CN111959349A - Power distribution method and device of hybrid vehicle and vehicle - Google Patents
Power distribution method and device of hybrid vehicle and vehicle Download PDFInfo
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- CN111959349A CN111959349A CN202010779987.7A CN202010779987A CN111959349A CN 111959349 A CN111959349 A CN 111959349A CN 202010779987 A CN202010779987 A CN 202010779987A CN 111959349 A CN111959349 A CN 111959349A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The disclosure relates to a power distribution method and device of a hybrid vehicle and the vehicle, belonging to the field of hybrid vehicles, wherein the method comprises the following steps: and under the condition that the residual electric quantity is in a preset electric quantity range, distributing the output power of the power battery and the fuel battery according to the required power of the whole vehicle, so that the residual electric quantity of the power battery approaches to an expected electric quantity value in the preset electric quantity range. The power distribution method provided by the embodiment of the disclosure can reduce the frequency of overcharge or overdischarge of the power battery, prolong the service life of the power battery and enable the power distribution to be more reasonable.
Description
Technical Field
The present disclosure relates to the field of hybrid vehicles, and in particular, to a power distribution method and apparatus for a hybrid vehicle, and a vehicle.
Background
In a related hybrid system composed of a fuel cell and a power cell, the power demand of a vehicle and the state of charge (SOC) of the power cell are two main criteria in energy distribution. In other words, after the electric signals converted from the stroke amounts of the accelerator pedal and the brake pedal are input to a Power Control Unit (PCU), the PCU calculates the torque and the required power P of the vehicle under the current working condition, and accordingly, the power distribution of the whole vehicle is optimized, the output energy of the fuel cell and the power cell is provided to the driving motor, and the motor converts the electric energy into the kinetic energy, so that the vehicle is driven to run.
The most common in the related art is the switch mode, which is a control mode targeting the maximum driving range, and the PCU controls the turning off and on of the fuel cell system by comparing the power battery SOC value with a set limit SOC value. When the SOC value of the power battery is larger than the lower limit value of the residual electric quantity of the power battery set by the battery management system, the power battery continuously discharges, and if the required power P of the whole vehicle is larger than the maximum power which can be provided by the power battery, the fuel battery is started to provide energy for the running of the vehicle; and when the SOC value of the power battery is smaller than the lower limit value of the residual electric quantity of the power battery set by the battery management system, the power battery is closed, and the fuel battery is opened and charges the power battery.
However, the related art is prone to cause the power battery to be overcharged or overdischarged, which affects the service life of the power battery.
Disclosure of Invention
The invention aims to provide a power distribution method and device of a hybrid vehicle and the vehicle, and aims to solve the problem that the service life of a power battery is influenced due to the fact that the power battery is over-charged or over-discharged easily in the prior art.
In order to achieve the above object, the present disclosure provides a power distribution method of a hybrid vehicle including a fuel cell and a power cell, the method including:
acquiring the residual electric quantity of a power battery and the required power of the whole hybrid power vehicle;
and under the condition that the residual electric quantity is within a preset electric quantity range, distributing the output power of the power battery and the fuel battery according to the required power of the whole vehicle, so that the residual electric quantity of the power battery approaches to an expected electric quantity value within the preset electric quantity range.
Optionally, the method allocates output power of the power battery and the fuel battery according to the power required by the whole vehicle when the remaining capacity is within the preset capacity range, and includes:
the residual capacity is in the preset capacity range and is greater than under the condition of the expected capacity value, if the vehicle demand power is less than the sum of the expected power of the power battery under the residual capacity and the maximum output power of the fuel battery, the power battery is preferentially controlled to provide the output power which is in accordance with the vehicle demand power, and the output power is not greater than the expected power, wherein the power battery is in the expected power under the residual capacity and the residual capacity are positively correlated.
Optionally, the method further includes, when the remaining power is in a preset power range, allocating output power of the power battery and output power of the fuel battery according to the power demanded by the entire vehicle, including:
and under the condition that the residual electric quantity is in a preset electric quantity range and is smaller than an expected electric quantity value, if the required power of the whole vehicle is smaller than the maximum output power of the fuel cell, controlling the fuel cell to provide output power meeting the required power of the whole vehicle and charging power of the power cell.
Optionally, the method further includes, when the remaining power amount is within a preset power amount range, if the vehicle demand power is greater than the expected power of the power battery under the remaining power amount and smaller than the maximum output power of the fuel battery, controlling the power battery to output the expected power and controlling the fuel battery to output a difference power, where a value of the difference power is equal to a difference between the vehicle demand power and the expected power, and the expected power of the power battery under the remaining power amount is positively correlated with the remaining power amount.
Optionally, in the case that the remaining power is smaller than the lower limit of the preset power range, if the vehicle demand power is smaller than the high-efficiency point output power of the fuel cell, the method controls the fuel cell to provide the output power meeting the vehicle demand power and the charging power for the power cell;
and under the condition that the residual capacity is larger than the upper limit value of the preset capacity range, if the required power of the whole vehicle is larger than the expected power of the power battery under the residual capacity, controlling the power battery to output the maximum output power, wherein the expected power of the power battery under the residual capacity is positively correlated with the residual capacity.
Optionally, the expected power of the power battery under the remaining capacity is calculated by the following formula:
pbal is Pmax (SOC-SOCpre) 2/(SOCmax-SOCmin), where Pbal is the desired power, Pmax is the maximum charge-discharge power of the power battery, SOC represents the remaining power of the power battery, SOCmax represents the upper limit value of the remaining power of the power battery, and SOCmin represents the lower limit value of the remaining power of the power battery.
Optionally, the method further includes controlling the power battery to recover energy fed back by the hybrid vehicle if the power demand of the entire vehicle is a negative value when the remaining capacity is smaller than an upper limit value of the preset capacity range, wherein the recovered power of the power battery is not greater than the maximum output power of the power battery.
The present disclosure also provides a power distribution apparatus of a hybrid vehicle, the hybrid vehicle including a fuel cell and a power cell, the power distribution apparatus including:
the acquisition module is used for acquiring the residual electric quantity of the power battery and the total vehicle required power of the hybrid vehicle;
the processing module is used for processing and analyzing the relation between the residual electric quantity and the required power of the whole vehicle under the condition that the residual electric quantity of the power battery is in a preset electric quantity range to obtain an analysis result;
and the control module controls the switches and the working powers of the power battery and the fuel battery according to the analysis result, so that the residual electric quantity of the power battery approaches to an expected electric quantity value in the preset electric quantity range.
Optionally, the control module is specifically configured to:
the analysis result represents that the whole vehicle required power is greater than the power battery is in the expected power under the residual capacity and is less than the maximum output power of the fuel battery, the power battery is controlled to output the expected power and control the fuel battery outputs the difference power, the value of the difference power is equal to the difference between the whole vehicle required power and the expected power, wherein the expected power under the residual capacity of the power battery is positively correlated with the residual capacity.
The present disclosure also provides a hybrid vehicle including a fuel cell, a power cell, and a power distribution apparatus connected to the fuel cell and the power cell for performing a power distribution method of the hybrid vehicle.
Through the technical scheme, the following effects can be at least achieved:
compared with the prior art, the electric quantity of the power battery returns to the range of the preset electric quantity only under the condition that the residual electric quantity of the power battery exceeds the range of the preset electric quantity by controlling the switch and the power of the fuel battery.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of power distribution for a hybrid vehicle according to an exemplary embodiment.
FIG. 2 is a flow chart illustrating another method of power distribution for a hybrid vehicle according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating a method of power distribution for yet another hybrid vehicle according to an exemplary embodiment.
Fig. 4 is a block diagram showing the structure of a power distribution apparatus of a hybrid vehicle according to an example embodiment.
FIG. 5 is a block diagram illustrating a vehicle according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In order to enable those skilled in the art to quickly understand the improvement of the technical solution provided by the embodiments of the present disclosure compared with the prior art, the following first describes the switching mode for power distribution of the fuel cell and the power cell in the hybrid vehicle in the related art.
The switch mode is a control mode aiming at the maximum driving range, and the PCU controls the fuel cell and the power cell to be turned off and on to supply power to the vehicle by comparing the power cell SOC value with a set limit SOC value. The basic strategy of the switch control is shown in the following table 1, wherein P represents the required power of the whole vehicle, Pmax represents the maximum power which can be provided by the power battery, SOCmin represents the lower limit value of the residual capacity of the power battery set by the battery management system, and SOCmax represents the upper limit value of the residual capacity of the power battery set by the battery management system.
