CN113525097A - Low-voltage energy recovery control method, vehicle control unit, system and vehicle - Google Patents
Low-voltage energy recovery control method, vehicle control unit, system and vehicle Download PDFInfo
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- CN113525097A CN113525097A CN202010315333.9A CN202010315333A CN113525097A CN 113525097 A CN113525097 A CN 113525097A CN 202010315333 A CN202010315333 A CN 202010315333A CN 113525097 A CN113525097 A CN 113525097A
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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
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention provides a control method for low-voltage energy recovery, a vehicle controller, a system and a vehicle, wherein the control method comprises the following steps: when the vehicle is judged to be 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; and when the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, sending a low-voltage energy recovery starting signal to the motor controller, and controlling the motor controller 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, when the maximum allowable charging current of the power battery is smaller than the whole vehicle energy feedback current output by the motor, low-voltage energy recovery is started, and 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, a whole vehicle controller, a system and a vehicle for low-voltage energy recovery.
Background
With the development of vehicle technology, the application of energy recovery technology in vehicles, especially electric vehicles, is more and more extensive. When the electric automobile slides or brakes in a running gear, such as a D gear, an S gear or an E gear, a part of mechanical energy is converted into electric energy through the motor, the electric energy is stored in the power battery and is supplied to electric equipment of the whole automobile, and the conversion and recovery of braking energy are realized.
However, the energy recovery of the whole vehicle is limited to high-voltage energy recovery at present, 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. Therefore, how to avoid or reduce the energy waste becomes one of the problems to be solved by the technicians.
Disclosure of Invention
The technical purpose to be achieved by the embodiment of the invention is to provide a control method, a vehicle control unit, a system and a vehicle for low-voltage energy recovery, which are used for solving the problems that the energy recovery of the current vehicle is only limited to high-voltage energy recovery, and energy is wasted when the recovery current is large.
In order to solve the above technical problem, 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 or not according to the vehicle state information;
when the vehicle is determined to be 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;
and when the comparison result shows that the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, sending a low-voltage energy recovery starting signal to the 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 the direct current-direct current converter.
Preferably, 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:
acquiring current required by the load of the whole vehicle, allowable charging current of a storage battery and low-voltage energy recovery current output to a direct current-direct current converter by a motor;
determining the required current output to the DC-DC converter by the power battery according to the current required by the load of the whole vehicle, 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 the battery management system, wherein the control signal is used for controlling the battery management system to adjust the current output from the power battery to the DC-DC converter according to the required current.
Further, the control method as described above, after the step of sending the low voltage energy recovery start signal to the motor controller, further includes:
the method comprises the steps of obtaining 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 meter, wherein the first low-voltage energy recovery display signal is used for controlling the combination meter to display low-voltage energy recovery starting and storage battery state information.
Specifically, the control method described above further includes:
and when the maximum allowable charging current is detected to be equal to or larger than the energy feedback current of the whole vehicle, 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 cut off a circuit between the motor and the direct current-direct current converter.
Preferably, the control method as described above, after the step of sending the low voltage energy recovery cut-off signal to the motor controller, the control method further includes:
and sending a second low-voltage energy recovery display signal to the combination meter, wherein the second low-voltage energy recovery display signal is used for controlling the combination meter to display that the low-voltage energy recovery is closed.
Another preferred embodiment of the present invention also provides a vehicle control unit, including:
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 or not 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 determined to be 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 energy feedback current of the whole vehicle, wherein 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 control unit 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 to the direct current-direct current converter by the motor;
the fifth processing module is used for determining the required current output to the direct current-direct current converter by the power battery according to the current required by the load of the whole vehicle, 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 demand current and sending the control signal to the battery management system, and 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 demand current.
Specifically, the vehicle control unit as described above further includes:
and the seventh processing module is used for acquiring the state information of the storage battery detected by the storage battery sensor and sending the state information of the storage battery and the 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 state information of the storage battery.
Preferably, the vehicle control unit 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 energy feedback current of the whole vehicle, 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 control unit 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 meter, wherein the second low-voltage energy recovery display signal is used for controlling the combination meter to display that the low-voltage energy recovery is closed.
Still another preferred embodiment of the present invention also provides a low pressure energy recovery control system, 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 the vehicle control unit;
the vehicle control unit is in communication connection with the battery management system and the motor controller respectively;
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 load of the whole vehicle.
Specifically, the control system as described above, further includes: a combination meter;
and the combination instrument is in communication connection with the vehicle control unit.
Preferably, the control system as described above, further comprising: and at least one of an accelerator pedal sensor, a brake pedal sensor, a gear sensor, an electronic parking system, an anti-lock braking system, a storage battery sensor and a vehicle body controller which are connected with the vehicle control unit.
Still another preferred embodiment of the present invention provides a vehicle including: the control system for low pressure energy recovery as described above.
Compared with the prior art, the control method, the vehicle control unit, the system and the vehicle for low-voltage energy recovery provided by the embodiment of the invention at least have the following beneficial effects:
the technical scheme of the invention obtains the maximum allowable charging current of a power battery and the whole vehicle energy feedback current output by a motor and compares the maximum allowable charging current and the whole vehicle energy feedback current when the vehicle is in a high-voltage energy recovery state, when the maximum allowable charging current is determined to be smaller than the whole vehicle energy feedback current, namely the energy recovery capability of the vehicle is determined to exceed the energy receiving capability of the power battery, a low-voltage energy recovery starting signal is sent to a motor controller, the motor controller is enabled to be communicated with a circuit between the motor and a direct current-direct current converter for low-voltage energy recovery, the redundant recovered energy is directly transmitted to the direct current-direct current converter, the direct current-direct current converter is used for converting and then supplying power to a whole vehicle load and a storage battery, the storage battery stores the received energy, the recovered energy is fully utilized, and the utilization rate of the recovered energy is improved, waste of recovered energy is reduced or even avoided.
Drawings
FIG. 1 is a schematic flow diagram of a low pressure energy recovery control method according to the present invention;
FIG. 2 is a second flowchart of the method for controlling low-pressure energy recovery according to the present invention;
FIG. 3 is a schematic structural diagram of the vehicle control unit of the present invention;
fig. 4 is a schematic structural diagram of a low-pressure energy recovery control system of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may 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 execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Referring to fig. 1, a preferred embodiment of the present invention provides a low-pressure energy recovery control method, including:
step S101, acquiring vehicle state information of a vehicle in running, and judging whether the vehicle is in a high-voltage energy recovery state or not according to the vehicle state information;
step S102, when the vehicle is determined to be 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;
and step S104, when the comparison result shows that the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, sending a low-voltage energy recovery starting signal to the 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 the direct current-direct current converter.
In a preferred embodiment of the present invention, when the vehicle is in a driving state, the vehicle performs energy recovery while sliding or braking, and at this time, whether the vehicle is in a high-voltage energy recovery state can be determined according to the obtained vehicle state information, and when it is determined that the vehicle is in the high-voltage energy recovery state, in order to determine whether the energy recovery capability of the current vehicle exceeds the energy receiving capability of the power battery, the maximum allowable charging current of the power battery is obtained to represent the energy receiving capability of the power battery, the vehicle energy feedback current generated by the vehicle performing energy recovery represents the energy recovery capability of the vehicle, and the maximum allowable charging current is compared with the vehicle energy feedback current, that is, whether the energy recovery capability of the vehicle exceeds the energy receiving capability of the power battery can be determined according to the comparison result; when the comparison result shows that the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, the energy recovery capacity of the vehicle can be determined to exceed the energy receiving capacity of the power battery, and partial energy waste can be caused only by high-voltage energy recovery at the moment, so that a low-voltage energy recovery starting signal is sent to the motor controller, the motor controller is 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 supplies power to the load of the whole vehicle and the storage battery after conversion, 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 sending the low voltage energy recovery start signal to the motor controller, further includes:
step S201, acquiring current required by a load of the whole vehicle, allowable charging current of a storage battery and low-voltage energy recovery current output to a direct current-direct current converter by a motor;
step S202, determining the required current output to the DC-DC converter by the power battery according to the current required by the load of the whole vehicle, the allowable charging current of the storage battery and the low-voltage energy recovery current;
and step S203, 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 from the power battery to the DC-DC converter according to the required current.
In a preferred embodiment of the present invention, after sending the low voltage energy recovery start signal to the motor controller and starting low voltage energy recovery, the current required by the load of the entire vehicle, the allowable charging current of the storage battery and the low voltage recovery current are obtained, wherein the current required by the load of the entire vehicle and the allowable charging current of the storage battery constitute the total output current of the dc-dc converter, the low voltage energy recovery current and the current required by the power battery to output to the dc-dc converter constitute the total input current of the dc-dc converter, so that the current required by the power battery to output to the dc-dc converter can be determined according to the relationship that the total output current is equal to the total input current, and then a control signal is generated according to the current required and sent to the battery management system to adjust the current output by the power battery to the dc-dc converter, the energy output of the power battery is reduced on the basis of fully utilizing the recovered energy, and the energy utilization rate is improved.
Further, the control method as described above, after the step of sending the low voltage energy recovery start signal to the motor controller, further includes:
the method comprises the steps of obtaining 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 meter, wherein the first low-voltage energy recovery display signal is used for controlling the combination meter to display low-voltage energy recovery starting and storage battery state information.
In a specific embodiment of the invention, after the low-voltage energy recovery is started, the state information of the storage battery detected by the storage battery sensor is acquired, and the state information of the storage battery 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 state information of the storage battery of the current vehicle, a driver can conveniently and visually know the current vehicle state, and the driver can conveniently reduce the energy recovery capacity by reducing the braking force and the like under the condition of ensuring the safety, and the energy utilization rate is further improved. Specifically, the battery state information includes, but is not limited to: voltage, current, remaining charge, battery health, etc.
Specifically, the control method described above further includes:
and when the maximum allowable charging current is detected to be equal to or larger than the energy feedback current of the whole vehicle, 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 cut off a circuit between the motor and the direct current-direct current converter.
In an embodiment of the present invention, after starting the low-voltage energy recovery, when detecting that the maximum allowable charging current of the power battery is equal to or greater than the vehicle energy feedback current, it may be determined that the energy receiving capability of the current power battery is equal to or greater than the vehicle energy recovery capability, and the energy obtained by the vehicle through energy recovery may be completely received only by the power battery, and at this time, a low-voltage capability 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, which is beneficial to ensuring and improving the driving range of the vehicle.
Preferably, the control method as described above, after the step of sending the low voltage energy recovery cut-off signal to the motor controller, the control method further includes:
and sending a second low-voltage energy recovery display signal to the combination meter, wherein the second low-voltage energy recovery display signal is used for controlling the combination meter to display that the low-voltage energy recovery is closed.
In another preferred embodiment of the present invention, after the low voltage energy recovery cut-off signal is sent to the motor controller to control 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 information of the low voltage energy recovery cut-off is displayed by the combination meter, 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 also provides a vehicle control unit, 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, when it is determined that the vehicle is in the high-voltage energy recovery state according to the vehicle state information, obtain a maximum allowable charging current of the power battery and a vehicle energy feedback current output by the motor;
the third processing module 303 is configured to compare the maximum allowable charging current with the entire vehicle energy feedback current to obtain a comparison result;
and a fourth processing module 304, 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 energy feedback current of the entire vehicle, 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 control unit 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 to the direct current-direct current converter by the motor;
the fifth processing module is used for determining the required current output to the direct current-direct current converter by the power battery according to the current required by the load of the whole vehicle, 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 demand current and sending the control signal to the battery management system, and 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 demand current.
Specifically, the vehicle control unit as described above further includes:
and the seventh processing module is used for acquiring the state information of the storage battery detected by the storage battery sensor and sending the state information of the storage battery and the 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 state information of the storage battery.
Preferably, the vehicle control unit 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 energy feedback current of the whole vehicle, 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 control unit 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 meter, wherein the second low-voltage energy recovery display signal is used for controlling the combination meter to display that the low-voltage energy recovery is closed.
The embodiment of the vehicle control unit is the vehicle control unit corresponding to the embodiment of the control method, and all implementation means in the embodiment of the control method are suitable for the embodiment of the vehicle control unit, so that the same technical effect can be achieved.
Referring to fig. 4, still another preferred embodiment of the present invention also provides a low pressure energy recovery control system, including:
a battery management system 401, a motor controller 402, a dc-dc converter 403, a motor 404, a power battery 405, a storage battery 406, and a vehicle control unit 407 as described above;
the vehicle control unit 407 is in communication connection with the battery management system 401 and the motor controller 402 respectively;
the battery management system 401 is also connected with 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.
In an embodiment of the present invention, a control system for low-voltage energy recovery is provided, including the vehicle controller 407 described above, 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 a vehicle is in a high-voltage energy recovery state, the battery management system 401 obtains a maximum allowable charging current of the power battery 405 connected to the battery management system 401, and the motor controller 402 obtains a vehicle energy feedback current output by the motor 404 connected to 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 shows that the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, it can be determined that the energy recovery capability of the vehicle exceeds the energy receiving capability of the power battery 405, and at this time, only high-voltage energy recovery will cause partial energy waste, so that a low-voltage energy recovery starting signal is sent to the motor controller 402, the motor controller 402 is enabled to be connected with a circuit between the motor 404 and the dc-dc converter 403 to perform low-voltage energy recovery, the redundant recovered energy is directly transmitted to the dc-dc converter 403, the power is supplied to the load 418 of the whole vehicle and the storage battery 406 after being converted by the dc-dc converter 403, 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 waste of the recovered energy is reduced or even avoided.
The dc-dc converter 403 is respectively connected to the motor 404, the power battery 405, the battery 406, and the vehicle control unit 407, so that the vehicle control unit 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 rate.
Referring to fig. 4, in particular, the control system as described above, further includes: a cluster gauge 408;
the combination meter 408 is in communication connection with the vehicle control unit 407.
In an embodiment of the present invention, the control system further includes a combination meter 408, wherein the combination meter 408 is communicatively connected to the vehicle controller 407, so that the combination meter 408 can display specific content according to a display signal sent by the vehicle controller 407, for example: displaying low-voltage energy recovery start and acquired storage battery state information according to a first display signal for displaying low-voltage energy recovery start; and displaying the low-voltage energy recovery cutoff according to a second display signal for displaying the low-voltage energy recovery cutoff, and the like.
Referring to fig. 4, preferably, the control system as described above, further includes: and 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 anti-lock system 413, a battery sensor 414 and a vehicle body controller 415 which are connected with the vehicle control unit 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 an anti-lock brake system 413, and whether the vehicle is in a high-pressure energy recovery state is judged 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 anti-lock brake system 413, for example: when the shift position sensor 411 detects that the vehicle is in a position including: and a driving range including the D range, the S range and the E range, and when the brake pedal sensor 410 detects that the brake pedal is stepped on, it is determined that the vehicle is in the high pressure energy recovery state.
The control system may further include: a battery sensor 414 and a vehicle body controller 415, wherein the battery sensor 414 is used for monitoring battery status information and sending the battery status information to the vehicle controller 407 through the vehicle body controller 415 or a hard wire.
Still another preferred embodiment of the present invention provides a vehicle including: the control system for low pressure energy recovery as described above.
In still another preferred embodiment of the present invention, a vehicle including the above-mentioned low-voltage energy recovery control system is further provided, so that when the vehicle performs energy recovery, only high-voltage energy recovery or both high-voltage energy recovery and low-voltage energy recovery are selectively performed according to the energy recovery capability and the energy receiving capability of the power battery, so that the recovered energy is fully utilized, the energy utilization rate is improved, and energy waste is reduced or even avoided.
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, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of controlling low pressure energy recovery, comprising:
acquiring vehicle state information of a vehicle in running, and judging whether the vehicle is in a high-voltage energy recovery state or not according to the vehicle state information;
when the vehicle is determined to be 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;
and when the comparison result shows that the maximum allowable charging current is smaller than the energy feedback current of the whole vehicle, 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 be connected with a circuit between the motor and the DC-DC converter.
2. The control method of claim 1, wherein after the step of sending a low voltage energy recovery enable signal to a motor controller, the control method further comprises:
acquiring current required by the load of the whole vehicle, allowable charging current of a storage battery and low-voltage energy recovery current output to the direct current-direct current converter by the motor;
determining the required current output to the DC-DC converter by the power battery according to the current required by the load of the whole vehicle, 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.
3. The control method of claim 1, wherein after the step of sending a low voltage energy recovery enable signal to a motor controller, the control method further comprises:
the method comprises the steps of obtaining 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 meter, wherein the first low-voltage energy recovery display signal is used for controlling the combination meter to display low-voltage energy recovery starting and the storage battery state information.
4. The control method according to claim 3, characterized by further comprising:
and when the maximum allowable charging current is detected to be equal to or larger 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.
5. The control method of claim 4, wherein 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 meter, wherein the second low-voltage energy recovery display signal is used for controlling the combination meter to display that the low-voltage energy recovery is closed.
6. A vehicle control unit, 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 or not 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 determined to be in a 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 energy feedback current of the whole vehicle, wherein the low-voltage energy recovery starting signal is used for controlling the motor controller to switch on a circuit between the motor and the DC-DC converter.
7. A control system for low pressure energy recovery, comprising:
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 the vehicle control unit according to claim 6;
the vehicle control unit is in communication connection with the battery management system and the motor controller respectively;
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 load of the whole vehicle.
8. The control system of claim 7, further comprising: a combination meter;
and the combination meter is in communication connection with the vehicle control unit.
9. The control system of claim 7, further comprising: and at least one of an accelerator pedal sensor, a brake pedal sensor, a gear sensor, an electronic parking system, an anti-lock braking system, a storage battery sensor and a vehicle body controller which are connected with the vehicle control unit.
10. A vehicle, characterized by comprising: a control system for low pressure energy recovery as claimed in any one of claims 7 to 9.
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