Communication control method and system for various vehicles of direct current charging pile

Abstract

The invention belongs to the technical field of charging piles, and discloses a direct current charging pile multi-vehicle communication control method and system, and the method comprises the steps: after the charging pile detects that a charging gun is inserted into a vehicle socket, a gun insertion confirmation switch is closed, and a gun insertion signal is detected; after the charging pile detects a charging signal, a K3 relay and a K4 relay are closed to wake up a vehicle controller, and a first communication protocol is adopted to carry out charging parameter negotiation; if the charging parameter negotiation performed by the first communication protocol fails or is overtime, K3 and K4 relays and a gun insertion confirmation switch are switched off; the gun insertion confirmation switch, the K3 relay and the K4 relay are closed again within preset time, after a charging signal is detected, charging parameter negotiation is repeated by using the second communication protocol to the nth communication protocol in sequence, and the K3 relay, the K4 relay and the gun insertion confirmation switch are switched off every time the charging signal fails or is overtime; and after the nth protocol negotiation fails, the GB / T 27930 protocol is adopted for charging, no matter which non-standard protocol is adopted by the vehicle, charging parameter negotiation can be carried out, and the problem that new energy vehicles of different brands are difficult to charge is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of charging piles, and relates to a communication control method and system for various vehicles of a direct-current charging pile. BACKGROUND

[0002] With the continuous expansion of the new energy vehicle market, consumers' requirements for vehicle performance are increasingly stringent. Among them, the driving range and fast charging are two core demands. The driving range is one of the key factors restricting the widespread popularity of new energy vehicles, and is directly related to users' use experience and travel convenience. In order to effectively alleviate users' range anxiety, major automakers and research institutions have invested a lot of resources in improving the driving range and have made significant progress. At present, the driving range of mainstream new energy vehicles has generally achieved a major breakthrough, and can stably reach 500-700 kilometers.

[0003] At the same time when the driving range is continuously improved, consumers' demand for fast charging of new energy vehicles is increasingly urgent. Fast charging technology can greatly shorten the charging time of vehicles, improve the use efficiency, and reduce the waiting cost of users. According to the current standard, the maximum current specified by the national standard direct-current charging vehicle pile interaction protocol can only reach 400A, which leads vehicle manufacturers to develop a supplementary protocol based on the current national standard direct-current charging vehicle pile interaction protocol to achieve super-charging and flash-charging functions. However, the lack of unified standard specification leads to the existence of various non-standard protocols based on the national standard direct-current charging vehicle pile interaction protocol on the market.

[0004] Most charging piles can only select one or a few fast-charging custom protocols of vehicle manufacturers, and cannot achieve comprehensive compatibility with multiple non-standard protocols. This makes new energy vehicles of different brands face many inconveniences when charging, and needs to find charging piles of specific brands or specific protocols to achieve fast charging, which seriously affects the convenience and efficiency of charging. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a communication control method and system for various vehicles of a direct-current charging pile.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: The present application provides a communication control method for various vehicles of a direct-current charging pile, comprising the following steps: The charging pile detects that the charging gun is inserted into the vehicle socket, closes the gun insertion confirmation switch and detects the gun insertion signal; the charging pile detects the charging signal, closes K3 and K4 relays to wake up the vehicle controller, and uses a first communication protocol to negotiate charging parameters; if the first communication protocol fails or times out, K3 and K4 relays and the gun insertion confirmation switch are disconnected; the gun insertion confirmation switch and K3 and K4 relays are re-closed within a preset time, and after detecting the charging signal, the second to nth communication protocols are used in turn to repeat the charging parameter negotiation, and each failure or timeout disconnects K3 and K4 relays and the gun insertion confirmation switch; after the nth protocol negotiation fails, GB / T 27930 protocol is used for charging, and any successful charging parameter negotiation performs the corresponding protocol charging process.

[0007] Further, the first communication protocol, the second communication protocol,..., and the nth communication protocol are sorted in order of priority from high to low; when a high-priority communication protocol negotiation is successful, all low-priority communication protocols are skipped.

[0008] Further, in the process of using the second to nth communication protocols in turn to repeat the charging parameter negotiation, after each time the gun insertion confirmation switch and K3 and K4 relays are re-closed, the charging pile first re-detects the charging signal; when the charging signal is detected, the current communication protocol is used to negotiate charging parameters with the vehicle controller.

[0009] Further, when using a certain communication protocol to negotiate charging parameters, if communication timeout occurs, the charging pile immediately stops the current protocol negotiation and records the failure, disconnects K3 and K4 relays and the gun insertion confirmation switch, and after a preset time, re-closes the gun insertion confirmation switch and K3 and K4 relays, and switches to the next priority communication protocol to negotiate charging parameters.

[0010] Further, after the nth protocol negotiation fails, GB / T 27930 protocol is used for charging, including the following steps: performing initialization configuration on the communication module of the charging pile according to the GB / T 27930 standard; using the initialized GB / T 27930 protocol to negotiate charging parameters with the vehicle controller, and charging.

[0011] Further, the charging pile monitors the charging state, communication state and gun insertion signal in real time during charging; if any of the charging interruption, communication failure or gun insertion signal abnormality is monitored, K3 and K4 relays and the gun insertion confirmation switch are immediately disconnected, the charging is terminated, and the fault information is fed back.

[0012] Further, the charging pile closes K3 and K4 relays to wake up the vehicle controller after detecting the charging signal, and uses the first communication protocol to negotiate charging parameters, including the following steps: immediately close the plug-in gun confirmation switch and detect the plug-in gun signal; after detecting the start charging signal, close K3 and K4 relays to wake up the vehicle controller; and use the first communication protocol to negotiate charging parameters with the vehicle controller.

[0013] Further, the preset time for re-closing the plug-in gun confirmation switch and K3 and K4 relays after disconnecting K3 and K4 relays and the plug-in gun confirmation switch is 3-5 seconds.

[0014] Further, the charging pile detects the plug-in gun signal through CC1, and the vehicle controller detects the point voltage value for judgment; when the CC2 detection point voltage is U2, the charging gun has not been inserted into the vehicle socket; when the CC2 detection point voltage is U2 / 2, the charging gun has been inserted into the vehicle socket; wherein U2 is the standard reference voltage of the vehicle controller.

[0015] A communication control system of a direct-current charging pile for multiple vehicles, comprising: The detection unit is used for closing the plug-in gun confirmation switch and detecting the plug-in gun signal after the charging pile detects that the charging gun has been inserted into the vehicle socket; the first negotiation unit is used for closing K3 and K4 relays to wake up the vehicle controller after the charging pile detects the charging signal, and using the first communication protocol to negotiate charging parameters; the judgment unit is used for disconnecting K3 and K4 relays and the plug-in gun confirmation switch if the first communication protocol fails or times out in negotiating charging parameters; the second negotiation unit is used for re-closing the plug-in gun confirmation switch and K3 and K4 relays within a preset time, and using the second to nth communication protocols to repeatedly negotiate charging parameters in sequence after detecting the charging signal, and disconnecting K3 and K4 relays and the plug-in gun confirmation switch each time if the negotiation fails or times out; and the charging unit is used for using the GB / T 27930 protocol to charge after the nth protocol negotiation fails, and performing the corresponding protocol charging process if any of the charging parameter negotiations is successful.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: The communication control method of the direct-current charging pile for multiple vehicles of the present application negotiates charging parameters by trying multiple communication protocols in sequence, including the first communication protocol to the nth communication protocol and the final GB / T 27930 protocol, realizes the compatibility of the charging pile for multiple non-standard protocols, can negotiate charging parameters regardless of the non-standard protocol used by the vehicle, greatly improves the convenience and efficiency of charging, and solves the problem of difficult charging of different brands of new energy vehicles.

