Method, device and equipment for controlling state of charge of vehicle battery

Abstract

The invention provides a control method, device and equipment for the state of charge of a vehicle battery, and the method comprises the steps: obtaining the current state of charge of a power battery system of a vehicle under the condition that the vehicle is started; judging whether the current state of charge is greater than a preset state of charge determined according to the battery temperature in the power battery system, and obtaining a first judgment result; controlling the power state of the vehicle according to the first judgment result; wherein the power state is a power matching state of a range extender and a power battery system of the vehicle. According to the embodiment of the invention, the power matching state of the range extender and the power battery system is controlled according to the magnitude relationship between the current state of charge of the power battery system of the vehicle and the preset state of charge determined according to the battery temperature in the power battery system, so that the two kinds of power energy of the extended-range electric vehicle are reasonably matched for use; the energy consumption can be saved, the vehicle using cost is reduced, the battery can be used more safely and reasonably, the battery safety is improved, and the battery service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method, device and equipment for controlling the state of charge of a vehicle battery. Background Art

[0002] The extended-range electric vehicle is one of the products with the most promising industrialization prospects. Compared with other hybrid vehicles, the extended-range electric vehicle has a simple configuration system, more reliable performance and less cost; compared with pure electric vehicles, the extended-range electric vehicle has a longer driving range and lower cost. However, since the extended-range vehicle has two power sources, the power battery can provide power energy alone or be matched with the range extender to provide energy for the whole vehicle. How to match the two power sources to bring customers a comfortable driving experience, save energy, reduce vehicle costs, and use batteries more safely and reasonably, and improve battery safety and battery life, is a problem that needs to be solved at present. Summary of the invention

[0003] The purpose of the present invention is to provide a method, device and equipment for controlling the state of charge of a vehicle battery, which is used to solve the problem in the prior art of how to match the two power energy sources of an extended-range electric vehicle, thereby saving energy consumption and reducing vehicle use costs, while also being able to use the battery more safely and reasonably, and improving battery safety and battery life.

[0004] To achieve the above object, an embodiment of the present invention provides a method for controlling the state of charge of a vehicle battery, which includes:

[0005] When the vehicle is started, obtaining a current state of charge of a power battery system of the vehicle;

[0006] Determine whether the current state of charge is greater than a preset state of charge, and obtain a first determination result; wherein the preset state of charge is determined according to a battery temperature in the power battery system;

[0007] According to the first judgment result, the power state of the vehicle is controlled; wherein the power state is a power matching state between the range extender of the vehicle and the power battery system.

[0008] Optionally, the method further comprises:

[0009] When the vehicle is parked and charged, obtaining the minimum stable power of the range extender and the minimum required power of the power battery system;

[0010] Determine whether the minimum stable power is greater than the minimum required power, and obtain a second determination result;

[0011] According to the second judgment result, the first output power of the range extender to the power battery system is adjusted.

[0012] Optionally, the method, wherein adjusting the first output power of the range extender to the power battery system according to the second judgment result, includes:

[0013] When the minimum stable power is less than or equal to the minimum required power, increasing the first output power; and

[0014] When the lowest stable power is greater than the minimum required power, the first output power is reduced.

[0015] Optionally, the method further comprises:

[0016] Acquiring the power mode of the vehicle and the battery temperature; wherein the power mode is a preset power matching state of the range extender and the power battery system;

[0017] Determine a first calculation formula for the preset state of charge according to the power mode;

[0018] The preset state of charge is determined according to the first estimation formula and the battery temperature.

[0019] Optionally, in the method, the power mode includes one or more of the following:

[0020] Priority power mode;

[0021] Hybrid mode;

[0022] Prioritize oil usage mode.

[0023] Optionally, in the method, controlling the power state of the vehicle according to the first judgment result includes:

[0024] When the current state of charge is greater than the preset state of charge, controlling the power state to make the power battery system be in a discharging state; and

[0025] When the current state of charge is less than the preset state of charge, the power state is controlled to be a state in which the range extender charges the power battery system.

[0026] Optionally, the method further comprises:

[0027] Obtaining the vehicle weight, the rated capacity of the power battery system and the battery temperature of the vehicle;

[0028] Determine a second calculation formula for the preset state of charge according to the battery temperature;

[0029] The preset state of charge is determined according to the vehicle weight, the rated power and the second calculation formula.

