Patent ID: 9163574
Filing Date: 2015-10-20
Classification: F02D

Abstract:
1. A sensor characteristic correction device, comprising: characteristic detection means that detects a characteristic of a first sensor that is an air-fuel ratio sensor that is arranged upstream of a catalyst in an exhaust passage of an internal combustion engine, and a characteristic of a second sensor that is an air-fuel ratio sensor that is arranged downstream of the catalyst; calculation means that calculates a first air-fuel ratio based on the characteristic of the first sensor and calculates a second air-fuel ratio based on the characteristic of the second sensor; difference detection means that, when the catalyst is in an inactive state after start-up of the internal combustion engine, detects a difference between the first characteristic and the second characteristic or a difference between the first air-fuel ratio and the second air-fuel ratio; and correction means that, in accordance with the difference, corrects a responsiveness of the first sensor or the second sensor.