Whole vehicle discharge limited power determination method and device and vehicle-mounted terminal

Abstract

The invention provides a whole vehicle discharge limited power determination method and device and a vehicle-mounted terminal. The method comprises the steps that the working state of a range extender of a vehicle, the generated power of the range extender, the available power of a battery and the pure electricity remaining endurance mileage are obtained; if the working state of the range extender is a closed state, the whole vehicle discharge limiting power is determined according to the pure electricity remaining endurance mileage and the battery available power; if the working state of the range extender is an on state, determining the discharge limit power of the whole vehicle according to the pure electric remaining endurance mileage, the generated power of the range extender and the available power of the battery; the whole vehicle discharge limiting power under different working states of the range extender is determined through the remaining endurance mileage of the vehicle, the generated power of the range extender and the available power of the battery, energy management can be carried out based on dynamic endurance and the real-time state of the vehicle, and the battery health is protected; and in the energy management process, it is ensured that the dynamic property and comfort of the vehicle are not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of energy management, and in particular to a method and device for determining a discharge limit power of a whole vehicle, and a vehicle-mounted terminal. Background Art

[0002] With the development of intelligent technology, the energy management methods of automobiles are also constantly being innovated. Extended-range vehicles combine the characteristics of pure electric vehicles and traditional internal combustion engine vehicles, and extend the cruising range by generating electricity through internal combustion engines. Therefore, for extended-range vehicles, it is necessary to comprehensively consider the impact of internal combustion engine power generation and pure electric cruising range on energy management.

[0003] The current energy management rules for extended-range vehicles are based on the vehicle's SOC (State of Charge), and usually adopt a fixed energy management method, such as starting the internal combustion engine to generate electricity when the SOC is low, or giving priority to using battery energy when the SOC is high. This mode cannot be adjusted intelligently in combination with the vehicle's energy consumption, which may result in the vehicle's discharge limit power being unable to meet vehicle needs or a decline in user experience. The vehicle's discharge limit power cannot be dynamically adjusted according to the remaining pure electric range and the battery's available power, so that the vehicle's power is released smoothly without an obvious sense of sudden power changes. Secondly, this fixed energy management method is often static, and does not take into account the impact of real-time road conditions, driving behavior, ambient temperature and other factors on energy consumption. It does not meet the user's vehicle usage scenarios, has a low reference value in cold areas, is not conducive to protecting battery health, and reduces the vehicle's power, economy, and comfort. Summary of the invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a method, device and vehicle-mounted terminal for determining the discharge limit power of a whole vehicle that overcome the above problems or at least partially solve the above problems.

[0005] According to a first aspect of the present invention, a method for determining a vehicle discharge limit power is provided, the method comprising: Obtain the vehicle's range extender operating status, range extender power generation, battery available power, and remaining pure electric range; If the range extender is in the off state, the vehicle discharge limit power is determined according to the remaining pure electric range and the available power of the battery; If the range extender is in the on state, the vehicle discharge limit power is determined according to the remaining pure electric range, the power generation power of the range extender and the available power of the battery.

[0006] Optionally, determining the vehicle discharge limit power according to the remaining pure electric cruising range and the battery available power includes: determining a first target parameter according to the remaining pure electric cruising range, the battery available power, and a first mapping relationship, wherein the first mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the battery available power, and the first target parameter; The vehicle discharge limit power is determined according to the first target parameter.

[0007] Optionally, determining the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power includes: Determining a second target parameter according to the remaining pure electric cruising range, the power generation power of the range extender, and a second mapping relationship, wherein the second mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the power generation power of the range extender, and the second target parameter; The vehicle discharge limit power is determined according to the first target parameter, the second target parameter and the range extender power generation power.

[0008] Optionally, the method further comprises: Obtaining a difference between the vehicle discharge limit power and the reserved power to obtain a target difference, wherein the reserved power is determined according to the working state of the range extender; The thermal management limit power is determined according to the target difference, the remaining pure electric cruising range and a third mapping relationship, wherein the third mapping relationship is used to indicate the relationship between the remaining pure electric cruising range, the target difference and the thermal management limit power.

[0009] Optionally, the method further comprises: Get the remaining battery power and average power consumption; The remaining pure electric range is determined based on the remaining battery power and the average power consumption.

[0010] Optionally, the method further comprises: Obtain the historical range extender power generation of each cycle, the historical battery actual power of each cycle and the total mileage of the vehicle; The average power consumption is obtained according to the historical range extender generated power, the historical battery actual power and the total mileage of the vehicle.

[0011] Optionally, the average power consumption is obtained according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle, including: Obtaining a first power consumption according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle; Obtaining a second power consumption according to the mileage range of the total mileage of the vehicle; The average power consumption is determined according to the first power consumption and / or the second power consumption.

[0012] Optionally, the method further comprises: Determining a power alarm level according to the remaining pure electric range and a preset power level; The vehicle discharge limit power is modified according to the power alarm level.

