Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
COMBUSTION PRESSURE SENSOR AND ITS ASSEMBLY IN AN ENGINE COMPONENT OF AN INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2018/084711
Kind Code:
A4
Abstract:
A combustion pressure sensor comprises a sensor body (9), at least one first optical fibre (1, 2) inserted into the sensor body (9), and a resiliently deformable membrane (7; 13) attached to the sensor body (9). The at least one first optical fibre (1, 2) is arranged for allowing measuring of a pressure induced deflection of the resiliently deformable membrane (9). An end (25) of the at least one first optical fibre (1, 2) is connected to the sensor body (9) in a manner that withstands temperatures within a range of temperatures hot enough to regenerate soot depositions on the resiliently deformable membrane (7; 13), yet cool enough to prevent melting of the resiliently deformable membrane (7; 13). When included in an internal combustion engine, at least one such combustion pressure sensor is positioned with its resiliently deformable membrane (7; 13) in direct contact with a surrounding body (8) of an engine component for direct transfer of heat to the surrounding body (8).

Inventors:
NOOIJEN, Paul Johan Willem Maria (Nieuwe Hescheweg 288, 5342 NM Oss, NL)
Application Number:
NL2017/050717
Publication Date:
August 02, 2018
Filing Date:
November 07, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NOOIJEN, Paul Johan Willem Maria (Nieuwe Hescheweg 288, 5342 NM Oss, NL)
International Classes:
G01L9/00; F02M65/00; G01L11/02; G01L23/06; G01M15/08; G02B6/44
Attorney, Agent or Firm:
JANSEN, C. M. (V.O, Carnegieplein 5, 2517 KJ Den Haag, NL)
Download PDF:
Claims:
AMENDED CLAIMS

received by the International Bureau on 09 MAY 2018 (09.05.2018)

Claims 1. Combustion pressure sensor comprising a sensor body, at least one first optical fibre inserted into the sensor body, and a resiliently deformable membrane attached to the sensor body, wherein the at least one first optical fibre is arranged for allowing measuring of a pressure induced deflection of the resiliently deformable membrane, wherein an end of the at least one first optical fibre is connected to the sensor body;

at least one second optical fibre is inserted into the sensor body;

the at least one second optical fibre is arranged for allowing; detection of a temperature induced thermal expansion of the resiliently deformable membrane to enable temperature correction of pressure related values obtained by the at least one first optical fibre;

the first optical fibre is positioned at a first distance from the axis of the sensor; and

the second optical fibre is positioned at a second distance from the axis of the sensor and the first distance IB emaller than the second distance. 2. Combustion pressure sensor as in claim 1, wherein the at least one first optical fibre is positioned centrally with respect to the resiliently deformable membrane, and wherein the at least one second optical fibre is positioned adjacent to an outer edge of the resiliently deformable membrane. 3. Combustion pressure sensor as claim 2, wherein the at least one second optical fibre is one of a second pair of optical fibres, wherein one optical fibre of the second pair emits light, and wherein the other optical fibre of the second pair allows measuring of an intensity of light reflected by a reflective surface on the outer Bdge of the resiliently deformable membrane.

4. Combustion pressure sensor as in one of claims 1 to 3, wherein the at least one first optical fibre is one of a first pair of optical fibres, wherein one optical fibre of the first pair emits light, and wherein the other optical fibre of the first pair allows measuring of an intensity of light reflected by a reflective surface on a central part of the resiliently deformable membrane. 5. Combustion pressure sensor as in one of the claim 1 to 4 wherein the resiliently deformable membrane has a substantially flat central part and a peripheral part surrounding outer edge part having an orientation substantially perpendicular to the central part. 6. Combustion pressure sensor as in one of claims 1 to 5, wherein a first fibre distance between an end of the first optical fibre and the membrane is substantially equal to a second fibre distance between an end of the second optical fibre and the membrane. 7. Combustion pressure sensor ae in one of claims 1 to 6, wherein the end of the at least one first optical fibre is connected to the sensor body by at least one ferrulo. 8. Combustion pressure sensor as in claim 7, wherein the combustion pressure sensor comprises a separation gap, arranged to provide a heat insulating separation between at least a part of the at least one ferrule and at least a part of the sensor body, wherein the separation gap is provided circumferentially around a proximal end of the ferrule. 9. Combustion pressure sensor as in claim 7, wherein the end of the at least one first optical fibre is connected to the sensor body by a pair of ferrules oppositely engaging a portion of the sensor body.

10. Combustion pressure sensor as in one of claim 7 to 9, wherein the at least one ferrule is made of a material having a relatively low expansion coefficient, including one of Kovar, quartz or ceramic. 11. Combustion pressure sensor as in one of claim 1 to 1.0, wherein the at least one first optical fibre is connected to the sensor body by one of brazing, soldering, bonding, cementing, injection moulding, glueing and or pros a fitting. 12. Combustion pressure sensor as in one of claims 1 to 11, wherein the manner of connecting the at least one first optical fibre to the sensor body also resists disconnection under temperature induced expansion and contraction or press fit 13. Combustion pressure sensor as in one of claims 1 to 12, wherein the at least one first optical fibre is arranged for optical beam splitting. 14. Combustion pressure sensor as in any of the previous claims, wherein a separation gap is provided between the first fibre module and the sensor body, wherein the separation gap is provided circumferentially around the first fibre module, wherein the material occupying the separation gap has a higher thermal resistance than the material comprised by the sensor body. 15. Combustion pressure sensor as in any of claims 1 to 14, wherein the temperature range is between 540 °C and 750 °C. 16. Combustion pressure sensor as in any of claims 1 to 13, wherein the sensor body is made of a material having a relatively low expansion coefficient lower than (*10-6m/m K-l). 17. Combustion pressure sensor as in claim 16, wherein the sensor body is made of one of Kovar quartz and a ceramic material.

18. Internal combustion engine, including at least one combustion pressure sensor according to one of claims 1 to 15. 19. Internal combustion engine as in claim 16, wherein the at least one combustion pressure sensor is positioned with its resiliently deformable membrane in direct contact with a surrounding body of an engine component for direct transfer of heat to the surrounding body. 20. Internal combustion engine as in one of claims 18 or 19, wherein the resiliently deformable membrane is separated from a combustion chamber of the internal combustion engine by a channel in the engine component. 21. Internal combustion engine as in claim 20, wherein the channel has a length that is selected to be commensurate with the working temperature range of the resiliently deformable membrane. 22. Operating module, arranged to operate the combustion pressure sensor according to any of the previous claims, comprising:

a first light source, arranged to provide the first fibre module with a first light beam,

a second light source, arranged to provide the second fibre module with a second light beam,

a first light sensor, arranged to receive a reflection of at least part of the first light beam from the first fibre module,

a second light sensor, arranged to receive a reflection of at least part of the second light beam from the second fibre module. 23. Processing module, arranged to:

Receive a signal corresponding to a signal received by the operating module according to claim 22,

24. System comprising:

A combustion pressure sensor according to any of the claims 1-17, The operating module according to claim 22,

The processing module according to claim 23, 25. Method of determining a temperature difference between multiple locations on a membrane of a combustion pressure sensor according to any of the claims 1-17, comprising:

determining a first deformation of the membrane using at least part of a signal corresponding to a light beam received from the first fibre module determining a second deformation of the membrane using at least part of a signal corresponding to a light beam received from the second fibre module

Comparing the first deformation and the second deformation 26. Computer software, comprising computer executable code that enables a computer, with the code loaded in the memory of the computer, to execute the method according to claim 25. 27. Method of controlling operation of an internal combustion engine

comprising a crank shaft and a cylinder, the method comprising;

Providing a combustible mixture in the cylinder, wherein the combustible mixture comprises at least oxygen and a first combustible at a first mixture ratio;

Obtaining an annular position of the Crank shaft;

Triggering combustion of the combustible mixture at a desired first annular position of the crank shaft;

Obtaining a temperature of the combustible mixture in the cylinder during combustion;

Comparing the temperature to a pre-determined temperature rango; If the temperature if outside of the pre-determined range, adjust at least one of;

the first mixture ratio; and desired first annular position of the crank shaft at which the ignition of the combustible mixture is triggered 28. Method according to claim 27, further comprising at least one of:

delaying triggering of the combustion in a subsequent combustion stroke if the obtained temperature is above the pre-determined temperature range; and

bringing forward triggering of the combustion in a subsequent combustion stroke if the obtained temperature is below the predetermined temperature range. 29. Method according to claim 27 or 29, wherein the combustion is triggered by injecting a second combustible in the cylinder. 30. Method according to claim 31 to the extent dependent on claim 28, wherein:

delaying triggering of the combustion comprises at least one of the following:

delaying a moment at which the second combustible is injected; and

reducing an amount of second combustible; and

bringing forward triggering of the combustion comprises at least one of the following:

bringing forward a moment at which the second combustible is injected; and

increasing an amount of second combustible. 31. Method according to claim 30, wherein the second combustible is

injected in two stages and wherein:

delaying a moment at which the second combustible is injected comprises delaying the second injection stage relative to the first stage; and bringing forward a moment at which the second combustible is injected comprises bringing forward the second injection stage relative to the first stage. 32. Method according to any of the claims 27 to 31, wherein obtaining the temperature comprises:

btaining a pressure in the cylinder;

btaining a volume of the mixture in the cylinder;

obtaining a pre-determined constant baaed on the content of the combustible mixture; and

deriving the temperature based on the obtained pressure, the volume and the pre -determined constant. 33. Method according to any of the claims 27 to 31, wherein obtaining the combustion temperature comprises obtaining the temperature difference according to the method of claim 27. 34. Method according to any of the claims 29 to 33, further comprising if the temperature is out of range, adjusting an amount of the second combustible provided to the cylinder. 35. Method according to claim 29, wherein the oxygen, the first

combustible, and the second combustible are provided in a second mixture ratio, further comprising, if the temperature is out of range, adjusting the second mixture ratio