FlexRay bus and CAN bus are used in automotive electronic control system data transmission bus, their differences are as follows:
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1. Different transmission rates: FlexRay bus has a higher transmission rate, up to 10 Mbps, while CAN bus transmission rate is lower, generally 1 Mbps.
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2. Different timing mechanism: FlexRay bus adopts a more stringent time allocation mechanism. Before communication on the bus, bus bandwidth needs to be precisely scheduled and allocated to ensure real-time and reliability of data transmission; However, the CAN bus adopts the event-based time mechanism and requires relatively low event response delay.
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3. Different scalability: FlexRay bus was designed with high scalability in mind, so it supports a variety of different network topologies and can be switched between different topologies; However, CAN bus is suitable for relatively simple network architecture, which is difficult to meet the needs of complex systems.
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4. Different cost: FlexRay bus is more expensive than CAN bus because its high performance, high reliability and high scalability require more complex and expensive hardware equipment and software technology.
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In summary, although both are used for data transmission buses in automotive electronic control systems, they need to be selected according to specific needs and technical characteristics in different application scenarios.