A vehicle and its fast charging control system and method

Abstract

This invention provides a vehicle and its fast charging control system and method, belonging to the field of new energy vehicle charging technology. The control system includes a Battery Management System (BMS) and two Electric Vehicle Chargers (EVCCs). The BMS is communicatively connected to both EVCCs. The first EVCC is simultaneously communicatively connected to both the vehicle's first charging port and the pantograph busbar, and is used for communication with the SECC of the first charging pile via the first charging port and with the SECC of the pantograph via the pantograph busbar. The second EVCC is communicatively connected to the vehicle's second charging port and is used for communication with the SECC of the second charging pile via the second charging port. A mutual exclusion logic is configured in the BMS or either EVCC to prevent simultaneous pantograph charging and plug-in charging. This control system enables European standard pantograph charging with dual-gun charging while ensuring charging safety.

Description

Technical Field

[0001] This invention relates to a vehicle and its fast charging control system and method, belonging to the field of new energy vehicle charging technology. Background Technology

[0002] New energy electric commercial vehicles have increasingly higher requirements for fast charging and charging convenience. Currently, the main charging methods in the industry are single pantograph charging, European standard single-gun charging, European standard dual-gun charging, and European standard pantograph plus single-gun charging.

[0003] Chinese utility model patent document CN210554265U discloses a device for fast charging of new energy buses. This device has two charging modes: dual-gun charging in normal charging mode and dual-gun charging plus pantograph charging in fast charging mode. While the device can achieve dual-gun charging plus pantograph charging, the specific control process for this function is unclear, as is how the safety of the charging process is ensured. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle and its fast charging control system and method that can realize the European standard pantograph plus dual-gun charging technology and ensure charging safety.

[0005] To achieve the above objectives, the present invention provides a fast charging control system, which includes a Battery Management System (BMS) and two Electric Vehicle Chargers (EVCCs). The BMS is communicatively connected to the two EVCCs respectively. The first EVCC is simultaneously communicatively connected to both the first charging port and the pantograph busbar on the vehicle, and is used to communicate with the SECC of the first charging pile through the first charging port and with the SECC of the pantograph through the pantograph busbar. The second EVCC is communicatively connected to the second charging port on the vehicle and is used to communicate with the SECC of the second charging pile through the second charging port. A mutual exclusion logic is provided in the BMS or either EVCC to prevent pantograph charging and plug-in charging from occurring simultaneously.

[0006] The beneficial effects of this fast charging control system are: it enables pantograph-assisted dual-gun charging, meeting three different charging needs: single-gun charging, pantograph-assisted fast charging, and dual-gun-assisted fast charging. Furthermore, by implementing mutual exclusion logic, pantograph charging and plug-in charging cannot occur simultaneously, ensuring charging safety. This pantograph-assisted dual-gun charging technology is in particularly high demand in large-capacity public transportation systems in overseas cities, providing customers with significant charging convenience by enabling multiple fast charging methods on a single vehicle.

[0007] Furthermore, in the aforementioned fast charging control system, the BMS establishes CAN communication connections with both EVCCs.

[0008] Furthermore, in the aforementioned fast charging control system, the communication connections between the first EVCC and the first charging port, the first EVCC and the pantograph busbar, and the second EVCC and the second charging port are all achieved through a CP carrier line.

[0009] Furthermore, in the aforementioned fast charging control system, the CP carrier line of the first charging port is short-circuited with the CP carrier line of the pantograph bus and then connected to the first EVCC.

[0010] The present invention also provides a control method for the above-mentioned fast charging control system, the method comprising the following steps:

[0011] (1) After BMS charging is activated, it detects which signal is effective first, the plug-in signal or the pantograph rocker switch signal. If the plug-in signal is effective first, pantograph charging is disabled and the charging gun charging step is executed. If the pantograph rocker switch signal is effective first, plug-in charging is disabled and pantograph charging is executed according to pantograph mode.

[0012] (2) The charging gun charging steps include:

[0013] If a single charging port plug signal is valid, the BMS will respond to single-gun charging and execute the single-gun charging process.

[0014] If both charging port plug signals are valid, but only one EVCC communicates with the BMS, then the BMS responds to dual-gun charging in single EVCC mode and executes the dual-gun charging process; the response to dual-gun charging in single EVCC mode means that one EVCC controls two charging guns to charge at the same time, and the auxiliary gun communicates with the BMS through the main gun.

[0015] If both charging port plug signals are valid and both EVCCs communicate with the BMS respectively, the BMS will respond to dual-gun charging in dual EVCC mode and execute the dual-gun charging process. The dual-EVCC mode response to dual-gun charging means that one EVCC controls one charging gun, and the main gun and auxiliary gun communicate with the BMS independently.

[0016] The beneficial effects of this control method are: it can realize three charging modes: pantograph charging, single-gun charging, and dual-gun charging. Furthermore, by setting mutual exclusion logic, pantograph charging and gun charging cannot be carried out simultaneously, thus ensuring charging safety.

[0017] The present invention also provides a vehicle, including a vehicle body and a fast charging control system. The vehicle body is provided with two charging ports, and the vehicle top is provided with a pantograph busbar. The fast charging control system is the fast charging control system described above. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fast charging control system in a vehicle embodiment of the present invention;

[0019] Figure 2-1 This is a flowchart illustrating the determination of whether the pantograph rocker switch signal is valid in the vehicle embodiment of the present invention.

[0020] Figure 2-2 This is a flowchart illustrating the determination of whether the insertion gun signal is valid in a vehicle embodiment of the present invention.

[0021] Figure 3 This is a flowchart of the fast charging control method in the vehicle embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Vehicle Example:

[0024] The vehicle in this embodiment includes a vehicle body and a fast charging control system. The vehicle body is equipped with two charging gun ports (hereinafter referred to as charging ports), and the vehicle top is equipped with a pantograph busbar, which meets the EU charging standard.

[0025] The fast charging control system in this embodiment is as follows: Figure 1 As shown in the figure, BMS represents the Battery Management System, EVCC represents the Vehicle European Standard Charging Communication Controller, SECC represents the Pile European Standard Charging Communication Controller, and CP represents the European Standard Charging Control Guide.

[0026] Depend on Figure 1 As can be seen, the fast charging control system includes a BMS and two EVCCs. The BMS is connected to the two EVCCs respectively. The first EVCC (EVCC1) is connected to both the first charging port (charging port 1) and the pantograph busbar on the vehicle via a CP carrier line. The second EVCC (EVCC2) is connected to the second charging port (charging port 2) on the vehicle via a CP carrier line. EVCC1 is connected to the SECC (SECC1) of the first charging pile via charging port 1. At the same time, EVCC1 is also connected to the SECC (SECC3) of the pantograph via the pantograph busbar. EVCC2 is connected to the SECC (SECC2) of the second charging pile via charging port 2.

[0027] In this embodiment, the CP carrier line of charging port 1 is short-circuited with the CP carrier line of the pantograph bus and then connected to EVCC1. Alternatively, the CP carrier line of charging port 1 can be connected to EVCC1 independently, and the CP carrier line of the pantograph bus can also be connected to EVCC1 independently.

[0028] EVCC1, EVCC2 and BMS are in a charging CAN network. EVCC is responsible for forwarding CAN messages into PLC messages to meet the requirements of the European standard charging standard. BMS can communicate with two EVCCs at the same time to realize the dual-gun charging function.

[0029] EVCC1 and EVCC2 are configured with different network addresses, allowing the BMS to identify and distinguish between the two EVCCs. The advantages of this are: in dual-gun charging mode, if only one charging port communicates with the BMS (only the main charging pile communicates), the BMS can communicate with either EVCC; if both charging ports communicate with the BMS (two independent charging piles), the BMS can distinguish the different charging pile communication messages through the EVCC addresses, and thus respond to the charging requests of both charging piles, greatly improving the compatibility between the BMS and the charging pile status.

[0030] The fast charging control method based on the above fast charging control system is as follows: Figure 2-1 , Figure 2-2 and Figure 3 As shown, the BMS system is pre-set to have four states: charging gun not charging, charging gun charging, pantograph connected but not charging, and pantograph connected and charging. The definitions of the four states of the BMS system are as follows: ① Charging gun not charging: The charging gun is inserted, but there is no charging current; ② Charging gun charging: The charging gun is inserted and there is charging current; ③ Pantograph connected but not charging: The pantograph rocker switch signal is valid, but the solenoid valve signal is invalid; ④ Pantograph connected and charging: The pantograph rocker switch signal is valid, and the solenoid valve signal is valid (a valid solenoid valve signal indicates that the pantograph is lowered to the correct position).

[0031] Combination Figure 2-1 and Figure 2-2To ensure charging safety, this embodiment pre-sets a mutual exclusion logic in EVCC1 (in practical applications, the mutual exclusion logic can be set in BMS or any EVCC, and these three communicate with each other). This mutual exclusion logic prevents pantograph charging and plug-in charging from occurring simultaneously, ensuring that only one charging method can be performed at any given time. Specifically, when the pantograph rocker switch is pressed, if the vehicle-side VCU detects that the BMS system status is plug-in not charging or plug-in charging, it will not respond to the pantograph lowering request, and the pantograph rocker switch signal will be invalid. After the charging gun is inserted, if the BMS detects the pantograph rocker switch signal or the solenoid valve signal, the BMS will not respond to plug-in charging, and the plug-in signal will be invalid.

[0032] like Figure 3 As shown, the fast charging control method includes the following steps:

[0033] (1) After BMS charging is activated, the mutual exclusion logic is used to detect which signal is effective first, the plug-in signal or the pantograph rocker switch signal. If the plug-in signal is effective first, pantograph charging is disabled and the charging gun charging step is executed. If the pantograph rocker switch signal is effective first, plug-in charging is disabled and pantograph charging is executed according to pantograph mode. (2) The charging gun charging step includes:

[0034] If a single charging port plug signal is valid, the BMS will respond to single-gun charging and execute the single-gun charging process.

[0035] If both charging port plug signals are valid, but only one EVCC communicates with the BMS, the BMS will respond to dual-gun charging in single EVCC mode and execute the dual-gun charging process. At this time, one EVCC controls the charging of two charging guns at the same time. There is communication between the main gun and the auxiliary gun, and the auxiliary gun communicates with the BMS through the main gun.

[0036] If both charging port plug signals are valid and both EVCCs communicate with the BMS, the BMS will respond to dual-gun charging in dual-EVCC mode and execute the dual-gun charging process. In this case, one EVCC controls one charging gun, and the main gun and auxiliary gun communicate with the BMS independently.

[0037] In practical applications, the charging gun head has a 1.2K PP resistor. After the charging gun is inserted into the charging port, the BMS insertion detection signal will be pulled down from 5V to 2.5V. At this time, the BMS considers the insertion signal to be valid. Therefore, the voltage value of the BMS insertion detection signal can be used to determine whether the insertion signal of a single charging port is valid or both charging ports are valid.

[0038] In summary, the fast charging control system and method of this embodiment have the following advantages:

[0039] (1) It can realize the European standard pantograph plus dual gun charging function, and has three different charging methods: pantograph charging, single gun charging and dual gun charging.

[0040] (2) EVCC1 can connect the charging port 1 carrier line and the pantograph bus carrier line simultaneously through a CP carrier line, so that the pantograph and one of the charging guns can share a communication controller EVCC. This not only greatly reduces costs, but also adapts to the actual situation of having few BMS interfaces and reduces the load on the BMS.

[0041] (3) EVCC1, EVCC2 and BMS are in a charging CAN network. BMS can communicate with EVCC1 and ECC2 at the same time to realize dual-gun charging communication function.

