Patent ID: 6118252
Filing Date: 2000-09-12
Classification: G01R

Abstract:
A process for determining starting capacity of a starter battery of a motor vehicle, comprising the steps of:(a) determining a voltage surge of the battery as a function of a measured battery temperature and engine temperature;(b) storing the determined voltage surge as a function of the measured battery temperature and measured engine temperature;(c) comparing the determined voltage surge with stored characteristic voltage values of a characteristic line field comprising a mean value of voltage surges previously determined during the starting process as a function of corresponding mean values of battery and engine temperatures, wherein said determined voltage surge is compared to a characteristic voltage value previously determined as a function of a battery temperature and an engine temperature corresponding to said stored battery temperature and engine temperature;(d) finding a deviation of the determined voltage surge from said characteristic voltage surge in the characteristic line field;(e) triggering an indicator or alarm function when the deviation exceeds a preassigned value.