Restart control system

A restart control system applied to a vehicle including an internal-combustion engine, a rotating electrical machine capable of performing power generation using torque transmitted from an output shaft of the internal-combustion engine and providing a rotation torque to the output shaft, a starter motor configured to start the internal-combustion engine, a rotational speed detection unit configured to detect a rotational speed of the internal-combustion engine, and an automatic stop restart control function for performing automatic stop and automatic restart of the internal-combustion engine, comprising:

• a rotational angle estimation unit configured to estimate a rotational angle of the rotating electrical machine in a state in which the rotational speed of the internal-combustion engine detected by the rotational speed detection unit is higher than an estimation threshold and configured not to estimate the rotational angle of the rotating electrical machine in a state in which the rotational speed of the internal-combustion engine is lower than the estimation threshold;
• a rotating electrical machine control unit configured to increase the rotational speed of the internal-combustion engine using the rotating electrical machine under a condition where a predetermined restart condition is satisfied and the rotational angle of the rotating electrical machine is estimated by the rotational angle estimation unit, thereby restarting the internal-combustion engine;
• and
• a starter motor control unit configured to start driving of the starter motor under a condition where the predetermined restart condition is satisfied and the rotational speed of the internal-combustion engine falls below a predetermined rotational speed set lower than the estimation threshold, thereby increasing the rotational speed of the internal-combustion engine to the estimation threshold.

A restart control system applied to a vehicle including an internal-combustion engine, a rotating electrical machine capable of performing power generation using torque transmitted from an output shaft of the internal-combustion engine and providing a rotation torque to the output shaft, a starter motor configured to start the internal-combustion engine, a rotational speed detection unit configured to detect a rotational speed of the internal-combustion engine, and an automatic stop restart control function for performing automatic stop and automatic restart of the internal-combustion engine, comprising:

• a rotational angle estimation unit configured to estimate a rotational angle of the rotating electrical machine and incapable of estimating the rotational angle of the rotating electrical machine in a state in which the rotational speed of the internal-combustion engine is lower than an estimation threshold;
• a rotating electrical machine control unit configured to increase the rotational speed of the internal-combustion engine using the rotating electrical machine under a condition where a predetermined restart condition is satisfied and the rotational angle of the rotating electrical machine is estimated by the rotational angle estimation unit, thereby restarting the internal-combustion engine;
• and
• a starter motor control unit configured to start driving of the starter motor under a condition where the predetermined restart condition is satisfied and the rotational speed of the internal-combustion engine falls below a predetermined rotational speed set lower than the estimation threshold, thereby increasing the rotational speed of the internal-combustion engine to the estimation threshold.