Quantitative mixture regulation

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With quantitative mixture regulation (or quantity regulation ), the performance of an internal combustion engine is changed by the amount ( quantity ) of the mixture supplied . In contrast to the qualitative mixture regulation , the mixture ratio of air and fuel ( combustion air ratio or air number λ) remains almost constant.

Quantitative mixture regulation in piston engines

Scheme of a throttle valve

In the classic gasoline engine with external mixture formation ( carburetor engine ), the quantity is regulated by controlling the degree of delivery via the position of the throttle valve (intake throttling or mixture throttling ). Modern gasoline engines and diesel engines with direct injection ( internal mixture formation ) are instead increasingly using a variable control time of the intake valves in order to avoid the considerable flow losses at the throttle valve. (A throttle valve is usually also installed in vehicle engines in order to close for the function of the engine brake when you take your foot off the accelerator.)

Quantitative mixture regulation in gas turbines

In the case of continuously operating gas turbines , the throughput and thus the quantity of air and mixture that determine the output are influenced by their speed . However, the qualitative mixture regulation is more common here .

Individual evidence

  1. Dubbel : Taschenbuch des Maschinenbau , 2007, p. P60: Load influence through change of filling (often also called "quantity control").

literature

  • Hans Jörg Leyhausen: The master's examination in the automotive trade part 1. 12th edition, Vogel Buchverlag, Würzburg, 1991, ISBN 3-8023-0857-3
  • Basshuysen, Schäfer (Ed.): Handbook Combustion Engine: Fundamentals, Components, Systems, Perspectives (ATZ / MTZ-Fachbuch) 7th edition, Springer-Vieweg, Wiesbaden, 2014, ISBN 978-3658046774