Electronic control device and abnormality / normal state determination method of an electronic control device

摘要

An electronic control apparatus having an abnormality detecting circuit which is compact, does not require a complicated circuit and is capable of suppressing an increase in cost when applied not only to a direct injection injector driving circuit but also to other driving circuits is realized , A current detection unit 9 includes a current detection resistor 91, a differential amplifier 92, and a current detection unit 93. The current detected by the current detection unit 93 is supplied to an abnormality / normal state determination unit 17. A combined resistance value of a diagnosis current drive circuit 7 and the current detection resistor 91 is higher than a resistance value of an injector drive circuit 3. A fuel injection signal 4 is applied to an input terminal of a logic circuit 6, and a fuel cutoff signal is applied to a negative input terminal of the logic circuit 6. An output terminal of the logic circuit 6 is connected to a gate of the injector drive circuit 3. The output signal 4 from a fuel injection signal output unit 14 is supplied via a switch 8 to a gate of the diagnostic current drive circuit.