Engine oil leak test method with egr valve leak offset

G - Physics – 01 – M

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G01M 15/09 (2006.01) G01M 3/28 (2006.01) G01M 15/10 (2006.01)

Patent

CA 2572229

A method for pressure testing an engine to detect possible oil seal leaks. The engine is charged with a predetermined pressure while air pressure is also applied to an EGR valve intake port to offset leakage inherent in the EGR valve. Thereafter, a pressure drop in the engine pressure is used to determine whether an oil seal leak may be present. Applying pressurized air to the EGR valve intake port compensates for EGR valve leakage and prevents the EGR valve leakage from masking possible oil seal leaks, thereby making the system more sensitive to such potential oil seal leaks.

Il s'agit d'une méthode d'essai de mise en pression d'un moteur pour détecter les fuites d'huile possibles. Le moteur est chargé d'une pression prédéterminée; en même temps, une pression d'air est aussi appliquée à l'orifice d'entrée d'une soupape RGE pour compenser la fuite inhérente à la soupape RGE. Par la suite, une baisse de pression du moteur sert d'indicateur pour déterminer s'il y a une fuite d'huile. L'application d'air pressurisé à l'orifice d'entrée de la soupape RGE compense la fuite de la soupape RGE et évite que la fuite de la soupape RGE masque toute fuite d'huile possible, rendant ainsi le système plus sensible à ce genre de fuites d'huile potentielles.

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