CN109774491A - Torque control method, system, vehicle control device and the electric car of electric car - Google Patents
Torque control method, system, vehicle control device and the electric car of electric car Download PDFInfo
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- CN109774491A CN109774491A CN201711102202.7A CN201711102202A CN109774491A CN 109774491 A CN109774491 A CN 109774491A CN 201711102202 A CN201711102202 A CN 201711102202A CN 109774491 A CN109774491 A CN 109774491A
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- 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
Abstract
The present invention proposes torque control method, system, vehicle control device and the electric car of a kind of electric car, method includes the following steps: obtaining the current status information of vehicle, the current status information of vehicle is included at least: the current maximum allowable output torque of the current SOC of battery, battery Current Temperatures, battery present discharge electric current, motor；Judge the current SOC of battery whether less than the first preset value；If it is, obtaining battery currently maximum allowable discharge current according to the current SOC of battery and battery Current Temperatures；According to battery present discharge electric current and battery, currently maximum allowable discharge current determines the final output torque of motor.The present invention can effectively prevent the battery over-discharge phenomenon occurred when battery SOC is lower, improve vehicle drive performance and battery life.
Description
Technical field
The present invention relates to automobile technical field, in particular to a kind of torque control method of electric car, system, vehicle control
Device and electric car processed.
Background technique
The load of power battery mainly include electric machine controller (Moter Control Unit, MCU), compressor of air conditioner,
PTC (Positive Temperature Coefficient, thermistor), DCDC, the wherein power of compressor of air conditioner, PTC
It is to change as vehicle interior temperature changes, is uncertain factor；The power of DCDC is related with the unlatching situation of low pressure attachment, can
It is calculated by the voltage and electric current of real-time monitoring DCDC；And the power of MCU and revolving speed, torque and the system effectiveness of motor
Related therefore current scheme mainly passes through entire car controller (Vehicle control unit, VCU) limiting motor and works as forward
Output torque under speed, limits the power of MCU, and then prevent battery over-discharge.
However, the characteristic according to battery is learnt, the service voltage of battery is with battery SOC (State of Charge, lotus
Electricity condition) it reduces and reduces, that is to say, that MCU can not work always under rated voltage, when service voltage reduces, motor
System effectiveness can reduce, if efficiency calculation when still being worked under rated voltage with MCU, cannot accurately carry out to requested torque
Limitation causes MCU real work power to be greater than the maximum allowable discharge power of MCU, battery over-current phenomenon avoidance occurs, to influence battery
Service life.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, this method can have an object of the present invention is to provide a kind of torque control method of electric car
Effect prevents the battery over-discharge phenomenon occurred when battery SOC is lower, improves vehicle drive performance and battery life.
It is another object of the present invention to the torque control systems for proposing a kind of electric car.
Third object of the present invention is to propose a vehicle control device.
Fourth object of the present invention is to propose a kind of electric car.
To achieve the goals above, the embodiment of first aspect present invention proposes a kind of moment of torsion control side of electric car
Method, comprising the following steps: obtain the current status information of vehicle, the current status information of the vehicle includes at least: battery is worked as
The current maximum allowable output torque of preceding SOC, battery Current Temperatures, battery present discharge electric current, motor；Judge that the battery is current
Whether SOC is less than the first preset value；If it is, obtaining battery according to the current SOC of the battery and the battery Current Temperatures
Current maximum allowable discharge current；According to the battery present discharge electric current and the battery, currently maximum allowable discharge current is true
Determine the final output torque limit of motor, and the output torque of motor is limited according to the final output torque limit.
The torque control method of electric car according to an embodiment of the present invention passes through the current SOC of battery and the first preset value
It is compared the accelerating ability for preventing influencing vehicle under normal circumstances to determine whether need to carry out current protection；And in battery
When currently SOC is lower, current protection is carried out, Motor torque is rationally limited before there is overcurrent, to avoid out
While existing over-current phenomenon avoidance, the influence to power performance is utmostly reduced, to improve vehicle drive performance and battery
Service life.
