Rede de comunicação – Visão geral

418-00-4 Module Communications Network 418-00-4 DESCRIPTION AND OPERATION Item Description 7 Body control module (BCM) 8 Battery monitoring system Rain sensor 10 Battery backed sounder 11 Interior motion sensor 12 Electric booster heater 13 Trailer module 14 Parking assist control module 15 Passenger front door module 16 Rear door module Network components Dependent on the vehicle accessories version, two data bus systems are used: ‡ Controller Area Network (CAN) bus ‡ Local Interconnect Network (LIN) bus Due to the increased number of modules and the resulting continued increase in data transfer, three different CAN bus systems are used. Essentially, they only differ in terms of their data transmission rates and application areas. In order to be able to distinguish between the individual CAN bus systems, the CAN bus system with the higher data transfer rate is referred to as the high-speed (HS) CAN bus, the CAN bus system(s) with the lower data transfer rate as the mid-speed (MS) CAN bus or multimedia (MM) CAN bus. The latter operate at a slower speed and are used primarily for communications in comfort electronics. Two interfaces (gateways) are used in order to exchange data between the HS CAN bus, MS CAN bus and the MM CAN bus. These provide the connection between the three CAN databus systems and are installed in the BCM and in the electronic instrument cluster. The number of modules which are connected to the three databus systems depends on the equipment level of the vehicle. Controller area network (CAN) General In the past, a separate cable was needed for every command and every message. The use of Item Description 17 Driver front door module 18 Multi-power window switch pack 19 Dual zone electronic temperature control 20 Instrument panel cluster 21 Bluetooth/Voice control 22 Multifunction display/Navigation multifunction display 23 Integrated control panel 24 Audio head unit 25 Tracking and blocking module networks has enabled an increase in functionality without additional cables. The demand for greater functionality in vehicles, both due to legal requirements and in order to meet customer demands, results in increasing complexity of vehicle systems. The Controller Area Network (CAN) was developed as part of the effort to achieve greater flexibility of the electrical systems. It allows a large number of different control commands and messages to be sent and received on the same cable system. The number of control commands and messages which can be processed by a network depends on factors like the data transfer rate and the length of the messages. The SMAX/Galaxy network, which is based on a Controller Area Network (CAN), is capable of transferring over 500 different signals and approx. 100 messages. These messages are also described as transmission blocks and may contain several signals. Advantages of a network Easy integration of additional functions and DFFHVVRULHV As the control modules in the network are already connected to each other and can easily accept further information, only the following steps are necessary: