| US 7,516,732 B2 | ||
| Method for detecting the beginning of combustion in an internal combustion engine | ||
| Reinhold Hagel, Pinzberg (Germany); Mehmet Tuna, Fuerth (Germany); and Ernst Meyer, Weissenohe (Germany) | ||
| Assigned to Conti Temic microelectronic GmbH, Nuremberg (Germany) | ||
| Appl. No. 10/587,929 PCT Filed Jan. 20, 2005, PCT No. PCT/DE2005/000070 § 371(c)(1), (2), (4) Date Aug. 01, 2006, PCT Pub. No. WO2005/075804, PCT Pub. Date Aug. 18, 2005. |
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| Claims priority of application No. 10 2004 005 325 (DE), filed on Feb. 04, 2004. | ||
| Prior Publication US 2008/0127945 A1, Jun. 05, 2008 | ||
| Int. Cl. F02P 5/15 (2006.01) | ||
| U.S. Cl. 123—406.58 [123/406.65; 123/406.59; 123/436] | 10 Claims |
| 1. A method for detecting the beginning of combustion in an internal combustion engine (1) having several cylinders (2, 3, 4, 5), from a rotation speed signal determined for a shaft (6) of the internal combustion engine (1), in which
at least one segment signal (SS), whose signal length corresponds to an integral multiple of one or more full rotations of
the shaft (6), is extracted from the rotation speed signal, so that each cylinder (2, 3, 4, 5) ignites one time in the rotation angle range represented by the signal length,
a cylinder signal (ZS1, ZS2, ZS3, ZS4), which substantially reproduces the operational state in one of the cylinders (2, 3, 4, 5), is generated from the segment signal (SS),
the cylinder signal (ZS1, ZS2, ZS3, ZS4) is transformed into a cylinder frequency signal (FS 1, FS2, FS3, FS4) in an angle frequency range,
a signal information indicating the beginning of combustion in the associated cylinder (2, 3, 4, 5) is extracted from the cylinder frequency signal (FS 1, FS2, FS3, FS4) at least one predefined angle frequency with regard to amplitude and phase values associated with the predefined angle frequency,
and
the beginning of combustion is detected from the signal information.
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