TABLE 1
As can be seen from table 1 above, the fuel cell is always turned off when the remaining power of the power cell is between SOCmin and SOCmax and the power required by the entire vehicle is less than the maximum power Pmax of the power cell. Therefore, the fuel cell cannot charge the power battery under the condition, and the maximum power Pmax of the power battery is used as a reference in the judgment condition of the required power of the whole vehicle, so that the frequency that the residual capacity of the power battery exceeds the SOCmax and the frequency that the residual capacity is smaller than the SOCmin is too high, namely the switching mode easily causes the situation that the power battery is over-charged or over-discharged.
In order to solve the above technical problem, an embodiment of the present disclosure provides a power distribution method for a hybrid vehicle, which may be applied to, for example, a PCU of the hybrid vehicle, as shown in fig. 1, and includes:
and S11, acquiring the residual capacity of the power battery and the total vehicle required power of the hybrid vehicle.
The required power of the whole vehicle can comprise required driving power and required power of electric accessories, wherein the required driving power can be the required driving power of the vehicle under the current working condition, which is obtained by converting the acquired stroke quantities of an accelerator pedal and a brake pedal into electric signals through the whole vehicle controller and calculating according to the electric signals; the power demand of the powered accessories may be determined by the vehicle control unit based on the operating state of the various powered accessories on the vehicle.
And S12, distributing the output power of the power battery and the fuel battery according to the vehicle required power under the condition that the residual electric quantity is in a preset electric quantity range, so that the residual electric quantity of the power battery approaches to an expected electric quantity value in the preset electric quantity range.
That is to say, the technical scheme of this disclosure embodiment still sets up the expectation electric quantity value that lies in this preset electric quantity scope for the preset electric quantity scope of power battery. Therefore, under the condition that the residual electric quantity of the power battery is smaller than the lower limit value of the expected electric quantity value and larger than the preset electric quantity range, the fuel battery can be started and the power battery is charged (whether the fuel battery is started or not can be judged according to the required power of the whole vehicle during specific implementation), so that the residual electric quantity of the power battery approaches to the expected electric quantity value, the residual electric quantity of the power battery can be maintained in the preset electric quantity range for a longer time, the condition that the power battery is overcharged or overdischarged is reduced, and the influence on the service life of the power battery is reduced.
In order to make those skilled in the art understand the power distribution method provided by the embodiments of the present disclosure, the following detailed description of the power distribution method of the embodiments of the present disclosure for the fuel cell and the power cell is provided:
fig. 2 is another flowchart of a power allocation method provided in an embodiment of the present disclosure, and as shown in the drawing, the method includes:
and S21, acquiring the residual capacity of the power battery and the total vehicle required power of the hybrid vehicle.
And S22, if the power demand is smaller than the sum of the expected power of the power battery under the residual capacity and the maximum output power of the fuel battery, preferentially controlling the power battery to provide the output power which is in accordance with the power demand of the whole vehicle, and the output power is not larger than the expected power.
The expected power of the power battery under the residual capacity is positively correlated with the residual capacity, and the expected capacity value is between the upper limit value and the lower limit value of the preset capacity range. In specific implementation, the expected power may be set according to the actual demand of the user, for example, the expected power of the power battery under the remaining capacity is calculated by the following formula:
Pbal＝Pmax*(SOC-SOCpre)*2/(SOCmax-SOCmin)
wherein, Pbal is the expected power, Pmax is the maximum charge-discharge power of the power battery, SOC represents the remaining capacity of the power battery, SOCmax represents the upper limit value of the remaining capacity of the power battery, and SOCmin represents the lower limit value of the remaining capacity of the power battery.
For another example, the desired power may be a preset fixed power value, which is not limited by this disclosure.
And S23, under the condition that the residual electric quantity is in a preset electric quantity range and is smaller than an expected electric quantity value, if the required power of the whole vehicle is smaller than the maximum output power of the fuel cell, controlling the fuel cell to provide the output power meeting the required power of the whole vehicle and the charging power of the power cell.
