A CAN bus layout structure based on electric light truck

Abstract

The present invention discloses a CAN bus arrangement structure based on an electric light truck, which belongs to the field of CAN bus systems for light trucks. The CAN bus arrangement structure based on an electric light truck includes two CAN buses, each of which is composed of a plurality of controller nodes, shielded twisted pair CAN_H and CAN_L, and terminal resistors. The CAN bus arrangement structure based on an electric light truck disclosed by the present invention uses a CAN bus to connect various controller modules, thereby reducing the redundancy of the wiring harness, the complexity of the wiring harness, and the cost of the wiring harness, and improving the overall layout space of the automobile.

Description

[0001] In the field of technology

[0002] The invention relates to the field of a light truck CAN bus system, and in particular to a CAN bus arrangement structure based on an electric light truck. Background Art

[0003] Nowadays, automotive electronic technology is developing faster and faster, resulting in more and more electronic devices in cars and a reduction in the overall layout space of the car.

[0004] CAN bus is a data transmission communication protocol that can work in a variety of ways. Any node on the network can actively send messages to other nodes (controller ECU) on the network at any time, regardless of master or slave, and the communication method is flexible. In addition, CAN bus can receive data in the form of point-to-point or point-to-multipoint broadcasting. Summary of the invention

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a CAN bus layout structure based on an electric light truck, which uses the CAN bus to connect various controller modules, thereby reducing the redundancy of the wiring harness and the complexity of the layout, reducing the complexity of the wiring harness and the cost of the wiring harness, and improving the overall layout space of the car.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides a CAN bus arrangement structure based on an electric light truck, comprising two CAN buses, the two CAN buses are respectively a power bus PCAN and a body bus BCAN, the power bus PCAN includes nodes including a motor controller MCU, a battery management system BMS, a vehicle-mounted three-in-one module DCDC, DCAC and PDU, a vehicle controller VCU, and a gateway GW, the motor controller MCU, the battery management system BMS, and the vehicle-mounted three-in-one module electronic control unit ECU are connected in parallel on the power bus PCAN, the vehicle controller VCU and the gateway GW are connected in series on the power bus PCAN, 120Ω resistors are built-in at both ends of the vehicle controller VCU and the gateway GW, the power bus PCAN uses power shielded twisted pair cables PCAN_L and PCAN_H; the body bus BCAN includes nodes including a multi-function player MP5, an anti-lock braking system ABS, an air The multi-function player MP5, the anti-lock braking system ABS, the air-conditioning ECC, the low-speed alarm, the air-conditioning compressor EAS, the body control module BCM, the instrument cluster IC and the gateway are connected in parallel to the body bus BCAN, the instrument cluster IC is connected in series to the body bus BCAN, the instrument cluster IC and the gateway GW are respectively built-in with 120Ω terminal resistors at both ends, and the body bus BCAN adopts body shielded twisted pair cables BCAN_L and BCAN_H; the power bus PCAN and the body bus BCAN are connected in parallel through the gateway GW, and the gateway GW serves as a transfer device for the two-way bus data of the power bus PCAN and the body bus BCAN, and reads the two-way CAN bus data through the online diagnostic port OBD and analyzes and diagnoses the fault information occurring on the whole vehicle.

[0008] The beneficial effects of the present invention are:

[0009] 1. Use CAN bus to connect various controller modules, thereby reducing the redundancy of wiring harnesses, the complexity of wiring harnesses, the complexity and cost of wiring harnesses, and improving the overall layout space of the car;

[0010] 2. The power bus PCAN and the body bus BCAN are interconnected through the gateway GW, which can connect multiple different networks and repackage the received data to meet the needs of the system;

[0011] 3. Both ends of the power bus PCAN and the body bus BCAN are connected in series with terminal resistors to prevent data from being interfered by reflected data during transmission;

[0012] 4. Both the power bus PCAN and the body bus BCAN use shielded twisted pair cables. The data transmitted on the two data lines are the same, and the voltage values ​​are mirror images of each other, so that the voltage difference between the two twisted wires is kept at a constant value. The electromagnetic field effects generated will also cancel each other out due to the opposite polarity. Through this method, the data transmission line can be protected from interference from external radiation;

[0013] 5. The power bus PCAN and the body bus BCAN are connected in parallel through the gateway GW. The gateway GW serves as a data transfer device for the two CAN buses. It reads and analyzes the data of the two CAN buses through the OBD port to diagnose the fault information of the vehicle. Similarly, through different CAN bus ports on the OBD end, the fault analysis of the PCAN or BCAN bus can also be performed;

[0014] 6. The OBD port uses a standardized fast digital communication port to provide real-time data in addition to the standardized diagnostic trouble code DTC, allowing for rapid identification and remedy of vehicle faults. The OBD port can not only perform data collection, real-time analysis, real-time vehicle diagnosis, and real-time testing on each controller, but also perform real-time calibration of the controller's internal parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a simplified diagram of the vehicle CAN bus based on the CAN bus layout structure of an electric light truck provided by the present invention;

[0016] Figure 2 The present invention provides a CAN bus network topology connection diagram based on a CAN bus layout structure of an electric light truck.

