Method and unit for diagnosing leakage of an internal combustion

Details Method and unit for diagnosing leakage of an internal combustion Method and unit for diagnosing leakage of an internal combustion

1997-01-21

1998-06-30

Dombroske, George M.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

701103, G01M 1500

Patent

active

057737169

ABSTRACT:
The diagnostic method includes the steps of: generating a pressure signal related to the fuel pressure of an injection system of an engine; comparing the pressure signal with a reference pressure value; determining a fuel leakage condition of the injection system when the pressure signal is less than the reference pressure value; reducing the quantity of fuel injected into the cylinders of the engine in the presence of the leakage condition; calculating a share value contributed by each cylinder to the work torque value generated by the engine; comparing each share value with a respective reference share value; determining a jammed-open injector condition when at least one of the share values is greater than the respective reference share value; and determining a supply circuit failure condition when the share values are all less than the respective reference share values.

REFERENCES:
patent: 4559815 (1985-12-01), Needham
patent: 4561297 (1985-12-01), Holland
patent: 5020362 (1991-06-01), Hart et al.
patent: 5445019 (1995-08-01), Glidewell et al.
patent: 5535621 (1996-07-01), Glidewell et al.

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