Charging control method, system, device and computer storage medium

Abstract

The application discloses a charging control method, system, device and computer storage medium, relates to the technical field of charging control, and is applied to a charging control system. The charging control system is connected with a vehicle battery and a charging pile respectively. The charging control system comprises a nine-phase driving bridge arm and nine coil windings. The nine-phase driving bridge arm is connected with the vehicle battery and a first end of the coil windings. A second end of the coil windings is connected with the charging pile after being connected in common. The first charging voltage of the vehicle battery and the second charging voltage of the charging pile are acquired, and the voltage difference between the first charging voltage and the second charging voltage is determined. The charging use winding information is determined in the coil windings according to the voltage difference, and the nine-phase driving bridge arm is driven and controlled according to the charging use winding information, so that the charging of the vehicle battery is realized. The application realizes the charging control without a DC-DC step-up converter.

Description

Technical Field

[0001] This application relates to the field of charging control technology, and in particular to a charging control method, system, device and computer storage medium. Background Technology

[0002] As the demand for charging control in various applications of vehicles continues to evolve, users are placing higher demands on charging control methods.

[0003] Traditional charging control methods use a DC-DC boost converter to boost the voltage of the low-voltage charging station before charging the high-voltage vehicle battery. For example, the 400V charging station voltage is boosted to the required 800V for the vehicle battery using a DC-DC boost converter. This method has limitations, as it necessitates the use of a DC-DC boost converter. Therefore, a new charging control method is urgently needed that can achieve charging control without requiring a DC-DC boost converter.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide a charging control method, system, device, and computer storage medium, aiming to solve the technical problem of how to achieve charging control without the need for a DC-DC boost converter.

[0006] To achieve the above objectives, this application provides a charging control method applied to a charging control system. The charging control system is connected to a vehicle battery and a charging pile. The charging control system includes a nine-phase drive arm and nine coil windings. The nine-phase drive arm is connected to the vehicle battery and a first end of each coil winding. The second end of each coil winding is connected to the charging pile. The charging control method includes: Obtain the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determine the voltage difference between the first charging voltage and the second charging voltage; Based on the voltage difference, the charging winding information is determined in the coil winding, and the nine-phase drive bridge arm is driven and controlled according to the charging winding information to achieve charging of the vehicle battery.

[0007] In one embodiment, the step of determining charging winding information based on the voltage difference in the coil winding includes: When the voltage difference is less than the first voltage threshold, three coil windings in the coil windings are identified as charging windings. When the voltage difference is less than the second voltage threshold and the voltage difference is greater than or equal to the first voltage threshold, six coil windings in the coil windings are identified as charging windings, wherein the second voltage threshold is greater than the first voltage threshold. When the voltage difference is greater than or equal to the second voltage threshold, all coil windings are identified as windings used for charging.

[0008] In one embodiment, the charging control system further includes a parameter acquisition module for the coil winding. After the step of determining the charging winding information based on the voltage difference in the coil winding, the system includes: The charging parameter data of the coil winding collected by the parameter acquisition module is obtained, and the target number of coil windings for charging is determined. For each coil winding, the usage priority of the coil winding is determined in a preset parameter application table based on the charging parameter data, and the charging winding information is updated according to the usage priority of the coil winding and the target number of coil windings.

[0009] In one embodiment, the step of driving the nine-phase drive bridge arm according to the charging winding information includes: The target coil winding in the charging winding information is determined, and the target drive arm of the target coil winding in the nine-phase drive arm is determined. The target drive arm is driven and controlled according to a preset start-up drive mode.

[0010] In one embodiment, the charging control system further includes a positive switch and a negative switch that directly connect the vehicle battery and the charging pile, and a boost switch that directly connects the second end of the coil winding and the charging pile. After the step of determining the voltage difference between the first charging voltage and the second charging voltage, the system includes: When the voltage difference is less than a preset boost threshold, a direct charging control command is generated, wherein the direct charging control command is used to control both the positive and negative switch tubes to be turned on, so that the charging pile directly charges the vehicle battery; When the voltage difference is greater than or equal to a preset boost threshold, a boost control command is generated, and the step of determining the charging winding information in the coil winding based on the voltage difference is executed. The boost control command is used to control both the boost switch and the negative switch to be turned on, so that the voltage of the charging pile is boosted to charge the vehicle battery.

[0011] Furthermore, to achieve the above objectives, this application also provides a charging control system, which is connected to a vehicle battery and a charging pile respectively. The charging control system includes a drive controller, a nine-phase drive axle arm, and nine coil windings. The nine-phase drive axle arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. The drive controller is connected to the nine-phase drive axle arm, the vehicle battery, and the charging pile. The drive controller includes: The data acquisition module is used to acquire the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and to determine the voltage difference between the first charging voltage and the second charging voltage. The charging control module is used to determine the charging winding information in the coil winding based on the voltage difference, and to drive the nine-phase drive bridge arm according to the charging winding information to realize the charging of the vehicle battery.

