Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1996-12-06
1998-11-10
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361154, H01F 718
Patent
active
058353305
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for driving an electromagnetic consumer (device).
BACKGROUND INFORMATION
A method and a device for driving an electromagnetic consumer (device) are disclosed by the German Laid Open Print 34 26 799 (U.S. Pat. No. 4,653,447). It describes a device used for detecting the switching instants and, proceeding from this, the break times of the solenoid valve. The exact switching instant of the solenoid valve is determined on the basis of the time characteristic of the current flowing through the solenoid valve.
Furthermore, a device is disclosed by the German Laid Open Print 42 37 706 for detecting the switching instant of a solenoid valve. In this device, a clocked driving of the valve takes place. The current flowing through the valve is controlled to a set point value. The instant when the pulse duty factor changes is recognized as the switching instant.
Solenoid valves of this type are preferably used for controlling fuel injection in gasoline and/or diesel engines. For the precise metering of even the smallest injection quantities, that switching instant is of particular interest at which the armature of the current-carrying solenoid valve reaches one of its two end positions.
The procedure in known systems is to evaluate the current characteristic within a timing window, in which the switching instant usually occurs, and to determine the switching instant on the basis of its time characteristic. The voltage being applied to the solenoid valve is thereby adjusted to a specific value. Thus, a constant solenoid valve voltage is made available to produce a constant characteristic of the solenoid valve current. During this phase in which the voltage is regulated, those switching elements of the control device which are involved are operated at voltage levels at which considerable power losses sometimes occur, which can lead over the short term to an unwanted increase in the temperature of the switching element.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electromagnetic consumer (device) with reduced power loss (dissipation).
Because a clocked voltage control with a specified frequency and a specified pulse duty factor takes place within the BIP (beginning of injection period) timing window, the advantage is attained that the voltage control can be eliminated during BIP recognition, thus considerably reducing the outlay for components and providing for a simpler circuit.
During the BIP recognition phase, which can also be described as the BIP window, the operation of the switching element at levels at which power losses occur is considerably reduced. The characteristic current profile that is adjusting itself makes it possible, given different types of solenoid valves and after first determining the necessary pulse duty factor in each case, for the current characteristic to be reliably evaluated and, thus, for the switching instant to be precisely detected.
With respect to the hydraulic forces and their negative effects on the position of the armature, the possibility exists, by specifying the pulse duty factor, for the current level (force level) to be retained. This offers the advantage that the closing characteristics can be optimally conceived in the sense of available possibilities for intervention. It is not a costly task for a microcomputer or for separate hardware switching pattern, so that the circuit and its function can be simplified as far as realization outlay is concerned. Furthermore, the task of filtering the signal is eliminated.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of the device according to the present invention. FIG. 2 shows signals according to the present invention plotted over time. FIG. 3 shows a flow chart of an embodiment of the method according to the present invention. FIG. 4 shows a detail of one section of the signal graph of FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides for driving an electromagnetic con
REFERENCES:
patent: 4653447 (1987-03-01), Linder et al.
patent: 5053911 (1991-10-01), Kopec et al.
patent: 5539608 (1996-07-01), Hurley et al.
Henke Torsten
Kirschner Michael
Fleming Fritz
Robert & Bosch GmbH
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