WO2024007829A1 - Control method and apparatus for dc/dc integrated high-voltage relay system - Google Patents

Abstract

The present application discloses a control method and apparatus for a DC/DC integrated high-voltage relay system. The method comprises: receiving a control instruction for controlling a target vehicle, wherein the control instruction comprises at least one of a high-voltage power-on instruction and a high-voltage power-off instruction; acquiring working condition information of a high-voltage relay system, wherein the working condition information comprises at least one of working state information of a reset switch and working state information of a DC/DC power supply; and generating a control strategy set on the basis of the control instruction and the working condition information, wherein the control strategy set comprises at least one of a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-checking strategy. The present application solves the technical problem of potential safety hazard of a whole vehicle due to failure of the whole vehicle caused by poor contact of a low-voltage electrical connection point.

Description

Control method and device for DC/DC integrated high-voltage relay system Technical field

The present application relates to the field of high-voltage relay systems, specifically, to a control method and device for a DC/DC integrated high-voltage relay system. This application requests priority for the patent application submitted to the China State Intellectual Property Office on July 6, 2022, with the application number 202210788532.0 and the invention title "Control method and device for DC/DC integrated high-voltage relay system".

Background technique

High-voltage relays in electric vehicles are important switching components in the high-voltage battery charge and discharge path to achieve start-up and shutdown control at the energy transfer level. If the contact of the high-voltage relay is abnormally disconnected due to software and hardware control reasons while the vehicle is driving, it will cause a safety hazard of the vehicle suddenly losing power. In addition, in the current industry, high-voltage relays are generally located in independent power distribution boxes within the battery pack, and their control The principle is basically hard-wired by the BMS according to the CAN requirements of the vehicle, and the power supply to the relay coil is taken from the 12V power supply of the vehicle. This design has the following potential failure factors: Due to the long vehicle 12V power line of the high-voltage relay and the many risk points for poor contact in the low-voltage harness connector, the low-voltage coil of the high-voltage relay cannot reliably close the contacts, causing the high-voltage contacts to open and close under load. phenomenon, eventually causing the high-voltage relay to stick. When repairing such faults, the battery pack needs to be disassembled and the entire power distribution box needs to be replaced, which is unfriendly to users and OEMs.

In response to the above problems, no effective solution has yet been proposed.

Contents of the invention

Embodiments of the present application provide a control method and device for a DC/DC integrated high-voltage relay system, so as to at least solve the problem of vehicle failure caused by poor contact of low-voltage electrical connection points and potential safety hazards in the vehicle.

According to one aspect of an embodiment of the present application, a control method for a DC/DC integrated high-voltage relay system is provided, including: receiving a control instruction for controlling a target vehicle, wherein the control instruction includes at least one of the following: high-voltage power-on command, high-voltage power-off command; collect the working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information, DC/DC power supply working status information; based on the control command and working condition information, generate A control strategy set, wherein the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test strategy.

Optionally, receive control instructions for controlling the target vehicle, collect working condition information of the high-voltage relay system, and generate a control strategy based on the control instructions and working condition information, including: receiving high-voltage power-on instructions; based on high-voltage power-on instructions Instruction to collect the working status information of the reset switch, wherein the working status information of the reset switch includes at least one of the following: the reset switch is in the disconnected state, the reset switch is in the connected state; when it is determined that the reset switch is in the connected state, collect the target monitoring point the first voltage; based on the first voltage of the target monitoring point, a high-voltage power-on strategy is generated.

Optionally, based on the first voltage of the target monitoring point, generate a high-voltage power-on strategy, including: based on the first voltage of the target monitoring point, determine whether the bus capacitance of the load system needs to be precharged; if not, generate a high-voltage power-on strategy strategy, in which the main relay controlling DC/DC is in a closed state during the high-voltage power-on strategy.

Optionally, the method also includes: when it is determined that the bus capacitance of the load system needs to be precharged, controlling the main relay of the DC/DC to be in an off state, and controlling the DC/DC to start the boost mode, so that the load system The voltage value at the capacitor terminal increases towards the output voltage value of the battery pack. Collect the second voltage of the target monitoring point. When it is determined that the second voltage meets the first preset condition, a high-voltage power-on strategy is generated, wherein during the high-voltage power-on strategy, the main relay controlling the DC/DC is in a closed state, and the DC/DC exits the boost mode.

