CN117341533A - Control method and device of power system, power system and vehicle - Google Patents
Control method and device of power system, power system and vehicle Download PDFInfo
- Publication number
- CN117341533A CN117341533A CN202210784891.9A CN202210784891A CN117341533A CN 117341533 A CN117341533 A CN 117341533A CN 202210784891 A CN202210784891 A CN 202210784891A CN 117341533 A CN117341533 A CN 117341533A
- Authority
- CN
- China
- Prior art keywords
- battery module
- power
- battery
- feedback
- soc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000007599 discharging Methods 0.000 claims abstract description 58
- 238000007600 charging Methods 0.000 claims description 93
- 238000010277 constant-current charging Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 6
- 238000011217 control strategy Methods 0.000 description 4
- 230000009194 climbing Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- 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
- B60L15/32—Control or regulation of multiple-unit electrically-propelled vehicles
-
- 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
-
- 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
- B60L2240/54—Drive Train control parameters related to batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The disclosure relates to a control method and device of a power system, the power system and a vehicle. The control method of the power system is applied to the power system comprising a plurality of battery modules, and comprises the following steps: periodically acquiring the SOCs of the plurality of battery modules when the power system is in a battery discharging state; updating a discharge mode of each battery module according to the SOCs of the plurality of battery modules, wherein the discharge mode comprises a main discharge mode and an auxiliary discharge mode, and the battery module in the main discharge mode discharges preferentially than the battery module in the auxiliary discharge mode; and controlling the plurality of battery modules to discharge according to the respective updated discharge modes. Through the technical scheme, each battery module can be controlled to discharge in a main discharging mode or an auxiliary discharging mode according to the SOC of the plurality of battery modules, so that the plurality of battery modules can be orderly discharged according to the electricity consumption requirement of the whole vehicle.
Description
Technical Field
The disclosure relates to the field of new energy vehicles, and in particular relates to a control method and device of a power system, the power system and a vehicle.
Background
With the rapid development of electric vehicle technology, electric vehicles are increasingly accepted by consumers, and the application scenes of the electric vehicles are also becoming more and more abundant. The electric power system is also gradually applied to large SUVs, off-road vehicles, pick-up trucks and other vehicle types. The whole vehicle torque requirement and the whole vehicle power requirement of large SUVs, off-road vehicles, pick-up trucks and other vehicle types under some special working conditions (such as climbing, obstacle surmounting, desert off-road and the like) are very high, and the power battery is required to be capable of outputting enough power to meet the requirement of a power system. Meanwhile, in order to meet the endurance requirement of the vehicle under a specific working condition, the capacity of the power battery is required to be large enough. In order to meet the use requirement of the vehicle under the special working condition, compared with the technical scheme that the single battery module is used for supplying power to the vehicle power system, the power supply of the plurality of battery modules to the vehicle power system has the advantage of being larger.
However, when the plurality of battery modules are used to power the vehicle power system, the performance of the plurality of battery modules may be unbalanced, which is inconvenient for maintenance and affects the user experience.
Disclosure of Invention
The invention aims to provide a control method and device of a power system, the power system and a vehicle, so that the performances of a plurality of battery modules in the vehicle are more balanced.
In order to achieve the above object, the present disclosure provides a control method of a power system including a plurality of battery modules, the method including:
periodically acquiring the SOCs of the plurality of battery modules when the power system is in a battery discharging state;
updating a discharge mode of each battery module according to the SOCs of the plurality of battery modules, wherein the discharge mode comprises a main discharge mode and an auxiliary discharge mode, and the battery module in the main discharge mode discharges preferentially than the battery module in the auxiliary discharge mode;
and controlling the plurality of battery modules to discharge according to the respective updated discharge modes.
Optionally, the power system includes a first battery module and a second battery module with the same specification, the current discharge mode of the first battery module is the main discharge mode, the current discharge mode of the second battery module is the auxiliary discharge mode, and updating the discharge mode of each battery module according to the SOC of the plurality of battery modules includes:
updating the discharge mode of the first battery module to the main discharge mode and updating the discharge mode of the second battery module to the auxiliary discharge mode in any of the following cases:
The SOC of the first battery module is larger than a preset main discharge cut-off threshold value;
the SOCs of the first battery module and the second battery module are both larger than a preset discharge cut-off threshold value and are both smaller than the main discharge cut-off threshold value;
the discharge mode of the first battery module is updated to the auxiliary discharge mode, and the discharge mode of the second battery module is updated to the main discharge mode in the following cases:
the SOC of the first battery module is larger than the discharge cut-off threshold and smaller than the main discharge cut-off threshold, and the SOC of the second battery module is larger than the main discharge cut-off threshold.
Optionally, the discharging mode further includes a discharging disabling mode, and the updating the discharging mode of each battery module according to the SOC of the plurality of battery modules further includes:
if the first battery module fails or the SOC of the first battery module is less than the discharge cutoff threshold, the discharge mode of the first battery module is updated to the discharge forbidden mode, the discharge mode of the second battery module is updated to the main discharge mode, and the discharge mode of the second battery module is updated to the discharge forbidden mode until the SOC of the second battery module is less than the discharge cutoff threshold.
Optionally, the controlling the plurality of battery modules to discharge according to the respective updated discharge modes includes:
if the required power of the power system is smaller than the maximum output power of the first battery module, controlling the first battery module to output the required power;
if the required power of the power system is larger than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module and the second battery module to output respective maximum output power;
and if the required power of the power system is larger than the maximum output power of the first battery module and smaller than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module to output the maximum output power and controlling the second battery module to output the difference between the required power and the output power of the first battery module.
Optionally, the power system includes a first battery module and a second battery module with the same specification, the current discharge mode of the first battery module is the main discharge mode, and the current discharge mode of the second battery module is the auxiliary discharge mode, and the method further includes:
And when the power system is in a battery feedback state, controlling the first battery module and the second battery module to receive electric feedback according to the current SOC and the maximum feedback power of the first battery module and the second battery module.
