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Exhaust Gas Recirculation

IP.com Disclosure Number: IPCOM000241846D
Publication Date: 2015-Jun-04
Document File: 4 page(s) / 71K

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The IP.com Prior Art Database

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Page 01 of 4

Your Ref: 542-14

Draft Date: 2015-05-25

1

Exhaust Gas Recirculation


Herein an EGR (Exhaust Gas Recirculation) mixer arrangement is discussed. Such mixer arrangements are known e.g. from the patent documents WO 2005/064254 A1 and


5 US 2005/0205070 A1.

EGR is a commonly known method of influencing the combustion in internal combustion engines and entails that a proportion of the total exhaust gas flow from the engine is returned as a supply of EGR gas to the intake side of the engine where it is mixed with the intake air

10 for charging the engine cylinders. When combustion occurs with a reduced oxygen content, due to EGR admixture, the combustion temperature is reduced. This makes it possible to reduce the quantity of nitrogen oxides (NOx) in the exhaust gas emissions discharged into the surrounding environment.

15 The EGR mixer arrangement should be capable of distributing the supply of EGR gas as uniformly as possible to all engine cylinders. A particular problem poses the uniform distribution of EGR gas in an air intake of a V-type engine, such as a V8 engine.

Fig. 1 illustrates an air intake 1 of a V8 engine. The air intake 1 comprises a flange pipe 2,

20 which has an air inlet end 3 and comprises a first branch 4, and a second branch 4', each branch 4, 4' leading to an intake manifold 6, 6'. An EGR mixer arrangement 8 is arranged at a first portion of the flange pipe 2 downstream of the air inlet end 3 and upstream of the first branch 4. A portion of the flange pipe 2 is removed in Fig. 1 to clearly show the EGR mixer arrangement 8. The EGR mixer arrangement 8 comprises an EGR nozzle 10 extending into

25 the flange pipe 2. A conduit 11 of the EGR mixer arrangement is connected to the EGR nozzle 10 and configured for leading EGR gas to the EGR nozzle 10.

Fig. 2 illustrates the EGR nozzle 10 in more detail. The EGR nozzle 10 has an opening 12 directed in a downstream direction of the flange pipe 2 and a curved wall portion 14 facing in

30 an upstream direction of the flange pipe 2. A similarly shaped EGR nozzle is discussed in

WO 2007/064254 A1. By utilising an EGR mixer arrangement 8 comprising an EGR nozzle 10 as dis...