CN105004988B - A kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system - Google Patents
A kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system Download PDFInfo
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- CN105004988B CN105004988B CN201510371765.0A CN201510371765A CN105004988B CN 105004988 B CN105004988 B CN 105004988B CN 201510371765 A CN201510371765 A CN 201510371765A CN 105004988 B CN105004988 B CN 105004988B
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Abstract
The invention discloses a kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system, this method to include：Power battery management system will be switched off relay instruction and send to main relay and pre-charge-relay, control main relay and pre-charge-relay to disconnect；Power battery management system obtains electrokinetic cell total voltage UABAnd electrokinetic cell total current I；Power battery management system receives the electrokinetic cell output total voltage U for being gathered and being sent by high-voltage load systemCD；Power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd whether electrokinetic cell total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay.This method is realized and avoids increasing extra fault diagnosis circuit, reduces the cost of fault diagnosis.
Description
Technical field
It is high more particularly to a kind of electrokinetic cell system the present invention relates to new-energy automobile power battery systems technology field
Potential relay method for diagnosing faults and related system.
Background technology
The electrokinetic cell system of new-energy automobile includes electrokinetic cell, current sensor, main relay, precharge relay
Device, pre-charge resistance and power battery management system, main relay are connected with electrokinetic cell.High-voltage load system has a great Rong
The electric capacity of amount, the electric capacity of the Large Copacity of high-voltage load system are connected with electrokinetic cell and main relay.Because in use,
If direct closed high main relay, occurs transient high-current, to the high-voltage relay and height in electrokinetic cell system
The electric capacity of pressure load system, which impacts, to be caused to damage, to avoid the phenomenon from occurring, so prior art is in main relay two
One pre-charge circuit of Parallel Design, i.e. pre-charge-relay and pre-charge resistance are held, pre-charge circuit effect is to close
Line precharge is entered to the electric capacity of high-voltage load system before high pressure main relay.
Main relay and pre-charge-relay are the high-voltage relay of electrokinetic cell system, however, main relay and pre-
This kind of high-voltage relay of charge relay is rushed in vehicle running by high temperature, vibration, high current cut-out impact, overvoltage
Hitting etc. influences, and its performance and life-span can decline, or even damage, the failure that high-voltage relay most often occurs be mechanical end it is normally closed therefore
Barrier, the mechanical normally closed failure in end are still to be not turned off after high-voltage relay receives disconnection relay instruction, are still always maintained at
The state of closure.
In failure diagnostic process of the prior art, fault diagnosis typically is carried out just for high pressure main relay, and pass through
The fault diagnosis circuit of stand-alone development is set at main relay both ends, fault diagnosis, such diagnostic system are carried out to main relay
Cost it is all higher.And increased functional module can not carry out fault diagnosis to pre-charge-relay, simply to main relay
Device is diagnosed.
The content of the invention
It is an object of the invention to provide a kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system, with
Realization avoids increasing extra fault diagnosis circuit, reduces the purpose of the cost of fault diagnosis.
In order to solve the above technical problems, the present invention provides a kind of electrokinetic cell system high-voltage relay method for diagnosing faults,
This method includes：
Power battery management system will be switched off relay instruction and send to main relay and pre-charge-relay, described in control
Main relay and the pre-charge-relay disconnect；
The power battery management system obtains electrokinetic cell total voltage UABAnd electrokinetic cell total current I；
The power battery management system receives the electrokinetic cell output total voltage for being gathered and being sent by high-voltage load system
UCD；
The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the main relay；
Wherein, first preparatory condition includes：The electrokinetic cell total voltage UABTotal electricity is exported with the electrokinetic cell
Press UCDIt is equal, the electrokinetic cell total voltage UABIt is not zero, and the electrokinetic cell total current I is more than zero.
Preferably, methods described also includes：
The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the second preparatory condition, if so, determining that the normally closed event in mechanical end occurs for the pre-charge-relay
Barrier；
Wherein, second preparatory condition includes：The electrokinetic cell total voltage UABIt is total more than electrokinetic cell output
Voltage UCD, the electrokinetic cell output total voltage UCDIt is not zero, and the electrokinetic cell total current I is more than zero.
Preferably, methods described also includes：
The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the 3rd preparatory condition, if so, determining that the main relay and the pre-charge-relay are equal
It is normal to disconnect；
Wherein, the 3rd preparatory condition includes：The electrokinetic cell total voltage UABIt is total more than electrokinetic cell output
Voltage UCD, the electrokinetic cell output total voltage UCDEqual to zero, and the electrokinetic cell total current I is equal to zero.
