| 摘要 |
PURPOSE:To automatically correct an integral error in the arithmetic measurement of the retention quantity of electricity of a storage battery without periodic overcharging by correcting the retention quantity of electricity based on the detected values of an upper-limit detecting means and a lower-limit detecting means. CONSTITUTION:A voltage divider 10 as the upper-limit detecting means consists of resistors 10a-10c connected in series and connected across the series circuit of the storage battery 4 and a shunt 5 by detect the terminal voltage across the storage battery 4. A float type specific gravity sensor 11 as the lower-limit detecting means is fitted in the battery jar 4a of the storage battery 4 to detect the specific gravity of the electrolyte of the storage batter 4 and also has a contact 11a which is made when the specific gravity decreases below a prescribed value. Then when one detecting means detects a lower-limit or upper- limit value, the retention quantity of electricity which is found by arithmetic measurement based upon a specific expression is corrected automatically to a value corresponding to the upper-limit or lower-limit value to put to the storage battery in operation between the upper-limit value and lower-limit value at any time.
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