| 摘要 |
PURPOSE:To utilize the operation time of the lead storage battery effectively at a maximum irrelevantly to variance in the discharge characteristics of the lead storage battery by finding variation in the terminal voltage across the lead storage battery per unit time and generating an alarm when the value exceeds a previously set reference value. CONSTITUTION:This device is equipped with a voltage detecting means (a) which detects the terminal voltage across the lead storage battery 1, an arithmetic means (b) which inputs its detected value and calculates the variation in the detected value per unit time, a comparing means (c) which compares the arithmetic value with the reference value, and a warning means (d) which generates an alarm when the arithmetic value exceeds the reference value. The voltage variation per unit time has a value indicating the gradient of the discharge characteristic curve. The gradient of the discharging characteristic at an alarm generation point of time is actually close to 90 deg. on the time base, so the time from the alarm generation to a discharging end voltage is not relevant to variance in the discharging characteristics of the lead storage battery so much and nearly constant. |
