Adaptive control system for an engine
First Claim
1. A diagnostic method for an internal combustion engine having at least two control inputs which affect an engine output, said method comprising:
- (a) establishing a base value for one of said control inputs as a function of engine operating conditions;
(b) periodically perturbing said one control input about its base value;
(c) monitoring said engine output;
(d) determining the actual slope of said engine output with respect to perturbation of said one control input;
(e) establishing a desired value for said slope;
(f) determining any difference between said actual slope and said desired value; and
(g) storing in a storage means information relating to said difference.
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Abstract
An adaptive control system is provided for an internal combustion engine having at least two control inputs which affect an engine output. The system involves establishing a first base value for a first control input as a function of engine operating conditions and establishing a second base value for a second control input as a function of engine operating conditions. Corrections are applied in accordance with a predetermined control strategy to the first base value and the second base value to obtain a first corrected value for the first control input and a second corrected value for the second control input. A particular control input is periodically perturbed, and the engine output is monitored. The actual slope or differential of the engine output with respect to the particular control input is determined. The control strategy is predetermined to cause the actual slope to correspond to a desired value and to allow corrections to be applied to the first and second base values after corrections have become stabilized.
36 Citations
10 Claims
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1. A diagnostic method for an internal combustion engine having at least two control inputs which affect an engine output, said method comprising:
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(a) establishing a base value for one of said control inputs as a function of engine operating conditions; (b) periodically perturbing said one control input about its base value; (c) monitoring said engine output; (d) determining the actual slope of said engine output with respect to perturbation of said one control input; (e) establishing a desired value for said slope; (f) determining any difference between said actual slope and said desired value; and (g) storing in a storage means information relating to said difference. - View Dependent Claims (2, 3, 4, 5)
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6. A diagnostic apparatus for an internal combustion engine having at least two control inputs which affect an engine output, said system comprising:
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means for establishing a base value for one of said control inputs as a function of engine operating conditions; perturbation means for periodically perturbing said one control input about its base value; monitoring means for monitoring said engine output; slope detection means, responsive to said monitoring means, for determining the actual slope of said engine output with respect to perturbations of said one control input; means for establishing a desired value for said slope; comparison means, responsive to said slope detection means and said means for establishing a desired value for said slope, for determining any difference between said actual slope and said desired value; and storage means, responsive to said comparison means, for storing information relating to said difference. - View Dependent Claims (7, 8, 9, 10)
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Specification