[0017] In the figure:

[0018] 1. Motor controller; 2. Vehicle controller; 3. Battery management system; 4. On-board three-in-one module; 5. Online diagnostic port; 6. Gateway; 7. Multi-function player; 8. Electronic shifter; 9. Door; 10. Air conditioning; 11. Anti-lock braking system; 12. Low-speed alarm; 13. Instrument cluster; 14. Power bus; 15. Body bus; 16. Terminal resistor. DETAILED DESCRIPTION

[0019] The technical solution of the invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0020] like Figure 1 , Figure 2As shown, a CAN bus arrangement structure based on an electric light truck provided in this embodiment includes two CAN buses, the two CAN buses are respectively a power bus PCAN and a body bus BCAN, the nodes included on the power bus PCAN include a motor controller MCU, a battery management system BMS, a vehicle-mounted three-in-one module DCDC, DCAC and PDU, a vehicle controller VCU, and a gateway GW, the vehicle-mounted three-in-one module DCDC, DCAC and PDU are controlled by the vehicle-mounted three-in-one module electronic control unit ECU, the motor controller MCU, the battery management system BMS, and the vehicle-mounted three-in-one module electronic control unit ECU are connected in parallel on the power bus PCAN, and the vehicle controller VCU and the gateway GW are connected in series to the power bus PCAN. On the line PCAN, the vehicle controller VCU and the gateway GW are respectively equipped with 120Ω resistors at both ends. The power bus PCAN uses power shielded twisted pair cables PCAN_L and PCAN_H; the body bus BCAN includes nodes such as the multi-function player MP5, the anti-lock braking system ABS, the air conditioner ECC, the low-speed alarm, the air-conditioning compressor EAS, the body control module BCM, the instrument cluster IC and the gateway GW. The body control module BCM controls the use of the electronic shifter and the doors. The multi-function player MP5, the anti-lock braking system ABS, the air-conditioning ECC, the low-speed alarm, the air-conditioning compressor EAS, and the body control module BCM are connected in parallel on the body bus BCAN, and the instrument cluster IC is connected in series on the body bus On the BCAN line, the instrument cluster IC and the gateway GW are respectively equipped with 120Ω terminal resistors at both ends. The body bus BCAN uses the body shielded twisted pair BCAN_L and BCAN_H; the power bus PCAN and the body bus BCAN are connected in parallel through the gateway GW. The gateway GW serves as a transfer device for the data of the power bus PCAN and the body bus BCAN. The two CAN bus data are read and analyzed through the online diagnostic port OBD to diagnose the fault information of the whole vehicle. After the whole vehicle is powered on, the OBD port can be used to collect and analyze the data on the CAN bus, test the vehicle CAN network, and calibrate the data of each control unit. The CAN bus can be detected by using a multimeter on the OBD port. The terminal resistance value and the voltage value between CAN_H and ground, CAN_L and ground in the explicit or implicit state are collected by an oscilloscope to measure the baud rate value on the CAN bus. The CAN bus is used to connect various controller modules, thereby reducing the redundancy of the wiring harness, the complexity of the layout, the complexity of the wiring harness and the cost of the wiring harness, and improving the overall layout space of the car; the power bus PCAN and the body bus BCAN are interconnected through the gateway GW, which can connect multiple different networks and repackage the received data to meet the needs of the system; both ends of the power bus PCAN and the body bus BCAN are connected in series with terminal resistors to prevent data from being interfered by reflected data during transmission;The power bus PCAN and the body bus BCAN both use shielded twisted pair cables. The data transmitted on the two data lines are the same, and the voltage values ​​are mirror images of each other, so that the voltage difference between the two twisted wires is kept at a constant value. The electromagnetic field effects generated will also cancel each other out due to the opposite polarity. Through this method, the data transmission line can be free from interference from external radiation; the power bus PCAN and the body bus BCAN are connected in parallel through the gateway GW. The gateway GW serves as a data transfer device for the two CAN buses. The data of the two CAN buses are read and analyzed externally through the OBD port to diagnose the fault information occurring on the vehicle. Similarly, through different CAN bus ports on the OBD end, the fault analysis on the PCAN or BCAN bus can also be performed; the OBD port uses a standardized fast digital communication port to provide real-time data in addition to the standardized diagnostic fault code DTC, allowing for rapid identification and remedy of vehicle faults. Through the OBD port, not only can data collection, real-time analysis, real-time vehicle diagnosis, and real-time testing be performed on each controller, but also the real-time calibration function of the internal parameters of the controller can be performed. ;

[0021] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A CAN bus layout structure based on an electric light truck, comprising two CAN buses, the two CAN buses being a power bus PCAN and a body bus BCAN, characterized in that: The nodes included in the power bus PCAN include the motor controller MCU, the battery management system BMS, the vehicle-mounted three-in-one module DCDC, DCAC and PDU, the vehicle controller VCU, and the gateway GW. The motor controller MCU, the battery management system BMS, and the vehicle-mounted three-in-one module electronic control unit ECU are connected in parallel on the power bus PCAN. The vehicle controller VCU and the gateway GW are connected in series on the power bus PCAN. The vehicle controller VCU and the gateway GW are respectively built-in with 120Ω resistors at both ends. The power bus PCAN uses power shielded twisted pair cables PCAN_L and PCAN_H; The body bus BCAN includes nodes including a multi-function player MP5, an anti-lock braking system ABS, an air conditioner ECC, a low-speed alarm, an air conditioner compressor EAS, a body control module BCM, a combination meter IC and the gateway GW, wherein the multi-function player MP5, the anti-lock braking system ABS, the air conditioner ECC, the low-speed alarm, the air conditioner compressor EAS, and the body control module BCM are connected in parallel to the body bus BCAN, and the combination meter IC is connected in series to the body bus BCAN, and both ends of the combination meter IC and the gateway GW are respectively built-in with a 120Ω terminal resistor, and the body bus BCAN uses body shielded twisted pair wires BCAN_L and BCAN_H; The power bus PCAN and the body bus BCAN are connected in parallel through the gateway GW. The gateway GW serves as a transfer device for the two-way bus data of the power bus PCAN and the body bus BCAN. The two-way CAN bus data is read through the online diagnostic port OBD and the fault information occurring on the vehicle is analyzed and diagnosed.

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