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Abstract
A structural design was proposed in our previous study for a fault tolerant steer-by-wire (SBW) system consisting of a principal SBW, a standby SBW and a mechanical backup possibly with a power assist feature. The authors used fault trees, minimal cut sets, and minimal path sets to derive an operation procedure. The present paper converts this operation procedure into a Markov transition diagram where each state represents either a normal SBW, or a partially degraded or a completely failed SBW. The system reliability is quantified in terms of the state probabilities calculated from a numerical integration of the Markov diagram specified by component failure rates. It turns out that the SBW design demonstrates a considerably high reliability through the introduction of mechanical backup. The power assist, however, is rarely expected for the mechanical backup mode. This mode can be reduced by ECU reliability improvement.
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