Hybrid vehicle control unit and control method

摘要

With a hybrid vehicle driven at extremely low speeds only by power from the electric motor, when a state-of-charge of the battery becomes equal to or smaller than a predetermined level or when a rotational speed required on the air conditioner compressor is less than a desired rotational speed, power from the internal combustion engine is transmitted to the output shaft by engaging the first engaging and disengaging mechanism, starting the internal combustion engine by power from the electric motor, and thereafter, engaging the first engaging and disengaging mechanism or the second engaging and disengaging mechanism between a fully applied state and a fully released state.

主权项

1. A control unit for a hybrid vehicle having an internal combustion engine and an electric motor as drive sources, the hybrid vehicle including:
a transmission including: a first transmission mechanism in which mechanical power from an engine output shaft of the internal combustion engine and the electric motor is borne by a first input shaft that engages with the electric motor and any one of a plurality of change-speed gears is engaged via a first synchronizing unit so that the first input shaft is brought into engagement with driven wheels of the hybrid vehicle; a second transmission mechanism in which mechanical power from the engine output shaft is borne by a second input shaft and any of a plurality of change-speed gears is engaged via a second synchronizing unit so that the second input shaft is brought into engagement with the driven wheels; a first engaging and disengaging mechanism that is provided so as to correspond to the first transmission mechanism for engaging the engine output shaft with the first input shaft; and a second engaging and disengaging mechanism that is provided so as to correspond to the second transmission mechanism for engaging the engine output shaft with the second input shaft; and an air conditioner compressor that is connected to the first input shaft via an air conditioner clutch, wherein the control unit controls the transmission so that with the hybrid vehicle driven at extremely low speeds only by power from the electric motor, when a state-of-charge of a battery that supplies electric power to the electric motor becomes equal to or smaller than a first charged level or when a rotational speed required on the air conditioner compressor is less than a desired rotational speed, power from the internal combustion engine is transmitted to an output shaft to drive the hybrid vehicle with the internal combustion engine by engaging the first engaging and disengaging mechanism, starting the internal combustion engine by power from the electric motor, and thereafter, engaging the first engaging and disengaging mechanism or the second engaging and disengaging mechanism between a fully applied state and a fully released state.