CN109188169A - Condition detection method, device and the automobile of high-voltage interlocking loop - Google Patents
Condition detection method, device and the automobile of high-voltage interlocking loop Download PDFInfo
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Abstract
A kind of condition detection method of high-voltage interlocking loop, high-voltage interlocking loop couple to form detection loop with a division module, comprising: in the positive voltage square wave current signal of detection loop load first frequency；In the negative voltage square wave current signal of detection loop load second frequency；It detects the first signal component of the first frequency in the division module and exports the second signal component of the first detection level and the second detection level and second frequency and export third detection level and the 4th detection level；Determine whether high-voltage interlocking loop is abnormal according to the first detection level, the second detection level, third detection level and the 4th detection level.HVIL loop is driven using square wave current signal, since loop is single closed loop, there is no duplexure, current signal will not change with length of transmission line, there is no signal decaying, therefore there is farther transmission range, nearly all vehicle can be met to the general-purpose platform demand of high-voltage interlocking loop-length.
Description
Technical field
The invention belongs to technical field of new energy more particularly to a kind of condition detection method of high-voltage interlocking loop,
Device and automobile.
Background technique
Currently, with new-energy automobile at home fast development and it is universal, the safety of new-energy automobile increasingly by
To the concern of people.Since the voltage of new-energy automobile high-pressure system is generally in 300V~600V, and the voltage range is much super
The safe voltage range for having gone out human body, based on the considerations of protection driver, passenger and maintenance personal's personal safety, high-voltage interlocking
(High Voltage Interlock Loop, HVIL) technology is widely used in new-energy automobile high-voltage safety field.High pressure
Interlock is by using low pressure electric signal, by each component of high-pressure system (including electrokinetic cell system, high voltage electric equipment, height
Pressure connector, high-tension cable etc.) be together in series to form closed-loop, the entire high-pressure system circuit of real-time monitoring vehicle it is complete
Property.When high-voltage interlocking loop disconnects extremely, battery management system triggers Security Techniques, disconnects electrokinetic cell system, from
And protect vehicle crew from electric shock.
Current high-voltage interlocking device generally uses two kinds of technologies to realize: analog voltage signal monitoring and digital voltage letter
Number monitoring.Wherein, analog voltage signal monitoring technology judges the on off operating mode of loop by reading the size of loop voltage, but
Be that this technology has following deficiency: when loop cable is longer, line resistance is excessive, voltage signal has larger pressure on loop cable
Drop, it is easy to appear numerical bias for the voltage signal of acquisition, to the failures such as generate wrong report, fail to report.Digital voltage signal monitoring
Technology generally passes through the frequency and duty of identification PWM (Pulse Width Modulation, pulse width modulation) voltage signal
Than come the on off operating mode that judges loop, still, this monitoring scheme is multiple in vehicle due to being transmitted using single-ended PWM voltage signal
Under miscellaneous electromagnetic environment, anti-interference ability is poor, is highly susceptible to common mode interference and leads to distorted signals, to give monitoring knot
The reliability of fruit, which is brought, to be seriously affected.
Summary of the invention
In view of this, the embodiment of the invention provides condition detection method, device and the automobile of a kind of high-voltage interlocking loop,
It aims to solve the problem that in traditional technical solution and loop interlocking detection, when vehicle interlocked rings pass by long, ring is carried out using voltage signal
Route resistance increases, and so as to cause loop, there are biggish additional voltage drops, brings numerical bias to interlocking detection, it is reliable to influence detection
Property, while the poor problem of anti-interference ability of voltage signal.
The first aspect of the embodiment of the present invention provides a kind of condition detection method of high-voltage interlocking loop, and the high pressure is mutual
Lock ring Lu Yuyi division module couples to form detection loop, and the condition detection method includes:
In the positive voltage square wave current signal of detection loop load first frequency；
It detects the first signal component of the first frequency in the division module and exports the first detection level and the
Two detection level；
In the negative voltage square wave current signal of detection loop load second frequency；
It detects the second signal component of the second frequency in the division module and exports third detection level and the
Four detection level；
According to the first detection level, the second detection level, third detection level and the 4th detection
Level determines whether the high-voltage interlocking loop is abnormal.
The second aspect of the embodiment of the present invention provides a kind of condition checkout gear of high-voltage interlocking loop, and the high pressure is mutual
Lock ring Lu Yuyi division module couples to form detection loop, and the condition checkout gear includes:
First signal generator is configured as loading the positive voltage square wave current letter of first frequency in the detection loop
Number；
Detection unit is configured as detecting the first signal component of the first frequency in the division module and exports
First detection level and the second detection level；
Second signal generator is configured as loading the negative voltage square wave current letter of second frequency in the detection loop
Number；
The detection unit is additionally configured to detect the second signal component of the second frequency in the division module
And export third detection level and the 4th detection level；
Control unit is configured as according to the first detection level, the second detection level, third detection electricity
The gentle 4th detection level determines whether the high-voltage interlocking loop is abnormal.
The third aspect of the embodiment of the present invention provides a kind of automobile, the state inspection including such as above-mentioned high-voltage interlocking loop
Survey device.
The condition detection method and device of above-mentioned high-voltage interlocking loop drive HVIL loop using square wave current signal, by
It is single closed loop in loop, without duplexure, current signal will not change with length of transmission line, and signal is not present
Decaying, therefore there is farther transmission range, nearly all vehicle can be met to the general-purpose platform need of high-voltage interlocking loop-length
It asks.In addition, driving HVIL loop using square wave current signal, relative to voltage signal, square wave current signal has higher anti-
Interference performance and better stability, so that system has the anti-interference rejection ability of higher EMC and better reliability.
Meanwhile high-voltage interlocking loop is driven using bipolar square wave current signal, because it is with broader reversal peak peak amplitude, phase
Compared with unipolarity square wave current signal, when carrying out the judgement of loop on off operating mode, the present invention has higher fault-tolerant ability and Shandong
Stick.In addition, can effectively identify different failure classes by implementing dependent failure detection method to two groups of four level signals
Type, including loop open circuit fault, loop are shorted to power failure, loop is shorted to earth fault etc., so as to quickly check event
Barrier saves maintenance time and cost.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram of the shape detection device for the high-voltage interlocking loop that one embodiment of the invention provides；
Fig. 2 is the implementation process schematic diagram of the shape detection method of high-voltage interlocking loop provided in an embodiment of the present invention；
Fig. 3 is the implementation process schematic diagram of the shape detection method step S120 of the high-voltage interlocking loop in Fig. 2；
Fig. 4 is the implementation process schematic diagram of the shape detection method step S140 of the high-voltage interlocking loop in Fig. 2；
Fig. 5 be another embodiment of the present invention provides high-voltage interlocking loop shape detection device structural schematic diagram；
Fig. 6 is the exemplary circuit schematic diagram of the first embodiment of high-voltage interlocking detection circuit shown in fig. 5；
Fig. 7 is the exemplary circuit schematic diagram of the second embodiment of high-voltage interlocking detection circuit shown in fig. 5；
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.
Referring to Fig. 1, the high-voltage interlocking loop 10 in the embodiment of the present invention couples formation detection ring with a division module 110
Road 20, high-voltage interlocking loop 10 can be serially connected in following high voltage electric apparatus assembly: electrokinetic cell system high-voltage connector and its
Manual maintenance switch, power distribution unit high-voltage connector and its upper cover plate, driving motor high-voltage connector, Vehicular charger are high
Crimp plug-in unit, high-pressure air conditioner compressor and high pressure DC-DC module etc..High-voltage interlocking loop 10 is connected formation with division module 110
One of Components Parallel Connection in measure loop 20 or division module 110 and high-voltage interlocking loop 10 forms measure loop 20,
Division module 110 is the circuit being made of at least one of resistance, inductance and capacitor.
Fig. 1 and Fig. 2 are please referred to, the condition detection method of high-voltage interlocking loop provided in an embodiment of the present invention includes following step
It is rapid:
Step S110 loads the positive voltage square wave current signal of first frequency in detection loop 20.
Specifically, positive voltage square wave current signal is generated using the first signal generator 120 (such as current source), and passed through
The control of first switch 160 is linked into detection loop 20.In this way, HVIL loop is driven using square wave current signal, due to loop
For single closed loop, without duplexure, current signal will not change with length of transmission line, and there is no signals to decay,
Therefore there is farther transmission range, nearly all vehicle can be met to the general-purpose platform demand of high-voltage interlocking loop-length
Step S120 detects the first signal component of the first frequency in division module 110 and exports the first detection level
With the second detection level.
Specifically, detection module 140 detects component of voltage of the positive voltage square wave current signal in division module 110, and
Two are respectively obtained after being compared respectively with two predeterminated voltages after being pre-processed to the component of voltage and (such as amplify, bias)
A comparison result (detection level) that can indicate 10 state of high-voltage interlocking loop.
