Determining current representing measurement value flowing through load in vehicle

摘要

The measurement resistance is by and large lying at a reference potential, and the output voltage (UA) of the operation amplifier is determined as the reference correction voltage (UKORR B), and a measurement resistance is set on the highest battery potential. The battery voltage is measured as the calibrating battery voltage (UBATTK). The output voltage (UA) of the operation amplifier is measured as the calibrating-correction voltage (UKORRK) and a measuring operation is carried out as follows: the output voltage (UA) of the operation amplifier is measured. The battery voltage (UBATT) is measured and the measurement value (UM) is determined as follows: UM = UA-UKORRK-UKORRB)/UBATTK.UBATT.