Supercharger control device for an internal combustion engine

摘要

A supercharger control device for an internal combustion engine is preferably applied to a system having a first supercharger and a second supercharger. A switching supercharging pressure setting unit sets a switching supercharging pressure used in case of switching a mode for operating the first supercharger and the second supercharger, based on a difference between a target supercharging pressure and an actual supercharging pressure. When the actual supercharging pressure reaches the switching supercharging pressure, a switching control unit performs a control of switching the mode. Therefore, it becomes possible to appropriately prevent the overshoot of the supercharging pressure at the time of switching the mode.

主权项

1. A supercharger control device for an internal combustion engine having a first supercharger and a second supercharger, comprising:
an intake air amount detecting unit which detects an intake air amount; an operating unit which operates the engine with only the first supercharger in a single turbo mode and operates the engine with both the first supercharger and the second supercharger in a twin turbo mode; a target supercharging pressure determining unit which determines a target supercharging pressure based on a driving state of the engine; an actual supercharging pressure detecting unit which detects an actual supercharging pressure; a switching supercharging pressure setting unit which sets a basic switching supercharging pressure used for switching from the single turbo mode to the twin turbo mode based on the intake air amount; a switching supercharging pressure correcting unit which corrects the basic switching supercharging pressure to determine a corrected switching supercharging pressure based on a supercharging pressure difference between the target supercharging pressure and the actual supercharging pressure; and a switching control unit which controls the operating unit to switch an operation mode of the engine from the single turbo mode to the twin turbo mode when the actual supercharging pressure reaches the corrected switching supercharging pressure, wherein
the switching supercharging pressure correcting unit determines the corrected switching supercharging pressure to be a lower pressure when the supercharging pressure difference between the target supercharging pressure and the actual supercharging pressure is larger, andthe switching supercharging pressure correcting unit determines the corrected switching supercharging pressure to be a higher pressure when the supercharging pressure difference between the target supercharging pressure and the actual supercharging pressure is smaller.