CN1752727A - Non-resonant impacting sensor - Google Patents
Non-resonant impacting sensor Download PDFInfo
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- CN1752727A CN1752727A CN 200510107531 CN200510107531A CN1752727A CN 1752727 A CN1752727 A CN 1752727A CN 200510107531 CN200510107531 CN 200510107531 CN 200510107531 A CN200510107531 A CN 200510107531A CN 1752727 A CN1752727 A CN 1752727A
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Abstract
To obtain a high output from a nonresonant type knocking sensor without changing a sensor size, in the nonresonant type knocking sensor for detecting vibration generated in an internal combustion engine. A support member fixed with a piezoelectric element and a weight member is constituted of a material of Young's modulus within 1.5-80 GPa, in this nonresonant type knocking sensor. Force applied to the piezoelectric element gets large thereby since the support member gets easy to be expanded/contracted when the vibration is imparted, in the nonresonant type knocking sensor. The output is enhanced thereby without changing a sensor size.
Description
Technical field
The present invention relates to detect the non-resonant impacting sensor of the vibration that produces in the internal combustion engine.
Background technology
In the past, in above-mentioned non-resonant impacting sensor, the body of the support unit of the flange part that stretches out the body with tubular with from this body break-through in order forms the piezoelectric element and the hammer parts of ring-type, piezoelectric element and the hammer parts be fixed under the state on the flange part of support unit in mounting, this be known (for example with reference to patent documentation 1).
Patent documentation 1: the spy opens flat 10-185677 communique
Summary of the invention
For this non-resonant impacting sensor, require to have higher output.As the method for responding this requirement, can consider to add the size of sledgehammer parts, make the hammer parts heavy, thereby piezoelectric element is applied bigger power, obtain the method for big output.
Yet, the occasion that is restricted at the installing space of sensor, for the weight-adding hammer parts add the size of sledgehammer parts, the size of non-resonant impacting sensor self will strengthen.So just can't be installed in sensor in the installing space, the result just is difficult to strengthen output.
Therefore,, the objective of the invention is, can not change the size of sensor and obtain high output from non-resonant impacting sensor for the non-resonant impacting sensor that detects the vibration that produces in the internal combustion engine in view of such problem.
The 1st invention that proposes for the purpose that arrives this is a kind of non-resonant impacting sensor, has: the support unit with body of tubular; Piezoelectric element with reach through hole of the body break-through that is supported parts; Hammer parts with reach through hole of the body break-through that is supported parts; And be supported under the state of body break-through of parts at the reach through hole of piezoelectric element and hammer parts, piezoelectric element and hammer parts are fixed on fixed part on the support unit, it is characterized in that support unit is made of the material of young modulus (ャ Application グ leads) for 1.5GPa～80GPa.
That is, for this non-resonant impacting sensor, when being applied in vibration, support unit is flexible easily, thereby makes the power that puts on piezoelectric element become big.Herein, in the present invention, the lower limit of the young modulus of support unit is made as keeps as the necessary value of the rigidity of non-resonant impacting sensor (1.5GPa).
Therefore, according to such non-resonant impacting sensor, just can not change the size of sensor and improve output.
In addition,, can consider to adopt secure components such as the bolt that engages with the thread groove that forms on the support unit, nut, or piezoelectric element and hammer parts etc. directly is fixed on bonding agent on the support unit etc. as the fixed part among the present invention.
Secondly, in the non-resonant impacting sensor of the 1st invention, the young modulus that constitutes the material of support unit is that 1.5GPa～8OGPa gets final product, and but, more preferably the 2nd invention is put down in writing, and is preferably 2.5GPa～25GPa.
According to such non-resonant impacting sensor, the power that is applied on the piezoelectric element becomes bigger, thereby more can improve output.
In addition, in the present invention, the lower limit of the young modulus of support unit is set for for piezoelectric element that constitutes non-resonant impacting sensor and hammer parts are fastened on necessary value (2.5GPa) on the support unit well.Therefore, according to such non-resonant impacting sensor, just can obtain stable output.
Also have, non-resonant impacting sensor for the 1st invention or the 2nd invention record, preferably the 3rd invention: support unit has the flange part that is provided with axial one distolateral stretching out laterally of body, fixed part is fixed on piezoelectric element and hammer parts on the support unit under piezoelectric element and hammer parts are positioned in state on the flange part of support unit in order.
According to such non-resonant impacting sensor, support unit is that one constitutes, and body and flange part are very close to each other, thereby can improve the water tolerance (water proofing property) of sensor.
