A heater control method and device for electric vehicle during low temperature charging

Abstract

A method and device for controlling a heater during low-temperature charging of an electric vehicle, comprising: identifying the maximum discharge power of a power battery, judging whether the maximum discharge power is greater than the highest-speed working power of the heater; if not, judging whether the maximum discharge power is greater than the lowest-speed working power of the heater; if so, controlling the heater to perform a heating operation at the lowest speed; controlling a charging pile to supply power to the power battery and the heater, and superimposing the power supplied by the charging pile to the heater and the lowest-speed working power to obtain a comprehensive power supply power; judging whether the comprehensive power supply power is greater than the middle-speed working power of the heater; if so, controlling the heater to perform a heating operation at the middle speed; when the heater is working stably, judging whether the middle speed is a preset required speed; if so, maintaining the heater to perform a heating operation, so as to ensure the heating capacity of the heater in a low-temperature environment, thereby facilitating improving the charging efficiency of the charging pile for the electric vehicle.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and more specifically, to a method and device for controlling a heater during low-temperature charging of an electric vehicle. Background Art

[0002] Current electric vehicles usually use charging piles to charge their power batteries. However, in low temperature environments, the heater needs to be started in advance before using the charging pile to charge the power batteries, because in low temperature environments, charging can only be carried out effectively after the heater is started.

[0003] However, it is found in practice that the above-mentioned heater is usually heated by power batteries. In low temperature environments, the discharge capacity of the power batteries will be affected, thereby affecting the heating efficiency of the heater, and further affecting the charging efficiency of the charging pile for the electric vehicle. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a method and device for controlling a heater when an electric vehicle is charged at low temperature, which can ensure the heating capacity of the heater in a low temperature environment, thereby facilitating improving the charging efficiency of the charging pile for the electric vehicle.

[0005] A first aspect of an embodiment of the present application provides a method for controlling a heater during low-temperature charging of an electric vehicle, comprising:

[0006] Identify the maximum discharge power of the power battery, and determine whether the maximum discharge power is greater than the highest working power of the heater;

[0007] When the maximum discharge power is not greater than the highest-grade working power, determining whether the maximum discharge power is greater than the lowest-grade working power of the heater;

[0008] When the maximum discharge power is greater than the lowest working power of the heater, the heater is controlled to perform heating operation at the lowest gear;

[0009] Controlling the charging pile to supply power to the power battery and the heater, and superimposing the power supplied by the charging pile to the heater and the lowest gear working power to obtain a comprehensive power supply power;

[0010] Determining whether the comprehensive power supply is greater than the middle-level working power of the heater;

[0011] When the comprehensive power supply is greater than the intermediate working power, the heater is controlled to perform heating operation according to the intermediate gear;

[0012] When the heater is working stably, determining whether the intermediate gear is a preset required gear;

[0013] When the intermediate gear is the required gear, the heater is maintained to perform a heating operation.

[0014] In the above implementation process, the maximum discharge power of the power battery is identified, and it is determined whether the maximum discharge power is greater than the highest working power of the heater; when the maximum discharge power is not greater than the highest working power, it is determined whether the maximum discharge power is greater than the lowest working power of the heater; when the maximum discharge power is greater than the lowest working power of the heater, the heater is controlled to perform heating operation at the lowest gear; the charging pile is controlled to supply power to the power battery and the heater, and the power supply power of the charging pile to the heater and the lowest working power are superimposed to obtain the comprehensive power supply power; it is determined whether the comprehensive power supply power is greater than the middle working power of the heater; when the comprehensive power supply power is greater than the middle working power, the heater is controlled to perform heating operation at the middle gear; when the heater works stably, it is determined whether the middle gear is the preset required gear; when the middle gear is the required gear, the heater is maintained to perform heating operation. It can be seen that the implementation of this implementation method can ensure the heating capacity of the heater in a low temperature environment, which is conducive to improving the charging efficiency of the charging pile for electric vehicles.

[0015] Furthermore, the method further comprises:

[0016] When the maximum discharge power is greater than the highest-level operating power, the heater is controlled to perform a heating operation according to a preset required level.

[0017] Furthermore, the method further comprises:

[0018] When the maximum discharge power is not greater than the lowest operating power of the heater, the heating operation is performed through the power battery relay.