[0013] According to a second aspect of the present invention, a device for determining a vehicle discharge limit power is provided, the device comprising: A data acquisition module is used to obtain the vehicle's range extender operating status, range extender power generation, battery available power, and pure electric remaining range; A module for determining the discharge limit power of the whole vehicle when the range extender is turned off, for determining the discharge limit power of the whole vehicle according to the remaining pure electric cruising range and the available power of the battery if the working state of the range extender is turned off; The range extender is turned on and the vehicle discharge limit power determination module is used to determine the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power if the range extender is in the turned on state.

[0014] According to the third aspect of the present invention, a vehicle-mounted terminal is provided, which includes: a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the steps of the above-mentioned method for determining the vehicle discharge limit power.

[0015] The embodiments of the present invention include the following advantages: In an embodiment of the present invention, the working state of the range extender, the power generation power of the range extender, the available power of the battery and the remaining pure electric cruising range of the vehicle are obtained; if the working state of the range extender is in the off state, the discharge limit power of the whole vehicle is determined according to the remaining pure electric cruising range and the available power of the battery; if the working state of the range extender is in the on state, the discharge limit power of the whole vehicle is determined according to the remaining pure electric cruising range, the power generation power of the range extender and the available power of the battery; the discharge limit power of the whole vehicle under different working states of the range extender is determined by the remaining cruising range of the vehicle, the power generation power of the range extender and the available power of the battery, and energy management can be performed based on dynamic cruising range and the real-time state of the vehicle, which is beneficial to protecting the health of the battery and ensuring that the vehicle's power and comfort are not affected during the energy management process.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a flowchart of the steps of an embodiment of a method for determining a vehicle discharge limit power according to the present invention; Figure 2 It is a structural block diagram of an embodiment of a device for determining a vehicle discharge limit power according to the present invention.

[0019] Reference numerals: 201 - data acquisition module, 202 - vehicle discharge limit power determination module when the range extender is turned off, 203 - vehicle discharge limit power determination module when the range extender is turned on. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0021] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0022] In conjunction with the accompanying drawings, a method and system for determining a vehicle discharge limit power provided by an embodiment of the present invention will be described in detail through specific embodiments and application scenarios.

[0023] With the development of intelligent technology, the energy management methods of automobiles are also constantly being innovated. Extended-range vehicles combine the characteristics of pure electric vehicles and traditional internal combustion engine vehicles, and extend the cruising range by generating electricity through internal combustion engines. Therefore, for extended-range vehicles, it is necessary to comprehensively consider the impact of internal combustion engine power generation and pure electric cruising range on energy management.

[0024] The current energy management rules for extended-range vehicles are based on the vehicle's SOC (State of Charge), and usually adopt a fixed energy management method, such as starting the internal combustion engine to generate electricity when the SOC is low, or giving priority to battery energy when the SOC is high. This mode cannot be adjusted intelligently in combination with the vehicle's energy consumption, which may cause the vehicle's discharge limit power to be unable to meet vehicle needs or reduce user experience. It cannot dynamically adjust the vehicle's discharge limit power according to the remaining pure electric range and the battery's available power, so that the vehicle's power is released smoothly without obvious power mutations. Secondly, this fixed energy management method is often static and does not take into account the impact of real-time road conditions, driving behavior, ambient temperature and other factors on energy consumption. It does not conform to the user's vehicle usage scenarios, has a low reference value in cold areas, is not conducive to protecting battery health, and reduces vehicle power, economy, and comfort.

[0025] The embodiment of the present invention can avoid abuse of permissions and systems by setting corresponding vehicle search permissions through application information, and all vehicle control instructions are end-to-end encrypted to ensure the security of operations.

[0026] Reference Figure 1 , shows a flowchart of a method for determining a vehicle discharge limit power according to an embodiment of the present invention, which may specifically include the following steps: Step 101, obtaining the vehicle's range extender operating status, range extender power generation, battery available power, and pure electric remaining range; In the embodiment of the present invention, the GCU (Generator Control Unit) current and GCU voltage can be obtained from the range extender control system, that is, and When the range extender is generating electricity, the GCU current is positive, so it can be Determine the working status of the range extender by and Calculate the range extender power generation , that is, the power generation of the range extender Among them, when When it is greater than 0, the range extender is in the on state; when When it is equal to 0, the range extender is in the off state; The available battery power can be obtained from the BMS (Battery Management System) , the current and voltage of the battery management system, that is, and ,pass and Calculate the actual battery power , that is , where: Since BMS usually introduces a safety margin to ensure that the battery operates within a safe range, the battery available power The actual battery power are not equal, the battery available power It is the maximum power that the battery can safely release under specific conditions (such as current SOC, temperature, health status, etc.). The actual power of the battery It is the actual output power of the battery calculated based on the current and voltage of the battery management system at the current moment. The historical actual battery power is calculated, that is, the actual battery power at each moment. The average power consumption of the vehicle can be determined; the remaining pure electric range It can be determined based on the SOE (State Of Energy) in the BMS and the average power consumption of the vehicle.

[0027] In this embodiment, after the range extender working state is obtained, it is determined whether the range extender working state is an off state or an on state. If the range extender working state is an off state, step 102 is executed; if the range extender working state is an on state, step 103 is executed.

