Power supply system and control method for parent-child vehicle

Abstract

The present invention relates to the field of charging control technology, and specifically discloses a power supply system and control method for a mother-child vehicle. The system includes: a double-head charging and discharging gun, a mother vehicle power battery, a child vehicle power battery, a mother vehicle whole vehicle controller, and a child vehicle whole vehicle controller; the double-head charging and discharging gun is used to transmit the charging plug gun signal to the child vehicle whole vehicle controller when inserted into the mother vehicle charging and discharging port and the child vehicle charging and discharging port; the child vehicle whole vehicle controller is used to collect the child vehicle power signal of the child vehicle power battery, and transmit the child vehicle power signal to the mother vehicle whole vehicle controller through the double-head charging and discharging gun when receiving the charging plug gun signal; the mother vehicle whole vehicle controller is used to collect the mother vehicle power signal of the mother vehicle power battery, and control the mother vehicle power battery to the charging and discharging state of the child vehicle power battery according to the comparison result of the obtained child vehicle power signal and the mother vehicle power signal. By giving the power of the child vehicle power battery to the mother vehicle power battery, the mother vehicle has a larger battery capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of charging control, and in particular to a power supply system and control method for a multi-purpose vehicle. Background Art

[0002] The commercial vehicle tandem truck system utilizes a specially designed transport model, primarily for cargo transportation. This model achieves cost savings and improves efficiency by placing one vehicle on top of another. In this model, one vehicle can load another without returning empty, reducing single-sided cargo transportation costs. This model also reduces tolls and fuel costs (for gasoline-powered vehicles), while also reducing tire wear and extending tire life, further saving costs.

[0003] Currently, most new energy commercial vehicles utilize rear-mounted or side-mounted battery packs. To achieve longer range, large-capacity battery packs are often used for long-distance transport, or battery swapping is employed to improve transport efficiency. The primary limitations of the new energy commercial vehicle parent-child transport model include difficulty and time spent charging, and the small battery pack capacity and resulting short range.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a power supply system and control method for a mother-and-child vehicle, aiming to solve the technical problem of small battery pack capacity and short cruising range in the mother-and-child vehicle transportation mode in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides a power supply system for a mother-and-child vehicle, the power supply system comprising: a double-head charging and discharging gun, a mother vehicle power battery, a child vehicle power battery, a mother vehicle whole vehicle controller, and a child vehicle whole vehicle controller;

[0007] One end of the double-headed charge and discharge gun is connected to the first end of the power battery of the mother vehicle through the charge and discharge port of the mother vehicle, and the other end of the double-headed charge and discharge gun is connected to the first end of the power battery of the sub-vehicle through the charge and discharge port of the sub-vehicle. The second end of the power battery of the mother vehicle is connected to the vehicle controller of the mother vehicle, and the second end of the power battery of the sub-vehicle is connected to the vehicle controller of the sub-vehicle;

[0008] The double-head charging and discharging gun is used to transmit the charging gun signal to the vehicle controller of the sub-vehicle when it is inserted into the charging and discharging port of the mother vehicle and the charging and discharging port of the sub-vehicle;

[0009] The sub-vehicle whole vehicle controller is used to collect the sub-vehicle power signal of the sub-vehicle power battery, and transmit the sub-vehicle power signal to the mother vehicle whole vehicle controller through the double-head charging and discharging gun when receiving the charging gun signal;

[0010] The mother vehicle controller is used to collect the mother vehicle power signal of the mother vehicle power battery, and control the mother vehicle power battery to the charging and discharging state of the sub-vehicle power battery according to the comparison result between the acquired sub-vehicle power signal and the mother vehicle power signal.

[0011] In one embodiment, the mother-car power supply system includes: a mother car main positive relay, a mother car main negative relay, a mother car charging positive relay and a mother car charging negative relay;

[0012] The first end of the mother vehicle main positive relay is connected to the positive electrode of the mother vehicle power battery and the first end of the mother vehicle charging positive relay at the same time, the second end of the mother vehicle main positive relay is connected to the mother vehicle total positive power line, the second end of the mother vehicle charging positive relay is connected to the mother vehicle charging and discharging port, the first end of the mother vehicle negative positive relay is connected to the negative electrode of the mother vehicle power battery and the first end of the mother vehicle charging negative relay at the same time, the second end of the mother vehicle main negative relay is connected to the mother vehicle total negative power line, and the second end of the mother vehicle charging negative relay is connected to the mother vehicle charging and discharging port.

[0013] In one embodiment, the parent-child vehicle power supply system further comprises: a child vehicle main positive relay, a child vehicle main negative relay, a child vehicle charging positive relay, and a child vehicle charging negative relay;

[0014] The first end of the sub-vehicle main positive relay is connected to the positive electrode of the sub-vehicle power battery and the first end of the sub-vehicle charging positive relay at the same time. The second end of the sub-vehicle main positive relay is connected to the sub-vehicle total positive power line. The second end of the sub-vehicle charging positive relay is connected to the sub-vehicle charging and discharging port. The first end of the sub-vehicle negative positive relay is connected to the negative electrode of the sub-vehicle power battery and the first end of the sub-vehicle charging negative relay at the same time. The second end of the sub-vehicle main negative relay is connected to the sub-vehicle total negative power line. The second end of the sub-vehicle charging negative relay is connected to the sub-vehicle charging and discharging port.

