Engine gas temperature reduction
AssigneeInternational Truck Intellectual Property Company, LLC
InventorsJames C. Bradley, Anthony J. Cook
Life of this patent
Estimating the term…
Abstract
An exhaust system for a motor vehicle engine includes mixing vent flaps in the exhaust pipe which open responsive to exhaust temperature. The vent flap forms a portion of the exhaust pipe when closed and is pivotally attached along one edge to the exhaust pipe to open inwardly into the exhaust pipe to constrict and accelerate flow in the pipe to allow outside air to be drawn into the exhaust pipe. A magnetic catch latches the vent flap in its closed position and a magnetic release responsive to increased temperature of the exhaust stream releases the vent flap.
Claims8
An exhaust system for a motor vehicle engine comprising:
- an exhaust pipe;
- a vent flap forming a portion of the exhaust pipe when closed, the vent flap being pivotally attached along one edge to the exhaust pipe to open inwardly into the exhaust pipe to constrict and accelerate exhaust gas flow to draw outside air into the exhaust pipe through an opening the exhaust pipe left by movement of the vent flap;
- the position of the vent flap being responsive to exhaust gas temperature to open in response to the exhaust gas temperature reaching a preselected critical temperature;
- the vent flap including a permanent magnet;
- an anchor magnet positioned to repel the permanent magnet of the vent flap to urge the vent flap into a closed position;
- and
- a layer of material of high magnetic susceptibility between the anchor magnet and the permanent magnet of the vent flap with a curie point selected to match the preselected critical temperature.
An exhaust pipe comprising:
- a vent flap incorporated into the exhaust pipe;
- a magnetic catch for retaining the vent flap in a closed position;
- a magnetic release responsive to an elevated exhaust temperature for releasing the vent flap from its closed position;
- and
- the vent flap forming, upon opening, a venturi nozzle in the exhaust pipe.
Dependencies are inferred from the claim text.