Vehicle charging control method and device, vehicle, equipment and medium

Abstract

The invention discloses a vehicle charging control method and device, a vehicle, equipment and a medium. The vehicle charging control method comprises the steps that a charging request signal is sent to a charging pile; under the condition that a charging pile input voltage signal provided by the charging pile in response to the charging request signal is received, a power battery of the vehicle is charged based on the charging pile input voltage signal; based on the voltage signal of the power battery, a charging feedback signal in the charging process of the power battery, a charging request signal, a maximum output voltage signal of the charging pile and an input voltage signal of the charging pile, determining whether the charging pile has the capability of boosting and charging the power battery; and sending a boost charging request to the charging pile under the condition that it is determined that the charging pile has the capability of performing boost charging on the power battery.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a vehicle charging control method, device, vehicle, equipment and medium. Background Art

[0002] As the number of electric vehicles continues to rise, the number of charging stations has also increased, but the car-to-charging ratio has actually increased. With the number of charging stations dwindling, fast charging technology is essential to reduce charging station occupancy time. The 800V platform for electric vehicles is the mainstream choice for fast charging. To minimize charging station occupancy time, it is essential to maximize charging power while ensuring battery safety and reliability.

[0003] Related technology When a vehicle is charged at a low SOC (State of Charge), the starting voltage is low. During the boost charging process, as the battery SOC increases, the voltage request from the low-voltage side to the charging pile remains at the charging starting state, resulting in an increase in the voltage difference between the front and rear ends, which not only affects the charging efficiency but also is not conducive to improving the utilization rate of the charging pile. Summary of the Invention

[0004] The embodiments of the present application aim to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiments of the present application aim to provide a vehicle charging control method, apparatus, vehicle, device and medium.

[0005] An embodiment of the present application provides a vehicle charging control method, which includes: sending a charging request signal to a charging pile; charging the vehicle's power battery based on the charging pile input voltage signal when receiving a charging pile input voltage signal provided by the charging pile in response to the charging request signal; determining whether the charging pile is capable of boost charging the power battery based on the power battery voltage signal, a charging feedback signal during the power battery charging process, a charging request signal, a maximum output voltage signal of the charging pile, and the charging pile input voltage signal; and sending a boost charging request to the charging pile when it is determined that the charging pile is capable of boost charging the power battery.

[0006] Exemplarily, based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile and the input voltage signal of the charging pile, determining whether the charging pile is capable of boost charging the power battery includes: determining the duty cycle based on the voltage signal of the power battery and the input voltage signal of the charging pile; when the duty cycle meets the first preset condition, determining whether the charging pile is capable of boost charging the power battery based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal.

[0007] Exemplarily, the voltage signal of the power battery includes the battery voltage, the maximum output voltage signal of the charging pile includes the maximum output voltage of the charging pile, the charging feedback signal includes the feedback current and the feedback voltage, and the charging request signal includes the demand voltage and the demand current; based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal, it is determined whether the charging pile is capable of boost charging the power battery, including: within the preset time, the demand current and the feedback current meet the second preset condition, and the maximum output voltage, demand voltage, feedback voltage and battery voltage of the charging pile meet the third preset condition, then it is determined that the charging pile is capable of boost charging the power battery.

[0008] Exemplarily, within the preset time, the demand current and the feedback current satisfy the second preset condition, including: within the preset time, the absolute value of the difference between the demand current and the feedback current is less than a first preset threshold, and the feedback current is greater than a second preset threshold.

[0009] Exemplarily, the maximum output voltage, demand voltage, feedback voltage, and battery voltage of the charging pile meet a third preset condition, including: the difference between the maximum output voltage of the charging pile and the feedback voltage is greater than a third preset threshold, and the difference between the battery voltage and the feedback voltage is greater than the third preset threshold.

[0010] Exemplarily, the vehicle charging control method further includes: adjusting a duty cycle of the charging feedback signal based on the charging request signal.

[0011] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase B. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the feedback current of phase B; adjusting the duty cycle of the lower bridge of phase B based on the correction amount and the feedback current of phase B.

[0012] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase C. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the C-phase feedback current; adjusting the duty cycle of the lower bridge of phase C based on the correction amount and the C-phase feedback current.

[0013] Exemplarily, the vehicle charging control method also includes: stopping the charging pile from continuing to boost voltage under preset stop conditions; wherein, the preset stop conditions include at least one of the following: the absolute value of the difference between the demand current and the feedback current is greater than or equal to a first preset threshold; the difference between the battery voltage and the demand voltage is less than or equal to a third preset threshold; the difference between the maximum output voltage of the charging pile and the feedback voltage is less than or equal to the third preset threshold.

