Method for monitoring a passive pressure regulation valve
AssigneeMTU Friedrichshafen GmbH
InventorArmin Dölker
Life of this patent
Estimating the term…
Abstract
Proposed is a method for monitoring a passive pressure limiting valve (11) via which fuel is discharged from the rail (6) of a common rail system into the fuel tank (2), in which method, upon the detection of a defective rail pressure sensor (9), a switch is made from a rail pressure regulation mode into an emergency mode, wherein in the emergency mode, the rail pressure is successively increased until the pressure limiting valve (11) reacts, in which method, in the emergency mode, the pressure limiting valve (11) is set as open when the starting phase of the internal combustion engine has additionally been detected as having ended, and in which method, in addition, the opening duration of the pressure limiting valve (11) is monitored.
Claims7
Method for monitoring a passive pressure limiting valve via which fuel is discharged from the rail of a common rail system into the fuel tank, wherein upon the detection of a defective rail pressure sensor, a switch is made from a rail pressure regulation mode into an emergency mode, wherein in the emergency mode, the rail pressure is gradually increased until the pressure limiting valve responds, wherein the pressure limiting valve is set as open in the emergency mode if the starting phase of the combustion is also detected as having ended, and wherein the opening duration of the pressure limiting valve is additionally monitored.
Dependencies are inferred from the claim text.