CN106842005A - A kind of relay fault judgment method of electric automobile high-voltage system - Google Patents

A kind of relay fault judgment method of electric automobile high-voltage system Download PDF

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Publication number
CN106842005A
CN106842005A CN201611227337.1A CN201611227337A CN106842005A CN 106842005 A CN106842005 A CN 106842005A CN 201611227337 A CN201611227337 A CN 201611227337A CN 106842005 A CN106842005 A CN 106842005A
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Prior art keywords
relay
voltage
actual condition
act
condition value
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CN201611227337.1A
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CN106842005B (en
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吴恒
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Huizhou Blueway New Energy Technology Co Ltd
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Huizhou Blueway New Energy Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275Fault detection or status indication

Abstract

The invention discloses a kind of relay fault judgment method of electric automobile high-voltage system, state value Set is set by presetting relay, further according to terminal voltage after relay and the pressure difference of the rear terminal voltage of the pressure difference or relay and relay of battery voltage, judge the actual condition value Act of relay, finally call relay status function.Compare the corresponding setting state value Set and correspondence actual condition value Act of output relay, judge that relay is in normal condition or malfunction according to comparison result.This technical scheme causes that the program of electric automobile high-voltage power-on and power-off is optimised, and all detection parts about relay status can directly invoke monitoring result and draw, accurate fast and convenient.The holding state of power-on and power-off flow is not carried out in electric automobile, it is also possible to which relay is monitored, safety is more secure.

Description

A kind of relay fault judgment method of electric automobile high-voltage system
Technical field
The present invention relates to relay field of fault detection, the relay event of more particularly to a kind of electric automobile high-voltage system Barrier determination methods.
Background technology
Electric automobile including including mixed power electric car because having a set of high pressure driving system, i.e. electrokinetic cell, height Press-fitting electronic box etc..High-pressure system it is upper it is electric with lower electric process in, particularly frequent power-on and power-off, misoperation, power-on and power-off sequential are wrong By mistake etc., high voltage and high current are likely to cause to strike sparks in switching state, burn the failures such as relay.Relay high-voltage contact because Sparking is adhered when together, and high-pressure system will be unable to disconnect.If can not in time find and deal with, it is likely that can threaten dynamic Power battery, the vehicle even safety of operating personnel.
Relay is divided into the relay of the relay and feedback-less that have feedback signal.Because the relay price of band feedback is asked Topic, uses the relay for being more feedback-less signal at present.And existing patented technology is nearly all only in the upper and lower electric current of high pressure , it is necessary to just consider detection correspondence relay status when using certain relay in journey.If other when there is relay to occur Failure, might not find in time, and this use to vehicle brings very big potential safety hazard.And where is detected respectively using where Way also result in the numerous and diverse and inefficiency of code.
A kind of ni-mh hybrid vehicle high pressure system according to disclosed in Chinese patent document CN201510228159.3 The detection method of repeat circuit state of uniting, when its technical scheme is by receiving upper forceful electric power order according to BMS in battery pack The absolute value of the voltage Vbus_m differences at voltage Vpack_1 and some sequential power side two ends, or according to certain two sequential The absolute value of the voltage difference at power side two ends, or the voltage Vpack_1 in the battery pack of forceful electric power order is received according to BMS The absolute value of the voltage Vbus_1 differences at power side two ends judges whether relay is in when receiving upper forceful electric power order with BMS Adhesion state.Because its technical scheme is when judging that certain relay has failure problems, troubleshooting state will be entered, Other relays cannot be judged, it is meant that a failure problems for relay can only be judged each time, make its skill Art scheme has certain limitation.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of relay of electric automobile high-voltage system Device fault judgment method.
The purpose of the present invention is achieved through the following technical solutions:
A kind of relay fault judgment method of electric automobile high-voltage system, comprises the following steps:
S01:Setting relay status function status=st (Set, Act), wherein, Set is setting state value, and Act is Actual condition value;
S02:Relay status are set, are sent to relay and instructed, instruction is given to setting state value as argument Set, wherein, it is 0 or 1 to instruct;
S03:Terminal voltage and battery anode voltage after collection relay;
S04:According to terminal voltage after relay and the pressure difference or the pressure of relay rear and front end of the total positive voltage of battery pack Difference, judges the actual condition value Act of the relay, wherein, actual condition value Act is 0 or 1;
S05:Relay Status function of states are called, the corresponding setting state value Set and correspondence of output relay are real Border state value Act, if setting state value Set is equal to actual condition value Act, the relay fault-free;Otherwise, relay event Barrier alarm.
