CN103213504B - A kind of electronlmobil continual mileage evaluation method - Google Patents

Abstract

The invention discloses a kind of electronlmobil continual mileage evaluation method, comprise the following steps: 1.1, obtain the path of planning and the microcosmic traffic state in this path future according to the departure place of setting, destination and time of departure; 1.2, based on obtain by second speed, acceleration calculation generalized variable; 1.3, choose the electric car electric energy rate of consumption model established according to different driving cycles, in conjunction with the generalized variable calculated, calculate the power consumption by second; 1.4, obtain the dump energy of present battery, calculate the dump energy of battery, in conjunction with the power consumption of vehicle, obtain remaining mileage through cycle calculations.Contemplated by the invention the impact of real traffic behavior on electronlmobil energy consumption, overcome the accurate not shortcoming of existing method estimated result.

Description

A kind of electronlmobil continual mileage evaluation method

Technical field

The present invention relates to electric vehicle engineering field, particularly relate to a kind of electronlmobil continual mileage evaluation method.

Background technology

In the face of the energy shortage that is on the rise and ecological deterioration problem, pure electric automobile, because having low energy consumption, zero-emission, low noise, high-energy source degree of utilization, the structure advantage such as simply and for ease of maintenaince, is subject to extensive concern.But limited capacity of cell makes the continual mileage of electronlmobil shorter, need repeatedly to charge in the process of trip.Therefore, estimate that the continual mileage of electronlmobil can make chaufeur obtain the remaining mileage of electronlmobil in real time exactly, and then reasonably select running route, give vehicle charging in time.Existing method of estimation is greatly mainly with the discharge current of present battery and the terminal voltage principal parameter as estimation remaining mileage, but the change that discharge current under the true traffic behavior that do not look to the future and terminal voltage occur, make estimated result accurate not.

Summary of the invention

The technical matters that the present invention solves is how accurately to estimate electronlmobil continual mileage, for chaufeur choose reasonable running route, in time charging provide foundation.

The embodiment of the invention discloses a kind of electronlmobil continual mileage evaluation method, comprise the following steps:

1.1, the path of planning and the microcosmic traffic state in this path future is obtained according to the departure place of setting, destination and time of departure;

1.2, based on obtain by second speed, acceleration calculation generalized variable;

1.3, choose the electric car electric energy rate of consumption model established according to different driving cycles, in conjunction with the generalized variable calculated, calculate the power consumption by second;

1.4, obtain the dump energy of present battery, calculate the dump energy of battery, in conjunction with the power consumption of vehicle, obtain remaining mileage through cycle calculations.

Further, as preferably, described generalized variable comprises: traffic behavior, road grade, battery-driven car weight, Windshield and rolling resistance, A=f (V, a, grade, m, S, C), and wherein, A is generalized variable; V is electronlmobil momentary velocity; A is electronlmobil instantaneous acceleration; Grade is the gradient; M is electronlmobil quality; S is that electronlmobil keeps out the wind area; C is rolling resistance.

Further, as preferably, described driving cycle comprises accelerating mode, decelerating mode, at the uniform velocity operating mode and idling operation.

Further, as preferably, in described step 1.3, electric car electric energy rate of consumption model establishment step is as follows:

4.1, generalized variable is introduced, the synthesis that this generalized variable is traffic behavior, road grade, electronlmobil weight and formal parameter affect the parameter of electric energy; Based on the speed, acceleration/accel, road grade, weight etc. of the electronlmobil obtained in advance by second, calculate generalized variable value per second and power consumption per second; A=f (V, a, grade, m, S, C), wherein, A is generalized variable; V is electronlmobil momentary velocity; A is electronlmobil instantaneous acceleration; Grade is road grade; M is electronlmobil quality; S is that electronlmobil keeps out the wind area; C is electronlmobil rolling resistance;

4.2, according to driving parameters feature, vehicle driving-cycle is divided into accelerating mode, decelerating mode, at the uniform velocity four kinds of patterns such as operating mode, idling operation;

4.3, according to adding up under the different operating modes that obtain by generalized variable and corresponding power consumption second, using the method for statistical regression, setting up the final electric car electric energy rate of consumption model based on generalized variable.

