CN112046486A - Fuel cell automobile output power correction method, system and storage medium - Google Patents
Fuel cell automobile output power correction method, system and storage medium Download PDFInfo
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- B60—VEHICLES IN GENERAL
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- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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Abstract
The invention discloses a method and a system for correcting output power of a fuel cell vehicle and a computer readable storage medium, belongs to the technical field of fuel cell vehicles, and solves the technical problem of low energy utilization efficiency in the prior art. A fuel cell vehicle output power correction method includes the following steps: acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal; determining the output power of the fuel battery and the power battery according to the vehicle running state, the real-time SOC signal of the power battery and the required power of the whole vehicle; and determining the power which is finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell. The method for correcting the output power of the fuel cell automobile improves the energy utilization efficiency of the fuel cell automobile.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to a method and a system for correcting output power of a fuel cell automobile and a computer readable storage medium.
Background
Energy agency reports that CO2The main emission source of the automobile is the transportation industry, accounts for 28 percent, and various automobile manufacturers seek solutions for reducing the automobile emission; hydrogen energy has been applied to the transportation industry in the last century, and the derived hydrogen fuel cell automobile has the characteristics of higher power conversion rate and almost zero emission, and has longer endurance mileage, less environmental pollution, shorter inflation/charging time and lower manufacturing cost compared with an electric vehicle, so the hydrogen fuel cell automobile is a feasible choice for replacing the electric vehicle.
The hydrogen fuel cell automobile generally comprises two power supplies, namely a fuel cell and a power cell, wherein the fuel cell ensures the driving range of the automobile, the power cell is used for quick power response and energy recovery, and the current power distribution strategy of the fuel cell has the problem of low energy utilization efficiency.
Disclosure of Invention
In view of this, the invention provides a method for correcting the output power of a fuel cell vehicle, which solves the technical problem of low energy utilization efficiency in the prior art.
In one aspect, the invention provides a method for correcting output power of a fuel cell vehicle, comprising the following steps:
acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
determining the output power of the fuel battery and the power battery according to the vehicle running state, the real-time SOC signal of the power battery and the required power of the whole vehicle;
and determining the power which is finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
Further, determining the output power of the fuel cell and the power cell according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle, wherein the method specifically comprises the following steps that if the vehicle is in a constant speed or acceleration running state, and the real-time SOC is smaller than a set minimum SOC threshold value, the maximum power of the fuel cell is used as the output power of the fuel cell; if the vehicle is in a constant speed or acceleration running state and the real-time SOC is greater than the set maximum SOC threshold value, the maximum power of the power battery is used as the output power of the power battery; and if the vehicle is in a constant speed or acceleration running state, the real-time SOC is greater than or equal to a set minimum SOC threshold value, and the real-time SOC is less than or equal to a set maximum SOC threshold value, determining the output power of the fuel cell and the power cell according to the real-time SOC, the target SOC of the power cell, the required power of the whole vehicle and the current working interval of the fuel cell.
Further, the method for correcting the output power of the fuel cell automobile further comprises the steps that when the maximum power of the fuel cell is used as the output power of the fuel cell, the output power of the power cell is 0, and the residual power obtained by subtracting the required power of the whole automobile from the output power of the fuel cell is used for charging the power cell; when the power battery takes the maximum power as the output power of the power battery, the fuel battery is shut down.
Further, determining the power finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell, wherein the specific steps include that if the maximum power of the fuel cell is used as the output power of the fuel cell, the power finally output to the power system by the fuel cell is the required power of the whole vehicle, the power finally output to the power system by the power cell is 0, if the maximum power of the power cell is used as the output power of the power cell, the power finally output to the power system by the fuel cell is 0, and the power finally output to the power system by the power cell is the maximum power of the power cell.
Further, the method for correcting the output power of the fuel cell automobile further comprises the steps of determining a low-power interval, a high-efficiency interval and a high-power interval of the fuel cell according to the curve relation between the efficiency and the power of the fuel cell, acquiring the current working interval of the fuel cell, and determining a power correction factor K according to whether the current working interval of the fuel cell is in the low-power interval, the high-efficiency interval or the high-power interval1According to factDetermining a power correction factor K according to the time SOC and the target SOC of the power battery2Correcting the power by a factor K1And a power correction factor K2And multiplying to obtain the total power correction factor K.
