Air supply to an internal combustion engine and method and device for diagnosing an air supply to an internal combustion engine

A method for diagnosing an air supply, comprising:

• providing an air supply to an internal combustion engine which has at least one cylinder and a heater of an exhaust system, the air supply including:
• a first air duct configured to supply air to the at least one cylinder of the internal combustion engine for operating the internal combustion engine;
• and
• a second air duct configured to supply air to a heater configured to heat an exhaust gas system of the internal combustion engine, wherein the first and second air ducts are connected to an air filter by a third air duct, for providing filtered ambient air to the internal combustion engine, each respective air duct of the first and the second air ducts having at least one control element for controlling a quantity of air flowing through the respective air duct, and each air duct of the first and the third air ducts having a mass flow sensor for measuring a mass of the air flowing through the air duct.

A device for diagnosing an air supply an air supply to an internal combustion engine which has at least one cylinder and a heater of an exhaust system, the air supply including:

• a first air duct configured to supply air to the at least one cylinder of the internal combustion engine for operating the internal combustion engine;
• and
• a second air duct configured to supply air to a heater configured to heat an exhaust gas system of the internal combustion engine, wherein the first and second air ducts are connected to an air filter by a third air duct, for providing filtered ambient air to the internal combustion engine, each respective air duct of the first and the second air ducts having at least one control element for controlling a quantity of air flowing through the respective air duct, and each air duct of the first and the third air ducts having a mass flow sensor for measuring a mass of the air flowing through the air duct;
• wherein the device is configured to control and diagnose the air supply.