[0030] Optionally, in the method, controlling the power state of the vehicle according to the first judgment result includes:

[0031] When the current state of charge is greater than the preset state of charge, the power state is controlled so that the discharge power of the power battery system is greater than the second output power of the range extender; the second output power is the output power of the range extender for the power system of the vehicle; and

[0032] When the current state of charge is less than the preset state of charge, the power state is controlled according to a third judgment result; wherein the third judgment result is a result of judging whether the power demand of the vehicle is greater than the discharge power.

[0033] Optionally, in the method, the controlling the power state according to the third judgment result comprises:

[0034] When the power demand is greater than the discharge power, controlling the power state so that the discharge power is less than the second output power;

[0035] When the power demand is less than or equal to the discharge power, the power state is controlled so that the discharge power is greater than the second output power.

[0036] In order to achieve the above object, an embodiment of the present invention further provides a vehicle battery charge state control device, which includes:

[0037] A first acquisition module, used for acquiring a current state of charge of a power battery system of the vehicle when the vehicle is started;

[0038] A second acquisition module, used to determine whether the current state of charge is greater than a preset state of charge, and obtain a first judgment result; wherein the preset state of charge is determined according to a battery temperature in the power battery system;

[0039] The first processing module is used to control the power state of the vehicle according to the first judgment result; wherein the power state is the power matching state of the range extender of the vehicle and the power battery system.

[0040] In order to achieve the above-mentioned purpose, an embodiment of the present invention also provides an electronic device, including: a processor, a memory, and a program or instruction stored in the memory and executable on the processor; wherein, when the processor executes the program or instruction, the vehicle battery charge state control method as described above is implemented.

[0041] In order to achieve the above-mentioned purpose, an embodiment of the present invention further provides a readable storage medium having a program or instruction stored thereon, wherein the program or instruction, when executed by a processor, implements the steps in the vehicle battery state of charge control method as described above.

[0042] In order to achieve the above-mentioned object, an embodiment of the present invention further provides a computer program product, which includes computer instructions, and when the computer instructions are executed by a processor, the steps of the vehicle battery state of charge control method as described above are implemented.

[0043] The beneficial effects of the above technical solution of the present invention are as follows:

[0044] In the embodiment of the present invention, when the vehicle is started, the power matching state of the range extender and the power battery system is controlled according to the relationship between the current state of charge of the vehicle's power battery system and the preset state of charge determined according to the battery temperature in the power battery system, so as to reasonably match and use the two power energy sources of the range-extended electric vehicle, which can save energy consumption, reduce vehicle use costs, and at the same time use batteries more safely and reasonably, thereby improving battery safety and battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a method for controlling a vehicle battery state of charge according to an embodiment of the present invention;

[0046] Figure 2 One of the flow charts of the method for controlling the state of charge of a vehicle battery according to an embodiment of the present invention;

[0047] Figure 3 This is a second flowchart of the method for controlling the state of charge of a vehicle battery according to an embodiment of the present invention;

[0048] Figure 4 This is a flowchart of the method for controlling the state of charge of a vehicle battery according to an embodiment of the present invention;

[0049] Figure 5 Schematic diagram of a vehicle battery state of charge control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0051] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0052] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0053] Additionally, the terms "system" and "network" are often used interchangeably herein.

[0054] In the embodiments provided in the present application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0055] For ease of understanding, some contents involved in the embodiments of the present invention are described below:

[0056] like Figure 1 As shown, a method for controlling the state of charge of a vehicle battery according to an embodiment of the present invention includes:

[0057] S10, when the vehicle is started, obtaining a current state of charge of a power battery system of the vehicle;

[0058] It should be noted that when the vehicle is started, the current state of charge SOC is obtained.

[0059] S20, determining whether the current state of charge is greater than a preset state of charge, and obtaining a first determination result; wherein the preset state of charge is determined according to a battery temperature in the power battery system;

[0060] It should be noted that the first judgment result is obtained by comparing the current state of charge with the preset state of charge determined according to the battery temperature in the power battery system, wherein the preset state of charge is the SOC value of the equilibrium state.

