Internal combustion engine with supercharger controller and exhaust choke valve controller

摘要

An internal combustion engine is provided with an exhaust turbocharger 10, a catalytic converter 7 and an exhaust choke valve 8. The catalytic converter 7 is heated rapidly to a target temperature by controlling the opening of the exhaust choke valve 8, and a high boost pressure is ensured to improve the operating performance of the internal combustion engine. A supercharger controller C2 controls the vane position of variable vanes 13 included in the exhaust turbocharger 10 on the basis of pressure difference between a target boost pressure Po and an actual boost pressure P. A exhaust choke valve controller C3 includes a temperature-regulating opening setting unit 51 which sets a temperature-regulating opening Dt for the exhaust choke valve 8 on the basis of the temperature difference AT between the actual temperature T and a target temperature To at which the catalytic converter 7 is activated. The exhaust choke valve controller C3 adjusts the opening of the exhaust choke valve 8 to a temperature-regulating opening Dt greater than a reference opening for the exhaust choke valve 8 to raise the temperature of the catalytic converter 7 when the actual temperature T is lower than the target temperature To and the variable vanes 13 are not at a minimum vane position for increasing the boost pressure.