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Control circuit for automotive accessory system

  • US 4,578,591 A
  • Filed: 10/25/1984
  • Issued: 03/25/1986
  • Est. Priority Date: 10/25/1984
  • Status: Expired due to Term
First Claim
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1. A control circuit for selectively determining multiple modes of operation for one or more electrical loads in an automotive accessory system, the circuit comprising:

  • for a said load, a respective momentary action switch operatively associated with a signal potential and being responsive to an actuating force to provide a signal indicative of switch actuation only while said actuating force persists;

    microcomputer control means;

    means for extending said signal indicative of switch actuation to said microcomputer control means; and

    wherein said microcomputer control means repetitively, at brief intervals, determines the presence or absence of said actuation signal of a respective said switch and the duration of a said switch actuation signal, while present, relative to a predetermined time threshold and is operative following a determination that said switch actuation signal was present only for a momentary interval less than said predetermined threshold to effect control of a said load in a primary mode and is operative following a determination that said switch actuation signal was present for a dwell interval longer than said predetermined threshold to effect control of a said load in a secondary mode.

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