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COMBUSTION MODE SWITCHING WITH A TURBOCHARGED/SUPERCHARGED ENGINE

  • US 20130125544A1
  • Filed: 11/16/2012
  • Published: 05/23/2013
  • Est. Priority Date: 11/17/2011
  • Status: Active Grant
First Claim
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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 the degree of opening of both the supercharger bypass valve and the throttle valve to achieve the target mass air flow; and

    manipulating the amount of residual exhaust gas.

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