[0061] S30, controlling the power state of the vehicle according to the first judgment result; wherein the power state is a power matching state between the range extender of the vehicle and the power battery system;

[0062] It should be noted that when the current state of charge is not equal to the preset state of charge, that is, the SOC value of the equilibrium state, the power state of the vehicle is controlled.

[0063] In this embodiment, when the vehicle is started, the power matching state of the range extender and the power battery system is controlled according to the relationship between the current state of charge of the power battery system of the vehicle and the preset state of charge determined according to the battery temperature in the power battery system, so as to reasonably match and use the two power energy sources of the range-extended electric vehicle, which can save energy consumption, reduce vehicle use costs, and at the same time use batteries more safely and reasonably, thereby improving battery safety and battery life.

[0064] Optionally, the method further comprises:

[0065] When the vehicle is parked and charged, obtaining the minimum stable power of the range extender and the minimum required power of the power battery system;

[0066] Determine whether the minimum stable power is greater than the minimum required power, and obtain a second determination result;

[0067] According to the second judgment result, the first output power of the range extender to the power battery system is adjusted.

[0068] It should be noted that the embodiment of the present invention provides a Figure 4 In the example shown, when the vehicle starts the parking charging mode, it is determined that P min增 With P min充 The size of P min增 is the minimum stable power of the range extender, P min充 is the minimum required power of the power battery system, and determines P min增 With P min充 According to the second judgment result, the first output power of the range extender to the power battery system is adjusted, and the vehicle controller controls the range extender to generate electricity in combination with the battery charging power requirement and the vehicle high-voltage load power requirement, and within the battery safety boundary (charging power is not greater than P min充 ) to charge the power battery system.

[0069] Optionally, the method, wherein adjusting the first output power of the range extender to the power battery system according to the second judgment result, includes:

[0070] When the minimum stable power is less than or equal to the minimum required power, increasing the first output power; and

[0071] When the lowest stable power is greater than the minimum required power, the first output power is reduced.

[0072] In this embodiment, the second judgment result includes two modes. In the first mode, P min增 ≤P min充 , that is, when the minimum stable power is less than or equal to the minimum required power, the first output power is increased. During the full charging of the power battery system, the BMS (battery management system) reads the current state of charge and the battery temperature of the power battery system and reports them to the vehicle controller. The vehicle controller feeds back the power demand to the range extender, and the range extender outputs power with reference to the charging demand of the power battery system until the battery is fully charged. During the battery charging process, if the liquid cooling needs to be started due to the high battery temperature, or the air conditioning needs to be turned on in the cockpit, or for other reasons, a high-voltage load is started, the vehicle controller combines the power battery charging demand and other high-voltage load demands, and therefore needs to increase the first output power of the range extender until the battery in the power battery system is fully charged. In the second mode, P min增 >P min充 , that is, when the minimum stable power is greater than the minimum required power, the first output power is lowered. During the full charging of the power battery, although P min增 >P min充 The charging capacity of the power battery system is related to the current state of charge and the battery temperature. When the SOC is low, the controllable stable power of the range extender meets the charging power of the power battery, and the high-voltage load is not involved in the work, the vehicle controller feeds back the power demand reported by the BMS to the range extender, and the range extender can output power according to the required power to charge the power battery system. During the charging process, P min增 >P min充 The vehicle controller controls the start-up of certain high-voltage loads of the vehicle to share part of the power generated by the range extender, thereby reducing the first output power until the power battery is fully charged. Among them, the high-voltage load can be an air-conditioning compressor, a heating system, etc.

[0073] It should be noted that, for extended-range hybrid vehicles, when the range extender is charging the power battery, the main reason for limiting the charging online is that at high SOC, the charging capacity of the power battery system is weakened, and high current charging is easy to cause battery damage, reduce battery life, and seriously cause safety problems. When the range extender is charging the power battery system, the battery management system first obtains the current SOC state and current temperature state of the power battery system, and determines the current maximum charging capacity of the power battery system, including peak charging power capacity and continuous charging power capacity; and the battery management system reports the current charging capacity of the power battery system to the vehicle controller. The vehicle controller combines the current charging power demand of the power battery system, the power demand of other high-voltage loads of the vehicle, the accuracy error of the current temperature state of the range extender, and the power rise rate and fall rate of the range extender to determine the power generation power of the range extender and charge the power battery system. At the same time, the battery management system reads the voltage, current, temperature and other information of the power battery system in real time to determine whether the power battery system is charged beyond the boundary. If it exceeds the charging capacity of the power battery system, it is reported and processed in combination with the current size and fault handling plan.

