초록 ▼

An air supply control system for an internal combustion engine includes a plurality of superchargers including a turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the turbosupercharger is disposed, and an intake air cutoff val

An air supply control system for an internal combustion engine includes a plurality of superchargers including a turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the turbosupercharger is disposed, and an intake air cutoff valve operative selectively to open and close an intake passage in which a blower of the turbosupercharger is disposed, wherein both the exhaust cutoff valve and the intake air cutoff valve are closed when intake air mass flow fed to the engine is to be relatively small and are open when the intake air mass flow is to be relatively large, the intake air cutoff valve is delayed to be open compared with the exhaust cutoff valve when the operating condition of the engine is changed into the situation in which the intake air mass flow is to be relatively large from the situation in which the intake air mass flow is to be relatively small, and the intake air cutoff valve is delayed to be closed compared with the exhaust cutoff valve when the operating condition of the engine is changed into the situation in which the intake air mass flow is to be relatively small from the situation in which the intake air mass flow is to be relatively large.

대표청구항 ▼

An air supply control system for an internal combustion engine comprising: a plurality of separated exhaust passages connected with the engine, a plurality of separated intake passages connected with the engine, a plurality of superchargers including at least a first supercharger and a second superc

An air supply control system for an internal combustion engine comprising: a plurality of separated exhaust passages connected with the engine, a plurality of separated intake passages connected with the engine, a plurality of superchargers including at least a first supercharger and a second supercharger constituted as a turbosupercharger having a turbine disposed in one of the separated exhaust passages and a blower connected through a shaft with the turbine and disposed in one of the separated intake passages, an exhaust cutoff valve operative selectively to be open and closed respectively for opening and closing the separated exhaust passage in which the turbine of said second supercharger is disposed, an intake air cutoff valve operative selectively to be open and closed respectively for opening and closing the separated intake passage in which the blower of said second supercharger is disposed, first actuating means for driving said exhaust cutoff valve to be open and closed selectively, second actuating means for driving said intake air cutoff valve to be open and closed selectively, engine operation detecting means for detecting operating conditions of the engine to produce a first detection output, actuator control means for controlling, in response to the first detection output form said engine operation detecting means, said first and second actuating means to close both said exhaust cutoff valve and said intake air cutoff valve so that said second supercharger is restrained from supercharging the engine when the first detection output shows a situation that intake air mass flow fed to the engine is relatively small and to open both said exhaust cutoff valve and said intake air cutoff valve so that both of said first and second superchargers work for supercharging the engine when the first detection output shows a situation that the intake air mass flow fed to the engine is relatively large, engine operation change detecting means for detecting, based on the first detection output from said engine operation detecting means, changes in operating condition of the engine between a situation wherein the intake air mass flow fed to the engine is relatively small and a situation wherein the intake air mass flow fed to the engine is relatively large and producing a second detection output, and valve operation setting means for controlling, in response to the second detection output from said engine operation change detecting means, said actuator control means so that the intake air cutoff valve opening point in time is delayed compared with the exhaust cutoff valve opening point in time when the second detection output shows that the operating condition of the engine is changed into the situation wherein the intake air mass flow fed to the engine is relatively large from the situation wherein the intake air mass flow fed to the engine is relatively small and said intake air cutoff valve closing point in time is delayed compared with said exhaust cutoff valve closing point in time when the second detection output shows the operating condition of the engine is changed into the situation wherein the intake air mass flow fed to the engine is relatively small from the situation wherein the intake air mass flow fed to the engine is relatively large, wherein: said actuator control means is operative to detect, based on the first detection output from said engine operation detecting means, one of predetermined operating areas provided on an operating characteristic map defined by coordinates of operating parameters of the engine in which an actual operating condition of the engine resides and to control said first and second actuating means in accordance with the detected operation area, and said operating characteristic map contains a first predetermined operating area used for controlling said intake air cutoff valve to be open from closed and a second predetermined operating area used for controlling said exhaust cutoff valve to be open from closed, said first predetermined operating area having larger intake air mass flow compared with said second predetermined operating area.