Control method for variable geometry exhaust turbine

Patent metadata

Field	Value
Publication number	US-9915197-B2
Application number	US-201214410836-A
Country	US
Kind code	B2
Filing date	Jun 26, 2012
Priority date	Jun 26, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A method of setting actuator position of a variable geometry turbine linked to drive a compressor for a compression ignition engine using exhaust gas recirculation. The method includes detecting an engine transient event; determining current mass air flow through the compressor and exhaust temperature; resetting variable geometry turbine position to maximize mass air flow through the compressor; adding the maximum allowable quantity of fuel; determining exhaust temperature increase; adjusting exhaust pressure to allow an increase in mass air flow and exhaust temperature; and returning to the resetting step until a limit is reached.

First claim

What is claimed is:

1. A method of setting flow through variable geometry turbine linked to drive a compressor into an intake manifold for a compression ignition engine, the method comprising the steps of:
a) detecting engine operational transient events demanding increased power output;
b) from current mass air flow through the compressor, exhaust temperature and intake manifold pressure, selecting a predetermined exhaust back pressure target setpoint to maximize mass air flow and minimize pumping loss;
c) obtaining current exhaust back pressure;
d) determining the difference between current exhaust back pressure and the exhaust back pressure target setpoint;
e) varying flow through the variable geometry turbine to eliminate the difference;
f) increasing fuel flow to a maximum allowable rate; and
g) returning to step b) until the engine steady state operating conditions exist or a predetermined limit condition is met.

2. The method of claim 1 wherein step e) is modified to limit variation to maintain a minimum level of exhaust gas recirculation.

3. The method of claim 2 wherein step e) includes adjusting vane position in the variable geometry turbine.

Assignees

• Cattani Luis C
• Uchanski Michael
• Rodriguez Rogelio
• Cigler James R
• Schipper Jeremy G
• Chen Jer Sheng
• Khadilkar Dileep
• Kanchanavally Shree C
• Zagone John R
• Cornelius Daniel
• Int Eng Ip Co Llc

Inventors

• Cattani Luis C
• Uchanski Michael
• Rodriguez Rogelio
• Cigler James R
• Schipper Jeremy G
• Chen Jer Sheng
• Khadilkar Dileep
• Kanchanavally Shree C
• Zagone John R
• Cornelius Daniel

Classifications

• F02M26/04

  with a single turbocharger · CPC title

• F02D2200/602

  Pedal position · 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

• F02D41/1446

  the characteristics being exhaust temperatures · CPC title

• F02D2250/34

  Control of exhaust back pressure, e.g. for turbocharged engines · CPC title