Hoerbiger Kompressortechnik Holding Gmbh

Saab-scania Ab

Anders Göras

Hans Johansson

Jakob Olofsson Ängeby

Jan Nytomt

Tomas Carlsson

Christian Sörqvist

Henric Andersson

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

Apparatus for sensing the relative position between a fixed first machine component and an axially displaceable and pivotably mounted second machine component includes first and second bar-shaped magnets disposed at mutually right angles and rigidly connected to the second machine component, each of the magnets having a free pole; and a plurality of transducers rigidly connected to the first machine component and facing the free poles of the magnets for sensing the magnetic field of said magnets. At each long side of each of the first and second magnets an adjacent magnet disposed in parallel with the respective first or second magnet, each of these adjacent magnets having a free pole disposed in the vicinity of the free pole of the respective first or second magnet. The free poles of the first and the second magnets have a polarity reverse to that of the free poles of the adjacent magnets, and each magnet has opposite to its free pole a second pole directed away from the transducers. At least the second poles of the mutually parallel magnets are magnetically connected. The location and the orientation of the magnets causes the extension of the magnetic field at the free poles of the first and second magnets to be restricted.

Arrangement in a magnetic position indicator

Growing community of inventors

Åmål, Sweden

Anders Göras