TWI880253B - Vehicle body diagnostic system and method - Google Patents

Abstract

The present invention is a vehicle body diagnostic system and method thereof, which is mainly designed through a combination of a vehicle, at least one master station vehicle body controller, at least one device, at least one slave station vehicle body controller and at least one equipment, and the device is provided with at least one pin, the pin is used to output the current value of the device, and the current value of the device is detected by the detector of the slave station vehicle body controller, and the state of the device is judged according to the current value of the device, so that the vehicle body diagnostic system has the performance.

Description

Vehicle body diagnostic system and method thereof

The present invention relates to a vehicle body diagnostic system and method thereof, and in particular to a vehicle body diagnostic system that is applicable to various types of vehicles such as electric vehicles and electric buses.

Nowadays, vehicles in various countries, whether small or large, are developing towards electric vehicles, mainly to reduce the use of fuel (gasoline, diesel, etc.) to avoid increasing exhaust emissions, especially carbon emissions that have been valued in recent years.

All types of electric vehicles are beginning to use circuit boards for control, and circuit boards are composed of many electronic components. However, these electronic components (such as capacitors, resistors, chips, etc.) have a lifespan, and the usage status of each electronic component is different, which can easily affect the failure time of the electronic component, thereby causing abnormal signals on the circuit board or unstable circuit output.

Therefore, in view of the above shortcomings, the inventors of the present invention hope to propose a vehicle body diagnosis system and method with the function of vehicle body diagnosis, so that users can easily complete the operation and installation. They have devoted themselves to research and design to provide user convenience, which is the motivation for the invention of the present inventors.

The main purpose of the present invention is to provide a vehicle body diagnosis system and method thereof, which is mainly designed by combining a vehicle, at least one master station vehicle body controller, at least one device, at least one slave station vehicle body controller and at least one equipment, and the device is provided with at least one pin, the pin is used to output the current value of the device, and the current value of the device is detected by the detector of the slave station vehicle body controller, and the state of the device is judged according to the current value of the device, so that the system has the performance of vehicle body diagnosis, thereby increasing the overall practicality.

Another purpose of the present invention is to provide a vehicle body diagnostic system and method thereof, and transmit the current value and the status of the device to the master vehicle body controller through the second vehicle area network (CAN BUS), and then the master vehicle body controller transmits the status of the device to the display screen of the device through the first vehicle area network (CAN BUS) to display it, so as to have the effect of prompting the driver, and the master vehicle body controller transmits the current value of the device through the first vehicle area network (CAN BUS) to the storage device of the device for storage, so as to store relevant information as a reference for maintenance and repair, thereby increasing the overall usability.

Another purpose of the present invention is to provide a vehicle body diagnostic system and method thereof, wherein the current value of the device is provided with a trust interval, and the trust interval is a current value range set for the current value of the device to establish the credibility of the current value of the device, and to record the content of the current value of the device transmitted each time, wherein when the current value of the device falls within the trust interval, the device is normal, and when the current value of the device falls outside the trust interval, the device is abnormal, thereby being able to perform statistics on the current value of the device to determine the service life of the device, so as to have the performance of statistical service life, thereby increasing the overall operability.

In order to further understand the characteristics, features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the attached drawings are only for reference and description and are not used to limit the present invention.

10: Vehicles

11: The first automotive local area network (CAN BUS)

12: The first automotive local area network (CAN BUS)

20: Main station body controller

21: Microcontroller (MCU)

22: Key switch signal

23: Input signal

24: The first in-vehicle local area network (CAN BUS) signal

25: Second vehicle local area network (CAN BUS) signal

26: Wake-up signal from the slave vehicle body controller

30: Device

31: Pins

40: Slave body controller

41: Microcontroller (MCU)

42: Detector

50: Equipment

51: Display screen

52: Storage device

61: Warning light

62: Light

70: Trust interval

S100: Device output current value

S110: Determine the status of the device

S120: Transmitting master station body controller

S130: Device status display

S140: Device current value storage

Figure 1 is a schematic diagram of the vehicle body diagnostic system of the present invention.

Figure 2 is a schematic diagram of the vehicle body diagnostic structure of the present invention.

Figure 3 is a schematic diagram of the display screen of the device of the present invention.

Figure 4 is a schematic diagram of the trust interval operation of the present invention.