[0012] In one embodiment, the nine-phase drive axle arm includes three sets of three-phase drive axle arms. The positive terminals of each set of three-phase drive axle arms are connected together and then connected to the positive terminal of the vehicle battery. The negative terminals of each set of three-phase drive axle arms are connected together and then connected to the negative terminal of the vehicle battery. The control terminal of the three-phase drive axle arm is connected to the drive controller. The output terminal of one three-phase drive axle arm is connected to the first terminal of each of the three coil windings. The three-phase drive bridge arm includes three drive bridge arms. The positive terminals of each drive bridge arm are connected together to form the positive terminal of the three-phase drive bridge arm, and the negative terminals of each drive bridge arm are connected together to form the negative terminal of the three-phase drive bridge arm. The control terminal of each drive bridge arm is connected to the drive controller, and the output terminal of each drive bridge arm is connected to the first terminal of a coil winding. Each drive bridge arm includes: An upper bridge switch transistor, wherein the first end of the upper bridge switch transistor serves as the positive terminal of the drive bridge arm, and the second end of the upper bridge switch transistor serves as the control terminal of the drive bridge arm; The lower bridge switch tube has its first end connected to the third end of the upper bridge switch tube and then connected to the first end of the coil winding. The second end of the lower bridge switch tube serves as the control end of the drive bridge arm, and the third end of the lower bridge switch tube serves as the negative terminal of the drive bridge arm.

[0013] In one embodiment, the charging control system further includes: A positive switch transistor, wherein the first end of the positive switch transistor is connected to the positive terminal of the vehicle battery, and the second end of the positive switch transistor is connected to the drive controller; A negative terminal switch is provided, with its first end connected to the negative terminal of the vehicle battery, its second end connected to the drive controller, and its third end connected to the negative terminal of the charging pile. A boost switch transistor is provided, with its first end connected to the third end of the positive switch transistor, its second end connected to the drive controller, and its third end connected to the positive terminal of the charging pile.

[0014] In addition, to achieve the above objectives, this application also provides a charging control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the charging control method described above.

[0015] In addition, to achieve the above objectives, this application also provides a computer storage medium storing a charging control program, wherein when the charging control program is executed by a processor, it implements the steps of the charging control method described above.

[0016] This application provides a charging control method applied to a charging control system. The charging control system is connected to a vehicle battery and a charging pile. The charging control system includes a nine-phase drive bridge arm and nine coil windings. The nine-phase drive bridge arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. The method obtains the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determines the voltage difference between the first and second charging voltages. Based on the voltage difference, the method determines the charging winding information in the coil windings, and drives the nine-phase drive bridge arm according to the charging winding information to achieve charging of the vehicle battery. This charging control method determines the voltage difference between the vehicle battery and the charging station, then uses this voltage difference to determine the charging winding information in the coil windings. Finally, combined with the design of a nine-phase drive bridge arm and nine coil windings, the nine-phase drive bridge arm is driven and controlled according to the charging winding information. In other words, the entire charging control process uses a design of a nine-phase drive bridge arm and nine coil windings, and is controlled in conjunction with the voltage difference between the vehicle battery and the charging station. This allows for charging control through a new charging method without the need for a DC-DC boost converter. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of the first embodiment of the charging control method of this application; Figure 2 A schematic diagram of a common boost control method for charging control; Figure 3 This is a schematic diagram of the circuit design in the charging control method of this application; Figure 4 This is a schematic diagram of the drive controller module of this application; Figure 5 This is a schematic diagram of the charging control device in this application.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0019] Explanation of icon numbers: 1001. Processing device; 1002. Read-only memory; 1003. Storage device; 1004. Random access memory; 1005. Bus; 1006. Input / output interface; 1007. Input device; 1008. Output device; 1009. Communication device; B. Vehicle battery; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; K1. First switch; K2. Second switch; DC. Charging pile; Q1. First switch transistor; Q2. Second switch transistor; Q3. Third switch transistor; Q4. Fourth switch transistor; Q5. Fifth switch transistor; Q6. Sixth switch transistor; Q7. Seventh switch transistor; Q8. Eighth switch transistor; Q9. Ninth switch transistor; Q10. Tenth switch transistor; Q11. 11. Switching transistor; Q12, 12th; Q13, 13th; Q14, 14th; Q15, 15th; Q16, 16th; Q17, 17th; Q18, 18th; Q19, positive switch; Q20, negative switch; Q21, boost switch; L1, first coil winding; L2, second coil winding; L3, third coil winding; L4, fourth coil winding; L5, fifth coil winding; L6, sixth coil winding; L7, seventh coil winding; L8, eighth coil winding; L9, ninth coil winding; R1, first resistor; R2, second resistor; K3, main positive relay; K4, precharge relay; K5, main negative relay. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Regarding the charging issue of vehicle batteries (especially when the charging station voltage is lower than the vehicle battery voltage), the following solutions generally exist. The first is to use an onboard DC-DC boost converter, i.e., to install an additional high-power (e.g., 150kW or higher) DC-DC boost converter inside the vehicle to boost the 400V DC power from the charging station to above 800V before charging the battery. However, this solution has fatal drawbacks such as extremely high cost, large size and weight, complex system, and significant losses, which contradicts the extreme pursuit of cost control and space utilization in electric vehicles. The second approach is to wait for the charging infrastructure to boost the voltage, i.e., wait for 800V charging stations to become available. The third approach is to use the motor drive windings to boost the voltage; for example, refer to... Figure 2 , Figure 2 This diagram illustrates a common boost control method for charging. While boosting the voltage using the motor's coil windings L1-L3 presents challenges such as high-frequency heating of the windings, accelerated insulation aging, and reduced motor system lifespan. Even with existing 800V charging stations, the existing electric drive boost system circuitry must still be utilized, preventing the disconnection of the motor controller's rectifier circuit. This significantly increases the stress on the motor controller's IGBT (Insulated Gate Bipolar Transistor), impacting the electric drive system's lifespan. Furthermore, the motor's inductance in the boost circuit is fixed, making it impossible to adjust the three-phase inductance. Wide-range charging boost and higher power boost can only be achieved by adjusting the IGBT's frequency and duty cycle. Another issue is that during charging of the three-phase single-winding circuit, a high-frequency pulsating boost current is applied, causing the stator to generate an asymmetrical alternating magnetomotive force, continuously producing pulsating electromagnetic pull.

