Internal-combustion engines – Cooling – With cooling of additional parts or materials
Patent
1998-01-14
2000-10-17
Miller, Carl S.
Internal-combustion engines
Cooling
With cooling of additional parts or materials
123467, F01D 106
Patent
active
061315400
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection valve for high pressure injections. U.S. Pat. No. 4,972,997 has disclosed a fuel injection valve of this kind, which is supplied with fuel from a high pressure reservoir. The control of the injection is carried out in an electrohydraulic manner by virtue of the fact that the high pressure fuel source supplies pressurized fuel to a control chamber. This control pressure is used to keep the valve member of the fuel injection valve in the closed position since the control surface acted on by the control pressure is greater than the surface impinged upon on the fuel injection valve. The control chamber continuously communicates with the high pressure fuel source via a first throttle and can be relieved via a second throttle that is controlled by a solenoid valve. As soon as the solenoid valve opens the second throttle, the control chamber is discharged and the pressure on the pressure surfaces of the valve member of the injection valve is sufficient to bring the valve member into the open position so that the injection can take place. If the second throttle is closed again by the solenoid valve, due to the pressure increase in the control chamber, the valve member is brought back into the closed position. The solenoid valve is attached to the housing of the fuel injection valve, coaxial to the axis of the valve member of the injection valve, and has a plug connection for the power supply of the electromagnet of the solenoid valve and furthermore, a discharge line is provided that leads from the electromagnet, via which the fuel diversion quantity at the second throttle can flow to a discharge chamber.
Fuel injection valves of this kind are switched by means of an electrical control device so that high pressure fuel is supplied to the internal combustion engine at the necessary time and in the quantity required. The electrical control circuit is disposed centrally in the vicinity of the fuel injection valves of which one is respectively provided for each cylinder of the associated engine. This disposition, though, has the disadvantage that long line connections that are acted on by high voltages and generate noise fields must be routed to the individual fuel injection valves. Furthermore, due to the available capacity for rapidly opening and closing of the solenoid valves, the heat that remains in the electrical control circuit has to be dissipated in a sufficient manner. This is connected with an additional expense.
ADVANTAGES OF THE INVENTION
The fuel injection valve according to the invention has the advantage over the prior art that the electrical control circuit is subdivided into a first circuit part and second circuit parts which are each provided directly on the fuel injection valve and which include control of the power supply to the electromagnet. It is particularly advantageous to provide the elements of the circuit in the second circuit part, which contain the power components and capacitors of the electrical control circuit. The heat produced particularly in the power components, capacitors, end stages, and diodes is distributed to the individual injection valves and can be dissipated there in an optimal fashion without further expenditure for a control of cooling devices. In particular, this prevents long lines that are highly affected by current from having to be provided. The power losses due to voltage drop are reduced and also, high-stress plug connections are avoided since the high currents only occur in the second circuit part and are guided immediately to the magnet in the shortest line connection. The short lines, moreover, have the additional advantage that noise radiation is reduced, which in particular can have an effect on the electrical circuit of the control device. The first part of the control circuit is reduced to the signal processing part of the circuit, which no longer experiences interference from feedback by means of the power part, which is respectively required for triggering the solenoid valve.
BRIEF DESCRIPTION OF
REFERENCES:
patent: 4345565 (1982-08-01), Bottoms
patent: 4984549 (1991-01-01), Mesenich
patent: 5076241 (1991-12-01), Takahashi
patent: 5156132 (1992-10-01), Iwanaga
patent: 5329908 (1994-07-01), Tarr
patent: 5694903 (1997-12-01), Ganser
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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