The study of fault-tolerant data bus is one of the key technologies for transition from a centralized architecture to a open architecture.The key characteristics of data bus for open FADEC(full authority digital electronic control)system such as consistency

open

transmission bandwidth

scheduling strategies

topologies and fault-tolerant mechanism were studied.Time uncertain problem of bus data transmission was analyzed.The key characteristics of four data bus based on time trigger architecture

which are TTP/C(time-triggered protocol/automotive class C)

ARINC659

TTCAN and FlexRay(time-triggered controller area network)

were researched from the angle of performance

reliability and availability.The study results show that the TTP/C data buses is the best choice for open FADEC system

and the hardware architecture of modular DEEC (digital electronic engine controller)based on TTP/C data bus was proposed finally.