Multi-gun shared charging control system and networking method thereof

Abstract

The application provides a multi-gun shared charging control system and a networking method thereof, the system comprising at least two charging guns, a shared SECC MCU, a shared PLC modem, a PLC signal conditioning network, and a PWM generation module, a control guide state detection circuit and a coupling and decoupling circuit independent of each gun; the shared PLC modem is connected with the coupling and decoupling circuits of each gun through the PLC signal conditioning network, forming a multi-gun shared PLC signal channel, and the shared SECC MCU maintains the communication context of each gun and establishes a correspondence relationship between the guns and the vehicles. The application reduces the repeated configuration of communication hardware and the interface expansion requirement by sharing the SECC MCU and the PLC modem of multiple guns, and realizes the multi-gun communication correspondence by the independent control guide and coupling branch and the PLC signal conditioning network of each gun, and adapts to the change of the PLC signal transmission condition caused by the multi-branch access.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and in particular to a multi-gun shared charging control system and its networking method. Background Technology

[0002] There are two types of communication mechanisms between electric vehicle charging stations and electric vehicles: control guidance communication and high-level digital communication. The 1kHz PWM signal specified in IEC 61851-1 is used for control guidance functions such as connection status indication, permitted current transmission, and high-level communication triggering. In DC fast charging scenarios, PWM is not suitable as the sole means of regulating DC output power. DC output voltage, current, and power are usually negotiated by high-level communication protocols such as ISO 15118 or DIN SPEC 70121 and then executed by the power module. PLC digital communication superimposes a high-frequency PLC signal (1.8MHz~30MHz) on the CP pin to achieve high-level communication functions such as charging parameter negotiation, authentication, and payment. These two mechanisms together constitute the existing CCS charging communication system.

[0003] In the European and American markets, typical high-power DC charging piles often adopt an architecture with an independent SECC (Supply Equipment Communication Controller) communication control module for each charging gun. The SECC is a communication control functional unit on the EVSE (Electric Vehicle Supply Equipment) side used to execute high-level charging communication protocols such as ISO 15118 and DIN SPEC 70121. The SECC communication control module in engineering products typically includes a SECC MCU for running the protocol stack and a PLC modem for implementing the HomePlug Green PHY physical layer communication. Each charging gun corresponds to a set of SECC MCU and PLC modem, and power coordination between guns is usually achieved via CAN or Ethernet. Relevant standards include the ISO 15118 series (ISO 15118-1~20), DIN SPEC 70121, and the HomePlug Green PHY specification.

[0004] Combination Figure 1 As shown, the publicly available information from major yaoq manufacturers mainly reflects a solution of independent SECC communication control module per gun or independent PLC modem per gun.

[0005] The existing technical solutions have the following four main problems: 1. Excessive hardware costs Each charging gun is independently configured with a SECC communication control module, and the hardware cost increases linearly with the number of guns. Each additional charging gun requires an additional SECC MCU, protocol stack runtime resources, and PLC modem, resulting in redundant configuration of protocol processing hardware and physical layer communication hardware.

[0006] 2. Lack of a multi-gun communication mechanism after sharing PLC resources. When multiple charging guns share the same PLC modem, SLAC broadcast messages and continuous communication messages from different vehicles converge to the same PLC interface. If the gun-vehicle correspondence cannot be established based on the control guidance status of each gun, HLC triggering timing, vehicle MAC address, RunID, and subsequent connection or session identifier, the shared SECC MCU will be unable to determine the charging gun to which the message belongs, and will also be unable to maintain the charging communication process of multiple vehicles simultaneously.

[0007] 3. The parallel connection of multiple gun paths causes changes in PLC signal transmission conditions. When multiple charging guns have their coupling / decoupling branches connected in parallel to the same PLC signal channel, changes in the number of online vehicles, the length of the charging gun wires, and the coupling parameters of each branch will alter the equivalent load of the shared port and may cause changes in the PLC signal amplitude and frequency response. Traditional independent PLC modem solutions for each charging gun do not have the problem of multiple branches sharing the same PLC port, and therefore lack a unified signal conditioning structure for shared PLC signal channels.