[0017] This invention provides a communication control method for multiple vehicles using a DC charging pile. During the charging parameter negotiation process, if the first communication protocol negotiation fails or times out, the K3 and K4 relays and the plug-in confirmation switch will be disconnected. Then, they will be re-closed within a preset time to negotiate subsequent protocols. This dynamic adjustment and multiple-attempt mechanism avoids situations where charging cannot proceed due to the failure of a single protocol negotiation, optimizes the charging parameter negotiation process, and increases the probability of successful charging. Attached Figure Description

[0018] Figure 1 This is a flowchart of a communication control method for multiple vehicles using a DC charging pile according to the present invention. Figure 2 This is a circuit diagram of a communication control method for multiple vehicles using a DC charging pile according to the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] Example 1 A communication control method for multiple vehicles in a DC charging pile includes the following steps: After the charging pile detects that the charging gun is inserted into the vehicle socket, it closes the gun insertion confirmation switch and detects the insertion signal. Upon detecting the charging signal, the charging pile closes relays K3 and K4 to wake up the vehicle controller and negotiates charging parameters using the first communication protocol. If the first communication protocol fails to negotiate charging parameters or times out, relays K3 and K4 and the gun insertion confirmation switch are disconnected. Within a preset time, the gun insertion confirmation switch and relays K3 and K4 are closed again. After detecting the charging signal, the charging parameters are negotiated again using the second to nth communication protocols sequentially. Each time there is a failure or timeout, relays K3 and K4 and the gun insertion confirmation switch are disconnected. If the nth protocol fails to negotiate, the GB / T 27930 protocol is used for charging. If any charging parameter negotiation is successful, the corresponding protocol charging process is executed. Figure 1 As shown.

[0021] The conventional scheme attempts in a fixed protocol sequence, but there is a risk of communication failure due to protocol conflict. By analyzing the interaction characteristics of different car company protocols, it is found that there is a correlation between protocol priority and vehicle wake-up timing. Based on this, a phased reset strategy is proposed: disconnect the physical connection after each protocol attempt fails to eliminate residual signal interference, and switch the protocol type when the communication link is re-established. It not only retains the flexibility of protocol adaptation, but also avoids continuous failure caused by signal interference, while the national standard protocol is used as the final safeguard.

[0022] The application proposes that the charging pile detects the insertion of the charging gun into the vehicle socket, closes the plug-in gun confirmation switch and detects the plug-in gun signal; after detecting the charging signal, the relay is closed to wake up the vehicle controller, and the first communication protocol is used for charging parameter negotiation; if the negotiation fails or times out, the relay and the plug-in gun confirmation switch are disconnected; within a preset time, the switch and the relay are closed again, and after detecting the charging signal, the second to nth communication protocols are used in turn to repeat the negotiation, and the connection is disconnected each time it fails; the GB / T 27930 protocol is used for charging after the nth protocol fails, and any successful protocol executes the corresponding process.

[0023] Among them, the plug-in gun confirmation switch refers to an electronic switch that controls the physical connection state of the charging gun, which can be implemented by using an electromagnetic relay or a solid-state relay, and is used to establish an electrical connection between the charging pile and the vehicle. K3 and K4 relays refer to double relays that control the output of low-voltage auxiliary power supply, which can be implemented by using a vehicle-grade 12V / 24V relay module, and are used to provide wake-up power to the vehicle controller. The first communication protocol to the nth communication protocol refers to a non-standard communication protocol sorted by priority, which can be implemented by using a CAN bus or a PLC communication module, and is used to adapt to the private charging protocols of different car companies. The preset time refers to the protocol switching interval, which can be implemented by using a timer module, for example, set to 3-5 seconds, to ensure that the physical connection is completely disconnected and then re-established.

[0024] The insertion of the charging gun triggers the plug-in gun signal detection, at which time the plug-in gun confirmation switch is closed to establish a basic connection. After detecting a valid charging signal, the communication module of the vehicle controller is activated by closing the K3 and K4 relays. The first communication protocol is used to negotiate parameters, and if communication timeout or data verification fails, all connections are immediately disconnected to eliminate interference. After waiting for a preset time, the connection is re-established, and the sub-priority protocols are tried in turn. For example, in a certain charging, after the first protocol attempt fails to use the Tesla supercharging protocol, the connection is re-established after an interval of 4 seconds, and the second protocol attempt succeeds to use the BYD boost protocol, i.e. the subsequent protocol attempts are terminated. When all non-standard protocols fail, the national standard protocol is forcibly switched to ensure basic charging function.