In addition, the torque control method of electric car according to the above embodiment of the present invention can also have it is following additional
Technical characteristic:
In some instances, described according to the current maximum allowable electric discharge electricity of the battery present discharge electric current and the battery
The final output torque limit for determining motor is flowed, further comprises: it is described to judge whether the battery present discharge electric current is greater than
The product of battery currently maximum allowable discharge current and the first preset ratio, wherein first preset ratio is less than 1；If
It is, then using the product of the motor currently maximum allowable output torque and the second preset ratio as the final output of the motor
Torque limit, wherein first preset ratio is greater than second preset ratio.
In some instances, further includes: if the battery present discharge electric current is less than or equal to the battery currently most
The big product for allowing discharge current and the first preset ratio, then by the motor, currently maximum allowable output torque continues as institute
State the final output torque limit of motor.
In some instances, institute is obtained by inquiring the preset maximum allowable discharge current matrix table of temperature-SOC- battery
State battery currently maximum allowable discharge current, wherein include in the maximum allowable discharge current matrix table of temperature-SOC- battery
Mapping relations between battery SOC, battery temperature and the maximum allowable discharge current of battery.
To achieve the goals above, the embodiment of second aspect of the present invention proposes a kind of moment of torsion control system of electric car
System, comprising: obtain module, for obtaining the current status information of vehicle, the current status information of the vehicle is included at least: electricity
The current maximum allowable output torque of the current SOC in pond, battery Current Temperatures, battery present discharge electric current, motor；Judgment module is used
In judging the current SOC of the battery whether less than the first preset value；Computing module, for being less than institute as the current SOC of the battery
When stating the first preset value, battery currently maximum allowable electric discharge is obtained according to the current SOC of the battery and the battery Current Temperatures
Electric current；Control module, for currently maximum allowable discharge current to determine according to the battery present discharge electric current and the battery
The final output torque limit of motor, and the output torque of motor is limited according to the final output torque limit.
The torque control system of electric car according to an embodiment of the present invention passes through the current SOC of battery and the first preset value
It is compared the accelerating ability for preventing influencing vehicle under normal circumstances to determine whether need to carry out current protection；And in battery
When currently SOC is lower, current protection is carried out, Motor torque is rationally limited before there is overcurrent, to avoid out
While existing over-current phenomenon avoidance, the influence to power performance is utmostly reduced, to improve vehicle drive performance and battery
Service life.
In addition, the torque control system of electric car according to the above embodiment of the present invention can also have it is following additional
Technical characteristic:
In some instances, the control module is for judging whether the battery present discharge electric current is greater than the battery
The product of current maximum allowable discharge current and the first preset ratio, and when the battery present discharge electric current is greater than the battery
When the product of current maximum allowable discharge current and the first preset ratio, by the current maximum allowable output torque and the of the motor
Final output torque limit of the product of two preset ratios as the motor, wherein first preset ratio is less than 1, institute
The first preset ratio is stated greater than second preset ratio.
In some instances, the control module is also used to be less than or equal to the electricity when the battery present discharge electric current
Pond currently the product of maximum allowable discharge current and the first preset ratio when, by the motor currently maximum allowable output torque after
The continuous final output torque limit as the motor.
In some instances, institute is obtained by inquiring the preset maximum allowable discharge current matrix table of temperature-SOC- battery
State battery currently maximum allowable discharge current, wherein include in the maximum allowable discharge current matrix table of temperature-SOC- battery
Mapping relations between battery SOC, battery temperature and the maximum allowable discharge current of battery.
To achieve the goals above, the embodiment of third aspect present invention discloses a kind of vehicle control device, including above-mentioned
The torque control system of electric car described in second aspect embodiment.
Vehicle control device according to an embodiment of the present invention is compared to sentence by the current SOC of battery with the first preset value
It is disconnected whether to need to carry out current protection, prevent the accelerating ability for influencing vehicle under normal circumstances；And it is lower in the current SOC of battery
When, current protection is carried out, Motor torque is rationally limited before there is overcurrent, thus avoiding the occurrence of over-current phenomenon avoidance
Meanwhile influence to power performance is utmostly reduced, to improve vehicle drive performance and battery life.
To achieve the goals above, the embodiment of fourth aspect present invention discloses a kind of electric car, including the present invention
Vehicle control device described in above-mentioned third aspect embodiment.
Electric car according to an embodiment of the present invention can effectively prevent the battery over-discharge occurred when battery SOC is lower existing
As improving vehicle drive performance and battery life.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart of the torque control method of electric car according to an embodiment of the invention；
Fig. 2 is the detail flowchart of the torque control method of electric car accord to a specific embodiment of that present invention；
Fig. 3 is the structural block diagram of the torque control system of electric car according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Torque control method, the system, vehicle control of electric car according to an embodiment of the present invention are described below in conjunction with attached drawing
Device and electric car processed.
Fig. 1 is the flow chart of the torque control method of electric car according to an embodiment of the invention.As shown in Figure 1,
Method includes the following steps:
Step S1: obtaining the current status information of vehicle, and the current status information of vehicle includes at least: the current SOC of battery,
Currently maximum allowable output torque (is denoted as T for battery Current Temperatures, battery present discharge electric current (being denoted as I), motormax)。
Step S2: judge the current SOC of battery whether less than the first preset value.Corresponding first preset value is battery over-discharge
That is, when SOC is less than the first preset value battery over-discharge can then occur for SOC limiting value, when SOC is greater than or equal to the first preset value, then
Battery over-discharge will not occur.
Step S3: if it is, obtaining battery currently maximum allowable electric discharge according to the current SOC of battery and battery Current Temperatures
Electric current.In other words, when the current SOC of battery is less than the first preset value, i.e., when battery over-discharge can occur, according to the current SOC of battery
Battery currently maximum allowable discharge current is obtained with battery Current Temperatures, such as is denoted as Imax。
Specifically, in one embodiment of the invention, by inquiring the preset maximum allowable electric discharge of temperature-SOC- battery
Current matrix table obtains battery currently maximum allowable discharge current, wherein the maximum allowable discharge current matrix of temperature-SOC- battery
It include the mapping relations between battery SOC, battery temperature and the maximum allowable discharge current of battery in table.In other words, in the temperature
In the maximum allowable discharge current matrix table of degree-SOC- battery, it can be inquired by the current SOC of input battery and battery Current Temperatures
To the current maximum allowable discharge current I of corresponding batterymax。
Step S4: according to the current maximum allowable discharge current I of battery present discharge electric current I and batterymaxDetermine motor most
Whole output torque limit value (being denoted as T), and limited according to output torque of the final output torque limit T to motor.I.e. in electricity
Pond rationally limits Motor torque before there is overcurrent, to prevent battery over-current phenomenon avoidance, thus influence driving performance with
And battery life.
Specifically, in step s 4, according to the current maximum allowable discharge current I of battery present discharge electric current I and batterymax
The final output torque limit T for determining motor further comprises: it is current to judge whether battery present discharge electric current I is greater than battery
Maximum allowable discharge current ImaxWith the product I of the first preset ratio amax* a, wherein a < 1；If it is, currently most by motor
It is big to allow output torque TmaxWith the product T of the second preset ratio bmax* final output torque limit T of the b as motor, wherein
First preset ratio a is greater than the second preset ratio b.Further, if when judging that battery present discharge electric current I is less than or equal to
The current maximum allowable discharge current I of batterymaxWith the product I of the first preset ratio amax* a, then it is motor is current maximum allowable defeated
Torque T outmaxContinue the final output torque limit T as motor.It should be noted that the principle of operation of the above operation is based on
T*n/9550=U*I/1000, since moment U and n is considered as constant, I and T are grade ratio relationship, wherein T represents torque, n
Represent revolving speed.
