What are the effects of BMW FlexRay communication failure?
2 Answers
The effects of BMW FlexRay communication failure are: it may cut off communication between control units or the entire branch and the bus. Introduction to FlexRay: FlexRay is a brand-new bus system and communication system, with a maximum data transmission rate of 10MBit/s per channel, making FlexRay a very high-speed communication system. FlexRay is a high-speed, deterministic, and fault-tolerant bus technology for automobiles, which combines event-triggered and time-triggered methods, featuring high network utilization and system flexibility. It can serve as the backbone network for the next generation of automotive internal networks. Scope of application of FlexRay: FlexRay can be applied in passive bus and star network topologies, as well as in a combination of both topologies. Both topologies support dual-channel ECUs, which integrate multiple system-level functions to save production costs and reduce complexity.
I encountered a FlexRay communication failure while driving my BMW, which had significant direct impacts. The car would enter limp mode, with the engine power limited to low-speed operation, resulting in sluggish acceleration and rough transmission shifts, even causing jerking sensations. The steering system could malfunction, making the wheel heavier and increasing accident risks. Multiple warning lights would illuminate on the dashboard, such as the engine fault light or ABS alert. This also affected other functions, like the air conditioning and entertainment systems failing to work properly. Even worse, the issue could trigger chain reactions, such as rapid battery drain or data errors leading to complex long-term repairs. It's recommended to stop and inspect immediately upon noticing abnormalities and promptly visit a professional shop to diagnose wiring harness issues using specialized tools.
