CN104184191A - Whole vehicle control device and control method for electric vehicle - Google Patents
Whole vehicle control device and control method for electric vehicle Download PDFInfo
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- CN104184191A CN104184191A CN201410414046.8A CN201410414046A CN104184191A CN 104184191 A CN104184191 A CN 104184191A CN 201410414046 A CN201410414046 A CN 201410414046A CN 104184191 A CN104184191 A CN 104184191A
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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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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention provides a whole vehicle control device and control method for an electric vehicle. The control device comprises a whole vehicle control unit, a digital intelligent display screen, a motor control unit, a drive motor, a power battery pack and a battery management unit, wherein the whole vehicle control unit is respectively connected with the digital intelligent display screen, the motor control unit and the battery management unit through communication buses; the drive motor is in two-way connection with the motor control unit respectively through a signal wire harness and a power supply wire harness; the battery management unit is connected with the power battery pack through a detection signal wire harness. The battery management unit comprises a plurality of single power battery protection circuits, a low-electricity-quantity warning signal drive circuit, a discharging protection signal drive circuit and a charging protection signal drive circuit, and the whole vehicle control unit comprises a main control chip, a power input and adjustment port circuit, a separation sensor signal input port circuit, a communication port and a digital intelligent display screen output port circuit. According to the whole vehicle control device and the control method, safety performance is improved, energy is saved and low-carbon performance and environment protection are achieved.
Description
Technical field
The present invention relates to Control of Electric Vehicles field, particularly relate to a kind of electric automobile whole control device and control method thereof.
Background technology
In recent years, urban transport problems is day by day subject to people and pays close attention to, although automobile, motorcycle, etc. as walking-replacing tool, because of it, to have the advantage such as easy to use universal gradually in the world, but along with the continuous increase of city automobile, motorcycle recoverable amount, the problem of problem of environmental pollution and energy aspect is also day by day serious.Along with the continuous progress of novel high-energy secondary cell technology especially lithium-ion-power cell technology, the technological development of battery-operated motor cycle, electric bicycle, electric bicycle, electric recreation vehicle and applying day by day comes into one's own.
The novel high-energy such as lithium ion battery, Ni-MH battery secondary cell is with respect to lead-acid battery, and its energy Ratios density improves greatly, there is no environmental pollution, more and more applied, along with the expansion of maturation and the market scale of technology, its price also will significantly reduce, and will replace lead-acid battery.But because the novel high-energy such as lithium battery, Ni-MH battery secondary cell characteristic is more active; the voltage discharging and recharging, electric current and operational environment are had to strict requirement; overcharge or cross to put and all can cause its permanent damage; even bring potential safety hazard; ensure that electrokinetic cell is normally for motor vehicle provides drive energy; must be equipped with car load control unit, its operation is managed and protected.Adopting in the market lithium-ion-power cell is electric motor car driving and the administrative unit of electric energy, lack system, on the original electric motor car driver element taking lead-acid battery as electric energy, only increase defencive function simply, management to drive energy and protection all adopt defencive function simply to complete, both by the MOSFET in battery protection unit as controlling battery pack to the medium of motor conveying capacity, simultaneously battery protection unit controls MOSFET turn-offs battery pack major loop when or brownout too high as some monomer battery voltages in battery pack again, with the performer of safety of protection battery pack.Mainly there are three problems in these class methods:
(1) MOSFET, in the time of large current work, very easily damages because of overheated, cannot be under large current condition stable, reliably working for a long time; MOSFET in the time turn-offing battery pack major loop, because voltage is high, electric current conference produces larger surge impact, very easily damage be directly electrically connected with it and electric path on components and parts; For proof load equilibrium, battery protection unit, in will being equipped with MOSFET, also must be equipped with load balancing control module, technical sophistication, and cost is higher.
(2) there is no energy feedback charge protection, easily cause battery to overcharge.