Figure 5 is a schematic diagram of the main steps of the present invention.

Please refer to Figures 1 to 5, which are schematic diagrams of embodiments of the present invention. The best implementation of the vehicle body diagnosis system and method of the present invention is to be used in various types of vehicles such as electric vehicles and electric buses, and have the performance of vehicle body diagnosis.

The vehicle body diagnostic system of the present invention is mainly designed through a combination of a vehicle 10, at least one master station vehicle body controller 20, at least one device 30, at least one slave station vehicle body controller 40 and at least one equipment 50 (as shown in Figure 1), wherein the vehicle 10 is a large vehicle or a small vehicle or other types of vehicles, and the drawings of the present invention are shown with large vehicles (such as buses, passenger vehicles, tour buses, etc.), but are not limited to the content and drawings of the present invention. The vehicle 10 is provided with a first CAN BUS 11 and a second CAN BUS 12, wherein the first CAN BUS 11 is mainly used for external serial connection, the so-called external refers to a device installed in the vehicle 10 to present the operation status of the vehicle 10, such as a dashboard, an electronic control display, etc., and the second CAN BUS 12 is mainly used for internal serial connection, the so-called internal refers to an electronic control device installed on the vehicle when the vehicle 10 is driving, such as a front door, a middle door, a low beam, a high beam, etc. In addition, the number of the first CAN BUS 11 and the second CAN BUS 12 is designed to match the vehicle 10, and can be one, two, or three, etc., but is not limited to the content and drawings of the present invention.

The master station vehicle body controller 20 is disposed on the vehicle 10, and the master station vehicle body controller 20 is connected to the first vehicle area network (CAN BUS) 11 and the second vehicle area network (CAN BUS) 12 of the vehicle 10, and the master station vehicle body controller 20 is provided with a microcontroller (MCU) 21, and the microcontroller (MCU) 21 of the master station vehicle body controller 20 receives at least one key switch (key) signal 22, at least one input signal 23, at least one first vehicle area network (CAN BUS) signal 24, at least one second vehicle area network (CAN BUS) signal 25, and at least one second vehicle area network (CAN BUS) signal 26. The master station body controller 20 receives at least one key switch signal 22 through the microcontroller (MCU) 21 to control the key switch signal 22, receives at least one input signal 23 through the microcontroller (MCU) 21 to control the input signal 23, receives and transmits at least one first CAN BUS signal 24 and at least one second CAN BUS signal 25 through the microcontroller (MCU) 21, and the microcontroller (MCU) 21 of the master station body controller 20 outputs at least one slave station body controller wake-up signal 26 to the slave station body controller 40 to wake up the slave station body controller 40.

The device 30 is provided on the vehicle 10. The device 30 is a small light, a low beam, a high beam, a daytime running light, a front fog light, a rear fog light, a front step light, a middle step light, a fluorescent light, a trunk light, a walkway light, a luggage compartment light, an advertising light box, a front door, a middle door, a safety door, a rear door, an air conditioning device, a stereo, a station announcement system, a tire pressure detector, Any of the following: rear mirror defogger, boarding and alighting ticket card equipment, front route machine, side route machine, rear route machine, route electromechanical facilities, broadcasting system, exit bell device, windshield blower device, front ventilator, rear ventilator, front TV or rear TV, or other electronic control devices installed on the vehicle 10, but not limited to the contents and drawings of the present invention. The device 30 is provided with at least one pin 31 (as shown in FIG. 1), wherein the pin 31 is an interface, which can be divided into a main power interface, an input/output interface, a control interface, a reset interface, etc. The pin 31 of the device 30 of the present invention outputs the current value of the device 30, and the current value is mainly the current value flowing when the device 30 is started or running, and the unit is ampere (A), microampere (uA), milliampere (mA), etc., and the use of the device 30 can be understood through the current value of the device 30.

In addition, the device 50 is installed on the vehicle 10, and the device 50 is connected to the first vehicle local area network (CAN BUS) 11, and the device 50 is provided with a display screen 51 and a storage device 52 (as shown in Figure 1), wherein the device 50 is a smart cabin central control host, and the smart cabin central control host has a high-performance central processor, which can simultaneously process various signals from the vehicle body, and can integrate image and sound information after integrated calculation, and supports Daisy Chain image output, with a maximum output of 4K resolution, and supports A2B serial sound topology, and can connect up to 12 external nodes. The display screen 51 of the device 50 is any one of an instrument screen, an electronic control screen, and a visual auxiliary screen, and the instrument screen receives the Daisy Chain image signal of the smart cockpit central control host, and can present the information of the smart cockpit central control host in a full-screen projection manner through the instrument screen. In addition, the electronic control screen receives the Daisy Chain image signal of the smart cockpit central control host, and can present the information of the smart cockpit central control host in a full-screen projection manner through the electronic control screen, and the electronic control screen is the control platform of the various components of the vehicle body, so that the driver can understand the status of the various components of the vehicle body. In addition, the visual auxiliary screen is provided on each side of the front window in the vehicle to receive the image signal transmitted by the smart cockpit central control host from the left and right side external cameras of the vehicle body, and provide the driver with a complete visual display of the vehicle outside the vehicle body. Furthermore, the storage device 52 of the device 50 is any one of a memory, a hard disk, and a server to store all signals of the vehicle 10 as a reference for maintenance and repair, and the device 50 is provided with any one of a speaker and a buzzer to display the sound.

In addition, the slave body controller 40 is arranged on the vehicle 10, and the slave body controller 40 is connected to the second vehicle area network (CAN BUS) 12 of the vehicle 10, and the slave body controller 40 is connected to the master body controller 20. The master body controller 20 of the present invention is simultaneously connected in series to at least two or more slave body controllers 40, wherein the number of series connections is designed in conjunction with the vehicle 10, but is not limited to the content and drawings of the present invention. The slave body controller 40 is provided with a microcontroller (MCU) 41 (as shown in FIG. 2 ), and the microcontroller (MCU) 41 receives at least one second CAN BUS signal 25 and at least one slave body controller wake-up signal 26, and receives and transmits at least one second CAN BUS signal 25 through the microcontroller (MCU) 41, and receives at least one slave body controller wake-up signal 26 transmitted by the microcontroller (MCU) 21 of the master body controller 20 to wake up the slave body controller 40.

Furthermore, the slave station vehicle body controller 40 is provided with at least one detector 42, wherein the detector 42 is connected to the pin (PIN) 31 of the device 30 (as shown in FIG. 3 and FIG. 4), and the current value of the device 30 is detected by the detector 42, and the state of the device 30 is determined according to the current value of the device 30, wherein the state of the device 30 is any one of a circuit state and an open circuit state. When the state of the device 30 appears to be an open circuit state, that is, when the current value of the device 30 is lower than the set value or the current value is 0, the set The device 50 displays a warning light 61, a warning signal, a warning message, and a warning sound through the display screen 51 (as shown in FIG. 3 ). For example, the warning light 61 is red, etc., to remind the driver that the device 30 may be faulty or abnormal. When the state of the device 30 appears to be a connection state, that is, when the current value of the device 30 meets its set value, the display screen 51 of the device 50 displays a light 62, a signal, a message, and a sound (as shown in FIG. 3 ), such as the light 62 is green, etc. In addition, the current value of the device 30 is provided with a trust interval 70 (as shown in FIG. 4 ), and the trust interval 70 is a current value range set for the current value of the device 30 to establish the credibility of the current value of the device 30 and record the content of the current value of the device 30 transmitted each time. When the current value of the device 30 falls within the trust interval 70, the device 30 is normal, and when the current value of the device 30 falls outside the trust interval 70, the device 30 is abnormal. In this way, the current value of the device 30 can be statistically calculated to determine the service life of the device 30, so that it has the function of statistical service life.

In addition, the slave body controller 40 is connected to the second vehicle area network (CAN BUS) 12 of the vehicle 10 to transmit the current value of the device 30 and the state of the device 30 to the master body controller 20 through the second vehicle area network (CAN BUS) 12, and then the master body controller 20 transmits the state of the device 30 through the first vehicle area network (CAN BUS) 11 to the display screen 51 of the equipment 50 for display (as shown in FIG. 3), so as to have the effect of prompting the driver, and the master body controller 20 transmits the current value of the device 30 through the first vehicle area network (CAN BUS) 11 to the display screen 51 of the equipment 50 for display (as shown in FIG. 3), so as to have the effect of prompting the driver, and the master body controller 20 transmits the current value of the device 30 through the first vehicle area network (CAN BUS) BUS) 11 is transmitted to the storage device 52 of the equipment 50 for storage (as shown in Figure 4), so that the relevant information can be stored as a reference for maintenance and repair.

The vehicle body diagnosis method of the present invention mainly adopts a combination design of a vehicle 10, at least one master vehicle body controller 20, at least one device 30, at least one slave vehicle body controller 40 and at least one equipment 50 (as shown in FIG. 1 ), wherein the vehicle 10 is a large vehicle or a small vehicle or other types of vehicles, and the diagram of the present invention is shown with a large vehicle (such as a bus, a passenger car, a tour bus, etc.), but is not limited to the content and diagram of the present invention. The vehicle 10 is provided with a first CAN BUS 11 and a second CAN BUS 12, wherein the first CAN BUS 11 is mainly used for external serial connection, the so-called external refers to a device installed in the vehicle 10 to present the operation status of the vehicle 10, such as a dashboard, an electronic control display, etc., and the second CAN BUS 12 is mainly used for internal serial connection, the so-called internal refers to an electronic control device installed on the vehicle 10 when the vehicle 10 is driving, such as a front door, a middle door, a low beam, a high beam, etc. In addition, the number of the first CAN BUS 11 and the second CAN BUS 12 is designed to match the vehicle 10, and can be one, two, or three, etc., but is not limited to the content and drawings of the present invention.

The master station vehicle body controller 20 is disposed on the vehicle 10, and the master station vehicle body controller 20 is connected to the first vehicle area network (CAN BUS) 11 and the second vehicle area network (CAN BUS) 12 of the vehicle 10, and the master station vehicle body controller 20 is provided with a microcontroller (MCU) 21. The microcontroller (MCU) 21 of the master station vehicle body controller 20 receives at least one key switch signal 22, at least one input signal 23, at least one first vehicle area network (CAN BUS) signal 24, at least one second vehicle area network (CAN BUS) signal 25, and at least one second vehicle area network (CAN BUS) signal 26. The master station body controller 20 receives at least one key switch signal 22 through the microcontroller (MCU) 21 to control the key switch signal 22, receives at least one input signal 23 through the microcontroller (MCU) 21 to control the input signal 23, receives and transmits at least one first CAN BUS signal 24 and at least one second CAN BUS signal 25 through the microcontroller (MCU) 21, and the microcontroller (MCU) 21 of the master station body controller 20 outputs at least one slave station body controller wake-up signal 26 to the slave station body controller 40 to wake up the slave station body controller 40.

In addition, the slave body controller 40 is arranged on the vehicle 10, and the slave body controller 40 is connected to the second vehicle area network (CAN BUS) 12 of the vehicle 10, and the slave body controller 40 is connected to the master body controller 20. The master body controller 20 of the present invention is simultaneously connected in series to at least two or more slave body controllers 40, wherein the number of series connections is designed in conjunction with the vehicle 10, but is not limited to the content and drawings of the present invention. The slave body controller 40 is provided with a microcontroller (MCU) 41 (as shown in FIG. 2 ), and the microcontroller (MCU) 41 receives at least one second CAN BUS signal 25 and at least one slave body controller wake-up signal 26, and receives and transmits at least one second CAN BUS signal 25 through the microcontroller (MCU) 41, and receives at least one slave body controller wake-up signal 26 transmitted by the microcontroller (MCU) 21 of the master body controller 20 to wake up the slave body controller 40.

The vehicle body diagnosis method of the present invention first performs step S100 (as shown in FIG. 5 ) of outputting the current value of the device: the device 30 is provided with at least one pin 31, and the pin 31 outputs the current value of the device 30. After completing the above step S100, the next step S110 is performed.