But, generally speaking different with the mode of resonance shock transducer for non-resonant impacting sensor, the output of the frequency that the resonance frequency (vibration frequency when sensor is output as maximum) that it uses ratio sensor to export is low.That is, having adopted the impact judgement of non-resonant impacting sensor is to carry out with the output that extractions such as bandpass filter are impacted on the frequency of using in the judgement.
At this moment, the frequency of using in impact judging is according to the kind of internal combustion engine, the air capacity of internal combustion engine etc. and different, thereby just can be equipped on the diversified internal combustion engine for the specification that does not change this sensor, just require the frequency in impact judging, used near, the variation of the frequency when detecting with respect to non-vibration, the variation of output is little.Particularly, if the resonance frequency of sensor output is set highly, so, and the variation of the frequency when detecting with respect to non-vibration, the variation of output is just little.
Herein, in order to improve the resonance frequency of sensor output, for the non-resonant impacting sensor of the 3rd invention record, preferably the 4th invention: support unit is made as, and the axial length of body is 0.25～0.9 with respect to the ratio of the length of stretching out direction of flange part.
Particularly for the non-resonant impacting sensor of the 4th invention record, preferably the 5th invention: support unit is made as, and the axial length of body is 6mm～20mm.
According to such non-resonant impacting sensor, according to experimental result described later, can improve resonance frequency, can reduce variation with respect to the output of the variation of frequency.Therefore, the specification that does not change non-resonant impacting sensor just can be carried on diversified internal combustion engine.
Also have, for the non-resonant impacting sensor of any record in the 1st invention～the 5 invention, preferably the 6th invention: for piezoelectric element, plumbous amount is 0.1 quality % and following.
According to such non-resonant impacting sensor, plumbous amount is few, thereby can reduce the carrying capacity of environment of this non-resonant impacting sensor when discarded.
Have, for the non-resonant impacting sensor of any record in the 1st invention～the 6 invention, preferably, support unit can be made of the material of electric conductivity again, and but, more preferably the 7th invention: support unit is made of the material of insulativity.
According to such non-resonant impacting sensor, need between piezoelectric element and support unit, not play the parts of insulating effect, thereby can cut down component count.
In addition, for the non-resonant impacting sensor of the 7th invention record, preferably the 8th invention: support unit is made of resin or pottery.
According to such non-resonant impacting sensor, need at support unit the necessary conducting forging processing of occasion, cutting processing and the surface treatment of metal just.Also have, if support unit is resinous, just can make support unit, thereby can carry out a large amount of productions of support unit at an easy rate by moulding by casting.
In addition, said pottery is meant pottery, glass, the cement of silicate mineral as raw material among the present invention, or the thing as raw material such as the oxide of various nonmetal, metals, carbide, nitride.
Also have, non-resonant impacting sensor for any record in the 1st invention～the 8 invention, preferably, have the housing on every side that coats these each parts under the state that with fixed part piezoelectric element and hammer parts is fixed on the support unit, the young modulus of this housing is littler than it with the identical of support unit or (more preferably).
According to such non-resonant impacting sensor, when sensor had been applied vibration, the flexible obstruction that just is not vulnerable to housing of support unit just can prevent that the power that puts on piezoelectric element from diminishing.
Description of drawings
Fig. 1 is the front view of the outward appearance of expression non-resonant impacting sensor.
Fig. 2 is the in-built cut-open view of expression non-resonant impacting sensor.
Fig. 3 is the decomposition diagram of the part of the component parts that has in the inside of non-resonant impacting sensor.
Fig. 4 is the young modulus of expression support unit and from the curve of the relation of the output valve of non-resonant impacting sensor.
Fig. 5 is the curve of relation of resonance frequency of the output of expression aspect ratio of support unit and non-resonant impacting sensor.
Embodiment
Followingly embodiments of the present invention are described with reference to accompanying drawing.
[embodiment]
At first, illustrate with reference to Fig. 1 and adopted non-resonant impacting sensor 1 of the present invention (following also be called for short " shock transducer 1 ".)。Fig. 1 is the front view of the outward appearance of expression non-resonant impacting sensor 1.
As shown in Figure 1, the non-resonant impacting sensor 1 of present embodiment has the housing 61 that is made of the insulating material of taking in piezoelectric element 23 component parts such as (with reference to Fig. 2) in inside (PA various resin materials such as (polyamide) etc.).In the present embodiment, housing 61 is by polyamide-based resin (PA66: young modulus 2.9 (GPa)) constitute.
