New energy vehicle low-voltage energy management method, device, equipment and medium

Abstract

The invention discloses a low-voltage energy management method, device and equipment for a new energy vehicle and a medium, and belongs to the technical field of vehicles. The new energy vehicle comprises a low-voltage electric appliance and a low-voltage power supply system, the low-voltage power supply system comprises a power battery, a direct current-direct current converter and a storage battery, and the method comprises the steps that the power state of the new energy vehicle, a first working parameter of the storage battery, a second working parameter of the direct current-direct current converter and a third working parameter of the power battery are obtained; if the power supply state is a power-on state, determining a power limit level of the low-voltage electric appliance according to at least one of the first working parameter, the second working parameter and the third working parameter; and adjusting the power of the corresponding low-voltage electric appliance according to the power limit grade. According to the method, the required power of the low-voltage electrical appliance is matched with the actual output power of the low-voltage power supply system, so that the important low-voltage electrical appliance is ensured to work normally, and the safety and reliability of whole vehicle driving are improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a low-voltage energy management method, device, equipment and medium for new energy vehicles. Background Art

[0002] New energy vehicles convert the high voltage output of the power battery into low voltage through a DC-DC converter to supply power to low-voltage electrical appliances and batteries. The batteries are also used to provide power to low-voltage electrical appliances. Therefore, the power battery, DC-DC converter and battery constitute a low-voltage power supply system for low-voltage electrical appliances. However, the disadvantages of low energy density and short cycle life of batteries may cause insufficient power supply capacity of the low-voltage power supply system, resulting in poor performance of some low-voltage electrical appliances, which in turn affects the user experience and even causes the entire vehicle to break down.

[0003] In the related technology, the output voltage of the DC-DC converter is adjusted according to the current state of the battery, so that the charging current of the battery is zero. This can avoid the deviation between the output voltage and the fully charged open circuit voltage caused by the internal resistance of the battery during the charging and discharging process, and thus can more accurately control the charging state of the battery, avoid the energy loss problem caused by floating charge / overcharge of the battery, and improve the power supply capacity of the low-voltage power supply system.

[0004] As users' demands for new energy vehicle functions continue to increase, there are more and more on-board electrical appliances, and the required power of low-voltage electrical appliances is getting higher and higher. Even if the power supply capacity of the low-voltage power supply system is improved through the above method, the actual output power of the low-voltage power supply system will still be less than the required power, causing some important low-voltage electrical appliances to work abnormally and affect the safety of vehicle driving. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a low-voltage energy management method, device, equipment and medium for new energy vehicles that solve the above problems. The power limit level of low-voltage electrical appliances can be determined according to the working parameters of the battery, DC-DC converter and power battery, and the power of different low-voltage electrical appliances can be limited according to different power limit levels, so that the final required power of the low-voltage electrical appliances matches the actual output power of the low-voltage power supply system, so as to ensure that important low-voltage electrical appliances work normally and improve the safety and reliability of vehicle driving.

[0006] In a first aspect, the present invention provides a low-voltage energy management method for a new energy vehicle, wherein the new energy vehicle comprises a low-voltage electrical appliance and a low-voltage power supply system, wherein the low-voltage power supply system comprises a power battery, a DC-DC converter and a storage battery, and the method comprises:

[0007] Acquire the power state of the new energy vehicle, the first operating parameter of the battery, the second operating parameter of the DC-DC converter, and the third operating parameter of the power battery;

[0008] If the power supply state is a power-on state, determining a power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter;

[0009] The power of the corresponding low-voltage electrical appliance is adjusted according to the power limit level.

[0010] Optionally, the first operating parameter includes a discharge current, a discharge capacity, and an actual voltage, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes:

[0011] If the discharge current is greater than a preset current threshold, the discharge capacity is greater than a preset first capacity threshold and less than a preset second capacity threshold, and the actual voltage is less than a preset first voltage threshold and greater than a preset second voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level one;

[0012] If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the second capacity threshold and less than a preset third capacity threshold, and the actual voltage is less than or equal to the second voltage threshold and greater than a preset third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level 2;

[0013] If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the third capacity threshold, and the actual voltage is less than or equal to the third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level three;

[0014] Among them, the restriction degrees of the first level, the second level and the third level increase successively.

[0015] Optionally, after adjusting the power of the corresponding low-voltage electrical appliance according to the power limit level, the method further includes:

[0016] Obtaining the charging ampere-hours and remaining power of the battery;

[0017] If the charging ampere-hours are greater than a preset charging threshold, or the rising proportion of the remaining power is greater than a preset proportion threshold, the power limitation of the low-voltage electrical appliance is stopped.