[0014] Another embodiment of the present application provides a vehicle charging control device, which includes: a first sending module for sending a charging request signal to a charging pile; a receiving module for charging the vehicle's power battery based on the charging pile input voltage signal when receiving the charging pile input voltage signal provided by the charging pile in response to the charging request signal; a determination module for determining whether the charging pile is capable of boost charging the power battery based on the power battery voltage signal, the charging feedback signal during the power battery charging process, the charging request signal, the charging pile maximum output voltage signal and the charging pile input voltage signal; and a second sending module for sending a boost charging request to the charging pile when it is determined that the charging pile is capable of boost charging the power battery.

[0015] Another embodiment of the present application provides a vehicle, including a controller and a battery system, wherein the controller includes a boost module, and the controller is used to implement the steps of the method of any of the above embodiments.

[0016] Another embodiment of the present application provides an electronic device having a computer program stored thereon, which implements the steps of the method of any of the above embodiments when the computer program is executed by a processor.

[0017] Another embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method of any of the above embodiments are implemented.

[0018] In the above-described embodiment, the vehicle charging control method includes: sending a charging request signal to a charging pile; upon receiving a charging pile input voltage signal provided by the charging pile in response to the charging request signal, charging the vehicle's power battery based on the charging pile input voltage signal; determining whether the charging pile is capable of boost charging the power battery based on the power battery voltage signal, a charging feedback signal during battery charging, a charging request signal, a maximum output voltage signal of the charging pile, and the charging pile input voltage signal; and upon determining that the charging pile is capable of boost charging the power battery, sending a boost charging request to the charging pile. By real-time monitoring of the charging pile's capability and the battery's allowable boost charging conditions, boost charging is performed when the charging pile's capability and the battery's allowable conditions are met, thereby reducing charging time and improving charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a vehicle charging control method provided in an embodiment of the present application;

[0020] Figure 2 A vehicle charging circuit diagram provided for an embodiment of the present application;

[0021] Figure 3A schematic diagram of vehicle charging provided in accordance with an embodiment of the present application;

[0022] Figure 4 Schematic diagram of duty cycle adjustment of the lower bridge of phase B and phase C provided in the embodiment of this application;

[0023] Figure 5 A block diagram of a vehicle charging control device provided in another embodiment of the present application;

[0024] Figure 6 A block diagram of an electronic device provided in accordance with another embodiment of the present application. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0026] As the number of electric vehicles gradually increases, the number of charging piles has also increased, but the car-to-pile ratio has increased instead of decreased. When the number of charging piles cannot keep up, fast charging technology is very necessary to reduce the time charging piles are occupied. The increase in charging power is P in P = U·I (P charging power, U charging voltage, I charging current). Therefore, if you want to increase the charging power, keep one of the voltage or current unchanged. Increasing the voltage or current can increase the charging power. Therefore, the 800V platform of electric vehicles is the mainstream choice for achieving fast charging.

[0027] In order to make full use of the existing 500V and 750V charging piles on the market, it is necessary to integrate the Boost module into the electric drive. In order to reduce the occupancy time of the charging pile as soon as possible, it is necessary to increase the charging power as much as possible while ensuring the safety and reliability of the battery.

[0028] There are currently two main Boost charging technologies: one is to not test the charging pile capacity, but directly take the smaller value based on the current battery pack voltage and the voltage capacity of the pile, and then request charging from the charging pile based on this voltage limit, using a constant current charging method. During the charging process, the voltage request remains unchanged, and the charging current is adjusted according to the battery SOC (State of Charge) status; the second is to test the charging pile capacity after Boost and the charging pile complete the initial handshake and enter charging. In constant current mode, by adjusting the charging voltage request, it is tested whether the charging pile at different voltages can reach its capacity limit, so that charging can be performed near the upper limit of the voltage capacity to meet the demand for higher power charging.

[0029] Related technology When a vehicle is charged at a low SOC (State of Charge), the starting voltage is low. During the boost charging process, as the battery SOC increases, the voltage request from the low-voltage side to the charging pile remains at the charging starting state, resulting in an increase in the voltage difference between the front and rear ends, which not only affects the charging efficiency but also is not conducive to improving the utilization rate of the charging pile.

[0030] The charging power equation is shown in formula (1):

[0031] P charg =U1*I1*η=U bat *I bat (1)

[0032] Among them, U1 is the output voltage of the charging pile, I1 is the output current of the charging pile, η is the charging efficiency, U bat is the battery pack voltage, I bat Input current for the battery pack.

