Control system for plant and air-fuel ratio control system for internal combustion engine

• US 20050033456A1
• Filed: 09/10/2004
• Published: 02/10/2005
• Est. Priority Date: 08/06/2001
• Status: Active Grant

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Yasui, Yuji, Iwaki, Yoshihisa
• Granted Patent: US 7,200,449 B2
• Time in Patent Office: Days
• US Class Current: 700/12
• CPC Class Codes: F02D 2041/1423 Identification of model or controller parameters
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 41/1402 Adaptive control
• CPC Class Codes: G05B 13/042 in which a parameter or coefficient is automatically adjusted to optimise the performance

Abstract

A control system for a plant, having an identifier and a controller. The identifier identifies model parameters of a controlled object model which is obtained by modeling the plant. The controller calculates a control input to the plant so that an output from the plant coincides with a control target value, using the identified model parameters. The controller calculates a self-tuning control input, using the model parameters identified by the identifier. The controller further calculates a damping control input according to the rate of change in the output from the plant or the rate of change in a deviation between the output from the plant and the control target value. The controller calculates the control input to the plant as a sum of the self-tuning control input and the damping control input.

Claims

1. A control system for a plant, said control system comprising:

identifying means for identifying model parameters of a controlled object model which is obtained by modeling said plant; and

control means for calculating a control input to said plant so that an output from said plant coincides with a control target value, using the model parameters identified by said identifying means, said control means including self-tuning control input calculating means for calculating a self-tuning control input, using the model parameters identified by said identifying means, and damping control input calculating means for calculating a damping control input according to a rate of change in the output from said plant or a rate of change in a deviation between the output from said plant and the control target value,

wherein the control input to said plant is calculated as a sum of the self-tuning control input and the damping control input.

2. The control system according to claim 1, wherein:

said self-tuning control input calculating means calculates the self-tuning control input so that a response characteristic of the deviation between the output from said plant and the control target value becomes a specified characteristic.

3. A control system for a plant, said control system comprising:

identifying means for identifying model parameters of a controlled object model which is obtained by modeling said plant; and

self-tuning control input calculating means for calculating a self-tuning control input to said plant, using the model parameters identified by said identifying means, so that an output from said plant coincides with a control target value,

wherein said self-tuning control input calculating means calculates the self-tuning control input so that a response characteristic of a deviation between the output from said plant and the control target value becomes a specified characteristic.

4. A control method for a plant, said control method comprising the steps of

a) identifying model parameters of a controlled object model which is obtained by modeling said plant;

b) calculating a self-tuning control input, using the identified model parameters;

c) calculating a damping control input according to a rate of change in an output from said plant or a rate of change in a deviation between the output from said plant and a control target value; and

d) calculating a control input to said plant as a sum of the self-tuning control input and the damping control input, so that the output from said plant coincides with the control target value.

5. The control method according to claim 4, wherein:

the self-tuning control input is calculated so that a response characteristic of the deviation between the output from said plant and the control target value becomes a specified characteristic.

6. A control method for a plant, said control method comprising the steps of.

a) identifying model parameters of a controlled object model which is obtained by modeling said plant;

and

b) calculating a self-tuning control input to said plant, using the identified model parameters, wherein an output from said plant coincides with a control target value;

wherein the self-tuning control input is calculated so that a response characteristic of a deviation between the output from said plant and the control target value becomes a specified characteristic.

7. A control system for a plant, said control system comprising:

an identifier for identifying model parameters of a controlled object model which is obtained by modeling said plant; and

a controller for calculating a control input to said plant so that an output from said plant coincides with a control target value, using the model parameters identified by said identifier, said controller including a self-tuning control input calculating module for calculating a self-tuning control input, using the model parameters identified by said identifier, and a damping control input calculating module for calculating a damping control input according to a rate of change in the output from said plant or a rate of change in a deviation between the output from said plant and the control target value,

wherein the control input to said plant is calculated as a sum of the self-tuning control input and the damping control input.

8. The control system according to claim 7, wherein:

said self-tuning control input calculating module calculates the self-tuning control input so that a response characteristic of the deviation between the output from said plant and the control target value becomes a specified characteristic.

9. A control system for a plant, said control system comprising:

an identifier for identifying model parameters of a controlled object model which is obtained by modeling said plant; and

a self-tuning control input calculating module for calculating a self-tuning control input to said plant, using the model parameters identified by said identifier, so that an output from said plant coincides with a control target value,

wherein said self-tuning control input calculating module calculates the self-tuning control input so that a response characteristic of a deviation between the output from said plant and the control target value becomes a specified characteristic.