CN111815974A - Curve speed measuring and calculating indicator based on piezoelectric induction technology - Google Patents
Curve speed measuring and calculating indicator based on piezoelectric induction technology Download PDFInfo
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- CN111815974A CN111815974A CN201910292230.2A CN201910292230A CN111815974A CN 111815974 A CN111815974 A CN 111815974A CN 201910292230 A CN201910292230 A CN 201910292230A CN 111815974 A CN111815974 A CN 111815974A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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Abstract
A curve speed measuring and calculating indicator based on a piezoelectric sensing technology relates to a vehicle testing technology. The method overcomes the defects of the method for increasing the visual field of the driver by arranging the wide-angle lens at the curve. The indicator comprises two piezoelectric induction belts, a calculation module and a display module, wherein: the piezoelectric induction belt is used for inducing vehicle induction information of a running vehicle on a road and sending the vehicle induction information to the calculation module; the calculation module is used for calculating and obtaining vehicle information of a corresponding vehicle according to the vehicle induction information sent by each piezoelectric induction zone, further calculating and obtaining the maximum safe speed of the lane where each piezoelectric induction zone is located, and sending the maximum safe speed to the display module; and the display module is provided with two display screens which are respectively used for displaying the maximum safe speed corresponding to the two piezoelectric induction belts. The invention provides a brand-new way for prompting the driver to safely drive at the curve of the traffic road, which is more intuitive and is suitable for being arranged at the curve of various motor vehicles.
Description
Technical Field
The invention relates to a vehicle testing technology, and belongs to the technical field of vehicle speed measurement.
Background
In road safety management, if an object with a large volume exists at a position of a curve to block the view of a driver of a vehicle turning the road, for example, at places such as a mountain road, a parking lot road and the like, a convex mirror, also called a wide-angle mirror, is adopted to realize the function of expanding the view of the driver. When a driver drives to the position near the curve and is ready to turn, the driver can know the condition of the other end of the road through the wide-angle lens, and then can find the vehicle opposite to the curve as soon as possible, thereby avoiding the functions of scraping and colliding with the oncoming vehicle and the like, and finally reducing the occurrence of traffic accidents caused by obstacles.
The wide-angle lens is a convex reflector made of PC materials mostly, and has the advantages of impact resistance, consolidation, strong durability and anti-fragmentation performance; in addition, most wide-angle lenses are provided with lens covers for reducing the corrosion of the lens surfaces caused by exposure to sunlight and rain; moreover, the reverse side of the mirror is made of glass fiber reinforced plastics, so that the possibility that metal materials are easy to rust and stolen is avoided.
However, in practical applications, the wide-angle lens has drawbacks, mainly:
1. in a sunny day, the reflection of the mirror surface to sunlight sometimes causes discomfort to a driver, so that the insecurity of the corner is increased.
2. The wide-angle mirror is a convex mirror, and objects reflected by the wide-angle mirror are all deformed, so that an inexperienced driver cannot accurately judge the size, distance and speed of a coming vehicle under the influence of the deformed objects, and further cannot take effective measures to avoid traffic accidents.
Disclosure of Invention
The invention aims to overcome the defects of a method for increasing the visual field of a driver by arranging a wide-angle lens at a curve.
The curve speed measuring and calculating indicator based on the piezoelectric sensing technology comprises two piezoelectric sensing belts, a calculating module and a display module, wherein:
the piezoelectric induction belt is used for inducing vehicle induction information of a running vehicle on a road and sending the vehicle induction information to the calculation module;
the calculation module is used for calculating and obtaining vehicle information of a corresponding vehicle according to the vehicle induction information sent by each piezoelectric induction zone, further calculating and obtaining the maximum safe speed of the lane where each piezoelectric induction zone is located, and sending the maximum safe speed to the display module;
and the display module is provided with two display screens which are respectively used for displaying the maximum safe speed corresponding to the two piezoelectric induction belts. Preferably, the display screen is an LED display screen or an LCD display screen.
The arrangement condition of the curve speed measuring and calculating indicator at the curve is as follows: the method comprises the following steps of respectively embedding two piezoelectric induction belts under the road surfaces of the entrances of the two lanes running oppositely, wherein the width of each piezoelectric induction belt corresponds to the width of the lane where the piezoelectric induction belt is located. The display module is fixed on the roadside on the outer radius side of the curve turn, namely: the position of the existing wide-angle lens, and then two display screens of the display module face to the vehicle running direction of two lanes respectively.
