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US 6,142,130 AGranted
Low inductance high energy inductive ignition system
OwnerMichael A. V. Wardinventor
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OwnerMichael A. V. Wardinventor
Estimating the term…
A high power, high energy inductive ignition system with a parallel array of multiple ignition coils Ti (2a, 2b) and associated 600 volt unclamped IGBT power switches Si (8a, 8b), for use with an automotive 12 volt storage battery (1), the system having an internal voltage source (12) to generate a voltage Vc approximately three times the peal primary coil current with coils Ti of low primary inductance of about 0,5 millihenry and of open E-type core structure for spark energy in the range of 120 to 250 mj, the system using a lossless snubber and variable control inductor (6) to provide very high circuit and component efficiency and high coil energy density, in mj/gm, three times that of conventional inductive ignition systems, and high output voltage of 40 kilovolts with fast rise time of 10 microseconds.
An inductive ignition system operating at a voltage Vc with a high (voltage) end and low end, the ignition system having one or more ignition coils Ti and associated power switches Si, where i=1,2, . . . n, with each coil Ti having a primary winding of inductance Lp and primary turns Np, and a secondary winding with turns Ns, the coil primary and secondary windings defining a turns ratio N equal to Ns/Np,
An inductive ignition system having one or more ignition coils Ti and associated power switches Si, where i=1, 2, . . . n, with each coil Ti having a primary winding of inductance Lp and primary turns Np, and a secondary winding with turns Ns defining a turns ratio N equal to Ns/Np, the system further including a variable control inductor of initial inductance Lsati located between a voltage source powering the ignition and common connections of the primary windings of said coils one or more coils, the variable inductance operating such that upon switch Si closure the voltage across the coil Ti secondary winding is reduced from the value that it would take on without said variable control inductor.
An inductive ignition system operating at a voltage Vc between 24 and 80 volts with a peak primary current Ipo of at least 20 amps having one or more ignition coils Ti and associated power switches Si, where i=1,2, . . . n, with each coil Ti having a primary winding of inductance Lp and primary turns Np, and a secondary winding with turns Ns defining a turns ratio N equal to Ns/Np, the system further constructed and arranged to provide a turns ratio N of sufficiently low ratio, a spark gap Gi of sufficient width, and a dwell time Tdw, during which time switch Si is closed, of sufficiently short duration so that upon switch Si closure the spark gap Gi does not break down, and upon switch Si opening a high voltage of value Vs is produced across the coil secondary winding to electrically breakdown said spark gap Gi and produce a peak spark current Is in substantially arc mode.
Dependencies are inferred from the claim text.