[0023] To address the shortcomings of the aforementioned charging control methods, this application proposes a charging control method. The solution of this application's embodiment is as follows: by determining the voltage difference between the vehicle battery and the charging pile, and then determining the charging winding information in the coil windings based on the voltage difference, and finally combining the design of the nine-phase drive bridge arm and nine coil windings, the nine-phase drive bridge arm is driven and controlled according to the charging winding information. That is, the entire charging control process uses the design of the nine-phase drive bridge arm and nine coil windings, and is controlled in conjunction with the voltage difference between the vehicle battery and the charging pile. This allows for charging control through a new charging method without the need for a DC-DC boost converter.

[0024] It should be noted that the executing entity in this embodiment can be a computing server with data processing, network communication, and program execution functions, such as a controller or drive controller for charging control. The following description uses a drive controller as an example to illustrate this embodiment and the subsequent embodiments.

[0025] Based on this, embodiments of this application provide a charging control method, referring to... Figure 1 , Figure 1 This is a schematic flowchart of the first embodiment of the charging control method of this application.

[0026] Reference Figure 1 This application provides a charging control method applied to a charging control system. The charging control system is connected to a vehicle battery and a charging pile. The charging control system includes a nine-phase drive axle arm and nine coil windings. The nine-phase drive axle arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. The charging control method includes: Step S10: Obtain the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determine the voltage difference between the first charging voltage and the second charging voltage. For example, the charging control method is applied to a charging control system, which is connected to both the vehicle battery and the charging pile. The charging control system includes a nine-phase drive axle arm and nine coil windings. The nine-phase drive axle arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. That is, it expands the original three-phase drive axle arm to a nine-phase drive axle arm and nine coil windings. In this case, every three coil windings can be wound around one stator of the motor, and the nine-phase drive axle arm and nine coil windings are combined for vehicle charging control to avoid the impact of existing three-phase charging on lifespan, noise, and the inability to adaptively select. For example, refer to... Figure 3 , Figure 3 This is a circuit design diagram of the charging control method in this application. The independent three-phase symmetrical coil windings are L1-L2-L3, L4-L5-L6, and L7-L8-L9, respectively. All nine phase coil windings are independently led out and share a common neutral point. A nine-phase full-bridge inverter is also included, with each phase equipped with independent upper and lower bridge switches. Each phase coil winding, independently or in combination, can serve as a Boost energy storage inductor, and multiple equivalent inductance levels can be achieved through switching. (Example) whenThe system employs various charging methods: single-coil independent winding (equivalent inductance L1), two sets of coil windings in parallel (equivalent inductance L2), and three sets of coil windings in parallel (equivalent inductance L3). Simultaneously, the vehicle controller collects real-time data on charging pile voltage, battery voltage, winding temperature, and insulation status, automatically matching the optimal inductance level to suppress current ripple, power-on surges, and magnetic flux saturation at their source. For example, low-dropout, low-power pre-charging utilizes only 1-3 phases; medium-dropout conventional fast charging utilizes 6 phases with two sets of three-phase windings interleaved in parallel; and high-dropout peak fast charging utilizes all 9 phases in a shunt configuration, allowing for targeted charging control for different scenarios. It is worth noting that at this time, independent Clarke / Park current decoupling closed-loop control is performed on the three independent three-phase windings respectively. The internal synthesized magnetomotive force of each three-phase winding is reduced to zero, and the magnetomotive forces of the three windings compensate each other. The total armature magnetomotive force of the stator is always zero. This allows the multi-phase windings that are engaged in boosting to adopt uniform phase offset interleaved PWM (Pulse Width Modulation) modulation, which greatly reduces high-frequency magnetic field harmonics and eliminates resonance noise from the casing and chassis. Combined with the third-order gradient soft-start strategy, the instantaneous shock jitter during operating condition switching is eliminated.

[0027] Specifically, during the charging control process, the system communicates with both the vehicle battery and the charging station to obtain the first charging voltage of the vehicle battery and the second charging voltage of the charging station. The first charging voltage refers to the required charging voltage value for the vehicle battery, and the second charging voltage refers to the charging voltage that the charging station can output. This allows the system to determine the voltage difference between the first and second charging voltages, thus identifying the voltage value required for boosting the voltage using the nine-phase drive bridge arm and nine coil windings. The system then selectively chooses the appropriate coil winding from the nine coil windings for targeted voltage boosting control to ensure effective overall charging control.