Further, according to the current working interval of the fuel cell, namely the low power interval, the high efficiency interval or the high power interval, the power correction factor K is determined1Specifically, the method includes that if the current working interval of the fuel cell is in the high-efficiency interval, the power correction factor K is used for correcting the current working interval1If the current operation interval of the fuel cell is in the low power interval, the power correction factor K is 11∈(1，f]If the current working interval of the fuel cell is in the high power interval, the power correction factor K1E [ g,1) in which f>1，0<g<1。
Further, determining a power correction factor K according to the real-time SOC and the target SOC of the power battery2Specifically, the method comprises the steps of setting a target SOC (system on chip), namely the SOC of the power batteryaimThe interval is [ a, b]Setting a real-time SOC (System on chip), i.e., SOCactHas an interval of [ c, d]If a is less than or equal to SOCactB is less than or equal to b, the power correction factor K2If c is equal to or less than SOC 1act<a, power correction factor K2∈(1，h]If b is<SOCactD is less than or equal to d, then the power correction factor, K2E [ i,1) in which a>c，d>b，h>1，0<i<1。
Further, determining the output power of the fuel cell and the power cell according to the real-time SOC, the target SOC of the power cell, the required power of the whole vehicle and the current working interval of the fuel cell, specifically, distributing the output power of the fuel cell according to the size of the real-time SOC, wherein the larger the real-time SOC is, the smaller the output power of the fuel cell is, taking the output power of the fuel cell distributed at the moment as the prepared output power, multiplying the prepared output power by the total power correction factor to obtain the output power of the fuel cell, and taking the output power of the fuel cell as the actual output power of the fuel cell if the output power of the fuel cell is smaller than the maximum power and larger than the minimum power; if the output power of the fuel cell is equal to or greater than the maximum power, taking the maximum power as the actual output power of the fuel cell; if the output power of the fuel cell is equal to or less than the minimum power, the minimum power is the actual output power of the fuel cell; and subtracting the actual output power of the fuel cell from the required power of the whole vehicle to obtain the output power of the power cell.
On the other hand, the invention also provides a fuel cell automobile output power correction system, which comprises a whole automobile controller, an output power acquisition module and an output power determination module;
the vehicle controller is used for acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
the output power acquisition module is used for determining the output power of the fuel cell and the power cell according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle;
and the output power determining module is used for determining the power finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
In another aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the method for correcting output power of a fuel cell vehicle according to any one of the above aspects.
Compared with the prior art, the invention has the beneficial effects that: acquiring a vehicle running state according to an accelerator pedal signal by acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal; determining the output power of the fuel battery and the power battery according to the vehicle running state, the real-time SOC signal of the power battery and the required power of the whole vehicle; determining the power which is finally output to a power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell; the energy utilization efficiency of the fuel cell automobile is improved.
Drawings
Fig. 1 is a schematic flow chart of a fuel cell vehicle output power correction method according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a method for correcting output power of a fuel cell vehicle according to embodiment 1 of the present invention;
fig. 3 is a sectional view of an operating region of a fuel cell according to embodiment 1 of the present invention;
FIG. 4 shows an input variable Δ H according to embodiment 1 of the present inventionSOCA membership function of;
FIG. 5 shows an output variable K according to embodiment 1 of the present invention2A membership function of;
FIG. 6 shows K in example 1 of the present invention2The fuzzy control result curve of (1);
FIG. 7 is a membership function of input variables of a fuel cell according to embodiment 1 of the present invention;
FIG. 8 is a membership function of an output variable of a fuel cell according to embodiment 1 of the present invention;
FIG. 9 shows K in example 1 of the present invention1The fuzzy control result curve of (1).
Reference numerals: 101-vehicle control unit; 102-a power distribution module; 103-a power correction module; 104-a fuzzy controller; 105-a DC/DC converter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment of the invention provides a method for correcting output power of a fuel cell vehicle, which has a flow schematic diagram, and as shown in fig. 1, the method comprises the following steps:
s1, acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
s2, determining the output power of the fuel cell and the power cell according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle;
and S3, determining the power which is finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
In a specific embodiment, as shown in fig. 2, the vehicle controller 101 receives working status signals from other components of the entire vehicle through the CAN bus, and determines which driving status the vehicle is in accelerating, uniform speed or braking, and the power P required by the entire vehiclereqThe power required by running and the power required by each electric device are included;
preferably, the output power of the fuel cell and the power cell is determined according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle, and the method specifically comprises the following steps that if the vehicle is in a constant speed or acceleration running state, and the real-time SOC is smaller than a set minimum SOC threshold value, the maximum power of the fuel cell is used as the output power of the fuel cell; if the vehicle is in a constant speed or acceleration running state and the real-time SOC is greater than the set maximum SOC threshold value, the maximum power of the power battery is used as the output power of the power battery; if the vehicle is in a constant speed or acceleration running state, the real-time SOC is greater than or equal to a set minimum SOC threshold value, and the real-time SOC is less than or equal to a set maximum SOC threshold value, determining the output power of the fuel cell and the power cell according to the real-time SOC, the target SOC of the power cell, the required power of the whole vehicle and the current working interval of the fuel cell;
in a specific embodiment, the calculation formula of the required power of the whole vehicle is Preq＝Pd+PeNamely, the power demand + the power consumption of the electric elements; the power demand can be calculated according to the theory of the automobile, and according to signals such as an accelerator pedal signal (converted into required acceleration) and a vehicle speed received by the vehicle controller, namely according to the following conditionsThe surface formula calculates the dynamic demand power (flat road surface),
ηtfor the mechanical efficiency of the transmission system, as a conversion factor for the rotating mass, m is the vehicle mass, f is the vehicle rolling resistance factor, CDThe parameters are determined according to specific vehicle or road air, v is vehicle speed, dv/dt is vehicle acceleration, and the parameters are determined by receiving signals transmitted from a VCU; the consumed power of the electrical components (vehicle parts) is the power required by electrical consumption on the automobile, such as the required power of a vehicle-mounted intelligent interaction system, vehicle-mounted light, a vehicle-mounted air conditioner and the like;
setting the minimum SOC threshold value of the power battery to be 30% and the maximum SOC threshold value to be 80%, distributing power for the fuel battery and the power battery, and switching the working modes as follows;
working mode one, when SOC<30% fuel cell with maximum power PmaxOutputting, wherein the power battery is in a charging state at the moment, the maximum output power of the fuel battery needs to meet the power requirement of the whole vehicle, the rest power is completely used for charging the power battery, and the charging power is Pcha＝Pmax-Preq；
And in a second working mode, when the SOC is more than or equal to 30% and less than or equal to 80%, the power battery and the fuel battery work simultaneously to meet the power requirement, the fuel battery outputs power in a power following state, when the SOC of the power battery is at a higher value, the power battery provides more output power, the fuel battery provides less output power, when the SOC is at a lower value, the opposite is true, and in the second working mode, the output power of the fuel battery is recorded as a prepared output power P0；
Under the state of uniform speed or acceleration driving, the vehicle controller 101 transmits a vehicle demand power signal and a real-time SOC signal of a power battery to the power distribution module 102, and the power distribution module 102 distributes power P according to the vehicle demand powerreqAnd SOC signal for determining power distribution of fuel cell vehicle, and recording the output power of fuel cell as prepared output power P in the working mode of supplying power by fuel cell and power cell together0(ii) a And the reserve power is corrected by power to obtain the final output power of the fuel cell.
In the third working mode, when the SOC is more than 80%, the fuel cell is closed, and the power cell is in a discharge state and outputs with the maximum output power;
preferably, the method for correcting the output power of the fuel cell vehicle further comprises the steps that when the maximum power of the fuel cell is used as the output power of the fuel cell vehicle, the output power of the power cell is 0, and the residual power obtained by subtracting the required power of the whole vehicle from the output power of the fuel cell is used for charging the power cell; when the power battery takes the maximum power as the output power of the power battery, the fuel battery is closed;
preferably, the power which is finally output to the power system by the fuel cell and the power cell is determined according to the output power of the fuel cell and the power cell, and the method specifically includes that if the maximum power of the fuel cell is used as the output power of the fuel cell, the power which is finally output to the power system by the fuel cell is the required power of the whole vehicle, the power which is finally output to the power system by the power cell is 0, if the maximum power of the power cell is used as the output power of the power cell, the power which is finally output to the power system by the fuel cell is 0, and the power which is finally output to the power system by the power cell is the maximum power of;
preferably, the method for correcting the output power of the fuel cell vehicle further includes determining a low power interval, a high efficiency interval and a high power interval of the fuel cell according to a curve relation between the efficiency and the power of the fuel cell, acquiring a current working interval of the fuel cell, and determining a power correction factor K according to whether the current working interval of the fuel cell is in the low power interval, the high efficiency interval or the high power interval1Determining a power correction factor K according to the real-time SOC and the target SOC of the power battery2Correcting the power by a factor K1And a power correction factor K2Multiplying to obtain a total power correction factor;
in one embodiment, according to the power-efficiency curve of the fuel cell, the efficiencies of 40% and 60% are taken as two dividing straight lines, wherein 40% is defined as the minimum efficiency working state of the fuel cell, namely the power interval of the fuel cell for starting to work needs to be satisfied above the minimum efficiency; the power interval with the efficiency of more than 60 percent is defined as the more ideal working interval of the fuel cell, namely a high-efficiency area; between 40% and 60% there are two regions, a low power region and a high power region; the two values of 40% and 60% are exemplary values, and different values can be defined according to the working efficiency curves and performances of different fuel cells in practical application;
a fuel cell operating interval division diagram, as shown in fig. 3, in order to operate the fuel cell in an interval with high efficiency, the minimum output power and the maximum output power of the fuel cell in three operating modes are set, the operating interval of the fuel cell is the operating interval of the fuel cell, the operating efficiency of the fuel cell in the operating interval is more than 40%, the operating interval is divided into a low power interval, a high power interval and a high efficiency interval, and the operating efficiency of the fuel cell in the high efficiency interval is more than 60%;
transmits the working interval signal of the fuel cell and the SOC signal of the power cell to two fuzzy controllers 104 and outputs two different power correction factors K1And K2To the power correction module 103, the fuel cell reserve output power P0The final power P is output after the power correction module 103 is correctedcell；
The vehicle control unit 101 transmits the operating range signal of the fuel cell to the fuzzy controller 104, and outputs a corresponding power correction factor K1The vehicle control unit 101 transmits an actual SOC signal, i.e., SOCactWhich is compared with a target SOC value, i.e. SOCaimDifference Δ H ofsocI.e. Δ Hsoc＝SOCact-SOCaimTo the fuzzy controller 104, the fuzzy controller 104 is responsive to Δ HsocOutputting corresponding power correction factor K2The power correction module 103 receives the fuel cell preliminary output power P0And two power correction factors, and calculating a total power correction factor K for correcting the preliminary output power of the fuel cell and outputting a final power PcellWherein K is K1·K2，Pcell＝P0K, calculated fuel cell final power PcellThe fuel cell is required to be in a working interval of the fuel cell, otherwise, upper and lower limit values are taken;
by introducing the fuzzy controller 104 and the correction factor, the fuel cell is divided into 3 working intervals according to the efficiency, the target working interval of the power cell is introduced, the difference value between the actual SOC and the target SOC of the cell is taken as the basis for power correction, and the distance between the fuel cell and the high-efficiency interval is taken as another correction basis, so that the working of the fuel cell is more close to the high-efficiency area, the efficiency is improved, the working of the power cell can be more deviated to the target SOC range, the efficiency of the cell is improved, and the service life of the cell is protected;
preferably, the power correction factor K is determined according to whether the current operation interval of the fuel cell is in a low power interval, a high efficiency interval or a high power interval1Specifically, the method includes that if the current working interval of the fuel cell is in the high-efficiency interval, the power correction factor K is used for correcting the current working interval1If the current operation interval of the fuel cell is in the low power interval, the power correction factor K is 11∈(1，f]If the current working interval of the fuel cell is in the high power interval, the power correction factor K1E [ g,1) in which f>1，0<g<1; f. the value of g may vary according to the actual situation;
in one embodiment, the power correction factor K is used when the fuel cell is operating in a high efficiency region 11 is ═ 1; when the fuel cell is operated in a low power region, the output power of the fuel cell needs to be increased properly to improve the efficiency, and the output power is corrected by a factor of 1<K1Less than or equal to 1.2, and when the output power of the fuel cell is PminWhen, K11.2; when the fuel cell works in a high-power interval, the output power of the fuel cell needs to be properly reduced to improve the efficiency, and the output power correction factor is more than or equal to 0.8 and less than or equal to K1<1, and when the fuel cell output is PmaxWhen, K1＝0.8；
Preferably, the power correction is determined according to the real-time SOC and the target SOC of the power batteryPositive factor K2Specifically, the method comprises the steps of setting a target SOC (system on chip), namely the SOC of the power batteryaimThe interval is [ a, b]Setting a real-time SOC (System on chip), i.e., SOCactHas an interval of [ c, d]If a is less than or equal to SOCactB is less than or equal to b, the power correction factor K2If c is equal to or less than SOC 1act<a, power correction factor K2∈(1，h]If b is<SOCactD is less than or equal to d, then the power correction factor, K2E [ i,1) in which a>c，d>b，h>1，0<i<1；
It should be noted that the values of a, b, c, d, i, and h may be changed according to actual situations;
in one embodiment, in order to make the power battery work in a more efficient region, the target SOC region of the power battery is set between 55% and 70%, and the actual SOC signal, i.e. SOC, is set in the second operation modeactThe working interval of (1) is between 30% and 80%, and when 55% is less than or equal to SOCactWhen the power is less than or equal to 70 percent, the power correction factor K 21 is ═ 1; when the actual SOC signal is out of the target interval, the output power of the fuel cell is corrected, so that the output power of the power cell is indirectly changed, and when the SOC is more than or equal to 30 percent, the output power of the power cell is correctedact<At 55%, the target SOC value is SOCaim＝55％，ΔHsoc＝SOCact-55%, the power correction factor 1 output at this time<K21.2 or less, and when Δ HsocValue K at minimum21.2; when the ratio is 70 percent<SOCactWhen the target SOC value is less than or equal to 80 percent, the target SOC value is the SOCaim＝70％，ΔHsoc＝SOCact70%, where the output power correction factor is 0.8 ≦ K2<1, and when Δ HsocMaximum time K20.8; actual SOC and power correction factor K2Table 1, as shown in table 1, table 1
Fuzzy controller input Δ HSOCOutput K2, Δ HSOCThe range is-0.25-0.1, the range of K2 is 0.8-1.2; input variable Δ HSOCAs shown in fig. 4; output variable K2Is subject toDegree function, as shown in FIG. 5; the fuzzy rule is If (Δ H)SOCis NB)then(K2is PB)，If(ΔHSOCis NS)then(K2is PS)，If(ΔHSOCis PS)then(K2is NS)，If(ΔHSOCis PB)then(K2is NB)，If(ΔHSOCis M)then(K2is M)；K2The fuzzy control result curve of (1) is shown in FIG. 6, and is shown by Δ H in FIG. 6SOC<0 time K2>1，ΔHSOC>0 time K2<1，ΔHSOCWhen equal to 0, K2＝1；
It should be noted that NB represents negative large, NS represents negative small, M represents medium, PS represents positive small, and PB represents positive large; regarding inputting a signal of a fuel cell working interval (namely the output power of the fuel cell), outputting a fuzzy controller of K1, and assuming that the power of a low-power area is 15KW-20KW, the power of a high-efficiency area is 20KW-30KW and the power of a high-power area is 30KW-35 KW; membership function for input variable of fuel cell as shown in FIG. 7, membership function for output variable of fuel cell as shown in FIG. 8, fuzzy rule is If (output power P is NB) then (K)1is PB), If (fuel cell output power P is M) then (K)1is M), If (fuel cell output power P is PB) then (K)1is NB), If (fuel cell output power P is NS) then (K)1is PS), If (fuel cell output power P is PS) then (K)1is NS)，K1The fuzzy control result curve of (1) is shown in FIG. 9. As can be seen from FIG. 9, the output K1 of the low power region (15KW-20KW) is shown>1, high efficiency region (20KW-30KW) output K1 is 1, high power region (30KW-35KW) output K1<1；
