Patent ID: 7521904

Claim:
A device for detecting errors in a charging line, in which a power generation instruction signal is transmitted from an external controller to a vehicle power generation controller controlling a power generation state of a vehicle generator and the device detects an error in the charging line connecting the vehicle generator and an on-board battery, the device comprising: a bias circuit that biases a voltage of an external terminal receiving the power generation instruction signal in the vehicle power generation controller with a voltage of an output terminal of the vehicle generator; a charging line error detection means that detects errors in the charging line based on a voltage of an output terminal of a power generation instructing means and a terminal voltage of the on-board battery, wherein the error detection means is provided within the external controller and power generation instructing means generates the power generation instruction signal; and a warning means that performs a warning operation to give notification of an errors when the charging line error detecting means detects the error in the charging line.