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US 8,042,335 B2Granted
Intake air heating and exhaust cooling
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Thomas G. Leone
Life of this patent
Estimating the term…
Abstract
Intake air heating and exhaust cooling is provided by a double wall exhaust system serving as an exhaust-to-air heat exchanger, sourcing hot air to the intake manifold for intake stroke pumping benefit and cooling the exhaust system during high load operation by routing excess boost air through an interstitial space of the double wall.
Claims16
A method for an engine, comprising:
- during conditions when intake manifold pressure is less than ambient pressure, drawing fresh air through an interstitial space of a double wall exhaust system to heat the air, and then directing the heated air to an intake manifold;
- and
- during conditions when intake manifold pressure is greater than ambient pressure, drawing intake air from the intake manifold to and through the interstitial space to cool exhaust gas.
A system for an engine, comprising:
- a boost device;
- an intake manifold;
- an exhaust system having a double wall exterior defining an interstitial space;
- a conduit coupling the interstitial space to the intake manifold downstream of the boost device;
- a control valve within the conduit;
- and
- a controller configured to execute instructions to:
- during a first condition, open the control valve to draw fresh air heated from the exhaust system interstitial space into the intake manifold;
- during a second condition, open the control valve to draw intake air from the intake manifold into the interstitial space;
- and
- during a third condition, close the control valve.
8 more elements
A method for an engine, comprising:
- during a first condition when an intake manifold pressure is less than ambient pressure, drawing fresh air through an air cleaner, through a first check valve and through an interstitial space of a double wall exhaust system to heat the air, and then directing the heated air out of the interstitial space through a control valve and into an intake manifold;
- and
- during a second condition when the intake manifold pressure is greater than ambient pressure, drawing intake air from the intake manifold through the control valve, through the interstitial space to cool exhaust gas and directing the air through a second check valve out to atmosphere.
Dependencies are inferred from the claim text.