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Brake condition monitoring

  • US 7,497,305 B2
  • Filed: 04/26/2006
  • Issued: 03/03/2009
  • Est. Priority Date: 08/04/2000
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the usage of aircraft brake members having facing friction surfaces, the method comprising:

  • detecting each actuation of the brake members;

    making a separate record of each actuation in which there is relative movement of the facing friction surfaces which causes wear; and

    determining brake usage from that record, the method of determining relative movement of the facing friction surfaces which causes wear including the steps of;

    detecting a change in temperature of the brake members on actuation thereof;

    generating signals according to the detected changes in temperature;

    twice differentiating said signals and;

    identifying from said signals actuations of the brake members which cause a change in temperature that is an increase above a pre-selected threshold value by comparing said twice differentiated signals with said pre-selected thereshold value and identifying those actuations that cause a change in temperature that is an increase above said pre-selected threshold value as actuations in which there is relative movement of the facing friction surfaces that causes wear.

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