EGR Mixer Utilizing a Helix
Publication Date: 2017-Jun-07
The IP.com Prior Art Database
Title: EGR Mixer Utilizing a Helix
Background: Many diesel, gasoline, and natural gas engines today utilize Exhaust Gas Recirculation (EGR) to aide in
the control of in‐cylinder combustion temperatures, in‐cylinder NOx formation, and total engine fluid economy. In an air system where EGR is utilized the EGR gases join fresh air in an engine function referred to as EGR mixing. The way by which EGR mixing occurs can lead to improved homogeneity of the air and EGR mixture. Other intentional or unintentional changes caused by EGR mixing include air stream disturbances, regions of varying temperature, and regions of non‐linear air system restriction.
As shown in the attached illustration and described below, an exhaust gas recirculation (EGR) mixer that utilizes a helix arrangement in the mixing chamber, is disclosed.
This document describes an engine air system comprising an EGR mixer with helix (as shown in Figure 1). An engine air system will typically also include an EGR pipe (also shown in Figure 1), fresh air pipe (also shown in Figure 1), intake air plenum (not shown), cylinder head (not shown), and engine cylinder (not shown). The cylinder head plenum can be removable or permanently affixed with the cylinder head. The EGR mixer can be a single part or assembly of parts. The EGR mixer may also be integrated into other component designs such as the intake plenum, inlet pipe, or EGR piping.
The purpose of the EGR helical volute is to ...