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Overboost refers to a brief increase in the boost pressure of a supercharged engine above the normal maximum value, which is intended for continuous operation. The boost pressure is increased by the control unit and - z. B. for overtaking or for charging the battery at full load in hybrid vehicles - a higher torque is available for a certain time .

With the exhaust gas turbocharger , the boost pressure can be regulated mechanically and pneumatically (wastegate valve) or electronically (clock valve changes the opening cross-section); With the VTG loader , the overpressure is achieved by means of adjustable guide vanes.

The overboost is activated manually (see overtaking button ) or requested via the accelerator pedal position ("kick-down").

Individual evidence

  1. Overboost , Dizionario Tecnico dell'Automobilismo (ital.)
  2. Stefan Winter, Lukas Magerl, Peter Hofmann, Bernhard Geringer, Paul E. Kapus: Increasing the efficiency and dynamics of a hybrid drive train through targeted synergy measures in combination with a directly injecting, charged gasoline engine. In: Ulrich Spicher (Ed.): Direct injection in Otto engines IV. Expert-Verlag, Renningen 2007, p. 52 ff., ISBN 978-3-8169-2716-7 ( preview ).
  3. Wastegate boost pressure control , bmturbosystems.com (accessed on September 8, 2015)
  4. VTG boost pressure control , bmturbosystems.com (accessed on September 8, 2015)
  5. z. B. Porsche 911 Turbo