US Patent 10480476 Starter system and method of control

A starter system includes a brushless electric starter motor and a battery power pack, the motor operatively connectable to an internal combustion engine of a powertrain. A power inverter converts direct current provided from the battery power pack to multi-phase alternating current to drive the motor. A pinion gear with one-way clutch is rotatably driven by the motor and movable between a disengaged position and an engaged position in which the pinion gear is meshingly engaged with a ring gear operatively connected to a crankshaft of the engine. A solenoid is operatively connected to the pinion gear. An electronic control system controls the motor to crank the engine using power provided from the battery power pack, and to separately command the solenoid to a disabled or an enabled state. A method of controlling the starter system controls the motor to crank the engine in a restart following an autostop.