CN105988082B - The relay status detection method and device of electric automobile high-voltage system - Google Patents
The relay status detection method and device of electric automobile high-voltage system Download PDFInfo
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Abstract
A kind of relay status detection method and device of electric automobile high-voltage system, method include: voltage of the A point to the voltage of G point, B point to the voltage of G point and C point to G point when acquiring under electric car main positive relay, main negative relay and pre-charge-relay in electric process while receiving and executing open command；According to the A point in lower electric process to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point judge main negative relay whether adhesion, judge to lead positive relay or pre-charge-relay whether adhesion；Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, and the C point indicates the connecting pin of main negative relay and load, and the G point indicates the cathode of power supply.This programme may be implemented the relay status in vehicle promptly lower electricity and judge.
Description
Technical field
The present invention relates to electric vehicle engineering fields, more particularly to a kind of relay status of electric automobile high-voltage system
Detection method and device.
Background technique
DC power relay state-detection in electric automobile high-voltage system, be realize electric car power on safely, lower electricity
Important technology.Electric automobile high-voltage components are more, in actual moving process, when short-circuit failure occurs in components load
When or full-vehicle control timing Design it is unreasonable, high current can be generated on power line leads to relay adhesion, in order to rise safely
See, electric car power on and lower electric process in, it is necessary to relay status is detected.
The DC power relay detected from contact-carrying is at high cost, and the problem of due to production technology, passes through in practical application
Often there is the case where erroneous judgement relay status.Relay status is detected using lower electric current journey detection method in tradition.Battery
Management system (BATTERY MANAGEMENT SYSTEM, BMS) enter lower electric current journey, whether declined according to busbar voltage, whether
Rising judge preliminary filling or main positive relay whether adhesion, lead negative relay whether adhesion.Using lower electric current journey detection method to relay
When device state is detected, when highest level failure occurs in vehicle, vehicle meeting failure is promptly lower electric, and it is same that master is just leading negative relay
When disconnect, relay status can not be detected.When urgent lower electricity occurs, relay meeting band carries cutting, in fact it could happen that adhesion situation.
The non-meter relay adhesion state of BMS is possible to meeting on power bus when vehicle powers on again when due to upper less urgent lower electricity
There is high current, damages high pressure part.
Summary of the invention
Based on this, it is necessary to which relay status judges when can not solve the problems, such as vehicle in urgent lower electricity, provides one
The relay status detection method and device of kind electric automobile high-voltage system.
A kind of relay status detection method of electric automobile high-voltage system, the power sources in parallel of electric automobile high-voltage system have
For detecting the first voltage Sampling device of voltage；The outer end of the positive relay of the master of electric automobile high-voltage system and power cathode it
Between be connected with second voltage Sampling device for detecting voltage；The negative relay parallel connection of the master of electric automobile high-voltage system is useful
In the tertiary voltage Sampling device of detection voltage；The connecting pin of positive relay and load based on the outer end of the positive relay of master；
Described method includes following steps:
Main positive relay, main negative relay and pre-charge-relay are received and are held simultaneously in electric process under acquisition electric car
When row open command A point to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
It is main negative to the voltage judgement of G point to the voltage and C point of G point according to voltage, B point of the A point in lower electric process to G point
Relay whether adhesion, judge to lead positive relay or pre-charge-relay whether adhesion；
Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, the C
Point indicates the connecting pin of main negative relay and load, and the G point indicates the cathode of power supply.
A kind of relay status detection device of electric automobile high-voltage system, including telecommunication circuit is isolated, is set to higher-pressure region
First voltage Sampling device, second voltage Sampling device, tertiary voltage Sampling device, the first filter circuit, the second filtered electrical
Road, third filter circuit and modulus sample circuit and the microcontroller set on low-pressure area；
The first voltage Sampling device is connect with the power sources in parallel of electric automobile high-voltage system；The second voltage sampling
Device one end is connect with the outer end of the positive relay of the master of electric automobile high-voltage system, the second voltage Sampling device other end with
The cathode of the power supply connects；Tertiary voltage Sampling device and the negative relay of master of electric automobile high-voltage system are connected in parallel；The
One filter circuit is connect with first voltage Sampling device, and the second filter circuit is connect with second voltage Sampling device, third filtering
Circuit is connect with tertiary voltage Sampling device；First filter circuit, the second filter circuit, third filter circuit are adopted with modulus respectively
Sample circuit connection, modulus sample circuit are connect by the way that telecommunication circuit is isolated with microcontroller；
The microcontroller for acquire under electric car main positive relay in electric process, main negative relay and precharge after
Electric appliance simultaneously when receiving and executing open command A point to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；Root
Main negative relay is judged whether to the voltage of G point to the voltage and C point of G point according to voltage, B point of the A point in lower electric process to G point
Adhesion, judge to lead positive relay or pre-charge-relay whether adhesion；
Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, the C
Point indicates the connecting pin of main negative relay and load, and the G point indicates the cathode of power supply, and the outer end of the positive relay of master is
The connecting pin of main positive relay and load.
The relay status detection method and device of above-mentioned electric automobile high-voltage system pass through electric mistake under acquisition electric car
Electricity of the A point to G point when the positive relay of Cheng Zhongzhu, main negative relay and pre-charge-relay receive simultaneously and execute open command
Pressure, B point are to the voltage of G point and C point to the voltage of G point；And according to the main positive relay of the voltage of acquisition judgement or precharge relay
Device whether adhesion, judge main negative relay whether adhesion.The relay status in vehicle promptly lower electricity may be implemented to judge.And
And telecommunication circuit only need to be isolated all the way in device, greatly reduce cost.
