US 9,777,657 B2 · On-line adaptive PID control of air charging system

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.

Claims16

Dependent claims

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)=Kpe(t)+KI∫e(t)dt+KDė(t)
wherein Kp is a proportional gain,
KI is an integral gain,
KD 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,
∇Jθ 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.

58 more elements

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 desired operating target command for each of the exhaust gas recirculation system, the air throttle system and the air charging system;
monitoring operating parameters for each of the exhaust gas recirculation system, the air throttle system, and the air charging system;
determining an error between the monitored desired operating target commands for each of the exhaust gas recirculation system, the air throttle system, and the air charging system and the corresponding operating parameter of the respective system;
determining scheduled PID gains for each of the exhaust gas recirculation system, the air throttle system and the air charging system based on the respective error for each of the exhaust gas recirculation system, the air throttle system and the air charging system utilizing PID control expressed by the following relationship:
u(t)=Kpe(t)+KI∫e(t)dt+KDė(t)
wherein Kp is a proportional gain,
KI is an integral gain,
KD 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 each of the scheduled PID gains comprising applying an adaptive algorithm for a general nonlinear system expressed in accordance with the following relationship:
[
K
p
⁡
(
k
+
1
)
K
I
⁡
(
k
+
1
)
K
D
⁡
(
k
+
1
)
]
=
[
K
p
⁡
(
k
)
K
I
⁡
(
k
)
K
D
⁡
(
k
)
]
+
Δ
⁢
⁢
T
*
Γ
*
F
u
′
⁡
(
t
)
*
[
e
⁡
(
t
)
∫
e
⁡
(
t
)
⁢
ⅆ
t
e
.
⁡
(
t
)
]
⁢
ɛ
wherein k is a present iteration of a scheduled gain, and
ΔT is a discrete sampling rate,
Γ is an adaptive gain,
F′u(t) is a partial derivative of the plant function and
ε is an error value equivalent to e(t);
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 modified scheduled PID gains;
and
controlling the air charging system based upon said system control commands.

103 more elements

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 desired operating target command for each of the exhaust gas recirculation system, the air throttle system and the air charging system;
monitoring operating parameters for each of the exhaust gas recirculation system, the air throttle system, and the air charging system;
determining an error between the monitored desired operating target commands for each of the exhaust gas recirculation system, the air throttle system, and the air charging system and the corresponding operating parameter of the respective system;
determining scheduled PID gains for each of the exhaust gas recirculation system, the air throttle system and the air charging system based on the respective error for each of the exhaust gas recirculation system, the air throttle system and the air charging system utilizing PID control;
applying an adaptive algorithm to modify each of the scheduled PID gains, wherein applying the adaptive algorithm to modify each of the scheduled PID gains comprises for each of the exhaust gas recirculation system, air throttle system and air charging system:
determining a set of PID error terms by multiplying said error between the monitored desired operating target command for the respective system and the corresponding monitored operating parameter of the respective system by each of a present error, a past error and a prediction of future errors;
determining a set of PID system gain terms by multiplying the set of PID error terms by a system gain based on a partial derivative of a system control command and a partial derivative of the corresponding monitored operating parameter of the respective system;
determining a set of adapted PID system gains by multiplying the set of PID system gain terms by an adaptation rate;
determining a set of PID scheduled gain modifiers by integrating the set of adapted PID system gains;
and
modifying the scheduled PID gains by adding the PID scheduled gain modifiers to the scheduled gains;
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 modified scheduled PID gains;
and
controlling the air charging system based upon said system control commands.

11 more elements

Method to control an air charging system using on-line fine tuning of PID gains comprising:

providing a desired operating target command for the air charging system;
monitoring an operating parameter of the air charging system;
determining an error between the desired operating target command for the air charging system and the monitored operating parameter of the air charging system;
determining scheduled PID gains based on the error utilizing a PID controller;
applying adaptive PID control to modify the scheduled PID gains, comprising;
determining a set of PID error terms by multiplying the error between the monitored desired operating target command for the air charging system and the monitored operating parameter of the air charging system by each of a present error, a past error and a prediction of future errors;
determining a set of PID system gain terms by multiplying the set of PID error terms by a system gain based on a partial derivative of a system control command and a partial derivative of the operating parameter of the air charging system;
determining a set of adapted PID system gains by multiplying the PID system gain terms by an adaptation rate;
determining a set of PID scheduled gain modifiers by integrating the set of adapted PID system gains;
modifying the scheduled PID gains by adding the PID scheduled gain modifiers to the scheduled gains;
determining a system control command for the air charging system based upon the modified scheduled gains;
and
controlling the air charging system based upon the system control command for the air charging system.

10 more elements

Dependencies are inferred from the claim text.

On-line adaptive PID control of air charging system

Life of this patent

On-line adaptive PID control of air charging system

Life of this patent

Abstract

Claims16