Method for ascertaining a torque accuracy of a torque transmitted from a belt-driven starter-generator of an internal combustion engine to the internal combustion engine

Patent metadata

Field	Value
Publication number	US-10557449-B2
Application number	US-201615746152-A
Country	US
Kind code	B2
Filing date	Jun 15, 2016
Priority date	Jul 22, 2015
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A method for ascertaining a torque accuracy of a torque transmitted from a belt-driven starter-generator of an internal combustion engine to the internal combustion engine, which is similar to a learning process or a calibration of the actual torque of the starter-generator with respect to a setpoint torque, includes controlling the belt-driven starter-generator to transmit a specified test torque to the internal combustion engine during a predefined test time interval during coasting down of the internal combustion engine, determining a speed variable that is dependent on a speed of the internal combustion during the test time interval, comparing the speed variable to a reference variable, and deducing the torque accuracy from this comparison.

First claim

What is claimed is:

1. A method for controlling a belt-driven starter generator of an internal combustion engine, the method comprising:
during a predefined test time interval during coasting down of the internal combustion engine:
controlling, by a processor, the belt-driven starter generator to provide to the internal combustion engine a specified test torque; and
determining, by a processor, a speed variable that is a function of a speed of the internal combustion engine;

comparing, by the processor, the determined speed variable to a reference variable;
deducing, by the processor and based on a result of the comparison, a torque accuracy at which the belt-driven starter generator provides torque to the internal combustion engine relative to setpoints specified by the processor; and
based on the deduced torque accuracy, the processor controlling the belt-driven starter generator, wherein a check is carried out as part of the comparison between the determined speed variable and the reference variable to determine whether the speed of the internal combustion engine decreases according to a predefined reference curve during the test time interval.

2. The method of claim 1 , wherein the deduced torque accuracy is insufficient, and the controlling based on the deduced torque accuracy includes correcting the torque transmitted from the belt-driven starter-generator.

3. The method of claim 1 , wherein, the comparison indicates that the speed of the internal combustion engine is not decreasing according to the predefined reference curve during the test time interval, and the deducing therefore is that the torque accuracy is insufficient.

4. The method of claim 1 , wherein a statistical evaluation of a plurality of determined speed variables is carried out.

5. The method of claim 4 , wherein a time series analysis of the plurality of determined speed variables is carried out.

6. The method of claim 1 , wherein the evaluated speed variable is checked for plausibility with the aid of statistical functions.

7. The method of claim 1 , wherein the speed of the internal combustion engine is determined as the speed variable.

8. A non-transitory computer-readable medium on which are stored instructions that are executable by a processor and that, when executed by the processor, cause the processor to perform a method for controlling a belt-driven starter generator of an internal combustion engine, the method comprising:
during a predefined test time interval during coasting down of the internal combustion engine:
controlling the belt-driven starter generator to provide to the internal combustion engine a specified test torque; and
determining a speed variable that is a function of a speed of the internal combustion engine;

comparing the determined speed variable to a reference variable;
deducing, based on a result of the comparison, a torque accuracy at which the belt-driven starter generator provides torque to the internal combustion engine relative to setpoints specified by the processor; and
based on the deduced torque accuracy, the processor controlling the belt-driven starter generator, wherein a check is carried out as part of the comparison between the determined speed variable and the reference variable to determine whether the speed of the internal combustion engine decreases according to a predefined reference curve during the test time interval.

9. A device for controlling a belt-driven starter generator of an internal combustion engine, the device comprising:
processing circuitry interfacing with the belt-driven starter generator, wherein the processing circuitry is configured to:
during a predefined test time interval during coasting down of the internal combustion engine:
control the belt-driven starter generator to provide to the internal combustion engine a specified test torque; and
determine a speed variable that is a function of a speed of the internal combustion engine;

compare the determined speed variable to a reference variable;
deduce, based on a result of the comparison, a torque accuracy at which the belt-driven starter generator provides torque to the internal combustion engine relative to setpoints specified by the processor; and
based on the deduced torque accuracy, control the belt-driven starter generator, wherein a check is carried out as part of the comparison between the determined speed variable and the reference variable to determine whether the speed of the internal combustion engine decreases according to a predefined reference curve during the test time interval.

Assignees

• Seg Automotive Germany Gmbh

Inventors

• Klein Benjamin
• Trzebiatowski Tobias
• Greis Andreas
• Schroeder Bernd
• Deak Istvan
• Kaepple Mario
• Henger Martin

Classifications

• F02N11/04

  the motors being associated with current generators · CPC title

• F02D41/22

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02N2200/14

  said parameter being related to wear of starter or other components, e.g. based on total number of starts or age · CPC title

• F02N11/0814

  comprising means for controlling automatic idle-start-stop · CPC title

• F02N2200/022

  Engine speed · CPC title