CN103454543B - A kind of method for diagnosing faults of bi-directional DC-DC converter - Google Patents
A kind of method for diagnosing faults of bi-directional DC-DC converter Download PDFInfo
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- CN103454543B CN103454543B CN201310440321.9A CN201310440321A CN103454543B CN 103454543 B CN103454543 B CN 103454543B CN 201310440321 A CN201310440321 A CN 201310440321A CN 103454543 B CN103454543 B CN 103454543B
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims description 13
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000002405 diagnostic procedure Methods 0.000 description 7
- 230000001939 inductive effect Effects 0.000 description 4
- 238000013024 troubleshooting Methods 0.000 description 3
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Abstract
The invention discloses a kind of method for diagnosing faults being 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 and hardware can recover fault diagnosis and diagnoses out abnormal conditions, reported failures, after abnormal conditions disappear, remove fault; The diagnosis of software and hardware unrecoverable failure diagnoses out abnormal conditions, reported failures, and abnormal conditions do not remove fault after disappearing thereupon.Bi-directional DC-DC converter of the present invention monitors the state of its electric current, voltage, temperature, CAN message, IGBT power tube in real time, once there is unusual condition just report corresponding fault, the reliability of bi-directional DC-DC converter work can be ensured, thus improve the reliability of power system.
Description
Technical field
The present invention relates to a kind of technical field of new energy, 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 when input voltage fluctuation regulated output voltage, due to forward boosting lifting voltage, can the loss of electric machine be reduced, during car load braking, can energy regenerating be realized by reverse step-down.For ensureing the reliability of bi-directional DC-DC converter work, fault diagnosis just seems particularly important.Traditional dc-dc rarely has the design embedding fault diagnosis, even if devise 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 being 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, reported failures, 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, reported failures, and abnormal conditions do not remove 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 condition adjudgement failure condition of this I/O port of inquiry.
Further, also comprise the fault recovery that software and hardware can recover fault, this fault recovery is called once at regular intervals by fault diagnosis main flow, the value of the failure counter that respectively can recover fault is subtracted 1 at every turn, 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 detecting that electric current, voltage or temperature exceed the maximum current of permission, voltage or temperature limit, just counting is added to its corresponding failure counter, when count value exceedes setting count limit, 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, the magnitude of voltage collect electric current, voltage and temperature collection circuit and setting value compare, if exceed setting value, comparator circuit output low level gives the I/O port of corresponding Master control chip; If do not exceed setting value, comparator circuit then exports high level, each I/O port status of Master control chip periodic queries, detects that a certain I/O port status is low, then give this failure counter the limit value indirect assignment of corresponding failure counter, and quote corresponding fault.
Wherein, 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 set restriction, report corresponding unrecoverable failure.
Wherein, hardware unrecoverable failure comprises upper and lower brachium pontis power tube temperature sensor fault and IGBT door drives 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, then report corresponding power tube temperature sensor fault, this fault is once quoting, just not self recovery, can remove this fault after only restarting Master control chip.
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 driving chip is working properly, then export high level to this I/O port.This I/O port status of Master control chip periodic queries, if detect, I/O port status is low, then report IGBT door to drive saturated fault, and this fault is once quoting, and just not self recovery, can remove this fault after only restarting driving chip.
Further, call once to overcurrent, fault diagnosis flow scheme that overvoltage is relevant by the every 50 μ s of master routine; The fault diagnosis flow scheme relevant to excess temperature is called once by the every 10ms of main flow.
Further, also comprise CAN message and lose fault diagnosis, software can recover in fault diagnosis, first judge whether that CAN outage occurs, if not, then judge whether the message do not received more than a setting-up time in CAN, if, then CAN message loss failure counter carries out adding 2 countings, judge whether the value of counter is more than or equal to a setting value, if so, then this setting value assignment to counter, and report CAN message to lose fault, described CAN message is lost fault diagnosis and is called at regular intervals once by fault diagnosis main flow.
Further, also comprise the diagnosis of CAN outage, described bi-directional DC-DC converter Master control chip, with CAN module, can recover in fault diagnosis at hardware, when CAN module is in bus interruption status, and its position, BO position; During normal condition, BO position resets, Master control chip reads the state of BO position in real time, during position, BO position, the value of CAN outage counter adds 2, judges whether the value of CAN outage counter is more than or equal to a setting value, if, then this setting value assignment to CAN outage counter, and report CAN outage.
Bi-directional DC-DC converter of the present invention monitors the state of its electric current, voltage, temperature, CAN message, IGBT power tube in real time, once there is unusual condition just report corresponding fault, the reliability of bi-directional DC-DC converter work can be ensured, thus improve the reliability of power system.
