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AssigneeSaab-Scania Aktiebolag
InventorSten R. Jiewertz
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A method and an arrangement for regulating the signal level in detecting knocking in an internal combustion engine. A transducer, incorporated in a knocking detector, senses a parameter responding to pressure and/or temperature during combustion in the engine and emits a signal representing the degree of knocking. The output signal of the knocking detector controls a knocking-regulating quantity affecting combustion in the engine by being applied to a signal level limiting block which, when knocking sensed by the transducer exceeds a preselected level, limits the output signal level to a level corresponding to said preselected level, whereafter the output signal, at least for a limited time, can only be altered by signals representing a lesser degree of knocking than the preselected degree. Knocking can then be inhibited without delay.
A method of regulating the signal level in detect of abnormal combustion processes, so-called knocking, in an internal combustion engine, said method comprising the steps of:
An arrangement for regulating the signal level in detection of abnormal combustion processes, so-called knocking, in an internal combustion engine, at least one transducer, incorporated in a knocking detector, being connected to the engine and adapted for sensing a parameter which is affected by the pressure and/or temperature conditions prevailing during combustion in the engine and for giving in response thereto an output signal representing the degree of knocking in the engine, said output signal being applied to an electronic unit for regulating the combustion process in the engine, characterized in that the transducer is connected to a signal level limiting block incorporated in the electronic unit, said block including a detector for sensing a signal level, said detector comparing the instant output signal from the transducer with a preselected signal level representing a threshold value, and a time circuit which, in response to said comparison, regulates the time during which the signal level limiting block is to affect or modify the output signal of the transducer.
Dependencies are inferred from the claim text.