CN110239373A - The pre-charge circuit and its method for diagnosing faults and driving method of electric car - Google Patents
The pre-charge circuit and its method for diagnosing faults and driving method of electric car Download PDFInfo
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- CN110239373A CN110239373A CN201910536253.3A CN201910536253A CN110239373A CN 110239373 A CN110239373 A CN 110239373A CN 201910536253 A CN201910536253 A CN 201910536253A CN 110239373 A CN110239373 A CN 110239373A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to electric vehicle engineering field, the pre-charge circuit and its method for diagnosing faults and driving method of a kind of electric car are provided.Wherein pre-charge circuit includes: battery module, has opposite polarity first electrode and second electrode；Concatenated first main switch part and current sensor；Concatenated preliminary filling switchs part and preliminary filling resistance, preliminary filling switchs part and the first main switch part are parallel to a first node, and first node is connected to first electrode, and preliminary filling resistance and current sensor are parallel to a second node；Stabilization capacitor and load in parallel, stablizes capacitor and load is parallel between second node and a third node；And the second main switch part, it is connected between second electrode and third node.The curent change that the present invention is detected by current sensor can go out the state of each switch member in pre-charge circuit in conjunction with the voltage of voltage and stable capacitor both ends between preliminary filling switchs part and preliminary filling resistance with Accurate Diagnosis.
Description
Technical field
The present invention relates to electric vehicle engineering fields, specifically, being related to a kind of precharge electricity suitable for electric car
The method for diagnosing faults and driving method of road and the pre-charge circuit.
Background technique
Current electric car is increasingly widely used, the electric machine controller in electric car because there is the presence of X capacitor,
The short circuit of powered on moment X capacitor in order to prevent increases pre-charge resistance and pre-charge-relay, and the pre-charge circuit of formation is as schemed
Shown in 1.
The tradition pre-charge circuit includes preliminary filling relay K11, preliminary filling resistance R12, main positive relay K13, main negative relay
Device K14, X capacitor C15, battery pack A16.
In traditional pre-charge circuit, the diagnosis of relay is predominantly detected between preliminary filling relay K11 and preliminary filling resistance R12
Voltage (being denoted as K11-R12 voltage) and voltage (the being denoted as C15 voltage) Lai Shixian at the both ends X capacitor C15.Only pass through K11-R12
Voltage and C15 voltage generally can not accurately be diagnosed to be the state of relay, such as:
If input preliminary filling relay K11 is disconnected, the signal of main negative relay K14 closure, when detect K11-R12 voltage and
C15 voltage is timing, can not accurately judge to lead because of preliminary filling relay K11 adhesion or main positive relay K13 adhesion
It causes；
If the signal that input preliminary filling relay K11 and main negative relay K14 are disconnected, when detecting that K11-R12 voltage is
Just, when C15 voltage is zero, can not accurately judge it is because the improper closure of preliminary filling relay K11 or main positive relay K13 are viscous
Even cause.
If can not Accurate Diagnosis relay state in the case where pre-charge circuit come into operation, vehicle can be damaged
Circuit system.
It should be noted that the information in above-mentioned background technology part application is only used for reinforcing the reason to background of the invention
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
In view of this, the present invention provides pre-charge circuit and its method for diagnosing faults and the driving side of a kind of electric car
Method, to overcome the problems, such as that relay status can not Accurate Diagnosis.
According to an aspect of the present invention, a kind of pre-charge circuit of electric car is provided, comprising: battery module,
With opposite polarity first electrode and second electrode；Concatenated first main switch part and current sensor；Concatenated preliminary filling is opened
It closes part and preliminary filling resistance, the preliminary filling switchs part and the first main switch part is parallel to a first node, the first node
It is connected to the first electrode, the preliminary filling resistance and the current sensor are parallel to a second node；In parallel stablizes electricity
Hold and load, the stable capacitor and the load are parallel between the second node and a third node；And second is main
Switch member is connected between the second electrode and the third node.
Preferably, in above-mentioned pre-charge circuit, the first electrode is the positive electrode of the battery module, described second
Electrode is the negative electrode of the battery module；Alternatively, the first electrode is the negative electrode of the battery module, second electricity
Pole is the positive electrode of the battery module.