[0019] Furthermore, the method further comprises:

[0020] When the comprehensive power supply power is not greater than the intermediate working power, detecting whether the maximum discharge power is greater than the intermediate working power;

[0021] When the maximum discharge power is greater than the intermediate working power, the step of controlling the heater to perform a heating operation at the intermediate gear is performed.

[0022] Furthermore, the method further comprises:

[0023] When the intermediate gear is not the required gear, the power supply of the charging pile to the heater and the intermediate gear working power are superimposed to obtain a comprehensive power supply power, and the step of determining whether the comprehensive power supply power is greater than the intermediate gear working power of the heater is performed.

[0024] Furthermore, the method further comprises:

[0025] determining whether a downshift demand is detected;

[0026] When the downshift requirement is detected, obtaining a target power supply current corresponding to the current heating gear position;

[0027] Controlling the charging pile to reduce the power supply current of the power battery and the heater to the target power supply current, and reducing the current heating gear by one gear to obtain an updated heating gear;

[0028] Determining whether the updated heating gear is zero;

[0029] When the updated heating gear is the zero gear, controlling the heater to stop heating;

[0030] When the updated heating gear is not the zero gear, the updated heating gear is determined as the current heating gear, and the step of acquiring the target power supply current corresponding to the current heating gear is performed.

[0031] A second aspect of an embodiment of the present application provides a heater control device for low-temperature charging of an electric vehicle, the heater control device for low-temperature charging of an electric vehicle comprising:

[0032] An identification unit, used to identify the maximum discharge power of the power battery;

[0033] a judging unit, configured to judge whether the maximum discharge power is greater than the highest working power of the heater; and when the maximum discharge power is not greater than the highest working power, to judge whether the maximum discharge power is greater than the lowest working power of the heater;

[0034] a control unit, configured to control the heater to perform a heating operation at the lowest gear when the maximum discharge power is greater than the lowest gear working power of the heater; and control the charging pile to supply power to the power battery and the heater, and superimpose the power supplied by the charging pile to the heater and the lowest gear working power to obtain a comprehensive power supply power;

[0035] The judging unit is further used to judge whether the comprehensive power supply is greater than the middle gear working power of the heater;

[0036] The control unit is further used to control the heater to perform heating operation according to the intermediate gear when the comprehensive power supply is greater than the intermediate gear working power;

[0037] The judging unit is further configured to judge whether the intermediate gear is a preset required gear when the heater is working stably;

[0038] The heating unit is used to maintain the heater in a heating operation when the intermediate gear is the required gear.

[0039] In the above implementation process, the identification unit identifies the maximum discharge power of the power battery, the judgment unit judges whether the maximum discharge power is greater than the highest gear working power of the heater; and when the maximum discharge power is not greater than the highest gear working power, the judgment unit judges whether the maximum discharge power is greater than the lowest gear working power of the heater; the control unit controls the heater to perform heating operation according to the lowest gear when the maximum discharge power is greater than the lowest gear working power of the heater; and controls the charging pile to supply power to the power battery and the heater, and superimposes the power supply power of the charging pile to the heater and the lowest gear working power to obtain the comprehensive power supply power; the judgment unit judges whether the comprehensive power supply power is greater than the middle gear working power of the heater; the control unit controls the heater to perform heating operation according to the middle gear when the comprehensive power supply power is greater than the middle gear working power; the judgment unit judges whether the middle gear is the preset required gear after the heater works stably; the heating unit maintains the heater to perform heating operation when the middle gear is the required gear. It can be seen that the implementation of this embodiment can ensure the heating capacity of the heater in a low temperature environment, which is conducive to improving the charging efficiency of the charging pile for electric vehicles.

[0040] Furthermore, the control unit is also used to control the heater to perform heating operation according to a preset required gear when the maximum discharge power is greater than the highest-grade working power.

[0041] A third aspect of an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the heater control method for low-temperature charging of an electric vehicle as described in any one of the first aspect of the embodiment of the present application.

[0042] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the method for controlling a heater during low-temperature charging of an electric vehicle described in any one of the first aspect of the embodiment of the present application is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1A schematic flow chart of a method for controlling a heater during low-temperature charging of an electric vehicle provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the structure of a heater control device for low-temperature charging of an electric vehicle provided in an embodiment of the present application;

[0046] Figure 3 An exemplary schematic diagram of a heater rolling upshift coordination control method provided in an embodiment of the present application;

[0047] Figure 4 An exemplary schematic diagram of a coordinated control method for heater power difference upshifting provided in an embodiment of the present application;

[0048] Figure 5 An exemplary schematic diagram of a heater downshift coordination control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0050] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] Example 1

[0052] Please see Figure 1 , Figure 1 The present invention provides a flow chart of a method for controlling a heater when charging an electric vehicle at low temperature. The method for controlling a heater when charging an electric vehicle at low temperature includes:

[0053] S101, identifying the maximum discharge power of the power battery, and determining whether the maximum discharge power is greater than the highest working power of the heater, if yes, executing step S102; if no, executing step S103.

[0054] In this embodiment, the method may preferentially identify the current maximum discharge power of the power battery, and consider that the maximum discharge power refers to the current discharge capacity of the power battery.

[0055] In this embodiment, the discharge power of the power battery can be about 0 to 180 kW. It should be noted that the power value is affected by the battery temperature and power, and will vary for different battery packs.

[0056] In the embodiment of the present application, the execution subject of the method can be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0057] In the embodiment of the present application, the execution subject of the method can also be a smart device such as a smart phone, a tablet computer, etc., and there is no limitation on this in the present embodiment.

[0058] In this embodiment, the method is applied to the scenario where there is a heater and a charging pile that power the heater at the same time. Here, the difference in the timing of the power output between the two is explained. Because in the specific control process, the power battery acts as a voltage-stabilizing power supply, and its output power is passively output as the load is consumed. The charging pile can only output power gradually when there is load consumption (heater consumption, or charging into the battery) and the pile actively requests output power. At the same time, if the power battery has no charging capability under certain working conditions, the heater needs to be started first before the charging pile can be requested to output the corresponding power. Otherwise, if the charging pile outputs power first, it will cause the battery to overcharge.

[0059] S102, controlling the heater to perform heating operation according to the preset required gear, and ending this process.

[0060] In this embodiment, when the method detects that the maximum discharge power of the power battery is sufficient to start the heater to operate at the highest gear, the heater is controlled to operate at the heating demand gear.

[0061] In this embodiment, the required gear can be 6 gears, and the corresponding power is 9kw.

[0062] S103, determine whether the maximum discharge power is greater than the lowest working power of the heater, if yes, execute step S104; if no, end this process.

[0063] As an optional implementation, when the maximum discharge power is not greater than the lowest operating power of the heater, the heating operation is performed through the power battery relay.

[0064] In this embodiment, when the method detects that the maximum discharge power of the power battery is insufficient to start the heater, the heating function of the power battery relay is cut off.

[0065] S104, controlling the heater to perform heating operation at the lowest gear.

[0066] In this embodiment, the method can control the heater to perform heating work according to the lowest gear. Generally speaking, the lowest gear of the heater is gear 1. Therefore, in this embodiment, this step means controlling the heater to start working in gear 1.

[0067] S105: Control the charging pile to supply power to the power battery and the heater, and superimpose the power supplied by the charging pile to the heater and the lowest working power to obtain a comprehensive power supply.

[0068] In this embodiment, after the power battery supplies power to the heater, the heater can start to work. This arrangement can avoid the problem of excessive burden caused by the charging pile supplying power to the heater at the beginning.

[0069] In this embodiment, after the heater starts working, the charging pile can start charging the power battery and supply power to the heater. During the power supply process, the method can control the charging pile to charge with a small current first, and then gradually increase the current.

[0070] In this embodiment, the method can provide basic power to the heater from the power battery while the charging pile continues to provide additional power, so that the power that the heater can consume is gradually added. As the power that the heater can consume increases, it will be fed back to the charging pile, thereby alleviating the impact of the low temperature environment and further increasing the power supply (that is, the charging current request can be increased).

[0071] S106, determine whether the comprehensive power supply is greater than the middle-speed working power of the heater, if not, execute step S107; if yes, execute step S108.

[0072] In this embodiment, when the current working power of the heater is the first gear, the middle gear working power is the second gear; when the current working power of the heater is the second gear, the middle gear working power is the third gear. By analogy, it can be known that the middle gear working power is necessarily one gear higher than the current power.

[0073] In this embodiment, the highest gear, the middle gear, and the lowest gear all refer to the heating gears of the heater. Different gears correspond to different power requirements (referred to as nominal power). Specifically, for example, the first gear corresponds to 1.5kw, the second gear corresponds to 3kw, the third gear corresponds to 4.5kw, the fourth gear corresponds to 6kw, the fifth gear corresponds to 7.5kw, and the sixth gear corresponds to 9kw. In this embodiment, the number of gears and the specific corresponding relationship are not limited.

[0074] In this embodiment, when the power difference is increased, the power can be increased as long as the difference between the available power and the actual power value of the current heater is greater than 2kw.

[0075] In this embodiment, the purpose of this step is to detect that the power available to the heater by the system (the power available to the heater by the system refers to the sum of the current discharge power of the power battery to the heater and the actual output power of the charging pile to the heater) satisfies the working power of the heater (the working power is also called the nominal power) and increases by one level.

[0076] It can be understood that the discharge power mentioned in this method is only for the heater, and the power used by other electrical devices other than the heater is not taken into account (that is, the discharge power described in this application has been subtracted from the power used by other electrical devices).

[0077] S107, detecting whether the maximum discharge power is greater than the intermediate working power, if yes, executing step S108; if no, executing step S106.

[0078] In this embodiment, when the sum of the discharge power of the charging pile to the heater and the current discharge power of the power battery to the heater is insufficient to enable the heater to perform an upshift operation, step S107 is executed to detect whether the maximum discharge power of the power battery can enable the heater to perform an upshift operation.

[0079] In this embodiment, the maximum discharge power of the power battery is equal to the sum of the discharge power of the power battery to the heater and the backup discharge power of the power battery (the discharge power output of the power battery to other electrical devices is also ignored at this time).

[0080] In this embodiment, based on the understanding of the above-mentioned backup discharge power, the method can also determine whether the heater can be made to perform an upshift operation by determining whether the backup discharge power is greater than the upshift power difference.

[0081] S108, controlling the heater to perform heating operation at the middle gear.

[0082] In this embodiment, this step is used to indicate that the heater has been raised to a higher level for heating.

[0083] In this embodiment, after the heater performs an upshift operation, the power consumption of the heater will increase. As the power consumption of the heater increases, the charging request current will gradually increase so that the charging pile can supply power with a higher discharge power.

[0084] S109, when the heater is working stably, determine whether the middle gear is the preset required gear, if yes, execute step S111; if not, execute step S110.

[0085] In this embodiment, stable operation is used to indicate that the operating power of the heater is stable and remains unchanged for a period of time.

[0086] In this embodiment, this step is used to indicate that the method determines whether the heater reaches the expected gear position after the upshift, and if not, the upshift still needs to be continued.

[0087] S110, superimposing the power supplied by the charging pile to the heater and the intermediate working power to obtain a comprehensive power supply, and executing step S106.

[0088] In this embodiment, this step means that the heater does not reach the expected gear position after the gear is upgraded.

[0089] In this embodiment, the comprehensive power supply refers to the sum of the discharge power of the charging pile to the heater and the discharge power of the power battery to the heater. The superimposed power supply refers to the difference between the real-time discharge power of the charging pile to the heater and the discharge power of the charging pile used by the heater in the current gear, that is, the superimposed power supply refers to the additional power supply of the charging pile to the heater.

[0090] In this embodiment, during the charging process, if the heater does not reach the expected gear position, the method continuously detects whether the gear can be upgraded during the charging process until the gear can be upgraded.

[0091] S111, maintain the heater to perform heating operation and end this process.

[0092] In this embodiment, since the heater needs to be kept in heating operation during the charging process, when the heater reaches the required gear, the heating state is maintained until the charging is completed. Based on this charging mode, it can be ensured that the power battery can be charged more effectively in a low temperature environment.

[0093] For example, see Figure 3 , Figure 3 A heater rolling upshift coordination control method is shown, which is specifically explained as follows in conjunction with the content of this application:

[0094] The first step is to identify the available discharge power capacity of the current power battery.

[0095] In the specific implementation process, reference is made to the battery continuous discharge power capability calculated by the battery management system.

[0096] The second step is to detect that the power battery discharge power capacity is only sufficient to start the heater and maintain first gear operation.

