CN109278559A - Over-voltage protection method, system and the electric car of electric car - Google Patents
Over-voltage protection method, system and the electric car of electric car Download PDFInfo
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- CN109278559A CN109278559A CN201811033933.5A CN201811033933A CN109278559A CN 109278559 A CN109278559 A CN 109278559A CN 201811033933 A CN201811033933 A CN 201811033933A CN 109278559 A CN109278559 A CN 109278559A
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/003—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to inverters
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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention proposes over-voltage protection method, system and the electric car of a kind of electric car, method includes the following steps: the state of the low-voltage output of entire car controller monitoring current conversion equipment；When the abnormal state of the low-voltage output of current transfer device, entire car controller cuts off the output of the low-voltage output of current transfer device.The present invention has carried out second level management for the low voltage energy of electric car; realize second class protection; security function is reasonably allocated to the associated components in low voltage energy management system, reduces the security level requirement to DCDC, has achieved the effect that reduce cost and optimization system design.
Description
Technical field
The present invention relates to technical field of vehicle, in particular to a kind of over-voltage protection method of electric car, system and electronic
Automobile.
Background technique
Electric car converts low-voltage for the high voltage that power battery exports by DCDC, for filling to low tension battery
Electricity and for electrical appliance work electric energy is provided.If DCDC will lead to power battery height due to the failure of hardware or system
Voltage is linked into low-pressure system, and then is led to the over-voltage of vehicle low voltage equipment and damaged, and generates danger when driving
Danger.
In view of the above problems, presently relevant technology usually monitors low pressure output and physical isolation by DCDC, to avoid inciting somebody to action
Too high voltages imported into low-pressure system.But this technology can not guarantee voltage in hardware and entirely ineffective system
In the normal voltage range of low-pressure system, and then it may cause low-pressure system over-voltage.And all low-voltage safeties are come by DCDC
Guarantee, higher to the reliability and security requirement of DCDC, the design of DCDC needs to consider more redundancies to guarantee safety, into
And cause to increase cost and development difficulty.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, the first purpose of this invention is to propose a kind of over-voltage protection method of electric car, this method is directed to
The low voltage energy of electric car has carried out second level management, realizes second class protection, security function is reasonably allocated to low voltage energy pipe
Associated components in reason system reduce the security level requirement to DCDC, have reached the effect for reducing cost and optimization system design
Fruit.
Second object of the present invention is to propose a kind of overvoltage protective system of electric car.
Third object of the present invention is to propose a kind of electric car.
To achieve the goals above, the embodiment of first aspect present invention proposes a kind of overvoltage protection side of electric car
Method, comprising the following steps: the state of the low-voltage output of entire car controller monitoring current conversion equipment；When the electric current converting means
When the abnormal state for the low-voltage output set, the entire car controller cuts off the defeated of the low-voltage output of the current transfer device
Out.
In addition, the over-voltage protection method of electric car according to the above embodiment of the present invention can also have it is following additional
Technical characteristic:
In some instances, the state of the low-voltage output of the entire car controller monitoring current conversion equipment, comprising: prison
Survey the voltage of the low-voltage output output of the current transfer device.
In some instances, described when the abnormal state of the low-voltage output of the current transfer device, the vehicle
Controller cuts off the output of the low-voltage output of the current transfer device, comprising: judges the low pressure of the current transfer device
Whether the voltage of output end output is greater than predetermined voltage；If it is, cut off the low-voltage output of the current transfer device
Output.
In some instances, the output of the low-voltage output of the cutting current transfer device, comprising: the vehicle
Controller controls relay and disconnects, wherein the relay is located at the low-voltage output and vehicle of the current transfer device
Between low voltage equipment.
In some instances, further includes: the entire car controller monitors whether the current transfer device breaks down；When
When the current transfer device breaks down, start the state for monitoring the low-voltage output of the current transfer device.
The over-voltage protection method of electric car according to an embodiment of the present invention is turned by entire car controller real-time monitoring electric current
The state of the low-voltage output of changing device, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC,
And then guarantee associated components safety and traffic safety, and carried out second level management for the low voltage energy of electric car, realize two
Security function is reasonably allocated to the associated components in low voltage energy management system, reduces the security level to DCDC by grade protection
It is required that having achieved the effect that reduce cost and optimization system design.
To achieve the goals above, the embodiment of second aspect of the present invention proposes a kind of overvoltage protection system of electric car
System, comprising: power battery；Turn the current transfer device of low-voltage direct for carrying out high voltage direct current, the current transfer device
High voltage input terminal is connected with the power battery, and the low-voltage output of the current transfer device passes through relay and low pressure electricity consumption
Equipment is connected；Entire car controller, the entire car controller have monitoring side and control terminal, and the monitoring side and the electric current are converted
The low-voltage output of device is connected, and to monitor the state of the low-voltage output, the control terminal is connected with relay, in institute
When stating the abnormal state of the low-voltage output of current transfer device, controls the relay and disconnect to cut off the electric current converting means
The output for the low-voltage output set.