[0028] Step 102, if the range extender is in the off state, determining the vehicle discharge limit power according to the remaining pure electric range and the battery available power; In this embodiment, if the range extender is in the off state, the remaining pure electric range can be and battery available power Determine the vehicle discharge limit power .

[0029] Step 103: If the range extender is in the on state, the vehicle discharge limit power is determined according to the remaining pure electric range, the power generated by the range extender and the available power of the battery.

[0030] In this embodiment, if the range extender is in the on state, the remaining pure electric range is , range extender power generation and battery available power Determine the vehicle discharge limit power .

[0031] In actual application, because the range extender has been started, the vehicle is in the range extender power generation state. Power can be generated by the range extender , Battery available power And remaining pure electric range Calculate the vehicle discharge limit power corresponding to the range extender in the on state Energy management based on dynamic endurance and the real-time status of the vehicle is beneficial to protecting battery health and ensuring that the vehicle's power and comfort are not affected during the process of determining the vehicle's discharge limit power.

[0032] A method for determining a vehicle discharge limit power provided by an embodiment of the present invention obtains the vehicle's range extender operating state, range extender power generation, battery available power and pure electric remaining cruising range; if the range extender operating state is an off state, the vehicle discharge limit power is determined based on the pure electric remaining cruising range and the battery available power; if the range extender operating state is an on state, the vehicle discharge limit power is determined based on the pure electric remaining cruising range, range extender power generation and battery available power; the vehicle discharge limit power under different range extender operating states is determined by the vehicle's remaining cruising range, range extender power generation and battery available power, and energy management can be performed based on dynamic cruising range and the real-time state of the vehicle, which is beneficial to protecting battery health and ensuring that the vehicle's power and comfort are not affected during energy management.

[0033] In one embodiment of the present invention, determining the vehicle discharge limit power according to the remaining pure electric cruising range and the battery available power includes: determining a first target parameter according to the remaining pure electric cruising range, the battery available power, and a first mapping relationship, wherein the first mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the battery available power, and the first target parameter; The vehicle discharge limit power is determined according to the first target parameter.

[0034] In the embodiment of the present invention, when the range extender is in the off state, the remaining pure electric range can be determined according to the first mapping relationship. and battery available power The first target parameter that matches the vehicle discharge limit power is obtained according to the first target parameter. .

[0035] The first mapping relationship may be a relationship between the remaining pure electric range, the available battery power, and the first target parameter that is pre-calibrated based on the correlation between the remaining pure electric range, the available battery power, and the first target parameter. The first mapping relationship is calibrated in a manner including, but not limited to, ensuring that the first target parameter is ≥ the battery thermal management required power and the reserved power under different remaining pure electric ranges and different available battery powers. The first target parameter increases with the remaining pure electric range and the available battery power, and the power is released smoothly without obvious power mutation. Among them: the battery thermal management required power can be received by the CCU (Cooling Control Unit) of the thermal management system and the PTC (Positive Temperature Coefficient) heating component to maintain the battery temperature, so that the battery can be charged and discharged normally at the lowest power, that is, the battery thermal management required power; the reserved power Including the power setting to keep the DCDC converter working normally as the first reserved power and the second reserved power for starting the range extender In the first mapping relationship, the greater the remaining pure electric range, the greater the first target parameter, and the greater the battery available power, the greater the first target parameter. As an exemplary embodiment, the first mapping relationship can be Table 1, where the horizontal axis of Table 1 represents the battery available power , the vertical axis represents the remaining pure electric range , the table lookup value is the first target parameter a. For example, the first mapping relationship may be shown in Table 1 below:

[0036] In Table 1, you can look up the remaining pure electric range of the current vehicle by looking up the table. and battery available power The first target parameter a that matches.

[0037] In one embodiment, when the range extender is in the off state, because the range extender is not started at this time, only the vehicle discharge limit power in the battery discharge scenario is available, so the first target parameter can be set to the vehicle discharge power, that is, the implementation method of determining the vehicle discharge limit power according to the first target parameter can be the vehicle discharge limit power. .

[0038] Specifically, in Table 1, combined with the strategy of charging reminder based on pure electric remaining cruising range, when the pure electric remaining cruising range is greater than 10km and less than 20km, the vehicle discharge limit power is limited. , to avoid the battery power from decreasing too quickly; when the remaining pure electric range is less than 3km, the vehicle discharge power limit is strictly limited , avoid over-discharge of the battery pack; when the remaining pure electric range is greater than 3km and less than 10km, perform discharge power transition.

[0039] In one embodiment of the present invention, determining the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power includes: Determining a second target parameter according to the remaining pure electric cruising range, the power generation power of the range extender, and a second mapping relationship, wherein the second mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the power generation power of the range extender, and the second target parameter; The vehicle discharge limit power is determined according to the first target parameter, the second target parameter and the range extender power generation power.

