CN103454543A - Method for diagnosing faults of bidirectional DC-DC converter - Google Patents
Method for diagnosing faults of bidirectional DC-DC converter Download PDFInfo
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- CN103454543A CN103454543A CN2013104403219A CN201310440321A CN103454543A CN 103454543 A CN103454543 A CN 103454543A CN 2013104403219 A CN2013104403219 A CN 2013104403219A CN 201310440321 A CN201310440321 A CN 201310440321A CN 103454543 A CN103454543 A CN 103454543A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 title abstract 5
- 238000003745 diagnosis Methods 0.000 claims abstract description 47
- 230000002159 abnormal effect Effects 0.000 claims abstract description 30
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000002405 diagnostic procedure Methods 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 4
- 238000013024 troubleshooting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The invention discloses a method for diagnosing faults of a bidirectional DC-DC converter applied to a new energy automobile power system. The method comprises recoverable software fault diagnosis, hardware recoverable fault diagnosis, software unrecoverable fault diagnosis and hardware unrecoverable fault diagnosis, wherein abnormal conditions are diagnosed through the recoverable software fault diagnosis and the hardware recoverable fault diagnosis, the faults are reported, and after the abnormal conditions disappear, the faults are removed; abnormal conditions are diagnosed through the software unrecoverable fault diagnosis and the hardware unrecoverable fault diagnosis, the faults are reported, and after the abnormal conditions disappear, the faults are not removed immediately. The bidirectional DC-DC converter monitors the states of the current, the voltage, the temperature, the CAN information and the IGBT power tube of the bidirectional DC-DC converter in real time, the corresponding faults are reported once the abnormal conditions occur, the working reliability of the bidirectional DC-DC converter can be guaranteed, and therefore the reliability of the power system is improved.
Description
Technical field
The present invention relates to a kind of new-energy automobile technical field, be specifically related to the method for diagnosing faults of the bi-directional DC-DC converter in new-energy automobile.
Background technology
Bi-directional DC-DC converter is the important component part of new-energy automobile power system, it can be in the situation that the input voltage fluctuation regulated output voltage, due to the forward voltage that boosted lifting, can reduce the loss of electric machine, can realize that by reverse step-down energy reclaims during the car load braking.For ensureing the reliability of bi-directional DC-DC converter work, it is particularly important that fault diagnosis just seems.Traditional DC-DC converter rarely has the design that embeds fault diagnosis, even designed fault diagnosis, its diagnosis mechanism is also too simple, and the possibility of fault misdescription is very large, and its functional reliability can not get powerful guarantee.
Summary of the invention
The present invention proposes a kind of method for diagnosing faults that is applied to the bi-directional DC-DC converter of new-energy automobile power system, comprise that software can recover fault diagnosis, hardware can recover fault diagnosis, the diagnosis of software unrecoverable failure and the diagnosis of hardware unrecoverable failure, wherein software can recover fault diagnosis and goes out abnormal conditions by software diagnosis, the report fault, after abnormal conditions disappear, remove fault; Hardware can recover fault diagnosis and detect abnormal conditions by special hardware detecting circuit, send failure message to the corresponding I/O port of Master control chip, after abnormal conditions disappear, hardware detecting circuit sends non-fault information to the corresponding I/O port of Master control chip, whether Master control chip, by the state of this I/O port of inquiry, just can be learnt and have fault to occur; The diagnosis of software unrecoverable failure goes out abnormal conditions by software diagnosis, the report fault, and abnormal conditions are not removed fault after disappearing thereupon; After the diagnosis of hardware unrecoverable failure detects abnormal conditions by special hardware detecting circuit, send failure message to the corresponding I/O port of Master control chip, after abnormal conditions disappear, do not change the level state of I/O port, Master control chip is by the state failure judgement situation of this I/O port of inquiry.
Further, also comprise that software and hardware can recover the fault recovery of fault, this fault recovery is called once at regular intervals by the fault diagnosis main flow, and the value that at every turn each can be recovered to the failure counter of fault subtracts 1, until be kept to 0, removes fault.
Wherein, software can recover fault and comprises inductance instantaneous overcurrent fault, output terminal instantaneous overcurrent fault, input end instantaneous overvoltage fault, output terminal instantaneous overvoltage fault and upper and lower brachium pontis power tube excess temperature fault; The state of the real-time monitor current of bi-directional DC-DC converter, voltage and temperature, when electric current, voltage or temperature being detected over the maximum current allowed, voltage or temperature limit, just its corresponding failure counter is added to counting, when count value surpasses the setting count limit, the count limit assignment to counter, and by its corresponding abort situation position.
Wherein, hardware can recover fault and comprises output terminal instantaneous overcurrent hardware fault, inductance instantaneous overcurrent hardware fault, input end instantaneous overvoltage hardware fault, output terminal instantaneous overvoltage hardware fault, upper brachium pontis power tube excess temperature hardware fault, lower brachium pontis power tube excess temperature hardware fault; The control panel of described bi-directional DC-DC converter is provided with special level comparison circuit, magnitude of voltage and setting value that electric current, voltage and temperature collection circuit are collected compare, if surpass setting value, the comparator circuit output low level is given the I/O port of corresponding Master control chip; If do not surpass setting value, comparator circuit is exported high level, each I/O port status of Master control chip periodic queries, and it is low a certain I/O port status being detected, give this failure counter the limit value indirect assignment of corresponding failure counter, and quote corresponding fault.
Wherein, the software unrecoverable failure comprises inductance over current fault, output terminal over current fault, input end overvoltage fault and output terminal overvoltage fault, after diagnosis has overcurrent, the instantaneous software fault of overvoltage, the corresponding counter of each unrecoverable failure starts counting, when each unrecoverable failure count value reaches the restriction set, report corresponding unrecoverable failure.
Wherein, the hardware unrecoverable failure comprises that upper and lower brachium pontis power tube temperature sensor fault and IGBT door drive saturated fault.
Wherein, the output valve of a certain temperature sensor of upper and lower brachium pontis power tube of described bi-directional DC-DC converter is after Master control chip AD port translation, when its value is outside a setting range, report corresponding power tube temperature sensor fault, this fault is once quoting, just can not after recovering, only restarting Master control chip, can remove this fault.
Wherein, when the driving chip of described bi-directional DC-DC converter breaks down, output low level drives saturated indicating fault I/O port to Master control chip IGBT door; If drive chip operation normal, export high level to this I/O port.This I/O port status of Master control chip periodic queries, be low if the I/O port status detected, reports the IGBT door to drive saturated fault, and this fault is once quoting, just can not be from recovering, only restart after driving chip and can remove this fault.
Further, to overcurrent, fault diagnosis flow scheme that overvoltage is relevant, by the every 50 μ s of master routine, called once; The fault diagnosis flow scheme relevant to excess temperature called once by the every 10ms of main flow.
Further, also comprise CAN information drop-out fault diagnosis, software can recover in fault diagnosis, first judged whether that CAN bus outage occurs, if not, judge whether to surpass a setting-up time and do not receive the message on the CAN bus, if, CAN information drop-out failure counter is added 2 countings, whether the value that judges counter is more than or equal to a setting value, if, this setting value assignment to counter, and report CAN information drop-out fault, described CAN information drop-out fault diagnosis is called once at regular intervals by the fault diagnosis main flow.
Further, also comprise CAN bus outage diagnosis, described bi-directional DC-DC converter Master control chip is with the CAN module, in hardware can recover fault diagnosis, and when the CAN module during in the bus interruption status, its position, BO position; During normal condition, the zero clearing of BO position, Master control chip reads the state of BO position in real time, during position, BO position, the value of CAN bus outage counter adds 2, judges whether the value of CAN bus outage counter is more than or equal to a setting value, if, this setting value assignment to CAN bus outage counter, and report CAN bus outage.