The device 30 is installed on the vehicle 10. The device 30 is the small light, low beam, high beam, daytime running light, front fog light, rear fog light, front step light, middle step light, fluorescent light, trunk light, aisle light, luggage compartment light, advertising light box, front door, middle door, safety door, rear door, air conditioning equipment, audio, station announcement system, tire pressure detection system of the vehicle 10. Any one of a device, a rear mirror defogger, a boarding and alighting ticket card device, a front route machine, a side route machine, a rear route machine, route electromechanical facilities, a broadcasting system, a get-off bell device, a front windshield blower, a front exhaust fan, a rear exhaust fan, a front television or a rear television, or other electronically controlled devices installed on the vehicle 10, but are not limited to the contents and drawings of the present invention. The device 30 is provided with at least one pin 31 (as shown in FIG. 1), wherein the pin 31 is an interface, which can be divided into a main power interface, an input/output interface, a control interface, a reset interface, etc. The pin 31 of the device 30 of the present invention outputs the current value of the device 30, and the current value is mainly the current value flowing when the device 30 is started or running, and the unit is ampere (A), microampere (uA), milliampere (mA), etc., and the use of the device 30 can be understood through the current value of the device 30.

In addition, the next step S110 is to determine the state of the device: the detector 42 of the slave body controller 40 is connected to the pin 31 of the device 30, and the current value of the device 30 is detected by the detector 42, and the state of the device 30 is determined according to the current value of the device 30. After completing the above step S110, the next step S120 is performed.

The slave vehicle body controller 40 is provided with at least one detector 42, wherein the detector 42 is connected to the pin 31 of the device 30 (as shown in FIG. 3 and FIG. 4), and the current value of the device 30 is detected by the detector 42, and the state of the device 30 is determined according to the current value of the device 30, wherein the state of the device 30 is either a circuit state or an open circuit state. When the state of the device 30 is an open circuit state, that is, when the current value of the device 30 is lower than the set value or the current value is 0, the The device 50 displays a warning light 61, a warning signal, a warning message, and a warning sound through the display screen 51 (as shown in FIG. 3). For example, the warning light 61 is red, etc., to remind the driver that the device 30 may be faulty or abnormal. When the status of the device 30 appears to be a connection status, that is, when the current value of the device 30 meets its set value, the display screen 51 of the device 50 displays a light 62, a signal, a message, and a sound (as shown in FIG. 3). For example, the light 62 is green, etc.

In addition, the next step S120 is transmitted to the master station body controller: the current value of the device 30 and the state of the device 30 are transmitted to the master station body controller 20 through the second vehicle local area network (CAN BUS) 12. After completing the above step S120, the next step S130 is performed.

The current value of the device 30 is provided with a trust interval 70 (as shown in FIG. 4 ), and the trust interval 70 is a current value range set for the current value of the device 30 to establish the credibility of the current value of the device 30 and record the content of the current value of the device 30 transmitted each time, wherein when the current value of the device 30 falls within the trust interval 70, the device 30 is normal, and when the current value of the device 30 falls outside the trust interval 70, the device 30 is abnormal, thereby, the current value of the device 30 can be statistically calculated to determine the service life of the device 30, so that it has the function of statistically calculating the service life. The slave body controller 40 is connected to the second vehicle area network (CAN BUS) 12 of the vehicle 10 to transmit the current value of the device 30 and the status of the device 30 to the master body controller 20 through the second vehicle area network (CAN BUS) 12.

In addition, the next step S130 is to display the status of the device: the main station body controller 20 transmits the status of the device 30 to the display screen 51 of the equipment 50 through the first vehicle local area network (CAN BUS) 11. After completing the above step S130, the next step S140 is performed.

After the status of the device 30 is transmitted to the master vehicle body controller 20 via the second vehicle area network (CAN BUS) 12, the master vehicle body controller 20 transmits the status of the device 30 via the first vehicle area network (CAN BUS) 11 to the display screen 51 of the equipment 50 for display (as shown in FIG. 3 ), so as to have the effect of prompting the driver. The device 50 is installed on the vehicle 10, and is provided with a display screen 51 and a storage device 52. The device 50 is connected to the first vehicle local area network (CAN BUS) 11 (as shown in Figure 1), and the device 50 is a smart cabin central control host. The smart cabin central control host has a high-performance central processor that can simultaneously process various signals from the vehicle body, and can integrate image and sound information after integrated calculation, and supports Daisy Chain image output, with a maximum output resolution of 4K, and supports A2B serial sound topology, and can connect up to 12 external nodes. The display screen 51 of the device 50 is any one of an instrument screen, an electronic control screen, and a visual auxiliary screen, and the instrument screen receives the Daisy Chain image signal of the smart cockpit central control host, and can present the information of the smart cockpit central control host in a full-screen projection manner through the instrument screen. In addition, the electronic control screen receives the Daisy Chain image signal of the smart cockpit central control host, and can present the information of the smart cockpit central control host in a full-screen projection manner through the electronic control screen, and the electronic control screen is the control platform of the various components of the vehicle body, so that the driver can understand the status of the various components of the vehicle body. In addition, the visual auxiliary screen is installed on each side of the front window in the car to receive the image signal from the left and right side external cameras transmitted by the smart cockpit central control host, and provide the driver with a complete visual display of the vehicle outside the body.

