Photovoltaic charging control method and system for vehicle

Abstract

The invention provides a photovoltaic charging control method and system for a vehicle, and the method comprises the steps: enabling a photovoltaic controller to be connected to a first communication network node in a battery management system controller, and enabling the photovoltaic controller to be isolated from a whole vehicle network architecture through the battery management system controller; when a battery management system controller receives a charging request sent by a photovoltaic controller through a first communication network, only the independent working system is awakened to start and execute a photovoltaic charging process, an awakening message is not sent to a whole vehicle network, and at least one part of other controllers except the independent working system of the whole vehicle is kept in a dormant state; therefore, the energy consumption is reduced, the photovoltaic power generation efficiency is improved, and the photovoltaic power generation power is maximally transmitted to the power battery.

Description

Technical Field

[0001] This application relates to the field of vehicle charging technology, and in particular to a photovoltaic charging control method and system for vehicles. Background Technology

[0002] Solar energy, as a clean energy source, converts solar energy into electrical energy through solar photovoltaic modules, and has wide application value in various fields. For example, in the automotive industry, photovoltaic power generation systems are integrated into vehicles, and the electrical energy converted by the photovoltaic system is transmitted to charge the vehicle's power battery, thereby directly providing power for the vehicle's operation.

[0003] However, existing photovoltaic charging logic has an energy consumption contradiction: when the vehicle is under high voltage, the photovoltaic controller can interact with the vehicle controller normally and generate electricity for charging, but in this state, all vehicle controllers are in working state, resulting in high energy consumption; when the vehicle is powered off, the vehicle controller enters a sleep state to reduce energy consumption, but at this time, due to the lack of necessary signal interaction and control logic support, the photovoltaic system cannot charge the power battery; if all vehicle controllers are woken up to achieve charging, the power consumption of the vehicle will increase sharply, and the photovoltaic power generation will be greatly lost during the transmission to the power battery, which will seriously reduce the photovoltaic charging efficiency.

[0004] Therefore, in the field of vehicle photovoltaic charging technology, how to solve the problems of energy consumption and efficiency of whole vehicle photovoltaic charging has become an urgent technical challenge. Summary of the Invention

[0005] To overcome the problems existing in related technologies, this specification provides a photovoltaic charging control method and system for vehicles.

[0006] In a first aspect, a photovoltaic charging control system for a vehicle is provided, the system including a photovoltaic controller and a battery management system controller, the photovoltaic controller being communicatively connected to a first communication network governed by the battery management system controller, the battery management system controller also being connected to a second communication network of the vehicle, the first communication network being isolated from the second communication network; The battery management system controller is configured to: upon receiving a charging request sent by the photovoltaic controller through a first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, control the battery management system itself and the photovoltaic controller to maintain a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller, and communicate and interact with the photovoltaic controller through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

[0007] According to a photovoltaic charging control system for a vehicle provided in this application, if the battery management system controller is used to keep at least a portion of the other controllers in the vehicle, excluding the battery management system controller, in a dormant state, the battery management system controller is configured to: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

[0008] According to a photovoltaic charging control system for a vehicle provided in this application, the battery management system controller is further configured to: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle will not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, will enter a dormant state.

[0009] According to a photovoltaic charging control system for a vehicle provided in this application, the battery management system controller is further configured to: After receiving a charging request sent by the photovoltaic controller through the first communication network, before the battery management system and the photovoltaic controller are kept in a powered-on state, the system determines whether the charging conditions are met based on the state of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

[0010] According to the photovoltaic charging control system for a vehicle provided in this application, if the battery management system controller is used to control the photovoltaic controller to start and execute the photovoltaic charging process, the battery management system controller is further configured to: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

[0011] According to the present application, a photovoltaic charging control system for a vehicle is provided, wherein the photovoltaic controller is connected to the vehicle's charging wake-up line via a hard-wired wake-up signal, and the charging wake-up line is connected to the battery management system controller; or, The battery management system controller is equipped with a hardware wake-up pin, and the photovoltaic controller is connected to the hardware wake-up pin via a hard-wired wake-up signal; wherein, the hardware wake-up pin is different from the pin connected to the battery management system controller by the vehicle's charging wake-up line.

[0012] According to a photovoltaic charging control system for a vehicle provided in this application, the photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal, and the battery management system controller is further configured to: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

[0013] In a second aspect, a photovoltaic charging control method for a vehicle is provided, applied to the photovoltaic charging control system for a vehicle described in the first aspect, the method comprising: When a charging request is received from the photovoltaic controller via the first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, the battery management system itself and the photovoltaic controller are kept in a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller. The system communicates and interacts with the photovoltaic controller through the first communication network, controlling the photovoltaic controller to start and execute the photovoltaic charging process.