Detailed description of the invention
Fig. 1 is the electric automobile high-voltage system structure diagram that the present invention is equipped with Sampling device；
Fig. 2 is the flow diagram of the relay status detection method embodiment of electric automobile high-voltage system of the present invention；
Fig. 3 is present invention electric automobile high-voltage system structure diagram to be measured in one embodiment；
Fig. 4 is the structural schematic diagram of the relay status detection device embodiment one of electric automobile high-voltage system of the present invention；
Fig. 5 is the structural schematic diagram of the relay status detection device embodiment two of electric automobile high-voltage system of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The relay status detection method of electric automobile high-voltage system provided by the embodiment of the present invention can be applied to such as
Electric automobile high-voltage system shown in FIG. 1 carries out relay status detection, please refers to shown in Fig. 1, is equipped with sampler for the present invention
The electric automobile high-voltage system structure diagram of part.Electric automobile high-voltage system includes: power supply 110, main positive relay 120, bears
Carry 130 and main negative relay 140, pre-charge-relay 150, pre-charge resistance 160；The anode of the power supply 110 with it is main just after
The first end of electric appliance 120 connects, and the second end of the positive relay 120 of master passes through load 130 and the first of main negative relay 140
The second end of end connection, main negative relay 140 is connect with the cathode of power supply 110；Concatenated pre-charge-relay 150 and preliminary filling
Resistance 160 is connected in parallel with main positive relay 120.Wherein, the second end of main positive relay is properly termed as leading positive relay again
The outer end connecting pin of relay and load (main positive).The first end of main negative relay is properly termed as leading the outer end of negative relay again
(connecting pin of main negative relay and load).Load may include motor, controller, high-pressure air conditioner of electric car etc., be band
The load of dc-link capacitance.
Further, first voltage Sampling device 170, second voltage Sampling device are set in electric automobile high-voltage system
180 and tertiary voltage Sampling device 190.The first voltage Sampling device 170 is connected in parallel with the power supply 110；Described
Two voltage sample devices, 180 one end is connect with the second end (outer end) of main positive relay 120, and second Sampling device 180 is another
One end is connect with 110 cathode of power supply；Third Sampling device 190 is connected in parallel with main negative relay 140.
As shown in Fig. 2, a kind of flow diagram of the relay status detection method of electric automobile high-voltage system is provided,
Comprising steps of
Step S201: main positive relay, main negative relay and pre-charge-relay are same in electric process under acquisition electric car
When receiving and executing open command A point to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
The A point of acquisition to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point can be main positive relay,
After main negative relay and pre-charge-relay receive simultaneously and execute open command, the voltage that is acquired after preset time.In advance
If the time is set as needed, for example can be set to 100ms.
Step S202: according to the A point in lower electric process to the voltage of G point, B point to the voltage of G point and C point to the electricity of G point
Pressure judge to lead negative relay whether adhesion, judge to lead positive relay or pre-charge-relay whether adhesion；
Wherein, the A point indicates that the anode of power supply, the B point indicate that leading positive relay and the connecting pin of load (leads just
The outer end of relay), the C point indicates the connecting pin (leading the outer end of negative relay) of main negative relay and load, the G point
Indicate the cathode of power supply.When main positive relay, main negative relay and pre-charge-relay are received and are executed instruction, it is possible to execute
Success, it is possible to execute failure.This method can be used for detecting whether running succeeded.
The present embodiment point on the basis of G point passes through main positive relay, main negative relay in electric process under acquisition electric car
When receiving simultaneously with pre-charge-relay and execute open command A point to the voltage of G point, B point to the voltage and C point of G point to G
The voltage of point；And according to the voltage of acquisition judge main positive relay or pre-charge-relay whether adhesion, the main negative relay of judgement
Whether adhesion.The relay status in vehicle promptly lower electricity may be implemented to judge.
Further, step S202 includes:
A1: to VA0、VB0、VC0Judged；
Wherein, VA0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute open command
When voltage of the A point to G point, VB0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute disconnection
Voltage of the B point to G point, VC when instruction0Indicate that main positive relay, main negative relay and pre-charge-relay are received and executed simultaneously
Voltage of the C point to G point when open command.
This step is a judgment step, for example, judging whether to meet VA0-VB0> k0*VA0And-k0*VA0< VC0< 0；
Judge whether to meet VA0=VB0And VC0=0；Judge whether to meet VC0=0 and VB0< VA0；Judge whether to meet VA0=VB0And
VC0> 0.
A2: if VA0-VB0> k0*VA0And-k0*VA0< VC0< 0,When, main positive relay, main negative relay
Device, preliminary filling relay are normal simultaneously to be disconnected；
A3: if VA0=VB0And VC0=0, then it leads positive relay or pre-charge-relay adhesion and main negative relay is viscous
Even；
A4: if VC0=0 and VB0< VA0, then it leads positive relay and normally disconnects, main negative relay adhesion；
A5: if VA0=VB0And VC0> 0 then leads positive relay or pre-charge-relay adhesion, the main negative positive normal off of relay
It opens.
The present embodiment specifically describe it is a kind of judge main positive relay or pre-charge-relay whether adhesion, judge it is main it is negative after
Electric appliance whether the method for adhesion, judgement when may be implemented under automobile emergency electric by this judgment method to relay status.
It in one of the embodiments, further include the detection that relay status is carried out in electric car power up, i.e.,
Under electric car it is electrically operated before, further includes:
At most two relays receive in main positive relay, main negative relay and pre-charge-relay in acquisition power up
And A point when executing close command to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
According to A point in power up it is main to the voltage judgement of G point to the voltage and C point of G point to the voltage of G point, B point just after
Electric appliance or pre-charge-relay whether adhesion, judge main negative relay whether adhesion.
By taking into account the power-on and power-off management process of automobile, may be implemented to judge relay status when vehicle is promptly lower electric.
