×

Programmable service reminder apparatus and method

  • US 4,613,939 A
  • Filed: 08/08/1984
  • Issued: 09/23/1986
  • Est. Priority Date: 08/08/1984
  • Status: Expired due to Fees
First Claim
Patent Images

1. A programmable service reminder apparatus for a vehicle, said vehicle being controllably energizable from a vehicle power source, comprising:

  • sensor means for producing a control signal in response to said vehicle being energized;

    clock means for producing a periodic time base signal;

    service status indicator means for signaling an elapsed period of time;

    first switch means for producing a service time reset signal;

    programmable memory means for receiving and storing data; and

    ,processor means for receiving said control signal, said periodic time base signal and said service time reset signal;

    repeatedly producing an incremental elapsed time signal in response to receiving said control signal and said periodic time base signal and periodically storing the instant elapsed time signal to said programmable memory means;

    sequentially producing a plurality of discrete predetermined service time signals in response to receiving said service time reset signal, the number of said predetermined service time signals produced being responsive to the period of time said service time reset signal is continuously received, combining the last stored elapsed time signal and the last produced predetermined service time signal to form a combined time signal, and responsively storing said combined time signal to said programmable memory means; and

    repeatedly comparing the instant elapsed time signal and said stored combined time signal and energizing said service status indicator means in response to the instant elapsed time signal being greater than said stored combined time signal.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×