Method for detecting knock in an internal combustion engine
First Claim
1. A method for detecting knock in an internal combustion engine with multiple cylinders, comprising the following steps:
- detecting knock in a selected one of the multiple cylinders when a detected and produced knock signal of the selected cylinder exceeds a reference level, wherein the reference level changes as a function of a sound level of the internal combustion engine, wherein an increase of the reference level is limited in consideration of a sound level of another one of the multiple cylinders or a sound level of all cylinders.
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Abstract
The method for knock detection includes establishing that knock is occurring in the internal combustion engine when the amplified knock signal exceeds a predetermined reference level in a predetermined manner. The reference level is determined on the basis of individual cylinders and the increase in the reference level is limited when a new reference level leaves a predetermined reference level range or the gradient of the sound increase exceeds a predetermined threshold value. For determination of the reference level range and/or the threshold for the gradient average values of the signals originating from the sound of other cylinders are considered.
31 Citations
11 Claims
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1. A method for detecting knock in an internal combustion engine with multiple cylinders, comprising the following steps:
detecting knock in a selected one of the multiple cylinders when a detected and produced knock signal of the selected cylinder exceeds a reference level, wherein the reference level changes as a function of a sound level of the internal combustion engine, wherein an increase of the reference level is limited in consideration of a sound level of another one of the multiple cylinders or a sound level of all cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification