Vehicle charging control method and system and driving equipment

Abstract

The invention discloses a vehicle charging control method and system and driving equipment, and relates to the technical field of vehicle charging. The vehicle charging control method comprises the steps that the current voltage and current of the alternating current side of a vehicle-mounted charger are monitored; in response to the fact that the current voltage is smaller than the first preset voltage, target charging current of the vehicle is determined according to the current voltage, the first preset voltage and the current current. According to the vehicle charging control method, the real-time voltage and current of the alternating current side of the vehicle-mounted charger in the slow charging process of the vehicle are monitored in real time, the charging current of the vehicle is adjusted when the voltage of the alternating current side is lower than the preset voltage, the safe charging current is provided for slow charging of the vehicle, and therefore fire disasters and other safety accidents are prevented in advance.

Description

Technical Field

[0001] The present application relates to the field of vehicle charging technology, and in particular to a vehicle charging control method, system and driving device. Background Art

[0002] Electric vehicles are usually charged by slow charging. However, during the charging process, abnormal fluctuations in the power supply network, aging of the wiring harness, and improper wiring of the charging line can cause abnormal charging. If high current charging is continued under abnormal charging conditions, heat accumulation in the charging line will cause the wiring harness to burn, and even cause a fire.

[0003] The existing solution is to protect the controller and charging device by detecting and judging overvoltage, overcurrent, overload and overtemperature. Although it can prevent fires caused by charging failures during most car charging processes to a certain extent, overload, overtemperature, overvoltage, overcurrent and other failures can only be reported when the failure is about to occur or after the failure occurs, and it is impossible to prevent the occurrence of failures in advance. Summary of the invention

[0004] Purpose of the invention: The embodiments of the present application provide a vehicle charging control method, system and driving device to provide a safe charging current for slow charging of the vehicle and ensure the safety of the vehicle charging process.

[0005] Technical solution: A vehicle charging control method described in an embodiment of the present application is applied to a vehicle charger, and the method includes:

[0006] Monitoring the current voltage and current of the AC side of the on-board charger;

[0007] In response to the current voltage being less than a first preset voltage, a target charging current for the vehicle is determined according to the current voltage, the first preset voltage, and the current current.

[0008] In some embodiments, a method for determining a target charging current of a vehicle includes:

[0009] determining a first voltage difference according to the current voltage and the first preset voltage;

[0010] Determining a current current regulation ratio according to a correspondence between a preset voltage difference and a current regulation ratio and the first voltage difference;

[0011] The target charging current is determined according to the current current adjustment ratio and the current current.

[0012] In some embodiments, determining the current current regulation ratio according to the correspondence between the preset voltage difference and the current regulation ratio and the first voltage difference includes:

[0013] Based on the corresponding relationship between the preset pressure difference and the current adjustment ratio, determining a target pressure difference corresponding to the first pressure difference from a plurality of preset pressure differences;

[0014] The current regulation ratio corresponding to the target voltage difference is determined as the current current regulation ratio.

[0015] In some embodiments, the determining the target pressure difference corresponding to the first pressure difference from a plurality of preset pressure differences based on the correspondence between the preset pressure difference and the current adjustment ratio includes:

[0016] determining an alternative pressure difference greater than or equal to the first pressure difference from a plurality of the preset pressure differences;

[0017] The smallest one of the candidate pressure differences is determined as the target pressure difference corresponding to the first pressure difference.

[0018] In some embodiments, the vehicle charging control method further includes:

[0019] In response to the current voltage being less than a second preset voltage, the target charging current is controlled to be zero, wherein the first preset voltage is greater than the second preset voltage.

[0020] Accordingly, the embodiment of the present application further provides a vehicle charging control system, which is applied to a vehicle charger, and the system includes:

[0021] A monitoring module, used to monitor the current voltage and current on the AC side of the on-board charger;

[0022] A determination module is used to determine a target charging current of the vehicle according to the current voltage, the first preset voltage and the current current in response to the current voltage being less than a first preset voltage.

[0023] In some embodiments, the vehicle charging control system further includes:

[0024] The interactive module includes a charging control interface, which is arranged on the on-board charger and is used to provide a user with a charging current adjustment gear.

