CN105667497A - Method and device for controlling power of electric drive system - Google Patents
Method and device for controlling power of electric drive system Download PDFInfo
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- CN105667497A CN105667497A CN201410664273.6A CN201410664273A CN105667497A CN 105667497 A CN105667497 A CN 105667497A CN 201410664273 A CN201410664273 A CN 201410664273A CN 105667497 A CN105667497 A CN 105667497A
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Abstract
The invention provides a method and device for controlling power of an electric drive system. The method includes the steps that a power compensation value of the electric drive system is obtained when the discharge power of a power battery meets a first limiting condition or the charge power of the power battery meets a second limiting condition; the first limiting condition associates with the discharge power and a discharge threshold of the power battery, and the second limiting condition associates with the charge power and a charge threshold of the power battery; and the drive power or the generation power of the electric drive system is determined according to the power compensation value. According to the method, during the discharge and charge process of the power battery, the drive power and the generation power of the electric drive system are controlled in real time according to the power compensation value, so that the actual discharge and charge power of the power battery is made to be within a reasonable power range, and the power battery is prevented from being overused; the service life of the power battery can be effectively prolonged, and vehicle performance is improved.
Description
Technical field
The present invention relates to the power drive system control field of automobile, particularly relate to Poewr control method and the device of a kind of power drive system.
Background technology
Along with the fast development of current auto industry, electro-motive vehicle, with its huge advantage in energy-conservation and environmental protection, becomes the important urban ground vehicles. Electro-motive vehicle refers to using electric energy as drive energy, provides power with vehicle power for motor, to drive the vehicle of the rotation of the wheel of vehicle. Electro-motive vehicle includes the vehicle of pure power drive system and the vehicle of hybrid power system. Described pure power driven system, refer to that the driving force of vehicle comes from motor, described hybrid power system refers to oil electric mixed dynamic system, i.e. the combining of fuel driven and electrical energy drive, and motor vehicle driven by mixed power is jointly to be realized the driving to vehicle by engine fuel and battery motor. The appearance of electro-motive vehicle, effectively reduces the discharge of vehicle exhaust in traditional energy drive pattern, makes automobile industry be entered into by simple " energy-conservation " in " new forms of energy " field of environmental protection.
In the vehicle of power drive system, require over electrokinetic cell and realize the storage to electric energy, by the charging of described electrokinetic cell, electric discharge etc., realize described power drive system is provided driving power or generated output, in order to ensure the normal service life of electrokinetic cell, the charge power to battery and discharge power is needed to limit, to avoid electrokinetic cell to be overused.
But, in power drive system, under various driving cycles, drive motor can consume or send different electrical power, the power that in power drive system, other adnexaes except motor consume simultaneously also has very big difference under different operating modes, and electrokinetic cell is at different state-of-charge (SOC, StateofCharge), under different temperatures and different unit voltage poised state, its maximum charge, discharge power also has a great difference, in prior art, it is difficult to ensure that the charge power of electrokinetic cell under various applying working conditions and discharge power are all within the scope of effective restriction, there is the probability that electrokinetic cell is overused.
Summary of the invention
What this invention address that is be difficult to ensure that electrokinetic cell is charged and discharged in rational power bracket, and electrokinetic cell can be caused to be overused, thus the problem affecting the service life of electrokinetic cell.
For solving the problems referred to above, the present invention provides the Poewr control method of a kind of power drive system, including:
Discharge power at electrokinetic cell meets the first restrictive condition or charge power when meeting the second restrictive condition, obtain the power compensating value of power drive system, described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell;
Driving power or the generated output of described power drive system is determined according to described power compensating value.
Optionally, described discharge threshold includes the first limits value and the second limits value, and described first limits value is the maximum discharge power of described electrokinetic cell; Described charge threshold includes the 3rd limits value and the 4th limits value, and described 3rd limits value is the maximum charge power of described electrokinetic cell.
Optionally, described method includes:
Described second limits value is obtained by formula P2=Kmd × P1;
Described 4th limits value is obtained by formula P4=Kmc × P3;
Wherein, P1 is described first limits value, and P2 is described second limits value, P3 is described 3rd limits value, P4 is described 4th limits value, and Kmd and Kmc is proportionality coefficient, and described Kmd and Kmc is determined according to the state-of-charge of described electrokinetic cell, Power Limitation and battery temperature.
Optionally, described first restrictive condition includes: the discharge power of described electrokinetic cell meets at least one situation in (P1-P2) < Pd≤P1 condition more than the discharge power of described first limits value and described electrokinetic cell;
Wherein, Pd is the discharge power of described electrokinetic cell, and P1 is described first limits value, and P2 is described second limits value.
Optionally, described second restrictive condition includes: the charge power of described electrokinetic cell meets at least one situation in (P3-P4) < Pc≤P3 condition more than the charge power of described 3rd limits value and described electrokinetic cell;
Wherein, Pc is the charge power of described electrokinetic cell, and P3 is described 3rd limits value, and P4 is described 4th limits value.
Optionally, described method includes: when the discharge power of described electrokinetic cell meets the first restrictive condition, obtains the power compensating value of described power drive system according to the discharge power of described electrokinetic cell and discharge threshold; When the charge power of described electrokinetic cell meets the second restrictive condition, obtain the power compensating value of described power drive system according to the charge power of described electrokinetic cell and charge threshold.