[0097] In the specific implementation process, the specific gear at which the heater can be started is determined based on the discharge power capacity of the power battery and the nominal power of each gear of the heater.

[0098] The third step is to control the heater to start working in the first gear.

[0099] During the specific implementation process, the heater is controlled to start working in the first gear, and this part of the power consumption is first provided by the power battery.

[0100] The fourth step is to add the power consumption of the heater and gradually increase the charging request current.

[0101] During the specific implementation process, on the basis of the existing charging current request, the electric energy consumed by the heater is superimposed, and the charging request current is gradually increased. The power consumption of the heater is stable when working in a stable gear. As the current of the charging pile increases step by step, the actual output current of the power battery gradually decreases, and the electric energy consumed by the heater is gradually converted from the power battery to the charging pile.

[0102] The fifth step is to detect that the power available to the heater in the system satisfies the nominal power of the heater for the next level up.

[0103] In the specific implementation process, the power available to the heater by the system = the actual output power of the charging pile + the battery backup power - the power consumed by other modules. After the heater works in a stable gear, the output power of the charging pile gradually increases, the actual output power of the power battery gradually decreases, and the backup power of the power battery gradually increases. Therefore, the power available to the heater by the system gradually increases. When the power available to the heater by the system is sufficient to meet the nominal power consumption of the heater for one gear, the heater can be upgraded to one gear.

[0104] The sixth step is to control the heater to move up one gear.

[0105] During the specific implementation process, based on the current gear position of the heater, the heater is controlled to increase one gear, and this part of the electricity consumption is first provided by the power battery.

[0106] Step 7: superimpose the power consumption of the heater and gradually increase the charging request current.

[0107] During the specific implementation process, on the basis of the existing charging request current, the electric energy consumed by the heater is superimposed to gradually increase the charging request current. The power consumption of the heater is stable when working in a stable gear. As the current of the charging pile increases step by step, the actual output current of the power battery gradually decreases, and the electric energy consumed by the heater is gradually converted from the power battery to the charging pile.

[0108] Step 8: Detect that the current gear is working stably.

[0109] In the specific implementation process, the heater needs to continue working for a period of time (generally 10-20s) after it rises to a higher level. The power consumption of the heater varies within a certain range and is provided by the charging pile.

[0110] The ninth step is to determine whether to increase the heater gear again based on the current heater gear and the power battery heating demand gear.

[0111] In a specific implementation, when the current gear position of the heater is lower than the gear position required for heating the power battery, the fifth step is implemented; when the current gear position of the heater meets the gear position required for heating the power battery, the current heating state is maintained.

[0112] For example, see Figure 4 , Figure 4 A coordinated control method for heater power difference upshift is shown, which is specifically explained as follows in conjunction with the content of this application:

[0113] The first step is to identify the available discharge power capacity of the current power battery.

[0114] In the specific implementation process, reference is made to the battery continuous discharge power capability calculated by the battery management system.

[0115] The second step is to detect that the power battery discharge power capacity is only sufficient to start the heater and maintain first gear operation.

[0116] In the specific implementation process, the specific gear at which the heater can be started is determined based on the discharge power capacity of the power battery and the nominal power of each gear of the heater.

[0117] The third step is to control the heater to start working in the first gear.

[0118] During the specific implementation process, the heater is controlled to start working in the first gear, and this part of the power consumption is first provided by the power battery.

[0119] The fourth step is to add the power consumption of the heater and gradually increase the charging request current.

[0120] During the specific implementation process, on the basis of the existing charging current request, the electric energy consumed by the heater is superimposed, and the charging request current is gradually increased. The power consumption of the heater is stable when working in a stable gear. As the current of the charging pile increases step by step, the actual output current of the power battery gradually decreases, and the electric energy consumed by the heater is gradually converted from the power battery to the charging pile.

[0121] In the fifth step, when the power available to the heater does not meet the rolling upshift described in the previous example, but the battery backup power meets the differential upshift, the heater can be controlled to shift up one gear.

[0122] In specific implementation, the battery backup power is greater than the power difference between the heater gears, but due to factors such as the working voltage, working environment temperature, and component differences, the actual power of the heater during actual operation is lower than the nominal power of the heater at that gear, resulting in the system having the power available to the heater being less than the nominal power of the heater when it goes up one gear. At this time, the battery backup power is sufficient to cover the increase in load caused by the heater going up one gear, so the heater can be controlled to go up one gear.

