START CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To surely prevent a battery voltage from falling to less than a voltage lower limit while an engine is started even if the temperature of a battery for supplying a power to a starter motor for starting the engine is low. SOLUTION: When the battery temperature is less than a predetermined determination value α while the engine is started, the starter motor is actually driven with a trial cranking torque Tg to determined whether the crankshaft of the engine is rotated or not. When the crankshaft is not rotated, in consideration of a battery voltage reduction ratio [ΔVB/Δt], the trial cranking torque is gradually increased (steps ST1 to ST8). Consequently, the starter motor can be driven with a proper cranking torque matching the state of the engine. Also, even if the temperature of the battary is low, the battery voltage can be surely prevented from falling to less than the voltage lower limit. COPYRIGHT: (C)2008,JPO&INPIT