[0014] According to the photovoltaic charging control method for a vehicle provided in this application, the step of keeping at least a portion of the other controllers of the vehicle, excluding the battery management system controller, in a dormant state includes: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

[0015] According to the photovoltaic charging control method for a vehicle provided in this application, the step of keeping at least a portion of the other controllers of the vehicle, excluding the battery management system controller, in a dormant state includes: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle will not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, will enter a dormant state.

[0016] According to the photovoltaic charging control method for a vehicle provided in this application, after receiving a charging request sent by the photovoltaic controller through a first communication network, before controlling the battery management system itself and the photovoltaic controller to maintain a powered-on operating state, the method further includes: Determine whether the charging conditions are met based on the status of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

[0017] According to the photovoltaic charging control method for a vehicle provided in this application, after controlling the photovoltaic controller to start and execute the photovoltaic charging process, the method further includes: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

[0018] According to the photovoltaic charging control method for a vehicle provided in this application, the photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal. Before receiving a charging request sent by the photovoltaic controller through a first communication network, the method further includes: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

[0019] According to the photovoltaic charging control method for vehicles provided in this application, determining the current wake-up type based on the fast charging gun signal and the slow charging gun signal includes: If the fast charging gun signal is received at the same time, the current wake-up type is determined to be fast charging wake-up, and the preset fast charging strategy is executed. If the slow charging gun signal is received at the same time, the current wake-up type is determined to be slow charging wake-up, and the preset slow charging strategy is executed. If neither the fast charging gun signal nor the slow charging gun signal is received, the current wake-up type is determined to be photovoltaic controller wake-up.

[0020] Thirdly, a battery management system controller for a vehicle is provided, which implements the photovoltaic charging control method for a vehicle as described in the second aspect above.

[0021] Fourthly, a computer-readable storage medium is provided, wherein a photovoltaic charging control program for a vehicle is stored thereon, wherein the photovoltaic charging control program for a vehicle, when executed, implements the steps of any of the photovoltaic charging control methods for a vehicle as described above.

[0022] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the photovoltaic charging control method for a vehicle as described in any of the above.

[0023] This application provides a photovoltaic charging control method and system for vehicles, which has the following advantages compared with the current photovoltaic charging methods for vehicles, which suffer from high energy consumption and low efficiency: On the one hand, the network architecture that connects the photovoltaic controller to the first communication network node inside the BMS isolates the photovoltaic controller from the vehicle network architecture using the BMS, thus avoiding interference from the photovoltaic controller to the vehicle network architecture when the photovoltaic is installed later.

[0024] On the other hand, an independent operating system consisting of a photovoltaic system and a battery management system is formed. This independent operating system can independently control the start and stop of photovoltaic charging without interfering with the status of other controllers in the vehicle. When a charging request is received from the photovoltaic controller through the first communication network, only the independent operating system is awakened to start and execute the photovoltaic charging process. No wake-up message is sent to the vehicle network, keeping at least some of the other controllers in the vehicle in a dormant state, thereby reducing energy consumption, improving photovoltaic power generation efficiency, and maximizing the transmission of photovoltaic power to the power battery.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0027] Figure 1This is a schematic diagram illustrating the structure of a photovoltaic charging control system for a vehicle according to an exemplary embodiment of this specification; Figure 2 This is a diagram illustrating the vehicle network architecture after connecting to the photovoltaic controller, according to an exemplary embodiment of this specification; Figure 3 This is a schematic diagram illustrating the wake-up signal connection between the battery management system controller and the photovoltaic controller according to an exemplary embodiment of this specification; Figure 4 This is a schematic flowchart illustrating a photovoltaic charging control method for a vehicle according to an exemplary embodiment of this specification; Figure 5 This is a schematic block diagram illustrating a photovoltaic charging control device for a vehicle according to an exemplary embodiment. Detailed Implementation

[0028] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0030] This application provides a photovoltaic charging control method and system for vehicles. The following detailed description, in conjunction with the accompanying drawings, illustrates this application. The features described in the embodiments and implementations can be combined with each other.

[0031] In the field of vehicle photovoltaic charging, existing photovoltaic charging logic has an energy consumption contradiction: when the vehicle is under high voltage, the photovoltaic controller can interact with the vehicle controller normally and generate electricity for charging. However, in this state, all vehicle controllers are in working condition, resulting in high energy consumption. When the vehicle is powered off, the vehicle controller enters a sleep state to reduce energy consumption. At this time, due to the lack of necessary signal interaction and control logic support, the photovoltaic system cannot charge the power battery. If all vehicle controllers are woken up to achieve charging, the power consumption of the vehicle will increase sharply, resulting in a significant increase in the loss of photovoltaic power generation during the transmission to the power battery, which seriously reduces the photovoltaic charging efficiency.