The present invention is directed to actual running state of the vehicle, divide different vehicle driving-cycles.And based on considering the generalized variable of the power consumption influence factors such as traffic behavior, road grade, electronlmobil weight and formal parameter, establish the electric car electric energy rate of consumption model under different operating mode.Based on power consumption rate model, consider the impact that actual traffic state parameter consumes electric car electric energy, propose a kind of evaluation method of driving electronlmobil continual mileage, the power consumption feature of electronlmobil in following real road environment can be described more meticulously, more accurately estimate the continual mileage of electronlmobil, and then select rational traffic path, in time charging carried out to electronlmobil and provide guarantee for chaufeur.

Accompanying drawing explanation

When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:

Fig. 1 is the diagram of circuit of the electronlmobil continual mileage evaluation method that the present embodiment provides.

Fig. 2 is the diagram of circuit of the continual mileage calculating that the present embodiment provides.

Detailed description of the invention

With reference to Fig. 1-2, embodiments of the invention are described.

For enabling above-mentioned purpose, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

The electronlmobil continual mileage method of estimation that the present embodiment provides, its flow process as shown in Figure 1, comprises the following steps:

S1, the path obtaining planning according to the departure place of setting, destination and time of departure and the microcosmic traffic state (traffic behavior as in conjunction with traffic behavior historical data base and current traffic condition prediction this path planning following) in this path future, namely electronlmobil by speed V second, unit is m/s, by acceleration/accel a second, unit is m/s ²;

S2, based on obtain by second speed, acceleration/accel etc. calculates generalized variable (in this example for vehicle specific power (VSP)), this variable combines the factor that traffic behavior, road grade, battery-driven car weight and Windshield etc. affects electric car electric energy consumption;

$\begin{array}{c}\mathrm{VSP}=V\·[a+g\·\mathrm{grad}e+g\·C_R]+\frac{1}{2}{\mathrm{\ρ}}_{\mathrm{\σ}}\frac{C_D\·S}{m}{V}^3\\ =V\·(1.1\·a+0.132)+0.000302\·V^3\end{array}$

Wherein, V is electronlmobil momentary velocity, km/h; A is electronlmobil instantaneous acceleration, m/s ²; G is acceleration due to gravity, gets 9.81m/s ²; Grade is road grade, dimensionless; C _r---coefficient of rolling resistance, dimensionless, gets 0.0135; ρ _σfor density of air, when 20 DEG C, get 1.207kg/m ³; C _dfor air resistance coefficient, dimensionless; S is cross-sectional area before vehicle, m ²; M is car weight, kg, wherein (C _d× S)/m entirety is taken as 0.0005.

S3, be divided into different driving cycle from acceleration/accel (a) to by motoring condition according to speed (V), and generalized variable substituted into corresponding electric car electric energy rate of consumption model, calculate the power consumption e by second, unit is J/s;

Wherein, work as V>0, during a>0, motoring condition is accelerating mode, shown in model is specific as follows: e _ac=-62.96VSP ²+ 2271VSP+788.3;

Work as V>0, during a<0, motoring condition is decelerating mode, shown in model is specific as follows:

e _de＝0.007·VSP ⁵+0.554·VSP ⁴+15.05·VSP ³+173.2·VSP ²+747.2·VSP+2518；

Work as V>0, during a=0, motoring condition is at the uniform velocity operating mode, shown in model is specific as follows:

e _cr＝-10.80·VSP ²+2047·VSP+1052；

Work as V=0, during a=0, motoring condition is idling operation, shown in model is specific as follows:

e _id＝1439.73w。

The remaining capacity SOC of S4, acquisition present battery _r, according to SOC _rwith power consumption rate e, S5, obtain remaining mileage S through cycle calculations, unit is km.Calculation process as shown in Figure 2.S31, acquisition electronlmobil remaining capacity SOC _rwith current voltage U, the dump energy of the battery corresponding to calculating and make i=1;

S32, divide different time slices according to speed and acceleration/accel, make, in each time slice, there is same speed V _iwith acceleration/accel a _i;

S33, extract i-th time slice by generalized variable value second, calculate i-th time slice by energy consumption e second _i;

The power consumption E of S34, calculating i-th time slice _i=e _it _i, and the operating range S of this time slice _i=V _it _i;

The relation of the power consumption of the energy content of battery that S35, the upper time slice of judgement are remaining and this time slice, i.e. E _r ^i-1>E _iwhether set up, if set up, then pass through E _r ⁱ=E _r ^i-1-E _i, S=S+S _i, i=i+1, jumps to S33; If be false, then perform S37, continual mileage journey S=S+V _ie _r ^i-1/ e _i.

Wherein, in step S3, power consumption rate model is set up by the following method:

1) introduce generalized variable (in this example for vehicle specific power (VSP)), this variable combines the factor that traffic behavior, road grade, battery-driven car weight and Windshield etc. affect electric car electric energy consumption.

$\begin{array}{c}\mathrm{VSP}=V\&CenterDot;[a+g\&CenterDot;\mathrm{grad}e+g\&CenterDot;C_R]+\frac{1}{2}{\mathrm{\&rho;}}_{\mathrm{\&sigma;}}\frac{C_D\&CenterDot;S}{m}{V}^3\\ =V\&CenterDot;(1.1\&CenterDot;a+0.132)+0.000302\&CenterDot;V^3\end{array}$

Wherein, V is electronlmobil momentary velocity, km/h; A is electronlmobil instantaneous acceleration, m/s ²; G is acceleration due to gravity, gets 9.81m/s ²; Grade is road grade, dimensionless; C _r---coefficient of rolling resistance, dimensionless, gets 0.0135; ρ _σfor density of air, when 20 DEG C, get 1.207kg/m ³; C _dfor air resistance coefficient, dimensionless; S is cross-sectional area before vehicle, m ²; M is car weight, kg, wherein (C _d× S)/m entirety is taken as 0.0005.

2) based on the instantaneous electric automobile during traveling data obtained in advance, VSP (unit is kw/t) per second is calculated, in conjunction with corresponding power consumption rate basis of formation data bank per second.

3) based on different speed, acceleration/accel, vehicle traveling is divided into accelerating mode, decelerating mode, at the uniform velocity operating mode and idling operation.

4) obtain generalized variable under different operating mode and corresponding power consumption rate according to statistics, use regression model, determine the electric car electric energy rate of consumption model of final generalized variable, power consumption rate e, unit is J/s;

Accelerating mode: e _ac=-62.96VSP ²+ 2271VSP+788.3

Decelerating mode:

e _de＝0.007·VSP ⁵+0.554·VSP ⁴+15.05·VSP ³+173.2·VSP ²+747.2·VSP+2518

At the uniform velocity operating mode: e _cr=-10.80VSP ²+ 2047VSP+1052

Idling operation: e _id=1439.73w.

Although the foregoing describe the specific embodiment of the present invention, but those skilled in the art is to be understood that, these detailed description of the invention are only casehistorys, those skilled in the art, when not departing from principle of the present invention and essence, can carry out various omission, replacement and change to the details of said method and system.Such as, merge said method step, thus then belong to scope of the present invention according to the function that the method that essence is identical performs essence identical to realize the identical result of essence.Therefore, scope of the present invention is only defined by the appended claims.

