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Ignition timing and detonation controller for internal combustion engine ignition system

  • US 4,377,997 A
  • Filed: 10/11/1979
  • Issued: 03/29/1983
  • Est. Priority Date: 10/11/1979
  • Status: Expired due to Term
First Claim
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1. In an alternator driven capacitor discharge system for an internal combustion engine having capacitor means, and an alternator including first coil means for providing electrical pulses for charging said capacitor means, said electrical pulses having a frequency related to engine speed, and second coil means for providing a biasing signal for regulating the timing of the discharge of said capacitor means and tending to effect timing advance as engine speed increases, the improvement comprising:

  • means responsive to the frequency of said electrical pulses for modifying said biasing signal so as to effect additional timing advance when engine speed exceeds a predetermined speed,said means responsive to the frequency of said electrical pulses including advance timer means which operates to effect timing advance in proportion to the increase in engine speed above said predetermined speed until a second predetermined speed is reached, and retard timer means which operates to effect a reduction in timing advance in proportion to the increase in engine speed above said second predetermined speed until engine speed returns to said second predetermined speed;

    and means responsive to engine detonation for further modifying said biasing signal so as to effect a reduction of said additional timing advance when detonation exceeds a predetermined level.

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