Method for identifying belt slip in a starting system comprising bisg

A method for identifying belt slip in a starting system for starting an internal combustion engine of a motor vehicle, the starting system having a belt-driven integrated starter-generator (BISG), and having an active tensioner that can actuate a belt between a position for low tension and a position for high tension, the method comprising:

• defining a first threshold value of the belt-driven integrated starter-generator, the first threshold value is defined as a torque value of the belt-driven integrated starter-generator;
• determining a first torque value of the BISG;
• switching the active tensioner from the position for low tension to the position for high tension for a first predetermined period of time if the determined first torque value is above the first threshold value;
• and
• updating the first threshold value to a second threshold value for a second predetermined period of time following the first predetermined period of time.