# US 5,327,725 A · Exhaust gas recirculation system for a turbocharged engine

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- Number: US 5,327,725 A
- Document ID: US5327725A
- Status: Granted
- Kind: A
- Application number: 08/106,654
- Filed: 1993-08-16
- Granted: 1994-07-12
- Earliest claimed: 1992-08-24
- Assignees: Ishikawajima-Harima Jukogyo Kabushiki Kaisha
- Inventors: Ken Mitsubori
- Web page: https://patentgrep.com/patent/US5327725A

## CPC

- F04D 25/024: {the driving means being assisted by a power recovery turbine}
- F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
- F02M 26/09: Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
- F02M 26/17: in relation to the intake system
- F02M 26/30: Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
- F02M 26/32: Liquid-cooled heat exchangers
- F02M 26/39: with two or more EGR valves disposed in series
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

Resonance of a compressor impeller is prevented even when there are any pulsations in exhaust gas from an engine. An annular chamber in a diffuser defining wall of the compressor is connected with an outlet of a circulation passage for leading part of exhaust gas. An inner periphery of the chamber is communicated with the diffuser through an annular slit.

## Claims

### Claim 1

In an exhaust gas recirculation system wherein a turbocharger with a turbine and a compressor integrated with each other is mounted on an engine, part of the exhaust gas from the engine being joined back through a circulation passage to a suction system where air from the compressor is supplied to the engine, an improvement comprising an annular chamber in a diffuser defining wall of said compressor, said chamber being connected with an outlet of said circulation passage, and an annular slit on said diffuser defining wall for communicating an inner periphery of said chamber with the diffuser.

### Claim 2 (depends on 1)

The system according to claim 1 wherein a water-cooled jacket is mounted on an outer surface of the diffuser defining wall.