Optionally, the controlling the first battery module and the second battery module to receive the electrical feedback according to the current SOC and the maximum feedback power of the first battery module and the second battery module includes:
if the SOC of the first battery module is smaller than a preset charge permission threshold value and the feedback electric power generated by vehicle electric braking is smaller than the current maximum feedback power of the first battery module, the first battery module is controlled to absorb the feedback electric energy;
if the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the current maximum feedback power of the first battery module and smaller than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, the first battery module is controlled to absorb feedback electric energy with the maximum feedback power, and the second battery module is controlled to absorb feedback electric energy with the difference between the feedback electric power and the maximum feedback power;
If the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, and both the first battery module and the second battery module are controlled to absorb feedback electric energy with the maximum feedback power;
if the SOC of the first battery module is larger than the charge permission threshold, the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is smaller than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy;
if the SOC of the first battery module is larger than the charge permission threshold, the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is larger than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy with the maximum feedback power;
and if the SOC of the first battery module and the SOC of the second battery module are both larger than the charge permission threshold, controlling the first battery module and the second battery module not to absorb feedback electric energy.
Optionally, the power system includes a first battery module and a second battery module having the same specification, and the method further includes:
when the power system is in a battery charging state, if electric energy from two charging guns is received and the SOC of the first battery module is smaller than that of the second battery module, the two charging guns are controlled to charge the first battery module at the same time until the SOC of the first battery module is equal to that of the second battery module, and the two charging guns are controlled to charge the first battery module and the second battery module respectively;
when the power system is in a battery charging state, if electric energy from one charging gun is received and the SOC of the first battery module is smaller than that of the second battery module, the one charging gun is controlled to charge the first battery module until the first battery module jumps from constant power charging to constant current charging, and the one charging gun is controlled to charge the second battery module; and if the second battery module is fully charged, controlling the charging gun to charge the first battery module.
Optionally, the power system includes a front motor for driving the front wheels and a rear motor for driving the rear wheels, and the controlling the plurality of battery modules to discharge according to the respective updated discharge modes includes:
Controlling the plurality of battery modules to supply power to the front motor when the current required torque of the vehicle is less than the maximum output torque of the front motor and the current traction required power of the vehicle is less than the maximum traction power of the front motor;
controlling the plurality of battery modules to supply power to the front motor and the rear motor under the condition that the vehicle starts;
the plurality of battery modules is controlled to supply power to the rear motor in the event of a front wheel slip of the vehicle.
Optionally, the method further comprises:
controlling the front motor to perform electric braking feedback under the condition that the maximum electric braking force of the front motor is larger than the braking force required by the whole vehicle;
and under the condition that the maximum electric braking force of the front motor is smaller than the required braking force of the whole vehicle, controlling the front motor and the rear motor to carry out electric braking feedback.
The present disclosure also provides a control device of a power system, for executing the steps of the control method of the power system described above.
The disclosure also provides a power system, including the control device of the power system, a first battery module, a second battery module, a first charging port, a second charging port, a first OBC, a second OBC, a first front motor, a second front motor, a first rear motor and a second rear motor;
The control device comprises a whole vehicle controller, a first BMS, a second BMS, a first front motor controller, a second front motor controller, a first rear motor controller and a second rear motor controller which are respectively connected with the whole vehicle controller;
the first front motor and the second front motor are respectively used for driving two front wheels of a vehicle, and the first rear motor and the second rear motor are respectively used for driving two rear wheels of the vehicle;
the first charging port is connected with the first OBC and used for being inserted into a charging gun, and the second charging port is connected with the second OBC and used for being inserted into the charging gun;
the first BMS is respectively connected with the first OBC and the first battery module, is connected with the first front motor through the first front motor controller, is connected with the second front motor through the second front motor controller, is connected with the first rear motor through the first rear motor controller, and is connected with the second rear motor through the second rear motor controller;
the second BMS is respectively connected with the second OBC and the second battery module, and is connected with the first front motor through the first front motor controller, is connected with the second front motor through the second front motor controller, is connected with the first rear motor through the first rear motor controller, and is connected with the second rear motor through the second rear motor controller.
The disclosure also provides a vehicle equipped with the power system.
In the above technical solution, the power system includes a plurality of battery modules. When the power system is in a battery discharge state, each battery module can be controlled to discharge in a main discharge mode or in an auxiliary discharge mode according to the SOCs of a plurality of battery modules, namely, the battery module more suitable for discharging is controlled to discharge preferentially than other battery modules according to the SOCs of the battery modules. In this way, in the use process of the vehicle, the SOCs of the battery modules tend to be the same, the discharge times tend to be equal, and the aging degree is equal, so that the performance of the battery modules is more balanced, the service life of the battery is prolonged, and the maintenance and the service of the vehicle are facilitated.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart of a control method of a powertrain provided in an exemplary embodiment in accordance with the present disclosure.
Fig. 2 is a flowchart of a battery module discharge mode transition provided in an exemplary embodiment according to the present disclosure.
Fig. 3 is a flowchart of a battery module discharge mode transition provided in an exemplary embodiment according to the present disclosure.
Fig. 4 is a schematic structural view of a power system according to an exemplary embodiment of the present disclosure.
Description of the reference numerals
A first battery module-1, a second battery module-2, a first charging port-3, a second charging port-4, a first OBC-5, a second OBC-6, a first front motor-7, a second front motor-8, a first rear motor-9, a second rear motor-10, an overall vehicle controller-11, a first BMS-12, a second BMS-13, a first front motor controller-14, a second front motor controller-15, a first rear motor controller-16, a second rear motor controller-17, a first boosting device-18, a second boosting device-19, a high voltage electric appliance-20, a voltage reducing device-21, a low voltage electric appliance-22
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
FIG. 1 is a flow chart of a method of controlling a powertrain provided in an exemplary embodiment of the present disclosure. The control method of the power system is applied to the power system including a plurality of battery modules. As shown in fig. 1, the control method of the power system includes steps S101 to S103.
In step S101, the SOCs of the plurality of battery modules are periodically acquired while the power system is in the battery discharge state.
