Patent ID: 6658359
Filing Date: 2003-12-02
Classification: F01M,F16N,G01N

Abstract:
A method for determining the viscosity of an operating liquid of an internal combustion engine of a vehicle by establishing a measured level of the operating liquid, comprising the following steps:acquiring a first signal that corresponds to a variation against time of the measured level, acquiring a second signal that corresponds to a variation against time of a state of the vehicle that has an influence on the measured level of the operating liquid, feeding the first and second signals to a filter and filtering the first and second signals to allow the first and second signals to be analyzed with respect to the dynamic response thereof, resulting in a third signal and a fourth signal being generated, comparing the fourth signal with a threshold value, and forming a ratio relating the fourth signal to the third signal according to a result of the comparing, and determining a mean value over a plural number of values of the ratio, wherein the mean value corresponds to the viscosity of the operating liquid.