[0040] In the embodiment of the present invention, when the range extender is in the on state, the remaining pure electric range can be determined according to the second mapping relationship. And range extender power generation The second target parameter is set to match the power generation power of the range extender. The purpose of setting the second target parameter is to reserve power for charging the battery pack to avoid the battery pack being too low or the power being reduced too quickly. Get the vehicle discharge limit power required when the range extender is in the on state .

[0041] Among them, the above-mentioned second mapping relationship can be the relationship between the range extender power generation power, the pure electric remaining cruising range and the second target parameter, which is pre-calibrated based on the correlation between the range extender power generation power, the pure electric remaining cruising range and the second target parameter. Then, after determining the second target parameter according to the second mapping relationship, the vehicle discharge limit power is calculated by combining the first target parameter and the range extender power generation power. , that is: .

[0042] The method of calibrating the second mapping relationship includes, but is not limited to, different battery available powers under different pure electric remaining ranges to ensure the final vehicle discharge limit power ≥Battery thermal management required power and reserved power The sum of the vehicle discharge limit power As the remaining pure electric range is released, the power is released smoothly, and there will be no obvious power mutation. In the second mapping relationship, the greater the remaining pure electric range, the smaller the second target parameter, the greater the range extender power generation, and the greater the second target parameter. As an exemplary embodiment, the second mapping relationship can be Table 2, where the horizontal axis of Table 2 represents the range extender power generation. , the vertical axis represents the remaining pure electric range , the table lookup value is the second target parameter b. For example, the second mapping relationship may be as shown in Table 2 below:

[0043] In Table 2, you can find the remaining pure electric range of the current vehicle. And range extender power generation The second target parameter b is matched, wherein the range extender power generation The purpose of dividing by 1000 is to keep the unit of the first target parameter a consistent, so that the unit of the second target parameter b is kilowatt (kW); the purpose of setting the second target parameter b is to reserve power for charging the battery pack to avoid the battery pack being too low or the power dropping too fast to damage the battery health. After determining the second target parameter b, Calculate the vehicle discharge limit power when the range extender is in the on state .

[0044] in, is the vehicle discharge limit power, in kW; a is the first target parameter obtained according to the first mapping relationship, in kW; is the GCU current and GCU voltage obtained from the range extender control system, that is, and ,pass and Calculate the range extender power generation , the unit is W; b is the second target parameter obtained according to the second mapping relationship, the unit is kW.

[0045] Specifically, in Table 2, the strategy of charging reminder based on the remaining pure electric range is also combined, and the remaining pure electric range is When the range is greater than 20km, the range extender will release its power; when the remaining range is pure electric, When the range is less than 3km, more power generation capacity of the range extender is reserved for fast charging of the battery. Under different remaining pure electric ranges, the second target parameter b is restricted to different degrees, and different power generation capacities of the range extender are reserved to ensure that as the remaining pure electric range increases smoothly, the vehicle's power is smoothly released while ensuring the health of the battery, and there will be no obvious sense of power mutation.

[0046] In one embodiment of the present invention, the method further comprises: Obtaining a difference between the vehicle discharge limit power and the reserved power to obtain a target difference, wherein the reserved power is determined according to the working state of the range extender; The thermal management limit power is determined according to the target difference, the remaining pure electric cruising range and a third mapping relationship, wherein the third mapping relationship is used to indicate the relationship between the remaining pure electric cruising range, the target difference and the thermal management limit power.

[0047] In the embodiment of the present invention, the reserved power At least the first reserved power and the second reserved power , that is .

[0048] Specifically, in a range extender vehicle, the DCDC converter is one of the core components of the vehicle's electrical system. It is responsible for coordinating the energy transmission between the high-voltage battery pack and the low-voltage electrical equipment, and for managing the energy conversion between the high-voltage battery pack and the low-voltage electrical system. It is used to convert the voltage of the high-voltage battery pack (usually 300V-400V) into the voltage required by the low-voltage system (usually 12V or 24V). Therefore, it is closely related to the power supply of the vehicle equipment. Therefore, the DCDC converter is a prerequisite for ensuring the normal operation of the controller. Running the DCDC converter is a necessary condition for the operation of the vehicle. Therefore, the power to maintain the normal operation of the DCDC converter is set as the first reserved power. .

[0049] Secondly, since a certain amount of energy is consumed when the range extender is started, in the embodiment of the present invention, the power reserved for starting the range extender is set to the second reserved power The starting power of the range extender depends on factors such as the range extender type, the range extender working state, the ambient temperature and the battery state.

[0050] Optionally, the first reserved power Set to 1kW, the second reserved power When the range extender is in the off state, it is set to 0kW; when the range extender is in the on state, it is set to 2kW, where the first reserved power and the second reserved power The power can be adjusted according to the range extender type, ambient temperature, battery status, vehicle status settings and the needs of the DCDC controller, and the present invention is not limited to this.