By adopting the method, under the condition that the residual electric quantity of the power battery is in the preset electric quantity range and is larger than the expected electric quantity value, and the required power of the whole vehicle is smaller than the sum of the expected power of the power battery under the residual electric quantity and the maximum output power of the fuel battery, the power battery can output with the expected power, the condition that the power battery generates over-discharge under the condition is avoided, in addition, under the condition that the residual electric quantity of the power battery is in the preset electric quantity range and is smaller than the expected electric quantity value, and the required power of the whole vehicle is smaller than the maximum output power of the fuel battery, the fuel battery can be controlled to be started for providing the output power meeting the required power of the whole vehicle and charging the power battery, the condition that the power battery generates over-discharge under the condition is avoided, and the service life of.
In another possible implementation manner, under the condition that the remaining capacity of the power battery is within the preset capacity range, if the required power of the whole vehicle is greater than the expected power of the power battery under the remaining capacity and smaller than the maximum output power of the fuel battery, the power battery is controlled to output the expected power, and the fuel battery is controlled to output a difference power, wherein the value of the difference power is equal to the difference between the required power of the whole vehicle and the expected power. Therefore, the frequency of the power battery outputting with the maximum output power of the power battery is reduced, the frequency of the fuel battery working in a high-efficiency area is increased, and the reasonability of energy distribution is improved.
Optionally, on the basis of the method shown in fig. 1, the power allocation method provided in the embodiment of the present disclosure may further include:
and under the condition that the residual electric quantity of the power battery is smaller than the lower limit value of the preset electric quantity range, if the required power of the whole vehicle is smaller than the high-efficiency point output power of the fuel battery, controlling the fuel battery to provide the output power meeting the required power of the whole vehicle and the charging power of the power battery. At this time, the fuel cell outputs power at a constant high efficiency point, thereby increasing the frequency of the fuel cell operating in the high efficiency region and further improving the rationality of energy distribution.
Optionally, under the condition that the remaining capacity of the power battery is greater than the upper limit value of the preset capacity range, if the required power of the entire vehicle is greater than the expected power of the power battery under the remaining capacity, the power battery is controlled to output the maximum output power.
It should be understood by those skilled in the art that the power demand of the entire vehicle in the above method embodiments is illustrated by taking a positive value as an example, where the positive value indicates that the vehicle needs the power source (power battery and fuel battery) to output power outwards, and the negative value indicates that the vehicle generates energy that needs to be recovered by the power battery. Based on this, the method provided by the embodiment of the present disclosure may further include: and under the condition that the residual electric quantity of the power battery is smaller than the upper limit value of the preset electric quantity range, if the required power of the whole vehicle is a negative value, controlling the power battery to recover the energy fed back by the hybrid vehicle, wherein the recovered power of the power battery is not larger than the maximum output power of the power battery.
Fig. 3 is a flowchart of another power distribution method provided in the embodiment of the present disclosure, where Pq in the diagram is a required power of a whole vehicle; pbat is the actual charge-discharge power of the power battery; pbat _ max is the maximum charge-discharge power of the power battery; the SOCmax is the upper limit value of the preset electric quantity range of the power battery; SOCmin is a lower limit value of the residual electric quantity of the power battery; pfc is the actual output power of the fuel cell; pfc _ max is the maximum output power of the fuel cell; pfc _ min is the minimum output power of the fuel cell; pfc _ eff is the fuel cell high efficiency point output power; pbal is the desired power of the power battery at the current remaining capacity. SOCpre is the desired charge value of the power cell, wherein SOCpre is between SOCmax and SOCmin, and in one possible embodiment, SOCpre ═ SOCmin + SOCmax)/2.
As shown in fig. 3, the PCU can allocate the power of the power battery and the fuel cell based on the magnitude of the value of the vehicle required power Pq after determining the vehicle required power Pq and the magnitude relationship between the power battery remaining capacity SOC and SOCmax, SOCmin and SOCpre. With specific reference to steps S301, S302, S303, S304, S305, S306 and S307, in the case that the remaining power of the power battery is between SOCmin and SOCpre, if the required power Pq of the entire vehicle is less than the maximum output power Pfc _ max of the fuel battery, the fuel battery provides the charging of Pbal for the power battery and the output power Pq of the entire vehicle, and the power battery outputs the power Pq — Pfc only when Pq < Pfc _ max.
Referring to steps S301, S302, S303, S304, S308, S309, S310, S311, S312, and S316, when the remaining capacity of the power battery is in the case where SOCpre < SOC < SOCmax, the power battery is preferentially controlled to provide the output power that meets the required power Pq of the entire vehicle and is not greater than Pbal when the vehicle is running, and the power battery is output with the output power Pq-Pfc only when Pq is greater than Pbal + Pfc _ max, wherein the desired power of the power battery in the remaining capacity is positively correlated with the remaining capacity. According to the scheme, the power consumption of the power battery in the preset electric quantity range is reduced, and the duration that the residual electric quantity of the power battery is maintained in the preset electric quantity range is prolonged on the premise that the vehicle performance is guaranteed.
Referring to steps S301, S302, S303, S317, S318, and S319, it can be seen that when the remaining capacity of the power battery is smaller than the lower limit value of the preset capacity range, that is, the SOC is less than SOCmin, the fuel battery provides the output power meeting the required power of the entire vehicle and the charging power for the power battery, and if the required power Pq of the entire vehicle is smaller than the high-efficiency point output power Pfc _ eff of the fuel battery, the power battery is charged with the power of Pfc _ eff-Pq. And if the required power of the whole vehicle is greater than the high-efficiency point output power of the fuel cell, the power cell is charged with the expected power of the current electric quantity. Through the power distribution scheme, the fuel cell can be positioned at a high-efficiency working point as much as possible, the utilization efficiency of fuel is improved, and energy distribution is carried out more reasonably.
Referring to steps S301, S302, S303, S304, S308, S313, S314, S315, S316 and 312, it can be seen that in the case where the remaining capacity SOC of the power battery is greater than SOCmax, the power battery is preferentially controlled to provide the output power that meets the required power of the entire vehicle, and the output power is not greater than the desired power Pbal, and the output power Pbat _ max is only in the case where Pq is greater than Pbal + Pfc _ max. According to the scheme, the power consumption of the power battery when the power battery is larger than the upper limit of the preset electric quantity range is increased, and the duration that the residual electric quantity of the power battery is maintained in the non-preset electric quantity range is reduced on the premise that the vehicle performance is guaranteed. The S314 condition may be Pq > Pbal + Pfc _ max, where the power battery tends to the desired power of the power battery rather than supplying the required power of the entire vehicle, and may be specifically set according to the actual demand.
Referring to steps S301, S302, S320, S321, S322, S323, and S324, in a case that the remaining power of the power battery is smaller than the upper limit of the preset power range, if the requested power Pq of the entire vehicle is less than 0, the power battery is controlled to recover the energy fed back by the hybrid vehicle, wherein the recovered power of the power battery is not greater than the maximum output power of the power battery.
Based on the same inventive concept, the disclosed embodiment further provides a power distribution apparatus 40 of a hybrid vehicle, for performing the steps of the power distribution method provided by the above method embodiment, where the power distribution apparatus 40 may implement PCU on the hybrid vehicle in a manner of software, hardware or a combination of both, as shown in fig. 4, and the power distribution apparatus 40 includes:
the acquiring module 41 is used for acquiring the residual electric quantity of the power battery and the total vehicle required power of the hybrid vehicle;
the processing module 42 is configured to process and analyze a relationship between the remaining power and the required power of the entire vehicle when the remaining power is within a preset power range, so as to obtain an analysis result; the control module 43 controls the switches and the operating powers of the power battery and the fuel battery according to the analysis result, so that the remaining electric quantity of the power battery approaches to an expected electric quantity value within the preset electric quantity range.
With the power distribution device 40, since the embodiment of the present disclosure is directed to the preset electric quantity range of the power battery, an expected electric quantity value within the preset electric quantity range is further set. Therefore, under the condition that the residual electric quantity of the power battery is smaller than the lower limit value of the expected electric quantity value larger than the preset electric quantity range, the fuel battery can be started and the power battery is charged (whether the fuel battery is started or not can be judged according to the required power of the whole vehicle during specific implementation), so that the residual electric quantity of the power battery approaches to the expected electric quantity value, the residual electric quantity of the power battery can be maintained in the preset electric quantity range for a longer time, and the influence of overcharge or overdischarge of the power battery on the service life of the power battery is reduced.
Optionally, the control module 43 is specifically configured to: under the condition that the analysis result represents that the required power of the whole vehicle is greater than the expected power of the power battery under the residual electric quantity and is less than the maximum output power of the fuel battery, the power battery is controlled to output the expected power, the difference power is controlled to be output by the fuel battery, and the value of the difference power is equal to the difference between the required power of the whole vehicle and the expected power, wherein the expected power of the power battery under the current residual electric quantity is positively correlated with the residual electric quantity, so that the output or the charge can be reduced when the power battery is close to the expected electric quantity value, the residual electric quantity of the power battery can be maintained in the preset electric quantity range for a longer time, and the influence of the over-charge or the over-discharge of the power battery on the service life of the power battery is reduced.
Optionally, the control module 43 is further configured to, under a condition that the analysis result indicates that the remaining power is in a preset power range and greater than the expected power value, preferentially control the power battery to provide output power that meets the required power of the entire vehicle if the required power of the entire vehicle is less than a sum of the expected power of the power battery under the remaining power and the maximum output power of the fuel battery, where the output power is not greater than the expected power, and the expected power of the power battery under the remaining power is positively correlated with the remaining power, and at this time, the power battery discharges, and when the power battery discharges and approaches the expected power of the power battery, the frequency of power battery over-discharge is avoided, and the service life of the power battery is facilitated.
Optionally, the control module 43 is further configured to, under the condition that the analysis result indicates that the remaining power is in the preset power range and smaller than the expected power value, if the vehicle required power is smaller than the maximum output power of the fuel cell, control the fuel cell to provide the output power meeting the vehicle required power and the charging power for the power cell, so that the power cell obtains a rapid charging effect when the remaining power is smaller than the expected power value, and avoids the frequency of power cell overdischarging, which is beneficial to the service life of the power cell.
Optionally, the control module 43 is further configured to, under the condition that the remaining power is smaller than the lower limit of the preset power range according to the analysis result, if the power demand of the entire vehicle is smaller than the high-efficiency output power of the fuel cell, control the fuel cell to provide output power meeting the power demand of the entire vehicle and charging power for the power cell;
and under the condition that the residual electric quantity is larger than the upper limit value of the preset electric quantity range, if the required power of the whole vehicle is larger than the expected power of the power battery under the residual electric quantity, controlling the power battery to output the maximum output power, wherein the expected power of the power battery under the residual electric quantity is positively correlated with the residual electric quantity. According to the scheme, when the residual electric quantity of the power battery is not within the preset electric quantity range, the power battery is charged and discharged in time, and the output power of the power battery is controlled during discharging to reduce discharging when the residual electric quantity of the power battery tends to the expected electric quantity, so that the residual electric quantity of the power battery can be maintained within the preset electric quantity range for a longer time, and the influence of over-charging or over-discharging of the power battery on the service life of the power battery is reduced.
Optionally, the expected power of the power battery at the remaining capacity is calculated by the following formula:
Pbal＝Pmax*(SOC-SOCpre)*2/(SOCmax-SOCmin)
and Pbal is the expected power, Pmax is the maximum charge-discharge power of the power battery, SOC represents the residual capacity of the power battery, SOCmax represents the upper limit value of the residual capacity of the power battery, and SOCmin represents the lower limit value of the residual capacity of the power battery.
Optionally, the control module 43 is further configured to, under the condition that the analysis result indicates that the remaining power is smaller than the upper limit value of the preset power range, if the power demand of the entire vehicle is a negative value, control the power battery to recover energy fed back by the hybrid vehicle, where the recovered power of the power battery is not greater than the maximum output power of the power battery.
For another example, the desired power may be a preset fixed power value, which is not limited by this disclosure.
The functions of the above modules are described in detail in the method steps in the above method embodiments, and are not described herein again.
The embodiment of the present disclosure further provides a hybrid vehicle, as shown in fig. 5, the hybrid vehicle includes a fuel cell 51, a power cell 52, and a power distribution device 40 (refer to the corresponding description above, and the description is not repeated here) as shown in fig. 4, where the power distribution device 40, the fuel cell 51, and the power cell 52, so as to implement the power distribution method of the hybrid vehicle provided in the embodiment of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A power distribution method of a hybrid vehicle, characterized in that the hybrid vehicle includes a fuel cell and a power cell, the method comprising:
acquiring the residual electric quantity of a power battery and the required power of the whole hybrid power vehicle;
and under the condition that the residual electric quantity is within a preset electric quantity range, distributing the output power of the power battery and the fuel battery according to the required power of the whole vehicle, so that the residual electric quantity of the power battery approaches to an expected electric quantity value within the preset electric quantity range.
2. The method according to claim 1, wherein the distributing the output power of the power battery and the fuel battery according to the vehicle required power under the condition that the residual capacity is in a preset capacity range comprises:
the surplus energy is in presetting the electric quantity scope and is greater than under the condition of expectation electric quantity value, if whole car required power is less than power battery is in the expected power under the surplus energy and under the condition of the sum of the maximum output power of fuel cell, priority control power battery provides and accords with the output of whole car required power, and this output is not more than expected power, wherein, power battery is in expected power under the surplus energy with surplus energy is positive correlation.
3. The method according to claim 1, wherein the distributing the output power of the power battery and the fuel battery according to the vehicle required power under the condition that the residual capacity is in a preset capacity range comprises:
and under the condition that the residual electric quantity is in a preset electric quantity range and is smaller than an expected electric quantity value, if the required power of the whole vehicle is smaller than the maximum output power of the fuel cell, controlling the fuel cell to provide output power meeting the required power of the whole vehicle and charging power of the power cell.
4. The method of claim 1, further comprising:
under the condition that the residual capacity is in the preset capacity range, if the whole vehicle demand power is greater than the power battery is in the expected power under the residual capacity and less than the maximum output power of the fuel battery, the power battery is controlled to output the expected power and control the fuel battery outputs the differential power, the value of the differential power is equal to the difference between the whole vehicle demand power and the expected power, wherein the power battery is in the expected power under the residual capacity and the residual capacity are positively correlated.
5. The method of claim 1, further comprising:
under the condition that the residual electric quantity is smaller than the lower limit value of the preset electric quantity range, if the required power of the whole vehicle is smaller than the high-efficiency point output power of the fuel cell, controlling the fuel cell to provide output power meeting the required power of the whole vehicle and charging power of the power cell;
and under the condition that the residual capacity is greater than the upper limit value of the preset capacity range, if the required power of the whole vehicle is greater than the expected power of the power battery under the residual capacity, controlling the power battery to output the maximum output power, wherein the expected power of the power battery under the residual capacity is positively correlated with the residual capacity.
6. The method according to claim 2 or 4, wherein the desired power of the power battery at the remaining capacity is calculated by the following formula:
Pbal＝Pmax*(SOC-SOCpre)*2/(SOCmax-SOCmin)
and Pbal the expected power, Pmax is the maximum charge-discharge power of the power battery, SOC represents the residual capacity of the power battery, SOCmax represents the upper limit value of the residual capacity of the power battery, and SOCmin represents the lower limit value of the residual capacity of the power battery.
7. The method according to any one of claims 1-5, further comprising:
and under the condition that the residual electric quantity is smaller than the upper limit value of the preset electric quantity range, if the required power of the whole vehicle is a negative value, controlling the power battery to recover the energy fed back by the hybrid vehicle, wherein the recovered power of the power battery is not larger than the maximum output power of the power battery.
8. A power distribution apparatus of a hybrid vehicle, characterized in that the hybrid vehicle includes a fuel cell and a power cell, the power distribution apparatus comprising:
the acquisition module is used for acquiring the residual electric quantity of the power battery and the total vehicle required power of the hybrid vehicle;
the processing module is used for processing and analyzing the relation between the residual electric quantity and the required power of the whole vehicle under the condition that the residual electric quantity is within a preset electric quantity range to obtain an analysis result;
and the control module controls the switches and the working powers of the power battery and the fuel battery according to the analysis result, so that the residual electric quantity of the power battery approaches to an expected electric quantity value in the preset electric quantity range.
9. The power distribution apparatus of claim 8, wherein the control module is specifically configured to:
the analysis result represents that the whole vehicle required power is greater than the power battery is in the expected power under the residual capacity and is less than the maximum output power of the fuel battery, the power battery is controlled to output the expected power and control the fuel battery outputs the difference power, the value of the difference power is equal to the difference between the whole vehicle required power and the expected power, wherein the expected power under the residual capacity of the power battery is positively correlated with the residual capacity.
10. A hybrid vehicle characterized by comprising a fuel cell, a power cell, and a power split device connected to the fuel cell and the power cell for performing the power split method of the hybrid vehicle according to any one of claims 1 to 7.
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