Vehicle and control method and control device thereof

Abstract

The invention discloses a vehicle and a control method and a control device thereof. The method comprises the following steps: acquiring the required power of a whole vehicle, the heat production capacity and the heat dissipation capacity of the whole vehicle within a preset time, and the residual charge capacity and the temperature of a power battery; determining basic distribution power of the engine based on the residual charge quantity and the required power of the whole vehicle; under the condition that the whole vehicle heat production amount is larger than the whole vehicle heat dissipation amount or the temperature of the power battery is larger than a first preset temperature threshold value, the power of the power battery is limited to be a first preset power threshold value, the basic distribution power of the engine is adjusted based on the whole vehicle demand power and the first preset power threshold value, and the target power of the engine is obtained; and controlling the engine based on the engine target power. According to the control method, the power of the engine and the power of the power battery can be relatively balanced, uncontrollable temperature rise of a single assembly cannot be caused even if the load is continuously high, the good performance of the vehicle can be maintained for a long time, the cost is reduced, and the hardware heat dissipation capacity does not need to be upgraded by spending extra cost.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle control method, a vehicle and a vehicle control device. Background Art

[0002] At present, the energy management strategy of hybrid vehicles is based on pre-set rules. Different drivers use the same management strategy. Traditional algorithms cannot optimize the energy distribution strategy of a single vehicle. As a result, when the temperature of the vehicle's engine or power battery rises, the vehicle cannot be in the best performance state. In addition, related technologies have improved the problem of rising power battery or engine temperature by adding heat dissipation devices, but this method increases costs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a vehicle control method, by obtaining the vehicle demand power, the vehicle heat generation and the vehicle heat dissipation within a preset time, and the remaining charge and temperature of the power battery; determining the basic allocated power of the engine based on the remaining charge and the vehicle demand power; in the case where the vehicle heat generation is greater than the vehicle heat dissipation or the power battery temperature is greater than the first preset temperature threshold, limiting the power of the power battery to the first preset power threshold, and adjusting the basic allocated power of the engine based on the vehicle demand power and the first preset power threshold to obtain the engine target power; controlling the engine based on the engine target power, so that the engine power and the power battery power can be relatively balanced, and continuous high load will not cause the temperature of a single assembly to rise uncontrollably, so that the vehicle can maintain good performance for a long time, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0004] A second object of the present invention is to provide a vehicle.

[0005] A third object of the present invention is to provide a control device for a vehicle.

[0006] To achieve the above-mentioned objectives, a first aspect of an embodiment of the present invention proposes a vehicle control method, the method comprising: obtaining the required power of the whole vehicle, the heat generated by the whole vehicle and the heat dissipation of the whole vehicle within a preset time, and the remaining charge and temperature of the power battery; determining the basic allocated power of the engine based on the remaining charge and the required power of the whole vehicle; when the heat generated by the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than a first preset temperature threshold, limiting the power of the power battery to a first preset power threshold, and adjusting the basic allocated power of the engine based on the required power of the whole vehicle and the first preset power threshold to obtain the engine target power; and controlling the engine based on the engine target power.

[0007] According to the vehicle control method of the embodiment of the present invention, the vehicle power demand, the vehicle heat generation and heat dissipation within a preset time, and the remaining charge and temperature of the power battery are obtained; the basic allocated power of the engine is determined based on the remaining charge and the vehicle power demand; when the vehicle heat generation is greater than the vehicle heat dissipation or the power battery temperature is greater than the first preset temperature threshold, the power of the power battery is limited to the first preset power threshold, and the basic allocated power of the engine is adjusted based on the vehicle power demand and the first preset power threshold to obtain the engine target power; the engine is controlled based on the engine target power. As a result, the method can make the engine power and the power battery power relatively balanced, and continuous high load will not cause the temperature of a single assembly to rise uncontrollably, so that the vehicle can maintain good performance for a long time, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0008] In addition, the vehicle control method according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to one embodiment of the present invention, obtaining the vehicle power requirement includes: obtaining the driver power requirement and the high-voltage accessory power; and determining the vehicle power requirement based on the sum of the driver power requirement and the high-voltage accessory power.

