Assembly module for a motor vehicle with an optical sensor system for monitoring a detection region

A method for triggering a signal for performing an action on a motor vehicle, comprising the following steps:

• a) monitoring, using an optical sensor, a detection region lying outside the motor vehicle in order to determine the proximity of a user,
• b) performing, using the optical sensor, a measurement of the distance from the user within the detection region, and
• c) in the case of identifying the user in a predefined actuation region within the detection region triggering a signal for performing an action on the motor vehicle,
• wherein by the measurement of the distance to the user a volume of the actuation region is monitored, to ensure that body parts of the user above the actuation region do not lead to triggering of the signal, to avoid an incorrect triggering, wherein the measurement of the distance to the user provides additional information in a third dimension to a two-dimensional monitoring of the detection region, so that the measurement of the distance to the user allows, starting from a two-dimensional detection region, the volume of the actuation region to be monitored in the third dimension, wherein three-dimensional information regarding the geometric positioning of the user within the actuation region is provided, and
• wherein
• said method is for operating in an assembly module for the motor vehicle, wherein the assembly module comprises an optical sensor system comprising at least one optical sensor, wherein the optical sensor system is configured
• a) for monitoring the detection region lying outside the motor vehicle in order to determine the proximity of the user by the assembly module, wherein monitoring the detection region is performed by one of the at least one optical sensor,
• b) for measuring the distance to the user within the detection region by the assembly module, wherein measuring the distance is performed by one of the at least one optical sensor, and
• c) in the case of identifying the user in the predefined actuation region within the detection region, triggering the signal for performing the action on the motor vehicle.