Accompanying drawing explanation
Fig. 1: software can recover Troubleshooting Flowchart;
Fig. 2: CAN message loses Troubleshooting Flowchart;
Fig. 3: hardware can recover Troubleshooting Flowchart;
Fig. 4: CAN outage diagnostic flow chart;
Fig. 5: software and hardware can recover fault clearance process flow diagram;
Fig. 6: software unrecoverable failure diagnostic flow chart;
Fig. 7: temperature sensor fault diagnostic flow chart;
Fig. 8: IGBT door driving malfunction diagnostic flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described.
Fault is divided into that software can recover fault, hardware can recover fault by bi-directional DC-DC converter method for diagnosing faults of the present invention, software unrecoverable failure and hardware unrecoverable failure four class.
Wherein software can recover fault and refers to and go out abnormal conditions by software diagnosis, reported failures, after abnormal conditions disappear, removes the class fault that fault is such.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.Software unrecoverable failure refers to and goes out abnormal conditions by software diagnosis, reported failures, the class fault that abnormal conditions are not removed after disappearing thereupon.After 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 condition adjudgement failure condition 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 detecting that electric current, voltage or temperature exceed the maximum current of permission, voltage or temperature limit, just counting is added to its corresponding failure counter, when count value exceedes setting count limit, 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 is all set to 100A, and the limit value of two current fault counter is all set to 40, and counter adds 1 counting at every turn.If output current or inductive current are continued above setting limit value, so detect that over-current phenomenon avoidance is 2ms to the time of reported failures from first time.The limit value of input voltage is set to 210V, and the limit value of output voltage is set to 420V, and the limit value of two voltage fault count devices is all set to 5, and counter adds 5 countings at every turn.If input or output voltage keeps to exceed setting limit value, so detect that overvoltage phenomenon is 50 μ s to the time of reported failures from first time.
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 set to 90 DEG C, and the limit value of two temperature fault counters is all set to 400, and counter adds 10 countings at every turn.If upper brachium pontis or lower brachium pontis power tube constant temperature exceed setting limit value, so detect that excess temperature phenomenon is 400ms to the time of reported failures from first time.
As shown in Figure 2, method for diagnosing faults is lost for described bi-directional DC-DC converter software can recover CAN message in fault.First judge whether that CAN outage occurs, if not, then judge whether the message do not received more than 10ms in CAN, if, then CAN message loss failure counter carries out adding 2 countings, judges whether the value of counter is more than or equal to 50, if, then 50 assignment to counter, and report CAN message lose fault.This diagnostic subroutine calls once by the every 10ms of master routine, is 250ms from confirming not receive CAN message (message do not received CAN more than 10ms be confirm not receive CAN message) to the time of reporting this fault.
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, magnitude of voltage electric current, voltage and temperature collection circuit collected compares with setting value (corresponding maximum current, voltage and the temperature value allowed), if exceed setting value, comparator circuit output low level gives the I/O port of corresponding Master control chip; If not, comparator circuit then exports high level.The each I/O port status of Master control chip periodic queries, detects that a certain I/O port status is low, then give this failure counter the limit value indirect assignment of corresponding failure counter, and quote 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 is all set to 100A, and the limit value of two current fault counter is all set to 40.If output current or inductive current are continued above setting limit value, so from the time 50 μ s of over-current phenomenon avoidance to reported failures being detected for the first time.The limit value of input voltage is set to 210V, and the limit value of output voltage is set to 420V, and the limit value of two voltage fault count devices is all set to 40.If input or output voltage keeps to exceed setting limit value, so detect that overvoltage phenomenon is 50 μ s to the time of reported failures from first time.
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 set to 90 DEG C, and the limit value of two temperature fault counters is all set to 40.If upper brachium pontis or lower brachium pontis power tube constant temperature exceed setting limit value, so detect that excess temperature phenomenon is 10ms to the time of reported failures from first time.
As shown in Figure 4, for described bi-directional DC-DC converter hardware can recover CAN outage diagnostic method in fault.Described bi-directional DC-DC converter Master control chip with CAN module, when CAN module is in bus interruption status, its position, BO position; During normal condition, BO position resets.Master control chip reads the state of BO position in real time, and during position, BO position, the value of CAN outage counter adds 2, judge whether the value of CAN outage counter is more than or equal to 10, if so, then 10 assignment to CAN outage counter, and report CAN outage.This diagnosis sub-process is called once by the every 10ms of main flow, does not recover if having no progeny in CAN always, then the time to this fault of report from the interruption of generation CAN is 50ms.
3, software and hardware can recover the fault recovery flow process of fault.