[0018] Optionally, the power-on state includes a high-voltage state, the first operating parameter includes a discharge capacity and a remaining power, the second operating parameter includes a high-voltage side voltage and an activation power limit flag, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes:

[0019] If the power-on state is the high-voltage state, the remaining power is less than the preset power threshold, the discharge capacity is greater than the preset first capacity threshold, and the high-voltage side voltage is less than the preset fourth voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level two;

[0020] If the power-on state is the high voltage state, the remaining power is less than the power threshold, the discharge capacity is greater than the first capacity threshold, and the limit flag is in the limit state, then the power limit level of the low voltage electrical appliance is determined to be level 2;

[0021] The power limitation levels include level one, level two and level three with increasing limitation degrees.

[0022] Optionally, after adjusting the power of the corresponding low-voltage electrical appliance according to the power limit level, the method further includes:

[0023] Obtaining the charging ampere-hours of the battery;

[0024] If the charging ampere-hour is greater than a preset charging threshold, then stop limiting the power of the low-voltage electrical appliance;

[0025] If the remaining power is greater than or equal to the power threshold, the restriction flag is in a non-restricted state, and the high-voltage side voltage is greater than or equal to the fourth voltage threshold, then the power restriction of the low-voltage electrical appliance is stopped.

[0026] Optionally, the power-on state includes a ready state, the third operating parameter includes a dischargeable power, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes:

[0027] Obtain the model of the vehicle;

[0028] If the model is an extended-range model and the power-on state is the ready state, obtaining the required power of the low-voltage electrical appliance;

[0029] Calculating the difference between the dischargeable power and the required power;

[0030] If the difference is less than a preset difference threshold, determining that the power limit level of the low-voltage electrical appliance is level three;

[0031] The power limitation levels include level one, level two and level three with increasing limitation degrees.

[0032] Optionally, the method further includes:

[0033] If the difference is greater than or equal to the difference threshold, the power of the low-voltage electrical appliance is not limited.

[0034] In a second aspect, the present invention provides a low-voltage energy management device for a new energy vehicle, wherein the new energy vehicle comprises a low-voltage electrical appliance and a low-voltage power supply system, wherein the low-voltage power supply system comprises a power battery, a DC-DC converter and a storage battery, and the device comprises:

[0035] An acquisition module, used to acquire the power state of the new energy vehicle, the first operating parameter of the battery, the second operating parameter of the DC-DC converter and the third operating parameter of the power battery;

[0036] a determination module, configured to determine the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter and the third operating parameter if the power supply state is a power-on state;

[0037] The regulating module is used to regulate the power of the corresponding low-voltage electrical appliance according to the power limit level.

[0038] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0039] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0040] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0041] A method, device, equipment and medium for low-voltage energy management of new energy vehicles provided by an embodiment of the present invention, wherein the new energy vehicle comprises a low-voltage electrical appliance and a low-voltage power supply system, wherein the low-voltage power supply system comprises a power battery, a DC-DC converter and a storage battery, wherein the power supply state of the vehicle, a first operating parameter of the storage battery, a second operating parameter of the DC-DC converter and a third operating parameter of the power battery are obtained, the use of the low-voltage power supply system is understood through the power supply state, and the working state of the low-voltage power supply system is reflected through the first operating parameter, the second operating parameter and the third operating parameter; if the power supply state is a power-on state, the power limit level of the low-voltage electrical appliance is determined according to at least one of the first operating parameter, the second operating parameter and the third operating parameter, and during the use of the low-voltage power supply system, the power limit level of the low-voltage electrical appliance is determined according to its working state, and different working states correspond to different corresponding limit levels, and the power-on state includes a high-voltage state or a ready state; the power of the corresponding low-voltage electrical appliance is limited according to the power limit level, and after the power of the low-voltage electrical appliance is limited, the required power of the low-voltage electrical appliance is matched with the actual output power of the low-voltage power supply system, so as to ensure that important low-voltage electrical appliances work normally and improve the safety and reliability of vehicle driving.

[0042] 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

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0044] Figure 1 is a flow chart of a low-voltage energy management method for new energy vehicles provided by an embodiment of the present invention;

[0045] Figure 2 It is a structural block diagram of a low-voltage energy management device for new energy vehicles provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation mode of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0047] Before introducing in detail a low-voltage energy management method for new energy vehicles provided by an embodiment of the invention, a brief introduction to the implementation environment involved is first given.

