CN113525097B - Control method for low-voltage energy recovery, whole vehicle controller, system and vehicle - Google Patents
Control method for low-voltage energy recovery, whole vehicle controller, system and vehicle Download PDFInfo
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- CN113525097B CN113525097B CN202010315333.9A CN202010315333A CN113525097B CN 113525097 B CN113525097 B CN 113525097B CN 202010315333 A CN202010315333 A CN 202010315333A CN 113525097 B CN113525097 B CN 113525097B
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Classifications
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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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
- B60L1/20—Energy regeneration from auxiliary equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention provides a control method for low-voltage energy recovery, a whole vehicle controller, a system and a vehicle, wherein the control method comprises the following steps: when the vehicle is in a high-voltage energy recovery state according to the vehicle state information, acquiring the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor; when the maximum allowable charging current is smaller than the whole vehicle energy feedback current, a low-voltage energy recovery starting signal is sent to the motor controller, and the motor controller is controlled to switch on a circuit between the motor and the direct current-direct current converter. According to the technical scheme, when the vehicle is in a high-voltage energy recovery state and the maximum allowable charging current of the power battery is smaller than the whole vehicle energy feedback current output by the motor, the low-voltage energy recovery is started, and the redundant recovered energy is directly transmitted to the direct-current-direct-current converter, so that the recovered energy is fully utilized, the utilization rate of the recovered energy is improved, and the waste of the recovered energy is reduced or even avoided.
Description
Technical Field
The invention relates to the technical field of energy recovery of electric automobiles, in particular to a control method for low-voltage energy recovery, a whole vehicle controller, a system and a vehicle.
Background
As vehicle technology develops, energy recovery technology is increasingly being applied to vehicles, particularly electric vehicles. When the electric automobile slides or brakes under a driving gear such as a D gear, an S gear or an E gear, a part of mechanical energy is converted into electric energy through a motor and stored into a power battery, and the electric energy is supplied to electric equipment of the whole automobile for use, so that conversion and recovery of braking energy are realized.
However, the energy recovery of the whole vehicle is only limited to high-voltage energy recovery, and when the recovery current is larger than the maximum allowable charging current of the power battery, the redundant energy cannot be recovered and reused, so that energy waste is caused. How to avoid or reduce energy waste is one of the problems that the skilled person needs to solve.
Disclosure of Invention
The embodiment of the invention aims to provide a control method, a whole vehicle controller, a system and a vehicle for low-voltage energy recovery, which are used for solving the problem that the energy recovery of the current vehicle is only limited to high-voltage energy recovery, and energy waste is caused when the recovery current is large.
In order to solve the above technical problems, an embodiment of the present invention provides a control method for low-voltage energy recovery, including:
acquiring vehicle state information of a vehicle in running, and judging whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
when the vehicle is in a high-voltage energy recovery state according to the vehicle state information, acquiring the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor;
comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
when the comparison result shows that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, a low-voltage energy recovery starting signal is sent to the motor controller, and the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and the direct-current-direct-current converter.
Preferably, the control method as described above, after the step of transmitting the low-voltage energy recovery start signal to the motor controller, further includes:
acquiring current required by a whole vehicle load, allowable charging current of a storage battery and low-voltage energy recovery current output by a motor to a direct current-direct current converter;
determining the required current of the power battery output to the direct current-direct current converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the energy recovery current of the storage battery;
and generating a control signal according to the required current and sending the control signal to a battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output by the power battery to the DC-DC converter according to the required current.
Further, in the control method as described above, after the step of sending the low-voltage energy recovery start signal to the motor controller, the control method further includes:
and acquiring the storage battery state information detected by the storage battery sensor, and sending the storage battery state information and a first low-voltage energy recovery display signal to the combination instrument, wherein the first low-voltage energy recovery display signal is used for controlling the combination instrument to display the low-voltage energy recovery starting and the storage battery state information.
Specifically, the control method as described above further includes:
when the maximum allowable charging current is detected to be equal to or greater than the whole vehicle energy feedback current, a low-voltage energy recovery cut-off signal is sent to the motor controller, and the low-voltage energy recovery cut-off signal is used for controlling the motor controller to disconnect a circuit between the motor and the direct-current-direct-current converter.