[0042] (4) By setting mutual exclusion logic, the pantograph and the charging gun cannot be charged at the same time, ensuring that only one charging method can be carried out at the same time, thus fully guaranteeing charging safety.

[0043] (5) By defining the BMS system status, the vehicle controller and BMS can distinguish between charging mode and charging mode, making it easier to set mutual exclusion logic and design display status.

[0044] (6) By defining the BMS system status, the pantograph can be distinguished between being connected and not charging, and being connected and charging. The vehicle controller and BMS can distinguish the charging mode, which makes it easy to set mutual exclusion logic and design the display status.

[0045] System Implementation Example:

[0046] The fast charging control system in this embodiment is the same as the fast charging control system in the vehicle embodiment, and will not be described again here.

[0047] Method Implementation Examples:

[0048] The fast charging control method in this embodiment is the same as the fast charging control method in the vehicle embodiment, and will not be described again here.

Claims

1. A fast charging control system, characterized by, The control system comprises a BMS and two EVCCs, the BMS is in communication connection with the two EVCCs respectively, wherein the first EVCC is in communication connection with the first charging port and the pantograph busbar on the vehicle simultaneously, and is used for communication connection with the SECC of the first charging pile through the first charging port and for communication connection with the SECC of the pantograph through the pantograph busbar; the second EVCC is in communication connection with the second charging port on the vehicle, and is used for communication connection with the SECC of the second charging pile through the second charging port; a mutual exclusion logic is arranged in the BMS or any one of the EVCCs, so that the pantograph charging and the plug-in charging cannot be carried out simultaneously; after the BMS charging is activated, it is detected which one of the plug-in signal and the pantograph toggle switch signal is effective first, if the plug-in signal is effective first, the pantograph charging is shielded, the pantograph lowering request is not responded, and the charging gun charging step is executed, if the pantograph toggle switch signal is effective first, the plug-in charging is shielded, the plug-in charging is not responded, and the pantograph charging is executed according to the pantograph mode.

2. The fast charging control system of claim 1, wherein, The BMS is in CAN communication connection with the two EVCCs respectively.

3. The fast charging control system of claim 1 or 2, wherein, The communication connection between the first EVCC and the first charging port, the communication connection between the first EVCC and the pantograph busbar, and the communication connection between the second EVCC and the second charging port are all realized through CP carrier lines.

4. The fast charging control system of claim 3, wherein, The CP carrier line of the first charging port is connected to the first EVCC after being short-circuited with the CP carrier line of the pantograph busbar.

5. A control method for the rapid charging control system according to any one of claims 1 to 4, characterized by, The method comprises the following steps: (1) after the BMS charging is activated, it is detected which one of the plug-in signal and the pantograph toggle switch signal is effective first, if the plug-in signal is effective first, the pantograph charging is shielded, the pantograph lowering request is not responded, and the charging gun charging step is executed, if the pantograph toggle switch signal is effective first, the plug-in charging is shielded, the plug-in charging is not responded, and the pantograph charging is executed according to the pantograph mode; (2) the charging gun charging step comprises: if the single charging port plug-in signal is effective, the BMS responds to the single gun charging and executes the single gun charging process; if the plug-in signals of the two charging ports are both effective, but only one EVCC is in communication connection with the BMS, the BMS responds to the double gun charging according to the single EVCC mode and executes the double gun charging process; the responding to the double gun charging according to the single EVCC mode is that one EVCC controls the charging of two charging guns, and the auxiliary gun communicates with the BMS through the main gun; if the plug-in signals of the two charging ports are both effective, and the two EVCCs are in communication connection with the BMS respectively, the BMS responds to the double gun charging according to the double EVCC mode and executes the double gun charging process; the responding to the double gun charging according to the double EVCC mode is that one EVCC controls one charging gun, and the main gun and the auxiliary gun independently communicate with the BMS.

6. A vehicle comprising a vehicle body and a quick charging control system, the vehicle body being provided with two charging ports, and the vehicle top having a pantograph busbar, characterized in that, The fast charging control system is the fast charging control system according to any one of claims 1-4.

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