Patent ID: 9217765
Filing Date: 2015-12-22
Classification: B60L,G01R

Abstract:
1. A method comprising: driving a voltage sensor with a 5 VDC reference voltage; measuring, via the voltage sensor, a voltage between electrical ground and a conductive rail of a voltage bus in an electrical system having a voltage source and an electrical load that is selectively connectable to the voltage source via a contactor, including outputting a voltage signal from the voltage sensor at 0.5 VDC for a measured voltage of 0 VDC and at 4.5 VDC for a measured voltage that is equal to a first threshold voltage; receiving the measured voltage from the voltage sensor using a controller when the contactor is open; comparing the received measured voltage to the first threshold voltage, wherein the first threshold voltage corresponds to a calibrated voltage reading of the voltage sensor that is expected when the contactor is closed; recording a first diagnostic code in a memory device of the controller, thereby indicating a stuck-in-range failure status for the voltage sensor, when the received measured voltage is greater than 0 and less than the first threshold voltage; and recording a second diagnostic code in the memory device, thereby indicating a stuck-closed status for the contactor, when the received measured voltage is equal to the first threshold voltage.