CN212181016U

CN212181016U - Reversing radar

Info

Publication number: CN212181016U
Application number: CN202020559863.3U
Authority: CN
Inventors: 朱一安; 关鑫; 麻志鹏
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2020-12-18
Anticipated expiration: 2030-04-15

Abstract

The utility model provides a radar of backing a car, has solved current radar of backing a car that adopts ultrasonic sensor and has easily appeared measuring blind area and when backing a car the problem that easily takes place to fall into the bank, belongs to the vehicle and backs a car the auxiliary field. The utility model comprises a controller, five ultrasonic sensors, a buzzer and a display, which are respectively arranged at the front end and the rear end of the automobile, wherein one probe faces the ground and is used for detecting the ditch ridge at the rear end of the automobile; the top of ultrasonic sensor's piezoelectric chip is equipped with the protective layer, ultrasonic sensor's piezoelectric chip has last coverboard and lower coverboard with bottom side parcel all around, is provided with the damping layer between last coverboard and the lower coverboard, and piezoelectric chip's damping layer all around is the slope form, and the material of going up coverboard and lower coverboard is the flexible glue. The flexible glue and the damping layer provide damping force for residual vibration generated by the piezoelectric chip, the damping layer is inclined, and the vibration borne by the damping layer is decomposed into horizontal and vertical directions, so that the vibration is effectively reduced, and the measurement blind area is further reduced.

Description

Reversing radar

Technical Field

The utility model relates to a radar of backing a car belongs to the vehicle and backs a car the supplementary field.

Background

The reversing radar is a quiet auxiliary device for the car to be reversed when the car is parked, and is mostly composed of an ultrasonic sensor, a controller and a buzzer.

The reverse radar informs the driver of the surrounding environment in a sound intuitive expression, eliminates troubles caused by front-back, left-right and visitation when the driver parks, backs and starts a vehicle, and helps the driver to clean the defects of angle of sight removal and blurred vision.

The car backing radar detects the distance between the car tail and the object behind the car through an ultrasonic technology, and when the distance between the car tail and the object behind the car is smaller than a set value, an alarm is sent out to warn a driver. The existing reversing radar adopting ultrasonic waves is insensitive to detecting over-thin and over-short obstacles, cannot detect a ditch bank and is easy to fall into the ditch bank in reversing. When the temperature of an ultrasonic sensor equipped in the existing reversing radar changes by 5-10 degrees or more, the performance of the ultrasonic sensor changes along with the temperature change, so that aftervibration of the ultrasonic sensor can be caused, the sensitivity of the ultrasonic sensor changes, a measuring blind area appears, and the phenomenon of misinformation or failure is easy to appear.

Disclosure of Invention

The problem that the measurement blind area easily appears and easily takes place to fall into the bank of a river when backing a car to current radar of backing a car that adopts ultrasonic sensor, the utility model provides a detect bank of a river and reduce the radar of backing a car of measuring the blind area.

The utility model discloses a radar for backing a car, the radar includes controller, five ultrasonic sensor 1, bee calling organ and display, wherein two ultrasonic sensor 1 are installed at the front end of car, are used for detecting car front end barrier, and two ultrasonic sensor 1 are installed at the rear end of car, are used for detecting car rear end barrier; the fifth ultrasonic sensor 1 is arranged at the rear end of the automobile, and a probe of the fifth ultrasonic sensor faces the ground and is used for detecting a ditch ridge at the rear end of the automobile;

the detection signal output ends of the five ultrasonic sensors 1 are connected with the detection signal input end of a controller, the alarm signal output end of the controller is connected with the alarm signal input end of a buzzer, and the barrier distance display data output end of the controller is connected with the barrier distance display data input end of a display;

the top of ultrasonic sensor 1's piezoelectric chip 13 is equipped with protective layer 12, ultrasonic sensor 1's piezoelectric chip 13 is all around with bottom side parcel have upper casing board 15 and lower casing board 17, is provided with damping layer 16 between upper casing board 15 and the lower casing board 17, and piezoelectric chip 13's damping layer 16 all around is the slope form, and upper casing board 15 and lower casing board 17's material are the flexible glue.

Preferably, the reversing radar also comprises a fixed seat 2, an expansion link 3 and a cylinder 4,

an output shaft of the cylinder 4 is fixedly connected with one end of the telescopic rod 3, and the other end of the telescopic rod 3 is fixedly connected with one side of the fixed seat 2;

the fixed seat 2 is arranged at the rear end of the automobile, and the other side of the fixed seat 2 is used for mounting a fifth ultrasonic sensor 1;

the drive control output end of the controller is connected with the drive control input end of the air cylinder 4.