[0033] The output current I1 of the charging pile is limited by the specifications of the charging pile and the capacity of the Boost charging module. The smaller value of the two is taken. If the output voltage of the charging pile can be further increased while maintaining I1 unchanged, the charging power can be increased.

[0034] The charging efficiency η is positively correlated with the voltage difference and current during charging. The reduction in current after the voltage is increased is beneficial to reducing the loss of the power module, thereby improving the charging efficiency.

[0035] In view of this, an embodiment of the present application provides a vehicle charging control method, which improves charging efficiency by real-time monitoring of the charging capacity of a charging pile.

[0036] Figure 1 This is a flow chart of the vehicle charging control method provided in the embodiment of the present application.

[0037] like Figure 1 As shown, the vehicle charging control method 100 provided in the embodiment of the present application includes, for example, steps S110-S140.

[0038] Step S110: Send a charging request signal to the charging pile.

[0039] For example, the vehicle sends a charging request signal to the charging station, which responds. The charging request signal may include information such as the actual voltage of the vehicle battery and the desired voltage. The charging station may be a DC charging station, meaning that the vehicle can be connected to a DC charging station. In other embodiments, by adjusting the vehicle circuit structure, such as by adding an AC-DC converter, the vehicle circuit structure can also be adapted for AC charging, which is not limited in the present embodiment.

[0040] Step S120 : When receiving a charging pile input voltage signal provided by the charging pile in response to the charging request signal, charging the power battery of the vehicle based on the charging pile input voltage signal.

[0041] For example, a Boost module is integrated into the vehicle's electric drive. The Boost module performs voltage pre-charging and enters the charging process after meeting the handshake charging conditions of the charging pile. The vehicle battery is charged based on the voltage signal input by the charging pile.

[0042] Step S130 , based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile, and the input voltage signal of the charging pile, it is determined whether the charging pile is capable of boosting and charging the power battery.

[0043] For example, the charging feedback signal includes information such as the voltage and current provided to the vehicle battery, derived from the charging pile input voltage via relevant components. When the battery voltage signal, charging request signal, charging feedback signal, charging pile maximum output voltage signal, and charging pile input voltage signal meet preset conditions, the vehicle requests the charging pile to increase its output voltage. The battery voltage signal, charging request signal, charging feedback signal, charging pile maximum output voltage signal, and charging pile input voltage signal are determined in real time, and the charging voltage boost request is also sent in real time.

[0044] Step S140: When it is determined that the charging pile is capable of boosting and charging the power battery, a boost charging request is sent to the charging pile.

[0045] Exemplarily, boost charging includes dynamically adjusting the duty cycle of the charging feedback signal according to the actual state of charge of the power battery when the charging pile is charging the vehicle's power battery, so that the voltage output by the charging pile continues to increase until it reaches the upper limit of the charging pile's capacity, and then continues charging at the upper limit of the charging pile's capacity.

[0046] In the above embodiment, by real-time monitoring of the battery voltage signal, charging request signal, charging feedback signal, charging pile maximum output voltage signal and charging pile input voltage signal, the capacity of the charging pile and the battery-allowed boost charging conditions are judged in real time, and whether the charging pile has the potential to increase power is judged. Boost charging is performed under the conditions of the charging pile capacity and battery permission, thereby reducing charging time, improving charging efficiency, and ensuring that the output voltage of the charging pile meets the maximum power charging requirement.

[0047] Figure 2 A vehicle charging circuit diagram provided for an embodiment of the present application.

[0048] like Figure 2As shown, the vehicle system includes a motor, controller, and battery system, with a Boost module integrated into the vehicle system (including K7, C2, and R2 on the input side of the diagram). Boost voltage is achieved through the following process: In the Boost circuit, when the power switch (K7) is on, the power supply charges C2 to store energy. When the power switch (K7) is off, the energy stored in the motor inductor and the power supply voltage are combined, charging the output capacitor (C1) through a diode, making the output voltage higher than the input voltage, completing the boost. The motor is a three-phase AC motor, with three wires (U, V, and W) connecting the motor's three-phase windings. The three-phase AC power supply supplies power to the motor windings through the U, V, and W wires, generating a rotating magnetic field that drives the motor. The controller controls the power supply through switching elements such as K6, and transmits the power to the battery system to charge the battery.

[0049] Based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile and the input voltage signal of the charging pile, determining whether the charging pile is capable of boost charging the power battery, including: determining the duty cycle based on the voltage signal of the power battery and the input voltage signal of the charging pile; when the duty cycle meets the first preset condition, determining whether the charging pile is capable of boost charging the power battery based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal.