[0025] The scheme completely eliminates the communication state by physically disconnecting, and combines the priority sorting strategy to make the high adaptability protocol try first. For example, a certain charging pile is built-in Tesla, NIO and XPENG three protocols, when a NIO vehicle is inserted, the NIO protocol is tried first and succeeds directly, avoiding meaningless Tesla protocol attempt, and significantly improving negotiation efficiency. The charging pile realizes self-adaptive compatibility of multiple non-standard protocols, effectively reduces the communication failure rate caused by protocol conflict. When a vehicle of a certain brand charges using its private protocol, the charging pile can quickly match the corresponding protocol to complete parameter negotiation without the user needing to find a specific charging pile. For vehicles with uncommon protocols, through multiple rounds of protocol attempts and national standard protocols, it is ensured that all vehicles can complete charging, and the utilization rate of charging facilities is improved.

[0026] The priority sorting refers to sequentially arranging the communication protocols of different vehicle enterprises according to preset rules. Specifically, market share data or charging efficiency indicators can be used as the basis for sorting, and the protocol priority list is realized by pre-configuration. The sorting mechanism can preferentially adapt to mainstream vehicle model protocols, and improve the first negotiation success rate. Among them, skipping low priority protocols refers to automatically terminating the detection process of subsequent protocols after the high priority protocol successfully establishes communication. Specifically, this can be realized by interrupting the subsequent protocol switching instruction in the logic controller. This mechanism avoids the invalid protocol polling process and reduces resource consumption during the charging preparation phase.

[0027] After detecting the charging signal, the charging pile tries to establish communication with the vehicle controller in the preset priority order. For example, the protocol of the vehicle enterprise with the highest market share is tried first. If the protocol successfully completes the charging parameter negotiation, it directly enters the charging process and does not execute the detection step of the subsequent low priority protocol. If the current protocol negotiation fails, it switches to the next priority protocol in order to re-try. Through this mechanism, the charging pile can match the available protocol in the shortest path, reduce the number of protocol switching, and significantly shorten the protocol matching time. This solves the problem of low efficiency caused by unreasonable protocol adaptation order of the charging pile, realizes efficient compatibility of non-standard protocols of different vehicle enterprises, shortens the time consumption in the charging preparation phase, and reduces resource waste in the protocol detection process.

[0028] Re-closing the plug-in gun confirmation switch and K3, K4 relays refers to resetting the physical connection state through the control circuit, which can be realized by using a time relay in combination with a voltage detection module, and is used to eliminate the electrical signal residue caused by the previous protocol negotiation failure. Re-detecting the charging signal refers to verifying the wake-up state of the vehicle controller again, which can be realized by a detection point voltage sampling circuit, and is used to confirm that the vehicle controller is in a communicable state. Using the current communication protocol refers to loading the corresponding communication protocol stack according to the preset priority order, which can be realized by dynamically loading different communication protocols using a protocol switching module, and is used to ensure that the protocol version matches the vehicle controller.

[0029] During the protocol switching process, the opening and closing operation of the plug-in confirmation switch and the relay will produce transient electrical interference. By re-detecting the charging signal, the real charging request and the interference signal can be effectively distinguished. When a valid charging signal is detected, the protocol switching module automatically loads the current priority communication protocol and establishes a data link layer connection with the vehicle controller. When switching to the second communication protocol, the charging pile control unit first disconnects all relays, and after a preset delay, the relay group is re-closed. At this time, the voltage detection circuit continuously samples the vehicle end signal, and when the sampling value reaches the preset threshold, the protocol stack loading program is triggered to avoid protocol mismatch caused by signal jitter.

[0030] If communication timeout occurs, the charging pile immediately stops the current protocol negotiation and records the failure, disconnects K3, K4 relays and plug-in confirmation switch, and after a preset time, re-closes the plug-in confirmation switch and K3, K4 relays, switches to the next priority communication protocol for charging parameter negotiation.