Optionally, the process of the power compensating value of described acquisition power drive system includes:
When the discharge power of described electrokinetic cell is more than described first limits value, it is determined that the first overflow value Δ P1 is: Δ P1=Pd-P1;
When the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, it is determined that the second overflow value Δ P2 is: Δ P2=Pd-P1+P2;
The power compensating value of described power drive system is determined according to described first overflow value or the second overflow value.
Optionally, the process of the power compensating value of described acquisition power drive system includes:
When the charge power of described electrokinetic cell is more than described three limits value, it is determined that the 3rd overflow value Δ P3 is: Δ P3=Pc-P3;
When the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, it is determined that the 4th overflow value Δ P4 is: Δ P4=Pc-P3+P4;
The power compensating value of described power drive system is determined according to described 3rd overflow value or the 4th overflow value.
Optionally, the power compensating value of described power drive system is obtained by equation below:
Ppnlty=(K1 × Δ P1+K2 × ∫ (Δ P1 × dt)) × A1+ (K3 × Δ P2+K4 × ∫ (Δ P2 × dt)) × A2+ (K5 × Δ P3+K6 × ∫ (Δ P3 × dt)) × A3+ (K7 × Δ P4+K8 × ∫ (Δ P4 × dt)) × A4
Wherein, Ppnlty is the power compensating value of described power drive system, K1～K8 is proportionality coefficient, A1 is the discharge power flag bit more than described first limits value of described electrokinetic cell, A2 is the flag bit of satisfied (P1-P2) < Pd≤P1 of discharge power of described electrokinetic cell, A3 is the charge power flag bit more than described 3rd limits value of described electrokinetic cell, and A4 is the flag bit of satisfied (P3-P4) < Pc≤P3 of charge power of described electrokinetic cell.
Optionally, described method also includes:
When the discharge power of described electrokinetic cell meets the first restrictive condition, the power compensating value of acquired power drive system meets Ppnlty1≤P1;
When the charge power of described electrokinetic cell meets the second restrictive condition, the power compensating value of acquired power drive system meets Ppnlty2≤P3;
Wherein, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, Ppnlty2 is the power compensating value of power drive system when the charge power of described electrokinetic cell meets the second restrictive condition, P1 is the maximum discharge power of described electrokinetic cell, and P3 is the maximum charge power of described electrokinetic cell.
Optionally, the described process driving power or generated output determining described power drive system includes:
Pass through formula: Pmot=P1-Ppnlty1 determines the driving power of described power drive system;
Pass through formula: Pgen=P3-Ppnlty2 determines the generated output of described power drive system;
Wherein, PmotFor the driving power of described power drive system, PgenGenerated output for described power drive system, P1 is the maximum discharge power of described electrokinetic cell, P3 is the maximum charge power of described electrokinetic cell, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, and Ppnlty2 is the power compensating value of the power drive system when the charge power of described electrokinetic cell meets the second restrictive condition.
Optionally, described method also includes: according to drive power or the generated output of described power drive system, driving power or the generated output of the motor in described power drive system are allocated.
For solving the problems referred to above, technical solution of the present invention also provides for the output control device of a kind of power drive system, and described device includes:
Offset acquiring unit, for when the discharge power of electrokinetic cell meets the first restrictive condition or charge power meets the second restrictive condition, obtain the power compensating value of power drive system, described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell;
Power control unit, for determining driving power or the generated output of described power drive system according to described power compensating value.
Compared with prior art, technical scheme has the advantage that
Discharge power and discharge threshold according to electrokinetic cell set the first restrictive condition, charge power and charge threshold according to electrokinetic cell set the second restrictive condition, discharge power at electrokinetic cell meets the first restrictive condition or charge power when meeting the second restrictive condition, show that discharge power and the charge power of electrokinetic cell are in the operating mode being likely to or alreading more than reasonable Power Limitation, now obtain the power compensating value of described power drive system, determine driving rate and the generated output of described power drive system according to described power compensating value. the method can be discharged at electrokinetic cell, in the process of charging, in real time by the actual electric discharge of electrokinetic cell, charge power and the first restrictive condition and the second restrictive condition contrast, when meeting restrictive condition, obtain power compensating value, it is controlled according to the described power compensating value driving power to power drive system and generated output, discharge at electrokinetic cell, in the process of charging, aforesaid operations can be repeated in real time, until making the actual discharge of electrokinetic cell, charge power falls within rational power bracket, electrokinetic cell can be prevented effectively from be overused, extend the service life of electrokinetic cell, improve vehicle performance.
Further, by the first limits value and the second limits value, the first restrictive condition is determined, set the 3rd limits value and the second restrictive condition is determined by the 4th limits value, make at the discharge power of electrokinetic cell or charge power when exceeding rational power use scope or have to violate trend that rational power uses scope, just driving power or generated output to drive system can be controlled in time, be prevented effectively from being overused of electrokinetic cell.
In obtaining the process of power compensating value of power drive system, determine that correspondence meets the overflow value of each restrictive condition respectively, integration according to certain proportionate relationship and with corresponding overflow value obtains the power compensating value of described power drive system, in the process can discharge at electrokinetic cell, charged, make to increase over time, according to the power compensating value that integral result obtains, the actual discharge of electrokinetic cell, charge power are fallen within rational power bracket by final realization.
