CN105929325A - Relay adhesion detection circuit and relay adhesion detection method - Google Patents
Relay adhesion detection circuit and relay adhesion detection method Download PDFInfo
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- CN105929325A CN105929325A CN201610417794.0A CN201610417794A CN105929325A CN 105929325 A CN105929325 A CN 105929325A CN 201610417794 A CN201610417794 A CN 201610417794A CN 105929325 A CN105929325 A CN 105929325A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The embodiment of the invention provides a relay adhesion detection circuit and a relay adhesion detection method. Relay adhesion detection circuitry including the power of establishing ties in order, with the anodal main positive relay that links to each other of power, load and with the first loop that the main negative relay that links to each other of power negative pole constitutes, the load is the parallel circuit that electric capacity and resistance constitute, still include with main positive relay or the parallelly connected current detection branch road of main negative relay, the current detection branch road includes diode, current source and the current sensor of establishing ties. The relay adhesion detection circuit of the embodiment of the invention improves the accuracy and the detection speed of relay adhesion detection.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of relay adhesion testing circuit and relay
Device adhesion detection method.
Background technology
Electric automobile is the new forms of energy industry that country vigorously advocates.As the automobile relying on electric energy to operate,
Battery system (referring to the power supply of electric automobile) is the core component of electric automobile.Electric automobile high-voltage master
Loop Control the electric discharge of battery system, and the reliably working of this relay is directly connected to electronic
The safety problem of automobile.Electric automobile works under relay adhesion state and will be likely to result in safe thing
Therefore.If the adhesion detection to relay is reported by mistake, electric automobile will start.Therefore,
BMS (Battery Management System, battery management system) needs detection to be reliably adopted as a child
Electrical equipment adhesion state.
Fig. 1 is the structural representation of electric automobile high-voltage major loop.As it is shown in figure 1, electric automobile is high
Pressure major loop includes the power supply V of series connection, the positive relay K of master 1 being connected with power supply V positive pole, load
L and the master being connected with power supply V negative pole bear the first loop of relay K 3 composition, wherein, load L
For the parallel circuit being made up of electric capacity C0 and resistance R0.In electric automobile high-voltage major loop, power supply
V is generally set of cells.Visible, load L is a capacitive load.Load L is in electric automobile
Motor, wherein, electric capacity C0 is the electric capacity of motor inverter.Herein, by the two ends of power supply V
Voltage difference is referred to as PACK voltage, and the voltage difference at load L two ends is referred to as LINK voltage.Power supply V
Positive pole and the voltage of negative pole place end be respectively PACK+ voltage and PACK-voltage, load L two
The voltage of end is respectively LINK+ and LINK-voltage.Therefore, the both end voltage of positive relay K 1 is led
Being called PACK+ voltage and LINK+ voltage, the both end voltage of main negative relay K 3 is respectively
PACK-voltage and LINK-voltage.
Traditional relay adhesion detection use voltage detection method (the most respectively the main positive relay of detection and
The voltage at main negative relay two ends), and it is provided with the strongest discharge loop, because motor inverter
Electric capacity C0 is very big, and without the strongest discharge loop, voltage declines will be very slow, and
The permagnetic synchronous motor that electric automobile is used has energy feedback ability.
In use there will be damage, and discharge loop meeting heat production due to discharge loop, therefore exist
In the case of considering that capacitor will not be touched, discharge loop had better not be set.But it is not provided with electric discharge
In the case of loop, because the existence of electric machine controller electric capacity C0, and road conditions difference electric power generation
Effect exists, continuous power-on and power-off, naturally release without bleeder resistance, the factor such as motor feedback, work as appearance
When the situation that the capacitive load end LINK voltage of relay is close with PACK voltage,
PACK-LINK voltage detection method will be considered that adhesion occurs in relay, but actually relay is not
Adhesion, thus cause detection mistake.Meanwhile, in the case of being not provided with discharge loop, due to voltage
Decline very slow, detection overlong time, detection overlong time can be caused to mean to detect not in time, meeting
The biggest potential safety hazard is caused to electric automobile.
Summary of the invention
It is an object of the invention to provide a kind of relay adhesion testing circuit and relay adhesion detection
Method, improves the accuracy of relay adhesion detection, and improves detection speed.
For achieving the above object, the present invention proposes a kind of relay adhesion testing circuit, including sequentially
Series connection power supply, relay positive with the master that described positive source is connected, load and with described power cathode
The master being connected bears the first loop of relay composition, and described load is the electricity in parallel of electric capacity and resistance composition
Road, also includes that relay positive with described master or described master bear the current detecting branch road that relay is in parallel, institute
State current detecting branch road and include diode, current source and the current sensor of series connection.
Further, above-mentioned relay adhesion testing circuit also can have the characteristics that, described electric current is examined
Survey the current-limiting resistance that branch road also includes connecting with described diode, current source and current sensor.
Further, above-mentioned relay adhesion testing circuit also can have the characteristics that, described electric current is examined
Survey the critesistor that branch road also includes connecting with described diode, current source and current sensor.
Further, above-mentioned relay adhesion testing circuit also can have the characteristics that, described electric current is examined
Survey the switch that branch road also includes connecting with described diode, current source and current sensor.
Further, above-mentioned relay adhesion testing circuit also can have the characteristics that, also includes and institute
State the first voltage detecting branch road of current detecting branch circuit parallel connection, and/or, relay positive with described master and institute
State the second electricity not in parallel with the relay of described current detecting branch circuit parallel connection in main negative both relays
Pressure detection branch.
The relay adhesion testing circuit of the embodiment of the present invention, not only increases relay adhesion detection
Accuracy and reliability, and detect that speed is fast, testing cost is low, efficiency is high.
For achieving the above object, the present invention proposes a kind of based on aforesaid relay adhesion testing circuit
Relay adhesion detection method, including:
Disconnect main positive relay and main negative relay；
Whether detection current sensor has signal；
Judge that the positive relay of described master and described master bear relay whether adhesion according to testing result.
Further, said method also can have the characteristics that, described according to testing result judgement
Main positive relay or described master bear relay whether adhesion, including:
It is, in the case of current sensor has signal, to monitor the state of described signal in testing result；
State according to the described signal monitored determines relay adhesion occur；
Wherein, determine that relay adhesion occur includes according to the state of the described signal monitored:
Monitor described signal in stable condition in the case of, determine that the positive relay of described master occurs viscous
Even；Or,
In the case of the state monitoring described signal changes, determine that described master bears relay and occurs viscous
Even.
Further, said method also can have the characteristics that, described according to testing result judgement
Main positive relay or described master bear relay whether adhesion, including:
In the case of testing result is current sensor no signal, it is determined that the positive relay of described master and institute
State main negative relay and adhesion does not all occur.
The relay adhesion detection method of the embodiment of the present invention, detects electronic by the way of current detecting
The whether adhesion of relay in automobile high pressure major loop, accuracy and reliability are high, and detection speed is fast.
For achieving the above object, the present invention proposes a kind of based on aforesaid relay adhesion testing circuit
Relay adhesion detection method, including:
Disconnect main positive relay and keep main negative relay to connect；
After postponing setting time or current transducer signal disappearance, disconnect described master and bear relay；
The signal of detection current transformer；
Determine that the positive relay of described master and described master bear the adhesion situation of relay according to testing result.
Further, said method also can have the characteristics that, described determine according to testing result described
Main positive relay and described master bear the adhesion situation of relay, including:
In the case of testing result is current transformer no signal, confirm that the positive relay of described master does not glues
Even, or,
It is in the case of current transducer signal delays to reach in testing result, confirms the positive relay of described master
Device adhesion.
