Valves and valve actuation – Electrically actuated valve – Solenoid having plural coils
Patent
1998-09-22
2000-09-19
Jacyna, J. Casimer
Valves and valve actuation
Electrically actuated valve
Solenoid having plural coils
25112909, H01H 4700
Patent
active
061200050
ABSTRACT:
A fuel injector apparatus includes an electromagnetic fuel injector having a housing and a magnetic circuit in the housing. The magnetic circuit includes a first coil having a certain resistance to generate a peak current and a second coil having a resistance greater than the certain resistance to generate a hold current. Circuit structure is disposed in the housing and is electrically coupled with the coils to selectively excite the coils. The circuit structure includes switch structure to transition the peak current to the hold current based on a preset threshold. In a preferred embodiment of the invention, the switch structure includes an RC circuit and a comparator which sets a threshold voltage. A time constant of the RC circuit is provided to be an analog model of an inductance and resistance time constant of the fuel injector such that when a voltage of a capacitor of the RC circuit exceeds the threshold voltage, the peak current is transitioned to the hold current.
REFERENCES:
patent: 4338651 (1982-07-01), Henrich
patent: 4355619 (1982-10-01), Wilkinson
patent: 5363270 (1994-11-01), Wahba
patent: 5490534 (1996-02-01), Van Rens
patent: 5592356 (1997-01-01), Ryl et al.
patent: 5934258 (1999-08-01), Watanabe
Jacyna J. Casimer
Siemens Automotive Corporation
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