Systems and methods for an engine

Patent metadata

Field	Value
Publication number	US-9404448-B2
Application number	US-201514803928-A
Country	US
Kind code	B2
Filing date	Jul 20, 2015
Priority date	Jun 3, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Methods and systems for an engine are provided. In one example, a system for an engine comprises an exhaust passage through which exhaust gas is configured to flow from the engine, a turbocharger with a turbine positioned in the exhaust passage, an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine and including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a transient engine operating condition, and an exhaust gas recirculation system coupled between the exhaust passage and an intake passage of the engine, the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system.

First claim

The invention claimed is:

1. A system for an engine, comprising:
an exhaust passage through which exhaust gas is configured to flow from the engine;
a turbocharger with a turbine positioned in the exhaust passage;
an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to control exhaust gas flow through the exhaust gas treatment system;
an exhaust gas recirculation system coupled between the exhaust passage and an intake passage of the engine, the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system;
a control unit configured to control the bypass valve to reduce the exhaust gas flow through the exhaust gas treatment s stem in response to a transient operatin condition; and
a throttle having plural throttle settings, wherein the control unit is configured to automatically control the throttle based on a trip plan, and wherein the transient engine operating condition is initiated by a shift from one of the throttle settings to another of the throttle settings.

2. A system for an engine, comprising:
an exhaust passage through which exhaust gas is configured to flow from the engine;
turbocharger with a turbine positioned in the exhaust passage;
an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a transient engine operating condition, and the bypass valve is further configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a temperature of the exhaust gas treatment system exceeding a threshold; and
an exhaust as recirculation system coupled between the exhaust passage and an intake passage of the engine, the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system.

3. The system of claim 2 , wherein the at least one exhaust gas treatment device includes one or more of a diesel oxidation catalyst and a particulate oxidation catalyst.

4. The system of claim 2 , further comprising a control unit for adjusting the bypass valve, wherein the control unit is configured to control the bypass valve to an open position in order to reduce the exhaust gas flow through the exhaust gas treatment system in response to the transient operating condition.

5. The system of claim 2 , further comprising a notched throttle, the notched throttle having a plurality of notches, each notch corresponding to a different power setting of the engine, wherein the transient engine operating condition is initiated by a shift of the notched throttle from one notch to another notch.

6. A system for an engine, comprising:
an exhaust passage through which exhaust gas is configured to flow from the engine;
a turbocharger with a turbine positioned in the exhaust passage;
an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a transient engine operating condition; and
an exhaust gas recirculation system coupled between the exhaust passage and an intake passage of the engine the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system,
wherein the at least one exhaust gas recirculation valve comprises a bypass valve coupling an exhaust manifold of the engine to the exhaust passage and a metering valve coupling the exhaust manifold to the exhaust gas recirculation passage, and wherein the exhaust gas recirculation system is configured for the metering valve to be closed during the transient engine operating condition.

7. The system of claim 6 , wherein the exhaust manifold is a first exhaust manifold, and wherein the engine includes a first group of cylinders coupled to the first exhaust manifold and a second group of cylinders coupled to a second exhaust manifold, the second exhaust manifold coupled to the exhaust passage.

8. A system for an engine, comprising:
an exhaust passage through which exhaust gas is configured to flow from the engine;
turbocharger with a turbine positioned in the exhaust passage;
an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a transient engine operating condition,
an exhaust gas recirculation system coupled between the exhaust passage and an intake passage of the engine the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system; and
a control unit for adjusting the bypass valve, wherein the control unit is configured to open the bypass valve in response to an ambient temperature exceeding a threshold.

9. A system comprising:
an engine, wherein the engine is configured to combust a liquid fuel and a gaseous fuel;
an exhaust passage through which exhaust gas is configured to flow from the engine;
a turbocharger with a turbine positioned in the exhaust passage;
an exhaust gas treatment system disposed in the exhaust passage upstream of the turbine, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system in response to a transient engine operating condition; and
an exhaust gas recirculation system coupled between the exhaust passage and an intake passage of the engine, the exhaust gas recirculation system including an exhaust gas recirculation passage and at least one exhaust gas recirculation valve, an inlet of the exhaust gas recirculation system positioned upstream of the exhaust gas treatment system, and wherein the transient operating condition comprises engine operation with only liquid fuel delivered to the engine.

10. A rail vehicle system, comprising:
an engine;
an exhaust passage through which exhaust gas is configured to flow from the engine;
a turbocharger with a turbine positioned in the exhaust passage;
a notched throttle, the notched throttle having a plurality of discrete notches, each notch corresponding to a different discrete power se ting of the engine; and
an exhaust gas treatment system disposed in the exhaust passage, the exhaust gas treatment system including at least one exhaust gas treatment device and a bypass with a bypass valve, the bypass valve configured to be adjusted to reduce exhaust gas flow through the exhaust gas treatment system

Assignees

• Gen Electric

Inventors

• Gokhale Manoj

Classifications

• F02D19/0692

  Arrangement of multiple injectors per combustion chamber · CPC title

• F01N2410/10

  for reducing flow resistance, e.g. to obtain more engine power · CPC title

• F01N3/10

  by thermal or catalytic conversion of noxious components of exhaust · CPC title

• F02D41/0055

  Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus · CPC title

• Y02T10/142

  Cross-Sectional Technologies · mapped topic