| US 7,581,520 B2 | ||
| Pencil-type glow plug having an integrated combustion chamber pressure sensor | ||
| Christoph Kern, Aspach (Germany); Steffen Schott, Schwieberdingen (Germany); Markus Ledermann, Asperg (Germany); and Pavlo Saltikov, Waiblingen (Germany) | ||
| Assigned to Robert Bosch GmbH, Stuttgart (Germany) | ||
| Appl. No. 11/794,462 PCT Filed Nov. 28, 2005, PCT No. PCT/EP2005/056254 § 371(c)(1), (2), (4) Date Apr. 03, 2008, PCT Pub. No. WO2006/072510, PCT Pub. Date Jul. 13, 2006. |
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| Claims priority of application No. 10 2004 063 750 (DE), filed on Dec. 29, 2004. | ||
| Prior Publication US 2008/0302323 A1, Dec. 11, 2008 | ||
| Int. Cl. G01L 23/10 (2006.01) | ||
| U.S. Cl. 123—145A [73/31.04; 73/31.05; 73/114.18; 73/35.13] | 11 Claims |
| 1. A pencil-type glow plug for a self-igniting internal combustion engine, comprising:
a plug body in which a combustion chamber pressure sensor is integrated;
a bar-shaped heating element that protrudes out at one end from the plug body and protrudes into a combustion chamber of the
internal combustion engine; and
a force-measuring element of the combustion chamber pressure sensor accommodated behind the heating element, which is capable
of axial movement when acted on by pressure, the force-measuring element being sealed against combustion chamber gases by
a steel diaphragm made of stainless precipitation-hardened maraging steel.
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