Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2000-05-19
2001-11-06
Kwon, John (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C123S406380
Reexamination Certificate
active
06311671
ABSTRACT:
BACKGROUND INFORMATION
The present invention relates to a method for controlling knocking. A knock control system is already known from German Patent No. 33 13 036, in which at least one knock sensor and a downstream signal conditioning arrangement are provided and in which a knocking combustion event is detected when the conditioned knock sensor signal exceeds a reference level. To prevent knocking operation of the internal combustion engine, an electronic controller is provided which influences knocking in the internal combustion engine by correspondingly controlling different functions, such as the ignition function. For example, upon detecting knocking combustion events, the ignition function is adjusted stepwise away from the knock limit. A method is also known for stepwise cancellation of the ignition function adjustment after a knocking combustion event once the knocking combustion event is no longer present, with stepped return adjustment accelerating when a transient state is detected.
SUMMARY OF THE INVENTION
The method according to the present invention with the characterizing features of the has the advantage that the difference in the knock-induced ignition timing adjustment enables the knock control system to perform a very accurate adjustment of the ignition angle as a function of knock frequency, depending on the requirements. Furthermore, it achieves a much faster adjustment of the knock control system to the current knock limit, which is dependent on instantaneous operating conditions, such as load and rotational speed. Finally, this form of knock control has the advantage that the various knock-control-related differences in the ignition angle produce only minor torque fluctuations.
One particular advantage is the fact that the number of non-knocking combustion events between two knocking combustion events, or the time between two knocking combustion events, is a measure of knock frequency. Likewise, the speed at which the ignition angle is returned can be determined by the step size or step frequency as a function of the predetermined adjustment away from the knock limit. This ensures that the ignition angle returns much more accurately to the knock limit with small steps in the retard adjustment, thereby avoiding an unnecessary fluctuation of the ignition angle at the knock limit.
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Baeuerle Michael
Haeming Werner
Kluth Carsten
Sloboda Robert
Surjadi Iwan
Kenyon & Kenyon
Kwon John
Robert & Bosch GmbH
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