[0032] To address the aforementioned technical problems, this specification provides a photovoltaic charging control method for vehicles.

[0033] The aim is to connect the photovoltaic controller to a node in the internal communication network of the vehicle's battery management system, physically and logically isolating it from the vehicle's main network. This forms an independent operating system comprised of the photovoltaic system and the battery management system. This independent operating system can independently control the start and stop of photovoltaic charging without interfering with the state of other controllers in the vehicle. For example, when the vehicle is powered off and the engine is off, the vehicle controllers enter a sleep state. If photovoltaic charging is needed at this time, only this independent operating system is awakened to start and execute the photovoltaic charging process, without sending a wake-up message to the vehicle network. This keeps at least some of the other controllers in the vehicle, except for the independent operating system, in a sleep state, thereby reducing energy consumption and improving photovoltaic power generation efficiency.

[0034] It should be noted that an independent operating system refers to a minimal, independent closed-loop control system formed by the BMS controller and the photovoltaic controller, and is not a newly added functional system for the vehicle. Of course, this operating system may also include a DC / DC converter associated with the photovoltaic controller for power generation.

[0035] Figure 1 This is a schematic diagram of the structure of a photovoltaic charging control system for a vehicle provided in one embodiment of this application.

[0036] See Figure 1 The photovoltaic charging control system for vehicles (hereinafter referred to as the photovoltaic charging control system) includes a photovoltaic system and a battery management system (BMS). The photovoltaic system includes a photovoltaic controller and a bidirectional DC / DC converter. The bidirectional DC / DC converter is a key device for realizing the "low-voltage to high-voltage" conversion and integration into the vehicle's network. The photovoltaic controller executes the MPPT algorithm to maximize the extraction of electrical energy from the solar panels and boosts the voltage through the DC / DC converter. The electrical energy is directly output from the DC / DC converter to the positive and negative buses of the vehicle's high-voltage power battery, completing the charging process.

[0037] The battery management system includes a battery management system controller, which controls the start and stop of the photovoltaic controller.

[0038] In some embodiments, the photovoltaic charging control system includes a photovoltaic controller and a battery management system controller. The photovoltaic controller is communicatively connected to a first communication network governed by the battery management system controller. The battery management system controller is also connected to a second communication network of the vehicle. The first communication network is isolated from the second communication network.

[0039] In the field of vehicle photovoltaic charging technology, photovoltaic systems are often retrofitted onto qualified vehicles that have already rolled off the production line. Since this retrofitting process requires adding network nodes such as photovoltaic controllers to the vehicle's existing network architecture, it can easily interfere with the vehicle's original communication network, affecting the vehicle's normal functions, such as causing network signal conflicts and erroneous control command triggering.

[0040] The first communication network mentioned in this article refers to the internal communication network dominated by the BMS, while the second communication network refers to the vehicle's backbone network, which can also be understood as the vehicle's original network architecture. The first communication network can be, but is not limited to, the internal CAN bus. The second communication network can be, but is not limited to, the powertrain CAN bus, the body CAN bus, etc.

[0041] Reference Figure 2 , Figure 2 This is a diagram of the vehicle network architecture after the photovoltaic controller is connected. The BMS controller, as a node in the vehicle's powertrain CAN network architecture, communicates normally with other controllers before the photovoltaic controller is installed; however, photovoltaic controller messages are not forwarded to the vehicle's powertrain CAN network. After the vehicle leaves the factory, the photovoltaic controller's communication is connected to the first communication network managed by the BMS controller, instead of directly connecting to the vehicle's second communication network. This allows the BMS controller to forward the photovoltaic controller's signals, thus enabling information exchange between the photovoltaic controller and the vehicle's CAN network.

[0042] In this network architecture, the BMS is used to isolate the photovoltaic controller from the vehicle network architecture. The communication between the photovoltaic controller and other controllers in the vehicle is forwarded through the BMS, which avoids interference from the photovoltaic controller to the vehicle network architecture, such as potential message conflicts, when the photovoltaic system is installed later.

[0043] In some embodiments, the BMS forwards signals from the photovoltaic controller, such as real-time charging power and cumulative power generation, to the instrument, and then displays this information to the user through the instrument.

[0044] Based on the vehicle network architecture after the photovoltaic controller is connected as described above, the battery management system controller is configured to: when receiving a charging request sent by the photovoltaic controller through the first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, control the battery management system itself and the photovoltaic controller to maintain a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller, and communicate and interact with the photovoltaic controller through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

[0045] Based on the above vehicle network architecture, when the BMS controller receives a charging request from the photovoltaic controller, it can control only the battery management system itself and the photovoltaic controller to remain in a powered-on state. Since the system formed by the two can work independently, at least some of the other controllers in the vehicle, except for the battery management system controller, can normally enter a sleep state without affecting the photovoltaic charging process.