Housing 61 has the element incorporating section 63 and the connector portion 65 that is connected the aerial lug that links to each other with external unit (for example ignition timing control device etc.) that front (upside among Fig. 1) is configured as the cylindrical shape of taper.Connector portion 65 outwards gives prominence to and forms from the periphery wall of element incorporating section 63.
Secondly, the internal structure of shock transducer 1 is described with reference to Fig. 2.Fig. 2 is the in-built cut-open view of expression shock transducer 1.
As shown in Figure 2, shock transducer 1 has support unit 11, rear end side electrod assembly 17, piezoelectric element 23, front electrod assembly 19, hammer parts 31, nut 21 (said fixed part among the present invention), resistive element 27, housing 61 and constitutes.
In the inside of cylindrical portion 12, has the through hole 71 that connects at axis direction.Also have, on the outer peripheral face of the leading section of the outer peripheral face of cylindrical portion 12 and flange part 13, have the slot part 75,76 that is used to improve to the connecting airtight property of housing 61.And the rear end side of the slot part 75 on the outer peripheral face of cylindrical portion 12 has the thread groove 74 that screws togather with nut 21.
Rear end side electrod assembly 17 forms the tubular shape of the periphery of surrounding cylindrical portion 12, contacts with the rear end side of piezoelectric element 23.Also have, this rear end side electrod assembly 17 has the portion of terminal 17a that extends to connector portion 65 from the rear end side of piezoelectric element 23.This portion of terminal 17a uses as the electrical path of the electric signal of exporting from the rear end side of piezoelectric element 23.
The metal material of nut 21 usefulness tubular shape forms, and has formed the thread groove (diagram is omitted) that the thread groove 74 with cylindrical portion 12 screws togather on inner peripheral surface, can screw togather fixing with cylindrical portion 12.In addition, the peripheral shape of nut 21 on the face vertical with axis direction forms polygon (for example hexagon), so that can carry out fastening fixing with instrument etc.
Secondly, the assembling operation of shock transducer 1 is described with reference to Fig. 3.Fig. 3 is the decomposition diagram of the part of the component parts that has in shock transducer 1 inside.
As shown in Figure 3, in the assembling operation of shock transducer 1, at first carry out following operation: surround the periphery of the cylindrical portion 12 on the support unit 11, distolateral forward from rear end side, stacked in order rear end side electrod assembly 17, piezoelectric element 23, front electrod assembly 19 and hammer parts 31.
At this moment, carry out following operation: be electrically connected the portion of terminal 17a of rear end side electrod assembly 17 and the portion of terminal 19a of front electrod assembly 19 by resistive element 27.
Secondly, carry out the operation that the thread groove 74 of nut 21 and support unit 11 screws togather, between the flange part 13 and nut 21 of support unit 11, seize fixedly rear end side electrod assembly 17, piezoelectric element 23, front electrod assembly 1 on both sides by the arms, hammer parts 31 into shape.
After this, carry out following operation: surround this component parts with moulding by casting with mould,, cover this component parts and form housing 61 the insulating material moulding by casting.
Like this, non-resonant impacting sensor 1 has just been made.
In addition, shock transducer 1 forms, and the rear end face of the flange part 13 of support unit 11 exposes from the rear end part of housing 61, and the leading section of the cylindrical portion 12 of support unit 11 exposes from the fore-end of housing 61.Also have, connector portion 65 forms, side within it, and the part of the portion of terminal 19a of the portion of terminal 17a of rear end side electrod assembly 17 and front electrod assembly 19 is exposed.
The mode that contacts with the optimal place (generally being the cylinder district) of internal combustion engine by self rear end side (specifically being the rear end face of the flange part 13 on the support unit 11) of the non-resonant impacting sensor 1 of Gou Chenging and being installed on the internal combustion engine like this.In addition,, for example, can adopt in the through hole 71 of support unit 11 break-through to install and use bolt, installation is fixed by bolts to method on the internal combustion engine as installation method.
So, in internal combustion engine, produce the words of abnormal vibrations such as impact, this abnormal vibrations arrives piezoelectric element 23 with regard to the flange part 13 by support unit 11, according to this abnormal vibrations, the electric signal of exporting from piezoelectric element 23 just outputs to external unit from the portion of terminal 17a of rear end side electrod assembly 17 and the portion of terminal 19a of front electrod assembly 19.
