LEAK DETECTION METHOD AND ASSOCIATED VALVE AND FUEL SYSTEM

摘要

Method of detecting a leak in a fuel system comprising a fuel tank and an orifice with a controlled section between the tank and the atmosphere, according to which a) the controlled section is set to a value A<SUB>1</SUB> at a time T<SUB>1</SUB> and a pressure differential ?p<SUB>1</SUB> between the inside of the tank and the atmosphere is measured at least after an interval of ? time from T<SUB>1</SUB>, for a constant fuel flow out of the tank; b) the controlled section is set to a value A<SUB>2</SUB> at a time T<SUB>2</SUB> and a pressure differential ?p<SUB>2</SUB> between the inside of the tank and the atmosphere is measured at least after the same interval of time ?T from T<SUB>2</SUB>, for the same constant fuel flow; c) a ratio of the pressure differentials ?p<SUB>1</SUB> and ?p<SUB>2</SUB> is computed and is compared to a reference pressure differential ratio ?p<SUB>L</SUB> obtained with the same fuel system but comprising a calibrated leak.