Joerg Praeger

Title: Joerg Praeger: Innovator in Combustion Engine Technology

Introduction

Joerg Praeger is a notable inventor based in Winnenden, Germany. He has made significant contributions to the field of combustion engine technology, holding 2 patents that showcase his innovative approach to engineering challenges.

Latest Patents

One of Praeger's latest patents is a method for starting a combustion engine equipped with a pull-rope starter. This method involves feeding a fuel/air mixture to the engine through an intake channel, which is ignited by a spark plug. The combustion process drives the piston downward, resulting in the rotational movement of the crankshaft. The fuel system includes a fuel channel that opens into the intake channel, with an electric fuel valve that remains open in its currentless state. The valve closes only when an operating voltage is applied. An electronic control unit manages the fuel valve and triggers the ignition spark, utilizing energy from a generator to power the control unit, fuel valve, and ignition device. To prevent excessive enrichment of the fuel/air mixture during the starting process, the energy generated at the beginning of the crankshaft's rotation is used to close the fuel valve before the ignition spark is triggered.

Another significant patent by Praeger is an arrangement for identifying the switching position of a switch on an internal combustion engine in a handheld work apparatus. This invention provides an energy source for supplying power to an inductive electrical load, which can be switched on and off via a controller. The switch is positioned in a voltage branch connected in parallel with the inductive load, where a zener diode is also included. The zener diode's activation is dependent on the switch's position. The amplitude of the switch-off voltage, induced when the inductive load is disconnected, is limited by the zener diode, allowing for the determination of whether the switch is closed or open based on the amplitude's magnitude.

Career Highlights

Joerg Praeger is currently employed at Andreas Stihl AG & Co. KG, a company renowned for its high-quality outdoor power equipment. His work at this esteemed organization has allowed him to apply his innovative ideas and contribute to advancements in engine technology.

Collaborations

Throughout his career, Praeger has collaborated with talented individuals such as Klaus Geyer and Martin Kiesner. These partnerships have fostered a creative environment that encourages the development of groundbreaking technologies.