[0074] The method for controlling the state of charge of the vehicle battery described in the embodiment of the present invention can ensure that the charging process of the whole vehicle is within the safety boundary of the power battery. Based on this method, the range extender can fully charge the power battery, so the whole vehicle can consider canceling the external charging function and charging-related components, such as fast charging relays, high-voltage wiring harnesses, and charging ports, thereby reducing the cost of the whole vehicle. Similarly, the power battery of this method can be a ternary battery or a lithium iron phosphate battery, thereby reducing the cost of the power battery system.

[0075] Optionally, the method further comprises:

[0076] Acquiring the power mode of the vehicle and the battery temperature; wherein the power mode is a preset power matching state of the range extender and the power battery system;

[0077] Determine a first calculation formula for the preset state of charge according to the power mode;

[0078] The preset state of charge is determined according to the first estimation formula and the battery temperature.

[0079] It should be noted that the embodiment of the present invention now provides a Figure 2 The example of determining the state of charge of the vehicle battery according to the power mode shown in the figure determines the vehicle mode (i.e., the power mode) after the vehicle is started, and determines the target SOC (i.e., the preset state of charge). The first calculation formula is P 放电 (X% t SOC)=P 放电 (M% 25℃ SOC), where P放电 (M% 25℃ SOC) is the discharge power of the power battery system corresponding to the M% SOC state of the power battery system when the battery temperature is 25°C, and M sets different recommended values ​​according to different power modes. The current battery temperature is input according to the first calculation formula to calculate the SOC balance value (i.e. the preset state of charge).

[0080] Optionally, in the method, the power mode includes one or more of the following:

[0081] Priority power mode;

[0082] Hybrid mode;

[0083] Prioritize oil usage mode.

[0084] In this embodiment, when the power battery system is used in combination with the vehicle range extender, it is generally divided into three modes. The SOC state of the power battery system is in a high SOC state (recommended: 70% to 80%), a medium SOC state (recommended: 40% to 50%), and a low SOC state (recommended: 15% to 30%). According to these three modes, the power mode is divided into an oil priority mode (recommended: 70% to 80%), a hybrid power mode (recommended: 40% to 50%), and an electricity priority mode (recommended: 15% to 30%). The preset state of charge corresponding to the three power modes is obtained as follows:

[0085] Priority power mode, P 放电 (X% t SOC)=P 放电 (20% 25℃ SOC) to estimate the SOC equilibrium value at different power battery temperatures. 放电 (20% 25℃ SOC) that is, when the lowest temperature of the single cells in the power battery system (that is, the battery temperature) is 25° C., the discharge power corresponding to the 20% SOC state of the power battery system; P 放电 (X% t SOC) means the discharge power corresponding to the X% SOC state of the power battery system when the lowest temperature of the single cell in the power battery system is t℃. Wherein t is the lowest temperature of the single cell in the power battery system (i.e. the battery temperature) in the current state after the vehicle is started. t is updated in real time as the vehicle runs. When t≥25℃, the SOC value of the vehicle in equilibrium state (i.e. the preset state of charge) is recommended to be 20%.

[0086] Priority oil mode, X% t SOC is determined by: 放电 (X% t SOC)=P放电 (80% 25℃ SOC), when t≥25°C, the SOC value of the vehicle in equilibrium state (ie, the preset state of charge) is recommended to be 80%.

[0087] Hybrid mode, X% t SOC is determined by: 放电 (X% t SOC)=P 放电 (50% 25℃ When t≥25°C, the SOC value of the vehicle in equilibrium state (ie, the preset state of charge) is recommended to be 50%.

[0088] Optionally, in the method, step S30 includes:

[0089] When the current state of charge is greater than the preset state of charge, controlling the power state to make the power battery system be in a discharging state; and

[0090] When the current state of charge is less than the preset state of charge, the power state is controlled to be a state in which the range extender charges the power battery system.