[0031] Communication timeout refers to the state that the charging pile and the vehicle controller do not complete data interaction within a set time threshold. It can be realized by using a timer module to monitor the communication response interval, which is used to identify the protocol negotiation failure state to trigger the switching mechanism. Disconnecting K3, K4 relays means cutting off the physical connection between the charging pile and the vehicle controller. Specifically, it can be realized by using an electromagnetic relay control circuit to control the on-off, which can eliminate the interference of residual charge on subsequent protocol negotiation. The preset time refers to the minimum interval required for hardware reset, which can be realized by setting the time parameter of the programmable logic controller. This interval needs to ensure the reliability of the relay contact completely separated and then re-closed.

[0032] After detecting the communication timeout event, the charging pile main control unit sends an interrupt instruction to the relay drive circuit, cuts off the K3, K4 relay power supply circuit to separate the contacts, and simultaneously disconnects the plug-in confirmation switch to eliminate signal residue. At this time, the fault recording module stores the current protocol identification and timeout timestamp into the non-volatile memory. After a preset hardware reset period, the control unit reactivates the plug-in confirmation switch and closes the relay to establish a new physical connection channel. The protocol management module automatically loads the next level communication protocol version and sends negotiation request messages to the vehicle controller through the data bus. By time-sharing multiplexing hardware resources, the protocol is quickly iterated and tested under the premise of ensuring electrical safety.

[0033] After the nth protocol negotiation fails, GB / T 27930 protocol is used for charging, including the following steps: performing initialization configuration on the communication module of the charging pile according to the GB / T 27930 standard; using the initialized GB / T 27930 protocol to negotiate charging parameters with the vehicle controller, and charging.

[0034] The initialization configuration refers to restoring the working parameters of the communication module to the basic state defined by the national standard. Specifically, it can be achieved by clearing the non-standard protocol cache data and resetting the communication port configuration parameters, which is used to eliminate the interference of residual non-standard parameters in the previous protocol negotiation process. The GB / T 27930 protocol refers to the electric vehicle charging communication protocol defined by the Chinese national standard, which can be implemented by using the standard message format and parameter interaction process, and is used to forcibly establish a standardized communication channel when the non-standard protocol fails.

[0035] When all custom communication protocols fail to complete parameter negotiation, the charging pile actively triggers the protocol rollback mechanism. The initialization configuration operation of the communication module restores the parameters such as physical layer baud rate and data frame format to the default values of the national standard by erasing the temporary protocol parameters in the non-volatile memory. The initialized communication module generates a standard charging handshake message based on the GB / T 27930 protocol stack and sends a charging parameter request to the vehicle controller according to the timing specified by the national standard. After receiving the communication request conforming to the national standard, the vehicle controller returns response data containing basic parameters such as battery voltage and maximum allowable current. After analyzing the response data, the charging pile automatically matches the charging power according to the safety threshold specified by the national standard and starts the charging process conforming to the standard specification.

[0036] The charging pile monitors the charging state, communication state and plug-in signal in real time during the charging process. If any of the charging interruption, communication failure or plug-in signal abnormality is detected, the K3 and K4 relays and the plug-in confirmation switch are immediately disconnected, the charging is terminated, and the fault information is fed back.

[0037] The charging state refers to the real-time parameters of current and voltage during charging, which can be achieved by periodic sampling using current and voltage sensors, and is used to determine whether the charging is within the normal power output range. The communication state refers to the integrity of data interaction between the charging pile and the vehicle controller, which can be achieved by checking the response time of the message and the packet loss rate, and is used to identify whether the protocol communication link is interrupted. The plug-in signal refers to the physical connection state between the charging gun and the vehicle socket, which can be achieved by detecting the voltage change of the CC2 detection point, and is used to determine whether the plug-in is loose or fallen off.

[0038] Disconnecting the K3 and K4 relays refers to cutting off the main power supply circuit between the charging pile and the vehicle, which can be achieved by controlling the circuit to drive the relay coil to be powered off, and is used to quickly isolate the fault circuit. Disconnecting the plug-in confirmation switch refers to disconnecting the electrical connection confirmation signal between the charging gun and the vehicle socket, which can be achieved by the switch control module to cut off the confirmation signal loop, and is used to avoid the risk of electric arc caused by misoperation or poor contact.

