Method of model-based multivariable control of egr, fresh mass air flow, and boost pressure for downsize boosted engines

Patent metadata

Field	Value
Publication number	US-2016146134-A1
Application number	US-201414549067-A
Country	US
Kind code	A1
Filing date	Nov 20, 2014
Priority date	Nov 20, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

An engine includes an exhaust gas recirculation system, an air throttle system, and a charging system. A method to control the engine includes monitoring desired operating target commands for each of the systems; monitoring operating parameters of the air charging system; and determining a feedback control signal for each of the systems based upon the respective desired operating target commands and the operating parameters of the air charging system. Exhaust gas recirculation flow in the exhaust gas recirculation system, air flow in the air throttle system and a turbine power parameter in the air charging system are determined based upon the respective feedback control signals for each of the systems. A system control command is determined for each of the systems based upon the respective exhaust gas recirculation flow, air flow and turbine power parameters. The air charging system is controlled based upon the system control commands for each of the systems.

First claim

1 . Method to control an exhaust gas recirculation system, an air throttle system, and an air charging system in an internal combustion engine, the method comprising:
monitoring desired operating target commands for each of the exhaust gas recirculation system, the air throttle system, and the air charging system; monitoring operating parameters of the air charging system; determining a feedback control signal for each of the exhaust gas recirculation system, the air throttle system and the air charging system based upon the respective desired operating target commands and the operating parameters of the air charging system; determining exhaust gas recirculation flow in the exhaust gas recirculation system, air flow in the air throttle system and a turbine power parameter in the air charging system based upon the respective feedback control signals for each of the exhaust gas recirculation system, the air throttle system and the air charging system; determining a system control command for each of the exhaust gas recirculation system, the air throttle system, and the air charging system based upon the respective exhaust gas recirculation flow, air flow and turbine power parameter; and controlling the air charging system based upon the system control commands for each of the exhaust gas recirculation system, the air throttle system, and the air charging system.

2 . The method of claim 1 , wherein the desired operating target commands comprise a desired intake manifold pressure command, a desired compressor pressure ratio command and a desired burned gas fraction command.

3 . The method of claim 1 , wherein the desired operating target commands comprise a desired intake manifold pressure command, a desired compressor pressure ratio command and a desired oxygen fraction command.

4 . The method of claim 1 , wherein the operating parameters of the air charging system comprise intake manifold pressure, intake manifold temperature, ambient pressure and ambient temperature.

5 . The method of claim 1 , wherein determining a feedback control signal for each of the exhaust gas recirculation system, the air throttle system and the air charging system based upon the respective desired operating target commands and the operating parameters of the air charging system comprises using a proportional-integral-derivative feedback control.

6 . The method of claim 1 , wherein determining a feedback control signal for each of the exhaust gas recirculation system, the air throttle system and the air charging system based upon the respective desired operating target commands and the operating parameters of the air charging system comprises using a linear quadratic regulator feedback control.

7 . The method of claim 1 , wherein determining a feedback control signal for each of the exhaust gas recirculation system, the air throttle system and the air charging system based upon the respective desired operating target commands and the operating parameters of the air charging system comprises using a model predictive feedback control.

8 . The method of claim 1 , wherein determining exhaust gas recirculation flow in the exhaust gas recirculation system, air flow in the air throttle system and turbine power in the air charging system based upon the respective feedback control commands for each of the exhaust gas recirculation system, the air throttle system and the air charging system is further based upon the monitored operating parameters of the air charging system.

9 . The method of claim 1 , further comprising determining a feed forward control command for each of the exhaust gas recirculation system, the air throttle system and the air charging system based upon the respective desired operating target commands for each of the exhaust gas recirculation system, the air throttle system, and the air charging system.

10 . The method of claim 9 , wherein determining exhaust gas recirculation flow in the exhaust gas recirculation system, air flow in the air throttle system and turbine power in the air charging system based upon the respective feedback control commands for each of the exhaust gas recirculation system, the air throttle system and the air charging system is further based upon the respective feed forward control commands for each of the exhaust gas recirculation system, the air throttle system and the air charging system.

11 . The method of claim 1 , wherein determining a system control command for each of the exhaust gas system, the air throttle system, and the air charging system based upon the respective exhaust gas recirculation flow, air flow and turbine power parameter comprises utilizing an inverse model of each respective system.

12 . Method to control an exhaust gas recirculation system, an air throttle system, and an air charging system in an internal combustion engine, the method comprising:
providing a physics based air and charging system model of the internal combustion engine; applying model-based nonlinear control to the physics based air and charging system model of the internal combustion engine; applying feedback control to the physics based air and charging system model; transforming desired air and charging targets for the air and charging system model to individual flow or power signals for each of an EGR actuator, an ITV actuator and a VGT actuator; and determining an actuator position for each of the EGR actuator, ITV actuator and VGT actuator based upon the respective individual flow or power signals.

13 . The method of claim 12 , wherein applying model-based nonlinear control to the physics based air and charging system model of the internal combustion engine comprises applying physics model-based multivariable feedforward control to the physics based air and charging system model.

14 . The method of claim 12 , wherein applying model-based nonlinear control to the physics based air and charging system model of the internal combustion engine comprises applying state feedback linearization control to the physics based air and charging system model.

15 . The method of claim 12 , wherein applying feedback control to the physics based air and charging system model comprises using a proportional-integral-derivative feedback control.

16 . The method of claim 12 , wherein applying feedback control to the physics based air and charging system model comprises using a model predictive feedback control.

17 . The method of claim 12 , wherein applying feedback control to the physics based air and charging system model comprises using a linear quadratic regulator feedback control.

18 . The method of claim 12 , said physics based air and charging system model of the internal combustion engine comprises a system model in accordance with the following relationship:
{dot over (y)}=F ( y )+ Bu wherein u is described by the following relationship:
u=−B −1 F ( y )+ B −1 v

19 . The method of claim 18 , wherein said system model is expressed by the following system relationships:

p
.

rc

=

-
c





P
c

Assignees

• Gm Global Tech Operations Inc

Inventors

• Wang Yue-Yun
• Haskara Ibrahim
• Alfieri Vincenzo
• Conte Giuseppe

Classifications

• F02D41/0052 Primary

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

• F02D2041/0017

  by simultaneous control of throttle and exhaust gas recirculation · CPC title

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · 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

• F02D2041/1433

  using a model or simulation of the system · CPC title