[0048] One of the main differences between the low-voltage power supply system of new energy vehicles and traditional fuel vehicles is that there is no AC generator, but a DC-to-DC converter (DCDC) instead. DCDC converts the high voltage of the power battery into low voltage, supplies power to low-voltage electrical appliances (for example, lighting fixtures, wipers, controllers, horns, etc.) and charges the battery, which also supplies power to low-voltage electrical appliances. In other words, new energy vehicles include low-voltage electrical appliances and a low-voltage power supply system, and the low-voltage power supply system includes a power battery, a DC-to-DC converter and a battery.

[0049] Figure 1 is a flow chart of a low-voltage energy management method for new energy vehicles provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes step S110, step S120 and step S130.

[0050] Step S110, obtaining the power state of the vehicle, the first operating parameter of the battery, the second operating parameter of the DC-DC converter, and the third operating parameter of the power battery.

[0051] In this embodiment, the power supply status of the new energy vehicle includes OFF state, ready state and high-voltage state. In the OFF state, the vehicle is completely shut down and all electrical systems are not working; in the ready state, the low-voltage power supply system is activated, the vehicle is fully prepared, the engine start conditions are met, and the vehicle can start at any time; in the high-voltage state, the engine starts successfully. The power supply status can reflect whether the low-voltage power supply system is activated and whether the engine is started.

[0052] Among them, the first operating parameter of the battery, the second operating parameter of the DC-DC converter and the third operating parameter of the power battery can be obtained from the battery management system of the vehicle.

[0053] Step S120: If the power state is the power-on state, determine the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter and the third operating parameter.

[0054] The power-on state includes a high voltage state or a ready state.

[0055] In this embodiment, the low-voltage power supply system is activated when the vehicle is powered on. When the low-voltage power supply system is activated, the power supply capacity of the low-voltage power supply system can be reflected by the first operating parameter, the second operating parameter and the third operating parameter. The power limit level of the low-voltage electrical appliance is determined according to its power supply capacity, and different power supply capacities correspond to different limit levels.

[0056] The power limit level includes an unlimited power level and a limited power level. That is to say, if the power supply capacity of the low-voltage power supply system is strong, the power limit level of the low-voltage electrical appliances can be determined as an unlimited power level; if the power supply capacity of the low-voltage power supply system is weak, the power limit level of the low-voltage electrical appliances can be determined as a limited power level.

[0057] In this embodiment, when the first working parameter indicates that the output capacity is limited due to battery aging, the second working parameter indicates that the output capacity of DCDC is limited due to a fault or other physical factors, or the third working parameter indicates that the discharge capacity of the power battery is limited under low power and low temperature environments, the power supply capacity of the low-voltage power supply system will decrease. At this time, if the power demand of the low-voltage electrical appliances is too high, the power supply capacity of the low-voltage power supply system may not be able to meet it, so it is necessary to limit the power of the low-voltage electrical appliances and reduce the power of unnecessary low-voltage power supplies. When the first working parameter indicates that the output capacity of the battery is normal, the second working parameter indicates that the output capacity of DCDC is normal, and the third working parameter indicates that the discharge capacity of the power battery is normal, the power supply capacity of the low-voltage power supply system is normal. At this time, the power supply capacity of the low-voltage power supply system can meet the power demand of the low-voltage electrical appliances, so there is no need to limit the power of the low-voltage electrical appliances.

[0058] Step S130: adjusting the power of the corresponding low-voltage electrical appliance according to the power limit level.

[0059] In the present embodiment, if the power limit level is a level that does not limit power, the power of all low-voltage electrical appliances is not limited. If the power limit level is a level that limits power, the power of the corresponding low-voltage electrical appliances is reduced. Among them, many low-voltage electrical appliances have multiple gears, and different gears correspond to different power levels, so the corresponding low-voltage electrical appliance gear can be adjusted according to the power limit level to achieve the power limitation of the low-voltage electrical appliances. After limiting the power of the low-voltage electrical appliances, the final required power of the low-voltage electrical appliances will be matched with the actual output power of the low-voltage power supply system. Even if the power supply capacity of the low-voltage power supply system can meet the power demand of the low-voltage electrical appliances, the level with the highest degree of restriction will ensure that important low-voltage electrical appliances work normally, thereby improving the safety and reliability of vehicle driving.

[0060] Optionally, the first operating parameter includes discharge current, discharge capacity and actual voltage, and step S120 includes step S1201, step S1202 and step S1203.

[0061] Step S1201: If the discharge current is greater than a preset current threshold, the discharge capacity is greater than a preset first capacity threshold and less than a preset second capacity threshold, and the actual voltage is less than a preset first voltage threshold and greater than a preset second voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level one.