[0039] Specifically, the charging pile continuously collects charging current and voltage data through the current sensor and voltage sensor during the charging process, and determines that the charging is interrupted when it detects that the current or voltage exceeds the preset threshold. At the same time, the communication module between the charging pile and the vehicle controller periodically sends heartbeat messages, and if it does not receive a response for three consecutive times or the data verification fails, it is determined that there is a communication failure. The plug-in signal monitoring module detects the voltage value of the CC2 detection point in real time, and if the voltage value jumps from U2 / 2 to U2, it is determined that the plug-in signal is abnormal. When any of the above abnormalities is triggered, the control unit of the charging pile immediately sends a disconnection instruction to the K3 and K4 relays, and simultaneously cuts off the power supply circuit of the plug-in confirmation switch, so that the charging main circuit and the confirmation signal circuit are disconnected at the same time, realizing double electrical isolation. The fault information is fed back through the human-machine interface of the charging pile or the remote monitoring platform, including the type of abnormality, the time of occurrence and specific parameters.

[0040] After the charging pile detects the charging signal, it closes the K3 and K4 relays to wake up the vehicle controller, and uses the first communication protocol to negotiate the charging parameters, including the following steps: immediately close the plug-in confirmation switch and detect the plug-in signal; after detecting the start charging signal, close the K3 and K4 relays to wake up the vehicle controller; use the first communication protocol to negotiate the charging parameters with the vehicle controller.

[0041] The plug-in confirmation switch is a circuit switch used to verify the physical connection of the charging gun and the vehicle socket, which can be realized by using an electromagnetic relay or a solid-state switch, and the closing action triggers the detection logic of the charging pile for the plug-in signal. The K3 and K4 relays are electromagnetic switch elements that control the on-off of the low-voltage auxiliary power supply between the charging pile and the vehicle controller, which can be realized by using a normally open type relay with a 12V DC control coil, and by closing the operation to supply power to the vehicle controller to activate its communication module. The first communication protocol is a pre-set highest priority communication protocol, which can be realized by using a custom message interaction mechanism based on CAN bus, and is used to match the communication needs of mainstream vehicle models in the charging handshake stage.

[0042] After detecting the charging signal, first, the connection state detection at the hardware level is triggered by closing the plug-in confirmation switch, at this time the charging pile continuously monitors the plug-in signal port level change. When the signal characteristics consistent with the vehicle socket insertion state are detected, the K3 and K4 relays are immediately closed to power the supply circuit of the vehicle controller, so that it is switched from the sleep state to the working mode. Then, the parameter negotiation request is sent to the vehicle controller through the preset first communication protocol, and the charging voltage and current parameters are interactively confirmed according to the time sequence requirements defined by the protocol. This process performs physical connection verification, controller wake-up and protocol negotiation operation in stages, avoiding communication failure caused by asynchronous timing of signal detection and controller wake-up.

[0043] The preset time for re-closing the plug-in confirmation switch and K3, K4 relays is 3-5 seconds after the K3, K4 relays and the plug-in confirmation switch are opened.

[0044] The preset time is the time interval from the completion of the opening operation to the start of the re-closing operation, which can be realized by a timer module or a delay circuit. The time window is used to ensure that the electrical elements fully release residual charge and complete state reset. The opening operation is the action of disconnecting the contacts by cutting off the power supply of the relay coil, which can be realized by an electromagnetic relay driving circuit and is used to eliminate the current path in the charging circuit. The re-closing operation is the action of reconnecting the contacts by restoring the power supply of the relay coil, which can be realized by a pulse trigger circuit and is used to rebuild the charging circuit and start the next round of protocol negotiation.

[0045] Specifically, when the charging pile detects that the current communication protocol negotiation fails or times out, the control module immediately cuts off the power supply of K3, K4 relays and opens the plug-in confirmation switch, so that the charging circuit is in a complete power-off state. At this time, the timer starts counting, and after a delay of 3-5 seconds, the control module re-outputs the closing instruction to make the plug-in confirmation switch and K3, K4 relays resume conduction in turn. In this process, the design of the preset time window enables the power management unit of the vehicle controller to complete capacitor discharge and logic reset, while avoiding the surge current caused by instantaneous repeated on-off from causing erosion to the relay contacts.

