Vehicle and method for operating a clutch as a starter element

A vehicle, comprising:

• a drivetrain of which a clutch, in particular a wet-running multi-disc clutch, is connected as a starter element between an internal combustion engine and a transmission, having a clutch controller, which, as a function of current driving operation parameters, determines a setpoint clutch torque and actuates a clutch actuator with a manipulated variable correlating with the setpoint clutch torque, in order to set at the clutch an actual clutch torque, which manipulated variable is determined as a function of the setpoint clutch torque and a coefficient of friction stored in the clutch controller in an actuation unit of the clutch controller, and having an engine controller, which determines an actual engine rotational speed and an actual engine torque, and, in a stationary state of the vehicle with the internal combustion engine running, regulates the actual engine rotational speed to a predefined idling rotational speed, wherein an adaptation device is assigned to the clutch controller, and, in the presence of a stationary state of the vehicle with the internal combustion engine operating in the idling mode, starts a coefficient-of-friction adaptation operation, in which, as a function of a checking clutch torque and a checking coefficient of friction, a checking manipulated variable is applied to the clutch actuator, and, in fact, is applied with an increase in the actual engine torque to a checking engine torque, while maintaining the actual engine rotational speed that is regulated to the idling rotational speed, and wherein the adaptation device has an analysis unit, which, from the checking engine torque, from the checking manipulated variable, and from the idling engine torque that is produced in the stationary state of the vehicle with a completely opened or disengaged clutch, calculates an adapted coefficient of friction, which can be stored in the clutch controller instead of the checking coefficient of friction.