CN104802655B - Electric drive system for electric vehicles HVDC end open circuit diagnostic system - Google Patents
Electric drive system for electric vehicles HVDC end open circuit diagnostic system Download PDFInfo
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- CN104802655B CN104802655B CN201410035036.3A CN201410035036A CN104802655B CN 104802655 B CN104802655 B CN 104802655B CN 201410035036 A CN201410035036 A CN 201410035036A CN 104802655 B CN104802655 B CN 104802655B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The diagnostic system the invention discloses a kind of electric drive system for electric vehicles HVDC end is opened a way, which includes positive switch, precharge switch, pre-charge resistance, negative switch, open-circuit voltage detection means, battery management system；After precharge switch and pre-charge resistance series connection, positive switch two ends are parallel to；Open-circuit voltage detection means is installed in parallel in negative switch two ends, for detecting the magnitude of voltage at negative switch two ends；Positive switch two ends are used to be connected on high-tension battery anode between the proper pole of HVDC；Negative switch two ends are used to be connected on high-tension battery negative terminal between the negative pole of HVDC end；Battery management system is used to control positive switch, precharge switch, negative switch break-make, and communicates with open-circuit voltage detection means, whole-control system.The present invention, in electric current journey on high pressure, the situation of change of the negative switch both end voltage before and after being closed by precharge switch can safely, effectively detect whether HVDC end accesses inverter.
Description
Technical field
The present invention relates to electronic（Pure electric or hybrid）Automobile high-voltage safety technology, more particularly to a kind of electric automobile
Power drive system HVDC end open circuit diagnostic system.
Background technology
Automotive safety is all emphasis of concern all the time, current electric automobile（Including pure electronic and hybrid power
Automobile）Power drive system employs high-pressure system mostly, and high-voltage safety becomes electric automobile field and pays close attention to object, high pressure peace
Full technology becomes one of the field key technology.
Inverter as electric drive system for electric vehicles core component, its high-voltage interlocking under normal circumstances（HVIL）Loop leads to
Upper cover plate realization is crossed, correct erection sequence rectifies pole for connection HVDC（T+）, negative pole（T-）And the output of UVW three-phases,
After normal connection, close inverter upper cover plate, high-voltage interlocking circuit closed, it is allowed to electricity on high pressure.If do not install
Plate, high-voltage interlocking loop disconnect, and now do not allow electricity on high pressure, there is no high pressure risk.However, high pressure is found in practical application
There is following potential high-voltage safety risk in DC terminal：Due to HVDC end（T+、T-）It is without individually designed HVIL, wrong in personnel
In the case of maloperation, not by HVDC end（T+、T-）Inverter internal is installed to, but closed inverter upper cover plate, it is high
Pressure interlocking loop closure, it is allowed to electricity on high pressure, if now starting high-pressure system, due to HVDC end（T+、T-）It is exposed outside,
There is potential high pressure electric shock risk, as shown in Figure 1.
For the problems referred to above, existing solution is at HVDC two ends（T+、T-）The HVIL of design, the program
Shortcoming is：1）Connector is relatively costly, and volume is larger；2）Inside inverter end HVIL, cabling is complicated；3）HVIL failures bring
Wrong diagnosis.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of electric drive system for electric vehicles HVDC end open circuit diagnosis
System, can safely, effectively detect whether HVDC end accesses inverter, evade HVDC end and do not design high-voltage interlocking and bring
Potential high pressure risk, simple and convenient, it is easy to transform, implementation cost is low.
