The method (1) that the present invention relates to a kind of for determining the residual volume of liquid flavoring substances in air freshener for vehicle, wherein during flavouring circulation, throughput passes through the surface of liquid flavoring substances, so that a certain amount of flavoring substances are transported in automotive interior from the air freshener for vehicle. The cycle duration for determining the flavouring circulation in step (5) is determined in the duration, and the running parameter of the air freshener for vehicle set during flavouring circulation is determined in parameter determination (3). After the parameter determination (3), in selection step (6), the consumption of the flavoring substances per unit time is selected from data set (10) according to identified running parameter, then in intermediate computations step (7), the consumption volume of flavoring substances described in the working cycles is calculated as the product of the consumption Yu the cycle duration. In the final calculating step (8) after the intermediate computations step (7), the residual volume is calculated as the difference between the residual volume and the consumption volume. The invention further relates to a kind of air freshener for vehicle with for determining the device of residual volume, wherein for determining that the described device of residual volume is configured and/or is programmed to carry out method (1).