Specifically, in acquisition power up in main positive relay, main negative relay and pre-charge-relay at most two after
A point when electric appliance receives and executes close command is to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；According to
A point judges main positive relay or precharge to the voltage of G point to the voltage and C point of G point to voltage, the B point of G point in power up
Relay whether adhesion, judge main negative relay whether adhesion step, comprising:
B1: main positive relay in power up, main negative relay and pre-charge-relay are obtained and receives and executes disconnection
VA when instruction1And VB1；Judge VA1Whether VB is equal to1, if so, main positive relay adhesion or preliminary filling relay adhesion, terminate
Judgement in power up；If it is not, judging VA1-VB1> k1*VA1Whether meet,
It before this step terminates the judgment step in power up, can also alarm the failure, event can also be reported
Hinder information.
As it is possible that electric discharge completely, load terminal voltage maximum are no more than VA not yet for load1, at this time VC1It is negative electricity
Pressure, then meet VA1-VB1> k1*VA1Shi Caike is powered on.Wherein, VC is indicated1Indicate main positive relay in power up, it is main it is negative after
The voltage of C point when electric appliance and pre-charge-relay receive and execute open command to G point.For example, VC at this time1It is negative voltage
(- 1/2 load voltage).VCapacitorIndicate capacitance voltage, as long as soIt can power on
?.
B2: if satisfied, then sending close command to pre-charge-relay, VA is obtained in the first preset time2、VB2；
First preset time can according to the relay closed action time, voltage hardware detecting circuit read voltage time,
Software reads voltage time and obtains, for example, it may be 60ms.
B3: if VA2≠VB2, it is spaced the second preset time, obtains and judges that A point is to G point after being spaced the second preset time
Whether voltage and B point are equal to the voltage of G point, if so, main negative relay adhesion, terminates the judgement in power up, if it is not,
Then pre-charge-relay is not attracted, terminates the judgement in power up.
Wherein, VA1And VB1Main positive relay in power up, main negative relay and pre-charge-relay is respectively indicated to receive
To and A point when executing open command to the voltage of G point and B point to the voltage of G point；VA2、VB2Be illustrated respectively in first it is default when
The A point of interior acquisition is to the voltage of G point, B point to the voltage of G point.
Second preset time is determined according to circuit precharge time, for example, can be 200ms.Determining main negative relay
When adhesion or pre-charge-relay are not attracted, early warning, reporting fault information can be carried out.
The step is a kind of detecting step in power up to relay status.VA1And VB1Other situations can not
It pays attention to.
Further, further includes:
C1: VC is obtained in the first preset time2, wherein VC2Indicate the C point obtained in the first preset time to G point
Voltage；
The step can obtain VA2、VB2When, carry out acquisition VC2。
C2: if VA2=VB2, VC2> 0 then sends open command to pre-charge-relay, while sending to the positive relay of master
Close command obtains VA after being spaced third preset time3、VB3、VC3；
VC at this time2For VA2Subtract load terminal voltage.Pre-charge-relay is normally attracted.It at this time can be to pre-charge-relay
Open command is sent, while sending close command to the positive relay of master, obtains VA after being spaced third preset time3、VB3、VC3.The
Three preset times can read voltage time according to relay closed action time, voltage hardware detecting circuit, software reads electricity
The time is pressed to obtain, for example, it may be 60ms.
C3: if VA3≠VB3, VC3≤ 0, then it leads positive relay and is not attracted, terminate the judgement in power up；
Wherein, VA3、VB3、VC3The A point that obtains after the third preset time of interval is respectively indicated to the voltage of G point, B point to G
Voltage of the voltage and C point of point to G point.
VA3≠VB3, VC3When≤0, determines that main positive relay is not attracted, early warning can be carried out, can be believed with reporting fault
Breath stops subsequent detection.
The step is the further detection in power up to relay status.VA3、VB3、VC3Other situations can not
It pays attention to.
Further, further includes:
D1: if VA3=VB3, VC3> 0 then sends open command to the positive relay of master, obtains after being spaced the 4th preset time
Take VA4And VB4；Judge VA4Whether VB is equal to4；
VA3=VB3, VC3Determine that total positive relay can be normally attracted when > 0, can be sent at this time to the positive relay of master disconnected
Instruction is opened, obtains VA after being spaced the 4th preset time4And VB4.4th preset time can according to relay disconnect actuation time,
Voltage hardware detecting circuit reads voltage time, software reads voltage time and obtains, for example, it may be 40ms.
D2: if VA4=VB4, then positive relay adhesion or preliminary filling relay adhesion are led, the judgement in power up is terminated；
Wherein, VA4And VB4The A point that obtains after the 4th preset time of interval is respectively indicated to the voltage of G point, B point to G point
Voltage.
Determine that main positive relay adhesion or the adhesion of preliminary filling relay can carry out early warning, can with reporting fault information, and
Stop detection.
Further, further includes:
E1: if VA4≠VB4, judge VA4-VB4> k4*VA4Whether meet,
E2: if meeting VA4-VB4> k4*VA4, then close command is sent to preliminary filling relay and main negative relay, interval the
VA is obtained after five preset times5、VB5And VC5；
5th preset time can be examined according to relay closed action time, automobile precharge time and voltage hardware
Slowdown monitoring circuit reads voltage time, software reads voltage time and determines.For example, can be 50ms.
E3: judge whether to meet VB5> k5*VA5And VC5=0, if it is not, main negative relay is not attracted, terminate power up
In judgement；If so, sending close command to the positive relay of master, disconnection is sent to pre-charge-relay after the 6th preset time and is referred to
It enables, completes to power on；
Wherein, VA5、VB5And VC5A point is obtained to the voltage of G point, B point to G point after respectively indicating the 5th preset time of interval
Voltage to G point of voltage and C point, k5Indicate that pre-charge pressure is charged to the percentage of total voltage.
k5It is the percentage that pre-charge pressure is charged to total voltage, is determined according to automobile precharging requirements, for example can be 0.95.
