A direct current V2V control guide circuit design method

Abstract

The application discloses a DC V2V control guide circuit design method, relates to the technical field of new energy automobile charging control, and comprises the following steps: constructing a discharge vehicle side loop of a DC V2V control guide circuit, the discharge vehicle serving as an energy output end, comprising a vehicle control device, a low-voltage auxiliary power supply, a relay K3, a relay K4, a power supply, a resistor R4, a resistor R5, a vehicle body ground and a DC charging seat; the vehicle control device collects voltage changes of detection points; and the resistor R4 and the resistor R5 form a working condition identification loop. The DC V2V connection state and locking state identification are realized through voltage changes of detection points, a guide signal is provided by using the low-voltage auxiliary power supply of the vehicle, safety control is completed in combination with a mechanical lock and a resistance detection loop, the structural complexity is reduced, and the reliability and safety in the process of electric energy transmission between vehicles are improved.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle charging control technology, specifically to a DC V2V control and guidance circuit design method. Background Technology

[0002] In recent years, with the continuous advancement of energy structure adjustment, environmental protection, and the transformation and development of the automotive industry, the new energy vehicle industry has developed rapidly, and the number of new energy vehicles on the road has been increasing. Because new energy vehicles use power batteries as their energy source, their refueling methods differ from traditional fuel vehicles. As a result, there has been a growing number of situations where vehicles cannot continue driving due to insufficient battery power. Traditional towing methods for rescue suffer from long response times, high costs, and limited application scenarios, making it difficult to meet the needs of new energy vehicle users for rapid emergency refueling. DC V2V (Vehicle to Vehicle) charging technology, as a mobile refueling method that does not rely on fixed charging infrastructure, allows one new energy vehicle to directly transfer power to another, making it highly valuable in applications such as road emergency rescue, vehicle travel in remote areas, and fleet collaborative operations. Currently, DC V2V charging technology mainly includes external DC V2V charger solutions and on-board power circuit reuse solutions. The external DC V2V charger solution uses a dual-head DC charging gun to connect the discharging vehicle and the charging vehicle respectively, and the external charging equipment completes voltage conversion, current regulation, and charging process control. The on-board power circuit reuse solution uses the vehicle's own electric drive inverter and motor windings to form a DC conversion circuit, eliminating the need for an additional independent bidirectional DC-DC converter and external charging equipment, thus enabling direct energy exchange between vehicles.

[0003] However, existing external DC V2V charging solutions still have certain shortcomings. Because this solution relies on a separate external DC V2V charger, it adds voltage conversion equipment, current regulation equipment, and safety protection circuits to the system, resulting in a larger and heavier overall device that is inconvenient to carry in vehicles. Furthermore, the high procurement cost makes it difficult for ordinary users to adopt. In addition, the additional power management and protection structures increase system complexity and the risk of failure. While existing on-board power loop reuse solutions can reduce device size and cost, current technologies focus more on the design of vehicle power transmission paths and lack effective solutions for control guidance, connection status identification, mechanical lock-up confirmation, and safe discharge authorization during the DC V2V connection establishment process between vehicles. This means that the reliability and safety control capabilities of the connection during energy exchange between vehicles still have room for improvement. Therefore, there is an urgent need for a control guidance circuit design scheme suitable for DC V2V scenarios in new energy vehicles, which can reduce system complexity while achieving reliable connection identification, lock-up status detection, and safe discharge control between discharging and charging vehicles.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a DC V2V control and guidance circuit design method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a DC V2V control and guidance circuit design method, comprising the following steps: Construct a DC V2V control and guidance circuit for the discharge vehicle side, with the discharge vehicle serving as the energy output terminal. This includes a vehicle control unit, a low-voltage auxiliary power supply, relays K3 and K4, and a power supply. Resistor R4, resistor R5, vehicle ground and DC charging socket, vehicle control device collects and detects voltage changes at detection points, resistor R4 and resistor R5 form a working condition identification circuit; A discharge gun is set up to connect to the discharge vehicle. The discharge gun includes a mechanical lock S1 and a custom resistor R2. The mechanical lock S1 is connected to the DC charging socket and locks it. The resistor R2 is connected to the mechanical lock S1 and the vehicle body to form a detection branch. Voltage sampling and charging / discharging status identification are achieved by changing the resistance value of the resistor R2.

[0007] A charging gun is set up to connect to the charging vehicle. The charging gun includes a mechanical lock S2, a resistor R1 and a resistor R3. The mechanical lock S2 is connected to the DC charging socket of the charging vehicle and locks it. The resistor R3 forms a detection load for collecting the voltage at the detection point on the side of the charging vehicle. The charging vehicle-side circuit is configured with a DC V2V control and guidance circuit, with the charging vehicle acting as the energy receiver. It includes a vehicle control unit, power supply U2, and a resistor. ,resistance The vehicle control device determines the connection and lock-up status based on the voltage changes at the detection points on the discharging vehicle side and the charging vehicle side, and controls relays K3 and K4 to output low-voltage guidance signals.

[0008] The low-voltage auxiliary power supply in the discharge vehicle side circuit is used to provide 12V low-voltage power. After the discharge vehicle is connected and locked to the charging and discharging connection device, the vehicle control device controls relays K3 and K4 to close, so that the low-voltage auxiliary power supply outputs a 12V low-voltage signal to the detection circuit and transmits a low-voltage guidance signal to the charging vehicle side.

[0009] Power supply in the vehicle-side circuit of the discharge vehicle The resistor R5 is used to provide the working voltage of the detection circuit. The resistor R4 acts as a pull-up resistor to stabilize the voltage at the detection point. The resistor R4 and resistor R5 work together to form the working condition identification circuit. The charging and discharging connection status is determined by the change in the voltage at the detection point.

