The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2011
Filed:
Aug. 14, 2007
Georg Maier, Kernen i. R., DE;
Wolfgang Layher, Waiblingen, DE;
Mohamed Abou-aly, Waiblingen, DE;
Heinrich Leufen, Schwaikheim, DE;
Eberhard Schieber, Backnang, DE;
Georg Maier, Kernen i. R., DE;
Wolfgang Layher, Waiblingen, DE;
Mohamed Abou-Aly, Waiblingen, DE;
Heinrich Leufen, Schwaikheim, DE;
Eberhard Schieber, Backnang, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
In a method for detecting an operating parameter of a power tool having an internal combustion engine with a cylinder, a piston delimiting a combustion chamber in the cylinder and driving a crankshaft supported rotatably in a crankcase, an intake supplying combustion air to the combustion chamber, an exhaust removing combustion gases from the combustion chamber, and a signal generator driven in rotation by the crankshaft emitting sequential alternating voltage signals, a period duration of the voltage signal is selected to correspond to the n-th portion of a crankshaft revolution with n greater than 2. The n-th portion of the crankshaft revolution provides a crankshaft angle interval. For each crankshaft angle interval at least one information is detected that represents a course plotted against the crankshaft angle. The course is scanned with regard to characteristic features that are correlated with an operating parameter of the power tool.