The plurality of battery modules refers to at least two battery modules provided in the power system. A battery module disposed in the power system is configured to provide electrical power to the power system, e.g., the battery module may provide electrical power to the electric machine. Periodically acquiring the SOC (State of charge) of the plurality of battery modules refers to periodically acquiring the SOC of each of the plurality of battery modules. The periodically acquiring the SOCs of the plurality of battery modules may be acquiring the SOCs of the plurality of battery modules with a preset duration as a period. For example, the SOC of the plurality of battery modules may be periodically acquired with a period of 1 second.
In step S102, the discharge pattern of each battery module is updated according to the SOCs of the plurality of battery modules. The discharge modes include a main discharge mode and an auxiliary discharge mode, and the battery module in the main discharge mode is preferentially discharged over the battery module in the auxiliary discharge mode.
The main discharge mode and the auxiliary discharge mode are operation modes of the battery module preset by a developer. The battery module in the main discharging mode is preferably discharged than the battery module in the auxiliary discharging mode, namely, the battery module in the main discharging mode is preferably used for discharging in the discharging process of the battery modules so as to meet the power consumption requirement of the whole vehicle. For example, in the running process of the vehicle, when the maximum output power output by the battery module in the main discharging mode is greater than or equal to the power consumption requirement of the whole vehicle, the battery module in the main discharging mode is used independently to supply power to the whole vehicle; when the maximum output power which can be output by the battery module in the main discharging mode is smaller than the power consumption requirement of the whole vehicle, the batteries in the main discharging mode and the auxiliary discharging mode are controlled to discharge simultaneously so as to meet the power consumption requirement of the whole vehicle. The maximum output power is the maximum value of electric power that the battery module can output in the current SOC and the current temperature state. The maximum output power is preset by a designer in consideration of battery characteristics. Updating the discharge pattern of each battery module according to the SOC of the plurality of battery modules may be to periodically update the discharge pattern of each battery module according to the magnitude of the SOC of the plurality of battery modules. For example, the magnitude of the SOC of each battery module may be compared every 10 minutes during the running of the vehicle, the discharge mode of the battery module having the largest SOC among the battery modules may be updated to the main discharge mode, and the discharge mode of the battery module having the different SOC among the battery modules may be updated to the auxiliary discharge mode.
In step S103, the plurality of battery modules are controlled to discharge in accordance with the updated discharge patterns.
In this scheme, the driving system includes a plurality of battery modules. When the power system is in a battery discharging state, each battery module can be controlled to discharge in a main discharging mode or an auxiliary discharging mode according to the SOC of the plurality of battery modules, so that the plurality of battery modules can be discharged orderly according to the electricity consumption requirement of the whole vehicle. The discharging mode of each battery module is updated according to the SOCs of the plurality of battery modules, so that the SOCs of the plurality of battery modules tend to be the same, the discharging times tend to be equal and the aging degrees are equivalent in the using process of the vehicle, therefore, the performance of the plurality of battery modules is more balanced, the service life of the battery is prolonged, and the maintenance and the service of the vehicle are facilitated.
In yet another embodiment, a power system includes a first battery module and a second battery module of the same gauge. Fig. 2 is a flowchart of a battery module discharging mode conversion provided in an exemplary embodiment according to the present disclosure, and as shown in fig. 2, a first battery module current discharging mode is a main discharging mode, a second battery module current discharging mode is an auxiliary discharging mode, and updating the discharging mode of each battery module according to the SOC of a plurality of battery modules includes:
In any of the following cases, the discharge mode of the first battery module is updated to the main discharge mode, and the discharge mode of the second battery module is updated to the auxiliary discharge mode:
the SOC of the first battery module is larger than a preset main discharge cut-off threshold value;
the SOCs of the first battery module and the second battery module are both larger than a preset discharge cutoff threshold value and are both smaller than a main discharge cutoff threshold value.
In the following case, the discharge mode of the first battery module is updated to the auxiliary discharge mode, and the discharge mode of the second battery module is updated to the main discharge mode:
the SOC of the first battery module is greater than the discharge cutoff threshold and less than the main discharge cutoff threshold, and the SOC of the second battery module is greater than the main discharge cutoff threshold.
For example, the first battery module and the second battery module may be the same model battery modules manufactured by the same manufacturer. The discharge cutoff threshold is less than the main discharge cutoff threshold. The designer may preset the main discharge cutoff threshold and the discharge cutoff threshold according to the characteristics of the battery. According to the characteristics of the battery module, when the SOC of the battery module is larger than the main discharge cut-off threshold, the discharge power of the battery module is not changed greatly, and the battery module has good discharge characteristics; in the process that the SOC is reduced from the main discharge cut-off threshold value to the discharge cut-off threshold value, the discharge power of the battery module is gradually reduced; if the SOC decreases to the discharge cutoff threshold, the battery module stops discharging. For example, if the first battery module and the second battery module are ternary lithium batteries, the main discharge cutoff threshold of the first battery module and the second battery module may be set to 30% and the discharge cutoff threshold may be set to 8%; if the first battery module and the second battery module are lithium iron phosphate batteries, the main discharge cut-off threshold of the first battery module and the second battery module can be set to 40%, and the discharge cut-off threshold can be set to 8%.
In this embodiment, the discharge modes of the first battery module and the second battery module can be updated according to the magnitude relation between the SOC of the first battery module and the main discharge cutoff threshold and the magnitude relation between the SOC of the second battery module and the main discharge cutoff threshold and the discharge cutoff threshold. For example, in the case where the maximum discharge power of the first battery module has been significantly reduced but still can be discharged (i.e., the SOC of the first battery module is consumed below the main discharge cutoff threshold and above the discharge cutoff threshold), and the maximum discharge power of the second battery module is relatively stable (i.e., the SOC of the second battery module is greater than the main discharge cutoff threshold), the discharge mode of the first battery module is updated to the auxiliary discharge mode and the discharge mode of the second battery module is updated to the main discharge mode, so that the maximum discharge power of the battery in the main discharge mode in the power system is relatively stable. Therefore, the battery module in the main discharging mode can be singly discharged to meet the electric power requirement of the whole vehicle, and the control logic of the whole vehicle power supply is simplified.
