Patent ID: 7827790

Claim:
A controller for an internal combustion engine with a supercharger having a turbine wheel and a compressor impeller, the controller being applied to an internal combustion engine including a supercharger for supercharging intake air by exhaust power and a power assist device attached to the supercharger and directly assisting power of the supercharger, the controller controlling output torque of the internal combustion engine by adjusting an amount of air taken into the internal combustion engine by an airflow rate adjusting means, said controller comprising: target airflow rate calculating means that calculates a target airflow rate based on a target torque corresponding to a request of a driver; actual airflow rate calculating means that calculates an actual airflow rate actually flowing in an intake air path by estimation or measurement at a time of performing the airflow rate control by the airflow rate adjusting means; target pressure calculating means that calculates target boost pressure based on the target torque; target power calculating means that calculates target turbine power of the turbine wheel based on an airflow rate information representing at least target airflow rate and target boost pressure; actual power calculating means that calculates actual turbine power of the turbine wheel based on exhaust parameters representing at least exhaust flow rate, turbine upstream pressure, turbine downstream pressure, and turbine upstream temperature; assist amount calculating means that calculates an assist amount of the power assist device based on a power difference between the target turbine power and actual turbine power of the turbine wheel, the assist power amount corresponding to an insufficient amount of the actual turbine power relative to the target turbine power, the assist power amount being varied along with a variation in the power difference; and assist control means that controls the power assist device by the calculated assist amount in such a manner that when the assist power amount of the power assist device is lower than or equal to a predetermined value, the power assist device is stopped, wherein the above-referenced power parameters are rates of energy flow.