[0015] In addition, to achieve the above-mentioned purpose, the present invention further proposes a power supply control method for a parent-child vehicle, which is applied to the parent-child vehicle power supply system as described above, and the method includes:

[0016] Obtaining the power signal of the mother vehicle power battery and the power signal of the sub vehicle power battery;

[0017] Calculating the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold;

[0018] The charge and discharge states of the power battery of the mother vehicle and the power battery of the child vehicle are controlled according to the comparison result of the power difference and the preset power threshold.

[0019] In one embodiment, after the step of determining the wearing condition of the headset according to the posture signal when the trigger instruction is received, the method further includes:

[0020] When the headset is in a wearing state, the power management module is driven to execute a preset action corresponding to the trigger instruction.

[0021] In one embodiment, the step of controlling the charge and discharge states of the power battery of the parent vehicle and the power battery of the child vehicle according to the comparison result of the power difference and the preset power threshold includes:

[0022] When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the sub-vehicle are controlled to supply power in parallel.

[0023] In one embodiment, the step of controlling the charge and discharge states of the power battery of the parent vehicle and the power battery of the child vehicle according to the comparison result of the power difference and the preset power threshold includes:

[0024] When the power difference is higher than the preset power threshold, detecting whether the power supply system of the parent-child vehicle is in a parking state;

[0025] If the vehicle is in a non-parking state, comparing the power signal of the mother vehicle with the power signal of the child vehicle;

[0026] According to the comparison result, the power battery with higher power is selected from the power battery of the mother vehicle and the power battery of the sub-vehicle for power supply.

[0027] In one embodiment, after the step of selecting the power battery with higher power from the power battery of the mother vehicle and the power battery of the child vehicle for power supply based on the comparison result, the method further includes:

[0028] Continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold;

[0029] When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

[0030] In one embodiment, after the step of detecting whether the power supply system of the parent vehicle is in a parked state when the power difference is higher than the preset power threshold, the method further includes:

[0031] If the vehicle is in a parked state, the power signal of the mother vehicle and the power signal of the child vehicle are compared;

[0032] According to the comparison result, the power battery with higher power is selected from the power battery of the mother vehicle and the power battery of the child vehicle to charge the other power battery.

[0033] In one embodiment, after the step of selecting, based on the comparison result, the power battery with a higher power level from the power battery of the mother vehicle and the power battery of the child vehicle to charge the other power battery, the method further includes:

[0034] Continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold;

[0035] When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

[0036] In one embodiment, the step of obtaining the power signal of the mother vehicle power battery and the power signal of the sub-vehicle power battery includes:

[0037] Determine whether the voltage platforms of the power battery of the mother vehicle and the power battery of the child vehicle are consistent;

[0038] If they are consistent, determine whether the dual-head charge and discharge gun is connected to the charge and discharge port;

[0039] If inserted, the mother vehicle power signal of the mother vehicle power battery and the sub-vehicle power signal of the sub-vehicle power battery are obtained.

[0040] The technical solution of the present invention proposes a power supply system and control method for a mother-child vehicle. The mother-child vehicle power supply system includes: a double-head charging and discharging gun, a mother vehicle power battery, a sub-vehicle power battery, a mother vehicle whole vehicle controller and a sub-vehicle whole vehicle controller; one end of the double-head charging and discharging gun is connected to the first end of the mother vehicle power battery through the mother vehicle charging and discharging port, the other end of the double-head charging and discharging gun is connected to the first end of the sub-vehicle power battery through the sub-vehicle charging and discharging port, the second end of the mother vehicle power battery is connected to the mother vehicle whole vehicle controller, and the second end of the sub-vehicle power battery is connected to the sub-vehicle whole vehicle controller; the double-head charging and discharging gun is used to be inserted into the mother vehicle charging and discharging port. When the sub-vehicle charging and discharging port is connected to the sub-vehicle, the charging gun signal is transmitted to the sub-vehicle vehicle controller; the sub-vehicle vehicle controller is used to collect the sub-vehicle power signal of the sub-vehicle power battery, and when receiving the charging gun signal, the sub-vehicle power signal is transmitted to the mother vehicle controller through the double-headed charging and discharging gun; the mother vehicle controller is used to collect the mother vehicle power signal of the mother vehicle power battery, and control the mother vehicle power battery to the charging and discharging state of the sub-vehicle power battery according to the comparison result of the obtained sub-vehicle power signal and the mother vehicle power signal. By setting the double-headed charging and discharging gun between the sub-vehicle and the mother vehicle, the power of the sub-vehicle power battery is used for the mother vehicle power battery, so that the mother vehicle has a larger battery capacity, reduces the distance to find the charging pile during transportation and shortens the number of charging times, and improves the cruising range of the new energy commercial vehicle when the mother vehicle and the sub-vehicle are transported back to back. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a structural diagram of the first embodiment of the power supply system for the parent-child vehicle proposed by the present invention;