Further, after the driving power determining described power drive system and generated output, the driving power of the motor of power drive system and generated output can be allocated and controls, realize the control of the driving torque to motor and power generation torque, the actual power of electrokinetic cell is strictly limited within reasonable effective scope, it is to avoid the excessive use of electrokinetic cell.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the Poewr control method of the power drive system that technical solution of the present invention provides;
Fig. 2 is the schematic flow sheet of the Poewr control method of the power drive system that one embodiment of the invention provides;
Fig. 3 is the schematic flow sheet of the Poewr control method of the power drive system that another embodiment of the present invention provides;
Fig. 4 is the structural representation of the output control device of the power drive system that the embodiment of the present invention provides.
Detailed description of the invention
Prior art exists the charge power being difficult to ensure that electrokinetic cell under various applying working conditions and discharge power all in, within the scope of effective restriction, there is the problem that electrokinetic cell is overused.
For solving the problems referred to above, technical solution of the present invention provides the Poewr control method of a kind of power drive system.As it is shown in figure 1, perform step S1, the discharge power at electrokinetic cell meets the first restrictive condition or charge power when meeting the second restrictive condition, obtains the power compensating value of power drive system.
Described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell.
Described discharge threshold includes the first limits value and the second limits value, for the discharge power scope safe, rational of electrokinetic cell is determined. Being the first limits value maximum discharge power of referring to electrokinetic cell, the maximum discharge power of electrokinetic cell can be estimated according to the state of electrokinetic cell, and being estimated as of the peak power of electrokinetic cell as it is known to those skilled in the art that and do not repeat them here. The setting of described second limits value is to be not reaching to described first limits value at the discharge power of electrokinetic cell, but it is in ratio time in relatively hazardous power bracket, if continuing to rise, it is likely to electrokinetic cell is caused damage, so can in advance the discharge power of electrokinetic cell be limited by the second limits value, prevent the excessive use of electrokinetic cell. Such as, described second limits value can less than described first limits value, determining described second limits value according to certain proportionate relationship according to described first limits value, described proportionate relationship can be determined accordingly according to the state-of-charge of electrokinetic cell, Power Limitation and battery temperature.
Described charge threshold includes the 3rd limits value and the 4th limits value, described 3rd limits value refers to the maximum charge power of electrokinetic cell, the maximum charge power of electrokinetic cell is estimated according to the state of electrokinetic cell, in like manner, according to described 3rd limits value, proportionally relation may determine that the 4th limits value.
After determining the first limits value, the second limits value, the 3rd limits value and the 4th limits value, just can set that the restrictive condition of correspondence, i.e. the first restrictive condition and the second restrictive condition, when the actual power of described electrokinetic cell meets the first restrictive condition or the second restrictive condition, illustrate that the actual power of described electrokinetic cell has been in ratio in relatively hazardous operating mode, the driving power to power drive system and generated output is needed to be controlled, so that the actual power of electrokinetic cell falls back within rational power bracket again.
When the discharge power of electrokinetic cell meets the first restrictive condition, actual discharge power according to electrokinetic cell and the first limits value and the second limits value obtain the power compensating value of power drive system, when the charge power of electrokinetic cell meets the second restrictive condition, obtain corresponding power compensating value according to the actual charge power of electrokinetic cell and the 3rd limits value and the 4th limits value.
Perform step S2, determine driving power or the generated output of described power drive system according to described power compensating value.
Compensate according to the described power compensating value driving power to power drive system or generated output, specifically, according to the power compensating value of the power drive system acquired when electrokinetic cell discharges, the driving power of power drive system can be adjusted correspondingly, according to the power compensating value of the power drive system acquired when power battery charging, the generated output of power drive system is adjusted correspondingly.
Said method can discharge at electrokinetic cell, in the process of charging, in real time by the actual electric discharge of electrokinetic cell, charge power and the first restrictive condition and the second restrictive condition contrast, when meeting restrictive condition, obtain power compensating value, it is controlled according to the described power compensating value driving power to power drive system and generated output, discharge at electrokinetic cell, in the process of charging, aforesaid operations can be repeated in real time, until making the actual discharge of electrokinetic cell, charge power falls within rational power bracket, can effectively extend the service life of electrokinetic cell, improve vehicle performance.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
In the present embodiment, illustrate for described power drive system for hybrid power system. Described power drive system includes entire car controller (VCU, VehicleControlUnit), by electrokinetic cell that is multiple monomer series-connected or that compose in parallel and battery management system (BMS, BatteryManagementSystem), drive motor (TM, T-Motor), power generation integrated motor (ISG, IntegratedStartedGenerator), electromotor, high-tension electricity air-conditioning and DC-to-dc converter (DC-DCinverter) are started. Electrokinetic cell, TM, ISG, high-tension electricity air-conditioning and DC-DCinverter are on same high voltage dc bus, VCU in power drive system receives the various information from BMS, TM, ISG simultaneously, and send main contactor to BMS and open-close instruction, to the restriction of TM, ISG maximum drive torque and maximum generation torque limit, send peak power restriction to high-tension electricity air-conditioning, and send running voltage set point to determine its output to DC-DCinverter.
In conjunction with power drive system as above, the Poewr control method of the present invention is described. In the present embodiment, specifically illustrate for the control to the discharge power of electrokinetic cell.
Fig. 2 is the schematic flow sheet of the Poewr control method of the power drive system that the present embodiment provides.
Perform step S201, obtain the first limits value and the second limits value.
Described first limits value is the maximum discharge power of electrokinetic cell, and described first limits value can pass through entire car controller VCU and obtain according to the information from power battery management system BMS received.
The second limits value is obtained according to described first limits value.
