阅读说明：本技术 一种氢燃料电池混合动力新能源车续驶里程估算方法 (Method for estimating driving range of hydrogen fuel cell hybrid new energy vehicle ) 是由 李昌泉 郝义国 于 2019-08-08 设计创作，主要内容包括：本发明公开了一种氢燃料电池混合动力新能源车续驶里程估算方法。该方法包括如下步骤：S1：计算每个模块调用周期内耗能Q<Sub>1</Sub>,在一定时间段内耗能Q<Sub>sum</Sub>；其中,U：高压母线电压,单位：V；I：高压母线电流,单位：A；dt：模块调用周期,单位：s；S2：计算每个模块调用周期行驶距离S<Sub>1</Sub>,在一定时间段内行驶距离S<Sub>sum</Sub>；V：车辆速度,单位：km/h；S3：计算实时平均百公里能耗Q＝Q<Sub>sum</Sub>*100000/S<Sub>sum</Sub>；S4：获取所述新能源车的当前能源剩余量Q<Sub>S</Sub>为动力电池、超级电容和燃料电池可提供总能量；S5：计算续驶里程S＝(W<Sub>bat</Sub>+W<Sub>cap</Sub>+W<Sub>fcs</Sub>)/Q*100。本发明的估算方法,通过对动力电池、超级电容和燃料电池能量状态的实时监测,结合整车能源消耗率来估算整车续驶里程,可以有效解决用户里程焦虑问题。(the invention discloses a method for estimating the driving range of a hydrogen fuel cell hybrid new energy vehicle, which comprises the following steps of S1, calculating energy consumption Q 1 in each module calling period, and calculating the energy consumption Q sum in a certain time period, wherein U is the voltage of a high-voltage bus, V, I is the current of the high-voltage bus, A, dt is the module calling period, S2 is the driving distance S 1 of each module calling period, and the driving distance S sum in a certain time period, V is the speed of the vehicle, km/h, S3 is the real-time average hundred-kilometer energy consumption Q sum 100000/S sum , S4 is the current energy remaining amount Q S of the new energy vehicle, wherein the current energy remaining amount Q S can provide the total energy for a power battery, a super capacitor and a fuel cell, S5 is the driving range S which is calculated (W bat + W cap + W fcs )/Q100).)

1. a driving range estimation method for a hydrogen fuel cell hybrid new energy vehicle is characterized by comprising the following steps: the method comprises the following steps:

s1, calculating energy consumption Q ₁ in each module calling period, wherein in a certain time period, the energy consumption Q _sum is Q ₁ + Q ₂ + Q ₃ + · 9. + Q _n;

Q₁＝U*I*dt/3600000；

Wherein, U: high voltage bus voltage, unit: v; i: high voltage bus current, unit: a; dt: module calling period, unit: s;

S2, calculating a driving distance S ₁ of each module calling period, wherein the driving distance S _sum is S ₁ + S ₂ + S ₃ +. 9. + S _n in a certain time period;

s ₁ ═ V dt/3.6, V is vehicle speed, unit: km/h;

s3, calculating the real-time average hundred kilometer energy consumption Q (Q _sum) 100000/S _sum;

s4, acquiring the current energy remaining quantity Q _S of the new energy vehicle as W _bat + W _cap + W _fcs, wherein W _bat can provide total energy for the power battery, and W _cap can provide total energy for the super capacitor;

and S5, calculating the driving range S ═ W _bat + W _cap + W _fcs)/Q100.

2. the method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle according to claim 1, wherein: the power battery can provide total energy:

W_bat＝ΔSOC*P*T＝ΔSOC*U*I*T＝(SOC_actual-SOC_min)*U_rate*C_rate/1000；

The device comprises an SOC _min, an SOC _actual, a U _rate, a power battery rated voltage, a C _rate, a power battery rated capacity, and a W _bat, wherein the unit of the SOC _min is the minimum SOC allowed by the power battery to work, the unit of the SOC _actual is the unit of the power battery current SOC, the unit of the power battery rated voltage is V, the unit of the C _rate is Ah, and the unit of the W _bat is Kwh.

3. The method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle according to claim 2, wherein: the super capacitor can provide total energy:

W_cap＝(SOC′_actual-SOC′_min)*C′_rate*U′_rate*η/1000；

the control method comprises the following steps of obtaining a voltage value of a super capacitor, wherein the SOC '_min is the minimum SOC allowed by the super capacitor in unit percent, the SOC' _actual is the current SOC of the super capacitor in unit percent, the C '_rate is the rated capacity of the super capacitor in unit Ah, the U' _rate is the rated voltage of the super capacitor in unit V, and the eta is the rated efficiency of the bidirectional DCDC.

4. the method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle according to claim 3, wherein: the fuel cell can provide the total energy:

W_fcs＝(M_actual-M_min)*η*140.4/3.6

m _actual residual mass of hydrogen in kg

eta: fuel cell energy conversion efficiency:

m _min minimum hydrogen mass allowed for operation of the fuel cell in kg.

5. The method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle as claimed in claim 4, wherein the mass of the hydrogen gas is a strongly dependent function of the pressure, volume and temperature of the hydrogen gas, i.e. M _actual ═ f (p _actual, v, t).

6. The method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle as claimed in claim 1, wherein the average energy consumption is calculated once per kilometer, the energy consumption value of one hundred kilometers calculated at the moment is taken as the current energy consumption value Q of one hundred kilometers of the whole vehicle when the actual driving distance S _sum reaches 1km, and the calculation of the energy consumption value of one hundred kilometers within the next 1km is restarted through the steps S1, S2 and S3.

Technical Field

The invention relates to the technical field of hydrogen energy automobiles, in particular to a driving range estimation method of a hydrogen fuel cell hybrid new energy vehicle.

Background

With the continuous development of human society, the demand for energy is increasing. At present, fossil energy is also faced with the problem of resource failure as a first energy source, and the ecological environment of the earth is increasingly worsened, so that a new energy approach must be developed, and meanwhile, the characteristics of energy supply and little harm to the environment are achieved, and the concept of new energy is generated at the same time. The main new energy types at present are wind energy, solar energy, hydrogen energy and the like, while the hydrogen energy is known as ultimate energy due to the characteristics of high energy efficiency, renewability, little pollution and the like, and the future industrialization of the hydrogen energy has infinite imagination space and is also the new energy which is most suitable for being loaded on automobiles. However, since the layout of the hydrogen energy industry is still in the early stage at present, particularly, the number of the hydrogen refueling stations is very small, which causes the mileage anxiety of the user and worrys about that the driving range of the vehicle cannot be supported to the hydrogen refueling stations. At the moment, if the driving range of the vehicle can be displayed on the vehicle instrument in real time, the problem of anxiety of the user range can be solved well, and meanwhile, the user can make a better vehicle-using plan conveniently.

Disclosure of Invention

the invention aims to provide a method for estimating the driving range of a hydrogen fuel cell hybrid new energy vehicle, which is simple and accurate in calculation, aiming at the defects in the prior art.

The invention discloses a method for estimating the driving range of a hydrogen fuel cell hybrid new energy vehicle, which comprises the following steps of:

s1, calculating energy consumption Q ₁ in each module calling period, wherein in a certain time period, the energy consumption Q _sum is Q ₁ + Q ₂ + Q ₃ + · 9. + Q _n;

Q₁＝U*I*dt/3600000；

Wherein, U: high voltage bus voltage, unit: v; i: high voltage bus current, unit: a; dt: module calling period, unit: s;

S2, calculating a driving distance S ₁ of each module calling period, wherein the driving distance S _sum is S ₁ + S ₂ + S ₃ +. 9. + S _n in a certain time period;

S ₁ ═ V dt/3.6, V is vehicle speed, unit: km/h;

S3, calculating the real-time average hundred kilometer energy consumption Q (Q _sum) 100000/S _sum;

s4, acquiring the current energy remaining quantity Q _S of the new energy vehicle as W _bat + W _cap + W _fcs, wherein W _bat can provide total energy for the power battery, and W _cap can provide total energy for the super capacitor;

and S5, calculating the driving range S ═ W _bat + W _cap + W _fcs)/Q100.

preferably, the power battery can provide total energy:

W_bat＝ΔSOC*P*T＝ΔSOC*U*I*T＝(SOC_actual-SOC_min)*U_rate*C_rate/1000；

the device comprises an SOC _min, an SOC _actual, a U _rate, a power battery rated voltage, a C _rate, a power battery rated capacity, and a W _bat, wherein the unit of the SOC _min is the minimum SOC allowed by the power battery to work, the unit of the SOC _actual is the unit of the power battery current SOC, the unit of the power battery rated voltage is V, the unit of the C _rate is Ah, and the unit of the W _bat is Kwh.

Preferably, the super capacitor can provide the total energy:

W_cap＝(SOC′_actual-SOC′_min)*C′_rate*U′_rate*η/1000；

the control method comprises the following steps of obtaining a voltage value of a super capacitor, wherein the SOC '_min is the minimum SOC allowed by the super capacitor in unit percent, the SOC' _actual is the current SOC of the super capacitor in unit percent, the C '_rate is the rated capacity of the super capacitor in unit Ah, the U' _rate is the rated voltage of the super capacitor in unit V, and the eta is the rated efficiency of the bidirectional DCDC.

Preferably, the fuel cell provides a total energy:

W_fcs＝(M_actual-M_min)*η*140.4/3.6

M _actual residual mass of hydrogen in kg

eta: fuel cell energy conversion efficiency:

M _min minimum hydrogen mass allowed for operation of the fuel cell in kg.

Preferably, the hydrogen mass is a strongly dependent function of hydrogen pressure, volume and temperature, i.e., M _actual ═ f (p _actual, v, t).

Preferably, the average energy consumption is calculated once per kilometer, when the actual driving distance S _sum reaches 1km, the energy consumption value per kilometer calculated at this time is taken as the current energy consumption value per kilometer of the whole vehicle Q, and meanwhile, the calculation of the energy consumption value per kilometer within the next 1km is restarted through the steps S1, S2 and S3.

According to the method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle, the driving range of the whole vehicle is estimated by monitoring the energy states of the power cell, the super capacitor and the fuel cell in real time and combining the energy consumption rate of the whole vehicle, so that the problem of anxiety of the user range can be effectively solved.

Detailed Description

the following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

the invention discloses a method for estimating the driving range of a hydrogen fuel cell hybrid new energy vehicle, which comprises the following steps of:

s1, calculating energy consumption Q ₁ in each module calling period, wherein in a certain time period, the energy consumption Q _sum is Q ₁ + Q ₂ + Q ₃ + · 9. + Q _n;

Q₁＝U*I*dt/3600000；

Wherein, U: high voltage bus voltage, unit: v; i: high voltage bus current, unit: a; dt: module calling period, unit: s;

S2, calculating a driving distance S ₁ of each module calling period, wherein the driving distance S _sum is S ₁ + S ₂ + S ₃ +. 9. + S _n in a certain time period;

S ₁ ═ V dt/3.6, V is vehicle speed, unit: km/h;

S3, calculating the real-time average hundred kilometer energy consumption Q (Q _sum) 100000/S _sum;

s4, acquiring the current energy remaining quantity Q _S of the new energy vehicle as W _bat + W _cap + W _fcs, wherein W _bat can provide total energy for the power battery, and W _cap can provide total energy for the super capacitor;

And S5, calculating the driving range S ═ W _bat + W _cap + W _fcs)/Q100.

According to the method for estimating the driving range of the hydrogen fuel cell hybrid new energy vehicle, the driving range of the whole vehicle is estimated by monitoring the energy states of the power cell, the super capacitor and the fuel cell in real time and combining the energy consumption rate of the whole vehicle, so that the problem of anxiety of the user range can be effectively solved.

The module calling period may be: dt is 0.01S. n may be 20.

Calculating the total remaining available energy of the whole vehicle:

firstly, the total energy which can be provided by each energy providing unit (fuel cell, power cell and super capacitor) of the whole vehicle is calculated, and then the driving range of the whole vehicle is calculated according to the average energy consumption of the whole vehicle. Since the brake feedback energy is finally reflected in the increase of the energy of the power battery and the super capacitor, the brake feedback energy is not calculated additionally.

The power battery can provide total energy:

W_bat＝ΔSOC*P*T＝ΔSOC*U*I*T＝(SOC_actual-SOC_min)*U_rate*C_rate/1000；

the SOC _min is the minimum SOC allowed by the power battery to work in unit percent, the SOC _actual is the current SOC of the power battery in unit percent, the U _rate is the rated voltage of the power battery in unit V, the C _rate is the rated capacity of the power battery in unit Ah, the unit of W _bat is Kwh.

The super capacitor can provide total energy:

W_cap＝(SOC′_actual-SOC′_min)*C′_rate*U′_rate*η/1000；

the control method comprises the following steps of obtaining a voltage value of a super capacitor, wherein the SOC '_min is the minimum SOC allowed by the super capacitor in unit percent, the SOC' _actual is the current SOC of the super capacitor in unit percent, the C '_rate is the rated capacity of the super capacitor in unit Ah, the U' _rate is the rated voltage of the super capacitor in unit V, and the eta is the rated efficiency of the bidirectional DCDC.

The fuel cell can provide the total energy:

W_fcs＝(M_actual-M_min)*η*140.4/3.6

m _actual residual mass of hydrogen in kg

Eta: fuel cell energy conversion efficiency:

M _min minimum hydrogen mass allowed for operation of the fuel cell in kg.

the hydrogen mass is a strongly dependent function of hydrogen pressure, volume and temperature, i.e., M _actual ═ f (p _actual, v, t).

In addition, because the fuel cell generates electric energy through the chemical reaction of hydrogen and oxygen, the lowest pressure limit is provided for the intake pressure in the reaction process, so that the minimum hydrogen mass M _min ═ f (p _min, v, t) for the normal operation of the fuel cell can be obtained through a mass equation

Therefore, the available mass M of the hydrogen in real time is M _actual -M _min

Real-time calculation of energy available from hydrogen

the driving energy actually used for driving the vehicle is electric energy, so that the heat energy of the hydrogen needs to be converted into the electric energy. According to the experiment, the calorific value of hydrogen is 140.4MJ/kg, and 1kwh is 3.6MJ, and considering the conversion efficiency of the fuel cell, the energy provided by hydrogen is as follows:

W_fcs＝M*η*140.4/3.6

The method is characterized in that the energy consumption calculated in each module calling period is changed greatly due to the fact that the working condition of the whole vehicle changes rapidly, and the energy consumption calculated in each module calling period has no reference significance for reflecting the actual energy consumption state of the vehicle, therefore, a mode of calculating the average energy consumption once per kilometer and updating and displaying is adopted, the average energy consumption once per kilometer is calculated, when the actual driving distance S _sum reaches 1km, the energy consumption value of one hundred kilometers calculated at the moment is taken as the current energy consumption value Q of the whole vehicle within one hundred kilometers, and meanwhile, the energy consumption value of the next one hundred kilometer within 1km is calculated again through steps S1, S2 and S36.

In order to avoid frequent fluctuation of the energy consumption value of hundred kilometers, filtering can be performed on the energy consumption value of hundred kilometers, wherein the filtering method is average filtering, and the average value of nearly 20 times is taken as the final energy consumption value of hundred kilometers.

Storing the last hundred kilometers of energy consumption value into FLASH when powering off; and displaying the hundred-kilometer energy consumption value as the hundred-kilometer energy consumption value read from the FLASH during initial power-on, and subsequently displaying the actual calculated value.

the above is not relevant and is applicable to the prior art.

while certain specific embodiments of the present invention have been described in detail by way of illustration, it will be understood by those skilled in the art that the foregoing is illustrative only and is not limiting of the scope of the invention, as various modifications or additions may be made to the specific embodiments described and substituted in a similar manner by those skilled in the art without departing from the scope of the invention as defined in the appending claims. It should be understood by those skilled in the art that any modifications, equivalents, improvements and the like made to the above embodiments in accordance with the technical spirit of the present invention are included in the scope of the present invention.