[0008] 4. The number of MCU interfaces limits the maximum number of charging guns. In traditional architectures with independent PLC modems for each charging gun, each PLC modem communicates with the main control MCU or SECC MCU via interfaces such as SPI. However, MCUs typically provide only a limited number of high-speed peripheral interfaces. If each charging gun is equipped with an independent PLC modem, the number of interfaces limits the number of charging guns that can be supported. To support more charging guns, it is necessary to increase the number of MCUs, SECC communication control modules, or use interface expansion chips. This not only increases hardware complexity and cost but also leads to increased communication latency and decreased real-time performance. Summary of the Invention

[0009] The purpose of this invention is to provide a multi-gun shared charging control system and its networking method, which solves the technical problems caused by the repeated configuration of SECC MCU and PLC modem in existing multi-gun charging piles, such as high hardware cost, unclear communication correspondence of multi-guns after sharing PLC resources, complex expansion of peripheral interfaces, and changes in PLC signal transmission conditions after multi-gun coupling branches are connected in parallel.

[0010] To achieve the above objectives, the solution of the present invention is as follows: In a first aspect, the present invention provides a multi-gun shared charging control system, comprising: At least two charging guns; A shared SECC MCU is used to run the ISO 15118 and / or DIN SPEC 70121 high-level charging communication protocol stack, and to maintain the charging communication context corresponding to each charging gun. The shared PLC modem is connected to the shared SECC MCU via a communication interface and is configured to send and receive link-layer messages with the vehicle-side PLC nodes corresponding to each charging gun through the shared PLC signal channel, and supports at least two vehicle-side PLC nodes to join the shared PLC logical network. The PLC signal conditioning network is connected between the shared PLC modem and the coupling / decoupling circuits corresponding to each charging gun, and is used to form the shared PLC signal channel and adapt to changes in PLC signal transmission conditions caused by multiple branch accesses. Each charging gun corresponds to an independent PWM generation module, control guidance status detection circuit, and coupling / decoupling loop. The PWM generation module is used to output control guidance signals to the CP line of the corresponding charging gun. The control guidance status detection circuit is used to detect the voltage or status of the corresponding CP line. The coupling / decoupling loop is used to bidirectionally couple PLC signals between the shared PLC signal channel and the CP / PE line of the corresponding charging gun. The PLC-side ports of each coupling / decoupling loop are connected in parallel to the shared PLC signal channel, the cable-side ports of each coupling / decoupling loop are respectively connected to the CP / PE lines of the corresponding charging gun, and each PWM generation module and control guidance status detection circuit are respectively connected to the CP lines of the corresponding charging gun. The shared SECC MCU maps the messages sent and received by the shared PLC modem to the corresponding charging guns based on the correspondence between the vehicle communication identifier and the charging gun communication context.

[0011] In a preferred embodiment, the PLC signal conditioning network includes: The transmission conditioning branch includes an active filter circuit and a variable gain or attenuation unit, used to select the operating frequency band, compensate the frequency response, and adjust the amplitude of the transmission signal output by the shared PLC modem. The receiving conditioning branch includes an active filter circuit and a variable gain unit, used to select the operating frequency band, suppress out-of-band interference, and adjust the amplitude of the signal received from the shared PLC signal channel; The transceiver splitter / combiner and port load adapter unit is connected to the transmitting conditioning branch, the receiving conditioning branch and the shared PLC signal channel respectively to form a bidirectional common terminal, and performs port adaptation through at least one of the damping network, switchable terminal network, feedback network or adjustable impedance network. The transmit conditioning branch, receive conditioning branch, transmit / receive splitter / combiner, and port load adapter unit can be set separately, partially integrated, or integrated into the analog front end of the shared PLC modem.

[0012] In a preferred embodiment, the coupling / decoupling circuit of each charging gun includes: Coupling capacitors are used to couple high-frequency PLC signals between the shared PLC signal channel and the CP / PE line of the corresponding charging gun. Coupled transformers and damping or filtering networks are used to achieve electrical isolation, frequency selection, or ringing suppression; The PLC-side ports of each coupling / decoupling loop are connected in parallel to the shared PLC signal channel formed by the PLC signal conditioning network, and the cable-side ports of each coupling / decoupling loop are respectively connected to the CP / PE lines of the corresponding charging gun.

[0013] In a preferred embodiment, the shared SECC MCU is configured to control the output of high-level communication trigger states of each PWM generation module, and to set distinct HLC trigger windows for charging guns that have not yet entered the matching process.