The relay adhesion detection method of the embodiment of the present invention, detects electronic by the way of current detecting
The whether adhesion of relay in automobile high pressure major loop, accuracy and reliability are high, and detection speed is fast.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required in embodiment
Accompanying drawing to be used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some bright embodiments, for those of ordinary skill in the art, are not paying creative work
On the premise of, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of electric automobile high-voltage major loop.
Fig. 2 is one of structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 3 is the two of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 4 is the three of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 5 is the four of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 6 is the five of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 7 is the six of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.
Fig. 8 is a kind of concrete structure schematic diagram of current detecting branch road in Fig. 2.
Fig. 9 is one of flow chart of embodiment of the present invention repeat circuit adhesion detection method.
Figure 10 is the two of the flow chart of embodiment of the present invention repeat circuit adhesion detection method.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, illustrated embodiment is served only for solving
Release the present invention, be not intended to limit the scope of the present invention.For those of ordinary skill in the art,
On the premise of not paying creative work, all embodiments obtained according to present invention spirit, all
Belong to protection scope of the present invention.
Although it should be noted that may use in embodiments of the present invention term first, second, the
The third XXX that describes, but these XXX should not necessarily be limited by these terms.These terms are only used for will
XXX is distinguished from each other out.Such as, in the case of without departing from range of embodiment of the invention, an XXX
Can also be referred to as the 2nd XXX, similarly, the 2nd XXX can also be referred to as an XXX.
Fig. 2 is one of structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 2, in the present embodiment, relay adhesion testing circuit includes the electric automobile high-voltage shown in Fig. 1
Major loop, this electric automobile high-voltage major loop includes the power supply V of series connection, main positive relay K 1, bears
Carrying L and the first loop of main negative relay K 3 composition, wherein, load L is by electric capacity C0 and electricity
The parallel circuit of resistance R0 composition, relay adhesion testing circuit also includes with main positive relay K 1 also
The current detecting branch road of connection, this current detecting branch road includes diode D, current source I and the electricity of series connection
Flow sensor S.
In other embodiments of the present invention, current detecting branch road can also be in parallel with main negative relay K 3.
The operation principle of the testing circuit of relay adhesion shown in Fig. 2 is: in main positive relay K 1 with main
In the case of negative relay K 3 disconnects, if current sensor S does not has signal, current sense is described
The current detecting subcircuits at device S place does not has electric current, can be determined that main positive relay K 1 accordingly
Bear what relay K 3 was all off with main；If current sensor S has signal, illustrate that circuit has
Electric current, can be determined that the situation that there is relay adhesion accordingly.Then further according to current sensor S's
Signal condition determines whether main positive relay K 1 or main negative relay K 3 occurs in that adhesion feelings
Condition.If the signal of current sensor is constantly in steady statue (referring to that signal magnitude, power are constant),
Then can be determined that main positive relay K 1 occurs in that adhesion situation, if the signal of current sensor S goes out
(change here refers to that electric current reduces, when electric current is provided by external capacitive, along with electric capacity in now change
Energy shifts to power source internal, and capacitance voltage declines, and electric current reduces in proportion), then can be determined that master
Negative relay K 3 occurs in that adhesion situation.
In Fig. 2, power supply V can be set of cells.
The diode D of current detecting branch road, current source I and the string of current sensor S three in Fig. 2
Connection order can be arbitrary.
The principle of current sensor is, the output signal of current sensor and loop, current sensor place
Current in proportion change.
When main positive relay K 1 adhesion, current detecting branch road is equivalent to short circuit, current detecting branch road
In electric current provided by current source I, voltage PACK+ is always equal to LINK+, now electric current
The signal of sensor S is stable.When main negative relay K 3 adhesion, be equivalent at electric capacity C0
One power supply of upper superposition, the energy in electric capacity C0 passes through optocoupler and current detecting Zhi Luxiang power supply V
Transfer, the most necessarily causes the change of electric capacity C0 voltage, and now change in voltage can embody LINK+,
Voltage LINK+ is caused to change, so that change occurs in the signal of current sensor S.
Relay adhesion testing circuit shown in Fig. 2 has the advantages that
One is, detects main positive relay K 1 or main negative relay K 3 is by the way of current detecting
No adhesion, therefore avoid both end voltage PACK+ of main positive relay K 1 and LINK+ close to time
Or both end voltage PACK-of main negative relay K 3 and LINK-close to time the feelings of error detection occur
Condition, thus improve accuracy and the reliability of relay adhesion detection；
Two are, owing to current sensor is very fast to the response of electric current, therefore to relay whether adhesion
Detection speed quickly；
Three are, circuit is simple, and the device of needs is little, thus reduce the one-tenth of relay adhesion detection
This；
Four are, the electric energy of the electric capacity C0 of load L can be returned by the current source I in current detecting branch road
Receive power supply V (principle is: the voltage of the voltage of current source I+electric capacity C0 > voltage of power supply V,
The electricity making electric capacity C0 is recovered in power supply V, and end-state is, the voltage of current source I+electric capacity C0
The voltage of voltage=power supply V), reclaim with electric energy and instead of traditional bleeder resistance and release or naturally let out
The electric energy processing mode put, energy loss is little, and therefore efficiency is high.
Therefore, the relay adhesion testing circuit of the embodiment of the present invention, not only increase relay
The accuracy of adhesion detection and reliability, and detect that speed is fast, testing cost is low, efficiency is high.
Fig. 3 is the two of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 3, compared to the embodiment shown in Fig. 2, the current detecting branch road in the present embodiment also includes
The current-limiting resistance Rx connected with diode D, current source I and current sensor S.Due to power supply V,
First loop of main positive relay K 1, load L and main negative relay K 3 composition is a high tension loop,
The voltage of power supply V is very big, if main positive relay K 1 or main negative relay K 3 exist the feelings of adhesion
Condition, arises that electric current in current detecting branch road, owing to the voltage of power supply V is very big, causes electric current to examine
Surveying the electric current in branch road also can be very big, and this may result in the component damage in current detecting branch road,
Cannot normally work.Operating current can be set within the specific limits by current-limiting resistance Rx.
Owing to the current detecting branch road of the relay adhesion testing circuit shown in Fig. 3 being in series with current limliting electricity
Resistance Rx, therefore has higher reliability compared to the relay adhesion testing circuit shown in Fig. 2.
Fig. 4 is the three of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 4, compared to the embodiment shown in Fig. 2, the current detecting branch road in the present embodiment also includes
Critesistor PTC (the Positive connected with diode D, current source I and current sensor S
Temperature Coefficient, the critesistor of positive temperature coefficient).In abnormal cases, when just leading
When relay K 1 disconnects, LINK+ voltage closes higher than PACK+ voltage and main negative relay K 3,
Current detecting branch road has certain charge effects to power supply V.Critesistor PTC is prevented from circuit
Electric current excessive and damage the components and parts in circuit, so that circuit has higher reliability.
It is visible, owing to the current detecting branch road of the relay adhesion testing circuit shown in Fig. 4 being in series with
Critesistor PTC, therefore compared to the relay adhesion testing circuit shown in Fig. 2 have higher can
By property.
Fig. 5 is the four of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 5, compared to the embodiment shown in Fig. 2, the current detecting branch road in the present embodiment also includes
The switch K2 connected with diode D, current source I and current sensor S.
The setting of switch K2 is so that judging that PACK+ voltage is less with LINK+ voltage phase difference
After (now lead positive relay K 1 and/or main relay K 3 of bearing may have the situation of adhesion) more right
Current detecting branch road powers on, to judge that main positive relay K 1 the most really disconnects.Meanwhile, switch K2
Setting make that power supply V, main positive relay K 1, load L and main negative relay K 3 be composed in series the
Primary Ioops when main negative relay K 3 all closes (lead positive relay K 1 and) when normally working, can
So that current detecting branch road is disconnected, to save energy.Therefore, compared to the embodiment shown in Fig. 2,
Relay adhesion testing circuit shown in Fig. 5 can save energy, thus cost-effective.
