US 2014/0230772 A1Published application

Dual path sair for dual plane integrated exhaust manifolds

AssigneeGM Global Technology Operations LLC

InventorsAlan W. HAYMAN, Kenneth M. EASTMAN, Robert S. MCALPINE

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Abstract

A secondary air injection or SAIR system is illustrated and described which includes a first air injection path defined by in part by a lower ditch formed in the head mounting surface of the cylinder block, and a second air injection path defined in part by a second ditch formed in the block mounting surface. The cylinder head gasket is used to separate and seal the first ditch from the second ditch. The first and second air injection paths are separate and isolated from one another such that secondary air may be selectively introduced through the first air injection path into the first exhaust leg and selective introduced through the second injection path into the second exhaust leg independent of the first air injection path.

Claims20

Dependent claims

A secondary air injection system for an internal combustion engine of the type having a cylinder block with multiple cylinders, a cylinder head securely fastened to the cylinder block with a head gasket disposed between a head mounting surface formed on the cylinder block and a block mounting surface formed on the cylinder head, and an integrated exhaust manifold including a first exhaust leg having a first passageway formed therethrough to provide fluid communication from a first exhaust port formed in said cylinder head to a first exit port and a second exhaust leg having a second passageway formed therethrough to provide fluid communication from a second exhaust port formed in said cylinder head to a second exit port, the secondary air injection system comprising:

a first air injection path for selectively introducing air into the first exhaust leg, the first air injection path having a first supply passage providing fluid communication to a first ditch formed in the head mounting surface of the cylinder block and a first runner formed in the integrated exhaust manifold and providing fluid communication from the first ditch to the first exhaust leg;
and
a second air injection path for selectively introducing air into the second exhaust leg, the second air injection path having a second supply passage in fluid communication with a second ditch formed in the block mounting surface and a second runner formed in the integrated exhaust manifold and providing fluid communication from the second ditch to the second exhaust leg, the second ditch being isolated from the first ditch;
wherein secondary air is injected into the first exhaust leg independently from secondary air injected into the second exhaust leg.

1 more element

A multi-cylinder internal combustion engine comprising:

a cylinder block having at least a first cylinder and a second cylinder;
a cylinder head securely fastened to the cylinder block and having a first exhaust port formed therethrough and in fluid communication with the first cylinder and a second exhaust port formed therethrough and in fluid communication with the second cylinder;
a head gasket disposed between a head mounting surface formed on the cylinder block and a block mounting surface formed on the cylinder head
an exhaust manifold including a first exhaust leg having a first passageway formed therethrough to provide fluid communication from the first exhaust port to a first exit port and a second leg having a second passageway formed therethrough to provide fluid communication from the second exhaust port to a second exit port;
a first air injection path providing fluid communication from a first control valve through a first ditch formed in the head mounting surface of the cylinder block to the first exhaust leg;
and
a second air injection path providing fluid communication from a second control valve through a second ditch formed in the block mounting surface of the cylinder head to the second exhaust leg, the second ditch being sealed from the first ditch with the head gasket;
wherein secondary air is selectively and independently introduced through the first air injection path into the first exhaust leg and through the second injection path into the second exhaust leg.

5 more elements

An internal combustion engine comprising:

a cylinder block having four cylinders arranged in-line;
a cylinder head securely fastened to the cylinder block and at least one exhaust port formed therethrough for each of the four cylinders;
a head gasket disposed between a head mounting surface formed on the cylinder block and a block mounting surface formed on the cylinder head;
an exhaust manifold including an exhaust leg for each of the four cylinders, each exhaust leg having a passageway formed therethrough to provide fluid communication from the exhaust port to an exit port;
a first air injection path providing fluid communication from a first control valve through a first ditch formed in the head mounting surface of the cylinder block to a first pair of first exhaust legs;
and
a second air injection path providing fluid communication from a second control valve through a second ditch formed in the block mounting surface of the cylinder head to a second pair of exhaust legs, the second ditch being sealed from the first ditch with the head gasket;
wherein secondary air is selectively and independently introduced through the first air injection path into the first pair of exhaust legs and through the second injection path into the second pair of exhaust legs.

5 more elements

Dependencies are inferred from the claim text.