CN106494398A - Prompting method for preventing vehicle rear-end collision based on mobile terminal and mobile terminal - Google Patents
Prompting method for preventing vehicle rear-end collision based on mobile terminal and mobile terminal Download PDFInfo
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- CN106494398A CN106494398A CN201610903061.8A CN201610903061A CN106494398A CN 106494398 A CN106494398 A CN 106494398A CN 201610903061 A CN201610903061 A CN 201610903061A CN 106494398 A CN106494398 A CN 106494398A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 15
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 3
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
- B60W30/095—Predicting travel path or likelihood of collision
- B60W30/0953—Predicting travel path or likelihood of collision the prediction being responsive to vehicle dynamic parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
- B60W30/095—Predicting travel path or likelihood of collision
- B60W30/0956—Predicting travel path or likelihood of collision the prediction being responsive to traffic or environmental parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/02—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to ambient conditions
- B60W40/04—Traffic conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/105—Speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W2050/143—Alarm means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W2050/146—Display means
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses a prompting method for preventing vehicle rear-end collision based on a mobile terminal and the mobile terminal, wherein the prompting method for preventing vehicle rear-end collision based on the mobile terminal comprises the following steps: the mobile terminal starts a detection program; detecting the speed and the distance between two vehicles to obtain the data of the speed and/or the distance between two vehicles; processing the acquired data of the vehicle speed and the distance between two vehicles, and judging whether a processing result meets an alarm condition; and when the alarm condition is met, sending out a prompt alarm. The invention utilizes the mobile terminal to measure the real-time speed of the vehicle and the distance between the vehicle and the front vehicle, processes the data, and sends out a prompt alarm to remind a driver of careful driving when the mobile terminal judges that the two vehicles have the risk of rear-end collision. The method is based on the mobile terminal device to detect the vehicle state, and does not need to install corresponding devices on the vehicle, thereby reducing the cost. And the mobile terminal is convenient to carry, has no special requirements on vehicles, is suitable for various vehicles, and has wide application range.
Description
Technical field
The present invention relates to vehicle driving safety technical field, particularly a kind of vehicle rear-end collision that prevents based on mobile terminal
Reminding method and mobile terminal.
Background technology
With the development of society, automobile has brought increasing facility, and gradually written people's life must not yet
The trip instrument that can lack.But with being continuously increased for vehicle, traffic accident is also more and more, wherein vehicle rear-end collision accident is one
Kind relatively common and multiple traffic accident, particularly high vehicle speeds whether generation rear-end collision is often to driving
The life security of personnel and passenger causes fatal harm.
In order to reduce the generation of vehicle rear-end collision accident to greatest extent, autobrake system on some vehicles, is configured with, main
If onboard assembling test the speed and range unit, be respectively used for measuring speed and and leading vehicle distance, then by controller process survey
Amount data, judge whether spacing is safe, and when spacing is less than braking distance, control system actively can be intervened, control vehicle
Brake system is braked.Thus largely can avoid slow drawing due to the error in judgement or reflect of human pilot
The rear-end collision for rising.
But, this kind of autobrake system often only can be configured in the middle of high-equipped vehicle model at present, relatively costly, and, on
The system of stating can only be with a car, and the scope of application is smaller.
Content of the invention
In view of this, the present invention provides a kind of reminding method for preventing vehicle rear-end collision based on mobile terminal and movement is whole
End.
According to the first aspect of the invention, there is provided a kind of reminding method for preventing vehicle rear-end collision based on mobile terminal, wrap
Include following steps：
Mobile terminal starts detection program；
Speed and two following distances are carried out detecting the data for obtaining speed and two following distances；
The speed of acquisition and/or the data of two following distances are processed, and
Judge whether result meets alert consitions；
When alert consitions are met, indicating alarm is sent.
Preferably, the speed of acquisition and the data of two following distances are carried out processing including being calculated according to the speed for measuring
Braking distance.
Preferably, the alert consitions include the braking distance more than two following distances for measuring.
Preferably, the alert consitions also include that two following distances that a rear time point is measured are measured less than previous time point
Two following distances.
Preferably, the interval time of former and later two time points is 1-5s.
Preferably, the alert consitions include two following distances less than safe distance between vehicles, meanwhile, two cars are with respect to vehicle speed value VPhaseIt is negative
Number, and relative vehicle speed value VPhaseAbsolute value be more than preset value VIn advance, wherein described safe distance between vehicles adds safe remaining for the braking distance
Amount；Wherein, VPhaseFor front truck relative to this car speed.
Preferably, the safe clearance is 0.2* (V+VIn advance), wherein V is the speed for obtaining, and unit is m/s, 0.2 unit
For the second, and/or, the preset value VIn advanceFor 0.5m/s.
Preferably, the relative vehicle speed value VPhaseComputing formula be, VPhase=(S2-S1)/t, wherein, S1For first time point
Two following distances for measuring, S2For two following distances that the second time point is measured, during the interval that t is first time point with the second time point
Between.
Preferably, the value of t is 1-5s.
Preferably, the computing formula of the braking distance is, SStop=V*V/ (2g μ), wherein, SStopFor braking distance；V is survey
The real-time speed for obtaining；G is acceleration of gravity, and μ is coefficient of friction.
Preferably, the value of the coefficientoffrictionμ is set as 0.7.
Preferably, the value of the coefficientoffrictionμ is voluntarily chosen according to weather condition by detecting program.
Preferably, the indicating alarm includes at least one in auditory tone cues, light prompt or text prompt.
According to the second aspect of the invention, there is provided a kind of mobile terminal, including
Measurement module, for measuring vehicle speed and two following distances；
Computing module, for processing the data that the measurement module is measured；
Judge module, for judging whether the result of the computing module processing data meets alert if；
Reminding module, for sending indicating alarm when the judge module judged result is for meeting the alert if.
Preferably, the measurement module detects speed by GPS speed measuring devices；And/or, the measurement module passes through laser
Range unit detects spacing.
Preferably, also include weather module, for obtaining real-time weather information and reaching the computing module, the calculating
Module is used for the value for determining coefficientoffrictionμ according to the Weather information for receiving.
Preferably, the mobile terminal is mobile phone or mobile internet device.
The reminding method and mobile terminal that prevent vehicle rear-end collision based on mobile terminal that the present invention is provided, using mobile whole
End is measured to the real-time speed of vehicle and with front truck spacing, and data measured is processed, when mobile terminal judges two
When car has the risk for knocking into the back, indicating alarm is sent, remind driver's careful driving.The method is based on mobile terminal device pair
Vehicle-state carries out detection and need not install corresponding hardware device on vehicle additional, reduces cost.And mobile terminal is conveniently taken
Band, and there is no particular/special requirement to vehicle, it is adaptable in various vehicles, applied range.
Description of the drawings
By description referring to the drawings to the embodiment of the present invention, above-mentioned and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 show the reminding method schematic flow sheet that prevent vehicle rear-end collision of the present invention based on mobile terminal；
Fig. 2 show the processing procedure schematic diagram of step S3；
Fig. 3 show another embodiment processing procedure schematic diagram of step S3；
Fig. 4 show the first embodiment structured flowchart of mobile terminal of the present invention；
Fig. 5 show the second embodiment structured flowchart of mobile terminal of the present invention.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
In detailed description of the text to the present invention, detailed some specific detail sections are described.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, known method, mistake
Journey, flow process, element are not described in detail.
Additionally, it should be understood by one skilled in the art that accompanying drawing is provided to descriptive purpose provided herein, and
Accompanying drawing is not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise entire disclosure and " including " in claims, "comprising" etc. are similar
Word should be construed to the implication for including rather than exclusive or exhaustive implication；That is, be " including but not limited to " contains
Justice.
In describing the invention, it is to be understood that term " first ", " second " etc. are not only used for describing purpose, and not
It is understood that as instruction or hint relative importance.Additionally, in describing the invention, unless otherwise stated, the implication of " multiple "
It is two or more.
As shown in figure 1, the present invention provide based on the reminding method for preventing vehicle rear-end collision of mobile terminal mainly include as
Lower step：
Step S1：Mobile terminal starts detection program.
Step S2：Speed and two following distances are carried out detecting the data for obtaining speed and two following distances.Mobile terminal continues
The real-time speed of detection vehicle and and leading vehicle distance.
Step S3：The speed of acquisition and the data of two following distances are processed, and judges whether to meet alert consitions, i.e.,
Under current vehicle speed and spacing, whether this car is in a safe condition.