Preferably, an integrated partition board is arranged in the shell of the ultrasonic sensor 1 and is divided into an upper cavity and a lower cavity, the upper cavity is used for placing the wrapped piezoelectric chip 13, the partition board is provided with threading holes of the upper cavity and the lower cavity, and the lower cavity is used as a threading cavity.

The beneficial effects of the utility model reside in that, the utility model discloses when backing a car, the radar that backs a car begins to work, and in case the barrier appears at the car rear portion behind the ultrasonic sensor's of car rear end signal transmission, the ultrasonic wave is reflected by the barrier, and ultrasonic sensor will receive the back wave signal. The controller judges the position of the obstacle and the distance between the obstacle and the vehicle body as prompt information by processing the reflected ultrasonic wave signal. The utility model discloses increase an ultrasonic sensor in car rear end, probe direction is towards ground, and the barrier distance that this ultrasonic sensor of control device surveyed is compared with standard distance, also as prompt message to give the driver prompt message feedback through bee calling organ and display, realize the detection of car back obstacle and bank and dodge the suggestion. The utility model discloses surface parcel at ultrasonic sensor piezoelectric chip has flexible glue, and is provided with the damping layer in the flexible glue, produces the aftervibration when piezoelectric chip, and flexible glue and damping layer provide damping force for the aftervibration that piezoelectric chip produced, and the suppression vibration reduces and measures the blind area. And simultaneously, the utility model discloses a damping layer is the slope form, decomposes into level and vertical direction with the vibration that receives, effectively reduces the vibration, further reduces and measures the blind area.

Drawings

Fig. 1 is a schematic view of the installation of the present invention;

fig. 2 is a schematic structural diagram of the ultrasonic sensor of the present invention;

fig. 3 is a schematic view illustrating the installation of the ultrasonic sensor for detecting the sill according to the present invention;

fig. 4 is an electrical schematic diagram of the controller of the present invention.

Detailed Description

The embodiment is described with reference to fig. 1, and the reversing radar of the embodiment includes a controller, five ultrasonic sensors 1, a buzzer and a display, wherein two ultrasonic sensors 1 are installed at the front end of an automobile and used for detecting obstacles at the front end of the automobile, and the other two ultrasonic sensors 1 are installed at the rear end of the automobile and used for detecting obstacles at the rear end of the automobile; the fifth ultrasonic sensor 1 is arranged at the rear end of the automobile, and a probe of the fifth ultrasonic sensor faces the ground and is used for detecting a ditch ridge at the rear end of the automobile;

the ultrasonic sensor 1 of the TCF40-16TRC type is used in the embodiment, and the sensor of the type also has a waterproof function.

The coverage range of a single ultrasonic sensor 1 is limited, the blind area is large, the number of the ultrasonic sensors is large, the measurement blind area is small, but the sound wave crosstalk condition among the ultrasonic sensors 1 is more serious, and inconvenience is also brought to the installation of the ultrasonic sensors. By balancing the above two factors, the present embodiment selects four ultrasonic sensors 1 integrated with each other for front and rear obstacle detection, thereby achieving a relatively optimal effect. When the reversing radar starts to work, after the signal of the ultrasonic sensor 1 at the rear end of the automobile is transmitted, once an obstacle appears at the rear part of the automobile, the ultrasonic wave is reflected by the obstacle, and the ultrasonic sensor 1 receives a reflected wave signal. The controller judges the position of the obstacle and the distance between the obstacle and the vehicle body as prompt information by processing the reflected ultrasonic wave signal. The controller shows this prompt message on the display, utilizes bee calling organ to indicate simultaneously, and bee calling organ can send different chimes of doom according to the distance difference of barrier, and the farthest of the ultrasonic sensor 1 of both sides is listened apart from being 90 centimetres around, and the chimes of doom is divided into the three-section:

the probe direction of a fifth ultrasonic sensor at the rear end of the automobile faces the ground, the distance of the obstacle detected by the ultrasonic sensor is compared with the standard distance by the control device and also used as prompt information, and the prompt information is fed back to a driver through the buzzer and the display, so that the detection and avoidance prompt of the obstacle and the ditch bank behind the automobile are realized. The registration distance of the present embodiment is related to the height of the mounting position.

