Patent ID: 9644549
Date: 2017-05-09
CPC Classifications: F02B,F02D,Y02T

Claim:
1. A control apparatus for an internal combustion engine provided with a turbocharger, the control apparatus switching operation of the internal combustion engine between a stoichiometric operation, in which fuel combustion occurs at a first air-fuel ratio, and a lean operation, in which fuel combustion occurs at a second air-fuel ratio leaner than the first air-fuel ratio, based on an operation region map that defines, in association with an engine torque, a stoichiometric region in which the stoichiometric operation occurs and a lean region separated from the stoichiometric region by a predetermined boundary in which the lean operation occurs, and on a target value of an engine torque, the control apparatus comprising: storage means configured to store a rule that defines a relationship between a turbocharging pressure and the engine torque; a control valve that opens and closes a bypass channel that bypasses an exhaust turbine of the turbocharger; turbocharging pressure detecting means configured to detect the turbocharging pressure of the turbocharger; and boundary correcting means configured to correct the predetermined boundary based on the engine torque calculated using the turbocharging pressure detected by the turbocharging pressure detecting means and the rule when a predetermined correction permission condition is satisfied that an operation region identified based on the target value calculated from an accelerator opening and the operation region map lies in the lean region, and the bypass channel is closed by the control valve.