CN114708725A - Temperature early warning system and early warning method for vehicle brake on long and large downhill road section - Google Patents
Temperature early warning system and early warning method for vehicle brake on long and large downhill road section Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the field of road traffic, in particular to a temperature early warning system and method for a vehicle brake on a long and large downhill road section. The invention carries out multi-point combined monitoring on the temperature of the vehicle brake, can issue more accurate brake temperature early warning information to a vehicle driver, and enables the vehicle driver to know the braking state of the vehicle in time, thereby adopting corresponding measures to cool the brake and avoiding rear-end collision, collision or rollover accidents caused by brake failure.
Description
Technical Field
The invention relates to the field of road traffic, in particular to a long and large downhill road vehicle brake temperature early warning system and an early warning method.
Background
With the rapid development of road transportation in China, the driving amount of trucks on roads is increased year by year, and great convenience is provided for daily life of people. In the long-time running and braking process of the vehicle, particularly in a continuously long and large downhill road section, a brake pedal needs to be stepped for a long time to control the speed of the vehicle. The long-time braking of the brake causes the temperature of the brake to rise, the brake recession phenomenon may occur, and the braking capability of individual vehicles can be completely lost in serious conditions, so that a great accident occurs.
For the truck with over-high temperature brake in the running process, the highway traffic department adopts corresponding safety facilities mainly including traffic sign lines, danger avoiding lanes and the like. The vehicle is reminded to slow down or stop running to reduce the temperature of the brake, so that the accident rate is reduced.
Under the common conditions, a driver mostly depends on driving experience for judging the over-temperature of the truck brake, and the set traffic facilities only play a role in prompting, so that the specific working state of the truck brake cannot be determined and corresponding measures for the over-temperature of the brake cannot be taken timely.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a vehicle brake temperature early warning system and an early warning method for a long and large downhill road section, which can carry out multi-point combined monitoring on the temperature of a vehicle brake and can more accurately provide early warning information aiming at the vehicle brake for a driver.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The technical scheme 1:
a temperature early warning system for vehicle brakes on long and large downhill sections comprises a plurality of roadside vehicle brake temperature detection subsystems and a remote control center;
the system comprises a road side vehicle brake temperature detection subsystem, a vehicle speed detection system and a vehicle speed detection system, wherein the road side vehicle brake temperature detection subsystem comprises a speed measurement radar, a license plate recognition device, a temperature acquisition sensor, an information release device and an industrial personal computer;
the industrial personal computer is respectively connected with the temperature acquisition sensor, the license plate recognition equipment, the speed measuring radar and the information issuing equipment;
the speed measuring radar is used for measuring the speed of the vehicle; the license plate recognition equipment is used for collecting the license plate information and the vehicle type information of the vehicle; the temperature acquisition sensor is used for acquiring the temperature of the vehicle hub area; the information issuing equipment is used for issuing vehicle brake overtemperature early warning information;
the industrial personal computer is used for predicting the temperature of the vehicle brake according to the temperature of the vehicle hub area acquired by the temperature acquisition sensor and sending the predicted temperature of the vehicle brake and the vehicle information acquired by the license plate recognition equipment and the speed measuring radar to the remote control center through a network; the industrial personal computer is also used for receiving an early warning mode signal of the remote control center and issuing the overtemperature early warning information of the vehicle brake through the information issuing equipment according to the early warning mode signal;
and the remote control center obtains an early warning mode signal according to the early warning method and sends the early warning mode signal to the industrial personal computer.
The technical scheme 2 is as follows:
an early warning method of a long downhill section vehicle brake temperature early warning system comprises the following steps:
and 3, sending the adjusted early warning mode signal to an industrial personal computer in the ith roadside vehicle brake temperature detection subsystem.
