CN104598988A - Electric vehicle charging station selection method based on charging reservation - Google Patents

Abstract

The invention discloses an electric vehicle charging station selection method based on charging reservation. The electric vehicle charging station selection method based on the charging reservation includes steps that 1) acquiring road information in an electric vehicle route, wherein the road information comprises distance, speed and the like; 2) judging whether the vehicle has already made a reservation, if so, turning to the step 7); 3) calculating to judge whether the SOC of the electric vehicle can meet the driving demand of the journey, if so, turning to the step 1), otherwise, entering the step 4); 4) finding passing charging stations, and calculating the time for arriving at each charging station, the shortest waiting time and the like of each charging station; 5) judging whether the time when the vehicle arrives at the charging station surpasses a certain limit range, if so, calculating the charging station selection possibility of the vehicle, and judging; 6) selecting according to said information, and enabling an electric vehicle charging selection system to send the selection result to a charging station management system; 7) judging whether the vehicle has arrived at the reserved charging station, if so, waiting for charging or charging directly; otherwise, continuing to run till arriving at the charging station.

Description

A kind of electric automobile charging station system of selection based on charging reservation

Technical field

The present invention relates to a kind of pure electric automobile charging system of selection, belong to charging electric vehicle control field, control also significant for the charging of other pure electric vehicles.

Background technology

Electric automobile is a kind of " green " vehicle.Along with electric automobile rapid, high volume is put on market, the problem of charge requirement and unreasonable distribution, namely driver can not find charging station or the charging station that finds and cannot meet the problems such as vehicle charging demand and become increasingly conspicuous, and a lot of driver is produced worried and frightened to continuous distance travelled.Especially when after battery electric quantity drop by half, driver, in order to avoid automobile is because battery is inadequate " sitting ", dare not continue to travel, and blindly finds charging station everywhere.In addition, because charging electric vehicle time relative orthodox car refueling time will be grown, therefore more easily cause the automobile waiting in line to charge too much and driver to queue up the problem of charging waits for too long.These problems all cause direct impact to the marketing of electric automobile, the more important thing is the process having influence on China's Urban Transportation field and reduce discharging.Therefore, how to make between a large amount of electric automobile and charging station, carrying out coordination to charge, prevent from a part of charging station from queuing up to charge, the problem of the distribution inequality of another charging station free time, reducing the queue waiting time that driver is unnecessary, is one of current electric automobile and charging station mutual Charge Management aspect sixty-four dollar question.

In fact, along with the development of wireless communication technique, wireless location technology, intelligent transportation system etc., realize information sharing and transmit becoming possibility between electric automobile and charging station, electric automobile and Traffic Systems etc.Electric automobile can obtain its information running front charging station and road ahead congestion status in time, and charging station also can obtain the electric automobile information needing to carry out charging in time.Therefore, by information sharing and transmission, electric automobile and charging station can be made all to accomplish " shooting the arrow at the target " one of effective means solving electric automobile and charging station charging problems beyond doubt.But, because prediction automobile arrives the accuracy restriction of charging station time, and driver selects the randomness of charging station, the electromobile charging management method of current China does not also consider the function that electric automobile application is preengage, and does not solve yet and coordinates and manages problem with charging station.

The present invention proposes a kind of charging electric vehicle system of selection based on charging reservation, and the method has following characteristics and advantage:

1, ground charging station charging management system is sent to by prediction being arrived the time meeting the charging station of charging requirement, thus obtain the most rationally queuing up the charging stand-by period of this charging station, calculate this electric automobile to estimate to wait in line the duration of charging, and be supplied to driver and select, make driver can schedule ahead stroke, charging waits for too long of queuing up when avoiding driver to arrive charging station;

2, queuing probability and the parameter of charging station may be selected by setting up electric automobile, and be supplied to driver and select reference frame as charging station, travel before avoiding driver blindly or the problem of blindly charging.

3, by sending the reservation duration of charging in advance, not only making to coordinate between electric automobile and charging station to arrange charging, and improve the benefit of charging station.

Summary of the invention:

Because the charging electric vehicle system of selection of current China does not have to carry out coordination Charge Management between ground charging station charging management system, therefore cannot solve the problem of driver to distance travelled fear, have impact on the market degree of recognition of pure electric automobile.Queue up charging stand-by period and avoid automobile to arrive after charging station finding that charging station equipment cannot meet the problem of vehicle charging demand to reduce driver, the present invention establishes an efficient charging electric vehicle system of selection, the method is passed through vehicle charging requirement, arrive the information such as charging station time and send to charging station charging management system, and obtain charging pile parameter from charging station management system, wait in line the data such as duration of charging, calculate automobile to estimate to wait in line the duration of charging, auxiliary driver carries out charging station selection, the charging pile not only making driver to choose queuing time the shortest charges, and the charging contradiction solved between a large amount of electric automobile and charging station.

In order to realize charging electric vehicle system of selection, need first to set up charging electric vehicle selective system, this system comprises three parts: Part I charge station information system, mainly determine the charging station of process on running car path, and obtain the data that charging station management system sends, obtain queuing time etc.; The data that automobile obtains from ITS are mainly resolved by Part II ITS data analysis system, obtain the average speed of different sections of highway on running car path; Backup system is selected in Part III charging, mainly calculates the time that automobile arrives charging station in certain limit, and the charging station charged outside stand-by period and certain limit is by the probable value selecting to charge.

The present invention is achieved through the following technical solutions.Based on a planing method for reservation system, comprise the following steps:

Step 1): obtain No. ID of each road in automobile path, average link speed and mileage.First charging electric vehicle selective system obtains No. ID and mileage of each road automobile path from onboard navigation system.Charging electric vehicle selective system obtains the average link speed of No. ID, above-mentioned road from ITS system.The average speed found running car section from ITS is respectively mileage is

Step 2): judge whether automobile preengages charging station, if preengage, perform step 7).

Step 3): calculate the traveling that can electric automobile SOC meet this stroke.If can meet, then circulation performs step 1); If not, then step 4 is entered).

Then by time that each section spends:

$t_i^S=\frac{d_i^S}{{\stackrel{\‾}{V}}_i^S}\×3600$

The driving force of automobile is:

$F_t=F_f+F_w+F_i+F_j=G\·f_r+\frac{C_D{\mathrm{Av}}^2}{21.15}+G\·\sin \left(\mathrm{arctgi}\right)+\mathrm{\δ}\·m\frac{\mathrm{dv}}{\mathrm{dt}}$

In formula, road section length, Km; section speed Km/h; F _tfor Automobile drive power, N; F _ffor the resistance to rolling of running car, N; F _wfor air resistance during running car, N; F _igrade resistance during for travelling, N; F _jfor acceleration resistance during running car, N; f _rfor coefficient of rolling resistance; C _dfor coefficient of air resistance; A is the front face area of automobile, m ²; V is the speed of a motor vehicle, km/h; I is road grade; G is automobile gravity, N; δ is vehicle rotary mass conversion coefficient, kgm ²; M is car mass, kg.

If do not consider the gradient of road, rotate the power consumed, then automobile by the power in this section is:

$P_i^S=F_i^S{\stackrel{\‾}{v}}_i^S=\frac{G\·f_r\·{\stackrel{\‾}{v}}_i^S}{3.6}+\frac{C_{D}A}{76.14}{\left({\stackrel{\‾}{v}}_i^S\right)}^3$

Ignore the change in voltage in battery discharge procedure, then can calculate the battery discharge current in each section:

$I_i^S=\frac{P_i^S}{U_{\mathrm{bat}}}$

In formula, U _batfor sparking voltage.

Each section battery discharge capacity is

${\mathrm{\ΔQ}}_i^S=I_i^S\·\frac{t_i^S}{3600}$

So automobile is by after whole stroke, and battery SOC is:

${\mathrm{SOC}}_e={\mathrm{SOC}}_s-\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ΔQ}}_i^S}{C}$

In formula, SOC _efor the electricity that automobile is current; SOC _sfor the electricity that automobile is current; C is the capacity Ah of automobile batteries; N is section number.

Consider the serviceable life of battery, if SOC _e< 0.3, then illustrate that battery cannot ensure running car full stroke; If SOC _e>=0.3, then illustrate that battery can ensure running car full stroke.

Step 4): according to the ID of each road in automobile path search in charge station information system through No. ID, charging station, and earthward charging station charging management system send No. ID, charging station.Calculating automobile arrives the stand-by period (queuing time adds the duration of charging) after each charging station.

1, calculate automobile and arrive charging station required time: the length of the different roads driven through needed for running car to charging station is D _i, the average link speed of every bar road is suppose that the time that automobile arrival charging station travels is t _drive, then predict that the whole service time is

$t_{\mathrm{drive}}=\underset{k=i}{\overset{j}{\mathrm{\&Sigma;}}}\frac{D_k}{{\stackrel{\&OverBar;}{v}}_k}$

In formula, i is section number, automobile present place; J is section number, charging station place;

2, predict that automobile arrives charging station, wait for vacant charging pile Time Calculation method:

Suppose that different charging pile in existing charging station has been queued up and time of preengaging is automobile time of arrival is t _drive, then, when predicting that automobile arrives charging station, wait for that different charging pile vacant time is

$t_{\mathrm{wait}}^n=\left\{\begin{array}{cc}0& t_{\mathrm{zdz}}^n<t_{\mathrm{drive}}\\ t_{\mathrm{zdz}}^n-t_{\mathrm{drive}}& t_{\mathrm{zdz}}^n\&GreaterEqual;t_{\mathrm{drive}}\end{array}\right.$

So automobile estimates the time waiting for vacant charging pile after entering charging station and the charging pile No. waited in turn is q.

3, this car duration of charging computing method are predicted:

Then predict that this car duration of charging is t _charge.

$t_{\mathrm{ch}\arg e}=\frac{\mathrm{\&Delta;Q}}{I_{\mathrm{ch}\arg e}}\&times;3600$

In formula, Δ Q is the electricity (unit: Ah) needed for running car to terminal; I _chargefor charging current A.

4, the charging stand-by period after then prediction automobile arrives each charging station is:

$t_{\mathrm{cd}}=t_{\mathrm{wait}}^q+t_{\mathrm{ch}\arg e}$

Step 5): due to running car time prediction within the scope of certain hour accurately, in order to prevent automobile reservation time of arrival and actual time of arrival difference excessive, affect the benefit of charging station.If this car arrives the time of charging station within the limits prescribed, driver can directly preengage this charging station.For the vehicle arriving the charging station time and exceed certain limited field, then need to calculate the possibility that this charging station can be selected by this car.

Calculate the possibility that this charging station can be selected by this car:

Calculate and can not travel full journey in this front side, there is no reservation and the vehicle number n of this charging station may be preengage _v, then the probability that can be selected by this car of this charging station this charging station can be preengage when probability is more than or equal to 0.25.

Step 6): estimated wait time or this charging station can be sent to driver as the reference selecting charging station by charging electric vehicle selective system by the possibility selected.Driver selects charging station according to above-mentioned information, then selection result is sent to charging station management system by charging electric vehicle selective system.

Step 7): judge whether automobile has arrived reservation charging station, if arrived, then wait for or directly charge; If do not arrived, then electric automobile continues to travel until arrive charging station.

Accompanying drawing illustrates:

figure1 charging electric vehicle system of selection flow process figure;

figure2 test roads figure;

figurethe stand-by period column of 3 each electric automobiles figure;

embodiment:

Below in conjunction with attached figurethe invention will be further described.

In order to improve electric automobile property easy to use, charging electric vehicle the shortest time is for just having corresponding vacant charging pile for it when entering charging station.In order to reach this object, except building except charging station energetically, the more important thing is the charging relation between equilibrium charging station and electric automobile, the phenomenon avoiding electric automobile " to flock together " charging occurs.For this reason, the present invention is by setting up the electric automobile charging station charging management system based on reservation management, by initiatively obtaining the requirement that electric automobile driver selects to charge, charging relation between reasonable coordination electric automobile and charging station, at utmost improve the benefit of charging station and reduce electric automobile driver at charging station queue waiting time, detailed process as figureshown in 1.