[0025] In some embodiments, the charging current adjustment gear includes at least one of a first adjustment gear, a second adjustment gear, a third adjustment gear, a fourth adjustment gear and a fifth adjustment gear, wherein the first adjustment gear has a first adjustment interval L1, the second adjustment gear has a second adjustment interval L2, the third adjustment gear has a third adjustment interval L3, the fourth adjustment gear has a fourth adjustment interval L4, and the fifth adjustment gear has a fifth adjustment interval L5, wherein the adjustment interval satisfies: L5 <L4<L3<L2<L1。

[0026] Correspondingly, an embodiment of the present application also provides a driving device, which includes the vehicle charging control system described above.

[0027] In some embodiments, the driving device also includes: a charging management system and CAN communication; the charging management system is electrically connected to the on-board charger and the charging control interface respectively through the CAN communication; the charging management system obtains the current charging current adjustment gear selected by the user from the charging control interface through the CAN communication, and determines the output current of the DC side of the on-board charger according to the current charging current adjustment gear.

[0028] Beneficial effects: Compared with the prior art, the vehicle charging control method, system and driving device of the embodiments of the present application include: monitoring the current voltage and current current on the AC side of the on-board charger; in response to the current voltage being less than the first preset voltage, determining the target charging current of the vehicle according to the current voltage, the first preset voltage and the current current. The vehicle charging control method provided by the present application monitors the real-time voltage and current on the AC side of the on-board charger during the slow charging process of the vehicle in real time, and adjusts the charging current of the vehicle when the voltage on the AC side is lower than the preset voltage, so as to provide a safe charging current for the slow charging of the vehicle, thereby preventing the occurrence of safety accidents such as fire in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a flow chart of a vehicle charging control method provided in an embodiment of the present application;

[0031] Figure 2 It is a principle structure block diagram of a vehicle charging control system provided in an embodiment of the present application;

[0032] Figure 3 It is a structural schematic diagram of a vehicle charging control system provided in an embodiment of the present application;

[0033] Figure 4 It is a schematic diagram of the slow charging principle structure of a driving device provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 101 - monitoring module; 102 - determination module; 100 - vehicle charging control system. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] It should be understood that although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present application. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0038] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0039] The applicant has found that there are two main types of slow charging modes for electric vehicles at home, namely: charging with an external charging pile and charging with a charging gun that comes with the vehicle. The specific implementation process of slow charging is: the AC power from the power supply network first flows into the electric vehicle through a charging pile or a charging gun in a controlled manner, and then the on-board charger on the electric vehicle converts the AC power into DC power to charge the electric vehicle battery. However, during the charging process, abnormal charging may occur due to factors such as abnormal fluctuations in the power supply network, aging of the wiring harness, and irregular wiring of the charging line. If high current charging is continued in an abnormal charging state, it will cause heat accumulation in the charging line, resulting in ablation of the wiring harness, and even cause a fire.

[0040] In order to solve similar charging safety problems, many solutions have been proposed, such as setting up a charging control system on the onboard charger of an electric vehicle, monitoring the current, voltage and temperature during the charging process in real time through the charging control system, and setting the overcurrent point and overvoltage point, and making corresponding responses according to the specific requirements of the design. For another example, an overtemperature protection is set at the charging port of the electric vehicle. When the temperature reaches above 90°, the system will control the electric vehicle to stop charging. In addition, a corresponding charging protection system is also set on the charging pile during the charging process.

[0041] However, most of these solutions are based on the protection of overvoltage, overcurrent, overload and overtemperature detection and judgment of the controller and the charging device. Although they can prevent fires caused by charging faults during most car charging processes to a certain extent, they can only report overload, overtemperature, overvoltage, overcurrent and other faults when the fault is about to occur or after the fault occurs (for example, due to overload, overtemperature, overvoltage, overcurrent and other possible ignition points have been ignited, and the fire has already occurred), and it is impossible to prevent the occurrence of faults in advance.

[0042] In view of this, the embodiments of the present application provide a vehicle charging control method, system and driving device. The present application monitors the real-time voltage and current on the AC side of the on-board charger during the vehicle slow charging process, and adjusts the vehicle's charging current when the voltage on the AC side is lower than a preset voltage, so as to provide a safe charging current for the vehicle slow charging, thereby preventing the occurrence of safety accidents such as fire in advance.