Step S130 loads the negative voltage square wave current signal of second frequency in detection loop 20.
Specifically, negative voltage square wave current signal is generated using second signal generator 130, and passes through second switch 170
Control is linked into detection loop 20.In addition, HVIL loop is driven using square wave current signal, relative to voltage signal, square wave
Current signal also has higher anti-interference ability and better stability, so that system has higher EMC anti-interference
Rejection ability and better reliability.Meanwhile high-voltage interlocking loop 10 is driven using bipolar square wave current signal, because it has
Broader reversal peak peak amplitude, compared to unipolarity square wave current signal, when carrying out the judgement of loop on off operating mode, so that
This programme has higher fault-tolerant ability and robustness.
Step S140 detects the second signal component of the second frequency in division module 110 and exports third detection level
With the 4th detection level.Process and step S120 are similar, and detection module 140 detects generating positive and negative voltage square wave current signal in partial pressure mould
Component of voltage on block 110, and after being pre-processed to the component of voltage and (such as amplifying, bias) respectively with two predeterminated voltages
Two level signals that can indicate 10 state of high-voltage interlocking loop are respectively obtained after being compared.
Step S150 is determined according to the first detection level, the second detection level, third detection level and the 4th detection level
Whether high-voltage interlocking loop is abnormal.By judging two groups of four level signals, different failure classes can be effectively identified
Type, including loop open circuit fault, loop are shorted to power failure, loop is shorted to earth fault etc., so as to quickly check event
Barrier saves maintenance time and cost.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.For example step S130 can be first carried out, step S140, then execute step S110, S120.In addition, positive voltage square wave current is believed
Number and negative voltage square wave current signal be output electric current be 10~30mA, frequency is 20~1000Hz, duty ratio be 20%~
80% PWM current signal.Optionally, the size of current of positive voltage square wave current signal and negative voltage square wave current signal, frequency
Rate is identical with duty ratio.
In more detailed embodiment, figure Fig. 1 and Fig. 3 are please referred to, step S120 includes:
Step S121, detection positive voltage square wave current signal load the first voltage component in division module 110 and increase
Benefit.In one embodiment, detection module 140 includes difference amplifier 142,142 both ends of difference amplifier and division module 110
Both ends connection, the first voltage component detected in division module 110 are exported to after its gain amplification in output end.
First voltage component after gain is exported the first detection level by step S122 compared with the first predeterminated voltage.?
In one embodiment, detection module 140 using first voltage comparator 143 by first voltage component compared with the first predeterminated voltage
Export first comparison result.
First voltage component after gain is exported the second detection level by step S123 compared with the second predeterminated voltage.?
In one embodiment, detection module 140 using second voltage comparator 144 by first voltage component compared with the second predeterminated voltage
Export second comparison result.
In more detailed embodiment, Fig. 1 and Fig. 4 are please referred to, similar with step S120, step S140 includes:
Step S141, detection negative voltage square wave current signal load the second voltage component in the division module and increase
Benefit；142 both ends of difference amplifier are connect with 110 both ends of division module, detect the second voltage component in division module 110 to it
It is exported after gain amplification in output end.
Second voltage component after gain is exported third detection level by step S142 compared with the first predeterminated voltage；Benefit
Second voltage component is exported into third comparison result compared with the first predeterminated voltage with first voltage comparator 143.
Second voltage component after gain is exported the 4th detection level by step S143 compared with the second predeterminated voltage.Benefit
Second voltage component is exported to the 4th comparison result compared with the second predeterminated voltage with second voltage comparator 144.
In one embodiment, the principle of the second predeterminated voltage setting is when detection loop 20 accesses positive voltage square wave current
When signal, voltage > second predeterminated voltage > 0 of the first voltage component after 142 gain of difference amplifier；First predeterminated voltage is set
Fixed principle is when detection loop 20 accesses negative voltage square wave current signal, and second voltage component increases through difference amplifier 142
Voltage<first predeterminated voltage<0 after benefit, i other words the second predeterminated voltage>0>first predeterminated voltage.
And in another embodiment, a fixed positive common mode is biased to the generating positive and negative voltage at 110 both ends of division module
Voltage makes the voltage perseverance positive value of the amplification output of difference amplifier 142, then in this embodiment, the second predeterminated voltage > the first
Predeterminated voltage > 0.
