Standard standard-to-European standard direct current charging adapter and control method

Abstract

According to the national standard-to-European standard direct current charging adapter and the control method provided by the invention, after the direct current charging adapter is used, a national standard charging pile and an European standard vehicle do not need to be changed. The adapter converts a national standard charging pile CAN communication protocol into an European standard PLC charging communication protocol, and the national standard charging gun head is converted into a CCS2 European standard gun head, so that the function of charging an European standard vehicle by the national standard charging pile is realized. No matter the national standard charging pile is directly exported to European or the European standard original electric vehicle is directly imported in China, the electric vehicle can be charged. Therefore, the problem that the national standard charging pile exits European and cannot charge the European standard vehicle is solved, and the problem that the imported European standard original electric vehicle cannot be charged by the national standard direct current pile is also solved. The method is economical, practical, effective and reliable. The DC charging adapter is safe and convenient to use and convenient to carry. The adapter can be compatible with various brands of European standard electric vehicles and national standard direct current charging piles by using the same version of software, and is good in compatibility and adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to a national standard to European standard direct current charging adapter and a control method thereof. Background Art

[0002] From 00:00 on July 1, 2023, the "Hong Kong cars going north" policy will be officially implemented. The first batch of Hong Kong private cars with license plates can enter Guangdong from the Zhuhai highway port of the Hong Kong-Zhuhai-Macao Bridge and enjoy more convenient travel in the Guangdong-Hong Kong-Macao Greater Bay Area. "Hong Kong cars going north" refers to Hong Kong private cars entering and leaving Guangdong via the Zhuhai highway port of the Hong Kong-Zhuhai-Macao Bridge. The purpose is to further facilitate the travel of people and vehicles between Guangdong and Macao. It is estimated that about 450,000 Hong Kong car owners will benefit. Some of the cars going north to the mainland are electric vehicles. Since Hong Kong electric vehicles follow the European standard, these electric vehicles face the problem of not being able to use national standard piles for DC charging when they come to the mainland.

[0003] In addition, the current global sales of new energy vehicles continue to grow, and charging piles, as one of the important infrastructures of new energy vehicles, have also seen an increase in market demand. According to forecasts, by the end of 2023, the number of new energy vehicles in China will reach 21.05 million, and will increase to 40.28 million by the end of 2025. Under the active promotion of national policies, assuming that the car-to-pile ratio continues to decline year by year, the car-to-pile ratio will drop to 2:1 by 2025. Not only has the charging pile industry performed strongly in the domestic market, but the international market has also shown broad development space. Compared with China, the construction of charging infrastructure in Europe and the United States lags behind and the car-to-pile ratio is relatively low. As of the end of 2022, China's public charging pile car-to-pile ratio was 7.3, while the United States and Europe were 23.1 and 12.7 respectively during the same period, which is still a huge gap compared to the target car-to-pile ratio of 1:1. Therefore, charging piles have broad market prospects in Europe. However, national standard DC charging piles cannot charge European standard electric vehicles, and therefore cannot be directly exported to Europe.

[0004] It can be seen from this that whether Hong Kong's European standard electric vehicles are heading north to the mainland, or national standard DC charging piles are exported to Europe, the practical problem of using national standard DC charging piles to charge European standard electric vehicles needs to be solved.

[0005] Since the national standard DC charging and the European standard DC charging are different not only in the physical interface of the charging connector, but also in the communication protocol standards, the European standard DC charging follows the PLC communication of the DIN70121 protocol standard and the ISO15118 protocol standard, while the national standard DC charging follows the CAN communication of GB / T27930-2015.

[0006] If the national standard DC charging pile is converted into the European standard DC charging pile through transformation, it is necessary not only to replace the charging gun head, but also to purchase a dedicated protocol conversion module European standard charger communication controller SECC, and to adapt, develop and debug the charging pile master control software. This not only consumes manpower and financial resources, but also requires a lot of time, and the R&D cycle is not easy to control. Similarly, electric vehicles with European standard charging interfaces not only need to be replaced with national standard charging sockets, but also remove the European standard electric vehicle communication control module EVCC, and implement the GB / T27930-2015 protocol before they can be converted into national standard electric vehicles.

[0007] Obviously, the above methods are not the best solution to solve the problem of charging European standard electric vehicles with national standard DC charging piles. There is an urgent need for a convenient and fast conversion device that does not require any changes to the European standard car or the national standard pile, and is easy to carry, so that the national standard DC pile can charge the European standard electric vehicle. Summary of the invention

[0008] The purpose of the present invention is to provide a national standard to European standard DC charging adapter and control method, which can convert the national standard charging pile CAN communication protocol into the European standard PLC charging communication protocol, thereby realizing the function of the national standard charging pile charging a European standard car.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is: A national standard to European standard DC charging adapter, comprising a national standard charging seat, a conversion plate, and a European standard charging gun, wherein the conversion plate comprises: A+, A- signal interface: used to power the conversion board after plugging into the national standard charging pile; CANH, CANL signal interface: used for CAN communication connection between national standard charging pile and conversion board; CC1 signal interface: used to control the communication between the national standard charging pile and the conversion board to connect or disconnect; CP signal interface, used for PLC communication connection between the conversion board and the European standard charging gun and output high impedance state to simulate gun removal; PP signal interface: used to control the conversion board and the European standard charging gun to connect or disconnect; PE signal interface: used for grounding of conversion board, European standard charging gun, and national standard charging pile; DC+, DC- signal interface: The internal boost module of the adapter simulates the high voltage output and voltage sampling interface.