Preferably, in above-mentioned pre-charge circuit, the battery module includes concatenated multiple battery modules, the battery
Mould group includes concatenated multiple battery cells.
Preferably, in above-mentioned pre-charge circuit, further include a third switch, be connected to two adjacent battery modules it
Between.
Preferably, in above-mentioned pre-charge circuit, the first main switch part, the preliminary filling switchs part, second master
Switch member respectively includes one or more switch elements, and the switch element is that relay, contactor, electronic switch, air are opened
Any one of close.
Preferably, in above-mentioned pre-charge circuit, the current sensor is Hall sensor or shunting sensor.
According to another aspect of the present invention, a kind of method for diagnosing faults is provided, applied to the pre- of above-mentioned electric car
Charging circuit, the method for diagnosing faults include: the first voltage monitored between the preliminary filling switchs part and the preliminary filling resistance
The current value of value, the second voltage value at the stable capacitor both ends and the current sensor；To the preliminary filling switchs part
And/or the second main switch part sends closure signal；According to the first voltage value, the second voltage value and the electric current
Value diagnoses the state of the first main switch part, the preliminary filling switchs part and the second main switch part.
Preferably, in above-mentioned method for diagnosing faults, when the preliminary filling switchs part and the equal patent of the second main switch part
When conjunction, if the first voltage value is positive voltage, the second voltage value is zero, the current value is zero, described is judged
One main switch part adhesion.
Preferably, in above-mentioned method for diagnosing faults, when only sending closure signal to the preliminary filling switchs part, if described
It is zero that the first voltage value and the second voltage value, which are positive voltage, the current value, then judges that the second main switch part is viscous
Even；If the first voltage value and the second voltage value are zero, the current value is zero, then judges the preliminary filling switchs part
Abnormal disconnection.
Preferably, in above-mentioned method for diagnosing faults, when only sending closure signal to the second main switch part, if institute
State the first voltage value and the second voltage value be positive voltage, the current value be positive current, then judge it is described first master open
Close part adhesion；If the first voltage value and the second voltage value are positive voltage, the current value is zero, then described in judgement
Preliminary filling switchs part adhesion.
Preferably, it in above-mentioned method for diagnosing faults, is sent when to the preliminary filling switchs part and the second main switch part
When closure signal, if the first voltage value is positive voltage, the second voltage value is zero, the current value is zero, judge
The second main switch part abnormal disconnection.
According to another aspect of the present invention, a kind of driving method is provided, the precharge applied to above-mentioned electric car
Circuit, the driving method include: successively to send closure signal, driving to the second main switch part and the preliminary filling switchs part
The pre-charge circuit enters pre-charge process；In the pre-charge process, monitor and according to the preliminary filling switchs part and institute
State the first voltage value, the second voltage value at the stable capacitor both ends and the electric current of the current sensor between preliminary filling resistance
Value diagnoses the state of the first main switch part, the preliminary filling switchs part and the second main switch part, if the event of either switch part
Barrier then stops the pre-charge process；When the pre-charge process terminates, Xiang Suoshu the first main switch part sends closure signal, to
The preliminary filling switchs part sends cut-off signal, and the pre-charge circuit is driven to convey voltage to the load.
Preferably, in above-mentioned driving method, the first main switch part, the preliminary filling switchs part and described second are diagnosed
The state of main switch part, comprising: if the first voltage value and the second voltage value are that positive voltage, the current value are
Zero, then continue the pre-charge process；If the first voltage value is positive voltage, the second voltage value is zero, the electric current
Value is zero, then judges the second main switch part abnormal disconnection.
