Patent ID: 7586311
Filing Date: 2009-09-08
Classification: B60K,B60L,B60W,H02J,H02P,Y02T

Abstract:
1. An abnormality monitoring apparatus for a load driving circuit including a converter performing at least one of a voltage boosting operation and a voltage stepping-down operation and a battery connected to an input side of said converter, said load driving circuit supplying electric power from said converter to a load, said apparatus comprising: first sensing means for sensing a voltage value of said battery; second sensing means for sensing a voltage value on an output side of said converter; battery voltage estimation calculating means for calculating an estimated voltage value of said battery; and monitoring means for, when said converter is performing the voltage boosting operation or the voltage stepping-down operation, sensing tentative abnormality of said first sensing means based on an absolute value of a difference between a voltage value of said battery sensed by said first sensing means and said estimated voltage value, and sensing tentative abnormality of said second sensing means based on an absolute value of a difference between a voltage value on the output side of said converter sensed by said second sensing means and a voltage instruct value to said converter.