[0028] Step S20: Determine the charging winding information in the coil winding based on the voltage difference, and drive the nine-phase drive bridge arm according to the charging winding information to achieve charging of the vehicle battery.

[0029] In this embodiment, after determining the voltage difference, the charging winding information is determined based on the voltage difference in the coil windings. This charging winding information refers to which of the nine coil windings need to be used for charging control. Ultimately, the corresponding drive arm is controlled based on the required coil windings to perform voltage boost control. For example, the principle of the nine-phase drive arm is as follows: assuming coil winding A needs to be used, a first charging circuit is formed between the drive arm A1 corresponding to coil winding A and the charging pile, and then coil winding A is charged according to the first charging circuit. After charging is complete, a second charging circuit is formed between drive arm A1, the charging pile, and the vehicle battery. The charging pile and coil winding A in the second charging circuit charge the vehicle battery together to ensure effective charging. Of course, this equivalent control principle applies when multiple coil windings exist, but it will not be explained in detail here. Furthermore, since the entire process requires the use of 3, 6, and 9 coil windings, the 3, 6, and 9 coil windings can ultimately achieve a driving angle deviation of 0, thereby reducing noise issues and ensuring charging performance.

[0030] In this embodiment, a charging control method is provided, applied to a charging control system. The charging control system is connected to a vehicle battery and a charging pile. The charging control system includes a nine-phase drive bridge arm and nine coil windings. The nine-phase drive bridge arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. By acquiring the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determining the voltage difference between the first and second charging voltages, the charging winding information is determined in the coil windings based on the voltage difference. The nine-phase drive bridge arm is then driven and controlled according to the charging winding information to charge the vehicle battery. This charging control method determines the voltage difference between the vehicle battery and the charging pile, and then determines the charging winding information in the coil windings based on the voltage difference. Ultimately, by combining the design of the nine-phase drive axle arm and the nine coil windings, the drive control of the nine-phase drive axle arm is performed based on the winding information used for charging. That is, the entire charging control process uses the design of the nine-phase drive axle arm and the nine coil windings, and is controlled in combination with the voltage difference between the vehicle battery and the charging pile. This allows for charging control to be achieved through a new charging method without the need for a DC-DC boost converter.

[0031] Furthermore, based on the first embodiment of this application described above, a second embodiment of the charging control method of this application is proposed. In this embodiment, the step of determining the charging winding information based on the voltage difference in the coil winding includes: Step S21: When the voltage difference is less than the first voltage threshold, determine the information of three coil windings as charging windings in the coil windings. Step S22: When the voltage difference is less than the second voltage threshold and the voltage difference is greater than or equal to the first voltage threshold, determine six coil windings in the coil windings as charging winding information, wherein the second voltage threshold is greater than the first voltage threshold. Step S23: When the voltage difference is greater than or equal to the second voltage threshold, determine the information of all coil windings used for charging.

[0032] In this embodiment, when charging is required, the VCU (Vehicle Control Unit) completes a communication handshake with the charging pile, acquires the second charging voltage Vin of the charging pile, and determines the first charging voltage of the vehicle battery by real-time detection of the bus voltage (i.e., the bus voltage is used as the first charging voltage at this time). The voltage difference ΔV = |Vb - Vin| is calculated, and then three basic ranges are divided based on the voltage difference. For example, in the low-voltage, low-voltage-difference range, where ΔV ≤ 100V (for 800V high-voltage direct charging and scenarios with minimal voltage difference, 100V is the first voltage threshold), three coil windings can be selected as the charging windings, i.e., a single set of three-phase parallel L1 inductors is used. Simultaneously, by adjusting the IGBT frequency and duty cycle, heat loss is significantly reduced. When in the medium voltage difference range, where 100V < ΔV ≤ 350V (for mainstream 500V charging piles charging 800V batteries, 350V is the second voltage threshold), six coil windings are selected as the charging windings. This involves two sets of parallel L2 inductors, with 6-phase PWM phase offsets and interleaved control to balance heat generation and suppress harmonic noise. When in the large voltage difference range, where ΔV > 350V (for older 200V / 400V low-voltage charging piles charging 800V high-voltage batteries), all coil windings are selected as the charging windings. This involves closing three sets of 3-phase parallel boost circuits, connecting all nine phases in parallel, and simultaneously offsetting the nine phases of PWM by 40° to reduce current stress in individual windings and suppress magnetic flux saturation. Furthermore, the appropriate coil winding can be adaptively selected for different voltage differences. Of course, when three or six coil windings are in operation, they can be selected randomly or according to the number of times they are in operation. They can also be adaptively selected according to the specific voltage difference, which is not limited here.

[0033] Furthermore, the charging control system also includes a coil winding parameter acquisition module. After determining the charging winding information based on the voltage difference in the coil winding, the system includes: Step S24: Obtain the charging parameter data of the coil winding collected by the parameter acquisition module, and determine the target number of coil windings for charging using the winding information; Step S25: For each coil winding, determine the usage priority of the coil winding in the preset parameter application table based on the charging parameter data, and update the charging winding information according to the usage priority of the coil winding and the target number of coil windings.

