buffer temperature and the first expected liquid buffer temperature, and generating a plurality of heat dissipation schemes; determining a first heat dissipation expectation value corresponding to each heat dissipation scheme based on a first preset reward function and the temperature difference; and determining a heat dissipation module working parameter corresponding to a target heat dissipation scheme from the plurality of heat dissipation schemes based on the first heat dissipation expectation value, wherein the heat dissipation module working parameter comprises a radiator power, a water pump power and a multi-way valve opening degree at a current time.

[0008] In one example, the determining the braking demand of the vehicle within a preset time period based on the vehicle working condition information specifically comprises: determining a current load of the vehicle and a current vehicle speed based on the vehicle working condition information, and obtaining road condition information within a future time period; determining a vehicle working mode within the future time period based on the current load of the vehicle and the road condition information; and predicting a second braking demand within the future time period based on the current vehicle speed and the vehicle working mode.

[0009] In one example, the determining the heat dissipation module working parameter based on the braking demand specifically comprises: determining a braking starting point of the vehicle within the future time period and a second expected liquid buffer temperature corresponding to the second braking demand; determining a second temperature difference between a current liquid buffer temperature and the second expected liquid buffer temperature; generating a plurality of advanced heat dissipation schemes based on the braking starting point and the second temperature difference; determining a second heat dissipation expectation value corresponding to each advanced heat dissipation scheme based on a second preset reward function; and determining a heat dissipation module working parameter corresponding to a target advanced heat dissipation scheme from the plurality of advanced heat dissipation schemes based on the second heat dissipation expectation value.

[0010] In one example, the heat dissipation module working parameter comprises a radiator power, a water pump power and a multi-way valve opening degree corresponding to each future time point, and the controlling the heat dissipation module to perform heat dissipation based on the heat dissipation module working parameter specifically comprises: cooling the liquid buffer in advance based on the heat dissipation module working parameter.

[0011] In one example, the cooling the liquid buffer in advance based on the heat dissipation module working parameter specifically comprises: determining a liquid buffer actual temperature corresponding to each time point and a third expected liquid buffer temperature corresponding to the target advanced heat dissipation scheme during the cooling of the liquid buffer; and re-determining a heat dissipation module working parameter based on a preset temperature difference when a difference between the liquid buffer actual temperature and the third expected liquid buffer temperature is higher than the preset temperature difference.

[0012] In one example, determining whether the hydraulic retarder operating conditions are met based on the braking demand specifically includes: acquiring current environmental information and the vehicle's current remaining battery power; determining the environmental braking demand value based on the current environmental information and the current remaining battery power; and satisfying the hydraulic retarder operating conditions when the environmental braking demand value is higher than a preset threshold.

[0013] In one example, after controlling the heat dissipation module to dissipate heat based on the operating parameters of the heat dissipation module, the method further includes: determining that the ambient temperature in the environmental information is lower than a preset temperature threshold; and returning the coolant flowing through the liquid buffer to the radiator after passing through the battery pack and / or the heater core.

[0014] The method proposed in this application can bring the following beneficial effects:

[0015] 1. By adding a hydraulic retarder to pure electric vehicles, emergency deceleration can be performed when the vehicle's braking demand is high, ensuring driving safety. The operating parameters of the cooling module are determined by the required braking demand, and the radiator, water pump, and hydraulic retarder are controlled simultaneously. This increases cooling efficiency while reducing energy loss, thereby improving the energy utilization rate of pure electric vehicles.

[0016] 2. It provides multiple liquid slow cooling circuits, which can be set up according to different vehicle models, thus improving the adaptability of the solution.

[0017] 3. By predicting braking demand in the future, the hydraulic retarder can be cooled in advance when needed to ensure its braking capacity, thereby improving driving safety and user experience.

[0018] 4. When the ambient temperature is low, the coolant flowing through the liquid buffer flows back to the radiator after passing through the battery pack and / or the heater core, thereby providing some heat to the battery pack and the heater core through the high-temperature coolant, thus reducing energy consumption.