As shown in Figure 5, for described bi-directional DC-DC converter software and hardware can recover the fault recovery flow process of fault.What be applicable to that software can recover that fault diagnosis and hardware can recover in fault diagnosis allly recovers fault.This sub-process is called once by the every 10ms of main flow, the value of the failure counter that respectively can recover fault is subtracted 1 at every turn, 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 set restriction, reports corresponding unrecoverable failure.This type of fault is once quoting, and not self recovery, can recover after only having program to restart.
5, hardware unrecoverable failure diagnostic method
Bi-directional DC-DC converter hardware unrecoverable failure comprises upper and lower brachium pontis power tube temperature sensor fault and IGBT door drives saturated fault.
As shown in Figure 7, upper and lower brachium pontis power tube temperature sensor fault diagnostic method 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, or be greater than 4000, then report corresponding power tube temperature sensor fault, this fault is once quoting, and just not self recovery, can remove this fault after only restarting Master control chip.
As shown in Figure 8, IGBT door drives saturated method for diagnosing faults as follows: when the driving chip of described bi-directional DC-DC converter breaks down, and output low level drives saturated indicating fault I/O port to Master control chip IGBT door; If driving chip is working properly, then export high level to this I/O port.This I/O port status of Master control chip periodic queries, if detect, I/O port status is low, then report IGBT door to drive saturated fault, and this fault is once quoting, and just not self recovery, can remove this fault after only restarting driving chip.
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, reported failures, 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, reported failures, and abnormal conditions do not remove 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 condition adjudgement failure condition of this I/O port of inquiry.
2. method for diagnosing faults according to claim 1, it is characterized in that: also comprise the fault recovery that software and hardware can recover fault, this fault recovery is called once at regular intervals by fault diagnosis main flow, the value of the failure counter that respectively can recover fault is subtracted 1 at every turn, until be kept to 0, remove fault.
3. method for diagnosing faults according to claim 1 and 2, 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 detecting that electric current, voltage or temperature exceed the maximum current of permission, voltage or temperature limit, just counting is added to its corresponding failure counter, when count value exceedes setting count limit, count limit assignment to counter, and by its corresponding abort situation position.
4. method for diagnosing faults according to claim 1 and 2, 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, the magnitude of voltage collect electric current, voltage and temperature collection circuit and setting value compare, if exceed setting value, comparator circuit output low level gives the I/O port of corresponding Master control chip; If do not exceed setting value, comparator circuit then exports high level, each I/O port status of Master control chip periodic queries, detects that a certain I/O port status is low, then give this failure counter the limit value indirect assignment of corresponding failure counter, and quote corresponding fault.
5. method for diagnosing faults according to claim 1 and 2, it is characterized in that: 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 set restriction, report corresponding unrecoverable failure.
6. method for diagnosing faults according to claim 1 and 2, is characterized in that: hardware unrecoverable failure comprises upper and lower brachium pontis power tube temperature sensor fault and IGBT door drives 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, then report corresponding power tube temperature sensor fault, this fault is once quoting, just not self recovery, can remove this fault after only restarting Master control chip.
8. method for diagnosing faults according to claim 6, is characterized in that: when the driving chip of described bi-directional DC-DC converter breaks down, and output low level drives saturated indicating fault I/O port to Master control chip IGBT door; If driving chip is working properly, then export high level to this I/O port, this I/O port status of Master control chip periodic queries, if detect, I/O port status is low, IGBT door is then reported to drive saturated fault, this fault is once quoting, and just not self recovery, can remove this fault after only restarting driving chip.
9. the method for diagnosing faults according to any one of claim 1,2,7,8, is characterized in that: call once to overcurrent, fault diagnosis flow scheme that overvoltage is relevant by the every 50 μ s of master routine; The fault diagnosis flow scheme relevant to excess temperature is called once by the every 10ms of main flow.
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| CN104038150B (en) * | 2014-06-27 | 2016-09-14 | 国家电网公司 | A kind of modularity, centralized photovoltaic generation interface arrangement |
| 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 |
| CN109703570B (en) * | 2017-10-25 | 2020-09-29 | 上海汽车集团股份有限公司 | Fault processing method and device of motor control system |
| CN112115663B (en) * | 2020-09-23 | 2022-09-27 | 哈尔滨工业大学 | Feature extraction method for early multi-source fault diagnosis of DC-DC converter |
| CN112255542B (en) * | 2020-09-30 | 2022-07-15 | 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 |
| CN114384446B (en) * | 2021-12-28 | 2023-10-10 | 联合汽车电子有限公司 | Hardware fault diagnosis method and device of DCDC conversion module and storage medium |
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