Method for predicting a rotational speed of a crankshaft in an internal combustion engine

US9207147B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ewald Mauritz · Rutesheim, DE
• Markus Roessle · Stuttgart, DE
• Matthias Cwik · Stuttgart, DE

Key dates

• Filing date: Dec 27, 2012
• Grant date: Dec 8, 2015
• Expiry date: Dec 28, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/481
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method for predicting a rotational speed (n) of a drive shaft (16) in an internal combustion engine (13), wherein a past rotational speed (n) of the drive shaft (16) is determined, characterized in that in order to determine a theoretical rotational speed (nT1, nT2) of the drive shaft (16) at a future point in time (tT1, tT2), the change in the rotational speed (n) between two past events (P01, P11; P02, P12) occurring at different times is used, one rotational speed (n01, n11; n02, n12) and one point in time (t01, t11; t02, t12) being assigned to each event, wherein one point in time (t01, t02) is an earlier point in time and the other is a later point in time (t02, t12), which therefore lies before the predicted point in time (tT1, tT2), wherein a gradient (m) is determined for a period between the two events (P01, P11; P02, P12) and is used as the basis for deducing a theoretical future rotational speed (nT1, nT2) at the future point in time (tT1, tT2), such that in order to determine the theoretical rotational speed (nT1, nT2) of the drive shaft (16) at the future point in time (tT1, tT2), the determined gradient (m) is used to determine the theoretical rotational speed (nT1, n…