System for regulating the amount of antifreeze in a motor vehicle windscreen washing system in which the freezing point of a washing liquid sample is measured, compared with a reference and used to add antifreeze if necessary

摘要

Method has the following steps: (a) Cooling of a sample of liquid until it freezes;determination of the freezing temperature of the sample (b) comparison of the freezing temperature with a reference temperature (c) addition of antifreeze when the freezing temperature is greater than or equal to the reference temperature. The invention also relates to a corresponding unit for implementation of the method and a corresponding motor vehicle windscreen washing system.