[0010] The custom resistor R2 in the discharge gun is configured with a resistance value according to the capacity of the charging and discharging connection cable. The resistor R2 is connected to the mechanical lock S1 and the vehicle body ground to form a load circuit. The voltage drop generated by the resistor R2 realizes the identification of the working conditions corresponding to different cable capacities.

[0011] Mechanical lock S1 is used to detect the connection status between the discharge gun and the DC charging socket of the discharge vehicle. When mechanical lock S1 is locked, the detection circuit on the discharge vehicle side generates a corresponding voltage change, and the vehicle control device determines the locking status of the discharge gun based on the voltage at the detection point.

[0012] The mechanical lock S2 in the charging gun is used to reliably lock the charging gun and the DC charging socket of the charging vehicle. The resistor R3 serves as a detection load on the charging vehicle side, and identifies the connection status of the charging gun by detecting the voltage change at the detection point.

[0013] The power supply U2 in the charging vehicle side circuit is used to provide a 12V low-voltage power supply, and the resistor... As the pull-up resistor stabilizes the detection voltage, the resistor... With resistance Together they form a working condition identification loop, used to determine the connection status on the charging vehicle side.

[0014] The vehicle control device collects data from the vehicle-side detection points during discharge. The voltage and voltage changes at detection point 2 on the charging vehicle side determine the connection status of the charging / discharging connection device. When the detection point... When the voltage at detection point 2 changes from 12V to 6V, it confirms that both the discharge gun and the charging gun are successfully connected.

[0015] The vehicle control device collects data from the vehicle-side detection points during discharge. The voltage and voltage change at detection point 1 on the charging vehicle side determine the mechanical locking status. Once mechanical locks S1 and S2 have locked, the detection point... The voltage at detection point 1 changed from 0V to 4V.

[0016] After confirming that the charging and discharging connection device is reliably connected and mechanically locked, the vehicle control device controls relays K3 and K4 to close, so that the discharging vehicle outputs a low-voltage guiding signal, which satisfies the V2V discharging conditions of the discharging vehicle and the energy receiving and transmission conditions of the charging vehicle.

[0017] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention utilizes a DC V2V control and guidance circuit design to achieve accurate identification of the vehicle connection status through the coordinated detection circuits between the discharging vehicle, the charging / discharging connection device, and the charging vehicle. The vehicle control device determines whether the charging / discharging connection device has completed the connection based on the voltage change at the detection point, avoiding power transmission when the connection status is not confirmed and improving the connection reliability during DC V2V power replenishment.

[0018] This invention utilizes a combination of mechanical locks and a detection circuit to detect the locking status of the charging / discharging connection device. After mechanical locks S1 and S2 lock, the voltage at the detection point changes accordingly. The vehicle control device determines the stability of the mechanical connection based on the voltage status, thereby improving the safety of energy transfer between vehicles and reducing abnormal situations caused by loose connections.

[0019] This invention provides guidance signals by reusing the vehicle's low-voltage auxiliary power supply, eliminating the need for an independent external control power supply structure and simplifying the DC V2V control guidance circuit. A resistance detection circuit is used to identify operating conditions, and based on the detection results, relays K3 and K4 are controlled to output low-voltage signals, enabling the discharging vehicle to safely discharge while ensuring the charging vehicle can reliably receive power. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a diagram of the DC V2V guidance control circuit of the present invention.

[0022] Figure 2This is a schematic diagram of the DC V2V connection corresponding to the present invention.

[0023] Attached reference numerals: a - Discharge vehicle, b - DC charging socket for discharge vehicle, c - Discharge plug d - cable, e - charging plug, f - DC charging socket for charging vehicle, g - charging vehicle.

[0024] Figure 3 This is a timing diagram for the present invention. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] This invention provides, for example Figures 1-3 The following are the specific steps of a DC V2V control and guidance circuit design method: The discharge vehicle, acting as the energy output terminal in the DC V2V energy transmission process, provides electrical energy to the vehicle being charged. Its internal components include a vehicle control unit, a low-voltage auxiliary power supply, relay K3, relay K4, and a power supply. The components include resistors R4 and R5, the vehicle ground, and the DC charging dock. These components work together to form a low-voltage control guide circuit. By detecting the connection status, lock-up status, and output control status, reliable interaction between the discharging vehicle and the charging vehicle is achieved, providing a control basis for the subsequent DC V2V discharge process.

[0027] The vehicle control unit in the discharging vehicle serves as the core control unit on the vehicle side. It is responsible for collecting and analyzing voltage changes at detection points, determining whether the charging / discharging connection is reliably connected, and verifying whether the connection has completed its locking operation. During the DC V2V connection process, the vehicle control unit acquires the corresponding voltage signal at the detection point in real time. When the voltage at the detection point meets preset state change conditions, it determines whether the connection between the discharging and charging vehicles is established and whether the current connection meets the external V2V discharge conditions. By using voltage changes at detection points to determine the status, the discharging process is prevented from starting if the charging / discharging connection is incomplete or the locking is abnormal, thus improving the safety and reliability of the vehicle's external power output.

[0028] A low-voltage auxiliary power supply is located inside the discharge vehicle to provide 12V low-voltage power during the DC V2V control and guidance process. As the power source for the detection circuit, after the charging / discharging connection device is connected and the locking is confirmed to be reliable, the user clicks the V2V external discharge switch on the vehicle display interface to trigger the discharge vehicle to enter the external power supply state. At this time, the low-voltage auxiliary power supply provides control power to relays K3 and K4, causing them to close and output 12V low-voltage electricity to the detection circuit, providing a stable power supply to the detection point. Simultaneously, a low-voltage guidance signal is output to the charging vehicle side, enabling status interaction between the discharge and charging vehicles.