Bi-directional DC-DC converter of the present invention is monitored the state of its electric current, voltage, temperature, CAN message, IGBT power tube in real time, once the abnormal situation is just reported corresponding fault, can ensure the reliability of bi-directional DC-DC converter work, thereby improve the reliability of power system.
The accompanying drawing explanation
Fig. 1: software can recover Troubleshooting Flowchart;
Fig. 2: CAN information drop-out Troubleshooting Flowchart;
Fig. 3: hardware can recover Troubleshooting Flowchart;
Fig. 4: CAN bus outage diagnostic flow chart;
Fig. 5: software and hardware can recover the fault clearance process flow diagram;
Fig. 6: software unrecoverable failure diagnostic flow chart;
Fig. 7: temperature sensor Troubleshooting Flowchart;
Fig. 8: IGBT door driving malfunction diagnostic flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described.
Bi-directional DC-DC converter method for diagnosing faults of the present invention is divided into fault that software can recover fault, hardware can recover fault, software unrecoverable failure and hardware unrecoverable failure four classes.
Wherein software can recover fault and refers to by software diagnosis and go out abnormal conditions that the report fault, after abnormal conditions disappear, is removed the such class fault of fault.Hardware can recover fault and refer to that special hardware detecting circuit detects abnormal conditions, send failure message (as low level signal) to the corresponding I/O port of Master control chip, after abnormal conditions disappear, hardware detecting circuit sends non-fault information (as high level signal) to the corresponding I/O port of Master control chip, whether Master control chip, by the state of this I/O port of inquiry, just can be learnt and have fault to occur.The software unrecoverable failure refers to by software diagnosis and goes out abnormal conditions, report fault, the class fault that abnormal conditions are not removed after disappearing thereupon.After the hardware unrecoverable failure refers to that special hardware detecting circuit detects abnormal conditions, send failure message (as low level signal) to the corresponding I/O port of Master control chip, after abnormal conditions disappear, do not change the level state of I/O port, Master control chip is by the state failure judgement situation of this I/O port of inquiry.
1, software can recover method for diagnosing faults.
As shown in Figure 1, for described bi-directional DC-DC converter software can recover the diagnostic method of fault, be applicable to the diagnosis of inductance instantaneous overcurrent fault, output terminal instantaneous overcurrent fault, input end instantaneous overvoltage fault, output terminal instantaneous overvoltage fault and upper and lower brachium pontis power tube excess temperature fault.The state of the real-time monitor current of described bi-directional DC-DC converter, voltage and temperature, when electric current, voltage or temperature being detected over the maximum current allowed, voltage or temperature limit, just its corresponding failure counter is added to counting, when count value surpasses the setting count limit, the count limit assignment to counter, and by its corresponding abort situation position.
In the present invention, the diagnostic routine of instantaneous overcurrent, overvoltage software fault is called once by the every 50 μ s of master routine.The limit value of output current and inductive current all is made as 100A, and the limit value of two current failure counters all is made as 40, and counter adds 1 counting at every turn.If output current or inductive current continue to surpass are set limit value, so from detect for the first time over-current phenomenon avoidance to time of report fault be 2ms.The limit value of input voltage is made as 210V, and the limit value of output voltage is made as 420V, and the limit value of two voltage failure counters all is made as 5, and counter adds 5 countings at every turn.Continue to surpass set limit value if input or output voltage, so from detect for the first time the overvoltage phenomenon to time of report fault be 50 μ s.
In the present invention, excess temperature software fault diagnosis program is called once by the every 10ms of master routine.Upper and lower brachium pontis power tube temperature limit is made as 90 ℃, and the limit value of two temperature fault counters all is made as 400, and counter adds 10 countings at every turn.If upper brachium pontis or lower brachium pontis power tube temperature continue to surpass are set limit value, so from detect for the first time the excess temperature phenomenon to time of report fault be 400ms.