[0050] For example, in practical applications, duty cycle conditions are typically set based on specific system designs. For example, 1-Vin / UdcBat may be required to be within a certain range or meet a specific value. Assume that the duty cycle D = 1-Vin / UdcBat satisfies D_min ≤ D ≤ D_max, where D_min and D_max are the preset minimum and maximum values of the duty cycle.

[0051] For example, the duty cycle is calculated based on the voltage of the power battery and the input voltage of the charging pile. When the duty cycle meets the first preset condition, it is further determined whether the charging pile responds to the current constant current charging current request and whether the voltage has room to rise. The duty cycle is calculated as shown in formula (2):

[0052] D=1-Vin / UdcBat (2)

[0053] In the above formula, Vin represents the charging pile input voltage, and UdcBat represents the battery voltage.

[0054] When the above-mentioned duty cycle conditions are met and the motor controller temperature and motor temperature are within the allowable range, the charging pile is determined to be capable of boost charging the power battery based on the power battery voltage signal, the charging pile maximum output voltage signal, the charging request signal and the charging feedback signal.

[0055] Figure 3 A schematic diagram of vehicle charging principles provided in an embodiment of this application.

[0056] like Figure 3 As shown in the figure, the bus voltage sampling value is the feedback voltage, that is, the battery input voltage, and the output current sampling value is the feedback current, that is, the battery input current. The feedback current of phase A, phase B, and phase C is collected at the same time to serve as the basis for subsequent control of the duty cycle of phase B and phase C.

[0057] The voltage signal of the power battery includes the battery voltage, the maximum output voltage signal of the charging pile includes the maximum output voltage of the charging pile, the charging feedback signal includes the feedback current and the feedback voltage, and the charging request signal includes the demand voltage and the demand current; based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal, determine whether the charging pile is capable of boosting and charging the power battery, including: within the preset time, the demand current and the feedback current meet the second preset condition, and the maximum output voltage, demand voltage, feedback voltage and battery voltage of the charging pile meet the third preset condition, then determine that the charging pile is capable of boosting and charging the power battery.

[0058] Exemplarily, within the preset time, the demand current and the feedback current satisfy the second preset condition, including: within the preset time, the absolute value of the difference between the demand current and the feedback current is less than a first preset threshold, and the feedback current is greater than a second preset threshold.

[0059] The following example illustrates a preset time of 5 seconds, a first preset threshold of 5 A, and a second preset threshold of 100 A, but is not intended to be limiting. For example, within the preset time, the demand current and the feedback current satisfy the second preset condition, including: (|demand current CurDemand - feedback current CurFdb| < 5 A) & (feedback current CurFdb > 100 A) for 5 seconds.

[0060] Exemplarily, the maximum output voltage, required voltage, feedback voltage, and battery voltage of the charging pile meet a third preset condition, including: the difference between the maximum output voltage of the charging pile and the required voltage is greater than a third preset threshold, and the difference between the battery voltage and the feedback voltage is greater than the third preset threshold.

[0061] The third preset threshold value of 20V is used as an example for explanation, but is not intended to be a specific limitation. For example, the maximum output voltage of the charging pile, the demand voltage, the feedback voltage, and the battery voltage satisfying the third preset condition include: ((maximum output voltage of the charging pile Umax - demand voltage VoltDemand) > 20V) & ((battery voltage UdcBat - feedback voltage VoltFdb) > 20V).

[0062] When the above conditions are met, the vehicle sends a charging voltage boost request to the charging pile, so that the charging pile performs boost charging on the battery based on the charging voltage boost request.

[0063] For example, the vehicle's requested voltage VoltDemand for the charging pile is increased at a rate of 5V / s, and the duty cycle of Boost (B-phase lower bridge duty cycle, C-phase lower bridge duty cycle) is adjusted.

[0064] The calculation method of the real-time duty cycle of the lower bridge of phase B and the real-time duty cycle of the lower bridge of phase C is shown in formula (3):

[0065] D=1–VoltDemand / UdcBat (3)

[0066] In formula (3), VoltDemand is the demand voltage, and UdcBat represents the battery voltage.

[0067] In the above embodiment, under the conditions of meeting the preset duty cycle conditions and the demand current and feedback current, the maximum output voltage of the charging pile, the demand voltage and feedback voltage and the battery voltage, the vehicle sends a charging boost request to the charging pile, which is beneficial to protecting the vehicle battery and extending the battery life.

[0068] Figure 4 Schematic diagram of duty cycle adjustment of the lower bridges of phases B and C provided in the implementation manner of this application.

[0069] The vehicle charging control method further includes adjusting a duty cycle of the charging feedback signal based on the charging request signal.

[0070] For example, by adjusting the duty cycle of the charging feedback signal (including the B-phase feedback signal and the C-phase feedback signal), the values of the feedback current and the feedback voltage can be made close to the values of the required current and the required voltage.

[0071] Proportional-integral (PI) control is used to adjust and control charging parameters to ensure a stable, efficient, and safe charging process. The details are as follows:

[0072] PI (Proportional-Integral) control regulates and controls charging parameters to ensure a stable, efficient, and safe charging process. PI control consists of two components: proportional (P) and integral (I). The proportional component quickly generates a corresponding control action based on the current error (the difference between the target value and the actual value), allowing the system to respond. For example, if the charging current does not reach the set value, the proportional component can quickly increase the output to drive the current up; the integral component accumulates the error, gradually eliminating the steady-state error over time, and ensuring that the charging parameters ultimately stabilize at the target value. For example, during a long charging process, if there is a slight deviation, the integral component can slowly adjust the output so that the charging parameters accurately reach the set value.

[0073] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase B. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the feedback current of phase B; adjusting the duty cycle of the lower bridge of phase B based on the correction amount and the feedback current of phase B.

[0074] For example, Figure 4 As shown, PI control is performed according to the charging target current value and the charging feedback current value to obtain a correction amount, and the correction amount and the B-phase feedback current are subjected to PI control to obtain the B-phase lower bridge duty cycle. The switch is controlled based on the B-phase lower bridge duty cycle, so that the demand current is closer to the target current value.

[0075] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase C. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the C-phase feedback current; adjusting the duty cycle of the lower bridge of phase C based on the correction amount and the C-phase feedback current.

[0076] For example, Figure 4 As shown, PI control is performed according to the charging target current value and the charging feedback current value to obtain a correction amount, and the correction amount and the C-phase feedback current are PI controlled to obtain the C-phase lower bridge duty cycle. The switch is controlled based on the C-phase lower bridge duty cycle, so that the demand current is closer to the target current value.

[0077] In feedback regulation of systems such as boost circuits, this application uses current as an example for the following reasons: Overcurrent protection: Current directly reflects the load on components in the circuit. When a circuit fault such as a short circuit occurs, the current increases dramatically, potentially damaging components such as power switches and inductors. Current-based feedback regulation can quickly detect overcurrent conditions, promptly adjust the on / off state of the switch, limit the current, and protect circuit components from damage caused by high current. However, voltage changes during certain short-circuit faults are not rapid or significant, making it difficult to trigger protection in a timely manner. Component stress control: By monitoring and regulating current, component operating stress can be effectively controlled. For example, power switches experience significant current fluctuations during the on / off transitions. Current feedback can be used to appropriately adjust the switch's operating state, reducing its current stress and extending its service life. Voltage feedback cannot directly and accurately control this current stress on components. Addressing rapid load changes: In scenarios where loads fluctuate rapidly, such as frequent motor starts and stops or electronic equipment is subjected to instantaneous loading, current fluctuations can more directly reflect changes in load demand. Based on current feedback regulation, the system can more quickly sense load changes and quickly adjust output to maintain stable power delivery. In contrast, voltage feedback, due to the influence of components such as capacitors, has a relatively slow response speed and cannot meet the needs of rapidly changing loads. Improved transient performance: Current feedback can effectively improve the system's transient performance and reduce output voltage fluctuations during sudden load changes. For example, when the load suddenly increases, current feedback can promptly increase the input current to replenish energy, avoid a significant drop in output voltage, and enable the system to return to a stable state more quickly. Achieve constant current control: Batteries of different types and conditions have strict charging current requirements. Based on current feedback regulation, the charging current can be precisely controlled to ensure safe and efficient charging of the battery. Voltage feedback cannot directly achieve this high-precision constant current control because the battery terminal voltage constantly changes during the charging process.

[0078] In the above embodiment, PI control is used to adjust the Boost duty cycle in real time so that the charging voltage and current can accurately track the set target values, ensuring that the charging process is carried out according to preset parameters, which helps to improve the consistency and reliability of charging. The charging power can also be dynamically adjusted according to the real-time status and charging needs of the battery, so that the charging device can charge at the optimal power in different charging stages, thereby shortening the charging time, improving the charging efficiency, and providing users with a more convenient charging experience.

