CN102231239B - Vehicle-road interaction technology-based energy-saving driving strategy prompt system and working method thereof - Google Patents
Vehicle-road interaction technology-based energy-saving driving strategy prompt system and working method thereof Download PDFInfo
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Abstract
The invention discloses a vehicle-road interaction technology-based energy-saving driving strategy prompt system and a working method thereof. The system comprises a radio frequency transmitter which is arranged at an intersection and can acquire traffic information of the intersection, and an energy-saving driving strategy prompt device which is arranged on a vehicle, wherein the device consists of a software part and a hardware part; the hardware part consists of a microprocessor, a radio frequency receiver, a vehicle-mounted global position system (GPS) navigator and a display and/or a voice prompter; and the software part mainly refers to an energy-saving driving strategy operating module. When the vehicle enters a road section with a signal control intersection ahead, the energy-saving driving strategy prompt device matches real-time data of the vehicle-mounted GPS navigator with the received traffic information, processes the data and the information through the energy-saving driving strategy operating module to acquire a vehicle energy-saving driving strategy, and prompts the vehicle energy-saving driving strategy to a driver through the display and/or the voice prompter. By the system, the aims of energy-saving driving and exhaust emission reduction can be fulfilled.
Description
Technical field
The invention belongs to the intelligent transport technology field.
Background technology
The world today, a lot of international problems, social concern are all energy problem after all.Automobile has greatly improved people's living standard since invention, promoted the progress of human society.But also brought great negative effect, such as having consumed a large amount of energy, and caused serious traffic jam issue and environmental pollution etc.
At present, the research of vehicle energy saving is mainly to carry out from " increasing income " and " throttling " two aspects." increase income " and refer to seek various new forms of energy replacement petroleum-based energies; " throttling " mainly refers to improve the fuel economy of vehicle, as optimizing the car conour design, improving power system and kinematic train and adopt advanced electronic technology etc.But " increasing income " technology is not yet ripe, and comprehensive benefit is also indefinite, and the R﹠D costs of " throttling " technology are higher.
Vehicle in the process of moving, when especially travelling in the city, do not know to be about to arrive the traffic conditions of intersection, the place ahead due to the driver, may compare frequently vehicle in by the process of intersection, the place ahead and control, such as accelerating, slow down, stop, starting, such controlling can make vehicle produce larger energy dissipation and exhaust emissions.
Summary of the invention
The objective of the invention is to reduce from the mutual angle of bus or train route the problem of vehicle power consumption and exhaust emissions.Based on this, the invention provides a kind of energy-saving driving strategy prompt system based on vehicle-road interaction technology and method of work thereof, when vehicle passes through intersection, the place ahead, can make the prompting of driving strategy to human pilot in real time, so that the driver carries out vehicle performance according to prompting, and then reach purpose energy-conservation and the minimizing exhaust emissions.
For reaching above-mentioned purpose, the present invention's technical scheme of taking of dealing with problems is:
A kind of energy-saving driving strategy prompt system based on vehicle-road interaction technology comprises the two large divisions:
One is mounted in the radiofrequency launcher that can obtain this crossing traffic information at place, crossing, and this radiofrequency launcher obtains transport information from the signal controller at crossing, place, and by the less radio-frequency transmitter module overseas broadcast in radiofrequency launcher;
Two are mounted in the energy-saving driving strategy suggestion device on vehicle, and this device is comprised of software and hardware two parts, and hardware components is comprised of microprocessor, radio frequency receiver, vehicle-mounted GPS navigator and display and/or voice prompting device; Software section mainly refers to the energy-saving driving strategy computing module.Provide real time data by vehicle-mounted GPS navigator, by the Receiver Module receiving traffic information, microprocessor mates transport information and real time data, transferring to the energy-saving driving strategy computing module calculates, obtain automobile energy-saving and drive strategy, and automobile energy-saving driving strategy is prompted to human pilot by display and/or voice prompting device.
In described transport information, comprise phase item, phase place green time, green light interval time and the traffic signals cycle of crossing numbering, current phase item, current phase place green light excess time, other each phase places; Above-mentioned phase place refers to: in one-period, and a certain or several the right-of-ways that traffic flow obtains on level-crossing;
The real time data of described vehicle-mounted GPS navigator comprises: signal controlled junctions numbering, the position that vehicle front is about to reach arrived front signal and controlled the remaining mileage at crossing, vehicle travel direction and the highway section speed limit at crossing forwardly.
The present invention is based on the method for work of the energy-saving driving strategy prompt system of vehicle-road interaction technology: when vehicle enters the place ahead and is the highway section of signal controlled junctions, microprocessor reads vehicle-mounted GPS navigator information, and receive by Receiver Module the transport information that place, arrival crossing, the place ahead radiofrequency launcher broadcasts, transport information and real time data are mated, transferring to the energy-saving driving strategy computing module calculates, obtain automobile energy-saving and drive strategy, and automobile energy-saving driving strategy is prompted to human pilot by display and/or voice prompting device.
Automobile energy-saving is driven strategy and is included but not limited to that the vehicle maximum possible need not to wait for comparatively economic, the safe travel speed that can pass through junction ahead.
The detailed operation method of above-mentioned energy-saving driving strategy prompt system is:
The first step: beginning, system start;
Second step: system initialization;
The 3rd step: microprocessor begins to read vehicle-mounted GPS navigator information, and information comprises: signal controlled junctions numbering, the position that vehicle front is about to reach arrived front signal and controlled the remaining mileage at crossing, vehicle travel direction and the highway section speed limit at crossing forwardly;
The 4th step: the transport information that the microprocessor processes Receiver Module receives, and therefrom extracting the multiphase traffic time allocation information at this crossing, transport information comprises: phase item, phase place green time, green light interval time and the traffic signals cycle of crossing numbering, current phase item, current phase place green light excess time, other each phase places;
The 5th step: the microprocessor energy saving in running is driven tactful computing module;
The 6th step: automobile energy-saving is driven strategy be prompted to human pilot by display and/or voice prompting device;
The 7th step: returned to for the 3rd step, carry out computing next time.
The calculation step in above-mentioned the 5th step is as follows:
The first step: set each phase place and the phase place duration at this crossing, be called successively the first phase place, first phase place green light excess time; The second phase place, the second phase place green time; Third phase position, third phase position green time; The 4th phase place, the 4th phase place green time ... the rest may be inferred.Wherein, the first phase place is current phase place, and the first phase place green light is the green light excess time after current time begins excess time; The phase item of the first phase place is that be t the excess time of p1, the first phase place
r, the second phase place the phase item be that the duration of p2, the second phase place is t
p2, the third phase position the phase item be that the duration of p3, third phase position is t
p3, the 4th phase place the phase item be that the duration of p4, the 4th phase place is t
p4, by that analogy.
Described current phase place refers to the current phase place that is in the clearance state in this crossing.
Setting phase place green light interval time is T
i, the traffic signals cycle is T, the remaining mileage that the crossing is controlled to front signal in the position is D; According to vehicle forwardly the travel direction at crossing to obtain vehicle pass-through phase item with phase matching be n; The highway section Maximum speed limit is V
Limit, the minimum speed of Vehicle Driving Cycle is V
m
Second step calculates the nearest time interval [t1, t2] that the vehicle desired phase is let pass;
If 1 n=p1, t1=0, t2=t
r, turned for the 3rd step, otherwise continue;
If 2 n=p2, t1=t
r+ T
i, t2=t1+t
p2, turned for the 3rd step, otherwise continue;
If 3 n=p3, t1=t
r+ T
i+ t
p2+ T
i, t2=t1+t
p3, turned for the 3rd step, otherwise continue;
If 4 n=p4, t1=t
r+ T
i+ t
p2+ T
i+ t
p3+ T
i, t2=t1+t
p4, turned for the 3rd step, otherwise continue;
By that analogy.
