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The Research and Design of Automobile Multi-function Display Based on Fault-tolerant CAN Bus

Author: XuPingXia
Tutor: XuDongPing；LuLiPing
School: Wuhan University of Technology
Course: Computer Science and Technology
Keywords: CAN bus CAN protocol stack Vehicle display terminal Bluetooth hands-free Parking aid
CLC: TN873
Type: Master's thesis
Year: 2011
Downloads: 103
Quote: 0
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Abstract


Vehicle network system has been widely used in the automotive industry, and replace it with a huge traditional wiring system. CAN bus is the most widely used network standard one, it supports distributed real-time control with high performance and high reliability characteristics. However, along with the increase of interior automotive electronic systems, put forward higher requirements on the internal electronic information management system. The same time, taking into account the driver while driving can not use the phone to make and receive calls. Therefore, the need for a multi-function display terminal to provide real-time information of vehicle electronic systems and hands-free phone function. Embedded Linux operating system, according to the needs of the the CAN bus characteristics and vehicle-mounted multi-function display terminals, based on the design of fault-tolerant CAN bus vehicle multifunction display terminal. First, the CAN protocol stack, complete data transceiver, bus run mode management as well as fault-tolerant characteristics. Then, according to the CAN protocol stack developed by vehicle multifunctional display terminal through the CAN bus and the parking assist system for communication, thereby completing the parking state of the graphical display. Finally, add in the car multi-function display terminal Bluetooth phone hands-free application modules, control Bluetooth phones using Bluetooth technology, can eventually direct hands-free calls in the car on the multi-function display terminal. Use ARM9 S3C2440A processor, S3C2440A not integrated CAN bus controller, and therefore, the choice of the MCP2510 as CAN bus controller. Combination of the S3C2440A characteristics CAN protocol stack developed under the Linux operating system, including CAN interface driven development. The protocol stack is the follow OSEK / VDX standard. Based on the CAN protocol stack development, S3C2440A communicate via CAN bus parking assist system. Parking assist system information frame definition detailed analysis, and graphical display of the car parking process and the obstacles in all directions from the relationship. Finally, developed based on Bluez protocol stack Bluetooth hands-free telephone applications, vehicle-mounted multi-function display terminal connected through the USB interface with Bluetooth USB adapter. Bluetooth hands-free application framework HFP handsfree application reference board multifunction display terminal as the hands-free unit, Bluetooth phone as an audio gateway. Analysis the HFP framework layers protocols work, Bluez API defined in the completion of the HFP HCI, SDP and RFCOMM Protocol software design. And send AT commands to control the operation of the Bluetooth phone dialing, call processing, phone book download and volume control, Bluetooth hands-free telephone function, and ultimately through the establish SCO connection channel to transmit voice data. Run the test several times, basically each functional module design goals, consider driving safety with easy to operate with high reliability vehicle multifunction display terminal.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display
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