Internal combustion engine with on-board diagnostic system for d

Details Internal combustion engine with on-board diagnostic system for d Internal combustion engine with on-board diagnostic system for d

1993-04-19

1995-08-29

Goldstein, Herbert

Measuring and testing

Internal combustion engine or related engine system or...

Compression

123387, F02M 6500

Patent

active

054450195

ABSTRACT:
The present invention is directed to an on-board diagnostic system for detecting impaired fuel injectors in an internal combustion engine during engine operation. A fuel injector control means is provided for individually actuating fuel injectors Operatively connected to a fuel rail. Pressure sensor means are mounted to the fuel rail for sensing transient fuel pressure waves resulting from actuation of the individual fuel injectors. Signal processing means are provided for processing pressure signals from the pressure sensor means. The output signal from the signal processing means corresponds to the fuel flow rate through the fuel injectors. Such output signal can be used to alert an engine operator to an impaired fuel injector and/or can be provided to the fuel injector control means for adjusting the duration of injector actuation to achieve a desired fuel flow quantity per individual actuation.

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