In addition, the next step S140 is to store the current value of the device: the master station vehicle body controller 20 transmits the current value of the device 30 to the storage device 52 of the equipment 50 through the first vehicle local area network (CAN BUS) 11 for storage.

After the current value of the device 30 is transmitted to the master body controller 20 via the second vehicle area network (CAN BUS) 12, the master body controller 20 transmits the current value of the device 30 to the storage device 52 of the equipment 50 via the first vehicle area network (CAN BUS) 11 for storage (as shown in Figure 4), so that relevant information can be stored as a reference for maintenance and repair. The storage device 52 of the equipment 50 is any one of a memory, a hard disk, and a server to store all signals of the vehicle 10 as a reference for maintenance and repair, and the equipment 50 is provided with any one of a speaker and a buzzer to display sound.

The above detailed description will enable those familiar with this technology to understand that this invention can indeed achieve the above-mentioned purpose and is in compliance with the provisions of the Patent Law, and therefore an invention patent application is filed.

However, the above is only a preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention; therefore, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope of the present invention patent.

10: Vehicles

11: The first automotive local area network (CAN BUS)

12: Second vehicle local area network (CAN BUS)

20: Main station body controller

26: Wake-up signal from the slave vehicle body controller

30: Device

31: Pins

40: Slave body controller

42: Detector

50: Equipment

51: Display screen

52: Storage device

Claims (26)