[0091] In this embodiment, after the vehicle is started, the power mode is first determined, the target SOC value (i.e., the preset state of charge) is determined, and the real SOC state of the power battery system (the current state of charge) is read. If the real SOC value is higher than the target SOC value, during the driving process of the vehicle, the vehicle controller adjusts the power matching between the range extender and the power battery in combination with the actual power demand of the vehicle, so that the power battery system is in a discharging state, and the real SOC state is reduced until the real SOC is consistent with the target SOC. If the real SOC is lower than the target SOC after the vehicle is started, the vehicle controller combines the actual power demand of the vehicle and the power generation capacity of the range extender to put the power battery system in a charging state, and improve the real SOC state until the real SOC is consistent with the target SOC.

[0092] Optionally, the method further comprises:

[0093] Obtaining the vehicle weight, the rated capacity of the power battery system and the battery temperature of the vehicle;

[0094] Determine a second calculation formula for the preset state of charge according to the battery temperature;

[0095] The preset state of charge is determined according to the vehicle weight, the rated power and the second calculation formula.

[0096] It should be noted that the embodiment of the present invention now provides a Figure 3As shown, to ensure the power of the whole vehicle and dynamically update the state of charge of the vehicle battery, after the whole vehicle is started, the battery management system obtains the current SOC state of the power battery system (i.e., the current state of charge), the current temperature state, determines the current discharge power capability of the power battery system (including peak power and continuous power), and reports it to the whole vehicle control system. The whole vehicle controller determines the power output source (i.e., the power state) in combination with the motor power demand of the whole vehicle working condition, the SOC state of the power battery system, and the battery discharge capacity. If the SOC state of the power battery system (i.e., the current state of charge) is greater than A%, and the output power capability of the power battery system can meet the power demand of the whole vehicle, the power battery system provides power to meet the power demand of the whole vehicle. If the SOC state of the power battery system is ≤A% (i.e., the preset state of charge), and the output power capability of the power battery system cannot meet the demand of the whole vehicle, the power source of the whole vehicle is changed from the power battery system to the power battery system and the range extender, and the two energy systems jointly meet the power demand of the whole vehicle. The second extrapolation formula is P 回馈 (A% t SOC)=P 回馈 (A% 25℃ SOC), P 回馈 (A% 25℃ SOC) that is, when the lowest temperature of the single cell in the power battery system (i.e., the battery temperature) is 25°C, the SOC state of the power battery system is A% corresponding to the feedback power of the power battery system. 回馈 (A% t SOC) means that when the lowest temperature of the single cell in the power battery system (i.e. the battery temperature) is t℃, the SOC state of the power battery system is A% of the corresponding feedback power of the power battery system. Wherein t is the lowest temperature of the single cell in the power battery system (i.e. the battery temperature) in the current state after the vehicle is started. t is updated in real time as the vehicle runs. When t=25℃, the SOC value of the vehicle in equilibrium state (i.e. the preset state of charge) is recommended to be executed according to Table 1.

[0097] Table 1

[0098]

[0099] The size of the SOC state A value (i.e., the preset state of charge) needs to be determined in combination with the rated power and the vehicle weight. The lower the rated power, the higher the vehicle weight, and the smaller the A value; conversely, the higher the rated power, the lower the vehicle weight, and the larger the A value. The A value is also related to the battery temperature. The higher the battery temperature, the larger the A value, and the lower the battery temperature, the smaller the A value.

[0100] For example: when the power battery system is 40kWh, the vehicle weight is 3300kg, and the lowest single cell temperature of the power battery system is 25°C, the recommended A value is 75%. After the vehicle is started, when the power battery system SOC is greater than 75%, the vehicle controller will give priority to controlling the power battery system to release electrical energy to provide power for the vehicle.

[0101] The second calculation formula uses feedback power to determine the SOC value at other temperatures because this example needs to ensure the power of the whole vehicle, and the A value (i.e., the preset state of charge) is relatively higher. When the whole vehicle is driving, the range extender is in a high-power state and the whole vehicle suddenly decelerates. The kinetic energy of the whole vehicle needs to be fed back to the power battery system. The power battery system needs to have the ability to accept feedback power, so the A value at other temperatures is calculated according to the feedback power.

[0102] Optionally, in the method, step S30 includes:

[0103] When the current state of charge is greater than the preset state of charge, the power state is controlled so that the discharge power of the power battery system is greater than the second output power of the range extender; the second output power is the output power of the range extender for the power system of the vehicle; and

[0104] When the current state of charge is less than the preset state of charge, the power state is controlled according to a third judgment result; wherein the third judgment result is a result of judging whether the power demand of the vehicle is greater than the discharge power.