Embodiment 1

Certain road has 7 sections, supposes that road-section average travel speed is constant, road section information as following table 1

table 1each road section information

Section number	Distance (Km)	Average link speed (Km/h)
			Section 1	6	50
Section 2	7	60
			Section 3	6	50
Section 4	6	50
			Section 5	6	60
Section 6	6	50
			Section 7	10	40

Charging station 1, in the starting point in section 5, has 4 charging piles, supposes that the appointment and queuing time (unit s) of each charging pile is: 1000,1000,1000,1000.

Charging station 2 has 4 charging piles at the terminal in section 1, supposes that the appointment and queuing time (unit s) of each charging pile is: 1800,1800,1800,1800.

The information of electric automobile as following table

table 2the initial state information of electric automobile

Below only for electric automobile 1,2, when there is reservation system

Step 1): obtain No. ID of each road in automobile path, average link speed and mileage.First charging electric vehicle selective system obtains No. ID and mileage of each road automobile path from onboard navigation system.Charging electric vehicle selective system obtains the average link speed of No. ID, above-mentioned road from ITS system.The average speed found running car section from ITS is respectively ${\stackrel{\&OverBar;}{v}}_1^S=50,{\stackrel{\&OverBar;}{v}}_2^S=60,{\stackrel{\&OverBar;}{v}}_3^S=50,{\stackrel{\&OverBar;}{v}}_4^S=50,{\stackrel{\&OverBar;}{v}}_5^S=60,{\stackrel{\&OverBar;}{v}}_6^S=50,$ ${\stackrel{\&OverBar;}{v}}_7^S=40,$ Mileage is $d_1^S=6\mathrm{Km},d_2^S=7\mathrm{Km}{d}_3^S=6\mathrm{Km}{d}_4^S=6\mathrm{Km}{d}_5^S=6\mathrm{Km}{d}_6^S=6\mathrm{Km}{d}_7^S=10\mathrm{Km}.$ Electric automobile is in section 1, and in the starting point in section 1, the speed of a motor vehicle is 50Km/h, current SOC value 0.4.Electric automobile is in section 2, and at the starting point 100m place in distance section 1, the speed of a motor vehicle is 50Km/h, current SOC value 0.5.

Step 2): judge whether automobile preengages charging station, electric automobile 1,2 does not all preengage any charging station at present, then carry out step 3.

Step 3): calculate the traveling that can electric automobile electricity meet this stroke.

1, electric automobile 1 spent by each section time (unit: s):

$t_i^S=\frac{d_i^S}{{\stackrel{\&OverBar;}{V}}_i^S}\&times;3600$

$\begin{array}{ccccccc}{t}_1^S=432& t_2^S=420& t_3^S=432& t_3^S=432& t_5^S=360& t_6^S=432& t_7^S=900\end{array}$

The time that in like manner electric automobile 2 is spent by each section also can calculate

$\begin{array}{ccccccc}{t}_1^S=424& t_2^S=420& t_3^S=432& t_3^S=432& t_5^S=360& t_6^S=432& t_7^S=900\end{array}$

The driving force of each section automobile is:

$F_t=F_f+F_w+F_i+F_j=G\&CenterDot;f_r+\frac{C_D{\mathrm{Av}}^2}{21.15}+G\&CenterDot;\sin \left(\mathrm{arctgi}\right)+\mathrm{\&delta;}\&CenterDot;m\frac{\mathrm{dv}}{\mathrm{dt}}$

In formula, F _tfor Automobile drive power, N; F _ffor the resistance to rolling of running car, N; F _wfor air resistance during running car, N; F _igrade resistance during for travelling, N; F _jfor acceleration resistance during running car, N; f _rfor coefficient of rolling resistance; C _dfor coefficient of air resistance; A is the front face area of automobile, m ²; V is the speed of a motor vehicle, km/h; I is road grade; G is automobile gravity, N; δ is vehicle rotary mass conversion coefficient, kgm ²; M is car mass, kg.

