Vehicle, control guide circuit, charging control guide method

Abstract

The application discloses a vehicle, a control guide circuit, and a charging control guide method. The vehicle comprises a vehicle body ground wire, a vehicle end pull-up power supply, a vehicle end pull-up resistor, a broken wire detection switch, and a vehicle controller. The first end of the series connection of the vehicle end pull-up resistor and the broken wire detection switch is connected to the vehicle end pull-up power supply. The second end of the series connection of the vehicle end pull-up resistor and the broken wire detection switch is connected to the second connection confirmation terminal of the vehicle. When the vehicle is charged by a power supply device, the vehicle controller controls the broken wire detection switch to be in an open state, so that the power supply device can detect the broken wire between the vehicle body ground wire and the device ground wire. When the broken wire occurs between the vehicle body ground wire and the device ground wire, the power supply device can detect the broken wire fault.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a vehicle, a control and guidance circuit, and a charging control and guidance method. Background Technology

[0002] In related technologies, in order to supply power to a vehicle, the power supply equipment needs to connect its power supply connector to the vehicle's charging connector. At this time, the power supply connector's PE (protecting earth) will be connected to the charging connector's PE. Moreover, since the power supply connector's PE needs to be connected to the equipment's ground wire, and the charging connector's PE needs to be connected to the vehicle's ground wire, after the power supply connector's PE and the charging connector's PE are connected, the equipment ground wire, the power supply connector's PE, the charging connector's PE, and the vehicle's ground wire will combine into a very long ground wire, which is prone to breakage faults. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a vehicle in which the power supply equipment can detect a break in the wire between the vehicle body ground wire and the equipment ground wire.

[0004] The second objective of this invention is to provide a control and guidance circuit.

[0005] The third objective of this invention is to provide a charging control guidance method.

[0006] To achieve the above objectives, a first aspect of the present invention provides a vehicle, including a vehicle body ground wire, a vehicle-end pull-up power supply, a vehicle-end pull-up resistor, a disconnection detection switch, and a vehicle controller. The first end of the vehicle-end pull-up resistor and the disconnection detection switch connected in series is connected to the vehicle-end pull-up power supply, and the second end of the vehicle-end pull-up resistor and the disconnection detection switch connected in series is connected to the vehicle's second connection confirmation terminal. When the vehicle is being charged by a power supply device, the vehicle controller controls the disconnection detection switch to be in an open state so that the power supply device can detect a disconnection between the vehicle body ground wire and the device ground wire.

[0007] To achieve the above objectives, a second aspect of the present invention provides a control guidance circuit, including a vehicle-side control guidance module and a device-side control guidance module. The vehicle-side control guidance module includes a vehicle body ground wire, a vehicle-side pull-up power supply, a vehicle-side pull-up resistor, a disconnection detection switch, and a vehicle controller. The device-side control guidance module includes a device controller. The first terminal of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to the vehicle-side pull-up power supply, and the second terminal of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to a second connection confirmation terminal of the vehicle. When the vehicle is being charged by the power supply equipment, the vehicle controller controls the disconnection detection switch to be in an open state. When the power supply equipment is charging the vehicle, the device controller performs disconnection detection between the vehicle body ground wire and the device ground wire.

[0008] To achieve the above objectives, a third aspect of the present invention provides a charging control guidance method, applied in the aforementioned control guidance circuit. The method includes: when the vehicle is charging via a power supply device, the vehicle controller controls the disconnection detection switch to be in an open state; the device controller acquires the voltage of a first detection point in the device-side control guidance module; and performs disconnection detection between the vehicle body ground wire and the device ground wire based on the voltage of the first detection point.

[0009] The vehicle, control guidance circuit, and charging control guidance method of this invention embodiment, by setting a disconnection detection switch, and setting the first end of the vehicle-end pull-up resistor and the disconnection detection switch connected in series to the vehicle-end pull-up power supply, and setting the second end of the vehicle-end pull-up resistor and the disconnection detection switch connected in series to the vehicle's second connection confirmation terminal, thereby preventing the disconnection detection switch from affecting the disconnection detection of the power supply equipment when the vehicle is being charged through the power supply equipment. This enables the power supply equipment to detect the disconnection fault when a disconnection occurs between the vehicle body ground wire and the equipment ground wire.

