System for supercharging the intake gases and for recirculating the exhaust gases of an engine and associated control method

Patent metadata

Field	Value
Publication number	US-2016003134-A1
Application number	US-201414766647-A
Country	US
Kind code	A1
Filing date	Feb 4, 2014
Priority date	Feb 7, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

The invention concerns a system ( 3 ) for supercharging the intake gases and for recirculating the exhaust gases of an engine ( 1 ), comprising: a supercharging circuit ( 5 ) comprising a turbocharger ( 9 ) to be driven by the exhaust gases from at least a first cylinder ( 2 a, 2 b, 2 c ) of the engine ( 1 ); a recirculating circuit ( 7 ) for the exhaust gases from at least a second cylinder ( 2 d ); and an exhaust gas-orienting device ( 25 ) winch is connected to the two circuits ( 5 and 7 ) and is intended to be connected to an exhaust line ( 23 ) of the engine ( 1 ) so as to control an amount of exhaust gas placed in communication between the supercharging circuit ( 5 ), the recirculating circuit ( 7 ) and the exhaust line ( 23 ) of the engine ( 1 ).

First claim

1 . A system for supercharging the intake gases and recirculating the exhaust gases of an engine, said system comprising:
a supercharging circuit comprising a turbocharger to be driven by the exhaust gases from at least a first cylinder of the engine; a recirculating circuit for the exhaust gases from at least one second cylinder; and an exhaust gas-orienting device that is connected to the two circuits and is able to be connected to an exhaust line of the engine so as to control an amount of exhaust gas placed into communication between the supercharging circuit, the recirculating circuit and the exhaust line of the engine.

2 . The system according to claim 1 , wherein the gas-orienting circuit is connected to the supercharging circuit at a discharge duct of the turbocharger.

3 . The system according to claim 1 , wherein the exhaust gas-orienting device comprises:
an exhaust gas recirculation valve comprising: a body defining a primary duct designed to be connected to both the outlet of the at least one second cylinder, and to a gas recirculation duct, an auxiliary duct emerging in said primary duct, and means for orienting exhaust gases toward the outlet of the primary duct designed to be connected to said gas recirculation duct and/or toward the auxiliary duct; a discharge valve comprising a cavity having a first opening designed to be connected to a duct connected to the outlet of the first cylinder, a second opening designed to be connected to the exhaust line, and a third opening connected to the auxiliary duct of the recirculation valve, the discharge valve also comprising first and second means for closing off said first and second openings, respectively, to control the placement in communication of the auxiliary duct with the duct connected to the first and second openings.

4 . The system according to claim 3 , wherein the exhaust gas-orienting means of the recirculation valve comprise a shutter movable between a full recirculation position preventing the communication between the primary duct and the auxiliary duct and a second position closing off the primary duct, allowing the placement in communication of the primary duct and the auxiliary duct.

5 . The system according to claim 1 , also comprising an air cooler designed to be situated upstream from the intake of the cylinders of the engine and situated downstream from an intake of the gas recirculating circuit, said cooler being configured to cool and mix the gases received at the inlet to transmit the cold and mixed gases toward the cylinders of the engine.

6 . A method for controlling a system according to claim 3 , the method comprising:
steering the exhaust gas-orienting device to control an amount of gas placed in communication between the supercharging circuit, the recirculating circuit and the exhaust line of the engine.

7 . The control method according to claim 6 , wherein the exhaust gas-orienting device is steered based on the parameters of the engine.

8 . The control method according to claim 6 , wherein the steering of the gas-orienting device comprises the steering of the exhaust gas-orienting means of the recirculation valve and the steering of the first and second closing means of the discharge valve.

9 . The method according to claim 8 , further comprising orienting, by the orient means, the gases toward the primary duct, and the first closing means close the first opening of the discharge valve so as to isolate the supercharging and gas recirculating circuits relative to one another.

10 . The method according to claim 8 , further comprising orienting, by the orient means, the gases toward the primary duct wherein the closing means of the discharge valve are in the open position so as to isolate the supercharging and gas recirculating circuits relative to one another and allow a discharge of the gases driving the turbocharger toward the exhaust line.

11 . The method according to claim 8 , further comprising orienting, by the orient means, the gases toward the auxiliary duct wherein the second closing means of the discharge valve close the second opening so as to isolate the gas-orienting device of the exhaust line and place the gases from the second cylinder in communication with the gases driving the turbocharger, said turbocharger then being driven by the first and second cylinders.

12 . The method according to claim 8 , further comprising orienting, by the orient means, the gases toward the auxiliary duct, wherein the first closing means of the discharge valve close the first opening so as to isolate the recirculation and supercharging circuits and allow transmission of the gases from the second cylinder toward the exhaust.

13 . The method according to claim 8 , further comprising orienting, by the orient means, the gases from the second cylinder toward the primary duct, wherein the second closing means of the discharge valve close the second opening so as to isolate the orienting device from the exhaust line and to facilitate the maintenance in the full recirculation position of the exhaust gas-orienting means of the recirculation valve.

14 . The method according to claim 8 , further comprising orienting, by the orient means, the gases both toward the primary duct and toward the auxiliary duct, wherein the second closing means of the discharge valve close the second opening so as to isolate the orienting device from the exhaust line and place the gases from the second cylinder in communication with the gases driving the turbocharger.

Assignees

• Valeo Sys Controle Moteur Sas

Inventors

• Hodebourg Grégory
• Potteau Sébastien

Classifications

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F02B33/40

  of non-positive-displacement type · CPC title

• F02B29/08

  Modifying distribution valve timing for charging purposes (F02B29/06 takes precedence) · CPC title

• F02M26/43

  in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title