Method and an apparatus for predicting intake manifold pressure of an internal-combustion engine

• US 7,346,592 B2
• Filed: 07/20/2006
• Issued: 03/18/2008
• Est. Priority Date: 10/30/2002
• Status: Expired due to Fees

• Current Assignee: Honda Motor Company
• Original Assignee: Honda Motor Company
• Inventors: Matsumoto, Michihiko, Shinjo, Akihiro, Yasui, Yuji
• Primary Examiner(s): Vincent; David
• Assistant Examiner(s): FERNANDEZ RIVAS, OMAR F
• Application Number:
  US11/489,508
• Publication Number:
  US 20060259228A1
• Time in Patent Office: 607 Days
• Field of Search: 706 1- 9, 706 15- 19, 706/22, 701 99-106, 701/115
• US Class Current: 706/1
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0408 Estimation of intake manifold pressure
• CPC Class Codes: F02D 41/1404 Fuzzy logic control
• CPC Class Codes: G05B 13/0275 using fuzzy logic only

Abstract

A method and an apparatus for predicting intake manifold pressure are presented, to compensate for a large lag or a large time delay without producing an overshot or discontinuous behaviors of a predicted value. The method comprises the step of obtaining a difference of values of a variable to be predicted and a difference of values of another variable ahead of the variable to be predicted. The method further comprises the step of filtering the differences with adaptive filters. The method further comprises the step of obtaining a predicted difference of values of the variable to be predicted, through algorithm of estimation with fuzzy reasoning. The method further comprises the step of adding the predicted difference of values of the variable to be predicted, to a current value of the variable to be predicted, to obtain a predicted value of the variable to be predicted.

Claims

1. A method for obtaining a predicted value of a variable, comprising the steps of:

obtaining a difference of values of the variable whose value is to be predicted and a difference of values of another variable ahead of the variable whose value is to be predicted;

filtering the differences with adaptive filters;

obtaining a predicted difference of values of the variable whose value is to be predicted, through an algorithm of estimation with fuzzy reasoning, including fuzzy rules determined based on an amount of a difference of values of the variable whose value is to be predicted and an amount of a difference of values of the variable ahead of the variable whose value is to be predicted; and

adding the predicted difference of values of the variable whose value is to be predicted to a current value of the variable whose value is to be predicted, to obtain a predicted value of the variable whose value is to be predicted.

4. The method of claim 1, wherein the variable whose value is to be predicted is intake manifold pressure.

5. The method of claim 1, wherein the variable ahead of the variable whose value is to be predicted is throttle opening.

2. A predicting apparatus, for obtaining a predicted value of a variable comprising:

adaptive filters for filtering inputs; and

a fuzzy estimator receiving as inputs a difference of values of the variable whose value is to be predicted and a difference of values of another variable ahead of the variable whose value is to be predicted and obtaining and outpuffing a predicted difference of values of the variable whose value is to be predicted, through an algorithm of estimation with fuzzy reasoning, including fuzzy rules determined based on an amount of a difference of values of the variable whose value is to be predicted and an amount of a difference of values of the variable ahead of the variable whose value is to be predicted.

6. The apparatus of claim 2, wherein the variable whose value is to be predicted is intake manifold pressure.

7. The apparatus of claim 2, wherein the variable ahead of the variable whose value is to be predicted is throttle opening.

3. A computer-readable medium having a program for obtaining a predicted value of a variable stored therein, the program is made to perform the steps of:

obtaining a difference of values of the variable whose value is to be predicted and a difference of values of another variable ahead of the variable whose value is to be predicted;

filtering the differences with adaptive filters;

obtaining a predicted difference of values of the variable whose value is to be predicted, through an algorithm of estimation with fuzzy reasoning, including fuzzy rules determined based on an amount of a difference of values of the variable whose value is to be predicted and an amount of a difference of values of the variable ahead of the variable whose value is to be predicted; and

adding the predicted difference of values of the variable whose value is to be predicted, to a current value of the variable whose value is to be predicted, to obtain a predicted value of the variable whose value is to be predicted.

8. The computer-readable medium of claim 3, wherein the variable whose value is to be predicted is intake manifold pressure.

9. The computer-readable medium of claim 3, wherein the variable ahead of the variable whose value is to be predicted is throttle opening.