To solve above-mentioned technical problem, the electric drive system for electric vehicles HVDC end open circuit diagnosis system that the present invention is provided
System, which includes positive switch, precharge switch, pre-charge resistance, negative switch, open-circuit voltage detection means, battery management system
System；
After the precharge switch and pre-charge resistance series connection, positive switch two ends are parallel to；
The open-circuit voltage detection means, is installed in parallel in negative switch two ends, for detecting the electricity at negative switch two ends
Pressure value；
The positive switch two ends, rectify between pole with HVDC for being connected on high-tension battery anode；
The negative switch two ends, for being connected on high-tension battery negative terminal between the negative pole of HVDC end；
HVDC rectifies pole, for being connected to inverter positive input terminal；
HVDC end negative pole, for being connected to inverter negative input end；
The battery management system, for controlling the positive switch, precharge switch, negative switch break-make, and is opened together
Road voltage check device, whole-control system communication；The battery management system, the course of work are as follows：
One. control positive switch, precharge switch, negative switch are all in off-state；
Two. if electric desired signal on high pressure would be received, step 3 is carried out；
Three. voltage V before the closure at the negative switch two ends of record open-circuit voltage detection means detection0；
Four. control precharge switch closure；
Five. voltage V after the closure at the negative switch two ends of record open-circuit voltage detection means detection1；
If six. | V1-V0|<N, N are the positive number demarcated, then export HVDC end and do not access fault of converter signal, enter
Row step 12；Step 7 is carried out otherwise；
Seven. send HVDC and rectify the normal signal that accesses to vehicle management system；
Eight. when electricity instruction on the high pressure that vehicle management system sends is received, then control negative switch closure；
If nine. it would be pre-charged in setting time and would not complete, output precharge failure fault-signal carries out step 10
Two；If be pre-charged in setting time completed, step 10 is carried out；
Ten. control positive switch closure；
11. electricity success on high pressure, terminates；
12. electricity failure on high pressure, control positive switch, precharge switch and negative switch disconnect, and terminate.
Preferably, the positive switch, precharge switch, negative switch, are relay or switching tube.
Preferably, in step 11, electricity success on high pressure, the battery management system control precharge switch disconnect, knot
Beam.
Preferably, in step 4, after the battery management system sends precharge switch closure control signal, and judging pre-
Whether charge switch closes, if precharge switch is closed, carries out step 5；Otherwise, export precharge switch connection to lose
Fault-signal is lost, step 12 is carried out.
Preferably, in step 8, after the battery management system sends negative switch closure control signal, and judging negative pole
Whether switch closes, if negative switch is closed, carries out step 9；Otherwise, output negative pole switch connection failure failure letter
Number, carry out step 12.
Preferably, in step 10, after the battery management system sends positive switch closure control signal, and judging positive pole
Whether switch closes, if positive switch is closed, carries out step 11；Otherwise, output cathode switch connection failure failure
Signal, carries out step 12..
The electric drive system for electric vehicles HVDC end open circuit diagnostic system of the present invention, before electricity on high pressure, cell tube
Reason system BMS is initialized, and makes positive switch S+, precharge switch Sp, negative switch S- all in off-state；There is high pressure
During upper electric demand, voltage V before the closure at battery management system BMS record negative switch two ends0, then control precharge switch Sp
Closure, records voltage V after the closure at negative switch two ends1, and judge negative switch S- two before and after precharge switch Sp closure
The voltage change at end | V1-V0| whether more than or equal to a scalar quantity N, scalar quantity N need to meet and be capable of detecting when that precharge switch Sp is closed
Negative switch S- both end voltage before and after conjunction has obvious saltus step, if the negative switch S- two ends before and after precharge switch Sp closure
Voltage change | V1-V0| more than or equal to a scalar quantity N, then judge HVDC end（T+, T-）Access inverter, it is allowed to car load
Management system VMS sends electricity instruction on high pressure, otherwise exports HVDC and rectifies pole（T+, T-）Fault of converter letter is not accessed
Number.The electric drive system for electric vehicles HVDC end open circuit diagnostic system of the present invention, in electric current journey on high pressure, by preliminary filling
It is inverse that the situation of change of the negative switch both end voltage before and after electric switch closure can safely, effectively detect whether HVDC end is accessed
Become device, and due to when precharge switch Sp starts closure, positive switch S+ and negative switch S- all in off-state, i.e.,
Make HVDC end（T+、T-）Not connected inverter, will not also bring high pressure risk, can evade HVDC end（T+、T-）
High-voltage interlocking is not designed（HVIL）The potential high pressure risk brought, simple and convenient, it is easy to transform, implementation cost is low.
Description of the drawings
In order to be illustrated more clearly that technical scheme, the accompanying drawing to using required for the present invention makees simple below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the potential risk schematic diagram that high-voltage interlocking is not installed at HVDC end；
Fig. 2 is electric drive system for electric vehicles HVDC end open circuit one embodiment schematic diagram of diagnostic system of the present invention；
The battery management of electric drive system for electric vehicles HVDC end open circuit one embodiment of diagnostic system of Fig. 3 present invention
System work process schematic diagram；
The effect of electric drive system for electric vehicles HVDC end open circuit one embodiment of diagnostic system of Fig. 4 present invention is illustrated
Figure.