[0051] Determine the second reserved power according to the working state of the range extender After that, the preset first reserved power Get reserved power , combined with the vehicle discharge limit power calculated based on the range extender working status, range extender power generation, battery available power and pure electric remaining range , the vehicle discharge limit power can be calculated With reserved power The difference is taken as the target difference, that is, the target difference = , and then according to the target difference , remaining pure electric range And the third mapping relationship to determine the thermal management limit power , to ensure the remaining range of pure electric vehicles at different , Available power of different batteries In the case of Can meet thermal management power limits , the first reserved power and the second reserved power Power, to avoid the situation where the battery thermal management cannot be met and the power value required to start the range extender is insufficient, so that the range extender cannot be started even with oil, causing the risk of battery thermal runaway.

[0052] The third mapping relationship may be a relationship between the target difference, the remaining pure electric cruising range and the thermal management limit power that is pre-calibrated based on the correlation between the target difference, the remaining pure electric cruising range and the thermal management limit power. Specifically, the third mapping relationship is calibrated in a manner including but not limited to: different battery available powers under different remaining pure electric cruising ranges to ensure the thermal management limit power. ≥Battery thermal management requires power, while thermal management limits power As the remaining pure electric range and the available battery power increase, the thermal management effect of the passenger compartment increases smoothly, and there will be no obvious change in the thermal management power of the passenger compartment; in the third mapping relationship, the greater the remaining pure electric range, the greater the thermal management limit power, and the greater the target difference, the greater the thermal management limit power. As an exemplary implementation, the third mapping relationship can be Table 3, where the horizontal axis of Table 3 represents the target difference, that is, , the vertical axis represents the remaining pure electric range , the table lookup value is the thermal management limit power. For example, the third mapping relationship may be as shown in Table 3 below:

[0053] Furthermore, in this embodiment, the thermal management is controlled to limit the power Including battery thermal management power and passenger compartment thermal management power, under different remaining pure electric cruising ranges, the thermal management limit power can be guaranteed to be greater than or equal to the battery thermal management required power. As the remaining pure electric cruising range increases, the thermal management effect of the passenger compartment increases smoothly, and there will be no obvious change in the thermal management power of the passenger compartment.

[0054] Through this embodiment, when the remaining pure electric range is less than 3km, the thermal management requirements can be met first to avoid abnormal battery temperature; when the remaining pure electric range is greater than 3km, the power can be limited based on thermal management control. Grow slowly and release driving power.

[0055] When calculating and determining the vehicle discharge limit power When the priority of each power is comprehensively considered, in this embodiment, the first reserved power The priority is greater than the second reserved power , the second reserved power has priority over thermal management power limit , thermal management limits power has priority over drive power Therefore, the vehicle discharge limit power calculated according to this embodiment is and thermal management to limit power All of them are based on the first reserved power and the second reserved power It is determined on the basis of giving priority to meeting the necessary conditions for vehicle operation and range extender start-up, and then determining the vehicle's driving power based on the battery thermal management requirements, thereby achieving smooth power release while protecting battery health and better releasing the power of the entire vehicle.

[0056] In one embodiment of the present invention, the method further comprises: Get the remaining battery power and average power consumption; The remaining pure electric range is determined based on the remaining battery power and the average power consumption.

[0057] In this embodiment, the remaining pure electric driving range that can be driven based on the current battery remaining power SOE is calculated according to the SOE (State of Energy) and the average power consumption. Among them, SOC (State of Charge) is the ratio of the remaining battery power to the total power. Therefore, the remaining battery power SOE = state of charge SOC * total battery pack power.

[0058] Specifically, the remaining pure electric range can be calculated using Formula 2 : Formula 2: ; in, It is the remaining pure electric driving range; SOE is the remaining battery power, which can be determined by SOE=SOC*total battery power; is the average power consumption.

[0059] The average power consumption of the vehicle can provide a more accurate estimate of the remaining pure electric range, which in turn can be used to more accurately manage energy based on dynamic range and the vehicle's real-time status to protect battery health.

[0060] In one embodiment of the present invention, the method further comprises: Obtain the historical range extender power generation of each cycle, the historical battery actual power of each cycle and the total mileage of the vehicle; The average power consumption is obtained according to the historical range extender generated power, the historical battery actual power and the total mileage of the vehicle.

[0061] In this embodiment, the average power consumption It is calculated by collecting the historical power consumption data and driving distance of the operation cycle through the controller. The historical power consumption data at least includes the historical BMS current obtained from the battery management system and historical BMS voltage and the historical GCU current obtained from the range extender control system and historical GCU voltage .

[0062] Since the required power consumption is different under different temperatures and different car driving habits, the average power consumption obtained by accumulating the historical power consumption data and driving distance of each operating cycle comprehensively considers the user's driving habits and the vehicle usage scenarios of each operating cycle, making the pure electric remaining range calculated by the average power consumption more accurate and more valuable for reference in cold areas, ensuring that the vehicle's discharge limit power and thermal management limit power can meet the vehicle's driving needs and effectively protect the health of the battery.

[0063] In one embodiment of the present invention, the average power consumption is obtained according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle, including: Obtaining a first power consumption according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle; Obtaining a second power consumption according to the mileage range of the total mileage of the vehicle; The average power consumption is determined according to the first power consumption and / or the second power consumption.

