Importance

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Abstract

An object is to reduce the required numbers of connector pins and A/D converters, without degrading the detection accuracy. There is provided an ignition apparatus which includes: ignition plugs provided for multiple cylinders; an ignition coil provided for each cylinder, and having a primary coil and a secondary coil magnetically coupled to the primary coil and connected to the ignition plug; switching devices each for switching between application and shut-off of current to the primary coil; a primary-voltage-signal separator provided for each cylinder, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal; a primary-signal combiner for electrically combining together each primary signal corresponding to each cylinder, to thereby output a composite primary signal; and a primary-voltage-information detector for inputting thereto the composite primary signal, to thereby output primary voltage information of each cylinder.

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First Claim