Wherein in one embodiment, the step S04 is specially:
S041:If the pressure difference of terminal voltage is more than or equal to critical value V after the total positive voltage of battery pack and the positive relays of AC1 When, the positive relays of AC disconnect, and actual condition value Act is 0;Otherwise, the positive relay closures of AC, actual condition value Act is 1;
S042:If the pressure difference of terminal voltage is more than or equal to critical value V after battery anode voltage and total positive relay2 When, preliminary filling relay and total positive relay all disconnect, and correspondence actual condition value is all 0, performs step S043;Otherwise, step is performed Rapid S044;
S043:The negative relay of the positive relays of acquiescence DC, DC and total negative relay actual condition value Act are 0, perform step S05;
S044:At least one is closed for preliminary filling relay and always positive relay, and the actual condition value Act of preliminary filling relay is 0 and total positive relay actual condition value Act be 1, preliminary filling relay actual condition value Act be 1 and total positive relay reality Border state value Act is 0 or the actual condition value Act of preliminary filling relay is 1 and the actual condition value Act of total positive relay is 1;
S045:If after total positive relay after terminal voltage and the positive relays of DC the pressure difference of terminal voltage be less than or equal to it is critical Value V1When, then the positive relays of DC are closed, and its correspondence actual condition value Act is 1;The positive relays of otherwise DC disconnect, and its correspondence is actual State value Act is 0;
S055:If the negative relay voltages of DC are equal to battery electrode voltage, the negative relay closures of DC, its actual shape of correspondence State value Act is 1;The negative relays of otherwise DC disconnect, and actual condition value Act is 0;
S056:If always terminal voltage is less than or equal to critical value with the pressure difference of battery electrode voltage after negative relay V3, then always negative relay is closed, and its correspondence actual condition value Act is 1;Otherwise, always negative relay disconnects, and actual condition value is 0.
Wherein in one embodiment, the step S044 is specially:
S0441:If the pressure difference of terminal voltage is more than or equal to critical value after battery anode voltage and total positive relay V1When, then preliminary filling relay is closed, and actual condition value Act is 1, and total positive relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay When the pressure difference of terminal voltage is negative after terminal voltage and preliminary filling relay afterwards, then preliminary filling relay closure, actual condition value Act is 1, total positive relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay Terminal voltage is that terminal voltage is small after terminal voltage and preliminary filling relay after positive number and total positive relay after terminal voltage and preliminary filling relay afterwards In or equal to critical value V3When, then preliminary filling relay is closed, and actual condition value Act is 1, total positive relay closure, actual shape State value Act is 1;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay Terminal voltage is that terminal voltage is big after terminal voltage and preliminary filling relay after positive number and total positive relay after terminal voltage and preliminary filling relay afterwards In equal to critical value V3When, then preliminary filling relay disconnects, and actual condition value Act is 0, total positive relay closure, actual condition value Act is 1.
Wherein in one embodiment, also include before the step S041:
S0411:Terminal voltage after collection fuse, if terminal voltage is less than or equal to after battery anode voltage and fuse Critical value V1, then fuse disconnection;Otherwise, fuse is normal.
Wherein in one embodiment, the critical value V1It is 3 the percent of battery voltage.
Wherein in one embodiment, the critical value V2It is the 10 of battery voltage.
Wherein in one embodiment, the critical value V3Equal to electric current I* preliminary filling resistance R.
Wherein in one embodiment, needed through preset time T before return to step S01 after the step S05.
Wherein in one embodiment, the time T is between [10ms, 20ms].
This technical scheme has following beneficial effect compared to prior art:
1. this technical scheme, realizes the real-time prison of the relay status to using more feedback-less signals at present Control, the relay for solving feedback-less signal can not in time detect failure, to the security presence of battery bag, vehicle and passengers inside the car The problem of significant threat.
