CN109830940A - A kind of circuit protection device and method for electric car - Google Patents
A kind of circuit protection device and method for electric car Download PDFInfo
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- CN109830940A CN109830940A CN201711173626.2A CN201711173626A CN109830940A CN 109830940 A CN109830940 A CN 109830940A CN 201711173626 A CN201711173626 A CN 201711173626A CN 109830940 A CN109830940 A CN 109830940A
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- contactor
- state
- power battery
- assembly main
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Abstract
The invention discloses a kind of circuit protection devices and method for electric car.Described device includes: power battery contactor state acquisition unit, is configured to the switch state of acquisition power battery contactor；Assembly main contactor state acquisition unit is configured to the switch state of acquisition assembly main contactor；Assembly main contactor state lock cell is configured to lock the assembly main contactor when the power battery contactor disconnects to be off-state.The apparatus according to the invention can be associated locking to electric automobile power battery contactor and assembly contactor, so that the driving habit of the conventional fuel oil car of driver be avoided to lead to pure electric automobile operation irregularity；Compared to the prior art, the device of the invention structure is simple, is easily achieved, and can greatly improve the safety and stability of pure electric automobile, has very high practical value and promotional value.
Description
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of circuit protection device and side for electric car
Method.
Background technique
With the continuous development of electric vehicle engineering, electric car is increasingly used in the daily production and living of the mankind
In.
Since conventional fuel oil car is still in main status, for unified vehicle structure, unified drive manner, in the prior art
In, many control modes setting of pure electric automobile is referring to conventional fuel oil car.For example, the key signal mould of pure electric automobile
Quasi- conventional fuel oil car is similarly divided into OFF grades, ACC low pressure shelves, ON starting shelves.
At the same time, since the driving habit of driver is got up by conventional fuel oil car culture mostly, for pure electric vehicle vapour
Such emerging product of vehicle, part driver drive still according to the driving habit of fuel vehicle.Especially, in driving procedure,
Quickly switch to ON grades after switching to ACC grades by ON grades again.
But although pure electric automobile key signal simulates conventional fuel oil car, work essence is different, tradition combustion
The ON shelves signal of oily vehicle be allow engine start, and ON grade signals of pure electric automobile be allow the given excitation signal of electric machine controller into
And motor is allowed to work according to set revolving speed and torque.This result in the driving habit using conventional fuel oil car to pure electric automobile into
Row drives, it is easy to lead to pure electric automobile operation irregularity.
Summary of the invention
The present invention provides a kind of circuit protection device for electric car, described device includes:
Power battery contactor state acquisition unit is configured to the switch state of acquisition power battery contactor；
Assembly main contactor state acquisition unit is configured to the switch state of acquisition assembly main contactor；
Assembly main contactor state lock cell is configured to lock when the power battery contactor disconnects described total
It is off-state at main contactor.
In one embodiment, described device further include:
Power battery contactor lock cell is configured to lock the power before the assembly main contactor disconnects
Battery contactor is off-state.
In one embodiment, described device further include:
Current detecting unit is configured to real time monitoring main circuit current；
Command signal blocking unit is configured to the cutting when the monitoring result of the current detecting unit reaches early warning value
ACC grades of electric car are arrived ON grades of signal instructions.
In one embodiment, described device further include:
It is depressured protection location, is mounted on major loop anode and/or negative terminal, is configured to generate when the major loop positive and negative terminal
Reduction regulation is carried out when abnormal pressure difference.
In one embodiment, the decompression protection location uses varistor.
The invention also provides a kind of circuit protection methods for electric car, which comprises
When the power battery contactor of electric car disconnects, the assembly main contactor of locking electric car is off-state.
In one embodiment, the method also includes:
It is off-state that the power battery contactor is locked before assembly main contactor disconnection.
In one embodiment, the method also includes:
It monitors main circuit current in real time, electric car ACC grades to ON grades signal is cut off when monitoring result reaches early warning value
Instruction.
In one embodiment, the method also includes:
Voltage-reduction protection device is installed in major loop anode and/or negative terminal, when the major loop positive and negative terminal generates abnormal pressure difference
Shi Jinhang reduction regulation.
In one embodiment, varistor is installed in major loop anode and/or negative terminal.
The apparatus according to the invention can be associated lock to electric automobile power battery contactor and assembly contactor
It is fixed, so that the driving habit of the conventional fuel oil car of driver be avoided to lead to pure electric automobile operation irregularity；Compared to the prior art, originally
The apparatus structure of invention is simple, is easily achieved, and can greatly improve the safety and stability of pure electric automobile, has very high
Practical value and promotional value.
