AUTOMATIC ON-LINE TUNING OF THE KNOCK DETECTION SYSTEM ON AN ECU

Knock detection occupies a very important role in the ignition control of a Spark Ignition (S.I.) engine. Production-grade knock detection schemes must be computationally efficient and comprise a set of parameters which require calibration during Engine Control Unit (ECU) development. This is typically achieved empirically, whereby a calibration engineer induces knock on the ECU and monitors the detection performance to manually adjust the tunable parameters. In this paper, we propose automatic, on-line calibration of a production-grade, frequency-domain knock detection system. Compared to the conventional method of manual calibration, this method allows for on-line tuning of the parameters based on scientific optimization schemes. It thus enables the implementation of specific objective functions which can meet desired criteria.