Pressure-measuring glow plug

Patent metadata

Field	Value
Publication number	US-9709272-B2
Application number	US-201214364256-A
Country	US
Kind code	B2
Filing date	Dec 10, 2012
Priority date	Dec 14, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A pressure-measuring glow plug has a heating pin for igniting a combustion mixture of an internal combustion engine and a pressure sensor for detecting a combustion chamber pressure of the internal combustion engine. The pressure-measuring glow plug has a contacting unit which includes a carrier for accommodating a signal processing unit and a plug connection having connecting contacts in a plug housing. A glow module housing for accommodating the heating pin and the pressure sensor and an electronic module housing for accommodating the carrier are provided. The electronic module housing is connected at a glow module-sided connecting location to the glow module housing and, at a plug-sided connecting location, to the plug housing.

First claim

What is claimed is:

1. A pressure-measuring glow plug, comprising:
a glow module, including:
a heating pin configured to ignite a combustion mixture of an internal combustion engine;
a pressure sensor configured to detect a combustion chamber pressure of the internal combustion engine; and
at least one glow module housing accommodating the heating pin and the pressure sensor; and

an electronic module, including:
a contacting unit including a carrier for accommodating a signal processing unit, the carrier enclosing a plurality of electrically conductive connecting lines and including a glow module-sided end face facing the glow module, and a plurality of glow module-sided contacts forming an extension of the plurality of electrically conductive connecting lines extending from the end face toward the glow module;
an electronic module housing accommodating the carrier, the electronic module housing being separate from the glow module housing and having a surface that mates to a surface of the glow module housing, the plurality of glow module-sided contacts extending from the end face of the carrier beyond the electronic module housing;
a plug connection having connecting contacts; and
a plug housing for the plug connection;

wherein the heating pin is exposed to the combustion chamber pressure and transmits the combustion chamber pressure at least indirectly to the pressure sensor.

2. The pressure-measuring glow plug as recited in claim 1 , wherein the electronic module housing is connected (i) to the glow module housing via at least one glow module-sided connecting location, and (ii) to the plug housing via at least one plug-sided connecting location.

3. The pressure-measuring glow plug as recited in claim 1 , wherein the plurality of contacts extending from the end face include a high current contact.

4. The pressure-measuring glow plug as recited in claim 1 , wherein the electronic module housing is supported, via at least one carrier-sided support section, on at least one carrier-sided carrier section of the carrier.

5. The pressure-measuring glow plug as recited in claim 1 , wherein the electronic module housing is supported, via at least one plug-sided support section, on at least one plug-sided carrier section of the plug housing.

6. The pressure-measuring glow plug as recited in claim 5 , wherein a sealing ring and a weldable retaining ring are situated on the plug-sided carrier section, and wherein the electronic module housing encloses the sealing ring in a sealing manner using the plug-sided support section and is fastened on the retaining ring.

7. The pressure-measuring glow plug as recited in claim 5 , wherein the carrier-sided supporting section forms at least one first cylindrical section having at least one first inside diameter d 1 , the plug-sided support section forms at least one second cylindrical section having at least one second inside diameter d 2 , and the inside diameter d 2 of the plug-sided support section is greater than the inside diameter d 1 of the carrier-sided support section.

8. The pressure-measuring glow plug as recited in claim 7 , wherein the electronic module housing has at least a first housing part and a second housing part, and wherein the first housing part forms the carrier-sided support section having at least the first inside diameter d 1 and the second housing part forms the plug-sided support section having at least the second inside diameter d 2 .

9. The pressure-measuring glow plug as recited in claim 1 , wherein the electrically conductive connecting lines extend from the plurality of contacts at the end face to the plug connection.

10. The pressure-measuring glow plug as recited in claim 1 , wherein the plurality of contacts form ends of the plurality of connecting lines enclosed by the carrier.

11. The pressure-measuring glow plug as recited in claim 1 , wherein the carrier includes at least one cylindrical section having the end face.

12. The pressure-measuring glow plug as recited in claim 1 , wherein the end face is substantially perpendicular to a direction of extension of the plurality of contacts from the end face.

13. The pressure-measuring glow plug as recited in claim 1 , wherein the end face is substantially perpendicular to a longitudinal axis of the electronic module.

14. The pressure-measuring glow plug as recited in claim 1 , wherein the carrier is formed from an electrically insulating material.

15. The pressure-measuring glow plug as recited in claim 1 , wherein the carrier and plug housing are a single integral component.

16. A pressure-measuring glow plug, comprising:
a glow module including a glow module housing at least partially enclosing a heating pin and a pressure sensor; and
an electronic module including:
an electronic module housing at least partially enclosing a contacting unit, the electronic module housing being separate from the glow module housing and having a surface that mates to a surface of the glow module housing,
the contacting unit including a carrier for accommodating a signal processing unit, the carrier enclosing a plurality of electrically conductive connecting lines and having an end face facing the glow module, and
a plurality of contacts forming an extension of the plurality of electrically conductive connecting lines extending from the end face toward the glow module housing and beyond the electronic module housing.

17. The pressure-measuring glow plug as recited in claim 16 , wherein the electronic module includes a plug housing at least partially enclosing a plug connection.

18. The pressure-measuring glow plug as recited in claim 16 , wherein the plurality of contacts extending from the end face include a high current contact.

19. The pressure-measuring glow plug as recited in claim 16 , further comprising a sealing ring and a weldable retaining ring situated on a plug-sided section of the carrier.

20. The pressure-measuring glow plug as recited in claim 16 , wherein the electrically conductive connecting lines extend from the plurality of contacts at the end face to a plug connection.

21. The pressure-measuring glow plug as recited in claim 16 , wherein the end face is substantially perpendicular to a direction of extension of the plurality of contacts from the end face.

Assignees

• Bosch Gmbh Robert

Inventors

• Scholzen Holger
• Wolff Janpeter
• Koetzle Wolfgang

Classifications

• G01M15/042

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title

• F23Q2007/002

  with sensing means · CPC title

• F23Q7/001 Primary

  Glowing plugs for internal-combustion engines · CPC title