In practical application, when a vehicle on any lane is about to enter a curve, the piezoelectric induction band on the lane detects and obtains relevant information of the vehicle, the calculation module calculates and obtains the maximum safe speed of the opposite vehicle through the information, the display screen facing the lane in the display module displays the maximum safe speed, a driver of the vehicle sees the maximum safe speed, and the vehicle speed is controlled to be below the maximum safe speed to drive through the curve.
Furthermore, the piezoelectric induction band is composed of a plurality of piezoelectric induction ceramic strips which are parallel to each other, and the piezoelectric induction ceramic strips are parallel to the driving direction of the road where the piezoelectric induction ceramic strips are located in practical application. The piezoelectric induction belt is arranged under the road surface, and the working principle of the piezoelectric induction belt is the principle of utilizing the direct piezoelectric effect: when a vehicle runs and presses the piezoelectric induction belt, the piezoelectric induction ceramic strip generates a polarization phenomenon inside the piezoelectric induction ceramic strip under the action of the gravity of the vehicle, charges with opposite signs are generated on the two surfaces of the piezoelectric induction ceramic strip, and the charge quantity generated by stress is in direct proportion to the magnitude of external force, so that the passing of the vehicle is detected, and the mass and the running speed of the passing vehicle can be measured.
The principle that the calculation module calculates and obtains the maximum safe speed of the oncoming vehicle according to the induction information sent by each piezoelectric induction band is as follows: according to the turning radius R of the curve where the piezoelectric induction belt is located and the static friction coefficient of the ground at the position where the piezoelectric induction belt is located, the driving state relative to the vehicle can be calculated and obtained by combining the vehicle mass and the speed information, and the maximum speed of the coming vehicle in the opposite lane can be safely driven without accidents, namely: maximum safe speed.
The curve speed measuring and calculating indicator does not adopt the conventional design idea of feeding back road surface images through equipment such as a mirror surface and the like, so that the defects of a wide-angle lens are completely avoided. The invention develops a new method, which is to prompt the maximum safe speed when the vehicle is about to drive into a curve and inform the driver to control the vehicle running speed to be lower than the maximum safe running speed.
By adopting the curve speed measuring and calculating indicator, when a driver approaches a curve, the driver does not need to judge the size, distance or speed of the coming vehicle of an object through vision and driving experience, then controls the driving speed and track of the driver according to the judgment result, and the driver only needs to control the vehicle speed to be below the highest safe vehicle speed displayed in the display for driving. The mode is irrelevant to the driving experience of the driver, the driver does not need to judge and analyze, and only the driver needs to control the speed according to the prompt, so that the traffic accident can be effectively avoided.
The curve speed measuring and calculating indicator can replace a wide-angle lens arranged at the conventional curve, is suitable for being arranged at the curve of various motor vehicle lanes, and can adjust the arrangement positions of the two piezoelectric induction belts according to the specific conditions of the curve in practical application so as to achieve the purpose of timely prompting a driver to adjust the vehicle speed.
Drawings
Fig. 1 is a schematic view of the arrangement state of a piezoelectric induction band on a road, wherein 1 is the piezoelectric induction band, the material is piezoelectric ceramics, and 2 is the road.
Fig. 2 is a schematic diagram of a curve speed estimation indicator according to an embodiment of the present invention, in practical application, arranged at a curve, where C is an obstacle affecting the line of sight, a and B respectively represent the driving direction of a vehicle on a lane a and a lane B, and 3A and 3B are two display screens in a display module, where the display screen 3A is facing the lane a, that is: the display surface faces to the running vehicle of the lane A for the driver of the vehicle running on the lane A and entering the curve to watch; the display 3B is oriented towards lane B, i.e.: the display surface faces the traveling vehicle of the lane B for the driver of the vehicle traveling on the lane B into the curve to view.
Fig. 3 is a schematic diagram of a driving track of a vehicle passing through a curve.
Fig. 4 is a force analysis schematic diagram for a vehicle in a critical state of side sliding during driving.
FIG. 5 is a schematic diagram of signal transmission between modules of the curve speed estimation indicator based on piezoelectric sensing technology according to the present invention.
Detailed description of the preferred embodiments
In a first specific embodiment, the curve speed measurement and calculation indicator based on the piezoelectric sensing technology in this embodiment includes two piezoelectric sensing bands, a calculation module, and a display module, where:
the piezoelectric induction belt is used for inducing vehicle induction information of a running vehicle on a road and sending the vehicle induction information to the calculation module;
the calculation module is used for calculating and obtaining vehicle information of a corresponding vehicle according to the vehicle induction information sent by each piezoelectric induction zone, further calculating and obtaining the maximum safe speed of the lane where each piezoelectric induction zone is located, and sending the maximum safe speed to the display module;
and the display module is provided with two display screens which are respectively used for displaying the maximum safe speed corresponding to the two piezoelectric induction belts. Preferably, the display screen is an LED display screen or an LCD display screen.
