Device for recording the instant at which injection starts in an

Details Device for recording the instant at which injection starts in an Device for recording the instant at which injection starts in an

1993-08-27

1995-07-18

Chilcot, Jr., Richard E.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

G01M 1500, F02M 6500

Patent

active

054331099

ABSTRACT:
An internal combustion engine has an injection valve. A device for recording an instant at which injection starts in the injection valve includes a differentiating device connected to the injection valve for receiving current through the injection valve and emitting an output signal corresponding to a second derivative of a variation in current with respect to time. A threshold value stage is connected to the differentiating device for receiving the output signal and generating a threshold signal whenever the output signal exceeds a threshold value. A logic device is connected to the threshold value stage for recognizing the instant at which injection starts when the threshold signal occurs for a second time after a triggering instant of the injection valve.

REFERENCES:
patent: 3940692 (1976-02-01), Neilson
patent: 4145932 (1979-03-01), Pagel
patent: 4426981 (1984-01-01), Greiner et al.
patent: 4612597 (1986-09-01), Hamren
patent: 4736267 (1988-04-01), Karlmann et al.
patent: 4791809 (1988-12-01), Schmidt
patent: 5038744 (1991-08-01), Martin et al.
patent: 5182517 (1993-01-01), Thelen et al.

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