[0014] In a preferred embodiment, the shared PLC logic network is a HomePlug Green PHY logic network (AVLN). The shared PLC modem is configured for the AVLN under the control of the shared SECC MCU and uses a set of network identifiers NID and network membership keys NMK; At least two vehicle-side PLC nodes join the AVLN using different MAC addresses; The shared SECC MCU maps the messages sent and received by the shared PLC modem to the communication context of the corresponding charging gun based on at least one of the vehicle MAC address, RunID, network layer address, transport layer connection identifier, or ISO15118 session identifier.

[0015] In the preferred embodiment, the coupling capacitor parameters, damping network or filter network parameters, and PLC signal conditioning parameters of each charging gun corresponding to the branch are calibrated or selected based on at least one of the following: gun wire length level, branch insertion loss, coupling parameters, or port equivalent load.

[0016] Secondly, the present invention provides a multi-gun shared charging network method, which is applied to a charging pile including a shared SECC MCU, a shared PLC modem, a PLC signal conditioning network, and at least two charging guns. The network method includes... The control guidance status of each charging gun is detected separately, and the control guidance signal of the corresponding CP line is controlled by the independent PWM generation module of each charging gun. When at least two charging guns to be matched exist, set HLC trigger windows that are distinct from each other for the charging guns to be matched. Within the corresponding HLC trigger window, make the selected charging gun output the high-level communication trigger state, and make other charging guns to be matched that have not yet entered the matching process maintain the non-high-level communication trigger state. Receive the CM_SLAC_PARM.REQ message broadcast by the vehicle-side PLC node, and bind the communication context between the vehicle-side PLC node and the corresponding charging gun according to the HLC trigger window, the message source MAC address and RunID; After the binding is completed, the SLAC context corresponding to each charging gun is maintained, and multiple SLAC contexts are allowed to overlap in time. After matching is completed, at least two vehicle-end PLC nodes are made to join the shared PLC logical network configured and used by the shared PLC modem using different MAC addresses; Based on at least one of the vehicle MAC address, network layer address, transport layer connection identifier, or ISO 15118 session identifier, continuous communication messages are mapped to the communication context of the corresponding charging gun.

[0017] In the preferred embodiment, SLAC parameter exchange includes the vehicle-side PLC node broadcasting a CM_SLAC_PARM.REQ message and the shared SECC MCU replying with a CM_SLAC_PARM.CNF message via the shared PLC modem; SLAC matching includes the vehicle-side PLC node sending a CM_SLAC_MATCH.REQ message and the shared SECC MCU replying with a CM_SLAC_MATCH.CNF message via the shared PLC modem; The number of SLAC contexts maintained in parallel by the shared SECC MCU meets the EVSE parallel matching processing capability specified in the applicable version ISO 15118-3, and the staggered HLC trigger windows are not used to execute the complete SLAC process sequentially.

[0018] The preferred solution is to add a shared PLC logic network to the vehicle-side PLC node: The shared PLC modem receives link layer messages carrying the source MAC address or destination MAC address; The shared SECC MCU queries the corresponding charging gun communication context and logical SECC instance based on the MAC address; The shared SECC MCU further distinguishes the continuous communication connections corresponding to the same vehicle based on the network layer address, transport layer connection identifier, or ISO 15118 session identifier; The shared SECC MCU distributes received messages to the corresponding logical SECC instances and encapsulates the messages sent by each logical SECC instance into link-layer messages with the target vehicle's MAC address as the destination address.

[0019] In the preferred embodiment, when a charging gun experiences a SLAC timeout or matching failure before being added to the shared PLC logic network, the SLAC context and gun carriage binding corresponding to that charging gun are deleted or suspended, and it is not treated as a continuous communication session. When a charging gun experiences a continuous communication interruption after being added to the shared PLC logic network, delete or suspend the corresponding link layer address, connection identifier, or session identifier mapping of the charging gun, and release the continuous communication processing resources it occupies. The SLAC context, PLC coupling branch, and continuous communication session corresponding to the other charging guns remain running.

[0020] After adopting the above solution, the beneficial effects of the present invention are as follows: 1. This invention reduces the need for redundant protocol processing hardware and PLC communication hardware configuration for each charging gun by having at least two charging guns share the same SECC MCU and the same PLC modem.

[0021] 2. This invention provides each charging gun with an independent PWM generation module, control guidance status detection circuit, and coupling / decoupling loop, enabling the control guidance status of each gun to be processed separately.