Other feature or advantage of the invention will illustrate in the following description.Also, Partial Feature of the invention or
Advantage will be become apparent by specification, or be appreciated that by implementing the present invention.The purpose of the present invention and part
Advantage can be realized or be obtained by step specifically noted in the specification, claims and drawings.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings:
Fig. 1 and Fig. 2 is pure electric automobile the Analysis of Abnormal State figure；
Fig. 3 is pure electric automobile electric control system schematic diagram；
Fig. 4~Fig. 5 is the apparatus structure block diagram of different embodiments according to the present invention；
Fig. 6 is the device part-structure block diagram of different embodiments according to the present invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, implementation personnel of the invention whereby
Can fully understand that how the invention applies technical means to solve technical problems, and reach technical effect realization process and according to
The present invention is embodied according to above-mentioned realization process.As long as each embodiment it should be noted that do not constitute conflict, in the present invention
And each feature in each embodiment can be combined with each other, be formed by technical solution protection scope of the present invention it
It is interior.
In automobile industry, since conventional fuel oil car is still in main status, for unified vehicle structure, unified driving side
Formula, in the prior art, many control modes setting of pure electric automobile is referring to conventional fuel oil car.For example, pure electric vehicle vapour
The key signal of vehicle simulates conventional fuel oil car, is similarly divided into OFF grades, ACC low pressure shelves, ON starting shelves.
At the same time, since the driving habit of driver is got up by conventional fuel oil car culture mostly, for pure electric vehicle vapour
Such emerging product of vehicle, part driver drive still according to the driving habit of fuel vehicle.Especially, in driving procedure,
Quickly switch to ON grades after switching to ACC grades by ON grades again.
But although pure electric automobile key signal simulates conventional fuel oil car, work essence is different, tradition combustion
The ON shelves signal of oily vehicle be allow engine start, and ON grade signals of pure electric automobile be allow the given excitation signal of electric machine controller into
And motor is allowed to work according to set revolving speed and torque.This result in the driving habit using conventional fuel oil car to pure electric automobile into
Row drives, it is easy to lead to pure electric automobile operation irregularity.
To solve the above problems, the present invention analyzes the pure electric automobile control system under the driving habit of conventional fuel oil car first
The workflow of system.
In practical application scene, pure electric automobile operation irregularity tends to occur at the driving of driver's traditionally fuel vehicle
Switch to after automobile key is switched to ACC grades by ON grades by habit and quickly ON grades.In one embodiment, to pure electric vehicle vapour under the state
The system mode of vehicle is monitored.
Specifically, 10 high temperature wires of DC/AC fuse are replaced, current tester clips to a conducting wire therein
On；The positive and negative DC/AC bus that connects respectively of high pressure differential probe just bears (rear end voltage) with power supply, and low pressure probe connects assembly main contactor
Control signal wire.Occur due to only quickly just having high current by ON → ACC → ON gear, so here just for this process
It is analyzed, tests each signal waveform.Current waveform data is all the value on solid conductor, and actual value should multiply on this basis
With 10.
As shown in Figure 1, Fig. 1 left figure is ON → ACC → ON process waveform, A is terminal voltage signal after assembly, and B is electric current letter
Number, C is main contactor control signal.Dotted box portion is abnormal voltage/electric current appearance point, and right figure is putting for dotted line frame inner part
Waveform after big.
Key is disconnected by battery main contactor after ON → ACC, assembly power down, circuit electricity where assembly main contactor will judge
Whether stream is less than 5A, if it is less than then disconnecting；Waveform can be seen that assembly main contactor is disconnected not yet at this time after being amplified by right figure
It opens, but since battery is disconnected so rear end voltage can decline therewith.Before the disconnection of assembly main contactor, key is again from ACC
→ ON, rear end voltage falls below 200V or so at this time, and voltage has a mutation, main since pre-charge contactor is in an off state
Contactor is in closure, so entire circuit is not pre-charged, is equivalent to and directly adds the voltage that one has been mutated 130V or so
Battery just with capacitor in assembly just between, it is close that moment produces a pulse current-loop current where fuse
100A。
As shown in Fig. 2, Fig. 2 left figure is the quick ON → ACC of complete forward gear → ON process waveform.Fig. 2 right figure is complete
The quick ON → ACC of neutral gear → ON process waveform.It can be seen that left figure mutation voltage is about 130V, right figure mutation voltage is general
For 50V, resulting pulse current is respectively 10A and 4A or so (solid wire).Mutation voltage is bigger, and is produced from circuit where insurance
Raw pulse current is bigger.
