Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1997-09-02
1999-08-10
Gaffin, Jeffrey
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361155, H01H 900
Patent
active
059368276
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for controlling at least one electromagnetic load.
BACKGROUND INFORMATION.
Such a device for controlling an electromagnetic load is described in German Patent application No. 44 13 240 (not a prior publication). In this device, the energy released when shutting off the device is stored in a capacitor. The energy released during the transition from a holding current to 0 current is transferred to a capacitor.
The energy released during the transition from starting current to holding current is lost in this device.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device of a relatively simple construction for controlling an electromagnetic load in order to speed up the switching-on process and minimize the overall power consumption.
The device according to the present invention offers the advantage that the energy released during the transition from starting current to holding current can be recovered. A particularly advantageous embodiment also allows two loads to be controlled in different ways with the same output element. This means that injections overlapping in time are possible.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first circuit arrangement of the device according to the present invention.
FIG. 2 shows a second circuit arrangement of the device according to the present invention.
FIG. 3a shows a control signal AC plotted over time.
FIG. 3b shows a control signal AH plotted over time.
FIG. 3c shows a control signal AL plotted over time.
FIG. 3d shows a graph of a current I flowing through a load plotted over time.
FIG. 3e shows a graph of a voltage UC applied to a capacitor plotted over time.
FIG. 4a shows a control signal AC plotted over time for another embodiment according to the present invention.
FIG. 4b shows a control signal AH plotted over time for another embodiment according to the present invention.
FIG. 4c shows a control signal AL plotted over time for another embodiment according to the present invention.
FIG. 4d shows a signal AS plotted over time for the charge status of the capacitor another embodiment according to the present invention.
FIG. 4e shows a graph of a current I flowing through a load plotted over time for another embodiment according to the present invention.
FIG. 4f shows a graph of a voltage UC applied to a capacitor plotted over time for another embodiment according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The device according to the present invention is preferably used in internal combustion engines, in particular in self-igniting internal combustion engines. In these machines, fuel delivery is controlled using electromagnetic valves, hereinafter referred to as "loads." The present invention is not limited to such application, but can be used wherever quick-switching electromagnetic loads are needed.
When used in internal combustion engines, in particular in self-igniting internal combustion engines, the times of opening and closing of the solenoid valves determine the fuel injection start and injection end, respectively, into the cylinder.
FIG. 1 shows the essential elements of the device according to the present invention. The illustrated embodiment is a four-cylinder internal combustion engine, where an injection valve is assigned to each load and a cylinder of the internal combustion engine is assigned to each injection valve. When more engine cylinders are present, more valves, switching means, and diodes are to be provided accordingly.
Four loads are denoted as 100, 101, 102, and 103. Each terminal of loads 100 through 103 is connected to a voltage supply 105 through a first switching means apparatus 115 and a diode 110.
Diode 110 is configured so that its anode is connected to the positive pole and its cathode is connected to first switching means 115. Switching means 115 is preferably a field-effect transistor.
The second terminal of each load 100 through 103 is connected to a resistor means (element) 125 via a second swit
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patent: 5621604 (1997-04-01), Carlson
patent: 5729422 (1998-03-01), Henke
Burkel Rainer
Dressler Klaus
Eyberg Wilhelm
Koch Andreas
Krampe Wolfgang
Gaffin Jeffrey
Huynh Kim
Robert & Bosch GmbH
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