The controller of the present embodiment employs a chip GM3101, whose main performance parameters are, as shown in fig. 4: the working temperature is-40 ℃ to +85 ℃; the power supply voltage is 5V; the detection range is 0.3-3.95 meters, and the detection precision is 0.05 meters; the alarm output period is 150.4 ms. Five ultrasonic sensors 1 sample in turn and output alarm data once, and alarm signals are output by adopting a double-line differential mode. The alarm signal includes: the system comprises a danger level signal, a nearest obstacle position signal, a nearest obstacle distance signal and an additional message, wherein the danger level signal, the nearest obstacle position signal, the nearest obstacle distance signal and the additional message are detected by each probe.

Because the probe adopted by the ultrasonic sensor 1 is a piezoelectric ceramic probe, when the probe emits 16 ultrasonic waves outwards, the reflection of the probe can generate a part of residual vibration, and the signal amplitude of the residual vibration changes from large to small. The residual oscillation time is different because the probes used by the users are different, and generally, the residual oscillation time is 1.5 ms-2 ms. Because residual oscillation appears on the channel, the detected signals are submerged by the residual oscillation within the residual oscillation time, useful signals cannot be detected within the residual oscillation time, and the corresponding distance cannot be measured. If the residual vibration is not eliminated, the residual vibration is taken as a useful signal, and an error alarm signal is output.

The chip GM3101 of the present embodiment effectively treats the aftervibration of the ultrasonic probe in the following respects.

In this embodiment, the residual oscillation amplitude can be clamped to ± 0.7V by clamping at the input terminal of the chip GM 3101. If the clamp processing is not performed, the aftervibration time is increased in the post-amplification stage.

Two operational amplifiers and resistors inside the chip GM3101 form an amplifying circuit, and after signals are amplified by the amplifying circuit, the signals enter a residual vibration processing circuit, and residual vibration is completely eliminated through the residual vibration processing circuit.

Residual vibration is shielded in the first-stage amplifying circuit, and if the residual vibration is not completely eliminated in the first-stage amplifying circuit, the residual vibration which is not eliminated can be processed through a residual vibration shielding circuit in the peak value detection circuit.

The ultrasonic echo signals emitted by the short-distance object are strong, and the signals emitted by the long-distance object are weak. If a long-distance object needs to be detected, the amplification factor needs to be increased, and the residual vibration can be correspondingly amplified, so that the difficulty is brought to shielding the residual vibration later. The present embodiment employs an automatic gain selector to solve this problem. For long-distance objects, the magnification is larger, and for short-distance objects, the magnification is smaller. In the second stage amplifier, different amplification factors can be adopted according to different object distances.

In order to further suppress residual vibration, in the present embodiment, a protective layer 12 is disposed on a top end of a piezoelectric chip 13 of the ultrasonic sensor 1, an upper shell plate 15 and a lower shell plate 17 are wrapped around and at a bottom side of the piezoelectric chip 13 of the ultrasonic sensor 1, a damping layer 16 is disposed between the upper shell plate 15 and the lower shell plate 17, the damping layer 16 around the piezoelectric chip 13 is inclined, and the upper shell plate 15 and the lower shell plate 17 are made of a flexible adhesive.

When the piezoelectric chip generates residual vibration, the flexible glue and the damping layer of the embodiment provide damping force for the residual vibration generated by the piezoelectric chip, so that vibration is inhibited, and a measuring blind area is reduced. Meanwhile, the damping layer is inclined, so that the vibration borne by the damping layer is decomposed into horizontal and vertical directions, the vibration is effectively reduced, and the measurement blind area is further reduced.

In the embodiment, epoxy is used as a carrier, glass beads and a curing agent are added, and then an epoxy silane coupling agent is added and the mixture is vacuumized and stirred uniformly to form a pasty protective layer 12.

The damping layer of the embodiment is made of a viscoelastic blending type damping material, and can also be made of a rubber material, the rubber elastomer can convert mechanical energy into heat energy under the action of alternating stress due to the specific viscoelasticity of the rubber elastomer, and the energy consumption is dissipated, the rubber material adopted by the embodiment is an NR/ENR-25/ENR-40/ENR-50 quaternary blending damping material which is prepared by taking epoxidized natural rubber (ENR-25, ENR-40 and ENR-50) as a base material and adopting a conventional blending method and a gradient laminating method, the effective damping temperature range can be from-28.4 ℃ to 39.4 ℃, the tensile strength can reach 5.5MPa, and the elongation at break is 642%. This is prior art and the skilled person will refer to the prior art to make or buy the finished product himself. Note also that the larger the volume of the fill layer, the more vibration energy is dissipated.

