Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
1996-07-08
2001-02-13
Fleming, Fritz (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
Reexamination Certificate
active
06188561
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention pertains to a circuit for driving an excitation coil of an electromagnetically driven reciprocating pump. Such pumps are described in DD-PS 120 51 4, DD-PS 213 472 or in DE-OS 23 07 435. These pumps serve as fuel injection devices. Thereby the exact metering of the fuel to be injected is of main importance. It is known how to effect the metering of the fuel to be injected by e.g. timing. However, a purely time-based control has been found disadvantageous, because the time window available between the minimum and maximum quantity of fuel to be injected is too small to control the quantity spectrum required for engine operation in a sufficiently differentiated and reproducible manner.
SUMMARY OF THE INVENTION
The object of the invention is to create a circuit for driving the excitation coil of an electromagnetically driven reciprocating pump used for a fuel injection device, so that it becomes possible to meter differentiable fuel quantities with the reciprocating pump and that it operates largely independent of coil heating and fluctuations of the supply voltage.
This object s achieved by the characteristic features as per claim
1
. Advantageous further developments of the invention.
The invention is explained in more detail below with the aid of drawings.
REFERENCES:
patent: 4377144 (1983-03-01), Takahashi
patent: 4452210 (1984-06-01), Sasayama et al.
patent: 4944281 (1990-07-01), Suquet
Ficht GmbH & Co. KG
Fleming Fritz
Stockton LLP Kilpatrick
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