US 4,899,710 A · System and method for detecting and determining knocking in an internal combustion engine

Abstract

A system and method for detecting and determining knocking in an internal combustion engine in which various kinds of signals (engine vibrations, engine revolution speed, opening angle of a throttle valve, crank angle, ignition crank angle, and so on) are weighted by means of weight vectors so as to form a knocking decision signal. The knocking decision signal is compared with a reference signal so as to determine whether the knocking is occuring. The correctness or incorrectness of the determination result is determined on the basis of a highly accurate knocking detecting information provided by means of an external test device. The weight vectors are corrected in a direction in which the percentage of correct answers increases under the various engine operating conditions. The weight vectors thus corrected and learned are used to carry out highly accurate knocking detection under varying engine operating conditions. The process can be repeated as a part of normal servicing so as to compensate for the effects of aging.

Claims14

Dependent claims

A system for detecting and determining knocking in an internal combustion engine, comprising:

(a) first means for detecting various engine operating conditions including engine vibrations associated with engine knocking and outputting a plurality of signals indicative of the various engine operating conditions;
(b) second means for weighting various signals detected and outputted by the first means using a weight vector and for producing a knocking occurrence decision signal used to determine whether the engine is knocking;
(c) third means for comparing the knocking occurrence decision signal with a reference signal so as to determine whether the knocking decision signal is accurate on the basis of the comparison result;
(d) fourth means for determining whether the knocking determination carried out by means of the third means is correct on the basis of an externally provided highly-accurate knocking detection information;
and
(e) fifth means for correcting the weight vector of the second means on the basis of the determination result by the fourth means in a direction such that a percentage of correct answer determinations made by the fourth means can be enhanced.

3 more elements

Dependencies are inferred from the claim text.

System and method for detecting and determining knocking in an internal combustion engine

Life of this patent

System and method for detecting and determining knocking in an internal combustion engine

Life of this patent

Abstract

Claims14