Power output apparatus, vehicle equipped with power output apparatus, and control method of power output apparatus

摘要

A vehicle is equipped with a planetary gear mechanism including a sun gear, a carrier, and a ring gear that are respectively connected to a first motor, an engine, and a driveshaft. A second motor is further linked to the driveshaft. An air-fuel ratio sensor located in an exhaust system of the engine detects the air-fuel ratio while the engine is rotated in a fuel cut state. Normality or abnormality of the air-fuel ratio sensor is identified, based on a result of determination whether the detected air-fuel ratio is out of a specified normal range. When engine stop conditions for stopping the operation (rotation) of the engine are satisfied during execution of failure detection of the air-fuel ratio sensor (steps S 300 and S 310 ), the drive control of the invention maintains the rotation of the engine in the fuel cut state until completion of the failure detection of the air-fuel ratio sensor and controls the first motor to motor the engine (step S 330 ). The operation of the engine is stopped on completion of the failure detection (step S 320 ).