In one embodiment of the invention, upon step s 2, further includes: if it is determined that the current SOC of battery be greater than or
Equal to the first preset value, i.e. over-current phenomenon avoidance will not occur for battery, then by the current maximum allowable output torque T of motormaxContinue conduct
The final output torque limit T of motor.
To sum up, the torque control method of electric car according to an embodiment of the present invention, it is pre- by battery current SOC and first
If value is compared the accelerating ability for preventing influencing vehicle under normal circumstances to determine whether need to carry out current protection；And
When the current SOC of battery is lower, current protection is carried out, Motor torque is rationally limited before there is overcurrent, thus keeping away
While exempting to occur over-current phenomenon avoidance, utmostly reduce the influence to power performance, thus improve vehicle drive performance and
Battery life.
For the ease of more fully understand the above embodiment of the present invention electric car torque control method, below in conjunction with attached
Figure and specific embodiment carry out description specific in detail to this method.
In the present embodiment, as shown in Fig. 2, this method specifically includes the following steps:
Step 1: obtaining the current status information of vehicle, for example, the current SOC of battery, battery Current Temperatures, battery are worked as
The current maximum allowable output torque T of preceding discharge current I, motormax。
Step 2: judging the current SOC of battery whether less than 20% (i.e. the first preset value).If the current SOC of battery is greater than or waits
In 20% (herein 20% namely first preset value be denoted as scalar quantity A, corresponding is the limiting value of the SOC of over-discharge), then hold
Row step 6；If the current SOC of battery thens follow the steps 3 less than 20%.
Step 3: maximum allowable according to the current SOC value of battery and the preset temperature-SOC- battery of battery Current Temperatures inquiry
Discharge current matrix table map obtains the corresponding maximum allowable discharge current I of battery under current statemax。
Step 4: judging whether battery present discharge electric current I is greater than the maximum allowable discharge current I of batterymax95% (95%
That is the first preset ratio a, maximum allowable discharge current Imax95% i.e. maximum allowable discharge current ImaxWith the first preset ratio a
Product, such as be denoted as scalar quantity B, corresponding is the size of electric current, such as maximum allowed current 10A, and there are also a practical electricity
Stream, judgement how much be it is close, judge the condition of electric current), if I be less than or equal to Imax* 95%, 6 are thened follow the steps, if I is greater than
Imax* 95% thens follow the steps 5.
Step 5:Tmax=Tmax* 90% (90% i.e. the second preset ratio b, Tmax* 90% i.e. maximum allowable discharge current Imax
With the product of the second preset ratio b, such as it is denoted as scalar quantity C, corresponding is the correction factor of output torque), in other words,
By the product T of battery currently maximum allowable discharge current and the second preset ratiomaxThe * 90% final output torque as motor
Limit value.This is because T n/9550=U I/1000 (T represents torque, and n represents revolving speed) moment U, n be considered as it is constant, so I and
T be etc. compare relationship.
Step 6:Tmax=Tmax.In other words, by the current maximum allowable output torque T of motormaxContinue as motor most
Whole output torque limit value.
Step 7: output Tmax.That is the final output torque limit of output motor, and pass through the final output torque limit pair
The output torque of motor is limited, to prevent hair from rising over-current phenomenon avoidance, improves battery and vehicle driving performance.
Further, in the present embodiment, in above calculating and control process, it is related to three scalar quantities A, B, C,
These three amounts are variant because of the battery that different automobile types are matched and electric system difference, need to be verified and obtained on vehicle
To specific calibration value.Optional test method is as follows:
1) scalar quantity A is set as 0, is tested respectively when sample car SOC is 30%, 20%, 15%, 10%, 5%, sample
Vehicle accelerates sample car by static starting, rapid stepping on accelerator pedal to 100%, until reaching max. speed, during record test
The power of battery, electric current, voltage, SOC and motor speed, the information such as torque and speed.
