Vehicle-mounted intelligent power management system based on CAN bus

Abstract

The application relates to a CAN bus-based intelligent vehicle-mounted power management system, which takes an intelligent vehicle-mounted power supply, an intelligent DC distribution box and an intelligent inverter as cores, and realizes monitoring and control of vehicle power supply state information by using CAN bus communication. The intelligent vehicle-mounted power supply is connected with the intelligent DC distribution box, the intelligent inverter and a battery pack through a CAN communication bus. Sensors of output interfaces of the intelligent DC distribution box and the intelligent inverter constitute various end nodes of a monitoring network, the intelligent vehicle-mounted power supply carries out fusion processing and storage on data collected by various nodes in the system, and the data are uniformly reported to power management software through an Ethernet interface. Sampling data of working states of all power output interfaces in the system can be displayed on a control terminal computer in real time. The system improves the operability and reliability of vehicle-mounted equipment power supply state monitoring and management, provides necessary power supply guarantee for vehicle-mounted equipment, and provides sufficient information resources for vehicle state monitoring, fault diagnosis and comprehensive guarantee.

Description

Technical Field

[0001] This invention relates to the field of power control technology, and in particular to an in-vehicle intelligent power management system suitable for automobiles using CAN bus technology. Background Technology

[0002] In recent years, with the continuous expansion of vehicle application fields, especially the widespread use of various special vehicles such as ambulances, fire trucks, police cars, engineering rescue vehicles, and military supervision vehicles, as well as the gradual improvement of vehicle functional requirements, there are more and more electrical devices in vehicles, and they have gradually evolved from single devices to multiple integrated devices. While improving functionality and ride comfort, this has also significantly increased the power consumption requirements, and placed higher demands on vehicle power management.

[0003] Traditional vehicle power distribution relies on relays, contactors, air switches, and fuses. Most of these are manually controlled switches, making it difficult to control specific output interfaces and obtain detailed operating status of the power system. Load management is particularly challenging. Therefore, designing an intelligent and efficient power management system has become a necessity for development. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the problems of insufficient intelligence and inconvenience in the management of traditional vehicle power management in the prior art, and to provide an on-board intelligent power management system based on CAN bus.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: an on-board intelligent power management system based on CAN bus, including an intelligent on-board management power supply, an intelligent DC distribution box, an intelligent inverter, and a battery box; the intelligent on-board power supply is connected to the intelligent DC distribution box, the intelligent inverter, and the battery box via a CAN communication bus; each output interface of the intelligent DC distribution box and the intelligent inverter is connected to the input interface of the powered equipment; the sensors of each output interface of the intelligent DC distribution box and the intelligent inverter constitute the end nodes of the monitoring network; the intelligent on-board power supply performs fusion processing and storage on the data collected by each node in the system, and reports it to the device management component via an Ethernet communication interface, displaying the sampled data of the working status of the powered equipment on the control terminal computer; the intelligent on-board power supply is used to provide the DC power required by the on-board equipment, manage the charging of the battery pack in the battery box, and communicate with the power management software on the control terminal computer via Ethernet; the intelligent DC distribution box is used to distribute power to the DC power supply equipment; the intelligent inverter is used to generate and distribute the AC power required by the equipment; and the battery box is used to provide uninterrupted DC power supply.

[0006] Furthermore, the intelligent vehicle power supply includes: an AC / DC module connected to an AC input interface for outputting DC power; a DC / DC charging module connected to the DC output interface of the AC / DC module and the DC input interface of the battery box for charging the battery pack; a linear regulator module connected to a DC input device for outputting stable DC power and charging the battery pack; an AC selection module containing a microcontroller and connected to a solid-state relay, DC contactor, AC soft start, AC / DC module, DC / DC module, and linear regulator module for sampling, control, and protection functions of the entire unit; a display module communicating with the AC selection module via CAN for displaying vehicle power input, output, fault status indication, and battery level indication; and an I / O expansion module communicating with the AC selection module via CAN for acquiring power distribution switch status, indicating power distribution output status, and reporting vehicle power status information to the device management component via an independent CAN bus.

[0007] Preferably, the AC input interface includes: a mains AC interface, an external generator interface, and a silicon rectifier generator interface.