In yet another embodiment, the discharge mode further includes a discharge disabled mode. Fig. 3 is a flowchart of a battery module discharge mode conversion provided in an exemplary embodiment according to the present disclosure, and as shown in fig. 3, updates a discharge mode of each battery module according to SOCs of a plurality of battery modules, further including:
If the first battery module fails or the SOC of the first battery module is smaller than the discharge cutoff threshold, the discharge mode of the first battery module is updated to be the discharge forbidden mode, the discharge mode of the second battery module is updated to be the main discharge mode, and the discharge mode of the second battery module is updated to be the discharge forbidden mode until the SOC of the second battery module is smaller than the discharge cutoff threshold.
The discharging forbidden mode is a discharging mode of the battery module preset by a designer, and the battery module in the discharging forbidden mode can be set to be not allowed to discharge.
In this embodiment, the battery module can be inhibited from discharging under the condition that a small amount of electric quantity (SOC is smaller than the discharge cutoff threshold) remains in the battery module, the battery module is prevented from being excessively discharged, and the service life of the battery is prolonged. In addition, when the battery module in the main discharging mode fails, the discharging mode is updated to the forbidden discharging mode, and the discharging mode of the battery in the auxiliary discharging mode is updated to the main discharging mode, so that the situation that the vehicle loses power and the driving safety is influenced and the service life of the battery module is prevented from being influenced by the discharging of the failed battery module under the condition that the failed battery module cannot be discharged can be avoided.
In yet another embodiment, controlling the plurality of battery modules to discharge according to respective updated discharge patterns includes:
1) If the required power of the power system is smaller than the maximum output power of the first battery module, controlling the first battery module to output the required power;
2) If the required power of the power system is larger than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module and the second battery module to output the respective maximum output power;
3) And if the required power of the power system is larger than the maximum output power of the first battery module and smaller than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module to output the maximum output power, and controlling the difference between the required power output by the second battery module and the output power of the first battery module.
The power demand of the power system refers to the electric power that the power system of the vehicle needs to output from the battery module in order to meet the driving demand of the user.
In this embodiment, specifically, a method of controlling the discharge of the battery modules in the main discharge mode and the auxiliary discharge mode according to the magnitude relation between the required power of the power system and the maximum output power of each battery module is proposed. In this embodiment, the battery module (first battery module) in the main discharging mode is preferentially used for discharging so as to meet the electric power demand of the power system; under the condition that the electric energy output by the battery in the main discharging mode at the maximum output power still cannot meet the electric power requirement of the power system, the battery module in the main discharging mode outputs the electric energy at the maximum output power, the battery module in the auxiliary discharging mode takes the own maximum output power as the upper limit value of the output power to complement the residual required power of the power system (the required power of the power system is larger than the maximum output power of the battery module in the main discharging mode), so that the battery module in the main discharging mode and the battery module in the auxiliary discharging mode are orderly discharged under the condition of meeting the power requirement of the power system, and the control method of the battery module is simplified while the use requirement of a user is met.
For example, under the normal working condition that a single battery module can meet the electric power requirement of the vehicle, such as the vehicle running on an urban road, the battery module in the main discharging mode discharges; under the special working conditions that the power requirement of the whole vehicle is large, such as climbing, obstacle crossing, desert cross-country and the like, and the electric power requirement of the vehicle cannot be met by a single battery module, the battery module in the main discharging mode and the battery module in the auxiliary discharging mode are controlled to be discharged orderly. When the design of the power battery is selected, the requirement on the maximum output power of a single battery module can be reduced under the condition that the designed high-power electricity consumption requirement of the whole vehicle can be met. For example, for a four-motor vehicle, the maximum battery discharge power corresponding to the battery module SOC2 may satisfy the following requirements: the maximum discharge power of the first battery module when the SOC is larger than the main discharge cut-off threshold value and the maximum discharge power of the second battery module when the SOC is larger than the main discharge cut-off threshold value are both larger than the left front motor peak power + the right front motor peak power or are both larger than the left rear motor peak power + the right rear motor peak power.
In yet another embodiment, the power system includes a first battery module and a second battery module of the same specification, the first battery module having a current discharge mode that is a main discharge mode, and the second battery module having a current discharge mode that is an auxiliary discharge mode. The method further comprises the steps of:
And when the power system is in a battery feedback state, controlling the first battery module and the second battery module to receive electric feedback according to the current SOC and the maximum feedback power of the first battery module and the second battery module.
The battery feedback state refers to a state when the vehicle converts kinetic energy of the vehicle into electric energy through electric braking and charges the battery. The maximum feedback power refers to the maximum power that the battery module can absorb electric energy when the power system is in the battery feedback state, in other words, the maximum charging power of the battery module when the motor is used as a generator to charge the battery module. The maximum feedback power can be preset by a research and development personnel according to the characteristics of the battery and aiming at the SOCs of different battery modules with different temperatures. For example, the developer may preset the same temperature according to the characteristics of the battery, and the higher the SOC of the battery module, the lower the maximum feedback power of the battery module. In this embodiment, the reception of the electric feedback by the first battery module and/or the second battery module may be controlled according to the magnitude relation between the feedback electric power generated by the electric brake of the vehicle and the current maximum feedback power of the first battery module, the current maximum feedback power of the second battery module, and the magnitudes of the SOC of the first battery module and the SOC of the second battery module. The feedback electric power is the power of feedback electric energy generated by electric braking of the vehicle.
For example, when the vehicle generates electric energy through electric braking, the battery module with smaller SOC in the first battery module and the second battery module is preferentially controlled to receive electric feedback; when the maximum feedback power of the battery module with smaller SOC in the first battery module and the second battery module is smaller than the feedback electric power generated by the electric braking of the vehicle, the battery module with smaller SOC in the first battery module and the second battery module is controlled to receive the electric feedback with the maximum feedback power, and the battery module with larger SOC in the first battery module and the second battery module is controlled to receive the electric feedback with the maximum feedback power of the battery module with smaller SOC in the first battery module and the second battery module as a limit and with the difference value of the feedback electric power generated by the electric braking of the vehicle and the maximum feedback power of the battery module with smaller SOC in the first battery module and the second battery module.
In this embodiment, when the vehicle is braked, the feedback electric energy received by each of the plurality of battery modules can be distributed according to the respective requirements and capacities of the plurality of battery modules, so that the range of the vehicle can be prolonged.
In yet another embodiment, controlling the first and second battery modules to receive electrical feedback based on the current SOC and maximum feedback power of the first and second battery modules includes:
1) If the SOC of the first battery module is smaller than a preset charge permission threshold value and the feedback electric power generated by the electric braking of the vehicle is smaller than the current maximum feedback power of the first battery module, the first battery module is controlled to absorb the feedback electric energy;
2) If the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the current maximum feedback power of the first battery module and smaller than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, the first battery module is controlled to absorb the feedback electric energy with the maximum feedback power, and the second battery module is controlled to absorb the feedback electric energy with the difference between the feedback electric power and the maximum feedback power;
3) If the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, and the first battery module and the second battery module are controlled to absorb the feedback electric energy with the maximum feedback power;
4) If the SOC of the first battery module is larger than the charge permission threshold, and the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is smaller than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy;
5) If the SOC of the first battery module is larger than the charge permission threshold, and the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is larger than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy with the maximum feedback power;
6) And if the SOC of the first battery module and the SOC of the second battery module are both larger than the charge permission threshold, controlling the first battery module and the second battery module not to absorb the feedback electric energy.
The charge permission threshold is preset by the designer. For example, in order to protect the battery module and prevent the battery module from being overcharged, the designer may set the charge permission threshold to 97% in advance. In the case where the SOC of the battery module is greater than the charge permission threshold, the battery module is not permitted to receive the electrical feedback.
In this embodiment, a specific control strategy is provided for the battery module to absorb vehicle electric braking to generate feedback electric energy. In this embodiment, the battery module (the first battery module) in the main discharging mode is preferentially used to absorb the electric energy generated by the electric brake of the vehicle, so that the feedback electric energy is charged into the battery module in the main discharging mode as much as possible, the time for the SOC of the battery module in the main discharging mode to be consumed to the discharge cut-off threshold can be prolonged, the switching frequency of the discharging mode of the battery module can be reduced, and the control strategy can be simplified. In addition, a charging permission threshold is set, and feedback electric energy is not allowed to be absorbed when the battery module reaches the charging permission threshold, so that overcharge of the battery module is avoided, a battery is protected, and the service life of the battery is prolonged.
In yet another embodiment, a power system includes a first battery module and a second battery module of the same gauge. The method further comprises the steps of:
when the power system is in a battery charging state, if the electric energy from the two charging guns is received and the SOC of the first battery module is smaller than the SOC of the second battery module, the two charging guns are controlled to charge the first battery module at the same time, and when the SOC of the first battery module is equal to the SOC of the second battery module, the two charging guns are controlled to charge the first battery module and the second battery module respectively;
when the power system is in a battery charging state, if electric energy from one charging gun is received and the SOC of the first battery module is smaller than that of the second battery module, controlling the charging gun to charge the first battery module until the first battery module jumps from constant power charging to constant current charging, and controlling the charging gun to charge the second battery module; and if the second battery module is fully charged, controlling a charging gun to charge the first battery module.
Constant power charging and constant current charging are two ways of charging a battery. The characteristics of constant power charging and the characteristics of constant current charging are well known to those skilled in the art and will not be described in detail herein.
In this embodiment, steps and sequencing are provided for controlling the charging guns to charge the first and second battery modules for the case where the battery modules in the power system receive power from both charging guns and receive power from one charging gun.
In the case where the two charging guns charge the battery modules in the power system at the same time, the battery module having the lower SOC is charged preferentially until the SOCs of the two battery modules are equal. Therefore, under the condition that the two charging guns charge the two battery modules at the same time, the two battery modules can be fully charged at the same time, and the time for a user to wait for the battery modules to be charged is reduced.
Under the condition that one charging gun charges a battery module in a power system, the charging gun is controlled to charge the battery module with smaller SOC in a constant power charging mode in the early stage of the charging process until the battery module needs to be converted into charge with constant current, the battery module is converted into another battery module for charging, and the battery module is converted into charge after the battery module is fully charged. Like this, can charge two battery modules to higher electric quantity level fast, reduce the number of times that charge mode in a battery module switches (constant power charge switches into constant current charge) to reduce the number of times that switches between two battery modules, make the user need use the time when the vehicle charges midway, the electric quantity of storing of two battery modules is higher, and the distance that the user can go out is farther. When one of them battery module charges and accomplishes, need not the manual work to pull out the rifle that charges from a mouth that charges and change to another mouth that charges, promoted user experience.
In yet another embodiment, a power system includes a front motor for driving front wheels and a rear motor for driving rear wheels, controlling a plurality of battery modules to discharge in respective updated discharge modes, comprising:
controlling a plurality of battery modules to supply power to the front motor under the condition that the current required torque of the vehicle is smaller than the maximum output torque of the front motor and the current traction required power of the vehicle is smaller than the maximum traction power of the front motor;
under the condition of starting the vehicle, controlling a plurality of battery modules to supply power to the front motor and the rear motor;
in the case of a front wheel slip of the vehicle, a plurality of battery modules are controlled to supply power to the rear motor.
The maximum output torque refers to the maximum torque that the motor can output. The maximum traction power refers to the mechanical power that the motor can output for vehicle traction. The requested torque refers to the sum of the torques that the vehicle requires one or more electric machines to output in order to meet the current operating conditions of the vehicle. Traction demand power refers to the sum of the mechanical power output by one or more electric machines required by the vehicle for traction to meet the current operating conditions of the vehicle.
In this embodiment, the battery module in the power system is used to supply power to the front motor preferentially, so that the power system drives the front wheel of the vehicle to drive the vehicle preferentially by using the front motor, and when the maximum output torque of the front motor is smaller than the current required torque of the vehicle or the maximum traction power of the front motor is smaller than the current traction required power of the vehicle, the battery module in the power system is controlled to supply power to the front motor and also to supply power to the rear motor simultaneously so as to meet the current torque requirement and the current traction power requirement of the vehicle. This simplifies the control strategy in situations where the current torque demand and current traction power demand of the vehicle can be met. In the embodiment, under the condition that the front wheels of the vehicle slide, the rear wheels are used for driving the vehicle, and the driving strategy of the vehicle is optimized in combination with the actual application scene, so that the use experience of a user is improved.
In yet another embodiment, the method further comprises:
under the condition that the maximum electric braking force of the front motor is larger than the braking force required by the whole vehicle, controlling the front motor to perform electric braking feedback;
and under the condition that the maximum electric braking force of the front motor is smaller than the required braking force of the whole vehicle, controlling the front motor and the rear motor to perform electric braking feedback.
The maximum electric braking force refers to the maximum braking force which can be generated by electric braking in the process of taking electric braking measures under the current vehicle speed of the motor. The braking force required by the whole vehicle is braking force which corresponds to the operation behavior of the user and is required for meeting the driving wish of the user.
In the embodiment, a strategy of preferentially using the front motor for electric braking is provided, so that under the condition that the electric braking force generated by independently using the front motor for braking can meet the braking force required by the whole vehicle, the front motor is independently braked, compared with the mode that the front motor and the rear motor are braked simultaneously, the electric braking measures are taken, the number of motors used for electric braking is reduced, and the control strategy of electric braking is simplified.
Based on the same inventive concept, the present disclosure also provides a control device of a power system for performing the steps of the control method of the power system described above.
Based on the same inventive concept, the present disclosure also provides a power system. Fig. 4 is a schematic diagram of a power system according to an exemplary embodiment. The power system comprises the control device of the power system. As shown in fig. 4, the power system further includes a first battery module 1, a second battery module 2, a first charging port 3, a second charging port 4, a first OBC (On-board charger) 5, a second OBC6, a first front motor 7, a second front motor 8, a first rear motor 9, and a second rear motor 10.
The control device includes a whole vehicle controller 11, a first BMS (Battery Management System ) 12, a second BMS13, a first front motor controller 14, a second front motor controller 15, a first rear motor controller 16, and a second rear motor controller 17, which are respectively connected with the whole vehicle controller 11. That is, the control method in the embodiment of fig. 1 may be commonly performed by the vehicle controller 11, the first BMS12, the second BMS13, the first front motor controller 14, the second front motor controller 15, the first rear motor controller 16, and the second rear motor controller 17.
The first front motor 7 and the second front motor 8 are used to drive the two front wheels of the vehicle, respectively, and the first rear motor 9 and the second rear motor 10 are used to drive the two rear wheels of the vehicle, respectively.
The first charging port 3 is connected with the first OBC5 and is used for inserting a charging gun, and the second charging port 4 is connected with the second OBC6 and is used for inserting the charging gun.
The first BMS12 is connected to the first OBC5 and the first battery module 1, respectively, and is connected to the first front motor 7 through the first front motor controller 14, to the second front motor 8 through the second front motor controller 15, to the first rear motor 9 through the first rear motor controller 16, and to the second rear motor 10 through the second rear motor controller 17. The first BMS12 may be connected to the first front motor controller 14 and the second front motor controller 15 through the first boosting device 18, respectively.
The second BMS13 is connected to the second OBC6 and the second battery module 2, respectively, and is connected to the first front motor 7 through the first front motor controller 14, to the second front motor 8 through the second front motor controller 15, to the first rear motor 9 through the first rear motor controller 16, and to the second rear motor 10 through the second rear motor controller 17. The second BMS13 may be connected to the first and second rear motor controllers 16 and 17 through the second boosting device 19, respectively.
The first BMS12 and the second BMS13 may also be connected to a high voltage consumer 20 and to a low voltage consumer 22 through a voltage reducing device 21.
As for the type of battery module (the specifications of the first battery module 1 and the second battery module 2 are the same), a battery module (either one of the first battery module 1 and the second battery module 2 meets the above requirements) in which the maximum output power can be larger than the sum of the peak power of the first front motor 7 and the peak power of the second front motor 8 and larger than the sum of the peak power of the first rear motor 9 and the peak power of the second rear motor 10 when the SOC is at the discharge cutoff threshold may be selected. The peak power refers to the input power of the motor when the power consumption is maximum in the working process.
Both the first charging port 3 and the second charging port 4 can be used for inserting a charging gun. When the first charging port 3 is inserted into the charging gun, the first battery module 1 and the second battery module 2 can be charged by converting electric energy from the charging gun through the first OBC 5; when the second charging port 4 is inserted into the charging gun, the second OBC6 can convert the electric energy from the charging gun to charge the first battery module 1 and the second battery module 2; when both the first charging port 3 and the second charging port 4 are inserted into the charging guns, electric energy from both charging guns can be charged into one of the first battery module 1 and the second battery module 2 at the same time, and electric energy from both charging guns can be charged into the corresponding battery modules (for example, the first charging port 3 corresponds to the first battery module 1 and the second charging port 4 corresponds to the second battery module 2).
During operation of the vehicle, the first battery module 1 may supply power to one or more of the first front motor 7, the second front motor 8, the first rear motor 9, and the second rear motor 10; the second battery module 2 may supply power to one or more of the first front motor 7, the second front motor 8, the first rear motor 9, and the second rear motor 10. The first battery module 1 and the second battery module 2 may each individually supply one or more of the first front motor 7, the second front motor 8, the first rear motor 9, and the second rear motor 10. For example, the second battery module 2 separately supplies power to the first front motor 7 and the second front motor 8 simultaneously; for example, the second battery module 2 supplies power to the first front motor 7, the second front motor 8, the first rear motor 9, and the second rear motor 10 separately.
The first battery module 1 and the second battery module 2 may also simultaneously supply one or more of the first front motor 7, the second front motor 8, the first rear motor 9, the second rear motor 10. For example, the first battery module 1 and the second battery module 2 are simultaneously discharged to simultaneously supply power to the four motors of the first front motor 7, the second front motor 8, the first rear motor 9, and the second rear motor 10.
In the embodiment, the power system of the vehicle comprises two battery modules and four motors for driving wheels, the driving capability of the power system is stronger, and the use requirements of the vehicle under special working conditions such as climbing, obstacle surmounting, desert cross-country and the like can be better met. Either of the two battery modules may independently power the two front motors, the two rear motors, or the four motors simultaneously, so that when one of the two battery modules fails, the power system of the vehicle can still function normally under normal conditions (e.g., traveling on an urban road). The two front motors and the two rear motors arranged in the power system are used for driving corresponding wheels, and when the two front motors or the two rear motors fail, the motor-driven vehicle which works normally can still be used (for example, when the two front motors fail, the two rear motors are used for driving the vehicle). In addition, two charging ports are arranged in the power system, and when the two charging ports are inserted into the charging gun, the battery module can be charged more quickly; when any one of the two charging ports inserts into the charging gun, the charging gun can be also efficiently charged for the two battery modules (the first battery module and the second battery module), but when only one charging gun is arranged, a user can insert the charging gun into any one charging port to charge the battery modules, when one battery module is charged, the position of the charging gun is not required to be replaced to the other charging port, and the user experience is improved.
The disclosure also provides a vehicle equipped with the power system.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (12)
1. A control method of a power system, wherein the power system includes a plurality of battery modules, the method comprising:
periodically acquiring the SOCs of the plurality of battery modules when the power system is in a battery discharging state;
Updating a discharge mode of each battery module according to the SOCs of the plurality of battery modules, wherein the discharge mode comprises a main discharge mode and an auxiliary discharge mode, and the battery module in the main discharge mode discharges preferentially than the battery module in the auxiliary discharge mode;
and controlling the plurality of battery modules to discharge according to the respective updated discharge modes.
2. The method of claim 1, wherein the power system includes a first battery module and a second battery module of the same specification, the current discharge mode of the first battery module is the main discharge mode, the current discharge mode of the second battery module is the auxiliary discharge mode, and updating the discharge mode of each battery module according to the SOC of the plurality of battery modules includes:
updating the discharge mode of the first battery module to the main discharge mode and updating the discharge mode of the second battery module to the auxiliary discharge mode in any of the following cases:
the SOC of the first battery module is larger than a preset main discharge cut-off threshold value;
the SOCs of the first battery module and the second battery module are both larger than a preset discharge cut-off threshold value and are both smaller than the main discharge cut-off threshold value;
The discharge mode of the first battery module is updated to the auxiliary discharge mode, and the discharge mode of the second battery module is updated to the main discharge mode in the following cases:
the SOC of the first battery module is larger than the discharge cut-off threshold and smaller than the main discharge cut-off threshold, and the SOC of the second battery module is larger than the main discharge cut-off threshold.
3. The method of claim 2, wherein the discharge mode further comprises a disable discharge mode, the updating the discharge mode of each battery module according to the SOC of the plurality of battery modules further comprising:
if the first battery module fails or the SOC of the first battery module is less than the discharge cutoff threshold, the discharge mode of the first battery module is updated to the discharge forbidden mode, the discharge mode of the second battery module is updated to the main discharge mode, and the discharge mode of the second battery module is updated to the discharge forbidden mode until the SOC of the second battery module is less than the discharge cutoff threshold.
4. The method of claim 2, wherein the controlling the plurality of battery modules to discharge according to respective updated discharge patterns comprises:
If the required power of the power system is smaller than the maximum output power of the first battery module, controlling the first battery module to output the required power;
if the required power of the power system is larger than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module and the second battery module to output respective maximum output power;
and if the required power of the power system is larger than the maximum output power of the first battery module and smaller than the sum of the maximum output power of the first battery module and the maximum output power of the second battery module, controlling the first battery module to output the maximum output power and controlling the second battery module to output the difference between the required power and the output power of the first battery module.
5. The method of claim 1, wherein the power system includes a first battery module and a second battery module of the same specification, the first battery module current discharge mode being the main discharge mode, the second battery module current discharge mode being the auxiliary discharge mode, the method further comprising:
And when the power system is in a battery feedback state, controlling the first battery module and the second battery module to receive electric feedback according to the current SOC and the maximum feedback power of the first battery module and the second battery module.
6. The method of claim 5, wherein the controlling the first battery module and the second battery module to receive electrical feedback based on the current SOC and the maximum feedback power of the first battery module and the second battery module comprises:
if the SOC of the first battery module is smaller than a preset charge permission threshold value and the feedback electric power generated by vehicle electric braking is smaller than the current maximum feedback power of the first battery module, the first battery module is controlled to absorb the feedback electric energy;
if the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the current maximum feedback power of the first battery module and smaller than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, the first battery module is controlled to absorb feedback electric energy with the maximum feedback power, and the second battery module is controlled to absorb feedback electric energy with the difference between the feedback electric power and the maximum feedback power;
If the SOC of the first battery module is smaller than the charge permission threshold, the feedback electric power is larger than the sum of the current maximum feedback power of the first battery module and the current maximum feedback power of the second battery module, and both the first battery module and the second battery module are controlled to absorb feedback electric energy with the maximum feedback power;
if the SOC of the first battery module is larger than the charge permission threshold, the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is smaller than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy;
if the SOC of the first battery module is larger than the charge permission threshold, the SOC of the second battery module is smaller than the charge permission threshold, and the feedback electric power is larger than the current maximum feedback power of the second battery module, the second battery module is controlled to absorb the feedback electric energy with the maximum feedback power;
and if the SOC of the first battery module and the SOC of the second battery module are both larger than the charge permission threshold, controlling the first battery module and the second battery module not to absorb feedback electric energy.