The beneficial effect of the present invention compared with prior art is:
The present invention connects current sensor with the first main switch part, and with the branch of connecting of preliminary filling resistance and preliminary filling switchs part
Road is in parallel, the curent change detected by current sensor, in conjunction with the voltage between preliminary filling switchs part and preliminary filling resistance and surely
Determine the voltage at capacitor both ends, the state of each switch member in pre-charge circuit can be gone out with Accurate Diagnosis；And it is real during driving
When diagnose, it is ensured that circuit safety；And circuit structure is succinctly easily realized, does not increase Material Cost, diagnoses process rapid and convenient.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.It should be evident that the accompanying drawings in the following description is only the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 shows the structural schematic diagram of traditional pre-charge circuit in the prior art；
Fig. 2 shows the structural schematic diagrams of pre-charge circuit a kind of in the embodiment of the present invention；
Fig. 3 shows the structural schematic diagram of another pre-charge circuit in the embodiment of the present invention；
Fig. 4 shows a kind of flow diagram of the method for diagnosing faults of pre-charge circuit in the embodiment of the present invention；
Fig. 5 shows a kind of flow diagram of the driving method of pre-charge circuit in the embodiment of the present invention.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein.On the contrary, thesing embodiments are provided so that the present invention will
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.It is identical attached in figure
Icon note indicates same or similar structure, thus will omit repetition thereof.
Fig. 2 shows the structures of pre-charge circuit a kind of in embodiment originally to apply the pre- of the electric car of example referring to shown in Fig. 2
Charging circuit includes:
Battery module A21 has opposite polarity first electrode 211 and second electrode 212.Fig. 2 shows in the present embodiment
First electrode 211 is the positive electrode of battery module A21, and second electrode 212 is the negative electrode of battery module A21, but not as
Limit.In some embodiments, battery module A21 may include concatenated multiple battery modules, battery module A21 as shown in Figure 2
Including concatenated two battery modules BT, but not limited to this.Each battery modules BT may include concatenated multiple battery lists
Body, each battery modules BT as shown in Figure 2 includes concatenated two battery cells, and but not limited to this.
Concatenated first main switch part K22 and current sensor MT23, i.e. the first main switch part K22 and current sensor
MT23 forms a series arm.In some embodiments, the first main switch part K22 may include one or more switch elements,
Switch element can be any one of relay, contactor, electronic switch, air switch.Fig. 2 shows the first main switch parts
K22 is a relay, and but not limited to this, and the first main switch part K22 can also be that one or one group any type of is opened
Close element.In some embodiments, current sensor MT23 is Hall sensor or shunts sensor, and but not limited to this, electricity
Flow sensor MT23 is also possible to any sensor that can measure electric current.
Concatenated preliminary filling switchs part K24 and preliminary filling resistance R25, i.e. preliminary filling switchs part K24 and preliminary filling resistance R25 are formed a string
Join branch.In some embodiments, preliminary filling switchs part K24 may include one or more switch elements, and switch element can be
Any one of relay, contactor, electronic switch, air switch.It is a relay Fig. 2 shows preliminary filling switchs part K24, but
It is not limited, preliminary filling switchs part K24 can also be one or one group of any type of switch element.Preliminary filling resistance R25's
Resistance value is larger, to limit the electric current in powered on moment circuit.
Further, the first main switch part K22 and current sensor MT23 composition series arm and preliminary filling switchs part K24 and
The series arm of preliminary filling resistance R25 composition is in parallel.Specifically, preliminary filling switchs part K24 and the first main switch part K22 are parallel to one
First node N1, first node N1 are connected to first electrode 211.When first electrode 211 is the positive electrode of battery module A21
When, the first main switch part K22, that is, pre-charge circuit positive switch member of master.Preliminary filling resistance R25 and current sensor MT23 are parallel to
One second node N2.
Stabilization capacitor C26 in parallel and load (only being illustrated in figure for the connector 4 with load connection), stablize capacitor
C26 and load are parallel between second node N2 and a third node N3.Stablizing capacitor C26 is a kind of safety capacitor, specifically X
Capacitor is connected across between the two poles of the earth of battery module A21, can be played the role of power filter, be stabilized the output voltage.Load is electricity
The filtered burning voltage of capacitor C26 is stablized in high voltage electric device in electrical automobile, reception.
Second main switch part K27, is connected between second electrode 212 and third node N3.When second electrode 212 is battery
When the negative electrode of modules A 21, the second main switch part K27, that is, pre-charge circuit negative switch member of master.In some embodiments, second
Main switch part K27 may include one or more switch elements, and switch element can be relay, contactor, electronic switch, sky
Any one of air cock.It is a relay Fig. 2 shows the second main switch part K27, but not limited to this, the second main switch part
K27 can also be one or one group of any type of switch element.