Compared with the prior art, the invention has the beneficial effects that: the vehicle brake temperature is monitored in a multi-point combined mode, more accurate brake temperature early warning information can be issued to a vehicle driver, the vehicle driver can know the braking state of the vehicle in time, corresponding measures are taken to cool the brake, and rear-end collision, collision or rollover accidents caused by brake failure are avoided.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic diagram of a vehicle brake temperature warning system;
FIG. 2 is a schematic structural diagram of a roadside vehicle brake temperature detection subsystem;
FIG. 3 is a schematic layout view of a roadside vehicle brake temperature detection subsystem of embodiment 1;
FIG. 4 is a schematic view of the layout spacing distance of the roadside vehicle brake temperature detection subsystem of embodiment 1;
description of reference numerals: the system comprises a temperature measurement prompting signboard 1, a license plate recognition device 2, a speed measurement radar 3, a temperature acquisition sensor 4, an information issuing device 5 and an industrial personal computer 6.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
Referring to fig. 1, a temperature early warning system for a vehicle brake on a long and large downhill section comprises a plurality of roadside vehicle brake temperature detection subsystems and a remote control center;
referring to fig. 2, the temperature detection subsystem of the roadside vehicle brake includes a speed measuring radar, a license plate recognition device, a temperature acquisition sensor, an information issuing device and an industrial personal computer;
the industrial personal computer is respectively connected with the temperature acquisition sensor, the license plate recognition equipment, the speed measuring radar and the information issuing equipment;
the speed measuring radar is used for measuring the speed of the vehicle; the license plate recognition equipment is used for collecting the license plate information and the vehicle type information of the vehicle; the temperature acquisition sensor is used for acquiring the temperature of the vehicle hub area; the information issuing equipment is used for issuing the overtemperature early warning information of the vehicle brake;
the industrial personal computer is used for obtaining the temperature of a vehicle brake according to the temperature of the vehicle hub area collected by the temperature collecting sensor, and sending the obtained temperature of the vehicle brake and vehicle information collected by the license plate recognition device and the speed measuring radar to the remote control center through a network; the industrial personal computer is also used for receiving an early warning mode signal of the remote control center and issuing the overtemperature early warning information of the vehicle brake through the information issuing equipment according to the early warning mode signal;
and the remote control center obtains an early warning mode signal according to the early warning method and sends the early warning mode signal to the industrial personal computer.
Referring to fig. 3, a schematic diagram of a road test layout of the road side vehicle brake temperature detection subsystem of the present embodiment is shown; the temperature detection subsystem of the roadside vehicle brake further comprises a temperature measurement prompt signboard 1;
the temperature detection subsystem of the road side vehicle brake is arranged on a road shoulder;
the temperature measurement prompting signboard 1 is arranged at the upstream of the road;
the license plate recognition device 2, the speed measuring radar 3 and the temperature acquisition sensor 4 are arranged on the same post; the installation height of the license plate recognition device 2 and the speed measuring radar 3 on the sighting rod is 2m, and the direction is 60 degrees inclined towards the ground; the temperature acquisition sensor 4 is arranged on the mark post at a position 55cm away from the ground and is consistent with the height of the vehicle wheels;
the industrial personal computer 6 is respectively and electrically connected with the license plate recognition equipment 2, the speed measuring radar 3, the temperature acquisition sensor 4 and the information issuing equipment 5, and the industrial personal computer 6 is arranged near a benchmark of the license plate recognition equipment 2;
the recognition time of the license plate recognition device 2 is less than 40 ms; the response time of the temperature acquisition sensor 4 is 25ms, the processing time of the industrial personal computer 6 and the remote control center is not less than 2s, and in order to ensure that the vehicle runs to the information issuing equipment 5 and receives early warning information, the information issuing equipment 5 is at least 100m away from the license plate recognition equipment 2, the speed measuring radar 3 and the temperature acquisition sensor 4.
Referring to fig. 4, the temperature detection subsystem of the road side vehicle brake should be uniformly arranged on a long and large downhill section; particularly, in a long and large downhill road section, a plurality of continuous curves or special road sections such as mountain roads and the like, the arrangement density of the road side vehicle brake temperature detection subsystem should be increased.
The working process of the vehicle brake temperature early warning system on the long and large downhill section comprises the following steps: the temperature measurement prompting sign board 1 prompts the driver to measure the temperature in front, so that the driver can notice whether the brake of the vehicle is over-temperature or not. When a vehicle passes through the marker post, the license plate recognition device 2 captures a vehicle image, the speed measuring radar 403 collects vehicle speed information, and the temperature collecting sensor 4 collects the temperature of a vehicle hub area; the industrial personal computer 6 obtains the brake temperature of the vehicle according to the corresponding relation between the vehicle hub region temperature and the vehicle brake temperature and the vehicle hub region temperature acquired by the temperature acquisition sensor 4; the industrial personal computer 6 sends the obtained brake temperature of the vehicle and the vehicle information (license plate and vehicle speed) of the vehicle to a remote control center through a network; the remote control center obtains an early warning mode signal according to the early warning method and sends the early warning mode signal to the industrial personal computer 6; the industrial personal computer 6 issues corresponding vehicle brake overtemperature early warning information through the information issuing equipment according to the early warning mode signal, and the general early warning information is 'brake overtemperature', and the vehicle is requested to enter the danger avoiding lane. ", the text is yellow; the emergency warning information is marked as 'mark x' and (license plate number) brake overtemperature, and the vehicle immediately drives into the danger avoiding lane! ", the text is red.
Example 2
An early warning method of a long and steep downhill section vehicle brake temperature early warning system comprises the following steps:
specifically, the vehicle continuously passes through n roadside vehicle brake temperature detection subsystems, and when n is equal to 1, a first early warning strategy is selected; when n is 2, selecting a second early warning strategy; when n is larger than or equal to 3, selecting a third early warning strategy; wherein N is 1, 2.
The early warning mode signal comprises a three-level early warning mode signal from low to high: no pre-warning signal, general pre-warning mode signal and emergency pre-warning mode signal.
Definition of TiThe brake temperature T when the vehicle passes through the brake temperature detection subsystem of the ith roadside vehiclei-1The brake temperature T when the vehicle passes through the i-1 th roadside vehicle brake temperature detection subsystemi-2The brake temperature when the vehicle passes through the brake temperature detection subsystem of the i-2 roadside vehicle; definition of
A first threshold value of the i-th roadside vehicle brake temperature detection subsystem for the vehicle to pass,
i-th roadside vehicle system for vehicle passingA second threshold value of the actuator temperature detection subsystem, and
definition a1Is a brake temperature variation amplitude parameter threshold;
the first pre-warning policy is:
if it is
Selecting a non-early warning signal;
if it is
Selecting a general early warning mode signal;
if it is
The emergency alert mode signal is selected.
The second pre-warning policy is:
calculating a brake temperature variation amplitude parameter a between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem which the vehicle passes(i-1,i)：
In the formula, S(i-1,i)The distance between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem;
a(i-1,i)there are two cases of the value of (c): a is(i-1,i)> 0 or a(i-1,i)＜0；
When a is(i-1,i)At > 0:
if it is
And a is(i-1,i)＜a1If so, choose not to warn the letterNumber;
if it is
And a is a(i-1,i)≥a1Selecting a general early warning mode signal;
if it is
Selecting a general early warning mode signal;
if it is
And a is(i-1,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-1,i)≥a1Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
Selecting a non-early warning signal;
if it is
And | a(i-1,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-1,i)|≥a1If yes, selecting no early warning signal;
if it is
Selecting a general early warning mode signal;
if it is
And | a(i-1,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-1,i)|≥a1Then the general early warning mode signal is selected.
The third pre-warning policy is:
calculating a brake temperature variation amplitude parameter a between the i-2 roadside vehicle brake temperature detection subsystem and the i roadside vehicle brake temperature detection subsystem(i-2,i)：
In the formula, S(i-2,i)The distance between the i-2 roadside vehicle brake temperature detection subsystem and the i roadside vehicle brake temperature detection subsystem is obtained;
calculating a brake temperature variation amplitude parameter a between the i-1 th road-side vehicle brake temperature detection subsystem and the i-th road-side vehicle brake temperature detection subsystem(i-1,i)：
In the formula, S(i-1,i)The distance between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem;
calculating a brake temperature variation amplitude parameter a between the i-2 th road side vehicle brake temperature detection subsystem and the i-1 th road side vehicle brake temperature detection subsystem(i-2,i-1)：
In the formula, S(i-2,i-1)The distance between the i-2 th roadside vehicle brake temperature detection subsystem and the i-1 st roadside vehicle brake temperature detection subsystem is obtained;
a(i-2,i)、a(i-1,i)、a(i-2,i-1)there are six cases of the following values:
when a is(i-2,i)＞0、a(i-2,i-1)> 0 and a(i-1,i)At > 0:
if it is
And a is(i-2,i)＜a1If yes, selecting no early warning signal;
if it is
And a is(i-2,i)≥a1Selecting a general early warning mode signal;
if it is
And a is a(i-2,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＞0、a(i-2,i-1)< 0 and a(i-1,i)At > 0:
if it is
Selecting a non-early warning signal;
if it is
And a is(i-2,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＞0、a(i-2,i-1)> 0 and a(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
And a is(i-2,i)＜a1If yes, selecting no early warning signal;
if it is
And a is(i-2,i)＜a1Selecting an emergency early warning mode signal;
if it is
And a is a(i-2,i)≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)< 0 and a(i-1,i)When < 0:
if it is
And | a(i-2,i)|≥a1If yes, selecting no early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)> 0 and a(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-2,i)|≥a1If yes, selecting no early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)< 0 and a(i-1,i)At > 0:
if it is
Selecting not to warn;
if it is
And | a(i-2,i)|＜a1If so, selecting a non-early warning signal;
if it is
And | a(i-2,i)|≥a1Then select the general early warning mode messageA number;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
in particular, v is definediThe speed of the vehicle passing through the brake temperature detection subsystem of the ith roadside vehicle is obtained; definition of
The speed limit value of the road at the brake temperature detection subsystem of the ith roadside vehicle is obtained;
if the first early warning strategy is selected, the early warning mode signal is not adjusted;
if the second early warning strategy is selected, the first early warning strategy is selected
And a is(i-1,i)When the signal is more than 0, the early warning mode signal is increased by one level, and the early warning mode signal is not adjusted under other conditions;
if the third early warning strategy is selected, the first early warning strategy is selected
And a is(i-2,i)When the signal is more than 0, the early warning mode signal is increased by one level, and the early warning mode signal is not adjusted under other conditions;
and 3, sending the adjusted early warning mode signal to an industrial personal computer in the ith roadside vehicle brake temperature detection subsystem.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A temperature early warning system for a vehicle brake on a long and large downhill section is characterized by comprising a plurality of roadside vehicle brake temperature detection subsystems and a remote control center;
the system comprises a road side vehicle brake temperature detection subsystem, a vehicle speed detection system and a vehicle speed detection system, wherein the road side vehicle brake temperature detection subsystem comprises a speed measurement radar, a license plate recognition device, a temperature acquisition sensor, an information release device and an industrial personal computer;
the industrial personal computer is respectively connected with the temperature acquisition sensor, the license plate recognition equipment, the speed measurement radar and the information issuing equipment;
the speed measuring radar is used for measuring the speed of the vehicle; the license plate recognition equipment is used for collecting the license plate information and the vehicle type information of the vehicle; the temperature acquisition sensor is used for acquiring the temperature of the vehicle hub area; the information issuing equipment is used for issuing vehicle brake overtemperature early warning information;
the industrial personal computer is used for predicting the temperature of the vehicle brake according to the temperature of the vehicle hub area acquired by the temperature acquisition sensor and sending the predicted temperature of the vehicle brake and the vehicle information acquired by the license plate recognition equipment and the speed measuring radar to the remote control center through a network; the industrial personal computer is also used for receiving an early warning mode signal of the remote control center and issuing the overtemperature early warning information of the vehicle brake through the information issuing equipment according to the early warning mode signal;
and the remote control center obtains an early warning mode signal according to the early warning method and sends the early warning mode signal to the industrial personal computer.
2. The early warning method of the early warning system for the temperature of the vehicle brake on the long and large downhill section is characterized by comprising the following steps of:
step 1, selecting an early warning strategy according to the number of vehicles continuously passing through a roadside vehicle brake temperature detection subsystem to obtain an early warning mode signal sent to the roadside vehicle brake temperature detection subsystem;
step 2, adjusting the early warning mode signal obtained in the step 1 according to the selected early warning strategy and the vehicle speed;
and 3, sending the adjusted early warning mode signal to an industrial personal computer in the ith roadside vehicle brake temperature detection subsystem.
3. The early warning method of the long downhill road vehicle brake temperature early warning system according to claim 2, wherein in step 1, an early warning strategy is selected, specifically, a vehicle continuously passes through n roadside vehicle brake temperature detection subsystems, and when n is 1, a first early warning strategy is selected; when n is 2, selecting a second early warning strategy; when n is larger than or equal to 3, selecting a third early warning strategy; wherein N is 1, 2.
4. The early warning method of the long downhill section vehicle brake temperature early warning system according to claim 3, wherein the early warning mode signal comprises three levels from low to high: no pre-warning signal, general pre-warning mode signal and emergency pre-warning mode signal.
5. The warning method of the vehicle brake temperature warning system on a long downhill section according to claim 4, characterized in that the first warning policy is:
if it is
Selecting a non-early warning signal;
if it is
Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
the second pre-warning policy is:
calculating a brake temperature variation amplitude parameter a between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem which the vehicle passes(i-1,i)：
In the formula, S(i-1,i)The distance between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem;
when a is(i-1,i)At > 0:
if it is
And a is(i-1,i)＜a1If yes, selecting no early warning signal;
if it is
And a is(i-1,i)≥a1Selecting a general early warning mode signal;
if Ti-1＜Tsi≤TiSelecting a general early warning mode signal;
if it is
And a is(i-1,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-1,i)≥a1Then select the emergency alert modeA signal;
if it is
Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
Selecting a non-early warning signal;
if it is
And | a(i-1,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-1,i)|≥a1If yes, selecting no early warning signal;
if it is
Selecting a general early warning mode signal;
if it is
And | a(i-1,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-1,i)|≥a1Selecting a general early warning mode signal;
the third pre-warning policy is:
calculating a brake temperature variation amplitude parameter a between the i-2 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem(i-2,i)：
In the formula, S(i-2,i)The distance between the i-2 roadside vehicle brake temperature detection subsystem and the i roadside vehicle brake temperature detection subsystem is obtained;
calculating a brake temperature variation amplitude parameter a between the i-1 th road-side vehicle brake temperature detection subsystem and the i-th road-side vehicle brake temperature detection subsystem(i-1,i)：
In the formula, S(i-1,i)The distance between the i-1 th roadside vehicle brake temperature detection subsystem and the i-th roadside vehicle brake temperature detection subsystem;
calculating a brake temperature variation amplitude parameter a between the i-2 th road side vehicle brake temperature detection subsystem and the i-1 th road side vehicle brake temperature detection subsystem(i-2,i-1)：
In the formula, S(i-2,i-1)The distance between the i-2 th roadside vehicle brake temperature detection subsystem and the i-1 st roadside vehicle brake temperature detection subsystem is obtained;
when a is(i-2,i)＞0、a(i-2,i-1)> 0 and a(i-1,i)At > 0:
if it is
And a is(i-2,i)＜a1If yes, selecting no early warning signal;
if it is
And a is(i-2,i)≥a1Selecting a general early warning mode signal;
if it is
And a is(i-2,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＞0、a(i-2,i-1)< 0 and a(i-1,i)At > 0:
if it is
Selecting a non-early warning signal;
if it is
And a is a(i-2,i)＜a1Selecting a general early warning mode signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＞0、a(i-2,i-1)> 0 and a(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
And a is(i-2,i)≥a1Selecting an emergency early warning mode signal;
if it is
And a is(i-2,i)＜a1If yes, selecting no early warning signal;
if it is
And a is(i-2,i)＜a1Selecting an emergency early warning mode signal;
if it is
And a is(i-2,i)≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)< 0 and a(i-1,i)When < 0:
if it is
And | a(i-2,i)|≥a1If yes, selecting no early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)> 0 and a(i-1,i)When < 0:
if it is
Selecting a non-early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting a general early warning mode signal;
if it is
And | a(i-2,i)|≥a1If yes, selecting no early warning signal;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
when a is(i-2,i)＜0、a(i-2,i-1)< 0 and a(i-1,i)At > 0:
if it is
Selecting not to warn;
if it is
And | a(i-2,i)|＜a1If yes, selecting no early warning signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
if it is
And | a(i-2,i)|＜a1Selecting an emergency early warning mode signal;
if it is
And | a(i-2,i)|≥a1Selecting a general early warning mode signal;
if it is
Selecting an emergency early warning mode signal;
wherein, TiThe brake temperature T when the vehicle passes through the brake temperature detection subsystem of the ith roadside vehiclei-1The brake temperature T when the vehicle passes through the i-1 th roadside vehicle brake temperature detection subsystemi-2The brake temperature when the vehicle passes through the brake temperature detection subsystem of the i-2 roadside vehicle; t issiA first threshold value of the i-th roadside vehicle brake temperature detection subsystem for the vehicle to pass,
a second threshold value of the i-th roadside vehicle brake temperature detection subsystem for the vehicle to pass, an
a1Is a parameter threshold value of the temperature change amplitude of the brake.
6. The warning method of the vehicle brake temperature warning system on the long downhill section as claimed in claim 5, wherein in step 2, specifically, if the first warning strategy is selected, the warning mode signal is not adjusted; if the second early warning strategy is selected, the first early warning strategy is selected
And a is a(i-1,i)When the signal is more than 0, the early warning mode signal is increased by one level, and the early warning mode signal is not adjusted under other conditions; if the third early warning strategy is selected, the first early warning strategy is selected
And a is(i-2,i)When the signal is more than 0, the early warning mode signal is increased by one level, and the early warning mode signal is not adjusted under other conditions;
wherein, viThe speed of the vehicle passing through the brake temperature detection subsystem of the ith roadside vehicle is obtained; definition of
The speed limit value of the road at the brake temperature detection subsystem of the ith roadside vehicle is obtained.
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