Optionally, receive a control instruction for controlling the target vehicle, obtain working condition information of the high-voltage relay system, and generate a control strategy based on the control instruction and the working condition information, including: receiving a high-voltage power-off instruction. Based on the high-voltage power-off command, the DC/DC is controlled to stop the buck mode. Collect the voltage information of the battery. When it is determined that the voltage value of the battery is outside the power loss warning range, collect the current information between the DC/DC and the high-voltage load assembly. When it is determined that the current information satisfies the second preset condition, a high-voltage power-off strategy is generated, wherein during the high-voltage power-off strategy, the main relay controlling the DC/DC is in an off state.

Optionally, before generating the high-voltage power-down strategy, it also includes: when it is determined that the voltage value of the battery is within the power loss warning range, controlling the main relay of the DC/DC to be in a closed state, and controlling the DC/DC to start the voltage reduction mode.

Optionally, the method also includes: when it is determined that the voltage value of the battery is within the power loss warning range, generating battery fault information and reminder information, wherein the battery fault information is used to display the battery fault to the target object, and the reminder information is used to Show the target object that the battery of the target vehicle is in high-voltage replenishment mode. During the process of the battery being in high-voltage replenishment mode, the status information of the battery and the working status information of the reset switch are collected. When the status information of the battery and the working status information of the reset switch satisfy In the case of the third preset condition, and in the case where the current information satisfies the second preset condition, a high-voltage power-off strategy is generated.

Optionally, the method includes: collecting temperature information inside the DC/DC and collecting current information between the DC/DC and the high-voltage load assembly during the high-voltage power-on strategy of the high-voltage relay system. Based on the temperature information inside the DC/DC and the current information between the DC/DC and the high-voltage load assembly, a self-checking strategy for the high-voltage relay system is generated. slightly.

Optionally, generate a high-voltage relay system self-test strategy based on the temperature information inside the DC/DC and the current information between the DC/DC and the high-voltage load assembly, including: determining that the temperature information inside the DC/DC is higher than the first When the temperature value is preset, a cooling demand level command is sent to the cooling system, where the cooling demand level command is used to control the cooling system to turn on the cooling capacity corresponding to the demand level to perform cooling operations on the DC/DC. When it is determined that the current information between DC/DC and the high-voltage load assembly exceeds the normal operating current, reduce the load power demand of the high-voltage load assembly so that the current information between the DC/DC and the high-voltage load assembly does not exceed the normal operating current. In the case of working current, the self-test results of the high-voltage relay system self-test strategy are generated. The self-test results include DC/DC internal fault information, and the internal fault information is used to remind the target object that the target vehicle needs to be repaired.

According to another aspect of the embodiment of the present application, a control device for a DC/DC integrated high-voltage relay system is also provided, including: a receiving unit for receiving control instructions for controlling the target vehicle, wherein the control instructions include the following At least one of: high-voltage power-on command, high-voltage power-off command; the collection unit is used to collect the working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information, DC/DC power supply working Status information; a generating unit configured to generate a control strategy set based on the control instructions and working condition information, where the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test strategy.

According to another aspect of the embodiment of the present application, a processor is also provided, and the processor is configured to run a program, wherein when the program is run, the control method of the DC/DC integrated high-voltage relay system is executed.

According to another aspect of the embodiment of the present application, a vehicle is also provided, and the vehicle is controlled using the above control method of the DC/DC integrated high-voltage relay system.

In the embodiment of the present application, the control method of the DC/DC integrated high-voltage relay system can effectively reduce the vehicle failure rate, thereby improving the user experience. Moreover, the DC/DC integrated high-voltage relay system controlled by the control method can be used to effectively reduce the vehicle failure rate and thereby improve the user experience. /DC integrated high-voltage relay system can improve consumer safety.

Moreover, in the technical solution of this application, by utilizing the DC/DC stable low-voltage power supply output in parallel with the vehicle's 12V power supply as the relay low-voltage driving power supply, the purpose of reducing power supply hazards caused by poor contact at low-voltage electrical connection points is achieved, thereby achieving The technical effect is to improve the life of the battery pack in the car, thereby solving the technical problem of vehicle failure caused by poor contact of low-voltage electrical connection points, which makes the vehicle a safety hazard.

