Method and arrangement for cooling an exhaust system
OwnerRobert Wassmurinventor
Life of this patent
Estimating the term…
Abstract
The present invention relates to an arrangement for cooling an exhaust system of a vehicle having an internal combustion engine. The arrangement includes a controller for detecting an elevated temperature condition of the exhaust system, such as a so called hot soak condition, as well as detecting a predetermined engine operating status, such as either of an engine shutdown, a stopped or an idling status. A secondary air injection system may then be actuated to inject ambient air into the exhaust system thereby cooling said exhaust system.
Claims10
An arrangement for cooling an exhaust system for an internal combustion engine, comprising:
- a secondary air injection system coupled to the exhaust system, said secondary air injection system comprising;
- a pump for introducing ambient air into the exhaust system via a supply channel;
- and
- a valve for selectively allowing said ambient air to be injected into the exhaust system;
- and
- a controller coupled to said engine and said secondary air injection system, said controller actuating said secondary air injection system to introduce ambient air into said exhaust system when an exhaust gas temperature is above a predetermined value and a predetermined engine condition is detected by said controller.
A method for cooling an exhaust system for an internal combustion engine, comprising:
- detecting an elevated temperature condition of the engine exhaust system;
- detecting an engine operating condition;
- and
- in response to said detected elevated temperature condition during said detected predetermined engine status, injecting air into the engine exhaust system.
Dependencies are inferred from the claim text.