[0062] The power limit levels include level 1, level 2 and level 3, and the degree of limit increases in order. The power limit level also includes level 0, which is a level with no power limit.

[0063] Exemplarily, low-voltage electrical appliances include air conditioners, seats, audio, lighting, and comfort appliances. Different low-voltage electrical appliances have different gears under different power limit levels. The corresponding relationship between the gears of low-voltage electrical appliances and the power limit levels is shown below:

[0064] Table 1

[0065]

[0066]

[0067] Among them, the low-voltage electrical appliances are turned off, which means that the power demand of the low-voltage electrical appliances is 0, that is, the kinetic energy is not enabled. In the level 0 scenario, it means that the working condition of the low-voltage power supply system is good, and the power demand of the low-voltage electrical appliances is within the DCDC output capacity, so there is no unified restriction; in the level 1, level 2 and level 3 scenarios, different levels of restriction will be triggered according to different working parameters, and the power demand of the low-voltage electrical appliances will be restricted or forced to shut down.

[0068] In this embodiment, if the cumulative number of charge and discharge cycles of the battery exceeds a certain number, the actual capacity will decay, and the complex vehicle-side power usage scenario may easily cause unexpected battery life aging. As the battery ages, its output capacity will also deteriorate, and the user cannot predict such situations in advance while the vehicle is driving. Therefore, a low-voltage energy management method is referenced, and the degree of limitation of the battery's output capacity is reflected through the first working parameter of the battery, which is equivalent to determining the power limit level of the low-voltage electrical appliance according to the degree of limitation of the output capacity, so that the total required power of all low-voltage electrical appliances matches the output capacity of the battery.

[0069] Specifically, if the discharge current of the battery is greater than the preset current threshold, it means that the battery is in a discharging state, the discharge capacity is greater than the preset first capacity threshold and less than the preset second capacity threshold, and the actual voltage is less than the preset first voltage threshold and greater than the preset second voltage threshold, indicating that the battery output capacity is limited, then the power limit level of the low-voltage electrical appliances is determined to be level one, the power of some low-voltage electrical appliances is reduced, and the total required power of all low-voltage electrical appliances is slightly reduced.

[0070] Step S1202: If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the second capacity threshold and less than the preset third capacity threshold, and the actual voltage is less than or equal to the second voltage threshold and greater than the preset third voltage threshold, then determine that the power limit level of the low-voltage electrical appliance is level 2.

[0071] In this embodiment, if the discharge current is greater than the current threshold, it means that the battery is in a discharging state, the discharge capacity is greater than or equal to the second capacity threshold and less than the preset third capacity threshold, and the actual voltage is less than or equal to the second voltage threshold and greater than the preset third voltage threshold, which means that the battery output energy is somewhat seriously reduced. In this case, the power limit level of the low-voltage electrical appliances is determined to be level two, the power of most low-voltage electrical appliances is reduced, and the total required power of all low-voltage electrical appliances is greatly reduced.

[0072] Step S1203: if the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the third capacity threshold, and the actual voltage is less than or equal to the third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level three.

[0073] In this embodiment, if the discharge current is greater than the current threshold, it means that the battery is in a discharging state, the discharge capacity is greater than or equal to the third capacity threshold, and the actual voltage is less than or equal to the third voltage threshold, which means that the battery output capacity is seriously reduced. The power limit level of the low-voltage electrical appliances is determined to be level three, and low-voltage electrical appliances except for very important low-voltage electrical appliances are restricted from use, so that the total required power of all low-voltage electrical appliances is minimized, thereby extending the time that the battery can repair itself and the endurance of the vehicle under the power feeding state.

[0074] In this embodiment, when the power limit level of the low-voltage electrical appliance is determined only based on the discharge current, the discharge capacity and the actual voltage, if the discharge capacity is less than or equal to the first capacity threshold or the actual voltage is greater than or equal to the first voltage threshold, the power limit level of the low-voltage electrical appliance is determined to be level 0, or the power of the low-voltage electrical appliance is not limited.

[0075] Exemplarily, the first capacity threshold is 2AH, the second capacity threshold is 5AH, the third capacity threshold is 8AH, the first voltage threshold is 13V, the second voltage threshold is 12V, and the third voltage threshold is 10V.

[0076] Optionally, after step S130, the method further includes:

[0077] Obtain the battery charging ampere-hours and remaining power; if the charging ampere-hours are greater than a preset charging threshold, or the rising proportion of the remaining power is greater than a preset proportion threshold, stop limiting the power of the low-voltage electrical appliance.

[0078] In this embodiment, after the functions of low-voltage electrical appliances are restricted or prohibited, although it will not affect the normal driving of the vehicle, long-term restrictions will accelerate the attenuation of the battery capacity. Therefore, after the output capacity of the battery is improved, the restrictions on low-voltage electrical appliances will be lifted.

