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SYSTEM FOR CONTROLLING AN AIR HANDLING SYSTEM INCLUDING A DUAL-STAGE VARIABLE GEOMETRY TURBOCHARGER

  • US 20130074492A1
  • Filed: 09/25/2011
  • Published: 03/28/2013
  • Est. Priority Date: 09/25/2011
  • Status: Active Grant
First Claim
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1. An air handling system for an internal combustion engine, comprising:

  • a dual stage turbocharger including a high-pressure turbine having an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet, and a low-pressure turbine having an exhaust gas inlet fluidly coupled to the exhaust gas outlet of the high-pressure turbine and an exhaust gas outlet fluidly coupled to ambient,a turbine bypass passageway having one end fluidly coupled to the exhaust gas inlet of the high-pressure turbine and an opposite end fluidly coupled to the exhaust gas outlet of the high-pressure turbine,a turbine bypass throttle disposed in-line with the turbine bypass passageway, the turbine bypass throttle controllable between fully closed and fully open positions to control a flow of exhaust gas through the turbine bypass passageway, anda control circuit including a memory having instructions stored therein that are executable by the control circuit to determine a turbine bypass control signal as a function of a target flow rate of exhaust gas through the turbine bypass throttle, a target temperature of the exhaust manifold and a target outlet temperature of the high pressure turbine, and to control a position of the turbine bypass throttle between the fully closed and fully open positions using the turbine bypass control signal to selectively divert exhaust gas flow from the exhaust manifold away from the exhaust gas inlet of the high-pressure turbine.

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