Preferably, the output powers of the fuel cell and the power cell are determined according to the real-time SOC, the target SOC of the power cell, the required power of the whole vehicle and the current working interval of the fuel cell, and specifically, the output power of the fuel cell is distributed according to the size of the real-time SOC, the larger the real-time SOC is, the smaller the output power of the fuel cell is, the output power of the fuel cell distributed at this time is taken as a preliminary output power, the preliminary output power is multiplied by a total power correction factor to obtain the output power of the fuel cell, and if the output power of the fuel cell is smaller than the maximum power and larger than the minimum power, the output power of the fuel cell is taken as the actual output power of the fuel cell; if the output power of the fuel cell is equal to or greater than the maximum power, taking the maximum power as the actual output power of the fuel cell; if the output power of the fuel cell is equal to or less than the minimum power, the minimum power is the actual output power of the fuel cell; subtracting the actual output power of the fuel cell from the required power of the whole vehicle to obtain the output power of the power cell;
in this case, the determined actual output power of the fuel cell and the determined output power of the power cell are the same as the respective powers output to the power system by the fuel cell and the power cell; final output power P of fuel cellcellThe power is boosted by a DC/DC converter 105 and then output to a fuel cell automobile power system, and the power of a power cell is directly output to the power system without conversion; the power battery provides the residual power of the power demand of the whole vehicle, namely Pbat＝Preq-Pcell。
Example 2
The embodiment of the invention provides a fuel cell automobile output power correction system, which comprises a whole automobile controller, an output power acquisition module and an output power determination module;
the vehicle controller is used for acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
the output power acquisition module is used for determining the output power of the fuel cell and the power cell according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle;
and the output power determining module is used for determining the power finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
Example 3
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the fuel cell vehicle output power correction method according to embodiment 1.
The invention discloses a method and a system for correcting output power of a fuel cell vehicle and a computer readable storage medium, wherein a vehicle running state and the required power of the whole vehicle are obtained by obtaining a driver signal, a vehicle component signal and a real-time SOC signal of a power battery according to the driver signal and the vehicle component signal; determining the output power of the fuel battery and the power battery according to the vehicle running state, the real-time SOC signal of the power battery and the required power of the whole vehicle; determining the power which is finally output to a power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell; the energy utilization efficiency of the fuel cell automobile is improved;
according to the technical scheme, when the fuel cell and the power cell supply power together, the output power of the fuel cell is corrected according to the working interval of the fuel cell and the SOC state of the cell, and energy distribution is optimized, so that the power requirement of the whole vehicle is better met and the endurance mileage is improved.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A fuel cell vehicle output power correction method is characterized by comprising the following steps:
acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
determining the output power of the fuel battery and the power battery according to the vehicle running state, the real-time SOC signal of the power battery and the required power of the whole vehicle;
and determining the power which is finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
2. The method for correcting the output power of the fuel cell automobile according to claim 1, wherein the output powers of the fuel cell and the power cell are determined according to the running state of the automobile, the real-time SOC signal of the power cell and the power demand of the whole automobile, and specifically comprises that if the automobile is in a constant speed or acceleration running state and the real-time SOC is smaller than a set minimum SOC threshold value, the maximum power of the fuel cell is used as the output power of the fuel cell; if the vehicle is in a constant speed or acceleration running state and the real-time SOC is greater than the set maximum SOC threshold value, the maximum power of the power battery is used as the output power of the power battery; and if the vehicle is in a constant speed or acceleration running state, the real-time SOC is greater than or equal to a set minimum SOC threshold value, and the real-time SOC is less than or equal to a set maximum SOC threshold value, determining the output power of the fuel cell and the power cell according to the real-time SOC, the target SOC of the power cell, the required power of the whole vehicle and the current working interval of the fuel cell.
3. The method for correcting the output power of the fuel cell vehicle according to claim 2, further comprising the step of subtracting the remaining power of the vehicle required power from the output power of the fuel cell when the maximum power of the fuel cell is used as the output power of the power cell, wherein the output power of the power cell is 0, and the remaining power is used for charging the power cell; when the power battery takes the maximum power as the output power of the power battery, the fuel battery is shut down.