In addition, the overvoltage protective system of electric car according to the above embodiment of the present invention can also have it is following additional
Technical characteristic:
In some instances, the entire car controller is used to monitor the low-voltage output output of the current transfer device
Voltage.
In some instances, the entire car controller is used to judge the low-voltage output output of the current transfer device
Whether voltage is greater than predetermined voltage, when the voltage that the low-voltage output of the current transfer device exports is greater than the predetermined voltage
When, it controls the relay and disconnects to cut off the output of the low-voltage output of the current transfer device.
In some instances, the entire car controller is also used to monitor whether the current transfer device breaks down, and
When the current transfer device breaks down, start the state for monitoring the low-voltage output of the current transfer device.
The overvoltage protective system of electric car according to an embodiment of the present invention is turned by entire car controller real-time monitoring electric current
The state of the low-voltage output of changing device, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC,
And then guarantee associated components safety and traffic safety, and carried out second level management for the low voltage energy of electric car, realize two
Security function is reasonably allocated to the associated components in low voltage energy management system, reduces the security level to DCDC by grade protection
It is required that having achieved the effect that reduce cost and optimization system design.
To achieve the goals above, the embodiment of third aspect present invention proposes a kind of electric car, including the present invention
The overvoltage protective system of electric car described in above-described embodiment.
Electric car according to an embodiment of the present invention, the low pressure by entire car controller real-time monitoring current transfer device are defeated
The state of outlet, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC, and then guarantee dependent part
Part safety and traffic safety, and second level management has been carried out for the low voltage energy of electric car, second class protection is realized, by safe function
The associated components that can be reasonably allocated in low voltage energy management system reduce the security level requirement to DCDC, have reached reduction
The effect of cost and optimization system design.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart of the over-voltage protection method of electric car according to an embodiment of the invention；
Fig. 2 is the structural block diagram of the overvoltage protective system of electric car according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Over-voltage protection method, system and the electronic vapour of electric car according to an embodiment of the present invention are described below in conjunction with attached drawing
Vehicle.
Fig. 1 is the flow chart of the over-voltage protection method of electric car according to an embodiment of the invention.As shown in Figure 1,
Method includes the following steps:
Step S1: the low pressure of entire car controller (Vehicle Control Unit, VCU) monitoring current conversion equipment DCDC
The state of output end.
In one embodiment of the invention, the state of the low-voltage output of entire car controller monitoring current conversion equipment,
It specifically includes: the voltage of the low-voltage output output of monitoring current conversion equipment DCDC.
Step S2: when the abnormal state of the low-voltage output of current transfer device, entire car controller cuts off electric current conversion
The output of the low-voltage output of device.Specifically, i.e. (i.e. by the low-pressure state of entire car controller VCU real-time monitoring DCDC
The voltage of low-voltage output), in case of abnormal (such as over-voltage), then cut off current transfer device DCDC and low voltage equipment it
Between connection, i.e., directly cut off the low pressure output of DCDC, and then guarantee each piece safety and traffic safety.In other words, pass through
DCDC itself has implemented first order protection.
In one embodiment of the invention, when the abnormal state of the low-voltage output of current transfer device, vehicle control
The output of the low-voltage output of device cutting current transfer device processed, specifically includes: judging the low-voltage output of current transfer device
Whether the voltage of output is greater than predetermined voltage (judging whether over-voltage)；If it is, the low pressure of cutting current transfer device is defeated
The output of outlet.Specifically, judging whether DCDC occurs over-voltage exception, if over-voltage exception occurs for DCDC, directly cut
The low pressure output of disconnected DCDC, and then guarantee each component (such as low voltage equipment) safety and traffic safety.
In one embodiment of the invention, the output of the low-voltage output of entire car controller cutting current transfer device,
Specifically include: vehicle control unit controls relay disconnects, wherein relay is located at the low-voltage output and vehicle of current transfer device
Low voltage equipment between.Specifically, low-voltage output and the low pressure electricity consumption of current transfer device is arranged in relay
Between equipment, when over-voltage exception occurs, entire car controller VCU controls relay and disconnects, that is, is disconnected current transfer device
Connection between the low-voltage output and low voltage equipment of DCDC guarantees that each component is (low to cut off the low pressure output of DCDC
Press electrical equipment) safety and traffic safety.In other words, controlling relay by VCU realizes second level protection, reduces DCDC
Security level.
