Patent ID: 9523331
Filing Date: 2016-12-20
CPC Classification: F02D,F02M,Y02T

Claim Text:
1. A control device for a turbocharged diesel engine of which a supercharging pressure is actively controllable through operation of an actuator, comprising: an engine control unit (ECU) for operating the actuator in accordance with a predetermined control program by processing signals from a plurality of sensors provided in the diesel engine, the ECU configured to: determine an actual supercharging pressure of the engine from a signal of a supercharging pressure sensor; determine a steady target value that is a target value of the supercharging pressure during steady operation on the basis of an engine rotation speed and a fuel injection amount; operate the actuator through feedback control such that the actual supercharging pressure follows the steady target value; when at least one condition of a plurality of different conditions is satisfied during transitional operation, the ECU is configured to calculate a transitional target value that is a target value of the supercharging pressure, suitable for the satisfied condition in accordance with a calculation rule prepared for each condition, wherein the plurality of conditions include a condition associated with an exhaust pressure and an exhaust pressure change rate, a condition associated with a supercharging pressure change rate, and the plurality of conditions further include a condition associated with a differential pressure between the exhaust pressure and the supercharging pressure, the engine control unit further configured to: determine a priority order among the plurality of conditions on the basis of a value of a rate of change of the fuel injection amount; select the transitional target value, and, when there are a plurality of conditions satisfied at the same time and a plurality of transitional target values, selecting one of the transitional target values in accordance with the determined priority order; and change a target value of the feedback control from the steady target value to the selected transitional target value determined by priority order to operate the actuator.