The arrangement of the curve speed estimation indicator according to the invention at a curve is shown in fig. 2: the method comprises the steps that two piezoelectric induction belts 1 are respectively embedded under the road surface of an entrance of a curve where two traffic lanes 2 running oppositely enter, and the width of each piezoelectric induction belt 1 is matched with the width of the corresponding traffic lane 2. The display module is fixed on the roadside on the outer radius side of the curve turn, namely: the position of the existing wide-angle lens, and then two display screens (3A, 3B) of the display module face to the vehicle running direction of two lanes respectively. The calculation module can be fixed together with the display module and fixed on the roadside through the supporting body, and the two piezoelectric induction belts are connected with the calculation module and the display module through cables.
In practical application, when a vehicle on any lane is about to enter a curve when the vehicle is running, the piezoelectric induction belt on the lane sends detected information to the calculation module, the calculation module calculates the maximum safe speed of the vehicle according to the information, and the display screen facing the lane in the display module displays the maximum safe speed to prompt a driver of the vehicle to control the vehicle speed to enter and pass through the curve.
The vehicle information obtained by the calculation module includes: vehicle mass, speed.
Further, the structure of the piezoelectric induction band is shown in fig. 1. The piezoelectric induction area comprises many piezoelectric induction ceramic strips that are parallel to each other, and this piezoelectric induction area sets up under the road surface, and its theory of operation utilizes the principle of direct piezoelectric effect: when a vehicle runs and presses the piezoelectric induction belt, the piezoelectric induction ceramic strip generates a polarization phenomenon inside the piezoelectric induction ceramic strip under the action of gravity of the vehicle, charges with opposite signs are generated on two surfaces of the piezoelectric induction ceramic strip, the electric charge quantity generated by stress is in direct proportion to the size of an external force, and according to the principle, the calculation module can calculate and obtain information of the corresponding vehicle according to the information fed back by the piezoelectric induction belt, namely: the mass of the vehicle, and the travel speed. And further realize the detection of the mass and the speed of the passing vehicle.
The width of the piezoelectric induction belt is close to the width of a lane where the piezoelectric induction belt is located, and is generally 0.8 to 1 time of the width of a road.
The principle that the calculation module calculates and obtains the maximum safe speed of the oncoming vehicle according to the induction information sent by each piezoelectric induction band is as follows: according to the turning radius R of the curve where the piezoelectric induction belt is located and the static friction coefficient of the ground at the position where the piezoelectric induction belt is located, the driving state relative to the vehicle can be calculated and obtained by combining the vehicle mass and speed information detected by the piezoelectric induction belt, and the maximum speed of the coming vehicle in the opposite lane, which can safely drive without accidents, is that: maximum safe speed.
The specific calculation method comprises the following steps: assuming that the vehicle is running at a constant speed when passing through a curve, the speed is v, the total mass of the vehicle is m, the friction factor between the tires of the vehicle and the ground is u, the turning radius of the vehicle (adopting the turning radius of the curve) is R, and the acceleration a applied when the vehicle turns is a, the vehicle turns, and the state of the vehicle is shown in fig. 3.
Considering the critical state when the vehicle is sliding sideways, the force information of the vehicle at this time is analyzed, as shown in figure 4,
wherein, G is the inertial force that the vehicle receives, and its direction is opposite with the direction of the acceleration that the vehicle receives, and its size should be:
G＝ma， (1)
obtained by the darnberg principle:
ΣFX0, i.e. FA+FB-G＝0 (2)
ΣFY0, i.e. NA+NB-mg＝0 (3)
FA＝uNA(4)
FB＝uNB(5)
And a ═ v2/R (6)
Substituting expressions (1), (4), (5) and (6) into expressions (2) and (3) can obtain expression (7):
v＝uRg (7)
namely: when the vehicle speed, turning radius and friction factor satisfy the above formula, the vehicle is in a critical state of side slip.
In practical application, the distance between each piezoelectric induction band and a curve should be reasonably set according to factors such as road surface conditions and curve radius of roads, and the distance is generally set between 15 meters and 20 meters away from the curve, so that the effect of timely prompting a driver to adjust the vehicle speed and reserving adjustment time for the driver is achieved.
