CN109541457A - Power battery high-voltage relay control circuit and method for diagnosing faults - Google Patents

Power battery high-voltage relay control circuit and method for diagnosing faults Download PDF

Info

Publication number
CN109541457A
CN109541457A CN201910008507.4A CN201910008507A CN109541457A CN 109541457 A CN109541457 A CN 109541457A CN 201910008507 A CN201910008507 A CN 201910008507A CN 109541457 A CN109541457 A CN 109541457A
Authority
CN
China
Prior art keywords
control circuit
resistance
edge switch
switches
voltage relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910008507.4A
Other languages
Chinese (zh)
Inventor
隋建鹏
王强
闻继伟
杨莉
赵楠楠
焦育成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN201910008507.4A priority Critical patent/CN109541457A/en
Publication of CN109541457A publication Critical patent/CN109541457A/en
Pending legal-status Critical Current

Links

Classifications

    • 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 power battery high-voltage relay control circuits, which is characterized in that including high side switches control circuit and lower edge switch control circuit.Power battery high-voltage relay control circuit of the invention includes high side switches control circuit and lower edge switch control circuit, and high-voltage relay passes through the conducting or shutdown of high side switches control circuit and lower edge switch control circuit co- controlling high-voltage relay.High side switches control circuit and lower edge switch control diagnostic circuit of having, it can be according to the voltage of fault diagnosis signal and the relational implementation high side switches of diagnostic threshold voltage and lower edge switch fault diagnosis, judge and distinguish open circuit, be shorted to ground, be shorted to power failure, fault diagnosis coverage rate reaches 99%.Hardware structure measurement and random hardware crash rate index meet the security target of safety integrity level ASIL-C or ASIL-D.

Description

Power battery high-voltage relay control circuit and method for diagnosing faults
Technical field
The present invention relates to electric vehicle technical field of electronic control, especially power battery of electric vehicle high-voltage relay control electricity Road and method for diagnosing faults.
Background technique
With the development of new-energy automobile technology, electric car has become the important directions of automotive technology development.In electricity In electrical automobile, the security performance of power battery control system is the most important content of vehicle performance superiority and inferiority performance.It is assured in battery In reason system, battery control unit is the core of power battery control system, and whether high-voltage relay controls power battery to drive Dynamic system output power.
The automotive safety integrity level of battery pack management system is generally defined as ASIL-C or ASIL-D grade (ASIL For automotive safety integrity level, there are four grades, respectively A, B, C, D, and wherein A is minimum grade, and D is highest etc. Grade), and the control of existing high-voltage relay is controlled using the hardware structure of 1 lower edge switch, in this hardware circuit topology Under, the hardware structure measurement (including Single Point of Faliure measurement and latent fault measurement) and random hardware crash rate of battery control unit Index is difficult to meet automotive safety integrity level ASIL-C or ASIL- as defined in road vehicle Functional Safety Standard ISO26262 The security target of D.Especially when the fault diagnosis coverage rate of the lower edge switch circuit of high-voltage relay control is not very high (Single Point of Faliure measurement >=99%, latent fault diagnosis coverage rate >=90%), the hardware structure measurement of battery control unit and with Machine hardware failure rate index can not achieve the security target of safety integrity level ASIL-C or ASIL-D.
High-voltage relay control is controlled using the hardware structure of 1 lower edge switch, when there is short trouble, in order to It realizes defencive function, needs fuse and more harness.And when the hardware structure of high side switches being used to be controlled, pass through flash Defencive function can be thus achieved in switch.Compared with the hardware structure of high side switches, the system architecture of lower edge switch is complicated, and does not have There is cost advantage, as depicted in figs. 1 and 2.
Summary of the invention
It is an object of the present invention to provide a kind of power battery high-voltage relay control circuit and method for diagnosing faults, which solve The hardware structure measurement and random hardware crash rate index of battery control unit are difficult to meet automotive safety as defined in ISO26262 The technical issues of integrity levels horizontal ASIL-C or ASIL-D.
The present invention solves technical problem and adopts the following technical scheme that a kind of power battery high-voltage relay control circuit, Including high side switches control circuit and lower edge switch control circuit;
An output port of the first end connection MCU of the high side switches control circuit, high side switches control circuit Second end connection high-voltage relay coil one end, high side switches control circuit third end connection MCU an A/D it is defeated Inbound port;
An output port of the first end connection MCU of the lower edge switch control circuit, lower edge switch control circuit Second end connection high-voltage relay coil the other end, lower edge switch control circuit third end connection MCU an A/D Input port, an output port of the 4th end connection security module of lower edge switch control circuit.
Optionally, the high side switches control circuit include: intelligent power high side switches U1, diode D1, resistance R1, Resistance R2, resistance R3, resistance R4, resistance RGND, capacitor C1 and capacitor CF
The control signal IN of the intelligent power high side switches U1 as the high side switches control circuit first End inputs the control signal V of high side switches control circuitINH, and connect an output port of MCU;
The power end V of the intelligent power high side switches U1BATConnect 12V battery positive voltage;The intelligent power is high The ground terminal GND of side switch U1 passes through resistance RGNDGround connection;The output end OUT of the intelligent power high side switches U1 is as institute The second end of high side switches control circuit is stated, one end of resistance R1 is connected;The other end of resistance R1 connects 12V battery positive voltage; The plus earth of the diode D1, the output end OUT of the cathode connection intelligent power high side switches U1 of the diode D1;
One end of resistance R2, the resistance R3 and resistance R4 link together;The other end of resistance R4 connects intelligent function The output end OUT of rate high side switches U1;The other end of resistance R2 connects digital supply voltage VDD5;Another termination of resistance R3 Ground;Capacitor C1 is connected in parallel on the both ends of resistance R3;The common end of resistance R2, resistance R3 and resistance R4 are the output end of diagnostic signal, As the third end of the high side switches control circuit, the fault diagnosis signal V of high side switches control circuit is exportedDIAGH
Optionally, the lower edge switch control circuit include: intelligent power lower edge switch U2, triode Q1, resistance R5, Resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11 and capacitor C2;
The control signal IN of the intelligent power lower edge switch U2 as the lower edge switch control circuit first End inputs the control signal V of lower edge switch control circuitINL, and connect by resistance R8 an output port of the MCU;
The ground terminal S of the intelligent power lower edge switch U2 is grounded, the output of the intelligent power lower edge switch U2 Hold second end of the D as the lower edge switch control circuit;The control of one end connection intelligent power lower edge switch U2 of resistance R9 Input terminal IN, other end ground connection;The control signal IN of the collector connection intelligent power lower edge switch U2 of triode Q1, three poles The emitter of pipe Q1 is grounded;The base stage and emitter of resistance R11 connecting triode Q1;One end connecting triode Q1 of resistance R10 Base stage, fourth end of the resistance R10 other end as the lower edge switch control circuit, connect electronic control unit security module An output port;
One end of resistance R5, the resistance R6 and resistance R7 link together, and the other end of resistance R7 connects intelligent function The output end D of rate lower edge switch U2;The other end of resistance R5 connects digital supply voltage VDD5;The other end of resistance R6 is grounded; Capacitor C2 is connected in parallel on the both ends of resistance R6;The common end of resistance R5, resistance R6 and resistance R7 are the output end of diagnostic signal, as The third end of the lower edge switch control circuit exports the fault diagnosis signal V of lower edge switch control circuitDIAGL
Optionally, the working condition of security module real-time monitoring MCU, when monitoring that MCU work occurs abnormal, safe mould Block exports lower edge switch control circuit enable signal VEN, and lower edge switch control circuit is turned off.
The present invention solves the event that technical problem adopts the following technical scheme that a kind of power battery high-voltage relay control circuit Hinder diagnostic method comprising the fault diagnosis of high side switches control circuit and the fault diagnosis of lower edge switch control circuit;
Wherein, the fault diagnosis of the high side switches control circuit includes:
The fault diagnosis signal V of high side switches control circuit is read in MCU timingDIAGH;Corresponding lower edge switch is controlled into electricity Road is in the conductive state, and judges whether lower edge switch control circuit breaks down, if event occurs for lower edge switch control circuit Barrier, then terminate the fault diagnosis of high side switches control circuit;
As the control signal V of high side switches control circuitINHWhen for low level state, if the fault diagnosis signal read VDIAGHGreater than 4.5V, then to judge that high-voltage relay high side switches exist between high-voltage relay to power supply short circuit failure;Such as The fault diagnosis signal V that fruit is readDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;Otherwise, Show high-voltage relay high side switches between high-voltage relay under high side switches off state it is working properly;
In the control signal V of high side switches control circuitINHWhen for high level state, if the fault diagnosis signal read VDIAGHLess than 1.5V, then to judge high-voltage relay high side switches, between high-voltage relay, there are shorted to earth failures;Otherwise, Show high-voltage relay high side switches between high-voltage relay under high side switches on state it is working properly;
In high-voltage relay high side switches between high-voltage relay, under high side switches off state and under on state In the case where all working properly, then judge high-voltage relay high side switches to normal between high-voltage relay;
The fault diagnosis of the lower edge switch control circuit includes:
The fault diagnosis signal V of lower edge switch control circuit is read in the MCU timingDIAGL;By corresponding high side switches Control circuit is in the conductive state, and judges whether high side switches control circuit breaks down, if high side switches control circuit It breaks down, then terminates the fault diagnosis of lower edge switch control circuit;
As the control signal V of lower edge switch control circuitINLWhen for low level state, if the fault diagnosis signal read VDIAGLLess than 1V, then to judge high-voltage relay lower edge switch, between high-voltage relay, there are shorted to earth failures;If read The fault diagnosis signal V takenDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;Otherwise, show High-voltage relay lower edge switch between high-voltage relay under lower edge switch off state it is working properly;
In the control signal V of lower edge switch control circuitINLWhen for high level state, if the fault diagnosis signal read VDIAGLGreater than 4.5V, then to judge that high-voltage relay lower edge switch exists between high-voltage relay to power supply short circuit failure;It is no Then, show high-voltage relay lower edge switch between high-voltage relay under lower edge switch on state it is working properly;
High-voltage relay lower edge switch between high-voltage relay under lower edge switch off state and on state under In the case where all working properly, then judge high-voltage relay lower edge switch to normal between high-voltage relay.
It include high side switches the invention has the following beneficial effects: power battery high-voltage relay control circuit of the invention Control circuit and lower edge switch control circuit, high-voltage relay are total by high side switches control circuit and lower edge switch control circuit With the conducting or shutdown of control high-voltage relay.High side switches control circuit and lower edge switch control diagnostic circuit of having, can To sentence according to the relational implementation high side switches and lower edge switch fault diagnosis of the voltage of fault diagnosis signal and diagnostic threshold voltage Break and distinguish open circuit, be shorted to ground, be shorted to power failure, fault diagnosis coverage rate reaches 99%.Hardware structure measurement and with Machine hardware failure rate index meets the security target of safety integrity level ASIL-C or ASIL-D.
Detailed description of the invention
Fig. 1 is the hardware structure schematic diagram of lower edge switch in the prior art;
Fig. 2 is the hardware structure schematic diagram of high side switches in the prior art;
Fig. 3 is electrical block diagram of the invention;
Fig. 4 is high side switches control circuit schematic diagram of the invention;
Fig. 5 is lower edge switch control circuit schematic diagram of the invention;
Fig. 6 is high side switches Troubleshooting Flowchart of the invention;
Fig. 7 is lower edge switch Troubleshooting Flowchart of the invention;
Specific embodiment
Technical solution of the present invention is further elaborated below with reference to examples and drawings.
Embodiment 1
Present embodiments provide a kind of power battery high-voltage relay control circuit comprising high side switches control circuit 1 With lower edge switch control circuit 2.
As shown in figure 3, an output port of the first end connection MCU3 of the high side switches control circuit 1, flash One end of the coil of the second end connection high-voltage relay 5 of ON-OFF control circuit 1, the third end of high side switches control circuit 1 connects Connect an A/D input port of MCU;An output port of the first end connection MCU of the lower edge switch control circuit 2, The other end of the coil of the second end connection high-voltage relay of lower edge switch control circuit 2, the third of lower edge switch control circuit 2 An A/D input port of end connection MCU, an output end of the 4th end connection security module 4 of lower edge switch control circuit 2 Mouthful.
As shown in figure 4, the high side switches control circuit (1) includes: intelligent power high side switches U1, diode D1, Resistance R1, R2, R3, R4 and RGND, capacitor C1 and CF
The control signal IN of the intelligent power high side switches U1 as the high side switches control circuit 1 first End inputs the control signal V of high side switches control circuit 1INH, connect an output port of MCU, power end VBATConnect 12V Battery positive voltage, ground terminal GND pass through resistance RGNDGround connection, output end OUT as the high side switches control circuit 1 second End connects one end of resistance R1;The other end of resistance R1 connects 12V battery positive voltage;The plus earth of diode D1, cathode connect Meet the output end OUT of intelligent power high side switches U1;
Described resistance R2, R3 and the R4, capacitor C1 form high side switches fault diagnosis circuit;The one of resistance R2, R3 and R4 End links together;The output end OUT of the other end connection intelligent power high side switches U1 of resistance R4;The other end of resistance R2 connects Meet digital power voltage VDD5;The other end of resistance R3 is grounded;Capacitor C1 is connected in parallel on the both ends of resistance R3;Resistance R2, resistance R3 Common end with resistance R4 is the output end of diagnostic signal as the third end of the high side switches control circuit 1 and exports flash The fault diagnosis signal V of ON-OFF control circuit 1DIAGH
Wherein, one group of embodiment parameter is resistance R1=47K Ω, R2=R3=R4=100k Ω, RGND=100 Ω, C1 =1nF, CF=100nF, the model BTS5090-1EJA of intelligent power high side switches U1, diode model SURA8220T3G。
As shown in figure 5, the lower edge switch control circuit 2 includes: intelligent power lower edge switch U2, triode Q1, electricity Hinder R5, R6, R7, R8, R9, R10 and R11 and capacitor C2;
The control signal IN of the intelligent power lower edge switch U2 as the lower edge switch control circuit 2 first End inputs the control signal V of lower edge switch control circuit 2INL, an output port of the MCU, ground are connected by resistance R8 Terminal S ground connection, second end of the output end D as the lower edge switch control circuit 2;One end connection intelligent power of resistance R9 is low The control signal IN of side switch U2, other end ground connection;The control of the collector connection intelligent power lower edge switch U2 of triode Q1 Input terminal IN processed, emitter ground connection;The base stage and emitter of resistance R11 connecting triode Q1;One end of resistance R10 connects three poles The base stage of pipe Q1, fourth end of the other end as the lower edge switch control circuit 2, connection electronic control unit security module One output port;
Described resistance R5, R6 and the R7, capacitor C6 form lower edge switch fault diagnosis circuit;Resistance R5, electricity R6 and R7 One end links together, the output end D of the other end connection intelligent power lower edge switch U2 of resistance R7;The other end of resistance R5 connects Meet digital power voltage VDD5;The other end of resistance R6 is grounded;Capacitor C2 is connected in parallel on the both ends of resistance R6;Resistance R5, resistance R6 Common end with resistance R7 is that the output end of diagnostic signal exports low side as the third end of the lower edge switch control circuit 2 The fault diagnosis signal V of ON-OFF control circuit 1DIAGL