[0079] Exemplarily, the charging threshold is 2AH, and the rising ratio is 5%.

[0080] Specifically, when the power of low-voltage electrical appliances is limited in accordance with step S1201, step S1202 and step S1203, if it is found that the charging ampere-hours of the battery are greater than the preset charging threshold or the increase ratio of the remaining power is greater than the preset ratio threshold, it means that the output capacity of the battery is recovering and the recovery speed is relatively fast. At this time, the power limitation of the low-voltage electrical appliances can be stopped.

[0081] Optionally, the first operating parameter includes the discharge capacity and the remaining power, the second operating parameter includes the high-voltage side voltage and the limit flag of the activation power, and step S120 also includes step S1204 and step S1205.

[0082] Step S1204: if the power-on state is a high voltage state, the remaining power is less than a preset power threshold, the discharge capacity is greater than a preset first capacity threshold, and the high voltage side voltage is less than a preset fourth voltage threshold, then determine that the power limit level of the low voltage electrical appliance is level 2.

[0083] As mentioned above, the power limit levels include level 1, level 2 and level 3 with increasing limit levels, which will not be described in detail here.

[0084] In this embodiment, if a real fault occurs in the DCDC, it is usually impossible to recover in real time, and the vehicle needs to be powered off for fault inspection and repair. Before the inspection and repair, the output capacity of the low-voltage power supply system will be reduced, causing the power demand of the low-voltage electrical appliances to be unable to be met. Therefore, a low-voltage energy management method should also be introduced during the use of the DCDC. The output capacity of the DCDC is reflected by the second working parameter of the DCDC, and the power limit level of the low-voltage electrical appliances is determined according to the output capacity of the DCDC. When the output capacity of the DCDC deteriorates, the power of the low-voltage electrical appliances is limited to ensure that the driver and passengers have enough time to identify the risks of the current vehicle and pull over in time.

[0085] Specifically, if the power-on state is a high-voltage state, it means that there is input on the high-voltage side of the DC-DC converter, the remaining power is less than the preset power threshold, and the discharge capacity is greater than the preset first capacity threshold, which means that the output capacity of the battery is a bit poor, and the high-voltage side voltage of DCDC is less than the preset fourth voltage threshold, which means that the output capacity of DCDC may be limited due to undervoltage. When the above conditions are met at the same time, it means that the power supply capacity of the low-voltage power supply system is relatively weak. In order to prevent important low-voltage electrical appliances from failing to work normally, at this time, the power of most low-voltage electrical appliances is limited, and the low-voltage power demand is limited so that the low-voltage power demand matches the power supply capacity of the low-voltage power supply system to ensure that important low-voltage electrical appliances can work normally and reduce the driving risk of the vehicle.

[0086] Exemplarily, the fourth voltage threshold is 300V, and the power threshold is 80%.

[0087] Step S1205: If the power-on state is a high voltage state, the remaining power is less than the power threshold, the discharge capacity is greater than the first capacity threshold, and the limit flag is a limit state, then the power limit level of the low voltage electrical appliance is determined to be level two.

[0088] In this embodiment, when the vehicle is in a high-voltage state, if the output capacity of the battery is poor, and the DCDC may be triggered by physical factors such as over-temperature, over-current, under-voltage, etc., causing the power limit flag of the DCDC to be greatly reduced, it is necessary to limit the power of most low-voltage electrical appliances to a relatively low level to reduce the total required power of the low-voltage electrical appliances and ensure that the low-voltage power supply system of the entire vehicle remains in a stable state.

[0089] Optionally, after step S130, the method further includes:

[0090] Obtain the battery charging ampere-hours; if the charging ampere-hours are greater than the preset charging threshold, stop limiting the power of the low-voltage electrical appliance; if the remaining power is greater than or equal to the power threshold, the restriction flag is in the non-restricted state and the high-voltage side voltage is greater than or equal to the fourth voltage threshold, stop limiting the power of the low-voltage electrical appliance.

[0091] In this embodiment, when the power of low-voltage electrical appliances is limited through step S1204 and step S1205, after waiting for the output capacity of DCDC to return to normal, the limitation can be exited and the low-voltage electrical appliances of the vehicle can continue to be used normally.

