Electric system for automobile, control method for starting motor, and battery isolator in such electric system

摘要

An electric system for a motor vehicle and method for control of a starter motor (10) and a battery isolator (11) in such an electrical system. A consumer battery set and a starting battery set (6) are connected in parallel. The battery isolator is switchable between an off position in which the starting battery set is electrically disconnected from the starter motor, and an on position in which the starting battery set is electrically connected to the starter motor. An electronic control device (12), upon receiving a starting signal, causes the battery isolator to assume the on position, and thereafter causes the starter motor to start, in order thereby to ensure that the battery isolator is in the on position before the starter motor is started. For switching off the starter motor, the battery isolator is only allowed to be switched from on position to off position after the starter motor has been switched off, in order thereby to ensure that the starter motor is switched off before the battery isolator is caused to adopt the off position.