| US 7,552,714 B2 | ||
| Ignition device for an internal combustion engine and method for its operation | ||
| Georg Maier, Kernen i.R. (Germany); Wolfgang Layher, Besigheim (Germany); Thomas Neumaier, Waiblingen (Germany); Eberhard Schieber, Backnang (Germany); and Mohamed Abou-Aly, Waiblingen (Germany) | ||
| Assigned to Andreas Stihl AG & Co. KG, Waiblingen (Germany) | ||
| Filed on Aug. 14, 2007, as Appl. No. 11/838,606. | ||
| Claims priority of application No. 10 2006 038 276 (DE), filed on Aug. 16, 2006. | ||
| Prior Publication US 2008/0053407 A1, Mar. 06, 2008 | ||
| Int. Cl. F02P 5/06 (2006.01); F02P 5/00 (2006.01) | ||
| U.S. Cl. 123—406.58 | 37 Claims |
| 1. An ignition device for a motor unit comprising an internal combustion engine, wherein the internal combustion engine of
the motor unit comprises a piston, a combustion chamber with a spark plug, a crankshaft that is driven in rotation by the
piston, an intake port for supplying combustion air into the combustion chamber, an exhaust for removing combustion gases
from the combustion chamber, an alternator that is driven in rotation by the crankshaft and attached to the motor unit, wherein
the alternator supplies electric energy to electric consumers and, for one crankshaft revolution, emits sequential alternating
voltage signals; the ignition device comprising:
an ignition unit that triggers a spark at the spark plug at a preselectable timing;
wherein the ignition unit is a module that is separate from the motor unit;
wherein an electric alternating voltage signal generated by the alternator is supplied by a single line to the ignition unit;
and
wherein the ignition unit comprises a first unit for energy processing and a second unit for processing information for control
of the internal combustion engine, wherein the alternating voltage signal is supplied to said first and second units;
wherein an angle information signal that angle-precisely correlates a mechanical crankshaft angle position to the alternating
voltage signal is derived from the alternating voltage signal as an information signal sufficient for operating the internal
combustion engine.
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