[0046] In some embodiments, there are several ways to keep at least some of the controllers in the vehicle other than the battery management system controller in a dormant state.

[0047] Example 1: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

[0048] The wake-up process described in this article refers to the occurrence of an event or signal that causes one or more controllers to transition from a sleep state to a normal operating state.

[0049] Specifically, the vehicle's power-off state can be determined by the vehicle's ignition signal. When the vehicle's ignition signal is "OFF," it indicates that the vehicle is in a power-off state. At this time, if the photovoltaic controller is detected to have power generation capability, the BMS will only autonomously wake up itself and the photovoltaic system without sending a wake-up message to the vehicle network. In this way, most controllers, such as the VCU and motor controller, remain in a low-power sleep state, while photovoltaic charging proceeds normally, effectively improving charging efficiency.

[0050] Example 2: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle does not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, enter a dormant state.

[0051] Specifically, the vehicle's power-on state can also be determined by the vehicle's ignition signal. The vehicle's ignition signal is "ON," indicating that the vehicle is powered on. When a power-off command is received, if the photovoltaic controller is detected to have power generation capability or the photovoltaic system is in power generation mode, the BMS will not respond to the normal power-off command, maintaining a high-voltage state to ensure continuous charging of the power battery by the photovoltaic system. Meanwhile, at least some of the other controllers in the vehicle, besides the battery management system controller, will respond normally to the vehicle's power-off command. Thus, most controllers, such as the VCU and motor controller, remain in a low-power sleep state, and photovoltaic charging continues normally, effectively improving charging efficiency.

[0052] In addition to photovoltaic charging, the vehicle also uses its original charging methods, such as fast charging and slow charging. Fast charging uses a fast charging gun to charge the battery; a fast charging wake-up signal is generated when a DC charging gun is detected connected. Slow charging uses a slow charging gun to charge the battery; a slow charging signal is generated when an AC charging gun is detected connected. Therefore, there are three wake-up methods in the vehicle: fast charging wake-up, slow charging wake-up, and photovoltaic wake-up (also known as photovoltaic controller wake-up). Different wake-up methods result in different BMS response strategies to vehicle power-down commands and different charging processes for the battery.

[0053] Regarding the command response strategy for powering down the entire vehicle: When the vehicle is powered down, if only fast charging or slow charging wake-up exists in the system (i.e., the photovoltaic system is not installed or the photovoltaic system is not working), the BMS's response strategy is standard. The BMS will keep the high-voltage relay closed and continue charging. Once the user unplugs the charging gun (fast charging / slow charging wake-up disappears), the BMS will immediately respond to the previously received vehicle power-down command, disconnect the high-voltage relay, and then enter sleep mode itself. At this time, the vehicle's high-voltage system is completely powered down, energy consumption is minimized, and the system is safe.

[0054] When the vehicle is turned off, the vehicle sends a power-down command. The BMS detects a photovoltaic wake-up (and possibly fast or slow charging wake-up simultaneously). Even if fast or slow charging is completed and the charging gun is disconnected (the fast / slow charging wake-up disappears), the BMS will not respond to the vehicle power-down command. The BMS will maintain the high-voltage relay in a closed state, thus maintaining an active high-voltage circuit. This allows the electricity generated by the photovoltaic system to continuously charge the battery. This enables the vehicle to continue charging the battery using solar energy even when the engine is off and the vehicle is locked, maximizing energy harvesting. Finally, when the photovoltaic wake-up also disappears (e.g., due to reduced sunlight, or the photovoltaic controller's output voltage / power falling below the operating threshold), the BMS detects that all wake-up sources are no longer present. Only then will it finally execute the long-delayed vehicle power-down command, disconnect the high voltage, and enter sleep mode.

[0055] As can be seen from the above logic for responding to the vehicle power-down command, the BMS comprehensively judges the status of all wake-up sources and identifies the photovoltaic charging status when the vehicle is powered off, thereby making the most energy-efficient decision. In this logic, the continuity of "photovoltaic wake-up" is given a higher priority than "executing the power-down command," which not only ensures the normal power generation function of the photovoltaic system but also maximizes the utilization of available photovoltaic power and improves photovoltaic charging efficiency.

[0056] Regarding the charging process of power batteries: The BMS identifies three wake-up scenarios: fast charging wake-up, slow charging wake-up, and photovoltaic wake-up. For fast charging and slow charging wake-up, it wakes up other controllers according to the normal procedure and executes the power battery charging process. For photovoltaic wake-up, the BMS controller communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

[0057] In some embodiments, the wake-up hardwire of the photovoltaic controller can be connected to the BMS in two ways.