Wherein, one group of embodiment parameter is resistance R5=R6=R7=100k Ω, R8=1.2k Ω, R9=47k Ω, C2 =1nF, the model BSP76 of intelligent power high side switches U1, triode model BC817.
The working condition of security module real-time monitoring MCU, when monitoring that MCU work occurs abnormal, security module output 2 enable signal VEN of lower edge switch control circuit, lower edge switch control circuit 2 is turned off, guarantees the functional safety of system.
The power battery high-voltage relay control circuit of the present embodiment is controlled by high side switches control circuit and lower edge switch Circuit composition, high-voltage relay pass through high side switches control circuit and lower edge switch control circuit co- controlling high-voltage relay Conducting or shutdown.High side switches control circuit and lower edge switch control diagnostic circuit of having, can be according to fault diagnosis signal Voltage and diagnostic threshold voltage relational implementation high side switches and lower edge switch fault diagnosis, judge and distinguish open circuit, short circuit To ground, it is shorted to power failure, fault diagnosis coverage rate reaches 99%.Hardware structure measurement and random hardware crash rate index are full The security target of sufficient safety integrity level ASIL-C or ASIL-D.
And high side switches control circuit and lower edge switch control circuit co- controlling high-voltage relay are used, it can be not required to Fuse and more harness are wanted, system architecture complexity is reduced.
Embodiment 2
A kind of method for diagnosing faults of power battery high-voltage relay control circuit is present embodiments provided, MCU is based on A/D input port feedback voltage level and diagnostic threshold voltage relationship, and combine high side switches, lower edge switch state realize Fault diagnosis, and the fault diagnosis of the fault diagnosis including high side switches control circuit and lower edge switch control circuit.
In the present embodiment, as shown in fig. 6, the fault diagnosis of the high side switches control circuit includes:
The fault diagnosis signal V of high side switches control circuit 1 is read in the every 10ms timing of the MCUDIAGH;It will be corresponding low Side ON-OFF control circuit is in the conductive state, and judges whether lower edge switch control circuit breaks down, if lower edge switch control Circuit malfunctions processed then terminate the fault diagnosis of high side switches control circuit;Otherwise high side switches control circuit is continued to execute Fault diagnosis.
As the control signal V of high side switches control circuit 1INHWhen for low level state (invalid), if the failure read is examined Break signal VDIAGHGreater than 4.5V, then to judge that high-voltage relay high side switches are former to power supply short circuit to existing between high-voltage relay Barrier;If the fault diagnosis signal V readDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;
Otherwise, show high-voltage relay high side switches to working just under high side switches off state between high-voltage relay Often.
In the control signal V of high side switches control circuit 1INHWhen for high level state (effective), if the failure read is examined Break signal VDIAGHLess than 1.5V, then to judge high-voltage relay high side switches, between high-voltage relay, there are shorted to earth events Barrier;
Otherwise, show high-voltage relay high side switches to working just under high side switches on state between high-voltage relay Often.
High-voltage relay high side switches between high-voltage relay under high side switches off state and on state under In the case where all working properly, then judge high-voltage relay high side switches to normal between high-voltage relay.
In the present embodiment, as shown in fig. 7, the fault diagnosis of the lower edge switch control circuit includes:
The fault diagnosis signal V of lower edge switch control circuit 2 is read in the every 10ms timing of the MCUDIAGL;By corresponding height Side ON-OFF control circuit is in the conductive state, and judges whether high side switches control circuit breaks down, if high side switches control Circuit malfunctions processed then terminate the fault diagnosis of lower edge switch control circuit.
As the control signal V of lower edge switch control circuit 2INLWhen for low level state (invalid), if the failure read is examined Break signal VDIAGLLess than 1V, then to judge high-voltage relay lower edge switch, between high-voltage relay, there are shorted to earth failures; If the fault diagnosis signal V readDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;It is no Then, show high-voltage relay lower edge switch between high-voltage relay under lower edge switch off state it is working properly.
In the control signal V of lower edge switch control circuit 2INLWhen for high level state (effective), if the failure read is examined Break signal VDIAGLGreater than 4.5V, then to judge that high-voltage relay lower edge switch is former to power supply short circuit to existing between high-voltage relay Barrier;Otherwise, show high-voltage relay lower edge switch between high-voltage relay under lower edge switch on state it is working properly.
High-voltage relay lower edge switch between high-voltage relay under lower edge switch off state and on state under In the case where all working properly, then judge high-voltage relay lower edge switch to normal between high-voltage relay.
The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features; And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (5)

1. a kind of power battery high-voltage relay control circuit, which is characterized in that including high side switches control circuit (1) and low side ON-OFF control circuit (2);
An output port of the first end connection MCU of the high side switches control circuit (1), high side switches control circuit (1) one end of the coil of second end connection high-voltage relay, the one of the third end connection MCU of high side switches control circuit (1) A A/D input port;
An output port of the first end connection MCU of the lower edge switch control circuit (2), lower edge switch control circuit (2) other end of the coil of second end connection high-voltage relay, the third end connection MCU's of lower edge switch control circuit (2) One A/D input port, an output port of the 4th end connection security module of lower edge switch control circuit (2).
2. power battery high-voltage relay control circuit according to claim 1, which is characterized in that the high side switches Control circuit (1) includes: intelligent power high side switches U1, diode D1, resistance R1, resistance R2, resistance R3, resistance R4, resistance RGND, capacitor C1 and capacitor CF
The control signal IN of the intelligent power high side switches U1 as the high side switches control circuit (1) first End inputs the control signal V of high side switches control circuit (1)INH, and connect an output port of MCU;
The power end V of the intelligent power high side switches U1BATConnect 12V battery positive voltage;The intelligent power flash is opened The ground terminal GND for closing U1 passes through resistance RGNDGround connection;The output end OUT of the intelligent power high side switches U1 is as the height The second end of side ON-OFF control circuit (1) connects one end of resistance R1;The other end of resistance R1 connects 12V battery positive voltage;Institute State the plus earth of diode D1, the output end OUT of the cathode connection intelligent power high side switches U1 of the diode D1;
One end of resistance R2, the resistance R3 and resistance R4 link together;The other end connection intelligent power of resistance R4 is high The output end OUT of side switch U1;The other end of resistance R2 connects digital supply voltage VDD5;The other end of resistance R3 is grounded;Electricity Hold the both ends that C1 is connected in parallel on resistance R3;The common end of resistance R2, resistance R3 and resistance R4 are the output end of diagnostic signal, as institute The third end of high side switches control circuit (1) is stated, the fault diagnosis signal V of high side switches control circuit (1) is exportedDIAGH
3. power battery high-voltage relay control circuit according to claim 1 or 2, which is characterized in that the low side ON-OFF control circuit (2) include: intelligent power lower edge switch U2, triode Q1, resistance R5, resistance R6, resistance R7, resistance R8, Resistance R9, resistance R10, resistance R11 and capacitor C2;
The control signal IN of the intelligent power lower edge switch U2 as the lower edge switch control circuit (2) first End inputs the control signal V of lower edge switch control circuit (2)INL, and connect by resistance R8 an output end of the MCU Mouthful;
The ground terminal S of the intelligent power lower edge switch U2 is grounded, and the output end D of the intelligent power lower edge switch U2 makees For the second end of the lower edge switch control circuit (2);The control of one end connection intelligent power lower edge switch U2 of resistance R9 is defeated Enter and holds IN, other end ground connection;The control signal IN of the collector connection intelligent power lower edge switch U2 of triode Q1, triode The emitter of Q1 is grounded;The base stage and emitter of resistance R11 connecting triode Q1;One end connecting triode Q1's of resistance R10 Base stage, fourth end of the resistance R10 other end as the lower edge switch control circuit (2) connect the safe mould of electronic control unit One output port of block;
One end of resistance R5, the resistance R6 and resistance R7 link together, and the other end connection intelligent power of resistance R7 is low The output end D of side switch U2;The other end of resistance R5 connects digital supply voltage VDD5;The other end of resistance R6 is grounded;Capacitor C2 is connected in parallel on the both ends of resistance R6;The common end of resistance R5, resistance R6 and resistance R7 are the output end of diagnostic signal, as described The third end of lower edge switch control circuit (2) exports the fault diagnosis signal V of lower edge switch control circuit (1)DIAGL
4. power battery high-voltage relay control circuit according to claim 3, which is characterized in that security module is supervised in real time The working condition for surveying MCU, when monitoring that MCU work occurs abnormal, it is enabled that security module exports lower edge switch control circuit (2) Signal VEN turns off lower edge switch control circuit (2).
5. a kind of method for diagnosing faults of power battery high-voltage relay control circuit, which is characterized in that including high side switches control The fault diagnosis of circuit processed and the fault diagnosis of lower edge switch control circuit;
Wherein, the fault diagnosis of the high side switches control circuit includes:
The fault diagnosis signal V of high side switches control circuit (1) is read in MCU timingDIAGH;By corresponding lower edge switch control circuit (2) in the conductive state, and judge whether lower edge switch control circuit (2) breaks down, if lower edge switch control circuit (2) It breaks down, then terminates the fault diagnosis of high side switches control circuit (1);
As the control signal V of high side switches control circuit (1)INHWhen for low level state, if the fault diagnosis signal read VDIAGHGreater than 4.5V, then to judge that high-voltage relay high side switches exist between high-voltage relay to power supply short circuit failure;Such as The fault diagnosis signal V that fruit is readDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;Otherwise, Show high-voltage relay high side switches between high-voltage relay under high side switches off state it is working properly;
In the control signal V of high side switches control circuit (1)INHWhen for high level state, if the fault diagnosis signal read VDIAGHLess than 1.5V, then to judge high-voltage relay high side switches, between high-voltage relay, there are shorted to earth failures;Otherwise, Show high-voltage relay high side switches between high-voltage relay under high side switches on state it is working properly;
In high-voltage relay high side switches between high-voltage relay, all work under high side switches off state and under on state Make in normal situation, then judges high-voltage relay high side switches to normal between high-voltage relay;
The fault diagnosis of the lower edge switch control circuit includes:
The fault diagnosis signal V of lower edge switch control circuit (2) is read in the MCU timingDIAGL;By corresponding high side switches control Circuit processed is in the conductive state, and judges whether high side switches control circuit breaks down, if high side switches control circuit is sent out Raw failure, then terminate the fault diagnosis of lower edge switch control circuit;
As the control signal V of lower edge switch control circuit (2)INLWhen for low level state, if the fault diagnosis signal read VDIAGLLess than 1V, then to judge high-voltage relay lower edge switch, between high-voltage relay, there are shorted to earth failures;If read The fault diagnosis signal V takenDIAGHFor 2~3V, then judge that there are open-circuit faults in high-voltage relay driver circuit;Otherwise, show High-voltage relay lower edge switch between high-voltage relay under lower edge switch off state it is working properly;
In the control signal V of lower edge switch control circuit (2)INLWhen for high level state, if the fault diagnosis signal read VDIAGLGreater than 4.5V, then to judge that high-voltage relay lower edge switch exists between high-voltage relay to power supply short circuit failure;It is no Then, show high-voltage relay lower edge switch between high-voltage relay under lower edge switch on state it is working properly;
In high-voltage relay lower edge switch to all work under lower edge switch off state and under on state between high-voltage relay Make in normal situation, then judges high-voltage relay lower edge switch to normal between high-voltage relay.
CN201910008507.4A 2019-01-04 2019-01-04 Power battery high-voltage relay control circuit and method for diagnosing faults Pending CN109541457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910008507.4A CN109541457A (en) 2019-01-04 2019-01-04 Power battery high-voltage relay control circuit and method for diagnosing faults

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910008507.4A CN109541457A (en) 2019-01-04 2019-01-04 Power battery high-voltage relay control circuit and method for diagnosing faults

Publications (1)

Publication Number Publication Date
CN109541457A true CN109541457A (en) 2019-03-29

Family

ID=65834289

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910008507.4A Pending CN109541457A (en) 2019-01-04 2019-01-04 Power battery high-voltage relay control circuit and method for diagnosing faults

Country Status (1)

Country Link
CN (1) CN109541457A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111766503A (en) * 2019-04-01 2020-10-13 宁德时代新能源科技股份有限公司 Drive failure diagnosis circuit
WO2021036958A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric car
WO2021036959A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric car
WO2021036960A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111766503A (en) * 2019-04-01 2020-10-13 宁德时代新能源科技股份有限公司 Drive failure diagnosis circuit
WO2021036958A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric car
WO2021036959A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric car
WO2021036960A1 (en) * 2019-08-30 2021-03-04 宁德时代新能源科技股份有限公司 Detection circuit and detection method for electric control device, and electric vehicle

Similar Documents

Publication Publication Date Title
CN109541457A (en) Power battery high-voltage relay control circuit and method for diagnosing faults
CN105313700B (en) The high voltage interlock circuit and method for diagnosing faults of a kind of new-energy automobile
CN106740125B (en) A kind of high tension apparatus fault detection system, method and the electric car of electric car
CN102866353A (en) Device and method for state detection of main loop relay of direct-current power supply system
CN104842798B (en) The control method and system of electrokinetic cell relay disconnection process
CN106154145A (en) A kind of fault test set being applied to high-tension battery contactor and fault detection method
CN205116997U (en) Passenger car lock control unit
CN105291875A (en) Electromobile quick charge method
CN106291198A (en) A kind of charging pile simulator
CN107310395A (en) The diagnostic circuit and method of a kind of loop interlocking
CN108437799A (en) A kind of interlocking diagnostic system of loop
CN204462334U (en) A kind of fault test set being applied to high-tension battery contactor
CN204696641U (en) A kind of equipment for the protection of high-tension battery using electricity system and the vehicle with this equipment
CN109888864A (en) Battery management system
CN110103855A (en) A kind of distribution system and method for mixed motor-car
CN202916408U (en) Main loop relay state detecting device of direct current power supply system
CN109532496A (en) A kind of intelligent high-pressure block terminal based on CAN bus network
CN105425773A (en) Relay output channel diagnosis device and method for control system
CN108254682A (en) The method of discrimination of direct-current charging post output contactor adhesion fault
CN106300229B (en) It is a kind of for protecting the device and method of high-tension battery electricity system
CN102320271A (en) A kind of pure electric automobile is used control capsule
CN209690463U (en) Power battery high-voltage relay control circuit
CN109324596A (en) A kind of electric machine controller high-voltage interlocking detection circuit and detection method
CN105751904A (en) Connection device for power battery and super-capacitor of electric vehicle
CN203519737U (en) Electric vehicle test system possessing scram and insulation protection functions

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination