Fuel injection system designed to ensure enhanced...

Details Fuel injection system designed to ensure enhanced... Fuel injection system designed to ensure enhanced...

2007-10-09

2007-10-09

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

C123S447000, C123S688000, C073S114220, C073S118040

Reexamination Certificate

active

11543214

ABSTRACT:
A fuel injection system for automotive diesel engine is provided which is equipped with a fuel pressure sensor working to measure the pressure of fuel in an accumulator and a pressure-reducing valve working to drain the fuel from the accumulator. The system is designed to ensure enhanced reliability of diagnosis of the pressure-reducing valve. The system works to make a temporal diagnosis of the pressure-reducing valve based on the behavior of the pressure in the accumulator upon opening of the pressure-reducing valve after an ignition switch is turned off. After elapse of a given period of time, when it is determined that a value of the pressure in the accumulator, as measured by the fuel pressure sensor, lies near the atmospheric pressure, the system determines that the fuel pressure sensor is operating properly and fixes the temporal diagnosis of the pressure-reducing valve ultimately.

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patent: 2004-11448 (2004-01-01), None

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