The present embodiment connects current sensor MT23 with the first main switch part K22, and with preliminary filling switchs part K24 and preliminary filling
The series arm of resistance R25 composition is in parallel, the curent change detected by current sensor MT23, in conjunction with preliminary filling switchs part K24
The voltage of voltage and the stable both ends capacitor C26 between preliminary filling resistance R25, can be gone out each in pre-charge circuit with Accurate Diagnosis
The state of a switch member；And circuit structure is succinctly easily realized, does not increase Material Cost.
Further, battery module A21 further includes a third switch F, is connected between two adjacent battery modules BT.It should
When third switch F can be used for repairing, disconnects to cut off battery module A21, avoid getting an electric shock.It (including is examined in pre-charge circuit running
Disconnected and driving) when, third switch F closure makes battery module A21 normal power supply.
In the initial state, each switch member (including the first main switch part K22, preliminary filling switchs part K24 and the second main switch
Part K27) it is in off-state.The method for diagnosing faults of the pre-charge circuit of electric car shown in Fig. 2 is referring to shown in Fig. 4, packet
It includes:
The first voltage value between S402, monitoring preliminary filling switchs part K24 and preliminary filling resistance R25 (is denoted as VK24R25), stablize electricity
The second voltage value for holding the both ends C26 (is denoted as VC26) and the current value of current sensor MT23 (be denoted as AMT23).Wherein, preliminary filling
The first voltage value V between switch member K24 and preliminary filling resistance R25K24R25It can be monitored by a voltage detector, stablize capacitor
The second voltage value V at the both ends C26C26It can also be monitored by a voltage detector, the current value A of current sensor MT23MT23It is i.e. electric
The current value that flow sensor MT23 is monitored.
S404, closure signal is sent to preliminary filling switchs part K24 and/or the second main switch part K27.Because each switch member is first
It is in an off state under beginning state, therefore the present embodiment is only referred to and being opened to the master of preliminary filling switchs part K24 and/or second in statement
It closes part K27 and sends closure signal.In fact, being equivalent to if only sending closure signal to preliminary filling switchs part K24 to preliminary filling switchs
Part K24 sends closure signal (preliminary filling switchs part K24 is driven to switch to closed state from initial off-state) and opens to the second master
It closes part K27 and sends cut-off signal (even if the second main switch part K27 keeps initial off-state)；If only to the second main switch part
K27 sends closure signal, then is equivalent to the second main switch part K27 transmission closure signal and (drives the second main switch part K27 by first
The off-state of beginning switchs to closed state) and cut-off signal is sent (even if preliminary filling switchs part K24 is kept to preliminary filling switchs part K24
Initial off-state).In addition, before fault diagnosis starts, it is necessary first to cut-off signal is sent to the first main switch part K22,
Ensure that the branch of the first main switch part K22 will not be switched on.
S406, according to the first voltage value VK24R25, second voltage value VC26With current value AMT23, diagnose the first main switch part
The state of K22, preliminary filling switchs part K24 and the second main switch part K27.Referring to the following table 1:
The diagnostic state table of each switch member in table 1- embodiment illustrated in fig. 2
Under the first input signal, in correspondence 1 serial number of table 1., not to preliminary filling switchs part K24 and the second main switch part K27
Closure signal is sent, preliminary filling switchs part K24 and the second main switch part K27 is made to keep initial (disconnection) state.If monitoring first
Voltage value VK24R25, second voltage value VC26With current value AMT23It is zero, then can determine that preliminary filling switchs part K24 and the second main switch
Part K27 is in off-state, and preliminary filling switchs part K24 and the second main switch part K27 state are normal.Certainly it also can determine that the at this time
One main switch part K22 is in an off state, and the first main switch part K22 state is normal.If the first voltage value VK24R25For positive voltage,
Second voltage value VC26It is zero, current value AMT23It is zero, then judges the first main switch part K22 adhesion, the first main switch part K22 event
Barrier.Preliminary filling switchs part K24 and the second main switch part K27 are in an off state at this time, preliminary filling switchs part K24 and the second main switch part
K27 state is normal.It is subsequent that the normal switch member of state unlisted in upper table 1 is not repeated to illustrate.