[0010] Preferably, the adapter further includes a battery, a start button and an operation indicator light, and the conversion board further includes: Battery interface: used for external battery; Button and light interface: used for external start button and operation indicator light.

[0011] Preferably, the conversion plate further comprises: USBHOST interface: used to connect an external USB flash drive for software upgrades and log downloads.

[0012] A control method for a national standard to European standard DC charging adapter comprises the following steps: Step 1: Physically connect the adapter to the national standard charging pile and the European standard car respectively, and start the adapter; Step 2: The adapter and the EVCC of the European standard vehicle conduct a PLC communication interaction, including going through the SLAC and SDP stages to establish a TCP connection, exchange V2G messages to obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the drawing of a gun, and obtain the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 3: The adapter disconnects the TCP connection with the EVCC of the European standard vehicle, but the adapter is still physically connected to the European standard vehicle; Step 4: The adapter communicates with the national standard charging pile through CAN. The adapter replies to the national standard charging pile with the highest charging voltage obtained in the first PLC communication between the adapter and the EVCC of the European standard car. The national standard charging pile performs insulation testing. Step 5: The adapter conducts a second PLC communication with the EVCC of the European standard vehicle, and the parameter discovery phase message of the EVCC of the European standard vehicle is synchronized with the CML message of the national standard charging pile; Step 6: The EVCC of the European standard vehicle starts to send a pre-charge request message, and the adapter monitors the high-voltage output and outputs the voltage; the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified and enters the European standard charging stage; the adapter turns off the simulated high-voltage output and sends a message to the national standard charging pile. After the national standard charging pile detects the battery voltage at the vehicle end, it starts to raise the voltage and performs the national standard pre-charge.

[0013] Preferably, in step 1, the national standard gun head of the national standard charging pile is connected to the national standard charging seat of the adapter, and then the European standard gun head of the adapter is connected to the charging seat of the European standard car, and the start button of the adapter is clicked to start the adapter. At this time, the PP resistor and CC1 resistor of the adapter are in the disconnected state.

[0014] Preferably, step 2 comprises the following steps: Step 21, the CP signal of the European standard gun head of the adapter outputs a 100% duty cycle, and the PP resistor is turned on, simulating the European standard gun insertion action; Step 22: wake up the European standard vehicle. The adapter detects that the CP state is B and starts to output a 5% duty cycle on the CP signal. Step 23: The EVCC of the European standard vehicle detects a 5% duty cycle of the CP signal and starts to initiate a SLAC connection. The adapter and the EVCC of the European standard vehicle interact through the SLAC and SDP stages, establish a TCP connection, and enter the V2G message interaction stage. Step 24, the EVCC of the European standard car sends a protocol handshake request message SupportedAppProtocolReq, and the adapter replies with a SupportedAppProtocolRes message indicating a successful handshake; the EVCC of the European standard car sends a session establishment message SessionSetupReq, and the adapter replies with a SessionSetupRes message to establish a session; the EVCC of the European standard car and the adapter go through the ServiceDiscovery phase, the Service and payment selection ServicePaymentSelection phase, and enter the ContractAuthentication phase of V2G message interaction; Step 25: After the authorization is completed, the adapter and the EVCC of the European standard vehicle interact in the parameter discovery ChargeParameterDiscovery phase; then, the adapter and the EVCC of the European standard vehicle interact in the insulation detection CableCheck phase; after the insulation detection phase is completed, the adapter and the EVCC of the European standard vehicle interact in the pre-charge PreCharge phase, and the adapter obtains the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 26: In the PreChargeRes message replied by the adapter, the parameter EVSEStausCode is filled with EVSE_SHUTDOWN, and the ResponseCode is filled with FAILED, thus ending the first PLC interaction process between the EVCC of the European standard vehicle and the adapter.

[0015] Preferably, step 3 comprises the following steps: Step 31, the adapter waits for 200ms and disconnects the TCP connection with the EVCC of the European standard vehicle; Step 32, after the adapter waits for the connection to be disconnected, the PP resistor is disconnected, the CP duty cycle output is turned off, and the EVCC of the European standard vehicle detects the gun-pulling state, but the adapter is actually physically still in the charging socket of the European standard vehicle; Step 33: The adapter and the EVCC of the European standard vehicle go through the SLAC and SDP stages for the first time to establish a TCP connection, exchange V2G messages, obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the gun drawing. If any step fails, the charging fails.