[0042] Figure 2 This is a schematic structural diagram of the hardware control in the first embodiment of the power supply system for the parent-child vehicle proposed by the present invention;

[0043] Figure 3 This is a schematic diagram of the architecture of the second embodiment of the power supply system for the parent-child vehicle proposed by the present invention;

[0044] Figure 4 This is a flow chart of the first embodiment of the power supply control method for the parent-child vehicle proposed by the present invention;

[0045] Figure 5 This is a flow chart of the second embodiment of the power supply control method for the parent-child vehicle proposed in the present invention.

[0046] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] Reference Figure 1 , Figure 1 This is a structural diagram of the first embodiment of the power supply system for the parent-child vehicle proposed by the present invention. Figure 1 A first embodiment of a power supply system for a parent-child vehicle of the present invention is provided.

[0052] In this embodiment, the power supply system of the mother-child vehicle includes: a double-head charge and discharge gun 10, a mother vehicle power battery 20, a sub-vehicle power battery 30, a mother vehicle whole vehicle controller 21 and a sub-vehicle whole vehicle controller 31; one end of the double-head charge and discharge gun 10 is connected to the first end of the mother vehicle power battery 20 through the mother vehicle charge and discharge port 22, and the other end of the double-head charge and discharge gun 10 is connected to the first end of the sub-vehicle power battery 30 through the sub-vehicle charge and discharge port 32, the second end of the mother vehicle power battery 20 is connected to the mother vehicle whole vehicle controller 21, and the second end of the sub-vehicle power battery 30 is connected to the sub-vehicle whole vehicle controller 31.

[0053] It should be noted that the dual-head charge and discharge gun 10 can be used to transmit the charging gun signal to the sub-vehicle vehicle controller when inserted into the mother vehicle charge and discharge port 22 and the sub-vehicle charge and discharge port 32; the sub-vehicle vehicle controller 31 can be used to collect the sub-vehicle power signal of the sub-vehicle power battery 30, and when receiving the charging gun signal, transmit the sub-vehicle power signal to the mother vehicle controller 21 through the dual-head charge and discharge gun 10; the mother vehicle controller 21 can be used to collect the mother vehicle power signal of the mother vehicle power battery 20, and control the mother vehicle power battery 20 to the charging and discharging state of the sub-vehicle power battery 30 according to the comparison result between the obtained sub-vehicle power signal and the mother vehicle power signal.

[0054] It should be understood that a parent-child transport system can be a transport mode in which one vehicle is loaded onto another. After the two vehicles transport the goods, the parent vehicle is used to load the child vehicle for the return trip. In this solution, both the parent vehicle and the child vehicle are new energy commercial vehicles, including a battery management system (BMS) and a vehicle control unit (VCU).

[0055] Furthermore, the dual-head charging gun 10 can be a device for charging new energy vehicles, capable of connecting the mother vehicle power battery 20 and the child vehicle power battery 30, enabling mutual charging and discharging between the two vehicles' power batteries. Both sides of the dual-head charging gun 10 are connected to the charging and discharging ports of the mother vehicle and the child vehicle via high-voltage wires. For vehicles charging with a single gun, the physical connection is a single high-voltage wire, while for vehicles charging with two guns, two high-voltage wires are used to improve charging and discharging efficiency. The dual-head charging gun 10 is also equipped with a CAN line to transmit charging and discharging related signals.

[0056] It should be noted that each vehicle's charging and discharging ports are connected to their respective power battery management systems (BMSs) via hardwires and CAN lines. The hardwires transmit charging and discharging energy, while the CAN lines transmit charging and discharging-related signals. The BMS identifies the charging plug signal and the battery's State of Charge (SOC) signal, which it then returns via the CAN line to the VCU for high-voltage charging and discharging operations. Simultaneously, the BMS receives high-voltage power-on and power-off requests from the VCU to control the on / off of the vehicle's related relays.

[0057] It should be understood that when the dual-head charge and discharge gun 10 is connected to the charge and discharge ports of the two vehicles, it will send a charging gun signal to the VCU of the two vehicles so that the VCU can confirm that the charging and discharge gun is successfully connected. Each VCU can obtain the remaining power signal of the BMS, and at the same time, each BMS can transmit the remaining power signal to the BMS and VCU of the other vehicle through the dual-head charge and discharge gun 10. For example: when the sub-vehicle vehicle controller 31 receives the charging gun signal from the dual-head charge and discharge gun 10, it controls the sub-vehicle power battery 30 to transmit the sub-vehicle power signal to the mother vehicle power battery 20 through the dual-head charge and discharge gun 10, and then transmits the sub-vehicle power signal and the mother vehicle power signal to the mother vehicle controller 21 through the CAN line. The mother vehicle controller 21 can control the mother vehicle-related relays according to the size of the sub-vehicle power signal and the mother vehicle power signal to control the charge and discharge status of the mother vehicle power battery 20, and transmit the charging control signal to the sub-vehicle vehicle controller 31 to control the sub-vehicle-related relays to control the charge and discharge status of the sub-vehicle power battery 30.

[0058] In one possible implementation, when the difference between the power signal of the mother vehicle and the power signal of the child vehicle is lower than a preset threshold value (for example, 5%), it is determined that the power batteries of the current mother and child vehicles are in a parallel expansion state, that is, the child vehicle power battery 30 and the mother vehicle power battery 20 in the parallel expansion state simultaneously supply power to the mother vehicle, the capacity of the mother vehicle power battery 20 is expanded, and the current total battery capacity is the sum of the capacity of the mother vehicle power battery 20 and the capacity of the child vehicle power battery 30. When the difference between the power signal of the mother vehicle and the power signal of the child vehicle is higher than a preset threshold value (for example, 5%), it is determined that the vehicle with high power needs to discharge the vehicle with low power, and the vehicle with low power performs charging. When the difference between charging and discharging SOC is lower than the above-mentioned preset threshold value (for example, 5%), the parallel expansion state of the power battery can be continued.

[0059] Further, refer to Figure 2 , Figure 2 This is a schematic diagram of the hardware control structure of the first embodiment of the parent-child vehicle power supply system proposed by the present invention. The parent-child vehicle power supply system also includes: an IC instrument, a motor control unit (MCU) and an integrated thermal management system (TMS).

[0060] It should be noted that the instrument IC receives charging status and other signals sent by the vehicle control unit (VCU) via CAN and displays them numerically, indicating the power battery charge level during charging and discharging, as well as information such as the vehicle's available range. The integrated thermal management controller (TMS) collects battery status information, MCU motor controller status, and other temperature information of components requiring heat dissipation or heating via CAN lines during power battery connection. It then drives thermal management components such as the electronic fan, water pump, air conditioner, heating PTC, and solenoid valve via hardwires or signal lines to heat or cool the battery during charging and discharging.

[0061] In this embodiment, the power supply system of the mother-child vehicle includes: a double-head charging and discharging gun, a mother vehicle power battery, a sub-vehicle power battery, a mother vehicle whole vehicle controller and a sub-vehicle whole vehicle controller; one end of the double-head charging and discharging gun is connected to the first end of the mother vehicle power battery through the mother vehicle charging and discharging port, the other end of the double-head charging and discharging gun is connected to the first end of the sub-vehicle power battery through the sub-vehicle charging and discharging port, the second end of the mother vehicle power battery is connected to the mother vehicle whole vehicle controller, and the second end of the sub-vehicle power battery is connected to the sub-vehicle whole vehicle controller; the double-head charging and discharging gun is used to be inserted into the mother vehicle When the charging and discharging port and the charging and discharging port of the sub-vehicle are connected, the charging plug signal is transmitted to the vehicle controller of the sub-vehicle; the vehicle controller of the sub-vehicle is used to collect the sub-vehicle power signal of the sub-vehicle power battery, and when receiving the charging plug signal, the sub-vehicle power signal is transmitted to the vehicle controller of the mother vehicle through the double-headed charging and discharging gun; the mother vehicle controller is used to collect the mother vehicle power signal of the mother vehicle power battery, and control the mother vehicle power battery to the charging and discharging state of the sub-vehicle power battery according to the comparison result of the obtained sub-vehicle power signal and the mother vehicle power signal. By setting the double-headed charging and discharging gun between the sub-vehicle and the mother vehicle, the power of the sub-vehicle power battery is used for the mother vehicle power battery, so that the mother vehicle has a larger battery capacity, reduces the distance to find the charging pile during transportation and shortens the number of charging times, and improves the cruising range of the new energy commercial vehicle when the mother vehicle and the sub-vehicle are transported back and forth.

[0062] Reference Figure 3 , Figure 3 This is a schematic diagram of the architecture of the second embodiment of the parent-child vehicle power supply system proposed in the present invention. Based on the first embodiment of the parent-child vehicle power supply system, the second embodiment of the parent-child vehicle power supply system of the present invention is proposed.

[0063] In this embodiment, the power supply system of the mother-child vehicle includes: a mother vehicle main positive relay K1, a mother vehicle main negative relay K2, a mother vehicle charging positive relay K3 and a mother vehicle charging negative relay K4.

