Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1998-08-07
2000-05-16
Rivell, John
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
25112916, 25112919, 2395338, F16K 3140, F16K 4700
Patent
active
060625317
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a solenoid valve for controlling an electrically controlled fuel injection valve. A solenoid valve of this kind has been disclosed in EP 0 690 223 A2. It is used there to control an electrically controlled fuel injection valve. The valve needle of the fuel injection valve is loaded in the closing direction by a pressure prevailing in a control chamber. The solenoid valve operates in a known manner so that in order to initiate the injection, it initiates a discharge of the control chamber when the magnet of the solenoid valve is excited and the valve needle of the injection valve is consequently lifted up from its seat through the influence of the high pressure acting on it on the other side. In the solenoid valve, the armature is connected to an armature bolt which the valve member of the solenoid valve in turn rests against.
The disadvantage of the known solenoid valve is comprised in that an oscillation of the armature and/or rebounding of the valve member can occur during its operation, which is particularly disadvantageous if a rapid switching sequence of the solenoid valve is required and the intent is to carry out an injection that is controlled by the solenoid valve and is divided into a preinjection and a main injection.
Furthermore, the proposal has already been made to reduce the moving mass of the unit comprising the armature and valve member in such a way that a part of the armature is embodied so that it can move in relation to another part of the armature. However, this results in a disadvantage by virtue of the fact that the part of the armature that can move in relation to the other part postoscillates after the valve member comes to rest against its seat. Through an oscillation of this kind, the armature assumes an indefinite position after a preinjection, which can result in the fact that during the subsequent main injection, different opening times of the solenoid valve can occur with the same triggering, which leads to a variance in injection quantities.
ADVANTAGES OF THE INVENTION
The solenoid valve has the advantage that a rebound of the valve member against its seat and a postoscillation of the first armature part are prevented so that after the solenoid valve closes, this valve member assumes its closed position and after a desired first deflection movement, the armature part assumes its rest position again rapidly before the main injection begins. It is also advantageous that a damping of a deflection movement of the armature part produced in this manner can be achieved without additional parts in that a damping pocket is produced in the region of the armature part.
BRIEF DESCRIPTION OF THE DRAWINGS
Two exemplary embodiments of the invention are represented in the drawings and are explained in detail in the description below.
FIG. 1 shows a section through a part of an injection valve with the solenoid valve according to the invention in a sectional view, with an armature plate that is movably coupled to an armature bolt,
FIG. 2 shows a first type of damping pocket, and
FIG. 3 shows a second type of damping pocket.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 shows a partial section through an electrically controlled injection valve 1 as has been disclosed, for example, by means of the prior art mentioned at the beginning. An injection valve of this kind is designated for use in a fuel injection system, which is equipped with a high pressure fuel chamber that is continually supplied with high pressure fuel by means of a high pressure delivery pump and from which this fuel can be supplied at injection pressure to the internal combustion engine via individual electrically controlled injection valves. The injection valve 1, which is shown partially and in a sectional view, has an injection valve housing 4 with a longitudinal bore 5 which contains a valve piston 6 which on its one end acts on a valve needle, not shown in detail, which in turn cooperates with injection openings of the fuel injection valve in a known manner, e.g. the manne
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Kellner Andreas
Rapp Holger
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
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