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US 8,555,622 B2Granted
Exhaust gas post processing system
AssigneeHyundai Motor Company
InventorSangmin Lee
Life of this patent
Estimating the term…
Abstract
An exhaust gas post processing system may include an exhaust pipe in which an exhaust gas from an engine passes, a catalyst that may be disposed at the exhaust pipe so as to decrease a harmful material of the exhaust gas, and a water jacket that may be formed around an exhaust pipe that may be disposed at an upstream side of the catalyst of the exhaust pipe, wherein a coolant may be selectively supplied into the water jacket such that the water jacket cools down the exhaust gas passing the exhaust pipe and thus the catalyst does not be over heated.
Claims6
An exhaust gas post processing system, comprising:
- an exhaust pipe in which an exhaust gas from an engine passes;
- a catalyst that is disposed at the exhaust pipe so as to decrease a harmful material of the exhaust gas;
- and
- a water jacket that is formed around the exhaust pipe and is disposed at an upstream side of the catalyst;
- a supply line fluid-connected to an upper portion of the water jacket for supplying a coolant to the water jacket;
- a return line fluid-connected to a lower portion of the water jacket for exhausting the coolant;
- and
- a supply control valve and a return control valve disposed at the supply line and the return line respectively to control a flow of the coolant to or from the water jacket,
- wherein the coolant in the water jacket is drained by its own weight when the supply line valve is closed and the return line is opened, and air fills the water jacket to achieve an insulation effect such that a heating period for activating the catalyst is reduced.
6 more elements
Dependencies are inferred from the claim text.