[0019] 5. By determining whether hydraulic retardation braking is needed based on multiple factors, the timeliness and intelligence of the hydraulic retardation braking process can be improved, thereby ensuring vehicle driving safety. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of a conventional motor electronic control thermal management circuit in an embodiment of this application;

[0022] Figure 2 This is a flowchart illustrating a vehicle control method according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the first type of motor electronic control thermal management circuit in the embodiments of this application;

[0024] Figure 4 This is a schematic diagram of the second type of motor electronic control thermal management circuit in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the third type of motor electronic control thermal management circuit in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the fourth type of motor electronic control thermal management circuit in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the structure of a vehicle control device according to an embodiment of this application. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] In existing pure electric vehicle models, the motor and electronic control thermal management solutions are as follows: Figure 1 As shown, the coolant is cooled by the radiator and then pumped out by the water pump. It first cools the five-in-one controller (including the main five-in-one controller and the slave five-in-one controller), and then cools the motor (including the main drive motor and the auxiliary drive motor). The main drive motor and the auxiliary drive motor are connected in parallel, and the controller and the corresponding motor are connected in series.

[0030] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0031] Figure 2 This is a flowchart illustrating a vehicle control method provided for one or more embodiments of this specification. This method can be applied to, for example... Figure 3 In the motor electronic control thermal management circuit shown. Figure 3 In this design, a liquid buffer is added to the existing motor control thermal management circuit, forming a heat dissipation module. This module includes a radiator, a water pump, a liquid buffer, and coolant. When cooling the liquid buffer, the coolant flows out of the radiator, through the water pump and the liquid buffer, and then back to the radiator. This achieves cooling of the newly added liquid buffer within the existing motor control thermal management circuit.Figure 3 In the middle, two two-way valves are also installed between the liquid buffer and the water pump to control whether the coolant flows through the liquid buffer.

[0032] This process can be executed by the control module that controls each device in the heat dissipation module. Some input parameters or intermediate results in the process can be manually adjusted to help improve accuracy.

[0033] The analysis method involved in the embodiments of this application can be implemented by a terminal device or a server, and this application does not impose any special limitations on it. For ease of understanding and description, the following embodiments all use a control module as an example for detailed description. It should be noted that the control module can be a single processor or a system composed of multiple processors, and this application does not impose any specific limitations on it.

[0034] like Figure 2 As shown, this application provides a vehicle control method, including:

[0035] S201: Based on vehicle operating condition information, determine the vehicle's braking requirements within a preset time period.

[0036] First, sensors acquire vehicle operating condition information, including vehicle load, current speed, current driving environment, current navigation route, remaining battery power, and current pedal depth. The current driving environment can be determined by acquiring images of the vehicle's surroundings or by using the in-vehicle navigation software to obtain the current navigation route and its corresponding environmental information, such as current gradient and driving area. Once this vehicle operating condition information is known, braking requirements within a preset time period can be determined. This preset time period can be the current time, a future time period, or a future point in time.

[0037] S202: Based on the braking requirements, determine whether the working conditions of the hydraulic buffer are met.

[0038] When a vehicle has a braking demand within a preset time period, the system determines whether the hydraulic retarder needs to participate in braking based on the magnitude of the braking demand and the vehicle's current braking capacity. If the braking demand is significant and the vehicle's current braking capacity cannot meet it, the hydraulic retarder is considered to be functioning correctly.

[0039] S203: When the liquid buffer working conditions are met, determine the working parameters of the heat dissipation module based on the braking requirements.

[0040] When the operating conditions of the hydraulic retarder are met, since the braking capacity of the hydraulic retarder is related to its temperature, it is necessary to cool the hydraulic retarder before or during braking to improve its braking capacity. At this point, the operating parameters of each component in the heat dissipation module can be determined based on the braking requirements. These parameters should include radiator power, water pump power, and other parameters.

