High energy density inductive coils for approximately 300 ma spark current and 150 mj spark energy for lean burn engines
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United States of America Patent
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Feb 27, 2007
Grant Date -
Nov 30, 2006
app pub date -
May 23, 2006
filing date -
May 24, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high energy density and high efficiency inductive ignition coil for IC engine achieved by the use of biasing magnets (14/15) located at the end (16/17) of an open-E laminated core to raise the coil energy to five times typical, i.e. of approximately 150 mj and to double the coil efficiency including novel use of coil winding structure (12/13/20/21) with a primary winding turns (Np) of between 70 and 86 and primary inductance Lp of between 700 uH and 1,100 uH, and a low turns ratio (Nt) of 53 to 67 allowing for a short, efficient, cylindrical coil, with secondary turns (Ns) of 4,000 to 5,000 turns with current of approximately 330 ma which is predominantly in the high glow and low arc discharge mode, with a special ratio R defined as Np/Nt and equal to between 1.15 to 1.45, and the coil being small and light enough to be directly mounted on the spark plugs or near the plugs in a region of high squish flow in an engine.
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