[0016] Preferably, step 4 comprises the following steps: Step 41: When the adapter is ready to communicate with the national standard charging pile, the CC1 resistor is turned on to simulate the national standard charging gun signal. The national standard charging pile detects the charging gun signal, outputs the A+ signal, and sends the CHM message. Step 42, after the adapter detects the A+ signal and receives the CHM message, it starts to reply the BHM message to the national standard charging pile; the maximum voltage parameter in the BHM message is filled with the value obtained by the first PLC communication between the adapter and the EVCC of the European standard car; after the national standard charging pile receives the BHM message, it starts insulation detection; Step 43: When the insulation test of the national standard charging pile is completed and the insulation test result is normal, the national standard charging pile sends a CRM0x00 message that the BMS cannot recognize; if the insulation test of the national standard charging pile is abnormal, or the insulation test is not completed within the time limit, the adapter terminates the charging process; if the adapter has received the CRM0x00 message that the BMS cannot recognize from the national standard charging pile, it replies with a BRM message.

[0017] Preferably, the step 5 comprises the following steps: Step 51, the adapter performs the second PLC communication with the European standard vehicle, the adapter outputs 100% duty cycle, connects the PP resistor to simulate the European standard plug-in signal, and wakes up the vehicle; Step 52, when the adapter detects that the CP state is B, it starts to output a 5% duty cycle; the adapter and the EVCC of the European standard vehicle interact through the European standard SLAC and SDP stages to establish a TCP connection; then the V2G message interaction is carried out, and the protocol handshake stage, session establishment stage, service discovery stage, service and payment method selection stage, authorization stage, and parameter discovery stage are sequentially passed; in the parameter discovery stage, the national standard CML and CTS messages will be waited for and synchronized; Step 53: After the adapter receives the CRM 0xAA BMS-recognizable message sent by the national standard charging pile, it starts to send the BCP message; the limit parameters and battery voltage parameters in the BCP message are filled in with the values ​​obtained by the first PLC communication between the adapter and the European standard vehicle; Step 54. After the adapter receives the CML and CTS messages sent by the national standard charging pile, it starts to send the BRO 0x00BMS message indicating that it is not ready for charging, and fills the limit parameters of the national standard charging pile obtained in the CML message into the corresponding parameters of the ChargeParameterDiscoveryRes message and sends it to the EVCC of the European standard vehicle, completing the synchronization of the parameter discovery phase message of the EVCC of the European standard vehicle with the CML message of the national standard charging pile. If the adapter does not receive the CML and CTS messages sent by the national standard charging pile, it will continue to interact with the EVCC of the European standard vehicle in the parameter discovery phase.

[0018] Preferably, step 6 comprises the following steps: Step 61, the adapter and the EVCC of the European standard vehicle complete the message exchange in the insulation detection phase, and the EVCC of the European standard vehicle starts to send the pre-charge request message PreChargeReq; after receiving the PreChargeReq message, the adapter starts the analog high-voltage output, and the output voltage is the target voltage in the pre-charge request message PreChargeReq; the adapter starts to monitor the voltage output to DC+ and DC-, and fills the voltage value filled in by the measured value into the corresponding parameter of PreChargeRes and sends it to the EVCC of the European standard vehicle; Step 62: When the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified, the vehicle-side contactor is closed, the vehicle-side sends a PowerDeliveryReq message, and the adapter replies with a PowerDeliveryRes message, and the European standard charging phase CurrentDemand message interaction begins; at this time, for the national standard charging pile, it is equivalent to the vehicle closing the K5 and K6 contactors, and there is a high-voltage output on the gun line port. The adapter turns off the analog high-voltage output of the internal boost module, that is, the boost module output is 0 at this time, and sends a BRO 0xAA BMS message to the national standard charging pile to complete the charging preparation; Step 63: After receiving the BRO 0xAA BMS charging preparation completion message sent by the adapter, the national standard charging pile starts to send the CRO 0x00 charger charging preparation completion message; after detecting the battery voltage at the vehicle end, the national standard charging pile starts to raise the voltage and performs national standard pre-charging; at this time, the adapter interacts with the EVCC of the European standard vehicle in the charging phase CurrentDemand message, and the adapter replies to the CurrentDemandRes message of the EVCC of the European standard vehicle, with the current voltage PresentVoltage filled in as the battery voltage, and the current current PresentCurrent filled in as 0; Step 64: When the national standard charging pile has completed the boost and pre-charging, close the K1 and K2 contactors and send a CRO 0xAA message indicating that the charger has completed charging preparation; after receiving the CRO 0xAA message indicating that the charger has completed charging preparation, the adapter sends BCL and BCS messages; after receiving the BCL and BCS messages, the national standard charging pile starts to send CCS messages; after receiving the CCS message, the adapter periodically sends BCL, BCS, and BSM messages, and fills the current voltage and current values ​​in the CCS message into the current voltage and current current parameters in the CurrentDemandRes message; Step 65. When the European standard car is fully charged, the EVCC of the European standard car sends a PowerDeliveryReq message to terminate the charging session, and the adapter replies with a PowerDeliveryRes message to the European standard car. At the same time, the adapter sends a BST message to the national standard charging pile. The adapter and the EVCC of the European standard car end the European standard charging session after the WeldingDetection and SessionStop stages. The adapter receives the CST message sent by the national standard charging pile and sends a BSD message, waiting for the CSD message sent by the pile. The adapter receives the CSD message from the pile and the charging is completed.