Specifically, it is possible to obtain described second limits value by formula (1).
P2=Kmd × P1 (1)
Wherein, P1 is described first limits value, and P2 is described second limits value, and Kmd is proportionality coefficient.
Kmd is the proportionality coefficient less than 1, described Kmd can be obtained by demarcation according to the result of electrokinetic cell experiment and vehicle test, it is possible in conjunction with the state-of-charge of described electrokinetic cell, the coolant temperature of electrokinetic cell, the maximum temperature of electrokinetic cell monomer, the minimum temperature of electrokinetic cell monomer and the maximum discharge power of electrokinetic cell, described Kmd is determined.
After obtaining the first limits value and the second limits value, it is possible to the actual power of current power battery and the first limits value, the second restriction being analyzed, whether the actual power to determine electrokinetic cell is within rational power bracket.
Perform step S202, it is judged that whether the discharge power of electrokinetic cell meets the first restrictive condition.
Described first restrictive condition includes the discharge power of described electrokinetic cell and meets at least one situation in (P1-P2) < Pd≤P1 condition more than the discharge power of described first limits value and described electrokinetic cell, wherein, Pd is the actual discharge power of electrokinetic cell.
Described first limits value, it can be appreciated that be that the hard of electrokinetic cell electric discharge limits, when the actual discharge power P d of described electrokinetic cell exceedes described first limits value, namely exceedes when firmly limiting of electric discharge, it is determined that meet the first restrictive condition. Generally, the discharge power of described electrokinetic cell be on the occasion of.
In order to can better the discharge power of electrokinetic cell effectively be protected, it is possible to set described first restrictive condition in conjunction with the second limits value.
Described second limits value can be understood as be electrokinetic cell electric discharge soft restriction, when the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, it is called the soft restriction exceeding electrokinetic cell electric discharge, now can also be defined as meeting the first restrictive condition.
Being stepped up of discharge power along with electrokinetic cell, it is possible that first exceed soft restriction as above, namely the discharge power of electrokinetic cell meets (P1-P2) < Pd≤P1, along with the discharge power of electrokinetic cell continues to increase, the hard restriction of electrokinetic cell electric discharge can be exceeded, namely the discharge power of electrokinetic cell meets Pd > P1, in such cases, is still determining that the discharge power of electrokinetic cell meets the first restrictive condition.
If step S202 judged result is "Yes", perform step S203; Otherwise return and perform step S201, determine corresponding first limits value and the second limits value according to the electric discharge operating mode that electrokinetic cell is current, and then the actual discharge power of follow-up driving force battery is analyzed.
Perform step S203, obtain the first overflow value and the second overflow value.
The actual discharge power of electrokinetic cell is analyzed beyond the degree of the first limits value and/or the second limits value.
When the discharge power of described electrokinetic cell is more than described first limits value, obtain the first overflow value Δ P1 by formula (2).
Δ P1=Pd-P1 (2)
When the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, obtain the second overflow value Δ P2 by formula (3).
Δ P2=Pd-P1+P2 (3)
If the actual discharge power of current power battery has only exceeded soft restriction, when namely meeting (P1-P2) < Pd≤P1, the power compensating value of power drive system can be obtained according to described second overflow value, if the actual discharge power of current power battery have also exceeded hard restriction, then can obtain the power compensating value of power drive system in combination with the first overflow value and the second overflow value.
For the ease of the follow-up calculating to power compensating value, can set that corresponding flag bit, such as when the discharge power of described electrokinetic cell is more than described first limits value, the first flag bit is carried out set, when being unsatisfactory for this condition, described first flag bit is resetted.
When the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, the second flag bit is carried out set, when being unsatisfactory for this condition, described second flag bit is resetted.
Just the condition that described electrokinetic cell is met clearly can be made a distinction by described flag bit.
Perform step S204, obtain the power compensating value of the discharge power of corresponding electrokinetic cell according to the first overflow value and the second overflow value.
Formula (4) can be passed through and obtain the power compensating value of described power drive system.
Ppnlty=(K1 × Δ P1+K2 × ∫ (Δ P1 × dt)) × A1+ (K3 × Δ P2+K4 × ∫ (Δ P2 × dt)) × A2+ (K5 × Δ P3+K6 × ∫ (Δ P3 × dt)) × A3+ (K7 × Δ P4+K8 × ∫ (Δ P4 × dt)) × A4 (4)
Wherein, Ppnlty is the power compensating value of described power drive system, K1～K8 is proportionality coefficient, A1 is the discharge power flag bit more than described first limits value of described electrokinetic cell, A2 is the flag bit of satisfied (P1-P2) < Pd≤P1 of discharge power of described electrokinetic cell, A3 is the charge power flag bit more than described 3rd limits value of described electrokinetic cell, A4 be described electrokinetic cell charge power meet (P3-P4) < Pc≤P3 flag bit.
Described K1～K8 can determine accordingly according to the experimental data of electrokinetic cell and vehicle test data, wherein, P3 and P4 is required the 3rd limits value used and the 4th limits value, the flag that the condition that the charge power of electrokinetic cell is respectively met by A3 and A4 indicates when the charge power of electrokinetic cell is analyzed.Charge power related content about electrokinetic cell can describe in other embodiments in detail, is not first specifically described at this.
In the process of electrokinetic cell electric discharge, the flag that the charging of corresponding electrokinetic cell is relevant should be reset, that is in formula (4), it is 0 that the value of A3 and A4 can be understood as, the value of A1 and A2 is 1, then the power compensating value Ppnlty for power drive system depend primarily on and discharge relevant each coefficient, flag bit value.