6th preset time can determine the positive relay closed action time according to master.For example, can be 50ms.If VB5> k5*VA5
And VC5When=0, main negative relay, pre-charge-relay normally closed are determined, at this point it is possible to be closed main positive relay.
The present embodiment improves Detection accuracy by the Multiple detection to relay status.
Various technical characteristics in embodiment of above can be arbitrarily combined, as long as the combination between feature is not present
Conflict or contradiction, but as space is limited, it is not described one by one, therefore the various technical characteristics in above embodiment is any
It is combined the range for also belonging to this disclosure.
This programme is enumerated one of combination and is illustrated.
The detecting step of power up:
S1: it reads when main positive relay, main negative relay and pre-charge-relay receive and execute open command
VA1、VB1、VC13 voltages, and carry out following judgement:
(1) if VA1Normally, S2 is carried out.Where it is possible to load electric discharge completely not yet, bear
It carries end voltage maximum and is no more than VA1, VC at this time1It is negative voltage (- 1/2 load voltage), as long as soIt can power on；
(2) if VA1=VB1, main positive relay or pre-charge-relay adhesion, reporting fault stop S2；
S2: close command is sent to pre-charge-relay, reads VA in 60ms2、VB2、VC23 voltages, and carry out following
Judgement:
(1) if VA2=VB2, VC2(voltage is VA to > 02Load terminal voltage), pre-charge-relay is normally attracted, and is carried out
S3；
(2) if VA2≠VB2, wait 200ms, obtain and judge be spaced 200ms after A point to the voltage and B point of G point to G point
Voltage it is whether equal, if so, main negative relay adhesion, reporting fault stop S3, if it is not, then pre-charge-relay is not inhaled
It closes, reporting fault, stops S3.
S3: open command is sent to pre-charge-relay, while sending closure to the positive relay of master, reads VA after 60ms3、
VB3、VC33 voltages, and carry out following judgement:
(1) if VA3=VB3, VC3> 0, main positive relay can be normally attracted, and carry out S4；
(2) if VA3≠VB3, lead positive relay and be not attracted, reporting fault stops S4；
S4: Xiang Zhuzheng relay sends open command, reads VA after 40ms4And VB4Point voltage, and carry out following judgement:
(1) ifMain positive relay is already off, carries out S5；
(2) if VA4=VB4, main positive relay adhesion or pre-charge-relay adhesion, reporting fault stop S5.
S5: close command is sent to pre-charge-relay and main negative relay, is pre-charged, VA is read after 50ms5、VB5
And VC53 voltages, and carry out following judgement:
(1) if VB5> 0.95*VA5(being determined according to vehicle precharging requirements), VC5=0, main negative relay, precharge after
Electric appliance normally closed carries out S6；
(2) it otherwise leads negative relay not to be attracted, report an error, stop S6.
S6: Xiang Zhuzheng relay sends close command, sends open command to pre-charge-relay after 50ms, in completion
Electricity.
The detecting step of lower electric process:
S7: main positive relay, main negative relay receive and execute simultaneously open command, and VA is read after 100ms0、VB0、
VC03 voltages, and carry out following judgement:
(1) ifThen lead positive relay, main negative relay while just
Normal off is opened；
(2) if VA0=VB0And VC0=0, then it leads positive relay or pre-charge-relay adhesion and main negative relay is viscous
Even；
(3) if VC0=0 and VB0< VA0, then it leads positive relay and normally disconnects, main negative relay adhesion；
(4) if VA0=VB0And VC0> 0 then leads positive relay or pre-charge-relay adhesion, the main negative positive normal off of relay
It opens.
The present embodiment can take into account the upper and lower electric management process of vehicle, can accomplish to judge relay when vehicle is promptly lower electric
Device state.
Based on the above method, a kind of relay status detection dress of electric automobile high-voltage system for realizing this method is also provided
It sets.The relay status detection device of electric automobile high-voltage system provided by the embodiment of the present invention can be used for detecting such as Fig. 3 institute
The electric automobile high-voltage system shown.It please refers to shown in Fig. 3, for one of them object structure schematic diagram to be detected of the invention.It is electronic
Vehicle high voltage system includes: power supply 310, main positive relay 320, load 330 and main negative relay 340, pre-charge-relay
350, pre-charge resistance 360；The anode of the power supply 310 is connect with the first end of main positive relay 320, the positive relay of master
320 second end is connect by load 330 with the first end of main negative relay 340, the second end and power supply of main negative relay 340
310 cathode connection；Concatenated pre-charge-relay 350 and pre-charge resistance 360 are connected in parallel with main positive relay 320.Its
In, the second end of main positive relay is properly termed as leading the outer end (connecting pin of main positive relay and load) of positive relay again.It is main
The first end of negative relay is properly termed as leading the outer end (connecting pin of main negative relay and load) of negative relay again.Load can be with
Motor, controller, high-pressure air conditioner including electric car etc. are the loads with dc-link capacitance.Wherein, the A point indicates
The anode of power supply, the B point indicate the outer end of main positive relay, and the C point indicates the outer end of main negative relay, the G point table
Show the cathode of power supply.
As shown in figure 4, the structure of the relay status detection device embodiment one for electric automobile high-voltage system of the present invention
Schematic diagram in Fig. 4, checks for convenience, this it is not shown go out electric automobile high-voltage system schematic.Wherein, A point indicates electronic vapour
The anode of the power supply of vehicle high-pressure system, B point indicate the positive relay of master of electric automobile high-voltage system outer end (main positive relay with
The connecting pin of load), C point indicates the outer end (company of main negative relay and load of the negative relay of master of electric automobile high-voltage system
Connect end), G point indicates the cathode of the power supply of electric automobile high-voltage system.
Detection device includes isolation telecommunication circuit 480, set on the first voltage Sampling device 410 of higher-pressure region, second voltage
Sampling device 420, tertiary voltage Sampling device 430, the first filter circuit 440, the second filter circuit 450, third filter circuit
460 and modulus sample circuit 470 and the microcontroller 490 (Micro Control Unit, MCU) set on low-pressure area；
The first voltage Sampling device 410 is connect with the power sources in parallel of electric automobile high-voltage system；The second voltage
420 one end of Sampling device is connect with the outer end of the positive relay of the master of electric automobile high-voltage system, the second voltage Sampling device
420 other ends are connect with the cathode of the power supply；The negative relay of master of tertiary voltage Sampling device 430 and electric automobile high-voltage system
Device is connected in parallel；First filter circuit 440 is connect with first voltage Sampling device 410, the second filter circuit 450 and second voltage
Sampling device 420 connects, and third filter circuit 460 is connect with tertiary voltage Sampling device 430；First filter circuit 440, second
Filter circuit 450, third filter circuit 460 are connect with modulus sample circuit 470 respectively, and modulus sample circuit 470 passes through isolation
Telecommunication circuit 480 is connect with microcontroller 490；
The microcontroller 490 is used to acquire under electric car main positive relay in electric process, main negative relay and preliminary filling
Electrical relay simultaneously when receiving and executing open command A point to the voltage of G point, B point to the voltage of G point and C point to the electricity of G point
Pressure；Main negative relay is judged to the voltage of G point to the voltage and C point of G point according to voltage, B point of the A point in lower electric process to G point
Device whether adhesion, judge to lead positive relay or pre-charge-relay whether adhesion；
Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, the C
Point indicates the connecting pin of main negative relay and load, and the G point indicates the cathode of power supply, based on the outer end of the positive relay of master
The connecting pin of positive relay and load.
The relay status detection device of above-mentioned electric automobile high-voltage system, by by first voltage Sampling device with it is electronic
The power sources in parallel of vehicle high voltage system connects；The positive relay of master of second voltage Sampling device one end and electric automobile high-voltage system
Outer end connection, the second voltage Sampling device other end connect with the cathode of the power supply；Tertiary voltage Sampling device with it is electronic
The negative relay of the master of vehicle high voltage system is connected in parallel；First filter circuit is connect with first voltage Sampling device, the second filtering
Circuit is connect with second voltage Sampling device, and third filter circuit is connect with tertiary voltage Sampling device；First filter circuit,
Two filter circuits, third filter circuit are connect with modulus sample circuit respectively, modulus sample circuit by isolation telecommunication circuit with
Microcontroller connection.The point on the basis of power cathode passes through voltage sample device, filter circuit, modulus sample circuit and isolation
Telecommunication circuit, which is realized, detects relay status, and only needs an isolation telecommunication circuit, greatly reduces cost.
Voltage sample device can be voltage sample resistance, and the number of voltage sample resistance is set as needed.It is adopting
When sample voltage is less than voltage threshold, voltage sample device can only include a voltage sample resistance.When sampled voltage is greater than electricity
When pressing threshold value, voltage sample device may include multiple voltage sample resistance.Voltage threshold according to modulus sample circuit determine, than
Such as, it can be 5V.In one of the embodiments, as shown in figure 5, being the relay status of electric automobile high-voltage system of the present invention
The structural schematic diagram of detection device embodiment two does not show object to be detected in order to which attached drawing is clear, directly with A point, B point, C
Point and G point indicate each end of object to be detected.The first voltage Sampling device includes the first voltage sampling being connected in series
Resistance 511 and second voltage sampling resistor 512, first voltage sampling resistor 511 are connect with the anode of the power supply, second voltage
Sampling resistor 512 is connect with the cathode of the power supply；
The second voltage Sampling device includes the tertiary voltage sampling resistor 521 being connected in series and the 4th voltage sample electricity
Resistance 522, the tertiary voltage sampling resistor 521 are connect with the outer end of main positive relay, the 4th voltage sample resistance 522 and
The cathode of power supply connects；
The tertiary voltage Sampling device includes the 5th voltage sample resistance 531 being connected in series and the 6th voltage sample electricity
Resistance 532, the 5th voltage sample resistance are connect with the outer end for leading negative relay, the 6th voltage sample resistance and power supply
Cathode connection；
First filter circuit 540 is connect with the both ends of second voltage sampling resistor 512, the second filter circuit 550 and the 4th
The both ends of voltage sample resistance 522 connect, and third filter circuit 560 is connect with the both ends of the 6th voltage sample resistance 532；
Wherein, the outer end of the negative relay of the master is the connection of the master negative relay and load of electric automobile high-voltage system
End.
In the embodiment, each voltage sample device includes two voltage sample resistance, can use voltage sample electricity
Partial pressure is realized in resistance, and sampling resistor acquires small voltage and by filter circuit is transmitted to modulus sample circuit, so as to avoid due to
Voltage is excessive to be needed to improve modulus sample circuit performance and causes problem at high cost.Microprocessor can be sampled according to second voltage
The computing the resistor value of voltage and two sampling resistors 511 and 512 that resistance 512 samples goes out corresponding A point to the voltage of G point；Micro- place
Manage device can according to the 4th voltage sample resistance 522 sample voltage and two sampling resistors 521 and 522 computing the resistor value go out pair
Voltage of the B point answered to G point；Microprocessor can be according to the voltage that the 6th voltage sample resistance 532 samples and two sampling electricity
The computing the resistor value of resistance 531 and 532 goes out corresponding C point to the voltage of G point.To carry out the detection of voltage and lower voltage.
The microcontroller is also used in one of the embodiments:
To VA0、VB0、VC0Judged；
If VA0-VB0> k0*VA0And-k0*VA0< VC0< 0,Main positive relay, main negative relay, preliminary filling
Relay is normal simultaneously to be disconnected；
If VA0=VB0And VC0=0, then lead positive relay or pre-charge-relay adhesion and main negative relay adhesion；
If VC0=0 and VB0< VA0, then it leads positive relay and normally disconnects, main negative relay adhesion；
If VA0=VB0And VC0> 0, then lead positive relay or pre-charge-relay adhesion, and main negative relay normally disconnects；
Wherein, VA0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute open command
When voltage of the A point to G point, VB0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute disconnection
Voltage of the B point to G point, VC when instruction0Indicate that main positive relay, main negative relay and pre-charge-relay are received and executed simultaneously
Voltage of the C point to G point when open command.
The microcontroller is also used in one of the embodiments:
Main positive relay in power up, main negative relay and precharge relay are determined according to the voltage that sampling resistor samples
VA when device receives and executes open command1And VB1；Wherein, VA1And VB1Respectively indicate in power up main positive relay,
A point when main negative relay and pre-charge-relay receive and execute open command is to the voltage of G point and B point to the electricity of G point
Pressure；
Judge VA1Whether VB is equal to1If VA1=VB1, then positive relay adhesion or preliminary filling relay adhesion are led, in termination
Judgement in electric process；
If VA1≠VB1, judge VA1-VB1> k1*VA1Whether meet,If satisfied, then to precharge relay
Device sends close command, obtains VA in the first preset time2、VB2、VC2；Wherein, VA2、VB2And VC2It is illustrated respectively in first
The A point obtained in preset time is to the voltage of G point, B point to the voltage of G point, C point to the voltage of G point；
If VA2≠VB2, it is spaced the second preset time, obtains and judges that A point is to the voltage of G point after being spaced the second preset time
It is whether equal with voltage of the B point to G point, if so, main negative relay adhesion, terminates the judgement in power up, if it is not, then pre-
Charge relay is not attracted, terminates the judgement in power up；
If VA2=VB2, VC2> 0 then sends open command to pre-charge-relay, while closing to the positive relay transmission of master
Instruction is closed, obtains VA after being spaced third preset time3、VB3、VC3；Wherein, VA3、VB3、VC3Respectively indicate interval third it is default when
Between after the A point that obtains to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
If VA3≠VB3, VC3≤ 0, then it leads positive relay and is not attracted, terminate the judgement in power up；
If VA3=VB3, VC3> 0 then sends open command to the positive relay of master, obtains after being spaced the 4th preset time
VA4And VB4；Judge VA4Whether VB is equal to4；Wherein, VA4And VB4The A point obtained after the 4th preset time of interval is respectively indicated to G
The voltage of point, B point are to the voltage of G point；
If VA4=VB4, then positive relay adhesion or preliminary filling relay adhesion are led, the judgement in power up is terminated；
If VA4≠VB4, judge VA4-VB4> k4*VA4Whether meet,If meeting VA4-VB4> k4*VA4,
Close command then is sent to preliminary filling relay and main negative relay, obtains VA after being spaced the 5th preset time5、VB5And VC5；Its
In, VA5、VB5And VC5It respectively indicates and obtains A point after the 5th preset time of interval to the voltage of G point, B point to the voltage and C of G point
Voltage of the point to G point, k5Indicate that pre-charge pressure is charged to the percentage of total voltage；
Judge whether to meet VB5> k5*VA5And VC5=0, if it is not, main negative relay is not attracted, terminate in power up
Judgement；If so, open command is sent to pre-charge-relay after the 6th preset time to the positive relay transmission close command of master,
Completion powers on.
It in one of the embodiments, further include the telecommunication circuit set on low-pressure area, the telecommunication circuit and microcontroller
Connection.
By be arranged telecommunication circuit, can will test information be transmitted to other terminals carry out display or early warning.Telecommunication circuit
It can be CAN (Controller Area Network, controller LAN) circuit.
It in one of the embodiments, further include the early warning circuit set on low-pressure area, the early warning circuit and microcontroller
Connection.
Early warning is realized by setting early warning circuit.
Detection device further includes first switch device, second switch device and third switch in one of the embodiments,
Device；
First switch device and first voltage Sampling device are connected in series, and connect with power sources in parallel；Second switch device
One end is connect with second voltage Sampling device, the outer end of the other end of second switch device and the cathode of power supply or main positive relay
Connection；Third switching device and tertiary voltage Sampling device are connected in series, and are connected in parallel with the negative relay of master.
Whether the embodiment can control by switching device and is detected, and without that can disconnect when detecting, save money
Source.The number of switching device can be multiple, for example respectively set one at first voltage Sampling device both ends；It is adopted in second voltage
Sample device both ends respectively set one；One is respectively set at tertiary voltage Sampling device both ends.