[0019] The beneficial effects of the present invention are: This scheme proposes a DC charging adapter and control method for converting national standard to European standard. After using the DC charging adapter, no changes are needed for either national standard charging piles or European standard vehicles. The adapter converts the CAN communication protocol of the national standard charging pile to the PLC charging communication protocol of the European standard, and the national standard charging gun head to the CCS2 European standard gun head, thus realizing the function of charging the national standard charging pile for the European standard vehicle. Whether the national standard charging pile is directly exported to Europe, or the original European standard electric vehicle is directly imported into China, it can be charged. This not only solves the problem of national standard charging piles exported to Europe to charge vehicles that cannot meet European standards, but also solves the problem that imported original European standard electric vehicles cannot be charged with national standard DC piles. It is not only economical, but also effective and reliable. The DC charging adapter is safe, convenient and easy to use, and easy to carry. The adapter is compatible with multiple brands of European standard electric vehicles and national standard DC charging piles using the same version of software, and has good compatibility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 FIG. 4 is a diagram showing the composition structure of the adapter of the present invention.

[0022] Figure 2 This is a usage scenario diagram of the adapter of the present invention.

[0023] Figure 3 This is a communication control timing diagram of the first PLC communication interaction between the adapter of the present invention and the EVCC of a European standard vehicle.

[0024] Figure 4 This is a communication control timing diagram of the second PLC communication interaction between the adapter of the present invention and the EVCC of a European standard vehicle. DETAILED DESCRIPTION

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

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0027] At the same time, it should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be the ordinary meaning understood by people with ordinary skills in the technical field to which the present invention belongs. The meaning of "multiple" used in the patent application specification and claims of the present invention is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front end", "rear end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] The present invention is further described in detail below in conjunction with embodiments and with reference to the accompanying drawings.

[0029] The present invention discloses a DC charging adapter that converts national standards to European standards. Figure 1 , 2 As shown, the embodiment includes a national standard charging base, a conversion board, a European standard charging gun, a battery, a start button and an operation indicator light, and the conversion board includes: A+, A- signal interface: National standard charging pile auxiliary power interface, which supplies power to the conversion board after inserting the national standard charging gun; CANH, CANL signal interface: national standard charging pile CAN communication interface, isolated from the internal circuit; CC1 signal interface: 1K resistor is grounded, connected by default, and can be controlled to be disconnected; CP signal interface, including PWM output, state sampling and PLC communication. CP can output high impedance state to simulate drawing a gun; PP signal interface: 1.5K resistor grounded, connected by default, can be controlled to be disconnected, used to simulate gun drawing and voltage sampling; PE signal interface: protection ground interface, used for the ground loop of PLC signal and the ground loop of CC1 signal; DC+, DC- signal interface: The internal boost module of the adapter simulates high voltage output and voltage sampling interface, which is isolated from the internal circuit. The analog DC voltage output range is 0-1000V, the maximum output current is 20mA, and the voltage measurement range is 0-1000V; Battery interface: used for external battery; Button and light interface: used for external start button and operation indicator light; USBHOST interface: used to connect an external USB flash drive for software upgrades and log downloads.

[0030] The national standard gun head of the national standard charging pile is connected to the national standard charging seat of the adapter, and the European standard gun head of the adapter is connected to the charging seat of the European standard car. The adapter communicates with the EVCC of the European standard car through CP and PE for PLC, and the communication protocol is European standard DIN70121 or ISO15118-2. The adapter communicates with the national standard charging pile through CANH and CANL for CAN communication, and the communication protocol is national standard GB / T27930-2015.

[0031] During the charging process, one end of the adapter is connected to the national standard charging pile, and the other end is connected to the European standard car. When the national standard charging pile and the adapter perform national standard communication, the adapter plays the role of the national standard charging pile BMS; when the European standard car and the adapter perform European standard communication, the adapter plays the role of the European standard car SECC.

[0032] The present invention discloses a control method for a national standard to European standard DC charging adapter, comprising the following steps: Step 1: Physically connect the adapter to the national standard charging pile and the European standard car respectively, and start the adapter; Step 2: The adapter and the EVCC of the European standard vehicle conduct a PLC communication interaction, including going through the SLAC and SDP stages to establish a TCP connection, exchange V2G messages to obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the drawing of a gun, and obtain the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 3: The adapter disconnects the TCP connection with the EVCC of the European standard vehicle, but the adapter is still physically connected to the European standard vehicle; Step 4: The adapter communicates with the national standard charging pile through CAN. The adapter replies to the national standard charging pile with the highest charging voltage obtained in the first PLC communication between the adapter and the EVCC of the European standard car. The national standard charging pile performs insulation testing. Step 5: The adapter conducts a second PLC communication with the EVCC of the European standard vehicle, and the parameter discovery phase message of the EVCC of the European standard vehicle is synchronized with the CML message of the national standard charging pile; Step 6: The EVCC of the European standard vehicle starts to send a pre-charge request message, and the adapter monitors the high-voltage output and outputs the voltage; the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified and enters the European standard charging stage; the adapter turns off the simulated high-voltage output and sends a message to the national standard charging pile. After the national standard charging pile detects the battery voltage at the vehicle end, it starts to raise the voltage and performs the national standard pre-charge.

[0033] In step 1, the national standard gun head of the national standard charging pile is connected to the national standard charging seat of the adapter, and then the European standard gun head of the adapter is connected to the charging seat of the European standard car, and the start button of the adapter is clicked to start the adapter. At this time, the PP resistor and CC1 resistor of the adapter are in the disconnected state.

[0034] The step 2 comprises the following steps: Step 21, the CP signal of the European standard gun head of the adapter outputs a 100% duty cycle, and the PP resistor is turned on, simulating the European standard gun insertion action; Step 22: wake up the European standard vehicle. The adapter detects that the CP state is B and starts to output a 5% duty cycle on the CP signal. Step 23: The EVCC of the European standard vehicle detects a 5% duty cycle of the CP signal and starts to initiate a SLAC connection. The adapter and the EVCC of the European standard vehicle interact through the SLAC and SDP stages, establish a TCP connection, and enter the V2G message interaction stage. Step 24, the EVCC of the European standard car sends a protocol handshake request message SupportedAppProtocolReq, and the adapter replies with a SupportedAppProtocolRes message indicating a successful handshake; the EVCC of the European standard car sends a session establishment message SessionSetupReq, and the adapter replies with a SessionSetupRes message to establish a session; the EVCC of the European standard car and the adapter go through the ServiceDiscovery phase, the Service and payment selection ServicePaymentSelection phase, and enter the ContractAuthentication phase of V2G message interaction; Step 25: After the authorization is completed, the adapter and the EVCC of the European standard vehicle interact in the parameter discovery ChargeParameterDiscovery phase; then, the adapter and the EVCC of the European standard vehicle interact in the insulation detection CableCheck phase; after the insulation detection phase is completed, the adapter and the EVCC of the European standard vehicle interact in the pre-charge PreCharge phase, and the adapter obtains the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 26: In the PreChargeRes message replied by the adapter, the parameter EVSEStausCode is filled with EVSE_SHUTDOWN, and the ResponseCode is filled with FAILED, thus ending the first PLC interaction process between the EVCC of the European standard vehicle and the adapter.

[0035] The step 3 comprises the following steps: Step 31, the adapter waits for 200ms and disconnects the TCP connection with the EVCC of the European standard vehicle; Step 32, after the adapter waits for the connection to be disconnected, the PP resistor is disconnected, the CP duty cycle output is turned off, and the EVCC of the European standard vehicle detects the gun-pulling state, but the adapter is actually physically still in the charging socket of the European standard vehicle; Step 33: The adapter and the EVCC of the European standard vehicle go through the SLAC and SDP stages for the first time to establish a TCP connection, exchange V2G messages, obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the gun drawing. If any step fails, the charging fails.

[0036] The step 4 comprises the following steps: Step 41: When the adapter is ready to communicate with the national standard charging pile, the CC1 resistor is turned on to simulate the national standard charging gun signal. The national standard charging pile detects the charging gun signal, outputs the A+ signal, and sends the CHM message. Step 42, after the adapter detects the A+ signal and receives the CHM message, it starts to reply the BHM message to the national standard charging pile; the maximum voltage parameter in the BHM message is filled with the value obtained by the first PLC communication between the adapter and the EVCC of the European standard car; after the national standard charging pile receives the BHM message, it starts insulation detection; Step 43: When the insulation test of the national standard charging pile is completed and the insulation test result is normal, the national standard charging pile sends a CRM0x00 message that the BMS cannot recognize; if the insulation test of the national standard charging pile is abnormal, or the insulation test is not completed within the time limit, the adapter terminates the charging process; if the adapter has received the CRM0x00 message that the BMS cannot recognize from the national standard charging pile, it replies with a BRM message.

[0037] The step 5 comprises the following steps: Step 51, the adapter performs the second PLC communication with the European standard vehicle, the adapter outputs 100% duty cycle, connects the PP resistor to simulate the European standard plug-in signal, and wakes up the vehicle; Step 52, when the adapter detects that the CP state is B, it starts to output a 5% duty cycle; the adapter and the EVCC of the European standard vehicle interact through the European standard SLAC and SDP stages to establish a TCP connection; then the V2G message interaction is carried out, and the protocol handshake stage, session establishment stage, service discovery stage, service and payment method selection stage, authorization stage, and parameter discovery stage are sequentially passed; in the parameter discovery stage, the national standard CML and CTS messages will be waited for and synchronized; Step 53: After the adapter receives the CRM 0xAA BMS-recognizable message sent by the national standard charging pile, it starts to send the BCP message; the limit parameters and battery voltage parameters in the BCP message are filled in with the values ​​obtained by the first PLC communication between the adapter and the European standard vehicle; Step 54. After the adapter receives the CML and CTS messages sent by the national standard charging pile, it starts to send the BRO 0x00BMS message indicating that it is not ready for charging, and fills the limit parameters of the national standard charging pile obtained in the CML message into the corresponding parameters of the ChargeParameterDiscoveryRes message and sends it to the EVCC of the European standard vehicle, completing the synchronization of the parameter discovery phase message of the EVCC of the European standard vehicle with the CML message of the national standard charging pile. If the adapter does not receive the CML and CTS messages sent by the national standard charging pile, it will continue to interact with the EVCC of the European standard vehicle in the parameter discovery phase.

[0038] The step 6 comprises the following steps: Step 61, the adapter and the EVCC of the European standard vehicle complete the message exchange in the insulation detection phase, and the EVCC of the European standard vehicle starts to send the pre-charge request message PreChargeReq; after receiving the PreChargeReq message, the adapter starts the analog high-voltage output, and the output voltage is the target voltage in the pre-charge request message PreChargeReq; the adapter starts to monitor the voltage output to DC+ and DC-, and fills the voltage value filled in by the measured value into the corresponding parameter of PreChargeRes and sends it to the EVCC of the European standard vehicle; Step 62: When the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified, the vehicle-side contactor is closed, the vehicle-side sends a PowerDeliveryReq message, and the adapter replies with a PowerDeliveryRes message, and the European standard charging phase CurrentDemand message interaction begins; at this time, for the national standard charging pile, it is equivalent to the vehicle closing the K5 and K6 contactors, and there is a high-voltage output on the gun line port. The adapter turns off the analog high-voltage output of the internal boost module, that is, the boost module output is 0 at this time, and sends a BRO 0xAA BMS message to the national standard charging pile to complete the charging preparation; Step 63: After receiving the BRO 0xAA BMS charging preparation completion message sent by the adapter, the national standard charging pile starts to send the CRO 0x00 charger charging preparation completion message; after detecting the battery voltage at the vehicle end, the national standard charging pile starts to raise the voltage and performs national standard pre-charging; at this time, the adapter interacts with the EVCC of the European standard vehicle in the charging phase CurrentDemand message, and the adapter replies to the CurrentDemandRes message of the EVCC of the European standard vehicle, with the current voltage PresentVoltage filled in as the battery voltage, and the current current PresentCurrent filled in as 0; Step 64: When the national standard charging pile has completed the boost and pre-charging, close the K1 and K2 contactors and send a CRO 0xAA message indicating that the charger has completed charging preparation; after receiving the CRO 0xAA message indicating that the charger has completed charging preparation, the adapter sends BCL and BCS messages; after receiving the BCL and BCS messages, the national standard charging pile starts to send CCS messages; after receiving the CCS message, the adapter periodically sends BCL, BCS, and BSM messages, and fills the current voltage and current values ​​in the CCS message into the current voltage and current current parameters in the CurrentDemandRes message; Step 65. When the European standard car is fully charged, the EVCC of the European standard car sends a PowerDeliveryReq message to terminate the charging session, and the adapter replies with a PowerDeliveryRes message to the European standard car. At the same time, the adapter sends a BST message to the national standard charging pile. The adapter and the EVCC of the European standard car end the European standard charging session after the WeldingDetection and SessionStop stages. The adapter receives the CST message sent by the national standard charging pile and sends a BSD message, waiting for the CSD message sent by the pile. The adapter receives the CSD message from the pile and the charging is completed.

[0039] The use scenarios of the adapter are as follows: Figure 2As shown, the detailed operation steps for charging with the adapter are as follows: Step A: Press the power button to turn on the device, and the red indicator light starts to flash slowly; Step B: Confirm whether the internal battery is fully charged. If the indicator light can flash for 30 seconds without going out, the battery is fully charged, otherwise the internal battery needs to be charged; Step C: Insert the European standard CCS2 gun head plug of the adapter into the vehicle; Step D: Insert the national standard charging gun into the national standard interface of the adapter; Step E: Wait for the indicator light to flash quickly, flashing 3 times per second; Step F: Swipe the card on the national standard charging pile to start charging. If the card is not swiped for more than 2 minutes after the prompt to swipe the card to charge, the charging will fail; Step G: After the charging is successfully started, the indicator light becomes solid; Step H: Automatically stop when full, or manually terminate charging on the charging pile; Step I: After charging is completed, the indicator light becomes slow flashing and shuts down after a few seconds; Step J: In the slow flashing state, press the power button to shut down; Step K: If you need to charge again, do not unplug the charging adapter. After shutting down, press the power button again to start the device and start charging from step E.

[0040] It should be noted that the parts not described in detail in the above embodiments are all prior art.

[0041] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A DC charging adapter from national standard to European standard, characterized by: It includes a national standard charging base, a conversion plate, and a European standard charging gun. The conversion plate includes: A+, A- signal interface: used to power the conversion board after plugging into the national standard charging pile; CANH, CANL signal interface: used for CAN communication connection between national standard charging pile and conversion board; CC1 signal interface: used to control the communication between the national standard charging pile and the conversion board to connect or disconnect; CP signal interface, used for PLC communication connection between the conversion board and the European standard charging gun and output high impedance state to simulate gun removal; PP signal interface: used to control the conversion board and the European standard charging gun to connect or disconnect; PE signal interface: used for grounding of conversion board, European standard charging gun, and national standard charging pile; DC+, DC- signal interface: The internal boost module of the adapter simulates the high voltage output and voltage sampling interface.

2. The national standard to European standard DC charging adapter according to claim 1, characterized in that: It also includes a battery, a start button and an operating indicator light, and the conversion board also includes: Battery interface: used for external battery; Button and light interface: used for external start button and operation indicator light.

3. The national standard to European standard DC charging adapter according to claim 2, characterized in that: The conversion board also includes: USBHOST interface: used to connect an external USB flash drive for software upgrades and log downloads.

4. A control method for a national standard to European standard DC charging adapter, using the national standard to European standard DC charging adapter according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Physically connect the adapter to the national standard charging pile and the European standard car respectively, and start the adapter; Step 2: The adapter and the EVCC of the European standard vehicle conduct a PLC communication interaction, including going through the SLAC and SDP stages to establish a TCP connection, exchange V2G messages to obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the drawing of a gun, and obtain the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 3: The adapter disconnects the TCP connection with the EVCC of the European standard vehicle, but the adapter is still physically connected to the European standard vehicle; Step 4: The adapter communicates with the national standard charging pile through CAN. The adapter replies to the national standard charging pile with the highest charging voltage obtained in the first PLC communication between the adapter and the EVCC of the European standard car. The national standard charging pile performs insulation testing. Step 5: The adapter conducts a second PLC communication with the EVCC of the European standard vehicle, and the parameter discovery phase message of the EVCC of the European standard vehicle is synchronized with the CML message of the national standard charging pile; Step 6: The EVCC of the European standard vehicle starts to send a pre-charge request message, and the adapter monitors the high-voltage output and outputs the voltage; the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified and enters the European standard charging stage; the adapter turns off the simulated high-voltage output and sends a message to the national standard charging pile. After the national standard charging pile detects the battery voltage at the vehicle end, it starts to raise the voltage and performs the national standard pre-charge.

5. The control method of a national standard to European standard DC charging adapter according to claim 4, characterized in that: In step 1, the national standard gun head of the national standard charging pile is connected to the national standard charging seat of the adapter, and then the European standard gun head of the adapter is connected to the charging seat of the European standard car, and the start button of the adapter is clicked to start the adapter. At this time, the PP resistor and CC1 resistor of the adapter are in the disconnected state.

6. The control method of a national standard to European standard DC charging adapter according to claim 5, characterized in that: The step 2 comprises the following steps: Step 21, the CP signal of the European standard gun head of the adapter outputs a 100% duty cycle, and the PP resistor is turned on, simulating the European standard gun insertion action; Step 22: wake up the European standard vehicle. The adapter detects that the CP state is B and starts to output a 5% duty cycle on the CP signal. Step 23: The EVCC of the European standard vehicle detects a 5% duty cycle of the CP signal and starts to initiate a SLAC connection. The adapter and the EVCC of the European standard vehicle interact through the SLAC and SDP stages, establish a TCP connection, and enter the V2G message interaction stage. Step 24, the EVCC of the European standard car sends a protocol handshake request message SupportedAppProtocolReq, and the adapter replies with a SupportedAppProtocolRes message indicating a successful handshake; the EVCC of the European standard car sends a session establishment message SessionSetupReq, and the adapter replies with a SessionSetupRes message to establish a session; the EVCC of the European standard car and the adapter go through the ServiceDiscovery phase, the Service and payment selection ServicePaymentSelection phase, and enter the ContractAuthentication phase of V2G message interaction; Step 25: After the authorization is completed, the adapter and the EVCC of the European standard vehicle interact in the parameter discovery ChargeParameterDiscovery phase; then, the adapter and the EVCC of the European standard vehicle interact in the insulation detection CableCheck phase; after the insulation detection phase is completed, the adapter and the EVCC of the European standard vehicle interact in the pre-charge PreCharge phase, and the adapter obtains the vehicle-side related parameters required to fill the national standard BHM and BCP messages; Step 26: In the PreChargeRes message replied by the adapter, the parameter EVSEStausCode is filled with EVSE_SHUTDOWN, and the ResponseCode is filled with FAILED, thus ending the first PLC interaction process between the EVCC of the European standard vehicle and the adapter.

7. The control method of a national standard to European standard DC charging adapter according to claim 6, characterized in that: The step 3 comprises the following steps: Step 31, the adapter waits for 200ms and disconnects the TCP connection with the EVCC of the European standard vehicle; Step 32, after the adapter waits for the connection to be disconnected, the PP resistor is disconnected, the CP duty cycle output is turned off, and the EVCC of the European standard vehicle detects the gun-pulling state, but the adapter is actually physically still in the charging socket of the European standard vehicle; Step 33: The adapter and the EVCC of the European standard vehicle go through the SLAC and SDP stages for the first time to establish a TCP connection, exchange V2G messages, obtain vehicle-side parameters in the pre-charging stage, disconnect, and simulate the gun drawing. If any step fails, the charging fails.

8. The control method of a national standard to European standard DC charging adapter according to claim 7, characterized in that: The step 4 comprises the following steps: Step 41: When the adapter is ready to communicate with the national standard charging pile, the CC1 resistor is turned on to simulate the national standard charging gun signal. The national standard charging pile detects the charging gun signal, outputs the A+ signal, and sends the CHM message. Step 42, after the adapter detects the A+ signal and receives the CHM message, it starts to reply the BHM message to the national standard charging pile; the maximum voltage parameter in the BHM message is filled with the value obtained by the first PLC communication between the adapter and the EVCC of the European standard car; after the national standard charging pile receives the BHM message, it starts insulation detection; Step 43: When the insulation test of the national standard charging pile is completed and the insulation test result is normal, the national standard charging pile sends a CRM 0x00 message that cannot be recognized by BMS; if the insulation test of the national standard charging pile is abnormal, or the insulation test is not completed within the time limit, the adapter terminates the charging process; if the adapter has received the national standard charging pile CRM 0x00 message that cannot be recognized by BMS, it replies with a BRM message.

