Method for determining an engaged ratio in a gearbox

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 59/70 (2006.01)

Patent

CA 2542733

The invention relates to a method for determining the speed of a vehicle with the aid of sensors on board said vehicle, whereby the vehicle is moved by an engine (6) coupled to a gear box (8), wherein the speed is determined by multiplying the value of the engine rpm obtained by a sensor by a predetermined coefficient as a function of the engaged gearbox ratio. The engaged gearbox ratio is determined during a change in gearbox ratio by dividing the values of the engine rpm measured just before and after the ratio change by each another and by comparing the result of said division with predetermined stored values which are dependent upon the gear box (8) with which the vehicle is fitted. The invention can be used to determine the speed of a vehicle in a degraded mode i.e. in the event of a speed sensor failure.

Ce procédé de détermination de la vitesse d'un véhicule à l'aide de capteurs embarqués à bord du véhicule, le véhicule étant mû par un moteur (6) accouplé à une boîte de vitesses (8),La vitesse est déterminée en multipliant la valeur du régime moteur obtenue par un capteur par un coefficient prédéterminé en fonction du rapport de boîte de vitesses engagé. Le rapport de boîte de vitesses engagé est déterminé lors d'un changement de rapport de boîte de vitesses en divisant l'une par l'autre les valeurs du régime moteur mesurées juste avant et juste après le changement de rapport et en comparant le résultat de cette division avec des valeurs prédéterminées mémorisées qui dépendent de la boîte de vitesses (8) équipant le véhicule. Application à la détermination de la vitesse d'un véhicule en mode dégradé, i.e. en cas de défaillance du capteur de vitesse.

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