In a second embodiment, the present embodiment is an improvement of the curve speed estimation indicator based on the piezoelectric sensing technology in the first embodiment, in the present embodiment, the piezoelectric sensing strips are further configured to send vehicle entrance information to the display module when a vehicle is sensed to enter, and the display module is further configured to control a display screen corresponding to one of the piezoelectric sensing strips to display information that a vehicle enters the opposite lane on the display screen corresponding to the other piezoelectric sensing strip when the vehicle entrance information sent by the other piezoelectric sensing strip is received.
The information that the vehicle enters the opposite lane can be any prompting mode, such as: the prompt can be realized by adopting a Chinese or Chinese and English character mode.
In the embodiment, the display module is added with a new function, namely, the display module prompts whether a vehicle enters an opposite lane or not while prompting the maximum safe speed of the vehicle entering the curve, so that a driver can pay attention to the coming vehicle in the opposite lane while controlling the speed of the vehicle, and the safety factor is increased.
The above-described functions are further explained with reference to fig. 2: the road condition is shown in fig. 2, two lanes at the curve are a lane a and a lane B, the two lanes are two lanes running in opposite directions, the piezoelectric sensing strip located on the lane a corresponds to the display screen 3A in the display module, the display screen 3A faces the vehicle entering the lane a, the piezoelectric sensing strip located on the lane B corresponds to the display screen 3B in the display module, and the display screen 3B faces the vehicle entering the lane B.
When the piezoelectric induction belt 1 at the entrance of the curve of the lane A detects the information that a vehicle enters, the vehicle information is sent to the calculation module, the information that the vehicle enters is also sent to the display module, after the display module receives the information, the display module controls the display screen 3B to display that the vehicle enters the opposite lane, and then a vehicle driver who is located on the lane B and is about to enter the curve is prompted, the display module can also display the maximum safe speed information sent by the calculation module through the display screen 3A, and the vehicle driver who enters the curve on the lane A is prompted to control the vehicle speed.
Similarly, when the piezoelectric induction belt 1 at the entrance of the curve of the lane B detects the information that the vehicle enters, the vehicle information is sent to the calculation module, the information that the vehicle enters is also sent to the display module, after the display module receives the information, the display module controls the display screen 3A to display that the vehicle enters the opposite lane, and further prompts a driver of the vehicle who is located on the lane a and is about to enter the curve, the display module can also display the maximum safe speed information sent by the calculation module through the display screen 3B, and prompts the driver of the vehicle who enters the curve on the lane B to control the speed of the vehicle.
Claims (7)
1. Bend speed is calculated indicator based on piezoelectricity induction technique, its characterized in that, this indicator includes two piezoelectricity induction zone, calculation module and display module, wherein:
the piezoelectric induction belt is used for inducing vehicle induction information of a running vehicle on a road and sending the vehicle induction information to the calculation module;
the calculation module is used for calculating and obtaining vehicle information of a corresponding vehicle according to the vehicle induction information sent by each piezoelectric induction zone, further calculating and obtaining the maximum safe speed of the lane where each piezoelectric induction zone is located, and sending the maximum safe speed to the display module;
and the display module is provided with two display screens which are respectively used for displaying the maximum safe speed corresponding to the two piezoelectric induction belts.
2. The curve speed estimation indicator according to claim 1, wherein the vehicle information obtained by the calculation module includes: vehicle mass m and velocity v.
3. The curve speed estimation indicator according to claim 1, characterized in that the maximum safe speed obtained by the calculation module is calculated by the formula v-uRg according to the mass m of the vehicle, the friction factor u of the curve road corresponding to the piezoelectric induction band, and the turning radius R of the curve.
4. The curve speed estimation indicator according to claim 1, wherein the width of the piezo-electric induction strip is close to the width of the roadway, typically 0.8 to 1 times the width of the roadway.
5. The curve speed estimation indicator according to claim 1, wherein the piezo-electric sensor strip is comprised of a plurality of piezo-electric sensor ceramic strips parallel to each other.
6. The curve speed estimation indicator according to claim 1, wherein the display screen is an LED display screen or an LCD display screen.
7. The curve speed estimation indicator according to any one of claims 1 to 6, wherein the piezoelectric sensor strips are further configured to transmit vehicle entrance information to the display module when a vehicle is sensed to enter, and the display module is further configured to control a display screen corresponding to one of the piezoelectric sensor strips to display information that the vehicle enters the opposite lane when the vehicle entrance information transmitted by the other piezoelectric sensor strip is received.
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