Internal combustion engine with exhaust-gas turbocharging and exhaust-gas recirculation

Patent metadata

Field	Value
Publication number	US-2016108802-A1
Application number	US-201514872461-A
Country	US
Kind code	A1
Filing date	Oct 1, 2015
Priority date	Oct 15, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

Methods and systems are provided for a compressor bypass passage. In one example, a method may include flowing bypassed charge air through an annular passage into an intake passage.

First claim

1 . A method, comprising:
bypassing charge air to an intake system via a compressor bypass drawing charge air from each of upstream and downstream of a compressor impeller, where the compressor bypass introduces the bypassed charge air at an angle acute to an inner wall of an intake passage via an annular outlet.

2 . The method of claim 1 , further comprising flowing the bypassed charge air near the inner wall and transferring heat between the bypassed charge air and the inner wall.

3 . The method of claim 1 , wherein bypassing charge air includes drawing charge air from upstream of a compressor impeller and downstream of the compressor impeller.

4 . The method of claim 1 , wherein the bypassed charge air bypasses a portion of uncompressed charge air and compressed charge air.

5 . The method of claim 1 , further comprising a compressor bypass valve located in the compressor bypass, wherein charge air is not bypassed through the compressor bypass with a compressor bypass in a closed position.

6 . The method of claim 5 , wherein the compressor bypass valve is opened in response to a condensate risk being greater than a threshold.

7 . The method of claim 6 , wherein the condensate risk is based on a low-pressure exhaust gas recirculation flow, engine temperature, intake air temperature, intake air humidity, and weather conditions.

8 . The method of claim 1 , wherein the bypass charge air flows between a low-pressure exhaust gas circulation passage and the compressor.

9 . A system, comprising:
a compressor bypass located between a compressor and a low-pressure EGR passage; a first junction located upstream of a compressor impeller; a second junction located downstream of the first junction and the compressor impeller; a bypass passage in fluid communication with the first junction and the second junction, wherein a control valve in the bypass passage is located upstream of the first junction; and an annular passage in fluid communication with the bypass passage and an intake passage, wherein the annular passage directs bypassed charge air into the intake passage in a circular direction adjacent an inner wall of the intake passage toward the compressor.

10 . The system of claim 9 , wherein the annular passage comprises a single circular opening to the intake passage.

11 . The system of claim 10 , wherein the circular opening is oblique to the inner wall of the intake passage, where an angle between the inner wall and a direction of bypassed charge air flow is acute.

12 . The system of claim 9 , wherein the first junction directs uncompressed charge air to the bypass passage and the second junction directs compressed charge air to the bypass passage.

13 . The system of claim 9 , wherein the bypassed charge air is greater in pressure and temperature than charge air in the intake passage.

14 . The system of claim 9 , wherein the bypassed charge air flows toward the compressor impeller.

15 . The system of claim 9 , wherein the bypassed charge air flows between the inner wall and the charge air.

16 . A system, comprising:
an annular bypass passage directing bypassed charge air from a compressor to an intake passage, and where an angular direction of the bypassed charge air is acute to an inner wall of the intake passage and the bypassed charge air flows adjacent to the inner wall to form a barrier between the inner wall and charge air of the intake passage.

17 . The system of claim 16 , wherein bypassed charge air is drawn from at least upstream of a compressor impeller and downstream of the compressor impeller within a compressor housing.

18 . The system of claim 16 , wherein the angular direction is between 15 and 65 degrees.

19 . The system of claim 16 , wherein the bypassed charge air is greater in pressure than charge air within the intake passage.

20 . The system of claim 16 , wherein the bypassed charge air is directed to a compressor bypass located outside the intake passage before being directed to the annular bypass passage.

Assignees

• Ford Global Tech Llc

Inventors

• Smiljanovski Vanco
• Kindl Helmut Matthias
• Kemmerling Joerg
• Kuske Andreas
• Sommerhoff Franz Arnd

Classifications

• F02M26/09

  Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine · CPC title

• F02B39/16

  Other safety measures for, or other control of, pumps · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F04D29/685

  Inducing localised fluid recirculation in the stator-rotor interface · CPC title

• F04D29/684

  by fluid injection · CPC title