[0092] Specifically, if the battery's charging ampere-hours are greater than the charging threshold, it means that the battery's power supply capacity is relatively strong, thereby making the power supply capacity of the low-voltage power supply system stronger, and at this time, all power requirements of low-voltage electrical appliances can be met, so the power restriction of low-voltage electrical appliances can be stopped. Alternatively, if the battery's remaining power is high, the output power of the DCDC is not restricted, and the DCDC is not undervoltage, it means that the output capacity of the DCDC has been restored, and the battery's power supply capacity is sufficient. At this time, the low-voltage power supply system has a strong power supply capacity, which can meet all power requirements of low-voltage electrical appliances, and there is no need to restrict the power of low-voltage electrical appliances.

[0093] Exemplarily, the charging threshold is 2AH.

[0094] Optionally, the third operating parameter includes dischargeable power, and step S120 includes step S1206, step S1207, step S1208 and step S1209.

[0095] Step S1206: Obtain the model of the vehicle.

[0096] In this embodiment, the power battery will limit its own discharge capacity in order to protect the life of the battery cell in low temperature and low power scenarios. If more low-voltage electrical appliances are turned on at this time, the required power of DCDC will be greater, resulting in competition between DCDC and the high-voltage engine for power. However, in order to ensure that the engine can be started successfully, it is necessary to limit the power consumption of low-voltage electrical appliances when the discharge capacity of the power battery is weak, and use the discharge capacity of the power battery for engine starting as much as possible to prevent the vehicle from being unusable. Among them, the vehicle model reflects whether the vehicle has an engine.

[0097] Step S1207: If the model is an extended-range model and the power-on state is a ready state, the required power of the low-voltage electrical appliance is obtained.

[0098] In this embodiment, if the model is an extended-range type, it means that the vehicle has an engine. At this time, the vehicle is in a ready state, which means that the engine has not been started and there is no fault that prohibits starting, and the starting conditions are met.

[0099] Step S1208: Calculate the difference between the dischargeable power and the required power.

[0100] In this embodiment, it is calculated how much power is left after the power battery meets the power demand of the low-voltage electrical appliances, and then it is checked whether the remaining power is sufficient to start the engine.

[0101] Step S1209: If the difference is less than the preset difference threshold, determine that the power limit level of the low-voltage electrical appliance is level three.

[0102] In this embodiment, if the difference is less than the difference threshold, it means that after the power battery meets the power requirements of the low-voltage electrical appliances, the remaining power is insufficient to start the engine. Therefore, at this time, the power of the low-voltage electrical appliances should be limited to the minimum as much as possible to ensure that there is enough power to start the engine and prevent the vehicle from breaking down.

[0103] Optionally, the method further includes:

[0104] If the difference is greater than or equal to the difference threshold, the power of the low-voltage electrical appliance is not restricted.

[0105] In this embodiment, if there is enough power to start the engine, there is no need to limit the power of the low-voltage electrical appliances, or the power limit level of the low-voltage electrical appliances is determined to be level 0. If the vehicle type is a non-range extended vehicle type and the power state is a non-ready state, that is, the vehicle has no engine, or the vehicle has not entered a state to start the engine, the third operating parameter is not considered when determining the power limit level of the low-voltage electrical appliances. Among them, the non-ready state refers to other states except the ready state.

[0106] In this embodiment, if the power limit level of the low-voltage electrical appliance is determined based on the first operating parameter, the second operating parameter and the third operating parameter, and multiple power limit levels are determined, the power limit level with a high degree of limitation is finally selected to limit the power of the low-voltage electrical appliance.

[0107] Based on the same inventive concept, an embodiment of the present invention further provides a low-voltage energy management device for a new energy vehicle, wherein the new energy vehicle comprises a low-voltage electrical appliance and a low-voltage power supply system, wherein the low-voltage power supply system comprises a power battery, a DC-DC converter and a storage battery. Figure 2 is a structural block diagram of a low-voltage energy management device for new energy vehicles provided by an embodiment of the present invention, such as Figure 2 As shown, the device 200 includes an acquisition module 201 , a determination module 202 and an adjustment module 203 .

[0108] An acquisition module 201 is used to acquire a power state of the vehicle, a first operating parameter of the battery, a second operating parameter of the DC-DC converter, and a third operating parameter of the power battery;

[0109] A determination module 202, for determining a power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter or the third operating parameter if the power supply state is a power-on state, the power-on state including a high-voltage state or a ready state;

[0110] The regulating module 203 is used to regulate the power of the corresponding low-voltage electrical appliance according to the power limit level.

