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AssigneesNippon Soken, Inc., Toyota Jidosha Kogyo Kabushiki Kaisha
InventorsYoshiki Ueno, Takakazu Kawabata, Tadashi Hattori, Kazuhiko Miura
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An ignition system for internal combustion engine, which controls the ignition coil primary current according to the magnitude of the floating capacitance in the secondary side wiring section of the ignition coil, by determining the floating capacitance from the negative slope of rising of the secondary voltage produced in the ignition coil in response to the cutoff of the primary current and the primary cutoff current value, the slope being determined by measuring the period T until the secondary voltage reaches a predetermined voltage value. When the floating capacitance is increased, the primary cutoff current value is increased to increase the coil energy so as to increase the secondary voltage generated in the ignition coil for preventing the generation of a miss-spark.
An ignition system for an internal ignition engine comprising a secondary voltage rising slope measuring circuit for measuring the slope of rising of the secondary voltage produced in an ignition coil, a primary cutoff current measuring circuit for measuring the primary current in the primary coil of said ignition coil immediately before said primary current is cutoff, and a calculating circuit for producing an output representing the floating capacitance present in the ignition system from said slope measured by said secondary voltage rising slope and said primary cutoff current measured by said primary cutoff current measuring circuit and for producing an output representing the secondary voltage.
Dependencies are inferred from the claim text.