Patent · US Active

Method for starting a combustion engine

US10774804B2 · kind B2 · utility

0Cited by

1References

18Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Clemens Klatt · Winnenden, DE
Johannes Lang · Bad Wildbad, DE
Michael Unterkircher · Uhingen, DE
Ulf Bannick · Ahlefeld-Bistensee, DE

Key dates

Filing date	Aug 5, 2019
Grant date	Sep 15, 2020
Priority date	—
Expiry date	Aug 5, 2039

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02N2200/022
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method is for the safe starting of a combustion engine in a handheld, portable work apparatus. When starting, start rpm limiting is activated when the rotational speed of the combustion engine exceeds an activation rotational speed that lies above the coupling rotational speed of a centrifugal coupling. After activating the start rpm limiting for at least one working cycle, an intervention in the ignition is carried out such that the rotational speed of the combustion engine decreases. After the rotational speed has decreased below a lower engagement rotational speed, an intervention in the ignition is carried out such that the rotational speed increases. If the rotational speed exceeds an upper engagement rotational speed, an intervention in the ignition is again carried out such that the rotational speed decreases. The upper engagement rotational speed and/or the lower engagement rotational speed is/are changed with an increasing number of consecutive working cycles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.