| 摘要 |
<p>A battery state of charge indicator for a vehicle starter battery which includes a) means for periodically measuring the output voltage (u), the current (i) being withdrawn from or supplied to the battery, and the temperature (T) of the battery, b) battery current integrating means for integrating the battery current (i) with respect to time to produce an indication of the net charge (q) taken from the battery, c) means responsive to successive measured values of battery voltage (u), current (i) and temperature (T) and to the net charge (q) taken from the battery to predict the net charge (qe) which can still be withdrawn from the battery, is characterised by: d) means for generating an indication of the gassing current (ig) flowing inside the battery from the battery current (i), and e) means for adding the gassing current (ig) to the battery current (i) prior to integration thereof to correct for the effect of gassing current in the indication of withdrawn charge (q) taken from the battery and hence in the withdrawable charge (qe) which can still be withdrawn from the battery.</p> |
