CN109334508A - Power battery charge and discharge protecting method and device - Google Patents
Power battery charge and discharge protecting method and device Download PDFInfo
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- CN109334508A CN109334508A CN201811123672.6A CN201811123672A CN109334508A CN 109334508 A CN109334508 A CN 109334508A CN 201811123672 A CN201811123672 A CN 201811123672A CN 109334508 A CN109334508 A CN 109334508A
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- position signal
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
-
- 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
- B60L2250/00—Driver interactions
- B60L2250/26—Driver interactions by pedal actuation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
This application provides the charge and discharge protecting method and devices of power battery; the power battery charge and discharge protecting method is a kind of active defense mode; the change rate of travel speed control signal in actively monitoring driving process; then, the corresponding charge-discharge electric power limits value of determination of the change rate of signal is controlled according to travel speed.Again convert charge-discharge electric power limits value to the torque limit value of motor in locomotive.The torque of final control motor is less than or equal to the torque limit value.According to the above process, the change rate of this method monitoring traveling control signal, and the torque limit value of the change rate adjustment motor according to traveling control signal, by the charge-discharge electric power limits value for controlling the output torque control power battery of motor, the generation of the phenomenon that prevent power battery from overcharging or over-discharge, improves the service life of power battery.
Description
Technical field
The invention belongs to battery technology field more particularly to a kind of power battery charge and discharge protecting method and devices.
Background technique
With wideling popularize for national new-energy automobile, new-energy automobile is increasingly appearing in the market, new energy
The common energy storage device of automobile is mainly power battery.
The charge and discharge process of power battery is controlled by control unit for vehicle (Vehicle control unit, VCU), can not
The size of autonomous control charge-discharge electric power.Common scheme is passive protection at present, i.e., power limit is carried out after actual power transfinites
System or drop Power Processing；Wherein, VCU carries out single limitation according to the power limit that battery BMS is issued, and electricity easily occurs
Pond overcharges or over-discharge phenomenon, the service life caused power battery damage, reduce power battery.
Summary of the invention
In view of this, the purpose of the present invention is to provide power battery charge and discharge protecting method and devices, to power battery
Active defense is carried out, prevents power battery from overcharging or over-discharge, improves the service life of power battery.
In a first aspect, being applied in locomotive, the method this application provides a kind of power battery charge and discharge protecting method
Include:
The change rate of the travel speed control signal during locomotive driving is obtained, the travel speed control signal includes
Acceleration signals and brake signal；
The charge-discharge electric power limits value of determining power battery corresponding with the travel speed control change rate of signal；
Convert the charge-discharge electric power limits value to the torque limit value of motor in the locomotive；
The torque of the motor is controlled less than or equal to the torque limit value, so that the power battery charge-discharge electric power
Less than or equal to the charge-discharge electric power limits value.
Optionally, the change rate for obtaining the travel speed control signal during locomotive driving, comprising:
The accelerator pedal position signal at current time during acquisition locomotive driving, and, according to the throttle at current time
The accelerator pedal position signal of pedal position signal and last moment obtains the accelerator pedal position signal change rate；
Alternatively,
The brake pedal position signal at current time during acquisition locomotive driving, and, according to the brake at current time
The brake pedal position signal of pedal position signal and last moment obtains the brake pedal position signal change rate.
Optionally, the charge and discharge of determination power battery corresponding with the travel speed control change rate of signal
Power limit, comprising:
When the accelerator pedal position signal change rate is greater than or equal to throttle change rate threshold value, determine that discharge power limits
Value processed is the maximum allowable discharge power of power battery；
When this is greater than or equal to electric discharge duration threshold using the electric discharge duration that the maximum allowable discharge power discharges
After value, determine that discharge power limits value is nominal discharge power.
Optionally, the charge and discharge of determination power battery corresponding with the travel speed control change rate of signal
Power limit, comprising:
When the accelerator pedal position signal change rate is less than the throttle change rate threshold value, determine that discharge power limits
Value is nominal discharge power.