Specific embodiment
Below in conjunction with accompanying drawing, clear, complete description is carried out to the technical scheme in the present invention, it is clear that described
Embodiment is a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is general
All other embodiment that logical technical staff is obtained on the premise of creative work is not made, belongs to protection of the present invention
Scope.
Embodiment one
Electric drive system for electric vehicles HVDC end is opened a way diagnostic system, as shown in Fig. 2 including positive switch S+, in advance
Charge switch Sp, pre-charge resistance R, negative switch S-, open-circuit voltage detection means VM, battery management system BMS；
After precharge switch Sp and pre-charge resistance R series connection, positive switch S+ two ends are parallel to；
Open-circuit voltage detection means VM, is installed in parallel in negative switch S- two ends, for detecting negative switch S- two
The magnitude of voltage at end；
The positive switch S+ two ends, rectify between the T+ of pole with HVDC for being connected on high-tension battery E anodes；
The negative switch S- two ends, for being connected on high-tension battery E negative terminals between the negative pole T- of HVDC end；
HVDC rectifies pole T+, for being connected to inverter positive input terminal；
HVDC end negative pole T-, for being connected to inverter negative input end；
The battery management system BMS, leads to for controlling positive switch S+, precharge switch Sp, negative switch S-
It is disconnected, and communicate with open-circuit voltage detection means VM, vehicle management system VMS；The battery management system BMS, as shown in figure 3,
The course of work is as follows：
One. before electricity on high pressure, initialized, control positive switch S+, precharge switch Sp, negative switch S- are all located
In off-state；
Two. if electric desired signal on high pressure would be received, step 3 is carried out；
Three. voltage V before the closure at the negative switch S- two ends of record open-circuit voltage detection means VM detection0；
Four. control precharge switch Sp closure；
Five. voltage V after the closure at the negative switch S- two ends of record open-circuit voltage detection means VM detection1；
If six. | V1-V0|<N, N are the positive number demarcated, then export HVDC end（T+, T-）Fault of converter is not accessed
Signal, carries out step 12；Step 7 is carried out otherwise；
Seven. send HVDC and rectify the normal signal that accesses to vehicle management system VMS；
Eight. when electricity instruction on the high pressure that vehicle management system VMS sends is received, then control negative switch S- closure；
If nine. it would be pre-charged in setting time and would not complete, output precharge failure fault-signal carries out step 10
Two；If be pre-charged in setting time completed, step 10 is carried out；
Ten. control positive switch S+ closure；
11. electricity success on high pressure, terminates；
12. electricity failure on high pressure, control positive switch S+, precharge switch Sp and negative switch S- disconnect, and stop connecting
High pressure is connect, is terminated.
Positive switch S+, precharge switch Sp, negative switch S- can be that there is switch to make for relay, switching tube etc.
Electronic devices and components.
Preferably, in step 11, electricity success on high pressure, the battery management system control precharge switch disconnect, knot
Beam.
Preferably, in step 4, after the battery management system BMS sends precharge switch closure control signal, and sentencing
Whether disconnected precharge switch Sp closes, if precharge switch Sp is closed, carries out step 5；Otherwise, export preliminary filling to establish by cable
Connection failure fault-signal is closed, step 12 is carried out.
In step 8, after the battery management system BMS sends negative switch closure control signal, and negative switch is judged
Whether S- closes, if negative switch S- is closed, carries out step 9；Otherwise, output negative pole switch connection failure failure letter
Number, carry out step 12.
In step 10, after the battery management system BMS sends positive switch closure control signal, and positive switch is judged
Whether S+ closes, if positive switch S+ is closed, carries out step 11；Otherwise, output cathode switch connection failure failure
Signal, carries out step 12.
Switch in general（Precharge switch Sp, positive switch S+, negative switch S-）By control section and executable portion
Composition, battery management system BMS by compare switch actuating station both sides voltage come judge switch whether close, both sides voltage
It is equal, it is judged as that switch is closed.
Whether precharge completes, and can pass through to judge the voltage between inverter positive input terminal and negative input end（It is connected on
The voltage at the electric capacity C two ends between inverter input terminal）To realize, when electric capacity C both end voltages reach actual high-voltage battery two ends electricity
Setting ratio X (X is the positive number less than 1, and X can be demarcated) of pressure, then it is assumed that precharge is completed.
