Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1995-12-04
1998-03-17
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01H 4736
Patent
active
057294224
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
Devices and methods for triggering an electromagnetic consumer, in particular a solenoid valve for controlling the fuel quantity to be injected, by means of a half-bridge are known. In these devices, the energy released during the switch-off operation is converted by means of Zener diodes into heat and is lost.
A device for triggering an electromagnetic consumer is described in German Patent Application No. 37 02 680. It describes a circuit arrangement for triggering an electromagnetic consumer. An electronic switching element connected in series to the consumer is able to be bridged by a quenching circuit. This quenching circuit contains an energy store in the form of a capacitor for taking up energy stored in the consumer. The disadvantages associated with this circuit arrangement are that it is complicated and expensive with respect to component parts and, to temporarily store energy, requires a voluminous capacitor which is continually charged at least to supply voltage. In addition to the capacitor, at least two series diodes are needed.
In this device, for every switching operation, the energy stored in the consumer is stored in a capacitor. This temporarily stored energy is conducted into a second consumer during the next triggering operation.
In addition, a device for triggering a consumer is described in German Patent Application No. 37 34 415. It discusses storing the energy released during the switch-off operation in a capacitor. During the switch-on operation, the stored energy is supplied to the consumer. To this end, at least two more switching means are required than is the case in a device without energy feedback.
SUMMARY OF THE INVENTION
The underlying object of the present invention, given a device for triggering an electromagnetic consumer, is to make available a device having a simplest possible construction, which will enable the switch-on operation to be accelerated and the total energy consumption to be minimized.
The circuit arrangement according to the present invention has the advantage of achieving a loss-less quenching operation. In addition, when the energy stored during the quenching operation is used again during the switch-on operation, the rise in current can be intensified. This leads, in turn, to a reduction in the solenoid valve switching time. These advantages are achieved with a minimal expenditure for component parts.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first circuit arrangement of the device according to the present invention.
FIG. 2 shows various signals plotted over time.
FIG. 3a shows a second circuit arrangement of the device according to the present invention.
FIG. 3b shows a third circuit arrangement of the device according to the present invention.
FIG. 4 shows a fourth circuit arrangement of the device according to the present invention.
DETAILED DESCRIPTION
The device according to the present invention is preferably used in internal combustion engines, especially in self-ignition internal combustion engines. In engines of this type, the fuel metering is controlled by electromagnetic valves. These electromagnetic valve are referred to in the following as consumers. However, the present invention is not limited to this application; it can be applied wherever high-speed switching electromagnetic valves are needed.
In such applications, the opening and closing instants of a solenoid valve establish the beginning and end of injection, respectively.
Usually, the time period between the triggering of the solenoid valve and the actual opening or closing of the solenoid valve is described as the switching time. In diesel gasoline engines, in particular, it is desirable for the switching time to be as short as possible.
To attain the shortest possible switching times, it is necessary to have a fast possible build-up or reduction of force in the consumer. Such a fast build-up or reduction of force can be achieved by a correspondingly fast build-up or reduction of current.
The most important elements of the device according
REFERENCES:
patent: Re30150 (1979-11-01), Puvogel
patent: 3467894 (1969-09-01), Blume
patent: 3896346 (1975-07-01), Ule
patent: 4631736 (1986-12-01), Yamanoue et al.
patent: 5036422 (1991-07-01), Uchida et al.
patent: 5040514 (1991-08-01), Kubach
Fleming Fritz
Robert & Bosch GmbH
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