Preferably, the control method as described above, after the step of transmitting the low-voltage energy recovery cutoff signal to the motor controller, further includes:
and sending a second low-voltage energy recovery display signal to the combination instrument, wherein the second low-voltage energy recovery display signal is used for controlling the combination instrument to display that the low-voltage energy recovery is closed.
Another preferred embodiment of the present invention further provides a vehicle controller, including:
the first processing module is used for acquiring vehicle state information of the vehicle in running and judging whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
the second processing module is used for acquiring the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor when the vehicle is in the high-voltage energy recovery state according to the vehicle state information;
the third processing module is used for comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
and the fourth processing module is used for sending a low-voltage energy recovery starting signal to the motor controller when the comparison result shows that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, and the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and the direct current-direct current converter.
Preferably, the vehicle controller as described above further includes:
the acquisition module is used for acquiring current required by the load of the whole vehicle, allowable charging current of the storage battery and low-voltage energy recovery current output by the motor to the direct-current-direct-current converter;
the fifth processing module is used for determining the required current of the power battery output to the direct current-direct current converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the low-voltage energy recovery current;
and the sixth processing module is used for generating a control signal according to the required current and sending the control signal to the battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output by the power battery to the DC-DC converter according to the required current.
Specifically, the vehicle control unit as described above further includes:
and the seventh processing module is used for acquiring the storage battery state information detected by the storage battery sensor and sending the storage battery state information and a first low-voltage energy recovery display signal to the combination instrument, wherein the first low-voltage energy recovery display signal is used for controlling the combination instrument to display the low-voltage energy recovery starting and the storage battery state information.
Preferably, the vehicle controller as described above further includes:
and the eighth processing module is used for sending a low-voltage energy recovery cut-off signal to the motor controller when the maximum allowable charging current is detected to be equal to or larger than the whole vehicle energy feedback current, wherein the low-voltage energy recovery cut-off signal is used for controlling the motor controller to disconnect a circuit between the motor and the direct current-direct current converter.
Further, the vehicle controller as described above further includes:
and the ninth processing module is used for sending a second low-voltage energy recovery display signal to the combination instrument, wherein the second low-voltage energy recovery display signal is used for controlling the combination instrument to display that the low-voltage energy recovery is closed.
Still another preferred embodiment of the present invention provides a control system for low-voltage energy recovery, including:
the system comprises a battery management system, a motor controller, a direct current-direct current converter, a motor, a power battery, a storage battery and a whole vehicle controller as described above;
the whole vehicle controller is respectively in communication connection with the battery management system and the motor controller;
the battery management system is also connected with the power battery;
the motor controller is also connected with the motor;
the direct current-direct current converter is respectively connected with the motor, the power battery, the storage battery and the whole vehicle load.
Specifically, the control system as described above further includes: a combination meter;
the combination instrument is in communication connection with the whole vehicle controller.
Preferably, the control system as described above further comprises: at least one of an accelerator pedal sensor, a brake pedal sensor, a gear sensor, an electronic parking system, a brake anti-lock system, a storage battery sensor and a vehicle body controller which are connected with the whole vehicle controller.
There is also provided in a further preferred embodiment of the present invention a vehicle including: a control system for low pressure energy recovery as described above.
Compared with the prior art, the control method, the whole vehicle controller, the system and the vehicle for low-voltage energy recovery provided by the embodiment of the invention have the following beneficial effects:
according to the technical scheme, the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor are obtained and compared when the vehicle is in a high-voltage energy recovery state, and when the maximum allowable charging current is smaller than the whole vehicle energy feedback current, the energy recovery capacity of the vehicle is determined to exceed the energy receiving capacity of the power battery, a low-voltage energy recovery starting signal is sent to the motor controller, the motor controller is enabled to be connected with a circuit between the motor and the direct current-direct current converter to conduct low-voltage energy recovery, redundant recovered energy is directly transmitted to the direct current-direct current converter, the direct current-direct current converter converts the energy into power for a whole vehicle load and a storage battery, and the storage battery stores the received energy, so that the recovered energy is fully utilized, the utilization rate of the recovered energy is improved, and the waste of the recovered energy is reduced or even avoided.
Drawings
FIG. 1 is a schematic flow chart of a control method for low pressure energy recovery according to the present invention;
FIG. 2 is a second flow chart of the control method of low-pressure energy recovery according to the present invention;
FIG. 3 is a schematic diagram of a vehicle control unit according to the present invention;
fig. 4 is a schematic structural diagram of the control system for low-voltage energy recovery according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the invention. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the examples provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
Referring to fig. 1, a preferred embodiment of the present invention provides a control method for low pressure energy recovery, comprising:
step S101, acquiring vehicle state information of a vehicle in running, and judging whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
step S102, when the vehicle is in a high-voltage energy recovery state according to the vehicle state information, acquiring the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor;
step S103, comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
step S104, when the comparison result is that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, a low-voltage energy recovery starting signal is sent to the motor controller, and the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and the direct current-direct current converter.
In a preferred embodiment of the present invention, when the vehicle is in a driving state, the vehicle can perform energy recovery during coasting or braking, at this time, whether the vehicle is in a high-voltage energy recovery state can be determined according to the acquired vehicle state information, when the vehicle is determined to be in the high-voltage energy recovery state, in order to determine whether the energy recovery capacity of the current vehicle exceeds the energy receiving capacity of the power battery, at this time, the maximum allowable charging current of the power battery is acquired to represent the energy receiving capacity of the power battery, the whole vehicle energy feedback current generated by the vehicle performing energy recovery represents the energy recovery capacity of the vehicle, and the maximum allowable charging current and the whole vehicle energy feedback current are compared, so that whether the energy recovery capacity of the vehicle exceeds the energy receiving capacity of the power battery can be determined according to the comparison result; when the comparison result is that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, the energy recovery capability of the vehicle can be determined to exceed the energy receiving capability of the power battery, only high-voltage energy recovery is performed at the moment to cause partial energy waste, so that a low-voltage energy recovery starting signal is sent to the motor controller, the motor controller is enabled to be connected with a circuit between the motor and the direct-current-direct-current converter to perform low-voltage energy recovery, redundant recovered energy is directly transmitted to the direct-current-direct-current converter, the direct-current-direct-current converter is used for converting the surplus energy into power for the whole vehicle load and the storage battery, and the storage battery stores the received energy, so that the recovered energy is fully utilized, the utilization rate of the recovered energy is improved, and the waste of the recovered energy is reduced or even avoided.
Referring to fig. 2, preferably, the control method as described above, after the step of transmitting the low-voltage energy recovery start signal to the motor controller, further includes:
step S201, obtaining current required by the load of the whole vehicle, allowable charging current of a storage battery and low-voltage energy recovery current output by a motor to a DC-DC converter;
step S202, determining the required current of the power battery output to the DC-DC converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the low-voltage energy recovery current;
step S203, a control signal is generated according to the required current and sent to the battery management system, where the control signal is used to control the battery management system to adjust the current output from the power battery to the dc-dc converter according to the required current.
In a preferred embodiment of the present invention, after a low voltage energy recovery start signal is sent to the motor controller to start low voltage energy recovery, a current required by a load of the whole vehicle, a charging current allowed by the storage battery and a low voltage recovery current are obtained, wherein the current required by the load of the whole vehicle and the charging current allowed by the storage battery form a total output current of the dc-dc converter, the low voltage energy recovery current and a required current output by the power battery to the dc-dc converter form a total input current of the dc-dc converter, so that the required current output by the power battery to the dc-dc converter can be determined according to a relation that the total output current is equal to the total input current, and then a control signal is generated according to the required current and sent to the battery management system to adjust the current output by the power battery to the dc-dc converter, thereby being beneficial to reducing the energy output of the power battery and improving the energy utilization rate on the basis of fully utilizing the recovered energy.
Further, in the control method as described above, after the step of sending the low-voltage energy recovery start signal to the motor controller, the control method further includes:
and acquiring the storage battery state information detected by the storage battery sensor, and sending the storage battery state information and a first low-voltage energy recovery display signal to the combination instrument, wherein the first low-voltage energy recovery display signal is used for controlling the combination instrument to display the low-voltage energy recovery starting and the storage battery state information.
In a specific embodiment of the invention, after low-voltage energy recovery is started, the storage battery state information detected by the storage battery sensor is also acquired, and the storage battery state information and the first low-voltage energy recovery display signal are sent to the combination instrument, so that the combination instrument displays the low-voltage energy recovery start and the storage battery state information of the current vehicle, a driver can intuitively and conveniently acquire the current vehicle state, and meanwhile, the driver can conveniently reduce the energy recovery capacity by reducing braking force and the like under the condition of ensuring safety, and the energy utilization rate is further improved. Specifically, the battery state information includes, but is not limited to: voltage, current, remaining power, battery state of health, etc.
