DISCHARGE ABILITY ESTIMATING SYSTEM, CONTROL SYSTEM IN VEHICLE INCORPORATING DISCHARGE ABILITY ESTIMATING SYSTEM, AND DISCHARGE ABILITY ESTIMATING METHOD

摘要

PROBLEM TO BE SOLVED: To a discharge ability estimating system for estimating a discharge ability of a battery without directly measuring or estimating an internal resistance or a maximum discharge current amount of the battery.SOLUTION: This engine ECU 40 estimates the discharge ability of the battery 21 that supplies power to a motor 23 which rotates a crankshaft 19 of the engine E to start the engine E. The engine ECU 40 estimates the discharge ability of the battery 21, based on an angular acceleration state of the crankshaft 19 in a rotation start period of the crankshaft 19.