Process for recognizing the ignition cycle of a certain cylinder during the start of an internal-combustion engine
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorNorbert Siegl
Life of this patent
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Abstract
In the case of a process for recognizing the ignition cycle of a defined cylinder during the start of an internal-combustion engine in motor vehicles using a crankshaft angle sensor which interacts with a crankshaft generator gear equipped with teeth and with a reference mark, a camshaft angle sensor for differentiating between the ignition cycle and the exhaust cycle of the cylinders, and an electronic control unit, the high levels and the low levels as well as the descending and the ascending edges of the signal of the camshaft angle sensor are analyzed in the control unit and are related to the signal of the crankshaft sensor.
Claims6
A process for recognizing an ignition cycle of a defined cylinder during a start of an internal-combustion engine, the process comprising the acts of:
- determining a crankshaft signal via a crankshaft angle sensor interacting with a crankshaft generator gear equipped with a plurality of teeth and a reference mark;
- determining a camshaft signal via a camshaft angle sensor for differentiating between the ignition cycle and an exhaust cycle of cylinders of the internal-combustion engine;
- and
- analyzing in an electronic control unit for the presence of any one of high and low levels, as well as descending and ascending edges of the camshaft signal in relation to the crankshaft signal to recognize the ignition cycle of the defined cylinder.
An arrangement for performing a process of recognizing an ignition cycle of a defined cylinder during a start of an internal-combustion engine, the arrangement comprising:
- a crankshaft generator gear provided with a plurality of teeth and a reference mark;
- a crankshaft angle sensor interacting with the crankshaft generator gear to provide a crankshaft signal;
- a camshaft generator gear having a half-segment disk shape;
- a camshaft angle sensor interacting with the camshaft generator gear to provide a camshaft signal, said camshaft generator gear being arranged relative to the crankshaft generator gear such that descending and ascending edges of the camshaft signal from the camshaft sensor each occur at least approximately after one-half a crankshaft rotation beginning with the reference mark of the crankshaft generator gear;
- and
- an electronic control unit which receives the crankshaft signal and the camshaft signal, the electronic control unit recognizing the ignition cycle of the defined cylinder based on said signals.
A software product comprising a computer readable medium having stored thereon program code segments that:
- determine a crankshaft signal via a crankshaft angle sensor interacting with a crankshaft generator gear equipped with a plurality of teeth and a reference mark;
- determine a camshaft signal via a camshaft angle sensor for differentiating between the ignition cycle and an exhaust cycle of cylinders of the internal-combustion engine;
- and
- analyze in an electronic control unit for the presence of any one of high and low levels, as well as descending and ascending edges of the camshaft signal in relation to the crankshaft signal to recognize the ignition cycle of the defined cylinder.
Dependencies are inferred from the claim text.