| 摘要 |
PURPOSE: A steering angular speed estimating method and a fail or safe detecting method using the same are provided to detect fail or safe by estimating a steering angular speed with a phase current and by comparing the estimated steering angular speed to the steering angular speed detected through a steering angle sensor. CONSTITUTION: A phase current generated in the operation of a BLAC motor of an MDPS is measured by a current sensor (S110). When the phase current is measured in the current sensor, whether the phase current is over a predetermined triggering level is determined by comparing the phase current with the triggering level with a steering angular speed estimation unit (S120). When the phase current is over the triggering level, a cycle of the phase current is detected (S130). When the cycle of the phase current is detected, a steering angular speed is calculated (S140). [Reference numerals] (AA) Start; (BB) End; (S110) Phase current measurement; (S120) Is it over a triggering level?; (S130) Detect a cycle of a phase current; (S140) Calculate a steering angular speed by using a cycle of a phase current
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