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Distributorless ignition system with dwell control

  • US 5,058,021 A
  • Filed: 02/22/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 02/22/1990
  • Status: Expired due to Fees
First Claim
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1. In a marine craft distributorless ignition system with an engine having a plurality of cylinders and a plurality of ignition coils, each cylinder being coupled to an ignition coil and drive means coupled to said ignition coils for initiating for each cylinder in a firing order a dwell period in response to a first control signal to pull current through said cylinder'"'"'s coil creating a field, said drive means collapsing said field in response to a second control signal to generate a spark firing said cylinder, a controller for controlling the timing of firing of said cylinder comprising:

  • means for sensing when each of said cylinders reaches top dead center to provide a signal representative thereof;

    means responsive to said sensing means for determining the speed of said engine;

    means responsive to said determined engine speed for determining advance;

    a battery for providing power to said systems;

    means responsive to the voltage of said battery for determining a dwell time;

    means responsive to said sensing means for determining the interval between a first cylinder reaching top dead center and a preceding cylinder reaching top dead center; and

    firing time determining means being responsive to said interval and said advance for determining a delay time until said spark should be generated to fire said subsequent cylinder and being responsive to said delay time to spark and said dwell time for determining a delay time until said dwell period should be initiated.

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