On-line adaptive PID control of air charging system

Patent metadata

Field	Value
Publication number	US-9777657-B2
Application number	US-201414573554-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Dec 17, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An internal combustion engine includes an air charging system. A method to control the air charging system includes providing a desired operating target command for the air charging system, and monitoring operating parameters of the air charging system. An error between the desired operating target command for the air charging system and the corresponding one of said operating parameters of the air charging system is determined, and scheduled PID gains are determined based on the error utilizing a PID controller. An adaptive algorithm is applied to modify the scheduled PID gains, and a system control command for the air charging system is determined based upon the modified scheduled PID gains. The air charging system is controlled based upon the system control command for the air charging system.

First claim

The invention claimed is:

1. Method to control an air charging system of an internal combustion engine, the method comprising:
providing a desired operating target command for the air charging system;
monitoring operating parameters of the air charging system;
determining an error between the desired operating target command for the air charging system and the corresponding one of said operating parameters of the air charging system;
determining scheduled PID gains based on the error utilizing a PID controller expressed in accordance with the following relationship:
u ( t )= K p e ( t )+ K I ∫e ( t ) dt+K D ė ( t )

wherein K p is a proportional gain,
K I is an integral gain,
K D is a derivative gain,
t is time, and
e(t) is an error function determining an error value between a setpoint and a monitored system parameter;

applying an adaptive algorithm to modify the scheduled PID gains using a gradient search expressed in accordance with the following relationship:

θ
.

=

-
Γ

*

∇

J
θ

=

Γ
*
ɛ
*

g
⁡

(
t
)

*

[

e
⁡

(
t
)

∫

e
⁡

(
t
)

⁢

ⅆ
t

e
.

⁡

(
t
)

]

wherein Γ is an adaptive gain,
∇J θ is a global minimum of the cost function,
ε is an error value equivalent to e(t),
g(t) is a system gain function,
θ is a vector of PID gains;

determining a system control command for the air charging system based upon the modified scheduled PID gains; and
controlling the air charging system based upon the system control command for the air charging system.

2. The method of claim 1 , wherein the desired operating target command comprises a target exhaust gas ratio.

3. The method of claim 1 , wherein the desired operating target command comprises a target boost pressure.

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

5. Method to control an air charging system of an internal combustion engine, the method comprising:
providing a desired operating target command for the air charging system;
monitoring operating parameters of the air charging system;
determining an error between the desired operating target command for the air charging system and the corresponding one of said operating parameters of the air charging system;
determining scheduled PID gains based on the error utilizing a PID controller expressed in accordance with the following relationship:
u ( t )= K p e ( t )+ K I ∫e ( t ) dt+K D ė ( t )

wherein K p is a proportional gain,
K I is an integral gain,
K D is a derivative gain,
t is time, and
e(t) is an error function determining an error value between a setpoint and a monitored system parameter;

applying an adaptive algorithm to modify the scheduled PID gains expressed in accordance with the following relationship:

[

K
p

⁡

(

k
+
1

)

K
I

⁡

(

k
+
1

)

K
D

⁡

(

k
+
1

)

]

=

[

K
p

⁡

(
k
)

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wang Yue-Yun
• Haskara Ibrahim
• Chang Chen-Fang
• Muldoon Steven E

Classifications

• F02D2041/1422

  Variable gain or coefficients · CPC title

• F02D21/08 Primary

  the other gas being the exhaust gas of engine · CPC title

• F02D41/1401 Primary

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

• F02D41/1406

  with use of a optimisation method, e.g. iteration · CPC title

• F02D9/00

  Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits · CPC title