Hoerbiger Kompressortechnik Holding Gmbh

Mecel Aktiebolag

Jan Nytomt

Jakob Olofsson Ängeby

Tomas Carlsson

Anders Göras

Christian Sörqvist

Henric Andersson

Urban Forsell

This invention relates to a method for knock detection in a combustion engine, in which combustion is controlled by a control unit (), which comprises the steps of, a) obtaining at least one sensor signal (') carrying information of knock intensity related within a combustion chamber of the combustion engine (); (b) processing the sensor signal (&#x2032;) to obtain a knock intensity related detection variable (z), (c) using said detection variable (z) in said control unit () arranged to avoid a knocking condition in said combustion engine (), if the value (z) of said detection variable indicates knock when compared with a threshold value (T) wherein using two different computations/processes for said processing () of the at least one sensor signal (&#x2032;) to obtain two separate sub-values (y, y), and thereafter combining said sub-values (y, y) to obtain said detection variable (z).

Method and system for knock detection

This invention relates to a method in connection with engine control, wherein a combustion feedback signal is derived by measuring one or more combustion related parameters during a chosen time period of a first combustion cycle, for control of a possible fault, wherein at least one reference feature for said parameters has been determined previously, and comparing said measured combustion feed back signal with said reference feature for automatic adaptation of at least one combustion related variable during a forthcoming combustion cycle wherein at least one reference features for each one of at least two different fault situations having been determined previously, and that a diagnosis of said first combustion cycle is performed on the basis of said combustion feedback signal being processed and compared (T -T ) with each one of said reference features, the result of which is analysed by a decision logic, whereafter a diagnosis (D) is established by means of which one or more variables in a forthcoming combustion cycle is/are regulated in dependence of the outcome (D) of said diagnosis, thereby achieving fault tolerant engine control.

Method in connection with engine control

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Åmål, Sweden

Jan Nytomt