CN108909456A - Control method, device, storage medium and the electric vehicle of electric vehicle - Google Patents
Control method, device, storage medium and the electric vehicle of electric vehicle Download PDFInfo
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- CN108909456A CN108909456A CN201810708868.5A CN201810708868A CN108909456A CN 108909456 A CN108909456 A CN 108909456A CN 201810708868 A CN201810708868 A CN 201810708868A CN 108909456 A CN108909456 A CN 108909456A
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Life Sciences & Earth Sciences (AREA)
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- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This disclosure relates to a kind of control method of electric vehicle, device, storage medium and electric vehicle.The method includes：When the electric vehicle when driving, obtain state-of-charge, temperature and the health status of power battery；The permission discharge power of the power battery is determined according to the state-of-charge of the power battery, temperature and health status；The operation of the electric vehicle is controlled according to the permission discharge power.In this way, the cycle life of power battery is higher when electric vehicle is run according to the permission discharge power that this method determines, the safety of electric vehicle traveling is higher.
Description
Technical field
This disclosure relates to field of vehicle control, and in particular, to a kind of control method of electric vehicle, device, storage are situated between
Matter and electric vehicle.
Background technique
Power resources of the electric vehicle using power battery as vehicle, compared to fuel combustion vehicle, clean energy, discharge is dirty
Contaminate it is small, it is more and more favored by the majority of users.
The permission discharge power of power battery affects the dynamic property of vehicle driving in electric vehicle, and control strategy influences
The safety of the cycle life of power battery, vehicle driving.The permission discharge power of usual power battery is by power battery
State-of-charge (State of Charge, SOC) and the temperature of power battery determine.
Summary of the invention
Purpose of this disclosure is to provide control method, device, storage medium and the electricity of a kind of simple and practical electric vehicle
Motor-car.
To achieve the goals above, the disclosure provides a kind of control method of electric vehicle.The method includes：When described
Electric vehicle when driving, obtains state-of-charge, temperature and the health status of power battery；According to the charged of the power battery
State, temperature and health status determine the permission discharge power of the power battery；It is controlled according to the permission discharge power
The operation of the electric vehicle.
Optionally, described that the power electric is determined according to the state-of-charge of the power battery, temperature and health status
The step of permission discharge power in pond includes：Basic discharge power is determined according to the state-of-charge of the power battery and temperature；
Correction factor is determined according to the health status of the power battery；Determine that the power battery allows to discharge by following formula
Power：
P=KP0
Wherein, P is the permission discharge power of the power battery, P0For the basic discharge power, K is amendment system
Number.
Optionally, described the step of controlling the operation of the electric vehicle according to the permission discharge power, includes：When sentencing
When the fixed power battery breaks down, the speed of the electric vehicle is obtained；Institute is determined according to the speed of the electric vehicle
State the rate for allowing discharge power to reduce；The permission discharge power is updated according to the rate that the permission discharge power reduces；
The operation of the electric vehicle is controlled according to updated permission discharge power.
Optionally, the speed according to the electric vehicle determines the step of rate that the permission discharge power reduces
Including：When the speed of the electric vehicle is in the first vehicle speed intervals, the rate for determining that the permission discharge power reduces is
First rate；When the speed of the electric vehicle is in the second vehicle speed intervals, the speed that the permission discharge power reduces is determined
Rate is the second rate, wherein the speed of first vehicle speed intervals is less than the speed of second vehicle speed intervals, first speed
Rate is greater than second rate.
Optionally, described the step of controlling the operation of the electric vehicle according to the permission discharge power, includes：When sentencing
When the fixed power battery breaks down, the grade of failure is judged；The rate reduced according to the permission discharge power is more
Newly the step of permission discharge power includes：When determining the grade of failure for catastrophe failure, allow the function that discharges according to described
The rate that rate reduces updates the permission discharge power, until the permission discharge power is zero；When the grade for determining failure is
When minor failure, the permission discharge power is updated according to the rate that the permission discharge power reduces, allows to put until described
Electrical power is scheduled performance number.
The disclosure also provides a kind of control device of electric vehicle.Described device includes：Module is obtained, for working as the electricity
Motor-car when driving, obtains state-of-charge, temperature and the health status of power battery；Determining module, with the acquisition module
Connection, for determining that the power battery allows to put according to the state-of-charge of the power battery, temperature and health status
Electrical power；Control module is connect with the determining module, for controlling the electric vehicle according to the permission discharge power
Operation.
