CN112428885A - Hybrid power control method and device based on current limit value - Google Patents

Hybrid power control method and device based on current limit value Download PDF

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Publication number
CN112428885A
CN112428885A CN202011302246.6A CN202011302246A CN112428885A CN 112428885 A CN112428885 A CN 112428885A CN 202011302246 A CN202011302246 A CN 202011302246A CN 112428885 A CN112428885 A CN 112428885A
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current
motor
output voltage
vehicle
total current
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CN112428885B (en
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徐亚美
胡刚毅
苗强
李强
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • 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
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a hybrid power control method and a hybrid power control device based on current limit values, wherein the hybrid power control method comprises the following steps: according to the requirement of the whole vehicle, the required total current is estimated; acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage; in response to the received demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the motor rotating speed to obtain the bus current of the motor; the required total current is estimated again through the bus current of the motor to obtain a target required total current; and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command. The invention carries out estimation by taking current as a target, provides an estimation method and a power mode control scheme, and avoids shutdown caused by overcurrent.

Description

Hybrid power control method and device based on current limit value
Technical Field
The invention relates to the technical field of automobiles, in particular to a hybrid power control method and device based on a current limit value.
Background
The hybrid electric vehicle has the advantages of both an internal combustion engine and a pure electric vehicle, has the advantages of low oil consumption, low emission, long driving range and the like, and is a vehicle model which is paid more attention to by users at present. The fuel cell engine is used as a power supply of the vehicle, the capability of the fuel cell engine for outputting current under a certain output voltage value is limited, the fuel cell engine is easily caused to be directly stopped when the required current of the whole vehicle is overlarge, and the phenomenon of power source interruption influences the driving safety. Therefore, how to adjust the demand control of the whole parts and the power mode of the whole vehicle according to the current limit value is a main problem of ensuring the driving safety.
Disclosure of Invention
In order to solve the problems, the invention provides a hybrid power control method and device based on a current limit value, and the problem of shutdown caused by vehicle overcurrent is solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a hybrid control method based on current limits, comprising:
according to the requirement of the whole vehicle, the required total current is estimated;
acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage;
in response to receiving a demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current;
the required total current is estimated again through the bus current of the motor to obtain a target required total current;
and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command.
Optionally, the querying a preset three-dimensional table through the corrected output voltage and the motor speed to obtain a bus current of the motor includes:
acquiring the current rotating speed and the required torque of the vehicle;
determining a motor state of the vehicle based on a current rotational speed and a required torque of the vehicle;
if the motor is in a driving state, inquiring a bus ammeter in the driving state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor;
and if the motor is in the feed state, inquiring a bus ammeter in the feed state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor.
Optionally, the generating a control command based on the target required total current includes:
if the target required total current is larger than the current limit value of the fuel cell, judging whether the power cell can be started;
if yes, controlling the vehicle to enter a hybrid power mode;
if not, controlling the vehicle to enter a fuel cell engine working mode;
and if the target total required current is not greater than the current limit value of the fuel cell, controlling the vehicle to enter a working mode of the fuel cell engine.
Optionally, the correcting the output voltage by using the required total current to obtain a corrected output voltage includes:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
Optionally, the estimating of the total current required according to the vehicle demand includes:
acquiring current of a high-voltage electrical system of the whole vehicle;
the sum of the currents of the individual high-voltage electrical systems is calculated and determined as the required total current.
A hybrid control device based on current limits, comprising:
the estimating unit is used for estimating and obtaining the required total current according to the requirement of the whole vehicle;
the correction unit is used for acquiring the output voltage of the fuel cell and correcting the output voltage by using the required total current to obtain the corrected output voltage;
the query unit is used for responding to a received demand torque instruction, querying a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current;
the re-estimation unit is used for re-estimating the required total current through the bus current of the motor to obtain the target required total current;
and the generating unit is used for generating a control command based on the target total current demand so that the vehicle enters a corresponding working mode based on the control command.
Optionally, the query unit includes:
the first acquiring subunit is used for acquiring the current rotating speed and the required torque of the vehicle;
a first determination subunit configured to determine a motor state of the vehicle based on a current rotation speed and a required torque of the vehicle;
the first inquiry subunit is used for inquiring the bus ammeter in the driving state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the driving state;
and the second inquiry subunit is used for inquiring the bus ammeter in the feed state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the feed state.
Optionally, the generating unit includes:
the judging subunit is used for judging whether the power battery can be started or not if the target required total current is greater than the current limit value of the fuel battery;
a first control subunit for, if so, controlling the vehicle to enter a hybrid mode;
the second control subunit is used for controlling the vehicle to enter the working mode of the fuel cell engine if the vehicle does not enter the working mode;
and the second control subunit is further used for controlling the vehicle to enter the fuel cell engine working mode if the target required total current is not larger than the fuel cell current limit value.
Optionally, the correction unit is specifically configured to:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
Optionally, the pre-estimating unit includes:
the second acquisition subunit is used for acquiring the current of a high-voltage electrical system of the whole vehicle;
a second determining subunit for calculating a sum of the currents of the respective high-voltage electrical systems, the sum being determined as a required total current.
Compared with the prior art, the invention provides a hybrid power control method and device based on current limit, which comprises the following steps: according to the requirement of the whole vehicle, the required total current is estimated; acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage; in response to the received demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the motor rotating speed to obtain the bus current of the motor; the required total current is estimated again through the bus current of the motor to obtain a target required total current; and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command. The invention carries out estimation by taking current as a target, provides an estimation method and a power mode control scheme, and avoids shutdown caused by overcurrent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a hybrid power control method based on current limits according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high voltage electrical connection provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a low voltage apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an operation principle of determining a bus current based on a rotation speed and a torque according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a hybrid control device based on a current limit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
In an embodiment of the present invention, a hybrid control method based on current limit is provided, and referring to fig. 1, the method may include:
and S101, estimating to obtain the required total current according to the vehicle requirement.
In the embodiment of the invention, the control of each part can be carried out according to the current limit value. Referring to fig. 2, a schematic diagram of a high-voltage electrical connection provided by an embodiment of the invention is shown. The fuel cell engine and the power battery are respectively connected to the power distribution unit through switches K1 and K2, the driving motor system, the electric air conditioner, the electric power steering system and the electric air compressor system are respectively connected with the power distribution unit through switches K3-K6, only part of power consumption parts of the whole vehicle are listed in the schematic diagram of FIG. 2, and other parts such as electric defrosting and the like are also connected with a power supply through separate switches, but are not listed one by one. Referring to fig. 3, a schematic diagram of a connection of a low voltage apparatus according to an embodiment of the present invention is shown. Each part of the vehicle and the whole vehicle control unit CAN interact signals through a CAN, for example: control commands, state feedback, and the like; and the whole vehicle control unit controls the on/off of each switch K1-K7 according to real-time calculation.
Firstly, estimating the total current of the vehicle, namely estimating the total current I of the vehicle according to the vehicle requirementGeneral assembly。
IGeneral assembly＝IAsign(k3)+IBsign(k4)+ICsign(k5)+IDsign(k6)
Wherein the content of the first and second substances,
Figure BDA0002787251470000051
IA-current to drive the motor system, the present solution providing a method of determining the motor system current, a positive current representing the motor in a driving state and a negative current representing the motor in a feeding state;
IB-electric air conditioning power consumption current, taking rated current;
ICthe electric power steering system takes peak current, the current increases along with the increase of a steering load, and the safety redundancy can be improved by taking the peak current without detection means such as a steering sensor and the like;
IDan electric air compressor system, taking rated current.
And S102, acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage.
The fuel cell engine is used as a power supply, the output voltage of the fuel cell engine is the bus voltage of the motor system, and the output peak current and the output peak voltage of the fuel cell engine are corresponding, namely an external characteristic curve, so that the output voltage is checked according to the external characteristic curve by the required total output current of the fuel cell.
And S103, responding to the received demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the motor rotating speed, and obtaining the bus current of the motor.
The three-dimensional table is a three-dimensional data mapping table of output voltage, motor rotating speed and bus current of the motor. In the prior art, a formula is adopted to calculate and correct bus current, such as I ═ T × n/(9550U), I-bus current, T-output torque, n-rotation speed and U-voltage, efficiency between input and output is not considered, and efficiency is different under different voltages, torques and rotation speeds, and cannot be expressed by a formula. The embodiment of the invention adopts a table look-up mode to obtain the required bus current, and the table look-up mode is more accurate because the table data is calibrated and actually measured on the rack, and factors such as efficiency and the like are reflected in the actually measured data.
Referring to fig. 4, the working principle of determining the bus current based on the rotational speed and the torque provided by the embodiment of the invention is shown, and a corresponding three-dimensional table is obtained by measuring experimental values of the rotational speed, the torque and the bus current on the basis of the working principle and calibrating on a rack. And respectively looking up different three-dimensional tables for the driving current and the feeding current to obtain corresponding bus currents. Specifically, the current rotating speed and the required torque of the vehicle are obtained; determining a motor state of the vehicle based on a current rotational speed and a required torque of the vehicle; if the motor is in a driving state, inquiring a bus ammeter in the driving state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the required bus current; and if the motor is in a feeding state, inquiring a bus ammeter in the feeding state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the required bus current.
And S104, re-estimating the required total current through the bus current of the motor to obtain the target required total current.
And S105, generating a control command based on the target required total current, so that the vehicle enters a corresponding working mode based on the control command.
Because the output voltage is corrected, the bus current of the motor is obtained based on the corrected voltage lookup table, and then the initially estimated required total current is estimated again according to the bus current of the motor and the currents of other systems, such as the current of an electric air conditioner, the motor steering required current and the like, so that the target required total current is obtained.
The control instruction generated in the embodiment of the invention is used for indicating which power mode the vehicle enters, and the whole vehicle control unit can also control the on/off of the switch of the corresponding component according to the bus current calculated in real time so as to ensure that the required current of the whole vehicle does not exceed the current limit value and stop or a power output terminal cannot be caused.
And judging which power mode is used according to the estimated total current required under the driving state by combining the states of the fuel cell engine and the power cell, wherein the power cell needs to be communicated if a feed state exists. In a possible embodiment of the present invention, the generating a control command based on the target required total current includes:
if the target required total current is larger than the current limit value of the fuel cell, judging whether the power cell can be started; if yes, controlling the vehicle to enter a hybrid power mode; if not, controlling the vehicle to enter a fuel cell engine working mode; and if the target total required current is not greater than the current limit value of the fuel cell, controlling the vehicle to enter a working mode of the fuel cell engine.
The invention provides a hybrid power control method based on a current limit value, which comprises the following steps: according to the requirement of the whole vehicle, the required total current is estimated; acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage; in response to the received demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the motor rotating speed to obtain the bus current of the motor; the required total current is estimated again through the bus current of the motor to obtain a target required total current; and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command. The invention carries out estimation by taking current as a target, provides an estimation method and a power mode control scheme, and avoids shutdown caused by overcurrent.
Referring to fig. 5, in an embodiment of the present invention, there is also provided a hybrid control device based on a current limit, including:
the estimating unit 10 is used for estimating and obtaining the required total current according to the vehicle requirement;
a correction unit 20, configured to obtain an output voltage of the fuel cell, and correct the output voltage by using the required total current to obtain a corrected output voltage;
the query unit 30 is configured to query a preset three-dimensional table through the corrected output voltage and the motor speed in response to receiving a demand torque instruction, so as to obtain a bus current of the motor, where the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor speed, and the bus current;
the re-estimation unit 40 is used for re-estimating the required total current through the bus current of the motor to obtain a target required total current;
and the generating unit 50 is used for generating a control instruction based on the target total current demand so that the vehicle enters a corresponding working mode based on the control instruction.
On the basis of the above embodiment, the query unit includes:
the first acquiring subunit is used for acquiring the current rotating speed and the required torque of the vehicle;
a first determination subunit configured to determine a motor state of the vehicle based on a current rotation speed and a required torque of the vehicle;
the first inquiry subunit is used for inquiring the bus ammeter in the driving state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the driving state;
and the second inquiry subunit is used for inquiring the bus ammeter in the feed state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the feed state.
On the basis of the above embodiment, the generating unit includes:
the judging subunit is used for judging whether the power battery can be started or not if the target required total current is greater than the current limit value of the fuel battery;
a first control subunit for, if so, controlling the vehicle to enter a hybrid mode;
the second control subunit is used for controlling the vehicle to enter the working mode of the fuel cell engine if the vehicle does not enter the working mode;
and the second control subunit is further used for controlling the vehicle to enter the fuel cell engine working mode if the target required total current is not larger than the fuel cell current limit value.
On the basis of the above embodiment, the correction unit is specifically configured to:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
On the basis of the above embodiment, the estimating unit includes:
the second acquisition subunit is used for acquiring the current of a high-voltage electrical system of the whole vehicle;
a second determining subunit for calculating a sum of the currents of the respective high-voltage electrical systems, the sum being determined as a required total current.
Compared with the prior art, the invention provides a hybrid power control method and device based on current limit, and the pre-estimation unit pre-estimates the total current required according to the requirement of the whole vehicle; the correction unit acquires the output voltage of the fuel cell and corrects the output voltage by using the required total current to obtain the corrected output voltage; the query unit is used for responding to a received demand torque instruction, querying a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current; the re-estimation unit re-estimates the required total current through the bus current of the motor to obtain a target required total current; the generation unit generates a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command. The invention carries out estimation by taking current as a target, provides an estimation method and a power mode control scheme, and avoids shutdown caused by overcurrent.
In an embodiment of the present invention, a storage medium is further provided, and the storage medium stores computer program codes, and the computer program codes execute any one of the hybrid power control method based on the current limit value.
On the other hand, in an embodiment of the present invention, there is also provided an electronic device, including:
a memory for storing a program;
a processor configured to execute the program, the program specifically configured to:
according to the requirement of the whole vehicle, the required total current is estimated;
acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage;
in response to receiving a demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current;
the required total current is estimated again through the bus current of the motor to obtain a target required total current;
and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command.
Optionally, the querying a preset three-dimensional table through the corrected output voltage and the motor speed to obtain a bus current of the motor includes:
acquiring the current rotating speed and the required torque of the vehicle;
determining a motor state of the vehicle based on a current rotational speed and a required torque of the vehicle;
if the motor is in a driving state, inquiring a bus ammeter in the driving state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor;
and if the motor is in the feed state, inquiring a bus ammeter in the feed state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor.
Optionally, the generating a control command based on the target required total current includes:
if the target required total current is larger than the current limit value of the fuel cell, judging whether the power cell can be started;
if yes, controlling the vehicle to enter a hybrid power mode;
if not, controlling the vehicle to enter a fuel cell engine working mode;
and if the target total required current is not greater than the current limit value of the fuel cell, controlling the vehicle to enter a working mode of the fuel cell engine.
Optionally, the correcting the output voltage by using the required total current to obtain a corrected output voltage includes:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
Optionally, the estimating of the total current required according to the vehicle demand includes:
acquiring current of a high-voltage electrical system of the whole vehicle;
the sum of the currents of the individual high-voltage electrical systems is calculated and determined as the required total current.
Based on the foregoing embodiments, embodiments of the invention provide a computer-readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the steps of a current limit based hybrid control method as any one of the above.
The processor or the CPU may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is to be understood that the electronic device implementing the above-described processor function may be other electronic devices, and the embodiments of the present invention are not particularly limited.
The computer storage medium/Memory may be a Memory such as a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic random access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disc, or a compact disc Read-Only Memory (CD-ROM); but may also be various terminals such as mobile phones, computers, tablet devices, personal digital assistants, etc., that include one or any combination of the above-mentioned memories.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as a removable Memory device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
The methods disclosed in the several method embodiments provided by the present invention can be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided by the invention may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided by the present invention may be combined arbitrarily, without conflict, to arrive at new method embodiments or apparatus embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for hybrid control based on current limits, comprising:
according to the requirement of the whole vehicle, the required total current is estimated;
acquiring the output voltage of the fuel cell, and correcting the output voltage by using the required total current to obtain the corrected output voltage;
in response to receiving a demand torque instruction, inquiring a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current;
the required total current is estimated again through the bus current of the motor to obtain a target required total current;
and generating a control command based on the target total current demand, so that the vehicle enters a corresponding working mode based on the control command.
2. The method according to claim 1, wherein the obtaining of the bus current of the motor by querying a preset three-dimensional table through the corrected output voltage and the motor speed comprises:
acquiring the current rotating speed and the required torque of the vehicle;
determining a motor state of the vehicle based on a current rotational speed and a required torque of the vehicle;
if the motor is in a driving state, inquiring a bus ammeter in the driving state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor;
and if the motor is in the feed state, inquiring a bus ammeter in the feed state according to the rotating speed, the torque and the corrected output voltage of the motor to obtain the bus current of the motor.
3. The method of claim 1, wherein generating control commands based on the target required total current comprises:
if the target required total current is larger than the current limit value of the fuel cell, judging whether the power cell can be started;
if yes, controlling the vehicle to enter a hybrid power mode;
if not, controlling the vehicle to enter a fuel cell engine working mode;
and if the target total required current is not greater than the current limit value of the fuel cell, controlling the vehicle to enter a working mode of the fuel cell engine.
4. The method of claim 1, wherein said correcting said output voltage with said demanded total current to obtain a corrected output voltage comprises:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
5. The method of claim 1, wherein estimating the total current demand according to vehicle demand comprises:
acquiring current of a high-voltage electrical system of the whole vehicle;
the sum of the currents of the individual high-voltage electrical systems is calculated and determined as the required total current.
6. A hybrid control device based on a current limit, comprising:
the estimating unit is used for estimating and obtaining the required total current according to the requirement of the whole vehicle;
the correction unit is used for acquiring the output voltage of the fuel cell and correcting the output voltage by using the required total current to obtain the corrected output voltage;
the query unit is used for responding to a received demand torque instruction, querying a preset three-dimensional table through the corrected output voltage and the corrected motor rotating speed to obtain the bus current of the motor, wherein the three-dimensional table is a three-dimensional data mapping table of the output voltage, the motor rotating speed and the bus current;
the re-estimation unit is used for re-estimating the required total current through the bus current of the motor to obtain the target required total current;
and the generating unit is used for generating a control command based on the target total current demand so that the vehicle enters a corresponding working mode based on the control command.
7. The apparatus of claim 6, wherein the query unit comprises:
the first acquiring subunit is used for acquiring the current rotating speed and the required torque of the vehicle;
a first determination subunit configured to determine a motor state of the vehicle based on a current rotation speed and a required torque of the vehicle;
the first inquiry subunit is used for inquiring the bus ammeter in the driving state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the driving state;
and the second inquiry subunit is used for inquiring the bus ammeter in the feed state according to the rotating speed and the torque of the motor and the corrected output voltage to obtain the bus current of the motor if the motor is in the feed state.
8. The apparatus of claim 6, wherein the generating unit comprises:
the judging subunit is used for judging whether the power battery can be started or not if the target required total current is greater than the current limit value of the fuel battery;
a first control subunit for, if so, controlling the vehicle to enter a hybrid mode;
the second control subunit is used for controlling the vehicle to enter the working mode of the fuel cell engine if the vehicle does not enter the working mode;
and the second control subunit is further used for controlling the vehicle to enter the fuel cell engine working mode if the target required total current is not larger than the fuel cell current limit value.
9. The apparatus according to claim 6, wherein the correction unit is specifically configured to:
and correcting the output voltage according to the external characteristic curve and the required total current to obtain the corrected output voltage.
10. The apparatus of claim 6, wherein the pre-estimating unit comprises:
the second acquisition subunit is used for acquiring the current of a high-voltage electrical system of the whole vehicle;
a second determining subunit for calculating a sum of the currents of the respective high-voltage electrical systems, the sum being determined as a required total current.
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