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Ignition system for internal combustion engines

  • US 4,892,073 A
  • Filed: 09/07/1988
  • Issued: 01/09/1990
  • Est. Priority Date: 09/10/1987
  • Status: Expired due to Term
First Claim
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1. An ignition system for internal combustion engines comprising an electronic control unit for computing an ignition timing electronically in accordance with parameters of an internal combustion engine, computing an energization time of an ignition coil and producing a pulse-shaped ignition signal in accordance with a result of the computation, and ignition circuit means for interrupting a primary current of the ignition coil on the basis of the ignition signal supplied from said electronic control unit and producing an ignition monitor signal, wherein said ignition circuit means includes set means for setting the ignition monitor signal at a timing of starting energization of the ignition coil, first reset means for resetting the ignition monitor signal when the primary current of the ignition coil has exceeded a first reference level and has reached a second reference level higher than the first reference level, second reset means for resetting the ignition monitor signal when the primary current of the ignition coil is interrupted before the primary current reaches the second reference level after the primary current has exceeded the first reference level, and maintenance means for maintaining a preceding state without resetting the ignition monitor signal when the primary current does not reach the first reference level.

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