Air charging control of engine assembly with multiple turbines

Patent metadata

Field	Value
Publication number	US-10316784-B2
Application number	US-201715615379-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Jun 6, 2017
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An engine assembly includes an engine and a plurality of actuators. The plurality of actuators includes a first turbine serially connected to a second turbine, the first turbine being a relatively high pressure turbine and the second turbine being a relatively low pressure turbine. A controller is configured to transmit respective command signals to the plurality of actuators. The controller is programmed to obtain respective transfer rates for the plurality of actuators based at least partially on an inversion model. The controller is programmed to control an output of the engine by commanding the plurality of actuators to respective operating parameters via the respective command signals. Prior to obtaining the respective transfer rates, the controller is programmed to determine a respective plurality of desired values and respective correction factors for the plurality of actuators.

First claim

What is claimed is:

1. A method of controlling air charging of an engine assembly having an engine configured to produce an exhaust gas discharged through an exhaust gas conduit, an intake throttle valve configured to adjust air delivered to the engine and positioned in an air inlet conduit, an exhaust gas recirculation (EGR) system, a two-stage turbocharger system, and a controller having a processor and a tangible, non-transitory memory on which is recorded instructions for executing a method, the two-stage turbocharger system including a high pressure turbine operatively connected to the engine, a low pressure turbine serially connected to the high pressure a second turbine, a high pressure turbine bypass valve configured to control the air to the high pressure turbine, a high pressure compressor configured to be driven by the high pressure turbine, and a low pressure compressor configured to be driven by the low pressure turbine, the exhaust gas recirculation (EGR) system including a high pressure exhaust gas recirculation valve located in a first conduit between the air inlet conduit and the exhaust gas conduit, and a low pressure exhaust gas recirculation valve located in a second conduit between the air inlet conduit and the exhaust gas conduit, the method comprising:
determining a respective plurality of desired values for the at least one of the intake throttle valve, the EGR system and the two-stage turbocharger system, and obtaining a sensor feedback from the sensor, via the controller;
obtaining respective correction factors for the at least one of the intake throttle valve, the EGR system and the two-stage turbocharger system based at least partially on the respective plurality of desired values and the sensor feedback;
obtaining respective transfer rates for the at least one of the intake throttle valve, the EGR system and the two-stage turbocharger system based at least partially on the respective correction factors, via the controller, the respective transfer rates including a low pressure turbine transfer rate (R t,LP );
obtaining the low pressure turbine transfer rate (R t,LP ) as a function of a low pressure turbine enthalpy (h t,LP ), a low pressure compressive power (P c,LP ), and one of the respective correction factors (v 1 ) such that:

R

t
,
LP

=

P

c
,
LP

h

t
,
LP

+

v
1

;

obtaining respective operating parameters for the at least one of the intake throttle valve, the EGR system and the two-stage turbocharger system based at least partially on the respective transfer rates, via the controller; and
controlling an output of the engine by commanding the at least one of the intake throttle valve, the EGR system and the two-stage turbocharger system to the respective operating parameters via respective command signals from the controller.

2. The method of claim 1 , wherein the respective transfer rates include a high pressure turbine transfer rate (R t,HP ), the method further comprising:
obtaining the high pressure turbine transfer rate (R t,HP ) as a function of a high pressure compressive power (P c,HP ), a desired charge flow into the high pressure turbine ( W t,HP,des ), an exhaust temperature (T x ), a predefined capacity (c p ) and another one of the respective correction factors (v 2 ) such that:

R

t
,
HP

=

P

c
,
HP

c
p

⁢

W
_

t
,
HP
,
des

⁢

T
x

+

v
2

.

3. The method of claim 1 , wherein the respective transfer rates include a intake throttle valve flow (W itv ), a high pressure EGR flow (W egr,HP ) and a low pressure EGR flow (W egr,LP ), the method further comprising:
obtaining the intake throttle valve flow (W itv ), the high pressure EGR flow (W egr,HP ) and the low pressure EGR flow (W egr,LP ) based at least partially on the total charge flow into the engine (W cyl ), a compressor inlet burnt gas fraction (F c ), an intake manifold burnt gas fraction (F i ), an exhaust manifold burnt gas fraction (F x ), a time (t), a time delay (τ), and other ones of the respective correction factors (v 4 , v 5 , v 6 ) such that:

[

W
itv

W

egr
,
HP

W

egr
,
LP

]

=

[

1

1

0

F
c

-

F

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wang Yue-Yun
• Haskara Ibrahim
• Conte Giuseppe
• Pedicini Carmen

Classifications

• F02D41/0007

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

• F02B37/013 Primary

  with exhaust-driven pumps arranged in series · CPC title

• F02D41/1402

  Adaptive control · CPC title

• F02D41/1401

  characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence) · CPC title

• F02D41/263 Primary

  the program execution being modifiable by physical parameters · CPC title