[0046] The charging pile detects the plug-in signal through CC1, and the vehicle controller detects the point voltage value; when the CC2 detection point voltage is U2, the charging gun is not inserted into the vehicle socket; when the CC2 detection point voltage is U2 / 2, the charging gun has been inserted into the vehicle socket; wherein U2 is the standard reference voltage of the vehicle controller, as shown in Figure 2 .

[0047] The CC2 detection point refers to the electrical signal detection interface between the charging gun connector and the vehicle socket, which can be realized by a voltage sampling module and a voltage sampling module, and is used to obtain the physical signal of the charging gun insertion state. U2 refers to the reference voltage signal output by the vehicle controller, which can be realized by a voltage stabilizing circuit or a reference voltage source, and is used to establish a unified reference for plug-in state judgment. U2 / 2 refers to the voltage value formed by the division after the charging gun is fully inserted, which can be realized by setting a voltage dividing resistor equivalent to the vehicle controller inside the charging pile, and is used to represent the electrical characteristics of mechanical connection completion.

[0048] When the charging gun is not inserted, the CC2 detection point is directly conducted with the vehicle controller, and the voltage detected at this time is the standard reference voltage U2 output by the controller. When the charging gun is fully inserted into the vehicle socket, the voltage dividing circuit inside the charging pile forms a loop with the vehicle controller, and the voltage at the CC2 detection point is reduced to U2 / 2 through equivalent resistance voltage division. The step change of this voltage value is captured by the voltage sampling module of the vehicle controller, and the physical connection state of the gun insertion action can be accurately judged. The vehicle will only start the subsequent communication process when the U2 / 2 voltage is detected, thereby avoiding false operation caused by virtual connection or poor contact.

[0049] Embodiment 2 A communication control system for a direct-current charging pile for multiple vehicles, comprising: A detection unit for closing the gun insertion confirmation switch and detecting the gun insertion signal after the charging pile detects that the charging gun is inserted into the vehicle socket; a first negotiation unit for closing the K3 and K4 relays to wake up the vehicle controller after the charging pile detects the charging signal, and using a first communication protocol to negotiate charging parameters; a judgment unit for disconnecting the K3 and K4 relays and the gun insertion confirmation switch if the first communication protocol fails to negotiate charging parameters or times out; a second negotiation unit for re-closing the gun insertion confirmation switch and the K3 and K4 relays within a preset time, and using the second to nth communication protocols to repeatedly negotiate charging parameters in sequence after detecting the charging signal, and disconnecting the K3 and K4 relays and the gun insertion confirmation switch each time the negotiation fails or times out; and a charging unit for using the GB / T 27930 protocol to charge after the nth protocol negotiation fails, and performing a corresponding protocol charging process if any of the charging parameter negotiations is successful.

[0050] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A communication control method for a direct current charging station for a plurality of vehicles, characterized by, The method comprises the following steps: After the charging pile detects that the charging gun is inserted into the vehicle socket, the plug-in gun confirmation switch is closed and the plug-in gun signal is detected; After the charging pile detects the charging signal, the K3 and K4 relays are closed to wake up the vehicle controller, and the first communication protocol is used for charging parameter negotiation; If the first communication protocol fails or times out in charging parameter negotiation, the K3 and K4 relays and the plug-in gun confirmation switch are disconnected; The plug-in gun confirmation switch and the K3 and K4 relays are re-closed within a preset time, and after the charging signal is detected, the second to nth communication protocols are used in turn to repeat the charging parameter negotiation, and the K3 and K4 relays and the plug-in gun confirmation switch are disconnected each time the negotiation fails or times out; After the nth protocol negotiation fails, the GB / T 27930 protocol is used for charging, and any successful charging parameter negotiation is executed according to the corresponding protocol charging process.

