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System and method for driving a tachometer

  • US 20050116703A1
  • Filed: 11/10/2004
  • Published: 06/02/2005
  • Est. Priority Date: 11/13/2002
  • Status: Active Grant
First Claim
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1. An electronic driver for producing an output waveform for use by a tachometer, comprising:

  • an input line connected in series with at least one ignition coil, the at least one ignition coil driven during at least one current dwell period per an ignition cycle, wherein input signals representative of single and multiple sparks are received on the input line from the at least one ignition coil; and

    a controller coupled to the input line, the controller programmed to discriminate between the single and multiple sparks represented by the input signals during consecutive ignition cycles, the controller further programmed to responsively form an output waveform having substantially equally spaced pulses.

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