Exhaust gas cooler with bypass tube and exhaust gas recirculation valve
AssigneeHoneywell International Inc.
InventorsStewart William Leedham, Matthew Thomas Graham Stonehouse
Life of this patent
Estimating the term…
Abstract
An exhaust gas recirculation cooler (1) with a coolant chamber (14), a bypass tube (50) and means (70) to selectively direct exhaust gas through the coolant chamber (14) or bypass tube (50). The bypass tube (50) may be used to direct hot exhaust gases to the engine under low engine temperature/load operating conditions and during start up of the engine; the coolant chamber (14) may be used to cool very hot gases under high engine temperature/load conditions and direct the cooled gas to the engine. The bypass tube (50) is integrally formed with the coolant chamber, reducing space required for the cooler and making for easier installation.
Claims19
An exhaust gas cooler comprising:
- an exhaust gas inlet chamber communicating with an exhaust gas inlet,
- an exhaust gas outlet chamber communicating with an exhaust gas outlet,
- a coolant chamber arranged between said exhaust gas inlet chamber and said exhaust gas outlet chamber and having a coolant inlet and a coolant outlet communicating with the coolant chamber,
- a plurality of exhaust gas passages inside the coolant chamber and communicating with the exhaust gas inlet chamber and exhaust gas outlet chamber, and
- a means to attach a bypass passage outside the coolant chamber to communicate with the exhaust gas inlet chamber and exhaust gas outlet chamber.
An exhaust gas cooler as claimed in any preceding claim, wherein the coolant chamber is arranged axially parallel to the bypass passage when the bypass passage is attached.
An exhaust gas cooler as claimed in any preceding claim, wherein the means to attach a bypass passage has a bypass inlet which communicates with the exhaust gas inlet chamber, the bypass inlet being arranged substantially perpendicular to the direction of flow of exhaust gas through the exhaust gas inlet chamber to the coolant chamber.
An exhaust gas cooler as claimed in any preceding claim, wherein the means to attach a bypass passage has an outlet which communicates with the exhaust gas outlet chamber, the bypass outlet being arranged substantially perpendicular to the direction of flow of exhaust gas through the exhaust gas outlet chamber from the coolant chamber.
An exhaust gas cooler as claimed in any preceding claim, wherein the bypass passage is formed integrally with the exhaust gas inlet chamber and the exhaust gas outlet chamber.
An exhaust gas cooler as claimed in any preceding claim, wherein the coolant chamber is a tubular chamber.
An exhaust gas cooler as claimed in any preceding claim, wherein the exhaust gas passages are exhaust gas tubes.
An exhaust gas cooler as claimed in any preceding claim, wherein the bypass passage is a bypass tube.
Dependencies are inferred from the claim text.