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US 12,158,121 B2Granted
Engine system configured for unburned hydrocarbon (HC) collection from exhaust port
AssigneeCaterpillar Inc.
InventorAndrew Joseph Loetz
Life of this patent
Estimating the term…
Abstract
An engine system includes a cylinder block, and a cylinder head attached to the cylinder block and including exhaust ports. Exhaust collection passages are formed in the cylinder head and each fluidly connect to one of the exhaust ports. An unburned hydrocarbon (UHC) emissions mitigation conduit fluidly connects to the exhaust ports to route UHC to an oxidation catalyst or for recirculation.
Claims15
An engine system comprising:
- an engine including a cylinder block having a plurality of cylinders formed therein, a cylinder head attached to the cylinder block and including a plurality of intake ports and a plurality of exhaust ports, and an intake manifold and an exhaust manifold each attached to the cylinder block;
- the cylinder head further having formed therein a plurality of exhaust collection passages each fluidly connected to one of the plurality of exhaust ports at an unburned hydrocarbon (UHC) collection location;
- an engine exhaust conduit fluidly connected to the exhaust manifold;
- and
- a UHC emissions mitigation conduit fluidly connected to the plurality of exhaust collection passages;
- each of the plurality of exhaust ports extending from an exhaust valve seat in the cylinder head, to an exhaust manifold feed opening, and each UHC collection location being fluidly between the respective exhaust valve seat and exhaust manifold feed opening.
3 more elements
A cylinder head for an engine comprising:
- a cylinder head casting having formed therein a coolant cavity extending between an upper deck having an upper deck surface, and a lower deck having a lower deck surface;
- the cylinder head casting further including an intake port extending through the coolant cavity to an intake opening in the lower deck forming an intake valve seat, and an exhaust port extending through the coolant cavity from an exhaust opening in the lower deck forming an exhaust valve seat to an exhaust manifold feed opening;
- and
- the cylinder head casting further having formed therein an exhaust collection passage fluidly connected to the exhaust port at an unburned hydrocarbon (UHC) collection location vertically between the upper deck and the lower deck, and fluidly between the respective exhaust valve seat and manifold feed opening.
1 more element
An engine system comprising:
- an engine including a cylinder block having a plurality of cylinders formed therein, a cylinder head attached to the cylinder block and including a plurality of intake ports and a plurality of exhaust ports, and an intake manifold and an exhaust manifold each attached to the cylinder block;
- the cylinder head further having formed therein a plurality of exhaust collection passages each fluidly connected to one of the plurality of exhaust ports at an unburned hydrocarbon (UHC) collection location;
- an engine exhaust conduit fluidly connected to the exhaust manifold;
- and
- a UHC emissions mitigation conduit fluidly connected to the plurality of exhaust collection passages;
- each of the plurality of exhaust collection passages including a plurality of exhaust collection inlets opening to the respective exhaust port;
- and
- each of the plurality of exhaust collection passages extending circumferentially around the respective exhaust port, and each respective plurality of exhaust collection inlets having a circumferential distribution around the respective exhaust port.
5 more elements
Dependencies are inferred from the claim text.