CN1972113A - Fault diagnosis and fault-tolerant control method for brushless motor position signal - Google Patents
Fault diagnosis and fault-tolerant control method for brushless motor position signal Download PDFInfo
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Abstract
This invention relates to one brushless motor position signal fault diagnosis method and fault tolerant control method, which comprises the following steps: directly using position signal up or down along signal status to real time test signal fault kind; according to the fault kind, real time computing phase exchange information along triggering DSP capture interval type for modification.
Description
One, technical field
The position signalling that the present invention relates to brushless electric machine (brshless DC motor, switched reluctance machines, the motor of similar such as double salient-pole electric machine) has trouble-free real-time diagnosis method, and carries out fault tolerant control method after position signalling breaks down.
Two, background technology
For brushless electric machine, position transducer is the key of the correct commutation of brushless electric machine.After permanent actual effect fault appears in position signalling, the phase change logic confusion of motor, the output torque reduces, and motor speed descends or is zero.In the system or specific occasion of some high reliability, not permission system breaks down, and should be able to continue to move a period of time after perhaps breaking down, and carries out troubleshooting then.Be to improve system reliability, make the motor can be, position signalling is carried out failure diagnosis and fault-tolerant control is necessary in correct position output commutation information.
Up to now, in numerous documents, brushless electric machines such as brshless DC motor, switched reluctance machines and double salient-pole electric machine have been carried out big quantity research at home and abroad.To the study limitation of position signalling in the method for adjustment of position signalling, and the simple description of position signalling fault, but the failure diagnosis of position signalling and the fault-tolerant Control Study after the fault thereof are not all related to.
Three, summary of the invention
The method for diagnosing faults and the fault tolerant control method that the purpose of this invention is to provide a kind of brushless motor position signal, the reliability of raising system.
(I) method for diagnosing faults of brushless motor position signal
The method for diagnosing faults of brushless motor position signal of the present invention directly utilizes the fault of the state real-time diagnosis position signalling of the rising edge of position signalling or trailing edge and position signalling, gives the kind that is out of order simultaneously.The present invention with three-phase brushless motor need three position transducers with four mutually brushless electric machine to need two position transducers be the example explanation.After breaking down, position signalling has two states:
1. perseverance is low level, i.e. H
i≡ 0, i=A, B, C;
2. perseverance is high level, i.e. H
i≡ 1, i=A, B, C.
The concrete grammar of three-phase brushless motor position signalling fault:
(1) permanent is low level failure diagnosis: catch to enter at the position signalling rising edge and have no progeny among the DSP (digital signal processor), this interrupt vector and the interrupt vector of prediction are compared, if do not wait, then the position signalling fault breaks down.If equate, upgrade the next interrupt vector of prediction.
(2) perseverance is the failure diagnosis of high level: on the basis of above-mentioned (1), in the sampling of system is interrupted, position signalling high level zone is divided into t1 and two zones of t2 simultaneously, prevents that the false triggering of phase sequence from interrupting.Detect in real time the state of three-phase position signal, table look-up 1 or table 2 diagnostic system whether fault and kind thereof.
Table 1 three phase electric machine position signalling perseverance is low failure diagnosis
| Failure mode | XL-X | X | Concrete fault |
| One |
1 | 37h | The A phase fault |
| -2 | The |
||
| 1 | 36h | The C phase fault | |
| Phase to |
0 | 36h | B, C fault |
| 37h | A, C fault | ||
| 38h | A, B fault | ||
Table 2 three phase electric machine position signalling perseverance is high failure diagnosis
| IO mouth level (CBA) | X | Failure mode |
| 011 | 36h | The B phase fault |
| 37h | The A phase fault | |
| 101 | 36h | The C phase fault |
| 38h | The A phase fault | |
| 110 | 37h | The C phase fault |
| 38h | The B phase fault | |
| 111 | 36h | B, C fault |
| 37h | A, C fault | |
| 38h | A, B fault |
The concrete grammar of four phase brushless motor position signal faults:
For four phase switch reluctance motors or double salient-pole electric machine, only need two position signalling P and Q.Therefore a position signalling cycle can be divided into four interval I～IV, by the level tracing trouble of real-time detection position signal.According to the state of position signalling, table look-up and 3 whether diagnose fault and failure mode thereof.