2. this technical scheme also causes that the program of electric automobile high-voltage power-on and power-off is optimised, all relevant relay shapes The detection part of state can directly invoke monitoring result and draw, fast and convenient.So that the diagnosis of relay failure is straightforward, Which relay failure, has that what failure can be immediately arrived at from relay status function, quick and precisely safety.Electronic Automobile is not carried out the holding state of power-on and power-off flow, it is also possible to which relay is monitored, and safety is more secure.
Brief description of the drawings
Fig. 1 is the relay fault judgment method flow chart of the electric automobile high-voltage system in the present embodiment;
Fig. 2 is electric automobile relay circuit schematic diagram in the present embodiment.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing Give better embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to herein Described implementation method.On the contrary, the purpose for providing these implementation methods is to make to understand more the disclosure Plus it is thorough comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ", For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more The arbitrary and all of combination of related Listed Items.
It is as shown in Figure 1 the relay fault judgment method frame diagram of electric automobile high-voltage system, reference is please combined in the lump Fig. 2, comprises the following steps:
S01:Setting relay status function status=st (Set, Act), wherein, Set is setting state value, and Act is Actual condition value;
S02:Relay status are set, are sent to relay and instructed, instruction is given to setting state value as argument Set, wherein, it is 0 or 1 to instruct;
S03:Terminal voltage and battery anode voltage after collection relay;
S04:According to terminal voltage after relay and the pressure difference or the pressure of relay rear and front end of the total positive voltage of battery pack Difference, judges the actual condition value Act of the relay, wherein, actual condition value Act is 0 or 1;
S05:Relay Status function of states are called, the corresponding setting state value Set and correspondence of output relay are real Border state value Act, if setting state value Set is equal to actual condition value Act, the relay fault-free;Otherwise, relay event Barrier alarm.
Further, the step S04 is specially:
S041:If the pressure difference of terminal voltage is more than or equal to critical value V after the total positive voltage of battery pack and the positive relays of AC1 When, the positive relays of AC disconnect, and actual condition value Act is 0;Otherwise, the positive relay closures of AC, actual condition value Act is 1;
S042:If the pressure difference of terminal voltage is more than or equal to critical value V after battery anode voltage and total positive relay2 When, preliminary filling relay and total positive relay all disconnect, and correspondence actual condition value is all 0, performs step S043;Otherwise, step is performed Rapid S044;
S043:The negative relay of the positive relays of acquiescence DC, DC and total negative relay actual condition value Act are 0, perform step S05;
S044:At least one is closed for preliminary filling relay and always positive relay, and the actual condition value Act of preliminary filling relay is 0 and total positive relay actual condition value Act be 1, preliminary filling relay actual condition value Act be 1 and total positive relay reality Border state value Act is 0 or the actual condition value Act of preliminary filling relay is 1 and the actual condition value Act of total positive relay is 1;
S045:If after total positive relay after terminal voltage and the positive relays of DC the pressure difference of terminal voltage be less than or equal to it is critical Value V1When, then the positive relays of DC are closed, and its correspondence actual condition value Act is 1;The positive relays of otherwise DC disconnect, and its correspondence is actual State value Act is 0;
S055:If the negative relay voltages of DC are equal to battery electrode voltage, the negative relay closures of DC, its actual shape of correspondence State value Act is 1;The negative relays of otherwise DC disconnect, and actual condition value Act is 0;
S056:If always terminal voltage is less than or equal to critical value with the pressure difference of battery electrode voltage after negative relay V3, then always negative relay is closed, and its correspondence actual condition value Act is 1;Otherwise, always negative relay disconnects, and actual condition value is 0.
