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Fuel injector and its control valve

A technology for controlling valves and injectors, which is applied in the direction of fuel injection devices, valve devices, valve details, etc., and can solve the problems of unstable closing behavior of armature column 1 and deviation of fuel injection quantity, etc.

Active Publication Date: 2021-09-14
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the closing behavior of armature column 1 is unstable due to hydraulic sticking, which leads to large deviations in the injected fuel quantity between injections

Method used

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  • Fuel injector and its control valve
  • Fuel injector and its control valve
  • Fuel injector and its control valve

Examples

Experimental program
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Embodiment Construction

[0028] Some possible implementations of the present application will be described below with reference to the accompanying drawings. Please note that the drawings provided here are only illustrative and do not limit the scope of the application in any way. For the sake of clarity, the figures are not drawn to scale, with some structures intentionally exaggerated to clearly represent them.

[0029] image 3 A fuel injector for injecting fuel into an engine according to a possible embodiment of the application is shown in partial view, in particular a fuel injector of the common rail type used in a diesel injection system. The fuel injector consists of a control valve and an injection valve, for example assembled in a common rail type fuel injector housing 100 (only in image 3 Schematically illustrated in). The improvement made in this application is mainly related to the control valve, so image 3 Mainly shows the corresponding part of the control valve. The injection val...

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PUM

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Abstract

A control valve for a fuel injector comprising: a spool (3) and a valve seat (4) cooperating with each other; an armature guide (2) including an inner bore (2a) passing therethrough, which is defined by an inner peripheral and the armature post (1), which passes through the inner hole (2a), the armature post (1) can move forward relative to the armature guide (2) to exert force on the spool (3) thrust, thereby closing the control valve, and can move backward relative to the armature guide (2) to release the thrust applied to the spool (3), thereby opening the control valve. Wherein, the inner peripheral surface of the armature guide (2) includes a post guide section (22a) that guides the armature post (1) to move back and forth and a post guide section (22a) with a diameter larger than that of the non-guidance section (22b).

Description

technical field [0001] The present application relates to control valves used in fuel injectors and fuel injectors comprising such control valves, in particular common rail type fuel injectors. Background technique [0002] A fuel injector generally includes a control valve and an injection valve, and the fuel injection action of the injection valve is controlled by switching the control valve between opening and closing. figure 1 A partial structure of such a control valve is schematically shown, including a control valve with an armature post 1 passing through an inner hole 2a of an armature guide 2 (see figure 2 ) is inserted and can slide relative to the armature guide 2. The control valve also includes a solenoid (not shown), which can be energized and de-energized. When the electromagnetic coil is de-energized, under the thrust of a spring (not shown), the armature column 1 pushes the ball-shaped valve core 3 onto the valve seat 4 to close the valve hole 5 formed in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M51/06F16K31/02
CPCF02M51/0685F02M63/0071F02M51/06
Inventor Z·塞朗E·塔拉齐H·拉普
Owner ROBERT BOSCH GMBH