The failure diagnosis of table 3 four phase motor position signals
| IO level (PQ) | Interval | State |
| 00 | I | P is permanent in mutually hanging down fault |
| II | Phase to phase fault | |
| III | Q is permanent in mutually hanging down fault | |
| IV | Normally | |
| 01 | I | Phase to phase fault |
| II | P is permanent in mutually hanging down fault | |
| III | Normally | |
| IV | Q perseverance mutually is high fault | |
| 10 | I | Normally |
| II | Q is permanent in mutually hanging down fault | |
| III | Phase to phase fault | |
| IV | P perseverance mutually is high fault | |
| 11 | I | Q perseverance mutually is high fault |
| II | Normally | |
| III | P perseverance mutually is high fault | |
| IV | Phase to phase fault |
(II) fault tolerant control method of brushless motor position signal
The fault tolerant control method of brushless motor position signal of the present invention, be after system diagnostics has the position signalling fault, carry out that according to the kind of fault the position edges of signals is triggered DSP capture interrupt mode and make amendment, or calculate commutation information in real time in conjunction with DSP, the fault-tolerant control after the realization fault.The present invention with three-phase brushless motor need three position transducers with four mutually brushless electric machine to need two position transducers be the example explanation.Concrete grammar comprises:
(1) feature of the three-phase position signal of three-phase brushless motor is, a phase position signal rising edge almost overlaps for the trailing edge of position signalling mutually with last.Therefore, when a phase position signal fault, can utilize the trailing edge output commutation information of previous position signalling, be about to previous position signalling and be set to two along triggering the DSP interruption.
(2) for the position signalling of three-phase brushless motor, behind the signal fault of two-phase position, the trailing edge that can utilize correct phase to put signal replaces next phase position signal rising edge to send commutation information, simultaneously in conjunction with the high level of the real-time calculating location signal of the DSP T that holds time, T exports the commutation information of another phase position signal constantly after correct phase is put the signal trailing edge, arrive to end until correct phase is put the signal rising edge, wherein T is that correct phase is put the time that signal is kept high level in the one-period.
(3) for two the position signalling P and the Q of four phase brushless electric machines, after a phase position signal breaks down, calculate correct phase in real time and put signal high level time 2T.Behind Q phase position signal fault, export the commutation information of Q phase position signal rising edge after the time at P position signalling rising edge T; Rise the commutation information of exporting Q phase position signal trailing edge along T after the time under P phase position signal, until P phase position signal rising edge arrives to end, wherein T is that correct phase is put half that signal is kept high level time in the one-period.
Ingenious triggering edge and the level state diagnostic position signal fault thereof that utilizes position signalling of the present invention, according to the relation between the position signalling, by TMS320LF2407 DSP position signalling phase change logic controller is reconstructed, fault-tolerant control after the realization position signalling fault, improve system reliability, widen range of application.
The method does not need to add additional hardware, only utilizes software to carry out failure diagnosis and fault-tolerant control, and brushless electric machine is had bigger practical value.
Description of drawings
Fig. 1 is the three-phase position signal schematic diagram of three-phase brushless motor
Fig. 2 is the three-phase position signal method for diagnosing faults schematic diagram of three-phase brushless motor
Fig. 3 is the three-phase position signal method for diagnosing faults schematic diagram of improved three-phase brushless motor
Fig. 4 is the fault-tolerant control schematic diagram of position signalling behind the C phase fault
Fig. 5 is the fault-tolerant control schematic diagram of position signalling behind B, the C phase to phase fault
Fig. 6 is four phase brushless motor position signal failure diagnosises and fault-tolerant control schematic diagram
Fig. 7 is the capture interrupt software flow pattern
Fig. 8 is a sampling interrupt software flow chart
Embodiment
The kind of 1 position signalling fault
Three-phase brushless motor needs three position transducers, and three position transducers are 120 ° of mutual deviations spatially, and position signalling such as Fig. 1 of generation show that 1/3 cycle be that high point is put down, and 2/3 cycle was a low level, and the phase difference between three position signallings was 1/3 cycle.The position signalling fault can be divided into three kinds: a 1. phase fault; 2. phase to phase fault; 3. three-phase fault.In three kinds of faults, the probability that a phase position signal breaks down is the highest, next phase to phase fault, and failure rate is minimum to be that three-phase breaks down simultaneously.After breaking down, position signalling has two states:
1. perseverance is low level, i.e. H
i≡ 0, i=A, B, C;
2. perseverance is high level, i.e. H
i≡ 1, i=A, B, C.
