초록 ▼

An air supply control system for an internal combustion engine comprises at least first and second turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the second turbosupercharger is disposed, an intake air cutoff valve operativ

An air supply control system for an internal combustion engine comprises at least first and second turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the second turbosupercharger is disposed, an intake air cutoff valve operative selectively to open and close an intake passage in which a blower of the second turbosupercharger is disposed, a cutoff valve controller operative to control the exhaust cutoff valve and the intake air cutoff valve so as to cause the first turbosupercharger to work when intake air mass flow fed to the engine is to be relatively small and to cause both of the first and second turbosuperchargers to work when intake air mass flow fed to the engine is to be relatively large, an engine operation detector, and an operation controller operative to vary, in response to an engine operating condition detected by the engine operation detector, a boundary between first and second operating areas provided on an operating characteristic chart of the engine respectively for a first supercharging operation in which the first turbosupercharger works but the second turbosupercharger does not work and a second supercharging operation in which both of the first and second turbosuperchargers work.

대표청구항 ▼

An air supply control system for an internal combustion engine comprising: engine exhaust passages; engine intake passages; at least first and second turbosuperchargers each composed of a turbine disposed in one of exhaust passages of the engine and a blower connected through a shaft with the turbin

An air supply control system for an internal combustion engine comprising: engine exhaust passages; engine intake passages; at least first and second turbosuperchargers each composed of a turbine disposed in one of exhaust passages of the engine and a blower connected through a shaft with the turbine and disposed in one of intake passages of the engine, an exhaust cutoff valve operative selectively to be open and closed respectively for opening and closing the exhaust passage in which the turbine of said second turbosupercharger is disposed, an intake air cutoff valve operative selectively to be open and closed respectively for opening and closing the intake passages in which the blower of said second turbosupercharger is disposed, cutoff valve control means operative to cause both said exhaust cutoff valve and said intake air cutoff valve to be closed when intake air mass flow fed to the engine is detected to be within a first operating area in which the intake air mass flow is relatively small and to cause both said exhaust cutoff valve and said intake air cutoff valve to be open when intake air mass flow fed to the engine is detected to be in a second operating area in which the intake air mass flow is relatively large, so that said first turbosupercharger works for supercharging the engine when the intake air mass flow fed to the engine is relatively small and both of said first and second turbosuperchargers work simultaneously for supercharging the engine when the intake air mass flow fed to the engine is relatively large, memory means for storing said first and second operating areas, engine operation detecting means for detecting an operating condition of the engine, and operation control means for varying said first and second operating areas so that a boundary between said first and second operating areas can be varied in response to the operating condition detected by said engine operation detecting means.