Optionally, the charge and discharge of determination power battery corresponding with the travel speed control change rate of signal
Power limit, comprising:
When the brake pedal position signal change rate is greater than or equal to brake change rate threshold value, determine that charge power limits
Value processed is the maximum allowable charge power of power battery；
When this is greater than or equal to charging duration threshold using the charging duration that the maximum allowable charge power charges
After value, determine that charge power limits value is specified charge power.
Optionally, the charge and discharge of determination power battery corresponding with the travel speed control change rate of signal
Power limit, comprising:
When the brake pedal position signal change rate is less than brake change rate threshold value, determine that charge power limits value is
The specified charge power.
Optionally, the torque limit value for converting the charge-discharge electric power limits value in motor in the locomotive, packet
It includes:
Obtain the power consumption summation of each subsidiary engine in the locomotive；
Calculate the power difference between the charge-discharge electric power limits value and the power consumption summation；
According to the relation formula P=T*n/9549 of power and torque, the corresponding torque value of the power difference is calculated as institute
State the torque limit value of motor, wherein P is power, and T is torque, and n is the revolving speed of motor.
Second aspect, the application also provide a kind of power battery charging and discharging protection device, are applied in control unit for vehicle,
Described device includes:
Module is obtained, for obtaining the change rate of the travel speed control signal during locomotive driving, the traveling is fast
Degree control signal includes acceleration signals and brake signal；
Determining module, the charge and discharge for determining power battery corresponding with the travel speed control change rate of signal
Electrical power limits value；
Conversion module, for converting the charge-discharge electric power limits value to the torque limit value of motor in the locomotive；
Control module, the torque for controlling the motor is less than or equal to the torque limit value, so that the power
Battery charging and discharging power is less than or equal to the charge-discharge electric power limits value.
Optionally, the acquisition module, is specifically used for:
The accelerator pedal position signal at current time during acquisition locomotive driving, and, according to the throttle at current time
The accelerator pedal position signal of pedal position signal and last moment obtains the accelerator pedal position signal change rate；
Alternatively,
The brake pedal position signal at current time during acquisition locomotive driving, and, according to the brake at current time
The brake pedal position signal of pedal position signal and last moment obtains the brake pedal position signal change rate.
The third aspect, the application also provide a kind of control unit for vehicle, comprising: storage unit and processing unit, it is described to deposit
Program instruction is stored in storage unit, described program instruction realizes any possibility of first aspect when being executed by the processing unit
Implementation described in power battery charge and discharge protecting method.
Compared with prior art, above-mentioned technical proposal provided by the invention has the advantages that the power battery charge and discharge
Guard method is a kind of active defense mode, the change rate of the travel speed control signal in actively monitoring driving process, then,
The corresponding charge-discharge electric power limits value of determination of the change rate of signal is controlled according to travel speed.Again by charge-discharge electric power limits value
It is converted into the torque limit value of motor in locomotive.The torque of final control motor is less than or equal to the torque limit value.According to
The above process is it is found that this method monitoring traveling controls the change rate of signal, and adjusts electricity according to the change rate of traveling control signal
The torque limit value of machine, the charge-discharge electric power limits value of the output torque control power battery by controlling motor, to prevent
Power battery overcharges or generation the phenomenon that over-discharge, improves the service life of power battery.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of flow chart of power battery charge and discharge protecting method provided by the embodiments of the present application；
Fig. 2 is the flow chart of another power battery charge and discharge protecting method provided by the embodiments of the present application；
Fig. 3 is the flow chart of another power battery charge and discharge protecting method provided by the embodiments of the present application；
Fig. 4 is a kind of block diagram of power battery charging and discharging protection device provided by the embodiments of the present application.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Figure 1, a kind of flow chart of power battery charge and discharge protecting method of the embodiment of the present application, this method are shown
Applied in control unit for vehicle VCU, as shown in Figure 1, this method may comprise steps of:
S110 obtains the change rate of the travel speed control signal during locomotive driving.
The travel speed control signal includes acceleration signals and brake signal, wherein acceleration signals, that is, gas pedal position
Confidence number, brake signal, that is, brake pedal position signal.
In the process of moving, VCU acquires accelerator pedal position signal, brake pedal position signal to locomotive, and carries out suitably
Filtering processing.
Then, believed according to current time corresponding accelerator pedal position signal accelerator pedal position corresponding with last moment
Number obtain the change rate of accelerator pedal position signal；Similarly, according to the brake pedal position signal at current time and last moment
Brake pedal position signal obtain the change rate of brake pedal position signal.
The charge-discharge electric power of S120, determining power battery corresponding with the travel speed control change rate of signal limit
Value.
Corresponding charge-discharge electric power limits value is selected according to specific change rate, for example, selecting if change rate is bigger
Select maximum charge-discharge electric power limits value；If change rate is smaller, specified charge-discharge electric power limits value is selected.
In one embodiment of the application, the change rate threshold value of accelerator pedal position signal is preset, and brake is stepped on
The change rate threshold value of Board position signal controls power battery if change rate is greater than or equal to corresponding change rate threshold value with most
Big charge-discharge electric power carries out charge and discharge；If change rate is less than corresponding change rate threshold value, power battery is controlled with specified charge and discharge
Electrical power carries out charge and discharge.Wherein, change rate threshold value herein is positive number.
S130 converts charge-discharge electric power limits value to the torque limit value of motor in locomotive.
Power battery is passively to discharge, and the power released is consumed by energy-consuming parts such as motor, subsidiary engines in locomotive, because
This, needs to realize the limitation of the energy-consuming parts such as motor, subsidiary engine by VCU to the power limit of power battery.
After the charge-discharge electric power limits value for determining power battery, according to the relation formula between power and torque by charge and discharge
Electrical power limits value is converted into the output torque value of motor, i.e. torque limit value.
S140 controls the torque of motor less than or equal to torque limit value so that power battery charge-discharge electric power be less than or
Equal to charge-discharge electric power limits value.
The output torque for controlling motor is less than or equal to the torque limit value, so that it is small to meet power battery charge-discharge electric power
In or be equal to charge-discharge electric power limits value, avoid power battery from occurring overcharging or the phenomenon that over-discharge.
Power battery charge and discharge protecting method provided in this embodiment is a kind of active defense mode, actively the control of monitoring traveling
The change rate of signal processed, and the torque limit value of the change rate adjustment motor according to traveling control signal, pass through control motor
The charge-discharge electric power limits value of output torque control power battery prevents power battery from overcharging or generation the phenomenon that over-discharge, improves
Service life of power battery.
Fig. 2 is referred to, the flow chart of the embodiment of the present application another kind power battery charge and discharge protecting method, this reality are shown
Applying example will focus on the method introduced power battery during discharge and prevent over-discharge.As shown in Fig. 2, this method may include following
Step:
S210 obtains the accelerator pedal position signal at current time during locomotive driving.
During locomotive driving, VCU can acquire accelerator pedal position signal.
S220 is calculated according to the accelerator pedal position signal at current time and the accelerator pedal position signal of last moment
Obtain the change rate of accelerator pedal position signal.
For example, first calculating the accelerator pedal position signal at current time and the difference of the accelerator pedal position signal of last moment
Value, then, calculates the ratio of the accelerator pedal position signal at the difference and current time, obtains the change of accelerator pedal position signal
Rate.The change rate of the accelerator pedal position signal can be positive value or negative value.
S230, judges whether the change rate of the accelerator pedal position signal is greater than or equal to throttle change rate threshold value；If
It is then to execute S240；If it is not, then executing S260.
Throttle change rate threshold value is related to the performance parameter of battery, can set the throttle change rate threshold according to actual needs
Value.
S240, determination is discharged with the maximum allowable discharge power of power battery, and records the power battery with maximum
The electric discharge duration for allowing discharge power to discharge.
The change rate of accelerator pedal position signal is greater than or equal to throttle change rate threshold value, and it is biggish dynamic to show that locomotive has
Power demand is discharged using the maximum allowable discharge power control power battery of power battery in such cases.
Wherein, maximum allowable discharge power is a performance parameter of power battery, for example, the parameter goes out in power battery
It measures and is marked on nameplate when factory.
Meanwhile recording the electric discharge duration that power battery uses the electric discharge of maximum allowable discharge power.
S250, judges whether the electric discharge duration is greater than or equal to electric discharge duration threshold value, if it is, executing S260；If
It is no, then it returns and executes S240.
Whether the electric discharge duration that monitoring power battery is discharged with maximum allowable discharge power is more than electric discharge duration threshold value.
Duration threshold value of discharging is related to the self performance of power battery, for example, can be with maximum allowable electric discharge according to power battery
The working time that power discharges determines.
If the electric discharge duration with the electric discharge of maximum allowable discharge power is more than electric discharge duration threshold value, switches to and put with specified
Discharging electric power.
S260, determination are discharged with the nominal discharge power of power battery.
If the change rate of accelerator pedal position signal is less than throttle change rate threshold value, it is determined that discharge power limits value is
The nominal discharge power of power battery.
Wherein, nominal discharge power is a performance parameter of power battery, which measures when power battery dispatches from the factory
And it marks on nameplate.
S270 converts discharge power limits value to the torque limit value of motor.
Power battery is passively to discharge, and the power released is consumed by energy-consuming parts such as motor, subsidiary engines in locomotive, because
This, needs to realize the limitation of the energy-consuming parts such as motor, each subsidiary engine in locomotive by VCU to the power limit of power battery.
In addition to motor can also have various subsidiary engine consumption power during locomotive driving under actual conditions, therefore, it is necessary to right
The power consumption situation of each subsidiary engine is estimated.
PEAM=PDC+PEPS+PEAC+PAIR+PWRM(formula 1)
Wherein, in formula 1, PEAMThe sum of power, P are consumed for each subsidiary engineDCFor the power of DC/DC converter consumption, PEPS
For power-assisted steering pump power, PEACFor air compressor machine power, PAIRFor air-conditioning power, PWRMFor electricity defrosting, warm wind power；It is wherein each auxiliary
Operating voltage that the consumption performance number of machine can be fed back according to each subsidiary engine, electric current are calculated by P=UI.
The torque limit value T of motor is calculated according to formula 2MTLmt:
In formula 2, PLmtP when wherein discharging for discharge power limits valueLmtFor positive value, PEAMPower is consumed for each subsidiary engine
The sum of, n is motor speed.
Since the motor speed n measured under actual conditions can have fluctuation, if the n measured is directly directly substituted into formula
In 2, then the torque limit value T that is calculatedMTLmtAlso there can be corresponding fluctuation, finally easily cause the shake of vehicle, therefore
It needs to handle motor speed according to formula 3:
In formula 3, nActFor the motor actual speed measured, Δ n is motor speed segmentation step, and Δ n is according to motor reality
Tachometric survey precision determines that the higher Δ n of measurement accuracy is smaller, and measurement accuracy is lower, and Δ n is bigger.
S280, the output torque for controlling motor is less than or equal to the torque limit value, so that power battery discharge power is small
In or equal to discharge power limits value.
The output torque for controlling motor is less than or equal to above-mentioned torque limit value, in this way, the discharge power of power battery
Less than or equal to discharge power limits value.