[0064] Among them, the first end of the mother vehicle main positive relay K1 is simultaneously connected to the positive pole of the mother vehicle power battery 20 and the first end of the mother vehicle charging positive relay K3, the second end of the mother vehicle main positive relay K1 is connected to the mother vehicle total positive power line, the second end of the mother vehicle charging positive relay K3 is connected to the mother vehicle charging and discharging port 22, the first end of the mother vehicle negative positive relay K2 is simultaneously connected to the negative pole of the mother vehicle power battery 20 and the first end of the mother vehicle charging negative relay K4, the second end of the mother vehicle main negative relay K2 is connected to the mother vehicle total negative power line, and the second end of the mother vehicle charging negative relay K4 is connected to the mother vehicle charging and discharging port 22.

[0065] Furthermore, the parent-child vehicle power supply system further includes: a child vehicle main positive relay K5, a child vehicle main negative relay K6, a child vehicle charging positive relay K7 and a child vehicle charging negative relay K8;

[0066] Among them, the first end of the sub-vehicle main positive relay K5 is simultaneously connected to the positive electrode of the sub-vehicle power battery 30 and the first end of the sub-vehicle charging positive relay K7, the second end of the sub-vehicle main positive relay K5 is connected to the sub-vehicle total positive power line, the second end of the sub-vehicle charging positive relay K7 is connected to the sub-vehicle charging and discharging port 32, the first end of the sub-vehicle negative positive relay K6 is simultaneously connected to the negative electrode of the sub-vehicle power battery 30 and the first end of the sub-vehicle charging negative relay K8, the second end of the sub-vehicle main negative relay K6 is connected to the sub-vehicle total negative power line, and the second end of the sub-vehicle charging negative relay K8 is connected to the sub-vehicle charging and discharging port 32.

[0067] It should be noted that the main positive power line and the main negative power line of the above-mentioned mother vehicle and sub-vehicle are power buses for the power battery to supply power to various high-voltage devices on the vehicle.

[0068] It should be understood that the operating modes of the power batteries of the mother vehicle and the sub-vehicle may include: (1) parallel expansion mode, in which the mother vehicle power battery 20 and the sub-vehicle power battery 30 are connected in parallel to supply power, and the charging positive relay, charging negative relay, main positive relay and main negative relay of the mother vehicle and the sub-vehicle are all closed. (2) battery charging and discharging mode: the mother vehicle power battery 20 supplies power to the sub-vehicle power battery 30 or the sub-vehicle power battery 30 supplies power to the mother vehicle power battery 20, the charging positive relay, charging negative relay and main negative relay of the mother vehicle and the sub-vehicle are closed, and the main positive relay is disconnected. (3) mother vehicle single battery power supply mode: only the mother vehicle power battery is used to power the mother vehicle for driving, the charging positive relay and charging negative relay of the mother vehicle and the sub-vehicle are both disconnected, the mother vehicle main positive relay K1 and the mother vehicle main negative relay K2 are closed, and the sub-vehicle main positive relay K5 and the sub-vehicle main negative relay K6 are disconnected. (4) Sub-vehicle single battery power supply mode: Only the sub-vehicle power battery is used to power the mother vehicle. The sub-vehicle main negative relay K6, the sub-vehicle charging positive relay K7 and the sub-vehicle charging negative relay K8 are closed, the sub-vehicle main positive relay K5 is disconnected, the mother vehicle main positive relay K1, the mother vehicle charging positive relay K3 and the mother vehicle charging negative relay K4 are closed, and the mother vehicle main negative relay K2 is disconnected.

[0069] In this embodiment, the power supply system for the mother-carriage vehicle includes: a mother-carriage main positive relay, a mother-carriage main negative relay, a mother-carriage charging positive relay, and a mother-carriage charging negative relay. Simultaneously, the power supply system for the mother-carriage vehicle also includes: a sub-carriage main positive relay, a sub-carriage main negative relay, a sub-carriage charging positive relay, and a sub-carriage charging negative relay. The mother-carriage vehicle controller and the sub-carriage vehicle controller control the closed state of each relay, thereby controlling the battery charge and discharge mode. This achieves the effect of expanding the power battery capacity of the mother-carriage vehicle and the sub-carriage vehicle, allowing for mutual charging and discharging. This gives the mother-carriage vehicle a larger battery capacity, reduces the distance required to find a charging station during transportation, and shortens the number of charging times.

[0070] In addition, the present invention also proposes a power supply control method for a parent-child vehicle. Figure 4 , Figure 4 This is a flow chart of the first embodiment of the power supply control method for the parent-child vehicle proposed by the present invention. The power supply control method for the parent-child vehicle includes:

[0071] Step S10: obtaining a mother vehicle power signal from a mother vehicle power battery and a sub-vehicle power signal from a sub-vehicle power battery.

[0072] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program execution functions, or an electronic device capable of performing the above functions. For example, the above-mentioned parent-child car power supply system is used as an example to illustrate this embodiment and the following embodiments.

[0073] It should be understood that the mother vehicle's power signal can be obtained by the mother vehicle's vehicle controller directly from the mother vehicle's BMS via the CAN line. The sub-vehicle's power signal can be obtained by transmitting the sub-vehicle's power battery to the mother vehicle's BMS via a dual-head charging and discharging gun and then to the mother vehicle's vehicle controller via the CAN line.

