When a detected value for detecting a rich imbalance in air-fuel ratio among cylinders, in a state where an intake air amount of an engine falls within a low amount region, is lower than a first threshold corresponding to the intake air amount and is higher than or equal to a second threshold corresponding to the intake air amount, a hybrid electronic control unit controls the engine such that the intake air amount falls within a high amount region, and controls a motor generator such that electric power corresponding to a power increase amount is consumed. When the intake air amount falls within the high amount region, the hybrid electronic control unit detects a rich imbalance in air-fuel ratio among the cylinders by comparing the detected value with a third threshold corresponding to the intake air amount.
Air-fuel ratio imbalance detecting device and air-fuel ratio imbalance detecting method for internal combustion engine of vehicle
2015-12-29
Patent
Electronic Resource
English
European Patent Office | 2016
|Air-fuel ratio imbalance determination apparatus and air-fuel ratio imbalance determination method
European Patent Office | 2016
|Diagnostics of Individual Air Fuel Ratio Cylinder Imbalance
SAE Technical Papers | 2017
|Diagnostics of Individual Air Fuel Ratio Cylinder Imbalance
British Library Conference Proceedings | 2017
|