[0022] 3. The present invention adapts to changes in signal transmission conditions caused by multiple gun access through a PLC signal conditioning network with transmit conditioning path, receive conditioning path, transmit / receive split / combination function and port load adaptation function.

[0023] 4. This invention establishes a gun-vehicle binding through the HLC trigger window, vehicle MAC address, and RunID, and distributes messages in the shared PLC logical network according to the link layer address and session identifier, enabling a single shared PLC modem to correspond to multiple vehicle-end PLC nodes. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the existing system architecture with an independent SECC communication control module for each gun; Figure 2 This is a schematic diagram of the system architecture in an embodiment of the present invention; Figure 3 This is a timing diagram of HLC peak-shifting triggering and parallel SLAC in an embodiment of the present invention; Figure 4 This is a schematic diagram of shared AVLN persistent communication and session mapping in an embodiment of the present invention; Figure 5This is a schematic diagram of a PLC signal conditioning network with a sending path and a receiving path in an embodiment of the present invention; Figure 6 This is a schematic diagram of the coupling relationship between the EVSE side and the EV side PLC of any charging gun in this embodiment of the invention, wherein the vehicle side resistor designation adopts the definition of IEC 61851-1:2017; Figure 7 This is a schematic diagram of shared AVLN multi-node networking and communication session mapping in an embodiment of the present invention. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 2 As shown, this embodiment provides a multi-gun shared charging control system based on a hardware-sharing architecture. The charging station equipment includes a shared SECC MCU, a shared PLC modem, a PLC signal conditioning network, at least two charging guns, and an independent PWM generation module, control guidance status detection circuit, and coupling / decoupling loops for each gun. The shared SECC MCU and the shared PLC modem are connected via a communication interface. The shared PLC modem is connected to the shared PLC signal channel via the PLC signal conditioning network, and each coupling / decoupling loop is connected in parallel to the shared PLC signal channel.

[0027] The shared PLC modem can be a PLC modem compliant with ISO 15118-3 and the HomePlug Green PHY specification, capable of multi-node link layer message transmission and reception. It connects to the shared SECC MCU via SPI, UART, USB, Ethernet, or other communication interfaces, providing the shared SECC MCU with interfaces for Ethernet frame transmission and reception, network parameter configuration, SLAC management, and link status. Specific chip models and interface types can be selected based on the actual application.

[0028] The bidirectional PLC signal terminals of the shared PLC modem are connected to the shared PLC signal channel via a PLC signal conditioning network. Each charging gun corresponds to an independent coupling / decoupling circuit. The PLC-side ports of each coupling / decoupling circuit are connected in parallel to the shared PLC signal channel, and the cable-side ports are connected to the CP / PE lines of the corresponding charging gun. Thus, multiple charging guns share the shared PLC modem and its PLC signal conditioning network, while retaining independent control guidance and coupling branches for each gun.

[0029] The hardware connections and networking relationships in this embodiment include: ① The shared SECC MCU connects to the shared PLC modem via a communication interface; ② The shared PLC modem connects to the shared PLC signal channel via the PLC signal conditioning network; ③ The PLC-side ports of multiple coupling / decoupling loops are connected in parallel to a shared PLC signal channel; ④ The cable-side ports of each coupling / decoupling circuit are respectively connected to the CP / PE lines of the corresponding charging gun; ⑤ Each charging gun corresponds to an independent PWM generation module and control guidance status detection circuit; ⑥ The shared PLC modem establishes a shared PLC logical network with at least two vehicle-side PLC nodes, and the shared SECC MCU maintains the correspondence between the gun number, vehicle communication identifier, and charging communication context.

[0030] like Figure 5 As shown, a feasible bidirectional structure for a PLC signal conditioning network includes a transmit conditioning branch, a receive conditioning branch, and transmit / receive splitters / combiners and port load adapters. The transmit conditioning branch may include an active filter circuit and a variable gain or attenuation unit for frequency selection, frequency response compensation, and amplitude adjustment of the transmitted signal. The receive conditioning branch may include an active filter circuit and a variable gain unit for frequency selection, out-of-band interference suppression, and amplitude adjustment of the received signal. The transmit / receive splitter / combiner and port load adapters connect the transmit branch, the receive branch, and the bidirectional common terminal, and can be port-adapted through a damping network, a switchable terminal network, a feedback network, or an adjustable impedance network. These functions can be implemented discretely, partially integrated, or integrated into the PLC modem analog front-end. When the PLC modem adopts a single-port transceiver structure, the corresponding transmit and receive paths can also be implemented through transmit / receive switching or a full-duplex interface.

[0031] Each charging gun corresponds to an independent PWM generation module and a control guidance status detection circuit. A shared SECCMCU can control the output status of each PWM generation module and set distinct HLC trigger windows for charging guns that have not yet entered the matching process. These windows are used to stagger the timing of higher-layer communication triggering and the reception of the first SLAC parameter request, and are not used to execute the complete SLAC process sequentially. The frequency, duty cycle, rise and fall times, and status voltage of the control guidance signal are determined according to applicable versions IEC 61851-1 and ISO 15118-3, and a fixed filter cutoff frequency is not specified separately in this invention.

[0032] like Figure 6As shown in the figure, the EVSE-side coupling / decoupling circuit, CP / PE charging cable, and EV-side coupling circuit are illustrated for any charging gun. The resistor designations in the vehicle-side control guidance branch follow the definition in IEC 61851-1:2017, where R3 is a permanent connection resistor and R2 is a state-switching resistor connected via switch S2. When using other standard versions or diagrams, the functional relationship between the permanent and switching resistors should be considered. PWM is generated from the EVSE side. The vehicle changes the CP line load state through diodes, R3, R2, and S2. The EVSE-side control guidance state detection circuit detects the CP voltage or state and does not represent it as a vehicle-returned PWM signal. The PLC high-frequency signal is transmitted bidirectionally between the EVSE and EV sides via the coupling / decoupling circuit.

[0033] When different charging guns have different cable lengths and branch parameters, the coupling capacitors, damping or filtering networks, and PLC signal conditioning parameters can be calibrated or selected based on the cable length grade, branch insertion loss, coupling parameters, port equivalent load, and prototype test results. These components are used to change the coupling degree, damping effect, and port equivalent load, without changing the characteristic impedance of the cable itself. This invention does not limit fixed length segments or component values.

[0034] In a preferred networking implementation, a shared PLC modem establishes a shared HomePlug GreenPHY logical network (AVLN) and maintains a network identifier (NID) and a network membership key (NMK) for the current AVLN. At least two vehicle-end PLC nodes join the AVLN using different MAC addresses. The NID is generated by the NMK according to the HomePlug Green PHY rules; the NMK can be generated when establishing or rebuilding the shared AVLN and configured by the shared SECC MCU through the network management interface of the shared PLC modem.

[0035] like Figure 3 As shown, the shared SECC MCU sets distinct HLC trigger windows for charging guns that have not yet entered the matching process, based on the control guidance status of each gun. Upon receiving a high-level communication trigger from the corresponding gun, the vehicle broadcasts a CM_SLAC_PARM.REQ message. The shared SECC MCU establishes an initial binding between the gun number, vehicle node, and SLAC context based on the trigger window, the message source MAC address, and the RunID, and replies with a CM_SLAC_PARM.CNF message. After the initial binding is completed, the SLAC contexts can overlap in time. The parallel matching processing capability of the shared SECC MCU and the shared PLC modem meets the requirements of C_EVSE_match_parallel in the applicable version ISO 15118-3; in ISO 15118-3:2015, the minimum value for this capability is 5.

[0036] During the subsequent matching process, the vehicle-side PLC node sends a CM_SLAC_MATCH.REQ message. The shared SECC MCU replies with a CM_SLAC_MATCH.CNF message via the shared PLC modem, and provides the successfully matched vehicle node with the NID and NMK corresponding to the shared AVLN. After the vehicle node joins the shared AVLN, the shared SECC MCU distributes the messages received by the shared PLC modem to the corresponding logical SECC instance based on the vehicle's MAC address, IPv6 address, TCP connection identifier, or ISO 15118 session identifier, and sends the messages sent by the logical SECC instance with the target vehicle's MAC address as the destination address.

[0037] like Figure 4 As shown, after the shared AVLN is established, multiple vehicle-side PLC nodes join the same AVLN through different MAC addresses. The shared SECC MCU maintains the mapping relationship between the gun number, vehicle MAC address, RunID and logical SECC instance identifier, and completes the message reception, distribution and transmission multiplexing accordingly.

