Rotation angle detector, injection system and corresponding operating method
AssigneeSiemens Aktiengesellschaft
InventorUwe Lingener
Life of this patent
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Abstract
A rotation angle detector for detecting the angular position of a shaft, i.e. a camshaft or a camshaft of an internal combustion engine, includes a rotatable detector wheel coupled to the shaft. Markings of a first type are distributed along a periphery of the detector wheel and are detectable by a sensor for determining a relative rational angle. Markings of a second type are also distributed over the periphery of the detector wheel. The markings of the second type are distinguishable from each other for determining an absolute rotational angle of the shaft or for determining selection of a combustion chamber for injection.
Claims15
A rotation angle detector for detecting an angular position of a shaft, comprising:
- a detector wheel mechanically connectable to the shaft for rotating with the shaft;
- first markings distributed over a periphery of said detector wheel, said first marking facilitating a determination of a relative rotation angle of said detector wheel;
- second markings distributed over the periphery of said detector wheel, said second markings facilitating determination of an absolute rotation angle of the detector wheel;
- and
- a detector for detecting said first markings and said second markings during rotation of said detector wheel, wherein each of said second markings is distinguishable from the others of said second markings such that the absolute rotation angle of the detector wheel is determinable in response to detection of only one of said second markings.
A combination including an injection system for an internal combustion engine and a rotation angle detector for detecting an angular position of a shaft, said injection system being responsive to said rotation angle detector, wherein said rotation angle detector comprises:
- a detector wheel mechanically connectable to the shaft for rotating with the shaft;
- first markings distributed over a periphery of said detector wheel, said first marking facilitating a determination of a relative rotation angle of said detector wheel;
- second markings distributed over the periphery of said detector wheel, said second markings facilitating determination of an absolute rotation angle of the detector wheel;
- and
- a detector for detecting said first markings and said second markings during rotation of said detector wheel, wherein each of said second markings is distinguishable from the others of said second markings such that the absolute rotation angle of the detector wheel is determinable in response to detection of only one of said second markings.
A method for operating an injection system of an internal combustion engine having a rotation angle detector for detecting an angular position of a shaft, the rotation angle detector having a detector wheel mechanically connectable to the shaft for rotating with the shaft, first markings distributed over a periphery of the detector wheel, the first marking facilitating a determination of a relative rotation angle of the detector wheel, second markings distributed over the periphery of the detector wheel, each of the second markings being distinguishable from the others of said second marking for facilitating determination of an absolute rotation angle of the detector wheel, and a detector for detecting the first markings and the second markings during rotation of the detector wheel, said method comprising the steps of:
- detecting the first markings during rotation of the shaft;
- defining the injection timing by the frequency of the detections of the first markings;
- detecting the second markings during rotation of the shaft and determining an absolute rotation angle of the detector wheel in response to detection of only one of the second markings;
- selecting a combustion chamber of the internal combustion engine for injecting fuel in response to the determination of said absolute rotation angle of the detector wheel;
- and
- injecting fuel into the selected combustion chamber using the timing determined by detection of the first markings.
Dependencies are inferred from the claim text.