[0079] The vehicle charging control method also includes: stopping boost charging under preset stop conditions; wherein the preset stop conditions include at least one of the following: the absolute value of the difference between the demand current CurDemand and the feedback current CurFdb is greater than or equal to a first preset threshold; the difference between the battery voltage UdcBat and the demand voltage VoltDemand is less than or equal to a third preset threshold; the difference between the maximum voltage Umax of the charging pile and the feedback voltage VoltFdb is less than or equal to the third preset threshold.

[0080] For example, the voltage boost is stopped if any one of the following conditions is met: |CurDemand-CurFdb|>5A; UdcBat-VoltDemand<20V; Umax-VoltFdb<20V. The first preset threshold is 5A and the third preset threshold is 20V, which is not a specific limitation.

[0081] If one of the above conditions is met, the charging pile voltage boost is stopped, and charging continues according to the charging pile input voltage at the time of stopping until the charging request is completed.

[0082] In the above embodiment, when one of the preset conditions is met, boost charging is stopped, which is beneficial to protecting the battery, extending the battery life, avoiding energy loss, preventing circuit failure, and ensuring safe and stable operation of the charging system.

[0083] The following is an example of a specific application. For a certain vehicle model with a SOC of 10%, the battery pack voltage (battery voltage UdcBat) is 640V. The charging pile specification is 200V-750V, with a maximum current of 200A. Charging is performed according to the handshake voltage. The charging power = 620V * 200A = 124kW (620V is the demand voltage VoltDemand). When charging according to this solution, the charging power is adjusted according to the actual SOC change:

[0084] SOC 10% (battery pack voltage 640V) corresponding charging power = 620V * 200A = 124Kw;

[0085] Charging power for SOC 20% (battery pack voltage 660V) = 640V * 200A = 128kW;

[0086] Charging power for SOC 30% (battery pack voltage 680V) = 660V*200A = 132kW;

[0087] Charging power for SOC 40% (battery pack voltage 700V) = 680V * 200A = 136kW;

[0088] Charging power for SOC 50% (battery pack voltage 720V) = 700V * 200A = 140kW;

[0089] The charging power corresponding to SOC 60% (battery pack voltage 740V) = 730V * 200A = 146kW; (the charging pile capacity limit has been reached). At this time, the boost charging end condition UdcBat - VoltDemand < 20V is met, the charging pile stops continuing to boost the voltage, and normal charging begins.

[0090] The charging power corresponding to SOC 80% (battery pack voltage 780V) = 730V * 200A = 146kW; (the charging pile capacity limit has been reached). At this time, charging is carried out according to the charging pile capacity limit until the charging request is completed.

[0091] The vehicle charging control method proposed in this invention monitors the charging pile's capacity and the battery's permitted boost charging conditions in real time during the charging pile's output process, determining whether the charging pile has the potential to increase power. During the boost charging process, the Boost duty cycle is dynamically adjusted based on the charging pile's actual capacity to increase the charging pile's output voltage to meet the maximum power charging requirement. This method improves the charging pile's output power, shortens charging time, reduces subsequent user waiting time, and improves the charging pile's operational efficiency. Furthermore, the increased charging pile output voltage further improves charging efficiency, reducing user charging costs.

[0092] Figure 5 This is a block diagram of a vehicle charging control device provided in another embodiment of the present application.

[0093] This specification provides a vehicle charging control device 500. Figure 5 The vehicle charging control device 500 includes: a first sending module 510 , a receiving module 520 , a determining module 530 , and a second sending module 540 .

[0094] Exemplarily, the sending module 510 is used to send a charging request signal to the charging pile;

[0095] Exemplarily, the receiving module 520 is configured to charge the power battery of the vehicle based on the charging pile input voltage signal when receiving the charging pile input voltage signal provided by the charging pile in response to the charging request signal;

[0096] Exemplarily, the determination module 530 is configured to determine whether the charging pile is capable of boost charging the power battery based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile, and the input voltage signal of the charging pile;

[0097] Exemplarily, the second sending module 540 is configured to send a boost charging request to the charging pile when it is determined that the charging pile is capable of boost charging the power battery.

[0098] Exemplarily, the determination module 530 is also used to: determine the duty cycle based on the voltage signal of the power battery and the input voltage signal of the charging pile; when the duty cycle meets the first preset condition, determine whether the charging pile is capable of boosting and charging the power battery based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal.

