Solenoid control using voltage control of freewheel current...

Details Solenoid control using voltage control of freewheel current... Solenoid control using voltage control of freewheel current...

2006-04-04

2006-04-04

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

07023682

ABSTRACT:
In a vehicle fuel-injection system, additional voltage is applied to an otherwise current-controlled valve solenoid so as to increase the time window over which freewheeling current in the solenoid decreases from a pull-in level to a hold level. The time during which the Beginning of Injection Pulse (BIP) signal is detected is thereby increased.

REFERENCES:
patent: 4949215 (1990-08-01), Studtmann et al.
patent: 5574617 (1996-11-01), Shimanuki et al.
patent: 5975057 (1999-11-01), Repplinger et al.
patent: 6262874 (2001-07-01), Stoll et al.
patent: 6390082 (2002-05-01), Duffy et al.
patent: 6772737 (2004-08-01), Gaessler et al.

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