[0043] Figure 1 This is a flow chart of a vehicle charging control method provided in an embodiment of the present application. This method can be applied to a vehicle management platform to implement vehicle charging safety protection during home slow charging. This method can be executed by a vehicle charging control system, which can be implemented by software and / or hardware, and can be configured in a processor or controller of a vehicle management platform. Figure 1 , the method comprises the following steps:

[0044] Step 110: Monitor the current voltage and current on the AC side of the on-board charger.

[0045] The on-board charger includes an AC side and a DC side, wherein the AC side is electrically connected to the power supply end (such as a 220V AC grid), and the DC side is electrically connected to the vehicle (such as a vehicle battery pack). The on-board charger is used to convert the AC power input from the power supply end into DC power output for charging the vehicle.

[0046] Among them, during the slow charging process at home, due to factors such as irregular charging (for example, the charging line is set relatively long, the wire diameter of the charging wire is selected relatively large, the crimping effect between the wires is not good, etc.), the line loss is relatively large, so the charging voltage obtained by the vehicle is relatively small, and the charging power of the vehicle is usually certain, so it is easy to cause safety accidents such as line heating and line fire during the slow charging process of the vehicle. For this reason, it is necessary to monitor the voltage and current on the AC side of the on-board charger in real time, so as to adjust the charging current of the vehicle in real time, so as to provide a safe charging current for the slow charging of the vehicle, thereby preventing the occurrence of safety accidents such as fire in advance, and then ensuring the safety of the vehicle during the slow charging process.

[0047] Among them, the current voltage on the AC side of the on-board charger can be monitored and obtained through voltage monitoring devices such as voltage transformers. Similarly, the current current on the AC side of the on-board charger can be monitored and obtained through current monitoring devices such as current transformers.

[0048] Step 120: In response to the current voltage being less than the first preset voltage, a target charging current for the vehicle is determined according to the current voltage, the first preset voltage, and the current current.

[0049] Exemplarily, the first preset voltage is a value such as 190V, which can be set according to actual conditions and is not specifically limited here.

[0050] Specifically, the current voltage and current of the AC side of the on-board charger are monitored and obtained in real time. It is determined whether the current voltage is less than the first preset voltage. If the current voltage is less than the first preset voltage, the charging current of the vehicle is adjusted in real time according to the current voltage, the first preset voltage and the current current to adjust the charging power of the vehicle, reduce the heat loss generated in the AC charging circuit, and avoid the risk of burning of the charging circuit due to the accumulation of heat, and even ignition of fire, so as to ensure the safety of the vehicle during the slow charging process. For example, due to factors such as irregular charging during the home slow charging process, the line loss is relatively large, so that the voltage transmitted from the AC power grid to the AC side of the on-board charger often becomes smaller, causing safety problems in the slow charging process of the vehicle. For example, assuming that the first preset voltage is 190V, the voltage output by the AC power grid is 220V, and the voltage transmitted from the AC power grid to the AC side of the on-board charger is only 180V. At this time, the target charging current of the vehicle is adjusted in real time according to the current voltage, the first preset voltage and the current current to adjust the charging power of the vehicle, reduce the heat loss generated in the AC charging circuit, and ensure the safety of the slow charging process.

[0051] In some embodiments, the method for determining the target charging current of a vehicle specifically includes the following steps:

[0052] Step 1: determining a first voltage difference according to a current voltage and a first preset voltage.

[0053] Specifically, the current voltage on the AC side of the on-board charger is obtained, and a first voltage difference is obtained based on the difference between the current voltage and the first preset voltage, so that the adjustment ratio of the charging current can be subsequently determined based on the first voltage difference. This is beneficial to adjusting the charging current during the slow charging process of the vehicle, reducing the heat loss of the AC charging circuit, and ensuring safe charging of the vehicle.

[0054] Step 2: Determine the current current regulation ratio according to the corresponding relationship between the preset voltage difference and the current regulation ratio and the first voltage difference.