[0008] Furthermore, the intelligent DC distribution box includes: an intelligent power distribution control module, which is connected to the intelligent vehicle power supply via a CAN2 bus, for monitoring the corresponding output voltage and current, and providing protection against output overvoltage, overcurrent, and overtemperature, and uploading sampling information and fault information to the intelligent power distribution control module via a CAN1 bus; and an intelligent power module, which is connected to the DC input interface via a reverse diode and communicates with the intelligent power module via a CAN1 bus, and communicates with the intelligent vehicle power supply via a CAN2 bus, for comprehensively processing and displaying the various modules inside the DC distribution box.

[0009] Furthermore, the intelligent inverter includes: a boost module, connected to the DC input interface and the inverter module, for converting the DC input into high-voltage DC, which is then converted into stable AC by the inverter module. After filtering and purification, the AC is output to AC-powered equipment; a DSP control module, which has a bidirectional communication connection with the boost module, for controlling the DC contactor, the boost module's on / off state, and the inverter module's on / off state, for sampling the DC input voltage, AC output voltage, AC output current, and overall temperature, and for processing the sampling results to perform corresponding protection functions; and a display module, which is connected to the DSP control module via CAN communication, for indicating the DC input, AC output, and fault status of the inverter power supply.

[0010] Furthermore, the boost module includes: a boost chopper circuit, which has an input terminal connected to a DC input filter and an output terminal connected to an inverter circuit. The boost chopper circuit consists of a charging circuit, a filter reactor, a chopper current transformer, a parallel diode group, a diode protection capacitor, an absorption circuit, a parallel MOSFET group, and a parallel capacitor group. One end of the charging circuit is connected to the first input terminal of the DC input interface, and the other end is connected to the filter reactor and the second input terminal of the DC input interface, respectively, for charging the boost chopper circuit. One end of the filter reactor is connected to the charging circuit, and the other end is connected to the chopper current transformer and the parallel diode group, respectively, for adjusting the through voltage. One end of the chopper current transformer is connected to the filter reactor, and the other end is connected to the absorption circuit and the parallel MOSFET group, respectively, for detecting the current flowing through the parallel MOSFET group. The magnitude of the current; one end of the parallel diode group is connected to the filter reactor, the chopper current transformer, and the diode protection capacitor respectively, and the other end is connected to the first output terminal to prevent reverse current; one end of the diode protection capacitor is connected to the parallel diode group and the other end is connected to the first output terminal to protect the parallel diode group and to buffer it when the parallel diode group is conducting and reverse cutoff, preventing voltage spikes from breaking down; the absorption circuit is connected in parallel with the parallel MOSFET group, one end is connected to the chopper current transformer and the other end is connected to the second output terminal to protect the parallel MOSFET group from breakdown when it is turned on and off; the parallel MOSFET group is connected in parallel with the absorption circuit, one end is connected to the chopper current transformer and the other end is connected to the second output terminal to control conduction and cutoff; one end of the parallel capacitor group is connected to the first output terminal and the other end is connected to the second output terminal for charging.

[0011] Furthermore, the charging circuit consists of an air switch connected in parallel with the first resistor and a supporting capacitor connected in series with both.

[0012] Preferably, the air switch is composed of a DC contactor and a first diode connected in parallel.

[0013] Preferably, the supporting capacitor consists of a first capacitor and a second capacitor connected in parallel.

[0014] Furthermore, the parallel diode group consists of two sets of diodes connected in parallel.

[0015] Furthermore, the absorption circuit consists of a capacitor and a diode connected in parallel.

[0016] Furthermore, the parallel MOSFET group consists of a first MOSFET and a second MOSFET connected in parallel.

[0017] Preferably, the gate G of the first MOSFET and the second MOSFET is connected to a resistor and a diode in series, and is connected to the source S through a resistor.

[0018] Furthermore, the parallel capacitor bank consists of two capacitors connected in parallel.

[0019] The beneficial effects of this invention are as follows: Using an intelligent vehicle power supply, an intelligent DC distribution box, and an intelligent inverter as its core, the invention achieves monitoring and control of vehicle power status information through CAN bus communication. The intelligent vehicle power supply is connected to the intelligent DC distribution box, intelligent inverter, and battery pack via a CAN communication bus. Sensors at each output interface of the intelligent DC distribution box and intelligent inverter constitute the end nodes of the monitoring network. The intelligent vehicle power supply integrates, processes, and stores the data collected from each node within the system, and reports it uniformly to the power management software via an Ethernet interface. The operating status sampling data of all power output interfaces within the system can be displayed in real time on the control terminal computer. This improves the ease of operation and reliability of vehicle equipment power status monitoring and management, providing not only the necessary power supply guarantee for vehicle equipment but also sufficient information resources for vehicle status monitoring, fault diagnosis, and comprehensive support. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of the vehicle-mounted intelligent power management system of the present invention;

[0022] Figure 2 This is a block diagram of the intelligent DC distribution box of the present invention;

[0023] Figure 3 This is a block diagram of the intelligent inverter principle of the present invention;

[0024] Figure 4 This is a diagram of the boost chopper circuit in the boost module of the intelligent inverter of this invention.

[0025] In the diagram: 100, charging circuit; 101, absorption circuit. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0027] This invention discloses an in-vehicle intelligent power management system based on a CAN bus, the overall system structure of which is as follows: Figure 1As shown, the system includes an intelligent vehicle-mounted power management unit, three intelligent DC distribution boxes, an intelligent inverter, and a battery box. It can convert the AC input, silicon rectifier generator input, and battery pack input in the battery box into the power output form required by the equipment.

[0028] The internal connections of the vehicle-mounted intelligent power management system based on the CAN bus are as follows: the intelligent vehicle power supply is connected to the intelligent DC distribution box, intelligent inverter, and battery box via the CAN communication bus; each output interface of the intelligent DC distribution box and intelligent inverter is connected to the input interface of the powered equipment; the sensors of each output interface of the intelligent DC distribution box and intelligent inverter constitute the end nodes of the monitoring network; the intelligent vehicle power supply performs fusion processing and storage on the data collected by each node in the system, and reports it to the device management component via the Ethernet communication interface, displaying the sampled data of the working status of the powered equipment on the control terminal computer.

[0029] The functions of each component within the CAN bus-based vehicle intelligent power management system are described below:

[0030] The intelligent vehicle power supply provides the DC24V power required by the vehicle equipment, manages the charging of the battery pack in the battery box, and communicates with the power management software on the control terminal computer via Ethernet.

[0031] The intelligent DC distribution box is used for power distribution of DC24V DC power supply equipment.

[0032] Intelligent inverters are used to generate and distribute the AC 220V power required by the equipment.

[0033] The battery box is used to provide uninterrupted DC power.

[0034] The CAN bus-based vehicle intelligent power management system has no fewer than three power input interfaces: AC input, rated at 220V / 50Hz, with an allowable range of 176V~264V and a frequency of 50Hz±3.5Hz; silicon rectifier generator input, rated at 28V, with an allowable range of 24.5V~31.5V; and battery pack input from the battery box, rated at 24V, with an allowable range of 21.0V~29.4V for lithium-ion battery packs.

[0035] The CAN bus-based vehicle intelligent power management system has no fewer than 50 DC 24V power output interfaces: When AC input is used, the output voltage is DC 25.5V ± 0.5V, with a source effect of no more than 2%, a load effect of no more than 3%, and an RMS output ripple of no more than 20mV; when the silicon rectifier generator or the battery pack in the battery box is used as input, the output voltage is no more than DC 25.2V ± 0.5V, and the RMS output ripple is no more than 20mV. When AC input is used, the vehicle power factor is no less than 0.93.

[0036] The intelligent vehicle power supply in the CAN bus-based intelligent vehicle power management system includes: AC / DC module, DC / DC charging module, linear voltage regulator module, AC selection module, display module, I / O expansion module, auxiliary power module, Ethernet converter, AC filter, circuit breaker, and electrical connector.

[0037] The intelligent vehicle power supply is powered by AC mains, an external generator, a silicon rectifier generator, and a lithium battery pack.

[0038] The connection relationships and functions between the various modules of the intelligent vehicle power supply are as follows: AC / DC module, connected to the AC input interface, for outputting DC 25.5V DC power; DC / DC charging module, connected to the DC output interface of the AC / DC module and the DC input interface of the battery box, for charging the battery pack; linear regulator module, connected to the DC input device, for outputting DC power not exceeding DC 25.2V and charging the battery pack; AC selection module, containing a microcontroller and connected to solid-state relays, DC contactors, AC soft start, AC / DC module, DC / DC module, and linear regulator module, for completing the sampling, control, and protection functions of the entire unit; display module, communicating with the AC selection module via CAN, for displaying vehicle power input, output, fault status indication, and battery level indication; I / O expansion module, communicating with the AC selection module via CAN, for acquiring the status of the power distribution switch, indicating the power distribution output status, and simultaneously reporting vehicle power status information to the device management component via an independent CAN bus.

