Brakes – With condition indicator – Wear
Reexamination Certificate
2004-06-21
2008-11-04
Schwartz, Christopher P (Department: 3683)
Brakes
With condition indicator
Wear
C188S158000, C303S020000, C701S070000
Reexamination Certificate
active
07445091
ABSTRACT:
An electrically operated brake device in which braking force differences between electrically operated brakes are reduced to prevent unstable vehicle traveling during braking.Motors13of electrically operated brakes are returned to standard positions during the stop of a vehicle and the motor13of each of the brakes is driven for a predetermined amount, pressing a brake pad17against a disc rotor18to produce a braking force.An electric current value of each motor13in the above operation is measured and differences between the values are calculated. Electric current of each motor is increased or decreased so that there is no current difference between the motors13. Based on a drive amount of each motor in this operation, standard positions of the motors are determined and updated. Repeating the above operations reduces braking force differences between the brakes.
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Kawahara Yoshinari
Ohno Kousaku
Sasaki Mitsuhide
Yokoyama Atsushi
Crowell & Moring LLP
Hitachi , Ltd.
Schwartz Christopher P
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