For the four phase switch reluctance motors such as 8/6 utmost point and the biconvex utmost point, can be with two position transducers.Two position signallings such as Fig. 6 show that 1/2 cycle was a high level, and 1/2 cycle was a low level, differed for 1/4 cycle on the phase place.Therefore, 1. the fault of position signalling have only, 2. two kinds, and the method for its failure diagnosis and fault-tolerant control is slightly different with three phase electric machine, will provide at the 4th joint.2,3 joints are the failure diagnosis of three phase electric machine and fault-tolerant control.
The failure diagnosis of 2 three-phase brushless motor position signallings
The failure diagnosis of position signalling is based on DSP to the position signalling running state real-time monitoring, by position edges of signals or level are changed the fault of coming the diagnostic position signal.
2.1 perseverance is low level failure diagnosis
Therefore level is low always after the position signalling fault, can not form the edge and trigger and enter capture interrupt and carry out commutation.Three-phase position signal A, B, C are through directly linking mouthful cap4 ~ cap6 that catches of DSP after the shaping, trigger interruption at each position signalling rising edge, enter the capture interrupt subprogram, the output phase change logic reads corresponding interrupt vector and is respectively 36h, 37h, 38h (hexadecimal number).Fig. 2 upper left corner enters the interrupt vector of capture interrupt for this, and the lower right corner enters the interrupt vector of capture interrupt next time for prediction.Detecting interrupt vector as the capture interrupt subprogram is 37h, and system is judged to be B phase position signal rising edge and triggers interruption, and the next interrupt vector that enters of prediction simultaneously is 38h, i.e. the C phase.
The position signalling rising edge trigger enter capture interrupt after, read the interrupt vector that enters interruption, compare with the interrupt vector of prediction, if identical, be the interruption that normally enters, prediction simultaneously enters the vector of interruption next time, as inequality then be fault.
After breaking down, the interrupt vector and the interrupt vector of last time that this can be entered interruption are compared, if equate to be two-phase position signal fault.If do not wait, the interrupt vector of last time is deducted this interrupt vector, judge corresponding fault according to their difference.Make that this interrupt vector is X, last time, interrupt vector was XL, and when the difference of twice interrupt vector was 1, according to this interrupt vector that enters, diagnosis was A phase fault or C phase fault.Concrete differentiation is as shown in table 1.
For perseverance after the three-phase position signal fault is that low failure diagnosis will be described at 2.2 joints.
2.2 perseverance is the failure diagnosis of high level
Break down during for low level under the position signalling normal condition, perseverance is a high level after the fault, forms a rising edge during fault.This rising edge will trigger DSP and enter capture interrupt.Interrupt thinking normal capture interrupt with the triggering that 2.1 methods that save may cause some fault.For example after A phase rising edge, before B phase rising edge arrives, B phase position signal breaks down, level is uprised by low.DSP detects the triggering of B phase rising edge and enters interruption simultaneously.Detecting this interrupt vector is 37h, identical with the prediction interrupt vector, and promptly normal interruption is thought by system, so revise phase change logic, makes the system triggers logical miss, and motor output torque reduces.Therefore be not suitable for 2.1 method for diagnosing faults that save that perseverance is the situation of high level after the fault.
But the method for 2.1 joints can be with incorrect phase sequence diagnosing malfunction.Break down mutually as C between A, B rising edge, the prediction interrupt vector is 37h, and this interrupt vector is 38h., need improve the method for 2.1 joints, method such as Fig. 3 show for this reason.
With A is example mutually, is divided into two regional t1 and t2 by the high level interval to each position signalling, all is considered as undesired interruption in any capture interrupt of t1 internal trigger, can avoid the false triggering of B phase to interrupt like this.According to rotating speed of motor, adjust the value of t1, make t2 short as far as possible.