The present invention also provides a kind of power battery management system, and the power battery management system includes：
Relay control module, sent for will be switched off relay instruction to main relay and pre-charge-relay, control
The main relay and the pre-charge-relay disconnect；
Voltage acquisition module, for obtaining electrokinetic cell total voltage UAB；
Current acquisition module, for obtaining electrokinetic cell total current I；
Communication module, for receiving the electrokinetic cell for being gathered and being sent by high-voltage load system output total voltage UCD；
First judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the main relay；
Wherein, first preparatory condition includes：The electrokinetic cell total voltage UABTotal electricity is exported with the electrokinetic cell
Press UCDIt is equal, the electrokinetic cell total voltage UABIt is not zero, and the electrokinetic cell total current I is more than zero.
Preferably, the power battery management system also includes：
Second judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the pre-charge-relay；
Wherein, second preparatory condition includes：The electrokinetic cell total voltage UABIt is total more than electrokinetic cell output
Voltage UCD, the electrokinetic cell output total voltage UCDIt is not zero, and the electrokinetic cell total current I is more than zero.
Preferably, the power battery management system also includes：
3rd judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the 3rd preparatory condition, if so, determining that the main relay and the pre-charge-relay are normal
Disconnect；
Wherein, the 3rd preparatory condition includes：The electrokinetic cell total voltage UABIt is total more than electrokinetic cell output
Voltage UCD, the electrokinetic cell output total voltage UCDEqual to zero, and the electrokinetic cell total current I is equal to zero.
A kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system provided by the present invention, power electric
Pond management system will be switched off relay instruction and send to main relay and pre-charge-relay, control main relay and precharge after
Electrical equipment disconnects, i.e., main relay and pre-charge-relay should it is already off in the case of, power battery management system obtains
Electrokinetic cell total voltage and electrokinetic cell total current, power battery management system receive what is gathered and sent by high-voltage load system
Electrokinetic cell exports total voltage, and power battery management system judges electrokinetic cell total voltage, electrokinetic cell output total voltage
And whether electrokinetic cell total current meets the first preparatory condition, if so, the mechanical normally closed failure in end of main relay generation is determined, first
Preparatory condition includes：Electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is equal, electrokinetic cell total voltage UABIt is not
Zero, and electrokinetic cell total current I is more than zero.It can be seen that directly obtaining electrokinetic cell total voltage and electrokinetic cell total current, and pass through
It is all the existing function of power battery management system that high-voltage load system, which obtains electrokinetic cell output total voltage, electrokinetic cell management
System can export total voltage these three parameters to relay according to electrokinetic cell total voltage, electrokinetic cell total current and electrokinetic cell
Device failure carries out diagnositc decision, so directly carries out the normally closed fault diagnosis in relay machinery end using power battery management system,
Extra fault diagnosis circuit need not be increased, reduce the cost of fault diagnosis.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
A kind of flow for electrokinetic cell system high-voltage relay method for diagnosing faults that Fig. 1 is provided by the embodiment of the present invention
Figure；
The principle that fault diagnosis is carried out to electrokinetic cell system high-voltage relay that Fig. 2 is provided by the embodiment of the present invention is shown
It is intended to；
A kind of structural representation for power battery management system that Fig. 3 is provided by the embodiment of the present invention.
Embodiment
The core of the present invention is to provide a kind of electrokinetic cell system high-voltage relay method for diagnosing faults and related system, with
Realization avoids increasing extra fault diagnosis circuit, reduces the cost of fault diagnosis.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, and combines Fig. 2, a kind of electrokinetic cell system high-voltage relay that Fig. 1 is provided by the embodiment of the present invention
The flow chart of device method for diagnosing faults, Fig. 2 are carried out by what the embodiment of the present invention provided to electrokinetic cell system high-voltage relay
The principle schematic of fault diagnosis.