[0039] The principle block diagram of the intelligent DC distribution box is as follows: Figure 2 As shown, the internal modules of the intelligent DC distribution box mainly include: an intelligent power distribution control module, an intelligent power module, electrical connectors, and reverse connection diodes. The intelligent DC distribution box distributes the input DC power to DC-consuming equipment through intelligent power modules of corresponding power levels. It receives power distribution control signals via a CAN bus, completing the control and status display functions of the DC equipment, and is equipped with short-circuit and overcurrent protection functions for the power distribution output.

[0040] The connection relationships and functions between the modules of the intelligent DC distribution box are as follows: The intelligent power distribution control module is connected to the intelligent vehicle power supply via the CAN2 bus. It is used to monitor the corresponding output voltage and current, and provide protection against output overvoltage, overcurrent, and overtemperature. It also uploads the sampling information and fault information to the intelligent power distribution control module via the CAN1 bus. The intelligent power module is connected to the DC input interface via a reverse diode and communicates with the intelligent power module via the CAN1 bus. It also communicates with the intelligent vehicle power supply via the CAN2 bus. It is used to comprehensively process and display the data of the various modules inside the DC distribution box.

[0041] The principle block diagram of the intelligent inverter is as follows: Figure 3 As shown, the main modules inside the intelligent inverter include: a boost module, a DSP control module, an inverter module, a display module, a DC contactor, AC / DC filters, and electrical connectors. The inverter power supply filters and purifies the input DC24V DC power, converts it into high-voltage DC power through an isolation boost component, and finally converts it into AC220V AC power through the inverter component for use by AC electrical equipment.

[0042] The connection relationships and functions between the modules of the intelligent inverter are as follows: The boost module connects to the DC input interface and the inverter module, converting the DC input into high-voltage DC. The high-voltage DC is then converted into stable AC by the inverter module. After filtering and purification, the AC is output to AC-powered equipment. The DSP control module communicates bidirectionally with the boost module, controlling the DC contactor, boost module on / off, and inverter module on / off. It samples the DC input voltage, AC output voltage, AC output current, and overall temperature, and processes the sampling results to perform corresponding protection functions. The display module communicates with the DSP control module via CAN, indicating the DC input, AC output, and fault status of the inverter power supply.

[0043] In this embodiment, the boost module in the intelligent inverter includes a boost chopper circuit. The boost chopper circuit has an input terminal connected to a DC input filter and an output terminal connected to the inverter circuit. The boost chopper circuit consists of a charging circuit 100, a filter reactor L1, a chopper current transformer U1, a parallel diode group, a diode protection capacitor C3, an absorption circuit 101, a parallel MOSFET group, and a parallel capacitor group. One end of the charging circuit 100 is connected to the first input terminal J1, which is the positive terminal of the 24V DC input interface, and the other end is connected to the 100μH / 20A filter reactor L1 and the second input terminal, which is the negative terminal of the 24V DC input interface. J2 is connected separately and used to charge the boost chopper circuit. The charging circuit 100 consists of an air switch connected in parallel with the first resistor R1 (100Ω / 40W) and a supporting capacitor connected in series with both. The air switch consists of a DC contactor KM1 (model 3TF300) and a first diode D1 (model 1N4007) connected in parallel. The supporting capacitor consists of a first capacitor C1 (10μF / 250V) and a second capacitor C2 (2.2mF / 200V) connected in parallel. After the air switch is closed, the DC contactor KM1 is opened, and the DC voltage charges the supporting capacitor through the first resistor R1. After charging is completed, the DC contactor KM1 is closed, and the inverter starts to work.

[0044] One end of the filter reactor L1 is connected to the charging circuit 100, and the other end is connected to the chopper current transformer U1 with a change ratio of 100 / 1A and a parallel diode group, respectively, to regulate the through voltage.

[0045] One end of the chopper current transformer U1 is connected to the filter reactor L1, and the other end is connected to the absorption circuit 101 and the parallel MOSFET group respectively, which is used to detect the magnitude of the current flowing through the parallel MOSFET group;

[0046] The parallel diode group consists of two sets of diodes connected in parallel. One set consists of two 60A / 300V second diodes D2 and D2' connected in parallel, and the other set consists of two 60A / 300V third diodes D3 and D3' connected in parallel. The two sets of diodes are connected in parallel. One end of the parallel diode group is connected to the filter reactor L1, the chopper current transformer U1, and the diode protection capacitor C3, respectively, and the other end is connected to the first output terminal P1 of the 140V DC power supply to prevent reverse current.

[0047] The diode protection capacitor C3 has parameters of 2*2.2nF. One end of it is connected to the parallel diode group, and the other end is connected to the first output terminal P1 of the 140V DC power supply. It is used to protect the parallel diode group and plays a buffering role when the parallel diode group is conducting and reverse cut off to prevent peak voltage breakdown.