Interrupt detecting in real time the level of three-phase position signal by systematic sampling, under the normal condition, after A phase position signal rising edge triggers and enters capture interrupt, reading the three-phase position signal level is 001b (binary number, on behalf of C phase, second, several first an of left side represent the B phase, represent the A phase for the 3rd), and be maintained to till next phase rising edge.Equally, after B entered capture interrupt mutually, the three-phase position signal value was 010b.After C entered capture interrupt mutually, the three-phase position signal value was 100b.Therefore by detect in real time the three-phase position signal level just can decision-making system fault whether, the while just can be diagnosed out of order kind according to this interrupt vector that enters, concrete failure diagnosis such as table 2 show.
As the above analysis, after the fault perseverance to be that the failure diagnosis of high level is permanent want complexity for low level.By the state of real-time monitoring location signal, timely diagnostic position signal fault, and provide the corresponding failure index signal, improve the accuracy and the rapidity of failure diagnosis, for realizing that effectively fault-tolerant control provides condition.
After three-phase fault appearred in system, the position signalling level was low or high always, can't trigger entering interruption.For detecting three-phase fault, can a time t be set according to rotating speed, behind system-computed overtime t, still do not have position signalling to trigger and enter capture interrupt, and to detect the three-phase position signal level be 000 or 111 that then system is judged to be the three-phase position signal fault.
The fault-tolerant control of 3 three-phase brushless motor position signallings
After system diagnostics has the position signalling fault, by the phase change logic controller under the different faults state is reconstructed, make after fault, to change corresponding handling procedure immediately over to, reduce transit time.Owing to when three-phase position signal breaks down simultaneously, can't determine the datum mark of arbitrary phase, also can't calculate rotating speed of motor, so can't realize fault-tolerant control after the three-phase position signal fault according to position signalling.With one mutually or two-phase position signal fault compare, therefore the probability that three-phase position signal breaks down simultaneously is very little, carries out fault-tolerant Control Study at a phase position signal fault and two-phase position signal fault.
3.1 the fault-tolerant control of a phase position signal fault
As can be seen from Figure 1, the trailing edge of the rising edge of a phase position signal and last phase position signal overlaps fully.Therefore when a phase position signal breaks down, can substitute the fault-signal rising edge with the trailing edge of last phase position signal.With C phase position signal fault is example, can utilize B phase position signal trailing edge to trigger and interrupt entering interruption subroutine, commutation information during output C phase position signal rising edge.After detecting fault in real time, B phase position signal is set to two edges and triggers, and promptly the rising edge of B phase position signal and trailing edge can both trigger and enter capture interrupt, carries out corresponding phase change logic control, shows as Fig. 4.In like manner, when breaking down mutually as if A, it is two along triggering that C is phase-changed into; If during the B phase fault, it is two along triggering that A is phase-changed into.
3.2 the fault-tolerant control of two-phase position signal fault
When the two-phase position signalling breaks down, utilize correct position signalling trailing edge can substitute the rising edge of next phase position signal, but because a phase position signal has only two edges, can only obtain in the moment of the rising edge of another phase position signal by accurate Calculation.Breaking down with B, C two-phase position signalling is example, A phase position signal can be provided with twoly along triggering, and this moment, the trailing edge of A phase replaced the rising edge output commutation information of B phase, showed as Fig. 5.Trigger because A phase position signal is two edges, interrupt vector all is 36h, and the electrical level judging that needs the binding site signal is that rising edge triggers or trailing edge triggers.If having no progeny in entering and reading level is 1,,, otherwise be the trailing edge triggering simultaneously with the count value zero clearing of timer then for rising edge triggers.When next A phase position signal trailing edge triggering entered interruption, the value of preserving timer was exported B phase position signal rising edge commutation information simultaneously in variable T.Then in the sampling period, constantly read the value of timer, when the value of timer during more than or equal to T, output corresponding C phase position signal rising edge phase change logic, be maintained to till the A phase rising edge, wherein T is that correct phase is put the time that signal is kept high level in the one-period.
The failure diagnosis of 4 four phase brushless motor position signals and fault-tolerant control
4.1 failure diagnosis
Can be for 8/6 utmost point, four phase switch reluctance motors and double salient-pole electric machine only with two position transducers, so the installation site of position transducer is slightly different with three-phase brushless motor.Rising edge and trailing edge between position signalling P, the Q of two position transducer outputs are not to overlap fully, but its diagnostic method is similar to three phase electric machine.
A position signalling cycle can be divided into 4 area I～IV, and the width in four zones is finished identical.Because therefore each interval P, Q signal logic level difference can specifically be shown as table 3 according to the fault of the interval level state diagnostic position signal of difference.
4.2 fault-tolerant control
Owing to have only the two-phase position signalling, therefore when two-phase position signalling simultaneous faults, can't realize fault-tolerant control, the present invention provides the fault tolerant control method behind the phase position signal fault.
After for example the Q position signalling broke down, the time of calculating in real time between rising edge of P phase position signal and the next trailing edge by the DSP timer internal was 2T.T behind P signal rising edge is exactly the rising edge of Q signal constantly, and the T behind the trailing edge of P signal is exactly the trailing edge of Q signal constantly.Therefore, can reappear the information of Q signal by computed in software, the fault-tolerant control after the realization fault is shown as Fig. 6, and wherein T is that correct phase is put half that signal is kept high level time in the one-period.
Claims (2)
1, a kind of method for diagnosing faults of brushless motor position signal is characterized in that: directly utilize the fault of the state real-time diagnosis position signalling of the rising edge of position signalling or trailing edge and position signalling, give the kind that is out of order simultaneously;
(a). the concrete grammar for three-phase brushless motor position signalling failure diagnosis is:
(1). perseverance for low level failure diagnosis was after motor position signal broke down, catch to enter among the DSP at the motor position signal rising edge and have no progeny, this the interrupt vector and the interrupt vector of prediction are compared, and comparative result is not if wait, and then position signalling breaks down; If equate, upgrade the next interrupt vector of prediction;
(2). perseverance for the failure diagnosis of high level was after motor position signal broke down, break down the back perseverance on the basis of low level failure diagnosis at above-mentioned motor position signal, simultaneously in the sampling of electric system is interrupted, position signalling high level zone is divided into two zones, the false triggering that prevents phase sequence is interrupted, the real-time state that detects three-phase position signal is looked into following table 1 or whether table 2 diagnosing motor system breaks down and kind;
Table 1 three phase electric machine position signalling perseverance is low failure diagnosis
Table 2 three phase electric machine position signalling perseverance is high failure diagnosis
(b). the concrete grammar for four phase brushless motor position signal failure diagnosises is, a position signalling cycle is divided into four intervals of I～IV, by the level tracing trouble of real-time detection position signal, according to the state of position signalling, looks into following table 3:
The failure diagnosis of table 3 four phase motor position signals
Diagnosis is otherwise breaks down and failure mode.
2, a kind of fault tolerant control method of brushless motor position signal, it is characterized in that, according to failure mode to the brushless motor position signal failure diagnosis, carry out that the position edges of signals is triggered DSP capture interrupt mode and make amendment or calculate commutation information in real time, realize the fault-tolerant control after the fault in conjunction with DSP:
(a). the fault tolerant control method of three-phase brushless motor position signalling fault is, when break down when a phase position signal (1), utilizes the trailing edge output commutation information of last phase position signal, is about to last phase position signal and is set to and twoly interrupts along triggering DSP; (2) behind the signal fault of two-phase position, utilize the trailing edge of tram signal to replace the rising edge of next phase position signal to trigger commutation information, the time cycle that while keeps in conjunction with the real-time calculating location signal of DSP high level, a time cycle after correct phase is put the signal trailing edge is exported the commutation information of another phase position signal, arrives to end until correct phase is put the signal rising edge;
(b). the fault tolerant control method of four phase brushless motor position signal faults is, after a phase position signal broke down, calculating correct phase in real time, to put the signal high level time be 2 time cycles.After promptly a phase position signal breaks down, put the signal rising edge in adjacent phase and export the commutation information that above-mentioned fault phase is put signal rising edge (or trailing edge) after a time cycle; The commutation information of putting signal trailing edge output abort situation signal trailing edge (or rising edge) after time cycle in the adjacent phase of this fault phase is until till adjacent phase puts the signal rising edge and arrive.
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| CN112332747B (en) * | 2020-10-12 | 2022-05-20 | 南京信息工程大学 | Rapid fault diagnosis control method for position square wave signals of switched reluctance motor |
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