[0074] Step S20: Calculate the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and compare the power difference with a preset power threshold.

[0075] It should be noted that the power difference between the parent vehicle power signal and the child vehicle power signal can be a positive value (i.e., the parent vehicle power signal is higher than the child vehicle power signal) or a negative value (i.e., the parent vehicle power signal is lower than the child vehicle power signal). The preset power threshold can be a pre-set power threshold for determining whether the parent vehicle power battery or the child vehicle power battery needs to be charged. When the absolute value of the power difference exceeds the preset power threshold (e.g., 5%), it is necessary to control the power battery with the higher power to supply power to the power battery with the lower power.

[0076] Step S30: Controlling the charge and discharge status of the power battery of the mother vehicle and the power battery of the child vehicle according to the comparison result of the power difference and the preset power threshold.

[0077] It should be noted that when the power difference is lower than a preset power threshold (e.g., 5%), the power battery of the mother vehicle and the power battery of the child vehicle can be controlled to supply power in parallel. Alternatively, when the power difference is higher than the preset power threshold (e.g., 5%), the power battery with a higher power level can be controlled to supply power to the power battery with a lower power level.

[0078] Furthermore, the step S10 includes:

[0079] Step S101: Determine whether the voltage platforms of the power battery of the mother vehicle and the power battery of the child vehicle are consistent.

[0080] It should be noted that the voltage platform of a power battery refers to the output voltage level of the power battery in new energy vehicles, and all parts and components of new energy vehicles are parameterized, designed, developed and verified under the corresponding voltage level. For example, there are voltage levels of 400V and 800V.

[0081] It should be understood that only when the voltage platforms of the mother vehicle power battery and the sub-vehicle power battery are consistent can mutual charging and discharging control be performed. For example, when both are 400V or both are 800V, the collection of the battery power signals of the mother and sub-vehicles and the control of the charging and discharging functions can be used normally. When the voltage platforms of the sub-vehicle and the mother vehicle are inconsistent, each vehicle uses its own power battery for power supply.

[0082] Step S102: If they are consistent, determine whether the dual-head charging and discharging gun is connected to the charging and discharging port.

[0083] It should be noted that if the voltage platforms of the mother vehicle's power battery and the child vehicle's power battery are determined to be consistent, the collection of the mother vehicle's battery power signal and the control of the charging and discharging functions can be used normally, and the dual-head charge and discharge gun can be inserted into the mother vehicle's charge and discharge port normally. After the dual-head charge and discharge gun is connected to the charge and discharge port, it can send a charging gun signal to the BMS. When the BMS receives the charging gun signal, it determines that the dual-head charge and discharge gun is connected.

[0084] Step S103: If inserted, obtain the mother vehicle power signal of the mother vehicle power battery and the sub-vehicle power signal of the sub-vehicle power battery.

[0085] It should be noted that after the power battery detects that the dual-head charging and discharging gun is connected to the charging and discharging port, the sub-vehicle power battery can transmit the sub-vehicle power signal to the mother vehicle power battery through the CAN line, and then transmit the sub-vehicle power signal and the mother vehicle power signal to the mother vehicle whole vehicle controller. Similarly, the mother vehicle power battery can transmit the mother vehicle power signal to the sub-vehicle power battery through the CAN line, and then transmit the sub-vehicle power signal and the mother vehicle power signal to the sub-vehicle whole vehicle controller.

[0086] In this embodiment, the power signal of the mother vehicle power battery and the power signal of the sub-vehicle power battery are obtained; the power difference between the mother vehicle power signal and the sub-vehicle power signal is calculated, and the power difference is compared with a preset power threshold; and the charge and discharge status of the mother vehicle power battery and the sub-vehicle power battery are controlled based on the comparison result of the power difference and the preset power threshold. By controlling the charge and discharge of the mother vehicle power battery and the sub-vehicle power battery according to the battery power, the mother vehicle can have a larger capacity battery pack and obtain a longer driving range, avoiding the time-consuming and labor-intensive search for charging stations along the way, shortening transportation time, and improving transportation efficiency.

[0087] Reference Figure 5 , Figure 5 This is a flow chart of the second embodiment of the power supply control method for the parent-child vehicle proposed by the present invention. Step S30 includes:

[0088] Step S501: When the power difference is higher than the preset power threshold, it is detected whether the power supply system of the parent vehicle is in a parking state.

[0089] It should be noted that when the difference between the power signal of the parent vehicle and the power signal of the child vehicle exceeds the preset power threshold, the charging and discharging functions need to be controlled according to the operating conditions of the vehicle. If the parent vehicle is in driving state at this time, the power battery should power the vehicle operation and will not charge the other power battery.

[0090] Step S502: If the vehicle is in a non-parking state, compare the power signal of the parent vehicle and the power signal of the child vehicle.

[0091] Step S503: According to the comparison result, a power battery with a higher power capacity is selected from the power battery of the mother vehicle and the power battery of the child vehicle for power supply.