[0055] Among them, the correspondence between the preset voltage difference and the current regulation ratio can be determined by generally querying the correspondence table between the voltage difference and the current regulation ratio. For example, assuming that the voltage difference is less than 30V, the corresponding current regulation ratio is 20%. The voltage difference is greater than 30V and less than 60V, and the corresponding current regulation ratio is 40%. The voltage difference is greater than 60V and less than 90V, and the corresponding current regulation ratio is 60%. The voltage difference is greater than 90V and less than 120V, and the corresponding current regulation ratio is 80%.

[0056] Specifically, the current voltage on the AC side of the on-board charger is obtained, and a first voltage difference is obtained according to the difference between the current voltage and the first preset voltage. Then, the current current adjustment ratio can be determined according to the first voltage difference and the corresponding relationship between the preset voltage difference and the current adjustment ratio, so that the charging current of the vehicle can be determined according to the current adjustment ratio in the future, which is conducive to adjusting the charging current of the vehicle during the slow charging process, reducing the heat loss of the AC charging circuit, thereby preventing the occurrence of safety accidents such as fire in advance, and ensuring the safety of the vehicle during the slow charging process.

[0057] In some embodiments, the current current regulation ratio is determined based on the correspondence between the preset pressure difference and the current regulation ratio and the first pressure difference, including: based on the correspondence between the preset pressure difference and the current regulation ratio, determining a target pressure difference corresponding to the first pressure difference from multiple preset pressure differences; and determining the current regulation ratio corresponding to the target pressure difference as the current current regulation ratio.

[0058] Exemplarily, the multiple preset voltage differences include 30V, 60V, 90V and 120V, etc., which can be set according to actual conditions and are not specifically limited here.

[0059] For example, the current adjustment ratio corresponding to each 30V decrease in the preset voltage difference is reduced by 20%. The corresponding relationship between the preset voltage difference and the current adjustment ratio includes: the voltage difference is less than 30V, and the corresponding current adjustment ratio is 20%. The voltage difference is greater than 30V and less than 60V, and the corresponding current adjustment ratio is 40%. The voltage difference is greater than 60V and less than 90V, and the corresponding current adjustment ratio is 60%. The voltage difference is greater than 90V and less than 120V, and the corresponding current adjustment ratio is 80%.

[0060] It should be noted that the reason for reducing the power for each voltage drop caused by wiring harness loss (i.e., adjusting the corresponding current condition ratio to reduce the charging power for each voltage drop caused by wiring harness loss) is as follows: For example, the power reduction for each 30V voltage drop caused by wiring harness loss is used as an example. For example, assuming that the rated power of electric vehicle home charging is 7kw, the input current on the AC side of the on-board charger is 32A, the input voltage is 220V, and the wire diameter is 6mm 2. If the input voltage of the on-board charger AC side is 190V due to the wiring harness problem, that is, 30V is lost in the wiring harness, then the corresponding power loss P=UI=32*30=960W, and this part of the loss is conducted to the wiring harness in the form of heat. For example, based on the 8-hour home charging of a pure electric vehicle, according to the Joule heat Q=PT=960w*8h=27648kJ, for a wire diameter of 6mm 2 For wiring harnesses, these heat losses cannot be ignored (normal temperature 25° and above).

[0061] Among them, based on the correspondence between the preset voltage difference and the current regulation ratio, the target voltage difference corresponding to the first voltage difference is determined from multiple preset voltage differences; the current regulation ratio corresponding to the target voltage difference is determined as the current current regulation ratio, which means: for example, assuming that the current voltage is 180V and the first preset voltage is 190V, then the first voltage difference is 10V according to the current voltage and the first preset voltage. According to the first voltage difference 10V, the target voltage difference of the first voltage difference 10V is determined from multiple preset voltage differences 30V, 60V, 90V and 120V, and then according to the determined target voltage difference, based on the correspondence between the preset voltage difference and the current regulation ratio, the current regulation ratio corresponding to the target voltage difference can be obtained, and the current regulation ratio is used as the current current regulation ratio. For example, assuming that the target voltage difference corresponding to the first voltage difference of 10V is 30V, then based on the target voltage difference of 30V and the correspondence between the preset voltage difference and the current regulation ratio (that is, the voltage difference is less than 30V, and the corresponding current regulation ratio is 20%), it can be obtained that the current regulation ratio corresponding to the target voltage difference of 30V is 20%, and the current regulation ratio of 20% is used as the current current regulation ratio.

[0062] Specifically, the current voltage on the AC side of the on-board charger is obtained, and a first voltage difference is obtained based on the difference between the current voltage and the first preset voltage. Then, based on the correspondence between the preset voltage difference and the current regulation ratio, a target voltage difference corresponding to the first voltage difference is determined from multiple preset voltage differences; and the current regulation ratio corresponding to the target voltage difference is determined as the current current regulation ratio. Thus, by monitoring the current voltage on the AC side of the on-board charger, and according to the correspondence between the current voltage, the preset voltage difference and the current regulation ratio, the current current regulation ratio can be obtained, so that the charging current of the vehicle can be adjusted in real time according to the current current regulation ratio, which is beneficial to reduce the heat loss in the AC charging circuit, thereby preventing the occurrence of safety accidents such as fire in advance and ensuring the safety of the vehicle during slow charging.

[0063] In some embodiments, based on the correspondence between the preset pressure difference and the current regulation ratio, a target pressure difference corresponding to the first pressure difference is determined from multiple preset pressure differences, including: determining an alternative pressure difference greater than or equal to the first pressure difference from multiple preset pressure differences; and determining the smallest one of the alternative pressure differences as the target pressure difference corresponding to the first pressure difference.

[0064] Among them, determining an alternative pressure difference greater than or equal to the first pressure difference from multiple preset pressure differences, and determining the smallest one of the alternative pressure differences as the target pressure difference corresponding to the first pressure difference means: for example, assuming that the current voltage is 140V and the first preset voltage is 190V, then the first pressure difference can be calculated to be 50V according to the current voltage and the first preset voltage. Since multiple preset pressure differences are 30V, 60V, 90V and 120V, the preset pressure differences 60V, 90V and 120V greater than the first pressure difference 50V are used as alternative pressure differences, and the smallest one (i.e. 60V) among the alternative pressure differences 60V, 90V and 120V is used as the target pressure difference.

[0065] Specifically, the current voltage on the AC side of the on-board charger is obtained, and the first voltage difference is obtained according to the difference between the current voltage and the first preset voltage. Then, based on the correspondence between the preset voltage difference and the current adjustment ratio, an alternative voltage difference greater than or equal to the first voltage difference is determined from multiple preset voltage differences; the smallest one of the alternative voltage differences is determined as the target voltage difference corresponding to the first voltage difference. The current adjustment ratio corresponding to the target voltage difference is determined as the current current adjustment ratio. For example, assuming that the current voltage is 140V and the first preset voltage is 190V, the first voltage difference can be calculated to be 50V based on the current voltage and the first preset voltage. Since multiple preset voltage differences are 30V, 60V, 90V and 120V, the preset voltage differences of 60V, 90V and 120V greater than the first voltage difference of 50V are used as alternative voltage differences, and the smallest one of the alternative voltage differences 60V, 90V and 120V (i.e., 60V) is used as the target voltage difference. Then, according to the target voltage difference of 50V, and the corresponding relationship between the preset voltage difference and the current regulation ratio (that is, the voltage difference is greater than 30V and less than 60V, and the corresponding current regulation ratio is 40%), it can be obtained that the current regulation ratio corresponding to the target voltage difference of 50V is 40%. Finally, the current regulation ratio of 40% is used as the current current regulation ratio. Thus, by monitoring the current voltage on the AC side of the on-board charger, and according to the corresponding relationship between the current voltage, the preset voltage difference and the current regulation ratio, the current current regulation ratio can be obtained, so that the charging current of the vehicle can be adjusted in real time according to the current current regulation ratio, which is conducive to reducing the heat loss in the AC charging circuit, thereby preventing the occurrence of safety accidents such as fire in advance, and ensuring the safety of the vehicle during slow charging.

[0066] Step 3: Determine the target charging current according to the current current adjustment ratio and the current current.