[0111] Optionally, the first operating parameter includes a discharge current, a discharge capacity, and an actual voltage, and the determination module 202 is further configured to:

[0112] If the discharge current is greater than the preset current threshold, the discharge capacity is greater than the preset first capacity threshold and less than the preset second capacity threshold, and the actual voltage is less than the preset first voltage threshold and greater than the preset second voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level one;

[0113] If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the second capacity threshold and less than the preset third capacity threshold, and the actual voltage is less than or equal to the second voltage threshold and greater than the preset third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level 2;

[0114] If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the third capacity threshold, and the actual voltage is less than or equal to the third voltage threshold, the power limit level of the low-voltage electrical appliance is determined to be level three;

[0115] Among them, the degree of restriction increases successively at levels one, two and three.

[0116] Optionally, the device 200 further includes a second stopping module, configured to:

[0117] Get the battery charging ampere-hours and remaining power;

[0118] If the charging ampere-hours are greater than a preset charging threshold, or the rising proportion of the remaining power is greater than a preset proportion threshold, the power restriction of the low-voltage electrical appliance is stopped.

[0119] Optionally, the power-on state includes a high voltage state, the first operating parameter includes a discharge capacity and a remaining power, the second operating parameter includes a high voltage side voltage and a limit flag bit of the activation power, and the determination module 202 is further used to:

[0120] If the power-on state is a high voltage state, the remaining power is less than a preset power threshold, the discharge capacity is greater than a preset first capacity threshold, and the high voltage side voltage is less than a preset fourth voltage threshold, then the power limit level of the low voltage electrical appliance is determined to be level 2;

[0121] If the power-on state is a high voltage state, the remaining power is less than the power threshold, the discharge capacity is greater than the first capacity threshold, and the limit flag is in a limit state, the power limit level of the low-voltage electrical appliance is determined to be level 2;

[0122] The power limit levels include level one, level two and level three with increasing degree of limit.

[0123] Optionally, the device 200 further includes a first stopping module, configured to:

[0124] Get the battery charging ampere-hours;

[0125] If the charging ampere-hour is greater than the preset charging threshold, the power limitation of the low-voltage electrical appliance will be stopped;

[0126] If the remaining power is greater than or equal to the power threshold, the limit flag is in a non-limiting state, and the high-voltage side voltage is greater than or equal to a fourth voltage threshold, then the power limitation of the low-voltage electrical appliance is stopped.

[0127] Optionally, the power-on state includes a ready state, the third operating parameter includes a dischargeable power, and the determination module 202 is further configured to:

[0128] Get the vehicle model;

[0129] If the model is an extended-range model and the power-on state is ready, the required power of the low-voltage electrical appliance is obtained;

[0130] Calculate the difference between the dischargeable power and the required power;

[0131] If the difference is less than the preset difference threshold, the power limit level of the low-voltage electrical appliance is determined to be level three;

[0132] The power limit levels include level one, level two and level three with increasing degree of limit.

[0133] Optionally, the device 200 further includes a control module, configured to:

[0134] If the difference is greater than or equal to the difference threshold, the power of the low-voltage electrical appliance is not restricted.

[0135] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0136] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0137] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips.

[0138] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0139] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0140] The processor implements any one of the low-voltage energy management methods for new energy vehicles in the above-mentioned embodiments by reading and executing computer program instructions stored in the memory.

[0141] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0142] In addition, in combination with the low-voltage energy management method for new energy vehicles in the above embodiments, the embodiments of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the low-voltage energy management methods for new energy vehicles in the above embodiments is implemented.

[0143] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0144] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0145] A method, device, equipment and medium for low-voltage energy management of new energy vehicles provided by an embodiment of the present invention, wherein the new energy vehicle comprises a low-voltage electrical appliance and a low-voltage power supply system, wherein the low-voltage power supply system comprises a power battery, a DC-DC converter and a storage battery, wherein the power supply state of the vehicle, a first operating parameter of the storage battery, a second operating parameter of the DC-DC converter and a third operating parameter of the power battery are obtained, the use of the low-voltage power supply system is understood through the power supply state, and the working state of the low-voltage power supply system is reflected through the first operating parameter, the second operating parameter and the third operating parameter; if the power supply state is a power-on state, the power limit level of the low-voltage electrical appliance is determined according to at least one of the first operating parameter, the second operating parameter and the third operating parameter, and during the use of the low-voltage power supply system, the power limit level of the low-voltage electrical appliance is determined according to its working state, and different working states correspond to different corresponding limit levels, and the power-on state includes a high-voltage state or a ready state; the power of the corresponding low-voltage electrical appliance is limited according to the power limit level, and after the power of the low-voltage electrical appliance is limited, the required power of the low-voltage electrical appliance is matched with the actual output power of the low-voltage power supply system, so as to ensure that important low-voltage electrical appliances work normally and improve the safety and reliability of vehicle driving.