[0048] The absorption circuit 101 consists of a capacitor C0 and a diode D0 connected in parallel. The parameter of C0 is 2*2.2Nf. The absorption circuit 101 is connected in parallel with the parallel MOSFET group. One end is connected to the chopper current transformer U1, and the other end is connected to the second output terminal P2 of 140V DC power. It is used to protect the parallel MOSFET group from being broken down when it is turned on and off.

[0049] The parallel MOSFET group consists of a first MOSFET M1 with parameters of 250V / 55A and a second MOSFET M2 with parameters of 250V / 55A connected in parallel. The parallel MOSFET group is connected in parallel with the snubber circuit 101. One end of the group is connected to the chopper current transformer U1, and the other end is connected to the second output terminal P2 of 140V DC, used to control the on and off states. The gate G of the first MOSFET M1 is connected in series with a fourth resistor R4 of 5Ω, a fifth resistor R5 of 10Ω, and a fourth diode D4, and is connected to its source S through a sixth resistor R6 of 1KΩ. The gate G of the second MOSFET M2 is connected in series with a seventh resistor R7 of 5Ω, an eighth resistor R8 of 10Ω, and a fifth diode D5, and is connected to its source S through a ninth resistor R9 of 1KΩ.

[0050] The parallel capacitor bank consists of three capacitors connected in parallel: a fourth capacitor C4 with a capacity of 10μF, a fifth capacitor C5 with a capacity of 10μF, and a sixth capacitor C6 with a capacity of 10μF. One end of the parallel capacitor bank is connected to the first output terminal P1 of the 140V DC power supply, and the other end is connected to the second output terminal P2 of the 140V DC power supply for charging.

[0051] This invention centers on an intelligent vehicle power supply, an intelligent DC distribution box, and an intelligent inverter, utilizing CAN bus communication to monitor and control vehicle power status information. The intelligent vehicle power supply is connected to the intelligent DC distribution box, intelligent inverter, and battery pack via a CAN communication bus. Sensors at each output interface of the intelligent DC distribution box and intelligent inverter constitute the end nodes of the monitoring network. The intelligent vehicle power supply fuses, processes, and stores the data collected from each node within the system, and reports it uniformly to the power management software via an Ethernet interface. The operating status sampling data of all power output interfaces within the system can be displayed in real-time on the control terminal computer. This improves the ease of operation and reliability of vehicle equipment power status monitoring and management, providing not only the necessary power supply guarantee for vehicle equipment but also ample information resources for vehicle status monitoring, fault diagnosis, and comprehensive support.

[0052] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vehicle-mounted intelligent power management system based on CAN bus, characterized in that: The system includes an intelligent vehicle-mounted power supply, an intelligent DC distribution box, an intelligent inverter, and a battery box. The intelligent vehicle-mounted power supply is connected to the intelligent DC distribution box, intelligent inverter, and battery box via a CAN communication bus. Each output interface of the intelligent DC distribution box and intelligent inverter is connected to the input interface of the powered equipment. Sensors at each output interface of the intelligent DC distribution box and intelligent inverter form the end nodes of a monitoring network. The intelligent vehicle-mounted power supply fuses, processes, and stores data collected from each node within the system, and reports this data via an Ethernet communication interface to the device management component, displaying the sampled operating status data of the powered equipment on the control terminal computer. The intelligent vehicle-mounted power supply provides the DC power required by the vehicle-mounted equipment, manages the charging of the battery pack in the battery box, and communicates with the power management software on the control terminal computer via Ethernet. The intelligent DC distribution box is used for power distribution to the DC-powered equipment. Intelligent inverters are used to generate and distribute the alternating current required by equipment; The battery box is used to provide uninterrupted DC power; among which, The intelligent inverter includes: a boost module, connected to the DC input interface and the inverter module, for converting the DC input into high-voltage DC, which is then converted into stable AC by the inverter module. The AC is filtered and purified before being output to AC-powered equipment; a DSP control module, which has a bidirectional communication connection with the boost module, for controlling the DC contactor, the boost module's on / off state, and the inverter module's on / off state, for sampling the DC input voltage, AC output voltage, AC output current, and overall temperature, and for processing the sampling results to perform corresponding protection functions; and a display module, which communicates with the DSP control module via CAN, for indicating the inverter power supply's DC input, AC output, and fault status. The boost module includes a boost chopper circuit, which has an input terminal connected to a DC input filter and an output terminal connected to an inverter circuit. The boost chopper circuit comprises a charging circuit, a filter reactor, a chopper current transformer, a parallel diode group, a diode protection capacitor, an absorption circuit, a parallel MOSFET group, and a parallel capacitor group. One end of the charging circuit is connected to the first input terminal of the DC input interface, and the other end is connected to the filter reactor and the second input terminal of the DC input interface, respectively, for charging the boost chopper circuit. One end of the filter reactor is connected to the charging circuit, and the other end is connected to the chopper current transformer and the parallel diode group, respectively, for adjusting the through voltage. One end of the chopper current transformer is connected to the filter reactor, and the other end is connected to the absorption circuit and the parallel MOSFET group, respectively, for detecting the current flowing through the parallel MOSFET group. The parallel diode group has one end connected to the filter reactor, chopper current transformer, and diode protection capacitor, respectively, and the other end connected to the first output terminal to prevent reverse current. The diode protection capacitor has one end connected to the parallel diode group and the other end connected to the first output terminal to protect the parallel diode group and act as a buffer when the parallel diode group is on and reverse-biased, preventing voltage spikes from causing breakdown. The absorption circuit is connected in parallel with the parallel MOSFET group, one end connected to the chopper current transformer and the other end connected to the second output terminal to protect the parallel MOSFET group from breakdown during on and off. The parallel MOSFET group is connected in parallel with the absorption circuit, one end connected to the chopper current transformer and the other end connected to the second output terminal to control on and off states. The parallel capacitor group has one end connected to the first output terminal and the other end connected to the second output terminal for charging. The charging circuit consists of an air switch connected in parallel with the first resistor and a supporting capacitor connected in series with both; the air switch consists of a DC contactor and a first diode connected in parallel; the supporting capacitor consists of a first capacitor and a second capacitor connected in parallel.

2. The vehicle-mounted intelligent power management system based on CAN bus as described in claim 1, characterized in that, The intelligent vehicle power supply includes: an AC / DC module connected to the AC input interface for outputting DC power; a DC / DC charging module connected to the DC output interface of the AC / DC module and the DC input interface of the battery box for charging the battery pack; a linear regulator module connected to the DC input device for outputting stable DC power and charging the battery pack; an AC selection module containing a microcontroller and connected to a solid-state relay, DC contactor, AC soft start, AC / DC module, DC / DC module and linear regulator module for sampling, control and protection functions of the entire unit; a display module communicating with the AC selection module via CAN for displaying vehicle power input, output, fault status indication and battery level indication; and an I / O expansion module communicating with the AC selection module via CAN for acquiring power distribution switch status, indicating power distribution output status, and reporting vehicle power status information to the device management component via an independent CAN bus.

3. The CAN bus-based intelligent vehicle power management system as described in claim 2, characterized in that, The AC input interfaces include: AC mains interface, external generator interface, and silicon rectifier generator interface.

4. The vehicle-mounted intelligent power management system based on CAN bus as described in claim 1, characterized in that, The intelligent DC distribution box includes: an intelligent power distribution control module, which is connected to the intelligent vehicle power supply via a CAN2 bus, for monitoring the corresponding output voltage and current, and providing protection against output overvoltage, overcurrent, and overtemperature, and uploading sampling information and fault information to the intelligent power distribution control module via a CAN1 bus; and an intelligent power module, which is connected to the DC input interface via a reverse diode and communicates with the intelligent power module via a CAN1 bus, and communicates with the intelligent vehicle power supply via a CAN2 bus, for comprehensively processing and displaying the various modules inside the DC distribution box.

5. The vehicle-mounted intelligent power management system based on CAN bus as described in claim 1, characterized in that, The parallel diode group consists of two sets of diodes connected in parallel.

6. The vehicle-mounted intelligent power management system based on CAN bus as described in claim 1, characterized in that, The absorption circuit consists of a capacitor and a diode connected in parallel.

7. The CAN bus-based intelligent vehicle power management system as described in claim 1, characterized in that, The parallel MOSFET group consists of a first MOSFET and a second MOSFET connected in parallel.

8. The CAN bus-based intelligent vehicle power management system as described in claim 7, characterized in that, The gates G of the first MOSFET and the second MOSFET are connected to a resistor and a diode in series, and are connected to the source S through a resistor.

9. The CAN bus-based intelligent power management system for vehicles as described in claim 1, characterized in that, The parallel capacitor bank consists of two capacitors connected in parallel.

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