[0038] like Figure 7 As shown, the shared SECC MCU can maintain the gun-end communication context and mapping table. The mapping table includes at least the gun number, vehicle MAC address, RunID, and logical SECC instance identifier, and may further include the network layer address, transport layer connection identifier, and ISO 15118 session identifier. The shared AVLN and the above mapping relationship constitute a preferred operating mode; specific data structures, message queues, and query algorithms can be replaced, and other network management mechanisms that enable the shared PLC modem to maintain distinguishable communication relationships with multiple vehicle-end PLC nodes can also be adopted.

[0039] The direction of SLAC parameter exchange and matching messages is as follows: the vehicle-side PLC node broadcasts CM_SLAC_PARM.REQ, and the shared SECC MCU replies with CM_SLAC_PARM.CNF via the shared PLC modem; the vehicle-side PLC node sends CM_SLAC_MATCH.REQ, and the shared SECC MCU replies with CM_SLAC_MATCH.CNF via the shared PLC modem.

[0040] In this embodiment, staggering the HLC trigger windows is only used to distinguish the initial CM_SLAC_PARM.REQ reception timing of each gun, and does not change the timeout timing rules of the SLAC process itself. The response time, number of retries, and timeout handling of each stage of SLAC are still executed in accordance with the applicable version ISO 15118-3, where T_conn_max_comm represents the maximum time from gun insertion to the low-level communication module being ready, and is not used as the timeout time for the complete SLAC process.

[0041] Peak shifting control is only used to distinguish the HLC triggering and initial CM_SLAC_PARM.REQ receive window of each gun; after the gun number, MAC address and RunID binding is completed, multiple SLAC matching processes are allowed to proceed in parallel, instead of using the serial method of completing the entire SLAC segment by gun.

[0042] Different vehicle PLC nodes in a shared AVLN are distinguished by different MAC addresses. For broadcast or multicast management messages, the shared SECC MCU uses the RunID and the current SLAC context to determine ownership; for continuous communication unicast messages, it uses the source or destination MAC address, network layer address, transport layer connection identifier, or session identifier for mapping.

[0043] The shared SECC MCU can also provide vehicle charging demand data from each logical SECC instance to an external power distribution control unit. Power module scheduling is not a necessary condition for the establishment of the shared PLC hardware connection structure of this invention; its specific power coordination strategy can be implemented separately.

[0044] The vehicle-side equipment is configured independently for each vehicle, including the vehicle-side coupling circuit, vehicle-side PLC filter module, vehicle-side PLC modem, vehicle communication controller (EVCC), and control guidance state switching branch. For example... Figure 6 As shown, the vehicle-side control guidance branch may include an input capacitor C_V, a diode D, a permanent resistor R3, and a state-switching resistor R2 connected by switch S2. Their designations and parameters are determined according to IEC 61851-1:2017 or the adopted standard version. The vehicle-side PLC modem is used to perform PLC signal modulation and demodulation and connects to the EVCC; the EVCC is used to process charging communication data and perform charging parameter negotiation.

[0045] If a gun experiences a SLAC timeout or matching failure before joining the shared AVLN, the shared SECC MCU deletes or suspends its SLAC context and gun carrier binding, and does not add it to the continuous communication session mapping. If a gun experiences a continuous communication interruption after joining the shared AVLN, the shared SECC MCU deletes or suspends its link layer address, connection identifier, or session identifier mapping. The PLC coupling branches, SLAC contexts, and continuous communication sessions of the remaining charging guns remain operational.