[0064] In practical applications, the first power consumption can be calculated by the historical range extender power generation of each cycle, the historical battery actual power of each cycle and the total mileage of the vehicle. ; Then the total mileage of the vehicle is divided into different mileage ranges, and different methods are used to determine the second power consumption in different mileage ranges , and finally based on the total mileage of the vehicle, the first power consumption and / or second power consumption Determine average power consumption .

[0065] Specifically, the first power consumption It can be calculated by formula 3: Formula 3: ; in, is the first power consumption, is the historical BMS current of the i-th operation cycle obtained from the battery management system; is the historical BMS voltage of the i-th operation cycle obtained from the battery management system; is the historical GCU current of the i-th operation cycle obtained from the range extender control system; is the historical GCU voltage of the i-th operation cycle obtained from the range extender control system; since a discrete controller is used, the discrete controller runs and integrates once every 0.01s, so the operation cycle is 0.01s, i is the number of operation cycles of the discrete controller, and i is a positive integer greater than 0; is the total mileage of the vehicle; n is / 100 is rounded down. For example, suppose the total mileage of the current connected vehicle is is 350 km. , round n down to the integer value, and then get n=3.

[0066] In practical applications, the total mileage of the vehicle is Divided into different mileage ranges, the first mileage range is: <100km; the second mileage range is: km; the third mileage range is: >100km, and km.

[0067] Total mileage of vehicle In the first mileage range, the average power consumption : Total mileage of vehicle In the second mileage range, the second power consumption The value is the total mileage of the vehicle arrive km ago Last operation cycle Calculated when The value of this time is the average power consumption For the last run cycle Calculated when The value of: Total mileage of vehicle In the third mileage range, the average power consumption It can be determined by formula 4: Formula 4: ; in, The total mileage of the current vehicle The first power consumption calculated according to Formula 3; The total mileage of the vehicle km hours last operation cycle The second power consumption calculated at ; n is the value rounded down to / 100.

[0068] For example, if the total mileage of the current vehicle is 50km, that is =50km, at this time the total mileage of the vehicle is within the first mileage range, so the average power consumption = ; If the total mileage of the current vehicle is 100km, that is, =100km, the total mileage of the vehicle is within the second mileage range, and the second power consumption The last running cycle before the vehicle's total mileage reaches 100km The first power consumption calculated in km The value of the first power consumption The value is reset to zero, and the average power consumption = ; If the total mileage of the current vehicle is 100km, that is, =100km, the total mileage of the vehicle is within the second mileage range, and the second power consumption The last running cycle before the vehicle's total mileage reaches 100km The first power consumption calculated in km The value of the first power consumption The value is reset to zero, assuming that the vehicle's total mileage reaches 100km in the previous operation cycle and The first power consumption calculated in km The value is 10kW / 100km, and the average power consumption is = =10kW / 100km, and The value of is 0; If the total mileage of the current vehicle is 150km, that is =150km, the total mileage of the vehicle is within the third mileage range. =150km, the first power consumption calculated The value of is 20, and =100km, the second power consumption The value of is 10, so the average power consumption can be calculated according to formula 4 , the first power consumption , Second power consumption and the total mileage of the vehicle Substituting into formula 4, we can get: kW / 100km In this embodiment, the controller periodically calculates the first average power consumption and calculates the second average power consumption in combination with the correspondence between the total mileage of the vehicle and the mileage range. The historical power consumption cumulative value and the current power consumption value can be comprehensively considered when calculating the power consumption to obtain a more accurate average power consumption, and the pure electric remaining cruising range calculated by the average power consumption is determined to be more accurate, thereby making the vehicle discharge limit power and thermal management limit power determined based on the pure electric remaining cruising range more valuable for reference in cold areas, ensuring that the vehicle discharge limit power and thermal management limit power can meet the vehicle driving needs and effectively protect the health of the battery.

[0069] In one embodiment of the present invention, the method further comprises: Determining a power alarm level according to the remaining pure electric range and a preset power level; The vehicle discharge limit power is modified according to the power alarm level.

[0070] After obtaining the remaining pure electric cruising range, you can also set a power alarm level based on the remaining pure electric cruising range. The power alarm levels include at least: level one alarm, level two alarm, and level three alarm.

[0071] In this embodiment, in addition to determining the vehicle discharge limit power based on the remaining pure electric range, the range extender power generation power and the battery available power, or determining the thermal management limit power based on the difference between the vehicle discharge limit power and the reserved power, the remaining pure electric range and the third mapping relationship, the vehicle discharge limit power or the thermal management limit power can also be corrected based on the power alarm level corresponding to the remaining pure electric range.

[0072] Specifically, when the remaining pure electric range When the vehicle is less than 20 km, the battery level 1 alarm will be activated. After the battery level 1 alarm is activated, the remaining pure electric range will be >25km, the battery level 1 alarm will be turned off; When the remaining pure electric range When the remaining range is less than 10km, the battery level will be set to level 2. After the battery level is set to level 2, when the remaining range is 25km or more, the battery level will be set to level 2. >15km, the battery level 2 alarm will be exited and the battery level 1 alarm will be entered; When the remaining pure electric range ≤3km, enter the third level of power alarm; after entering the third level of power alarm, when 15km≥ when the remaining pure electric range When the distance is greater than 5km, the third level alarm of power level will be exited and the second level alarm of power level will be entered.