[0041] S204: Based on the operating parameters of the heat dissipation module, control the heat dissipation module to dissipate heat.

[0042] After obtaining the operating parameters of the heat dissipation module, the heat dissipation module can be controlled to dissipate heat from the hydraulic slicker, thereby reducing the temperature of the hydraulic slicker, improving its braking ability, and thus braking the vehicle and reducing its speed.

[0043] In one embodiment, besides like Figure 3 In addition to the motor electronic control thermal management solution, it can be Figure 3 The four two-way valves in the middle are replaced with two three-way valves, thus forming a structure like... Figure 4 The cooling circuit shown is used to switch between ports A and B of the three-way valve to meet the heat dissipation requirements of the motor control system or the hydraulic buffer.

[0044] During braking, both the motor and the hydraulic retarder require heat dissipation, thus demanding high coolant flow rate and temperature. To prevent the coolant flow rate from being too slow and failing to meet the cooling requirements of the retarder, a separate water pump can be installed for the retarder to increase the coolant flow rate, thereby creating a cooling effect. Figure 5 The cooling circuit shown can be used to control the opening and closing of the water pump to meet the heat dissipation needs of the motor control or the liquid buffer. Figure 5 The number of water pumps connected to the liquid buffer is two, but the number of water pumps can be dynamically adjusted according to different vehicle models. When the vehicle's braking demand is not high, only one water pump can be set up to supply the liquid buffer for cooling. This application does not limit the number of water pumps supplying the liquid buffer for cooling.

[0045] To further increase the flow rate and velocity of the coolant, a separate water pump can be installed and connected to the existing cooling circuit via a three-way valve, thereby forming a flow rate such as... Figure 5 The cooling circuit shown can be improved by controlling the switching of ports A and B of the three-way valve and coordinating with the opening and closing of the two-way valve to increase the number of water pumps and achieve a greater flow rate for cooling the liquid sump. Specifically, when all four water pumps are running simultaneously, by opening two two-way valves and opening the valve between the three-way valve and the liquid sump, all four water pumps can simultaneously supply coolant to the liquid sump, thereby achieving a greater flow rate for cooling the liquid sump.

[0046] In one embodiment, determining the vehicle's braking demand at the current moment requires determining the vehicle's current load, current speed, current gradient, and current brake pedal depth based on vehicle operating condition information. The vehicle's primary braking demand at the current moment is determined primarily through information such as the current load, current speed, current gradient, and current brake pedal depth. For example, the brake pedal depth can reflect the driver's basic braking demand, which typically exhibits a non-linear relationship with the basic braking force demand (e.g., a quadratic function or piecewise linearity). For instance:

[0047] F pedal =k1*θ+k2*θ 2

[0048] Among them, F pedal Based on the basic braking requirements, k1 and k2 are calibration coefficients, and θ is the brake pedal depth.

[0049] After obtaining the basic braking requirements, the effects of the vehicle's current load, current speed, and current gradient can be added on top of this.

[0050] For example, when superimposing the effect of the vehicle's current load, since the vehicle load directly affects the required braking force, if the total mass of the vehicle (including load) is m, then the basic braking force, which needs to be corrected for mass, can be expressed as:

[0051]

[0052] Among them, F load The intermediate braking requirement is the result of the superimposed load effect, where m is the total vehicle mass (including load). nominal To calibrate the quality, such as no load or rated load.

[0053] When superimposing the effects of the current driving slope, if the slope angle is set to α, and α is specified to be negative when the vehicle is going downhill and positive when the vehicle is going uphill, then when the vehicle is going downhill, due to the increased braking demand caused by the component of gravity along the slope, additional compensation is required, which can be expressed as:

[0054] F grade =m*g*sin(α)

[0055] Among them, F grade For the braking requirement compensated by gravity, m is the total mass of the vehicle (including load), g is the acceleration due to gravity, and α is the slope angle.

[0056] At this point, after superimposing the effects of slope and load, the braking demand can be achieved by adjusting F. grade With F loadThe results are obtained by adding them together. If the speed effect also needs to be considered, higher braking force is required due to the greater kinetic energy at high speeds. This can be adjusted using a dynamic coefficient. Specifically, the braking requirement after adding the speed effect can be calculated using the following formula:

[0057]

[0058] Where c and n are calibration parameters, F speed This refers to the braking demand after the influence of superimposed speed.

[0059] Based on this, restrictions can be added, such as the total braking force not exceeding the maximum friction between the tires and the ground.

[0060] F max =μ*m*g*cosα

[0061] Where μ is the coefficient of friction. After obtaining the maximum friction force, the braking demand can be normalized and converted into a percentage mode. When the braking demand is higher than a preset percentage threshold (e.g., 80%), it is considered that the vehicle needs to rely on the hydraulic retarder for assisted braking. In the following text, braking demand refers to the braking demand that needs to be braked by the hydraulic retarder, excluding the driving motor power.

[0062] Furthermore, after knowing the vehicle's braking requirements, when determining the operating parameters of the cooling module where the hydraulic sump is located, the expected hydraulic sump temperature corresponding to the first braking requirement can be determined based on a pre-calibrated hydraulic sump parameter table, so that the braking capacity of the hydraulic sump at the current moment can meet the braking requirements. Then, a first temperature difference between the current hydraulic sump temperature and the first expected hydraulic sump temperature can be determined, and multiple cooling schemes can be generated. Then, based on a first preset reward function and the temperature difference, a first cooling expectation value corresponding to each cooling scheme can be determined. Finally, based on the first cooling expectation value, the operating parameters of the cooling module corresponding to the target cooling scheme can be determined among multiple cooling schemes, where the operating parameters of the cooling module include the radiator power, water pump power, and multi-way valve opening at the current moment.

[0063] This section provides an example of the first preset reward function, which can include reward terms such as cooling efficiency reward, energy consumption penalty, and flow stability constraint. For instance, regarding the cooling efficiency reward, given that the heat dissipation capacity of the liquid buffer depends on the coolant flow rate and radiator efficiency, the objective is to minimize the difference between the coolant temperature and the desired temperature. Therefore, the cooling efficiency reward can be expressed as being related to the temperature difference after a very short time. After obtaining the first preset reward function, the operating parameters of the heat dissipation module can be determined based on the expected heat dissipation values ​​of different heat dissipation schemes under the first preset reward function.

[0064] In one embodiment, when determining the braking demand of a vehicle in a future time period, the current load and speed of the vehicle can be determined based on vehicle operating condition information, and road condition information for the future time period can be obtained, such as the road condition information of the road segments the vehicle will pass through in the next 20 seconds. Then, based on the current load and road condition information, the vehicle's operating mode for the future time period can be determined, such as a downhill load or urban commuting mode. And based on the current speed and operating mode, a second braking demand for the future time period can be predicted. Specifically, it can be determined whether the vehicle has a braking demand in the future time period, and the predicted speed value for the vehicle in the future time period can be determined, and then the braking demand for the vehicle in the future time period can be determined based on the vehicle's load and road condition information. The determination of the predicted speed value can be achieved through intelligent driving mode, which will not be elaborated further here.

[0065] When determining the operating parameters of the cooling module based on the vehicle's braking demand in the future time period, the method of determining the operating parameters of the cooling module can be referenced to the vehicle's braking demand in the current time period. However, the difference is that in addition to the braking demand in the future time period, it is also related to the braking start time and the expected hydraulic sump temperature. Therefore, the cooling module can dissipate heat in advance so that the temperature of the hydraulic sump can be reduced to the expected hydraulic sump temperature at the braking start time.

[0066] In one embodiment, a high ambient temperature may result in poor cooling performance when lowering the slicker temperature in advance, failing to reduce the slicker temperature to the expected temperature at the braking initiation point. In this case, the slicker temperature can be monitored at various time points while lowering it. If the difference between the actual slicker temperature and the expected slicker temperature at that time point exceeds a preset temperature difference, the operating parameters of the heat dissipation module are re-determined based on the preset temperature difference. This ensures efficient temperature reduction, allowing the slicker temperature to be lowered to the expected temperature before the braking initiation point.

[0067] In one embodiment, when considering whether the vehicle's braking demand meets the operating conditions of the hydraulic retarder, it is also necessary to assess factors that may affect the existing motor braking, such as ambient temperature and the current remaining battery power. It is understood that battery efficiency decreases in low-temperature environments, potentially weakening the motor's power output, while the hydraulic retarder is unaffected by temperature. Furthermore, forced energy recovery at full charge or low temperatures can lead to overcharging or damage, or even prevent energy recovery altogether, limiting braking power. Therefore, when determining whether the braking demand meets the hydraulic retarder's operating conditions, current environmental information and the vehicle's current remaining battery power can be obtained. Based on this information, an environmental braking demand value can be determined. For example, the quantified current environmental information and the current remaining battery power can be weighted and averaged to obtain the environmental braking demand value. If the environmental braking demand value exceeds a preset threshold, the vehicle is considered to meet the hydraulic retarder's operating conditions, and the hydraulic retarder is required for auxiliary braking to prevent damage to the motor or insufficient motor power.

[0068] Furthermore, when the ambient temperature is low, the vehicle needs to heat the battery pack to maintain its temperature within a suitable range. When the user requires air conditioning, the heat from the heater core also increases. Therefore, when the ambient temperature is low, the coolant flowing through the buffer can be redirected through the battery pack and / or heater core before flowing back to the radiator. This allows the high-temperature coolant to provide some heat to the battery pack and heater core, thereby reducing energy consumption.

[0069] like Figure 7 As shown in the illustration, this application also provides a vehicle control device, including:

[0070] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to:

[0071] Based on vehicle operating condition information, determine the vehicle's braking demand within a preset time period; based on the braking demand, determine whether the hydraulic retarder operating conditions are met; when the hydraulic retarder operating conditions are met, determine the heat dissipation module's operating parameters based on the braking demand; based on the heat dissipation module's operating parameters, control the heat dissipation module to dissipate heat.

[0072] This application embodiment also provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as follows:

[0073] Based on vehicle operating condition information, determine the vehicle's braking demand within a preset time period; based on the braking demand, determine whether the hydraulic retarder operating conditions are met; when the hydraulic retarder operating conditions are met, determine the heat dissipation module's operating parameters based on the braking demand; based on the heat dissipation module's operating parameters, control the heat dissipation module to dissipate heat.

[0074] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device and medium embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the description of the method embodiments.

[0075] The devices and media provided in this application are one-to-one with the methods. Therefore, the devices and media also have similar beneficial technical effects as their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0076] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0077] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxesFigure 1 The function specified in one or more boxes.

[0079] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0080] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0081] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0082] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0083] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A vehicle control method, characterized in that, The method is applied to pure electric vehicles, wherein the pure electric vehicles are equipped with a heat dissipation module, the heat dissipation module includes a radiator, a water pump, a liquid buffer, and coolant, the coolant flows out from the radiator, flows through the water pump and the liquid buffer, and then flows back to the radiator, the vehicle control method includes: Based on vehicle operating condition information, determine the vehicle's braking requirements within a preset time period; Based on the braking requirements, determine whether the working conditions of the hydraulic retarder are met. When the liquid buffer working conditions are met, the operating parameters of the heat dissipation module are determined based on the braking requirements; Based on the operating parameters of the heat dissipation module, the heat dissipation module is controlled to dissipate heat.

2. The method according to claim 1, characterized in that, The liquid buffer is connected in parallel with the drive motor. The heat dissipation module is also equipped with at least one multi-way valve. The multiple ends of the multi-way valve are respectively connected to the drive motor, the liquid buffer and the water pump, and are used to control the flow rate of the coolant flowing through the liquid buffer.

3. The method according to claim 2, characterized in that, The determination of the vehicle's braking requirements within a preset time period based on vehicle operating condition information specifically includes: Based on the vehicle operating condition information, determine the vehicle's current load, current speed, current driving gradient, and current brake pedal depth; Based on the vehicle's current load, current speed, current driving gradient, and current brake pedal depth, determine the vehicle's first braking demand at the current moment.

4. The method according to claim 3, characterized in that, The determination of the operating parameters of the heat dissipation module based on the braking requirements specifically includes: Based on the pre-calibrated hydraulic retarder parameter table, the expected hydraulic retarder temperature corresponding to the first braking demand is determined; Determine the first temperature difference between the current liquid buffer temperature and the first expected liquid buffer temperature, and generate multiple heat dissipation schemes; Based on the first preset reward function and the temperature difference, the first expected heat dissipation value corresponding to each heat dissipation scheme is determined; Based on the first heat dissipation expectation value, the heat dissipation module operating parameters corresponding to the target heat dissipation scheme are determined among the multiple heat dissipation schemes. The heat dissipation module operating parameters include the radiator power, water pump power, and multi-way valve opening at the current moment.

5. The method according to claim 2, characterized in that, The determination of the vehicle's braking requirements within a preset time period based on vehicle operating condition information specifically includes: Based on the vehicle operating condition information, the current load and speed of the vehicle are determined, and road condition information for future time periods is obtained. Based on the vehicle's current load and the road condition information, determine the vehicle's operating mode for the future time period; Based on the vehicle's current speed and operating mode, the second braking demand in the future time period is predicted.

6. The method according to claim 5, characterized in that, The determination of the operating parameters of the heat dissipation module based on the braking requirements specifically includes: Determine the braking start point of the vehicle in a future time period, and the second expected hydraulic retarder temperature corresponding to the second braking demand; Determine a second temperature difference between the current liquid buffer temperature and the second expected liquid buffer temperature; Based on the braking initiation point and the second temperature difference, a variety of early heat dissipation schemes are generated. Based on the second preset reward function, determine the second heat dissipation expectation value corresponding to each of the various early heat dissipation schemes; Based on the second heat dissipation expectation value, the operating parameters of the heat dissipation module corresponding to the target heat dissipation scheme are determined among the multiple advance heat dissipation schemes.

7. The method according to claim 6, characterized in that, The operating parameters of the heat dissipation module include the radiator power, water pump power and multi-way valve opening at each future time point. The step of controlling the heat dissipation module to dissipate heat based on the operating parameters of the heat dissipation module specifically includes: Based on the operating parameters of the heat dissipation module, the liquid buffer is cooled in advance.

8. The method according to claim 7, characterized in that, The step of pre-cooling the liquid buffer based on the operating parameters of the heat dissipation module specifically includes: During the cooling process of the liquid buffer, the actual temperature of the liquid buffer at each time point is determined, as well as the third expected liquid buffer temperature corresponding to the target preheating scheme. When the difference between the actual temperature of the liquid buffer and the third expected temperature of the liquid buffer is higher than the preset temperature difference, the operating parameters of the heat dissipation module are re-determined based on the preset temperature difference.

9. The method according to claim 1, characterized in that, The determination of whether the hydraulic retarder's operating conditions are met based on the braking requirements specifically includes: Obtain current environmental information and the vehicle's current remaining battery power; Based on the current environmental information and the current remaining battery power, determine the environmental braking demand value; When the environmental braking demand value is higher than the preset threshold, the working conditions of the liquid buffer are met.

10. The method according to claim 9, characterized in that, After controlling the heat dissipation module to dissipate heat based on the operating parameters of the heat dissipation module, the method further includes: It is determined that the ambient temperature in the environmental information is lower than a preset temperature threshold; The coolant flowing through the liquid buffer passes through the battery pack and / or the heater core and then flows back to the radiator.

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