CN109159668A - For the DC voltage converting system and its control method of electric car, medium - Google Patents
For the DC voltage converting system and its control method of electric car, medium Download PDFInfo
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- CN109159668A CN109159668A CN201811177991.5A CN201811177991A CN109159668A CN 109159668 A CN109159668 A CN 109159668A CN 201811177991 A CN201811177991 A CN 201811177991A CN 109159668 A CN109159668 A CN 109159668A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005611 electricity Effects 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
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- 239000013589 supplement Substances 0.000 description 11
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- 230000007774 longterm Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009469 supplementation Effects 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H02J7/0077—
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The present invention provides a kind of for the DC voltage converting system and its control method of electric car, medium, wherein system includes: entire car controller；High voltage power supply, for providing electric energy to driving load；Low-tension supply is connect with the entire car controller, for providing electric energy to vehicle low-voltage load；Electric pressure converter is connect with the entire car controller, the high voltage power supply and the low-tension supply, for realizing that the high voltage power supply provides electric energy for the low-tension supply and/or the vehicle low-voltage load under the control of the entire car controller.The present invention avoids low pressure baby battery from damaging due to power shortage, extends the service life of low pressure baby battery.
Description
Technical field
The present invention relates to New-energy electric vehicle power management techniques, more particularly to suitable for New-energy electric vehicle
DC/DC electric pressure converter (dc voltage changer) is specifically exactly a kind of DC voltage conversion system for electric car
System and its control method, medium.
Background technique
The energy and environmental issue have become in current world economy development process distinct issues the most, and influence me
One of most important factor of state's strategy of sustainable development.In recent years, with the increasingly reduction of world energy sources resource and car tail
Gas bring problem of environmental pollution highlights, and the development of orthodox car is restricted, on the contrary, the development of new-energy automobile receives
More and more by the attention of national governments.Currently, developing great attention of the new-energy automobile by various countries, equally, China
Government also vigorously supports the development of new-energy automobile.
Under normal conditions, pure electric vehicle new-energy automobile includes two power supply systems of high voltage power supply and low voltage electric power system
System.Wherein, high voltage power supply mainly provides energy to vehicle drive system, for example, to driving motor and interior air-conditioning system
Energy is provided；Low voltage electric power system is for providing electric energy to vehicle low-voltage load (i.e. vehicle low-voltage load system), for example, lamp
Photosystem, audio-video system etc..In order to provide energy to low-voltage-powered battery (i.e. low pressure baby battery) and vehicle low-voltage load system
Amount, New-energy electric vehicle will be installed a dc voltage changer (DC/DC electric pressure converter), for changing high voltage power supply dress
Energy is provided at low-tension supply for low pressure baby battery and vehicle low-voltage load system.
In the prior art, only power supply exports the DC/DC electric pressure converter that New-energy electric vehicle uses all the way, the power supply
Output is connect with vehicle low-voltage load system, low pressure baby battery, and after vehicle ignition switch is opened, DC/DC electric pressure converter is
Can work, and then for vehicle low-voltage load system provide energy and be low pressure baby battery supplement energy.In realizing use process,
When vehicle after a long time placement, after low pressure baby battery power shortage how electric energy supplement the problem of.Such as: when New-energy electric vehicle because
It is placed for a long time for certain reasons, vehicle low-voltage load system needs low pressure baby battery to provide memory power supply, and the small electricity of low pressure
The problem of there is also self discharges in pond, so, low pressure baby battery will lose after New-energy electric vehicle places a period of time
Electricity will result in low pressure baby battery permanent damage if electricity cannot be mended for low pressure baby battery for a long time.
In addition, because the output power of DC/DC electric pressure converter is larger (general output power is at 1000 watts or so), in order to
Meet that DC/DC electric pressure converter output power, electric current be big, the higher demand of temperature rise, output interface generally uses a power
Biggish connector satisfies the use demand.But DC/DC electric pressure converter output interface is patched using a power is biggish
Part satisfies the use demand, and connector current density, volume and higher cost, craftsmanship is poor, inside DC/DC electric pressure converter
The temperature rise of circuit will be very high, and then reduces the service life of DC/DC electric pressure converter.