[0105] In this embodiment, if Figure 3 As shown, when SOC>A% (i.e., the current state of charge is greater than the preset state of charge), the power battery system mainly provides power for the entire vehicle, that is, the power state is controlled so that the discharge power of the power battery system is greater than the second output power. When SOC≤A% (i.e., the current state of charge is less than the preset state of charge), it is necessary to determine again whether the power demand of the vehicle is greater than the discharge power, so as to determine the power state.

[0106] Optionally, in the method, the controlling the power state according to the third judgment result comprises:

[0107] When the power demand is greater than the discharge power, controlling the power state so that the discharge power is less than the second output power;

[0108] When the power demand is less than or equal to the discharge power, the power state is controlled so that the discharge power is greater than the second output power.

[0109] In this embodiment, if Figure 3 As shown, when SOC≤A% (i.e., the current state of charge is less than the preset state of charge), there are two modes: Mode 1: the range extender is the main one and the power battery system is the auxiliary one to provide power for the whole vehicle, i.e., the discharge power is less than the second output power; Mode 2: the power battery system is the main one and the range extender is the auxiliary one to provide power for the whole vehicle, i.e., the discharge power is greater than the second output power. At normal temperature (25°C), it is recommended to use an SOC equilibrium state of 20% to determine which of the two modes to use. When the current state of charge is less than the preset state of charge and less than the SOC equilibrium state (20%), mode 1 is used to control the power state so that the discharge power is less than the second output power; when the current state of charge is less than the preset state of charge and greater than the SOC equilibrium state (20%), mode 2 is used to control the power state so that the discharge power is greater than the second output power. At other temperatures, the SOC equilibrium state is adjusted according to P 放电 (X% t SOC)=P 放电 (20% 25℃ SOC) is estimated, where P 放电 (20% 25℃ SOC) means the power battery system discharge power corresponding to the power battery system SOC state of 20% when the lowest temperature of the single cell in the power battery system (i.e. the battery temperature) is 25°C; P 放电 (X% t SOC) means the discharge power of the power battery system corresponding to the SOC state of X% when the lowest temperature of the single cells in the power battery system (ie the battery temperature) is t°C.

[0110] like Figure 5 As shown, in order to achieve the above-mentioned purpose, an embodiment of the present invention further provides a vehicle battery charge state control device, which includes:

[0111] A first acquisition module 501 is used to acquire the current state of charge of the power battery system of the vehicle when the vehicle is started;

[0112] A second acquisition module 502 is used to determine whether the current state of charge is greater than a preset state of charge, and obtain a first determination result; wherein the preset state of charge is determined according to the battery temperature in the power battery system;

[0113] The first processing module 503 is used to control the power state of the vehicle according to the first judgment result; wherein the power state is the power matching state of the range extender of the vehicle and the power battery system.

[0114] Optionally, the device further comprises:

[0115] A third acquisition module is used to obtain the minimum stable power of the range extender and the minimum required power of the power battery system when the vehicle is parked and charged;

[0116] A fourth acquisition module, used to determine whether the minimum stable power is greater than the minimum required power, and obtain a second determination result;

[0117] The second processing module is used to adjust the first output power of the range extender to the power battery system according to the second judgment result.

[0118] Optionally, in the device, the second processing module comprises:

[0119] A first processing unit is configured to increase the first output power when the minimum stable power is less than or equal to the minimum required power; and

[0120] The second processing unit is configured to reduce the first output power when the minimum stable power is greater than the minimum required power.

[0121] Optionally, the device further comprises:

[0122] a fifth acquisition module, configured to acquire a power mode of the vehicle and a battery temperature; wherein the power mode is a preset power matching state of the range extender and the power battery system;

[0123] A first determination module, configured to determine a first calculation formula for the preset state of charge according to the power mode;

[0124] The second determination module is used to determine the preset state of charge according to the first calculation formula and the battery temperature.

[0125] Optionally, in the device, the power mode includes one or more of the following:

[0126] Priority power mode;

[0127] Hybrid mode;

[0128] Prioritize oil usage mode.

[0129] Optionally, in the device, the first processing module 503 includes:

[0130] A third processing unit is used for controlling the power state to make the power battery system be in a discharging state when the current state of charge is greater than the preset state of charge; and

[0131] The fourth processing unit is used to control the power state to be a state in which the range extender charges the power battery system when the current state of charge is less than the preset state of charge.

[0132] Optionally, the device further comprises:

[0133] a sixth acquisition module, configured to acquire the vehicle weight, the rated capacity of the power battery system, and the battery temperature;

[0134] A third determination module, configured to determine a second calculation formula for the preset state of charge according to the battery temperature;

[0135] The fourth determination module is used to determine the preset state of charge according to the vehicle weight, the rated power and the second calculation formula.

[0136] Optionally, in the device, the first processing module 503 includes:

[0137] a fifth processing unit, configured to control the power state to be such that the discharge power of the power battery system is greater than the second output power of the range extender when the current state of charge is greater than the preset state of charge; the second output power is the output power of the range extender for the power system of the vehicle; and

[0138] The sixth processing unit is used to control the power state according to a third judgment result when the current state of charge is less than the preset state of charge; wherein the third judgment result is a result of judging whether the power demand of the vehicle is greater than the discharge power.

[0139] Optionally, in the device, the sixth processing unit includes:

[0140] A first processing component, configured to control the power state so that the discharge power is less than the second output power when the power demand is greater than the discharge power;

[0141] The second processing component is used to control the power state so that the discharge power is greater than the second output power when the power demand is less than or equal to the discharge power.

[0142] It should be noted here that the above-mentioned device provided in the embodiment of the present invention can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0143] To achieve the above-mentioned purpose, an embodiment of the present invention provides an electronic device, comprising: a processor, a memory, and a program or instruction stored in the memory and executable on the processor; wherein, when the processor executes the program or instruction, the vehicle battery charge state control method as described above is implemented.

[0144] To achieve the above objectives, an embodiment of the present invention provides a readable storage medium having a program or instruction stored thereon, wherein the program or instruction, when executed by a processor, implements the steps in the vehicle battery state of charge control method as described above.

[0145] It should be further explained that the terminals described in this specification include but are not limited to smart phones, tablet computers, etc., and many of the functional components described are called modules in order to more particularly emphasize the independence of their implementation methods.

[0146] In the embodiment of the present invention, module can be implemented with software so that it can be executed by various types of processors. For example, an executable code module of an identification can include one or more physical or logical blocks of computer instructions, for example, it can be constructed as an object, process or function. Nevertheless, the executable code of the identified module does not need to be physically located together, but can include different instructions stored in different positions, and when these instructions are logically combined together, it constitutes a module and realizes the specified purpose of the module.

[0147] In fact, executable code module can be a single instruction or many instructions, and can even be distributed on a plurality of different code segments, distributed among different programs, and distributed across a plurality of memory devices. Similarly, operating data can be identified in the module, and can be implemented and organized in the data structure of any appropriate type according to any appropriate form. The operating data can be collected as a single data set, or can be distributed in different locations (including on different storage devices), and can only be present on a system or network as an electronic signal at least in part.

[0148] When a module can be implemented by software, considering the level of existing hardware technology, a person skilled in the art can build a corresponding hardware circuit to implement the corresponding function of the module that can be implemented by software without considering the cost. The hardware circuit includes a conventional very large scale integration (VLSI) circuit or gate array and existing semiconductors such as logic chips, transistors, or other discrete components. The module can also be implemented by a programmable hardware device, such as a field programmable gate array, a programmable array logic, a programmable logic device, etc.

[0149] To achieve the above objective, an embodiment of the present invention provides a computer program product, which includes computer instructions, and when the computer instructions are executed by a processor, the steps of the vehicle battery state of charge control method as described above are implemented.

[0150] The above exemplary embodiments are described with reference to the accompanying drawings, and many different forms and embodiments are feasible without departing from the spirit and teachings of the present invention. Therefore, the present invention should not be constructed as a limitation of the exemplary embodiments proposed herein. More specifically, these exemplary embodiments are provided so that the present invention will be perfect and complete, and the scope of the present invention will be conveyed to those who are familiar with the technology. In these figures, the component sizes and relative sizes may be exaggerated for clarity. The terms used here are only based on the purpose of describing specific exemplary embodiments and are not intended to be limiting. As used herein, unless the text clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to include these multiple forms. It will be further understood that the terms "including" and / or "comprising" when used in this specification indicate the presence of the features, integers, steps, operations, components and / or components, but do not exclude the presence or increase of one or more other features, integers, steps, operations, components, components and / or their groups. Unless otherwise indicated, when stated, a range of values ​​includes the upper and lower limits of that range and any subranges therebetween.

