Exhaust Gas Recirculation System for Internal Combustion Engine

• US 20160186701A1
• Filed: 06/26/2013
• Published: 06/30/2016
• Est. Priority Date: 06/26/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: ARIIZUMI, Yoshiki, AOYAGI, Yusuke
• Granted Patent: US 10,006,414 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02B 37/00 Engines characterised by provision of pumps driven at least for part of the time by exhaust
• CPC Class Codes: F02B 37/16 by bypassing charging air
• CPC Class Codes: F02B 39/16 Other safety measures for, or other control of, pumps
• CPC Class Codes: F02M 26/06 Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
• CPC Class Codes: 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
• CPC Class Codes: F02M 26/17 in relation to the intake system
• CPC Class Codes: F02M 26/34 with compressors, turbines or the like in the recirculation passage
• CPC Class Codes: F02M 26/35 with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

In accordance with the present invention, condensed water generated upstream of a compressor can be caused to flow into a groove 44, and temporarily accumulated therein. The condensed water flowing into the groove 44 moves to a lower portion in a gravity direction (that is, to an ABV 38-side) in the groove 44. When the ABV38 is opened, the condensed water accumulated in the groove 44 is blown away to a center portion of an inlet 46 on a flow of a return gas, and, together with an intake gas flowing through the center portion, the condensed water flows into a compressor 20 from a center portion 42b of a front end surface of an impeller 42. Since the center portion 42b has a lower circumferential speed than that of an outer peripheral portion 42a, occurrence of erosion by contact with the condensed water can be suppressed as compared to the outer peripheral portion 42a.

Claims

1. An exhaust gas recirculation system for an internal combustion engine, the exhaust gas recirculation system comprising:

an exhaust gas recirculation passage that connects an intake passage and an exhaust passage of the internal combustion engine;

a compressor provided downstream of a connection portion of the intake passage with the exhaust gas recirculation passage, and the compressor accommodating an impeller;

a storage portion provided on an inner wall of the intake passage between the connection portion and the impeller, and the storage portion being configured to store condensed water generated upstream of the compressor; and

a bypass passage that communicates with the storage portion, and the bypass passage bypasses the impeller to return an intake gas from a downstream side to an upstream side of the impeller.

2. The exhaust gas recirculation system according to claim 1,

wherein a connection portion of the bypass passage with the storage portion is provided below a center of a rotating shaft of the impeller.

3. The exhaust gas recirculation system for an claim 1,

wherein the storage portion is provided at the compressor.

4. The exhaust gas recirculation system according to claim 1,

wherein the storage portion is an annular groove, and the storage portion surrounds the intake passage.