Patent ID: 6201373
Filing Date: 2001-03-13
Classification: B60K,B60W,G01R,Y02T,Y10S

Abstract:
A battery remaining capacity measuring apparatus comprising:a voltage sensor for detecting a terminal voltage of a battery connected to a load;a current sensor for detecting a current flowing from the battery to the load;a collecting means for collecting a voltage value detected by the voltage sensor and a current value detected by the current sensor every predetermined time;a first determining means for determining whether or not a predetermined number of pairs of the voltage values and the current values are collected;a processing means for when the predetermined number of the plural pairs are collected, averaging the voltage values and the current values respectively so as to obtain a pair of an average voltage value and average current value and repeating the processing for obtaining the pair of the average voltage value and average current value;a second determining means for determining whether or not the processing by the processing means is continued in the shortest time from beginning of discharge from the battery to termination thereof;a means for when it is determined that the processing by the processing means is continued in the shortest time, obtaining a correlation value between voltage and current based on plural pairs of the average voltage values and the average current values;a means for when the correlation value indicates a stronger correlation than a predetermined level, obtaining an approximate line on current-voltage coordinate system based on the plural pairs of the average voltage values and the average current values; andan estimating means for estimating a remaining capacity of the battery by obtaining a corresponding voltage value based on the approximate line and a preliminarily set current value.