Specifically, the control method as described above further includes:
when the maximum allowable charging current is detected to be equal to or greater than the whole vehicle energy feedback current, a low-voltage energy recovery cut-off signal is sent to the motor controller, and the low-voltage energy recovery cut-off signal is used for controlling the motor controller to disconnect a circuit between the motor and the direct-current-direct-current converter.
In a specific embodiment of the present invention, after the low-voltage energy recovery is started, when the maximum allowable charging current of the power battery is detected to be equal to or greater than the energy feedback current of the whole vehicle, it may be determined that the energy receiving capacity of the current power battery is equal to or greater than the energy recovery capacity of the vehicle, and the energy obtained by the energy recovery of the vehicle can be completely received only by the power battery, and at this time, a low-voltage energy recovery cut-off signal is sent to the motor controller, so that the circuit between the motor and the dc-dc converter is disconnected, and all the recovered energy is flushed into the power battery, thereby being beneficial to ensuring and improving the driving range of the vehicle.
Preferably, the control method as described above, after the step of transmitting the low-voltage energy recovery cutoff signal to the motor controller, further includes:
and sending a second low-voltage energy recovery display signal to the combination instrument, wherein the second low-voltage energy recovery display signal is used for controlling the combination instrument to display that the low-voltage energy recovery is closed.
In another preferred embodiment of the present invention, after sending the low-voltage energy recovery cut-off signal to the motor controller and controlling the circuit between the motor and the dc-dc converter to be disconnected, a second low-voltage energy recovery display signal is also sent to the combination meter, and the combination meter displays the information of the low-voltage energy recovery cut-off, so that the driver can know the low-voltage energy recovery cut-off in time, and further cancel the operation of reducing the energy recovery capability by reducing the braking force and the like.
Referring to fig. 3, another preferred embodiment of the present invention further provides a vehicle controller, including:
the first processing module 301 is configured to obtain vehicle state information of a vehicle during running, and determine whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
the second processing module 302 is configured to obtain a maximum allowable charging current of the power battery and a whole vehicle energy feedback current output by the motor when the vehicle is determined to be in a high-voltage energy recovery state according to the vehicle state information;
the third processing module 303 is configured to compare the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
the fourth processing module 304 is configured to send a low-voltage energy recovery start signal to the motor controller when the comparison result indicates that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, where the low-voltage energy recovery start signal is used to control the motor controller to switch on a circuit between the motor and the dc-dc converter.
Preferably, the vehicle controller as described above further includes:
the acquisition module is used for acquiring current required by the load of the whole vehicle, allowable charging current of the storage battery and low-voltage energy recovery current output by the motor to the direct-current-direct-current converter;
the fifth processing module is used for determining the required current of the power battery output to the direct current-direct current converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the low-voltage energy recovery current;
and the sixth processing module is used for generating a control signal according to the required current and sending the control signal to the battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output by the power battery to the DC-DC converter according to the required current.
Specifically, the vehicle control unit as described above further includes:
and the seventh processing module is used for acquiring the storage battery state information detected by the storage battery sensor and sending the storage battery state information and a first low-voltage energy recovery display signal to the combination instrument, wherein the first low-voltage energy recovery display signal is used for controlling the combination instrument to display the low-voltage energy recovery starting and the storage battery state information.
Preferably, the vehicle controller as described above further includes:
and the eighth processing module is used for sending a low-voltage energy recovery cut-off signal to the motor controller when the maximum allowable charging current is detected to be equal to or larger than the whole vehicle energy feedback current, wherein the low-voltage energy recovery cut-off signal is used for controlling the motor controller to disconnect a circuit between the motor and the direct current-direct current converter.
Further, the vehicle controller as described above further includes:
and the ninth processing module is used for sending a second low-voltage energy recovery display signal to the combination instrument, wherein the second low-voltage energy recovery display signal is used for controlling the combination instrument to display that the low-voltage energy recovery is closed.
The embodiment of the whole vehicle controller is the whole vehicle controller corresponding to the embodiment of the control method, and all the implementation means in the embodiment of the control method are applicable to the embodiment of the whole vehicle controller, so that the same technical effects can be achieved.
