Control system for throttle valve actuating device

• US 6,848,420 B2
• Filed: 08/13/2003
• Issued: 02/01/2005
• Est. Priority Date: 08/22/2002
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Sato, Masahiro, Akazaki, Shusuke, Ishiguro, Tetsuya, Hashimoto, Eiji
• Primary Examiner(s): Solis, Erick
• Application Number:
  US10/640,946
• Publication Number:
  US 20040035393A1
• Time in Patent Office: 538 Days
• Field of Search: 123/399, 123/361
• US Class Current: 123/399
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 11/107 Safety-related aspects
• CPC Class Codes: F02D 2041/1423 Identification of model or controller parameters
• CPC Class Codes: F02D 41/1403 Sliding mode control

Abstract

A control system for a throttle valve actuating device is disclosed. The throttle valve actuating device has a throttle valve of an internal combustion engine and an actuator for actuating the throttle valve. Model parameters of a controlled object model obtained by modeling the throttle valve actuating device is identified by an identifier. The model parameters includes a specific model parameter irrelevant to an input and an output of the controlled object model. An opening of the throttle valve is controlled to a target opening using the identified model parameters. It is determined that the throttle valve actuating device is abnormal when the value of the specific model parameter becomes greater than a predetermined value.

Claims

1. A control system for a throttle valve actuating device having a throttle valve of an internal combustion engine and actuating means for actuating said throttle valve, said control system comprising:

identifying means for identifying model parameters of a controlled object model obtained by modeling said throttle valve actuating device, said model parameters including a specific model parameter irrelevant to an input and an output of said controlled object model;

control means for controlling an opening of said throttle valve to a target opening using the model parameters identified by said identifying means; and

abnormality determining means for determining that said throttle valve actuating device is abnormal when the value of the specific model parameter becomes greater than a predetermined value.

2. A control system according to claim 1, wherein said abnormality determining means determines that movement of said throttle valve is impeded when the absolute value of the specific model parameter continues to be greater than a first predetermined value for at least a first predetermined period.

3. A control system according to claim 1, wherein said throttle valve actuating device further includes first biasing means for biasing said throttle valve in a valve closing direction and second biasing means for biasing said throttle valve in a valve opening direction, wherein the opening of said throttle valve is maintained at a predetermined retention opening when said throttle valve is not actuated by said actuating means.

4. A control system according to claim 3, wherein said abnormality determining means determines that said first biasing means is abnormal when the opening of said throttle valve is greater than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.

5. A control system according to claim 3, wherein said abnormality determining means determines that said second biasing means is abnormal when the opening of said throttle valve is less than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.

6. An abnormality determining method for a throttle valve actuating device having a throttle valve of an internal combustion engine and an actuator for actuating said throttle valve, said abnormality determining method comprising the steps of:

a) identifying model parameters of a controlled object model obtained by modeling said throttle valve actuating device, said model parameters including a specific model parameter irrelevant to an input and an output of said controlled object model;

b) controlling an opening of said throttle valve to a target opening using the identified model parameters; and

c) determining that said throttle valve actuating device is abnormal when the value of the specific model parameter becomes greater than a predetermined value.

7. An abnormality determining method according to claim 6, wherein it is determined that movement of said throttle valve is impeded when the absolute value of the specific model parameter continues to be greater than a first predetermined value for at least a first predetermined period.

8. An abnormality determining method according to claim 6, wherein said throttle valve actuating device further includes a first biasing element for biasing said throttle valve in a valve closing direction and a second biasing element for biasing said throttle valve in a valve opening direction, wherein the opening of said throttle valve is maintained at a predetermined retention opening when said throttle valve is not actuated by said actuator.

9. An abnormality determining method according to claim 8, wherein it is determined that said first biasing element is abnormal when the opening of said throttle valve is greater than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.

10. An abnormality determining method according to claim 8, wherein it is determined that said second biasing element is abnormal when the opening of said throttle valve is less than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.

11. A computer program for causing a computer to carry out an abnormality determining method for a throttle valve actuating device having a throttle valve of an internal combustion engine and an actuator for actuating said throttle valve, said abnormality determining method comprising the steps of:

a) identifying model parameters of a controlled object model obtained by modeling said throttle valve actuating device, said model parameters including a specific model parameter irrelevant to an input and an output of said controlled object model;

b) controlling an opening of said throttle valve to a target opening using the identified model parameters; and

c) determining that said throttle valve actuating device is abnormal when the value of the specific model parameter becomes greater than a predetermined value.

12. A computer program according to claim 11, wherein it is determined that movement of said throttle valve is impeded when the absolute value of the specific model parameter continues to be greater than a first predetermined value for at least a first predetermined period.

13. A computer program according to claim 11, wherein said throttle valve actuating device further includes a first biasing element for biasing said throttle valve in a valve closing direction and a second biasing element for biasing said throttle valve in a valve opening direction, wherein the opening of said throttle valve is maintained at a predetermined retention opening when said throttle valve is not actuated by said actuator.

14. A computer program according to claim 13, wherein it is determined that said first biasing element is abnormal when the opening of said throttle valve is greater than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.

15. A computer program according to claim 13, wherein it is determined that said second biasing element is abnormal when the opening of said throttle valve is less than said predetermined retention opening, a parameter indicative of a control deviation is less than a predetermined deviation, and the value of the specific model parameter continues to be greater than a second predetermined value for at least a second predetermined period.