2) being analyzed according to the data of step 1) will appear battery over-current phenomenon avoidance when SOC suddenly accelerates lower than how many when,
This value is set as scalar quantity A；Battery current variation tendency before occurring over-current phenomenon avoidance according to battery determines suitable scalar quantity
B。
3) assignment is carried out to scalar quantity C and is carried out at different SOC anxious add in the case where step 2) determines scalar quantity A, B
Speed test reduces scalar quantity C (declining by 5% gradient) and repeats test until not if battery over-current phenomenon avoidance still occurs
Battery over-current phenomenon avoidance occurs.
Scalar quantity validation test record sheet during specific test is as shown in table 1 below.
Table 1
The torque control method of electric car according to an embodiment of the present invention passes through the current SOC of battery and calibration value A (the
One preset value) it is compared the accelerating ability for preventing influencing vehicle under normal circumstances to determine whether need to carry out current protection；
And when the current SOC of battery is lower, current protection is carried out, Motor torque is rationally limited before there is overcurrent, thus
While avoiding the occurrence of over-current phenomenon avoidance, the influence to power performance is utmostly reduced, to improve drivability
Energy and battery life.
Further embodiment of the present invention also proposed a kind of torque control system of electric car.
Fig. 3 is the structural block diagram of the torque control system of electric car according to an embodiment of the invention.Such as Fig. 3 institute
Show, the torque control system 100 of the electric car includes: to obtain module 110, judgment module 120, computing module 130 and control
Module 140.
Wherein, module 110 is obtained for obtaining the current status information of vehicle, and the current status information of vehicle is at least wrapped
It includes: the current maximum allowable output torque of the current SOC of battery, battery Current Temperatures, battery present discharge electric current (being denoted as I), motor
(it is denoted as Tmax)。
Whether judgment module 120 is for judging the current SOC of battery less than the first preset value.Corresponding first preset value is electricity
That is, when SOC is less than the first preset value battery over-discharge can then occur for the SOC limiting value of pond over-discharge, when SOC is greater than or equal to first
Battery over-discharge will not then occur for preset value.
Computing module 130 is used for when the current SOC of battery is less than the first preset value, is worked as according to the current SOC of battery with battery
Preceding temperature obtains battery currently maximum allowable discharge current.In other words, work as the current SOC of battery less than the first preset value, i.e., can
When battery over-discharge occurs, battery currently maximum allowable discharge current is obtained according to the current SOC of battery and battery Current Temperatures, such as
It is denoted as Imax。
Specifically, in one embodiment of the invention, by inquiring the preset maximum allowable electric discharge of temperature-SOC- battery
Current matrix table obtains battery currently maximum allowable discharge current, wherein the maximum allowable discharge current matrix of temperature-SOC- battery
It include the mapping relations between battery SOC, battery temperature and the maximum allowable discharge current of battery in table.In other words, in the temperature
In the maximum allowable discharge current matrix table of degree-SOC- battery, it can be inquired by the current SOC of input battery and battery Current Temperatures
To the current maximum allowable discharge current I of corresponding batterymax。
Control module 140 is used for according to the current maximum allowable discharge current I of battery present discharge electric current I and batterymaxIt determines
The final output torque limit (being denoted as T) of motor, and limited according to output torque of the final output torque limit T to motor
System.Motor torque is rationally limited before overcurrent occurs in battery, to prevent battery over-current phenomenon avoidance, to influence to drive
Sail performance and battery life.
Specifically, control module 140 is for judging whether battery present discharge electric current I is greater than that battery is current maximum allowable to be put
Electric current ImaxWith the product I of the first preset ratio amax* a, wherein a < 1, and when battery present discharge electric current I works as greater than battery
Preceding maximum allowable discharge current ImaxWith the product I of the first preset ratio amax* when a, by the current maximum allowable output torque of motor
TmaxWith the product T of the second preset ratio bmax* final output torque limit T of the b as motor, wherein the first preset ratio a is big
In the second preset ratio b.Further, control module 140 is also used to work as battery present discharge electric current I less than or equal to battery
Preceding maximum allowable discharge current ImaxWith the product I of the first preset ratio amax* when a, by the current maximum allowable output torque of motor
TmaxContinue the final output torque limit T as motor.It should be noted that the principle of operation of the above operation is based on T*n/
9550=U*I/1000, since moment U and n is considered as constant, I and T are grade ratio relationship, wherein T represents torque, and n is represented
Revolving speed.