[0046] This embodiment also provides a networking method based on the above hardware architecture, including the following steps: The control guidance status of each charging gun is detected separately, and the control guidance signal of the corresponding CP line is controlled by the independent PWM generation module of each charging gun. Set distinct HLC trigger windows for at least two charging guns to be matched, and make the selected charging gun output a high-level communication trigger state within the corresponding window. Receive the CM_SLAC_PARM.REQ message broadcast by the vehicle-side PLC node, and bind the communication context between the vehicle-side PLC node and the corresponding charging gun according to the HLC trigger window, the message source MAC address and RunID; The shared PLC modem replies with a CM_SLAC_PARM.CNF message, and after the initial binding is completed, it maintains the SLAC context corresponding to each charging gun, so that multiple SLAC contexts can overlap and advance in time. Receive the CM_SLAC_MATCH.REQ message sent by the vehicle-side PLC node, reply with the CM_SLAC_MATCH.CNF message via the shared PLC modem, and provide the NID and NMK corresponding to the shared AVLN to the successfully matched vehicle-side PLC node; Ensure that at least two vehicle-side PLC nodes join the shared AVLN using different MAC addresses; The shared PLC modem receives link layer messages carrying the source MAC address or destination MAC address, and the shared SECCMCU queries the corresponding charging gun communication context and logical SECC instance based on the MAC address. The shared SECC MCU further distinguishes persistent communication connections based on network layer address, transport layer connection identifier or ISO 15118 session identifier, and distributes received messages to the corresponding logical SECC instance; When a SLAC failure occurs before a vehicle node joins the shared AVLN, only the corresponding SLAC context and gun-vehicle binding are deleted or suspended; when a continuous communication interruption occurs after a vehicle node joins the shared AVLN, the corresponding link layer address, connection identifier, or session identifier mapping is deleted or suspended. Keep the PLC coupling branch, SLAC context, and continuous communication session running for the remaining charging guns.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A multi-gun shared charging control system, characterized in that: include: At least two charging guns; A shared SECC MCU is used to run the ISO 15118 and / or DIN SPEC 70121 high-level charging communication protocol stack, and to maintain the charging communication context corresponding to each charging gun. The shared PLC modem is connected to the shared SECC MCU via a communication interface and is configured to send and receive link-layer messages with the vehicle-side PLC nodes corresponding to each charging gun through the shared PLC signal channel, and supports at least two vehicle-side PLC nodes to join the shared PLC logical network. The PLC signal conditioning network is connected between the shared PLC modem and the coupling / decoupling circuits corresponding to each charging gun, and is used to form the shared PLC signal channel and adapt to changes in PLC signal transmission conditions caused by multiple branch accesses. Each charging gun corresponds to an independent PWM generation module, control guidance status detection circuit, and coupling / decoupling loop. The PWM generation module is used to output control guidance signals to the CP line of the corresponding charging gun. The control guidance status detection circuit is used to detect the voltage or status of the corresponding CP line. The coupling / decoupling loop is used to bidirectionally couple PLC signals between the shared PLC signal channel and the CP / PE line of the corresponding charging gun. The PLC-side ports of each coupling / decoupling loop are connected in parallel to the shared PLC signal channel, the cable-side ports of each coupling / decoupling loop are respectively connected to the CP / PE lines of the corresponding charging gun, and each PWM generation module and control guidance status detection circuit are respectively connected to the CP lines of the corresponding charging gun. The shared SECC MCU maps the messages sent and received by the shared PLC modem to the corresponding charging guns based on the correspondence between the vehicle communication identifier and the charging gun communication context.

2. The multi-gun shared charging control system as described in claim 1, characterized in that: The PLC signal conditioning network includes: The transmission conditioning branch includes an active filter circuit and a variable gain or attenuation unit, used to select the operating frequency band, compensate the frequency response, and adjust the amplitude of the transmission signal output by the shared PLC modem. The receiving conditioning branch includes an active filter circuit and a variable gain unit, used to select the operating frequency band, suppress out-of-band interference, and adjust the amplitude of the signal received from the shared PLC signal channel; The transceiver splitter / combiner and port load adapter unit is connected to the transmitting conditioning branch, the receiving conditioning branch and the shared PLC signal channel respectively to form a bidirectional common terminal, and performs port adaptation through at least one of the damping network, switchable terminal network, feedback network or adjustable impedance network. The transmit conditioning branch, receive conditioning branch, transmit / receive splitter / combiner, and port load adapter unit can be set separately, partially integrated, or integrated into the analog front end of the shared PLC modem.

3. The multi-gun shared charging control system as described in claim 1, characterized in that: The coupling / decoupling circuit for each charging gun includes: Coupling capacitors are used to couple high-frequency PLC signals between the shared PLC signal channel and the CP / PE line of the corresponding charging gun. Coupled transformers and damping or filtering networks are used to achieve electrical isolation, frequency selection, or ringing suppression; The PLC-side ports of each coupling / decoupling loop are connected in parallel to the shared PLC signal channel formed by the PLC signal conditioning network, and the cable-side ports of each coupling / decoupling loop are respectively connected to the CP / PE lines of the corresponding charging gun.

