Knock recognition in internal combustion engines with...

Details Knock recognition in internal combustion engines with... Knock recognition in internal combustion engines with...

2006-05-30

2006-05-30

Williams, Hezron (Department: 2856)

Internal-combustion engines

Spark ignition timing control

Electronic control

C073S035010, C073S035060, C073S035030, C073S035040, C073S114220, C123S406370

Reexamination Certificate

active

07051711

ABSTRACT:
Devices and methods for knock detection and knock control are described, in which, in addition to the customary component parts, the knock-detection circuit has a filter with switchable filter characteristic. The switchover of the filter characteristic, i.e. the shift, for example, of the mid-frequency of the filter, is carried out taking into consideration specifiable quantities or parameters, for instance, as a function of rotational speed. During the switchover of the filter characteristic, i.e. the shift of the mid-frequency, problems could occur in the knock detection; that is why measures are proposed which carry out the knock detection according to a special knock-detection algorithm during a switchover phase lasting a specifiable time.

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