The disclosure also provides a kind of computer readable storage medium, is stored thereon with computer program.The program is processed
The step of above method that the disclosure provides is realized when device executes.
The disclosure also provides a kind of electric vehicle, including power battery and controller, and the controller is configured as executing
The step of above method that the disclosure provides.
Through the above technical solutions, allowing to discharge using what the health status of power battery was determined as a reference factor
Power, so that the result determined is more in line with the actual conditions of power battery.Therefore, electric vehicle is according to the permission discharge power
When operation, the cycle life of power battery is higher, and the safety of electric vehicle traveling is higher.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings：
Fig. 1 is the flow chart of the control method for the electric vehicle that an exemplary embodiment provides；
Fig. 2 is the flow chart of the control method for the electric vehicle that another exemplary embodiment provides；
Fig. 3 is the flow chart for determining the rate for allowing discharge power to reduce that an exemplary embodiment provides；
Fig. 4 is the flow chart of the control method for the electric vehicle that another exemplary embodiment provides；
Fig. 5 is the flow chart that the update that an exemplary embodiment provides allows discharge power；
Fig. 6 is the block diagram of the control device for the electric vehicle that an exemplary embodiment provides.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
Fig. 1 is the flow chart of the control method for the electric vehicle that an exemplary embodiment provides.As shown in Figure 1, the side
Method may comprise steps of.
In step s 11, when electric vehicle when driving, obtain SOC, temperature and the health status (State of power battery
Of Health, SOH).
Wherein, the SOC of power battery, temperature and SOH can be detected by common detection method, from dedicated inspection
It surveys device to obtain, or is obtained from the ECU of vehicle.
In step s 12, the permission discharge power of power battery is determined according to the SOC of power battery, temperature and SOH.
As described above, the permission discharge power of usually power battery is determined by the SOC and temperature of power battery.In vehicle
It can store the corresponding relationship for allowing discharge power, the SOC and temperature of power battery this three, it can be according to power battery
SOC and temperature find out corresponding permission discharge power in real time.Table 1 shows the correspondence of the above-mentioned three of embodiment offer
Relationship.
Table 1
In the disclosure, this reference factor of the SOH of power battery joined on this basis, allow the function that discharges to determine
Rate.It is, determining the permission discharge power of power battery according to this three of the SOC of power battery, temperature and SOH.
Specifically, the permission discharge power of power battery can be determined by a variety of methods.It, can be with for example, simply
Producing previously according to experience or test allows discharge power, SOC, SOH of power battery and temperature this corresponding relationship
Database, storage in the car, get SOC, SOH and temperature of power battery in real time, determined by way of tabling look-up
Corresponding permission discharge power.
In step s 13, according to the operation for allowing discharge power to control electric vehicle.
It determines after allowing discharge power, such as can be according to the operation of conventional control strategy control electric vehicle.
Through the above technical solutions, allowing to discharge using what the health status of power battery was determined as a reference factor
Power, so that the result determined is more in line with the actual conditions of power battery.Therefore, electric vehicle is according to the permission discharge power
When operation, the cycle life of power battery is higher, and the safety of electric vehicle traveling is higher.
In one embodiment, the basis for allowing discharge power as basic discharge power can be being determined by common method
On, it is modified by the correction factor that SOH is determined, the permission discharge power finally determined.In this embodiment, in Fig. 1
On the basis of, the step of permission discharge power of power battery is determined according to the SOC of power battery, temperature and SOH (step
S12) include the following steps.
Basic discharge power is determined according to the SOC of power battery and temperature；
Correction factor is determined according to the SOH of power battery；
The permission discharge power of power battery is determined by following formula：
P=KP0
Wherein, P is the permission discharge power of power battery, P0For basic discharge power, K is correction factor.Basis electric discharge
Power P0It can be obtained by way of tabling look-up in the SOC and temperature for getting power battery.The value range of adjusted coefficient K
It can be 0≤K≤1.The SOH of power battery reflects the current capacities of power battery and the percentage of factory capacity.SOH is got over
Greatly, for the current capacities of power battery closer to factory capacity, health status is better.It therefore, can be previously according to test or warp
The corresponding relationship for determining different SOH and adjusted coefficient K is tested, and is stored.Usual SOH is bigger, and adjusted coefficient K is bigger.When
When the SOH of known power battery, can by directly by tabling look-up in a manner of determine adjusted coefficient K.