[0099] Exemplarily, the voltage signal of the power battery includes the battery voltage, the maximum output voltage signal of the charging pile includes the maximum output voltage of the charging pile, the charging feedback signal includes the feedback current and the feedback voltage, and the charging request signal includes the demand voltage and the demand current; based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal, it is determined whether the charging pile is capable of boost charging the power battery, including: within the preset time, the demand current and the feedback current meet the second preset condition, and the maximum output voltage, demand voltage, feedback voltage and battery voltage of the charging pile meet the third preset condition, then it is determined that the charging pile is capable of boost charging the power battery.

[0100] Exemplarily, within the preset time, the demand current and the feedback current satisfy the second preset condition, including: within the preset time, the absolute value of the difference between the demand current and the feedback current is less than a first preset threshold, and the feedback current is greater than a second preset threshold.

[0101] Exemplarily, the maximum output voltage, required voltage, feedback voltage, and battery voltage of the charging pile meet a third preset condition, including: the difference between the maximum output voltage of the charging pile and the required voltage is greater than a third preset threshold, and the difference between the battery voltage and the feedback voltage is greater than the third preset threshold.

[0102] Exemplarily, the vehicle charging control method further includes: adjusting a duty cycle of the charging feedback signal based on the charging request signal.

[0103] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase B. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the feedback current of phase B; adjusting the duty cycle of the lower bridge of phase B based on the correction amount and the feedback current of phase B.

[0104] Exemplarily, the duty cycle includes the duty cycle of the lower bridge of phase C. Based on the charging request signal, adjusting the duty cycle of the charging feedback signal includes: performing PI control based on the feedback current and the demand current to obtain a correction amount, and collecting the C-phase feedback current; adjusting the duty cycle of the lower bridge of phase C based on the correction amount and the C-phase feedback current.

[0105] Exemplarily, the vehicle charging control device 500 also includes: a stop module, which is used to stop the charging pile from continuing to boost the voltage under preset stop conditions; wherein the preset stop conditions include at least one of the following: the absolute value of the difference between the demand current and the feedback current is greater than or equal to a first preset threshold; the difference between the battery voltage and the demand voltage is less than or equal to a third preset threshold; the difference between the maximum output voltage of the charging pile and the feedback voltage is less than or equal to the third preset threshold.

[0106] It can be understood that the specific implementation process of the vehicle charging control device 500 can refer to the implementation process of the vehicle charging control method above, and will not be repeated here.

[0107] Another embodiment of the present application provides a vehicle, including a controller and a battery system, wherein the controller includes a boost module, and the controller is used to implement the steps of the method of any of the above embodiments.

[0108] Figure 6 A block diagram of an electronic device provided in accordance with another embodiment of the present application.

[0109] Another embodiment of the present application provides an electronic device having a computer program stored thereon, which implements the steps of the method of any of the above embodiments when the computer program is executed by a processor.

[0110] like Figure 6 As shown, for ease of understanding, the embodiment of the present application shows a specific electronic device 600.

[0111] The electronic device 600 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are intended to be examples only and are not intended to limit implementations of the present disclosure described and / or claimed herein.

[0112] like Figure 6 As shown, the device 600 includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. Various programs and data required for the operation of the electronic device 600 can also be stored in the RAM 603. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0113] Multiple components in the electronic device 600 are connected to the I / O interface 605, including an input unit 606, such as a keyboard, a mouse, etc.; an output unit 607, such as various types of displays, speakers, etc.; a storage unit 608, such as a magnetic disk, an optical disk, etc.; and a communication unit 609, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 609 allows the electronic device 600 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0114] The computing unit 601 can be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 601 performs the various methods described above. For example, in some embodiments, any one or more of the above-described methods can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 608. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 600 via the ROM 602 and / or the communication unit 609. When the computer program is loaded into the RAM 603 and executed by the computing unit 601, one or more steps of any one or more of the various methods described above can be performed. Alternatively, in other embodiments, the computing unit 601 can be configured to perform any one or more of the above-described methods by any other appropriate means (e.g., by means of firmware).

[0115] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method in any one of the above embodiments are implemented.

[0116] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device, or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device, or apparatus and execute the instructions), or in conjunction with such instruction execution systems, devices, or apparatuses. For purposes of this application, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, device, or apparatus, or in conjunction with such instruction execution systems, devices, or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing it in a suitable manner if necessary, and then storing it in a computer memory.

[0117] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0118] In the description of this application, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0119] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0120] In addition, the terms "first" and "second" used in the embodiments of the present application are for descriptive purposes only and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined in the embodiments of the present application by terms such as "first" and "second" can explicitly or implicitly indicate that at least one of the features is included in the embodiment. In the description of the present application, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0121] In this application, unless otherwise specified or limited in the embodiments, the terms "installed", "connected", "connected", and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two elements, or the interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood based on the specific implementation.

