PURPOSE: To perform processing corresponding to battery trouble by recording and holding battery diagnosing data until the time of driving and generating a next engine start previous warning when the data meets specific battery diagnosing requirements.
CONSTITUTION: When a microcomputer 9 when powered on, said microcomputer measures the release voltage E0 of the battery 1 first. Then when an ignition switch 5 is turned on, the voltage E0 is updated. Then when the engine is started with a start switch 3 on, the battery voltage at the start and a discharging current by a current detector 6 are measured. The computer 9 inputs the voltage E0, battery terminal voltage, discharging current, etc., to computer the remaining electric discharging quantity of the engine after its stop, and also holds this data as battery diagnostic data even after the switch 5 is turned off. When this stored data meet specific battery diagnostic requirements, a warning is voiced through a speaker 12 right after the switch 5 is turned on next time and right before the engine restarts.
SAITO AKIHIRO
URAKAWA HARUNORI
ENDO TAKUYA
NISSAN MOTOR