2 Introduction
ARIADNE Knock Control 5
2 Introduction
Knocking is an uncontrolled combustion process of gas engines, generating high frequency
pressure vibrations in the combustion chamber, reducing engine performances and potentially
leading to destructive engine damages in addition to undesirable noise emissions.
By limiting the compression ratio and restricting, for instance, the use of low methane number
fuel gas, knocking combustion is, beside misfiring, one of the major limitation for increased
performances and engine development.
Knocking combustion is a stochastic process. With the same operation conditions, the knock-
intensity is changing from cycle to cycle and from cylinder to cylinder, making a cylinder
individual analysis necessary for best performances.
These 3 head-lines point out the key role taken by the knock control in today’s spark-ignited
engine management. It must accurately detect knock of each cylinder individually and main-
tain an optimal operation under all conditions while protecting the engine from every damage.
Performance and Protection, these words have been the heart of the design for ARIADNE,
HEINZMANN’s Knock Control System (↑ Figure 1). With ARIADNE on board, HEINZ-
MANN will give you the thread to guide you in your quest for improved engine performances
and avoid the threat of knock.
Figure 1: ARIADNE, HEINZMANN’s Knock Control Unit
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