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:
Oct. 15, 2013
Filed:
May. 25, 2010
Andreas Paa, Winnenden, DE;
Michael Harrer, Stuttgart, DE;
Andreas Paa, Winnenden, DE;
Michael Harrer, Stuttgart, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
A two-stroke engine () has a cylinder () defining a combustion chamber () delimited by a piston (). The piston () drives a crankshaft () which is rotatably journalled in a crankcase (). The crankcase () is connected to the combustion chamber () via a transfer channel () at at least one position of the piston. The two-stroke engine has an inlet () into the crankcase () and an outlet () from the combustion chamber. There is an arrangement to supply fuel, a control, and a device to determine the crankcase pressure (p). A method to operate the two-stroke engine () includes determining the crankcase pressure (p) during every engine cycle. The fluctuation in the crankcase pressure (p) is determined and the fluctuation is compared to a limit value (Δp) to determine whether a combustion occurs during every engine cycle. In this way, a determination can be reliably made as to whether the two-stroke engine is running in a four-stroke mode.