Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1998-02-23
2000-02-29
Gaffin, Jeffrey
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361154, H01H 4728
Patent
active
060317078
ABSTRACT:
The present invention relates to a method and apparatus for control of current rise time during multiple fuel injection events. The invention utilizes a single boost voltage supply circuit, in which the boost capacitor is designed to store slightly more than twice the total energy required to pull-in a single fuel injector solenoid during the prescribed time. A reference waveform simulating the desired current rise time is compared to the actual boost voltage produced by the circuit. The boost voltage is modulated (switched on and off) in order to maintain the boost voltage within a predetermined window around the reference waveform. This modulation will compensate for any droop in boost voltage at the time of actuation, and will also compensate for two solenoids being actuated at the exact same time. It is only necessary that a nninimum amount of energy be stored in the boost capacitor at the completion of an actuation event, and the level of this minimum amount of energy can easily be determined by analysis or experimentation. Additionally, it is very easy to modify the shape and duration of the reference waveform, thus allowing for a very flexible solenoid drive circuit whose pull-in time and boost energy consumption can be easily changed to meet the requirements of an application without modifying the LRC time constants of the system.
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Cummins Engine Company, Inc.
Gaffin Jeffrey
Huynh Kim
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