In the embodiment, correction factor is determined by SOH, the permission discharge power obtained to conventional method is modified,
Final permission discharge power is obtained, operation is simple, and accuracy is good.
When power battery breaks down, discharge power can will be allowed to reduce according to certain rate, with support vehicles
The safety of traveling.Fig. 2 is the flow chart of the control method for the electric vehicle that another exemplary embodiment provides.As shown in Fig. 2,
It may include following step according to the step of allowing discharge power to control the operation of electric vehicle (step S13) on the basis of Fig. 1
Suddenly.
In step S131, when determining that power battery breaks down, the speed of electric vehicle is obtained.
Wherein, judging whether power battery breaks down can be by a variety of method.For example, the temperature when power battery is big
When scheduled temperature threshold (for example, 50 DEG C), it is possible to determine that break down, alternatively, the insulating resistance value when power battery is small
When scheduled resistance value (for example, 10k Ω), it also can be determined that and break down.Speed can be directly acquired from the ECU of vehicle
It arrives.
In step S132, the rate for allowing discharge power to reduce is determined according to the speed of electric vehicle.
It is, the rate for allowing discharge power to reduce is related with speed.For example, experience or test can be first passed through in advance really
The corresponding relationship determined speed and allow the rate of discharge power reduction between the two, and stored.When known speed, so that it may
By directly by tabling look-up in a manner of determine allow discharge power reduce rate.Specifically, speed and permission discharge power reduce
Rate corresponding relationship between the two can be set to when speed is bigger, the corresponding rate for allowing discharge power to reduce is got over
It is small, that is, speed is faster, allows discharge power to change slower, to ensure the safety of driving.
In step S133, being updated according to the rate for allowing discharge power to reduce allows discharge power.
In step S134, the operation of electric vehicle is controlled according to updated permission discharge power.
In this way, determining the rate for allowing discharge power to reduce referring to current vehicle speed when power battery breaks down, making
The rate for allowing discharge power to reduce is more reasonable, to ensure the safety of vehicle driving.
Speed and the corresponding relationship for allowing the rate of discharge power reduction between the two can be drawn according to the section of speed
Point.In another embodiment, the step of rate for allowing discharge power to reduce being determined according to the speed of electric vehicle (step
S132) may include：
When the speed of electric vehicle is in the first vehicle speed intervals, determine that the rate for allowing discharge power to reduce is the first speed
Rate；When the speed of electric vehicle is in the second vehicle speed intervals, determine that the rate for allowing discharge power to reduce is the second rate.Its
In, the speed of the first vehicle speed intervals is less than the speed of the second vehicle speed intervals, and first rate is greater than second rate.
It is, when speed is in the bigger vehicle speed intervals of speed, the corresponding rate for allowing discharge power to reduce
It is smaller, that is, speed is faster, allows discharge power to change slower, to ensure the safety of driving.Speed can be divided into multiple areas
Between.Fig. 3 is the flow chart for determining the rate for allowing discharge power to reduce that an exemplary embodiment provides.Wherein, V0< V1, vehicle
Fast V is divided into three sections：V≤V0、V0< V < V1、V1≤ V, the corresponding rate for allowing discharge power to reduce are Δ A1、Δ
A2、ΔA3, and Δ A1> Δ A2> Δ A3。
In the embodiment, by speed demarcation interval, to determine the rate of corresponding permission discharge power reduction, operation letter
Single, accuracy is good.
In addition, the end value after allowing discharge power to reduce can be set for the different degrees of failure of power battery,
It is, just no longer reducing when allowing discharge power to be reduced to the end value.Fig. 4 is that another exemplary embodiment provides
The flow chart of the control method of electric vehicle.As shown in figure 4, on the basis of Fig. 2, electronic according to allowing discharge power to control
The step of operation of vehicle (step S13) can also include step S135.In step S135, when event occurs for judgement power battery
When barrier, the grade of failure is judged.
Wherein, the grade of failure can be judged by a variety of methods.For example, when the temperature of power battery is greater than 70 DEG C,
Can be determined that generation catastrophe failure, when the temperature of power battery is greater than 50 DEG C and when less than 70 DEG C, it is possible to determine that occur it is slight therefore
Barrier.Alternatively, when the insulating resistance value of power battery is less than 5k Ω, it is possible to determine that catastrophe failure occurs, it is exhausted when power battery
When edge resistance value is greater than 5k Ω and is less than 10k Ω, it is possible to determine that minor failure occurs.
In the embodiment, the step of allowing discharge power (step S133), is updated according to the rate for allowing discharge power to reduce
Include the following steps.
In step S1331, when determining the grade of failure for catastrophe failure, according to the rate for allowing discharge power to reduce
Updating allows discharge power, until discharge power is allowed to be zero.
In step S1332, when determining the grade of failure for minor failure, according to the rate for allowing discharge power to reduce
Updating allows discharge power, until discharge power is allowed to be scheduled performance number.
It is, until discharge power will be allowed to drop to zero always, working as power electric when catastrophe failure occurs for power battery
When minor failure occurs for pond, discharge power will be allowed to drop to scheduled performance number, vehicle is run in which still can continue low speed.This
Sample determines the final operating status of vehicle according to the fault severity level of power battery, to ensure the safety of vehicle driving.
Fig. 5 is the flow chart that the update that an exemplary embodiment provides allows discharge power.Wherein, PAFor scheduled power
Value.
The disclosure also provides a kind of control device of electric vehicle.Fig. 6 is the electric vehicle that an exemplary embodiment provides
Control device block diagram.As shown in fig. 6, the control device 10 of the electric vehicle may include obtaining module 11, determining mould
Block 12 and control module 13.
It obtains module 11 to be used to work as electric vehicle when driving, obtains state-of-charge, temperature and the healthy shape of power battery
State.
Determining module 12 is connect with module 11 is obtained, for according to the state-of-charge of power battery, temperature and healthy shape
State determines the permission discharge power of power battery.
Control module 13 is connect with determining module 12, for according to the operation for allowing discharge power to control electric vehicle.
Optionally, the determining module 12 may include that the first determining submodule, the second determining submodule and third determine
Submodule.
First determines that submodule is used to determine basic discharge power according to the state-of-charge and temperature of power battery.
Second determines that submodule is used to determine correction factor according to the health status of power battery.
Third determines submodule for determining the permission discharge power of power battery by following formula：
P=KP0
Wherein, P is the permission discharge power of power battery, P0For basic discharge power, K is correction factor.
Optionally, the control module 13 may include acquisition submodule, the 4th determining submodule, update submodule and control
System module.
Acquisition submodule is used to obtain the speed of electric vehicle when determining that power battery breaks down.
4th determines that submodule is used to determine the rate for allowing discharge power to reduce according to the speed of electric vehicle.
Updating submodule and being used to be updated according to the rate for allowing discharge power to reduce allows discharge power.
Control submodule is used to control the operation of electric vehicle according to updated permission discharge power.
Optionally, the described 4th determine that submodule may include that the 5th determining submodule and the 6th determine submodule.
5th determines that submodule is used for when the speed of electric vehicle is in the first vehicle speed intervals, and determining allows discharge power
Reduced rate is first rate.
6th determines that submodule is used for when the speed of electric vehicle is in the second vehicle speed intervals, and determining allows discharge power
Reduced rate is the second rate.Wherein, for the speed of the first vehicle speed intervals less than the speed of the second vehicle speed intervals, first rate is big
In the second rate.
Optionally, the control module 13 may include judging submodule.
Judging submodule is used to judge the grade of failure when determining that power battery breaks down.
In the embodiment, updating submodule may include that the first update submodule and second update submodule.
First, which updates submodule, is used for when determining the grade of failure for catastrophe failure, according to allowing discharge power to reduce
Rate, which updates, allows discharge power, until discharge power is allowed to be zero.
Second, which updates submodule, is used for when determining the grade of failure for minor failure, according to allowing discharge power to reduce
Rate, which updates, allows discharge power, until discharge power is allowed to be scheduled performance number.
About the device in above-described embodiment, wherein modules execute the concrete mode of operation in related this method
Embodiment in be described in detail, no detailed explanation will be given here.
The disclosure also provides a kind of computer readable storage medium, is stored thereon with computer program.The program is processed
The step of above method is realized when device executes.
The disclosure also provides a kind of electric vehicle, including power battery and controller.The controller is configured as executing
The step of above method.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (10)
1. a kind of control method of electric vehicle, which is characterized in that the method includes：
When the electric vehicle when driving, obtain state-of-charge, temperature and the health status of power battery；
According to the state-of-charge of the power battery, temperature and health status determine the power battery allow discharge function
Rate；
The operation of the electric vehicle is controlled according to the permission discharge power.
2. the method according to claim 1, wherein the state-of-charge according to the power battery, temperature
And health status determines that the step of permission discharge power of the power battery includes：
Basic discharge power is determined according to the state-of-charge of the power battery and temperature；
Correction factor is determined according to the health status of the power battery；
The permission discharge power of the power battery is determined by following formula：
P=KP0
Wherein, P is the permission discharge power of the power battery, P0For the basic discharge power, K is the correction factor.
3. the method according to claim 1, wherein described described electronic according to permission discharge power control
The step of operation of vehicle includes：
When determining that the power battery breaks down, the speed of the electric vehicle is obtained；
The rate that the permission discharge power reduces is determined according to the speed of the electric vehicle；
The permission discharge power is updated according to the rate that the permission discharge power reduces；
The operation of the electric vehicle is controlled according to updated permission discharge power.
4. according to the method described in claim 3, it is characterized in that, the speed according to the electric vehicle determine it is described permit
Perhaps the step of rate of discharge power reduction includes：
When the speed of the electric vehicle is in the first vehicle speed intervals, the rate for determining that the permission discharge power reduces is the
One rate；
When the speed of the electric vehicle is in the second vehicle speed intervals, the rate for determining that the permission discharge power reduces is the
Two rates, wherein the speed of first vehicle speed intervals is less than the speed of second vehicle speed intervals, and the first rate is greater than
Second rate.
5. according to the method described in claim 3, it is characterized in that, described described electronic according to permission discharge power control
The step of operation of vehicle includes：When determining that the power battery breaks down, the grade of failure is judged；
It is described to include according to the step of rate update permission discharge power for allowing discharge power to reduce：
When determining the grade of failure for catastrophe failure, being updated according to the rate that the permission discharge power reduces described allows to put
Electrical power, until the permission discharge power is zero；
When determining the grade of failure for minor failure, being updated according to the rate that the permission discharge power reduces described allows to put
Electrical power, until the permission discharge power is scheduled performance number.
6. a kind of control device of electric vehicle, which is characterized in that described device includes：
Module is obtained, for working as the electric vehicle when driving, obtains state-of-charge, temperature and the healthy shape of power battery
State；
Determining module is connect with the acquisition module, for according to the state-of-charge of the power battery, temperature and healthy shape
State determines the permission discharge power of the power battery；
Control module is connect with the determining module, for controlling the fortune of the electric vehicle according to the permission discharge power
Row.
7. device according to claim 6, which is characterized in that the determining module includes：
First determines submodule, for determining basic discharge power according to the state-of-charge and temperature of the power battery；
Second determines submodule, for determining correction factor according to the health status of the power battery；
Third determines submodule, for determining the permission discharge power of the power battery by following formula：
P=KP0
Wherein, P is the permission discharge power of the power battery, P0For the basic discharge power, K is the correction factor.
8. device according to claim 6, which is characterized in that the control module includes：
Acquisition submodule, for obtaining the speed of the electric vehicle when determining that the power battery breaks down；
4th determines submodule, for determining the rate of the permission discharge power reduction according to the speed of the electric vehicle；
Submodule is updated, the rate for reducing according to the permission discharge power updates the permission discharge power；
Control submodule, for controlling the operation of the electric vehicle according to updated permission discharge power.
9. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
The step of any one of claim 1-5 the method is realized when row.
10. a kind of electric vehicle, including power battery and controller, the controller is configured as perform claim and requires in 1-5
The step of any one claim the method.
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| CN201810708868.5A CN108909456B (en) | 2018-07-02 | 2018-07-02 | Control method and device for electric vehicle, storage medium and electric vehicle |
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| CN109709490A (en) * | 2018-12-29 | 2019-05-03 | 重庆小康工业集团股份有限公司 | The modification method of lithium battery system Life cycle SOC |
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| CN112098853A (en) * | 2020-08-21 | 2020-12-18 | 北京车和家信息技术有限公司 | Capacity attenuation battery discharge power determination method and device |
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