[0073] In actual applications, when the range extender is in the off state and the vehicle discharge limit power is determined according to the remaining pure electric range, the battery available power and the first mapping relationship, the first mapping relationship will be corrected according to the power alarm level. When the power alarm is at the first level, the vehicle discharge limit power will be limited to avoid the power drop too fast; when the power alarm is at the third level, the vehicle discharge limit power will be strictly limited to avoid over-discharge of the battery pack, and when the power alarm is at the third level and the battery available power is greater than or equal to 5kW, the vehicle discharge limit power is ensured to be greater than or equal to 2kW to ensure that the range extender can be started; the discharge power transition is performed in the second level of the power alarm, so that the vehicle power is released smoothly without obvious power mutation; When the range extender is in the on state and the vehicle discharge limit power is determined based on the remaining pure electric range, the range extender power generation, the battery available power and the second mapping relationship, the second mapping relationship will be corrected according to the power alarm level. When the battery life is below the third-level alarm, more range extender power generation is reserved for rapid battery charging; when the battery life is above the first-level alarm, the range extender power generation is released smoothly to ensure smooth power release without obvious power mutation. When determining the vehicle's discharge limit power and determining the thermal management limit power based on the remaining pure electric range and the third mapping relationship, the third mapping relationship will be corrected according to the battery alarm level. When the battery is at the third-level alarm range, the third mapping relationship will be corrected to give priority to meeting the thermal management needs and avoid abnormal battery temperature. When the third-level alarm range (3km) is above, the thermal management limit power is controlled to increase slowly. On the basis of meeting the vehicle's discharge limit power and thermal management limit power requirements, the driving power is released to ensure smooth power release without obvious power mutation.

[0074] Optionally, while obtaining the vehicle's range extender operating status, battery actual power, battery available power and remaining pure electric range, the vehicle's driving status is also obtained and the duration of the power alarm level is monitored, where the driving status includes at least: the vehicle's current gear status and whether the battery is in a charging state.

[0075] Determine whether the power alarm level and the vehicle status meet the preset conditions. If so, execute the battery protection vehicle discharge limit power determination method to prevent the battery pack from continuing to discharge and causing the battery power to be too low.

[0076] In practical applications, only when both =0, the battery is not charging, the duration of the third-level power alarm is greater than 3 minutes, and the vehicle is currently in P gear. The battery protection vehicle discharge limit power determination method is executed to prompt the user to power off due to low power, and the vehicle is powered off at high voltage to prevent the battery pack from continuing to discharge and causing the battery power to be too low.

[0077] In addition, different prompt effects can be set according to the power alarm level. For example, when the power alarm is at level one, the power box displays yellow; when the power alarm is at level two or level three, the power box displays red.

[0078] Through the embodiments of the present invention, different power alarm levels can be set according to the range of the remaining cruising range, and then energy replenishment reminders can be given according to the power alarm levels, so that the remaining cruising range display is more reasonable.

[0079] In an optional embodiment of the present invention, an alarm level setting and a refueling reminder setting can also be performed for the remaining fuel mileage. When the remaining fuel mileage is ≤50km, the fuel level 1 alarm is entered; after entering the fuel level 1 alarm, when the remaining fuel mileage is >60km, the fuel level 1 alarm is exited; When the remaining fuel mileage is ≤20km, the fuel level alarm will be activated; after the fuel level alarm is activated, when 60km≥the remaining fuel mileage is>30km, the fuel level alarm will be activated, and in the fuel level alarm, the fuel level frame will display yellow; in the fuel level alarm, the fuel level frame will display red.

[0080] In an embodiment of the present invention, the working state of the range extender, the power generation power of the range extender, the available power of the battery and the remaining pure electric cruising range of the vehicle are obtained; if the working state of the range extender is in the off state, the discharge limit power of the whole vehicle is determined according to the remaining pure electric cruising range and the available power of the battery; if the working state of the range extender is in the on state, the discharge limit power of the whole vehicle is determined according to the remaining pure electric cruising range, the power generation power of the range extender and the available power of the battery; the discharge limit power of the whole vehicle under different working states of the range extender is determined by the remaining cruising range of the vehicle, the power generation power of the range extender and the available power of the battery, and energy management can be performed based on dynamic cruising range and the real-time state of the vehicle, which is beneficial to protecting the health of the battery and ensuring that the vehicle's power and comfort are not affected during the energy management process.

[0081] Reference Figure 2 , shows a structural block diagram of an embodiment of a vehicle discharge limit power determination device of the present application, which may specifically include the following modules: The data acquisition module 201 is used to obtain the working status of the range extender, the power generated by the range extender, the available power of the battery and the remaining pure electric range of the vehicle; The range extender is turned off and the vehicle discharge limit power determination module 202 is used to determine the vehicle discharge limit power according to the remaining pure electric cruising range and the battery available power if the range extender is in the off state; The range extender-on vehicle discharge limit power determination module 203 is used to determine the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power if the range extender is in the on state.