The relay status detection device of electric automobile high-voltage system of the invention is to realize that electric car of the invention is high
One of device of the relay status detection method of pressure system, therefore, the relay shape of above-mentioned electric automobile high-voltage system
The technical solution of the relevant technologies feature composition in state detection method embodiment is suitable for the relay of electric automobile high-voltage system
In device condition checkout gear, details are not described herein.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of relay status detection method of electric automobile high-voltage system, which is characterized in that electric automobile high-voltage system
Power sources in parallel has the first voltage Sampling device for detecting voltage；The outer end of the positive relay of the master of electric automobile high-voltage system and
The second voltage Sampling device for detecting voltage is connected between power cathode；The negative relay of the master of electric automobile high-voltage system
It is parallel with the tertiary voltage Sampling device for detecting voltage；Positive relay and load based on the outer end of the positive relay of master
Connecting pin；
Described method includes following steps:
Main positive relay, main negative relay and pre-charge-relay are received and are executed disconnected simultaneously in electric process under acquisition electric car
When opening instruction A point to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
Main negative relay is judged to the voltage of G point to the voltage and C point of G point according to voltage, B point of the A point in lower electric process to G point
Device whether adhesion, judge to lead positive relay or pre-charge-relay whether adhesion, comprising:
To VA0、VB0、VC0Judged；
If VA0-VB0>k0*VA0And-k0*VA0<VC0< 0,When, main positive relay, main negative relay, preliminary filling relay
It is normal simultaneously to disconnect；
If VA0=VB0And VC0=0, then lead positive relay or pre-charge-relay adhesion and main negative relay adhesion；
If VC0=0 and VB0<VA0, then it leads positive relay and normally disconnects, main negative relay adhesion；
If VA0=VB0And VC0> 0, then positive relay or pre-charge-relay adhesion are led, main negative relay normally disconnects；
Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, the C point table
Show the connecting pin of main negative relay and load, the G point indicates the cathode of power supply, VA0Indicate main positive relay, main negative relay
Voltage of the A point to G point, VB when receiving simultaneously with pre-charge-relay and execute open command0Indicate main positive relay, it is main it is negative after
Voltage of the B point to G point, VC when electric appliance and pre-charge-relay receive simultaneously and execute open command0Indicate main positive relay, master
Voltage of the C point to G point when negative relay and pre-charge-relay receive simultaneously and execute open command.
2. the relay status detection method of electric automobile high-voltage system according to claim 1, which is characterized in that in electricity
Under electrical automobile it is electrically operated before, further includes:
At most two relays are received and are held in main positive relay, main negative relay and pre-charge-relay in acquisition power up
A point when row close command is to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
Main positive relay is judged to the voltage of G point to the voltage and C point of G point according to voltage, B point of the A point in power up to G point
Or pre-charge-relay whether adhesion, judge main negative relay whether adhesion.
3. the relay status detection method of electric automobile high-voltage system according to claim 2, which is characterized in that described
At most two relays are received and are executed and close in main positive relay, main negative relay and pre-charge-relay in acquisition power up
Close the voltage of A point when instruction to the voltage of G point, B point to the voltage of G point and C point to G point；According to A point in power up to G
The voltage of point, B point to the voltage of G point and C point to the voltage of G point judge to lead positive relay or pre-charge-relay whether adhesion,
Judge main negative relay whether adhesion step, comprising:
It obtains when main positive relay in power up, main negative relay and pre-charge-relay receive and execute open command
VA1And VB1；Judge VA1Whether VB is equal to1, if so, main positive relay adhesion or preliminary filling relay adhesion, terminate power up
In judgement；If it is not, judging VA1-VB1>k1*VA1Whether meet,
If satisfied, then sending close command to pre-charge-relay, VA is obtained in the first preset time2、VB2；
If VA2≠VB2, it is spaced the second preset time, obtains and judges that A point is to the voltage and B of G point after being spaced the second preset time
Whether point is equal to the voltage of G point, if so, main negative relay adhesion, terminates the judgement in power up, if it is not, then preliminary filling
Electrical relay is not attracted, terminates the judgement in power up；
Wherein, VA1And VB1Main positive relay in power up, main negative relay and pre-charge-relay is respectively indicated to receive simultaneously
A point when executing open command is to the voltage of G point and B point to the voltage of G point；VA2、VB2It is illustrated respectively in the first preset time
The A point of acquisition is to the voltage of G point, B point to the voltage of G point.
4. the relay status detection method of electric automobile high-voltage system according to claim 3, which is characterized in that also wrap
It includes:
VC is obtained in the first preset time2, wherein VC2Indicate the C point obtained in the first preset time to the voltage of G point；
If VA2=VB2, VC2> 0, then open command is sent to pre-charge-relay, while sending closure to the positive relay of master and referring to
It enables, obtains VA after being spaced third preset time3、VB3、VC3；
If VA3≠VB3, VC3≤ 0, then it leads positive relay and is not attracted, terminate the judgement in power up；
Wherein, VA3、VB3、VC3The A point that obtains after the third preset time of interval is respectively indicated to the voltage of G point, B point to G point
The voltage of voltage and C point to G point.
5. the relay status detection method of electric automobile high-voltage system according to claim 4, which is characterized in that also wrap
It includes:
If VA3=VB3, VC3> 0, then open command is sent to the positive relay of master, obtains VA after being spaced the 4th preset time4And VB4；
Judge VA4Whether VB is equal to4；
If VA4=VB4, then positive relay adhesion or preliminary filling relay adhesion are led, the judgement in power up is terminated；
Wherein, VA4And VB4The A point that obtains after the 4th preset time of interval is respectively indicated to the voltage of G point, B point to the electricity of G point
Pressure.
6. the relay status detection method of electric automobile high-voltage system according to claim 5, which is characterized in that also wrap
It includes:
If VA4≠VB4, judge VA4-VB4>k4*VA4Whether meet,
If meeting VA4-VB4>k4*VA4, then close command is sent to preliminary filling relay and main negative relay, when interval the 5th is default
Between after obtain VA5、VB5And VC5；
Judge whether to meet VB5>k5*VA5And VC5=0, if it is not, main negative relay is not attracted, terminate the judgement in power up；
If so, send close command to the positive relay of master, open command is sent to pre-charge-relay after the 6th preset time, in completion
Electricity；
Wherein, VA5、VB5And VC5It respectively indicates and obtains A point after the 5th preset time of interval to the voltage of G point, B point to the electricity of G point
Pressure and voltage of the C point to G point, k5Indicate that pre-charge pressure is charged to the percentage of total voltage.
