Method and device for operating a fuel injector with a hydraulic stop
A fuel injector, hydraulic technology, applied in the direction of fuel injection device, fuel injection control, charging system, etc., can solve the problem of inability to maintain the gap width, blockage, etc.
Active Publication Date: 2022-02-01
VTESCO TECH GMBH
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
However, if the hydraulic pressure is too low, for example in the event of a failure of the fuel pump (high pressure pump), then the required gap width cannot be maintained and the fuel is injected after a very short time based on a small (or in the worst case closed) gaps that are blocked by a correspondingly high pressure drop
Method used
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[0038] It is pointed out that the embodiments described subsequently represent only a limited selection of possible implementation variants of the invention.
[0039] figure 1 A fuel injector 1 with a hydraulic stop is shown in the closed state. The fuel injector 1 has a housing 2 , a coil 3 , a movable armature 4 , a nozzle needle 5 mechanically coupled or (for example via a driver) coupleable to the armature, a pole shoe 6 and a calibration spring 7 . exist figure 1 In the state shown in , the valve needle rests in the valve seat 8 and thus blocks the orifice 9 . In this state, the gap 10 between the armature 4 and the pole piece therefore has a maximum width.
[0040] When a voltage is applied to the coil 3, the armature 4 is moved towards the pole piece 6 by electromagnetic force. Through the mechanical coupling, the nozzle needle 5 is likewise moved and releases the injection opening 9 for fuel supply. In the case of fuel injectors with idle travel, the mechanical c...
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A method is described for operating a fuel injector with a hydraulic stop, the fuel injector having a magnetic coil drive and a pole piece, wherein the magnetic coil drive has a movable armature and a nozzle movable via the armature Needle. The described method has the steps of: (a) loading (510) a magnetic coil driver of the fuel injector with a first current profile to perform a first injection event and thereby inject a predetermined injection amount, (b) ascertaining (520) a first value of a system parameter representing a correlation between the actual amount of injected fuel and a predetermined amount of fuel, (c) based on said system Determine ( 530 ) whether the actual injected fuel quantity is so much less than the predetermined fuel quantity, which can be caused by the magnetic force applied to the armature in the direction of the pole piece and the opposite caused by an imbalance between hydraulic forces exerted by the fuel on the armature, and (d) loading ( 535 ) the fuel injection with a second current profile when it is determined that an imbalance between magnetic and hydraulic forces exists In order to carry out a second injection process, the second current profile is arranged in such a way that, compared to the first current profile, a lower magnetic force is applied to the armature in the direction of the pole shoe. A motor control device and a computer program are also described.
Description
technical field [0001] The invention relates to the technical field of operating fuel injectors with hydraulic stops. More particularly, the invention relates to a method for operating a fuel injector with a hydraulic stop, wherein the fuel injector has a magnetic coil drive and a pole piece, wherein the magnetic coil drive has a movable electric An armature and a nozzle needle that can be moved by the armature. The invention also relates to a motor control device for using the method and a computer program for carrying out the method. Background technique [0002] In fuel injectors with a so-called hydraulic stop, there is no direct contact between the armature and the pole piece when the fuel injector is opened, since the fuel flows between the armature and the pole piece and is opposed to the magnetic force here. Hydraulic pressure is applied to the armature. In the open state of the fuel injector, the two forces balance each other such that there is a gap of substanti...
Claims
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IPC IPC(8): F02D41/20F02M45/02F02M45/12F02D41/24F02D41/38
CPCF02M45/02F02M45/12F02D2200/0602F02D41/247F02D2041/2048F02D2200/063F02D41/221F02D2041/2003F02D2200/0616F02D41/20F02D2041/2055
Inventor M.施蒂卡G.罗塞尔
Owner VTESCO TECH GMBH