CN212905446U - Sensing head for ultrasonic sensor and ultrasonic sensor - Google Patents

Sensing head for ultrasonic sensor and ultrasonic sensor Download PDF

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Publication number
CN212905446U
CN212905446U CN202021002056.8U CN202021002056U CN212905446U CN 212905446 U CN212905446 U CN 212905446U CN 202021002056 U CN202021002056 U CN 202021002056U CN 212905446 U CN212905446 U CN 212905446U
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China
Prior art keywords
ultrasonic sensor
receiving
sensing head
transmitting
supporting part
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CN202021002056.8U
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Chinese (zh)
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董贵滨
袁勇钢
刘进召
赵浩军
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COLIGEN (CHINA) CORP
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COLIGEN (CHINA) CORP
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The utility model discloses a sensing head for an ultrasonic sensor and an ultrasonic sensor with the sensing head; the sensing head comprises a flat-plate-shaped transmitting and receiving part and a cylindrical supporting part; the receiving and transmitting part is of a circular structure, the diameter of the receiving and transmitting part is the same as the diameter of the radial section of the supporting part, and the receiving and transmitting part is positioned at the top end of the supporting part; two through grooves are formed in the supporting portion and at the position close to the transmitting and receiving portion, the through grooves penetrate through the body of the supporting portion, the length direction of the through grooves is formed along the circumferential direction of the supporting portion, and the two through grooves are symmetrically arranged relative to the central axis of the supporting portion. The utility model discloses a sensing head narrows down the detection angle of a certain direction as required according to the use, when it uses motor vehicles to carry out the distance and survey time measuring, can increase detection distance, be applied to low-speed autopilot and automatic parking and truck, passenger train, machineshop car anticollision field to ultrasonic sensor and have the significance.

Description

Sensing head for ultrasonic sensor and ultrasonic sensor
Technical Field
The utility model relates to an ultrasonic sensor technical field especially relates to an ultrasonic sensor is with sensing head and have this sensing head's ultrasonic sensor.
Background
An ultrasonic sensor is a device that converts a signal from another energy source into a desired ultrasonic signal or energy. The ultrasonic sensor applied to automobile collision avoidance mainly takes a piezoelectric transducer as a main part, when the ultrasonic sensor works, pulse signals of 4-32 periods are generated by an ECU main control according to the frequency of the ultrasonic sensor and actual working requirements, the frequency of the signals is equal to that of the ultrasonic sensor, high-voltage pulses are generated by a pulse amplifying circuit and sent to the ultrasonic sensor, the ultrasonic sensor emits ultrasonic waves, when the ultrasonic signals meet obstacles, the ultrasonic signals are reflected back to be received by the ultrasonic sensor, the signals received by the ultrasonic sensor are amplified by a receiving amplifying circuit and transmitted to the ECU main control, and the ECU main control carries out signal analysis so as to detect the distance of the obstacles.
Conventional ultrasonic sensors for motor vehicles have been used for obstacle detection mainly within 4.5 meters to help drivers avoid colliding with obstacles; with the changing technology in the automobile field, the ultrasonic sensor has higher requirements, that is, the distance measurement is required to be farther.
Referring to fig. 6, the conventional ultrasonic sensor has a beam angle (detection angle) of about 50 degrees in the vertical direction, and if the conventional ultrasonic sensor is used for long-distance detection, the conventional ultrasonic sensor is easy to detect the ground or the crushed stone to generate a false alarm phenomenon, so that the conventional ultrasonic sensor cannot accurately detect an obstacle with a long distance.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a sensing head for an ultrasonic sensor, which solves the problem that the angle of the ultrasonic wave emitted by the ultrasonic sensor is too wide and can not accurately detect the remote barrier; the utility model discloses a first purpose adopts following technical scheme to realize:
a sensing head for an ultrasonic sensor comprises a flat-plate-shaped receiving and transmitting part for receiving and transmitting signals and a cylindrical supporting part; the receiving and transmitting part is of a circular structure, the diameter of the receiving and transmitting part is the same as the diameter of the radial section of the supporting part, and the receiving and transmitting part is positioned at the top end of the supporting part; the supporting part is characterized in that two through grooves are formed in the supporting part and at the position close to the transmitting and receiving part, the through grooves penetrate through the body of the supporting part, the length direction of the through grooves is formed along the circumferential direction of the supporting part, and the two through grooves are symmetrically arranged relative to the central axis of the supporting part.
Specifically, the diameter of the supporting part is between phi 12 mm and phi 16 mm; the straight line length L of the through groove is 5-10 mm, and the width H of the through groove is 0.5-2 mm.
Preferably, the linear length L is 8 mm.
Preferably, the width H is 1 mm.
Specifically, the supporting portion and the transceiver portion are integrally formed.
A second object of the present invention is to provide an ultrasonic sensor using the sensor head according to the first object; the utility model discloses a second purpose adopts following technical scheme to realize:
an ultrasonic sensor comprises a sensor main body, a piezoelectric device and a PCB; the PCB is arranged in the sensor main body and is provided with a plurality of electronic elements; the PCB is electrically connected with the piezoelectric device; the sensor is characterized by further comprising a sensing head of the first technical proposal, wherein the sensing head is arranged at the end part of the sensor main body; the piezoelectric device is tightly attached to the inner side of the transmitting/receiving part of the sensing head.
Specifically, the piezoelectric device is attached to the inside of the transmission/reception unit.
Further, still include the protective sheath, the protective sheath is established on the sensing head, the protective sheath covers logical groove.
Further, the ultrasonic sensor is also provided with a probe which is electrically connected with the outside, and the probe is electrically connected with the PCB.
Preferably, the inside of the ultrasonic sensor is poured with waterproof glue.
The utility model has the advantages of:
the utility model discloses an ultrasonic sensor's sensing head fluting on the supporting part can change the vibration mode of receiving and dispatching portion in a certain direction to can play the effect of narrowing ultrasonic sensor's angle of detection. The ultrasonic sensor of the utility model is applied to the distance detection of the motor vehicle, the detection distance of the ultrasonic sensor can be increased by narrowing the detection angle in the vertical direction, and the false alarm phenomenon caused by the detection of the ground can not be caused; the method has important significance for the application of the ultrasonic sensor in the fields of low-speed automatic driving, automatic parking and truck, passenger car and engineering vehicle collision prevention.
Drawings
Fig. 1 shows a perspective view of a sensor head according to the present invention;
FIG. 2 illustrates a side view of a sensor head of the present invention;
FIG. 3 shows a cross-sectional view of a sensor head of the present invention;
fig. 4 shows a cross-sectional view of an ultrasonic sensor of the present invention;
fig. 5 shows an exploded view of the ultrasonic sensor of the present invention;
FIG. 6 is a diagram showing the detection angle of a motor vehicle in the vertical direction, to which a prior art ultrasonic sensor is applied;
fig. 7 shows the target detection range in the vertical direction of a motor vehicle to which the ultrasonic sensor of the present invention is applied;
fig. 8 is a view showing a detection angle in a vertical direction of a motor vehicle to which the ultrasonic sensor of the present invention is applied;
fig. 9 is a schematic diagram of the detection range of the motor vehicle in the automatic parking process, to which the ultrasonic sensor of the present invention is applied;
fig. 10 is a schematic diagram of the detection range of a motor vehicle in which the ultrasonic sensor of the present invention is applied during low-speed driving;
FIG. 11 is a graph showing a simulation of the detection angle of a prior art ultrasonic sensor;
FIG. 12 is a waveform diagram illustrating the detection angle of an ultrasonic sensor according to the prior art;
fig. 13 is a simulation diagram of the detection angle of the ultrasonic sensor according to the present invention;
fig. 14 shows a waveform diagram of the detection angle of the ultrasonic sensor according to the present invention.
Detailed Description
In order to more clearly understand the technical solution of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In this embodiment, unless otherwise stated, the terms of orientation such as "upper, lower, vertical, axial, front, and back" are generally used with respect to the directions shown in the drawings, but the terms of orientation are not intended to limit the present embodiment.
With reference to fig. 4 and 5, the present embodiment provides an ultrasonic sensor, which includes a sensor body 40, a sensor head 10, a piezoelectric device 20, a protective cover 30, and a PCB 40; sensor head 10 is mounted on the end of sensor body 40; the PCB 50 is disposed inside the sensor body 40, and has a plurality of electronic components thereon; the piezoelectric device 20 is installed inside the sensor head 10, and the PCB 50 is electrically connected with the piezoelectric device 20; the ultrasonic sensor also has a probe 51 electrically connected to the outside, and the probe 51 is electrically connected to the PCB 50. Protective sleeve 30 is fitted over sensor head 10.
Referring to fig. 1 to 3, a sensor head 10 according to the present invention includes a plate-shaped transceiver 11 and a cylindrical support 12; the transceiver 11 is a circular structure, the diameter of the transceiver 11 is the same as the diameter of the radial cross section of the support 12, the transceiver 11 is located at the top end of the support 12, the support 12 is used for supporting the transceiver 11, the support 12 and the transceiver 11 are integrally formed, and the transceiver 11 is located at the end of the ultrasonic sensor and used for transmitting ultrasonic signals outwards and receiving echo signals.
Two through grooves 13 are formed in the support portion 12 at a position close to the transceiver portion 11, the through grooves 13 penetrate through the body of the support portion 12, the through grooves 13 are formed along the circumferential direction of the support portion 12, and the two through grooves 13 are symmetrically arranged with respect to the central axis of the support portion 12. The angle of the ultrasound waves emitted through the head 10 is controlled by controlling the slot length L of the channel 13. Protective cover 30 covers through slots 13 leaving through slots 13 unexposed.
In the present embodiment, the piezoelectric device 20 is a piezoelectric ceramic plate, and the piezoelectric device 20 is bonded and fixed inside the transceiver 11 of the probe.
In some embodiments, sensor head 10 has a natural frequency of vibration of about 51KHz and a natural mode of vibration, such that when a drive pulse signal corresponding to the natural frequency of vibration of sensor head 10 is applied to piezoelectric device 20, piezoelectric device 20 deforms and drives sensor head 10 via adhesive coupling to generate a peak vibration of about 500 nanometers; of course, different diaphragm structures have different vibration modes.
The PCB 50 is loaded with a driving circuit for driving the piezoelectric device 20 to vibrate, and the specific circuit structure thereof may use a circuit structure commonly used in the prior art, which is not described herein again in detail.
The size (the diameter of the radial section of the supporting part 12) of the sensing head of the existing ultrasonic sensor on the market is between phi 12 mm and phi 16 mm; in one embodiment, the slotting length L of the through slot 13 is 5-10 mm, where the slotting length L is a straight line length, a non-arc line length; the width H of the barrel groove 13 is 0.5-2 mm.
With reference to fig. 7, when the ultrasonic sensor of the present invention is applied to a motor vehicle, in order to make the detection distance (target detection range) farther and reduce the erroneous determination, the detection angle of the motor vehicle in the vertical direction needs to be narrowed; in the present embodiment, when the slot length L is 8mm, the detection angle of an ultrasonic sensor to which the sensor head 10 is applied in a certain direction (for example, the vertical direction) is narrowed to 20 degrees, and a detection angle diagram of a motor vehicle to which the embodiment is applied in the vertical direction is given with reference to fig. 8. In a specific embodiment, the width H of the slot is 1mm, which can further facilitate the operation of the slot forming process.
Preferably, the ultrasonic sensor is filled with waterproof glue so as to have a waterproof function.
Referring to fig. 11 and 12, the conventional ultrasonic sensor is not slotted, so that the vibration mode of the transmitting/receiving portion 11 of the sensor head 10 is isotropic, and the vibration region thereof is nearly circular. Referring to fig. 13 and 14, the slotting arrangement of the present application is equivalent to changing the original vibration mode in the affected area of the through slot 13, so that the vibration area is optimized to an elliptical structure. Through the position of adjusting ultrasonic sensor in the use, can realize that ultrasonic sensor is at the transmission angle narrowing of a certain direction, for example adjust ultrasonic sensor's position and let logical groove 13's length direction set up along the horizontal direction, just can narrow ultrasonic sensor in the detection angle of vertical direction.
The utility model discloses an ultrasonic sensor uses and carries out distance detection time measuring at motor vehicles, can increase detection distance, and can not survey ground and arouse the mistake phenomenon of reporting to the police, is applied to low-speed autopilot (refer to fig. 10) and automatic parking (refer to fig. 9) and truck, passenger train, machineshop car anticollision field to ultrasonic sensor and has important meaning.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like without creativity within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A sensing head for an ultrasonic sensor comprises a flat-plate-shaped receiving and transmitting part for receiving and transmitting signals and a cylindrical supporting part; the receiving and transmitting part is of a circular structure, the diameter of the receiving and transmitting part is the same as the diameter of the radial section of the supporting part, and the receiving and transmitting part is positioned at the top end of the supporting part; the supporting part is characterized in that two through grooves are formed in the supporting part and at the position close to the transmitting and receiving part, the through grooves penetrate through the body of the supporting part, the length direction of the through grooves is formed along the circumferential direction of the supporting part, and the two through grooves are symmetrically arranged relative to the central axis of the supporting part.
2. The sensing head of claim 1, wherein the support portion has a diameter of between 12 mm and 16 mm; the straight line length L of the through groove is 5-10 mm, and the width H of the through groove is 0.5-2 mm.
3. The sensing head of claim 2, wherein the linear length L is 8 mm.
4. The sensing head of claim 2, wherein the width H is 1 mm.
5. The sensor head of any of claims 1 to 4, wherein the support portion and the transceiver portion are integrally formed.
6. An ultrasonic sensor comprises a sensor main body, a piezoelectric device and a PCB; the PCB is arranged in the sensor main body and is provided with a plurality of electronic elements; the PCB is electrically connected with the piezoelectric device; the sensor is characterized by further comprising a sensing head as claimed in any one of claims 1 to 5, wherein the sensing head is mounted at the end part of the sensor main body; the piezoelectric device is tightly attached to the inner side of the transmitting/receiving part of the sensing head.
7. The ultrasonic sensor according to claim 6, wherein the piezoelectric device is attached to an inner side of the transmission/reception section.
8. The ultrasonic sensor of claim 6, further comprising a protective sleeve over the sensor head, the protective sleeve covering the through slot.
9. The ultrasonic sensor according to any one of claims 6 to 8, wherein the ultrasonic sensor further has a probe electrically connected to the outside, and the probe is electrically connected to the PCB.
10. The ultrasonic sensor of claim 9, wherein the interior of the ultrasonic sensor is impregnated with a waterproof glue.
CN202021002056.8U 2020-04-30 2020-06-04 Sensing head for ultrasonic sensor and ultrasonic sensor Active CN212905446U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2020207013304 2020-04-30
CN202020701330 2020-04-30

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CN212905446U true CN212905446U (en) 2021-04-06

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CN202021002056.8U Active CN212905446U (en) 2020-04-30 2020-06-04 Sensing head for ultrasonic sensor and ultrasonic sensor

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Application Number Title Priority Date Filing Date
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