Based on Fig. 2, electrokinetic cell system includes electrokinetic cell 11, current sensor 12, main relay 13, precharge relay
Device 14, pre-charge resistance 15 and power battery management system 16.Two port side a and bs in power battery management system 16
It is connected respectively with the positive level and negative pole of electrokinetic cell 11, power battery management system 16 can obtain the total of the both ends of electrokinetic cell 11
Voltage is electrokinetic cell total voltage UAB.The company that current sensor 12 is accessed between the positive pole of electrokinetic cell 11 and main relay 13
In link, the total current i.e. electrokinetic cell total current I of the output of electrokinetic cell 11 can be obtained.Power battery management system 16 with
The output end of current sensor 12 is connected, and it is total that power battery management system 16 can obtain electrokinetic cell by current sensor 12
Electric current I.The mechanical end 21 of main relay 13 respectively with the electric capacity 18 of the positive level of electrokinetic cell 11 and high-voltage load system 17 just
Level is connected, and the control terminal of main relay 13 is that coil 22 is connected with power battery management system 18 and power supply VCC respectively, precharge
The mechanical end 31 of relay 14 is connected with the positive level and pre-charge resistance 15 of electrokinetic cell 11 respectively, the control of pre-charge-relay 13
End 32 processed is connected with power battery management system 16 and power supply VCC respectively.The negative pole of the electric capacity 18 of high-voltage load system 17 is with moving
The negative pole of power battery 11 is connected, and the positive pole of the electric capacity 18 of high-voltage load system 17 is connected with main relay 13, high-voltage load system
The voltage U at the both ends of 17 electric capacity 18CDIt is the total voltage that electrokinetic cell 11 exports, i.e. electrokinetic cell exports total voltage.High pressure is born
Loading system 17 can collect the voltage U at the both ends of electric capacity 18CD, i.e. electrokinetic cell output total voltage UCD, and electrokinetic cell is exported
Total voltage UCDSend to power battery management system 16.The annexation of all parts in the electrokinetic cell system shown in Fig. 2
And high-voltage load system and prior art are consistent, but the electrokinetic cell management system in the electrokinetic cell system of the present invention
System can carry out fault diagnosis to high-voltage relay, and power battery management system of the prior art is to enter in itself
Row fault diagnosis, itself is merely able to obtain electrokinetic cell total voltage and electrokinetic cell total current, and passes through high-voltage load system
These parameter informations of system acquisition electrokinetic cell output total voltage, the function of not diagnosing.
Based on Fig. 1, with reference to Fig. 2, Fig. 1 provides a kind of electrokinetic cell system high-voltage relay method for diagnosing faults, this method
Including：
Step S101：Power battery management system will be switched off relay instruction and send to main relay and precharge relay
Device, main relay and pre-charge-relay is controlled to disconnect；
Wherein, power battery management system will be switched off relay instruction transmission to main relay and pre-charge-relay, control
Main relay processed and pre-charge-relay disconnect, then show that main relay and pre-charge-relay should be in already off feelings
Under condition.If normally closed failure does not occur for main relay, main relay disconnects, if normally closed failure, main relay occur for main relay
Closure；If normally closed failure does not occur for pre-charge-relay；Pre-charge-relay disconnects, if normally closed event occurs for pre-charge-relay
Barrier, pre-charge-relay closure.
Step S102：Power battery management system obtains electrokinetic cell total voltage UABAnd electrokinetic cell total current I；
Step S103：It is total that power battery management system receives the electrokinetic cell output for being gathered and being sent by high-voltage load system
Voltage UCD；
Step S104：Power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay；
Wherein, the first preparatory condition includes：Electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is equal, move
Power battery total voltage UABIt is not zero, and electrokinetic cell total current I is more than zero.That is UAB=UCD、UAB≠ 0, I ＞ 0.
Specifically, by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is compared, judges electrokinetic cell
Total voltage UABWith electrokinetic cell output total voltage UCDIt is whether equal；If electrokinetic cell total voltage UABTotal electricity is exported with electrokinetic cell
Press UCDIt is equal, continue to judge electrokinetic cell total voltage UABWhether it is zero；If electrokinetic cell total voltage UABIt is not zero, continues to judge
Whether electrokinetic cell total current I is more than zero；If electrokinetic cell total current I is more than zero, it is normally closed to determine that mechanical end occurs for main relay
Failure.
Because after the normally closed failure in the mechanical end of main relay generation, the mechanical end of main relay is constantly in closure state,
It is not turned off, still will not be disconnected even if receiving and disconnecting relay instruction, be in closure state, pre-charge-relay connects
Receiving can disconnect after disconnecting relay instruction.Under the normally closed malfunction of main relay, electrokinetic cell total current I directly passes through
Main relay reaches high-voltage load system, and pre-charge-relay disconnected, electrokinetic cell total current I will not produce be diverted through it is pre-
Charge relay, then the voltage at main relay both ends is zero, then electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCD
It is equal, and electrokinetic cell total voltage UABBe existing with electrokinetic cell total current I, have numerical value, be not zero, i.e., it is dynamic
Power battery total voltage UABIt is not zero, electrokinetic cell total current I is more than zero.So power battery management system can be according to getting
Electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell total current I is compared judgement, when this three
When individual parameter meets the first preparatory condition, it becomes possible to determine that the normally closed failure in mechanical end has occurred for main relay.