Description of the drawings

The accompanying drawings described here are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof are used to explain the present application and do not constitute undue limitations on the present application. In the attached picture:

Figure 1 is a schematic block diagram of the hardware structure of a computer terminal according to a control method for a DC/DC integrated high-voltage relay system of the present application;

Figure 2 is a flow chart of a control method for an optional DC/DC integrated high-voltage relay system according to an embodiment of the present application;

Figure 3 is a schematic structural diagram of a control device of an optional DC/DC integrated high-voltage relay system according to an embodiment of the present application;

Figure 4 is a schematic structural diagram of a control device for an optional DC/DC integrated high-voltage relay system according to an embodiment of the present application;

Figure 5 is a schematic diagram of a high-voltage relay monitoring method during vehicle power-on according to an embodiment of the present application;

Figure 6 is a schematic diagram of a high-voltage relay monitoring method during vehicle power-off according to an embodiment of the present application;

Figure 7 is a schematic diagram of a method for monitoring high-voltage relay abnormalities during vehicle driving according to an embodiment of the present application.

Explanation of reference numbers:
1. DC/DC converter; 2. Power battery assembly; 3. Drive module; 4. Power supply safety module; 5. Monitoring module; 6. High voltage relay; 7. High voltage relay; 8. Battery control module; 9. Integrated Vehicle control unit; 10. Cooling system; 11. Vehicle battery; 12. Relay power module output line; 13. Reset switch; 14. Signal line; 15. High-voltage load assembly; 16. Monitoring point; 17. Monitoring point; 18. Monitoring point; 19. Current sensor.

Detailed ways

In order to enable those in the technical field to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only These are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of this application.

It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "include" and "have" and their Any variations intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that incorporates a series of steps or units need not be limited to those steps or units expressly listed, but may include steps or units not expressly listed. or other steps or elements inherent to such processes, methods, products or devices.

According to the embodiments of the present application, a method embodiment of a control method and device for a DC/DC integrated high-voltage relay system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed on a computer, such as a set of computers. The instructions are executed in a computer system, and although a logical sequence is shown in the flowchart illustrations, in some cases the steps shown or described may be performed in a sequence different from that herein.

This method embodiment may be executed in an electronic device including a memory and a processor or a similar computing device in the vehicle. Taking the electronic device running on the vehicle as an example, as shown in FIG. 1 , the electronic device of the vehicle may include one or more processors 102 (the processor may include but is not limited to a central processing unit (CPU), a graphics processing unit (GPU) ), digital signal processing (DSP) chips, microprocessors (MCU), programmable logic devices (FPGA), neural network processors (NPU), tensor processors (TPU), artificial intelligence (AI) type processors, etc. processing device) and a memory 104 for storing data. Optionally, the above-mentioned electronic device of the automobile may also include a transmission device 106 for communication functions, an input and output device 108, and a display device 110. Persons of ordinary skill in the art can understand that the structure shown in FIG. 1 is only illustrative and does not limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may also include more or less components than the above structural description, or have a different configuration than the above structural description.

The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer programs corresponding to the information processing methods in the embodiments of the present application. The processor 102 executes various tasks by running the computer programs stored in the memory 104. Function application and data processing, that is, realizing the above information processing method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely relative to the processor 102, and these remote memories may be connected to the mobile terminal through a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.

The transmission device 106 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC for short), which can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used to communicate with the Internet wirelessly.

The display device 110 may be, for example, a touch screen type liquid crystal display (LCD) and a touch display (also known as "touch screen" or "touch display"). The liquid crystal display may enable a user to interact with the user interface of the mobile terminal. In some embodiments, the above-mentioned mobile terminal has a graphical user interface (GUI), and the user can perform human-computer interaction with the GUI through finger contact and/or gestures on the touch-sensitive surface. The human-computer interaction function here is optional. Including the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music and/or web browsing, etc., used to perform the above-mentioned tasks The executable instructions of the computer interactive function are configured/stored in a computer program product or readable storage medium executable by one or more processors.

Figure 2 is a control method for a DC/DC integrated high-voltage relay system according to an embodiment of the present application. As shown in Figure 2, the method includes the following steps:

Step S102: Receive a control instruction for controlling the target vehicle, where the control instruction includes at least one of the following: a high-voltage power-on instruction and a high-voltage power-off instruction.

Through the above steps, the start-up and shutdown control at the energy transfer level can be realized while the vehicle is driving.

Step S104: Collect working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information and DC/DC power supply working status information.

Through the above steps, it is possible to transmit new work instructions based on the working status and DC/DC power supply working status information while the car is driving.

Step S106: Generate a control strategy set based on the control instructions and working condition information, where the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test strategy.

Through the above steps, three strategies including high-voltage power-on strategy, high-voltage power-off strategy, and high-voltage relay system self-test strategy formed based on working conditions can be realized to ensure that the high-voltage relay drive module provides stable low-voltage power supply and can be used when the vehicle battery is depleted. Even if the low-voltage wiring harness of the entire vehicle has poor contact, the high-voltage relay drive module and high-voltage relay can still work reliably.

Among them, the control instructions for controlling the target vehicle are received, the working condition information of the high-voltage relay system is collected, and the control strategy is generated based on the control instructions and the working condition information, including: receiving high-voltage power-on instructions. Based on the high-voltage power-on command, the reset switch working status information is collected, where the reset switch working status information includes at least one of the following: the reset switch 13 is in the disconnected state, and the reset switch is in the connected state. When it is determined that the reset switch is in the connected state, the first voltage of the target monitoring point is collected; based on the first voltage of the target monitoring point, a high-voltage power-on strategy is generated. This setting is shown in Figure 5. According to the status of the entire vehicle, a high-voltage power-on request can be initiated and sent to the DC/DC converter 1 through the CAN line. Then, the DC/DC converter 1 determines the status of the reset switch 13. If the switch remains closed, it enters the high-voltage relay power-on control step.

As an optional embodiment, a high-voltage power-on strategy is generated based on the first voltage of the target monitoring point, Including: based on the first voltage of the target monitoring point, determine whether the bus capacitance of the load system needs to be precharged; if not, generate a high-voltage power-on strategy, in which the main relay of the DC/DC is controlled during the high-voltage power-on strategy. in a closed state.

Specifically, as shown in Figure 5, the DC/DC is connected to the monitoring points (16, 18) through hard wires, and the voltage values at each point are collected and compared with the battery output voltage, that is, the voltage on both sides of the contacts of high-voltage relay 6 and high-voltage relay 7 is determined. Whether the difference reaches the threshold for starting precharge, if it is necessary to start precharge, jump to step 11. If precharging is not required, jump directly to step 15. In this setting, the connection monitoring point 16 is the connection point between the monitoring module 5, the high-voltage relay 6 and the high-voltage load assembly 15. The monitoring point 17 is the connection point between the high-voltage relay 7 , the power battery assembly 2 and the monitoring module 5 . The monitoring point 18 is the connection point between the monitoring module 5, the high-voltage relay 7 and the high-voltage load assembly 15 or the charging device.

The method also includes: when it is determined that the bus capacitance of the load system needs to be precharged, controlling the main relay of the DC/DC to be in an off state, and controlling the DC/DC to start the boost mode so that the voltage at the capacitor end of the load system The value increases towards the output voltage value of the battery pack. Collect the second voltage of the target monitoring point. When it is determined that the second voltage meets the first preset condition, a high-voltage power-on strategy is generated, wherein during the high-voltage power-on strategy, the main relay controlling the DC/DC is in a closed state, and the DC/DC exits the boost mode.

Specifically, as shown in Figure 4, the main relay is in an off state in order to avoid damage to the relay by inrush current. The power safety module 4 converts the energy from the vehicle battery 11 into high voltage and transmits it to the high-voltage load assembly 15, precharges the bus capacitor of the load system, and gradually increases the load capacitor terminal voltage and approaches the output voltage value of the battery pack. When the first preset condition is met, the power supply safety module 4 stops high-voltage output and notifies the driving module 3 of the power output status. With this arrangement, the drive module 3 can directly engage the high-voltage relay according to the status of the power supply safety module 4, thereby avoiding relay adhesion problems caused by communication delays or false alarms. Preferably, the first preset condition is the preset voltage value of the monitoring point.

As an optional embodiment, receiving a control instruction for controlling the target vehicle, obtaining the working condition information of the high-voltage relay system, and generating a control strategy based on the control instruction and the working condition information includes: receiving a high-voltage power-off instruction; High-voltage power-off command controls DC/DC to stop the buck mode. Collect the voltage information of the battery. When it is determined that the voltage value of the battery is outside the power loss warning range, collect the current information between the DC/DC and the high-voltage load assembly. When it is determined that the current information satisfies the second preset condition, a high-voltage power-off strategy is generated, wherein during the high-voltage power-off strategy, the main relay controlling the DC/DC is in an off state.

As shown in Figure 6, during the power-off stage of the vehicle, first the vehicle control unit 9 initiates a high-voltage power-off request based on user intention and vehicle status judgment, and sends it to the DC/DC converter 1 through the CAN line. Then, the DC/ The DC power supply safety module 4 immediately stops outputting in the buck mode, that is, stops outputting 12V to the battery 11 and stops outputting 12V voltage to the drive module 3 . This setting can effectively improve the reliability and completeness of the control system.

