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US 2014/0190160 A1Published application
Method and system for exhaust gas recirculation
AssigneeFord Global Technologies, LLC
InventorsDaniel Joseph Styles, Brad Alan Boyer, Satheesh Makkapati
Life of this patent
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Abstract
Methods and systems are provided for an engine including a first turbocharger having a first compressor and a second turbocharger having a second compressor. An EGR differential between the first compressor and the second compressor may be increased under a condensation condition, and decreased under a surge condition. The EGR differential may also be decreased when a compressor outlet temperature exceeds an outlet temperature threshold.
Claims20
A method of operating a twin-turbocharger engine, comprising:
- increasing an EGR flow differential between EGR flow to a first compressor and to a second compressor via a cross-over valve responsive to an intake temperature that corresponds with condensation accumulation;
- and
- decreasing the EGR flow differential between EGR flow to the first and to the second compressor via the cross-over valve responsive to a surge condition.
A method of operating a cross-over valve of an engine, comprising:
- opening the cross-over valve if a manifold pressure exceeds a pressure threshold and an air flow is below an air flow threshold, the cross-over valve positioned in a low-pressure EGR cross-over loop fluidically coupling EGR upstream of a first and a second engine turbocharger compressor;
- closing the cross-over valve if the manifold pressure is below the pressure threshold or the air flow exceeds the air flow threshold;
- and
- adjusting engine operating parameters to compensate for the opening and closing of the cross-over valve generating changes in an EGR flow differential between EGR flow to the first compressor and to the second compressor.
1 more element
Dependencies are inferred from the claim text.