[0058] In one method, the photovoltaic controller is connected to the vehicle's charging wake-up line via a hard-wired wake-up signal, and the charging wake-up line is connected to the battery management system controller.

[0059] Reference Figure 3 The photovoltaic controller is woken up by connecting its hard wire to the charging wake-up hard wire. This allows the BMS to be woken up through the same hard wire, and then the specific wake-up source can be determined based on other signals (fast charging gun, slow charging gun).

[0060] This line reuse approach greatly simplifies the installation process for the aftermarket. Installers no longer need to find complex dedicated interfaces or develop a separate wake-up harness to the BMS; they only need to connect the photovoltaic controller's wake-up line to the existing, well-defined charging wake-up line, saving hardware costs and space. Furthermore, the wake-up type is determined by the BMS's software logic, not a fixed hardware connection. This makes the system highly flexible. Even if future charging standards change or the judgment logic needs adjustment, it can be achieved primarily through software upgrades (OTA or flashing), without requiring hardware modifications.

[0061] Method 2: The battery management system controller is equipped with a hardware wake-up pin, and the photovoltaic controller is connected to the hardware wake-up pin via a hard-wired wake-up signal; wherein, the hardware wake-up pin is different from the pin connected to the battery management system controller by the vehicle's charging wake-up line.

[0062] Instead of directly connecting the photovoltaic controller's hardwired wake-up to the charging wake-up hardwired line, a separate wake-up hardwired line is designed for the photovoltaic controller, directly connected to a dedicated wake-up pin of the BMS. This way, when the photovoltaic controller detects sufficient light, it sends a wake-up signal to the BMS via this hardwired line.

[0063] Compared to hard-wire multiplexing, the BMS can distinguish wake-up sources (i.e., fast charging wake-up, slow charging wake-up, and photovoltaic wake-up) through independent hard-wire wake-up signals, avoiding misjudgments. Simultaneously, photovoltaic wake-up can be controlled independently, achieving minimal system wake-up and maximizing charging efficiency. Furthermore, it facilitates retrofitting because the photovoltaic controller has an independent wake-up line, avoiding interference with the existing charging system, thus offering simplicity and reliability. However, this method requires the BMS to reserve a dedicated wake-up pin; for BMSs without this reserved pin, hardware modifications may be necessary.

[0064] The choice between the two photovoltaic controller installation methods mentioned above depends on the user's actual needs, and can be made based on factors such as ease of use and BMS hardware configuration.

[0065] In some embodiments, the photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal, and the battery management system controller is further configured to: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

[0066] There are three wake-up sources for the BMS controller: fast charging wake-up, slow charging wake-up, and photovoltaic wake-up. They share the same hard-wired wake-up line, and the BMS distinguishes between them by detecting the presence of fast charging or slow charging gun signals. It should be noted that fast charging and slow charging gun signals are mutually exclusive; that is, fast charging and slow charging gun signals cannot exist simultaneously.

[0067] In some cases, when a hard-wired wake-up occurs and a fast or slow charging signal is detected simultaneously, even if a photovoltaic (PV) wake-up also occurs (i.e., the PV controller also initiates a hard-wired wake-up), the BMS will prioritize the fast or slow charging wake-up. This is because fast and slow charging are user-initiated actions, typically requiring immediate charging and higher power output. PV charging, on the other hand, is automatic and has relatively lower power. Therefore, from a safety and charging power perspective, fast and slow charging usually have higher priority than PV charging. Clearly defining priorities avoids logical conflicts and ensures system stability.

[0068] The specific wake-up logic is as follows: The BMS detects a hard-wired wake-up signal (i.e., the wake-up line is pulled high). The BMS checks the fast charging and slow charging plug-in signals: if a fast charging plug-in signal is detected, it is determined to be a fast charging wake-up, the fast charging process is executed, and necessary network nodes (such as VCU, meters, etc.) are woken up. If a slow charging plug-in signal is detected, it is determined to be a slow charging wake-up, the slow charging process is executed, and necessary network nodes are woken up. If there is neither a fast charging nor a slow charging plug-in signal, it is determined to be a photovoltaic wake-up, the photovoltaic charging process is executed, and only the BMS and photovoltaic controller are woken up, without waking up other network nodes, in order to achieve low-power charging.

[0069] This prioritization ensures that user-initiated charging requests (fast charging / slow charging) are responded to immediately, while photovoltaic charging is performed automatically when there are no user charging requests, thus avoiding conflicts between photovoltaic charging and user charging.

[0070] When the wake-up type is photovoltaic wake-up, the BMS monitors the first communication network. If the photovoltaic controller sends a charging request through the first communication network, it will be received in time. Then, it executes the photovoltaic charging process by keeping at least some of the other controllers in the vehicle except the battery management system controller in a dormant state, controlling the battery management system itself and the photovoltaic controller to maintain a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller, and communicating and interacting with the photovoltaic controller through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

[0071] In some embodiments, if a change in charging status occurs during the charging process of the vehicle, the BMS controller re-determines the wake-up source and executes a new charging process according to the priority arbitration logic.

[0072] As an example, the BMS has been hard-wired awakened by the PV controller and, due to the absence of a plug-in signal, has determined it to be "PV wake-up," initiating PV charging. The BMS continuously monitors the plug-in signal; if the user plugs in a fast charging gun (or slow charging gun), it will immediately detect the presence of the fast charging plug-in signal. Because fast charging requires exclusive battery charging resources, or for safety reasons, mixed charging is not allowed, the BMS will send a "pause charging" or "enter standby" command to the PV controller. Subsequently, the BMS closes the fast charging circuit relay, initiating the fast charging process.

[0073] As an example, the BMS is woken up by the charging gun plugging in, classifying it as a "fast charge wake-up" / "slow charge wake-up," and begins charging. When the sun comes out, the photovoltaic controller detects sufficient sunlight and pulls the already high-level wake-up hardline back up (or keeps it high). Since the hardline wake-up signal already exists, the BMS does not re-evaluate the wake-up source. The BMS ignores any charging requests from the photovoltaic controller at this time, or directly replies "charging prohibited." Fast / slow charging continues until it ends. At the end of fast / slow charging, the BMS detects the plugging signal disappearing, but if the wake-up hardline is still high (the photovoltaic system is still requesting charging), it will re-evaluate it as a "photovoltaic wake-up" and may switch to photovoltaic charging mode.

[0074] By prioritizing battery charging resources through high-power charging channels, the system improves the efficient utilization of resources and avoids logical conflicts or system failures that may be caused by multiple charging sources attempting to control the BMS simultaneously.

[0075] Of course, regardless of whether the vehicle is powered on or off, when a charging request is received from the photovoltaic controller via the first communication network, the BMS will determine whether to allow the photovoltaic controller to charge based on the conditions of the power battery, prioritizing the safety of photovoltaic charging and battery life.

[0076] In some embodiments, the battery management system controller is further configured to: After receiving a charging request sent by the photovoltaic controller through the first communication network, before the battery management system and the photovoltaic controller are kept in a powered-on state, the system determines whether the charging conditions are met based on the state of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

[0077] The photovoltaic controller continuously monitors the light intensity. When the intensity exceeds a preset activation threshold (indicating power generation capability), it does not immediately charge the battery. Instead, the photovoltaic controller first sends a charging request command to the BMS. After receiving the charging request, the BMS determines whether the power battery meets the charging conditions. These charging conditions include, but are not limited to, battery state of charge, battery temperature, battery health status, and high-voltage circuit status.

[0078] If all conditions are met, the BMS sends a charging permission command to the photovoltaic controller. Only after receiving this explicit permission does the photovoltaic controller officially start the DC / DC converter and begin charging the battery. Simultaneously, the BMS executes the high-voltage application process without waking up other controllers.

[0079] If any condition is not met, the BMS can send a command to prohibit charging or not respond to a charging request. The photovoltaic controller will remain in standby mode or cease operation after the request times out or after receiving an explicit prohibition command.

[0080] If the ON signal of the whole vehicle is always present at this time, the BMS will continue to maintain the high voltage command regardless of whether the wake-up signal of the photovoltaic controller is present.

[0081] In some embodiments, if the battery management system controller is used to control the photovoltaic controller to start and execute the photovoltaic charging process, the battery management system controller is further configured to: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

[0082] During photovoltaic charging, the Battery Management System (BMS) continuously monitors various battery parameters. If the BMS detects any situation that does not meet charging conditions, including but not limited to the battery reaching full SOC, a sudden increase or decrease in battery temperature exceeding the safe charging window, or a new system fault (such as an insulation failure), the BMS will immediately and proactively send a stop-charging command to the photovoltaic controller. Upon receiving this command, the photovoltaic controller must unconditionally and immediately stop power output and disconnect the charging circuit to ensure battery safety.

[0083] Through the above process, the BMS determines the photovoltaic controller's power generation based on the conditions of the power battery itself, thus clarifying the signal interaction and control relationship between the BMS and the photovoltaic controller.

[0084] This application provides an embodiment of a photovoltaic charging control method for vehicles, referring to... Figure 4 , Figure 4 This is a schematic flowchart of a photovoltaic charging control method for a vehicle provided in the embodiments of this specification. It should be noted that the photovoltaic charging control method for a vehicle described in this application is applied to the battery management system controller in the photovoltaic charging control system of the vehicle.

