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1. (WO2018002551) METHOD AND SYSTEM FOR DETECTING THE ABSENCE OF UNDER ENGINE PROTECTION

Pub. No.:    WO/2018/002551    International Application No.:    PCT/FR2017/051766
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat Jul 01 01:59:59 CEST 2017
IPC: F01P 1/06
B60K 11/06
B62D 25/20
Applicants: CONTINENTAL AUTOMOTIVE FRANCE
CONTINENTAL AUTOMOTIVE GMBH
Inventors: CAILLER, Lionel
ELOY, Stéphane
Title: METHOD AND SYSTEM FOR DETECTING THE ABSENCE OF UNDER ENGINE PROTECTION
Abstract:
The invention relates to a method for diagnosing the absence of an under engine protection (110) of a motor vehicle (100) comprising the following steps: estimating (210) an air temperature (Text) outside the vehicle; estimating (220) a temperature under the bonnet (Tscm); determining (230) whether the outside air temperature value is lower than the temperature value under the bonnet; if so, calculating (240) an absolute value (abs) of a difference between the outside air and under bonnet temperature measurements; determining (250) a diagnosis criterion (C) by calculating a difference between said absolute value and a predetermined absolute value obtained in the presence of the under engine protection; comparing (260) the diagnosis criterion with a predetermined diagnosis threshold; and emitting (270) a diagnosis signal that is dependent on the result of the comparison.