Under second of input signal, in correspondence 2. 1 serial number of table, only sends closure signal to preliminary filling switchs part K24, makes pre-
Switch member K24 closure is filled, the second main switch part K27 keeps initial (disconnection) state.If monitoring the first voltage value VK24R25It is positive
Voltage, second voltage value VC26It is zero, current value AMT23It is zero, then can determine that preliminary filling switchs part K24 is in closed state, preliminary filling
Switch member K24 state is normal.If monitoring the first voltage value VK24R25With second voltage value VC26It is positive voltage, current value AMT23
It is zero, then judges the second main switch part K27 adhesion, the second main switch part K27 failure.If monitoring the first voltage value VK24R25With
Second voltage value VC26It is zero, current value AMT23It is zero, then judges preliminary filling switchs part K24 abnormal disconnection, preliminary filling switchs part
K24 failure.
Under the third input signal, in correspondence 3. 1 serial number of table, only sends closure signal to the second main switch part K27, makes
Second main switch part K27 closure, preliminary filling switchs part K24 keep initial (disconnection) state.If monitoring the first voltage value VK24R25With
Second voltage value VC26It is zero, current value AMT23It is zero, then judges that the second main switch part K27 is closed, the second main switch part K27
State is normal.If monitoring the first voltage value VK24R25With second voltage value VC26It is positive voltage, current value AMT23For positive current,
Then judge the first main switch part K22 adhesion, the first main switch part K22 failure.If monitoring the first voltage value VK24R25With the second electricity
Pressure value VC26It is positive voltage, current value AMT23It is zero, then judges preliminary filling switchs part K24 adhesion, preliminary filling switchs part K24 failure.
Under the 4th kind of input signal, in correspondence 4. 1 serial number of table, is sent out to preliminary filling switchs part K24 and the second main switch part K27
Closure signal is sent, is closed preliminary filling switchs part K24 and the second main switch part K27, certain first main switch part K22 is still kept just
Begin (disconnection) state, and the first main switch part K22 keeps initial (disconnection) shape under aforementioned first to the third input signal
State.If monitoring the first voltage value VK24R25With second voltage value VC26It is positive voltage, current value AMT23It is zero, then determines preliminary filling
Switch member K24 and the second main switch part K27 is in closed state, and preliminary filling switchs part K24 and the second main switch part K27 state are just
Often, pre-charge circuit normal pre-charge at this time.If monitoring the first voltage value VK24R25For positive voltage, second voltage value VC26Be zero,
Current value AMT23It is zero, then judges the second main switch part K27 abnormal disconnection, the second main switch part K27 failure.
Whole diagnosis processes is not listed in upper table 1, remaining is defeated to preliminary filling switchs part K24/ the second main switch part K27
Enter closure signal, according to the first voltage value V monitoredK24R25, second voltage value VC26With current value AMT23The first master of diagnosis opens
The process for closing the state of part K22, preliminary filling switchs part K24 and the second main switch part K27 can refer to above-mentioned discussion, be not repeated herein
Explanation.Out of order switch member is arbitrarily diagnosed to above-mentioned, can be repaired before being put into use.
Method for diagnosing faults of the invention passes through the first voltage between monitoring preliminary filling switchs part K24 and preliminary filling resistance R25
Value VK24R25, stablize the both ends capacitor C26 second voltage value VC26And the current value A of current sensor MT23MT23, and cooperate pre-
The input signal for filling switch member K24/ the second main switch part K27 changes, and can easily realize each switch member in pre-charge circuit
Diagnosis, rapid and convenient do not increase Diagnostic Time.
Fig. 5 shows the driving method of pre-charge circuit shown in Fig. 2, and the driving of pre-charge circuit can be laggard in fault diagnosis
Row, to ensure circuit safety.Referring to Figure 5, driving method includes:
S502, successively to the second main switch part K27 and preliminary filling switchs part K24 closure signal is sent, makes the second main switch part
K27 and preliminary filling switchs part K24 are in turn switched on, and driving pre-charge circuit enters pre-charge process.In pre-charge process, battery module
A21 charges through circuit where preliminary filling switchs part K24 and preliminary filling resistance R25 to capacitor C26 is stablized.
