DrehzahlLastfenster

DrehzahlLastfenster is a term used in engine development and calibration to describe a two‑dimensional region of operation defined by engine speed (Drehzahl) and engine load (Last). It represents a portion of the engine map where data are collected, analyzed, and used to tune control strategies. The concept helps engineers focus on representative conditions for performance, efficiency, and emissions.

The window is defined along two axes: Drehzahl, commonly given in revolutions per minute (U/min), and Last, often expressed as a percentage of maximum torque or a corresponding load parameter. Typical definitions specify minimum and maximum values for both axes, creating a rectangular or irregular shape within the full operating envelope. This enables targeted testing and calibration in the most relevant operating regions, such as during acceleration, cruising, or steady-state operation.

Applications of a DrehzahlLastfenster include ECU calibration, fuel injection timing, ignition timing, boost control, exhaust aftertreatment strategies, and torque management. Data collected within the window support map generation, interpolation, and validation, ensuring that control laws behave reliably under common driving conditions and load demands. It is common to use this window in combination with driving cycles to balance performance, fuel economy, and emissions.

Limitations should be noted: the window covers only a subset of the full operating envelope and may miss transient phenomena or extreme conditions. Thus, designers may define multiple windows or supplement with transient tests to achieve comprehensive coverage.