[0029] Relays K3 and K4, serving as low-voltage output control elements on the vehicle side of the discharge circuit, remain open until the DC V2V connection is complete or the locking state is confirmed, preventing premature output of the low-voltage guidance signal. When the vehicle control unit determines that the charging / discharging connection is reliable and the mechanical locking state meets requirements, and simultaneously receives a user's V2V discharge initiation command, it controls relays K3 and K4 to close, allowing the 12V low-voltage power output from the low-voltage auxiliary power supply to enter the control guidance circuit. By controlling the on / off state of relays K3 and K4, the output state of the guidance signal on the vehicle side of the discharge circuit is switched, providing the corresponding electrical status for the vehicle control unit to determine the discharge conditions.

[0030] power supply This power supply provides a 12V low-voltage power source to the control guidance circuit on the vehicle side during discharge. Its output voltage value can be customized by the vehicle manufacturer according to the actual design requirements of the vehicle. During DC V2V control, the power supply... This provides the basic voltage conditions for the formation of the detection point voltage, enabling the vehicle control device to collect the voltage changes at the detection point under different connection states. A stable low-voltage power supply ensures reliable operation of the detection circuit under different operating conditions, while simultaneously meeting the vehicle control device's detection requirements for connection identification, lockout judgment, and discharge status confirmation.

[0031] Resistor R5, acting as a pull-up resistor in the vehicle-side control guide circuit, primarily stabilizes the voltage state at the detection point, keeping it within a identifiable voltage range. Resistors R4 and R5 jointly participate in the operational condition identification process, altering the detection point voltage state through their electrical relationship. When the connection status of the charging / discharging connection changes, the resistance relationship in the detection circuit changes synchronously, causing a change in the detection point voltage. The vehicle control device uses this voltage change to determine the current DC V2V connection status. Resistors R4 and R5 work together with the power supply... A stable and reliable detection structure is formed, enabling the discharge vehicle to accurately identify different working states.

[0032] The vehicle body ground serves as a common reference terminal in the electrical circuit on the discharge vehicle side, forming a complete low-voltage detection circuit and providing a reference for voltage changes at the detection point. The vehicle body ground connects to relevant electrical components in the control guide circuit, creating a complete loop between the low-voltage auxiliary power supply, resistors R4 and R5, and the DC charging socket. During DC V2V connections, the vehicle body ground not only participates in the transmission of detection signals but also provides a safe electrical foundation for the control guide circuit, ensuring stable transmission of detection signals.

[0033] The DC charging socket serves as the connection interface between the discharge vehicle and the charging / discharging connection device, enabling the electrical connection between the internal control and guidance circuit of the discharge vehicle and the external charging / discharging connection device. In conjunction with the discharge gun, the DC charging socket establishes a power transmission channel and a low-voltage detection channel based on a reliable mechanical connection. This allows the discharge vehicle to output control and guidance signals to the charging / discharging connection device and obtain external connection status information through voltage changes at detection points.

[0034] During DC V2V operation, the discharging vehicle is initially in a ready-to-connect state. At this time, the low-voltage auxiliary power supply does not drive relays K3 and K4 to close, and the vehicle control device continuously monitors the voltage status at the detection points. When the discharge gun is connected to the DC charging socket, the resistance relationship in the detection circuit changes, and the voltage at the detection point changes accordingly. The vehicle control device determines whether the charging and discharging connection device has completed the initial connection based on the voltage change. Subsequently, after the mechanical lock completes the locking operation, the connection status is further stabilized, and the vehicle control device continues to monitor the voltage change at the corresponding detection point to confirm the reliability of the mechanical connection.

[0035] After confirming the charging / discharging connection is secure and locked, the user initiates the V2V external discharge function via the vehicle's display interface. The low-voltage auxiliary power supply outputs control voltage, relays K3 and K4 close, and the discharge vehicle's side guide circuit outputs a 12V low-voltage signal. This low-voltage signal is transmitted to the charging vehicle side via a detection circuit, enabling the charging vehicle to identify the current DC V2V connection status. Simultaneously, the discharge vehicle control device continues to monitor the detection point status, determining whether the discharge process meets safety conditions based on whether the detection point voltage reaches the corresponding level.

[0036] Through the vehicle control unit, low-voltage auxiliary power supply, relay K3, relay K4, and power supply. The coordinated relationship between resistors R4 and R5, the vehicle body ground, and the DC charging dock forms a complete DC V2V control and guidance loop for the discharging vehicle. This loop utilizes low-voltage power supply and resistance detection to achieve connection identification, lockout judgment, and discharge authorization control, enabling reliable control of the DC V2V power replenishment process from the discharging vehicle to the charging vehicle without the need for additional external guidance equipment.

[0037] The discharge gun, as a connection device in the DC V2V control and guidance circuit, establishes the electrical connection between the discharge vehicle and the external charging / discharging connection circuit. The discharge gun consists of a mechanical lock S1 and a custom resistor R2. The mechanical lock S1 ensures a reliable connection and locking between the discharge gun and the DC charging socket of the discharge vehicle. The custom resistor R2 forms the load element in the detection circuit, participating in the voltage change process at the detection point through changes in its resistance parameter, thereby enabling the identification of the charging / discharging connection status and the judgment of the operating condition.

[0038] Mechanical lock S1 is installed in the discharge gun connection structure to ensure a stable connection between the discharge gun and the DC charging socket. During DC V2V charging, after the discharge gun is inserted into the DC charging socket of the discharge vehicle, mechanical lock S1 secures the mechanical connection between the two, preventing the discharge gun from becoming loose or shifting during power transmission. Mechanical lock S1 not only provides mechanical fixation but also participates in the status judgment during DC V2V control guidance. Once mechanical lock S1 is engaged, a stable connection is established between the discharge gun and the discharge vehicle, providing a stable electrical connection for the detection circuit. The vehicle control device can then determine whether the discharge gun is reliably connected and whether the locking is complete based on voltage changes at the detection point.

[0039] A custom resistor R2 connects the mechanical lock S1 to the vehicle ground, serving as a load element in the internal detection circuit of the discharge gun. Resistor R2, together with the resistor in the vehicle-side guide circuit, forms a voltage divider, causing a corresponding voltage change at the detection point. The vehicle control unit identifies the connection status between the discharge gun and the vehicle by collecting the voltage status at the detection point. When the discharge gun is not connected, the detection circuit is in its initial state, and the detection point maintains its initial voltage. When the discharge gun is connected to the DC charging dock of the vehicle, the mechanical lock S1 and resistor R2 are connected to the detection circuit, changing the original resistance relationship and causing a change in the voltage at the detection point. The vehicle control unit determines the connection status of the discharge gun based on this change.

[0040] The custom resistor R2 has an adjustable resistance value, which can be matched to different charging and discharging cable capacities. By adjusting the resistance value of R2, the discharge gun can be adapted to charging and discharging connection devices of different specifications, realizing different detection states corresponding to different cable capacities. The resistor matching relationship set in the disclosure materials includes: when the resistor R2 is 1000Ω, it corresponds to a current capacity of 250A; when the resistor R2 is 500Ω, it corresponds to a current capacity of 125A. In this way, the resistor R2 not only performs the function of voltage division sampling, but also serves as a cable capacity identification parameter, enabling the vehicle control device to determine the working capacity of the current connection device based on the detected voltage state.

[0041] During the DC V2V connection process, the discharge gun first establishes a connection with the DC charging dock of the vehicle via a mechanical structure. When the discharge gun is inserted into the DC charging dock, the mechanical lock S1 enters the connection state, and resistor R2 is simultaneously connected to the detection circuit. Because resistor R2 forms a load relationship with the vehicle ground, the voltage distribution in the detection circuit changes, and the voltage at the detection point changes from its initial state to the corresponding connection state. After the vehicle control device receives this voltage change at the detection point, it determines whether the discharge gun has completed the connection.

[0042] Once the mechanical lock S1 has reliably locked, a stable mechanical connection is established between the discharge gun and the DC charging socket, preventing abnormal detection signals due to unstable connections. At this time, the mechanical lock S1 remains locked, and the resistor R2 continues to participate in the detection circuit. The vehicle control device confirms that the discharge gun is in a reliable connection state based on the voltage change at the detection point, and provides a basis for determining the connection conditions for the subsequent DC V2V discharge process.

[0043] Resistor R2 and mechanical lock S1 work together to ensure physical connection reliability, while resistor R2 detects the electrical status. Together, they form the discharge gun-side connection identification structure, enabling the discharge vehicle to simultaneously acquire both the mechanical connection status and the electrical detection status. In practical applications, if the discharge gun is not fully inserted or mechanical lock S1 is not fully engaged, the detection circuit cannot establish the corresponding resistance relationship, the detection point cannot generate the target voltage state, and the vehicle control device determines based on the detection results that the current state does not meet the discharge conditions.

[0044] The custom resistor R2 in the discharge gun is configurable and can be adjusted according to vehicle application requirements, cable capacity, and DC V2V operating parameters. Different resistance values ​​correspond to different cable capacities, allowing the same type of control guide circuit to be used with charging and discharging connection devices of different specifications. Simultaneously, the voltage change at the detection point caused by the change in the resistance value of R2 can be detected by the vehicle control device, thereby determining the connection status and operating status.

[0045] The discharge gun, through the cooperation of mechanical lock S1, custom resistor R2, and vehicle ground, forms a control and guidance structure with functions of connection confirmation, lock detection, and operating condition identification. Specifically, mechanical lock S1 ensures the mechanical reliability between the discharge gun and the DC charging socket, custom resistor R2 provides a reference terminal for detecting changes in electrical parameters in the detection circuit, and vehicle ground provides a reference terminal for the detection circuit. Together, these three components constitute the discharge gun-side control and guidance unit, providing the foundation for establishing a safe and reliable energy interaction connection between DC V2V vehicles.

[0046] During DC V2V discharge, the discharge gun not only serves as a power transmission connection component but also transmits control and guidance signals. A mechanical lock S1 ensures a stable connection between the discharge gun and the vehicle, while a custom resistor R2 detects the connection status and identifies the operating conditions. This allows the vehicle control device to accurately determine the current discharge gun connection status and decide whether subsequent discharge control conditions are met based on the detection results. This structure utilizes the existing internal structure of the discharge gun to achieve connection identification, eliminating the need for additional detection equipment and improving the integration level of the DC V2V connection device.

[0047] The charging gun, as a connection device in the DC V2V control and guidance circuit connecting the charging vehicle, is used to establish the connection between the charging vehicle and the external charging / discharging connection circuit, realizing connection confirmation and status detection during the process of the discharging vehicle transferring electrical energy to the charging vehicle. The charging gun consists of a mechanical lock S2 and a resistor R1. The mechanical lock S2 is used to reliably lock the charging gun and the DC charging socket of the charging vehicle, ensuring a stable mechanical connection between the charging gun and the charging vehicle. The resistor R3, as a load element in the detection circuit, is used to form a voltage divider sampling relationship and participates in the charging vehicle-side operating condition identification process.

[0048] Mechanical lock S2 is installed in the charging gun connection structure to improve the reliability of the connection between the charging gun and the DC charging socket of the charging vehicle. During DC V2V charging, after the charging gun is inserted into the DC charging socket of the charging vehicle, mechanical lock S2 fixes the connection position between the charging gun and the DC charging socket, keeping the charging gun in a stable plugged-in state and preventing the connection from loosening due to external vibration, vehicle movement, or other factors during charging. After mechanical lock S2 is engaged, a reliable mechanical connection is formed between the charging gun and the charging vehicle, providing a stable connection basis for the detection circuit on the charging vehicle side.

[0049] The mechanical lock S2 not only secures the charging gun but also serves as a mechanical status feedback component during the connection status determination process on the charging vehicle side. When the charging gun is not fully inserted into the DC charging socket of the charging vehicle, the mechanical lock S2 cannot achieve a stable locking state, and the connection between the charging gun and the DC charging socket cannot meet the DC V2V energy transmission requirements. As the charging gun is fully inserted, the mechanical lock S2 enters the locking state, a stable connection is formed between the charging gun and the charging vehicle, and the control device on the charging vehicle side can determine the current connection status based on the electrical state changes generated by the detection circuit.

[0050] Resistor R3 is placed in the charging gun detection circuit, acting as a load element in the voltage division sampling process on the charging vehicle side. Resistor R3, together with other electrical components in the charging vehicle side guidance circuit, forms a detection relationship. When the charging gun connection status changes, the resistance relationship in the detection circuit changes synchronously, causing a change in the voltage at the detection point. The vehicle control device on the charging vehicle side acquires the voltage signal at the detection point and determines whether the charging gun has completed connection and the current operating status based on the voltage change.

[0051] During the DC V2V connection process, the charging gun first establishes a physical connection with the DC charging dock of the charging vehicle. When the charging gun is not connected, the detection circuit on the charging vehicle side remains in its initial state, and the detection point maintains the corresponding initial voltage state. When the charging gun is inserted into the DC charging dock of the charging vehicle, the mechanical lock S2 enters the connection state, and the resistor R3 is connected to the detection circuit, causing a change in the resistance parameter in the detection circuit, and the voltage at the detection point changes accordingly. The vehicle control device on the charging vehicle side determines the connection status of the charging gun based on this voltage change, providing a status judgment basis for the subsequent DC V2V energy receiving process.

[0052] With mechanical lock S2 reliably engaged, a stable mechanical connection is established between the charging gun and the DC charging socket of the charging vehicle. At this point, resistor R3 continues to participate in the detection circuit, maintaining the corresponding detection state through voltage division sampling. The vehicle control device on the charging vehicle side determines whether the charging gun is reliably locked based on whether the voltage at the detection point reaches the corresponding state, and confirms whether the charging vehicle has the connection conditions to receive the output power from the discharging vehicle.

[0053] Resistor R3 plays a crucial role in condition identification during the control and guidance process on the charging gun side. By participating in the detection circuit through resistor R3, different voltage states are generated, enabling the charging vehicle to identify the charging gun connection status and current operating state. When the charging gun is in different connection states, the electrical parameters in the detection circuit change accordingly, and the detection point outputs different voltage values. The vehicle control device then uses the collected voltage information to determine the status. This method utilizes changes in resistance parameters to achieve status identification, eliminating the need for additional status detection equipment.

[0054] The mechanical lock S2 and resistor R3 form a detection structure that correlates mechanical and electrical states. Mechanical lock S2 ensures the reliability of the physical connection between the charging gun and the DC charging socket, while resistor R3 converts changes in connection status into voltage changes in the detection circuit, enabling the vehicle control device to obtain the current status information of the charging gun. Through the combined action of mechanical lock S2 and resistor R3, the charging gun can simultaneously meet the requirements of connection fixation and operational condition identification.

[0055] In DC V2V applications, the charging gun, as the energy receiving side connection component, needs to ensure the safe transmission of electrical energy output from the discharging vehicle to the charging vehicle. The charging gun uses a mechanical lock S2 to reliably lock itself to the DC charging dock of the charging vehicle, preventing energy transmission interruptions due to abnormal connections. Simultaneously, resistor R3 is used as a load for voltage division sampling, enabling the charging vehicle to identify the charging gun's connection status based on voltage changes at the detection point.

[0056] The internal structure of the charging gun combines mechanical connection with electrical detection. Mechanical lock S2 ensures stable fixation between the charging gun and the DC charging socket, guaranteeing a reliable connection during operation. Resistor R3 provides electrical feedback through the detection circuit, enabling the vehicle control device to obtain corresponding operating condition information. This structure allows the charging gun to perform not only traditional connection functions but also status detection during DC V2V control guidance.

[0057] Before the charging vehicle receives electrical energy from the discharging vehicle, the charging gun needs to establish a reliable connection with the DC charging socket of the charging vehicle, and the connection status is confirmed by the mechanical lock S2. Subsequently, resistor R3 participates in the detection circuit to generate a corresponding voltage division sampling signal. The charging vehicle judges the current connection status based on the voltage change at the detection point. When the detection status meets the requirements, the charging vehicle is ready to receive DC V2V electrical energy.

[0058] Through the coordination between mechanical lock S2, resistor R3, and the detection circuit on the charging vehicle side, the charging gun forms a control and guidance structure with connection locking confirmation and operating condition identification functions. This structure utilizes the charging gun's own mechanical lock structure and resistance detection method to complete connection status feedback, enabling the charging vehicle to accurately determine the connection reliability during DC V2V processes, thereby improving the stability and safety of power transmission between vehicles.

[0059] The charging vehicle, acting as the energy receiver in the DC V2V control and guidance circuit, receives electrical energy transmitted from the discharging vehicle and performs connection status identification, operating condition judgment, and signal exchange during the charging and discharging connection process. The charging vehicle consists of a vehicle control unit, power supply U2, and resistors. ,resistance It consists of the vehicle body and DC charging base. These components together form the control and guidance circuit on the charging vehicle side, providing a control basis for establishing a stable and reliable power transmission relationship between the discharging vehicle and the charging vehicle.

[0060] The vehicle control unit is located inside the charging vehicle and serves as a status detection and signal interaction unit during the control guidance process on the charging vehicle side. It is responsible for signal interaction with the internal control loop of the charging vehicle and for collecting voltage changes at detection points on the charging vehicle side. During the DC V2V connection process, the charging vehicle obtains status information from the detection loops on both the discharging and charging vehicle sides through the vehicle control unit, and determines the current connection and operational status based on the voltage changes at the detection points. The vehicle control unit can identify whether the charging / discharging connection device has been successfully connected and, based on the detection results, confirm whether the charging vehicle is capable of receiving electrical energy transmitted from the discharging vehicle.

[0061] After the discharge vehicle and the charging vehicle establish a connection, the charging gun connects to the DC charging socket of the charging vehicle, and the state of the detection circuit on the charging vehicle side changes. The vehicle control device acquires the voltage information of the detection point in real time and determines the current connection status of the charging gun based on the voltage changes. When the voltage at the detection point changes from the initial state to the corresponding connection state, the vehicle control device recognizes that the charging gun has completed the connection and further combines the mechanical locking status to determine whether the current connection is reliable. Through the acquisition and judgment of detection signals by the vehicle control device, the charging vehicle can confirm that the connection status meets the requirements before receiving electrical energy.

[0062] Power supply U2 is located in the control guidance circuit on the charging vehicle side to provide a 12V low-voltage power supply, providing basic power conditions for the detection circuit on the charging vehicle side. Power supply U2 outputs a stable low-voltage voltage, enabling the detection points on the charging vehicle side to form a recognizable voltage state. During the DC V2V connection process, power supply U2 provides operating power to the detection circuit, enabling the resistor... ,resistance Together with other connection structures, they form a stable electrical detection relationship, ensuring that the vehicle control device can accurately collect voltage changes at the detection points.

[0063] resistance It is installed in the detection circuit on the charging vehicle side as a pull-up resistor to stabilize the voltage state at the detection point. Through the resistor... The connection between the sensor and power supply U2 ensures that the detection point remains within a stable voltage range, preventing abnormal fluctuations in the detection signal caused by changes in external connection conditions. (Resistor) It can improve the stability of the detection circuit, enabling the vehicle control device to determine the current connection status of the charging vehicle based on a stable detection voltage.

[0064] resistance With resistance Both components work together to identify the charging vehicle's operating condition. By establishing a specific resistance relationship, changes in the charging gun's connection status and charging / discharging connection status are reflected in the voltage changes at the detection point. When the charging vehicle is in different operating states, the resistance relationship in the detection circuit changes, and the detection point outputs a corresponding voltage signal. The vehicle control device then determines the current operating condition based on the collected voltage changes. This is achieved through resistance... With resistance In conjunction with this, the connection identification and working status judgment of the charging vehicle side can be realized.

[0065] The vehicle body ground serves as a common reference terminal in the charging vehicle-side control guidance circuit, connected to power supply U2 and resistors. ,resistance Together with the DC charging base, they form a complete electrical circuit. The vehicle body ground provides a voltage reference for the detection circuit, ensuring stable reference conditions for voltage changes at the detection point. During DC V2V operation, the vehicle body ground participates in the transmission of detection signals, providing a reliable electrical connection basis for the control and guidance circuit on the charging vehicle side.

[0066] The DC charging socket serves as the connection interface between the charging vehicle and the charging gun, enabling the connection between the charging vehicle's control guidance circuit and external connection devices. The charging vehicle receives electrical energy from the discharging vehicle through the DC charging socket, while simultaneously establishing a detection signal transmission channel. When the charging gun is connected to the DC charging socket, the charging vehicle's detection circuit forms a complete connection, allowing the vehicle control device to collect voltage changes at the corresponding detection points and determine the current connection status.

[0067] During the DC V2V connection process, the charging vehicle is initially in a waiting state to receive electrical energy, during which the vehicle control device continuously monitors the voltage at the charging vehicle's detection point. When the charging gun is inserted into the DC charging socket, the internal resistance of the charging gun and the mechanical locking structure change the state of the detection circuit on the charging vehicle's side. The combined effect of resistor R5' and resistor R5' generates a corresponding voltage change. The vehicle control device uses this voltage change to determine whether the charging gun has been successfully connected and to confirm whether the vehicle is ready to receive electrical energy.

[0068] Once the charging / discharging connection is established and reliably locked, the low-voltage guide signal output from the discharging vehicle side is transmitted to the charging vehicle side. The charging vehicle then interacts with the signal via its vehicle control device. The vehicle control device, based on changes in the detection point voltage, determines whether the current connection status meets the DC V2V operating conditions. When the detection result meets the requirements, the charging vehicle is ready to receive electrical energy from the discharging vehicle.

[0069] The charging vehicle-side control guidance structure utilizes the vehicle control device, power supply U2, and resistors. ,resistance The system establishes the connection between the vehicle body, ground, and DC charging dock to enable vehicle-side connection detection and operational status identification. The vehicle control unit handles signal interaction and detection, while power supply U2 provides 12V low-voltage power. (The last part, "resistance," appears to be incomplete and unrelated to the preceding sentence.) Responsible for detecting voltage stability and resistance at the detection point. With resistance Together, they complete the working condition identification, with the vehicle body providing a reference for the detection circuit and the DC charging socket completing the external connection.

[0070] With the above structure, the charging vehicle can complete connection status confirmation and operating condition judgment before receiving electrical energy from the discharging vehicle, improving the reliability of DC V2V power transmission. The charging vehicle-side control guidance circuit uses a low-voltage detection method to achieve status identification, eliminating the need for additional detection equipment. While meeting the signal interaction requirements between vehicles, it also meets the control requirements for the charging vehicle to safely receive electrical energy during DC V2V transmission.

[0071] Example: The DC V2V control and guidance circuit achieves vehicle connection status identification, mechanical lock-up status detection, and external discharge control through electrical coordination between the discharge vehicle-side detection circuit, the charging vehicle-side detection circuit, and the charging / discharging connection device. During the DC V2V connection process, the parameters of each detection circuit remain within a preset range, and the current connection condition is reflected by the voltage change at the detection point. The resistance parameters in the discharge vehicle, charging vehicle, discharge vehicle plug, and charging vehicle plug are all in the form of equivalent resistance. Some parameters can be customized according to vehicle manufacturing requirements to meet the application needs of different vehicle structures and different charging / discharging connection devices.

[0072] The parameters of the DC V2V control guide circuit are shown in the table below: The aforementioned resistance parameters maintain the required accuracy under environmental conditions and within their service life; some resistance parameters can be customized by the vehicle manufacturer according to vehicle design requirements. By setting different resistance values, different voltage states at detection points can be generated, providing a basis for the vehicle control device to identify connection and operating status.

[0073] During DC V2V operation, before the charging / discharging connection device is connected, both the discharge vehicle-side detection circuit and the charging vehicle-side detection circuit are in their initial state. At this time, the discharge vehicle-side detection point... The voltage is maintained at 12V at detection point 2 on the charging vehicle side, and the voltage at detection point 2 on the discharging vehicle side is maintained at 12V. The voltage remains at 0V, and the voltage at detection point 1 on the charging vehicle side remains at 0V. This state indicates that a complete connection has not yet been established between the discharging vehicle, the charging vehicle, and the charging / discharging connection device. The vehicle control device continuously collects the voltage status of the detection point and determines that the connection operation state has not yet been entered based on the initial voltage status.

[0074] When the discharge gun is connected to the vehicle via the V2V discharge plug, the discharge gun is inserted into the vehicle's DC charging socket, and the mechanical connection structure enters the connected state. Simultaneously, the resistance relationship in the vehicle's detection circuit changes. Because the discharge plug terminal resistor R2 is connected to the detection circuit, the detection point... The voltage jumps from 12V before connection to 6V, while the voltage at detection point 2 on the charging vehicle side remains at 12V, and the voltage at the discharging vehicle side detection point... The voltage remains at 0V, and the voltage at detection point 1 on the charging vehicle side remains at 0V.

[0075] This status indicates that the discharging vehicle has completed the discharge plug connection, but the charging vehicle has not yet completed the connection. The vehicle control unit determines the connection based on the detection point. The voltage changes from 12V to 6V, indicating that the connection device on the discharge vehicle side has been connected, while simultaneously waiting for a change in the connection status on the other end. In this way, the discharge vehicle can identify the current connection status of the discharge plug and avoid outputting power before the connection is fully established.

[0076] Subsequently, the charging gun is connected to the charging vehicle via the V2V charging plug, and inserted into the DC charging socket of the charging vehicle. This causes a change in the resistance relationship in the detection circuit on the charging vehicle side. At this time, the voltage at detection point 2 of the charging vehicle side guide circuit jumps from 12V to 6V, while the voltage at the discharging vehicle side detection point... The voltage is maintained at 6V, and the discharge vehicle side detection point is used. The voltage remains at 0V, and the voltage at detection point 1 on the charging vehicle side remains at 0V.

[0077] When the vehicle side detection point is discharged After both the voltage at detection point 2 on the charging vehicle side changed from 12V to 6V, it indicates that the discharge plug and charging plug of the V2V gun have been successfully connected, forming a complete connection between the two ends of the equipment. The vehicle control device then passes through the detection point... The voltage and voltage change at detection point 2 determine whether the equipment is reliably connected and confirm that the current DC V2V connection device has the conditions for further lockout detection.

[0078] After the connection test is completed, mechanical locks S1 and S2 are closed to confirm the locking between the discharge gun and the DC charging socket of the discharge vehicle, and between the charging gun and the DC charging socket of the charging vehicle. After mechanical locks S1 and S2 reliably lock, a stable mechanical connection is formed between the discharge vehicle and the charging vehicle, providing a connection basis for subsequent low-voltage guidance signal transmission and DC V2V discharge process.

[0079] After mechanical locks S1 and S2 are reliably locked, the external V2V discharge switch is clicked on the discharge vehicle's large screen, and the discharge vehicle enters the external discharge control state. The low-voltage auxiliary power supply controls relays K3 and K4 to close, outputting a 12V low-voltage voltage to provide power to the detection circuit. At this time, the detection point on the discharge vehicle side... The voltage jumped from 0V to 4V, and the voltage at detection point 1 on the charging vehicle side also jumped from 0V to 4V. The voltage at both detection point 2 and the voltage at detection point 2 remain at 6V.

[0080] This status indicates that the equipment has completed connection and locking confirmation, the discharging vehicle is ready to output electrical energy, and the charging vehicle is ready to receive electrical energy transmission. The vehicle control device judges the reliability of the equipment connection by detecting the voltage at point 2' and the voltage jump status at point 2, and judges the reliability of the mechanical locking by detecting the voltage at point 1' and the voltage change status at point 1. When all the above detection statuses meet the requirements, the discharging vehicle is allowed to perform DC V2V discharging.

[0081] The entire DC V2V control guidance process utilizes changes in the voltage state of detection points to achieve multi-stage state recognition. In the initial state, the detection point... Maintaining 12V at detection point 2 indicates that the charging / discharging connection is not complete; after the discharge plug is connected, the discharge vehicle side detection point... The voltage changes from 12V to 6V, indicating that the connection on the vehicle side is complete. After the charging plug is connected, the voltage at detection point 2 on the charging vehicle side changes from 12V to 6V, indicating that both ends of the charging and discharging connection device are connected. After the mechanical locks S1 and S2 are closed and external discharge is initiated, the voltage at detection point... When the voltage at detection point 1 changes from 0V to 4V, it indicates that the mechanical locking state has been confirmed.

[0082] Through the above control and guidance process, the DC V2V control and guidance circuit utilizes a low-voltage detection signal to achieve state interaction between the discharging vehicle and the charging vehicle. The discharging vehicle passes the detection point. and testing points After completing the connection and lockout status determination, the charging vehicle identifies the corresponding status through detection points 2 and 1. The vehicle control device controls the working state of relays K3 and K4 based on the voltage changes at the detection points, thereby achieving safe and reliable DC V2V energy transmission control. This control method utilizes the vehicle's own low-voltage auxiliary power supply, resistance detection circuit, and mechanical lock structure to complete connection identification and discharge authorization determination, improving the reliability of DC V2V applications.

[0083] This invention utilizes a DC V2V control and guidance circuit design to achieve accurate identification of the vehicle connection status through the coordinated detection circuits between the discharging vehicle, the charging / discharging connection device, and the charging vehicle. The vehicle control device determines whether the charging / discharging connection device has completed the connection based on the voltage change at the detection point, avoiding power transmission when the connection status is not confirmed and improving the connection reliability during DC V2V power replenishment.

[0084] This invention utilizes a combination of mechanical locks and a detection circuit to detect the locking status of the charging / discharging connection device. After mechanical locks S1 and S2 lock, the voltage at the detection point changes accordingly. The vehicle control device determines the stability of the mechanical connection based on the voltage status, thereby improving the safety of energy transfer between vehicles and reducing abnormal situations caused by loose connections.

[0085] This invention provides guidance signals by reusing the vehicle's low-voltage auxiliary power supply, eliminating the need for an independent external control power supply structure and simplifying the DC V2V control guidance circuit. A resistance detection circuit is used to identify operating conditions, and based on the detection results, relays K3 and K4 are controlled to output low-voltage signals, enabling the discharging vehicle to safely discharge while ensuring the charging vehicle can reliably receive power.

[0086] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A design method for a DC V2V control and guidance circuit, characterized in that, Includes the following steps: Construct a DC V2V control and guidance circuit for the discharge vehicle side, with the discharge vehicle serving as the energy output terminal. This includes a vehicle control unit, a low-voltage auxiliary power supply, relays K3 and K4, and a power supply. Resistor R4, resistor R5, vehicle ground and DC charging socket, vehicle control device collects and detects voltage changes at detection points, resistor R4 and resistor R5 form a working condition identification circuit; A discharge gun is set up to connect to the discharge vehicle. The discharge gun includes a mechanical lock S1 and a custom resistor R2. The mechanical lock S1 is connected to the DC charging socket and locks it. The resistor R2 is connected to the mechanical lock S1 and the vehicle ground to form a detection branch. Voltage sampling and charging / discharging status identification are achieved by changing the resistance value of resistor R2. A charging gun is set up to connect to the charging vehicle. The charging gun includes a mechanical lock S2, a resistor R1 and a resistor R3. The mechanical lock S2 is connected to the DC charging socket of the charging vehicle and locks it. The resistor R3 forms a detection load for collecting the voltage at the detection point on the side of the charging vehicle. The charging vehicle-side circuit is configured with a DC V2V control and guidance circuit, with the charging vehicle acting as the energy receiver. It includes a vehicle control unit, power supply U2, and a resistor. ,resistance The vehicle control device determines the connection and lock-up status based on the voltage changes at the detection points on the discharging vehicle side and the charging vehicle side, and controls relays K3 and K4 to output low-voltage guidance signals.

2. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, The low-voltage auxiliary power supply in the discharge vehicle side circuit is used to provide 12V low-voltage power. After the discharge vehicle is connected and locked to the charging and discharging connection device, the vehicle control device controls relays K3 and K4 to close, so that the low-voltage auxiliary power supply outputs a 12V low-voltage signal to the detection circuit and transmits a low-voltage guidance signal to the charging vehicle side.

3. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, Power supply in the vehicle-side circuit of the discharge vehicle The resistor R5 is used to provide the working voltage of the detection circuit. The resistor R4 acts as a pull-up resistor to stabilize the voltage at the detection point. The resistor R4 and resistor R5 work together to form the working condition identification circuit. The charging and discharging connection status is determined by the change in the voltage at the detection point.

4. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, The custom resistor R2 in the discharge gun is configured with a resistance value according to the capacity of the charging and discharging connection cable. The resistor R2 is connected to the mechanical lock S1 and the vehicle body ground to form a load circuit. The voltage drop generated by the resistor R2 realizes the identification of the working conditions corresponding to different cable capacities.

5. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, Mechanical lock S1 is used to detect the connection status between the discharge gun and the DC charging socket of the discharge vehicle. When mechanical lock S1 is locked, the detection circuit on the discharge vehicle side generates a corresponding voltage change, and the vehicle control device determines the locking status of the discharge gun based on the voltage at the detection point.

6. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, The mechanical lock S2 in the charging gun is used to reliably lock the charging gun and the DC charging socket of the charging vehicle. The resistor R3 serves as a detection load on the charging vehicle side, and identifies the connection status of the charging gun by detecting the voltage change at the detection point.

7. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, Power supply U2 in the charging vehicle side circuit is used to provide a 12V low-voltage power supply, resistor As the pull-up resistor stabilizes the detection voltage, the resistor... With resistance Together they form a working condition identification loop, used to determine the connection status on the charging vehicle side.

8. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, The vehicle control device collects data from the vehicle-side detection points during discharge. The voltage and voltage changes at detection point 2 on the charging vehicle side determine the connection status of the charging / discharging connection device. When the detection point... When the voltage at detection point 2 changes from 12V to 6V, it confirms that both the discharge gun and the charging gun are successfully connected.

9. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, The vehicle control device collects data from the vehicle-side detection points during discharge. The voltage and voltage change at detection point 1 on the charging vehicle side determine the mechanical locking status. Once mechanical locks S1 and S2 have locked, the detection point... The voltage at detection point 1 changed from 0V to 4V.

10. The DC V2V control and guidance circuit design method according to claim 1, characterized in that, After confirming that the charging and discharging connection device is reliably connected and mechanically locked, the vehicle control device controls relays K3 and K4 to close, so that the discharging vehicle outputs a low-voltage guiding signal, which satisfies the V2V discharging conditions of the discharging vehicle and the energy receiving and transmission conditions of the charging vehicle.

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