[0151] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling the state of charge of a vehicle battery, characterized in that: include: When the vehicle is started, obtaining a current state of charge of a power battery system of the vehicle; Determine whether the current state of charge is greater than a preset state of charge, and obtain a first determination result; wherein the preset state of charge is determined according to a battery temperature in the power battery system; According to the first judgment result, the power state of the vehicle is controlled; wherein the power state is a power matching state between the range extender of the vehicle and the power battery system.

2. The method according to claim 1, characterized in that The method further comprises: When the vehicle is parked and charged, obtaining the minimum stable power of the range extender and the minimum required power of the power battery system; Determine whether the minimum stable power is greater than the minimum required power, and obtain a second determination result; According to the second judgment result, the first output power of the range extender to the power battery system is adjusted.

3. The method according to claim 2, characterized in that The adjusting the first output power of the range extender to the power battery system according to the second judgment result includes: When the minimum stable power is less than or equal to the minimum required power, increasing the first output power; and When the lowest stable power is greater than the minimum required power, the first output power is reduced.

4. The method according to claim 1, characterized in that The method further comprises: Acquiring the power mode of the vehicle and the battery temperature; wherein the power mode is a preset power matching state of the range extender and the power battery system; Determine a first calculation formula for the preset state of charge according to the power mode; The preset state of charge is determined according to the first estimation formula and the battery temperature.

5. The method according to claim 4, characterized in that The power mode includes one or more of the following: Priority power mode; Hybrid mode; Prioritize oil usage mode.

6. The method according to claim 4, characterized in that The controlling the power state of the vehicle according to the first judgment result includes: When the current state of charge is greater than the preset state of charge, controlling the power state to make the power battery system be in a discharging state; and When the current state of charge is less than the preset state of charge, the power state is controlled to be a state in which the range extender charges the power battery system.

7. The method according to claim 1, characterized in that The method further comprises: Obtaining the vehicle weight, the rated capacity of the power battery system and the battery temperature of the vehicle; Determine a second calculation formula for the preset state of charge according to the battery temperature; The preset state of charge is determined according to the vehicle weight, the rated power and the second calculation formula.

8. The method according to claim 7, characterized in that The controlling the power state of the vehicle according to the first judgment result includes: When the current state of charge is greater than the preset state of charge, the power state is controlled so that the discharge power of the power battery system is greater than the second output power of the range extender; the second output power is the output power of the range extender for the power system of the vehicle; and When the current state of charge is less than the preset state of charge, the power state is controlled according to a third judgment result; wherein the third judgment result is a result of judging whether the power demand of the vehicle is greater than the discharge power.

9. The method according to claim 8, characterized in that The controlling the power state according to the third judgment result includes: When the power demand is greater than the discharge power, controlling the power state so that the discharge power is less than the second output power; When the power demand is less than or equal to the discharge power, the power state is controlled so that the discharge power is greater than the second output power.

10. A vehicle battery charge state control device, characterized in that: include: A first acquisition module, used for acquiring a current state of charge of a power battery system of the vehicle when the vehicle is started; A second acquisition module, used to determine whether the current state of charge is greater than a preset state of charge, and obtain a first judgment result; wherein the preset state of charge is determined according to a battery temperature in the power battery system; The first processing module is used to control the power state of the vehicle according to the first judgment result; wherein the power state is the power matching state of the range extender of the vehicle and the power battery system.

11. An electronic device, comprising: A processor, a memory, and a program or instruction stored in the memory and executable on the processor; characterized in that when the processor executes the program or instruction, the method for controlling the state of charge of a vehicle battery as described in any one of claims 1 to 9 is implemented.

12. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by the processor, the steps in the method for controlling the state of charge of a vehicle battery as described in any one of claims 1 to 9 are implemented.

13. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the steps of the method for controlling the state of charge of a vehicle battery as described in any one of claims 1 to 9.

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