Hybrid vehicle control device

A hybrid vehicle control system of a hybrid vehicle including an internal combustion engine, an electric motor, an inverter for controlling the motor, a clutch for selectively connecting and disconnecting power transmission between the internal combustion engine and the electric motor, and a battery for supplying electric power to the motor, the hybrid vehicle control system comprising:

• a voltage detection unit that detects a voltage of the battery;
• a voltage control unit that controls the voltage of the battery within a range of previously set limit voltage and calculates a currently available first power value of the battery based on the voltage of battery detected by the voltage detection unit;
• a power control unit that calculates a second power value available stably from a current timing for a predetermined time based on battery conditions of the battery and, in accordance with calculation results, controls the output of the battery in accordance with the second power value;
• an internal combustion engine starting unit that engages the clutch and starts the internal combustion engine by controlling the inverter based on the voltage of the battery that is controlled by the voltage control unit;
• and
• a rotation speed setting unit that sets a rotation speed of the electric motor to start the internal combustion engine, and being configured, when starting the internal combustion engine, to lower the rotation speed when the first power value is lower than a power value necessary to start the internal combustion engine so that the first power value will be higher than the power value necessary to start the internal combustion engine, while the power control unit is prohibited from controlling the output of the battery in accordance with the second power value.