Patent ID: 7677091
Filing Date: 2010-03-16
Classification: F02D

Abstract:
1. A diagnosis apparatus for intake sensors, comprising: an intake air amount sensor detecting an amount of intake air of an internal combustion engine; an intake pipe pressure sensor detecting an intake pipe pressure; an air-fuel ratio sensor detecting air-fuel ratio in an exhaust gas; and a computer for performing a diagnosis of the intake air amount sensor and/or the intake pipe pressure sensor, wherein the computer is configured to perform the diagnosis based on a first intake air amount representing an intake air amount detected by the intake air amount sensor, a second intake air amount representing an intake air amount calculated based on an intake pipe pressure detected by the intake pipe pressure sensor, and a third intake air amount representing an intake air amount calculated based on the air-fuel ratio and a fuel injection amount; the fuel injection amount is determined based on the first intake air amount, and the computer performs the diagnosis of the intake pipe pressure sensor by comparing the second intake air amount with the third intake air amount, and performs a diagnosis of the intake air amount sensor by comparing the first intake air amount with the second intake air amount when the intake pipe pressure sensor is determined as operating in a predetermined manner.