[0146] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0147] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0148] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A low-voltage energy management method for new energy vehicles, characterized in that: The new energy vehicle includes low-voltage electrical appliances and a low-voltage power supply system, wherein the low-voltage power supply system includes a power battery, a DC-DC converter and a storage battery, and the method includes: Acquire the power state of the new energy vehicle, the first operating parameter of the battery, the second operating parameter of the DC-DC converter, and the third operating parameter of the power battery; If the power supply state is a power-on state, determining a power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter; The power of the corresponding low-voltage electrical appliance is adjusted according to the power limit level.

2. The low-voltage energy management method for new energy vehicles according to claim 1 is characterized in that: The first operating parameter includes a discharge current, a discharge capacity, and an actual voltage, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes: If the discharge current is greater than a preset current threshold, the discharge capacity is greater than a preset first capacity threshold and less than a preset second capacity threshold, and the actual voltage is less than a preset first voltage threshold and greater than a preset second voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level one; If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the second capacity threshold and less than a preset third capacity threshold, and the actual voltage is less than or equal to the second voltage threshold and greater than a preset third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level 2; If the discharge current is greater than the current threshold, the discharge capacity is greater than or equal to the third capacity threshold, and the actual voltage is less than or equal to the third voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level three; Among them, the restriction degrees of the first level, the second level and the third level increase successively.

3. The low-voltage energy management method for new energy vehicles according to claim 2 is characterized in that: After adjusting the power of the corresponding low-voltage electrical appliance according to the power limit level, the method further includes: Obtaining the charging ampere-hours and remaining power of the battery; If the charging ampere-hours are greater than a preset charging threshold, or the rising proportion of the remaining power is greater than a preset proportion threshold, the power limitation of the low-voltage electrical appliance is stopped.

4. The low-voltage energy management method for new energy vehicles according to claim 1 is characterized in that: The power-on state includes a high-voltage state, the first operating parameter includes a discharge capacity and a remaining power, the second operating parameter includes a high-voltage side voltage and an activation power limit flag, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes: If the power-on state is the high-voltage state, the remaining power is less than the preset power threshold, the discharge capacity is greater than the preset first capacity threshold, and the high-voltage side voltage is less than the preset fourth voltage threshold, then the power limit level of the low-voltage electrical appliance is determined to be level two; If the power-on state is the high voltage state, the remaining power is less than the power threshold, the discharge capacity is greater than the first capacity threshold, and the limit flag is in the limit state, then the power limit level of the low voltage electrical appliance is determined to be level 2; The power limitation levels include level one, level two and level three with increasing limitation degrees.

5. The low-voltage energy management method for new energy vehicles according to claim 4 is characterized in that: After adjusting the power of the corresponding low-voltage electrical appliance according to the power limit level, the method further includes: Obtaining the charging ampere-hours of the battery; If the charging ampere-hour is greater than a preset charging threshold, then stop limiting the power of the low-voltage electrical appliance; If the remaining power is greater than or equal to the power threshold, the restriction flag is in a non-restricted state, and the high-voltage side voltage is greater than or equal to the fourth voltage threshold, then the power restriction of the low-voltage electrical appliance is stopped.

6. The low-voltage energy management method for new energy vehicles according to claim 1 is characterized in that: The power-on state includes a ready state, the third operating parameter includes a dischargeable power, and determining the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter, and the third operating parameter includes: Obtain the model of the vehicle; If the model is an extended-range model and the power-on state is the ready state, obtaining the required power of the low-voltage electrical appliance; Calculating the difference between the dischargeable power and the required power; If the difference is less than a preset difference threshold, determining that the power limit level of the low-voltage electrical appliance is level three; The power limitation levels include level one, level two and level three with increasing limitation degrees.

7. The low-voltage energy management method for new energy vehicles according to claim 6 is characterized in that: The method further comprises: If the difference is greater than or equal to the difference threshold, the power of the low-voltage electrical appliance is not limited.

8. A low-voltage energy management device for new energy vehicles, characterized in that: The new energy vehicle includes low-voltage electrical appliances and a low-voltage power supply system, wherein the low-voltage power supply system includes a power battery, a DC-DC converter and a storage battery, and the device includes: An acquisition module, used to acquire the power state of the new energy vehicle, the first operating parameter of the battery, the second operating parameter of the DC-DC converter and the third operating parameter of the power battery; a determination module, configured to determine the power limit level of the low-voltage electrical appliance according to at least one of the first operating parameter, the second operating parameter and the third operating parameter if the power supply state is a power-on state; The regulating module is used to regulate the power of the corresponding low-voltage electrical appliance according to the power limit level.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 7.

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