The electric drive system for electric vehicles HVDC end open circuit diagnostic system of embodiment one, if HVDC end（T+、
T-）Inverter is not accessed at two ends, then before and after precharge switch Sp closure, the negative switch that open-circuit voltage detection means VM is detected
S- both end voltages are basically unchanged；If HVDC end（T+、T-）Inverter is accessed at two ends, then before precharge switch Sp closure
Afterwards, the negative switch S- both end voltage that open-circuit voltage detection means VM is detected has more obvious saltus step.Therefore, utilizing should
Principle, as long as before and after precharge switch Sp closure is detected in above-mentioned high pressure power up there not being negative switch S- both end voltage
Substantially saltus step, you can judge HVDC end（T+、T-）Inverter is not accessed, stops continuing electricity on high pressure by software control.
The electric drive system for electric vehicles HVDC end open circuit diagnostic system of embodiment one, before electricity on high pressure, battery management system
BMS is initialized, and makes positive switch S+, precharge switch Sp, negative switch S- all in off-state；There is electricity on high pressure to need
When asking, then voltage V0 before the closure at battery management system BMS record negative switch two ends controls precharge switch Sp closure,
Voltage V after the closure at record negative switch two ends1, and judge precharge switch Sp closure before and after negative switch S- two ends electricity
Buckling | V1-V0| whether more than or equal to a scalar quantity N, scalar quantity N need to meet be capable of detecting when precharge switch Sp closure before and after
Negative switch S- both end voltage have obvious saltus step, if precharge switch Sp closure before and after negative switch S- two ends voltage
Change | V1-V0| more than or equal to a scalar quantity N, then judge HVDC end（T+, T-）Access inverter, it is allowed to car load management system
System VMS sends electricity instruction on high pressure, otherwise exports HVDC and rectifies pole（T+, T-）Fault of converter signal is not accessed.Implement
The electric drive system for electric vehicles HVDC end open circuit diagnostic system of example one, in electric current journey on high pressure, is established by cable by preliminary filling
The situation of change of the negative switch both end voltage closed before and after closing can safely, effectively detect whether HVDC end accesses inversion
Device, and due to when precharge switch Sp starts closure, positive switch S+ and negative switch S- all in off-state, even if
HVDC end（T+、T-）Not connected inverter, will not also bring high pressure risk, can evade HVDC end（T+、T-）Not
Design high-voltage interlocking（HVIL）The potential high pressure risk brought, simple and convenient, it is easy to transform, implementation cost is low.
The implementation result of specific embodiment is verified by Portunus simulation softwares.It is imitative with certain actual power drive system
True object, high-tension battery voltage be 300V, in inverter electric capacity C capacitances be 500 μ F, the initial both end voltages of electric capacity C be 0V, positive pole
Switch S+ and negative switch S- disconnect, and give precharge switch Sp mono- step signal（From being disconnected to closure）, by open-circuit voltage
Detection means VM observing negative switch S- both sides voltage, from measurement result, when HVDC end（T+、T-）Access inversion
During device, negative switch S- both end voltage jumps to 300V from 0, obvious saltus step occurs, if without obvious saltus step, battery management system
BMS controls stop electricity on high pressure immediately.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements done etc. are should be included within the scope of protection of the invention.
Claims (6)
1. a kind of electric drive system for electric vehicles HVDC end is opened a way diagnostic system, including positive switch, precharge switch, pre-
Charging resistor, negative switch, open-circuit voltage detection means, battery management system；
After the precharge switch and pre-charge resistance series connection, positive switch two ends are parallel to；
The open-circuit voltage detection means, is installed in parallel in negative switch two ends, for detecting the magnitude of voltage at negative switch two ends；
The positive switch two ends, rectify between pole with HVDC for being connected on high-tension battery anode；
The negative switch two ends, for being connected on high-tension battery negative terminal between the negative pole of HVDC end；
HVDC rectifies pole, for being connected to inverter positive input terminal；
HVDC end negative pole, for being connected to inverter negative input end；Characterized in that,
The battery management system, for controlling the positive switch, precharge switch, negative switch break-make, and with open circuit electricity
Pressure detection means, whole-control system communication；The battery management system, the course of work are as follows：
One. control positive switch, precharge switch, negative switch are all in off-state；
Two. if electric desired signal on high pressure would be received, step 3 is carried out；
Three. voltage V before the closure at the negative switch two ends of record open-circuit voltage detection means detection0；
Four. control precharge switch closure；
Five. voltage V after the closure at the negative switch two ends of record open-circuit voltage detection means detection1；
If six. | V1-V0|<N, N are the positive number demarcated, then export HVDC end and do not access fault of converter signal, walked
Rapid 12；Step 7 is carried out otherwise；
Seven. send HVDC and rectify the normal signal that accesses to vehicle management system；
Eight. when electricity instruction on the high pressure that vehicle management system sends is received, then control negative switch closure；
If nine. it would be pre-charged in setting time and would not complete, output precharge failure fault-signal carries out step 12；Such as
Fruit is pre-charged in setting time and completes, then carry out step 10；
Ten. control positive switch closure；
11. electricity success on high pressure, terminates；
12. electricity failure on high pressure, control positive switch, precharge switch and negative switch disconnect, and terminate.
2. electric drive system for electric vehicles HVDC end according to claim 1 is opened a way diagnostic system, it is characterised in that
The positive switch, precharge switch, negative switch, are relay or switching tube.
3. electric drive system for electric vehicles HVDC end according to claim 1 is opened a way diagnostic system,
In step 11, electricity success on high pressure, the battery management system control precharge switch disconnect, and terminate.
4. electric drive system for electric vehicles HVDC end according to claim 1 is opened a way diagnostic system, it is characterised in that
In step 4, after the battery management system sends precharge switch closure control signal, and judge that precharge switch is
No closure, if precharge switch is closed, carries out step 5；Otherwise, precharge switch connection failure fault-signal is exported,
Carry out step 12.
5. electric drive system for electric vehicles HVDC end according to claim 1 is opened a way diagnostic system, it is characterised in that
In step 8, after the battery management system sends negative switch closure control signal, and judge whether negative switch closes
Close, if negative switch is closed, carry out step 9；Otherwise, output negative pole switch connection failure fault-signal, carries out step
12.
6. electric drive system for electric vehicles HVDC end according to claim 1 is opened a way diagnostic system, it is characterised in that
In step 10, after the battery management system sends positive switch closure control signal, and judge whether positive switch closes
Close, if positive switch is closed, carry out step 11；Otherwise, output cathode switch connection failure fault-signal, is walked
Rapid 12.
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| CN106564390B (en) * | 2015-10-12 | 2020-04-21 | 北京新能源汽车股份有限公司 | Electric automobile and high-voltage system, detection method and pre-charging circuit thereof |
| CN106274528B (en) * | 2016-08-26 | 2018-08-28 | 朱利东 | Pre-charge circuit with automatic control function and method |
| CN107872090B (en) * | 2016-09-27 | 2021-03-30 | 南京南瑞继保电气有限公司 | Energy storage battery pre-charging circuit and pre-charging method |
| CN109524945A (en) * | 2017-09-19 | 2019-03-26 | 联合汽车电子有限公司 | A kind of protection circuit and its control method and power-supply system |
| CN108594105B (en) * | 2018-02-07 | 2021-02-09 | 深圳微步信息股份有限公司 | Detection method for control circuit of main board indicator light |
| CN113071315B (en) * | 2021-03-10 | 2022-10-11 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
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| TW403838B (en) * | 1997-10-30 | 2000-09-01 | Matsushita Electric Ind Co Ltd | Electric leak detecting method and apparatus for electric motorcars |
| JP2005333770A (en) * | 2004-05-21 | 2005-12-02 | Sanyo Electric Co Ltd | Inverter for automobile |
| EP1909369B1 (en) * | 2006-10-06 | 2020-05-20 | Schmidhauser AG | Switching assembly and method for insulation monitoring for converter applications in operation |
| US8283929B2 (en) * | 2010-06-01 | 2012-10-09 | GM Global Technology Operations LLC | Method and apparatus to monitor electric isolation of a high-voltage direct current electrical circuit |
| DE102010054413A1 (en) * | 2010-12-14 | 2011-08-25 | Daimler AG, 70327 | Method for locating insulation fault in electrical system of car, involves determining whether insulation fault is present in direct current-portion or alternating current portion based on measurement results |
| EP2487496A1 (en) * | 2011-02-11 | 2012-08-15 | Saab Automobile Ab | Method for isolation measurements using pre-charge and discharge circuitry |
| CN102841284B (en) * | 2011-06-22 | 2015-02-18 | 同济大学 | On-line insulated monitoring method for high voltage of electromobile |
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