A vehicle body diagnostic system includes: A vehicle, the vehicle is provided with a first vehicle area network (CAN BUS) and a second vehicle area network (CAN BUS); At least one master station vehicle body controller, the master station vehicle body controller is arranged on the vehicle, and the master station vehicle body controller is connected to the first vehicle area network (CAN BUS) and the second vehicle area network (CAN BUS) of the vehicle respectively; At least one device, the device is installed on the vehicle, the device is provided with at least one pin, the pin is used to output the current value of the device; At least one slave body controller, which is arranged on the vehicle, connected to the second vehicle area network (CAN BUS) of the vehicle, and provided with at least one detector, which is connected to the pin of the device, and detects the current value of the device through the detector, and judges the state of the device according to the current value of the device, and then transmits the current value of the device and the state of the device to the master body controller through the second vehicle area network (CAN BUS); and At least one device is installed on the vehicle, connected to the first vehicle area network (CAN BUS), provided with a display screen and a storage device, the master station vehicle body controller transmits the state of the device to the display screen of the device through the first vehicle area network (CAN BUS) for display, and the master station vehicle body controller transmits the current value of the device to the storage device of the device through the first vehicle area network (CAN BUS) for storage. As described in Item 1 of the patent application scope, the state of the device is further any one of a circuit state and an open circuit state. As described in Item 2 of the patent application scope, when the device is in an open circuit state, the display screen of the device displays any one of a warning light, a warning signal, a warning message, and a warning sound. As described in Item 2 of the patent application scope, when the status of the device is a passage status, the display screen of the device displays any one of a light, a signal, a message, and a sound. As described in item 1 of the patent application scope, the vehicle body diagnostic system, wherein the current value of the device is further provided with a trust interval, and the trust interval is a current value range set for the current value of the device to establish the credibility of the current value of the device. As described in Item 5 of the patent application scope, the vehicle body diagnostic system, wherein when the current value of the device further falls within the trust interval, the device is normal. As described in Item 5 of the patent application scope, the vehicle body diagnostic system, wherein when the current value of the device further falls outside the trust interval, the device is abnormal. As described in Item 1 of the patent application scope, the vehicle body diagnostic system, wherein the device is further a smart cabin central control host. As described in Item 1 of the patent application scope, the vehicle body diagnostic system, wherein the device is further provided with any one of a speaker and a buzzer. As described in Item 1 of the patent application scope, the storage device of the device is further any one of a memory, a hard disk, and a server. As described in item 1 of the patent application scope, the vehicle body diagnostic system, wherein the main station vehicle body controller is further provided with a microcontroller (MCU). As described in item 1 of the patent application scope, the vehicle body diagnostic system, wherein the slave vehicle body controller is further provided with a microcontroller (MCU). A vehicle body diagnostic system as described in item 1 of the patent application, wherein the device is further a small light, a low beam, a high beam, a daytime running light, a front fog light, a rear fog light, a front step light, a middle step light, a fluorescent light, a trunk light, a walkway light, a luggage compartment light, an advertising light box, a front door, a middle door, a safety door, a rear compartment of the vehicle Doors, air conditioning equipment, audio, station announcement system, tire pressure detector, rear mirror defogger, boarding and alighting equipment, front route machine, side route machine, rear route machine, route electromechanical facilities, broadcasting system, exit bell device, windshield blower, front exhaust fan, rear exhaust fan, front TV or rear TV. A vehicle body diagnosis method includes a vehicle, at least one master vehicle body controller, at least one device, at least one slave vehicle body controller and an equipment, wherein the vehicle is provided with a first vehicle area network (CAN BUS) and a second vehicle area network (CAN BUS), the master vehicle body controller is provided on the vehicle, the master vehicle body controller is connected to the first vehicle area network (CAN BUS) and the second vehicle area network (CAN BUS) of the vehicle respectively, the device is provided on the vehicle, the slave vehicle body controller is provided on the vehicle, the slave vehicle body controller is provided with at least one detector, the slave vehicle body controller is connected to the second vehicle area network (CAN BUS) of the vehicle BUS), the device is installed on the vehicle, the device is provided with a display screen and a storage device, the device is connected to the first vehicle area network (CAN BUS), and the main steps of the diagnostic method include: Device output current value: The device is provided with at least one pin, and the pin is used to output the current value of the device; Determine the status of the device: The detector of the slave vehicle body controller is connected to the pin of the device, and the current value of the device is detected by the detector, and the status of the device is determined according to the current value of the device; Transmit to the master station vehicle body controller: then transmit the current value and status of the device to the master station vehicle body controller via the second vehicle local area network (CAN BUS); Device status display: The master station vehicle body controller transmits the device status to the display screen of the device through the first vehicle local area network (CAN BUS); and Storage of the current value of the device: The main station vehicle body controller transmits the current value of the device to the storage device of the equipment through the first vehicle local area network (CAN BUS) for storage. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the state of the device is further any one of a passage state and an open circuit state. As described in item 15 of the patent application scope, the vehicle body diagnosis method, when the device is in an open circuit state, the device displays any one of a warning light, a warning signal, a warning message, and a warning sound. As described in item 15 of the patent application scope, the vehicle body diagnosis method, when the status of the device appears to be a pass state, the device displays any one of a light, a signal, a message, and a sound. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the current value of the device is further provided with a trust interval, and the trust interval is a current value range set for the current value of the device to establish the credibility of the current value of the device. As described in item 18 of the patent application scope, the vehicle body diagnosis method, wherein when the current value of the device further falls within the trust interval, the device is normal. As described in item 18 of the patent application scope, the vehicle body diagnosis method, wherein when the current value of the device further falls outside the trust interval, the device is abnormal. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the device is further a smart cabin central control host. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the device is further provided with any one of a speaker and a buzzer. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the storage device of the device is further any one of a memory, a hard disk, and a server. As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the main station vehicle body controller is further provided with a microcontroller (MCU). As described in item 14 of the patent application scope, the vehicle body diagnosis method, wherein the slave station vehicle body controller is further provided with a microcontroller (MCU). The vehicle body diagnosis method as described in item 14 of the patent application scope, wherein the device is further for the vehicle's low beam, low beam, high beam, daytime running light, front fog light, rear fog light, front step light, middle step light, fluorescent light, trunk light, aisle light, luggage compartment light, advertising light box, front door, middle door, safety door, rear Cabin doors, air conditioning equipment, audio, station announcement system, tire pressure detector, rear mirror defogger, boarding and alighting equipment, front route machine, side route machine, rear route machine, route electromechanical facilities, broadcasting system, exit bell device, windshield blower, front exhaust fan, rear exhaust fan, front TV or rear TV.

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