S504, in pre-charge process, monitor simultaneously according between preliminary filling switchs part K24 and preliminary filling resistance R25 first electricity
Pressure value VK24R25, stablize the both ends capacitor C26 second voltage value VC26With the current value A of current sensor MT23MT23, diagnosis first
The state of main switch part K22, preliminary filling switchs part K24 and the second main switch part K27, stop being pre-charged if either switch part failure
Process.
In some embodiments, the shape of the first main switch part K22, preliminary filling switchs part K24 and the second main switch part K27 are diagnosed
State, comprising: if the first voltage value VK24R25With second voltage value VC26It is positive voltage, current value AMT23It is zero, then judges first
Main switch part K22, preliminary filling switchs part K24 and the second main switch part K27 state are normal, continue pre-charge process.If first voltage
Value VK24R25For positive voltage, second voltage value VC26It is zero, current value AMT23It is zero, then judges that the second main switch part K27 is improper
It disconnects, the second main switch part K27 failure, stops pre-charge process.The diagnosis process of remaining state can refer to above-mentioned fault diagnosis
The discussion of embodiment is not repeated to illustrate herein.Stop pre-charge process can be by opening to the master of preliminary filling switchs part K24 and second
It closes part K27 and sends cut-off signal, cut off preliminary filling switchs part K24 and the second main switch part K27.Further, stop being pre-charged
Cheng Hou can cut off third switch F, to repairing at failure.
S506, terminate when pre-charge process, send closure signal to the first main switch part K22, sent out to preliminary filling switchs part K24
Cut-off signal is sent, connects the first main switch part K22, preliminary filling switchs part K24 cutting, driving pre-charge circuit conveys electricity to load
Pressure.The end of pre-charge process can be depending on configuration, for example, being equal to when the charging voltage for stablizing capacitor C26 is higher and higher
Or close to battery module A21 cell voltage when, then cut off preliminary filling switchs part K24, complete pre-charge process, and it is main to connect first
Switch member K22 makes battery module A21 power to the load by circuit where the first main switch part K22.
The state that driving method of the invention passes through each switch member of real-time diagnosis in pre-charge process, it is ensured that circuit peace
Entirely.At the end of loading electricity consumption, then cut-off signal successively is sent to the first main switch part K22 and the second main switch part K27, makes the
One main switch part K22 and the second main switch part K27 are successively cut off.
Fig. 3 shows the structure of pre-charge circuit in another embodiment.In embodiment shown in Fig. 3, pre-charge circuit is same
Including battery module A21, concatenated first main switch part K22 and current sensor MT23, concatenated preliminary filling switchs part K24 and pre-
Charging resistance R25, stabilization capacitor C26 and the primary circuit elements such as load and the second main switch part K27 in parallel.Battery module
A21 has opposite polarity first electrode 211 and second electrode 212；First main switch part K22 and current sensor MT23 composition
Series arm and preliminary filling switchs part K24 and the series arm that forms of preliminary filling resistance R25 it is in parallel, specifically preliminary filling switchs part K24
It is parallel to a first node N1 with the first main switch part K22, first node N1 is connected to first electrode 211, preliminary filling resistance R25
A second node N2 is parallel to current sensor MT23；Stablize capacitor C26 and load is parallel to second node N2 and a third
Between node N3；Second main switch part K27 is connected between second electrode 212 and third node N3.
The difference is that, first electrode 211 is battery module A21 in embodiment illustrated in fig. 3 with embodiment illustrated in fig. 2
Negative electrode, second electrode 212 is the positive electrode of battery module A21.Then accordingly, the first main switch part K22 is precharge electricity
The negative switch member of the master on road, the second main switch part K27 are the positive switch members of master of pre-charge circuit.In addition to this, precharge shown in Fig. 3
The structure of circuit and the structure of each circuit element with pre-charge circuit shown in Fig. 2 similarly, therefore be not repeated to illustrate.
The pre-charge circuit of the present embodiment be also current sensor MT23 is connected with the first main switch part K22, and with it is pre-
The series arm for filling switch member K24 and preliminary filling resistance R25 composition is in parallel, the curent change detected by current sensor MT23,
In conjunction with the voltage of voltage and the stable both ends capacitor C26 between preliminary filling switchs part K24 and preliminary filling resistance R25, can accurately examine
The state of each switch member in disconnected pre-charge circuit out；And circuit structure is succinctly easily realized, does not increase Material Cost.
In the initial state, each switch member (including the first main switch part K22, preliminary filling switchs part K24 and the second main switch
Part K27) it is in off-state.The method for diagnosing faults of the pre-charge circuit of electric car shown in Fig. 3 is referring again to Fig. 4 institute
Show, comprising:
The first voltage value V between S402, monitoring preliminary filling switchs part K24 and preliminary filling resistance R25K24R25, stablize capacitor C26
The second voltage value V at both endsC26And the current value A of current sensor MT23MT23.S402 can when S404 is not carried out prison
It surveys, can also be monitored after S404 execution.
S404, closure signal is sent to preliminary filling switchs part K24 and/or the second main switch part K27, drives preliminary filling switchs part
K24 closure and the second main switch part K27 are disconnected or the second main switch part K27 is closed and preliminary filling switchs part K24 is disconnected or preliminary filling
Switch member K24 and the second main switch part K27 are closed.Certainly, as previously mentioned, in entire failure diagnostic process, the first master is opened
It closes part K22 to disconnect, it is ensured that branch where it is not switched on.
S406, according to the first voltage value VK24R25, second voltage value VC26With current value AMT23, diagnose the first main switch part
The state of K22, preliminary filling switchs part K24 and the second main switch part K27.Referring to the following table 2:
The diagnostic state table of each switch member in table 2- embodiment illustrated in fig. 3
Similarly, specific diagnosis process can refer to above-described embodiment discussion, herein no longer for the diagnostic state of the table 2 and upper table 1
Repeated explanation.Certainly, table 2 does not also list whole diagnosis processes, remaining is to preliminary filling switchs part K24/ the second main switch part K27
Closure signal is inputted, according to the first voltage value V monitoredK24R25, second voltage value VC26With current value AMT23Diagnosis first is main
The process of the state of switch member K22, preliminary filling switchs part K24 and the second main switch part K27 can refer to above-mentioned discussion, be not repeated
It is bright.
The present embodiment is also by the first voltage value V between monitoring preliminary filling switchs part K24 and preliminary filling resistance R25K24R25, it is steady
Determine the second voltage value V at the both ends capacitor C26C26And the current value A of current sensor MT23MT23, and cooperate preliminary filling switchs part
The input signal of K24/ the second main switch part K27 changes, and realizes the Accurate Diagnosis of the state of each switch member in pre-charge circuit,
Rapid and convenient.
For the driving method of pre-charge circuit shown in Fig. 3 referring again to shown in Fig. 5, the driving of the pre-charge circuit can also be
It is carried out after fault diagnosis, to ensure circuit safety.Driving method includes:
S502, successively to the second main switch part K27 and preliminary filling switchs part K24 closure signal is sent, makes the second main switch part
K27 and preliminary filling switchs part K24 are in turn switched on, and driving pre-charge circuit enters pre-charge process.
S504, in pre-charge process, monitor simultaneously according between preliminary filling switchs part K24 and preliminary filling resistance R25 first electricity
Pressure value VK24R25, stablize the both ends capacitor C26 second voltage value VC26With the current value A of current sensor MT23MT23, diagnosis first
The state of main switch part K22, preliminary filling switchs part K24 and the second main switch part K27, stop being pre-charged if either switch part failure
Process.The detailed process for diagnosing the state of the first main switch part K22, preliminary filling switchs part K24 and the second main switch part K27 can refer to
Above-mentioned discussion is not repeated to illustrate herein.
S506, terminate when pre-charge process, send closure signal to the first main switch part K22, sent out to preliminary filling switchs part K24
Cut-off signal is sent, connects the first main switch part K22, preliminary filling switchs part K24 cutting, driving pre-charge circuit conveys electricity to load
Pressure.
The state of each switch member of real-time diagnosis in pre-charge process also may be implemented in the pre-charge circuit of the present embodiment,
Ensure circuit safety.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (13)
1. a kind of pre-charge circuit of electric car characterized by comprising
Battery module has opposite polarity first electrode and second electrode；
Concatenated first main switch part and current sensor；
Concatenated preliminary filling switchs part and preliminary filling resistance, the preliminary filling switchs part and the first main switch part are parallel to a first segment
Point, the first node are connected to the first electrode, and the preliminary filling resistance and the current sensor are parallel to one second section
Point；
Stabilization capacitor and load in parallel, the stable capacitor and the load are parallel to the second node and a third node
Between；And
Second main switch part is connected between the second electrode and the third node.
