Fuel supply system for internal combustion engine

Details Fuel supply system for internal combustion engine Fuel supply system for internal combustion engine

1996-06-03

1998-03-03

Dombroske, George M.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

731181, 364431052, 340439, F02M 3708, G01M 1500

Patent

active

057237808

ABSTRACT:
In a fuel supply system for an internal combustion engine, a feedback correction amount relative to a reference control value for a fuel pump is derived based on a deviation between an actual fuel pressure detected by a pressure sensor and a target fuel pressure. Since the feedback correction amount is controlled to be around zero during normal operation of the system, it is checked whether the feedback correction amount is within a given range. If negative, an occurrence of abnormality in the system is determined when a residual fuel amount in a fuel tank is no less than a criterion value and further when a vehicle is not running on a rough road. When the occurrence of abnormality is determined, a failure flag is set to ON while a failure determination enabling flag is reset to OFF so as to prohibit execution of a given other failure determination process such as a misfire detection process.

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