In the non-resonant impacting sensor 1 that has more than described in detail, support unit 11 is that the material (being 20.4GPa in the present embodiment) of 1.5GPa～80GPa constitutes by young modulus.Also have, support unit 11 has the flange part 13 that is provided with axial one distolateral stretching out laterally of body, piezoelectric element 23 and hammer parts 31 are fixed on the support unit 11 by nut 21 under the state on the flange part 13 that is positioned in support unit 11 in order.
Like this, when this non-resonant impacting sensor 1 has been applied vibration, compare with existing shock transducer, support unit 11 is flexible easily, and the power that is applied on the piezoelectric element 23 becomes big.
Therefore, according to this non-resonant impacting sensor 1, the size that does not change sensor just can improve output.
Also have, support unit 11 constitutes for one, and body 12 and flange part 13 are very close to each other, thereby can improve the water tolerance (water proofing property) of sensor.
Particularly in the non-resonant impacting sensor 1 of present embodiment, support unit 11 is made of the material of 2.5GPa～25GPa.
Thereby according to this non-resonant impacting sensor 1, the power that is applied on the piezoelectric element 23 is bigger, more can improve output.
Also have, in this non-resonant impacting sensor 1, support unit 11 is made as, and the axial length of body is made as 0.25～0.9 to the ratio of the length of stretching out direction of flange part 13, and the axial length of body is made as 6mm～2Omm.
Thereby, according to this non-resonant impacting sensor 1,, can improve resonance frequency according to experimental result described later, can reduce the variation with respect to the output of the variation of frequency, the specification that does not change non-resonant impacting sensor 1 just can be carried on diversified internal combustion engine.
Have, in this non-resonant impacting sensor 1, support unit 11 is made of the material of insulativity again.
Thereby, according to this non-resonant impacting sensor 1, need between piezoelectric element 23 and support unit 11, not play the parts of insulating effect, so can cut down component count.
In addition, support unit 11 is made of resin, so support unit 11 does not need to carry out conducting forging processing, cutting is handled and surface treatment.Also have, support unit 11 is resinous, thereby support unit 11 can adopt moulding by casting manufacturing.Therefore, can carry out a large amount of productions of support unit 11 at an easy rate.
Also have, in the structure that Fig. 2 represents, fixed part 21, hammer parts 31, piezoelectric element 23 are to be clipped in structure between housing 61 and the flange part 13 at above-below direction.Therefore, the young modulus of the not only young modulus of support unit 11, and housing 61 all may influence the output of sensor.In the present embodiment, the young modulus of housing 61 is set for a short time than the young modulus of support unit 11, thereby impact sensor 1 has been when having applied vibration, and the flexible obstruction that is not vulnerable to housing 61 of support unit 11 can prevent that the power that is applied on the piezoelectric element 23 from diminishing.
In addition, the flexible such effect of obstruction that is not vulnerable to housing 61 of support unit 11 even the young modulus of housing 61 is identical with support unit 11, also can obtain to a certain extent.
In addition, the mode of enforcement of the present invention is not subjected to the restriction of above-mentioned embodiment at all, so long as in technical scope of the present invention, can adopt variety of way.
For example, in the non-resonant impacting sensor 1 of present embodiment, use the nut 21 (secure component) that engages with the thread groove of formation on the support unit 11, piezoelectric element 23 and hammer parts 31 grades are fixed under the state on the flange part 13 that is positioned in support unit 11, but, can piezoelectric element 23 and hammer parts 31 grades be positioned on the flange part 13, but it directly is fixed on the support unit 11 with for example bonding agent yet.
Also have, on support unit 11, the occasion that does not form flange part 13 on the support unit 11 not needing to form flange part 13 for example, can adopt secure component such as nut 21 to seize piezoelectric element 23 on both sides by the arms from the front of shock transducer 1 and rear end side both sides and holds hammer parts 31 and constitute.
Have again, in the present embodiment, support unit 11 is made of the resin material (PAMXD6) of insulativity, but also can by for example the pottery (with the silicate mineral is pottery, glass, the cement of raw material, be raw material with the oxide of various nonmetal, metals, carbide, nitride etc. perhaps, thing after heat treatment), the material of electric conductivity constitutes.But, constitute the occasion of support unit 11, must between piezoelectric element 23 and support unit 11, dispose the insulating element that the terminal that is used to make piezoelectric element 23 and support unit 11 insulate mutually at material by electric conductivity.
Herein, in the non-resonant impacting sensor 1 of present embodiment, amount plumbous in the piezoelectric element 23 is made as 0.1 quality % and following.
