Patent ID: 9140199
Filing Date: 2015-09-22
Classification: F01L,F02B,F02D,F02M,Y02T

Abstract:
1. A method for switching from a current combustion mode, which is either of a low-dilution combustion mode and a high-dilution combustion mode, to a target combustion mode, which is the other of the low-dilution and high-dilution combustion modes in an internal combustion engine having an intake passage with an exhaust-driven turbocharger, a crankshaft-driven positive displacement supercharger downstream of the turbocharger and having variable boost output controllable with a supercharger bypass valve, and a throttle valve downstream of the supercharger, the method comprising: determining the current combustion mode; determining current mass air flow; commanding a combustion mode switch to the target combustion mode when a current operating condition falls within a range of predetermined operating conditions; determining a target mass air flow amount to achieve a target air-fuel ratio corresponding to the current operating condition and the target combustion mode; controlling a degree of opening of both the supercharger bypass valve and the throttle valve to achieve the target mass air flow; and manipulating an amount of residual exhaust gas.