A kind of electrokinetic cell system high-voltage relay method for diagnosing faults provided by the present invention, power battery management system
It will be switched off relay instruction to send to main relay and pre-charge-relay, control main relay and pre-charge-relay to disconnect,
I.e. main relay and pre-charge-relay should it is already off in the case of, it is total that power battery management system obtains electrokinetic cell
Voltage and electrokinetic cell total current, receive the electrokinetic cell output total voltage for being gathered by high-voltage load system and being sent, Er Qiedong
Power battery management system judges whether electrokinetic cell total voltage, electrokinetic cell output total voltage and electrokinetic cell total current meet the
One preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay, the first preparatory condition includes：Electrokinetic cell is always electric
Press UABWith electrokinetic cell output total voltage UCDIt is equal, electrokinetic cell total voltage UABIt is not zero, and electrokinetic cell total current I is more than
Zero.It can be seen that directly obtaining electrokinetic cell total voltage and electrokinetic cell total current, and electrokinetic cell is obtained by high-voltage load system
It is all the existing function of power battery management system to export total voltage, and power battery management system can be always electric according to electrokinetic cell
Pressure, electrokinetic cell total current and electrokinetic cell output these three parameters of total voltage carry out diagnositc decision to relay failure, so
The normally closed fault diagnosis in relay machinery end directly is carried out using power battery management system, without increasing extra fault diagnosis electricity
Road, reduce the cost of fault diagnosis.
Based on above-described embodiment, optionally, methods described also includes：
Step S21：Power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for pre-charge-relay；
Wherein, the second preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, power
Battery output total voltage UCDIt is not zero, and electrokinetic cell total current I is more than zero.That is UAB＞ UCD、UCD≠ 0, I ＞ 0.
Specifically, by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is compared, judges electrokinetic cell
Total voltage UABWhether electrokinetic cell output total voltage U is more thanCD；If electrokinetic cell total voltage UABTotal electricity is exported more than electrokinetic cell
Press UCD, continue to judge electrokinetic cell output total voltage UCDWhether it is zero；If electrokinetic cell output total voltage UCDIt is not zero, continues
Judge whether electrokinetic cell total current I is more than zero；If electrokinetic cell total current I is more than zero, determine that machine occurs for pre-charge-relay
The normally closed failure in tool end.It should be noted that step S21 and step S104 is choice relation arranged side by side.
Because after the normally closed failure in the mechanical end of pre-charge-relay generation, the mechanical end of pre-charge-relay, which is constantly in, to be closed
Conjunction state, it is not turned off, still will not be disconnected even if receiving and disconnecting relay instruction, be in closure state, main relay
Device, which receives, to be disconnected after relay instructs and can disconnect.Under the normally closed malfunction of pre-charge-relay, main relay has disconnected,
Electrokinetic cell total current I, which will not be produced, is diverted through main relay, electrokinetic cell total current I directly by pre-charge-relay and
Pre-charge resistance reaches high-voltage load system, then pre-charge resistance both ends have voltage, can be to electrokinetic cell total voltage UABCarry out
Partial pressure, obtain electrokinetic cell total voltage UABPortion voltage, then electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCD
It is not equal, electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, and electrokinetic cell output total voltage UCD
It is existing with electrokinetic cell total current I, has numerical value, be not zero, be i.e. electrokinetic cell output total voltage UCDIt is not zero, power
Battery total current I is more than zero.So power battery management system can be according to the electrokinetic cell total voltage U gotAB, power electric
Pond output total voltage UCDAnd electrokinetic cell total current I is compared judgement, when these three parameters meet the second preparatory condition, just
It can determine that the normally closed failure in mechanical end has occurred for pre-charge-relay.
Optionally, methods described also includes：
Step S22：Power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the 3rd preparatory condition, if so, determining main relay and the positive normal off of pre-charge-relay
Open；
Wherein, the 3rd preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, power
Battery output total voltage UCDEqual to zero, and electrokinetic cell total current I is equal to zero.That is UAB>UCD、UCD=0, I=0.