[0092] It should be noted that when the mother vehicle is in a non-parked state, the power battery with higher power among the mother vehicle power battery and the sub-vehicle power battery is judged by the positive or negative value of the above-mentioned power difference, that is, when the power difference is positive, the mother vehicle power battery has higher power, and when the power difference is negative, the sub-vehicle power battery has higher power.

[0093] It should be understood that at this time, the mother vehicle uses a single power battery with a higher power capacity to drive and travel, meeting the driving and control needs of the entire vehicle and various electrical appliances.

[0094] Furthermore, after step S503, the method further includes:

[0095] Step S504: continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold.

[0096] It should be noted that as the power battery with a higher power level continues to supply power, the power level of the power battery will gradually decrease until the power difference between the parent and child vehicle power batteries falls below a preset power threshold. Therefore, it is necessary to collect the power difference between the parent and child vehicle power batteries in real time and compare it with the preset power threshold.

[0097] Step S505: When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

[0098] It should be noted that when the above-mentioned power battery with higher power continues to supply power so that the power difference with the power of another power battery is lower than the preset power threshold (for example, 5%), the battery parallel expansion mode is entered, and the power batteries of the mother and child vehicles are connected in parallel to power the mother vehicle to achieve the purpose of expanding the battery capacity.

[0099] Furthermore, after step S501, the following steps are further included:

[0100] Step S506: If the vehicle is in a parked state, compare the power signal of the parent vehicle and the power signal of the child vehicle.

[0101] Step S507: According to the comparison result, a power battery with a higher power level is selected from the power battery of the mother vehicle and the power battery of the child vehicle to charge the other power battery.

[0102] It should be noted that when the mother vehicle is in a parked state, the power battery with higher power among the mother vehicle power battery and the sub-vehicle power battery is judged by the positive or negative value of the above-mentioned power difference, that is, when the power difference is positive, the mother vehicle power battery has higher power, and when the power difference is negative, the sub-vehicle power battery has higher power.

[0103] It should be understood that at this time, a power battery with a higher power is selected to charge a power battery with a lower power so that the power of the parent vehicle is more balanced.

[0104] Furthermore, after step S507, the method further includes:

[0105] Step S508: continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold.

[0106] It should be noted that as the power battery with a higher charge continues to charge the power battery with a lower charge, the remaining charge of the power battery with a higher charge will gradually decrease until the charge difference between the parent and child power batteries falls below a preset charge threshold. Therefore, it is necessary to collect the charge difference between the parent and child power batteries in real time and compare it with the preset charge threshold.

[0107] Step S509: When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

[0108] It should be noted that when the power battery with higher power continues to supply power so that the power difference with the power of another power battery is lower than the preset power threshold (for example, 5%), the battery parallel expansion mode is entered to achieve the purpose of expanding the battery capacity.

[0109] In this embodiment, when the power difference is higher than the preset power threshold, the power supply system of the parent vehicle and the child vehicle is detected to be in a parked state. If the power difference is higher than the preset power threshold, the power signal of the parent vehicle and the child vehicle are compared. Based on the comparison result, the power battery with the higher power level is selected from the parent vehicle power battery and the child vehicle power battery for power supply. If the power difference is higher than the preset power threshold, the power signal of the parent vehicle and the child vehicle are compared. Based on the comparison result, the power battery with the higher power level is selected from the parent vehicle power battery and the child vehicle power battery for charging the other power battery. This allows charging while the vehicle is parked and electricity to be used while the vehicle is driving, avoiding the time-consuming and labor-intensive search for charging stations along the way, shortening transportation time, and improving transportation efficiency.

[0110] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0111] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power supply system for a mother-and-child vehicle, characterized in that: The power supply system of the mother and child vehicle includes: a double-head charging and discharging gun, a mother vehicle power battery, a child vehicle power battery, a mother vehicle whole vehicle controller and a child vehicle whole vehicle controller; One end of the double-headed charge and discharge gun is connected to the first end of the power battery of the mother vehicle through the charge and discharge port of the mother vehicle, and the other end of the double-headed charge and discharge gun is connected to the first end of the power battery of the sub-vehicle through the charge and discharge port of the sub-vehicle. The second end of the power battery of the mother vehicle is connected to the vehicle controller of the mother vehicle, and the second end of the power battery of the sub-vehicle is connected to the vehicle controller of the sub-vehicle; The double-head charging and discharging gun is used to transmit the charging gun signal to the vehicle controller of the sub-vehicle when it is inserted into the charging and discharging port of the mother vehicle and the charging and discharging port of the sub-vehicle; The sub-vehicle whole vehicle controller is used to collect the sub-vehicle power signal of the sub-vehicle power battery, and transmit the sub-vehicle power signal to the mother vehicle whole vehicle controller through the double-head charging and discharging gun when receiving the charging gun signal; The mother vehicle controller is used to collect the mother vehicle power battery's mother vehicle power signal, and control the mother vehicle power battery to the charge and discharge state of the sub-vehicle power battery according to the comparison result of the acquired sub-vehicle power signal and the mother vehicle power signal; The mother-child vehicle power supply system includes: a mother vehicle main positive relay, a mother vehicle main negative relay, a mother vehicle charging positive relay and a mother vehicle charging negative relay; The first end of the mother vehicle main positive relay is connected to the positive electrode of the mother vehicle power battery and the first end of the mother vehicle charging positive relay at the same time, the second end of the mother vehicle main positive relay is connected to the mother vehicle total positive power line, the second end of the mother vehicle charging positive relay is connected to the mother vehicle charging and discharging port, the first end of the mother vehicle negative positive relay is connected to the negative electrode of the mother vehicle power battery and the first end of the mother vehicle charging negative relay at the same time, the second end of the mother vehicle main negative relay is connected to the mother vehicle total negative power line, and the second end of the mother vehicle charging negative relay is connected to the mother vehicle charging and discharging port.

2. The power supply system for the parent-child vehicle according to claim 1, wherein: The parent-child vehicle power supply system further includes: a child vehicle main positive relay, a child vehicle main negative relay, a child vehicle charging positive relay, and a child vehicle charging negative relay; The first end of the sub-vehicle main positive relay is connected to the positive electrode of the sub-vehicle power battery and the first end of the sub-vehicle charging positive relay at the same time. The second end of the sub-vehicle main positive relay is connected to the sub-vehicle total positive power line. The second end of the sub-vehicle charging positive relay is connected to the sub-vehicle charging and discharging port. The first end of the sub-vehicle negative positive relay is connected to the negative electrode of the sub-vehicle power battery and the first end of the sub-vehicle charging negative relay at the same time. The second end of the sub-vehicle main negative relay is connected to the sub-vehicle total negative power line. The second end of the sub-vehicle charging negative relay is connected to the sub-vehicle charging and discharging port.

3. A method for controlling power supply of a parent-child vehicle, characterized in that: The parent-child vehicle power supply control method is applied to the parent-child vehicle power supply system according to any one of claims 1 to 2; the method comprises: Obtaining the power signal of the mother vehicle power battery and the power signal of the sub vehicle power battery; Calculating the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold; The charge and discharge states of the power battery of the mother vehicle and the power battery of the child vehicle are controlled according to the comparison result of the power difference and the preset power threshold.

4. The power supply control method for the parent-child vehicle according to claim 3, characterized in that: The step of controlling the charge and discharge states of the power battery of the parent vehicle and the power battery of the child vehicle according to the comparison result of the power difference and the preset power threshold comprises: When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the sub-vehicle are controlled to supply power in parallel.

5. The power supply control method for the parent-child vehicle according to claim 3, characterized in that: The step of controlling the charge and discharge states of the power battery of the parent vehicle and the power battery of the child vehicle according to the comparison result of the power difference and the preset power threshold comprises: When the power difference is higher than the preset power threshold, detecting whether the power supply system of the parent-child vehicle is in a parking state; If the vehicle is in a non-parking state, comparing the power signal of the mother vehicle with the power signal of the child vehicle; According to the comparison result, the power battery with higher power is selected from the power battery of the mother vehicle and the power battery of the sub-vehicle for power supply.

6. The method for controlling power supply of a parent-child vehicle according to claim 5, wherein: After the step of selecting the power battery with higher power from the power battery of the mother vehicle and the power battery of the child vehicle for power supply according to the comparison result, the method further includes: Continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold; When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

7. The method for controlling power supply of a parent-child vehicle according to claim 5, wherein: After the step of detecting whether the power supply system of the parent vehicle is in a parked state when the power difference is higher than the preset power threshold, the method further includes: If the vehicle is in a parked state, the power signal of the mother vehicle and the power signal of the child vehicle are compared; According to the comparison result, the power battery with higher power is selected from the power battery of the mother vehicle and the power battery of the child vehicle to charge the other power battery.

8. The power supply control method for the parent-child vehicle according to claim 7, characterized in that: After the step of selecting, based on the comparison result, the power battery with higher power from the power battery of the mother vehicle and the power battery of the child vehicle to charge the other power battery, the method further includes: Continuously obtaining the power difference between the power signal of the mother vehicle and the power signal of the child vehicle, and comparing the power difference with a preset power threshold; When the power difference is lower than the preset power threshold, the power battery of the mother vehicle and the power battery of the child vehicle are controlled to supply power in parallel.

9. The method for controlling power supply of a parent-child vehicle according to claim 3, wherein: The step of obtaining the power signal of the mother vehicle power battery and the power signal of the sub-vehicle power battery includes: Determine whether the voltage platforms of the power battery of the mother vehicle and the power battery of the child vehicle are consistent; If they are consistent, determine whether the dual-head charging and discharging gun is connected to the charging and discharging port; If inserted, the mother vehicle power signal of the mother vehicle power battery and the sub-vehicle power signal of the sub-vehicle power battery are obtained.

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