Optical engine knock sensor
AssigneeRobert Bosch GmbH
InventorsHelmut Maurer, Franz Rieger, Klaus Muller, Ernst Linder
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Abstract
To detect detonations in the combustion chamber of an internal combustion engine, the sensor system is constructed as a unit that may be threadedly engaged with the combustion chamber wall, the unit including an antechamber in the region near the combustion chamber and a detector being disposed at the base of the antechamber. The sensor system further may be equipped with a heater for burning off contaminations. In a further embodiment, at least one filter disc is disposed in front of the detector, so that a selective processing of the received optical signals is possible.
Claims11
A sensor system for detecting oscillations occurring during detonations in an internal combustion engine, having at least one optical detector positioned in the combustion chamber of the engine comprising
- a threaded housing for threaded engagement in the combustion chamber wall;
- a window (5) transparent to light closing off the housing;
- an optical detector (10) being disposed in the housing and behind said window (5) in optically coupled relation thereto;
- and a heater (7) located in front of the window (5) for burning off contaminating deposits forming on the window.
Dependencies are inferred from the claim text.