Method and control device thereto for operating a powertrain

摘要

A method for operating a drive train that includes a converter as the start-up element, an automatic transmission, and an output, whereas, after start of the drive unit, the rotational speed of a turbine of the converter is monitored, whereas, if it is determined that, within a defined first time frame after the start of the drive unit, the rotational speed of the turbine reaches or exceeds a first threshold value, a properly filled converter is inferred. If, within the defined first time frame, the rotational speed of the turbine falls short of the first threshold value, an improperly filled converter or a converter that has run empty is inferred.

主权项

1. A method for detecting an operational error in a converter used as a start-up element in a drive train, wherein the drive train includes a drive unit, a converter, an automatic transmission, a transmission control device, and an output, the method comprising:
starting the drive unit, and immediately after start of the drive unit monitoring rotational speed of a turbine of the converter with the transmission control device; with the transmission control device, determining whether, within a defined first time frame after the start of the drive unit, the rotational speed of the turbine reaches or exceeds a first threshold value; the transmission control device inferring a properly filled converter if the rotational speed of the turbine reaches or exceeds the first threshold value within the first time frame; the transmission control device inferring an improperly filled or empty converter if the rotational speed of the turbine does not reach or exceed the first threshold value; via a transmission selector lever, placing the automatic transmission in a shift position; if a properly filled converter is inferred by the transmission control device, further determining whether the rotational speed of the turbine subsequently falls short of a second threshold value for the selected shift position of the automatic transmission within a defined second time frame; and if the rotational speed of the turbine falls short of the second threshold value, the transmission control device infers a frictional connection error in the automatic transmission.