Power battery charge and discharge protecting method is present embodiments provided, the change rate of accelerator pedal position signal is monitored, when
The change rate be more than throttle change rate threshold value after, determine power battery discharge power limits value be the maximum allowable of the battery put
Electrical power；Meanwhile the electric discharge duration discharged using maximum allowable discharge power is recorded, when the electric discharge duration is more than electric discharge
After long threshold value, it is switched to and is discharged with the nominal discharge power of the battery.If being less than throttle change rate threshold value, directly
It is discharged with the nominal discharge power of the battery.Such mode can make the discharge power of power battery reach the power of locomotive
Demand, it is also possible to prevent power battery overdischarge, this improves the service lifes of power battery.
Fig. 3 is referred to, the flow chart of another power battery charge and discharge protecting method of the embodiment of the present application, this reality are shown
It applies example and will focus on and introduce power battery during the charging process and prevent the method overcharged.As shown in figure 3, this method may include following
Step:
S310 obtains the brake pedal position signal at current time during locomotive driving.
During locomotive driving, VCU can acquire brake pedal position signal.
S320 is calculated according to the brake pedal position signal at current time and the brake pedal position signal of last moment
Obtain the change rate of brake pedal position signal.
For example, first calculating the brake pedal position signal at current time and the difference of the brake pedal position signal of last moment
Value, then, calculates the ratio of the brake pedal position signal at the difference and current time, obtains the change of brake pedal position signal
Rate.
S330, judges whether the change rate of the brake pedal position signal is greater than or equal to brake change rate threshold value；If
It is then to execute S340；If it is not, then executing S360.
Change rate threshold value of braking is related to the performance parameter of battery, can set the brake change rate threshold according to actual needs
Value.
S340 determines that charge power limits value is the maximum allowable charge power of power battery, and records the power battery
The charging duration to be charged with maximum allowable charge power.
If the change rate of normal danger signal is greater than or equal to brake change rate threshold value, show that locomotive has biggish system
Dynamic demand is charged using the maximum allowable charge power control power battery of power battery in such cases.
Wherein, maximum allowable charge power is a performance parameter of power battery, for example, the parameter goes out in power battery
It measures and is marked on nameplate when factory.
Meanwhile recording the charging duration that power battery uses the charging of maximum allowable charge power.
S350, judges whether the charging duration is greater than or equal to charging duration threshold value, if it is, executing S360；If
It is no, then it returns and executes S340.
Whether the charging duration that monitoring power battery is charged with maximum allowable charge power is more than charging duration threshold value.
Charging duration threshold value is related to the self performance of power battery, for example, can be with maximum allowable charging according to power battery
The working time that power charges determines.
If the charging duration with the charging of maximum allowable charge power is more than charging duration threshold value, switches to and filled with specified
Electrical power charging.
S360 determines that charge power limits value is specified charge power.
If the change rate of brake pedal position signal is less than brake change rate threshold value, it is determined that charge power limits value is
The specified charge power of power battery.
Wherein, specified charge power is a performance parameter of power battery, which measures when power battery dispatches from the factory
And it marks on nameplate.
S370 converts charge power limits value to the torque limit value of motor.
Power battery is passively to charge, and a part in power battery is by energy-consuming parts institutes such as motor, subsidiary engines in locomotive
Therefore consumption needs to realize the limitation of the energy-consuming parts such as motor, subsidiary engine by VCU to the power limit of power battery.
The power consumption situation of each subsidiary engine in locomotive is calculated first, in accordance with formula 1, that is, P is calculatedEAM；Then,
The torque limit value T of motor is calculated according to formula 2MTLmt；During for power battery charging, charge power limits value
PLmtFor negative value；The difference of the power consumption of the charge power limits value and each subsidiary engine is the final charge power of the power battery
Limits value, due to PLmtFor negative value so PLmtWith PEAMAbsolute difference be equal to PLmtAbsolute value and PEAMThe sum of absolute value.
I.e. | PLmt-PEAM|=| PLmt|+|PEAM|。
S380, control motor torque be less than or equal to the torque limit value so that power battery charging power be less than or
Equal to charge power limits value.
The torque for controlling motor is less than or equal to torque limit value obtained in S370, to make power battery charging power
Less than or equal to charge power limits value.
Power battery charge and discharge protecting method provided in this embodiment, monitors the situation of change of brake pedal position signal,
After change rate is more than brake change rate threshold value, determine that the charge power limits value of power battery is that the maximum allowable of the battery is filled
Electrical power；Meanwhile the charging duration to charge using maximum allowable charge power is recorded, when the charging duration is more than charging
After long threshold value, it is switched to and is charged with specified charge power.If brake change rate threshold value is less than, directly with the battery
Specified charge power charge.Such mode can make the charge power of power battery reach the braking requirement of locomotive, together
When can also prevent power battery overcharge, improve the service life of power battery.
Corresponding to above-mentioned power battery charge and discharge protecting embodiment of the method, present invention also provides power battery charge and discharge
Protective device embodiment.
Fig. 4 is referred to, a kind of block diagram of power battery charging and discharging protection device of the embodiment of the present application is shown, which answers
For in the control unit for vehicle VCU of vehicle, as shown in figure 4, the apparatus may include: obtain module 110, determining module 120,
Conversion module 130 and control module 140；
Module 110 is obtained, for obtaining the change rate of the travel speed control signal during locomotive driving.
The travel speed control signal includes acceleration signals and brake signal；In the process of moving, VCU acquisition is oily for locomotive
Door pedal position signal and brake pedal position signal, and carry out filtering processing appropriate, wherein accelerator pedal position signal is
Acceleration signals, brake pedal position signal, that is, brake signal.
The acquisition module is specifically used for when obtaining the change rate of accelerator pedal position signal: obtaining locomotive driving and works as in the process
The accelerator pedal position signal at preceding moment, and, according to the throttle of the accelerator pedal position signal at current time and last moment
Pedal position signal obtains the accelerator pedal position signal change rate；
For example, first calculating the accelerator pedal position signal at current time and the difference of the accelerator pedal position signal of last moment
Value, then, calculates the ratio of the accelerator pedal position signal at the difference and current time, obtains the change of accelerator pedal position signal
Rate.The change rate of the accelerator pedal position signal can be positive value or negative value.
The acquisition module is specifically used for when obtaining the change rate of brake pedal position signal: obtaining locomotive driving and works as in the process
The brake pedal position signal at preceding moment, and, according to the brake of the brake pedal position signal at current time and last moment
Pedal position signal obtains the brake pedal position signal change rate.
Determining module 120, for determining power battery corresponding with the travel speed control change rate of signal
Charge-discharge electric power limits value.
In one embodiment of the application, determining module 120 is according to the accelerator pedal position signal for obtaining module acquisition
Change rate determine the discharge power limits value of power battery, specific determination process is as follows:
Judge whether the change rate of accelerator pedal position signal is greater than or equal to throttle change rate threshold value, if it is greater than or wait
In, it is determined that discharge power limits value is the maximum allowable discharge power of the power battery；If it is less, determining discharge power
Limits value is the nominal discharge power of the power battery；
Wherein, it during being discharged using the maximum allowable discharge power of battery, needs to record and be permitted using maximum
Perhaps the electric discharge duration that discharge power discharges is switched to upon discharging after the long duration threshold value more than or equal to electric discharge with battery
Nominal discharge power discharge.
In another embodiment of the application, determining module 120 is believed according to the brake pedal position that module obtains is obtained
Number change rate determine the charge power limits value of power battery, specific determination process is as follows:
Judge the change rate of brake pedal position signal whether be greater than or equal to brake change rate threshold value, if it is greater than or wait
In, it is determined that charge power limits value is the maximum allowable charge power of the power battery；If it is less, determining charge power
Limits value is the specified charge power of the power battery.
Wherein, it during being charged using the maximum allowable charge power of battery, needs to record and be permitted using maximum
Perhaps the charging duration that charge power charges, it is long more than or equal to after charging duration threshold value when charging, it is switched to battery
Specified charge power charge.
Conversion module 130, for converting the charge-discharge electric power limits value to the torque limit of motor in the locomotive
Value.
Since power battery is passive charge and discharge, the power limit of power battery is needed through VCU to the electricity in locomotive
The limitation of the energy-consuming parts such as machine, each subsidiary engine is realized.Motor is converted by charge power limits value using above-mentioned formula 1 and formula 2
Output torque limits value, and, convert charge power limits value to the torque limit value of motor.
Control module 140, the torque for controlling the motor are less than or equal to the torque limit value, so that described dynamic
Power battery charging and discharging power is less than or equal to the charge-discharge electric power limits value.
The torque for the torque limit value control motor that control module is used to convert according to conversion module, to make power
The charge-discharge electric power of battery is no more than charge-discharge electric power limits value.
Power battery charging and discharging protection device provided in this embodiment is a kind of active defense mode, actively the control of monitoring traveling
The change rate of signal processed, and the torque limit value of the change rate adjustment motor according to traveling control signal, pass through control motor
The charge-discharge electric power limits value of output torque control power battery prevents power battery from overcharging or generation the phenomenon that over-discharge, improves
Service life of power battery.
It on the other hand, include that storage unit and processing are single present invention also provides a kind of control unit for vehicle VCU, the VCU
Member, wherein memory cell contains program instruction, and program instruction unit processed realizes any one above-mentioned reality when executing
The power battery charge and discharge protecting method of example offer is provided.
For the various method embodiments described above, for simple description, therefore, it is stated as a series of action combinations, but
Be those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because according to the present invention, certain
A little steps can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know that, it is retouched in specification
The embodiment stated belongs to preferred embodiment, and related actions and modules are not necessarily necessary for the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Step in each embodiment method of the application can be sequentially adjusted, merged and deleted according to actual needs.
Device in each embodiment of the application and the module in terminal and submodule can merge according to actual needs,
It divides and deletes.
In several embodiments provided herein, it should be understood that disclosed terminal, device and method, Ke Yitong
Other modes are crossed to realize.For example, terminal embodiment described above is only schematical, for example, module or submodule
Division, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple submodule or
Module may be combined or can be integrated into another module, or some features can be ignored or not executed.Another point is shown
The mutual coupling, direct-coupling or communication connection shown or discussed can be through some interfaces, between device or module
Coupling or communication connection are connect, can be electrical property, mechanical or other forms.
Module or submodule may or may not be physically separated as illustrated by the separation member, as mould
The component of block or submodule may or may not be physical module or submodule, it can and it is in one place, or
It may be distributed on multiple network modules or submodule.Some or all of mould therein can be selected according to the actual needs
Block or submodule achieve the purpose of the solution of this embodiment.
In addition, each functional module or submodule in each embodiment of the application can integrate in a processing module
In, it is also possible to modules or submodule physically exists alone, it can also be integrated with two or more modules or submodule
In a module.Above-mentioned integrated module or submodule both can take the form of hardware realization, can also use software function
Energy module or the form of submodule are realized.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of power battery charge and discharge protecting method is applied in locomotive, which is characterized in that the described method includes:
The change rate of the travel speed control signal during locomotive driving is obtained, the travel speed control signal includes accelerating
Signal and brake signal；
The charge-discharge electric power limits value of determining power battery corresponding with the travel speed control change rate of signal；
Convert the charge-discharge electric power limits value to the torque limit value of motor in the locomotive；
The torque of the motor is controlled less than or equal to the torque limit value, so that the power battery charge-discharge electric power is less than
Or it is equal to the charge-discharge electric power limits value.
2. the method according to claim 1, wherein the travel speed control obtained during locomotive driving
The change rate of signal, comprising:
The accelerator pedal position signal at current time during acquisition locomotive driving, and, according to the gas pedal at current time
The accelerator pedal position signal of position signal and last moment obtains the accelerator pedal position signal change rate；
Alternatively,
The brake pedal position signal at current time during acquisition locomotive driving, and, according to the brake pedal at current time
The brake pedal position signal of position signal and last moment obtains the brake pedal position signal change rate.
3. according to the method described in claim 2, it is characterized in that, the variation of the determination and travel speed control signal
The charge-discharge electric power limits value of the corresponding power battery of rate, comprising:
When the accelerator pedal position signal change rate is greater than or equal to throttle change rate threshold value, discharge power limits value is determined
For the maximum allowable discharge power of power battery；
After this is greater than or equal to electric discharge duration threshold value using the electric discharge duration that the maximum allowable discharge power discharges,
Determine that discharge power limits value is nominal discharge power.
4. according to the method described in claim 3, it is characterized in that, the variation of the determination and travel speed control signal
The charge-discharge electric power limits value of the corresponding power battery of rate, comprising:
When the accelerator pedal position signal change rate is less than the throttle change rate threshold value, determine that discharge power limits value is
Nominal discharge power.
5. according to the method described in claim 2, it is characterized in that, the variation of the determination and travel speed control signal
The charge-discharge electric power limits value of the corresponding power battery of rate, comprising:
When the brake pedal position signal change rate is greater than or equal to brake change rate threshold value, charge power limits value is determined
For the maximum allowable charge power of power battery；
After this is greater than or equal to charging duration threshold value using the charging duration that the maximum allowable charge power charges,
Determine that charge power limits value is specified charge power.
6. according to the method described in claim 5, it is characterized in that, the variation of the determination and travel speed control signal
The charge-discharge electric power limits value of the corresponding power battery of rate, comprising:
When the brake pedal position signal change rate is less than brake change rate threshold value, determine that charge power limits value is described
Specified charge power.
7. the method according to claim 1, wherein it is described convert the charge-discharge electric power limits value to it is described
The torque limit value of motor in locomotive, comprising:
Obtain the power consumption summation of each subsidiary engine in the locomotive；
Calculate the power difference between the charge-discharge electric power limits value and the power consumption summation；
According to the relation formula P=T*n/9549 of power and torque, calculating the corresponding torque value of the power difference is the electricity
The torque limit value of machine, wherein P is power, and T is torque, and n is the revolving speed of motor.
8. a kind of power battery charging and discharging protection device, which is characterized in that be applied in control unit for vehicle, described device packet
It includes:
Module is obtained, for obtaining the change rate of the travel speed control signal during locomotive driving, the travel speed control
Signal processed includes acceleration signals and brake signal；
Determining module, the charge and discharge electric work for determining power battery corresponding with the travel speed control change rate of signal
Rate limits value；
Conversion module, for converting the charge-discharge electric power limits value to the torque limit value of motor in the locomotive；
Control module, the torque for controlling the motor is less than or equal to the torque limit value, so that the power battery
Charge-discharge electric power is less than or equal to the charge-discharge electric power limits value.
9. according to the method described in claim 8, it is characterized in that, the acquisition module, is specifically used for:
The accelerator pedal position signal at current time during acquisition locomotive driving, and, according to the gas pedal at current time
The accelerator pedal position signal of position signal and last moment obtains the accelerator pedal position signal change rate；
Alternatively,
The brake pedal position signal at current time during acquisition locomotive driving, and, according to the brake pedal at current time
The brake pedal position signal of position signal and last moment obtains the brake pedal position signal change rate.
10. a kind of control unit for vehicle characterized by comprising storage unit and processing unit store in the storage unit
There is program instruction, described program instruction realizes power battery charge and discharge described in claim 1-7 when being executed by the processing unit
Electric protection method.
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| CN201811123672.6A CN109334508B (en) | 2018-09-26 | 2018-09-26 | Power battery charging and discharging protection method and device |
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| CN109334508B (en) | 2020-09-29 |
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