[0067] Among them, the specific implementation method for determining the target charging current according to the current current adjustment ratio and the current current includes: obtaining the target charging current according to the product of the current current adjustment ratio and the current current. For example, assuming that the first preset voltage is 190V, when the current voltage is between 190V-160V, the corresponding target charging current is equal to the current current multiplied by 0.8. When the current voltage is between 160V-130V, the corresponding target charging current is equal to the current current multiplied by 0.6. When the current voltage is between 130V-100V, the corresponding target charging current is equal to the current current multiplied by 0.4. When the current voltage is between 100V-85V, the corresponding target charging current is equal to the current current multiplied by 0.2. Therefore, by monitoring the current voltage and current on the AC side of the on-board charger in real time, and when it is detected that the current voltage is lower than the first preset voltage, an alarm is sent to the system, and the target charging current of the vehicle is adjusted according to the current voltage, the first preset voltage and the current current, so as to reduce the charging current and the charging power, so as to reduce the heat loss generated in the AC charging circuit, thereby avoiding the risk of fire caused by power supply line burning or even ignition due to heat accumulation, thereby ensuring that the vehicle can be charged while achieving safe charging.

[0068] It can be understood that the vehicle charging control method provided in the present application monitors the real-time voltage and current on the AC side of the on-board charger during the vehicle slow charging process, and adjusts the vehicle's charging current when the voltage on the AC side is lower than a preset voltage, so as to provide a safe charging current for the vehicle slow charging, thereby preventing the occurrence of safety accidents such as fire in advance.

[0069] In some embodiments, the vehicle charging control method further includes: in response to the current voltage being less than a second preset voltage, controlling the target charging current to be zero, wherein the first preset voltage is greater than the second preset voltage.

[0070] Exemplarily, the second preset voltage is a value such as 85V, which can be set according to actual conditions and is not specifically limited here.

[0071] Specifically, the current voltage and current of the AC side of the on-board charger are monitored and obtained in real time. If the current voltage is less than the second preset voltage, the target charging current is controlled to zero, charging is turned off, and an AC side undervoltage fault is reported. In this way, the abnormal change trend during the charging process can be identified and processed, ensuring that the vehicle can be charged while achieving safe charging.

[0072] Figure 2 This is a schematic diagram of the principle structure of a vehicle charging control system provided in the embodiment of the present application. Correspondingly, the embodiment of the present application also provides a vehicle charging control system, please refer to Figure 2The vehicle charging control system 100 is applied to a vehicle-mounted charger, and the vehicle charging control system 100 includes: a monitoring module 101, which is used to monitor the current voltage and current current of the AC side of the vehicle-mounted charger; a determination module 102, which is used to determine the target charging current of the vehicle according to the current voltage, the first preset voltage and the current current in response to the current voltage being less than the first preset voltage.

[0073] In the technical solution of the embodiment of the present application, a vehicle charging control system is provided, which includes: a monitoring module for monitoring the current voltage and current current on the AC side of the on-board charger; a determination module for determining the target charging current of the vehicle according to the current voltage, the first preset voltage and the current current in response to the current voltage being less than the first preset voltage. The vehicle charging control system provided by the present application monitors the real-time voltage and current on the AC side of the on-board charger during the vehicle slow charging process in real time, and adjusts the charging current of the vehicle when the voltage on the AC side is lower than the preset voltage, so as to provide a safe charging current for the vehicle slow charging, thereby preventing the occurrence of safety accidents such as fire in advance.

[0074] Figure 3 1 is a schematic diagram of a vehicle charging control system provided in an embodiment of the present application. In some embodiments, the vehicle charging control system further includes: an interaction module, the interaction module includes a charging control interface, and the charging control interface is provided on the on-board charger to provide the user with a charging current adjustment gear.

[0075] Among them, the charging control interface provides multiple buttons for actively reducing the charging power. For example, when the user actively determines that the current charging environment is relatively safe, full power charging (32A) can be selected. When the current charging environment is determined to be risky (such as the power distribution cabinet is far away, the wiring is not standardized, etc.), the user can choose 16A, 10A, 8A or 6A to charge according to the situation. This increases the user's controllability over risky charging situations.

[0076] Among them, the charging control interface is as follows Figure 3 As shown, it includes multiple soft switches such as charging current adjustment gears, charging start time, charging end time, scheduled charging, and charging current settings. Among them, the charging current adjustment gear is used to provide charging users with multiple optional charging currents.