During the quick ON → ACC of key → ON, battery management system (BATTERY MANAGEMENT when ON → ACC
SYSTEM, BMS) main contactor will disconnect, and in order to protect battery, BMS system can allow main contactor to be first closed then when ACC → ON
It disconnects at once, this time general 200ms carries out the self-test of 3-5s again later, if the BMS that do not break down will be closed master
Contactor.
Circuit and charging and discharging circuit structure diagram are as shown in Figure 3 where power battery, fuse (FUSE).ON→ACC
Very in short-term, BMS main contactor K3 is disconnected → ON time interval when ON → ACC, if main contactor K1 is disconnected not yet in assembly,
Key has got to ON gear again, then contactor can be closed 200ms and disconnect again in BMS.Assuming that DC/AC Support Capacitor has put one at this time
Divide electricity, voltage Uc.At this moment pre-charge contactor K2 is in an off state, then cell voltage is directly over the circuit K1 and is added in
Circuit both ends where R2 and fuse FUSE, generate the pressure difference of a △ U=Us-Uc, capacitor phase for this mutation voltage
When in short circuit, then circuit where capacitor C can generate a very big electric current.△ U is bigger, and △ I is bigger, when △ I is more than regulation
Value, which then insures FUSE, to burn；Or △ I is close to specified value, but is not above, after repeat impact, insurance also can be one
It is a be lower than a safety value in the case where burn.
Abnormality principle analysis based on above-mentioned pure electric automobile burns insurance and is both present in power-on and power-off link.Therefore, originally
Invention proposes a kind of circuit protection method for electric car, avoids burning the measure insured being to realize main contact in assembly
The contactor interlocking of device and power battery.
Specifically, in one embodiment, method include: locked when the power battery contactor of electric car disconnects it is electronic
The assembly main contactor of automobile is off-state.
Further, in one embodiment, method further include: locking power battery connects before the disconnection of assembly main contactor
Tentaculum is off-state.
It ensures that in this way and powers on away preliminary filling electrical circuit again.
Further, in one embodiment, method further include: real time monitoring main circuit current, when monitoring result reaches pre-
Electric car ACC grades to ON grades signal instruction is cut off when alert value.
Specifically, in one embodiment, increasing current sensor in major loop anode, monitoring is implemented current signal and informed
Entire car controller cuts off ACC grades of driver to ON grades of signal instructions if electric current moment reaches early warning value, and timely driver has ACC grades
It is instructed to ON grades of quick actings, entire car controller is also not responding to its instruction, prevents insurance from burning out and guarantees that vehicle operates normally.
Further, in one embodiment, method further include: in major loop anode and/or negative terminal installation decompression protection dress
It sets, carries out reduction regulation when major loop positive and negative terminal generates abnormal pressure difference.
Specifically, in one embodiment, installing varistor in major loop anode and/or negative terminal, switching to ACC grades at ON grades
When generating larger pressure difference when quickly adjusting back ON again afterwards, varistor voltage declines rapidly the devices such as protection rear end fuse and exempts from
It is injured by because of electric current caused by pressure difference.
Based on method of the invention, the invention also provides a kind of circuit protection devices for electric car.Such as Fig. 4 institute
Show, device includes:
Power battery contactor state acquisition unit 410 is configured to the switch shape of acquisition power battery contactor 401
State；
Assembly main contactor state acquisition unit 420 is configured to the switch state of acquisition assembly main contactor 402；
Assembly main contactor state lock cell 430 is configured to the locked assembly when power battery contactor 401 disconnects
Main contactor 402 is off-state.
Further, as shown in figure 5, in one embodiment, device further include:
Power battery contactor lock cell 540 is configured to lock power electric before assembly main contactor 502 disconnects
Pond contactor 501 is off-state.
Further, as shown in fig. 6, in one embodiment, device further include:
Current detecting unit 650 is configured to real time monitoring main circuit current；
Command signal blocking unit 660 is configured to cut when the monitoring result of current detecting unit 650 reaches early warning value
Electrical automobile ACC grades to ON grades signal instruction is powered off, specifically, outputting a control signal to entire car controller 603.
Further, in one embodiment, device further include: decompression protection location, be mounted on major loop anode and/or
Negative terminal is configured to carry out reduction regulation when major loop positive and negative terminal generates abnormal pressure difference.