[0010] According to one embodiment of the present invention, obtaining the driver required power includes: obtaining the current opening of the accelerator pedal; determining the driver required torque based on the maximum torque of the drive motor and the current opening; and determining the driver required power based on the driver required torque.

[0011] According to an embodiment of the present invention, obtaining the heat generation of the entire vehicle within a preset time includes: determining the heat generation of the entire vehicle based on a ratio of an integral of the driver demand torque within the preset time to the preset time.

[0012] According to one embodiment of the present invention, obtaining the heat dissipation of the whole vehicle within a preset time includes: obtaining the actual speed of the vehicle; determining the average speed based on the ratio of the integral of the actual speed within the preset time to the preset time; and determining the heat dissipation of the whole vehicle based on the average speed.

[0013] According to one embodiment of the present invention, determining the basic allocated power of the engine based on the remaining charge and the required power of the whole vehicle includes: determining the target charge and discharge power of the power battery; determining the engine power allocation ratio coefficient based on the remaining charge; determining the basic allocated power of the engine based on the product of the sum of the required power of the whole vehicle and the target charge and discharge power and the engine power allocation ratio coefficient.

[0014] According to one embodiment of the present invention, the basic allocated power of the engine is adjusted based on the vehicle demand power and the first preset power threshold to obtain the engine target power, including: taking the difference between the vehicle demand power and the first preset power threshold as the engine target power.

[0015] According to one embodiment of the present invention, the method further includes: acquiring the engine temperature; limiting the engine power to a second preset power threshold when the engine temperature is greater than a second preset temperature threshold; and using the second preset power threshold as the engine target power.

[0016] To achieve the above-mentioned purpose, a vehicle is proposed in a second aspect of an embodiment of the present invention, comprising a memory, a processor and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the above-mentioned vehicle control method is implemented.

[0017] According to the vehicle of the embodiment of the present invention, by executing the above-mentioned vehicle control method, the engine power and the power of the power battery can be relatively balanced, and continuous high load will not cause uncontrollable temperature rise of a single assembly, so that the vehicle can maintain good performance for a long time, and the cost is reduced without spending extra cost to upgrade the hardware heat dissipation capacity.

[0018] To achieve the above-mentioned purpose, the third aspect of the present invention proposes a vehicle control device, which includes: an acquisition module, which is used to obtain the required power of the whole vehicle, the heat generation and heat dissipation of the whole vehicle within a preset time, and the remaining charge and temperature of the power battery; a determination module, which is used to determine the basic allocated power of the engine based on the remaining charge and the required power of the whole vehicle; a correction module, which is used to limit the power of the power battery to a first preset power threshold when the heat generation of the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than a first preset temperature threshold, and adjust the basic allocated power of the engine based on the required power of the whole vehicle and the first preset power threshold to obtain the engine target power; a control module, which is used to control the engine based on the engine target power.

[0019] According to the vehicle control device of the embodiment of the present invention, the acquisition module is used to obtain the vehicle power demand, the vehicle heat generation and heat dissipation within a preset time, and the remaining charge and temperature of the power battery; the determination module is used to determine the basic allocated power of the engine based on the remaining charge and the vehicle power demand; the correction module is used to limit the power of the power battery to the first preset power threshold when the vehicle heat generation is greater than the vehicle heat dissipation or the temperature of the power battery is greater than the first preset temperature threshold, and adjust the basic allocated power of the engine based on the vehicle power demand and the first preset power threshold to obtain the engine target power; the control module is used to control the engine based on the engine target power. Thus, the device can make the engine power and the power battery power relatively balanced, and continuous high load will not cause the temperature of a single assembly to rise uncontrollably, so that the vehicle can maintain good performance for a long time, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a flow chart of a vehicle control method according to an embodiment of the present invention;

[0022] Figure 2 A flowchart of a vehicle control method according to a specific example of the present invention;

[0023] Figure 3 is a block diagram of a vehicle according to an embodiment of the present invention;

[0024] Figure 4 FIG. 4 is a block diagram of a control device for a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following describes a vehicle control method, a vehicle, and a vehicle control device according to embodiments of the present invention with reference to the accompanying drawings.

[0027] Figure 1 4 is a flow chart of a vehicle control method according to an embodiment of the present invention.

[0028] like Figure 1 As shown, the vehicle control method of the embodiment of the present invention may include the following steps:

[0029] S1, obtaining the required power of the vehicle, the heat generated by the vehicle and the heat dissipated by the vehicle within a preset time, and the remaining charge and temperature of the power battery. The preset time can be determined according to actual conditions.

[0030] S2, determining the basic distributed power of the engine based on the remaining charge and the required power of the vehicle.

[0031] S3: When the heat generated by the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than the first preset temperature threshold, the power of the power battery is limited to the first preset power threshold, and the basic allocated power of the engine is adjusted based on the required power of the whole vehicle and the first preset power threshold to obtain the target power of the engine.

[0032] S4, controlling the engine based on the target engine power.

[0033] Specifically, when controlling the engine, first obtain the vehicle's required power, the vehicle's heat generation and heat dissipation within a preset time, and the remaining charge and temperature of the power battery. For example, the vehicle's required power can be calculated based on the driver's driving needs (such as acceleration, maintaining speed, etc.) to obtain the total power required by the vehicle at the current moment. The preset time can be 60 seconds, and the heat generation of the vehicle within the preset time can be estimated by the vehicle's operating status (such as vehicle speed, driving mode, etc.) The total heat generated by each component of the vehicle (especially the power system components). Also within the preset time, the total heat that the vehicle can dissipate can be calculated based on the vehicle's cooling system design and current environmental conditions (such as vehicle speed, outside temperature, etc.). The remaining charge of the power battery is the percentage of the power currently remaining in the power battery, and the remaining charge and temperature can be obtained through the battery management system.

[0034] After obtaining the required power and remaining charge of the vehicle, the basic allocated power of the engine can be determined based on the remaining charge and the required power of the vehicle. When the remaining charge is high, the power battery can provide more power, and the engine can allocate less power at this time; conversely, when the remaining charge is low, in order to protect the battery from over-discharge, the engine needs to provide more power. Therefore, when determining the basic allocated power of the engine, it is necessary to combine the remaining charge and the required power of the vehicle. For example, it can be set that when the remaining charge is higher than a certain threshold, the basic power provided by the engine accounts for a lower proportion of the required power of the vehicle; when the remaining charge is lower than a certain threshold, the basic power provided by the engine accounts for a higher proportion of the required power of the vehicle.

[0035] After determining the basic power of the engine, the engine can be operated according to the power, and the power battery can be operated according to the power value obtained by subtracting the basic power of the engine from the power required by the vehicle. At this time, the power battery is running at a higher power. Long-term continuous output will cause the temperature of the power battery to continue to rise, resulting in poor vehicle performance or even vehicle failure. Therefore, when the temperature of the power battery is greater than the first preset temperature threshold, or the current heat generation of the whole vehicle is greater than the heat dissipation of the whole vehicle, it can be explained that the heat generated by the current vehicle is large and the temperature of the power battery is high. In order to ensure the operation of the whole vehicle and maintain good performance, the power of the power battery can be limited to limit the output power of the battery to a safe preset value, that is, the first preset power threshold. In other words, at this power, the temperature of the battery will not continue to rise, and the heat generation of the whole vehicle is not greater than the heat dissipation. At the same time, the basic allocated power of the engine is adjusted based on the required power of the whole vehicle and the first preset power threshold to obtain the target power of the engine. In other words, the reduced power of the power battery can be allocated to the engine to supplement the required power of the whole vehicle reduced due to limiting the battery power, so as to ensure that the vehicle can still meet the driving needs.

[0036] Therefore, after determining the target engine power, the engine can be controlled according to the target engine power. For example, the calculated engine power value can be converted into the target engine speed value and the target engine torque value, and the engine can be controlled to operate according to the target speed value and the target torque value. In this way, the vehicle can maintain good performance for a long time, greatly improve the driving experience, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0037] According to one embodiment of the present invention, obtaining the vehicle power requirement includes: obtaining the driver power requirement and the high-voltage accessory power; and determining the vehicle power requirement based on the sum of the driver power requirement and the high-voltage accessory power.

[0038] Specifically, when obtaining the required power of the whole vehicle, the driver's required power and the high-voltage accessory power can be obtained, wherein the driver's required power is calculated based on the driver's input (such as the position of the accelerator pedal), which reflects the driver's immediate demand for vehicle power. For example, it can be achieved through a preset function, which can output the corresponding driver's required power according to the position of the accelerator pedal. High-voltage accessory power refers to the sum of the power required by other devices powered by the high-voltage battery in addition to the vehicle's drive system. For example, it may include the air-conditioning system (power consumption of the air-conditioning compressor), the DC / DC (Direct Current to Direct Current) converter (power consumption for voltage conversion), and the heater (such as PTC (Positive Temperature Coefficient), power consumption for heating in the car). Real-time power consumption data can be obtained through the power sensor or controller of each accessory, and the power consumption of all high-voltage accessories can be added to obtain the total high-voltage accessory power.

[0039] After obtaining the driver's required power and high-voltage accessory power, the vehicle's required power can be determined based on the sum of the driver's required power and the high-voltage accessory power, that is, the vehicle's required power is the sum of the driver's required power and the high-voltage accessory power, so as to control the power distribution between the internal combustion engine and the electric motor according to the vehicle's required power to meet power requirements and optimize fuel efficiency and battery usage.

[0040] According to one embodiment of the present invention, obtaining the driver's required power includes: obtaining the current opening of the accelerator pedal; determining the driver's required torque based on the maximum torque and the current opening of the drive motor; and determining the driver's required power based on the driver's required torque.

[0041] Specifically, when obtaining the driver's required power, the current opening of the accelerator pedal can be obtained, for example, the current opening of the accelerator pedal can be obtained through the accelerator pedal position sensor. After obtaining the current opening of the accelerator pedal, the driver's required torque is determined according to the maximum torque of the drive motor and the current opening, such as determined by the formula: driver's required torque = (maximum torque / 100) * opening of the accelerator pedal. After determining the driver's required torque, the driver's required power can be determined according to the driver's required torque, for example, the driver's required power can be determined according to a predetermined corresponding relationship, that is, the driver's required torque and the driver's required power are in a one-to-one corresponding relationship. After determining the driver's required torque, the driver's required power can be determined according to the corresponding relationship. Or it can be achieved through a preset function, which can output the corresponding driver's required power according to the driver's required torque.

[0042] According to an embodiment of the present invention, obtaining the heat generation of the vehicle within a preset time includes: determining the heat generation of the vehicle based on the ratio of the integral of the driver's required torque within the preset time to the preset time. The preset time can be determined according to actual conditions.

[0043] Specifically, obtaining the heat generation of the whole vehicle within a preset time helps to evaluate and control the heat generated by the vehicle within a specific time, thereby ensuring that the vehicle operates at a temperature with optimal safety and efficiency. When obtaining the heat generation of the whole vehicle within a preset time, the heat generation of the whole vehicle can be determined based on the ratio of the integral of the driver's demand torque within the preset time to the preset time. For example, the preset time can be 60 seconds, that is, the data of the driver's demand torque is continuously sampled in the past 60 seconds, and the obtained driver's demand torque is integrated. Numerical integration methods such as the trapezoidal rule or the Simpson's rule can be used, and the calculation result is divided by the preset time to obtain the average heat generation as the heat generation of the whole vehicle.

[0044] According to an embodiment of the present invention, obtaining the heat dissipation of the whole vehicle within a preset time includes: obtaining the actual speed of the vehicle; determining the average speed based on the ratio of the integral of the actual speed within the preset time to the preset time; and determining the heat dissipation of the whole vehicle based on the average speed. The preset time can be determined according to actual conditions.

[0045] Specifically, when obtaining the heat dissipation of the whole vehicle within a preset time, the actual speed of the vehicle can be obtained, such as obtained by the speed sensor of the vehicle. After obtaining the actual speed, the average speed can be determined by integrating the actual speed within the preset time and calculating the ratio to the preset time. For example, the preset time can be 60 seconds, that is, in the past 60 seconds, the actual speed is continuously obtained, and the sampled speed data is integrated. The total driving distance can be obtained by using a numerical integration method, such as the trapezoidal rule or the Simpson's rule, and the total driving distance is divided by the preset time to obtain the average speed. Thus, based on the average speed, the heat dissipation of the whole vehicle during driving can be estimated. In other words, the heat dissipation is related to the speed because the vehicle dissipates heat through air flow while driving. For example, based on the design and test data of the vehicle, a heat dissipation model is predetermined, which describes the relationship between the speed and the heat dissipation. The heat dissipation of the whole vehicle is calculated using the heat dissipation model and the average speed. For example, the formula can be expressed as: heat dissipation of the whole vehicle = f (average speed), where f is a heat dissipation model function, which may include factors such as aerodynamic characteristics, vehicle surface area, and ambient temperature. In this way, the vehicle's heat dissipation status can be continuously monitored to ensure that the vehicle operates within a safe temperature range.

[0046] According to one embodiment of the present invention, the basic allocated power of the engine is determined based on the remaining charge and the required power of the whole vehicle, including: determining the target charge and discharge power of the power battery; determining the engine power allocation ratio coefficient based on the remaining charge; and determining the basic allocated power of the engine based on the product of the sum of the required power of the whole vehicle and the target charge and discharge power and the engine power allocation ratio coefficient.

[0047] Specifically, when the basic distributed power of the engine is determined according to the remaining charge and the required power of the vehicle, the target charge and discharge power of the power battery can be determined. The target charge and discharge power refers to the charge or discharge level that the battery should maintain under specific driving conditions in order to maintain the health of the battery and extend its life. In addition, a positive target charge and discharge power indicates a charging tendency, and a negative target charge and discharge power indicates a discharging tendency. It is obtained by actual vehicle calibration according to the battery status and driving requirements.

[0048] The engine power distribution ratio coefficient can be determined according to the remaining charge. For example, it can be implemented by a preset function, which can output the corresponding engine power distribution ratio coefficient according to the remaining charge. The engine power distribution ratio coefficient is negatively correlated with the remaining charge, that is, it decreases as the remaining charge increases, which means that when the battery is fully charged, more reliance can be placed on electric drive. After obtaining the engine power distribution ratio coefficient, the engine basic distribution power can be determined based on the product of the sum of the vehicle's required power and the target charge and discharge power and the engine power distribution ratio coefficient, that is, the sum of the vehicle's required power and the target charge and discharge power is multiplied by the engine power distribution ratio coefficient to obtain the engine basic distribution power. That is, the engine basic distribution power = (vehicle required power + target charge and discharge power) × engine power distribution ratio coefficient.

[0049] According to one embodiment of the present invention, the basic allocated power of the engine is adjusted based on the vehicle demand power and the first preset power threshold to obtain the engine target power, including: taking the difference between the vehicle demand power and the first preset power threshold as the engine target power.

[0050] Specifically, when the basic allocated power of the engine is adjusted based on the vehicle's required power and the first preset power threshold to obtain the engine's target power, the difference between the vehicle's required power and the first preset power threshold can be used as the engine's target power. That is, when it is determined that the power currently provided by the power battery is the first preset power threshold, in order to ensure balanced output of the power battery and the engine, the engine's target power can be the vehicle's required power minus the first preset power threshold.

[0051] According to an embodiment of the present invention, the vehicle control method further includes: obtaining the engine temperature; when the engine temperature is greater than a second preset temperature threshold, limiting the engine power to a second preset power threshold; and using the second preset power threshold as the engine target power. The second preset temperature threshold may be determined according to actual conditions, and the second preset power threshold may be determined according to actual conditions.

[0052] Specifically, during the operation of the vehicle, the engine temperature is monitored in real time. For example, the engine temperature can be measured by a temperature sensor installed in a key part of the engine (such as a cylinder, a coolant channel, etc.). After the engine temperature is obtained, it can be judged according to the size relationship between the engine temperature and the second preset temperature threshold, that is, the second preset temperature threshold is used to define the upper limit of the engine temperature exceeding the normal operating range. The setting of this threshold is based on the design parameters of the engine and the reliability test of long-term operation. When it is detected that the engine temperature exceeds the second preset temperature threshold, the power output of the engine can be reduced to reduce heat generation and prevent the engine from overheating. That is, the power of the engine can be limited to the second preset power threshold. The second preset power threshold is the maximum output power allowed for the engine to run when the engine temperature exceeds the safety threshold. The setting of this threshold is intended to reduce the thermal load of the engine while still maintaining the basic operating requirements of the vehicle. Therefore, when the engine temperature is high, the second preset power threshold can be used as the engine target power to ensure the safe operation of the engine while optimizing the performance and fuel efficiency of the vehicle.

[0053] In summary, as a specific example, it is assumed that the engine heat dissipation power boundary is 60kw (the second preset power threshold) under the current vehicle speed condition, and the power battery heat dissipation power boundary is 40kw (the first preset power threshold). When the remaining charge of the power battery is high, such as the remaining charge is 80%, the discharge is given priority at this time. When the vehicle demand power is determined to be 80kw according to the sum of the driver's demand power and the high-voltage accessory power, the basic distribution power of the engine is determined to be 20kw according to the product of the sum of the vehicle demand power and the target charge and discharge power and the engine power distribution ratio coefficient, then the basic distribution power of the power battery can be determined to be 60kw. With the use of the power battery, the remaining charge is getting lower and lower, and the higher the basic distribution power of the engine, the larger the power of the power battery is at this time. Long-term continuous output will cause the power battery to overheat and cause the vehicle performance to deteriorate, and even cause assembly failure. Therefore, the power of the power battery can be controlled to be reduced to the first preset power threshold of 40kw, and the basic power of the engine can be controlled to be increased to 40kw, so that the engine power and the power battery power are relatively balanced, and continuous high load will not cause the temperature of the single assembly to rise uncontrollably, and the vehicle will maintain good performance for a long time. And there is no need to spend extra cost to upgrade the hardware cooling capacity, thus reducing costs.

[0054] Combine the following Figure 2 The control method of the present invention will be described.

[0055] As a specific example, the vehicle control method of the present invention may include the following steps:

[0056] S101, obtaining the driver's required power, high-voltage accessory power, driver's required torque, the vehicle's actual speed, the remaining charge of the power battery, the temperature, and the target charge and discharge power.

[0057] S102, determining the vehicle's required power based on the sum of the driver's required power and the high-voltage accessory power, determining the vehicle's heat generation based on the ratio of the integral of the driver's required torque within the preset time to the preset time, and determining the average vehicle speed based on the ratio of the integral of the actual vehicle speed within the preset time to the preset time, and determining the vehicle's heat dissipation based on the average vehicle speed.

[0058] S103: determining an engine power distribution ratio coefficient based on the remaining charge.

[0059] S104: determining the basic allocated power of the engine based on the product of the sum of the vehicle required power and the target charging and discharging power and the engine power allocation ratio coefficient.

[0060] S105, determining whether the heat generated by the vehicle is greater than the heat dissipated by the vehicle or whether the temperature of the power battery is greater than a first preset temperature threshold. If yes, execute step S106; if no, execute step S109.

[0061] S106: Limiting the power of the power battery to a first preset power threshold.

[0062] S107: Taking the difference between the vehicle required power and the first preset power threshold as the engine target power.

[0063] S108, controlling the engine based on the engine target power.

[0064] S109, determining whether the temperature of the engine is greater than a second preset temperature threshold. If yes, executing step S110; if no, executing step S104.

[0065] S110: Limiting the power of the engine to a second preset power threshold, and taking the second preset power threshold as the target power of the engine.

[0066] In summary, according to the vehicle control method of the embodiment of the present invention, the vehicle demand power, the vehicle heat generation and vehicle heat dissipation within a preset time, and the remaining charge and temperature of the power battery are obtained; the basic allocated power of the engine is determined based on the remaining charge and the vehicle demand power; when the vehicle heat generation is greater than the vehicle heat dissipation or the power battery temperature is greater than the first preset temperature threshold, the power of the power battery is limited to the first preset power threshold, and the basic allocated power of the engine is adjusted based on the vehicle demand power and the first preset power threshold to obtain the engine target power; the engine is controlled based on the engine target power. As a result, the method can make the engine power and the power battery power relatively balanced, and continuous high load will not cause the temperature of a single assembly to rise uncontrollably, so that the vehicle can maintain good performance for a long time, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0067] Corresponding to the above embodiment, the present invention also provides a vehicle.

[0068] like Figure 3 As shown, the vehicle 200 of the embodiment of the present invention may include: a memory 210, a processor 220, and a program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the program, the above-mentioned vehicle control method is implemented.

[0069] According to the vehicle of the embodiment of the present invention, by executing the above-mentioned vehicle control method, the engine power and the power of the power battery can be relatively balanced, and continuous high load will not cause uncontrollable temperature rise of a single assembly, so that the vehicle can maintain good performance for a long time, and the cost is reduced without spending extra cost to upgrade the hardware heat dissipation capacity.

[0070] Corresponding to the above embodiment, the present invention also proposes a vehicle control device.

[0071] like Figure 4 As shown, the vehicle control device 100 according to the embodiment of the present invention includes: an acquisition module 110 , a determination module 120 , a correction module 130 and a control module 140 .

[0072] Among them, the acquisition module 110 is used to obtain the required power of the whole vehicle, the heat generated by the whole vehicle within a preset time, the heat dissipation of the whole vehicle, and the remaining charge and temperature of the power battery. The determination module 120 is used to determine the basic allocated power of the engine based on the remaining charge and the required power of the whole vehicle. The correction module 130 is used to limit the power of the power battery to the first preset power threshold when the heat generated by the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than the first preset temperature threshold, and adjust the basic allocated power of the engine based on the required power of the whole vehicle and the first preset power threshold to obtain the target power of the engine. The control module 140 is used to control the engine based on the target power of the engine.

[0073] According to one embodiment of the present invention, the acquisition module 110 acquires the vehicle power requirement, specifically for: acquiring the driver power requirement and the high-voltage accessory power; and determining the vehicle power requirement based on the sum of the driver power requirement and the high-voltage accessory power.

[0074] According to one embodiment of the present invention, the acquisition module 110 acquires the driver's required power, specifically for: acquiring the current opening of the accelerator pedal; determining the driver's required torque based on the maximum torque and the current opening of the drive motor; and determining the driver's required power based on the driver's required torque.

[0075] According to an embodiment of the present invention, the acquisition module 110 acquires the heat generation of the whole vehicle within a preset time, specifically for determining the heat generation of the whole vehicle based on the ratio of the integral of the driver's required torque within the preset time to the preset time.

[0076] According to one embodiment of the present invention, the acquisition module 110 acquires the heat dissipation of the whole vehicle within a preset time, and is specifically used to: acquire the actual speed of the vehicle; determine the average speed based on the ratio of the integral of the actual speed within the preset time to the preset time; and determine the heat dissipation of the whole vehicle based on the average speed.

[0077] According to one embodiment of the present invention, the determination module 120 determines the basic allocated power of the engine based on the remaining charge and the required power of the whole vehicle, and is specifically used to: determine the target charge and discharge power of the power battery; determine the engine power allocation ratio coefficient based on the remaining charge; determine the basic allocated power of the engine based on the product of the sum of the required power of the whole vehicle and the target charge and discharge power and the engine power allocation ratio coefficient.

[0078] According to one embodiment of the present invention, the correction module 130 adjusts the basic allocated power of the engine based on the vehicle demand power and the first preset power threshold to obtain the engine target power, which is specifically used to: use the difference between the vehicle demand power and the first preset power threshold as the engine target power.

[0079] According to one embodiment of the present invention, the correction module 130 is further used to: obtain the engine temperature; when the engine temperature is greater than a second preset temperature threshold, limit the engine power to a second preset power threshold; and use the second preset power threshold as the engine target power.

[0080] It should be noted that for details not disclosed in the vehicle control device of the embodiment of the present invention, please refer to the details disclosed in the vehicle control method of the embodiment of the present invention, and the details will not be repeated here.

[0081] According to the vehicle control device of the embodiment of the present invention, the acquisition module is used to obtain the vehicle power demand, the vehicle heat generation and heat dissipation within a preset time, and the remaining charge and temperature of the power battery; the determination module is used to determine the basic allocated power of the engine based on the remaining charge and the vehicle power demand; the correction module is used to limit the power of the power battery to the first preset power threshold when the vehicle heat generation is greater than the vehicle heat dissipation or the temperature of the power battery is greater than the first preset temperature threshold, and adjust the basic allocated power of the engine based on the vehicle power demand and the first preset power threshold to obtain the engine target power; the control module is used to control the engine based on the engine target power. Thus, the device can make the engine power and the power battery power relatively balanced, and continuous high load will not cause the temperature of a single assembly to rise uncontrollably, so that the vehicle can maintain good performance for a long time, and reduce costs without spending extra costs to upgrade the hardware heat dissipation capacity.

[0082] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0083] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A vehicle control method, characterized in that: The method comprises: Obtain the vehicle's required power, the vehicle's heat generation and heat dissipation within a preset time, and the remaining charge and temperature of the power battery; Determining the basic distributed power of the engine based on the remaining charge and the required power of the whole vehicle; When the heat generated by the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than a first preset temperature threshold, limiting the power of the power battery to a first preset power threshold, and adjusting the basic allocated power of the engine based on the required power of the whole vehicle and the first preset power threshold to obtain a target power of the engine; The engine is controlled based on the engine target power.

2. The vehicle control method according to claim 1, characterized in that: The obtaining of the vehicle required power includes: Obtain the driver's required power and high-voltage accessory power; The vehicle required power is determined based on the sum of the driver required power and the high-voltage accessory power.

3. The vehicle control method according to claim 2, characterized in that: The obtaining of the driver's required power includes: Get the current opening of the accelerator pedal; determining a driver demand torque based on the maximum torque of the drive motor and the current opening degree; The driver requested power is determined based on the driver requested torque.

4. The vehicle control method according to claim 3, characterized in that: The obtaining of the heat output of the vehicle within a preset time includes: The total vehicle heat generation is determined based on a ratio of an integral of the driver demand torque within the preset time to the preset time.

5. The vehicle control method according to claim 1, characterized in that: The obtaining of the heat dissipation of the vehicle within a preset time includes: Obtaining the actual speed of the vehicle; Determining an average vehicle speed based on a ratio of an integral of the actual vehicle speed within the preset time to the preset time; The heat dissipation of the entire vehicle is determined based on the average vehicle speed.

6. The vehicle control method according to claim 1, characterized in that: The determining of the basic distributed power of the engine based on the remaining charge and the required power of the whole vehicle includes: Determine the target charge and discharge power of the power battery; Determining an engine power distribution ratio coefficient based on the remaining charge; The basic allocated power of the engine is determined based on the product of the sum of the vehicle required power and the target charging and discharging power and the engine power allocation ratio coefficient.

7. The vehicle control method according to claim 1, characterized in that: The adjusting the basic allocated power of the engine based on the vehicle required power and the first preset power threshold to obtain the target power of the engine includes: The difference between the vehicle required power and the first preset power threshold is used as the engine target power.

8. The vehicle control method according to claim 1, characterized in that: The method further comprises: Get engine temperature; When the engine temperature is greater than a second preset temperature threshold, limiting the engine power to a second preset power threshold; The second preset power threshold is used as the engine target power.

9. A vehicle, characterized in that: include: A memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, a vehicle control method according to any one of claims 1 to 8 is implemented.

10. A vehicle control device, characterized in that: The device comprises: An acquisition module is used to obtain the required power of the vehicle, the heat generated by the vehicle and the heat dissipated by the vehicle within a preset time, and the remaining charge and temperature of the power battery; A determination module, configured to determine a basic allocated power of the engine based on the remaining charge and the required power of the entire vehicle; a correction module, configured to limit the power of the power battery to a first preset power threshold value when the heat generated by the whole vehicle is greater than the heat dissipation of the whole vehicle or the temperature of the power battery is greater than a first preset temperature threshold value, and adjust the basic allocated power of the engine based on the required power of the whole vehicle and the first preset power threshold value to obtain a target power of the engine; A control module is used to control the engine based on the engine target power.

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