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Anti-lock brake system with piezoelectric brake actuator

  • US 6,213,564 B1
  • Filed: 03/19/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 04/15/1997
  • Status: Expired due to Fees
First Claim
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1. An electrical braking system, comprising:

  • first friction braking means comprising;

    a first piezoelectric ceramic layer having opposing first and second major faces; and

    a first prestress layer bonded to said first major face of said piezoelectric ceramic layer;

    wherein said first prestress layer normally applies a compressive force to said first piezoelectric ceramic layer;

    a first moveable member to be braked;

    an electric controller for generating a first electrical output signal for operating said first friction braking means in accordance with brake force demand inputs, said electric controller having an input side and an output side;

    a first electrical conductor connected on a first end to said output side of said electric controller and on a second end across said first and second faces of said first piezoelectric ceramic layer of said first friction braking means;

    actuating means for generating a first brake force demand input signal for said controlling means, said actuating means comprising;

    a mechanical input device for generating a variable mechanical signal;

    an electrical signal generator for generating a first brake force demand input signal proportional to said variable mechanical signal;

    said electrical signal generator being in mechanical communication with said mechanical input device and in electrical communication with said input side of said electric controller;

    a first wheel slip sensing means for determining a first wheel-road slippage condition, said first wheel slip sensing means comprising;

    a first wheel speed sensor for sensing a peripheral wheel speed;

    said first wheel speed sensor having an output signal proportional to said peripheral wheel speed;

    first slip computing means for computing an acceleration and a vehicle body speed;

    said first slip computing means comparing said sensed peripheral wheel speed to said computed acceleration and said computed vehicle body speed to determine if said first wheel-road slippage condition exists; and

    first signal generation means for generating a second brake force demand input signal indicative of said first wheel-road slippage condition;

    said first signal generation means being in electrical communication with said input side of said electric controller;

    whereby electrically energizing said first friction braking means moves said friction braking means into contact with said first moveable member;

    and whereby a first braking force is generated by moving said first friction braking means into contact with said first moveable member.

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