Control device for hybrid vehicle

摘要

A power-generation control unit controls the amount of power a generator can generate, when it is connected to an engine, by controlling a converter that converts AC power output by the generator to DC power. The power-generation control unit calculates a rotational-speed command value ωc_ref1 for the generator on the basis of a differential voltage value ΔVdc between a DC-voltage command value Vdc_ref for a power storage device and a DC voltage Vdc of a DC link portion; and executes a PWM control on an output of the converter on the basis of this rotational-speed command value ωc_ref1 such that the rotational speed ωc of the generator follows the rotational-speed command value ωc_ref1 and also such that the DC voltage Vdc follows the DC-voltage command value Vdc_ref so as to prevent overvoltage.

主权项

1. A control device for use in a hybrid vehicle that is applied to a hybrid vehicle that includes
a generator that is driven by an engine, a converter that converts AC power output by the generator to DC power, a power storage device that is electrically connected to the converter, and a load device that is driven by using at least one of electric power output by the converter and electric power from the power storage device and that performs a regenerative operation, the control device for use in a hybrid vehicle comprising: a power-generation control unit that controls, by controlling the converter, an amount of power generated by the generator; an upper-level control unit that controls at least an operation of the power-generation control unit, wherein the power-generation control unit includes an overvoltage prevention unit that
calculates a rotational-speed command value for the generator by using information on a differential voltage value between a DC-voltage command value that is set within a range, where it does not exceed an overvoltage threshold value that is equal to or lower than a fully-charged voltage value, for an electrical connection end of the power storage device and a DC voltage of the electrical connection end, and thatexecutes a PWM control on an output of the converter, by setting the differential voltage value as the rotational-speed command value when the DC voltage becomes equal to or higher than the overvoltage threshold value, such that a rotational speed of the generator follows the rotational-speed command value and therefore the DC voltage follows the DC-voltage command value, and when the DC voltage becomes equal to or higher than the overvoltage threshold value during a regenerative operation in the load device and when a rotational speed of the generator becomes equal to or higher than an idling rotating speed, the upper-level control unit outputs an engine torque command that is equal to zero in order to prompt the engine to operate an engine brake.