Electric braking system for vehicle
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United States of America Patent
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Nov 29, 2016
Grant Date -
Jan 7, 2016
app pub date -
Mar 17, 2014
filing date -
Mar 15, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
When a braking operation amount is reduced, a stiffness value representing a ratio of variation in actual pressing force of a friction member to a variation in actual position of an electric motor are sequentially computed. The actual position when the stiffness value changes from being higher than or equal to a predetermined value to being lower than the predetermined value is stored as a candidate position. When a duration during which the stiffness value is lower than the predetermined value is shorter than a clearance corresponding value corresponding to a transmission member clearance in a state where the candidate position is stored, the candidate position is deleted. When the duration during which the stiffness value is lower than the predetermined value exceeds the clearance corresponding value, the stored candidate position is determined as a reference position at which the friction member and the rotary member begin contacting each other.
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