Electronic control device and abnormalityormality determination method of electronic control device

摘要

An electronic control device has a compact abnormality detection circuit that does not require a complicated circuit, and is capable of suppressing a cost increase when being applied a direct injection injector drive circuit and other drive circuits. A current detection circuit includes a current detection resistor, a differential amplifier, and a current detection unit. The current detected is supplied to the abnormalityormality determination unit. A combined resistance value of a diagnostic current drive circuit and the current detection resistor is higher than an injector drive circuit. A fuel injection signal is input to a logic circuit, and a fuel cut signal is input to a different terminal of the logic circuit. The logic circuit's output terminal is connected to the injector drive circuit's gate. The output signal from a fuel injection signal output unit is supplied via a switch to the diagnostic current drive circuit's gate.