In more detailed embodiment, step S150 includes: to detect level, the second detection level, third detection for first
Level and the 4th detection level carry out analog-to-digital conversion and obtain corresponding digital value；Normal controller (control unit 150) can within
It sets or external module converter can will test level conversion as corresponding digital signal.It hereafter, will be respectively in detection loop 20
The digital signal that one group of four detection level conversion that the upper primary positive and negative voltage square wave current signal of load obtains obtain is as high
The state judgment basis of pressure interlocking loop 10.So the digital value is matched in preset table, to determine that high pressure is mutual
The state on lock ring road." digital signal-malfunction " table that obtained digital signal and memory are pre-stored by controller into
Row matching, to determine the current state of high-voltage interlocking loop 10.
In addition, can be applicable to electricity the embodiment of the invention also discloses a kind of condition checkout gear of high-voltage interlocking loop
On electrical automobile, mixed electrical automobile or battery-operated motor cycle, referring to Fig. 5, the condition checkout gear of high-voltage interlocking loop includes and high pressure
Interlocking loop 10 couples division module 210, the first signal generator 220, second signal generator for forming detection loop 20
230, detection unit 240 and control unit 250.
First signal generator 220 is connect with 20 first end of detection loop, is configured as through first switch 260 to detection
The positive voltage square wave current signal of the load first frequency of loop 20；Second signal generator 230 and 20 second end of detection loop connect
It connects, is configured as loading the negative voltage square wave current signal of second frequency to detection loop 20 by second switch 270；Detection is single
Member 240 is in parallel with division module 210, is configured as in the case where only first switch 260 accesses in detection division module 210
First signal component of first frequency simultaneously exports the first detection level and the second detection level, and connects in only second switch 270
The second signal component of the second frequency in division module 210 is detected in the case where entering and exports third detection level and the 4th inspection
Survey level；Control unit 250 is connect with detection unit 240, first switch 260 and second switch 270, is configured to control
First switch 260 and second switch 270 are opened and closed, and according to the first detection level, the second detection level, third detection level and the
Four detection level determine whether high-voltage interlocking loop 10 is abnormal.
Specifically, first end (the i.e. division module 210 of the output end of the first signal generator 220 and measure loop 20
One end) it connects, the control terminal of first switch 260 is connect with the first control terminal of control unit 250, the input of first switch 260
End is connect with the second end of measure loop 20,260 output end of first switch ground connection, when first switch 260 is closed, the first signal
The positive voltage square wave current signal that generator 220 generates will be loaded on measure loop 20.Second signal generator 230 it is defeated
Outlet is connect, second switch with the second end (i.e. the one end of high-voltage interlocking loop 10 far from division module 210) of measure loop 20
270 control terminal is connect with the second control terminal of control unit 250, and the of the input terminal of second switch 270 and measure loop 20
One end connection, the output end ground connection of second switch 270, when second switch 270 is closed, what second signal generator 230 generated
Negative voltage square wave current signal will be loaded on measure loop 20.Detection unit 240 is first electric to positive/negative voltage square wave is detected
Signal loading is flowed in division module 210 after component of voltage progress differential amplification, respectively the reference voltage signal different from two
It is compared to export different comparison result (detection level) and be input to two input terminals of control unit 250, when high pressure is mutual
When lock ring road 10 normally connects, control unit 250, which can detect that, meets expected detection level combinations；When high-voltage interlocking loop 10
There is abnormal connection, such as breaking, be shorted to power supply, be shorted to power ground, control unit 250 detects abnormal detection level
Combination.
In wherein some embodiments, the first signal generator 220 and second signal generator 230 are output size of current
For the current source for the PWM current signal that 10~30mA, frequency are 20~1000Hz, duty ratio is 20%~80%.It is understood that
Be that the size of current, frequency size and duty ratio of the first signal generator 220 and second signal generator 230 can distinguish phase
It is not identical with that can also distinguish.
In the present embodiment, referring to Fig. 6, current source include the first triode T1, the second triode T2, first resistor R1 and
Second resistance R2, in which: the base stage of the first triode T1 and the emitter of the second triode T2 and the first end of first resistor R1
It connecing altogether, the collector of the first triode T1 and the base stage of the first end of second resistance R2 and the second triode T2 connect altogether, and the one or three
The emitter of pole pipe T1 and the second end of first resistor R1 are connect with power supply Vbat, and the second end and power ground of second resistance R2 connects
It connects, the collector of the second triode T2 is connect as the output end of current source with detection loop 20.In one of the embodiments,
Referring to Fig. 6, the first triode T1 and the second triode T2 are PNP type triode.In another embodiment, figure is please referred to
7, the first triode T1 and the second triode T2 are NPN type triode.Further, the first signal generator is respectively constituted
220 and second signal generator 230 two current sources in two the first triode T1 and two the second triode T2 electricity
Performance parameter is identical, can choose the device of same model for the sake of convenient, respectively constitutes the first signal generator 220 and second signal
Two first resistor R1 resistance values in two current sources of generator 230 are identical, and the resistance value of two second resistance R2 is also identical.
Referring to Fig. 6, first switch 260 and second switch 270 include 3rd resistor in one of the embodiments,
The first end of R3, the first metal-oxide-semiconductor M1,3rd resistor R3 are connect as the control terminal of switch with the control terminal of control unit 250, the
The second end of three resistance R3 is connect with the grid of the first metal-oxide-semiconductor M1, output end and electricity of the source electrode of the first metal-oxide-semiconductor M1 as switch
It connects to source, the drain electrode of the first metal-oxide-semiconductor M1 is connect as the output end of switch with detection loop 20.Optionally, first is constituted to open
Pass 260 is identical with two the first metal-oxide-semiconductor M1 electric parameters on second switch 270, is the metal-oxide-semiconductor of P-channel type, is
It can choose the device of same model for the sake of convenient, it is preferable that two the first metal-oxide-semiconductor M1 have short circuit shutdown, overload shutdown, thermal runaway
The hardware protections performances such as shutdown.
Referring to Fig. 7, in another embodiment, first switch 260 and second switch 270 include the 4th resistance R4,
5th resistance R5, the second metal-oxide-semiconductor M2 and third transistor T3, control terminal and control of the first end of the 4th resistance R4 as switch
The control terminal of unit 250 connects, and the second end of the 4th resistance R4 is connect with the base stage of third transistor T3, third transistor T3's
Emitter is connect as the output end of switch with power ground, the grid of the collector of third transistor T3 and the second metal-oxide-semiconductor M2 and
The first end of 5th resistance R5 connects altogether, and the drain electrode of the second metal-oxide-semiconductor M2 and the second end of the 5th resistance R5 are connected to power supply Vbat altogether, the
The source electrode of two metal-oxide-semiconductor M2 is connect as the input terminal of switch with detection loop 20.Optionally, first switch 260 and second is constituted
Two the second metal-oxide-semiconductor M2 electric parameters on switch 270 are identical, are the metal-oxide-semiconductor of P-channel type, for convenience may be used
To select the device with model, it is preferable that two the second metal-oxide-semiconductor M2 have the hardware such as short circuit shutdown, overload shutdown, thermal runaway shutdown
Protective value；It is NPN type triode in addition, two third transistor T3 electric parameters are identical, it for convenience can be with
Select the device with model.
Referring to Fig. 5, in some embodiments, detection unit packet difference amplifier 242,243 and of first voltage comparator
Second voltage comparator 244,
The first end of the first input end of difference amplifier 242 and the first signal generator 220 and division module 210 connects
It connects, the second end company of the second input terminal of difference amplifier 242 and the first end of high-voltage interlocking loop 10 and division module 210
It connects, the output end of difference amplifier 242 and the inverting input terminal of first voltage comparator 243 and second voltage comparator 244
Non-inverting input terminal connection, the non-inverting input terminal of first voltage comparator 243 and the inverting input terminal point of second voltage comparator 244
The first reference voltage REF1 and the second reference voltage REF2, the output end and control unit of first voltage comparator 243 are not accessed
250 first input end connection, the output end of second voltage comparator 244 are connect with the second input terminal of control unit 250.It can
Selection of land first voltage comparator 243 is identical as 244 electric parameters of second voltage comparator, can choose for convenience same
The device of model.
Differential amplification device 242 is configured as the of detection positive voltage square wave current signal load in division module 210
One component of voltage and gain are additionally configured to second electricity of the detection negative voltage square wave current signal load in division module 210
Press component and gain；First voltage comparator 242 is configured as the first voltage component and the first predeterminated voltage ratio after gain
Level is detected compared with output first, is additionally configured to the second voltage component after gain the output third compared with the first predeterminated voltage
Detect level；Second voltage comparator 243 is configured as the first voltage component after gain is defeated compared with the second predeterminated voltage
Second detection level out is additionally configured to exporting the second voltage component after gain into the 4th detection compared with the second predeterminated voltage
Level.
In one of the embodiments, referring to Fig. 6, difference amplifier 242 include the 6th resistance R6, the 7th resistance R7,
The of 8th resistance R8, the 9th resistance R9 and a voltage operational amplifier U1, the first end of the 8th resistance R8 and division module 210
One end connection, the first end of the 6th resistance R6 are connect with the second end of division module 210, the second end and the 9th of the 8th resistance R8
The first end of resistance R9 is connected with the non-inverting input terminal of voltage operational amplifier U1, the second end and the 7th resistance of the 6th resistance R6
The first end of R7 is connected with the inverting input terminal of voltage operational amplifier U1, second end and the voltage operational amplification of the 7th resistance R7
The output end of device U1 connects, and the second end of the 9th resistance R9 is connect with power ground, the output end conduct of voltage operational amplifier U1
The output end of difference amplifier 242.Optionally, 0 the first reference voltage of > REF1 of the second reference voltage REF2 > in the present embodiment.
In another embodiment, referring to Fig. 7, difference amplifier 242 further includes a biasing resistor R10, biased electrical
Hinder the one positive voltage reference REF3 of the first termination of R10, the non-inverting input terminal of the second termination voltage operational amplifier U1.In this way,
The generating positive and negative voltage at 210 both ends of division module biases a fixed positive common-mode voltage, the voltage perseverance positive value for exporting amplification.
Optionally, second reference voltage REF5 > the first reference voltage REF4 > 0 in the present embodiment.
Further, referring to Fig. 6, control unit 250 is according to the preset first detection level, the second detection electricity
The syntagmatic of flat, third detection level and the 4th detection level carries out fault detection and judgement to high-voltage interlocking loop 10.Its
In, in detection unit 210, the principle that the second reference voltage REF2 is set be when flow through the current direction of division module 210 as
Voltage > second reference voltage REF2 > 0 when from top to bottom, after 242 gain of difference amplifier；First reference voltage REF1 is set
Fixed principle is the voltage when the current direction for flowing through division module 210 is from bottom to top, after 242 gain of difference amplifier
< the first reference voltage REF1 < 0.
Control unit 250 includes processor and its peripheral circuit, and processor is ECU (Electronic Control
Unit, car running computer), or the controller (Microcontroller Unit, MCU) of motor, or cell tube
Reason system (Battery Management System, BMS), as single-chip microcontroller, DSP (Digital Signal Processing,
Digital Signal Processing) processor etc..Referring to Fig. 5, control unit 250 can be incited somebody to action with internal or external block converter 251
Detection level conversion is corresponding digital signal.Hereafter, primary positive and negative voltage square wave electricity will be loaded in detection loop 20 respectively
One group of four obtained digital signal of detection level conversions that stream signal obtains as the state of high-voltage interlocking loop 10 judge according to
According to.The processor 252 of so control unit 250 matches the digital value in preset table, to determine high-voltage interlocking
The state of loop." digital signal-malfunction " table that obtained digital signal and memory 253 are pre-stored by controller into
Row matching, to determine the current state of high-voltage interlocking loop 10.
About " digital signal-malfunction " table will by analysis high-voltage interlocking loop connect scene analysis to illustrate,
Please refer to Fig. 6:
1, high-voltage interlocking loop 10 connects normal scene analysis
When first switch 260 is closed, the current direction that positive voltage square wave current signal flows through division module 210 is from upper past
Under, the voltage at 210 both ends of division module exports positive voltage signal after the amplification of difference amplifier 242.First voltage comparator
243 are compared this voltage with preset the first reference voltage of negative voltage threshold REF1, due at this point, difference is put
The positive voltage signal numerical value that big device 242 exports is greater than preset first reference voltage REF1, and first voltage comparator 243 exports
" 0 ", i.e., the first detection level.Similarly, since preset second reference voltage REF2 is positive voltage threshold, difference amplifier
The forward voltage signal of 242 outputs is greater than preset second reference voltage REF2, and second voltage comparator 244 exports " 1 " at this time,
I.e. second detection level.
Similarly, when second switch 270 is closed, the current direction that negative voltage square wave current signal flows through division module 210 is
From bottom to top, difference amplifier 242 exports negative voltage signal, and this voltage signal is less than the first reference voltage REF1, then and the
One voltage comparator 243 exports " 1 ", i.e., third detects level；Difference amplifier 242 exports negative voltage signal, and this voltage is believed
Number be less than preset second reference voltage REF2, at this time second voltage comparator 244 export " 0 ", i.e., the 4th detection level to get
Level and malfunction relationship are detected to the following table 1.
Table 1:
| First detection level | Second detection level | Third detects level | 4th detection level | Malfunction |
| 0 | 1 | 1 | 0 | Connection is normal |
4, high-voltage interlocking loop 10 connects breaking scene analysis
Due to flowing through division module 210 without electric current at this time, the voltage that difference amplifier 242 exports is 0V always, first
The detection level that voltage comparator 243 and second voltage comparator 244 export is " 0 " to get to the following table 2 detection level and therefore
Hinder state relation.
Table 2:
| First detection level | Second detection level | Third detects level | 4th detection level | Malfunction |
| 0 | 0 | 0 | 0 | Connection open circuit |
3, high-voltage interlocking loop 10 is shorted to power supply Vbat scene analysis
When first switch 260 is closed, since high-voltage interlocking loop 10 is shorted to power supply Vbat, flowed through point without electric current at this time
Die block 210, therefore the first detection level and second voltage detection level are " 0 ".After second switch 270 is closed, flow through point
The electric current of die block 210 is that from bottom to top, third detection level and the 4th voltage detection levels are respectively " 1 " and " 0 " to get arriving
Following table detects level and malfunction relationship.
Table 3:
| First detection level | Second detection level | Third detects level | 4th detection level | Malfunction |
| 0 | 0 | 0 | 1 | It is short-circuited to power supply Vbat |
4, high-voltage interlocking loop 10 is shorted to power ground scene analysis
When the closure of first switch 260, since high-voltage interlocking loop 10 is shorted to power ground, the electricity of division module 210 is flowed through
Stream is from top to bottom, therefore the first detection level and second voltage detection level are respectively " 0 " and " 1 ".After executing step 104, this
When there is no electric current to flow through division module 210, third detection level and the 4th voltage detection levels are " 0 " examined to get to following table
Survey level and malfunction relationship.
Table 4:
| First detection level | Second detection level | Third detects level | 4th detection level | Malfunction |
| 1 | 0 | 0 | 0 | It is short-circuited to power ground |
In this way, above-mentioned table 1-4 is preset in the memory 253 of control unit 250, control unit 250 can basis
The current detection level combinations state of system, the working condition of accurate judgement high-voltage interlocking loop 10.
As it can be seen that the condition detection method and device of high-voltage interlocking loop drive HVIL loop using square wave current signal, by
It is single closed loop in loop, without duplexure, current signal will not change with length of transmission line, and signal is not present
Decaying, therefore there is farther transmission range, nearly all vehicle can be met to the general-purpose platform of 10 length of high-voltage interlocking loop
Demand.In addition, driving HVIL loop using square wave current signal, relative to voltage signal, square wave current signal has higher
Anti-interference ability and better stability, so that system is reliable with the anti-interference rejection ability of higher EMC and preferably
Property.Meanwhile high-voltage interlocking loop 10 is driven using bipolar square wave current signal, because it is with broader reversal peak acrometron
Value, compared to unipolarity square wave current signal, when carrying out the judgement of loop on off operating mode, the present invention has higher fault-tolerant ability
And robustness.In addition, can effectively identify different events by implementing dependent failure detection method to two groups of four level signals
Hinder type, including loop open circuit fault, loop are shorted to power supply Vbat failure, loop is shorted to earth fault etc., so as to fast
Speed investigation failure, saves maintenance time and cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (14)
1. a kind of condition detection method of high-voltage interlocking loop, which is characterized in that the high-voltage interlocking loop and a division module
Coupling forms detection loop, and the condition detection method includes:
In the positive voltage square wave current signal of detection loop load first frequency；
It detects the first signal component of the first frequency in the division module and exports the first detection level and the second inspection
Survey level；
In the negative voltage square wave current signal of detection loop load second frequency；
It detects the second signal component of the second frequency in the division module and exports third detection level and the 4th inspection
Survey level；
According to the first detection level, the second detection level, third detection level and the 4th detection level
Determine whether the high-voltage interlocking loop is abnormal.
2. condition detection method as described in claim 1, which is characterized in that the positive voltage square wave current signal and described negative
Voltage square wave current signal be output size of current be 10~30mA, frequency is 20~1000Hz, duty ratio is 20%~80%
PWM current signal.
3. condition detection method as claimed in claim 1 or 2, which is characterized in that the positive voltage square wave current signal and institute
Size of current, frequency and the duty ratio difference for stating negative voltage square wave current signal are identical.
4. condition detection method as described in claim 1, which is characterized in that described the in the detection division module
The first signal component and the first detection level of output of one frequency and the second detection level include:
Detect first voltage component and gain of the positive voltage square wave current signal load in the division module；
First voltage component after gain is exported to the first detection level compared with the first predetermined voltage threshold；
First voltage component after gain is exported to the second detection level compared with the second predetermined voltage threshold.
5. condition detection method as described in claim 1, which is characterized in that described the in the detection division module
The second signal component of two frequencies and export third detection level and the 4th detection level include:
Detect second voltage component and gain of the negative voltage square wave current signal load in the division module；
Second voltage component after gain is exported to third detection level compared with the first predeterminated voltage；
Second voltage component after gain is exported to the 4th detection level compared with the second predeterminated voltage.
6. condition detection method as described in claim 1, which is characterized in that described according to the first detection level, described
Second detection level, third detection level and the 4th detection level determine whether the high-voltage interlocking loop wraps extremely
It includes:
By it is described first detection level, it is described second detection level, the third detection level and it is described 4th detection level into
Row analog-to-digital conversion obtains corresponding digital value；
The digital value is matched in preset table, with the state of the determination high-voltage interlocking loop.
7. a kind of condition checkout gear of high-voltage interlocking loop, which is characterized in that the high-voltage interlocking loop and a division module
Coupling forms detection loop, and the condition checkout gear includes:
First signal generator is configured as loading the positive voltage square wave current signal of first frequency in the detection loop；
Detection unit is configured as detecting the first signal component of the first frequency in the division module and exports first
Detect level and the second detection level；
Second signal generator is configured as loading the negative voltage square wave current signal of second frequency in the detection loop；
The detection unit is additionally configured to detect the second signal component of the second frequency in the division module and defeated
Third detection level and the 4th detection level out；
Control unit, be configured as according to it is described first detection level, it is described second detection level, the third detection level and
The 4th detection level determines whether the high-voltage interlocking loop is abnormal.
8. condition checkout gear as claimed in claim 7, which is characterized in that the positive voltage square wave current signal and described negative
Voltage square wave current signal be output size of current be 10~30mA, frequency is 20~1000Hz, duty ratio is 20%~80%
PWM current signal.
9. condition checkout gear as claimed in claim 7 or 8, which is characterized in that the positive voltage square wave current signal and institute
Size of current, frequency and the duty ratio difference for stating negative voltage square wave current signal are identical.
10. condition checkout gear as claimed in claim 7, which is characterized in that the detection unit includes:
Differential amplification device is configured as detecting first of the positive voltage square wave current signal load in the division module
Component of voltage and gain；
First voltage comparator is configured as exporting the first voltage component after gain into the first inspection compared with the first predeterminated voltage
Survey level；
Second voltage comparator is configured as exporting the first voltage component after gain into the second inspection compared with the second predeterminated voltage
Survey level.
11. condition checkout gear as claimed in claim 10, it is characterised in that:
The differential amplification device is additionally configured to the of detection negative voltage square wave current signal load in the division module
Two component of voltage and gain；
The first voltage comparator is additionally configured to export the second voltage component after gain compared with the first predeterminated voltage
Third detects level；
The second voltage comparator is additionally configured to export the second voltage component after gain compared with the second predeterminated voltage
4th detection level.
12. condition checkout gear as claimed in claim 7, which is characterized in that described control unit includes:
Analog-digital converter, be configured as by it is described first detection level, it is described second detection level, the third detection level and
The 4th detection level carries out analog-to-digital conversion and obtains corresponding digital value；
Processor is configured as matching the digital value in preset table, with the determination high-voltage interlocking loop
State；And
Memory is stored with the preset table.
13. condition checkout gear as claimed in claim 7, which is characterized in that the division module is by resistance, inductance and electricity
The circuit of at least one of appearance composition.
14. a kind of automobile, which is characterized in that including the described in any item high-voltage interlocking detection devices of claim 7 to 13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001521.3A CN109188169A (en) | 2018-08-30 | 2018-08-30 | Condition detection method, device and the automobile of high-voltage interlocking loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001521.3A CN109188169A (en) | 2018-08-30 | 2018-08-30 | Condition detection method, device and the automobile of high-voltage interlocking loop |
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| Publication Number | Publication Date |
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| CN109188169A true CN109188169A (en) | 2019-01-11 |
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|---|---|---|---|
| CN201811001521.3A Pending CN109188169A (en) | 2018-08-30 | 2018-08-30 | Condition detection method, device and the automobile of high-voltage interlocking loop |
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| CN110967617A (en) * | 2019-02-25 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
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| CN112462163A (en) * | 2020-10-30 | 2021-03-09 | 广州汽车集团股份有限公司 | High-voltage interlocking loop fault detection method and device |
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