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

摘要

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, nT2) at the future point in time (tT1, tT2), on the basis of the later point in time (t02, t12), thus determining whether the theoretical rotational speed (nT1, nT2) actually occurred before the future point in time (tT1, tT2) or not until afterwards.

主权项

1. A method for predicting a rotational speed of a driveshaft of an internal combustion engine, the method comprising:
determining a past rotational speed of the driveshaft, determining a theoretical rotational speed of the driveshaft at a future point in time based on a change in the rotational speed between two past events which are temporally spaced apart, which are each assigned a rotational speed and a point in time, namely a first point in time and a second point in time, respectively, wherein the first point in time is an earlier point in time and the second point of time is a later point in time and before the future point in time, and a gradient for a time period between the two past events.