Controlling fresh air and exhaust gas flow in turbocharged internal combustion engine

Patent metadata

Field	Value
Publication number	US-9551302-B2
Application number	US-201313732586-A
Country	US
Kind code	B2
Filing date	Jan 2, 2013
Priority date	Jan 5, 2012
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

An internal combustion engine has a cylinder and an exhaust-gas turbocharger comprising a compressor arranged in an intake system and a turbine arranged in an exhaust-gas discharge system. Various lines are provided for conducting gases including 1) a bypass line branching off from the inlet system downstream of the compressor so as to form an inlet-side junction, and 2) a recirculation line branching off from the exhaust-gas discharge system upstream of the turbine so as to form an outlet-side junction which opens into the bypass line. A first control element at the outlet-side junction adjusts an exhaust-gas quantity conducted through the recirculation line. A second control element at the inlet-side junction has a first position that separates the bypass line from the cylinder and connects the intake line to the cylinder, and a second position that separates the intake line from the cylinder and connects the bypass line to the cylinder.

First claim

What is claimed is:

1. An internal combustion engine comprising:
at least one cylinder with an inlet side adapted to be coupled to an intake system and an outlet side adapted to be coupled to an exhaust-gas discharge system;
at least one exhaust line for discharging exhaust gases from the cylinder to the exhaust-gas discharge system;
at least one intake line for supplying charge air to the cylinder from the intake system;
at least one exhaust-gas turbocharger comprising a compressor arranged in the intake system and a turbine arranged in the exhaust-gas discharge system;
a bypass line for bypassing the cylinder, wherein the bypass line branches off from the intake system downstream of the compressor so as to form an inlet-side junction, and wherein the bypass line opens into the exhaust-gas discharge system downstream of the turbine;
a recirculation line which branches off from the exhaust-gas discharge system upstream of the turbine so as to form an outlet-side junction which opens into the bypass line;
a first control element at the outlet-side junction for adjusting an exhaust-gas quantity conducted through the recirculation line; and
a second control element at the inlet-side junction having a first position that separates the bypass line from the cylinder and connects the intake line to the cylinder, and having a second position that separates the intake line from the cylinder and connects the bypass line to the cylinder.

2. The internal combustion engine of claim 1 wherein the second control element can be adjusted into a third position in which the intake line and the bypass line are connected to one another and to the cylinder.

3. The internal combustion engine of claim 1 wherein a cooling device is provided in the recirculation line in order to cool the exhaust gas.

4. The internal combustion engine of claim 3 wherein the cooling device is comprised of a liquid cooling arrangement.

5. The internal combustion engine of claim 1 further comprising an exhaust-gas aftertreatment system in the exhaust-gas discharge system downstream of the turbine.

6. A method for operating a liquid-cooled internal combustion engine, wherein the engine includes at least one cylinder with an net side coupled to an intake system for receiving fresh air and an outlet side coupled to an exhaust-gas discharge system, at least one exhaust line for discharging exhaust gases from the cylinder to the exhaust-gas discharge system, at least one intake line for supplying charge air to the cylinder from the intake system, at least one exhaust-gas turbocharger comprising a compressor arranged in the intake system and a turbine arranged in the exhaust-gas discharge system, a bypass line for bypassing the cylinder wherein the bypass line branches off from the intake system downstream of the compressor so as to form an inlet-side junction and wherein the bypass line opens into the exhaust-gas discharge system downstream of the turbine, a recirculation line which branches off from the exhaust-gas discharge system upstream of the turbine so as to form an outlet-side junction which opens into the bypass line, a first control element at the outlet-side junction for adjusting an exhaust-gas quantity conducted through the recirculation line, a second control element at the inlet-side junction having a first position that separates the bypass line from the cylinder and connects the intake line to the cylinder and having a second position that separates the intake line from the cylinder and connects the bypass line to the cylinder, and a cooling device provided in the circulation line, and wherein the method comprises the steps of:
monitoring operating conditions of the internal combustion engine to determine desired modes of flows of fresh air and flows of exhaust gases; and
adjusting the first control element and the second control element as a function of the desired modes, the desired modes including a first desired mode and a second desired mode and a third desired mode and a fourth desired mode and a fifth desired mode and a sixth desired mode;
wherein the adjusting step is comprised of:
adjusting the second control element into a first position such that only fresh air conducted through the compressor is supplied to the cylinder via the intake line in the first desired mode;
adjusting the second control element into a third position in which the intake line and the bypass line are connected to one another and to the cylinder in the second desired mode;
adjusting the second control element into a second position such that only recirculated exhaust gases is supplied to the cylinder via the intake line in a third desired mode; adjusting the first control element such that no exhaust gas is conducted through the recirculation line and all of the exhaust gas is conducted through the turbine in the fourth desired mode;
adjusting the first control element such that a part of the exhaust gas is conducted through the recirculation line and a remaining part of the exhaust gas is conducted through the turbine in the fifth desired mode; and
adjusting the first control element such that no exhaust gas is conducted through the turbine and all of the exhaust gas is conducted through the recirculation line in the sixth desired mode.

Assignees

• Ford Global Tech Llc

Inventors

• Yacoub Yasser Mohamed Sayed

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02D21/08

  the other gas being the exhaust gas of engine · CPC title

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• F02D41/068

  for warming-up · CPC title

• F02B47/08

  the substances including exhaust gas · CPC title