Andreas Stihl Ag Co. Kg

Manuel Dangelmaier

Tim Gegg

Harald Schliemann

Wolfgang Layher

Felix Mayer

Andreas Neubauer

Stefan Kummermehr

Clemens Klatt

Jens Riehmann

David Günther

Thomas Sonnenkalb

Gordon Groskopf

Armin Koelmel

A generator provides a supply voltage for an electrical consumer. It includes an internal combustion engine driving the generator. An electrical control unit has an incoming electrical line for supplying an operating voltage thereto. The control unit further has at least one outgoing electrical line. The outgoing electrical line is connected to at least one operating unit that is necessary for operating the internal combustion engine. In order to switch off the internal combustion engine in the event of an increased CO concentration in the vicinity of the generator, a breaker is arranged in an electrical line of the control unit. The breaker is controlled by a CO sensor, which is designed to open the breaker and interrupt the electrical line when a predeterminable CO limit value is exceeded.

Internal combustion engine with a generator and a carbon monoxide sensor

A mixture-lubricated four-stroke engine has a cylinder and a piston. On the piston, at least one piston ring is arranged. Between valve drive chamber and crankcase interior, at least one first channel is arranged. The first opening of the first channel lies in the bottom dead center position of the piston below each piston ring. At the first opening, the first channel defines a first middle flow direction for mixture flowing into the crankcase interior. The first middle flow direction extends inclined towards the combustion chamber and in a viewing direction perpendicular to the cylinder longitudinal plane intersects the longitudinal center axis above the first opening of the first channel.

Mixture-lubricated four-stroke engine

A suction head for connection to a fuel hose in a fuel tank has a base member made of an injection molding material. The base member has a peripheral wall surface provided with cutouts and also has an end face opening. A cap closes off the end face opening. A connecting socket for the fuel hose is provided on the suction head. A first filter element is received inside the base member. A second filter element covering the cutouts is provided and is made of a filter fabric, wherein the filter fabric is a twill weave fabric or a satin weave fabric. The filter fabric has a mesh size that is greater than 10 &#x3bc;m and smaller than 25 &#x3bc;m. A power tool with a four-stroke engine is provided with such a suction head in the fuel tank.

Suction head for connection to a fuel hose

A handheld work apparatus has a combustion engine () for driving a tool. The combustion engine () has an ignition device, a device for metering fuel and a control device (). The control device () engages when an engagement speed (n, n) is reached, in order to limit the speed (n) of the combustion engine (). In order to allow the speed (n) to be set in an easy manner at full throttle, the work apparatus has a device for setting the engagement speed (n) by the user.

Handheld work apparatus

A work apparatus has an internal combustion engine and a starter device for starting the engine. Within a housing of the work apparatus, a first electrical component is arranged at a first location and a second electrical component is arranged at a second location. A control unit is provided which is connected to the first electrical component and to the second electrical component. The control unit detects a first temperature-dependent value of the first electrical component at the first location, and a second temperature-dependent value of the second electrical component at the second location, and identifies the starting conditions as a function of these values. The first electrical component is a first actuator and the second electrical component is a second actuator or a sensor.

Work apparatus and method for determining the starting conditions thereof

A method controls the rpm of a combustion engine in a hand-held work apparatus such as a brushcutter. The engine drives a work tool via a clutch which engages as a function of the engine rpm (n). A spark plug is arranged in the combustion chamber and is driven by an ignition unit. During start of the engine, an rpm lock circuit is active and defines a control variable as a function of the instantaneous rpm (n) of the engine. According to the magnitude of this control variable, operating parameters of the engine are adapted to change the instantaneous rpm (n). A control variable is determined for the adaptation of the operating parameters by the rpm lock circuit. The switch-off of the rpm lock circuit is provided when the control variable of the control lies outside a predetermined bandwidth of the absolute magnitude of the control variables.

Method for switching off a rotational speed limit in an internal combustion engine

An internal combustion engine () has an ignition device, a device for supplying fuel and a device for detecting the rpm of the engine (). The engine () includes a permissible limit rpm (n) and a control range (A) of the rpm (n) above the limit rpm (n). A method for operating the engine () provides that the rpm of the engine () is limited in the control range (A) because of suppression of the ignition in individual engine cycles wherein the rpm (n) lies above a control rpm (n) lying in the control range (A). In the control range, and to improve the exhaust-gas values, the noncombustion engine cycle ratio (NECR) is adjusted. The NECR indicates the ratio of the number of engine cycles wherein the ignition is suppressed to the total number of ignitions.

Growing community of inventors

Plochingen, Germany

Manuel Dangelmaier