2. pre-charge circuit as described in claim 1, which is characterized in that the first electrode is the positive electricity of the battery module
Pole, the second electrode are the negative electrodes of the battery module；Or
The first electrode is the negative electrode of the battery module, and the second electrode is the positive electrode of the battery module.
3. pre-charge circuit as described in claim 1, which is characterized in that the battery module includes concatenated multiple battery moulds
Group, the battery modules include concatenated multiple battery cells.
4. pre-charge circuit as claimed in claim 3, which is characterized in that further include third switch, be connected to adjacent two
Between battery modules.
5. pre-charge circuit as described in claim 1, which is characterized in that the first main switch part, the preliminary filling switchs part,
The second main switch part respectively includes one or more switch elements, and the switch element is relay, contactor, electronic cutting
Any one of pass, air switch.
6. pre-charge circuit as described in claim 1, which is characterized in that the current sensor is Hall sensor or shunting
Sensor.
7. a kind of method for diagnosing faults, applied to the pre-charge circuit of electric car as claimed in any one of claims 1 to 6,
It is characterized in that, the method for diagnosing faults includes:
Monitor the second electricity of the first voltage value between the preliminary filling switchs part and the preliminary filling resistance, the stable capacitor both ends
The current value of pressure value and the current sensor；
Closure signal is sent to the preliminary filling switchs part and/or the second main switch part；
According to the first voltage value, the second voltage value and the current value, the first main switch part, described pre- is diagnosed
Fill the state of switch member and the second main switch part.
8. method for diagnosing faults as claimed in claim 7, which is characterized in that when the preliminary filling switchs part and second master are opened
When pass part is not closed, if the first voltage value is positive voltage, the second voltage value is zero, the current value is zero,
Judge the first main switch part adhesion.
9. method for diagnosing faults as claimed in claim 7, which is characterized in that believe when only sending closure to the preliminary filling switchs part
Number when,
If it is zero that the first voltage value and the second voltage value, which are positive voltage, the current value, described second is judged
Main switch part adhesion；
If the first voltage value and the second voltage value are that the zero, current value is zero, the preliminary filling switchs are judged
Part abnormal disconnection.
10. method for diagnosing faults as claimed in claim 7, which is characterized in that closed when only being sent to the second main switch part
When closing signal,
If the first voltage value and the second voltage value be positive voltage, the current value be positive current, judgement described in
First main switch part adhesion；
If it is zero that the first voltage value and the second voltage value, which are positive voltage, the current value, the preliminary filling is judged
Switch member adhesion.
11. method for diagnosing faults as claimed in claim 7, which is characterized in that when to the preliminary filling switchs part and described second
When main switch part sends closure signal, if the first voltage value is positive voltage, the second voltage value is zero, the current value
It is zero, then judges the second main switch part abnormal disconnection.
12. a kind of driving method, special applied to the pre-charge circuit of electric car as claimed in any one of claims 1 to 6
Sign is that the driving method includes:
Closure signal successively is sent to the second main switch part and the preliminary filling switchs part, the pre-charge circuit is driven to enter
Pre-charge process；
In the pre-charge process, monitor and according to the first voltage between the preliminary filling switchs part and the preliminary filling resistance
The current value of value, the second voltage value at the stable capacitor both ends and the current sensor, diagnosis the first main switch part,
The state of the preliminary filling switchs part and the second main switch part stops the pre-charge process if either switch part failure；
When the pre-charge process terminates, Xiang Suoshu the first main switch part sends closure signal, and Xiang Suoshu preliminary filling switchs part is sent
Cut-off signal drives the pre-charge circuit to convey voltage to the load.
13. driving method as claimed in claim 12, which is characterized in that diagnosis the first main switch part, the preliminary filling are opened
Close the state of part and the second main switch part, comprising:
If it is zero that the first voltage value and the second voltage value, which are positive voltage, the current value, continue the preliminary filling
Electric process；
If the first voltage value is positive voltage, the second voltage value is zero, the current value is zero, described second is judged
Main switch part abnormal disconnection.
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