Further, the step S044 is specially:
S0441:If the pressure difference of terminal voltage is more than or equal to critical value after battery anode voltage and total positive relay V1When, then preliminary filling relay is closed, and actual condition value Act is 1, and total positive relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay When the pressure difference of terminal voltage is negative after terminal voltage and preliminary filling relay afterwards, then preliminary filling relay closure, actual condition value Act is 1, total positive relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay Terminal voltage is that terminal voltage is small after terminal voltage and preliminary filling relay after positive number and total positive relay after terminal voltage and preliminary filling relay afterwards In or equal to critical value V3When, then preliminary filling relay is closed, and actual condition value Act is 1, total positive relay closure, actual shape State value Act is 1;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay Terminal voltage is that terminal voltage is big after terminal voltage and preliminary filling relay after positive number and total positive relay after terminal voltage and preliminary filling relay afterwards In equal to critical value V3When, then preliminary filling relay disconnects, and actual condition value Act is 0, total positive relay closure, actual condition value Act is 1.
Further, also include before the step S041:
S0411:Terminal voltage after collection fuse, if terminal voltage is less than or equal to after battery anode voltage and fuse Critical value V1, then fuse disconnection;Otherwise, fuse is normal.
In the present embodiment, the critical value V1It is 3 the percent of battery voltage.
In the present embodiment, the critical value V2It is the 10 of battery voltage.
In the present embodiment, the critical value V3Equal to electric current I* preliminary filling resistance R.
Further, needed through preset time T before return to step S01 after the step S05.
Further, the time T is between [10ms, 20ms].
It should be noted that as shown in Fig. 2 battery bag cathode voltage is the voltage at A1 ends in Fig. 2, the rear end of fuse Voltage is the voltage at A2 ends in Fig. 2, and the rear terminal voltage of the positive relays of AC is the voltage at A3 ends in Fig. 2, preliminary filling relay Terminal voltage is the voltage at A4 ends in Fig. 2 afterwards, and the rear terminal voltage of total positive relay is the voltage at A5 ends in Fig. 2, the positive relays of DC The rear terminal voltage of device is the voltage at A6 ends in Fig. 2, and the rear terminal voltage of the negative relays of DC is the voltage at A7 ends in Fig. 2, total negative The rear terminal voltage of relay is the voltage at A8 ends in Fig. 2.
Also, it should be noted that in program initialization, the setting state value Set of all relay status is both configured to 0, Off-state, further according to reality the need for, instruction is sent to relay and is changed setting state value Set.
Also, it should be noted that the electric current I is to flow through the Weak current of preliminary filling resistance R in Fig. 2.
The invention discloses a kind of relay fault judgment method of electric automobile high-voltage system, by presetting relay Device sets state value Set, further according to pressure difference or relay and the relay of terminal voltage after relay and battery voltage The pressure difference of terminal voltage, judges the actual condition value Act of relay afterwards, finally calls relay status function.Compare output after Whether the corresponding setting state value Set and correspondence actual condition value Act of electrical equipment, judge relay in just according to comparison result Normal state or malfunction.This technical scheme causes that the program of electric automobile high-voltage power-on and power-off is optimised, all relevant The detection part of relay status can directly invoke monitoring result and draw, fast and convenient, quick and precisely safety.In electronic vapour Car is not carried out the holding state of power-on and power-off flow, it is also possible to which relay is monitored, and safety is more secure.
The above implementation method only expresses several embodiments of the invention, and its description is more specific and detailed, but Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for the ordinary skill people of this area For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to of the invention Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (9)

1. a kind of relay fault judgment method of electric automobile high-voltage system, it is characterised in that comprise the following steps:
S01:Setting relay status function status=st (Set, Act), wherein, Set is setting state value, and Act is actual State value;
S02:Relay status are set, are sent to relay and instructed, setting state value Set is given to using instruction as argument, its In, it is 0 or 1 to instruct;
S03:Terminal voltage and battery anode voltage after collection relay;
S04:According to terminal voltage after relay and the pressure difference or the pressure difference of relay rear and front end of the total positive voltage of battery pack, Judge the actual condition value Act of the relay, wherein, actual condition value Act is 0 or 1;
S05:Call relay Status function of states, the corresponding setting state value Set and the actual shape of correspondence of output relay State value Act, if setting state value Set is equal to actual condition value Act, the relay fault-free;Otherwise, the relay failure report It is alert.