[0123] The sixth step is to control the heater to move up one gear.

[0124] During the specific implementation process, based on the current gear position of the heater, the heater is controlled to move up one gear, and this part of the electricity consumption is first provided by the power battery.

[0125] Step 7: superimpose the power consumption of the heater and gradually increase the charging request current.

[0126] During the specific implementation process, on the basis of the existing charging request current, the electric energy consumed by the heater is superimposed to gradually increase the charging request current. The power consumption of the heater is stable when working in a stable gear. As the current of the charging pile increases step by step, the actual output current of the power battery gradually decreases, and the electric energy consumed by the heater is gradually converted from the power battery to the charging pile.

[0127] Step 8: Detect that the current gear is working stably.

[0128] In the specific implementation process, the heater needs to continue working for a period of time after it rises to a higher level. The power consumption of the heater varies within a certain range and is provided by the charging pile.

[0129] The ninth step is to determine whether to increase the heater gear again based on the current heater gear and the power battery heating demand gear.

[0130] In a specific implementation, when the current gear position of the heater is lower than the gear position required for heating the power battery, the fifth step is implemented to increase the heater gear position by a circular rolling method; when the current gear position of the heater meets the gear position required for heating the power battery, the current heating state is maintained.

[0131] As an optional implementation, the method further includes:

[0132] determining whether a downshift demand is detected;

[0133] When a downshift requirement is detected, a target power supply current corresponding to the current heating gear is obtained;

[0134] Control the charging pile to reduce the power supply current of the power battery and the heater to the target power supply current, and reduce the current heating gear by one gear to obtain an updated heating gear;

[0135] Determine whether the updated heating gear is zero gear;

[0136] When the heating gear is updated to zero, the heater is controlled to stop heating;

[0137] When the updated heating gear is not zero, the updated heating gear is determined as the current heating gear, and the above step of acquiring the target power supply current corresponding to the current heating gear is performed.

[0138] For example, see Figure 5 , Figure 5 A heater downshift coordination control method is shown, which is specifically explained as follows in conjunction with the content of this application:

[0139] In the first step, a downshift requirement is detected.

[0140] In a specific implementation, when the water inlet temperature of the power battery is higher than a certain target value, it is determined that the heater gear needs to be lowered.

[0141] The second step is to control and reduce the target charging current.

[0142] In a specific implementation, based on the existing charging current, the target charging current is controlled to be reduced according to the nominal power reduced by lowering the heater by one level.

[0143] In the third step, it is detected that the actual charging current is reduced to the target charging current;

[0144] In the specific implementation, since the output current fed back by the charging pile is delayed, the actual output current of the pile is calculated based on the battery current and the load current. When the actual output current of the pile is close to the target charging current, the heater downshift condition is met.

[0145] Step 4: Control the heater gear to lower one gear;

[0146] Step 5: When the heater gear is reduced to the heating target required gear, the current gear is maintained for heating; when the current gear is still higher than the required heating gear, step 1 is repeated until the heater gear reaches the target required gear;

[0147] Step 6. When the heater is completely turned off, heating is terminated.

[0148] It can be seen that the implementation of the heater control method for low-temperature charging of an electric vehicle described in this embodiment can make full use of the capabilities of the charging pile and the heater to heat the power battery, improve the heating performance of the temperature control system, and shorten the vehicle charging time; it can avoid the situation where the heater is directly started in a high gear when the heating is entered under the condition of low discharge capacity of the power battery, thereby eliminating the impact of the instantaneous power on the high-voltage system caused by this, and reducing the risk of over-discharge of the power battery; it can avoid the situation where the heater is directly turned off before the charging pile reduces the charging current when exiting the heating under the condition of low charging capacity of the power battery, thereby eliminating the phenomenon of rapid reduction in load consumption and rapid increase in battery charging current caused by this, and reducing the risk of overcharging of the power battery.

