System and method for controlling exhaust emissions and specific fuel consumption of an engine

Patent metadata

Field	Value
Publication number	US-2016010576-A1
Application number	US-201514858523-A
Country	US
Kind code	A1
Filing date	Sep 18, 2015
Priority date	Oct 19, 2012
Publication date	Jan 14, 2016
Grant date	—

Abstract

A method includes controlling an engine speed based on: intake manifold air temperature and/or intake manifold pressure one, or more, of the following data parameters: an engine load as a function of a fuel level, a fuel injecting timing, an intake oxygen concentration, a constituent concentration from the exhaust gas flow, an engine power, and an engine torque. The method also recirculates a portion of the exhaust gas flow to the combustion cylinders of the engine via a recirculation channel, as a function of intake manifold temperature and/or intake manifold pressure at which the engine is operated. An engine system, other methods, and a non-transitory computer readable medium encoded with a program, to enable a processor-based control unit to control aspects of the engine are also disclosed.

First claim

1 . A method comprising:
controlling an engine speed based on:
at least one of: intake manifold air temperature and intake manifold pressure; and
at least one data parameter of: an engine load as a function of a fuel level, a fuel injecting timing, an intake oxygen concentration, a constituent concentration in at least a portion of an exhaust gas flow, an engine power, and an engine torque; and
recirculating at least a portion of the exhaust gas flow to a plurality of combustion cylinder of the engine via a recirculation channel, as a function of at least one of the intake manifold temperature and intake manifold pressure at which the engine is operated.

2 . The method of claim 1 , further comprising selectively bypassing a turbine feeding at least a portion of the exhaust gas flow via an exhaust channel.

3 . The method of claim 1 , wherein the fuel level comprises a notch setting.

4 . The method of claim 1 , wherein the constituent comprises at least one of: NO x , an exhaust oxygen content, and soot content.

5 . The method of claim 1 , wherein the at least one data parameter is disposed in at least one map, and further comprising:
selecting a map from a plurality of maps based on at least one of: intake manifold air temperature, pressure, engine speed, load, ambient temperature, and altitude.

6 . The method of claim 1 , wherein at least one of intake air flow and exhaust gas flow are taken as a function of the engine speed.

7 . An engine system comprising:
an engine comprising a plurality of combustion cylinders; a turbine coupled to the engine, and configured to expand a first portion of an exhaust gas generated from the plurality of combustion cylinders; a recirculation channel for recirculating a third portion of the exhaust gas to the plurality of combustion cylinders, as a function of at least one of intake manifold temperature and intake manifold pressure at which the engine operates; and a controller configured to control engine speed based on:
at least one of: intake manifold air temperature and intake manifold pressure; and
at least one data parameter of: an engine load as a function of a fuel level, a fuel injecting timing, an intake oxygen concentration, a constituent concentration in at least a portion of an exhaust gas flow, an engine power, and an engine torque.

8 . The engine system of claim 7 , further comprising an exhaust channel for feeding a second portion of the exhaust gas bypassing the turbine.

9 . The engine system of claim 7 , wherein the fuel level comprises a notch setting.

10 . The engine system of claim 7 , wherein the engine system has no aftertreatment system.

11 . A non-transitory computer readable medium encoded with a program, to enable a processor-based control unit to:
control at least one of:
at least one of: intake manifold air temperature and intake manifold pressure; and
at least one data parameter of: an engine load as a function of a fuel level, a fuel injecting timing, an intake oxygen concentration, a constituent concentration in at least a portion of an exhaust gas flow, an engine power, and an engine torque.

12 . A method comprising:
maintaining for an operating engine one of:
specific fuel consumption (SFC) within a predefined SFC limit for the operating engine; and
an exhaust emission within a predefined emission limit for the operating engine by controlling one of:
adjusting a power to a compressor; and
recirculating a third portion of the exhaust gas to a plurality of combustion cylinders via a recirculation channel, as a function of an intake manifold air temperature and pressure at which the engine is operated.

13 . The method of claim 12 , wherein the adjusting the power to the compressor comprises feeding a second portion of an exhaust gas via an exhaust channel bypassing a turbine.

14 . The method of claim 12 , wherein the exhaust emission is one of NO x and soot.

15 . The method of claim 12 , wherein the predefined emission limit is a Tier 4 standard.

16 . The method of claim 12 , the maintaining further comprising maintaining concurrently both the specific fuel consumption (SFC) within the predefined SFC limit and the exhaust emission within the predefined emission limit.

17 . The method of claim 12 , wherein the operating engine operates with no exhaust after treatment system.

18 . The method of claim 12 , the controlling further comprising controlling operation of a plurality of fuel injectors.

19 . The method of claim 18 , the controlling operation of the plurality of fuel injectors comprising one of:
controlling engine speed; and controlling fuel mass flow.

Assignees

• Gen Electric

Inventors

• Primus Roy James
• Akinyemi Omowoleola Chukwuemeka
• Lavertu Thomas Michael
• Mischler James Robert
• Gupta Venu Gummadavelli

Classifications

• F02D41/1477

  characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output) · CPC title

• F02D41/0052 Primary

  Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount · CPC title

• F02B37/18

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F02M26/05

  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 · CPC title

• F02M26/08

  for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor · CPC title