[0085] Specifically, this includes the following steps 101 to 102: In step 101, when a charging request is received from the photovoltaic controller via the first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, the battery management system itself and the photovoltaic controller are kept in a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller. In step 102, the photovoltaic controller is communicated and interacted with through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

[0086] In some embodiments, keeping at least a portion of the other controllers in the vehicle, excluding the battery management system controller, in a dormant state includes: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

[0087] In some embodiments, keeping at least a portion of the other controllers in the vehicle, excluding the battery management system controller, in a dormant state includes: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle will not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, will enter a dormant state.

[0088] In some embodiments, after receiving a charging request sent by the photovoltaic controller through a first communication network, before controlling the battery management system itself and the photovoltaic controller to maintain a powered-on operating state, the method further includes: Determine whether the charging conditions are met based on the status of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

[0089] In some embodiments, after controlling the photovoltaic controller to start and execute the photovoltaic charging process, the method further includes: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

[0090] In some embodiments, the photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal, and the method further includes, prior to receiving a charging request sent by the photovoltaic controller via a first communication network: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

[0091] In some embodiments, determining the current wake-up type based on the fast charging gun signal and the slow charging gun signal includes: If the fast charging gun signal is received at the same time, the current wake-up type is determined to be fast charging wake-up, and the preset fast charging strategy is executed. If the slow charging gun signal is received at the same time, the current wake-up type is determined to be slow charging wake-up, and the preset slow charging strategy is executed. If neither the fast charging gun signal nor the slow charging gun signal is received, the current wake-up type is determined to be photovoltaic controller wake-up.

[0092] For a detailed description of the photovoltaic charging control method for vehicles, please refer to the relevant description of the battery management system controller in the photovoltaic charging control system for vehicles described above. The photovoltaic charging control method for vehicles has the same beneficial effects as the photovoltaic charging control system for vehicles, and will not be repeated here.

[0093] This application provides a photovoltaic charging control method and system for vehicles, which has the following advantages compared with the current photovoltaic charging methods for vehicles, which suffer from high energy consumption and low efficiency: On the one hand, the network architecture that connects the photovoltaic controller to the first communication network node inside the BMS isolates the photovoltaic controller from the vehicle network architecture using the BMS, thus avoiding interference from the photovoltaic controller to the vehicle network architecture when the photovoltaic is installed later.

[0094] On the other hand, an independent operating system consisting of a photovoltaic system and a battery management system is formed. This independent operating system can independently control the start and stop of photovoltaic charging without interfering with the status of other controllers in the vehicle. When a charging request is received from the photovoltaic controller through the first communication network, only the independent operating system is awakened to start and execute the photovoltaic charging process. No wake-up message is sent to the vehicle network, keeping at least some of the other controllers in the vehicle in a dormant state, thereby reducing energy consumption, improving photovoltaic power generation efficiency, and maximizing the transmission of photovoltaic power to the power battery.

[0095] Figure 5 An example is a schematic diagram of the physical structure of a photovoltaic charging control device for a vehicle, such as... Figure 5 As shown, the photovoltaic charging control device for vehicles may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logic instructions from the memory 830 to execute a photovoltaic charging control method for vehicles.

[0096] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0097] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the photovoltaic charging control method for vehicles provided by the above methods.

[0098] In another aspect, this application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the photovoltaic charging control method for a vehicle provided by the methods described above.

[0099] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A photovoltaic charging control system for vehicles, characterized in that, The system includes a photovoltaic controller and a battery management system controller. The photovoltaic controller is communicatively connected to a first communication network under the jurisdiction of the battery management system controller. The battery management system controller is also connected to a second communication network of the vehicle. The first communication network is isolated from the second communication network. The battery management system controller is configured to: upon receiving a charging request sent by the photovoltaic controller through a first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, control the battery management system itself and the photovoltaic controller to maintain a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller, and communicate and interact with the photovoltaic controller through the first communication network to control the photovoltaic controller to start and execute the photovoltaic charging process.

2. The photovoltaic charging control system for vehicles as described in claim 1, characterized in that, If the battery management system controller is used to keep at least some of the other controllers in the vehicle, excluding the battery management system controller, in a dormant state, the battery management system controller is configured to: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

3. The photovoltaic charging control system for vehicles as described in claim 1, characterized in that, The battery management system controller is also configured to: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle will not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, will enter a dormant state.

4. The photovoltaic charging control system for vehicles as described in claim 1, characterized in that, The battery management system controller is also configured to: After receiving a charging request sent by the photovoltaic controller through the first communication network, before the battery management system and the photovoltaic controller are kept in a powered-on state, the system determines whether the charging conditions are met based on the state of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

5. The photovoltaic charging control system for vehicles as described in claim 4, characterized in that, If the battery management system controller is used to control the photovoltaic controller to start and execute the photovoltaic charging process, the battery management system controller is further configured to: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

6. The photovoltaic charging control system for vehicles as described in claim 1, characterized in that, The photovoltaic controller is connected to the vehicle's charging wake-up line via a hard-wired wake-up signal, and the charging wake-up line is connected to the battery management system controller. or, The battery management system controller is equipped with a hardware wake-up pin, and the photovoltaic controller is connected to the hardware wake-up pin via a hard-wired wake-up signal; wherein, the hardware wake-up pin is different from the pin connected to the battery management system controller by the vehicle's charging wake-up line.

7. The photovoltaic charging control system for vehicles as described in claim 6, characterized in that, The photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal, and the battery management system controller is further configured to: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

8. A photovoltaic charging control method for vehicles, characterized in that, The method, applied to the photovoltaic charging control system for a vehicle as described in claim 1, comprises: When a charging request is received from the photovoltaic controller via the first communication network, while keeping at least a portion of the other controllers in the vehicle other than the battery management system controller in a dormant state, the battery management system itself and the photovoltaic controller are kept in a powered-on working state, forming an independent working system including the battery management system controller and the photovoltaic controller. The system communicates and interacts with the photovoltaic controller through the first communication network, controlling the photovoltaic controller to start and execute the photovoltaic charging process.

9. The photovoltaic charging control method for a vehicle as described in claim 8, characterized in that, Maintaining at least a portion of the vehicle's controllers other than the battery management system controller in a dormant state includes: When the vehicle is powered off, upon receiving a charging request from the photovoltaic controller via the first communication network, it does not send a wake-up signal to the second communication network, so as to keep at least some of the other controllers in the vehicle, except for the battery management system controller, in a dormant state.

10. The photovoltaic charging control method for a vehicle as described in claim 8, characterized in that, Maintaining at least a portion of the vehicle's controllers other than the battery management system controller in a dormant state includes: When the vehicle transitions from a powered-on state to a powered-off state, if a charging request is received from the photovoltaic controller, the vehicle will not respond to the vehicle power-off command that controls the transition from a powered-on state to a powered-off state, so that at least some of the other controllers in the vehicle, except for the battery management system controller, will enter a dormant state.

11. The photovoltaic charging control method for a vehicle as described in claim 8, characterized in that, After receiving a charging request sent by the photovoltaic controller through the first communication network, and before controlling the battery management system and the photovoltaic controller to maintain a powered-on operating state, the method further includes: Determine whether the charging conditions are met based on the status of the vehicle's power battery. When the charging conditions are met, the battery management system responds to the charging request and controls the battery management system and the photovoltaic controller to maintain the power-on working state.

12. The photovoltaic charging control method for a vehicle as described in claim 11, characterized in that, After controlling the photovoltaic controller to start and execute the photovoltaic charging process, the method further includes: During the photovoltaic charging process, the status of the power battery is monitored in real time; Based on the real-time monitoring results, determine whether the current charging conditions are met; If the charging conditions are not met, the system communicates with the photovoltaic controller through the first communication network to control the photovoltaic controller to stop the photovoltaic charging process.

13. The photovoltaic charging control method for a vehicle as described in claim 8, characterized in that, The photovoltaic controller is connected to the battery management system controller via a hard-wired wake-up signal. Before receiving a charging request sent by the photovoltaic controller through the first communication network, the method further includes: After receiving the hard-wire wake-up signal, detect the fast charging gun signal and the slow charging gun signal; Based on the reception status of the fast charging gun signal and the slow charging gun signal, determine the current wake-up type; When the wake-up type is photovoltaic controller wake-up, the first communication network is monitored, and the charging request sent by the photovoltaic controller through the first communication network is received.

14. The photovoltaic charging control method for a vehicle as described in claim 13, characterized in that, The step of determining the current wake-up type based on the fast charging gun signal and the slow charging gun signal includes: If the fast charging gun signal is received at the same time, the current wake-up type is determined to be fast charging wake-up, and the preset fast charging strategy is executed. If the slow charging gun signal is received at the same time, the current wake-up type is determined to be slow charging wake-up, and the preset slow charging strategy is executed. If neither the fast charging gun signal nor the slow charging gun signal is received, the current wake-up type is determined to be photovoltaic controller wake-up.

15. The photovoltaic charging control method for a vehicle as described in claim 8, characterized in that, Battery management system controller used in vehicles.

16. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a photovoltaic charging control program for a vehicle, which, when executed, implements the steps of the photovoltaic charging control method for a vehicle as described in any one of claims 8 to 14.

Images