[0077] In some embodiments, the charging current adjustment gear includes at least one of a first adjustment gear, a second adjustment gear, a third adjustment gear, a fourth adjustment gear and a fifth adjustment gear, wherein the first adjustment gear has a first adjustment interval L1, the second adjustment gear has a second adjustment interval L2, the third adjustment gear has a third adjustment interval L3, the fourth adjustment gear has a fourth adjustment interval L4, and the fifth adjustment gear has a fifth adjustment interval L5, wherein the adjustment interval satisfies: L5 <L4<L3<L2<L1。

[0078] Exemplarily, the first adjustment interval L1 is 32A, the second adjustment interval L2 is 16A, the third adjustment interval L3 is 10A, the fourth adjustment interval L4 is 8A, and the fifth adjustment interval L5 is 6A.

[0079] The charging control interface is the central control operation panel. Multiple central control screen soft switches are set in the central control operation panel. For example, refer to Figure 3 , set a column of charging current settings in the charging menu bar, and set five charging current adjustment gears of 32A, 16A, 10A, 8A and 6A for charging, so that users can click the soft switch on the large screen to select the appropriate charging current according to the corresponding charging environment.

[0080] In some embodiments, the determination module 102 is also used to: determine a first voltage difference based on the current voltage and the first preset voltage; determine a current current regulation ratio based on a correspondence between the preset voltage difference and the current regulation ratio and the first voltage difference; determine the target charging current based on the current current regulation ratio and the current current.

[0081] In some embodiments, the determination module 102 is further used to: determine a target pressure difference corresponding to the first pressure difference from multiple preset pressure differences based on the correspondence between the preset pressure difference and the current regulation ratio; and determine the current regulation ratio corresponding to the target pressure difference as the current current regulation ratio.

[0082] In some embodiments, the determination module 102 is further configured to: determine an alternative pressure difference greater than or equal to the first pressure difference from a plurality of the preset pressure differences; and determine the smallest one of the alternative pressure differences as the target pressure difference corresponding to the first pressure difference.

[0083] In some embodiments, the determination module 102 is further configured to: in response to the current voltage being less than a second preset voltage, control the target charging current to be zero, wherein the first preset voltage is greater than the second preset voltage.

[0084] Correspondingly, an embodiment of the present application also provides a driving device, which includes the vehicle charging control system described in any embodiment of the present application.

[0085] Among them, driving equipment includes pure electric vehicles, hybrid vehicles, etc., which can be set according to actual conditions and are not specifically limited here.

[0086] Figure 4 It is a schematic diagram of the slow charging principle structure of a driving device provided in an embodiment of the present application. In some embodiments, the driving device also includes: a charging management system, namely a battery management system (BMS), and CAN communication. The charging management system is electrically connected to the on-board charger and the charging control interface respectively through CAN communication; the charging management system obtains the current charging current adjustment gear selected by the user from the charging control interface through CAN communication, and determines the output current of the DC side of the on-board charger according to the current charging current adjustment gear.

[0087] For example, see Figure 4 , the driving device includes an intelligent cockpit, a vehicle charging plug, a BMS, a power battery pack and an on-board charger (OBC). Among them, the intelligent cockpit includes an intelligent cockpit system and a multimedia display screen. The vehicle charging plug includes a charging port. The on-board charger includes a DC / AC inverter module, a current and voltage monitoring module and an OBC input current detection. Among them, the intelligent cockpit system is connected to the BMS through CAN communication, and the BMS is connected to the on-board charger through CAN communication. Among them, one end of the DC / AC inverter module is connected to the 220V AC mains by connecting to the charging port, and the current and voltage monitoring module is installed between the DC / AC inverter module and the charging port to monitor the current voltage and current current on the AC side. Among them, the power battery pack is electrically connected to the other end of the DC / AC inverter module, and the OBC input current detection is set between the DC / AC inverter module and the power battery pack to detect the current input to the power battery pack.

[0088] For example, the user enters Figure 3 Select the required charging current from the five charging current adjustment gears of 32A, 16A, 10A, 8A and 6A shown for current charging. The cockpit system receives the large screen soft switch signal (that is, receives the charging current adjustment gear signal selected by the user), and reports the charging current adjustment gear selected by the user to the CAN bus through CAN communication interaction. After the BMS receives the CAN bus signal and calculates it, it directly sends the corresponding charging current instruction to the on-board charger. The on-board charger receives the charging current instruction through CAN communication interaction and adjusts the output charging current. In this way, the user can subjectively judge the safety of the current charging environment and choose whether to charge at reduced power or at full power, which increases the user's controllability over risky charging situations, thereby ensuring the safety of the vehicle during slow charging.