Thereby amount plumbous in this non-resonant impacting sensor 1 is few, thereby can reduce the carrying capacity of environment when discarding this non-resonant impacting sensor 1.
In addition, the piezoelectric element 23 of plumbous amount few (or not leaded) is used for shock transducer, contains plumbous piezoelectric element with PZT etc. and compare, sensor output has the tendency of reduction.To this, in the non-resonant impacting sensor 1 of the formation that has adopted the few piezoelectric element of plumbous amount 23, as the present invention, it is effectively constituting support unit 11 with the material of 1.5GPa～80GPa.Like this, in the occasion that the plumbous few piezoelectric element of amount is used for shock transducer, also can obtain high sensor output.
In addition, piezoelectric element 23 also can contain plumbous material by PZT etc. and constitutes.
Herein, the applicant tests in order to prove above-mentioned effect.Below represent this experimental example.
[experimental example 1]
In this experimental example (experimental example 1), under the situation of the young modulus that changes the material that constitutes support unit 11, measured output valve from non-resonant impacting sensor 1.Herein, Fig. 4 represents the young modulus of support unit 11 and from the curve of the relation of the output valve of non-resonant impacting sensor 1.
In this experimental example, the material of support unit 11 has used
(1) iron (SWCH25K): young modulus 215GPa (comparative example),
(2) aluminium: young modulus 70.3GPa,
(3) PAMXD6 (polyamide-based resin, Mitsubishi's engineering plastics system): young modulus 20.4GPa,
(4) PA66: young modulus 2.9GPa
These 4 kinds.Also have, vibration frequency is 4.5kHz.What in addition, employed hammer parts 31 and piezoelectric element 23 and embodiment represented is identical.
This result of experiment as shown in Figure 4, the output valve of the shock transducer 1 that is made of SWCH25K from support unit 11 is about 30mV, and come free young modulus be the output valve of the shock transducer 1 that constitutes of 80GPa and following support unit 11 (aluminium, PAMXD6, PA66) be 35mV and more than.Particularly the output valve of the shock transducer 1 that is made of PA66 from support unit 11 is about 44mV.
Also have,, confirmed to diminish, will become big such tendency from the output of shock transducer 1 along with the young modulus of support unit 11 according to this result of experiment.
Thereby proved with constitute above-mentioned embodiment in the relevant effect of young modulus of material of the support unit 11 put down in writing.
In addition, in view of material behavior etc., the applicant thinks, the value of keeping as the young modulus of the necessary support unit 11 of the rigidity of non-resonant impacting sensor 1 is the degree of 1.5GPa.Also think, if the value of the young modulus of support unit 11 be 2.5GPa degree and more than, just can and hammer parts 31 into shape and be fastened on well on the support unit 11 the piezoelectric element 23 that constitutes non-resonant impacting sensor 1.
[experimental example 2]
In this experimental example (experimental example 2), the ratio of width (is also referred to as aspect ratio at the height that changes support unit 11.That is, the axial length of cylindrical portion 12 is to the ratio of the length of stretching out direction of flange part 13) situation under, measured resonance frequency from the output valve of non-resonant impacting sensor 1 (that is the frequency when being maximum) from the output valve of shock transducer 1.Herein, Fig. 5 represents the aspect ratio of support unit 11 and from the curve of the relation of the output valve of non-resonant impacting sensor 1.
In this experimental example, support unit 11 is made of PAMXD6 (Mitsubishi's engineering plastics system), and the size of support unit 11 is made as, and width is 23mm, is constant, and height changes by 20mm～6.5mm, thereby changes the aspect ratio of support unit 11.
Also have, in this experimental example, the height of support unit 11 is:
(1) height 20mm, aspect ratio 0.87 (comparative example),
(2) height 14mm, aspect ratio 0.61,
(3) height 13mm, aspect ratio 0.57,
(4) height 12.3mm, aspect ratio 0.54,
(5) height 12mm, aspect ratio 0.52
(6) height 6.5mm, aspect ratio 0.28.
Also have, piezoelectric element 23 is identical with experimental example 1.In addition, hammer parts 31 make aluminum, thick 2.5mm.
This result of experiment as shown in Figure 5, the aspect ratio of support unit 11 is that the resonance frequency of 0.87 shock transducer 1 is about 25kHz, and the aspect ratio of support unit 11 be 0.61 and the resonance frequency of following shock transducer 1 be 28kHz and more than.Particularly the aspect ratio of support unit 11 is that 0.54 resonance frequency that reaches following shock transducer 1 is more than 31kHz reaches.
Also have, test this result according to this, confirmed to diminish along with the aspect ratio of support unit 11, the resonance frequency of shock transducer 1 will become big such tendency.
Thereby proved with above-mentioned embodiment in the aspect ratio of the support unit 11 put down in writing and the relevant effect of relation of resonance frequency.
Claims (10)
1. non-resonant impacting sensor comprises:
Support unit with body of tubular;
Piezoelectric element with reach through hole of the body break-through that supplies described support unit;
Hammer parts with reach through hole of the body break-through that supplies described support unit; And
Described piezoelectric element and described hammer parts are fixed on the described support unit, thereby make the fixed part of the reach through hole of the described piezoelectric element of body break-through of described support unit and described hammer parts,
Wherein, described support unit is that the material of 1.5GPa～80GPa is made by young modulus.
2. non-resonant impacting sensor according to claim 1, wherein, described support unit is that the material of 2.5GPa～25GPa is made by young modulus.
3. non-resonant impacting sensor according to claim 1 and 2, wherein,
Described support unit comprises the axial one distolateral flange part that stretches out laterally from described body,
Described fixed part is fixed on described piezoelectric element and described hammer parts on the described support unit, thereby described piezoelectric element and described hammer parts are positioned on the flange part of described support unit in order.
4. non-resonant impacting sensor according to claim 3, wherein, the axial length of described body is 0.25～0.9 with respect to the ratio of the length of stretching out direction of described flange part.
5. non-resonant impacting sensor according to claim 4, wherein, described body is 6mm～20mm in axial length.
6. non-resonant impacting sensor according to claim 1 and 2, wherein, described piezoelectric element contains lead, and plumbous amount is 0.1 quality % and following in the described piezoelectric element.
7. non-resonant impacting sensor according to claim 1 and 2, wherein, described support unit is made by the material of insulativity.
8. non-resonant impacting sensor according to claim 7, wherein, described support unit is made by resin or stupalith.
9. non-resonant impacting sensor according to claim 1 and 2, wherein, also comprise and coat described piezoelectric element, described hammer parts, described fixed part and described support unit, thereby by described fixed part described piezoelectric element and described hammer parts are fixed on housing on the described fixed part, the young modulus of described housing is identical or littler than it with described support unit.
10. non-resonant impacting sensor according to claim 3, wherein, also comprise with the external part of the flange part of described support unit with from an end of the body of the outstanding described support unit of described fixed part and combining, thereby coat the housing of described piezoelectric element, described hammer parts and described fixed part, the young modulus of described housing is identical or littler than it with described support unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004277189 | 2004-09-24 | ||
| JP2004277189A JP2006090865A (en) | 2004-09-24 | 2004-09-24 | Nonresonant type knocking sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1752727A true CN1752727A (en) | 2006-03-29 |
| CN100447544C CN100447544C (en) | 2008-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101075311A Expired - Fee Related CN100447544C (en) | 2004-09-24 | 2005-09-26 | Non-resonant impacting sensor |
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| JP (1) | JP2006090865A (en) |
| CN (1) | CN100447544C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105339768A (en) * | 2013-06-25 | 2016-02-17 | 日本特殊陶业株式会社 | Knocking sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5331345B2 (en) * | 2008-01-24 | 2013-10-30 | 日本特殊陶業株式会社 | Knocking sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19727703A1 (en) * | 1997-06-30 | 1999-01-14 | Bosch Gmbh Robert | Vibration sensor with pressure sleeve |
| JP3562402B2 (en) * | 1999-09-29 | 2004-09-08 | 株式会社村田製作所 | Piezoelectric ceramic material and surface wave device using the same |
| JP2002005952A (en) * | 2000-06-21 | 2002-01-09 | Matsushita Electric Ind Co Ltd | Acceleration sensor |
-
2004
- 2004-09-24 JP JP2004277189A patent/JP2006090865A/en active Pending
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2005
- 2005-09-26 CN CNB2005101075311A patent/CN100447544C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105339768A (en) * | 2013-06-25 | 2016-02-17 | 日本特殊陶业株式会社 | Knocking sensor |
| US10094727B2 (en) | 2013-06-25 | 2018-10-09 | Ngk Spark Plug Co., Ltd. | Knocking sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006090865A (en) | 2006-04-06 |
| CN100447544C (en) | 2008-12-31 |
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