[0010] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of the present invention;

[0012] Figure 2 This is a circuit diagram of a control guidance circuit according to an embodiment of the present invention;

[0013] Figure 3 This is a flowchart of a charging control guidance method according to an embodiment of the present invention. Detailed Implementation

[0014] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0015] The vehicle, control guidance circuit, and charging control guidance method of the present invention are described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of a vehicle according to an embodiment of the present invention.

[0017] like Figure 1 As shown, vehicle 100 includes a vehicle body ground wire, vehicle-side pull-up power supply U2, vehicle-side pull-up resistor R5, open circuit detection switch S5, and vehicle controller.

[0018] Specifically, the first end of the series connection between the vehicle-side pull-up resistor R5 and the disconnection detection switch S5 is connected to the vehicle-side pull-up power supply U2, and the second end of the series connection between the vehicle-side pull-up resistor R5 and the disconnection detection switch S5 is connected to the vehicle's second connection confirmation terminal CC2. When the vehicle 100 is being charged by the power supply equipment, the vehicle controller controls the disconnection detection switch S5 to be in the off state so that the power supply equipment can detect the disconnection between the vehicle body ground wire and the equipment ground wire.

[0019] It should be noted that the aforementioned vehicle-side pull-up resistor R5 is connected between the vehicle-side pull-up power supply U2 and the disconnection detection switch S5. The aforementioned disconnection detection switch S5 is a normally closed switch, but it is in an open state during the charging process of the vehicle 100 through the power supply equipment; for example, the vehicle controller can control the disconnection detection switch S5 to open when it detects the occurrence of charging current, and determine that charging has ended when it detects that the charging current has dropped to less than a preset current threshold, such as 5A, and control the disconnection detection switch S5 to close and enter a normally closed state.

[0020] Specifically, the second connection confirmation terminal CC2 is located in the charging connector of vehicle 100, which is connected to the power supply connector of the power supply equipment so that the power supply equipment can charge vehicle 100. During the charging process of vehicle 100 through the power supply equipment, the disconnection detection switch S5 is opened, causing the vehicle-side pull-up resistor R5 and the vehicle-side pull-up power supply U2 to disconnect from the power supply connector of the power supply equipment. This prevents the vehicle-side pull-up resistor R5 and the vehicle-side pull-up power supply U2 from interfering with the disconnection detection process between the vehicle body ground wire and the equipment ground wire.

[0021] Optionally, the aforementioned disconnection detection switch S5 can also be connected between the vehicle-side pull-up power supply U2 and the vehicle-side pull-up resistor R5.

[0022] Furthermore, the aforementioned vehicle 100 includes the vehicle body. See also Figure 1 The vehicle 100 also includes a vehicle-end grounding resistor R4, which is installed in the vehicle body. One end of the vehicle-end grounding resistor R4 is connected to the vehicle body ground wire, and the other end of the vehicle-end grounding resistor R4 is connected to the vehicle's first connection confirmation terminal CC1.

[0023] See Figure 1 The aforementioned power supply equipment includes a device-side pull-up resistor R1 and a device-side pull-up power supply U1, as well as a device controller. The device controller detects a break in the connection between the vehicle's ground wire and the device ground wire when the power supply equipment is charging the vehicle. The power supply connector of the aforementioned power supply equipment includes a device-side guiding resistor R2 and a charging switch S. The connection point between the device-side guiding resistor R2 and the charging switch S, connected in series, and the device ground wire is the first node A.

[0024] Specifically, the first connection confirmation terminal CC1 of the vehicle 100 is located in the vehicle charging connector. When the vehicle 100 is charged by the power supply equipment, the first connection confirmation terminal CC1 of the vehicle 100 is connected to the first connection confirmation terminal of the power supply equipment and serves as the first detection point, so that the power supply equipment can perform a disconnection detection between the vehicle body ground wire and the equipment ground wire based on the voltage of the first detection point. The first connection confirmation terminal of the power supply equipment is located in the power supply connector. The connection point between the vehicle-side grounding resistor R4 and the vehicle body ground wire is the second node B.

[0025] Specifically, the first detection point is connected to the device-side pull-up power supply U1 via a device-side pull-up resistor R1, and to the device ground wire via a series-connected device-side guiding resistor R2 and charging switch S. When the voltage at the first detection point jumps from a first voltage to a second voltage, it can be determined that there is a break in the connection between the first node A and the device ground wire, where the second voltage is greater than the first voltage. When the voltage at the first detection point jumps from the first voltage to a third voltage, it can be determined that there is a break in the connection between the first node A and the second node B, where the third voltage is greater than the first voltage. That is, during the charging process of vehicle 100 via the power supply equipment, if the voltage at the first detection point is detected to jump from the first voltage to the second voltage, it is determined that there is a break in the connection between the first node A and the device ground wire, such as a disconnection between the power supply connector PE and the device ground wire; if the voltage at the first detection point is detected to jump from the first voltage to the third voltage, it is determined that there is a break in the connection between the first node A and the second node B, such as a broken pin at the connection between the charging connector and the power supply connector, or a break in the connection between the charging connector PE and the vehicle ground wire. Therefore, the power supply equipment can detect the disconnection between the vehicle body ground wire and the equipment ground wire. Moreover, by setting the vehicle-side grounding resistor R4 inside the vehicle body, the power supply equipment can detect the connection between the charging connector PE and the vehicle body ground wire.

[0026] It should be noted that during the charging process of vehicle 100 via the power supply equipment, if the voltage at the first detection point is detected to jump from the first voltage to the third voltage, it can be determined that there is a break in the connection between the first node A and the second node B. In specific implementations, there are three possible scenarios for the break between the first node A and the second node B: the first scenario is a break in the connection between the first node A on the power supply equipment side and the connection point between the power supply connector of the power supply equipment and the charging connector of vehicle 100; the second scenario is a break in the connection between the first node A and the second node B due to a broken pin at the connection point between the charging connector and the power supply connector; the third scenario is a break in the connection between the second node B on the vehicle 100 side and the connection point between the charging connector of vehicle 100 and the power supply plug of the power supply equipment.

[0027] Optionally, the connection point between the vehicle controller and the pull-up resistor R5 on the vehicle side can be used as a second detection point. The connection status of the charging connector and the power supply connector can then be determined by combining the detection results of the first and second detection points. The specific detection methods for the connection status of the charging connector and the power supply connector are existing technologies and can be found in Table 1 below, which will not be elaborated further here.

[0028] Further, see Figure 1The power supply connector of the aforementioned power supply equipment also includes a device-side grounding resistor R3. The first end of the device-side grounding resistor R3 is connected to the device ground wire, and the second end of the device-side grounding resistor R3 is connected to the second connection confirmation terminal of the power supply equipment.

[0029] See Figure 1 The power supply equipment also includes an off-board charger power module, and the vehicle 100 also contains a power battery. The off-board charger power module can then DC charge the power battery, enabling the power supply equipment to charge the vehicle 100. There are also switches K1, K2, K5, and K6, which can be, for example, high-voltage switches.

[0030] The vehicle of this embodiment of the invention will be described in detail below with reference to a specific example.

[0031] In this specific example, the resistors R1, R2, R3, R4, and R5 are all 1000Ω, and the voltage provided by the pull-up power supply U1 at the device end is 12V. Therefore, the first voltage is 4V, the second voltage is 12V, and the third voltage is 6V.

[0032] Specifically, a disconnection detection switch S5 is installed inside the vehicle 100. This disconnection detection switch S5 is a normally closed switch. When the vehicle is charging through the power supply equipment, the disconnection detection switch S5 is opened, thereby eliminating the influence of the vehicle-side pull-up power supply U2 and the vehicle-side pull-up resistor R5 during the disconnection detection process of the power supply equipment. Furthermore, the vehicle-side grounding resistor R4 is moved inside the vehicle body to obtain a larger detection range, so that the power supply equipment can identify disconnections at different locations.

[0033] Simultaneously, the connection status between the charging connector and the power supply connector, whether a disconnection has occurred, and whether switch S is open can be determined by combining the voltage at the first detection point and the voltage at the second detection point. See Table 1 below for details:

[0034] Table 1

[0035]

[0036]

[0037] In summary, the vehicle of this embodiment of the invention, by setting a disconnection detection switch and controlling the disconnection detection switch to open during the charging process of the vehicle through the power supply equipment, prevents the pull-up power supply and pull-up resistor at the vehicle end from affecting the detection during the disconnection detection between the vehicle body ground wire and the equipment ground wire by the power supply equipment, so that the power supply equipment can detect when a disconnection occurs between the vehicle body ground wire and the equipment ground wire.

[0038] Furthermore, the present invention proposes a control guidance circuit.

[0039] Figure 2 This is a circuit diagram of the control and guidance circuit according to an embodiment of the present invention.

[0040] like Figure 2 As shown, the control guidance circuit 200 includes a vehicle-side control guidance module 201 and an equipment-side control guidance module 202. The vehicle-side control guidance module 201 includes a vehicle body ground wire, a vehicle-side pull-up power supply U2, a vehicle-side pull-up resistor R5, a disconnection detection switch S5, and a vehicle controller. The equipment-side control guidance module 202 includes an equipment controller. The first terminal of the series connection between the vehicle-side pull-up resistor R5 and the disconnection detection switch S5 is connected to the vehicle-side pull-up power supply U2, and the second terminal of the series connection between the vehicle-side pull-up resistor R5 and the disconnection detection switch S5 is connected to the second connection confirmation terminal CC2 of the vehicle 100. When the vehicle 100 is being charged by the power supply equipment, the vehicle controller controls the disconnection detection switch S5 to be in the open state. When the power supply equipment is charging the vehicle 100, the equipment controller performs disconnection detection between the vehicle body ground wire and the equipment ground wire.

[0041] Optionally, the vehicle-side pull-up resistor R5 is connected between the vehicle-side pull-up power supply U2 and the disconnection detection switch S5, or the disconnection detection switch S5 is connected between the vehicle-side pull-up power supply U2 and the vehicle-side pull-up resistor R5.

[0042] The open circuit detection switch S5 is a normally closed switch. The vehicle 100 includes a vehicle body, and the vehicle-side control and guidance module 201 also includes a vehicle-side grounding resistor R4. The vehicle-side grounding resistor R4 is installed in the vehicle body, and one end of the vehicle-side grounding resistor R4 is connected to the vehicle body ground wire, and the other end of the vehicle-side grounding resistor R4 is connected to the first connection confirmation terminal CC1 of the vehicle 100.

[0043] Furthermore, the device-side control guidance module 202 also includes a device-side pull-up power supply U1, a device-side pull-up resistor R1, a device-side guiding resistor R2, a charging switch R2, and a device-side grounding resistor R3. The first end of the device-side pull-up resistor R1 is connected to the device-side pull-up power supply U1, and the second end of the device-side pull-up resistor R1 is connected to the first connection confirmation terminal of the power supply device and serves as the first detection point of the power supply device. The first end of the device-side guiding resistor R2 and the charging switch R2 connected in series is connected to the device ground wire, and the second end of the device-side guiding resistor R2 and the charging switch R2 connected in series is connected to the first connection confirmation terminal of the power supply device. The first end of the device-side grounding resistor R3 is connected to the device ground wire, and the second end of the device-side grounding resistor R3 is connected to the second connection confirmation terminal of the power supply device. The first connection confirmation terminal of the power supply device is used to connect to the first connection confirmation terminal CC1 of the vehicle 100, and the second connection confirmation terminal of the power supply device is used to connect to the second connection confirmation terminal CC2 of the vehicle. The device controller is used to obtain the voltage of the first detection point and perform a disconnection detection between the vehicle body ground wire and the device ground wire based on the voltage of the first detection point.

[0044] The device controller is also used to determine, when the voltage at the first detection point changes from the first voltage to the second voltage, that there is a break in the connection between the first node and the device ground wire, wherein the first node is the connection point between the device-end guiding resistor R2 and the charging switch R2 connected in series and the device ground wire; and to determine, when the voltage at the first detection point changes from the first voltage to the third voltage, that there is a break in the connection between the first node and the second node, wherein the second node is the connection point between the vehicle-end grounding resistor R4 and the vehicle body ground wire.

[0045] It should be noted that for other specific embodiments of the control guidance circuit 200 of the present invention, please refer to the specific embodiments of the vehicle 100 described above.

[0046] The control guidance circuit of this invention sets up a disconnection detection switch and controls the disconnection detection switch to open during the charging process of the vehicle through the power supply equipment. This prevents the pull-up power supply and pull-up resistor at the vehicle end from affecting the detection during the disconnection detection process between the vehicle body ground wire and the equipment ground wire. This allows the power supply equipment to detect when a disconnection occurs between the vehicle body ground wire and the equipment ground wire.

[0047] Furthermore, the present invention proposes a charging control guidance method, which is applied to the above-mentioned control guidance circuit.

[0048] Figure 3 This is a flowchart of a charging control guidance method according to an embodiment of the present invention.

[0049] like Figure 3 As shown, the charging control guidance method includes the following steps:

[0050] S71, when the vehicle is being charged via a power supply device, the vehicle controller keeps the disconnection detection switch in the off state.

[0051] S72, the device controller acquires the voltage of the first detection point in the device-side control guidance module.

[0052] S73, based on the voltage at the first detection point, performs a disconnection detection between the vehicle ground wire and the equipment ground wire.

[0053] In one embodiment of the present invention, the above-mentioned detection of a disconnection between the vehicle ground wire and the equipment ground wire based on the voltage of the first detection point includes: determining a disconnection between the first node and the equipment ground wire when the voltage at the first detection point jumps from a first voltage to a second voltage, wherein the first node is the connection point of the equipment-end guiding resistor and the charging switch connected in series with the equipment ground wire; determining a disconnection between the first node and the second node when the voltage at the first detection point jumps from the first voltage to a third voltage, wherein the second node is the connection point of the vehicle-end grounding resistor and the vehicle ground wire.

[0054] It should be noted that other specific embodiments of the charging control guidance method of this invention can be found in the control guidance circuit described above.

[0055] The charging control guidance method of this invention sets up a disconnection detection switch and controls the disconnection detection switch to open during the charging process of the vehicle through the power supply equipment. This prevents the pull-up power supply and pull-up resistor at the vehicle end from affecting the detection during the disconnection detection between the vehicle body ground wire and the equipment ground wire by the power supply equipment. This enables the power supply equipment to detect when a disconnection occurs between the vehicle body ground wire and the equipment ground wire.

[0056] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0057] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0058] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A vehicle, characterized in that, The system includes a vehicle ground wire, a vehicle-side pull-up power supply, a vehicle-side pull-up resistor, a disconnection detection switch, and a vehicle controller. The first terminal of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to the vehicle-side pull-up power supply. The second terminal of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to the vehicle's second connection confirmation terminal. When the vehicle is being charged by the power supply equipment, the vehicle controller controls the disconnection detection switch to be in the off state so that the power supply equipment can detect the disconnection between the vehicle ground wire and the equipment ground wire. It also includes the vehicle body and the vehicle-end grounding resistor. The vehicle-end grounding resistor is disposed in the vehicle body. One end of the vehicle-end grounding resistor is connected to the vehicle body ground wire, and the other end of the vehicle-end grounding resistor is connected to the first connection confirmation terminal of the vehicle. When the vehicle is being charged by the power supply equipment, the first connection confirmation terminal of the vehicle is connected to the first connection confirmation terminal of the power supply equipment and serves as a first detection point, so that the power supply equipment can perform a disconnection detection between the vehicle body ground wire and the equipment ground wire based on the voltage of the first detection point. The first detection point is connected to the device-side pull-up power supply via a device-side pull-up resistor, and is connected to the device ground wire via a device-side guiding resistor and a charging switch connected in series. The device-side guiding resistor and the charging switch are located inside the power supply connector of the power supply equipment. When the voltage at the first detection point jumps from the first voltage to the second voltage, it is determined that there is a break in the connection between the first node and the device ground wire. The first node is the connection point between the series-connected device end guiding resistor and charging switch and the device ground wire. When the voltage at the first detection point jumps from the first voltage to the third voltage, it is determined that there is a break in the connection between the first node and the second node, wherein the second node is the connection point between the vehicle-end grounding resistor and the vehicle body ground wire; When the vehicle controller detects that the charging current has dropped below a preset current threshold, it determines that the charging has ended and controls the disconnection detection switch to close and enter a normally closed state.

2. The vehicle as described in claim 1, characterized in that, The vehicle-side pull-up resistor is connected between the vehicle-side pull-up power supply and the disconnection detection switch, or the disconnection detection switch is connected between the vehicle-side pull-up power supply and the vehicle-side pull-up resistor.

3. The vehicle as described in claim 1 or 2, characterized in that, The disconnection detection switch is a normally closed switch.

4. A control and guidance circuit, characterized in that, The system includes a vehicle-side control guidance module and an equipment-side control guidance module. The vehicle-side control guidance module includes a vehicle ground wire, a vehicle-side pull-up power supply, a vehicle-side pull-up resistor, a disconnection detection switch, and a vehicle controller. The equipment-side control guidance module includes an equipment controller. The first end of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to the vehicle-side pull-up power supply, and the second end of the series connection between the vehicle-side pull-up resistor and the disconnection detection switch is connected to the vehicle's second connection confirmation terminal. The vehicle controller controls the disconnection detection switch to be in the off state when the vehicle is being charged by the power supply equipment. The device controller performs a disconnection detection between the vehicle body ground wire and the device ground wire when the power supply equipment is charging the vehicle; The vehicle includes a vehicle body, and the vehicle-side control and guidance module also includes a vehicle-side grounding resistor. The vehicle-side grounding resistor is disposed in the vehicle body, and one end of the vehicle-side grounding resistor is connected to the vehicle body ground wire, and the other end of the vehicle-side grounding resistor is connected to the first connection confirmation terminal of the vehicle. The device-side control guidance module further includes a device-side pull-up power supply, a device-side pull-up resistor, a device-side guiding resistor, a charging switch, and a device-side grounding resistor. The device-side guiding resistor and the charging switch are disposed within the power supply connector of the power supply device. The first end of the device-side pull-up resistor is connected to the device-side pull-up power supply, and the second end of the device-side pull-up resistor is connected to the first connection confirmation terminal of the power supply device, serving as the first detection point of the power supply device. The first end of the device-side guiding resistor and the charging switch connected in series is connected to the device ground wire. The second end of the device-side guiding resistor and the charging switch connected in series is connected to the first connection confirmation terminal of the power supply device. The first end of the device-side grounding resistor is connected to the device ground wire, and the second end of the device-side grounding resistor is connected to the second connection confirmation terminal of the power supply device. The first connection confirmation terminal of the power supply device is used to connect to the first connection confirmation terminal of the vehicle, and the second connection confirmation terminal of the power supply device is used to connect to the second connection confirmation terminal of the vehicle. The device controller is used to acquire the voltage at the first detection point and perform a disconnection detection between the vehicle ground wire and the device ground wire based on the voltage at the first detection point. The device controller is also used for, When the voltage at the first detection point jumps from the first voltage to the second voltage, it is determined that there is a break in the connection between the first node and the device ground wire. The first node is the connection point between the series-connected device end guiding resistor and charging switch and the device ground wire. When the voltage at the first detection point jumps from the first voltage to the third voltage, it is determined that there is a break in the connection between the first node and the second node, wherein the second node is the connection point between the vehicle-end grounding resistor and the vehicle body ground wire; The disconnection detection switch is a normally closed switch; when the vehicle controller detects that the charging current has dropped to less than a preset current threshold, it determines that charging has ended and controls the disconnection detection switch to close and enter the normally closed state.

5. The control and guidance circuit as described in claim 4, characterized in that, The vehicle-side pull-up resistor is connected between the vehicle-side pull-up power supply and the disconnection detection switch, or the disconnection detection switch is connected between the vehicle-side pull-up power supply and the vehicle-side pull-up resistor.

6. The control guidance circuit as described in claim 4 or 5, characterized in that, The disconnection detection switch is a normally closed switch.

7. A charging control guidance method, characterized in that, Applied in the control guidance circuit as described in any one of claims 4-6, the method comprises: When the vehicle is being charged via a power supply device, the vehicle controller controls the disconnection detection switch to be in the off state. The device controller acquires the voltage of the first detection point in the device-side control guidance module; The disconnection between the vehicle ground wire and the equipment ground wire is detected based on the voltage at the first detection point.

8. The charging control guidance method as described in claim 7, characterized in that, Based on the voltage at the first detection point, a disconnection detection is performed between the vehicle ground wire and the equipment ground wire, including: When the voltage at the first detection point jumps from the first voltage to the second voltage, it is determined that there is a break in the connection between the first node and the device ground wire. The first node is the connection point between the series-connected device end guiding resistor and charging switch and the device ground wire. When the voltage at the first detection point jumps from the first voltage to the third voltage, it is determined that there is a break in the connection between the first node and the second node, wherein the second node is the connection point between the vehicle-end grounding resistor and the vehicle body ground wire.

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