[0034] In this embodiment, besides randomly selecting the coil windings to be engaged, selection can also be based on the parameters of the coil windings themselves. For example, each phase coil winding can be independently equipped with a temperature sensor, and the SiC (Silicon Carbide) devices (upper and lower bridge switching transistors) can be configured with independent junction temperature sampling. This allows for selection based on the temperature of the coil windings and the temperature of the switching transistors. For instance, in low-power conditions, the number of engaged coil windings can be reduced to decrease ineffective heat generation; single-channel coil windings or SiC windings can be individually disconnected when they overheat, with the remaining coil windings sharing the power to maintain uninterrupted charging; when a decrease in insulation impedance or a partial discharge signal is detected in the coil windings, the large inductance level is automatically switched and the switching frequency is reduced; in high-power conditions, multi-phase current shunting reduces the current stress on a single coil winding, minimizing temperature rise and fatigue damage from thermal cycling. In other words, the entire process can also utilize the charging parameter data of the coil windings, such as temperature, boostable voltage, and number of uses, as well as the temperature, lifespan, and response speed of the upper and lower bridge switching transistors, to select the corresponding coil windings and control the driving bridge arms (i.e., the upper and lower bridge switching transistors). At this point, by combining the target number of coil windings (i.e., how many coil windings are needed), the priority of each coil winding can be determined in the preset parameter application table based on the charging parameter data of each coil winding. For example, taking a boost voltage scenario, assuming a boost voltage of HV is required, and coil windings L1-L3 are suitable for boosting to HV, then coil windings L1-L3 and their corresponding drive bridge arms can be used as the charging windings. Alternatively, selection can be based on temperature; if the temperature of coil windings L4-L6 is suitable, then coil windings L4-L6 and their corresponding drive bridge arms can be used as the charging windings. Of course, the priority can also be determined by combining temperature and boost voltage, or by combining relevant parameters of the switching transistors. These factors will not be elaborated here; priorities can include voltage difference, temperature, and lifespan, etc. Charging control is then achieved through nine-phase drive bridge arms and nine coil windings to ensure overall charging efficiency by increasing selectivity during the charging process.

[0035] Furthermore, each phase coil winding is equipped with an independent current inner-loop PI (Proportional-Integral Controller) regulator to correct the PWM duty cycle of each phase in real time, ensuring that the current difference between the coil windings of each phase operating in closed mode is ≤3%, thus avoiding long-term overcurrent heating and aging of a single coil winding. Temperature can also be used for coil winding protection control. For example, if the temperature of a single-channel coil winding exceeds 150℃ or the SiC junction temperature exceeds 165℃ during operation, the upper and lower bridge drives of that phase are immediately blocked, the corresponding contactor is disconnected, and the boost branch is cut off. The remaining working windings automatically redistribute the charging power, ensuring uninterrupted fast charging. When the high-voltage insulation monitoring motor winding impedance is lower than the safety threshold or a partial discharge signal is detected, the three sets of motor inductor topologies are automatically switched to reduce the Boost switching frequency, decrease the high-frequency pulse voltage stress between turns, and delay insulation cracking and breakdown failure. In low-power charging conditions, the number of phases in operation is strictly limited, and idle windings are completely de-energized to eliminate ineffective heat loss and slow down insulation thermal aging. It is also worth noting that when charging is not required, the motor control uses nine-phase space vector modulation to output drive torque, and the windings only work as drive armatures, without boost high-frequency pulsation losses.

[0036] Furthermore, based on the first and / or second embodiments of this application described above, a third embodiment of the charging control method of this application is proposed. In this embodiment, the step of driving the nine-phase drive bridge arm according to the charging winding information includes: Step a, determine the target coil winding in the charging winding information, and determine the target drive arm of the nine-phase drive arm where the target coil winding is located. Step b: Drive the target drive arm according to the preset start-up drive mode.

[0037] In this embodiment, during the drive control of the nine-phase drive bridge arm, the target coil winding in the charging winding information can be determined, and the target drive bridge arm in the nine-phase drive bridge arm can be determined. The target coil winding refers to the coil winding that needs to be charged, and the target drive bridge arm refers to the drive bridge arm that performs charging control on the target coil winding. Then, the target drive bridge arm is driven according to the preset start-up drive mode. For example, the preset start-up drive mode can be a three-stage shockless soft-start process. The entire process is divided into the first-stage pre-energy storage stage (0-200ms): the IGBT's PWM duty cycle is 0-0.2, and a small current slowly establishes the winding magnetic field without instantaneous electromagnetic shock; the second-stage gradient boost stage (200-600ms): the IGBT's PWM duty cycle is linearly increased from 0.2-0.6, and the bus voltage is smoothly increased to suppress current spikes; the third-stage constant power closed-loop stage: the duty cycle is adjusted to the target closed-loop value to stabilize the charging power output; the impact current is controlled within the rated current throughout the process to eliminate vehicle body vibration and jerking. This ensures the driving effect of the entire charging control process. Of course, other starting driving methods can also be used. For example, different driving methods can be selected for different voltage differences. If the voltage difference is relatively small (below the first voltage threshold), only the above second-order and third-order control can be used. If the voltage difference is relatively large (below the first voltage threshold), the third-order shockless soft-start process can be used. Of course, the starting control can also be combined with the actual coil winding temperature and the temperature of the switching tube, which will not be explained in detail here.