As shown in Figure 2, can recover CAN information drop-out method for diagnosing faults in fault for described bi-directional DC-DC converter software.First judged whether that CAN bus outage occurs, if not, judge whether to surpass 10ms and do not receive the message on the CAN bus, if, CAN information drop-out failure counter is added 2 countings, judges whether the value of counter is more than or equal to 50, if, 50 assignment to counter, and report CAN information drop-out fault.This diagnostic subroutine is called once by the every 10ms of master routine, from confirm not receive CAN message (surpass 10ms and do not receive that message the CAN bus is for confirming not receive CAN message) to the time of reporting this fault be 250ms.
2, hardware can recover method for diagnosing faults.
As shown in Figure 3, for described bi-directional DC-DC converter hardware can recover the diagnostic method of fault, be applicable to output terminal instantaneous overcurrent hardware fault, inductance instantaneous overcurrent hardware fault, input end instantaneous overvoltage hardware fault, output terminal instantaneous overvoltage hardware fault, upper brachium pontis power tube excess temperature hardware fault, lower brachium pontis power tube excess temperature hardware fault.The control panel of described bi-directional DC-DC converter is provided with special level comparison circuit, the magnitude of voltage that electric current, voltage and temperature collection circuit are collected compares with setting value (maximum current of corresponding permission, voltage and temperature value), if surpass setting value, the comparator circuit output low level is given the I/O port of corresponding Master control chip; If not, comparator circuit is exported high level.Each I/O port status of Master control chip periodic queries, it is low a certain I/O port status being detected, gives this failure counter the limit value indirect assignment of corresponding failure counter, and quotes corresponding fault.
In the present invention, the diagnostic routine of instantaneous overcurrent, overvoltage hardware fault is called once by the every 50 μ s of master routine.The limit value of output current and inductive current all is made as 100A, and the limit value of two current failure counters all is made as 40.If continuing to surpass, output current or inductive current set limit value, so from the times 50 μ s of over-current phenomenon avoidance to the report fault being detected for the first time.The limit value of input voltage is made as 210V, and the limit value of output voltage is made as 420V, and the limit value of two voltage failure counters all is made as 40.Continue to surpass set limit value if input or output voltage, so from detect for the first time the overvoltage phenomenon to time of report fault be 50 μ s.
In the present invention, excess temperature hardware fault diagnosis program is called once by the every 10ms of master routine.Upper and lower brachium pontis power tube temperature limit is made as 90 ℃, and the limit value of two temperature fault counters all is made as 40.If upper brachium pontis or lower brachium pontis power tube temperature continue to surpass are set limit value, so from detect for the first time the excess temperature phenomenon to time of report fault be 10ms.
As shown in Figure 4, can recover CAN bus outage diagnostic method in fault for described bi-directional DC-DC converter hardware.Described bi-directional DC-DC converter Master control chip is with the CAN module, when the CAN module during in the bus interruption status, and its position, BO position; During normal condition, the zero clearing of BO position.Master control chip reads the state of BO position in real time, and during position, BO position, the value of CAN bus outage counter adds 2, whether the value that judges CAN bus outage counter is more than or equal to 10, if, 10 assignment to CAN bus outage counter, and report CAN bus outage.This diagnosis sub-process is called once by the every 10ms of main flow, if having no progeny in the CAN bus, recovers always, and the time of interrupting starting to this fault of report from generation CAN bus is 50ms.
3, software and hardware can recover the fault recovery flow process of fault.
As shown in Figure 5, can recover the fault recovery flow process of fault for described bi-directional DC-DC converter software and hardware.Be applicable to that software can recover fault diagnosis and hardware can recover all faults of recovering in fault diagnosis.This sub-process is called once by the every 10ms of main flow, and the value that at every turn each can be recovered to the failure counter of fault subtracts 1, until be kept to 0, removes this fault.
4, software unrecoverable failure diagnostic method.
As shown in Figure 6, described bi-directional DC-DC converter software unrecoverable failure diagnostic method is applicable to inductance over current fault, output terminal over current fault, input end overvoltage fault and output terminal overvoltage fault.After diagnosis has overcurrent, the instantaneous software fault of overvoltage, the corresponding counter of each unrecoverable failure starts counting, when each unrecoverable failure count value reaches the restriction set, reports corresponding unrecoverable failure.This type of fault, once quoting, can not can be recovered after recovering, only having program to restart.
5, hardware unrecoverable failure diagnostic method
Bi-directional DC-DC converter hardware unrecoverable failure comprises that upper and lower brachium pontis power tube temperature sensor fault and IGBT door drive saturated fault.
As shown in Figure 7, upper and lower brachium pontis power tube temperature sensor method for diagnosing faults is as follows: the output valve of a certain temperature sensor of upper and lower brachium pontis power tube of described bi-directional DC-DC converter is after Master control chip AD port translation, its value is less than 100, perhaps be greater than 4000, report corresponding power tube temperature sensor fault, this fault, once quoting, just can not can be removed this fault after recovering, only restarting Master control chip.
As shown in Figure 8, the IGBT door drives saturated method for diagnosing faults as follows: when the driving chip of described bi-directional DC-DC converter breaks down, output low level drives saturated indicating fault I/O port to Master control chip IGBT door; If drive chip operation normal, export high level to this I/O port.This I/O port status of Master control chip periodic queries, be low if the I/O port status detected, reports the IGBT door to drive saturated fault, and this fault is once quoting, just can not be from recovering, only restart after driving chip and can remove this fault.
Claims (9)
1. a bi-directional DC-DC converter method for diagnosing faults, it is characterized in that: comprise that software can recover fault diagnosis, hardware can recover fault diagnosis, the diagnosis of software unrecoverable failure and the diagnosis of hardware unrecoverable failure, wherein software can recover fault diagnosis and goes out abnormal conditions by software diagnosis, the report fault, after abnormal conditions disappear, remove fault; Hardware can recover fault diagnosis and detect abnormal conditions by special hardware detecting circuit, send failure message to the corresponding I/O port of Master control chip, after abnormal conditions disappear, hardware detecting circuit sends non-fault information to the corresponding I/O port of Master control chip, whether Master control chip, by the state of this I/O port of inquiry, just can be learnt and have fault to occur; The diagnosis of software unrecoverable failure goes out abnormal conditions by software diagnosis, the report fault, and abnormal conditions are not removed fault after disappearing thereupon; After the diagnosis of hardware unrecoverable failure detects abnormal conditions by special hardware detecting circuit, send failure message to the corresponding I/O port of Master control chip, after abnormal conditions disappear, do not change the level state of I/O port, Master control chip is by the state failure judgement situation of this I/O port of inquiry.
2. method for diagnosing faults according to claim 1, it is characterized in that: also comprise that software and hardware can recover the fault recovery of fault, this fault recovery is called once at regular intervals by the fault diagnosis main flow, each value that each can be recovered to the failure counter of fault subtracts 1, until be kept to 0, remove fault.
3. method for diagnosing faults according to claim 1 and 2, it is characterized in that: software can recover fault and comprise inductance instantaneous overcurrent fault, output terminal instantaneous overcurrent fault, input end instantaneous overvoltage fault, output terminal instantaneous overvoltage fault and upper and lower brachium pontis power tube excess temperature fault; The state of the real-time monitor current of bi-directional DC-DC converter, voltage and temperature, when electric current, voltage or temperature being detected over the maximum current allowed, voltage or temperature limit, just its corresponding failure counter is added to counting, when count value surpasses the setting count limit, the count limit assignment to counter, and by its corresponding abort situation position.
