System for calculating and collecting a road usage charge for a motor vehicle (1) powered by a drive unit (3), comprising a first
control unit (20) arranged in or on the motor vehicle (1) and a second
control unit (30) arranged outside the motor vehicle (1), wherein the first
control unit (20) can exchange data with the second control unit (30), wherein the first control unit (20) generates a characteristic value dependent on actual
energy consumption and / or actual exhaust emissions from data of the drive unit (3) during operation of the drive unit (3) and continuously stores it in a writable intermediate memory (23) of the first control unit (20), which reflects an environmental
impact actually caused by the operation of the drive unit (3) in a defined time interval,wherein the first control unit (20) transmits the current value of the stored parameter to the second control unit (30) as part of the
data exchange and clears the intermediate memory (23) after
successful transmission of the parameter to the second control unit (30), and wherein the second control unit (30) calculates a road usage charge payable by the owner or driver of the motor vehicle (1) for that motor vehicle (1) for the time interval, characterized in that a first control unit (20) arranged in or on the motor vehicle (1) and a second control unit (30) arranged outside the motor vehicle (1) comprise, wherein the first control unit (20) can exchange data with the second control unit (30),wherein the first control unit (20) generates a
data set dependent on actual
energy consumption and / or actual exhaust emissions from data of the drive unit (3) during operation of the drive unit (3) and continuously stores it in a writable intermediate memory (23) of the first control unit (20), which represents an environmental
impact actually caused by the operation of the drive unit (3) in a defined time interval, wherein the second control unit (30) transmits a formula to the first control unit (20) at the beginning of the
data exchange, according to which the first control unit (20) generates a characteristic value for the time interval to be evaluated within the framework of this
data exchange from the current values of the stored
data set, wherein the first control unit (20) transmits the generated characteristic value to the second control unit (30) and clears the intermediate memory (23) after
successful transmission of the characteristic value to the second control unit (30),and wherein the second control unit (30) uses the transmitted parameter to calculate a road usage charge payable by the owner or driver of the motor vehicle (1) for that motor vehicle (1) for the time interval.