[0122] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0123] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A vehicle charging control method, characterized in that: The method comprises: Sending a charging request signal to the charging pile; Upon receiving a charging pile input voltage signal provided by the charging pile in response to the charging request signal, charging the power battery of the vehicle based on the charging pile input voltage signal; Determining whether the charging pile is capable of boost charging the power battery based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile, and the input voltage signal of the charging pile; When it is determined that the charging pile is capable of boost charging the power battery, a boost charging request is sent to the charging pile.

2. The method according to claim 1, characterized in that The determining whether the charging pile is capable of boosting and charging the power battery based on the voltage signal of the power battery, the charging feedback signal during the power battery charging process, the charging request signal, the maximum output voltage signal of the charging pile, and the input voltage signal of the charging pile includes: Determine the duty cycle based on the voltage signal of the power battery and the input voltage signal of the charging pile; When the duty cycle meets a first preset condition, it is determined whether the charging pile is capable of boost charging the power battery based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal and the charging feedback signal.

3. The method according to claim 2, characterized in that The voltage signal of the power battery includes the battery voltage, the maximum output voltage signal of the charging pile includes the maximum output voltage of the charging pile, the charging feedback signal includes the feedback current and the feedback voltage, and the charging request signal includes the required voltage and the required current; and determining whether the charging pile is capable of boosting and charging the power battery based on the voltage signal of the power battery, the maximum output voltage signal of the charging pile, the charging request signal, and the charging feedback signal includes: Within the preset time, if the demand current and feedback current meet the second preset condition, and the charging pile's maximum output voltage, demand voltage, feedback voltage, and battery voltage meet the third preset condition, it is determined that the charging pile is capable of boosting and charging the power battery.

4. The method according to claim 3, characterized in that The demand current and the feedback current satisfying the second preset condition within the preset time include: Within a preset time, the absolute value of the difference between the demand current and the feedback current is smaller than a first preset threshold, and the feedback current is greater than a second preset threshold.

5. The method according to claim 3, characterized in that The maximum output voltage, required voltage, feedback voltage, and battery voltage of the charging pile meet a third preset condition, including: The difference between the maximum output voltage of the charging pile and the required voltage is greater than a third preset threshold, and the difference between the battery voltage and the feedback voltage is greater than the third preset threshold.

6. The method according to any one of claims 3 to 5, characterized in that The method further comprises: Based on the charging request signal, a duty cycle of the charging feedback signal is adjusted.

7. The method according to claim 6, characterized in that The duty cycle includes the duty cycle of the lower bridge of phase B, and the step of adjusting the duty cycle of the charging feedback signal based on the charging request signal includes: Perform PI control based on the feedback current and demand current to obtain the correction value and collect the B-phase feedback current; Based on the correction amount and the B-phase feedback current, the duty cycle of the B-phase lower bridge is adjusted.

8. The method according to claim 6, characterized in that The duty cycle includes a C-phase lower bridge duty cycle, and adjusting the duty cycle of the charging feedback signal based on the charging request signal includes: Perform PI control based on the feedback current and demand current to obtain the correction value and collect the C-phase feedback current; Based on the correction amount and the C-phase feedback current, the duty cycle of the C-phase lower bridge is adjusted.

9. The method according to any one of claims 3 to 8, characterized in that The method further includes: stopping the charging pile from continuing to boost the voltage under a preset stop condition; wherein the preset stop condition includes at least one of the following: The absolute value of the difference between the demand current and the feedback current is greater than or equal to a first preset threshold; The difference between the battery voltage and the required voltage is less than or equal to a third preset threshold; The difference between the maximum output voltage of the charging pile and the feedback voltage is less than or equal to a third preset threshold.

10. A vehicle charging control device, characterized in that: The device comprises: A first sending module, configured to send a charging request signal to a charging pile; a receiving module, configured to charge the power battery of the vehicle based on the charging pile input voltage signal when receiving the charging pile input voltage signal provided by the charging pile in response to the charging request signal; a determination module, configured to determine whether the charging pile is capable of boost charging the power battery based on a voltage signal of the power battery, a charging feedback signal during charging of the power battery, the charging request signal, a maximum output voltage signal of the charging pile, and an input voltage signal of the charging pile; The second sending module is configured to send a boost charging request to the charging pile when it is determined that the charging pile is capable of boost charging the power battery.

11. A vehicle, characterized in that: The vehicle includes a controller and a battery system, the controller includes a boost module, and the controller is used to implement the method described in any one of claims 1 to 9.

12. An electronic device having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

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