[0149] Example 2

[0150] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a heater control device for low-temperature charging of an electric vehicle provided in an embodiment of the present application. Figure 2 As shown, the heater control device for low-temperature charging of the electric vehicle includes:

[0151] An identification unit 210 is used to identify the maximum discharge power of the power battery;

[0152] The judging unit 220 is used to judge whether the maximum discharge power is greater than the highest working power of the heater; when the maximum discharge power is not greater than the highest working power, judge whether the maximum discharge power is greater than the lowest working power of the heater;

[0153] The control unit 230 is used to control the heater to perform heating operation at the lowest gear when the maximum discharge power is greater than the lowest gear working power of the heater; and control the charging pile to supply power to the power battery and the heater, and superimpose the power supplied by the charging pile to the heater and the lowest gear working power to obtain a comprehensive power supply power;

[0154] The judging unit 220 is further used to judge whether the comprehensive power supply is greater than the middle gear working power of the heater;

[0155] The control unit 230 is further used to control the heater to perform heating operation according to the intermediate gear when the comprehensive power supply is greater than the intermediate gear working power;

[0156] The judging unit 220 is further used to judge whether the middle gear is a preset required gear when the heater is working stably;

[0157] The heating unit 240 is used to maintain the heater to perform heating operation when the middle gear is the required gear.

[0158] As an optional implementation, the control unit 230 is also used to control the heater to perform heating operation according to a preset required gear when the maximum discharge power is greater than the highest working power.

[0159] As an optional implementation, the heating unit 240 is also used to perform a heating operation through the power battery relay when the maximum discharge power is not greater than the lowest operating power of the heater.

[0160] As an optional implementation, the heater control device for low-temperature charging of the electric vehicle further includes:

[0161] The detection unit 250 is used to detect whether the maximum discharge power is greater than the middle gear working power when the comprehensive power supply power is not greater than the middle gear working power; when the maximum discharge power is greater than the middle gear working power, the control unit 230 is triggered to control the heater to perform heating operation according to the middle gear.

[0162] As an optional implementation, the heater control device for low-temperature charging of the electric vehicle further includes:

[0163] The superposition unit 260 is used to superimpose the power supply of the charging pile to the heater and the intermediate gear working power to obtain a comprehensive power supply power when the intermediate gear is not the required gear, and trigger the judgment unit 220 to judge whether the comprehensive power supply power is greater than the intermediate gear working power of the heater.

[0164] As an optional implementation, the determination unit 220 is further configured to determine whether a downshift requirement is detected;

[0165] The heater control device for low-temperature charging of an electric vehicle also includes:

[0166] An acquisition unit 270, configured to acquire a target power supply current corresponding to a current heating gear when a downshift requirement is detected;

[0167] The control unit 230 is further used to control the charging pile to reduce the power supply current of the power battery and the heater to the target power supply current, and reduce the current heating gear by one gear to obtain an updated heating gear;

[0168] The judging unit 220 is further used to judge whether the updated heating gear is zero gear;

[0169] The control unit 230 is further used to control the heater to stop heating when the heating gear is updated to zero gear;

[0170] The determining unit 280 is configured to determine the updated heating gear as the current heating gear when the updated heating gear is not zero, and trigger the acquiring unit 270 to acquire the target power supply current corresponding to the current heating gear.

[0171] In the embodiments of the present application, the explanation of the heater control device for low-temperature charging of an electric vehicle can refer to the description in Embodiment 1, and no further elaboration will be given in this embodiment.

[0172] It can be seen that the implementation of the heater control device for low-temperature charging of an electric vehicle described in this embodiment can make full use of the capabilities of the charging pile and the heater to heat the power battery, improve the heating performance of the temperature control system, and shorten the vehicle charging time; it can avoid the situation where the heater is directly started in a high gear when the heating is entered under the condition of low discharge capacity of the power battery, thereby eliminating the impact of the instantaneous power on the high-voltage system caused by this, and reducing the risk of over-discharge of the power battery; it can avoid the situation where the heater is directly turned off before the charging pile reduces the charging current when exiting the heating under the condition of low charging capacity of the power battery, thereby eliminating the phenomenon of rapid reduction in load consumption and rapid increase in battery charging current caused by this, and reducing the risk of overcharging of the power battery.

[0173] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the heater control method for low-temperature charging of an electric vehicle in Embodiment 1 of the present application.

[0174] An embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the method for controlling a heater during low-temperature charging of an electric vehicle in Embodiment 1 of the present application is executed.

[0175] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0176] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0177] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0178] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0179] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0180] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for controlling a heater when charging an electric vehicle at low temperature, characterized in that: include: Identify the maximum discharge power of the power battery, and determine whether the maximum discharge power is greater than the highest working power of the heater; When the maximum discharge power is not greater than the highest-grade working power, determining whether the maximum discharge power is greater than the lowest-grade working power of the heater; When the maximum discharge power is greater than the lowest working power of the heater, the heater is controlled to perform heating operation at the lowest gear; Controlling the charging pile to supply power to the power battery and the heater, and superimposing the power supplied by the charging pile to the heater and the lowest gear working power to obtain a comprehensive power supply power; Determining whether the comprehensive power supply is greater than the middle-level working power of the heater; When the comprehensive power supply is greater than the intermediate working power, the heater is controlled to perform heating operation according to the intermediate gear; When the heater is working stably, determining whether the intermediate gear is a preset required gear; When the intermediate gear is the required gear, the heater is maintained to perform a heating operation.

2. The method for controlling a heater during low-temperature charging of an electric vehicle according to claim 1, characterized in that: The method further comprises: When the maximum discharge power is greater than the highest-level operating power, the heater is controlled to perform a heating operation according to a preset required level.

3. The method for controlling a heater during low-temperature charging of an electric vehicle according to claim 1, characterized in that: The method further comprises: When the maximum discharge power is not greater than the lowest operating power of the heater, the heating operation is performed through the power battery relay.

4. The method for controlling a heater during low-temperature charging of an electric vehicle according to claim 1, characterized in that: The method further comprises: When the comprehensive power supply power is not greater than the intermediate working power, detecting whether the maximum discharge power is greater than the intermediate working power; When the maximum discharge power is greater than the intermediate working power, the step of controlling the heater to perform a heating operation at the intermediate gear is performed.

5. The method for controlling a heater during low-temperature charging of an electric vehicle according to claim 1, characterized in that: The method further comprises: When the intermediate gear is not the required gear, the power supply of the charging pile to the heater and the intermediate gear working power are superimposed to obtain a comprehensive power supply power, and the step of determining whether the comprehensive power supply power is greater than the intermediate gear working power of the heater is performed.

6. The method for controlling a heater during low-temperature charging of an electric vehicle according to claim 1, characterized in that: The method further comprises: determining whether a downshift demand is detected; When the downshift requirement is detected, obtaining a target power supply current corresponding to the current heating gear position; Controlling the charging pile to reduce the power supply current of the power battery and the heater to the target power supply current, and reducing the current heating gear by one gear to obtain an updated heating gear; Determining whether the updated heating gear is zero; When the updated heating gear is the zero gear, controlling the heater to stop heating; When the updated heating gear is not the zero gear, the updated heating gear is determined as the current heating gear, and the step of acquiring the target power supply current corresponding to the current heating gear is performed.

7. A heater control device for low-temperature charging of an electric vehicle, characterized in that: The heater control device for low-temperature charging of an electric vehicle comprises: An identification unit, used to identify the maximum discharge power of the power battery; a judging unit, configured to judge whether the maximum discharge power is greater than the highest working power of the heater; and when the maximum discharge power is not greater than the highest working power, to judge whether the maximum discharge power is greater than the lowest working power of the heater; a control unit, configured to control the heater to perform a heating operation at the lowest gear when the maximum discharge power is greater than the lowest gear working power of the heater; and control the charging pile to supply power to the power battery and the heater, and superimpose the power supplied by the charging pile to the heater and the lowest gear working power to obtain a comprehensive power supply power; The judging unit is further used to judge whether the comprehensive power supply is greater than the middle gear working power of the heater; The control unit is further used to control the heater to perform heating operation according to the intermediate gear when the comprehensive power supply is greater than the intermediate gear working power; The judging unit is further configured to judge whether the intermediate gear is a preset required gear when the heater is working stably; The heating unit is used to maintain the heater in a heating operation when the intermediate gear is the required gear.

8. The heater control device for low-temperature charging of an electric vehicle according to claim 7, characterized in that: The control unit is further used to control the heater to perform heating operation according to a preset required gear when the maximum discharge power is greater than the highest-grade working power.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the heater control method for low-temperature charging of an electric vehicle according to any one of claims 1 to 6.

10. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the method for controlling a heater during low-temperature charging of an electric vehicle as claimed in any one of claims 1 to 6 is executed.

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