Therefore, those skilled in the art need to research and develop a kind of DC/DC voltage conversion system suitable for electric car, prevent
While low pressure baby battery long-term power shortage, extend the service life of DC/DC electric pressure converter.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that providing a kind of DC voltage conversion for electric car
System and its control method, medium solve prior art mesolow baby battery and are easy power shortage after a long time placement and damage
Problem also solves the problems, such as that existing DC/DC electric pressure converter is at high cost, service life is short.
In order to solve the above-mentioned technical problem, a specific embodiment of the invention provides a kind of direct current for electric car
Press converting system, comprising: entire car controller；High voltage power supply, for providing electric energy to driving load；Low-tension supply, and it is described whole
Vehicle controller connection, for providing electric energy to vehicle low-voltage load；Electric pressure converter, with the entire car controller, the high pressure
Power supply is connected with the low-tension supply, for realizing that the high voltage power supply is the low pressure under the control of the entire car controller
Power supply and/or the vehicle low-voltage load provide electric energy.
A specific embodiment of the invention also provides a kind of control method of DC voltage converting system, comprising: acquisition electricity
The ignition lock state information of electrical automobile and the current voltage of low-tension supply；According to the ignition lock state information and described work as
Preceding voltage control electric pressure converter provides electric energy for the low-tension supply and/or vehicle low-voltage load.
A specific embodiment of the invention also provides a kind of computer storage medium comprising computer executed instructions, described
When computer executed instructions are handled via data processing equipment, which executes the control of DC voltage converting system
Method.
Above-mentioned specific embodiment according to the present invention is it is found that be used for the DC voltage converting system and its control of electric car
Method processed, medium at least have the advantages that in the state of the ignition switch of electric car opening, entire car controller
(VCU) control DC/DC electric pressure converter exports electric energy according to load power demand, meets the power need of vehicle low-voltage load system
It asks, extends the service life of low pressure baby battery (low-tension supply)；Under the ignition switch closed state of electric car, full-vehicle control
When device detects that low pressure baby battery requires supplementation with electricity, the not enabled output of vehicle control unit controls DC/DC electric pressure converter is with perseverance
Pressing current-limiting mode is that low pressure baby battery supplements electricity；Under the ignition switch open state of electric car, vehicle control unit controls
DC/DC electric pressure converter provides electric energy according to the enabled output of load power demand for vehicle low-voltage load, and is low pressure baby battery
Supplement electricity；In the case where ignition switch is opened, and low-tension supply not power shortage when, low-tension supply and electric pressure converter are simultaneously
For the power supply of vehicle low-voltage load.The output connector being connected in parallel using two substitutes original high-power connector, both reduces
Process costs, and improve the service life of DC/DC electric pressure converter.
It is to be understood that above-mentioned general description and following specific embodiments are merely illustrative and illustrative, not
The range of the invention to be advocated can be limited.
Detailed description of the invention
Following appended attached drawing is part of specification of the invention, depicts example embodiments of the present invention, institute
Attached drawing is used to illustrate the principle of the present invention together with the description of specification.
Fig. 1 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example one.
Fig. 2 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example two.
Fig. 3 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example three.
Fig. 4 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example four.
Fig. 5 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention provides
The flow chart of the embodiment one of method.
Fig. 6 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention provides
The flow chart of the embodiment two of method.
Description of symbols:
1 entire car controller, 2 high voltage power supply
3 low-tension supply, 4 electric pressure converter
5 first output connector, 6 second output connector
11 data acquisition unit, 12 control unit
13 CAN interface L CAN bus
M driving load
C enables control line RL vehicle low-voltage load
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will with attached drawing and in detail
Narration clearly illustrates the spirit of disclosed content, and any skilled artisan is understanding the content of present invention
After embodiment, when the technology that can be taught by the content of present invention, it is changed and modifies, without departing from the essence of the content of present invention
Mind and range.
The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not as a limitation of the invention.
In addition, in the drawings and embodiments the use of element/component of same or like label is for representing same or like portion
Point.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position,
It is non-to limit the present invention, only for distinguish with same technique term description element or operation.
About direction term used herein, such as: upper and lower, left and right, front or rear etc. are only the sides with reference to attached drawing
To.Therefore, the direction term used is intended to be illustrative and not intended to limit this creation.
It is open term, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc.
Mean including but not limited to.
About it is used herein " and/or ", including any of the things or all combination.
It include " two " and " two or more " about " multiple " herein；It include " two groups " about " multiple groups " herein
And " more than two ".
About term used herein " substantially ", " about " etc., to modify it is any can be with the quantity or mistake of microvariations
Difference, but this slight variations or error can't change its essence.In general, microvariations that such term is modified or error
Range in some embodiments can be 20%, in some embodiments can be 10%, can be in some embodiments 5% or its
His numerical value.It will be understood by those skilled in the art that the aforementioned numerical value referred to can be adjusted according to actual demand, it is not limited thereto.
Fig. 1 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example one as shown in Figure 1, vehicle control unit controls high voltage power supply gives driving load supplying, and controls low tension
Source powers to vehicle low-voltage load, and also the high-voltage electricity of high voltage power supply is converted to low tension supply low tension by control electric pressure converter
Source and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the DC voltage converting system for electric car includes full-vehicle control
Device VCU1, high voltage power supply 2, low-tension supply 3 and electric pressure converter 4.Wherein, high voltage power supply 2 by electric pressure converter 4 with it is described whole
Vehicle controller 1 connects, and high voltage power supply 2 is used to provide electric energy to driving load M；Low-tension supply 3 and the entire car controller 1 connect
It connects, low-tension supply 3 is used to provide electric energy to vehicle low-voltage load RL；Electric pressure converter 4 and the entire car controller 1, the height
Voltage source 2 and the low-tension supply 3 connect, and electric pressure converter 4 is for realizing the height under the control of the entire car controller 1
Voltage source 2 provides electric energy for the low-tension supply 3 and/or the vehicle low-voltage load RL, specifically includes: in the point of electric car
Under fire switch closed state, when entire car controller 1 detects that low pressure baby battery 3 requires supplementation with electricity, entire car controller 1 is controlled
The not enabled output of DC/DC electric pressure converter 4 supplements electricity by low pressure baby battery 3 of constant voltage and current limiting mode；In the point of electric car
Under fire switch open state, it is whole that entire car controller 1, which controls DC/DC electric pressure converter 4 according to the enabled output of load power demand,
Vehicle low-voltage load RL provides electric energy, and supplements electricity for low pressure baby battery 3；In the case where ignition switch is opened, and low pressure
Baby battery 3 not power shortage when, DC/DC electric pressure converter 4 is whole with low pressure baby battery 3 according to the enabled output of load power demand simultaneously
Vehicle low-voltage load RL power supply.
In the embodiment of the present invention, electric pressure converter 4 can be DC/DC electric pressure converter, and DC/DC electric pressure converter can be with
Carry out high-low voltage conversion；Low-tension supply 3 can be low pressure baby battery；Driving load M includes driving motor and interior air-conditioning etc.；
Vehicle low-voltage load RL includes lighting system and sound system etc..
Referring to Fig. 1, electric pressure converter 4 converts the high voltage direct current of high voltage power supply 2 under the control of entire car controller 1
Low-tension supply 3 and/or the vehicle low-voltage load RL are supplied for low-voltage DC, prevents electric car since long-time is placed,
Since the self discharge of low pressure baby battery and vehicle low-voltage load RL (vehicle low-voltage load system) need to remember power supply and cause low pressure small
The long-term power shortage of battery, the case where causing low pressure baby battery permanent damages generation changes existing equipment small, realizes simple, user
Experience Degree is high.
Fig. 2 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example two, as shown in Fig. 2, a high-power connector is substituted using two output connectors being connected in parallel,
The current density of connector is low, small in size, at low cost.
In the specific embodiment shown in the drawings, the DC voltage converting system for electric car further includes first defeated
Connector 5 and the second output connector 6 out.Wherein, the setting of the first output connector 5 is in the electric pressure converter 4 and described low
Between voltage source 3；Second output connector 6 is connected in parallel with first output connector 5, the setting of the second output connector 6
Between the electric pressure converter 4 and the low-tension supply 3.
Referring to fig. 2, sharp in the prior art since the output power of electric pressure converter 4 is larger (usual output power is 1KW)
It is connected between electric pressure converter 4 and low-tension supply 3 with a high-power connector, due to the transmission electric current of high-power connector
Greatly, temperature increases, and technique is with high requirements and high cost, and is easily damaged；It is substituted with two output connectors being connected in parallel one big
Power connector, the current density of connector reduces, volume becomes smaller, and required technique also reduces, and consequent is cost
It reduces, and is hardly damaged, long service life.
Fig. 3 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example three, as shown in figure 3, the ignition lock state of the data acquisition unit acquisition electric car of entire car controller
Turned with the control unit of the current voltage of low-tension supply, entire car controller according to ignition lock state and current voltage control voltage
Parallel operation provides electric energy for low-tension supply and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the entire car controller 1 includes that data acquisition unit 11 and control are single
Member 12.Wherein, data acquisition unit 11 is connect with the low-tension supply 3, and data acquisition unit 11 is for acquiring electric car
The temperature of ignition lock state information, the current voltage of the low-tension supply 3 and the electric pressure converter 4；Control unit 12
It is connect with the electric pressure converter 4, control unit 12 is used for according to the ignition lock state information and the current voltage control
It makes the electric pressure converter 4 and provides electric energy for the low-tension supply 3 and/or the vehicle low-voltage load RL.Implementation of the invention
In example, the electric pressure converter 4 is DC/DC electric pressure converter；Data acquisition unit 11 is digital voltmeter；Control unit 12 is
Vehicle-mounted computer；The low-tension supply 3 is low pressure baby battery.It is described if the enabled control line C of the electric pressure converter is enabled
Electric pressure converter exports electric energy according to load power demand, then when the enabled control line C of the electric pressure converter is not enabled, institute
It states electric pressure converter and electric energy is exported in a manner of constant voltage and current limiting according to the state of low pressure baby battery.When electric car is in ignition switch shape
In the case that state is opened, entire car controller 1 is issued to electric pressure converter 4 by enabled control line C and is instructed, and makes it according to load function
Rate demand exports electric energy (for example, when enabled control line C is not enabled, output electric current is set as 35A ± 1A), and it is negative to meet vehicle low pressure
Carry RL power consumption demand, reduce low pressure baby battery (low-tension supply) discharge current, make as far as possible low pressure baby battery do not discharge or
Few electric discharge, makes battery capacity be in full power state, extends the service life of low pressure baby battery；When electric car is in ignition switch shape
In the case that state is closed, when entire car controller 1 detects that electric car low pressure baby battery needs to mend by data acquisition unit 11
When charge volume, vehicle control controller is issued to electric pressure converter 4 by enabled control line C and is instructed, and makes it in a manner of constant voltage and current limiting
Export low current be low pressure baby battery supplement electricity (for example, when enabled control line C is not enabled, output voltage be 13.5V~
13.8V, output electric current be 4A~6A), avoid low pressure baby battery from damaging due to normal phase power shortage, above-mentioned electric pressure converter 4 it is defeated
Voltage and output electric current are only reference data out, and user can according to need output voltage and the output of adjustment electric pressure converter 4
Electric current, invention is not limited thereto.
Referring to Fig. 3, when the ignition switch of electric car is opened, entire car controller 1 controls electric pressure converter 4 according to load
Power demand exports electric energy, meets the power demand of vehicle low-voltage load RL, extends the service life of low-tension supply 3；In battery
When the ignition switch of automobile is closed, entire car controller 1 detects that the voltage of low-tension supply 3 is lower than threshold value, when requiring supplementation with electricity,
Entire car controller 1 control electric pressure converter 4 using constant voltage and current limiting mode be low-tension supply 3 supplement electricity, avoid low-tension supply 3 due to
Long-term power shortage and damage, extend the service life of low-tension supply 3.
Fig. 4 is a kind of implementation for DC voltage converting system for electric car that the specific embodiment of the invention provides
The composition schematic diagram of example four, as shown in figure 4, can be configured when electric pressure converter has the function of CAN bus for entire car controller
CAN interface realizes the communication between entire car controller and electric pressure converter by CAN bus, instead of enabling the function of control line,
Meets the needs of system function.
In the specific embodiment shown in the drawings, the entire car controller 1 further includes CAN interface 13.Wherein, CAN connects
Mouth 13 is arranged between described control unit 12 and the electric pressure converter 4, and CAN interface 13 passes through for described control unit 12
CAN bus L controls the electric pressure converter 4.
Referring to fig. 4, the communication between control unit 12 and electric pressure converter 4, compatible existing electricity are realized using CAN bus L
The communication mode of electrical automobile does not need to carry out protocol conversion to the communication data of existing electric car, realizes simple, cost of implementation
It is low.
Fig. 5 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention provides
The flow chart of the embodiment one of method, as shown in figure 5, state and low tension of the entire car controller according to electric car ignition switch
The high voltage electric energy of high voltage power supply is converted to low-voltage electric energy and is supplied to low-tension supply by the current voltage in source, control electric pressure converter
And/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, the control method packet of the DC voltage converting system for electric car
It includes:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.Reality of the invention
It applies in example, ignition lock state information indicates that the state of ignition switch is specifically to open, or close.
Step 102: being described low according to the ignition lock state information and current voltage control electric pressure converter
Voltage source and/or vehicle low-voltage load provide electric energy.In the embodiment of the present invention, ignition lock state information indicates ignition switch
State be specifically open when, electric pressure converter provides electric energy for low-tension supply and vehicle low-voltage load；Ignition lock state letter
Breath instruction ignition switch state be specifically close, and the current voltage of low-tension supply be lower than threshold value (voltage threshold) when, electricity
Pressure converter provides electric energy for vehicle low-voltage load.
Referring to Fig. 5, voltage is controlled according to the current voltage of the ignition switch state in which of electric car and low-tension supply
Converter provides electric energy for low-tension supply and/or vehicle low-voltage load, prevents the long-term power shortage of low-tension supply and damages.
Fig. 6 is a kind of control for DC voltage converting system for electric car that the specific embodiment of the invention provides
The flow chart of the embodiment two of method, as shown in fig. 6, being controlled according to the current voltage of ignition lock state information and low-tension supply
Electric pressure converter provides electric energy for low-tension supply and/or vehicle low-voltage load.
In the specific embodiment shown in the drawings, step 102 is specifically included:
Step 1021: the open and-shut mode of ignition switch is judged according to the ignition lock state information.Implementation of the invention
In example, ignition lock state information indicates the opening and closing of ignition switch.
Step 1022: when ignition lock state information instruction ignition switch is opened, controlling the electric pressure converter
Electric energy, which is exported, according to load power demand provides electric energy to the low-tension supply and vehicle low-voltage load.The embodiment of the present invention
In, when the electric pressure converter exports electric energy according to load power demand, the enabled control line of the electric pressure converter enables defeated
Out.If the enabled control line of electric pressure converter enables output, electric pressure converter exports electric energy according to load power demand, that
When the enabled control line of electric pressure converter is not enabled, electric pressure converter exports electric energy in a manner of constant voltage and current limiting.
Step 1023: when ignition lock state information instruction ignition switch is closed, further judging described current
Whether voltage is less than voltage threshold.
Step 1024: when the current voltage is less than the voltage threshold, controlling the electric pressure converter and limited with constant pressure
Stream mode provides electric energy to the low-tension supply.In the embodiment of the present invention, the electric pressure converter is defeated in a manner of constant voltage and current limiting
Out when electric energy, the enabled control line of the electric pressure converter is not enabled.
Step 1025: when the current voltage is equal to the voltage threshold, controlling the electric pressure converter and stop as institute
It states low-tension supply and the vehicle low-voltage load provides electric energy；When being less than the voltage threshold such as current voltage, the electricity is controlled
Pressure converter continues as the low-tension supply and the vehicle low-voltage load provides electric energy.
Step 1026: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stop
Only electric energy is provided for the low-tension supply and the vehicle low-voltage load.
Referring to Fig. 6, electric pressure converter is controlled according to the current voltage of the ignition lock state of electric car and low-tension supply
Electric energy is provided for low-tension supply and/or vehicle low-voltage load, solves electric car because of the placement for a long time of certain reasons, low tension
The problem of source (low pressure baby battery) causes power shortage to damage after placing a period of time.