In one embodiment of the invention, control module (140) is also used to be greater than or equal to first as the current SOC of battery
When over-current phenomenon avoidance will not occur for preset value, i.e. battery, by the current maximum allowable output torque T of motormaxContinue as motor most
Whole output torque limit value.
It should be noted that the specific implementation of the torque control system of the electric car of the embodiment of the present invention and this hair
The specific implementation of the torque control method of the electric car of bright embodiment is similar, specifically refers to the description of method part,
In order to reduce redundancy, details are not described herein again.
The torque control system of electric car according to an embodiment of the present invention passes through the current SOC of battery and the first preset value
It is compared the accelerating ability for preventing influencing vehicle under normal circumstances to determine whether need to carry out current protection；And in battery
When currently SOC is lower, current protection is carried out, Motor torque is rationally limited before there is overcurrent, to avoid out
While existing over-current phenomenon avoidance, the influence to power performance is utmostly reduced, to improve vehicle drive performance and battery
Service life.
Further embodiment of the present invention additionally provides a kind of vehicle control device.The vehicle control device includes that the present invention is above-mentioned
The torque control system of electric car described in any one embodiment.
Vehicle control device according to an embodiment of the present invention is compared to sentence by the current SOC of battery with the first preset value
It is disconnected whether to need to carry out current protection, prevent the accelerating ability for influencing vehicle under normal circumstances；And it is lower in the current SOC of battery
When, current protection is carried out, Motor torque is rationally limited before there is overcurrent, thus avoiding the occurrence of over-current phenomenon avoidance
Meanwhile influence to power performance is utmostly reduced, to improve vehicle drive performance and battery life.
Further embodiment of the present invention additionally provides a kind of electric car.The electric car includes that the present invention is above-mentioned any
Vehicle control device described in one embodiment.
Electric car according to an embodiment of the present invention can effectively prevent the battery over-discharge occurred when battery SOC is lower existing
As improving vehicle drive performance and battery life.
In addition, electric car according to an embodiment of the present invention other compositions and effect for this field ordinary skill
All be for personnel it is known, in order to reduce redundancy, do not repeat them here.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (10)
1. a kind of torque control method of electric car, which comprises the following steps:
The current status information of vehicle is obtained, the current status information of the vehicle includes at least: the current SOC of battery, battery are worked as
The current maximum allowable output torque of preceding temperature, battery present discharge electric current, motor；
Judge the current SOC of the battery whether less than the first preset value；
If it is, obtaining the current maximum allowable electric discharge electricity of battery according to the current SOC of the battery and the battery Current Temperatures
Stream；
According to the battery present discharge electric current and the battery, currently maximum allowable discharge current determines the final output of motor
Torque limit, and the output torque of motor is limited according to the final output torque limit.
2. the torque control method of electric car according to claim 1, which is characterized in that described to be worked as according to the battery
Currently maximum allowable discharge current determines the final output torque limit of motor for preceding discharge current and the battery, further wraps
It includes:
Judge whether the battery present discharge electric current is greater than the battery currently maximum allowable discharge current and the first default ratio
The product of example, wherein first preset ratio is less than 1；
If it is, using the product of the motor currently maximum allowable output torque and the second preset ratio as the motor
Final output torque limit, wherein first preset ratio is greater than second preset ratio.
3. the torque control method of electric car according to claim 2, which is characterized in that further include:
If the battery present discharge electric current is less than or equal to the battery, currently maximum allowable discharge current and first is preset
The product of ratio, then by the motor, currently maximum allowable output torque continues to limit as the final output torque of the motor
Value.
4. the torque control method of electric car according to claim 1, which is characterized in that by inquiring preset temperature
The maximum allowable discharge current matrix table of degree-SOC- battery obtains the battery currently maximum allowable discharge current, wherein the temperature
It include battery SOC, battery temperature and the maximum allowable discharge current of battery in the maximum allowable discharge current matrix table of degree-SOC- battery
Between mapping relations.
5. a kind of torque control system of electric car characterized by comprising
It obtains module (110), for obtaining the current status information of vehicle, the current status information of the vehicle is included at least:
The current maximum allowable output torque of the current SOC of battery, battery Current Temperatures, battery present discharge electric current, motor；
Judgment module (120), for judging the current SOC of the battery whether less than the first preset value；
Computing module (130) is used for when the current SOC of the battery is less than first preset value, current according to the battery
SOC and the battery Current Temperatures obtain battery currently maximum allowable discharge current；
Control module (140), for according to the current maximum allowable discharge current of the battery present discharge electric current and the battery
It determines the final output torque limit of motor, and the output torque of motor is limited according to the final output torque limit
System.
6. the torque control system of electric car according to claim 5, which is characterized in that the control module (140)
For judging whether the battery present discharge electric current is greater than the battery currently maximum allowable discharge current and the first default ratio
The product of example, and when the battery present discharge electric current is greater than the battery currently maximum allowable discharge current and the first default ratio
When the product of example, most using the product of the motor currently maximum allowable output torque and the second preset ratio as the motor
Whole output torque limit value, wherein for first preset ratio less than 1, first preset ratio is greater than the described second default ratio
Example.
7. the torque control system of electric car according to claim 6, which is characterized in that the control module (140)
It is also used to when the battery present discharge electric current less than or equal to the battery, currently preset by maximum allowable discharge current and first
When the product of ratio, by the motor, currently maximum allowable output torque continues to limit as the final output torque of the motor
Value.
8. the torque control system of electric car according to claim 5, which is characterized in that by inquiring preset temperature
The maximum allowable discharge current matrix table of degree-SOC- battery obtains the battery currently maximum allowable discharge current, wherein the temperature
It include battery SOC, battery temperature and the maximum allowable discharge current of battery in the maximum allowable discharge current matrix table of degree-SOC- battery
Between mapping relations.
9. a kind of vehicle control device, which is characterized in that the torque control including such as described in any item electric cars of claim 5-8
System processed.
10. a kind of electric car, which is characterized in that including vehicle control device as claimed in claim 9.
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| CN201711102202.7A CN109774491A (en) | 2017-11-10 | 2017-11-10 | Torque control method, system, vehicle control device and the electric car of electric car |
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| CN110341495A (en) * | 2019-06-11 | 2019-10-18 | 汉腾汽车有限公司 | A kind of electricity drives torque control method and its system |
| CN111959279A (en) * | 2020-07-24 | 2020-11-20 | 苏州汇川联合动力系统有限公司 | Motor controller bus current control method, motor controller and storage medium |
| CN112793468A (en) * | 2020-12-31 | 2021-05-14 | 江铃汽车股份有限公司 | Battery charging and discharging protection method, system, storage medium and equipment |
| CN113147403A (en) * | 2021-04-08 | 2021-07-23 | 潍柴动力股份有限公司 | Vehicle, battery under-voltage protection system and method |
| CN113291204A (en) * | 2021-04-13 | 2021-08-24 | 北汽福田汽车股份有限公司 | Electric automobile and battery discharge protection method and device thereof |
| CN113386622A (en) * | 2021-06-29 | 2021-09-14 | 摩拜(北京)信息技术有限公司 | Vehicle control method and device and vehicle |
| CN117465222A (en) * | 2023-12-25 | 2024-01-30 | 合众新能源汽车股份有限公司 | Fault early warning method and fault early warning system of power battery |
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