Fuel pressure sensor diagnosing device and method

• Main Authors: HANARI AKIRA, YOMOGIDA KOUICHIROU
• Format: Patent
• Language: English
• Published: 20.04.2010
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

A fuel pressure sensor diagnosing device for diagnosing a fuel pressure sensor for detecting pressure in a common rail in which a high-pressure fuel to be supplied to an engine is accumulated, the device comprising: fuel temperature detection for detecting fuel temperature; and failure determination, provided with the fuel temperature detection for detecting fuel temperature via subsequent to stopping of the engine, for obtaining a resting and stabilization time between when the pressure in the common rail drops and when the pressure stabilizes on the basis of this detected fuel temperature, detecting a stabilized fuel pressure via the fuel pressure sensor subsequent to lapse of the resting and stabilization time, and determining a failure of the fuel pressure sensor when the detected stabilized fuel pressure exceeds a predetermined upper limit threshold value or is less than a predetermined lower limit threshold value.