Specifically, in one embodiment, decompression protection location uses varistor.After switching to ACC grades at ON grades quickly again
Secondary when generating larger pressure difference when adjusting back ON, varistor voltage, which declines rapidly, protects the devices such as rear end fuse from because of pressure difference
Caused electric current injury.
The apparatus according to the invention can be associated lock to electric automobile power battery contactor and assembly contactor
It is fixed, so that the driving habit of the conventional fuel oil car of driver be avoided to lead to pure electric automobile operation irregularity；Compared to the prior art, originally
The apparatus structure of invention is simple, is easily achieved, and can greatly improve the safety and stability of pure electric automobile, has very high
Practical value and promotional value.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Method of the present invention can also have other various embodiments.Without departing substantially from
In the case where essence of the present invention, those skilled in the art make various corresponding changes or change in accordance with the present invention
Shape, but these corresponding changes or deformation all should belong to scope of protection of the claims of the invention.
Claims (10)
1. a kind of circuit protection device for electric car, which is characterized in that described device includes:
Power battery contactor state acquisition unit is configured to the switch state of acquisition power battery contactor；
Assembly main contactor state acquisition unit is configured to the switch state of acquisition assembly main contactor；
Assembly main contactor state lock cell is configured to lock the assembly master when the power battery contactor disconnects
Contactor is off-state.
2. the apparatus according to claim 1, which is characterized in that described device further include:
Power battery contactor lock cell is configured to lock the power battery before the assembly main contactor disconnects
Contactor is off-state.
3. device according to claim 1 or 2, which is characterized in that described device further include:
Current detecting unit is configured to real time monitoring main circuit current；
Command signal blocking unit is configured to cut off when the monitoring result of the current detecting unit reaches early warning value electronic
ACC grades of automobile are arrived ON grades of signal instructions.
4. device described in any one of claim 1 to 3, which is characterized in that described device further include:
It is depressured protection location, is mounted on major loop anode and/or negative terminal, is configured to generate exception when the major loop positive and negative terminal
Reduction regulation is carried out when pressure difference.
5. device according to claim 4, which is characterized in that the decompression protection location uses varistor.
6. a kind of circuit protection method for electric car, which is characterized in that the described method includes:
When the power battery contactor of electric car disconnects, the assembly main contactor of locking electric car is off-state.
7. according to the method described in claim 6, it is characterized in that, the method also includes:
It is off-state that the power battery contactor is locked before assembly main contactor disconnection.
8. method according to claim 6 or 7, which is characterized in that the method also includes:
It monitors main circuit current in real time, electric car ACC grades to ON grades signal instruction is cut off when monitoring result reaches early warning value.
9. the method according to any one of claim 6~8, which is characterized in that the method also includes:
Voltage-reduction protection device is installed in major loop anode and/or negative terminal, when the major loop positive and negative terminal generates abnormal pressure difference into
Row reduction regulation.
10. according to the method described in claim 9, it is characterized in that, installing varistor in major loop anode and/or negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173626.2A CN109830940B (en) | 2017-11-22 | 2017-11-22 | Circuit protection device and method for electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173626.2A CN109830940B (en) | 2017-11-22 | 2017-11-22 | Circuit protection device and method for electric automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109830940A true CN109830940A (en) | 2019-05-31 |
| CN109830940B CN109830940B (en) | 2020-08-25 |
Family
ID=66858131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711173626.2A Active CN109830940B (en) | 2017-11-22 | 2017-11-22 | Circuit protection device and method for electric automobile |
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| CN (1) | CN109830940B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111107132A (en) * | 2019-11-08 | 2020-05-05 | 上海钧正网络科技有限公司 | Early warning method, system, device, equipment and storage medium |
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|---|---|---|---|---|
| CN1966304A (en) * | 2006-11-17 | 2007-05-23 | 朱明忠 | Electric automobile control and charge protection device |
| CN101162836A (en) * | 2007-11-02 | 2008-04-16 | 奇瑞汽车有限公司 | High-pressure security protection of electrokinetic cell system |
| CN105984457A (en) * | 2015-03-17 | 2016-10-05 | 通用汽车环球科技运作有限责任公司 | Method and system for control of contactor |
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| CN111107132A (en) * | 2019-11-08 | 2020-05-05 | 上海钧正网络科技有限公司 | Early warning method, system, device, equipment and storage medium |
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| CN109830940B (en) | 2020-08-25 |
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