Specific embodiments of the present invention provide a kind of computer storage medium comprising computer executed instructions, the calculating
Machine executes instruction when handling via data processing equipment, which executes the controlling party of DC voltage converting system
Method.Method the following steps are included:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.
Step 102: being described low according to the ignition lock state information and current voltage control electric pressure converter
Voltage source and/or vehicle low-voltage load provide electric energy.
Specific embodiments of the present invention also provide a kind of computer storage medium comprising computer executed instructions, the meter
Calculation machine executes instruction when handling via data processing equipment, which executes the controlling party of DC voltage converting system
Method.Method the following steps are included:
Step 101: acquiring the ignition lock state information of electric car and the current voltage of low-tension supply.
Step 1021: the open and-shut mode of ignition switch is judged according to the ignition lock state information.
Step 1022: when ignition lock state information instruction ignition switch is opened, controlling the electric pressure converter
Electric energy, which is exported, according to load power demand provides electric energy to the low-tension supply and vehicle low-voltage load.
Step 1023: when ignition lock state information instruction ignition switch is closed, further judging described current
Whether voltage is less than voltage threshold.
Step 1024: when the current voltage is less than the voltage threshold, controlling the electric pressure converter and limited with constant pressure
Stream mode provides electric energy to the low-tension supply.
Step 1025: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stop
Only electric energy is provided for the low-tension supply and the vehicle low-voltage load；When being less than the voltage threshold such as current voltage, control
The electric pressure converter continues as the low-tension supply and the vehicle low-voltage load provides electric energy.
Step 1026: when the current voltage is greater than or equal to the voltage threshold, controlling the electric pressure converter and stop
Only electric energy is provided for the low-tension supply and the vehicle low-voltage load.
The specific embodiment of the invention provides a kind of for the DC voltage converting system and its control method of electric car, Jie
Matter, in the state that the ignition switch of electric car is opened, entire car controller (VCU) controls DC/DC electric pressure converter according to negative
Power demand output electric energy (can full power output) is carried, while giving low pressure baby battery electric energy supplement, meets vehicle low-voltage load
Power demand, extend low pressure baby battery service life；Under the ignition switch closed state of battery car, entire car controller
When detecting that low pressure baby battery requires supplementation with electricity, vehicle control unit controls DC/DC electric pressure converter is in a manner of constant voltage and current limiting
Low pressure baby battery supplements electricity；Under the ignition switch open state of battery car, the conversion of vehicle control unit controls DC/DC voltage
Device provides electric energy according to load power demand for vehicle low-voltage load, and supplements electricity for low pressure baby battery, prevents the small electricity of low pressure
Pond is damaged due to long-term power shortage.The output connector being connected in parallel using two substitutes original high-power connector, both drops
Low process costs, and improve the service life of DC/DC electric pressure converter.
The above-mentioned embodiment of the present invention can be implemented in various hardware, Software Coding or both combination.For example, this hair
Bright embodiment can also be the execution above method in data signal processor (Digital Signal Processor, DSP)
Program code.The present invention can also refer to computer processor, digital signal processor, microprocessor or field-programmable gate array
Arrange the multiple functions that (Field Programmable Gate Array, FPGA) is executed.Above-mentioned processing can be configured according to the present invention
Device executes particular task, and machine-readable software code or the firmware generation of the ad hoc approach that the present invention discloses are defined by executing
Code is completed.Software code or firmware code can be developed as different program languages and different formats or form.Can also be
Different target platform composing software codes.However, executing software code and the other types configuration generation of task according to the present invention
Different code pattern, type and the language of code do not depart from spirit and scope of the invention.
The foregoing is merely the schematical specific embodiments of the present invention, before not departing from conceptions and principles of the invention
It puts, the equivalent changes and modifications that any those skilled in the art is made should belong to the scope of protection of the invention.
Claims (10)
1. a kind of DC voltage converting system for electric car, which is characterized in that the system includes:
Entire car controller (1)；
High voltage power supply (2), for providing electric energy to driving load (M)；
Low-tension supply (3) is connect with the entire car controller (1), for providing electric energy to vehicle low-voltage load (RL)；And
Electric pressure converter (4) is connect with the entire car controller (1), the high voltage power supply (2) and the low-tension supply (3), is used
Realize that the high voltage power supply (2) are the low-tension supply (3) and/or described whole under the control in the entire car controller (1)
Vehicle low-voltage load (RL) provides electric energy.
2. being used for the DC voltage converting system of electric car as described in claim 1, which is characterized in that the system is also wrapped
It includes:
First output connector (5) is arranged between the electric pressure converter (4) and the low-tension supply (3)；And
The second output connector (6) being connected in parallel with first output connector (5) is arranged in the electric pressure converter
(4) between the low-tension supply (3).
3. being used for the DC voltage converting system of electric car as described in claim 1, which is characterized in that the full-vehicle control
Device (1) includes:
Data acquisition unit (11) is connect with the low-tension supply (3), and the ignition lock state for acquiring electric car is believed
The temperature of breath, the current voltage of the low-tension supply (3) and the electric pressure converter (4)；And
Control unit (12) is connect with the electric pressure converter (4), for according to the ignition lock state information and described working as
It is the low-tension supply (3) and/or the vehicle low-voltage load (RL) offer electricity that preceding voltage, which controls the electric pressure converter (4),
Energy.
4. being used for the DC voltage converting system of electric car as claimed in claim 3, which is characterized in that the full-vehicle control
Device (1) further include:
CAN interface (13) is arranged between described control unit (12) and the electric pressure converter (4), single for the control
First (12) control the electric pressure converter (4) by CAN bus (L).
5. being used for the DC voltage converting system of electric car as claimed in claim 3, which is characterized in that the voltage conversion
Device (4) is DC/DC electric pressure converter；The low-tension supply (3) is low pressure baby battery.
6. a kind of control method of the DC voltage converting system for electric car, which is characterized in that this method comprises:
Acquire the ignition lock state information of electric car and the current voltage of low-tension supply；And
It is the low-tension supply and/or whole according to the ignition lock state information and current voltage control electric pressure converter
Vehicle low-voltage load provides electric energy.
7. the control method for the DC voltage converting system of electric car as claimed in claim 6, which is characterized in that root
It is the low-tension supply and/or vehicle low pressure according to the ignition lock state information and current voltage control electric pressure converter
Load provides the step of electric energy, specifically includes:
The open and-shut mode of ignition switch is judged according to the ignition lock state information；
When ignition lock state information instruction ignition switch is opened, the electric pressure converter is controlled according to bearing power need
It asks and exports electric energy to the low-tension supply and vehicle low-voltage load offer electric energy；
When ignition lock state information instruction ignition switch is closed, further judge whether the current voltage is less than electricity
Press threshold value；And
When the current voltage is less than the voltage threshold, the electric pressure converter is controlled in a manner of constant voltage and current limiting to described low
Voltage source provides electric energy.
8. the control method for the DC voltage converting system of electric car as claimed in claim 7, which is characterized in that root
It is the low-tension supply and/or vehicle low pressure according to the ignition lock state information and current voltage control electric pressure converter
Load provides the step of electric energy, further includes:
When the current voltage is greater than or equal to the voltage threshold, controls the electric pressure converter and stop being the low tension
Source and the vehicle low-voltage load provide electric energy.
9. the control method for the DC voltage converting system of electric car as claimed in claim 7, which is characterized in that such as
When the enabled control line of electric pressure converter described in fruit is enabled, the electric pressure converter exports electric energy according to load power demand, that
When the enabled control line of the electric pressure converter is not enabled, the electric pressure converter exports electric energy in a manner of constant voltage and current limiting.
10. a kind of computer storage medium comprising computer executed instructions, the computer executed instructions are via data processing
When equipment processing, which requires the controlling party of 6~9 any DC voltage converting systems
Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811177991.5A CN109159668A (en) | 2018-10-10 | 2018-10-10 | For the DC voltage converting system and its control method of electric car, medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811177991.5A CN109159668A (en) | 2018-10-10 | 2018-10-10 | For the DC voltage converting system and its control method of electric car, medium |
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| CN201811177991.5A Pending CN109159668A (en) | 2018-10-10 | 2018-10-10 | For the DC voltage converting system and its control method of electric car, medium |
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