Among them, before generating the high-voltage power-off strategy, it also includes: determining that the battery voltage value is within the power loss warning range. Within the situation, the main relay that controls the DC/DC is in a closed state, and the DC/DC is controlled to start the buck mode. This setting can further improve the reliability of the control method.

Wherein, the method also includes: when it is determined that the voltage value of the battery is within the power loss warning range, generating battery fault information and reminder information, wherein the battery fault information is used to display the battery fault to the target object, and the reminder information is used to show the battery fault to the target object. The target object shows that the battery of the target vehicle is in high-voltage recharge mode. During the process of the battery being in high-voltage recharge mode, the status information of the battery and the working status information of the reset switch are collected. When the status information of the battery and the working status information of the reset switch meet the requirements of the first In the case of three preset conditions, and in the case where the current information satisfies the second preset condition, a high-voltage power-off strategy is generated.

As shown in Figure 6, judge whether the voltage of the vehicle battery 11 is within the power loss warning range through its own 12V power input; if the battery loss warning is found, jump to S22; if the battery loss warning is not found, jump to S21 . The DC/DC collects the current transmitted between the DC/DC and the high-voltage load assembly 15 through its own internal current sensor 19. The purpose is to determine whether other loads in the vehicle have stopped working and avoid damaging the relay when the load is disconnected. The driving module 3 keeps the high-voltage relay 6 and the high-voltage relay 7 closed. DC/DC restarts the step-down output mode in order to recharge the 12V vehicle battery 11 to prevent the vehicle from being unable to start due to battery loss. At the same time, S24DC/DC reports a battery failure, reminding personnel that the vehicle is still in a high-voltage power-on state. During the process of recharging the battery, DC/DC monitors in real time whether the vehicle battery 11 is removed or whether the reset switch 13 is disconnected by personnel. If any of the above operations occurs, DC/DC immediately controls the power supply safety module 4 to stop working. , and jump to power-off process S21. Finally, the DC/DC driven high-voltage relay is disconnected, completing the relay power-off action.

As an optional embodiment, the method includes: collecting temperature information inside the DC/DC during the high-voltage power-on strategy of the high-voltage relay system, and collecting the current between the DC/DC and the high-voltage load assembly. Information, based on the temperature information inside the DC/DC and the current information between the DC/DC and the high-voltage load assembly, a self-test strategy for the high-voltage relay system is generated.

Specifically, as shown in Figure 7, during the vehicle driving stage, the DC/DC monitoring module 5 monitors the temperature of the electrical connection near the high-voltage relay contact in real time through the monitoring points (16, 17, 18). If the temperature of the electrical connection is higher than the relay temperature, If the temperature protection is limited, jump to S31, otherwise jump to S05.

In another embodiment of the present application, a high-voltage relay system self-test strategy is generated based on the temperature information inside the DC/DC and the current information between the DC/DC and the high-voltage load assembly, including: determining the internal temperature of the DC/DC When the temperature information is higher than the first preset temperature value, a cooling demand level instruction is sent to the cooling system, where the cooling demand level instruction is used to control the cooling system to turn on the cooling capacity corresponding to the demand level to perform cooling operations on the DC/DC. When it is determined that the current information between DC/DC and the high-voltage load assembly exceeds the normal operating current, reduce the load power demand of the high-voltage load assembly so that the current information between the DC/DC and the high-voltage load assembly does not exceed the normal operating current. In the case of working current, the self-test results of the high-voltage relay system self-test strategy are generated. The self-test results include DC/DC internal fault information, and the internal fault information is used to remind the target object that the target vehicle needs to be repaired.

Specifically, as shown in Figure 7, DC/DC reports cooling upgrade requirements to the cooling system 10 through the CAN line, requiring the vehicle to increase the flow rate of the cooling loop where DC/DC is located to the cooling level as agreed. The DC/DC monitors whether the transmission current between the DC/DC converter 1 and the vehicle's high-voltage load assembly or charging device is within the normal range through the current sensor 19, in order to confirm whether the current temperature rise is caused by the vehicle's operating conditions. The DC/DC monitors the temperature of the electrical connection near the high-voltage relay contact in real time through the monitoring points (16, 17, 18), with the purpose of monitoring whether the heating of the relay contact has improved under the conditions of cooling upgrade. If the relay contact temperature exceeds the limit temperature, it proves that the relay has signs of damage or there is a safety risk, and then jumps to S34. The DC/DC monitors whether the transmission current between the DC/DC converter 1 and the vehicle high-voltage load assembly or charging device is within the normal range through the current sensor 19, so as to determine whether the relay overtemperature is due to an abnormality in the external high-voltage load assembly and the current exceeds the limit. . If the load current is indeed too large, jump to S35, that is, report an early warning to the vehicle control unit 9 through the CAN line, and recommend that the vehicle reduce the power demand; if the load current is not found to be too large, jump to S36, that is, confirm the DC/DC If there is an over-temperature fault inside or in the relay itself, an early warning will be reported to the vehicle control unit 9 through the CAN line, and it is recommended that the vehicle be repaired as soon as possible. This setting utilizes the DC/DC internal monitoring function and the existing cooling water channel, and adjusts the DC/DC cooling flow through the control strategy to achieve early warning of relay failure and product specification reduction.

According to an embodiment of the present application, a control device for a DC/DC integrated high-voltage relay system is also provided. As shown in FIG. 3 , the control device includes a receiving unit 40 , a collection unit 42 , and a generating unit 44 . The receiving unit is configured to receive control instructions for controlling the target vehicle, where the control instructions include at least one of the following: a high-voltage power-on instruction and a high-voltage power-off instruction. The collection unit is used to collect working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information and DC/DC power supply working status information. The generation unit is used to generate a control strategy set based on the control instructions and working condition information, where the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test strategy.

As shown in Figure 4, the control device mainly includes: the core components are a pluggable high-voltage relay module, a DC/DC control module with the function of driving the high-voltage relay, a power module with the function of powering the high-voltage relay, and a high-voltage relay contact voltage The collected monitoring module, the thermal management module with high-voltage relay temperature collection, and the DC/DC assembly composed of the above modules integrated and arranged on the upper cover of the battery pack. System support components include the vehicle battery, reset switch, cooling system 10, vehicle control unit 9, high-voltage assembly or charging device, battery pack and its control module. The above is the main structure of the control system, which can be applied to all new energy vehicles containing DC/DC. Among them, DC/DC converter: Based on the existing DC/DC design, the relay drive module 3 in the original battery control unit is integrated, and a new relay power supply safety module 4 and monitoring module 5 are added, realizing a new relay The low-voltage power supply mechanism can control and adjust the power supply voltage of the relay during the relay closing period; a more comprehensive relay monitoring information channel has been established, which adds temperature detection to the previous voltage monitoring. At the same time, based on the principle of nearby layout, the DC/DC converter 1 also integrates a high-voltage relay and its high and low voltage electrical connections. In particular, the reliability of the relay drive signal is effectively improved by using PCB wiring. Power battery assembly 2: includes the battery module and battery control module 8, which can communicate with the DC/DC internal monitoring module 5 through CAN communication and report the battery Status information such as voltage, charge and discharge requirements, etc. Since there is continuous high voltage between the battery module and the high voltage relay, the power battery assembly 2 and the DC/DC converter 1 adopt an integrated design. For example, the DC/DC converter is integrated with the upper end plate of the battery, and the high and low voltage electrical connections are Direct connection solutions, etc., avoid personnel contact and ensure maintenance safety. High-voltage relay drive module 3: Integrated inside the DC/DC, it is used to drive the low-voltage coil of high-voltage relay 6 and high-voltage relay 7, so that the high-voltage contacts of the relay can be closed or opened as required. The input terminal of this module is a 12V power supply, which is connected to the high-voltage relay power supply safety module 4 and the vehicle battery 11 respectively. The output end is a level signal (>9V or open), which is connected to the low-voltage coil end of high-voltage relay 6 and high-voltage relay 7 through PCB. High-voltage relay power supply safety module 4: Integrated inside the DC/DC, it is used to provide stable low-voltage power for the high-voltage relay drive module 3, and can still maintain high voltage when the vehicle battery 11 is depleted and the vehicle low-voltage harness has poor contact. Relay drive module 3, high-voltage relay 6 and high-voltage relay 7 work reliably; during the vehicle power-up stage and before the power supply safety module 4 is started, the only source of power supply for high-voltage relay drive module 3 is the vehicle battery 11 passing through the low-voltage wiring harness; but the power supply After the safety module 4 is started, the only source of power supply for the high-voltage relay drive module 3 is the vehicle battery 11 through the low-voltage wiring harness. High-voltage relay monitoring module 5: integrated inside the DC/DC, used to collect the voltage and temperature of monitoring points 16, 17, and 18 on the high-voltage electrical connection, as well as the current reported by the current sensor 19 at the DC/DC high-voltage output end. value. This module can determine the action status of the relay contacts based on the voltage values reported by the monitoring points 16, 17, and 18 of the high-voltage relay contact accessories, and determine whether the relay contacts are faulty based on the reported temperature values, such as electrical damage caused by vibration. Abnormal connection and contact torque, excessive contact resistance leading to relay contact ablation, etc. This information helps DC/DC converter 1 make comprehensive judgments and report to the entire vehicle so that timely repairs can be made before the relay is damaged. High-voltage relay 6, high-voltage relay 7: integrated inside the DC/DC, but can be replaced through the maintenance port; the contact part of the module is connected to the high-voltage electrical connection inside the DC/DC through bolts, and is close to the DC/DC's own water cooling device, so that Reduce the ambient temperature; the low-voltage coil part is connected to the DC/DC internal PCB circuit board (such as plugging or welding) to obtain the drive control signal. During relay maintenance, the replacement operation can be carried out through the DC/DC maintenance port, which is more convenient than being arranged in the battery pack in the current industry. Reset switch 13 and signal line 14: The reset switch 13 should be arranged in a position that is relatively easy to operate (such as the front cabin or passenger cabin). When the switch is turned off, the signal is transmitted to the high-voltage relay drive module 3 through the signal line 14. It is prohibited to The output of the high-voltage relay power safety module 4 prohibits the drive of high-voltage relay 6 and high-voltage relay 7 from closing. In order to ensure the signal is stable and reliable, the signal line 14 adopts PCB wiring design. Monitoring point 16, monitoring point 17, monitoring point 18: integrated inside the DC/DC, arranged on the high-voltage electrical connection close to the high-voltage relay contacts, including voltage lead sampling points and thermistor sampling points. in,

A relay power module output line 12 is arranged inside the DC/DC, and the output line is used to electrically connect with other components inside the DC/DC to provide electrical energy.

According to an embodiment of the present application, a processor is also provided, and the processor is configured to run a program, wherein when the program is run, the control method of the DC/DC integrated high-voltage relay system is executed.

According to an embodiment of the present application, a vehicle is also provided, and the vehicle is controlled using a control method of a DC/DC integrated high-voltage relay system. This setting enables the existing DC/DC internal power supply module to be used under the driving conditions of the entire vehicle. The block serves as a low-voltage redundant power supply for high-voltage relays, effectively solving the hidden trouble of poor contact in the vehicle power supply harness. The signal of the DC/DC control relay is transmitted through the circuit board, which is more reliable than the previous low-voltage wiring harness in the battery pack. At the same time, during the high-voltage power-on stage of the vehicle, the DC/DC bidirectional conversion function is used to convert the 12V power supply of the vehicle into Class B voltage to realize pre-charging on the high-voltage load assembly side. The DC/DC hard wire directly detects the voltage before and after the relay contact. BMS communication through CAN is more direct than before, reducing the impact of control path delays on the voltage difference across the relay. Moreover, the current-carrying capacity of a high-voltage relay directly determines its cost. In this application, the high-voltage relay can utilize the existing DC/DC cooling water channel and adjust the DC/DC cooling flow rate through a control strategy to reduce the specifications of the relay product. In addition, the control system omits the precharge relay and precharge resistor.

In the above-mentioned embodiments of the present application, each embodiment is described with its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units may be a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or may be Integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the units or modules may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code. .

The above descriptions are only preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art As a researcher, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be regarded as the protection scope of this application.

Claims (12)

1. A control method for a DC/DC integrated high-voltage relay system, which is characterized by including:

   Receive a control instruction for controlling the target vehicle, wherein the control instruction includes at least one of the following: a high-voltage power-on instruction and a high-voltage power-off instruction;

   Collect working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information, DC/DC power supply working status information;

   Based on the control instruction and the working condition information, a control strategy set is generated, where the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test strategy.
2. The method according to claim 1, characterized in that: receiving a control instruction for controlling a target vehicle, collecting operating condition information of the high-voltage relay system, and generating a control strategy based on the control instruction and the operating condition information, include:

   Receive the high-voltage power-on command;

   Based on the high-voltage power-on instruction, the working status information of the reset switch is collected, wherein the working status information of the reset switch includes at least one of the following: the reset switch is in a disconnected state, and the reset switch is in a connected state;

   When it is determined that the reset switch is in the connection state, collect the first voltage of the target monitoring point;

   The high-voltage power-on strategy is generated based on the first voltage of the target monitoring point.
3. The method according to claim 2, characterized in that, based on the first voltage of the target monitoring point, generating the high-voltage power-on strategy includes:

   Based on the first voltage of the target monitoring point, determine whether the bus capacitance of the load system needs to be precharged;

   If not, generate the high-voltage power-on strategy, wherein during the high-voltage power-on strategy, the main relay controlling the DC/DC is in a closed state.
4. The method of claim 3, further comprising:

   When it is determined that the bus capacitance of the load system needs to be precharged, the main relay of the DC/DC is controlled to be in an off state, and the DC/DC is controlled to start the boost mode, so that the load system The voltage value at the capacitor terminal increases toward the output voltage value of the battery pack;

   Collect the second voltage of the target monitoring point;

   When it is determined that the second voltage meets the first preset condition, the high-voltage power-on strategy is generated, wherein during the high-voltage power-on strategy, the main relay controlling the DC/DC is in a closed state, The DC/DC exits boost mode.
5. The method according to claim 3, characterized in that: receiving a control instruction for controlling the target vehicle, obtaining the operating condition information of the high-voltage relay system, and generating a control strategy based on the control instruction and the operating condition information, include:

   Receive the high-voltage power-off command;

   Based on the high-voltage power-off command, control the DC/DC to stop the voltage reduction mode;

   Collect the voltage information of the battery, and when it is determined that the voltage value of the battery is outside the power loss warning range, collect the current information between the DC/DC and the high-voltage load assembly;

   When it is determined that the current information satisfies the second preset condition, the high-voltage power-off strategy is generated, wherein during the high-voltage power-off strategy, the main relay controlling the DC/DC is in an off state.
6. The method according to claim 5, characterized in that before generating the high-voltage power-off strategy, it further includes:

   When it is determined that the voltage value of the battery is within the power loss warning range, the main relay of the DC/DC is controlled to be in a closed state, and the DC/DC is controlled to start the voltage reduction mode.
7. The method of claim 6, further comprising:

   When it is determined that the voltage value of the battery is within the power loss warning range, battery fault information and reminder information are generated, wherein the battery fault information is used to display the battery fault to the target object, and the reminder information is used to notify the target object. The target object shows that the battery of the target vehicle is in the high-voltage power replenishment mode. When the battery is in the high-voltage power replenishment mode, the status information of the battery and the working status information of the reset switch are collected. When the status information of the battery and the working status information of the reset switch meet the third preset condition, and when the current information meets the second preset condition, the high-voltage power-off strategy is generated.
8. The method according to claim 2, characterized in that the method includes:

   During the process of the high-voltage power-on strategy of the high-voltage relay system, the temperature information inside the DC/DC is collected, and the current information between the DC/DC and the high-voltage load assembly is collected;

   The high-voltage relay system self-test strategy is generated based on the temperature information inside the DC/DC and the current information between the DC/DC and the high-voltage load assembly.
9. The method according to claim 8, characterized in that based on the temperature information inside the DC/DC and the The current information between the DC/DC and the high-voltage load assembly is used to generate the high-voltage relay system self-test strategy, including:

   When it is determined that the temperature information inside the DC/DC is higher than the first preset temperature value, a cooling demand level instruction is sent to the cooling system, where the cooling demand level instruction is used to control the cooling system to turn on the corresponding demand level of cooling capacity to perform cooling operations on DC/DC;

   When it is determined that the current information between the DC/DC and the high-voltage load assembly exceeds the normal operating current, reduce the load power demand of the high-voltage load assembly. When the DC/DC and the high-voltage load When the current information between assemblies does not exceed the normal operating current, the self-test results of the high-voltage relay system self-test strategy are generated, where the self-test results include the DC/DC internal fault information, and the The internal fault information is used to remind the target object that the target vehicle needs to be repaired.
10. A control device for a DC/DC integrated high-voltage relay system, characterized by:

    A receiving unit configured to receive control instructions for controlling the target vehicle, wherein the control instructions include at least one of the following: a high-voltage power-on instruction and a high-voltage power-off instruction;

    A collection unit, used to collect working condition information of the high-voltage relay system, where the working condition information includes at least one of the following: reset switch working status information, DC/DC power supply working status information;

    A generation unit configured to generate a control strategy set based on the control instruction and the working condition information, wherein the control strategy set includes at least one of the following: a high-voltage power-on strategy, a high-voltage power-off strategy, and a high-voltage relay system self-test. Strategy.
11. A processor, characterized in that the processor is used to run a program, wherein when the program is run, the control method of the DC/DC integrated high-voltage relay system according to any one of claims 1 to 9 is executed.
12. A vehicle, characterized in that the vehicle is controlled using the control method of the DC/DC integrated high-voltage relay system described in any one of claims 1 to 9.