As shown in fig. 3, the reversing radar of the present embodiment further includes a fixed base 2, an expansion link 3 and a cylinder 4,

an output shaft of the cylinder 4 of the embodiment is fixedly connected with one end of the telescopic rod 3, and the other end of the telescopic rod 3 is fixedly connected with one side of the fixed seat 2;

When backing a car, the controller drives the work of actuating cylinder 4, makes telescopic link 3 extension, and telescopic link 3 is under the complete stretching out state, and ultrasonic sensor's on the 3 other end fixing bases 2 of telescopic link probe 10 is down, and the controller lies in ultrasonic sensor's control, acquires ultrasonic sensor's range finding data as initial distance during the installation, when receiving the signal of backing a car during the use, acquires ultrasonic sensor's range finding data as current distance in real time, confirms the controller through the difference of current distance and initial distance and sends the display signal to the display to whether control bee calling organ is reported to the police. And sending an obstacle signal when the difference value between the current distance and the initial distance is smaller than a preset threshold value, and sending a ditch sill signal when the difference value between the current distance and the initial distance is larger than the preset threshold value. The ultrasonic sensor is fixed by the telescopic rod structure, which is not stable enough and is easy to vibrate, but the vibration can be suppressed because the vibration is reduced by wrapping the piezoelectric chip in the present embodiment.

The structure of the ultrasonic sensor 1 of the present embodiment is as shown in fig. 2, a base 14 is disposed at the bottom of a housing 11 of the ultrasonic sensor 1 of the present embodiment, an integrated partition board is disposed in the housing 11 and is divided into an upper cavity and a lower cavity, the upper cavity is used for placing a wrapped piezoelectric chip 13, a threading hole 18 is disposed on the partition board, and the lower cavity is used as a threading cavity 19.

The present embodiment is provided with a wire cavity 19 for placing the circuit board and the connecting wires between the circuit board and the piezoelectric chip 13.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. The reversing radar is characterized by comprising a controller, five ultrasonic sensors (1), a buzzer and a display, wherein two ultrasonic sensors (1) are arranged at the front end of an automobile and used for detecting obstacles at the front end of the automobile, and the other two ultrasonic sensors (1) are arranged at the rear end of the automobile and used for detecting obstacles at the rear end of the automobile; the fifth ultrasonic sensor (1) is arranged at the rear end of the automobile, and a probe of the fifth ultrasonic sensor faces the ground and is used for detecting a ditch ridge at the rear end of the automobile;

the detection signal output ends of the five ultrasonic sensors (1) are connected with the detection signal input end of the controller, the alarm signal output end of the controller is connected with the alarm signal input end of the buzzer, and the barrier distance display data output end of the controller is connected with the barrier distance display data input end of the display;

the ultrasonic sensor is characterized in that a protective layer (12) is arranged on the top end of a piezoelectric chip (13) of the ultrasonic sensor (1), an upper shell plate (15) and a lower shell plate (17) are wrapped on the periphery and the bottom side of the piezoelectric chip (13) of the ultrasonic sensor (1), a damping layer (16) is arranged between the upper shell plate (15) and the lower shell plate (17), the damping layer (16) on the periphery of the piezoelectric chip (13) is inclined, and the upper shell plate (15) and the lower shell plate (17) are made of flexible glue.

2. The reversing radar according to claim 1, characterised in that it further comprises a fixed mount (2), a telescopic rod (3) and a cylinder (4),

an output shaft of the air cylinder (4) is fixedly connected with one end of the telescopic rod (3), and the other end of the telescopic rod (3) is fixedly connected with one side of the fixed seat (2);

the fixed seat (2) is arranged at the rear end of the automobile, and the other side of the fixed seat (2) is used for mounting a fifth ultrasonic sensor (1);

the drive control output end of the controller is connected with the drive control input end of the air cylinder (4).

3. The reversing radar according to claim 1, characterized in that an integrated partition board is arranged in the shell of the ultrasonic sensor (1) and is divided into an upper cavity and a lower cavity, the upper cavity is used for placing the wrapped piezoelectric chip (13), the partition board is provided with threading holes of the upper cavity and the lower cavity, and the lower cavity is used as a threading cavity.