[0089] It can be seen that, on the one hand, the present application can realize the voltage and current monitoring of the vehicle during the slow charging process and the automatic regulation of the charging current by providing a vehicle charging control method, so as to automatically identify the abnormal change trend during the vehicle charging process, thereby ensuring the safety of the charging process. On the other hand, by providing a charging control interface and multiple charging current adjustment gears, it is convenient for users to select the corresponding charging current gear according to the actual charging environment, so as to increase the user's controllability of risky charging situations, thereby further ensuring the safety of the vehicle during the slow charging process. In this way, while providing double protection, the flexibility and applicability of vehicle charging safety protection can be improved.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] The vehicle charging control method, system and driving device provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle charging control method, characterized in that: Applied to a vehicle charger, the method comprises: Monitoring the current voltage and current of the AC side of the on-board charger; In response to the current voltage being less than a first preset voltage, a target charging current for the vehicle is determined according to the current voltage, the first preset voltage, and the current current.

2. The vehicle charging control method according to claim 1, characterized in that: The method for determining the target charging current of the vehicle comprises: determining a first voltage difference according to the current voltage and the first preset voltage; Determining a current current regulation ratio according to a correspondence between a preset voltage difference and a current regulation ratio and the first voltage difference; The target charging current is determined according to the current current adjustment ratio and the current current.

3. The vehicle charging control method according to claim 2, characterized in that: The determining the current current regulation ratio according to the correspondence between the preset voltage difference and the current regulation ratio and the first voltage difference includes: Based on the corresponding relationship between the preset pressure difference and the current adjustment ratio, determining a target pressure difference corresponding to the first pressure difference from a plurality of preset pressure differences; The current regulation ratio corresponding to the target voltage difference is determined as the current current regulation ratio.

4. The vehicle charging control method according to claim 3, characterized in that: The determining, based on the correspondence between the preset pressure difference and the current adjustment ratio, a target pressure difference corresponding to the first pressure difference from a plurality of preset pressure differences comprises: determining an alternative pressure difference greater than or equal to the first pressure difference from a plurality of the preset pressure differences; The smallest one of the alternative pressure differences is determined as the target pressure difference corresponding to the first pressure difference.

5. The vehicle charging control method according to claim 1, characterized in that: Also includes: In response to the current voltage being less than a second preset voltage, the target charging current is controlled to be zero, wherein the first preset voltage is greater than the second preset voltage.

6. A vehicle charging control system, characterized in that: Applied to a vehicle charger, the system comprises: A monitoring module, used to monitor the current voltage and current on the AC side of the on-board charger; A determination module is used to determine a target charging current of the vehicle according to the current voltage, the first preset voltage and the current current in response to the current voltage being less than a first preset voltage.

7. The vehicle charging control system according to claim 6, characterized in that: Also includes: The interactive module includes a charging control interface, which is arranged on the on-board charger and is used to provide a user with a charging current adjustment gear.

8. The vehicle charging control system according to claim 7, characterized in that: The charging current adjustment gear comprises at least one of a first adjustment gear, a second adjustment gear, a third adjustment gear, a fourth adjustment gear and a fifth adjustment gear, wherein the first adjustment gear has a first adjustment interval L1, the second adjustment gear has a second adjustment interval L2, the third adjustment gear has a third adjustment interval L3, the fourth adjustment gear has a fourth adjustment interval L4, and the fifth adjustment gear has a fifth adjustment interval L5, wherein the adjustment interval satisfies: L5 <L4<L3<L2<L1。 9. A driving device, characterized in that: It comprises a vehicle charging control system as claimed in any one of claims 6 to 8.

10. The driving device according to claim 9, characterized in that: Also includes: Charging management system and CAN communication; The charging management system is electrically connected to the on-board charger and the charging control interface respectively through the CAN communication; The charging management system obtains the current charging current adjustment gear selected by the user from the charging control interface through the CAN communication, and determines the output current of the DC side of the on-board charger according to the current charging current adjustment gear.

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