Specifically, by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is compared, judges electrokinetic cell
Total voltage UABWhether electrokinetic cell output total voltage U is more thanCD；If electrokinetic cell total voltage UABTotal electricity is exported more than electrokinetic cell
Press UCD, judge electrokinetic cell total voltage UCDWhether zero is equal to；If so, judging whether electrokinetic cell total current I is equal to zero；It is if dynamic
Power battery total current I is equal to zero, determines that main relay and pre-charge-relay normally disconnect.It should be noted that step S22
It is choice relation arranged side by side with step S104, i.e., step S104, step are the relations that 21 and step S22 is simultaneously column selection.
Because when main relay and normal pre-charge-relay, i.e., without occurring the mechanical normally closed failure in end, it is main after
The mechanical end of electrical equipment, which receives, to be disconnected after relay instructs and can disconnect, and pre-charge-relay, which receives, to be disconnected after relay instructs and can break
Open.In the case of main relay and pre-charge-relay are normally open, whole circuit is breaking, does not have power in circuit
Battery total current I, i.e., dynamic battery total current I are equal to zero, since electrokinetic cell total current I is equal to zero, then electrokinetic cell is defeated
Go out total voltage UCDAnd null, such electrokinetic cell total voltage UABCertainly it is more than electrokinetic cell output total voltage UCD.So
Power battery management system can be according to the electrokinetic cell total voltage U gotAB, electrokinetic cell output total voltage UCDAnd power
Battery total current I is compared judgement, when these three parameters meet three preparatory conditions, it becomes possible to determines main relay and pre-
Charge relay normally disconnects, i.e., main relay and pre-charge-relay are without the mechanical normally closed failure in end of generation.
Based on above-mentioned optional, electrokinetic cell system high-voltage relay method for diagnosing faults provided by the present invention, power electric
Pond management system will be switched off relay instruction and send to main relay and pre-charge-relay, control main relay and precharge after
Electrical equipment disconnects, i.e., main relay and pre-charge-relay should it is already off in the case of, power battery management system obtains
Electrokinetic cell total voltage and electrokinetic cell total current, receive the total electricity of electrokinetic cell output for being gathered by high-voltage load system and being sent
Pressure, and power battery management system judges electrokinetic cell total voltage, electrokinetic cell output total voltage and electrokinetic cell total current
Whether first preparatory condition is met, if so, determining that the mechanical normally closed failure in end occurs for main relay, the first preparatory condition includes：It is dynamic
Power battery total voltage UABWith electrokinetic cell output total voltage UCDIt is equal, electrokinetic cell total voltage UABIt is not zero, and electrokinetic cell is total
Electric current I is more than zero.
Further, power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for pre-charge-relay；
Second preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, electrokinetic cell output total voltage
UCDIt is not zero, and electrokinetic cell total current I is more than zero.
Further, power battery management system judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd
Whether electrokinetic cell total current I meets the 3rd preparatory condition, if so, determining main relay and the positive normal off of pre-charge-relay
Open, the 3rd preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, electrokinetic cell output is always
Voltage UCDEqual to zero, and electrokinetic cell total current I is equal to zero.It can be seen that directly acquisition electrokinetic cell total voltage and electrokinetic cell are total
Electric current, and it is all the existing function of power battery management system to obtain electrokinetic cell to export total voltage by high-voltage load system,
Power battery management system can according to electrokinetic cell total voltage, electrokinetic cell total current and electrokinetic cell export total voltage this three
Individual parameter carries out diagnositc decision to relay failure, and it is normal so directly to carry out relay machinery end using power battery management system
Fault diagnosis is closed, without increasing extra fault diagnosis circuit, reduces the cost of fault diagnosis.And can not only realize to it is main after
Electrical equipment carries out the mechanical normally closed fault diagnosis in end, moreover it is possible to realize and the mechanical normally closed fault diagnosis in end carried out to pre-charge-relay, also without
Extra fault diagnosis circuit need to be increased, reduce the cost of fault diagnosis.
It refer to Fig. 3, a kind of structural representation for power battery management system that Fig. 3 is provided by the embodiment of the present invention,
The power battery management system includes：
Relay control module 111, sent for will be switched off relay instruction to main relay and pre-charge-relay, control
Main relay processed and pre-charge-relay disconnect；
Voltage acquisition module 112, for obtaining electrokinetic cell total voltage UAB；
Current acquisition module 113, for obtaining electrokinetic cell total current I；
Communication module 114, for receiving the electrokinetic cell for being gathered and being sent by high-voltage load system output total voltage UCD；
First judge module 115, for judging electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay；
Wherein, the first preparatory condition includes：Electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is equal, move
Power battery total voltage UABIt is not zero, and electrokinetic cell total current I is more than zero.
Specifically, the first judge module 115 is by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDCompared
Compared with judging electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is whether equal；If electrokinetic cell total voltage UABWith moving
Power battery output total voltage UCDIt is equal, judge electrokinetic cell total voltage UABWhether it is zero；If electrokinetic cell total voltage UABIt is not
Zero, continue to judge whether electrokinetic cell total current I is more than zero；If electrokinetic cell total current I is more than zero, main relay is determined
The mechanical normally closed failure in end.
It should be noted that the connection for the power battery management system and miscellaneous part that the embodiments of the present invention are provided
For relation as shown in Fig. 2 the power battery management system is applied to electrokinetic cell system, electrokinetic cell system includes power electric
Pond, current sensor, main relay, pre-charge-relay, pre-charge resistance and power battery management system, main relay with it is pre-
Charge relay is connected in parallel, and high-voltage load system is connected with electrokinetic cell and main relay, the power battery management system
Realize and fault diagnosis is carried out to the high-voltage relay in electrokinetic cell system, that is, can be used in the high pressure in electrokinetic cell system
Relay carries out fault diagnosis.
A kind of power battery management system provided by the present invention, relay control module will be switched off relay instruction and send
To main relay and pre-charge-relay, main relay and pre-charge-relay is controlled to disconnect, i.e., in main relay and precharge
Relay should it is already off in the case of, voltage acquisition module obtains electrokinetic cell total voltage, and current acquisition module obtains dynamic
Power battery total current, communication module receive the electrokinetic cell output total voltage for being gathered and being sent by high-voltage load system, and first sentences
Disconnected module judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd whether electrokinetic cell total current I meets first
Preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay, the first preparatory condition includes：Electrokinetic cell total voltage
UABWith electrokinetic cell output total voltage UCDIt is equal, electrokinetic cell total voltage UABIt is not zero, and electrokinetic cell total current I is more than zero.
It can be seen that electrokinetic cell total voltage and electrokinetic cell total current are directly obtained, and it is defeated by high-voltage load system acquisition electrokinetic cell
It is all the existing function of power battery management system to go out total voltage, and power battery management system can be always electric according to electrokinetic cell
Pressure, electrokinetic cell total current and electrokinetic cell output these three parameters of total voltage carry out diagnositc decision to relay failure, so
The mechanical normally closed fault diagnosis in end directly is carried out to relay using power battery management system, without increasing extra fault diagnosis
Circuit, reduce the cost of fault diagnosis.
Optionally, the power battery management system also includes：
Second judge module, for judging electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell
Whether total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for pre-charge-relay；
Wherein, the second preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, power
Battery output total voltage UCDIt is not zero, and electrokinetic cell total current I is more than zero.
Specifically, the second judge module is by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is compared,
Judge electrokinetic cell total voltage UABWhether electrokinetic cell output total voltage U is more thanCD；If electrokinetic cell total voltage UABMore than power
Battery output total voltage UCD, continue to judge electrokinetic cell output total voltage UCDWhether it is zero；If electrokinetic cell output total voltage UCD
It is not zero, continues to judge whether electrokinetic cell total current I is more than zero；If electrokinetic cell total current I be more than zero, it is determined that precharge after
The mechanical normally closed failure in end occurs for electrical equipment.
Optionally, the power battery management system also includes：
3rd judge module, for judging electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell
Whether total current I meets the 3rd preparatory condition, if so, determining that main relay and pre-charge-relay normally disconnect；
Wherein, the 3rd preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, power
Battery output total voltage UCDEqual to zero, and electrokinetic cell total current I is equal to zero.
Specifically, by electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCDIt is compared, judges electrokinetic cell
Total voltage UABWhether electrokinetic cell output total voltage U is more thanCD；If electrokinetic cell total voltage UABTotal electricity is exported more than electrokinetic cell
Press UCD, judge electrokinetic cell total voltage UCDWhether zero is equal to；If electrokinetic cell output total voltage UCDEqual to zero, power electric is judged
Whether pond total current I is equal to zero；If electrokinetic cell total current I is equal to zero, determine that main relay and pre-charge-relay are normal
Disconnect.
A kind of power battery management system provided by the present invention, relay control module will be switched off relay instruction and send
To main relay and pre-charge-relay, main relay and pre-charge-relay is controlled to disconnect, i.e., in main relay and precharge
Relay should it is already off in the case of, voltage acquisition module obtains electrokinetic cell total voltage, and current acquisition module obtains dynamic
Power battery total current, communication module receive the electrokinetic cell output total voltage for being gathered and being sent by high-voltage load system, and first sentences
Disconnected module judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd whether electrokinetic cell total current I meets first
Preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for main relay, the first preparatory condition includes：Electrokinetic cell total voltage
UABWith electrokinetic cell output total voltage UCDIt is equal, electrokinetic cell total voltage UABIt is not zero, and electrokinetic cell total current I is more than zero.
Further, the second judge module judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for pre-charge-relay；Second
Preparatory condition includes：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, electrokinetic cell output total voltage UCDNo
It is zero, and electrokinetic cell total current I is more than zero.
Further, the 3rd judge module judges electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power
Whether battery total current I meets the 3rd preparatory condition, if so, determine that main relay and pre-charge-relay normally disconnect, the
Three preparatory conditions include：Electrokinetic cell total voltage UABMore than electrokinetic cell output total voltage UCD, electrokinetic cell output total voltage UCD
Equal to zero, and electrokinetic cell total current I is equal to zero.It can be seen that electrokinetic cell total voltage and electrokinetic cell total current are directly obtained, and
It is all the existing function of power battery management system to obtain electrokinetic cell to export total voltage by high-voltage load system, electrokinetic cell
Management system can be according to these three parameters pair of electrokinetic cell total voltage, electrokinetic cell total current and electrokinetic cell output total voltage
Relay failure carries out diagnositc decision, so directly carries out the mechanical normally closed failure in end to relay using power battery management system
Diagnosis, without increasing extra fault diagnosis circuit, reduces the cost of fault diagnosis.And it can not only realize to enter main relay
The mechanical normally closed fault diagnosis in end of row, moreover it is possible to realize and the mechanical normally closed fault diagnosis in end is carried out to pre-charge-relay, without increase
Extra fault diagnosis circuit, reduce the cost of fault diagnosis.
Above to a kind of electrokinetic cell system high-voltage relay method for diagnosing faults provided by the present invention and related system
It is described in detail.Specific case used herein is set forth to the principle and embodiment of the present invention, and the above is real
The explanation for applying example is only intended to help the method and its core concept for understanding the present invention.It should be pointed out that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention,
These are improved and modification is also fallen into the protection domain of the claims in the present invention.
Claims (6)
- A kind of 1. electrokinetic cell system high-voltage relay method for diagnosing faults, it is characterised in that including：Power battery management system will be switched off relay instruction and send to main relay and pre-charge-relay, control the master after Electrical equipment and the pre-charge-relay disconnect；The power battery management system obtains electrokinetic cell total voltage UABAnd electrokinetic cell total current I；The power battery management system receives the electrokinetic cell output total voltage U for being gathered and being sent by high-voltage load systemCD；The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power electric Whether pond total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the main relay；Wherein, first preparatory condition includes：The electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCD It is equal, the electrokinetic cell total voltage UABIt is not zero, and the electrokinetic cell total current I is more than zero；Wherein, electrokinetic cell system includes electrokinetic cell, current sensor, main relay, pre-charge-relay, pre-charge resistance And power battery management system；The mechanical end of main relay respectively with the electric capacity of the positive level of electrokinetic cell and high-voltage load system Positive level is connected, and the mechanical end of pre-charge-relay is connected with the positive level and pre-charge resistance of electrokinetic cell respectively, high-voltage load system The negative pole of the electric capacity of system is connected with the negative pole of electrokinetic cell, and the positive pole of the electric capacity of high-voltage load system is connected with main relay；UAB The total current exported for the total voltage at electrokinetic cell both ends, I for electrokinetic cell, UCDIt is the both ends of the electric capacity of high-voltage load system Voltage.
- 2. the method as described in claim 1, it is characterised in that also include：The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power electric Whether pond total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the pre-charge-relay；Wherein, second preparatory condition includes：The electrokinetic cell total voltage UABTotal voltage is exported more than the electrokinetic cell UCD, the electrokinetic cell output total voltage UCDIt is not zero, and the electrokinetic cell total current I is more than zero.
- 3. the method as described in claim 1, it is characterised in that also include：The power battery management system judges the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd power electric Whether pond total current I meets the 3rd preparatory condition, if so, determining the main relay and the positive normal off of the pre-charge-relay Open；Wherein, the 3rd preparatory condition includes：The electrokinetic cell total voltage UABTotal voltage is exported more than the electrokinetic cell UCD, the electrokinetic cell output total voltage UCDEqual to zero, and the electrokinetic cell total current I is equal to zero.
- A kind of 4. power battery management system, it is characterised in that including：Relay control module, sent for will be switched off relay instruction to main relay and pre-charge-relay, described in control Main relay and the pre-charge-relay disconnect；Voltage acquisition module, for obtaining electrokinetic cell total voltage UAB；Current acquisition module, for obtaining electrokinetic cell total current I；Communication module, for receiving the electrokinetic cell for being gathered and being sent by high-voltage load system output total voltage UCD；First judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell Whether total current I meets the first preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the main relay；Wherein, first preparatory condition includes：The electrokinetic cell total voltage UABWith electrokinetic cell output total voltage UCD It is equal, the electrokinetic cell total voltage UABIt is not zero, and the electrokinetic cell total current I is more than zero；Wherein, electrokinetic cell system includes electrokinetic cell, current sensor, main relay, pre-charge-relay, pre-charge resistance And power battery management system；The mechanical end of main relay respectively with the electric capacity of the positive level of electrokinetic cell and high-voltage load system Positive level is connected, and the mechanical end of pre-charge-relay is connected with the positive level and pre-charge resistance of electrokinetic cell respectively, high-voltage load system The negative pole of the electric capacity of system is connected with the negative pole of electrokinetic cell, and the positive pole of the electric capacity of high-voltage load system is connected with main relay；UAB The total current exported for the total voltage at electrokinetic cell both ends, I for electrokinetic cell, UCDIt is the both ends of the electric capacity of high-voltage load system Voltage.
- 5. power battery management system as claimed in claim 4, it is characterised in that the power battery management system also wraps Include：Second judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell Whether total current I meets the second preparatory condition, if so, determining that the mechanical normally closed failure in end occurs for the pre-charge-relay；Wherein, second preparatory condition includes：The electrokinetic cell total voltage UABTotal voltage is exported more than the electrokinetic cell UCD, the electrokinetic cell output total voltage UCDIt is not zero, and the electrokinetic cell total current I is more than zero.
- 6. power battery management system as claimed in claim 4, it is characterised in that the power battery management system also wraps Include：3rd judge module, for judging the electrokinetic cell total voltage UAB, electrokinetic cell output total voltage UCDAnd electrokinetic cell Whether total current I meets the 3rd preparatory condition, if so, determining the main relay and the positive normal off of the pre-charge-relay Open；Wherein, the 3rd preparatory condition includes：The electrokinetic cell total voltage UABTotal voltage is exported more than the electrokinetic cell UCD, the electrokinetic cell output total voltage UCDEqual to zero, and the electrokinetic cell total current I is equal to zero.
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| CN106338688B (en) * | 2016-08-24 | 2019-11-26 | 深圳市科列技术股份有限公司 | Vehicle mounted battery management system main relay adhesion detection circuit and its detection method |
| CN107482591A (en) * | 2017-08-01 | 2017-12-15 | 安徽欧鹏巴赫新能源科技有限公司 | A kind of on-board high-voltage relay safety protecting method |
| DE102017223229A1 (en) * | 2017-12-19 | 2019-06-19 | Volkswagen Aktiengesellschaft | Electrical system and method for diagnosing the functionality of power relays in an electrical system |
| CN108761324B (en) * | 2018-06-15 | 2021-03-26 | 爱驰汽车有限公司 | Diagnosis method and device for functional responsiveness fault of high-voltage relay of battery pack |
| US10838008B2 (en) * | 2018-07-13 | 2020-11-17 | GM Global Technology Operations LLC | Battery switch testing system and method |
| CN112924859B (en) * | 2021-01-26 | 2022-10-14 | 东风汽车集团股份有限公司 | Electric automobile high-voltage pre-charging loop and relay adhesion state detection method |
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Application publication date: 20151028 Assignee: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. Assignor: Chongqing Changan Automobile Co.,Ltd.|CHONGQING CHANG'AN NEW ENERGY AUTOMOBILE Co.,Ltd. Contract record no.: 2018500000022 Denomination of invention: Power cell system high-voltage relay fault diagnosis method and relevant system Granted publication date: 20180223 License type: Exclusive License Record date: 20181130 |
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Effective date of registration: 20190109 Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. Address before: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Co-patentee before: CHONGQING CHANG'AN NEW ENERGY AUTOMOBILE Co.,Ltd. Patentee before: Chongqing Changan Automobile Co.,Ltd. |
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Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |