FAILURE DETERMINATION DEVICE FOR HYBRID VEHICLE

摘要

In a hybrid vehicle that selects a series mode in which an engine drives a motor generator to generate electric power and a driving motor drives drive wheels, the series mode is suspended to temporarily stop fuel supply to the engine, and the motor generator forcedly drives the engine using electric power supplied from a driving battery to perform motoring, and failure determination of the O2 sensors is performed based on oxygen concentrations of an exhaust gas from the engine detected by a front O2 sensor and a rear O2 sensor when the fuel supply to the engine is stopped and when the fuel supply is restarted after finish of the motoring.

主权项

1. A failure determination device for a hybrid vehicle, comprising:
an engine provided in a vehicle; a detection unit that detects an exhaust constituent of the engine; a motor generator that is driven by the engine to generate electric power, and drives the engine using electric power supplied from a driving battery included in the vehicle; a driving motor that drives drive wheels using electric power supplied from the driving battery; a mode selection unit that selects a first travel mode in which the engine drives the motor generator to generate electric power and the driving motor drives the drive wheels to cause the vehicle to travel; a motoring performing unit that suspends the first travel mode to temporarily stop fuel supply to the engine and forcedly drives the engine using the motor generator to perform motoring; and a unit for failure determination in travel mode that determines a failure of the detection unit based on a detection value of the detection unit when the fuel supply to the engine is stopped and a detection value of the detection unit when the fuel supply is restarted after finish of the motoring.