[0082] In an embodiment of the present application, a device for determining a vehicle discharge limit power provided in an embodiment of the present application obtains the working state of the vehicle's range extender, the power generation power of the range extender, the available power of the battery, and the remaining pure electric range; if the working state of the range extender is in an off state, the discharge limit power of the vehicle is determined according to the remaining pure electric range and the available power of the battery; if the working state of the range extender is in an on state, the discharge limit power of the vehicle is determined according to the remaining pure electric range, the power generation power of the range extender, and the available power of the battery; the discharge limit power of the vehicle under different working states of the range extender is determined by the remaining range of the vehicle, the power generation power of the range extender, and the available power of the battery, and energy management can be performed based on dynamic range and the real-time state of the vehicle, which is beneficial to protecting the health of the battery, and ensuring that the vehicle's power and comfort are not affected during the energy management process.

[0083] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0084] An embodiment of the present application also provides a vehicle-mounted terminal, including: a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory, and when the computer program is executed by the processor, the various processes of the above-mentioned vehicle discharge limit power determination method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0085] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0086] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the present application may be provided in the form of a complete hardware embodiment, a complete software embodiment, or a combination of software and hardware embodiments. Moreover, the present application may be provided in the form of a computer program product implemented 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.

[0087] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable terminal device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0090] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0091] Finally, it should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0092] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0093] A method for determining the discharge limit power of a whole vehicle and a device for determining the discharge limit power of a whole vehicle provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for determining the discharge limit power of a vehicle, characterized in that: The method comprises: Obtain the vehicle's range extender operating status, range extender power generation, battery available power, and remaining pure electric range; If the range extender is in the off state, the vehicle discharge limit power is determined according to the remaining pure electric range and the available power of the battery; If the range extender is in the on state, the vehicle discharge limit power is determined according to the remaining pure electric range, the power generation power of the range extender and the available power of the battery.

2. The method according to claim 1, characterized in that Determining the vehicle discharge limit power according to the remaining pure electric cruising range and the available power of the battery includes: determining a first target parameter according to the remaining pure electric cruising range, the battery available power, and a first mapping relationship, wherein the first mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the battery available power, and the first target parameter; The vehicle discharge limit power is determined according to the first target parameter.

3. The method according to claim 2, characterized in that Determining the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power includes: Determining a second target parameter according to the remaining pure electric cruising range, the power generation power of the range extender, and a second mapping relationship, wherein the second mapping relationship is used to indicate a relationship between the remaining pure electric cruising range, the power generation power of the range extender, and the second target parameter; The vehicle discharge limit power is determined according to the first target parameter, the second target parameter and the range extender power generation power.

4. The method according to claim 1, characterized in that: The method further comprises: Obtaining a difference between the vehicle discharge limit power and the reserved power to obtain a target difference, wherein the reserved power is determined according to the working state of the range extender; The thermal management limit power is determined according to the target difference, the remaining pure electric cruising range and a third mapping relationship, wherein the third mapping relationship is used to indicate the relationship between the remaining pure electric cruising range, the target difference and the thermal management limit power.

5. The method according to claim 1, characterized in that The method further comprises: Get the remaining battery power and average power consumption; The remaining pure electric range is determined based on the remaining battery power and the average power consumption.

6. The method according to claim 5, characterized in that The method further comprises: Obtain the historical range extender power generation of each cycle, the historical battery actual power of each cycle and the total mileage of the vehicle; The average power consumption is obtained according to the historical range extender generated power, the historical battery actual power and the total mileage of the vehicle.

7. The method according to claim 6, characterized in that The average power consumption is obtained according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle, including: Obtaining a first power consumption according to the historical range extender power generation, the historical battery actual power and the total mileage of the vehicle; Obtaining a second power consumption according to the mileage range of the total mileage of the vehicle; The average power consumption is determined according to the first power consumption and / or the second power consumption.

8. The method according to claim 1, characterized in that The method further comprises: Determining a power alarm level according to the remaining pure electric range and a preset power level; The vehicle discharge limit power is modified according to the power alarm level.

9. A device for determining the discharge limit power of a vehicle, characterized in that: The device comprises: A data acquisition module is used to obtain the vehicle's range extender operating status, range extender power generation, battery available power, and pure electric remaining range; A module for determining the discharge limit power of the whole vehicle when the range extender is turned off, for determining the discharge limit power of the whole vehicle according to the remaining pure electric cruising range and the available power of the battery if the working state of the range extender is turned off; The range extender is turned on and the vehicle discharge limit power determination module is used to determine the vehicle discharge limit power according to the remaining pure electric range, the range extender power generation power and the battery available power if the range extender is in the turned on state.

10. A vehicle-mounted terminal, characterized in that: It comprises a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the method for determining the vehicle discharge limit power as described in any one of claims 1 to 8.

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