The 3rd step, calculate vehicle nothing in n traffic signals Cycle Length and wait for by the required speed that reaches in this crossing, use respectively V
1, V
2..., V
nExpression,
Wherein, V
1If=(D/t1+D/t2)/2 are t1=0, V
1=1.2D/t2; V
2=(D/ (t1+T)+D/ (t2+T))/2; Calculate successively, until V
n=(D/ (t1+ (n-1) * T)+D/ (t2+ (n-1) * T))＜V
m, turned for the 4th step.Annotate:
V
1Expression vehicle nothing in the 1st traffic signals Cycle Length is waited for by the required speed that reaches in this crossing;
V
2Expression vehicle nothing within the 2nd traffic signals Cycle Length time is waited for by the required speed that reaches in this crossing;
The like;
V
nExpression vehicle nothing within n traffic signals Cycle Length time is waited for by the required speed that reaches in this crossing; This speed can reduce along with the increase of n, drops to the minimum speed V of a certain setting of vehicle when this speed
mThe time, stop calculating.
The 4th step is from V
1, V
2V
nIn choose value V near the economic speed per hour of vehicle
X, turned for the 5th step.
The 5th step: determine to drive strategy
If V
X＞V
Limit, return to V
Limit, finish, and point out with V to the driver
LimitSpeed is travelled, otherwise continues;
If V
m＜V
X＜V
Limit, return to V
X, finish, and point out with V to the driver
XSpeed is travelled, otherwise continues;
If V
X＜V
m, without rreturn value, do not point out, finish.
The present invention has following useful technique effect:
After using this system, but the instantly prompting human pilot is taked the scientific and reasonable measure of controlling, steering vehicle need not to pass through the crossing with comparatively economical, safe speed most possibly with waiting for, this is for realizing automobile energy-saving, for the pressure of alleviating urban transportation, for the improvement of urban environment, can play impetus preferably.
Description of drawings
Fig. 1 is the structural principle schematic block diagram of radiofrequency launcher in the embodiment of the present invention.
Fig. 2 is the structural principle schematic block diagram of energy-saving driving strategy suggestion device in the embodiment of the present invention.
Fig. 3 is a kind of workflow diagram of energy-saving driving strategy suggestion device.
Fig. 4 is the algorithm flow chart of a kind of energy-saving driving strategy computing module of energy-saving driving strategy suggestion device loading.
Fig. 5 is the scene schematic diagram of computing example.
Marginal data: A1-intersection signal control device; The A2-radiofrequency emitting module; The A3-antenna; The B1-microprocessor; The B2-antenna; The B3-Receiver Module; B4-display and/or voice prompting device; The B5-GPS navigating instrument; The B6-battery; The A-crossing.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment:
The structure of embodiment is described in conjunction with Fig. 1 and Fig. 2.
A kind of energy-saving driving strategy prompt system based on vehicle-road interaction technology is comprised of the radiofrequency launcher that is arranged on the crossing (as shown in Figure 1) and the energy-saving driving strategy suggestion device (as shown in Figure 2) that is arranged on vehicle.
As shown in Figure 1, the crossing radiofrequency launcher is comprised of radiofrequency emitting module A2 and antenna A3; Obtain real-time multiphase traffic time allocation information from intersection signal control device A1, described signal is broadcasted away according to fixed communication protocol by radiofrequency emitting module A2 and antenna A3.
Radiofrequency launcher is arranged near the intersection signal control device, obtains following data from traffic signal control: phase item, phase place green time, green light interval time and the traffic signals cycle of crossing numbering, the present phase item in this crossing, current phase place green light excess time, other each phase places.
As shown in Figure 2, the tactful suggestion device of vehicle-mounted energy-saving driving mainly is comprised of microprocessor B1, antenna B2, Receiver Module B3, display and/or voice prompting device B4, GPS navigation instrument B5, battery B6.
In the present invention, vehicle-mounted energy-saving is driven tactful suggestion device and is arranged on vehicle interior, coordinates the task that automobile energy-saving is driven the strategy prompting of completing with GPS navigation instrument B5.Concrete, Receiver Module B3 receives the broadcast singal of this crossing traffic signal controller by antenna B2, and be sent to microprocessor B1, microprocessor B1 receives from the relevant information in GPS navigation instrument B5 simultaneously, can obtain one after microprocessor B1 COMPREHENSIVE CALCULATING can maximum possible pass through comparatively economic, the safe speed at this crossing without wait, and by display and/or voice prompting device B4, the driver is made corresponding prompting.
The programmed control flow process of above-mentioned energy-saving driving strategy suggestion device is described below with reference to Fig. 3 as shown in Figure 3:
The first step: beginning, system start;
Second step: system initialization;
The 3rd step: microprocessor B1 begins to read vehicle-mounted GPS navigator information, and information comprises: the speed limit in this crossing ID, remaining mileage, this highway section;
The 4th step: microprocessor B1 processes the transport information that receives, and therefrom extracts the multiphase traffic time allocation information at this crossing;
The 5th step: microprocessor B1 energy saving in running is driven tactful computing module (as shown in Figure 4);
The 6th step: automobile energy-saving is driven strategy be prompted to human pilot by display and/or voice prompting device;
The 7th step: returned to for the 3rd step, carry out computing next time.
Reference when above-mentioned demonstration result supplies human pilot as steering vehicle.
The below illustrates the operational method of energy-saving driving strategy computing module again with an object lesson.
Suppose that a certain car of a certain moment travels from south to north, 400 meters, the place ahead arrival crossing A requires to keep straight at this crossing and passes through, crossing A has four phase places, and thing craspedodrome phase item is 1, and the thing left turn phase number is 2, north and south craspedodrome phase item is 3, and the north and south left turn phase number is 4.
Phase place (namely the first phase place) the phase item of supposing current time is 1, i.e. green light t excess time of p1=1, the first phase place
r=10 seconds, the phase item of the second phase place was the duration t of p2=2, the second phase place
p2=6 seconds, the duration t of the phase item p3=3 of third phase position, third phase position
p3=19 seconds, the phase item of the 4th phase place was the duration t of p4=4, the 4th phase place
p4=5 seconds; Phase place green light T interval time
i=5 seconds (just have in the time of phase alternation phase place green light interval time); Traffic signals cycle T=68 second; Remaining mileage D=400 rice; Vehicle crossing is forwardly kept straight on, so vehicle pass-through phase item n=3; Highway section Maximum speed limit V
Limit=70 kilometers/hour, the minimum speed V of Vehicle Driving Cycle
mBe 1 kilometer/hour, the economic speed per hour V of vehicle
e=80 kilometers/hour.As shown in Figure 5.
The below describes the implementation method of prompt system of the present invention according to above-mentioned condition.
The first step, at first, vehicle-mounted energy-saving is driven tactful suggestion device can receive by Receiver Module the transport information of crossing A broadcasting, then, vehicle-mounted energy-saving is driven tactful suggestion device can extract the information such as the numbering of this crossing A, remaining mileage that vehicle arrives crossing A, highway section speed limit from the GPS navigation instrument, the various data input energy-saving driving strategy computing modules that extract are calculated;
Second step calculates the nearest time interval [t1, t2] that the vehicle desired phase is let pass;
According to known conditions, the required current phase item n=3=p3 of vehicle, according to technical scheme as can be known, and when n=p3, t1=t
r+ T
i+ t
p2+ T
i=10+5+6+5=26 (second), t2=t1+t
p3=26+19=45 (second).
In the 3rd step, calculate V
1, V
2V
n:
V
1=(400/26+400/45)/2=12.15 (meter per second)=43.7 (kilometer/hour),
V
2=(400/ (26+68)+400/ (45+68))/2=3.9 (meter per second)=14 (kilometer/hour),
V
3=(400/ (26+68*2)+400/ (45+68*2))/2=2.34 (meter per second)=8.42 (kilometer/hour),
V
4=(400/ (26+68*3)+400/ (45+68*3))/2=1.68 (meter per second)=6.05 (kilometer/hour),
V
5=(400/ (26+68*4)+400/ (45+68*4))/2=1.3 (meter per second)=4.68 (kilometer/hour),
V
21=(400/ (26+68*20)+400/ (45+68*20))/2=0.287 (meter per second)=1.03 (kilometer/hour),
V
22=(400/ (26+68*21)+400/ (45+68*21))/2=0.274 (meter per second)=0.986 (kilometer/hour),
V
22＜1 kilometer/hour, stop calculating.
The 4th step is from V
1, V
2..., V
22In choose near the economic speed per hour V of vehicle
eThe value of=80 kilometers/hour gets V
X=V
1=43.7 kilometers/hour.
In the 5th step, select to drive strategy:
Due to V
m＜V
1＜V
Limit, the energy-saving driving strategy module will be returned to V
1, and will point out V to the driver
1The travel speed of=43.7 kilometers/hour.
Current phase place in embodiment (namely the first phase place) phase item is that the meaning of 1 expression is: vehicle is in 400 meters those moment of distance junction ahead A, and crossing A east-west direction is kept straight on and is in the clearance state.
Above embodiment is only one of the specific embodiment of the present invention, in practice, and possible p1=2, at this moment, p2=3, p3=4, p4=1; Or p1=3, at this moment, p2=4, p3=1, p4=2; Or p1=4, at this moment, p2=1, p3=2, p4=3.So protection scope of the present invention is not limited to embodiment, any people who is familiar with this technology can understand conversion or the replacement expected in the disclosed technical scope of the present invention, all should be encompassed in of the present invention comprise scope within.
Claims (1)
1. the method for work based on the energy-saving driving strategy prompt system of vehicle-road interaction technology, is characterized in that, described energy-saving driving strategy prompt system comprises the two large divisions:
The one, be contained in the radiofrequency launcher that can obtain this crossing traffic information that the crossing is located, this radiofrequency launcher obtains transport information from the signal controller at crossing, place, and by the less radio-frequency transmitter module overseas broadcast in radiofrequency launcher;
Two are mounted in the energy-saving driving strategy suggestion device on vehicle, and this device is comprised of software and hardware two parts, and hardware components is comprised of microprocessor, radio frequency receiver, vehicle-mounted GPS navigator and display and/or voice prompting device; Software section mainly refers to the energy-saving driving strategy computing module in microprocessor; Provide real time data by vehicle-mounted GPS navigator, by the radio frequency receiver receiving traffic information, microprocessor mates transport information and real time data, transferring to the energy-saving driving strategy computing module calculates, obtain automobile energy-saving and drive strategy, and automobile energy-saving driving strategy is prompted to human pilot by display and/or voice prompting device;
Above-mentioned transport information comprises: phase item, phase place green time, green light interval time and the traffic signals cycle of crossing numbering, current phase item, current phase place green light excess time, other each phase places; Described phase place refers to: in one-period, and a certain or several the right-of-ways that traffic flow obtains on level-crossing;
The real time data of above-mentioned vehicle-mounted GPS navigator comprises: signal controlled junctions numbering, the position that vehicle front is about to reach arrived front signal and controlled the remaining mileage at crossing, vehicle travel direction and the highway section speed limit at crossing forwardly;
Method of work is: during work, when vehicle enters the place ahead and is the highway section of signal controlled junctions, the energy-saving driving strategy suggestion device will receive the place ahead by radio frequency receiver and arrive the transport information that place, crossing broadcaster broadcasts, and the real time data of obtaining vehicle-mounted GPS navigator, and transport information and real time data are mated, transferring to the energy-saving driving strategy computing module calculates, obtain automobile energy-saving and drive strategy, and automobile energy-saving driving strategy is prompted to human pilot by display and/or voice prompting device;
The detailed operation step is as follows:
The first step: beginning, system start;
Second step: system initialization;
The 3rd step: microprocessor begins to read vehicle-mounted GPS navigator information, and information comprises: signal controlled junctions numbering, the position that vehicle front is about to reach arrived front signal and controlled the remaining mileage at crossing, vehicle travel direction and the highway section speed limit at crossing forwardly;
The 4th step: the transport information that the microprocessor processes radio frequency receiver receives, and therefrom extracting the multiphase traffic time allocation information at this crossing, transport information comprises: phase item, phase place green time, green light interval time and the traffic signals cycle of crossing numbering, current phase item, current phase place green light excess time, other each phase places;
The 5th step: the microprocessor energy saving in running is driven tactful computing module; Operational method is as follows:
The 5.1st step: set each phase place and the phase place duration at this crossing, be called successively the first phase place, first phase place green light excess time; The second phase place, the second phase place green time; Third phase position, third phase position green time; The 4th phase place, the 4th phase place green time ... the rest may be inferred; Wherein, the first phase place is current phase place, and the first phase place green light is the green light excess time after current time begins excess time; Wherein: the phase item of the first phase place is that be t the excess time of p1, the first phase place
r, the second phase place the phase item be that the duration of p2, the second phase place is t
p2, the third phase position the phase item be that the duration of p3, third phase position is t
p3, the 4th phase place the phase item be that the duration of p4, the 4th phase place is t
p4, by that analogy;
Described current phase place refers to the current phase place that is in the clearance state in this crossing;
Setting phase place green light interval time is T
i, the traffic signals cycle is T, the remaining mileage that the crossing is controlled to front signal in the position is D; According to vehicle forwardly the travel direction at crossing to obtain vehicle pass-through phase item with phase matching be n; The highway section Maximum speed limit is V
Limit, the minimum speed of Vehicle Driving Cycle is V
m
In the 5.2nd step, calculate the nearest time interval [t1, t2] that the vehicle desired phase is let pass;
If 1 n=p1, t1=0, t2=t
r, turned for the 5.3rd step, otherwise continue;
If 2 n=p2, t1=t
r+ T
i, t2=t1+t
p2, turned for the 5.3rd step, otherwise continue;
If 3 n=p3, t1=t
r+ T
i+ t
p2+ T
i, t2=t1+t
p3, turned for the 5.3rd step, otherwise continue;
If 4 n=p4, t1=t
r+ T
i+ t
p2+ T
i+ t
p3+ T
i, t2=t1+t
p4, turned for the 5.3rd step, otherwise continue;
By that analogy;
The 5.3rd step, calculate vehicle nothing in n traffic signals Cycle Length and wait for by the required speed that reaches in this crossing, use respectively V
1, V
2..., V
nExpression,
Wherein, V
1, V
2V
n, V
1If=(D/t1+D/t2)/2 are t1=0, V
1=1.2D/t2; V
2=(D/ (t1+T)+D/ (t2+T))/2;
Calculate successively, until V
n=(D/ (t1+ (n-1) * T)+D/ (t2+ (n-1) * T))/2＜V
m, turned for the 5.4th step; Annotate:
V
1Expression vehicle nothing in the 1st traffic signals Cycle Length is waited for by the required speed that reaches in this crossing;
V
2Expression vehicle nothing within the 2nd traffic signals Cycle Length time is waited for by the required speed that reaches in this crossing;
By that analogy;
V
nExpression vehicle nothing within n traffic signals Cycle Length time is waited for by the required speed that reaches in this crossing; This speed can reduce along with the increase of n, drops to the minimum speed V of a certain setting when this speed
mThe time, stop calculating;
The 5.4th step is from V
1, V
2V
nIn choose value V near the economic speed per hour of vehicle
X, turned for the 5.5th step;
The 5.5th step: determine to drive strategy:
If V
X＞V
Limit, return to V
Limit, finish, and point out with V to the driver
LimitSpeed is travelled, otherwise continues;
If V
m＜V
X＜V
Limit, return to V
X, finish, and point out with V to the driver
XSpeed is travelled, otherwise continues;
If V
X＜V
m, without rreturn value, do not point out, finish;
The 6th step: automobile energy-saving is driven strategy be prompted to human pilot by display and/or voice prompting device;
The 7th step: returned to for the 3rd step, carry out computing next time.
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