Control circuit for an electromagnetic device for controlling an electromagnetic fuel control valve
Patent 5940262 Issued on August 17, 1999. Estimated Expiration Date: 
September 18, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 18, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCircuit for controlling inductive loads, particularly for the operation of the electro-injectors of a diesel-engine Solenoid closure detection Apparatus and method for extending the breakdown capability of a switching circuit Control circuit for predominantly inductive loads in particular electroinjectors Device and method for triggering an electromagnetic consumer Patent #: 5729422 InventorAssigneeApplicationNo. 932881 filed on 09/18/1997US Classes:361/155, With capacitor charging or discharging through coil361/154, Including means to establish plural distinct current levels (e.g., high, low)361/189Plural switches in control circuitExaminersPrimary: Gaffin, JeffreyAssistant: Huynh, Kim Attorney, Agent or FirmForeign Patent References
International ClassesH01H 047/04H01H 047/22 Foreign Application Priority Data1996-09-20 GBAbstractA control circuit for an electromagnetically operable fuel control valve of a vehicle engine includes a tank capacitor which upon closure of first and second controllable switches supplies current to the winding of the valve to achieve a high rate of rise of current in the winding and rapid operation of the valve. Following operation of the valve it is maintained in its operated state by current chopping action, the current rise being achieved by drawing current from a low voltage source through a third controllable switch. The current fall is at a high rate and the resultant high voltage induced in the winding is utilized to recharge the tank capacitor.Other References
Field of SearchIncluding particular drive circuitPulse initiated Including means to establish plural distinct current levels (e.g., high, low) With capacitor charging or discharging through coil With capacitor charging or discharging through coil Including means for using, or compensating for, the induced EMF of the electromagnetic device Plural switches in control circuit Including electronic switch Actuator circuit (e.g., engine condition responsive electronic circuit actuates injector valve) Injector solenoid drive | |