9. The control method of a national standard to European standard DC charging adapter according to claim 8, characterized in that: The step 5 comprises the following steps: Step 51, the adapter performs the second PLC communication with the European standard vehicle, the adapter outputs 100% duty cycle, connects the PP resistor to simulate the European standard plug-in signal, and wakes up the vehicle; Step 52, when the adapter detects that the CP state is B, it starts to output a 5% duty cycle; the adapter and the EVCC of the European standard vehicle interact through the European standard SLAC and SDP stages to establish a TCP connection; then the V2G message interaction is carried out, and the protocol handshake stage, session establishment stage, service discovery stage, service and payment method selection stage, authorization stage, and parameter discovery stage are sequentially passed; in the parameter discovery stage, the national standard CML and CTS messages will be waited for and synchronized; Step 53: After the adapter receives the CRM 0xAA BMS-recognizable message sent by the national standard charging pile, it starts to send the BCP message; the limit parameters and battery voltage parameters in the BCP message are filled in with the values ​​obtained by the first PLC communication between the adapter and the European standard vehicle; Step 54: After the adapter receives the CML and CTS messages sent by the national standard charging pile, it starts to send the BRO 0x00 BMS not ready for charging message, and fills the limit parameters of the national standard charging pile obtained in the CML message into the corresponding parameters of the ChargeParameterDiscoveryRes message and sends it to the EVCC of the European standard vehicle, completing the synchronization of the parameter discovery phase message of the EVCC of the European standard vehicle with the CML message of the national standard charging pile. If the adapter does not receive the CML and CTS messages sent by the national standard charging pile, it will continue to stay in the parameter discovery phase with the EVCC of the European standard vehicle for message interaction.

10. The control method of a national standard to European standard DC charging adapter according to claim 9, characterized in that: The step 6 comprises the following steps: Step 61, the adapter and the EVCC of the European standard vehicle complete the message exchange in the insulation detection phase, and the EVCC of the European standard vehicle starts to send the pre-charge request message PreChargeReq; after receiving the PreChargeReq message, the adapter starts the analog high-voltage output, and the output voltage is the target voltage in the pre-charge request message PreChargeReq; the adapter starts to monitor the voltage output to DC+ and DC-, and fills the voltage value filled in by the measured value into the corresponding parameter of PreChargeRes and sends it to the EVCC of the European standard vehicle; Step 62: When the EVCC of the European standard vehicle detects that the pre-charge voltage is qualified, the vehicle-side contactor is closed, the vehicle-side sends a PowerDeliveryReq message, and the adapter replies with a PowerDeliveryRes message, and the European standard charging phase CurrentDemand message interaction begins; at this time, for the national standard charging pile, it is equivalent to the vehicle closing the K5 and K6 contactors, and there is a high-voltage output on the gun line port. The adapter turns off the analog high-voltage output of the internal boost module, that is, the boost module output is 0 at this time, and sends a BRO 0xAA BMS message to the national standard charging pile to complete the charging preparation; Step 63: After receiving the BRO 0xAA BMS charging preparation completion message sent by the adapter, the national standard charging pile starts to send the CRO 0x00 charger charging preparation completion message; after detecting the battery voltage at the vehicle end, the national standard charging pile starts to raise the voltage and performs national standard pre-charging; at this time, the adapter interacts with the EVCC of the European standard vehicle in the charging phase CurrentDemand message, and the adapter replies to the CurrentDemandRes message of the EVCC of the European standard vehicle, with the current voltage PresentVoltage filled in as the battery voltage, and the current current PresentCurrent filled in as 0; Step 64: When the national standard charging pile has completed the boost and pre-charging, close the K1 and K2 contactors and send a CRO 0xAA message indicating that the charger has completed charging preparation; after receiving the CRO 0xAA message indicating that the charger has completed charging preparation, the adapter sends BCL and BCS messages; after receiving the BCL and BCS messages, the national standard charging pile starts to send CCS messages; after receiving the CCS message, the adapter periodically sends BCL, BCS, and BSM messages, and fills the current voltage and current values ​​in the CCS message into the current voltage and current current parameters in the CurrentDemandRes message; Step 65. When the European standard car is fully charged, the EVCC of the European standard car sends a PowerDeliveryReq message to terminate the charging session, and the adapter replies with a PowerDeliveryRes message to the European standard car. At the same time, the adapter sends a BST message to the national standard charging pile. The adapter and the EVCC of the European standard car end the European standard charging session after the WeldingDetection and SessionStop stages. The adapter receives the CST message sent by the national standard charging pile and sends a BSD message, waiting for the CSD message sent by the pile. The adapter receives the CSD message from the pile and the charging is completed.

Images