Sheathed Element Glow Plug Having an Integrated Pressure Measuring Element

a technology of pressure measuring element and glow plug, which is applied in the direction of lighting and heating apparatus, instruments, machines/engines, etc., can solve the problems of increasing assembly effort, affecting the accuracy of the output, so as to reduce production costs, avoid delivery bottlenecks, and improve the effect of accuracy

US20100032423A1Inactive Publication Date: 2010-02-11ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2010-02-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

In combustion chamber signal-based engine control in particular, a reliable and at the same time cost-effective option for detecting a combustion chamber pressure in compression-ignition internal combustion engines is required. A sheathed element glow plug is proposed, which has a glow plug module and a pressure measuring module connected to the glow plug module. The glow plug module has a heating element and a glow plug housing. The pressure measuring module has at least one force measuring element, which is integrated into the pressure measuring module. The at least one force measuring element is designed to generate an electrical signal as a function of a force. In the mounted state of the sheathed element glow plug, the at least one force measuring element is connected to the heating element in such a way that a force is transmittable to the at least one force measuring element via the heating element.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to a sheathed element glow plug having an integrated pressure measuring element and a method for manufacturing a sheathed element glow plug of this type. In particular, the present invention relates to a sheathed element glow plug which, in addition to a heating element and a glow plug housing, has a pressure measuring module having at least one force measuring element.BACKGROUND INFORMATION

[0002] As a result of increasingly strict legal exhaust gas regulations, in particular for diesel engines, the requirements for reduced emissions of harmful substances by compression-ignition internal combustion engines are becoming stricter. Modern engine management systems should ensure low fuel consumption, while having a long service life.

[0003] Combustion in the combustion chamber of a diesel engine may be optimized in particular by using regulated injection of fuel. This regulated injection may be controlled in particular by electronic...

Examples

Embodiment Construction

[0026]FIG. 1 shows a specific embodiment of a sheathed element glow plug 110 according to the present invention. Sheathed element glow plug 110 has a first module 112 (glow plug module) and a pressure measuring module 114. Both modules are separated along an interface by a separating wall 116, which may be a component of pressure measuring module 114 or also of glow plug module 112. Two separating walls 116 are also possible, one separating wall being a component of glow plug module 112 and one separating wall being a component of pressure measuring module 114. Pressure measuring module 114 and glow plug module112 may be connected by welding, for example. A threaded connection using an appropriate union nut is also conceivable.

[0027]Glow plug module 112 has a housing 118 having an essentially cylindrical interior space 120. At one end of housing 118 facing away from pressure measuring module 114 and facing a combustion chamber of the internal combustion engine, housing 118 has a sea...