4. The multi-gun shared charging control system as described in claim 1, characterized in that: The shared SECC MCU is configured to control the output of high-level communication trigger states of each PWM generation module, and to set distinct HLC trigger windows for charging guns that have not yet entered the matching process.

5. A multi-gun shared charging control system as described in claim 1, characterized in that: The shared PLC logic network is the HomePlug Green PHY logic network AVLN; The shared PLC modem is configured for the AVLN under the control of the shared SECC MCU and uses a set of network identifiers NID and network membership keys NMK; At least two vehicle-side PLC nodes join the AVLN using different MAC addresses; The shared SECC MCU maps the messages sent and received by the shared PLC modem to the communication context of the corresponding charging gun based on at least one of the vehicle MAC address, RunID, network layer address, transport layer connection identifier, or ISO15118 session identifier.

6. The multi-gun shared charging control system as described in claim 1, characterized in that: The coupling capacitor parameters, damping network or filter network parameters, and PLC signal conditioning parameters of each charging gun's corresponding branch are calibrated or selected based on at least one of the following: gun wire length level, branch insertion loss, coupling parameters, or port equivalent load.

7. A method for networking multi-gun shared charging, characterized in that: This networking method is applied to charging stations that include a shared SECC MCU, a shared PLC modem, a PLC signal conditioning network, and at least two charging guns. The networking method includes... The control guidance status of each charging gun is detected separately, and the control guidance signal of the corresponding CP line is controlled by the independent PWM generation module of each charging gun. When at least two charging guns to be matched exist, set HLC trigger windows that are distinct from each other for the charging guns to be matched. Within the corresponding HLC trigger window, make the selected charging gun output the high-level communication trigger state, and make other charging guns to be matched that have not yet entered the matching process maintain the non-high-level communication trigger state. Receive the CM_SLAC_PARM.REQ message broadcast by the vehicle-side PLC node, and bind the communication context between the vehicle-side PLC node and the corresponding charging gun according to the HLC trigger window, the message source MAC address and RunID; After the binding is completed, the SLAC context corresponding to each charging gun is maintained, and multiple SLAC contexts are allowed to overlap in time. After matching is completed, at least two vehicle-end PLC nodes are made to join the shared PLC logical network configured and used by the shared PLC modem using different MAC addresses; Based on at least one of the vehicle MAC address, network layer address, transport layer connection identifier, or ISO 15118 session identifier, continuous communication messages are mapped to the communication context of the corresponding charging gun.

8. A multi-gun shared charging network method as described in claim 7, characterized in that: SLAC parameter exchange includes the vehicle-side PLC node broadcasting the CM_SLAC_PARM.REQ message and the shared SECC MCU replying with the CM_SLAC_PARM.CNF message via the shared PLC modem; SLAC matching includes the vehicle-side PLC node sending a CM_SLAC_MATCH.REQ message and the shared SECC MCU replying with a CM_SLAC_MATCH.CNF message via the shared PLC modem; The number of SLAC contexts maintained in parallel by the shared SECC MCU meets the EVSE parallel matching processing capability specified in the applicable version ISO 15118-3, and the staggered HLC trigger windows are not used to execute the complete SLAC process sequentially.

9. A multi-gun shared charging network method as described in claim 7, characterized in that: After adding the shared PLC logic network to the vehicle-side PLC node: The shared PLC modem receives link layer messages carrying the source MAC address or destination MAC address; The shared SECC MCU queries the corresponding charging gun communication context and logical SECC instance based on the MAC address; The shared SECC MCU further distinguishes the continuous communication connections corresponding to the same vehicle based on the network layer address, transport layer connection identifier, or ISO 15118 session identifier; The shared SECC MCU distributes received messages to the corresponding logical SECC instances and encapsulates the messages sent by each logical SECC instance into link-layer messages with the target vehicle's MAC address as the destination address.

10. A multi-gun shared charging network method as described in claim 7, characterized in that: When a charging gun experiences a SLAC timeout or matching failure before being added to the shared PLC logic network, the SLAC context and gun carriage binding corresponding to that charging gun are deleted or suspended, and it is not treated as a continuous communication session. When a charging gun experiences a continuous communication interruption after being added to the shared PLC logic network, delete or suspend the corresponding link layer address, connection identifier, or session identifier mapping of the charging gun, and release the continuous communication processing resources it occupies. The SLAC context, PLC coupling branch, and continuous communication session corresponding to the other charging guns remain running.

Images