4. The method for correcting the output power of the fuel cell vehicle as claimed in claim 3, wherein the final output power of the fuel cell and the power cell to the power system is determined according to the output power of the fuel cell and the power cell, and specifically includes that if the maximum power of the fuel cell is used as the output power of the fuel cell, the final output power of the fuel cell to the power system is the required power of the whole vehicle, the final output power of the power cell to the power system is 0, if the maximum power of the power cell is used as the output power of the power cell, the final output power of the fuel cell to the power system is 0, and the final output power of the power cell to the power system is the maximum power.
5. The method according to claim 2, further comprising determining a low power region, a high efficiency region and a high power region of the fuel cell according to a curve relationship between the efficiency and the power of the fuel cell, obtaining a current operating region of the fuel cell, and determining a power correction factor K according to whether the current operating region of the fuel cell is in the low power region, the high efficiency region or the high power region1Determining a power correction factor K according to the real-time SOC and the target SOC of the power battery2Correcting the power by a factor K1And a power correction factor K2And multiplying to obtain the total power correction factor K.
6. The fuel cell vehicle output power correction method according to claim 5, wherein the power correction factor K is determined according to whether the current operation interval of the fuel cell is in a low power interval, a high efficiency interval, or a high power interval1Specifically, the method includes that if the current working interval of the fuel cell is in the high-efficiency interval, the power correction factor K is used for correcting the current working interval1If the current operation interval of the fuel cell is in the low power interval, the power correction factor K is 11∈(1，f]If the current working interval of the fuel cell is in the high power interval, the power correction factor K1E [ g,1) in which f>1，0<g<1。
7. The fuel cell vehicle output power correction method as defined in claim 5, wherein the power correction factor K is determined based on the real-time SOC and the target SOC of the power cell2Specifically, the method comprises the steps of setting a target SOC (system on chip), namely the SOC of the power batteryaimThe interval is [ a, b]Setting a real-time SOC (System on chip), i.e., SOCactHas an interval of [ c, d]If a is less than or equal to SOCactB is less than or equal to b, the power correction factor K2If c is equal to or less than SOC 1act<a, power correction factor K2∈(1，h]If b is<SOCactD is less than or equal to d, then the power correction factor, K2E [ i,1) in which a>c，d>b，h>1，0<i<1。
8. The output power correction method of the fuel cell automobile according to claim 5, wherein the output powers of the fuel cell and the power cell are determined according to the real-time SOC, the target SOC of the power cell, the required power of the entire automobile and the current operating interval of the fuel cell, and specifically includes allocating the output power of the fuel cell according to the magnitude of the real-time SOC, wherein the larger the real-time SOC is, the smaller the output power of the fuel cell is, taking the output power of the fuel cell allocated at that time as the preliminary output power, multiplying the preliminary output power by the total power correction factor to obtain the output power of the fuel cell, and taking the output power of the fuel cell as the actual output power of the fuel cell if the output power of the fuel cell is smaller than the maximum power and larger than the minimum power; if the output power of the fuel cell is equal to or greater than the maximum power, taking the maximum power as the actual output power of the fuel cell; if the output power of the fuel cell is equal to or less than the minimum power, the minimum power is the actual output power of the fuel cell; and subtracting the actual output power of the fuel cell from the required power of the whole vehicle to obtain the output power of the power cell.
9. The output power correction system of the fuel cell automobile is characterized by comprising a whole automobile controller, an output power acquisition module and an output power determination module;
the vehicle controller is used for acquiring an accelerator pedal signal, a vehicle speed signal, a vehicle component signal and a real-time SOC signal of a power battery, acquiring a vehicle running state according to the accelerator pedal signal, and acquiring the required power of the whole vehicle according to the vehicle speed signal and the vehicle component signal;
the output power acquisition module is used for determining the output power of the fuel cell and the power cell according to the vehicle running state, the real-time SOC signal of the power cell and the required power of the whole vehicle;
and the output power determining module is used for determining the power finally output to the power system by the fuel cell and the power cell according to the output power of the fuel cell and the power cell.
10. A computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the fuel cell vehicle output power correction method according to any one of claims 1 to 8.
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