2. The communication control method of the direct-current charging pile for multiple vehicles according to claim 1, characterized in that: The first communication protocol, the second communication protocol,..., and the nth communication protocol are arranged in order of priority from high to low; When the high-priority communication protocol negotiation is successful, all low-priority communication protocols are skipped.

3. The communication control method of the direct-current charging pile for multiple vehicles according to claim 2, characterized in that: During the process of using the second to nth communication protocols in turn to repeat the charging parameter negotiation, after the plug-in gun confirmation switch and the K3 and K4 relays are re-closed each time, the charging pile first re-detects the charging signal; When the charging signal is detected, the current communication protocol is used for charging parameter negotiation with the vehicle controller.

4. The communication control method of the direct-current charging pile for multiple vehicles according to claim 3, characterized in that: When the charging parameter negotiation is performed using a certain communication protocol, if communication timeout occurs, the charging pile immediately stops the current protocol negotiation, records the failure, disconnects the K3 and K4 relays and the plug-in gun confirmation switch, re-closes the plug-in gun confirmation switch and the K3 and K4 relays after a preset time, and switches to the next priority communication protocol for charging parameter negotiation.

5. The communication control method of claim 4, wherein After the nth protocol negotiation fails, the GB / T 27930 protocol is used for charging, comprising the following steps: According to the GB / T 27930 standard, the initialization configuration of the communication module of the charging pile is performed; The GB / T 27930 protocol after the initialization configuration is used for charging parameter negotiation with the vehicle controller, and charging is performed.

6. The communication control method of the direct-current charging pile for multiple vehicles according to claim 5, characterized in that: The charging pile monitors the charging state, the communication state, and the plug-in gun signal in real time during charging; If any of the charging interruption, communication failure, or plug-in gun signal abnormality is monitored, the K3 and K4 relays and the plug-in gun confirmation switch are immediately disconnected, the charging is terminated, and the fault information is fed back.

7. The direct current charging pile multi-vehicle communication control method according to claim 6, characterized in that, After the charging pile detects the charging signal, the K3 and K4 relays are closed to wake up the vehicle controller, and the first communication protocol is used for charging parameter negotiation, comprising the following steps: The plug-in gun confirmation switch is immediately closed to detect the plug-in gun signal; After the start charging signal is detected, the K3 and K4 relays are closed to wake up the vehicle controller; The first communication protocol is used for charging parameter negotiation with the vehicle controller.

8. The communication control method of the DC charging pile for multiple vehicles according to claim 7, characterized in that: The preset time for re-closing the plug-in confirmation switch and the K3 and K4 relays after the K3 and K4 relays and the plug-in confirmation switch are disconnected is 3-5 seconds.

9. The communication control method of the DC charging pile for multiple vehicles according to claim 8, characterized in that: The charging pile detects the plug-in signal through CC1, and the vehicle controller judges through the detection of the point voltage value by CC2; When the point voltage value detected by CC2 is U2, the charging gun is not inserted into the vehicle socket; When the point voltage value detected by CC2 is U2 / 2, the charging gun is inserted into the vehicle socket; Wherein, U2 is the standard reference voltage of the vehicle controller.

10. A communication control system for a direct current charging station for multiple vehicles, characterized by, Comprise: A detection unit for closing the plug-in confirmation switch and detecting the plug-in signal after the charging pile detects that the charging gun is inserted into the vehicle socket; A first negotiation unit for closing the K3 and K4 relays to wake up the vehicle controller after the charging pile detects the charging signal, and using the first communication protocol to negotiate the charging parameters; A judgment unit for disconnecting the K3 and K4 relays and the plug-in confirmation switch if the first communication protocol fails to negotiate the charging parameters or times out; A second negotiation unit for re-closing the plug-in confirmation switch and the K3 and K4 relays within the preset time, and using the second to nth communication protocols in turn to repeatedly negotiate the charging parameters after detecting the charging signal, and disconnecting the K3 and K4 relays and the plug-in confirmation switch each time the negotiation fails or times out; A charging unit for using the GB / T 27930 protocol to charge after the nth protocol negotiation fails, and executing the corresponding protocol charging process if any of the charging parameter negotiations succeeds.

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