CN112444341B - Knock sensor - Google Patents
Knock sensor Download PDFInfo
- Publication number
- CN112444341B CN112444341B CN201910813233.6A CN201910813233A CN112444341B CN 112444341 B CN112444341 B CN 112444341B CN 201910813233 A CN201910813233 A CN 201910813233A CN 112444341 B CN112444341 B CN 112444341B
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- Prior art keywords
- ring
- carrier
- contact ring
- knock sensor
- contact
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/26—Details or accessories
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a knock sensor which comprises a carrier, piezoelectric ceramics arranged on the carrier, a first contact ring, an insulating ring, a second contact ring, a balancing weight and a fixing device. The fixing device is matched with the carrier and used for fixing the piezoelectric ceramic, the first contact ring, the insulating ring, the second contact ring and the balancing weight to the carrier. The first contact ring is in electrical contact with the upper surface of the piezoelectric ceramic, the second contact ring is in electrical contact with the lower surface of the piezoelectric ceramic through the carrier, and the insulating ring is arranged between the first contact ring and the second contact ring. The knock sensor provided by the invention can reduce the acoustic impedance in a vibration wave propagation path and reduce the signal propagation attenuation by reducing one insulating ring. And meanwhile, the manufacturing cost is also reduced.
Description
Technical Field
The invention relates to a knock sensor, in particular to a knock sensor of an engine.
Background
The traditional knock sensor comprises a carrier, piezoelectric ceramic arranged on the carrier, a first contact ring, a first insulating ring, a second contact ring, a balancing weight and a fixing device. Since the acoustic immittance of the insulating ring is very large, when the detonation wave passes through the insulating ring, signal attenuation is caused. Erroneous judgment is easily caused by reading of the knock wave at a relatively long position of the knock sensor.
Disclosure of Invention
The invention aims to provide a knock sensor capable of reducing signal misjudgment.
According to one aspect of the invention, a knock sensor is provided, which includes a carrier, a piezoelectric ceramic disposed on the carrier, a first contact ring, an insulating ring, a second contact ring, a weight block, and a fixing device. The fixing device is matched with the carrier and used for fixing the piezoelectric ceramic, the first contact ring, the insulating ring, the second contact ring and the balancing weight to the carrier. The first contact ring is in electrical contact with the upper surface of the piezoelectric ceramic, the second contact ring is in electrical contact with the lower surface of the piezoelectric ceramic through the carrier, and the insulating ring is arranged between the first contact ring and the second contact ring.
Preferably, the balancing weight is arranged between the fixing device and the second contact ring, and the second contact ring is electrically connected with the lower surface of the piezoelectric ceramic sequentially through the balancing weight, the fixing device and the carrier.
Preferably, the fixing means is a nut, the fixing means being fixed to the carrier by means of a threaded connection.
Preferably, the first contact ring includes a first annular main body portion and a first extending portion extending outward from the first main body portion, the second contact ring includes a second annular main body portion and a second extending portion extending outward from the second main body portion, the first main body portion and the first extending portion are located on the same plane, and the second main body portion and the second extending portion are located on the same plane.
Preferably, the balancing weight is annular, the balancing weight is provided with a notch.
Preferably, the second contact ring is grounded.
Preferably, the carrier comprises a base and a cylindrical part extending from the base, the fixing device is fixed on the cylindrical part, and the piezoelectric ceramic, the first contact ring, the insulating ring, the second contact ring and the counterweight block are fixed between the fixing device and the base.
Preferably, the periphery of base is equipped with first recess, fixing device is the nut, be equipped with the screw thread portion with nut complex on the cylinder portion, the cylinder portion is equipped with the second recess that is located screw thread portion top.
Preferably, the carrier is provided with a mounting hole therethrough.
According to one aspect of the present invention, a knock sensor is provided, which includes a carrier, a piezoelectric ceramic provided on the carrier, a first contact ring, an insulating ring, a second contact ring, a weight block, and a fixing device cooperating with the carrier for fixing the piezoelectric ceramic, the first contact ring, the insulating ring, the second contact ring, and the weight block to the carrier. The first contact ring is in electrical contact with the upper surface of the piezoelectric ceramic, the second contact ring is in electrical contact with the lower surface of the piezoelectric ceramic, the insulating ring is arranged between the first contact ring and the second contact ring, and the second contact ring is arranged above the first contact ring.
The knock sensor provided by the invention can reduce the acoustic impedance in a vibration wave propagation path and reduce the signal propagation attenuation by reducing one insulating ring. And meanwhile, the manufacturing cost is also reduced.
Drawings
Fig. 1 is an exploded perspective view of a knock sensor of the present invention.
Fig. 2 is a sectional view of the knock sensor of the present invention.
Fig. 3 is a perspective view of the knock sensor of the present invention.
Detailed Description
Referring to fig. 1 to 3, the present invention discloses a knock sensor 100, which includes a carrier 7, a piezoelectric ceramic 6 disposed on the carrier 7, a first contact ring 5, an insulating ring 4, a second contact ring 3, a weight block 2, and a fixing device 1. The fixing device 1 cooperates with a carrier 7 for fixing the piezoelectric ceramic 6, the first contact ring 5, the insulating ring 4, the second contact ring 3 and the counterweight 2 to the carrier 7. The first contact ring 5 is in electrical contact with the upper surface 61 of the piezoceramic 6, and the second contact ring 3 is in electrical contact with the lower surface 62 of the piezoceramic 6 via the carrier 7. The insulating ring 4 is arranged between the first contact ring (5) and the second contact ring 3. The second contact ring 3 is arranged above the first contact ring 5. The invention can reduce the acoustic impedance in the vibration wave propagation path and reduce the signal propagation attenuation by reducing one insulating ring. And meanwhile, the manufacturing cost is also reduced.
The counterweight block 2 is annular and is provided with a gap 21. The balancing weight 2 is arranged between the fixing device 1 and the second contact ring 3. The second contact ring 3 is electrically connected with the lower surface 62 of the piezoelectric ceramic 6 through the counterweight block 2, the fixing device 1 and the carrier 7 in sequence. Although in the present embodiment, the weight block 2, the fixing device 1, and the carrier 7 are made of conductive materials, and the second contact ring 3 is electrically connected to the lower surface 62 of the piezoelectric ceramic 6 through the weight block 2, the fixing device 1, and the carrier 7, it also belongs to the protection scope of this patent to electrically connect the second contact ring 3 to the lower surface 62 of the piezoelectric ceramic 6 through other methods. For example, the second contact ring 3 is directly electrically connected to the carrier 7, and then the carrier 7 is electrically connected to the lower surface 62 of the piezoelectric ceramic 6. Or the second contact ring 3 is electrically connected directly to the lower surface 62 of the piezoceramic 6 by means of another electrically conductive material.
The fixing means 1 is a nut and the fixing means 1 is fixed to the carrier 7 by means of a screw connection. In other embodiments, the fastening device 1 can also be fixedly connected to the carrier 7 by means of a snap connection.
The first contact ring 5 includes a first main body 52 having a ring shape and a first extending portion 51 extending outward from the first main body 52. The second contact ring 3 includes a ring-shaped second main body portion 32 and a second extending portion 31 extending outward from the second main body portion 32. The first main body 52 and the first extension 51 are located on the same plane, and the second main body 32 and the second extension 31 are located on the same plane. In the conventional design, the piezoelectric ceramic 6 is provided
Between the first contact ring 5 and the second contact ring 3. Because the thickness of piezoceramics 6 is great, so need bend the extension for the extension that first contact ring and second contact ring are located coplanar as far as possible, so that the welding. In the invention, the insulating ring 4 is arranged between the first contact ring 5 and the second contact ring 3, and the thickness of the insulating ring 4 is small, so that the extending part does not need bending treatment. Compared with the prior art, the processing technology can be reduced, the material usage amount can be reduced, and the manufacturing and material cost can be reduced.
The second contact ring 3 is electrically connected to a ground terminal of an ECU (Electronic Control Unit), and a shielding function is added to protect the signal from interference before the signal is transmitted to the ECU, so as to ensure correct transmission and reading of the signal.
The carrier 7 includes a base 73 and a cylindrical portion 72 extending from the base 73. The fixing device 1 is fixed on the column part 72, and the piezoelectric ceramic 6, the first contact ring 5, the insulating ring 4, the second contact ring 3 and the counterweight block 2 are fixed between the fixing device 1 and the base 73. The carrier 7 is provided with a through mounting hole 74. Knock sensor 100 is mounted to the block of the engine through mounting hole 74.
The base 73 has a first recess 731 around its periphery, the fixing device 1 is a nut, and the column 72 has a screw portion 71 engaged with the nut. The cylindrical portion 72 is provided with a second groove 721 above the threaded portion 71. A housing (not shown) of the knock sensor is injection molded at the time of manufacture. The first and second grooves 731, 721 are bonded to the plastic to provide a sealing effect.
It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
1. The utility model provides a knock sensor, its includes carrier (7), locates piezoceramics (6), first ring (5), insulator ring (4), the second of touching on carrier (7) and touches ring (3), balancing weight (2) and fixing device (1), fixing device (1) and carrier (7) cooperation are used for touching piezoceramics (6), first ring (5), insulator ring (4), second and touch ring (3) and balancing weight (2) and fix carrier (7), its characterized in that, first upper surface (61) electrical contact of touching ring (5) and piezoceramics (6), the second touches ring (3) through lower surface (62) electrical contact of carrier (7) and piezoceramics (6), insulator ring (4) are located first ring (5) and second and are touched between ring (3), balancing weight (2) are located fixing device (1) and second and are touched between ring (3), second touches ring (3) and touches ring (2) and is connected through the electrical ground connection of balancing weight (2), fixing device (1), balancing weight (7) and second are connected with the electrical ground.
2. A knock sensor according to claim 1 in which the fixing means (1) is a nut, the fixing means (1) being secured to the carrier (7) by means of a threaded connection.
3. The knock sensor according to claim 1, wherein the first contact ring (5) includes a first main body portion (52) having an annular shape and a first extension portion (51) extending outward from the first main body portion (52), and the second contact ring (3) includes a second main body portion (32) having an annular shape and a second extension portion (31) extending outward from the second main body portion (32), the first main body portion (52) and the first extension portion (51) are located on the same plane, and the second main body portion (32) and the second extension portion (31) are located on the same plane.
4. A knock sensor according to claim 1 where the mass (2) is annular and where the mass (2) is provided with a gap (21).
5. A knock sensor according to claim 1, where the carrier (7) comprises a base (73) and a cylindrical portion (72) extending from the base (73), the fixing device (1) is fixed to the cylindrical portion (72), and the piezoelectric ceramic (6), the first contact ring (5), the insulating ring (4), the second contact ring (3), and the weight (2) are fixed between the fixing device (1) and the base (73).
6. A knock sensor according to claim 5 in which the base (73) is provided with a first recess (731) about its periphery, the fastening means (1) is a nut, the body (72) is provided with a threaded portion (71) for engaging the nut, and the body (72) is provided with a second recess (721) above the threaded portion (71).
7. A knock sensor according to claim 5 in which the carrier (7) is provided with a through mounting hole (74).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813233.6A CN112444341B (en) | 2019-08-30 | 2019-08-30 | Knock sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813233.6A CN112444341B (en) | 2019-08-30 | 2019-08-30 | Knock sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112444341A CN112444341A (en) | 2021-03-05 |
| CN112444341B true CN112444341B (en) | 2022-10-28 |
Family
ID=74742235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910813233.6A Active CN112444341B (en) | 2019-08-30 | 2019-08-30 | Knock sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112444341B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012114380A1 (en) * | 2011-02-24 | 2012-08-30 | 日本特殊陶業株式会社 | Knocking sensor |
| DE112013006083T5 (en) * | 2012-12-19 | 2015-09-03 | Ngk Spark Plug Co., Ltd. | Non-resonant knock sensor |
| CN204758208U (en) * | 2015-05-22 | 2015-11-11 | 武汉神动汽车电子电器有限公司 | Knock sensor |
| CN205958180U (en) * | 2016-07-20 | 2017-02-15 | 联合汽车电子有限公司 | Knocking sensor |
| CN206459786U (en) * | 2017-02-23 | 2017-09-01 | 大陆汽车电子(长春)有限公司 | Detonation sensor |
-
2019
- 2019-08-30 CN CN201910813233.6A patent/CN112444341B/en active Active
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| Publication number | Publication date |
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| CN112444341A (en) | 2021-03-05 |
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