In conjunction with A1 and A2 flag bit and the first overflow value and the second overflow value, the power compensating value Ppnlty of the discharge power of corresponding electrokinetic cell can be obtained by formula (4).
In the present embodiment, the power compensating value Ppnlty of the discharge power of the corresponding electrokinetic cell acquired by formula (4) is designated as Ppnlty1.
The power compensating value Ppnlty1 of the discharge power of described corresponding electrokinetic cell is subject to the restriction of the maximum discharge power P1 of electrokinetic cell, and described Ppnlty1 should less than or equal to the maximum discharge power P1 of electrokinetic cell.
Perform step S205, determine the driving power of power drive system according to the power compensating value of the discharge power of corresponding electrokinetic cell.
The driving power of described power drive system is obtained according to formula (5).
Pmot=P1-Ppnlty1 (5)
Wherein, PmotDriving power for described power drive system.
The power compensating value Ppnlty1 of discharge power and the maximum discharge power P1 of electrokinetic cell in conjunction with corresponding electrokinetic cell obtain the driving power P of power drive system by formula (5)mot。
Perform step S206, according to the power that drives of described power drive system, the driving power of the motor in described power drive system is allocated.
In order to obtain the maximum drive torque of TM, ISG in above-mentioned power drive system, it is possible to by the driving power P of power drive system acquired in step S205motDeduct in drive system the power of the adnexa actual consumptions such as electricity air-conditioning, and according to certain ratio, available driving power remaining after adnexa consumption is allocated between TM, ISG, then extrapolate respective driving torque according to the efficiency characteristic of TM, ISG.
The Poewr control method of the power drive system that the present embodiment provides, the first restrictive condition is determined by the first limits value and the second limits value, when making the discharge power at electrokinetic cell exceed rational power bracket or have the trend violating rational power use scope, it is possible in time the driving power of drive system is controlled; In obtaining the process of power compensating value of power drive system, integration according to certain proportionate relationship and with corresponding overflow value obtains the power compensating value of described power drive system, can in electrokinetic cell discharge process, make to increase over time, according to the power compensating value that integral result obtains, the actual discharge power of electrokinetic cell is fallen within rational power bracket by final realization, is prevented effectively from being overused of described electrokinetic cell.
Further, after determining the driving power of described power drive system, it is possible to the driving power of the motor of power drive system is allocated and controls, it is achieved the control to the driving torque of motor.
In another embodiment of the invention, illustrate with the control to the charge power of electrokinetic cell.
Fig. 3 is the Poewr control method schematic flow sheet of the power drive system that another embodiment of the present invention provides.
Perform step S301, obtain the 3rd limits value and the 4th limits value.
Described 3rd limits value is the maximum charge power of electrokinetic cell, and described 3rd limits value can pass through entire car controller VCU and obtain according to the information from power battery management system BMS received.
The 4th limits value is obtained according to described 3rd limits value.
Specifically, it is possible to obtain described 4th limits value by formula (6).
P4=Kmc × P3 (6)
P3 is described 3rd limits value, and P4 is described 4th limits value, and Kmc is proportionality coefficient.
The Kmc proportionality coefficient less than 1, the equally possible result according to electrokinetic cell experiment and vehicle test of described Kmc is obtained by demarcation, in conjunction with the state-of-charge of described electrokinetic cell, the coolant temperature of electrokinetic cell, the maximum temperature of electrokinetic cell monomer, the minimum temperature of electrokinetic cell monomer and the maximum charge power of electrokinetic cell, described Kmc is determined.
After obtaining the 3rd limits value and the 4th limits value, it is possible to the actual power of current power battery and the 3rd limits value, the 4th restriction being analyzed, whether the actual power to determine electrokinetic cell is within rational power bracket.
Perform step S302, it is judged that whether the charge power of electrokinetic cell meets the second restrictive condition.
Described second restrictive condition includes: the charge power of described electrokinetic cell meets at least one situation in (P3-P4) < Pc≤P3 condition more than the charge power of described 3rd limits value and described electrokinetic cell;
Wherein, Pc is the charge power of described electrokinetic cell.
Described 3rd limits value, it can be appreciated that be that the hard of power battery charging limits, when the actual charge power Pc of described electrokinetic cell is more than described three limits value, namely represent more than when firmly limiting of charging, now may determine that satisfied second restrictive condition.
In order to can better the charge power of electrokinetic cell effectively be protected, it is possible to set described second restrictive condition in conjunction with the 4th limits value.
It is the soft restriction of power battery charging that described 4th limits value can be understood as, when the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, it is called the soft restriction exceeding power battery charging, it is also possible to be defined as meeting the second restrictive condition.
Being stepped up of charge power along with electrokinetic cell, it is possible that first exceed soft restriction as above, namely when the discharge power of electrokinetic cell meets (P3-P4) < Pc≤P3, along with the charge power of electrokinetic cell continues to increase, the hard restriction of power battery charging can be exceeded, namely the charge power of electrokinetic cell meets Pc > P3, in such cases, is still determining that the charge power of electrokinetic cell meets the second restrictive condition.
If step S302 judged result is "Yes", perform step S303; Otherwise return and perform step S3201, determine corresponding 3rd limits value and the 4th limits value according to the charging operating mode that electrokinetic cell is current, and then the actual charge power of follow-up driving force battery is analyzed.
Perform step S303, obtain the 3rd overflow value and the 4th overflow value.
The actual charge power of electrokinetic cell is analyzed beyond the degree of the 3rd limits value and/or the 4th limits value.
When the charge power of described electrokinetic cell is more than described three limits value, determine the 3rd overflow value Δ P3 by formula (7).
Δ P3=Pc-P3 (7)
When the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, obtain four overflow value Δ P4 by formula (8).
Δ P4=Pc-P3+P4 (8)
If the actual charge power of current power battery has only exceeded soft restriction, when namely meeting (P3-P4) < Pc≤P3, the power compensating value of power drive system can be obtained according to described 4th overflow value, if the actual charge power of current power battery have also exceeded hard restriction, then can obtain the power compensating value of power drive system in combination with the 3rd overflow value and the 4th overflow value.
For the ease of the follow-up calculating to power compensating value, can set that corresponding flag bit, such as when the charge power of described electrokinetic cell is more than described three limits value, the 3rd flag bit is carried out set, when being unsatisfactory for this condition, described 3rd flag bit is resetted.
When the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, the 4th flag bit is carried out set, when being unsatisfactory for this condition, described 4th flag bit is resetted.
Perform step S304, obtain the power compensating value of the charge power of corresponding electrokinetic cell according to the 3rd overflow value and the 4th overflow value.
The power compensating value method obtaining power drive system in step S304 can adopt the method identical with procedure described above S204, namely obtains the power compensating value of described power drive system also by formula (4).
In the process of power battery charging, the flag that the electric discharge of corresponding electrokinetic cell is relevant should be reset, that is in formula (4), it is 0 that the value of A1 and A2 can be understood as, the value of A3 and A4 can be 1, then the power compensating value Ppnlty for power drive system depend primarily on and charge relevant each coefficient, flag bit value.
In conjunction with A3 and A4 flag bit and the 3rd overflow value and the 4th overflow value, the power compensating value Ppnlty of the charge power of corresponding electrokinetic cell can be obtained by formula (4).
In the present embodiment, the power compensating value Ppnlty of the charge power of the corresponding electrokinetic cell acquired by formula (4) is designated as Ppnlty2.
The power compensating value Ppnlty2 of the charge power of described corresponding electrokinetic cell is subject to the restriction of the maximum charge power P 3 of electrokinetic cell, and described Ppnlty2 should less than or equal to the maximum charge power P 3 of electrokinetic cell.
Perform step S305, determine the generated output of power drive system according to the power compensating value of the charge power of corresponding electrokinetic cell.
The generated output of described power drive system is obtained according to formula (9).
Pgen=P3-Ppnlty2 (9)
Wherein, PgenGenerated output for described power drive system.
The power compensating value Ppnlty2 of charge power and the maximum charge power P 3 of the electrokinetic cell generated output P by formula (9) acquisition power drive system in conjunction with corresponding electrokinetic cellgen。
Perform step S306, according to the generated output of described power drive system, the generated output of the motor in described power drive system is allocated.
In order to obtain the maximum generation moment of torsion of TM, ISG in above-mentioned power drive system, it is possible to by the generated output P of power drive system acquired in step S305genDeduct in drive system the power of the adnexa actual consumptions such as electricity air-conditioning, and according to certain ratio, available generated output remaining after adnexa consumption is allocated between TM, ISG, then extrapolate respective power generation torque according to the efficiency characteristic of TM, ISG.
The Poewr control method of the power drive system that the present embodiment provides, the second restrictive condition is determined by the 3rd limits value and the 4th limits value, when making the charge power at electrokinetic cell exceed rational power bracket or have the trend violating rational power use scope, just can in time the generated output of drive system be controlled, the actual charge power of electrokinetic cell is fallen within rational power bracket, is prevented effectively from being overused of described electrokinetic cell. Further, after the generated output determining described power drive system, it is possible to the generated output of the motor of power drive system is allocated and controls, it is achieved the control to the power generation torque of motor.
The Poewr control method of corresponding above-mentioned power drive system, the embodiment of the present invention also provides for the output control device of a kind of power drive system.
Fig. 4 is the structural representation of the output control device of the power drive system that the present embodiment provides. As shown in Figure 4, described device includes: offset acquiring unit U11 and power control unit U12.
Described offset acquiring unit U11, for when the discharge power of electrokinetic cell meets the first restrictive condition or charge power meets the second restrictive condition, obtain the power compensating value of power drive system, described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell. Described discharge threshold includes the first limits value and the second limits value, and described first limits value is the maximum discharge power of described electrokinetic cell; Described charge threshold includes the 3rd limits value and the 4th limits value, and described 3rd limits value is the maximum charge power of described electrokinetic cell.
Described power control unit U12, for determining driving power or the generated output of described power drive system according to described power compensating value.
Described device also includes first condition and determines that unit U13 and second condition determine unit U14.
Described first condition determines unit U13, is used for determining that the first restrictive condition is: the discharge power of described electrokinetic cell meets at least one situation in (P1-P2) < Pd≤P1 condition more than the discharge power of described first limits value and described electrokinetic cell and sets up. Wherein, Pd is the discharge power of described electrokinetic cell, and P1 is described first limits value, and P2 is described second limits value.
Described second condition determines unit U14, is used for determining that the second restrictive condition is: the charge power of described electrokinetic cell meets at least one situation in (P3-P4) < Pc≤P3 condition more than the charge power of described 3rd limits value and described electrokinetic cell. Wherein, Pc is the charge power of described electrokinetic cell, and P3 is described 3rd limits value, and P4 is described 4th limits value.
Described device also includes the first overflow value acquiring unit U15, the second overflow value acquiring unit U16, the 3rd overflow value acquiring unit U17 and the four overflow value acquiring unit U18.
Described first overflow value acquiring unit U15, for when the discharge power of described electrokinetic cell is more than described first limits value, it is determined that the first overflow value Δ P1 is: Δ P1=Pd-P1.
Described second overflow value acquiring unit U16, for when the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, it is determined that the second overflow value Δ P2 is: Δ P2=Pd-P1+P2.
Described 3rd overflow value acquiring unit U17, for when the charge power of described electrokinetic cell is more than described three limits value, it is determined that the 3rd overflow value Δ P3 is: Δ P3=Pc-P3.
Described 4th overflow value acquiring unit U18, for when the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, it is determined that the 4th overflow value Δ P4 is: Δ P4=Pd-P3+P4.
Described device also includes limiting unit U19.
Described limiting unit U19, for when the discharge power of described electrokinetic cell meets the first restrictive condition, the power compensating value making acquired power drive system meets P1≤Ppnlty1, or when the charge power of described electrokinetic cell meets the second restrictive condition, make the power compensating value of acquired power drive system meet P2≤Ppnlty2; Wherein, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, and Ppnlty2 is the power compensating value of the power drive system when the charge power of described electrokinetic cell meets the first restrictive condition.
Described device also includes allocation units U20.
Described allocation units U20, is allocated driving power or the generated output of the motor in described power drive system for drive power or the generated output according to described power drive system.
Although present disclosure is as above, but the present invention is not limited to this. Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (18)
1. the Poewr control method of a power drive system, it is characterised in that including:
Discharge power at electrokinetic cell meets the first restrictive condition or charge power when meeting the second restrictive condition, obtain the power compensating value of power drive system, described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell;
Driving power or the generated output of described power drive system is determined according to described power compensating value.
2. the Poewr control method of power drive system as claimed in claim 1, it is characterised in that described discharge threshold includes the first limits value and the second limits value, and described first limits value is the maximum discharge power of described electrokinetic cell; Described charge threshold includes the 3rd limits value and the 4th limits value, and described 3rd limits value is the maximum charge power of described electrokinetic cell.
3. the Poewr control method of power drive system as claimed in claim 2, it is characterised in that including:
Described second limits value is obtained by formula P2=Kmd × P1;
Described 4th limits value is obtained by formula P4=Kmc × P3;
Wherein, P1 is described first limits value, and P2 is described second limits value, P3 is described 3rd limits value, P4 is described 4th limits value, and Kmd and Kmc is proportionality coefficient, and described Kmd and Kmc is determined according to the state-of-charge of described electrokinetic cell, Power Limitation and battery temperature.
4. the Poewr control method of power drive system as claimed in claim 2, it is characterized in that, described first restrictive condition includes: the discharge power of described electrokinetic cell meets at least one situation in (P1-P2) < Pd≤P1 condition more than the discharge power of described first limits value and described electrokinetic cell;
Wherein, Pd is the discharge power of described electrokinetic cell, and P1 is described first limits value, and P2 is described second limits value.
5. the Poewr control method of power drive system as claimed in claim 2, it is characterized in that, described second restrictive condition includes: the charge power of described electrokinetic cell meets at least one situation in (P3-P4) < Pc≤P3 condition more than the charge power of described 3rd limits value and described electrokinetic cell;
Wherein, Pc is the charge power of described electrokinetic cell, and P3 is described 3rd limits value, and P4 is described 4th limits value.
6. the Poewr control method of power drive system as claimed in claim 1, it is characterized in that, including: when the discharge power of described electrokinetic cell meets the first restrictive condition, obtain the power compensating value of described power drive system according to the discharge power of described electrokinetic cell and discharge threshold; When the charge power of described electrokinetic cell meets the second restrictive condition, obtain the power compensating value of described power drive system according to the charge power of described electrokinetic cell and charge threshold.
7. the Poewr control method of power drive system as claimed in claim 4, it is characterised in that the process of the power compensating value of described acquisition power drive system includes:
When the discharge power of described electrokinetic cell is more than described first limits value, it is determined that the first overflow value Δ P1 is: Δ P1=Pd-P1;
When the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, it is determined that the second overflow value Δ P2 is: Δ P2=Pd-P1+P2;
The power compensating value of described power drive system is determined according to described first overflow value or the second overflow value.
8. the Poewr control method of power drive system as claimed in claim 5, it is characterised in that the process of the power compensating value of described acquisition power drive system includes:
When the charge power of described electrokinetic cell is more than described three limits value, it is determined that the 3rd overflow value Δ P3 is: Δ P3=Pc-P3;
When the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, it is determined that the 4th overflow value Δ P4 is: Δ P4=Pc-P3+P4;
The power compensating value of described power drive system is determined according to described 3rd overflow value or the 4th overflow value.
9. the Poewr control method of power drive system as claimed in claim 7 or 8, it is characterised in that obtained the power compensating value of described power drive system by equation below:
Ppnlty=(K1 × Δ P1+K2 × ∫ (Δ P1 × dt)) × A1+ (K3 × Δ P2+K4 × ∫ (Δ P2 × dt)) × A2+ (K5 × Δ P3+K6 × ∫ (Δ P3 × dt)) × A3+ (K7 × Δ P4+K8 × ∫ (Δ P4 × dt)) × A4
Wherein, Ppnlty is the power compensating value of described power drive system, K1～K8 is proportionality coefficient, A1 is the discharge power flag bit more than described first limits value of described electrokinetic cell, A2 is the flag bit of satisfied (P1-P2) < Pd≤P1 of discharge power of described electrokinetic cell, A3 is the charge power flag bit more than described 3rd limits value of described electrokinetic cell, and A4 is the flag bit of satisfied (P3-P4) < Pc≤P3 of charge power of described electrokinetic cell.
10. the Poewr control method of power drive system as claimed in claim 1, it is characterised in that also include:
When the discharge power of described electrokinetic cell meets the first restrictive condition, the power compensating value of acquired power drive system meets Ppnlty1≤P1;
When the charge power of described electrokinetic cell meets the second restrictive condition, the power compensating value of acquired power drive system meets Ppnlty2≤P3;
Wherein, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, Ppnlty2 is the power compensating value of power drive system when the charge power of described electrokinetic cell meets the second restrictive condition, P1 is the maximum discharge power of described electrokinetic cell, and P3 is the maximum charge power of described electrokinetic cell.
11. the Poewr control method of power drive system as claimed in claim 1, it is characterised in that the described process driving power or generated output determining described power drive system includes:
Pass through formula: Pmot=P1-Ppnlty1 determines the driving power of described power drive system;
Pass through formula: Pgen=P3-Ppnlty2 determines the generated output of described power drive system;
Wherein, PmotFor the driving power of described power drive system, PgenGenerated output for described power drive system, P1 is the maximum discharge power of described electrokinetic cell, P3 is the maximum charge power of described electrokinetic cell, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, and Ppnlty2 is the power compensating value of the power drive system when the charge power of described electrokinetic cell meets the second restrictive condition.
12. the Poewr control method of power drive system as claimed in claim 1, it is characterised in that also include: driving power or the generated output of the motor in described power drive system are allocated according to drive power or the generated output of described power drive system.
13. the output control device of a power drive system, it is characterised in that including:
Offset acquiring unit, for when the discharge power of electrokinetic cell meets the first restrictive condition or charge power meets the second restrictive condition, obtain the power compensating value of power drive system, described first restrictive condition is associated with discharge power and the discharge threshold of described electrokinetic cell, and described second restrictive condition is associated with charge power and the charge threshold of described electrokinetic cell;
Power control unit, for determining driving power or the generated output of described power drive system according to described power compensating value.
14. the output control device of power drive system as claimed in claim 13, it is characterised in that described discharge threshold includes the first limits value and the second limits value, and described first limits value is the maximum discharge power of described electrokinetic cell; Described charge threshold includes the 3rd limits value and the 4th limits value, and described 3rd limits value is the maximum charge power of described electrokinetic cell.
15. the output control device of power drive system as claimed in claim 14, it is characterised in that also include:
First condition determines unit, is used for determining that the first restrictive condition is: the discharge power of described electrokinetic cell meets at least one situation in (P1-P2) < Pd≤P1 condition more than the discharge power of described first limits value and described electrokinetic cell and sets up;
Second condition determines unit, is used for determining that the second restrictive condition is: the charge power of described electrokinetic cell meets at least one situation in (P3-P4) < Pc≤P3 condition more than the charge power of described 3rd limits value and described electrokinetic cell;
Wherein, Pd is the discharge power of described electrokinetic cell, and P1 is described first limits value, and P2 is described second limits value, and Pc is the charge power of described electrokinetic cell, and P3 is described 3rd limits value, and P4 is described 4th limits value.
16. the output control device of power drive system as claimed in claim 15, it is characterised in that also include:
First overflow value acquiring unit, for when the discharge power of described electrokinetic cell is more than described first limits value, it is determined that the first overflow value Δ P1 is: Δ P1=Pd-P1;
Second overflow value acquiring unit, for when the discharge power of described electrokinetic cell meets (P1-P2) < Pd≤P1, it is determined that the second overflow value Δ P2 is: Δ P2=Pd-P1+P2;
3rd overflow value acquiring unit, for when the charge power of described electrokinetic cell is more than described three limits value, it is determined that the 3rd overflow value Δ P3 is: Δ P3=Pc-P3;
4th overflow value acquiring unit, for when the charge power of described electrokinetic cell meets (P3-P4) < Pc≤P3, it is determined that the 4th overflow value Δ P4 is: Δ P4=Pc-P3+P4.
17. the output control device of power drive system as claimed in claim 13, it is characterised in that also include:
Limiting unit, for when the discharge power of described electrokinetic cell meets the first restrictive condition, the power compensating value making acquired power drive system meets Ppnlty1≤P1, or when the charge power of described electrokinetic cell meets the second restrictive condition, make the power compensating value of acquired power drive system meet Ppnlty2≤P3;
Wherein, Ppnlty1 is the power compensating value of power drive system when the discharge power of described electrokinetic cell meets the first restrictive condition, Ppnlty2 is the power compensating value of power drive system when the charge power of described electrokinetic cell meets the second restrictive condition, P3 is the maximum charge power of described electrokinetic cell, and P1 is the maximum discharge power of described electrokinetic cell.
18. the output control device of power drive system as claimed in claim 13, it is characterised in that also include:
Allocation units, are allocated driving power or the generated output of the motor in described power drive system for drive power or the generated output according to described power drive system.
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