In one embodiment of the invention, this method further include: whether entire car controller monitoring current conversion equipment is sent out
Raw failure；When current transfer device breaks down, start the state of the low-voltage output of monitoring current conversion equipment.It that is to say
It says, when current transfer device DCDC breaks down, starts the state of the low-voltage output of monitoring current conversion equipment DCDC (such as
Voltage), and then judge whether the state of the low-voltage output of current transfer device is abnormal (such as over-voltage), improves the peace of each component
Full property and travel safety.
To sum up, the over-voltage protection method of the electric car of the embodiment of the present invention, using two-stage low pressure monitoring strategies, the first order
Low pressure output monitoring is carried out by DCDC itself, if discovery low pressure output overvoltage, cutoff low output；The second level passes through vehicle
Controller VCU is monitored the low pressure output of DCDC, carries out eventually when the DCDC first order, which monitors, to fail and when monitoring over-voltage
Pole protection, disconnecting relay by VCU ensures to cut off the low pressure output of DCDC, and then ensure that the safety of low-pressure system, reduces
The security level of DCDC, and do not increase any hardware, it is at low cost.
The over-voltage protection method of electric car according to an embodiment of the present invention is turned by entire car controller real-time monitoring electric current
The state of the low-voltage output of changing device, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC,
And then guarantee associated components safety and traffic safety, and carried out second level management for the low voltage energy of electric car, realize two
Security function is reasonably allocated to the associated components in low voltage energy management system, reduces the security level to DCDC by grade protection
It is required that having achieved the effect that reduce cost and optimization system design.
Further embodiment of the present invention also proposed a kind of overvoltage protective system of electric car.
Fig. 2 is the structural block diagram of the overvoltage protective system of electric car according to an embodiment of the invention.Such as Fig. 2 institute
Show, the overvoltage protective system 100 of the electric car includes: power battery 110, current transfer device 120 and entire car controller
130。
Wherein, current transfer device 120 turns low-voltage direct, the high pressure of current transfer device 120 for carrying out high voltage direct current
Input terminal is connected with power battery 110, and the low-voltage output of current transfer device 120 passes through relay and low voltage equipment phase
Even.
Entire car controller 130 (i.e. VCU) has monitoring side and control terminal, the low pressure of monitoring side and current transfer device 120
Output end is connected, and to monitor the state of low-voltage output, control terminal is connected with relay, and entire car controller 130 is used in electric current
When the abnormal state of the low-voltage output of conversion equipment 120, control relay is disconnected to cut off the low pressure of current transfer device 120
The output of output end.Specifically, such as control relay is disconnected to cut off the low-voltage output and low pressure of current transfer device 120
Connection between electrical equipment, to cut off the low pressure output of current transfer device 120.
In one embodiment of the invention, the low-voltage output of 130 monitoring current conversion equipment 120 of entire car controller
State specifically includes: the voltage of the low-voltage output output of 130 monitoring current conversion equipment 120 of entire car controller.
In one embodiment of the invention, when the abnormal state of the low-voltage output of current transfer device 120, vehicle
Controller 130 cuts off the output of the low-voltage output of current transfer device 120, and specifically include: entire car controller 130 judges electric current
Whether the voltage of the low-voltage output output of conversion equipment 120 is greater than predetermined voltage (judging whether over-voltage), and turns in electric current
When the voltage of the low-voltage output output of changing device 120 is greater than predetermined voltage (i.e. over-voltage), control relay is disconnected, to cut off electricity
The output of the low-voltage output of stream conversion device 120.
In one embodiment of the invention, entire car controller 130 is also used to whether monitoring current conversion equipment 120 occurs
Failure, and when current transfer device 120 breaks down, start the state of the low-voltage output of monitoring current conversion equipment 120.
To sum up, the overvoltage protective system of the electric car of the embodiment of the present invention, using two-stage low pressure monitoring strategies, the first order
Low pressure output monitoring is carried out by current transfer device 120 itself, if discovery low pressure output overvoltage, cutoff low output；The
Second level is monitored the output of the low pressure of current transfer device 120 by entire car controller 130, when current transfer device 120 the
It when level-one monitoring failure and monitors to carry out ultimate protection when over-voltage, disconnecting relay by entire car controller 130 ensures to cut off
The low pressure of current transfer device 120 exports, and then ensure that the safety of low-pressure system, reduces the peace of current transfer device 120
Congruent grade, and do not increase any hardware, it is at low cost.
It should be noted that the specific implementation of the overvoltage protective system of the electric car of the embodiment of the present invention and this hair
The specific implementation of the over-voltage protection method of the electric car of bright embodiment is similar, specifically refers to the description of method part,
In order to reduce redundancy, details are not described herein again.