[0038] In another embodiment, the charging control system further includes a positive switch and a negative switch that directly connect the vehicle battery and the charging pile, and a boost switch that directly connects the second end of the coil winding and the charging pile. After determining the voltage difference between the first charging voltage and the second charging voltage, the system includes: Step c: When the voltage difference is less than the preset boost threshold, a direct charging control command is generated. The direct charging control command is used to control both the positive and negative switch tubes to be turned on so that the charging pile can directly charge the vehicle battery. Step d: When the voltage difference is greater than or equal to the preset boost threshold, a boost control command is generated, and the step of determining the charging winding information in the coil winding based on the voltage difference is executed. The boost control command is used to control both the boost switch and the negative switch to be turned on so that the voltage of the charging pile is boosted to charge the vehicle battery.

[0039] In this embodiment, refer to Figure 3The charging control system also includes a positive switch and a negative switch that directly connect the vehicle battery and the charging pile, and a boost switch that directly connects the second end of the coil winding to the charging pile. If the voltage difference is determined to be less than a preset boost threshold, a direct charging control command is generated. This command controls both the positive and negative switches to be turned on, allowing the charging pile to directly charge the vehicle battery. The preset boost threshold is a user-defined threshold that must be less than a first voltage threshold, such as 0 or below, in which case the charging pile can be used to directly charge the vehicle battery. In another embodiment, when the voltage difference is greater than or equal to a preset boost threshold, a boost control command is generated. The boost control command is used to control both the boost switch and the negative switch to be turned on, so that the voltage of the charging pile is boosted to charge the vehicle battery. After the boost control command controls both the boost switch and the negative switch to be turned on, the step of determining the charging winding information in the coil winding based on the voltage difference is executed to ensure the accuracy of subsequent boost charging control.

[0040] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the charging control method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0041] This application also provides a charging control system, which is connected to a vehicle battery and a charging pile. The charging control system includes a drive controller, a nine-phase drive axle arm, and nine coil windings. The nine-phase drive axle arm is connected to the vehicle battery and the first end of the coil windings. The second end of the coil windings is connected to the charging pile. The drive controller is connected to the nine-phase drive axle arm, the vehicle battery, and the charging pile. (Refer to...) Figure 4 The drive controller includes: The data acquisition module A10 is used to acquire the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and to determine the voltage difference between the first charging voltage and the second charging voltage. The charging control module A20 is used to determine the charging winding information in the coil winding based on the voltage difference, and to drive the nine-phase drive bridge arm according to the charging winding information to achieve charging of the vehicle battery.

[0042] It is worth noting that the charging control system can execute the above charging control method. By determining the voltage difference between the vehicle battery and the charging pile, it then determines the charging winding information in the coil windings based on the voltage difference. Finally, combined with the design of the nine-phase drive bridge arm and nine coil windings, it drives the nine-phase drive bridge arm according to the charging winding information. That is, the entire charging control process uses the design of the nine-phase drive bridge arm and nine coil windings, and combines the voltage difference between the vehicle battery and the charging pile for control. This allows for charging control through a new charging method without the need for a DC-DC boost converter. Of course, the charging control method of this application can also be executed for other terminals or systems, and is not limited here.

[0043] In one embodiment, the nine-phase drive axle arm includes three sets of three-phase drive axle arms. The positive terminals of each set of three-phase drive axle arms are connected together and then connected to the positive terminal of the vehicle battery B. The negative terminals of each set of three-phase drive axle arms are connected together and then connected to the negative terminal of the vehicle battery B. The control terminal of the three-phase drive axle arm is connected to the drive controller. The output terminal of one three-phase drive axle arm is connected to the first terminal of three coil windings respectively. The three-phase drive bridge arm includes three drive bridge arms. The positive terminals of each drive bridge arm are connected together to form the positive terminal of the three-phase drive bridge arm, and the negative terminals of each drive bridge arm are connected together to form the negative terminal of the three-phase drive bridge arm. The control terminal of each drive bridge arm is connected to the drive controller. The output terminal of each drive bridge arm is connected to the first terminal of a coil winding. Each drive bridge arm includes: The upper bridge switch transistor has its first end serving as the positive terminal of the drive bridge arm and its second end serving as the control terminal of the drive bridge arm. The lower bridge switch is connected to the first end of the upper bridge switch and then to the first end of the coil winding. The second end of the lower bridge switch serves as the control end of the drive bridge arm, and the third end of the lower bridge switch serves as the negative terminal of the drive bridge arm.

[0044] In this embodiment, the nine-phase drive bridge arm includes three sets of three-phase drive bridge arms. The positive terminals of each set of three-phase drive bridge arms are connected together and then connected to the positive terminal of the vehicle battery B. The negative terminals of each set of three-phase drive bridge arms are connected together and then connected to the negative terminal of the vehicle battery B. The control terminals of the three-phase drive bridge arms are connected to the drive controller. The output terminals of one three-phase drive bridge arm are respectively connected to the first terminals of three coil windings. That is, each set of three-phase drive bridge arms is a circuit that drives three coil windings. Thus, the three sets of three-phase drive bridge arms form the entire nine-phase drive bridge arm. Each three-phase drive bridge arm consists of three drive bridge arms, and each drive bridge arm includes an upper bridge switch and a lower bridge switch, such as... Figure 3In this circuit, odd-numbered switching transistors such as Q1, Q3, and Q5 are the upper bridge switching transistors, while even-numbered switching transistors such as Q2, Q4, and Q6 are the lower bridge switching transistors. This allows the corresponding coil windings to be driven according to the nine-phase drive bridge arms, thereby achieving voltage boost during the charging process. By expanding the selectivity of the coil windings and upper and lower bridge switching transistors during the voltage boost process, the charging effect can be guaranteed, and charging control can be achieved without the need for a DC-DC boost converter.

[0045] In another embodiment, the charging control system further includes: Positive switch Q19, the first end of positive switch Q19 is connected to the positive terminal of vehicle battery B, and the second end of positive switch Q19 is connected to drive controller; The negative switch Q20 has its first terminal connected to the negative terminal of the vehicle battery B, its second terminal connected to the drive controller, and its third terminal connected to the negative terminal of the charging pile DC. The boost switch Q21 has its first terminal connected to the third terminal of the positive switch Q19, its second terminal connected to the drive controller, and its third terminal connected to the positive terminal of the charging pile's DC power supply.

[0046] In this embodiment, refer to Figure 3 The charging control system also includes a positive switch Q19, a negative switch Q20, and a boost switch Q21. When no boosting is needed, the positive and negative switches Q19 and Q20 can be turned on to directly charge the vehicle battery B. When a boost is required, the boost and negative switches Q21 and Q20 are turned on to perform boost charging through the three-phase drive bridge arm and nine coil windings. When charging is not needed, the positive, negative, and boost switches Q19, Q20, and Q21 can be turned off to allow normal motor drive, thus greatly improving the overall system functionality.

[0047] The drive controller provided in this application employs the charging control method described in the above embodiments, aiming to solve the technical problem of how to achieve charging control without the need for a DC-DC boost converter. Compared with the prior art, the beneficial effects of the drive controller provided in this application are the same as those of the charging control method provided in the above embodiments, and other technical features in the drive controller are the same as those disclosed in the above embodiments, and will not be repeated here.

[0048] This application provides a charging control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the charging control method in the above embodiment 1.

[0049] The following is for reference. Figure 5 The diagram illustrates a structural schematic suitable for implementing the charging control device in the embodiments of this application. The charging control device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The charging control device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0050] like Figure 5 As shown, the charging control device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory 1002 or a program loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the charging control device. The processing unit 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems can be connected to the input / output interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the charging control device to communicate wirelessly or wiredly with other charging control devices to exchange data. Although the figures show charging control devices with various systems, it should be understood that implementing or having all of the systems shown is not required. More or fewer systems may be implemented alternatively.

[0051] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or loaded from storage device 1003, or loaded from read-only memory 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0052] The charging control device provided in this application employs the charging control method described in the above embodiments, aiming to solve the technical problem of how to achieve charging control without the need for a DC-DC boost converter. Compared with the prior art, the beneficial effects of the charging control device provided in this application are the same as those of the charging control method provided in the above embodiments, and other technical features of the charging control device are the same as those disclosed in the above embodiments, and will not be repeated here.

[0053] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0054] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0055] This application provides a computer storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the charging control method in the above embodiments.

[0056] The computer storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), or any suitable combination thereof.

[0057] The aforementioned computer storage medium may be included in the charging control device; or it may exist independently and not be assembled into the charging control device.

[0058] The aforementioned computer storage medium carries one or more programs, which, when executed by the charging control device, cause the charging control device to perform the following: Obtain the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determine the voltage difference between the first charging voltage and the second charging voltage; The charging winding information is determined in the coil winding based on the voltage difference, and the nine-phase drive axle arm is driven and controlled according to the charging winding information to achieve charging of the vehicle battery.

[0059] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0060] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation that may be implemented in systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0061] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0062] The computer storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the above-described charging control method, aiming to solve the technical problem of how to achieve charging control without the need for a DC-DC boost converter. Compared with the prior art, the beneficial effects of the computer storage medium provided in this application are the same as those of the charging control method provided in the above embodiments, and will not be repeated here.

[0063] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the charging control method described above.

[0064] The computer program product provided in this application aims to solve the technical problem of how to achieve charging control without the need for a DC-DC boost converter. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the charging control method provided in the above embodiments, and will not be repeated here.

[0065] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A charging control method, characterized in that, The charging control method is applied to a charging control system, which is connected to both the vehicle battery and the charging pile. The charging control system includes a nine-phase drive arm and nine coil windings. The nine-phase drive arm is connected to the vehicle battery and the first end of each coil winding. The second end of each coil winding is connected to the charging pile. The charging control method includes: Obtain the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and determine the voltage difference between the first charging voltage and the second charging voltage; Based on the voltage difference, the charging winding information is determined in the coil winding, and the nine-phase drive bridge arm is driven and controlled according to the charging winding information to achieve charging of the vehicle battery.

2. The charging control method as described in claim 1, characterized in that, The step of determining the charging winding information in the coil winding based on the voltage difference includes: When the voltage difference is less than the first voltage threshold, three coil windings in the coil windings are identified as charging windings. When the voltage difference is less than the second voltage threshold and the voltage difference is greater than or equal to the first voltage threshold, six coil windings in the coil windings are identified as charging windings, wherein the second voltage threshold is greater than the first voltage threshold. When the voltage difference is greater than or equal to the second voltage threshold, all coil windings are identified as windings used for charging.

3. The charging control method as described in claim 2, characterized in that, The charging control system further includes a parameter acquisition module for the coil winding. After the step of determining the charging winding information based on the voltage difference in the coil winding, the system includes: The charging parameter data of the coil winding collected by the parameter acquisition module is obtained, and the target number of coil windings for charging is determined. For each coil winding, the usage priority of the coil winding is determined in a preset parameter application table based on the charging parameter data, and the charging winding information is updated according to the usage priority of the coil winding and the target number of coil windings.

4. The charging control method as described in claim 1, characterized in that, The step of driving the nine-phase drive bridge arm according to the charging winding information includes: The target coil winding in the charging winding information is determined, and the target drive arm of the target coil winding in the nine-phase drive arm is determined. The target drive arm is driven and controlled according to a preset start-up drive mode.

5. The charging control method according to any one of claims 1 to 4, characterized in that, The charging control system further includes a positive switch and a negative switch that directly connect the vehicle battery and the charging pile, and a boost switch that directly connects the second end of the coil winding and the charging pile. After the step of determining the voltage difference between the first charging voltage and the second charging voltage, the system includes: When the voltage difference is less than a preset boost threshold, a direct charging control command is generated, wherein the direct charging control command is used to control both the positive and negative switch tubes to be turned on, so that the charging pile directly charges the vehicle battery; When the voltage difference is greater than or equal to a preset boost threshold, a boost control command is generated, and the step of determining the charging winding information in the coil winding based on the voltage difference is executed. The boost control command is used to control both the boost switch and the negative switch to be turned on, so that the voltage of the charging pile is boosted to charge the vehicle battery.

6. A charging control system, characterized in that, The charging control system is connected to the vehicle battery and the charging pile respectively. The charging control system includes a drive controller, a nine-phase drive axle arm, and nine coil windings. The nine-phase drive axle arm is connected to the vehicle battery and the first end of each coil winding. The second end of each coil winding is connected to the charging pile. The drive controller is connected to the nine-phase drive axle arm, the vehicle battery, and the charging pile. The drive controller includes: The data acquisition module is used to acquire the first charging voltage of the vehicle battery and the second charging voltage of the charging pile, and to determine the voltage difference between the first charging voltage and the second charging voltage. The charging control module is used to determine the charging winding information in the coil winding based on the voltage difference, and to drive the nine-phase drive bridge arm according to the charging winding information to achieve charging of the vehicle battery.

7. The charging control system as described in claim 6, characterized in that, The nine-phase drive axle arm includes three sets of three-phase drive axle arms. The positive terminals of each set of three-phase drive axle arms are connected together and then connected to the positive terminal of the vehicle battery. The negative terminals of each set of three-phase drive axle arms are connected together and then connected to the negative terminal of the vehicle battery. The control terminal of the three-phase drive axle arm is connected to the drive controller. The output terminal of one three-phase drive axle arm is connected to the first terminal of the three coil windings respectively. The three-phase drive bridge arm includes three drive bridge arms. The positive terminals of each drive bridge arm are connected together to form the positive terminal of the three-phase drive bridge arm, and the negative terminals of each drive bridge arm are connected together to form the negative terminal of the three-phase drive bridge arm. The control terminal of each drive bridge arm is connected to the drive controller, and the output terminal of each drive bridge arm is connected to the first terminal of a coil winding. Each drive bridge arm includes: An upper bridge switch transistor, wherein the first end of the upper bridge switch transistor serves as the positive terminal of the drive bridge arm, and the second end of the upper bridge switch transistor serves as the control terminal of the drive bridge arm; The lower bridge switch has its first end connected to the third end of the upper bridge switch and then connected to the first end of the coil winding. The second end of the lower bridge switch serves as the control end of the drive bridge arm, and the third end of the lower bridge switch serves as the negative terminal of the drive bridge arm.

8. The charging control system as described in claim 7, characterized in that, The charging control system further includes: A positive switch transistor, wherein the first end of the positive switch transistor is connected to the positive terminal of the vehicle battery, and the second end of the positive switch transistor is connected to the drive controller; A negative terminal switch is provided, with its first end connected to the negative terminal of the vehicle battery, its second end connected to the drive controller, and its third end connected to the negative terminal of the charging pile. A boost switch transistor is provided, with its first end connected to the third end of the positive switch transistor, its second end connected to the drive controller, and its third end connected to the positive terminal of the charging pile.

9. A charging control device, characterized in that, The charging control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the charging control method as described in any one of claims 1 to 5.

10. A computer storage medium, characterized in that, The computer storage medium stores a charging control program, wherein when the charging control program is executed by a processor, it implements the steps of the charging control method as described in any one of claims 1 to 5.

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