A system for detecting the failure of a voltage source for a force of a vehicle control device.

摘要

PURPOSE:To enable an abnormality, not only the presence thereof but also including its nature, in the power supply of vehicle-borne control equipments to be accurately detected by providing vehicle speed detecting means, first judging means, power supply voltage detecting means, second judging means and abnormality judging means. CONSTITUTION:Vehicle speed detecting means and first judging means for receiving a signal from the vehicle speed detecting means and generating a signal when a vehicle speed above a prescribed value continues for a prescribed time or more are provided. Further, power supply voltage detecting means and second judging means for receiving a signal from the power supply voltage detecting means and generating a signal when a power supply voltage is below a prescribed value are provided. Abnormality judging means judges the generation of an abnormality in a power supply system when the abnormality judging means receives signals from both the first and second judging means.