Method and device for determining a coefficient of friction of a passable supporting surface with the aid of an ego vehicle

A device for determining a coefficient of friction of a passable supporting surface with the aid of an ego vehicle, comprising:

• at least one first device for acquiring first data values, which represent a moisture level of water in a non-gaseous state in the surrounding area of the ego vehicle;
• at least one second device for checking the plausibility of the acquired, first data values by comparison with at least one second data value;
• and
• at least one third device for determining third data values, which represent the coefficient of friction of the passable supporting surface, wherein the determination takes place as a function of the plausibility check of the first data values, using the at least one second data value, wherein the first data values are acquired by measuring the moisture in the form of:
• (i) a spray, which is generated by at least one vehicle located in the surrounding area of the ego vehicle and/or by the ego vehicle, and/or (ii) in the form of swirled-up snow, which is generated by at least one vehicle located in the surrounding area of the ego vehicle and/or by the ego vehicle.

A server for determining a coefficient of friction of a passable supporting surface with the aid of an ego vehicle, comprising:

• a server arrangement configured to receive, store and process third data values;
• wherein the third data values are determined by performing the following:
• acquiring first data values, which represent a moisture level of water in a non-gaseous state in the surrounding area of the ego vehicle;
• checking a plausibility of the acquired, first data values by comparing at least one second data value;
• and
• determining the third data values, which represent the coefficient of friction of the passable supporting surface, wherein the determination takes place as a function of the plausibility check of the first data values, using the at least one second data value wherein the first data values are acquired by measuring the moisture in the form of:
• (i) a spray, which is generated by at least one vehicle located in the surrounding area of the ego vehicle and/or by the ego vehicle, and/or (ii) in the form of swirled-up snow, which is generated by at least one vehicle located in the surrounding area of the ego vehicle and/or by the ego vehicle.