In one embodiment, alert consitions include braking distance less than two following distances for measuring, and the rear time
Less than two following distances that previous time point is measured, i.e., under current vehicle speed, two following distances are too small and two cars for two following distances that measure of point
When being in the state being increasingly closer to, then judge that this car is in the hole, need to send indicating alarm.The step is specifically included
Process step as shown in Figure 2：
Step S31：Vehicle real-time speed according to measuring calculates braking distance, then by braking distance and the car for measuring
Away from being contrasted.
Preferably, braking distance computing formula is：SStop=V*V/ (2g μ), wherein SStopIt is braking distance i.e. in current vehicle speed
Under safe distance between vehicles；V is the real-time speed for measuring；G is acceleration of gravity, and the value of g is 9.8m/s herein；μ is coefficient of friction,
The coefficient of friction is relevant with weather condition, such as sleety weather ground wet and slippery from fine day when the ground friction coefficient that dries different,
Coefficientoffrictionμ value described herein is fine day and the median of rainy day surface friction coefficient, μ=0.7.Further, detect
Program can also obtain real-time weather, according to the value of weather condition sets itself μ, to reach more accurate result of calculation.
Step S32：Judge real-time spacing whether more than braking distance SStop.By the real-time spacing for measuring and stopping for calculating
Car distance is contrasted, and continues executing with step S31, if spacing is less than brake in real time if real-time spacing is more than braking distance
Apart from then execution step S33.
Step S33：Two car distances of two time points of contrast.
The real-time spacing of two different time points is obtained, then the spacing value of two time points is contrasted, it is preferred that
The interval time of two time points is 1-5s.
Step S34：Judge latter time point spacing whether less than previous time point spacing.
If latter time point spacing is more than previous time point spacing, then it represents that two following distances are being increased, and are not temporarily sent out
The risk that life is knocked into the back, is unsatisfactory for alert if, now executes S31.
If latter time point spacing is less than previous time point spacing, then it represents that two following distances are reducing, and exist and chase after
The risk of tail, meets alert if, now executes S4.
In another embodiment, alert consitions include braking distance less than two following distances for measuring, and two cars are with respect to car
Fast value VPhaseFor negative, wherein VPhaseIt is speed of the front truck relative to this car, i.e., is being more than when too small and this car the speed of two following distances
During the speed of front truck, then judge that this car is in the hole, need to send indicating alarm.Step S3 is may also include such as Fig. 3
Shown process step：
Step S31：Vehicle real-time speed according to measuring calculates braking distance, then by braking distance and the car for measuring
Away from being contrasted.
Preferably, braking distance computing formula is：SStop=V*V/ (2g μ), wherein SStopIt is braking distance i.e. in current vehicle speed
Under safe distance between vehicles；V is the real-time speed for measuring；G is acceleration of gravity, and the value of g is 9.8m/s herein；μ is coefficient of friction,
The coefficient of friction is relevant with weather condition, such as sleety weather ground wet and slippery from fine day when the ground friction coefficient that dries different,
Coefficientoffrictionμ value described herein is fine day and the median of rainy day surface friction coefficient, μ=0.7.Further, detect
Program can also obtain real-time weather, according to the value of weather condition sets itself μ, to reach more accurate result of calculation.
Step S32：Judge real-time spacing whether more than safe distance.The safe distance is braking distance+safe clearance,
The real-time spacing for measuring and the safe distance for calculating are contrasted, if real-time spacing is more than safe distance is continued to hold
Row step S31, execution step S33 if real-time spacing is less than braking distance '.Wherein, the safe clearance is 0.2* (V+
VIn advance), wherein V is the speed for obtaining, and unit is m/s, and 0.2 unit is the second, the VIn advanceFor preset vehicle speed value, value 0.5m/s.
In order to improve safety coefficient, this uses 0.2* (V+V when being in calculating safe clearanceIn advance), make the value of safe clearance bigger.
Step S33 '：Calculate relative vehicle speed value VPhase, wherein, VPhaseFor front truck relative to this car speed.
The real-time spacing measured according to two different time points calculating relative speed, i.e.,
VPhase=(S2-S1)/t, wherein, S1For two following distances that first time point is measured, S2Two measured for the second time point
Following distance, t are the interval time of first time point and the second time point, it is preferable that the span of t is 1-5s.
Step S34 '：Judge relative vehicle velocity VPhaseWhether value is negative.
If the relative vehicle velocity V of two carsPhase>0, the then two following distance S for measuring in the second time point2Survey more than first time point
The two following distance S for obtaining1, showing two following distances in increase, the risk temporarily not knocked into the back is unsatisfactory for alert if, now
Execute S31.
If the relative vehicle velocity V of two carsPhase<0, the then two following distance S for measuring in the second time point2Survey less than first time point
The two following distance S for obtaining1, show that two following distances are being continued to zoom out, have the risk for knocking into the back, execute S35.
Step S35：Judge relative vehicle velocity VPhaseWhether absolute value is more than preset vehicle speed value VIn advance.
If with respect to vehicle velocity VPhaseAbsolute value is less than preset vehicle speed value VIn advance, then show that two cars temporarily do not have the wind that knocks into the back
Danger, is unsatisfactory for alert if, now executes S31.
If with respect to vehicle velocity VPhaseAbsolute value is more than preset vehicle speed value VIn advance, show that two cars have the risk that knocks into the back, meet report
Alert condition, executes S4.
Wherein, preset vehicle speed value VIn advanceFor 0.5m/s.
S4：Send indicating alarm.Mobile terminal sends indicating alarm, reminds human pilot careful driving.
In this step, alarm can be various ways, such as be sent out by modes such as the sound of mobile terminal, light, words
Go out alarm.
The present invention also provides a kind of mobile terminal for the above-mentioned reminding method for preventing vehicle rear-end collision based on mobile terminal,
Fig. 4, Fig. 5 show the real-time example of two kinds of differences of the mobile terminal.
Fig. 4 show the first embodiment structured flowchart of mobile terminal of the present invention.
As shown in figure 4, the mobile terminal includes measurement module 100, computing module 200, judge module 300 and prompting mould
Block 400.The measurement module 100 is used for the real-time speed during measuring vehicle traveling and the distance between with front truck, and will
Data measured is transmitted to the computing module 200；The computing module 200 is used for the data measured by the measurement module 100
Processed, and result is transmitted to the judge module 300；The judge module 300 is carried out to data processed result
Judge whether to meet alert if, if meeting alert if, the judge module 300 sends finger to the reminding module 400
Order；The reminding module 400 sends indicating alarm after receiving the instruction of the judge module 300.
The measurement module 100 includes speed measuring module 101 and range finder module 102.The speed measuring module 101 is used for measuring car
Real-time speed, it is preferable that the speed measuring module be GPS speed measuring devices, vehicle is tested the speed by GPS；The range finding
Module 102 is used for the real-time range of measuring vehicle and front truck, it is preferable that the range finder module is laser sensor range unit,
Real-time spacing by two workshop of laser signal measurement.Measurement data is reached the computing module 200 by the measurement module 100
Data are processed.
The computing module 200 includes spacing computing module 201 and speed computing module 202.The spacing computing module
201 receive the data that the speed measuring module 101 is measured, and the value with reference to default coefficientoffrictionμ is calculated under real-time speed
Two car braking distances；Two workshops that the speed computing module 202 is measured in two time points according to the range finder module 102
Away from the relative velocity calculated between two cars.
The judge module 300 includes spacing judge module 301 and speed judge module 302.The spacing judge module
The two car real-time ranges that the braking distance that the spacing computing module 201 is calculated is measured with the range finder module 102 are carried out by 301
Contrast, when the real-time range is less than the braking distance, the speed judge module 302 judges the speed computing module
Whether the 202 relative speeds for calculating are less than 0, and when the relative speed is less than 0, the judge module 300 is to the reminding module
400 send instruction.
The reminding module 400 can arrange light modules, the tinkle of bells module, voice module, character module etc., by any
The mode of one or more combination sends cue.
Fig. 5 show the second embodiment structured flowchart of mobile terminal of the present invention.
As shown in figure 5, in the present embodiment, the mobile terminal also includes weather module 500, the weather module 500
Real-time weather information transfer to the computing module 200, the computing module 200 are selected corresponding μ values according to Weather information,
To obtain more accurate result of calculation.
The mobile terminal that the present invention is provided is preferably mobile phone.Or, the mobile terminal can also be that panel computer etc. is moved
Dynamic internet device.
The present invention utilizes mobile terminal to measure to the real-time speed of vehicle and with front truck spacing, and data measured is entered
Row is processed, and when mobile terminal judges that two cars have the risk for knocking into the back, is sent indicating alarm, is reminded driver's careful driving.
The method carries out detection based on mobile terminal device and need not install corresponding hardware device on vehicle additional to vehicle-state, reduces
Cost.And mobile terminal is convenient for carrying, and vehicle is not required, can be applied in various vehicles, applied range.
Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each preferred version can be free
Ground combination, superposition.
It should be appreciated that above-mentioned embodiment is only illustrative, and not restrictive, without departing from the basic of the present invention
In the case of principle, the modification of the various obvious or equivalent that those skilled in the art can be made for above-mentioned details is replaced
Change, be all included in scope of the presently claimed invention.
Claims (17)
1. a kind of reminding method for preventing vehicle rear-end collision based on mobile terminal, it is characterised in that comprise the steps：
Mobile terminal starts detection program；
Speed and two following distances are detected, the data of speed and two following distances are obtained；
The speed of acquisition and/or the data of two following distances are processed, and
Judge whether result meets alert consitions；
When alert consitions are met, indicating alarm is sent.
2. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 1, it is characterised in that to obtaining
The speed for obtaining and the data of two following distances carry out processing including calculating braking distance according to the speed for measuring.
3. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 2, it is characterised in that described
Alert consitions include the braking distance more than two following distances for measuring.
4. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 3, it is characterised in that described
Alert consitions also include after two following distances that measure of time point less than two following distances that previous time point is measured.
5. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 4, it is characterised in that in front and back
The interval time of two time points is 1-5s.
6. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 2, it is characterised in that described
Alert consitions include two following distances less than safe distance between vehicles, meanwhile, two cars are with respect to vehicle speed value VPhaseFor negative, and relative vehicle speed value VPhase's
Absolute value is more than preset value VIn advance, wherein described safe distance between vehicles adds safe clearance for the braking distance；Wherein, VPhaseRelative for front truck
Speed in this car.
7. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 6, it is characterised in that described
Safe clearance is 0.2* (V+VIn advance), wherein V is the speed for obtaining, and unit is m/s, and 0.2 unit is the second, and/or, described default
Value VIn advanceFor 0.5m/s.
8. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 6, it is characterised in that described
With respect to vehicle speed value VPhaseComputing formula be, VPhase=(S2-S1)/t, wherein, S1For two following distances that first time point is measured, S2For
Two following distances that second time point is measured, t are the interval time of first time point and the second time point.
9. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 8, it is characterised in that t's
Value is 1-5s.
10. the reminding method for preventing vehicle rear-end collision based on mobile terminal according to claim 2, it is characterised in that institute
The computing formula for stating braking distance is, SStop=V*V/ (2g μ), wherein, SStopFor braking distance；V is the real-time speed for measuring；G is
Acceleration of gravity, μ are coefficient of friction.
11. reminding methods for preventing vehicle rear-end collision based on mobile terminal according to claim 10, it is characterised in that institute
The value for stating coefficientoffrictionμ is set as 0.7.
12. reminding methods for preventing vehicle rear-end collision based on mobile terminal according to claim 10, it is characterised in that institute
The value for stating coefficientoffrictionμ is set as different values according to weather condition.
13. reminding methods for preventing vehicle rear-end collision based on mobile terminal according to any one of claim 1 to 12, its
It is characterised by, the indicating alarm includes at least one in auditory tone cues, light prompt or text prompt.
14. a kind of mobile terminals, it is characterised in that include
Measurement module, for measuring vehicle speed and two following distances；
Computing module, for processing the data that the measurement module is measured；
Judge module, for judging whether the result of the computing module processing data meets alert if；
Reminding module, for sending indicating alarm when the judge module judged result is for meeting the alert if.
15. mobile terminals according to claim 14, it is characterised in that the measurement module is examined by GPS speed measuring devices
Measuring car speed；And/or, the measurement module detects spacing by laser ranging system.
16. mobile terminals according to claim 14, it is characterised in that also include weather module, for obtaining real-time day
Gas information simultaneously reaches the computing module, and the computing module is used for determining taking for coefficientoffrictionμ according to the Weather information for receiving
Value.
17. mobile terminals according to any one of claim 14 to 16, it is characterised in that the mobile terminal is mobile phone
Or mobile internet device.
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