Remaining charge detection device for power storage unit

A control device for a hybrid vehicle including an engine which outputs a driving force for the hybrid vehicle, a motor which assists an output of the engine in accordance with a driving state of the hybrid vehicle, and a power storage unit which stores energy generated by the motor used as a generator and regenerative energy obtained by a regenerative operation of said motor when said hybrid vehicle is decelerating, said control device for a hybrid vehicle comprising:

• a remaining charge detection device for said power storage unit, including:
• a current detection unit which detects the current value of a charging current and a discharging current of said power storage unit;
• a voltage detection unit which detects the voltage value of a terminal voltage of said power storage unit;
• a current accumulation remaining charge calculation means which calculates the accumulation of the current value detected by said current detection unit to obtain an accumulated charging current and an accumulated discharging current and, based on said accumulated charging current and said accumulated discharging current, calculates a remaining charge of said power storage unit;
• a no-load state generation unit which creates a no-load state of said power storage unit by terminating the output assistance of said engine by said motor and the regenerative operation of said motor;
• a no-load state detection unit which detects the no-load state of said power storage unit;
• and
• a remaining charge for calibration calculation unit which calculates, according to the voltage value detected in the no-load state of said power storage unit, a remaining charge for calibration with respect to said remaining charge of said power storage unit.

A hybrid vehicle provided with a remaining charge detection device for a power storage unit including:

• a current detection unit which detects the current value of a charging current and a discharging current of a power storage unit;
• a voltage detection unit which detects the voltage value of a terminal voltage of said power storage unit;
• and
• a current accumulation remaining charge calculation means which accumulates the current value detected by said current detection unit to obtain an accumulated charging current and an accumulated discharging current and, based on said accumulated charging current and said accumulated discharging current, calculates a remaining charge of said power storage unit, said remaining charge detection device further comprising:
• a no-load state detection unit which detects a no-load state of said power storage unit;
• and
• a remaining charge for calibration calculation unit which calculates, according to the voltage value detected in the no-load state of said power storage unit, a remaining charge for calibration with respect to said remaining charge of said power storage unit.