7. a kind of relay status detection device of electric automobile high-voltage system, which is characterized in that including isolation telecommunication circuit, set
In the first voltage Sampling device of higher-pressure region, second voltage Sampling device, tertiary voltage Sampling device, the first filter circuit,
Two filter circuits, third filter circuit and modulus sample circuit and the microcontroller set on low-pressure area；
The first voltage Sampling device is connect with the power sources in parallel of electric automobile high-voltage system；The second voltage Sampling device
One end is connect with the outer end of the positive relay of the master of electric automobile high-voltage system, the second voltage Sampling device other end with it is described
The cathode of power supply connects；Tertiary voltage Sampling device and the negative relay of master of electric automobile high-voltage system are connected in parallel；First filter
Wave circuit is connect with first voltage Sampling device, and the second filter circuit is connect with second voltage Sampling device, third filter circuit
It is connect with tertiary voltage Sampling device；First filter circuit, the second filter circuit, third filter circuit sample electricity with modulus respectively
Road connection, modulus sample circuit are connect by the way that telecommunication circuit is isolated with microcontroller；
The microcontroller is used to acquire under electric car main positive relay in electric process, main negative relay and pre-charge-relay
Simultaneously when receiving and executing open command A point to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；Under
A point in electric process judges whether main negative relay glues to the voltage of G point to the voltage and C point of G point to voltage, the B point of G point
Even, judge to lead positive relay or pre-charge-relay whether adhesion；
Wherein, the A point indicates that the anode of power supply, the B point indicate the connecting pin of main positive relay and load, the C point table
Show the connecting pin of main negative relay and load, the G point indicates the cathode of power supply, based on the outer end of the positive relay of master just after
The connecting pin of electric appliance and load.
8. the relay status detection device of electric automobile high-voltage system according to claim 7, which is characterized in that described
Microcontroller is also used to:
To VA0、VB0、VC0Judged；
If VA0-VB0>k0*VA0And-k0*VA0<VC0< 0,Main positive relay, main negative relay, preliminary filling relay are same
Shi Zhengchang is disconnected；
If VA0=VB0And VC0=0, then lead positive relay or pre-charge-relay adhesion and main negative relay adhesion；
If VC0=0 and VB0<VA0, then it leads positive relay and normally disconnects, main negative relay adhesion；
If VA0=VB0And VC0> 0, then positive relay or pre-charge-relay adhesion are led, main negative relay normally disconnects；
Wherein, VA0Indicate A point when main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute open command
To the voltage of G point, VB0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute open command
When voltage of the B point to G point, VC0Indicate that main positive relay, main negative relay and pre-charge-relay receive simultaneously and execute disconnection
Voltage of the C point to G point when instruction.
9. the relay status detection device of electric automobile high-voltage system according to claim 7 or 8, which is characterized in that
The microcontroller is also used to:
Determine that main positive relay in power up, main negative relay and pre-charge-relay are equal according to the voltage that sampling resistor samples
VA when receiving and executing open command1And VB1；Wherein, VA1And VB1It is negative to respectively indicate main positive relay, master in power up
A point when relay and pre-charge-relay receive and execute open command is to the voltage of G point and B point to the voltage of G point；
Judge VA1Whether VB is equal to1If VA1=VB1, then positive relay adhesion or preliminary filling relay adhesion are led, power up is terminated
In judgement；
If VA1≠VB1, judge VA1-VB1>k1*VA1Whether meet,If satisfied, then being sent to pre-charge-relay
Close command obtains VA in the first preset time2、VB2、VC2；Wherein, VA2、VB2And VC2Be illustrated respectively in first it is default when
The A point of interior acquisition is to the voltage of G point, B point to the voltage of G point, C point to the voltage of G point；
If VA2≠VB2, it is spaced the second preset time, obtains and judges that A point is to the voltage and B of G point after being spaced the second preset time
Whether point is equal to the voltage of G point, if so, main negative relay adhesion, terminates the judgement in power up, if it is not, then preliminary filling
Electrical relay is not attracted, terminates the judgement in power up；
If VA2=VB2, VC2> 0, then open command is sent to pre-charge-relay, while sending closure to the positive relay of master and referring to
It enables, obtains VA after being spaced third preset time3、VB3、VC3；Wherein, VA3、VB3、VC3After respectively indicating interval third preset time
The A point of acquisition is to the voltage of G point, B point to the voltage of G point and C point to the voltage of G point；
If VA3≠VB3, VC3≤ 0, then it leads positive relay and is not attracted, terminate the judgement in power up；
If VA3=VB3, VC3> 0, then open command is sent to the positive relay of master, obtains VA after being spaced the 4th preset time4And VB4；
Judge VA4Whether VB is equal to4；Wherein, VA4And VB4The A point that obtains is respectively indicated after the 4th preset time of interval to the electricity of G point
Pressure, B point are to the voltage of G point；
If VA4=VB4, then positive relay adhesion or preliminary filling relay adhesion are led, the judgement in power up is terminated；
If VA4≠VB4, judge VA4-VB4>k4*VA4Whether meet,If meeting VA4-VB4>k4*VA4, then to pre-
It fills relay and main negative relay sends close command, obtain VA after being spaced the 5th preset time5、VB5And VC5；Wherein, VA5、
VB5And VC5Respectively indicate obtain after the 5th preset time of interval A point to the voltage of G point, B point to the voltage and C point of G point to G point
Voltage, k5Indicate that pre-charge pressure is charged to the percentage of total voltage；
Judge whether to meet VB5>k5*VA5And VC5=0, if it is not, main negative relay is not attracted, terminate the judgement in power up；
If so, send close command to the positive relay of master, open command is sent to pre-charge-relay after the 6th preset time, in completion
Electricity.
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| CN201510082454.2A CN105988082B (en) | 2015-02-13 | 2015-02-13 | The relay status detection method and device of electric automobile high-voltage system |
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| CN201510082454.2A CN105988082B (en) | 2015-02-13 | 2015-02-13 | The relay status detection method and device of electric automobile high-voltage system |
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