Combustion state detecting device for an internal combustion engine

Abstract

A combustion state detecting device for an internal combustion engine enables diverse combustion state detection by obtaining a plurality of currents analogous to an ion current. The combustion state detecting device includes a bias circuit 6 that applies an ion current detection voltage to an ignition plug 3 disposed in a cylinder of the internal combustion engine, an ion current signal distributor circuit 20 made up of a current mirror circuit for detecting the ion current on the basis of a voltage from the bias circuit, and current-voltage converter circuits 21 and 22, to thereby produce a plurality of currents analogous to the ion current by the ion current signal distributor circuit.

Dependencies are inferred from the claim text.