2. the relay fault judgment method of a kind of electric automobile high-voltage system according to claim 1, it is characterised in that The step S04 is specially:
S041:If the pressure difference of terminal voltage is more than or equal to critical value V after the total positive voltage of battery pack and the positive relays of AC1When, AC Positive relay disconnects, and actual condition value Act is 0;Otherwise, the positive relay closures of AC, actual condition value Act is 1;
S042:If the pressure difference of terminal voltage is more than or equal to critical value V after battery anode voltage and total positive relay2When, in advance Fill relay and total positive relay all disconnects, correspondence actual condition value is all 0, performs step S043;Otherwise, step is performed S044;
S043:The negative relay of the positive relays of acquiescence DC, DC and total negative relay actual condition value Act are 0, perform step S05;
S044:Preliminary filling relay and total positive relay at least one closure, the actual condition value Act of preliminary filling relay for 0 and Always the actual condition value Act of positive relay is the actual shape that the actual condition value Act of 1, preliminary filling relay is 1 and total positive relay State value Act is 0 or the actual condition value Act of preliminary filling relay is 1 and the actual condition value Act of total positive relay is 1;
S045:If the pressure difference of terminal voltage is less than or equal to critical value V after terminal voltage and the positive relays of DC after total positive relay1 When, then the positive relays of DC are closed, and its correspondence actual condition value Act is 1;The positive relays of otherwise DC disconnect, its correspondence virtual condition Value Act is 0;
S055:If the negative relay voltages of DC are equal to battery electrode voltage, the negative relay closures of DC, its correspondence actual condition value Act is 1;The negative relays of otherwise DC disconnect, and actual condition value Act is 0;
S056:If always terminal voltage is less than or equal to critical value V with the pressure difference of battery electrode voltage after negative relay3, then always Negative relay closure, its correspondence actual condition value Act is 1;Otherwise, always negative relay disconnects, and actual condition value is 0.
3. the relay fault judgment method of electric automobile high-voltage system according to claim 2, it is characterised in that described Step S044 is specially:
S0441:If the pressure difference of terminal voltage is more than or equal to critical value V after battery anode voltage and total positive relay1When, Then preliminary filling relay is closed, and actual condition value Act is 1, and total positive relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay rear end electricity When the pressure difference of terminal voltage is negative after pressure and preliminary filling relay, then preliminary filling relay is closed, and actual condition value Act is 1, always just Relay disconnects, and actual condition value is 0;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay rear end electricity After pressure and preliminary filling relay terminal voltage be after positive number and total positive relay after terminal voltage and preliminary filling relay terminal voltage be less than or Equal to critical value V3When, then preliminary filling relay is closed, and actual condition value Act is 1, total positive relay closure, actual condition value Act It is 1;
If the pressure difference of terminal voltage is less than critical value V after battery anode voltage and total positive relay1And total positive relay rear end electricity Terminal voltage is that terminal voltage is more than or equal to after terminal voltage and preliminary filling relay after positive number and total just relay after pressure and preliminary filling relay Critical value V3When, then preliminary filling relay disconnects, and actual condition value Act is 0, total positive relay closure, and actual condition value Act is 1.
4. the relay fault judgment method of electric automobile high-voltage system according to claim 2, it is characterised in that described Also include before step S041:
S0411:Terminal voltage after collection fuse, if after battery anode voltage and fuse terminal voltage be less than or equal to it is critical Value V1, then fuse disconnection;Otherwise, fuse is normal.
5. the relay fault judgment method of the electric automobile high-voltage system according to claim 3 or 4, it is characterised in that The critical value V1It is 3 the percent of battery voltage.
6. the relay fault judgment method of electric automobile high-voltage system according to claim 2, it is characterised in that described Critical value V2It is the 10 of battery voltage.
7. the relay fault judgment method of electric automobile high-voltage system according to claim 3, it is characterised in that described Critical value V3Equal to electric current I* preliminary filling resistance R.
8. the relay fault judgment method of electric automobile high-voltage system according to claim 1, it is characterised in that described Needed through preset time T before return to step S01 after step S05.
9. the relay fault judgment method of electric automobile high-voltage system according to claim 8, it is characterised in that described Time T is between [10ms, 20ms].
CN201611227337.1A 2016-12-27 2016-12-27 Relay fault judgment method for high-voltage system of electric automobile Active CN106842005B (en)

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