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Electrically operated braking system having a device for operating electric motor of brake to obtain relationship between motor power and braking torque

  • US 6,425,643 B2
  • Filed: 06/22/2001
  • Issued: 07/30/2002
  • Est. Priority Date: 07/29/1997
  • Status: Expired due to Fees
First Claim
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1. A braking system for a motor vehicle having a wheel comprising:

  • a rotor rotating with said wheel;

    a friction member movable to be forced onto said rotor, for braking said wheel;

    a support member for supporting said friction member in frictional contact with said rotor so as to prevent said friction member from being rotated with said rotor;

    a pressing device for forcing said friction member into frictional contact with said rotor;

    a force sensor for detecting a force which is generated in a rotating direction of said rotor, due to a frictional contact of said friction member with said rotor;

    a pressing-force-related quantity sensor whose output varies continuously with a quantity relating to a pressing force by which said friction member is forced onto said rotor by said pressing device; and

    a friction coefficient estimating device for estimating a friction coefficient of said friction member, on the basis of a relationship between said output of said pressing-force-related quantity sensor and an output of said force sensor.

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