4. according to the described method for diagnosing faults of claim 1-3 any one, it is characterized in that: hardware can recover fault and comprise output terminal instantaneous overcurrent hardware fault, inductance instantaneous overcurrent hardware fault, input end instantaneous overvoltage hardware fault, output terminal instantaneous overvoltage hardware fault, upper brachium pontis power tube excess temperature hardware fault, lower brachium pontis power tube excess temperature hardware fault; The control panel of described bi-directional DC-DC converter is provided with special level comparison circuit, magnitude of voltage and setting value that electric current, voltage and temperature collection circuit are collected compare, if surpass setting value, the comparator circuit output low level is given the I/O port of corresponding Master control chip; If do not surpass setting value, comparator circuit is exported high level, each I/O port status of Master control chip periodic queries, and it is low a certain I/O port status being detected, give this failure counter the limit value indirect assignment of corresponding failure counter, and quote corresponding fault.
5. according to the described method for diagnosing faults of claim 1-4 any one, it is characterized in that: the software unrecoverable failure comprises inductance over current fault, output terminal over current fault, input end overvoltage fault and output terminal overvoltage fault, after diagnosis has overcurrent, the instantaneous software fault of overvoltage, the corresponding counter of each unrecoverable failure starts counting, when each unrecoverable failure count value reaches the restriction set, report corresponding unrecoverable failure.
6. according to the described method for diagnosing faults of claim 1-5 any one, it is characterized in that: the hardware unrecoverable failure comprises that upper and lower brachium pontis power tube temperature sensor fault and IGBT door drive saturated fault.
7. method for diagnosing faults according to claim 6, it is characterized in that: the output valve of a certain temperature sensor of upper and lower brachium pontis power tube of described bi-directional DC-DC converter is after Master control chip AD port translation, when its value is outside a setting range, report corresponding power tube temperature sensor fault, this fault is once quoting, just can not after recovering, only restarting Master control chip, can remove this fault.
8. method for diagnosing faults according to claim 6, it is characterized in that: when the driving chip of described bi-directional DC-DC converter breaks down, output low level drives saturated indicating fault I/O port to Master control chip IGBT door; If drive chip operation normal, export high level to this I/O port; This I/O port status of Master control chip periodic queries, be low if the I/O port status detected, reports the IGBT door to drive saturated fault, and this fault is once quoting, just can not be from recovering, only restart after driving chip and can remove this fault.
9. according to the described method for diagnosing faults of claim 1-8 any one, it is characterized in that: to overcurrent, fault diagnosis flow scheme that overvoltage is relevant, by the every 50 μ s of master routine, called once; The fault diagnosis flow scheme relevant to excess temperature called once by the every 10ms of main flow.
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| CN106019168A (en) * | 2016-05-10 | 2016-10-12 | 清华大学 | Testing system for DC-DC converter of fuel cell vehicle |
| CN109143109A (en) * | 2017-06-26 | 2019-01-04 | 蔚来汽车有限公司 | Electric vehicle inverter fault detection and processing method, device and storage medium |
| CN109703570A (en) * | 2017-10-25 | 2019-05-03 | 上海汽车集团股份有限公司 | A kind of fault handling method and device of electric machine control system |
| CN112115663A (en) * | 2020-09-23 | 2020-12-22 | 哈尔滨工业大学 | Feature extraction method for early multi-source fault diagnosis of DC-DC converter |
| CN112255542A (en) * | 2020-09-30 | 2021-01-22 | 潍柴动力股份有限公司 | Fault diagnosis method and device for PWM (pulse-width modulation) driving load and driving system |
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| CN112255542A (en) * | 2020-09-30 | 2021-01-22 | 潍柴动力股份有限公司 | Fault diagnosis method and device for PWM (pulse-width modulation) driving load and driving system |
| CN114384446A (en) * | 2021-12-28 | 2022-04-22 | 联合汽车电子有限公司 | Hardware fault diagnosis method and device for DCDC conversion module and storage medium |
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