(3) lack battery low-electricity quantity alarm function, easily cause motor vehicle to cast anchor in advancing midway, affect traffic safety.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of electric automobile whole control device and control method thereof are provided, improve security performance, energy savings, low-carbon environment-friendly.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of electric automobile whole control device,
Comprise car load control unit, digital intelligent display screen, motor control unit, drive motors, power battery pack and battery management unit;
Car load control unit is connected with digital intelligent display screen, motor control unit and battery management unit respectively by communication bus;
Drive motors is connected with motor control unit is two-way by signal wire harness, power supply wire harness respectively;
Battery management unit is connected with power battery pack by detection signal wire harness.
Preferably, described power battery pack is consisted of serial or parallel connection multiple single power batteries.
Preferably, described single power battery is lithium-ion-power cell or Ni-MH power cell.
Preferably; the described battery management unit being connected with power battery pack comprises multiple single power battery protective circuits, low electric weight alarm signal drive circuit, discharge prevention signal drive circuit and charge protection signal drive circuit, and single power battery protective circuit detects output line by overcharging, mistake is put detection output line and is connected with charge protection signal drive circuit, discharge prevention signal drive circuit and low electric weight alarm signal drive circuit respectively with low electric weight detection output line.
Preferably, in described power battery pack, each single power battery correspondence arranges a single power battery protective circuit.
Preferably, described drive motors is asynchronous AC motor, permagnetic synchronous motor or brshless DC motor.
Preferably, described car load control unit comprises Master control chip, power supply input and interface circuit, separation sensor signal input interface circuit, communication interface and digital intelligent display screen output interface circuit; Power supply input and interface circuit, separation sensor signal input interface circuit, communication interface, digital intelligent display screen output interface circuit are connected with Master control chip respectively; Power supply input and interface circuit are connected with external power source; Separation sensor signal input interface circuit is connected with separation sensor; Communication interface is connected with battery management unit, motor control unit respectively; Digital intelligent display screen output interface circuit is connected with intelligent display screen.
Preferably, described separation sensor comprises rotating speed separation sensor, voltage separation sensor, current separation transducer and temperature separation sensor.
A control method of utilizing described electric automobile whole control device, comprises the steps:
It is the real-time voltage value of cell in power battery pack that V is set; When charging electric vehicle, get the monomer battery voltage value that in power battery pack, voltage is the highest; When electric automobile electric discharge, get the monomer battery voltage value that in power battery pack, voltage is minimum, Vmax is the charge protection magnitude of voltage that cell allows, and Vlim is cell low-voltage alarming value, and Vmin is the discharge prevention magnitude of voltage that cell allows; Vmax, Vlim, Vmin magnitude of voltage are set according to the charge-discharge characteristic of battery;
Step 1, program start;
Step 2, judge that whether electric automobile is in charged state, be to perform step 3.1, otherwise execution step 3.2;
Step 3.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise execution step 8;
Step 3.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vmin, is to perform step 4.1, otherwise execution step 4.2;
Step 4.1, electric automobile keep charged state;
Step 4.2, judge whether electric automobile is on-position, is to perform step 5.1, otherwise execution step 5.2;
Step 5.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise carry out 6.1;
Step 5.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vlin, is to perform step 6.3, otherwise execution step 6.2;
Step 6.1, electric automobile enter mechanical braking state, execution step 9;
Step 6.2, enter low electric weight alert program, execution step 7;
Step 6.3, electric automobile normally move, execution step 8;
Step 7, whole-control system send Limited Current signal to electric machine controller, are carried out by electric machine controller, and electric automobile enters current limliting running status;
Step 8, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmin, is to perform step 9, otherwise execution step 5.2;
Step 9, judge whether electric automobile stops, and is to perform step 10, otherwise execution step 4.2;
Step 10, termination routine.
Compared with prior art, the invention has the beneficial effects as follows:
(1) realize the cell interconnection of the critical components such as battery management unit, motor control unit, charger, carried out unified management by car load control unit, formed the electric automobile whole control unit of control integration;
(2) power battery pack is monitored and management by battery management unit, carry out the charge and discharge protection to power battery pack, drive motors is controlled and management by motor control unit, and car load control unit is carried out control and the management of car load rank, has improved efficiency and the reliability of system;
(3) vehicle operating alarm can show by digital intelligent display screen, car load control unit control battery management unit limits power battery pack discharging current, control motor control unit restriction drive motors power output, tell that driver takes appropriate measures simultaneously, prevent that vehicle from casting anchor midway, improve drive safety;
(4) adopt energy feeding braking mode, effective 2 level system energy management patterns; Car load control unit is carried out the energy management of car load level, and battery management unit and electric-motor drive unit are carried out respectively the energy management of power battery pack and drive motors; For example: in power battery pack quantity of electric charge fully loaded situation, overcharging of energy feedback possibility structure battery pair, need to protect the battery of energy feedback charging, prevents battery overcharge.
Brief description of the drawings
Fig. 1 is device overall structure schematic diagram of the present invention;
fig. 2 is car load control unit structure principle chart of the present invention;
Fig. 3 is control method flow chart of the present invention.
Embodiment
Be elaborated with reference to accompanying drawing below in conjunction with embodiment, to technical characterictic of the present invention and advantage are interpretated more in-depth.
Device overall structure schematic diagram of the present invention as shown in Figure 1, as shown in Figure 1, electric automobile whole control device is specially an electric automobile whole control device for control integration, and this device comprises: car load control unit 1, communication bus 2, digital intelligent display screen 3, communication bus 4, other control control screen in subelement 5(for example electric air-conditioning subsystem, amusements), motor control unit 6, signal wire harness 7, drive motors 8, power supply wire harness 9, power battery pack 10, detection signal wire harness 11 and battery management unit 12; Battery management unit 12 is connected with power battery pack 10 by detection signal wire harness 11; Motor control unit 6 is connected with drive motors 8 with signal wire harness 7 by power supply wire harness 9; Battery management unit 12, motor control unit 6 are controlled subelement 5 with other and are connected with car load control unit 1 by communication bus 4; Car load control unit 1 is connected with digital intelligent display screen 3 by communication bus 2.
Motor control unit 6 is connected with car load control unit 1 by communication bus 4, for sending the information such as drive motors operating current, power, temperature; Battery management unit 12 is connected with car load control unit 1 by communication bus 4, for sending the information such as low charge alert signal, low-voltage variation signal and high voltage protective signal.The interior operational vehicle security of operation of car load control unit 1 and the energy management of car load level and control algolithm, carry out by communication bus 4 output informations to motor control unit 6 and battery management unit 12.The external digital intelligent display screen 3 of car load control unit 1, for showing vehicle operating information.
In the present invention, described power battery pack is consisted of serial or parallel connection multiple single power batteries.Described single power battery is lithium-ion-power cell or Ni-MH power cell.
As preferred embodiment of the present invention, the described battery management unit 12 being connected with power battery pack 10 comprises multiple single power battery protective circuits, low electric weight alarm signal drive circuit (shown in low electric weight for a threshold values is set, when being judged to be low electric weight lower than this threshold values), discharge prevention signal drive circuit and charge protection signal drive circuit, single power battery protective circuit is by overcharging detection output line, cross put detect output line and low electric weight detect output line respectively with charge protection signal drive circuit, discharge prevention signal drive circuit is connected with low electric weight alarm signal drive circuit.In described power battery pack, each single power battery correspondence arranges a single power battery protective circuit.
Motor control unit 6 can be selected the motor control unit having on market with car load control unit and battery management unit communication function, and motor control unit comprises main control chip, power supply input circuit, E-Gas signal input interface circuit, electric brake signal input interface circuit, rotating speed, voltage, electric current, temperature signal input interface circuit, communication interface, motor control signal output interface circuit; In main control chip, set up electronic differential function algorithm software.Motor control signal output interface circuit, communication interface, rotating speed, voltage, electric current, temperature signal input interface circuit, electric brake signal input interface circuit, E-Gas signal input interface circuit.Power supply input circuit connects external power and works power supply guarantee is provided for electric machine controller is normal; E-Gas signal input interface circuit is connected with E-Gas, and electric machine controller input is connected with efp by E-Gas signal input interface circuit, for obtaining E-Gas aperture position signalling; Electric brake signal input interface circuit is connected with electric brake pedal, and electric machine controller input is connected with electric brake pedal by electric brake signal input interface circuit, for obtaining electric brake aperture position signalling; Rotating speed, voltage, electric current, temperature signal input interface circuit are connected with the various kinds of sensors of rotating speed, voltage, electric current and temperature; Electric machine controller is connected with the various kinds of sensors of rotating speed, voltage, electric current and temperature by rotating speed, voltage, electric current, temperature signal input interface circuit, for obtaining rotating speed, voltage, electric current and state of temperature information.Driver's driving intention and travel condition of vehicle information that above input interface circuit gathers, deliver to main control chip by the on-chip bus such as data wire or SPI, I2C.Communication interface is connected with vehicle other system; Motor control signal output interface circuit is connected with motor; Electric machine controller carries out data interaction by communication interface and vehicle other system, for example whole-control system, battery management system.Master control chip is connected with motor by motor control signal output interface circuit.As 48v series attached brushless DC motor of electric vehicle controller, ET24350W controller for electric vehicle etc.
Preferably, described drive motors is asynchronous AC motor, permagnetic synchronous motor or brshless DC motor.Drive motors rated power scope 300w to 15Kw, range of nominal tension 24V to 96V.
As shown in Figure 2, car load control unit 1 comprises Master control chip 13, power supply input and conditioning interface circuit 14, separation sensor signal input interface circuit 15, communication interface 16, digital intelligent display screen output interface circuit 17 to car load control unit structure principle chart of the present invention; Power supply input and conditioning interface circuit 14, separation sensor signal input interface circuit 15, communication interface 16, digital intelligent display screen output interface circuit 17 are connected with Master control chip 13 respectively; Preferably, it is the embedded microprocessor of STM32F205VG that Master control chip 13 is selected model, has set up vehicle driving safety control and car load level energy management algorithm software in Master control chip 13.Power supply input and conditioning interface circuit 14, separation sensor signal input interface circuit 15, communication interface 16, digital intelligent display screen output interface circuit 17 can use with reference to corresponding parts in similar vehicles control class application product.Power supply input and conditioning interface circuit 14 connect external power, and the separation sensors such as separation sensor signal input interface circuit 15 and rotating speed, voltage, electric current, temperature are connected.The travel condition of vehicle information that above input interface circuit gathers, delivers to Master control chip 13 by the on-chip bus such as data wire or SPI, I2C.Communication interface 16 is connected with other unit of vehicle and intelligent display screen respectively with digital intelligent display screen output interface circuit 17; Vehicle driving safety control information exports battery management unit, motor control unit and other subelements to by communication interface 16 and carries out after Master control chip 13 vehicle driving safety control strategy computings.Energy management in Vehicle Driving Cycle process exports battery management unit, motor control unit and other subelements to by communication interface 16 after processing by the car load level energy management algorithm software in Master control chip 13 and carries out.Security alarm information exchange is crossed digital intelligent display screen output interface circuit 17 and is exported intelligent display screen display to and show.
As shown in Figure 3, a kind of control method of utilizing described electric automobile whole control device, comprises the steps: control method flow chart of the present invention
It is the real-time voltage value of cell in power battery pack that V is set; When charging electric vehicle, get the monomer battery voltage value that in power battery pack, voltage is the highest; When electric automobile electric discharge, get the monomer battery voltage value that in power battery pack, voltage is minimum, Vmax is the charge protection magnitude of voltage that cell allows, and Vlim is cell low-voltage alarming value, and Vmin is the discharge prevention magnitude of voltage that cell allows; Vmax, Vlim, Vmin magnitude of voltage are set according to the charge-discharge characteristic of battery;
Step 1, program start;
Step 2, judge that whether electric automobile is in charged state, be to perform step 3.1, otherwise execution step 3.2;
Step 3.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise execution step 8;
Step 3.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vmin, is to perform step 4.1, otherwise execution step 4.2;
Step 4.1, electric automobile keep charged state;
Step 4.2, judge whether electric automobile is on-position, is to perform step 5.1, otherwise execution step 5.2;
Step 5.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise carry out 6.1;
Step 5.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vlin, is to perform step 6.3, otherwise execution step 6.2;
Step 6.1, electric automobile enter mechanical braking state, execution step 9;
Step 6.2, enter low electric weight alert program, execution step 7;
Step 6.3, electric automobile normally move, execution step 8;
Step 7, whole-control system send Limited Current signal to electric machine controller, are carried out by electric machine controller, and electric automobile enters current limliting running status;
Step 8, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmin, is to perform step 9, otherwise execution step 5.2;
Step 9, judge whether electric automobile stops, and is to perform step 10, otherwise execution step 4.2;
Step 10, termination routine.
Control method of the present invention is specially: shown in the electric automobile whole control device power battery pack energy manage workflow figure of control integration, V is the real-time voltage value of cell in power battery pack; when charging; get the monomer battery voltage value that in power battery pack, voltage is the highest; when electric discharge; get the monomer battery voltage value that in power battery pack, voltage is minimum; Vmax is the charge protection magnitude of voltage that cell allows; Vlim is cell low-voltage alarming value, and Vmin is the discharge prevention magnitude of voltage that cell allows.Vmax, Vlim, Vmin magnitude of voltage are set according to the charge-discharge characteristic of the various batteries such as LiFePO4, LiMn2O4, ternary material lithium ion battery, Ni-MH battery.For example, for ferric phosphate lithium ion battery, allow charging ceiling voltage, electric discharge low-voltage alarm voltage and minimum discharge voltage can be set as respectively 3.8V, 2.5V, 2.2V.In electric automobile normal course of operation, power battery pack provides electric energy to motor control unit, and motor drives electric motor car to move ahead.Battery management unit 12 detects cell running status in power battery pack 10 and battery pack in real time, battery power discharge in normal course of operation, in the time having cell minimum voltage to reach low charge alert voltage in battery pack, be V<Vlim, battery management unit 12 is sent to car load control unit 1 by communication bus 4 information, other unit various information of car load control unit 1 comprehensive vehicle export each subelement to by communication bus 4 again and carry out after vehicle driving safety control in Master control chip 13 and car load level energy management algorithm calculation process, export digital intelligent display screen 3 to by communication bus 2 shows simultaneously.
The corresponding control strategy restriction drive current of drive motors 8 and the discharging current of power battery pack 10 are taked in the control information that motor control unit 6 can provide according to car load control unit 1.When power battery pack 10 is in discharge process; while having monomer battery voltage to reach low-voltage variation voltage; be V<Vmin; battery management unit 12 sends low-voltage variation information by communication bus 4 to car load control unit 1; control motor control unit 6 by car load control unit 1 and take corresponding safeguard measure; for example: cut off drive motors main circuit power, prevent battery pack overdischarge.When in the process of vehicle in charging or braking energy feedback charging; while having cell charging voltage to reach permission charging ceiling voltage in power battery pack 10; be V>Vmax; battery management unit 12 sends low-voltage variation information by communication bus 4 to car load control unit 1; control motor control unit by car load control unit 1 and take control measure; for example: forbid power battery pack to continue charging, damage power battery pack prevents from overcharging.
The present invention is applied to light-weight electric vehicle complete vehicle control device, its operation principle is as follows: light-weight electric Automobile Design speed per hour 60km/h, adopt the DC brushless motor of rated power 7.5W, power battery pack adopts the ferric phosphate lithium cell series connection of 24 120AH, rated voltage 72V.According to ferric phosphate lithium cell characteristic, monomer battery voltage high voltage protective value is set as 3.8V, and low-voltage variation value is set as 2.5V, and low charge alert magnitude of voltage is set as 2.8V.
In light-weight electric car running process, power battery pack 10 is given electric automobile and the power supply of each control unit, drives electric automobile operation.Battery management unit 12 is monitored the state information such as each monomer battery voltage, electric current, temperature, electric weight in power battery pack, export car load control unit 1 to by communication bus 4, car load control unit 1 exports digital intelligent display screen 3 to by communication bus 2 and shows; The state informations such as motor control unit 6 monitoring driving motor 8 electric currents, temperature, rotating speed, moment of torsion export car load control unit 1 to by communication bus 4, and car load control unit 1 exports digital intelligent display screen 3 to by communication bus 2 and shows; The comprehensive battery management unit 12 of car load control unit 1, motor control unit 6 and other control subelement 5 running state information; carry out calculation process through interior vehicle driving safety and car load level energy management strategy; exporting each control unit to by communication bus 4 carries out; with protection Vehicle Driving Cycle and each cell operation safety, concrete control method is as follows:
1, when light-weight electric automobilism, in the time that in power battery pack 10, some cells reach 2.8V, battery management unit 12 sends low charge alert information by communication bus 4 to car load control unit 1, car load control unit 1 is controlled motor control unit 6 and is carried out after control algolithm is processed, send audible and visual alarm signal by communication bus 2 to intelligent display screen 3 simultaneously, tell driver to take appropriate measures, prevent that vehicle from casting anchor midway, improve driving safety.Motor control unit 6 receives after signal, power battery pack 10 discharging currents is limited to restriction drive motors 8 power outputs.
2, when light-weight electric automobilism; in the time that in power battery pack 10, some monomer battery voltages reach 2.5V; battery management unit 12 sends low-voltage variation information to car load control unit 1; car load control unit 1 is controlled motor control unit 6 and is carried out after control algolithm is processed; comprise current limliting reduction of speed; turn-off power battery pack 10 major loops, prevent electrokinetic cell overdischarge, protection cell safety.
3, when light-weight electric vehicle charging; in the time that in power battery pack 10, some monomer battery voltages reach high pressure 3.8V; battery management unit 12 sends high voltage protective information to car load control unit 1; car load control unit 1 charge closing machine automatically cut-out power battery pack 10 connect with charger, prevent battery overcharge.
4, when light-weight electric automobile brake; can realize energy feedback; in power battery pack 10 quantity of electric charge fully loaded situations; overcharging of energy feedback possibility structure battery pair; need to protect the battery of energy feedback charging; its method is in the time that in power battery pack 10, some monomer battery voltages reach 3.8V; battery management unit 12 sends high voltage protective information to car load control unit 1; car load control unit 1 is controlled motor control unit 6 and is taked corresponding measure; no longer carry out energy feedback charging to power battery pack 10, prevent battery overcharge.
By the technical scheme in above embodiment, the present invention is carried out to clear, complete description, the embodiment that obvious described embodiment is a part of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Claims (10)
1. an electric automobile whole control device, is characterized in that:
Comprise car load control unit, digital intelligent display screen, motor control unit, drive motors, power battery pack and battery management unit;
Car load control unit is connected with digital intelligent display screen, motor control unit and battery management unit respectively by communication bus;
Drive motors is connected with motor control unit is two-way by signal wire harness, power supply wire harness respectively;
Battery management unit is connected with power battery pack by detection signal wire harness.
2. electric automobile whole control device according to claim 1, is characterized in that: described power battery pack is consisted of serial or parallel connection multiple single power batteries.
3. electric automobile whole control device according to claim 2, is characterized in that: described single power battery is lithium-ion-power cell or Ni-MH power cell.
4. electric automobile whole control device according to claim 3; it is characterized in that: the described battery management unit being connected with power battery pack comprises multiple single power battery protective circuits, low electric weight alarm signal drive circuit, discharge prevention signal drive circuit and charge protection signal drive circuit, single power battery protective circuit detects output line by overcharging, mistake is put detection output line and is connected with charge protection signal drive circuit, discharge prevention signal drive circuit and low electric weight alarm signal drive circuit respectively with low electric weight detection output line.
5. electric automobile whole control device according to claim 4, is characterized in that: in described power battery pack, each single power battery correspondence arranges a single power battery protective circuit.
6. electric automobile whole control device according to claim 1, is characterized in that: described drive motors is asynchronous AC motor, permagnetic synchronous motor or brshless DC motor.
7. electric automobile whole control device according to claim 1, is characterized in that: described car load control unit comprises Master control chip, power supply input and interface circuit, separation sensor signal input interface circuit, communication interface and digital intelligent display screen output interface circuit; Power supply input and interface circuit, separation sensor signal input interface circuit, communication interface, digital intelligent display screen output interface circuit are connected with Master control chip respectively.
8. electric automobile whole control device according to claim 7, is characterized in that: described power supply input and interface circuit are connected with external power source; Separation sensor signal input interface circuit is connected with separation sensor; Communication interface is connected with battery management unit, motor control unit respectively; Digital intelligent display screen output interface circuit is connected with intelligent display screen.
9. electric automobile whole control device according to claim 8, is characterized in that: described separation sensor comprises rotating speed separation sensor, voltage separation sensor, current separation transducer and temperature separation sensor.
10. a control method of utilizing the electric automobile whole control device described in any one in claim 1-9, is characterized in that, comprises the steps:
It is the real-time voltage value of cell in power battery pack that V is set; When charging electric vehicle, get the monomer battery voltage value that in power battery pack, voltage is the highest; When electric automobile electric discharge, get the monomer battery voltage value that in power battery pack, voltage is minimum, Vmax is the charge protection magnitude of voltage that cell allows, and Vlim is cell low-voltage alarming value, and Vmin is the discharge prevention magnitude of voltage that cell allows; Vmax, Vlim, Vmin magnitude of voltage are set according to the charge-discharge characteristic of battery;
Step 1, program start;
Step 2, judge that whether electric automobile is in charged state, be to perform step 3.1, otherwise execution step 3.2;
Step 3.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise execution step 8;
Step 3.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vmin, is to perform step 4.1, otherwise execution step 4.2;
Step 4.1, electric automobile keep charged state;
Step 4.2, judge whether electric automobile is on-position, is to perform step 5.1, otherwise execution step 5.2;
Step 5.1, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmax, is to carry out 4.1, otherwise carry out 6.1;
Step 5.2, obtain the real-time voltage value V of cell in power battery pack, judge whether V is greater than Vlin, is to perform step 6.3, otherwise execution step 6.2;
Step 6.1, electric automobile enter mechanical braking state, execution step 9;
Step 6.2, enter low electric weight alert program, execution step 7;
Step 6.3, electric automobile normally move, execution step 8;
Step 7, whole-control system send Limited Current signal to electric machine controller, are carried out by electric machine controller, and electric automobile enters current limliting running status;
Step 8, obtain the real-time voltage value V of cell in power battery pack, judge whether V is less than Vmin, is to perform step 9, otherwise execution step 5.2;
Step 9, judge whether electric automobile stops, and is to perform step 10, otherwise execution step 4.2;
Step 10, termination routine.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107689655A (en) * | 2017-09-08 | 2018-02-13 | 代炎利 | The over method and overdischarge protector of a kind of battery |
| CN109466376A (en) * | 2019-01-03 | 2019-03-15 | 淮海工学院 | A kind of mine locomotive lithium battery startup power supply battery management system |
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| CN111268006A (en) * | 2020-03-24 | 2020-06-12 | 浙江睿璞智能汽车股份有限公司 | Control system of electric distribution vehicle |
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|---|---|
| CN104184191B (en) | 2016-11-02 |
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