The overvoltage protective system of electric car according to an embodiment of the present invention is turned by entire car controller real-time monitoring electric current
The state of the low-voltage output of changing device, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC,
And then guarantee associated components safety and traffic safety, and carried out second level management for the low voltage energy of electric car, realize two
Security function is reasonably allocated to the associated components in low voltage energy management system, reduces the security level to DCDC by grade protection
It is required that having achieved the effect that reduce cost and optimization system design.
Further embodiment of the present invention also proposed a kind of electric car.The electric car includes such as the present invention above-mentioned
The overvoltage protective system of electric car described in one embodiment of anticipating.
Electric car according to an embodiment of the present invention, the low pressure by entire car controller real-time monitoring current transfer device are defeated
The state of outlet, when over-voltage exception occurs, the directly low pressure output of cutting current transfer device DCDC, and then guarantee dependent part
Part safety and traffic safety, and second level management has been carried out for the low voltage energy of electric car, second class protection is realized, by safe function
The associated components that can be reasonably allocated in low voltage energy management system reduce the security level requirement to DCDC, have reached reduction
The effect of cost and optimization system design.
In addition, electric car according to an embodiment of the present invention other compositions and effect for this field ordinary skill
All be for personnel it is known, in order to reduce redundancy, be not repeated herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (10)
1. a kind of over-voltage protection method of electric car, which comprises the following steps:
The state of the low-voltage output of entire car controller monitoring current conversion equipment；
When the abnormal state of the low-voltage output of the current transfer device, the entire car controller cuts off the electric current conversion
The output of the low-voltage output of device.
2. the over-voltage protection method of electric car according to claim 1, which is characterized in that the entire car controller monitoring
The state of the low-voltage output of current transfer device, comprising: monitor the electricity of the low-voltage output output of the current transfer device
Pressure.
3. the over-voltage protection method of electric car according to claim 2, which is characterized in that described when the electric current is converted
When the abnormal state of the low-voltage output of device, the entire car controller cuts off the low-voltage output of the current transfer device
Output, comprising:
Judge whether the voltage of the low-voltage output output of the current transfer device is greater than predetermined voltage；
If it is, cutting off the output of the low-voltage output of the current transfer device.
4. the over-voltage protection method of electric car according to claim 1-3, which is characterized in that the cutting institute
State the output of the low-voltage output of current transfer device, comprising:
The vehicle control unit controls relay disconnects, wherein the low pressure that the relay is located at the current transfer device is defeated
Between outlet and the low voltage equipment of vehicle.
5. the over-voltage protection method of electric car according to claim 3, which is characterized in that further include:
The entire car controller monitors whether the current transfer device breaks down；
When the current transfer device breaks down, start the state for monitoring the low-voltage output of the current transfer device.
6. a kind of overvoltage protective system of electric car characterized by comprising
Power battery；
Turn the current transfer device of low-voltage direct, the high voltage input terminal of the current transfer device and institute for carrying out high voltage direct current
It states power battery to be connected, the low-voltage output of the current transfer device is connected by relay with low voltage equipment；
Entire car controller, the entire car controller have monitoring side and control terminal, the monitoring side and the current transfer device
Low-voltage output be connected, to monitor the state of the low-voltage output, the control terminal is connected with relay, in the electricity
When the abnormal state of the low-voltage output of stream conversion device, controls the relay and disconnect to cut off the current transfer device
The output of low-voltage output.
7. the overvoltage protective system of electric car according to claim 6, which is characterized in that the entire car controller is used for
Monitor the voltage of the low-voltage output output of the current transfer device.
8. the overvoltage protective system of electric car according to claim 7, which is characterized in that the entire car controller is used for
Judge whether the voltage of the low-voltage output output of the current transfer device is greater than predetermined voltage, when the current transfer device
The voltage of low-voltage output output when being greater than the predetermined voltage, control the relay and disconnect to cut off the electric current conversion
The output of the low-voltage output of device.
9. the overvoltage protective system of electric car according to claim 8, which is characterized in that the entire car controller is also used
Whether break down in the monitoring current transfer device, and when the current transfer device breaks down, starts to monitor institute
State the state of the low-voltage output of current transfer device.
10. a kind of electric car characterized by comprising according to the over-voltage of the described in any item electric cars of claim 6-9
Protection system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811033933.5A CN109278559A (en) | 2018-09-05 | 2018-09-05 | Over-voltage protection method, system and the electric car of electric car |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811033933.5A CN109278559A (en) | 2018-09-05 | 2018-09-05 | Over-voltage protection method, system and the electric car of electric car |
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Family
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