Patent ID: 9109520
Filing Date: 2015-08-18
Classification: B60W,F01L,F02D,Y02T

Abstract:
1. A control apparatus for an internal combustion engine, comprising: a valve stop mechanism that is capable of switching an operational state of an intake valve between a valve operating state and a valve closed/stopped state; a crank angle sensor for detecting a crank angle of an internal combustion engine; an intake pressure sensor for detecting an actual intake pressure at an integral part of an intake passage that leads to a plurality of cylinders equipped with the internal combustion engine; and a controller that is configured to: determine whether or not there is the failure concerning the switching of the operational state of the intake valve between the valve operating state and the valve closed/stopped state by the valve stop mechanism, based on a first difference between a difference of the actual intake pressure at a predetermined crank angle period and a difference of the pseudo intake pressure at the predetermined crank angle period; discriminate a determination target cylinder that is subjected to failure determination, on a basis of the crank angle that is detected by the crank angle sensor; and determine that a failure concerning a returning operation of the intake valve for switching the valve closed/stopped state to the valve operating state has occurred at the determination target cylinder, when a second difference that is obtained by subtracting the actual intake pressure at the predetermined crank angle associated with the determination target cylinder from the atmospheric air pressure is smaller than a predetermined first determination value, and the first difference that is obtained by subtracting the difference of the actual intake pressure at the predetermined crank angle period associated with the determination target cylinder from the difference of the pseudo intake pressure at the predetermined crank angle period is smaller than a predetermined second determination value, in a case in which a returning request to switch the valve closed/stopped state to the valve operating state for the intake valve is present.