Referring to fig. 4, still another preferred embodiment of the present invention provides a control system for low pressure energy recovery, comprising:
battery management system 401, motor controller 402, dc-dc converter 403, motor 404, power battery 405, storage battery 406, and vehicle controller 407 as described above;
the whole vehicle controller 407 is respectively in communication connection with the battery management system 401 and the motor controller 402;
the battery management system 401 is also connected to a power battery 405;
the motor controller 402 is also connected to a motor 404;
the dc-dc converter 403 is connected to the motor 404, the power battery 405, the storage battery 406, and the vehicle load 416, respectively.
In a specific embodiment of the present invention, a control system for low-voltage energy recovery is provided, including the above-mentioned vehicle controller 407, where the vehicle controller 407 is respectively in communication connection with the battery management system 401 and the motor controller 402, and when it is determined that the vehicle is in a high-voltage energy recovery state, the maximum allowable charging current of the power battery 405 connected to the battery management system 401 is obtained through the battery management system 401, and the vehicle energy feedback current output by the motor 404 connected to the motor controller 402 is obtained through the motor controller 402; comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result; when the comparison result is that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, it can be determined that the energy recovery capability of the vehicle exceeds the energy receiving capability of the power battery 405, and only high-voltage energy recovery is performed at this time to cause partial energy waste, so that a low-voltage energy recovery start signal is sent to the motor controller 402, the motor controller 402 is enabled to switch on a circuit between the motor 404 and the direct current-direct current converter 403 to perform low-voltage energy recovery, redundant recovered energy is directly transmitted to the direct current-direct current converter 403, and the power is supplied to the whole vehicle load 418 and the storage battery 406 after the direct current-direct current converter 403 converts, and the storage battery 406 stores the received energy, so that the recovered energy is fully utilized, the utilization rate of the recovered energy is improved, and the recovered energy waste is reduced or even avoided.
The dc-dc converter 403 is connected to the motor 404, the power battery 405, the storage battery 406, and the whole vehicle load 418, so that the whole vehicle controller 407 can regulate the current output from the power battery 405 to the dc-dc converter 403 according to the total input current and the total output current of the dc-dc converter 403, thereby further improving the energy utilization.
Referring to fig. 4, specifically, the control system as described above further includes: a cluster 408;
the combination meter 408 is communicatively connected to the vehicle controller 407.
In an embodiment of the present invention, the control system further includes a combination meter 408, where the combination meter 408 is communicatively connected to the vehicle controller 407, so that the combination meter 408 can display specific contents according to a display signal sent by the vehicle controller 407, for example: displaying low-voltage energy recovery starting and acquired storage battery state information according to a first display signal for displaying low-voltage energy recovery starting; and displaying the low-voltage energy recovery cutoff and the like according to the second display signal for displaying the low-voltage energy recovery cutoff.
Referring to fig. 4, the control system as described above preferably further comprises: at least one of an accelerator pedal sensor 409, a brake pedal sensor 410, a gear sensor 411, an electronic parking system 412, a brake antilock system 413, a battery sensor 414, and a vehicle body controller 415, which are connected to the vehicle controller 407.
In another preferred embodiment of the present invention, the control system may further include: an accelerator pedal sensor 409, a brake pedal sensor 410, a gear sensor 411, an electronic parking system 412, and a brake antilock system 413, whether the vehicle is in a high-pressure energy recovery state is determined by at least one of the accelerator pedal sensor 409, the brake pedal sensor 410, the gear sensor 411, the electronic parking system 412, and the brake antilock system 413, for example: when the gear sensor 411 detects that the vehicle is in the range including: the traveling range including D, S, and E, and when the brake pedal sensor 410 detects that the brake pedal is depressed, it is determined that the vehicle is in a high-pressure energy recovery state.
The control system may further include: the vehicle body controller 407 is configured to monitor battery state information, and send the battery state information to the battery sensor 414 and the vehicle body controller 415 via the vehicle body controller 415 or a hard wire.
There is also provided in a further preferred embodiment of the present invention a vehicle including: a control system for low pressure energy recovery as described above.
In a further preferred embodiment of the present invention, a vehicle including the control system for low-voltage energy recovery is provided, so that the vehicle can selectively perform only high-voltage energy recovery or perform both high-voltage energy recovery and low-voltage energy recovery according to the energy recovery capability and the energy receiving capability of the power battery when performing energy recovery, thereby fully utilizing recovered energy, improving energy utilization, and reducing or even avoiding energy waste.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprise," "include," or any other variation thereof, are intended to cover a non-exclusive inclusion.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (9)
1. A control method for low-pressure energy recovery, characterized by comprising:
acquiring vehicle state information of a vehicle in running, and judging whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
when the vehicle is in a high-voltage energy recovery state according to the vehicle state information, acquiring the maximum allowable charging current of a power battery and the whole vehicle energy feedback current output by a motor;
comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
when the comparison result shows that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, sending a low-voltage energy recovery starting signal to a motor controller, wherein the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and a direct current-direct current converter;
after the step of sending the low voltage energy recovery start signal to the motor controller, the control method further includes:
acquiring current required by a whole vehicle load, allowable charging current of a storage battery and low-voltage energy recovery current output by the motor to the direct-current-direct-current converter;
determining the required current output by the power battery to the direct current-direct current converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the low-voltage energy recovery current;
and generating a control signal according to the required current and sending the control signal to a battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output by the power battery to the DC-DC converter according to the required current.
2. The control method according to claim 1, characterized in that after the step of sending a low-voltage energy recovery start signal to a motor controller, the control method further comprises:
and acquiring storage battery state information detected by a storage battery sensor, and sending the storage battery state information and a first low-voltage energy recovery display signal to a combination instrument, wherein the first low-voltage energy recovery display signal is used for controlling the combination instrument to display low-voltage energy recovery starting and the storage battery state information.
3. The control method according to claim 2, characterized by further comprising:
and when the maximum allowable charging current is detected to be equal to or greater than the whole vehicle energy feedback current, sending a low-voltage energy recovery cut-off signal to the motor controller, wherein the low-voltage energy recovery cut-off signal is used for controlling the motor controller to disconnect a circuit between the motor and the direct current-direct current converter.
4. A control method according to claim 3, characterized in that after the step of sending a low-voltage energy recovery cutoff signal to the motor controller, the control method further comprises:
and sending a second low-voltage energy recovery display signal to the combination instrument, wherein the second low-voltage energy recovery display signal is used for controlling the combination instrument to display low-voltage energy recovery to be closed.
5. An overall vehicle controller, comprising:
the first processing module is used for acquiring vehicle state information of a vehicle in running and judging whether the vehicle is in a high-voltage energy recovery state according to the vehicle state information;
the second processing module is used for acquiring the maximum allowable charging current of the power battery and the whole vehicle energy feedback current output by the motor when the vehicle is in the high-voltage energy recovery state according to the vehicle state information;
the third processing module is used for comparing the maximum allowable charging current with the whole vehicle energy feedback current to obtain a comparison result;
the fourth processing module is used for sending a low-voltage energy recovery starting signal to the motor controller when the comparison result shows that the maximum allowable charging current is smaller than the whole vehicle energy feedback current, and the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and the direct current-direct current converter;
further comprises:
the acquisition module is used for acquiring current required by the load of the whole vehicle, allowable charging current of the storage battery and low-voltage energy recovery current output by the motor to the direct-current-direct-current converter;
the fifth processing module is used for determining the required current of the power battery output to the direct current-direct current converter according to the current required by the whole vehicle load, the allowable charging current of the storage battery and the low-voltage energy recovery current;
and the sixth processing module is used for generating a control signal according to the required current and sending the control signal to the battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output by the power battery to the DC-DC converter according to the required current.
6. A control system for low pressure energy recovery, comprising:
a battery management system, a motor controller, a dc-dc converter, a motor, a power battery, a storage battery, and a vehicle controller according to claim 5;
the whole vehicle controller is respectively in communication connection with the battery management system and the motor controller;
the battery management system is also connected with the power battery;
the motor controller is also connected with the motor;
the direct current-direct current converter is respectively connected with the motor, the power battery, the storage battery and the whole vehicle load.
7. The control system of claim 6, further comprising: a combination meter;
and the combination instrument is in communication connection with the whole vehicle controller.
8. The control system of claim 6, further comprising: and at least one of an accelerator pedal sensor, a brake pedal sensor, a gear sensor, an electronic parking system, a brake anti-lock system, a storage battery sensor and a vehicle body controller which are connected with the whole vehicle controller.
9. A vehicle, characterized by comprising: a low pressure energy recovery control system as claimed in any one of claims 6 to 8.
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