In embodiments of the present invention, on the basis of current detecting branch road shown in Fig. 2, current detecting is propped up
Road can include any one or more among current-limiting resistance Rx, critesistor PTC, switch K2,
They exist in current detecting branch road the most in series.
Fig. 6 is the five of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 6, compared to the embodiment shown in Fig. 2, the current detecting branch road in the present embodiment also includes
The switch K2 connected with diode D, current source I and current sensor S, relay adhesion detection electricity
Road also includes the first voltage detecting branch road with current detecting branch circuit parallel connection.This first voltage detecting branch road
For detect relay (refer to the relay in parallel with voltage detecting branch road and current detecting branch road,
Fig. 6 is main positive relay K 1) voltage at two ends.
Seeing Fig. 6, this first voltage detecting branch road can include the first resistance R1 of series connection, the second electricity
Resistance R2, the 3rd resistance R3 and the 4th resistance R4.Wherein, the second resistance R2 and the 3rd resistance R3
Binding site ground connection BMS_GND.
The relay adhesion Cleaning Principle of circuit shown in Fig. 6 is: when the first voltage detecting branch road detects
When PACK+ voltage is less with LINK+ voltage phase difference, by the switch in closed path detection branch
Current detecting branch road is powered on by K2, with negative by the main positive relay K 1 of current detecting branch road detection and master
Relay K 3 the most really disconnects.
The relay adhesion detection process of circuit shown in Fig. 6 is:
In the case of main positive relay K 1 and main negative relay K 3 all disconnect, first pass through first
Voltage detecting branch road determines the voltage difference between PACK+ and LINK+, if PACK+ and LINK+
Between voltage phase difference less (refer to less than set threshold value, this threshold value could be arranged to total voltage
5%-20%), and current detecting branch road there is electric current, then prove main positive relay K 1 or main negative relay
Device K3 adhesion；
If the first voltage detecting branch road determines that the voltage difference between PACK+ with LINK+ differs bigger
(more than the threshold value set, this threshold value could be arranged to the 5%-20% of total voltage), illustrates main positive relay
Device K1 and main negative relay K 3 the most normally disconnect, and adhesion situation the most do not occur.
In a particular application, in order to ensure that reliability judges, can repeatedly power on, lower electricity, see
Examine the change in voltage situation of PACK+ and LINK+, repeatedly confirm.
The principle distinguishing main positive relay K 1 or main negative relay K 3 adhesion is:
Main positive relay K 1 adhesion is equivalent to the whole current detecting branch road of short circuit, current detecting branch road
Electric current be that current source I provides, PACK+ is always equal to LINK+.
Main negative relay K 3 adhesion is equivalent on electric capacity C0 one power supply of superposition, in electric capacity C0
Energy shifted by optocoupler and current detecting Zhi Luxiang power supply V, the most necessarily cause electric capacity C0 electricity
The change of pressure, now change in voltage can embody LINK+.Voltage can pass through electric current loop after changing
The main positive relay K 1 of road differentiation or main negative relay K 3 adhesion:
If K3 adhesion, the current loop of formation is: power supply V → electric capacity C0 → current sensor S
→ current source I → diode D → power supply V；
If K1 adhesion, the current loop of formation is: current source I → diode D → current sensor
S → current source I.
Fig. 7 is the six of the structural representation of embodiment of the present invention repeat circuit adhesion testing circuit.Such as figure
Shown in 7, compared to the embodiment shown in Fig. 6, the relay adhesion testing circuit in the present embodiment is also
Including the second voltage detecting branch road in parallel with main negative relay K 3.This second voltage detecting branch road is used
Voltage in main negative relay K 3 two ends of detection.
Seeing Fig. 7, this second voltage detecting branch road can include the 5th resistance R5 of series connection, the 6th electricity
Resistance R6, the 7th resistance R7 and the 8th resistance R8.Wherein, the 6th resistance R6 and the 7th resistance R7
Binding site ground connection BMS_GND.
The relay adhesion detection process of circuit shown in Fig. 7 is: first determine whether that main positive relay K 1 is glued
Even state, then judges main negative relay K 3 adhesion state, and detailed process is as follows:
First disconnect main positive relay K 1 and keep main negative relay K 3 to connect, postponing 300ms (in the least
Second) after leakage current, or after current sensor S blackout, disconnect main negative relay K 3.As
After resolutely opening main negative relay K 3, current sensor S blackout, then prove that electric capacity is released,
The main positive non-adhesion of relay K 1, (i.e. will be detailed below by the both end voltage of main negative relay K 3 is poor
The second voltage difference mentioned) judge main negative relay K 3 adhesion situation；
After main negative relay K 3, current sensor S signal delay arrives, and loop is described
In still have electric current, main positive relay K 1 adhesion is described.
Fig. 8 is a kind of concrete structure schematic diagram of current detecting branch road in Fig. 2.In Fig. 8, current source
I is made up of DC-DC converter, electric capacity Cd.
In Fig. 8, the circuit in dotted line frame be current source I implement circuit.
In Fig. 8, photoconductive resistance Dg and audion T (in square frame) is the concrete real of current sensor
Existing circuit.Opto is photoelectrical coupler, referred to as optocoupler.
In Fig. 8, signal to BMS refers to that current sensor exports to the signal of battery management system.
BMS out ctrl is that battery management system exports to the control signal of switch K2.
In Fig. 8, current source I includes that DC-DC converter, DC-DC converter are connected with low-tension supply,
DC-DC converter receives device for relay adhesion testing circuit and current signal simultaneously and (refers in Fig. 8
T) power supply.Current signal receives device and current signal passes to battery management system BMS
Calculate and judge.
The invention allows for a kind of relay adhesion based on aforesaid relay adhesion testing circuit
Detection method.The method can apply to detect whether the relay of electric automobile high-voltage major loop glues
Even.
Fig. 9 is one of flow chart of embodiment of the present invention repeat circuit adhesion detection method.Such as Fig. 9 institute
Showing, in the present embodiment, relay adhesion detection method may include steps of:
Step S901, disconnects main positive relay and main negative relay；
Step S902, whether detection current sensor has signal；
Step S903, judges the whether adhesion of main positive relay and main negative relay according to testing result.
In embodiments of the present invention, step S903 may include steps of: in testing result for electric
In the case of flow sensor has signal, monitor the state of this signal；Shape according to this signal monitored
State determines relay adhesion occur.
Wherein, determine that according to the state monitored occurring that the relay of adhesion may include that is monitoring
This signal in stable condition in the case of, determine that adhesion occurs in main positive relay.
Wherein, determine that according to the state monitored occurring that the relay of adhesion may include that is monitoring
In the case of the state change of this signal, determine that adhesion occurs in main negative relay.
In embodiments of the present invention, step S903 may include steps of: in testing result for electric
In the case of flow sensor no signal, it is determined that main positive relay and described master bear relay and all do not occur gluing
Even.
The relay adhesion detection method of the embodiment of the present invention, detects electronic by the way of current detecting
The whether adhesion of relay in automobile high pressure major loop, accuracy and reliability are high, and detection speed is fast.
Figure 10 is the two of the flow chart of embodiment of the present invention repeat circuit adhesion detection method.Such as Figure 10
Shown in, in the present embodiment, relay adhesion detection method may include steps of:
Step S1001, disconnects main positive relay and keeps main negative relay to connect；
Step S1002, after postponing setting time or current transducer signal disappearance, disconnects main negative relay
Device；
Step S1003, the signal of detection current transformer；
Step S1004, determines main positive relay and main negative relay according to step S1003 testing result
Adhesion situation.
In embodiments of the present invention, step S1004 may include that in testing result be current transformer
In the case of no signal, confirm the main non-adhesion of positive relay.Now, relay adhesion detection method can
To farther include following steps: determine that main negative relay is according to the both end voltage difference of main negative relay
No adhesion.If the both end voltage difference of main negative relay is less, main negative relay adhesion is described, if
The both end voltage difference of main negative relay is relatively big, and the main negative non-adhesion of relay is described.
In embodiments of the present invention, step S1004 may include that in testing result be current transformer
In the case of signal delay arrives, confirm main positive relay adhesion.
The relay adhesion detection method of the embodiment of the present invention, detects electronic by the way of current detecting
The whether adhesion of relay in automobile high pressure major loop, accuracy and reliability are high, and detection speed is fast.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in
Within protection scope of the present invention.
Claims (10)
1. a relay adhesion testing circuit, including power supply in sequential series and described power supply just
The positive relay of master, load and the master that is connected with described power cathode being extremely connected bear that relay forms the
Primary Ioops, described load be electric capacity and resistance composition parallel circuit, it is characterised in that also include with
The positive relay of described master or described master bear the current detecting branch road that relay is in parallel, and described current detecting is propped up
Road includes diode, current source and the current sensor of series connection.
Relay adhesion testing circuit the most according to claim 1, it is characterised in that described
Current detecting branch road also includes the current limliting electricity connected with described diode, current source and current sensor
Resistance.
Relay adhesion testing circuit the most according to claim 1, it is characterised in that described
Current detecting branch road also includes the temperature-sensitive electricity connected with described diode, current source and current sensor
Resistance.
Relay adhesion testing circuit the most according to claim 1, it is characterised in that described
Current detecting branch road also includes the switch connected with described diode, current source and current sensor.
Relay adhesion testing circuit the most according to claim 4, it is characterised in that also wrap
Include the first voltage detecting branch road with described current detecting branch circuit parallel connection, and/or, relay positive with described master
Device and described master bear in relay not in parallel with the relay of described current detecting branch circuit parallel connection
Second voltage detecting branch road.
6. relay adhesion based on the relay adhesion testing circuit described in claim 1 inspection
Survey method, it is characterised in that including:
Disconnect main positive relay and main negative relay；
Whether detection current sensor has signal；
Judge that the positive relay of described master and described master bear relay whether adhesion according to testing result.
Relay adhesion detection method the most according to claim 6, it is characterised in that described
Judge that the positive relay of described master or described master bear relay whether adhesion according to testing result, including:
It is, in the case of current sensor has signal, to monitor the state of described signal in testing result；
State according to the described signal monitored determines relay adhesion occur；
Wherein, determine that relay adhesion occur includes according to the state of the described signal monitored:
Monitor described signal in stable condition in the case of, determine that the positive relay of described master occurs viscous
Even；Or,
In the case of the state monitoring described signal changes, determine that described master bears relay and occurs viscous
Even.
Relay adhesion detection method the most according to claim 6, it is characterised in that described
Judge that the positive relay of described master or described master bear relay whether adhesion according to testing result, including:
In the case of testing result is current sensor no signal, it is determined that the positive relay of described master and institute
State main negative relay and adhesion does not all occur.
9. relay adhesion based on the relay adhesion testing circuit described in claim 1 inspection
Survey method, it is characterised in that including:
Disconnect main positive relay and keep main negative relay to connect；
After postponing setting time or current transducer signal disappearance, disconnect described master and bear relay；
The signal of detection current transformer；
Determine that the positive relay of described master and described master bear the adhesion situation of relay according to testing result.
Relay adhesion detection method the most according to claim 12, it is characterised in that institute
State and determine that the positive relay of described master and described master bear the adhesion situation of relay according to testing result, bag
Include:
In the case of testing result is current transformer no signal, confirm that the positive relay of described master does not glues
Even；Or,
It is in the case of current transducer signal delays to reach in testing result, confirms the positive relay of described master
Device adhesion.
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