Patent ID: 7779819
Filing Date: 2010-08-24
Classification: F02D,F02M,F04B

Abstract:
1. Control method for an overpressure valve in a common-rail fuel supply system, the method including: delivering fuel under pressure, via a high-pressure pump, to a common rail equipped with the overpressure valve that is set to discharge the fuel present in the common rail into a discharge line when the fuel pressure inside the common rail exceeds a safety value (p determining, during a normal use, the fuel pressure inside the common rail; feedback-piloting, during the normal use, the high-pressure pump in function of the fuel pressure inside the common rail to keep the fuel pressure inside the common rail to a desired level which is always lower than the safety value (p piloting, during a diagnostic test performed with the internal combustion engine in cut-off condition, the high-pressure pump to increase the fuel pressure inside the common rail beyond the safety value (p determining, during the diagnostic test, the flow (m comparing the flow (m diagnosing malfunctioning of the overpressure valve if the flow (m