Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-07-27
2001-06-26
Kwon, John (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C361S154000
Reexamination Certificate
active
06250286
ABSTRACT:
BACKGROUND INFORMATION
A method and a device for driving at least one solenoid valve are described in German Patent No. 195 39 071. The solenoid valve is installed in an internal combustion engine to control the metering of fuel. To perform an accelerated start-up (energizing), the voltage applied to a booster capacitor is fed to the load. This means that the voltage supplied to the load at the start of the driving (activation) is elevated as compared to that used for the further driving.
Because of the high booster voltage and the energy extracted from the booster capacitor during injection, very high power losses occur in the output stage. This is due particularly to the fact that the voltage is generated using a dissipative DC/DC converter. Smaller booster voltages result in smaller booster currents, shorter booster times, a smaller power loss, but also in longer switching times for the solenoid valve.
SUMMARY OF THE INVENTION
An object of the present invention is to reduce power loss, while at the same time minimizing the effect of prolonged switching times (operating-time delays) to the greatest extent possible.
Due to fact that the energy or the power output is able to be influenced as a function of the operating state at the start of activation, the power loss dissipation can be substantially reduced with the effects of the resultant prolonged switching times being minimal. The energy or the power output is preferably influenced by one or a plurality of the variables booster voltage, booster current or booster time. In particular, the power loss dissipation is reduced by lowering the booster voltage and/or the booster current and/or the booster time in specific operating states.
Short switching times can be achieved for those operating states which require them, by specifying the energizing conditions, i.e., the energy or the power output supplied to the solenoid valve, as a function of the operating parameters. Also, shorter time intervals between two injections can be achieved in certain operating states. Moreover, the power loss dissipation occurring in the control unit can be reduced. This facilitates integration of the output stage and the control unit in one housing. In addition, the DC/DC converter used can be rated for a lower capacity. The result is a substantial reduction in cost outlay. The power output required of the voltage supply is also reduced.
REFERENCES:
patent: 4764840 (1988-08-01), Petrie et al.
patent: 5400757 (1995-03-01), Ishibashi et al.
patent: 5430601 (1995-07-01), Burcham
patent: 5469825 (1995-11-01), Golab et al.
patent: 5477831 (1995-12-01), Akaki et al.
patent: 5632250 (1997-05-01), Kato et al.
patent: 195 39 071 (1996-09-01), None
patent: 0 893 594 (1999-01-01), None
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patent: 6-241137 (1994-08-01), None
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patent: 10-77925 (1998-03-01), None
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patent: 11-351039 (1999-12-01), None
Bochum Hansjoerg
Eckhardt Juergen
Eichendorf Andreas
Gantenbein Reinhard
Herrmann Bernd
Kenyon & Kenyon
Kwon John
Robert & Bosch GmbH
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