Claims (2)

1. an electronlmobil continual mileage evaluation method, is characterized in that, comprises the following steps:

1.1, the path of planning and the microcosmic traffic state in this path future is obtained according to the departure place of setting, destination and time of departure;

1.2, based on obtain by second speed, the generalized variable of each time point in this path of acceleration calculation, this generalized variable is vehicle specific power VSP;

$\begin{array}{c}VSP=V\&CenterDot;\&lsqb;a+g\&CenterDot;grade+g\&CenterDot;C_R\&rsqb;+\frac{1}{2}{\mathrm{\&rho;}}_{\mathrm{\&sigma;}}\frac{C_D\&CenterDot;S}{m}{V}^3\\ =V\&CenterDot;(1.1\&CenterDot;a+0.132)+0.000302\&CenterDot;V^3\end{array}$

Wherein, V is electronlmobil momentary velocity, km/h; A is electronlmobil instantaneous acceleration, m/s ²; G is acceleration due to gravity, and grade is road grade, C _rfor coefficient of rolling resistance, ρ _σfor density of air, C _dfor air resistance coefficient, S is cross-sectional area before vehicle, and m is car weight;

1.3, choose the electric car electric energy rate of consumption model established according to different driving cycles, in conjunction with the generalized variable calculated, calculate the power consumption e by second;

Wherein, work as V>0, during a>0, motoring condition is accelerating mode,

Work as V>0, during a<0, motoring condition is decelerating mode,

$e_{de}=f(\underset{i=0}{\overset{n}{\&Sigma;}}{\mathrm{\&beta;}}_i\&CenterDot;{\mathrm{VSP}}^i);$

Work as V>0, during a=0, motoring condition is at the uniform velocity operating mode,

$e_{cr}=f(\underset{i=0}{\overset{n}{\&Sigma;}}{\mathrm{\&mu;}}_i\&CenterDot;{\mathrm{VSP}}^i);$

Work as V=0, during a=0, motoring condition is idling operation,

e _id＝ρ

1.4, the remaining capacity SOC of present battery is obtained _rwith current voltage U, according to SOC _rwith power consumption rate e, obtain remaining mileage S through cycle calculations, computation process is as follows:

S31, acquisition electronlmobil remaining capacity SOC _rwith current voltage U, the dump energy of the battery corresponding to calculating and make i=1;

S32, divide different time slices according to speed and acceleration/accel, make, in each time slice, there is same speed V _iwith acceleration/accel a _i;

S33, extract i-th time slice by generalized variable value second, calculate i-th time slice by energy consumption e second _i;

The power consumption E of S34, calculating i-th time slice _i=e _it _i, and the operating range S of this time slice _i=V _it _i;

The relation of the power consumption of the energy content of battery that S35, the upper time slice of judgement are remaining and this time slice, namely whether set up, if set up, then pass through s=S+S _i, i=i+1, jumps to S33; If be false, then continual mileage journey

2. electronlmobil continual mileage evaluation method according to claim 1, it is characterized in that, in described step 1.3, electric car electric energy rate of consumption model establishment step is as follows:

4.1, generalized variable is introduced, the synthesis that this generalized variable is traffic behavior, road grade, electronlmobil weight and formal parameter affect the parameter of electric energy; Based on speed, acceleration/accel, road grade, the weight of the electronlmobil obtained in advance by second, calculate generalized variable value per second and power consumption per second; A=f (V, a, grade, m, S, C), wherein, A is generalized variable; V is electronlmobil momentary velocity; A is electronlmobil instantaneous acceleration; Grade is road grade; M is electronlmobil quality; S is that electronlmobil keeps out the wind area; C is electronlmobil rolling resistance;

4.2, according to driving parameters feature, vehicle driving-cycle is divided into accelerating mode, decelerating mode, at the uniform velocity four kinds of patterns such as operating mode, idling operation;

4.3, according to adding up under the different operating modes that obtain by generalized variable and corresponding power consumption second, using the method for statistical regression, setting up the final electric car electric energy rate of consumption model based on generalized variable.