Patent ID: 8176735

Claim:
A control device for multi-stage turbochargers which are turbochargers of at least two or more stages provided in series at an engine and in which a high-pressure stage turbocharger is configured by a variable-capacity turbocharger equipped with a variable vane, comprising: detection means for detecting a boost pressure or an intake air amount of a turbocharger of a stage with a pressure lower than that of the variable-capacity turbocharger, wherein an opening degree of the variable vane is controlled on the basis of a detection value of the detection means; storage means for storing a stationary-state opening degree map in which the opening degree of the variable vane in a stationary state of the engine is recorded and a transient-state opening degree map in which the opening degree is set lower than that in the stationary-state opening degree map; wherein in the stationary state of the engine, the opening degree of the variable vane is controlled based on the stationary-state opening degree map, and in the transient state of the engine, when the detection value of the detection means exceeds a predetermined value, the opening degree of the variable vane is controlled based on the stationary-state opening degree map, and when the detection value is equal to or lower than the predetermined value, the opening degree of the variable vane is controlled based on the transient-state opening degree map.