If do not consider the gradient of road, rotate the power consumed, then automobile by the power in this section is:

$P_i^S=F_i^S{\stackrel{\&OverBar;}{v}}_i^S=\frac{G\&CenterDot;f_r\&CenterDot;{\stackrel{\&OverBar;}{v}}_i^S}{3.6}+\frac{C_{D}A}{76.14}{\left({\stackrel{\&OverBar;}{v}}_i^S\right)}^3$

Ignore the change in voltage in battery discharge procedure, then can calculate the battery discharge current in each section:

$I_i^S=\frac{P_i^S}{U_{\mathrm{bat}}}$

In formula, U _batfor sparking voltage, 336V.

2, electric automobile 1 each section battery discharge capacity is:

${\mathrm{\&Delta;Q}}_i^S=I_i^S\&CenterDot;t_i^S$

$\begin{array}{ccccc}{\mathrm{\&Delta;Q}}_1^S=1.58& {\mathrm{\&Delta;Q}}_2^S=2.13& {\mathrm{\&Delta;Q}}_3^S=1.58& {\mathrm{\&Delta;Q}}_4^S=1.58& {\mathrm{\&Delta;Q}}_5^S=1.83\end{array}$

$\begin{array}{cc}{\mathrm{\&Delta;Q}}_6^S=1.58& {\mathrm{\&Delta;Q}}_7^S=2.30\end{array}$

So electric automobile 1 is by after whole stroke, and battery SOC is:

${\mathrm{SOC}}_e={\mathrm{SOC}}_s-\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;Q}}_i^S}{C}=0.085$

Electric automobile 2 each section battery discharge capacity is:

${\mathrm{\&Delta;Q}}_i^S=I_i^S\&CenterDot;t_i^S$

$\begin{array}{ccccc}{\mathrm{\&Delta;Q}}_1^S=1.55& {\mathrm{\&Delta;Q}}_2^S=2.13& {\mathrm{\&Delta;Q}}_3^S=1.58& {\mathrm{\&Delta;Q}}_4^S=1.58& {\mathrm{\&Delta;Q}}_5^S=1.83\end{array}$

$\begin{array}{cc}{\mathrm{\&Delta;Q}}_6^S=1.58& {\mathrm{\&Delta;Q}}_7^S=2.30\end{array}$

So electric automobile 2 is by after whole stroke, and battery SOC is:

${\mathrm{SOC}}_e={\mathrm{SOC}}_s-\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;Q}}_i^S}{C}=0.186$

In formula, SOC _sfor the electricity that automobile is current; SOC _efor automobile dump energy; C is the capacity 40Ah of automobile batteries; N is section number.

Consider the serviceable life of battery, the dump energy of electric automobile 1,2 is all less than 0.3, then illustrate that battery cannot ensure running car full stroke.Then enter step 5.

Step 4): according to the ID of each road in automobile path search in charge station information system through No. ID, charging station, and earthward charging station charging management system send No. ID, charging station.Calculating automobile arrives the charging stand-by period (queue waiting time and duration of charging sum) after each charging station.

1, calculate electric automobile and arrive charging station required time:

For electric automobile 1, according to step 4) algorithm, this car can only drive to section 3, therefore can only arrive charging station 2, and time needed for charging station 2 of arrival is t _drive=431s

For electric automobile 2, according to step 4) algorithm, this car can arrive charging station 1, can arrive charging station 2 again, and time needed for charging station 1 of arrival is t _drive1=1708s, the time arrived needed for charging station 2 is t _drive2=424

2, calculate electric automobile and arrive charging station, wait for vacant charging pile Time Calculation:

The time of having queued up for different charging pile in the existing charging station of electric automobile 12 and preengage is work as n=1,2,3, when 4, be 1800s, then, when predicting that automobile arrives charging station, wait for that different charging pile vacant time is

$t_{\mathrm{wait}}^n=\left\{\begin{array}{cc}0& t_{\mathrm{zdz}}^n<t_{\mathrm{drive}}\\ t_{\mathrm{zdz}}^n-t_{\mathrm{drive}}& t_{\mathrm{zdz}}^n\&GreaterEqual;t_{\mathrm{drive}}\end{array}\right.$

Estimate after so electric automobile 1 enters charging station to wait for that the time of vacant charging pile is and the charging pile No. waited in turn is 1.

The time of having queued up for different charging pile in electric automobile 2 charging station 1 and preengage is work as n=1,2,3, be 1000s when 4, in charging station 2, different charging pile has been queued up and time of preengaging is work as n=1,2,3, when 4, be 1800s,

$t_{\mathrm{wait}}^n=\left\{\begin{array}{cc}0& t_{\mathrm{zdz}}^n<t_{\mathrm{dri}}\\ t_{\mathrm{zdz}}^n-t_{\mathrm{drive}}& t_{\mathrm{zdz}}^n\&GreaterEqual;t_{\mathrm{dri}}\end{array}\right.$

Estimate after so electric automobile 2 arrives charging station 1 to wait for that the time of vacant charging pile is

Estimate after arriving charging station 2 to wait for that the time of vacant charging pile is

3, charging electric vehicle Time Calculation method is predicted:

Then predict that this car duration of charging is t _charge.

According to step 4) computing method, the SOC that can calculate when electric automobile 1 drives to charging station 2 is 0.36, must reach the electricity 8.6Ah that terminal also needs at last simultaneously.Therefore the duration of charging is:

$t_{\mathrm{ch}\arg e}=\frac{\mathrm{\&Delta;Q}}{I_{\mathrm{ch}\arg e}}\&times;3600=572s$

In formula, Δ Q is the electricity needed for running car to terminal, I _chargefor charging current 54A.

SOC when electric automobile 2 drives to charging station 2 is 0.46, and the electricity Δ Q that must reach terminal at last also needs simultaneously is 4.6Ah.Therefore the duration of charging is:

$t_{\mathrm{ch}\arg e}=\frac{\mathrm{\&Delta;Q}}{I_{\mathrm{ch}\arg e}}\&times;3600\&ap;300s$

SOC when electric automobile 2 drives to charging station 1 is 0.33, and the electricity Δ Q that must reach terminal at last also needs simultaneously is 4.51Ah.Therefore the duration of charging is:

$t_{\mathrm{ch}\arg e}=\frac{\mathrm{\&Delta;Q}}{I_{\mathrm{ch}\arg e}}\&times;3600\&ap;300s$

4, the charging stand-by period after then calculating electric automobile 1 arrives charging station 2 is:

$t_{\mathrm{cd}}=t_{\mathrm{wait}}^q+t_{\mathrm{ch}\arg e}=1940s$

In like manner can calculate electric automobile 2 arrive charging station 1,2 after the charging stand-by period be respectively 300s, 1676s.

Step 5): due to running car time prediction within the scope of certain hour accurately, in order to prevent automobile reservation time of arrival and actual time of arrival difference excessive, affect the benefit of charging station.Need the scope whether time of calculating electric automobile arrival needed for charging station is specifying.Electric automobile 1 arrives time needed for charging station 2 in the scope 1600s of regulation.If the stand-by period selecting charging station 1 total for electric automobile 2 is shorter, but exceed the scope 1600s of regulation because electric automobile 2 time arrived needed for charging station 1 is 1708s.Therefore the probability that calculating charging station 1 can be selected by electric automobile 2 is needed.

Calculate the probability that charging station 1 can be selected by electric automobile 2:

Calculate the front of electric automobile 2 can not travel full journey, there is no reservation and the vehicle number n of this charging station may be preengage _vbe 3, then the probability that can be selected by this car of this charging station probability equals 0.25 can preengage this charging station 1.

Step 6): estimated wait time sends to driver as the reference selecting charging station by charging electric vehicle selective system.Driver selects charging station according to above-mentioned information, and charging station 2 selected by electric automobile 1, and charging station 1 selected by electric automobile 2.Then the information such as above-mentioned selection result and duration of charging are sent to charging station management system by charging electric vehicle selective system.

Step 7): electric automobile 1 and 2 arrives the charging station of reservation on time, waits for or directly carry out charging service before charging station arranges electric automobile to the charging pile of making an appointment in advance.

So far, the calculating of reservation system is had to leave it at that.Selection situation for the electric automobile not having reservation system adopts nearby principle, by figure2 obtain electric automobile 1 selects charging station 1, and electric automobile 2 also selects charging station 1.Stand-by period and duration of charging etc. can calculate according to above-mentioned computing method.

All the other vehicles (electric automobile 3,4,5,6) also can calculate as stated above, thus obtain following result

Compare with the charging station selection result without reservation system, automobile select charging station result as following table 3

Vehicle number	SOC	Reservation system is had to preengage charging station number	Charging station number is selected without reservation system
				1	0.4	2	2
2	0.5	1	2
				3	0.5	1	2
4	0.45	1	1
				5	0.4	1	1

Stand-by period of each electric automobile as following table 4

Vehicle number	There is reservation system stand-by period (s)	Without reservation system stand-by period (s)
			1	1940	1940
2	300	1679
			3	300	1684
4	330	330
			5	460	460

From table 3with table 4in can obtain the charging station of electric automobile under having reservation system and not having reservation system and select situation.By figure3 can clearly find out when there being reservation system, and the stand-by period of electric automobile 2 and 3 obviously reduces, and not only reduces the stand-by period of driver, thus also make the efficiency of charging station be improved.

The present invention is based on software Matlab, carry out the charging station selection under controlling with or without reservation system and the comparative analysis of stand-by period.

table 5embodiment 1 obtains average latency contrast table

From table 5in can obtain, electric automobile has reservation system according to adopting and does not adopt the average latency of each electric automobile compared with reservation system to decrease 9 minutes.Therefore, adopt and have the selective system of reservation can shorten the charging stand-by period of electric automobile effectively significantly, thus improve running efficiency.

Claims (4)

1. Based on a major trunk roads speed of a motor vehicle planing method for isolated intersection traffic signal message, comprise the following steps:

   Step 1) obtain road information in electric automobile path and comprise distance, speed etc.;

   Step 2) judge whether automobile is preengage, if so, forward step 7 to);

   Step 3) calculate the traveling that can electric automobile SOC meet this stroke;

   Step 4) search through charging station, calculate and arrive time of charging station, and in the shortest stand-by period etc. of each charging station;

   Step 5) judge that vehicle arrives the charging station time and whether exceeded certain limited field, if it is need to calculate the possibility that this charging station can be selected by this car;

   Step 6) to select according to above-mentioned information, selection result is sent to charging station management system by charging electric vehicle selective system;

   Step 7) judge whether automobile has arrived reservation charging station, if arrived, then wait for or directly charge; Otherwise continue to travel until arrive charging station.

   1. method according to claim 1, is characterized in that, described step 1) obtain the information such as road data, the speed of a motor vehicle by onboard navigation system and intelligent transportation system.
2. 2. method according to claim 1, is characterized in that, described step 3) by following formulae discovery automobile by the battery electric quantity after whole stroke in formula, SOC _efor automobile dump energy; SOC _sfor the electricity that automobile is current; for the electricity Ah that each section consumes; C is the capacity Ah of automobile batteries; N is section number.
3. 3. method according to claim 1, is characterized in that, described step 4) possibility that can be selected by this car by this charging station of following formulae discovery wherein n _vfor full journey can not have been travelled in this vehicle front, there is no the vehicle number of preengaging and this charging station may be preengage.
4. 4. method according to claim 1, is characterized in that, described method is based on software Matlab, and application model carries out controlling lower charging station selection and the comparative analysis of stand-by period with or without reservation system.