7. The method of claim 1, wherein the power system includes a first battery module and a second battery module of the same gauge, the method further comprising:
when the power system is in a battery charging state, if electric energy from two charging guns is received and the SOC of the first battery module is smaller than that of the second battery module, the two charging guns are controlled to charge the first battery module at the same time until the SOC of the first battery module is equal to that of the second battery module, and the two charging guns are controlled to charge the first battery module and the second battery module respectively;
when the power system is in a battery charging state, if electric energy from one charging gun is received and the SOC of the first battery module is smaller than that of the second battery module, the one charging gun is controlled to charge the first battery module until the first battery module jumps from constant power charging to constant current charging, and the one charging gun is controlled to charge the second battery module; and if the second battery module is fully charged, controlling the charging gun to charge the first battery module.
8. The method of claim 1, wherein the power system includes a front motor for driving front wheels and a rear motor for driving rear wheels, the controlling the plurality of battery modules to discharge according to respective updated discharge patterns, comprising:
controlling the plurality of battery modules to supply power to the front motor when the current required torque of the vehicle is less than the maximum output torque of the front motor and the current traction required power of the vehicle is less than the maximum traction power of the front motor;
controlling the plurality of battery modules to supply power to the front motor and the rear motor under the condition that the vehicle starts;
the plurality of battery modules is controlled to supply power to the rear motor in the event of a front wheel slip of the vehicle.
9. The method of claim 8, wherein the method further comprises:
controlling the front motor to perform electric braking feedback under the condition that the maximum electric braking force of the front motor is larger than the braking force required by the whole vehicle;
and under the condition that the maximum electric braking force of the front motor is smaller than the required braking force of the whole vehicle, controlling the front motor and the rear motor to carry out electric braking feedback.
10. A control device of a power system, characterized in that the control device is adapted to perform the steps of the control method of a power system according to any one of claims 1-9.
11. A power system, characterized by comprising a control device according to claim 10, a first battery module (1), a second battery module (2), a first charging port (3), a second charging port (4), a first OBC (5), a second OBC (6), a first front motor (7), a second front motor (8), a first rear motor (9) and a second rear motor (10);
the control device comprises a whole vehicle controller (11), a first BMS (12), a second BMS (13), a first front motor controller (14), a second front motor controller (15), a first rear motor controller (16) and a second rear motor controller (17), wherein the first BMS (12), the second BMS (13), the first front motor controller (14), the second front motor controller (15), the first rear motor controller (16) and the second rear motor controller (17) are respectively connected with the whole vehicle controller (11);
the first front motor (7) and the second front motor (8) are respectively used for driving two front wheels of a vehicle, and the first rear motor (9) and the second rear motor (10) are respectively used for driving two rear wheels of the vehicle;
the first charging port (3) is connected with the first OBC (5) and is used for being inserted into a charging gun, and the second charging port (4) is connected with the second OBC (6) and is used for being inserted into the charging gun;
The first BMS (12) is respectively connected with the first OBC (5) and the first battery module (1), is connected with the first front motor (7) through the first front motor controller (14), is connected with the second front motor (8) through the second front motor controller (15), is connected with the first rear motor (9) through the first rear motor controller (16), and is connected with the second rear motor (10) through the second rear motor controller (17);
the second BMS (13) is respectively connected with the second OBC (6) and the second battery module (2), and is connected with the first front motor (7) through the first front motor controller (14), is connected with the second front motor (8) through the second front motor controller (15), is connected with the first rear motor (9) through the first rear motor controller (16), and is connected with the second rear motor (10) through the second rear motor controller (17).
12. A vehicle having the power system of claim 11 mounted thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210784891.9A CN117341533A (en) | 2022-06-29 | 2022-06-29 | Control method and device of power system, power system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210784891.9A CN117341533A (en) | 2022-06-29 | 2022-06-29 | Control method and device of power system, power system and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117341533A true CN117341533A (en) | 2024-01-05 |
Family
ID=89354585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210784891.9A Pending CN117341533A (en) | 2022-06-29 | 2022-06-29 | Control method and device of power system, power system and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117341533A (en) |
-
2022
- 2022-06-29 CN CN202210784891.9A patent/CN117341533A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6419992B2 (en) | Hybrid energy storage module system | |
| US6275004B1 (en) | System for battery module balancing via variable voltage DC-DC converter in a hybrid-electric powertrain | |
| EP3463963B1 (en) | Electric vehicle battery management apparatus and method | |
| US7791216B2 (en) | Method and system for use with a vehicle electric storage system | |
| CN108099614B (en) | Method for controlling motor system of eco-friendly vehicle | |
| JP6070934B2 (en) | Hybrid vehicle travel mode switching control device | |
| CN102985279B (en) | Battery-capacity management device | |
| CN107539151B (en) | Charging and battery-replacing integrated power battery system, working method and application | |
| KR101449266B1 (en) | Control method of Low DC/DC Converter for electric vehicle, and Low DC/DC Converter control system using the same | |
| EP2938514A2 (en) | Dual function battery system and method | |
| CN102381314A (en) | Charge-discharge control method for hybrid electric vehicle | |
| CN113937863B (en) | Battery equalization strategy for hybrid system and hybrid vehicle | |
| CN1871146B (en) | Electrical power supply system with two rechargeable batteries for supplying electrical motor | |
| CN106004858B (en) | Torque assist based on battery state of charge allocation | |
| US20220209544A1 (en) | Battery system and controlling method of the same | |
| KR101655665B1 (en) | System and Method for controlling variable voltage of Low voltage DC-DC Converter at regen mode of hybrid vehicle | |
| JP2013198179A (en) | Vehicle controller and vehicle | |
| US20110163724A1 (en) | Method and device for monitoring a hybrid vehicle power storage system | |
| CN114389323A (en) | Method for reducing the total power consumption of a parked vehicle | |
| WO2020202772A1 (en) | Vehicle control unit | |
| CN106004859B (en) | Vehicle performance preload enabler | |
| JP5078525B2 (en) | How to install a running battery in a hybrid car | |
| KR100579298B1 (en) | Auxiliary battery charge control method for environment car | |
| CN117341533A (en) | Control method and device of power system, power system and vehicle | |
| KR20200054512A (en) | Braking control system and method for environmental-friendly vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |