CN109813357A - A kind of zero algorithm of pointer meters - Google Patents
A kind of zero algorithm of pointer meters Download PDFInfo
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- CN109813357A CN109813357A CN201811596648.4A CN201811596648A CN109813357A CN 109813357 A CN109813357 A CN 109813357A CN 201811596648 A CN201811596648 A CN 201811596648A CN 109813357 A CN109813357 A CN 109813357A
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- zero
- pointer
- stepper motor
- position limitation
- mechanical position
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Abstract
The present invention relates to a kind of zero algorithm of pointer meters, the specific process that is zeroed is as follows, step 1: assuming that pointer is located at the position farthest from zero mechanical position limitation of pointer in instrumentation；Step 2: stepper motor is to X ° of quick rotation of mechanical position limitation direction of zero, step 3: being imaginary zero-bit with current location, stepper motor rotates to be rotating forward from distal end mechanical position limitation to zero mechanical position limitation；Step 4: stepper motor is rotated to zero mechanical position limitation direction several times, and each time only continues several milliseconds；Step 5: setting stepper motor is to rotate forward from zero mechanical position limitation to the mechanical rotary limited in distal end, if current location is set as scale zero-bit, that is, completes zero.The invention enables no matter gauge pointer initial position wherein, can fast and accurately return to same position, to solve the problems, such as zero error caused by pointer initial position is different, guaranteeing that instrument once powers on zero in any case can normal use.This algorithm zero fast speed, consistency is good, error is small.
Description
Technical field
The present invention relates to a kind of stepper motor driven pointer meters, in particular by the automobile pointer of special zero algorithm
Instrument.
Background technique
Stepper motor possesses small volume, low in cost, high reliability, is very suitable in driving automobile instrument
Pointer meters.As the mass production of motor vehicles for civilian use is universal, stepper motor technology and application are constantly mature, instantly
Huge numbers of families are come into.
But stepper motor itself can not perceive turned position, it is necessary to carry out zero calibration to it using preceding.Zero school
Quasi- accuracy directly determines the precision of pointer meters, to influence instrument use.The included zero of stepper motor driver chip and
Stop zero instruction.Since its speed that is zeroed is slower, practical application generally first allows stepper motor to drive pointer to scale zero-bit side
It, can fast approaching scale zero-bit and to encounter stepping electric no matter guaranteeing that pointer be in any initial position to rotation maximum angle
The mechanical position limitation of machine rebounds, and is parked near scale zero-bit, then executes the zero of stepper motor driver chip again and stops zero
Instruction makes pointer just be parked in scale zero-bit, completes zero using some delay time fixed between two instructions.
Common zero algorithm can accurately be zeroed when pointer initial position is roughly the same, but the positional distance that is zeroed is mechanical
It limits farther out, generally at 1 ° or more.And many algorithms will cause pointer and obviously shake.In addition, once instrument is because using
Power-off or other factors cause pointer not to be parked near scale zero-bit suddenly in the process, when powering on again, due to pointer distance
Farther out, rebound of being rebuffed when the position stopped after rebound of being rebuffed and initial position are near scale zero-bit stops the mechanical position limitation of zero
There are subtle little deviation, this deviations substantially to be put by the zero of next step and stopping zero instruction for position firmly
Greatly, lead to gauge pointer off scale zero-bit, error is sometimes up to 2 ° or so.Faced with this situation, it is disconnected to generally require instrument
Electricity and re-power allow stepper motor be zeroed again after could restore normally, seriously affect the use of pointer meters.
Summary of the invention
Goal of the invention: the present invention proposes a kind of zero algorithm of optimization so that no matter pointer initial position wherein, can
It is enough fast and accurately to return to same position (scale zero-bit or the benchmark as scale zero-bit), to solve pointer initial position
Zero error problem caused by difference, guarantee instrument once powers on zero in any case can normal use.In addition, certain feelings
Under condition, pointer is near the mechanical position limitation to be zeroed after being rebuffed before zero or quickly, and location error very little, than
As instrument have the function of power-off zero etc can guarantee that powering on prior pointer is at scale zero-bit, which slightly adjusts
It is whole, it can be allowed to be parked in the position closer to mechanical position limitation in the case where pointer is not shaken.
Technical solution
A kind of zero algorithm of pointer meters, pointer meters include stepper motor, stepper motor driver chip, pointer, instrument
Dial plate, pointer are mounted on the axis of stepper motor, can be rotated between two mechanical position limitations of stepper motor, and stepper motor drives
Dynamic chip drives step motor shaft rotation drives the scale on pointer indicator dial plate, and the start bit of instrument board high scale is scale
Zero-bit, the purpose of zero are exactly that instrumentation prior pointer is allowed accurately to be directed toward scale zero-bit, and pointer is close to stepper motor side at this time
Mechanical position limitation, by the side, mechanical position limitation is defined as zero mechanical position limitation, another mechanical position limitation is defined as distal end mechanical position limitation,
Specific zero process is as follows:
Step 1: first assuming that pointer is located at the position or stepper motor farthest from zero mechanical position limitation of pointer in instrumentation
The mechanical spacing place in distal end；It is imaginary zero-bit with the position, stepper motor is rotated to be from distal end mechanical position limitation to zero mechanical position limitation
It rotates forward；
Step 2: stepper motor is to X ° of quick rotation of mechanical position limitation direction of zero, and rebound is parked in zero after guarantee pointer is rebuffed
Near mechanical position limitation；The maximum angle being wherein likely to occur between pointer and zero mechanical position limitation in X ° of > instrumentation, or
Take rotatable maximum angle between two mechanical position limitations；
Step 3: being imaginary zero-bit with current location, stepper motor is rotated to be from distal end mechanical position limitation to zero mechanical position limitation
It rotates forward；
Step 4: stepper motor is rotated to zero mechanical position limitation direction several times, and each time only continues several milliseconds；
Step 5: setting stepper motor is to rotate forward from zero mechanical position limitation to the mechanical rotary limited in distal end, if by present bit
It installs and otherwise continues to control N ° of stepper motor rotating forward, pointer is driven to be parked at scale zero-bit for scale zero-bit, i.e. completion zero,
Complete zero.
The real process of step 4 is that stepper motor drives pointer constantly close to zero mechanical position limitation at a slow speed, is produced after being rebuffed
Raw slightly rebound then proceedes to rotate to zero mechanical position limitation direction, and repeat to be rebuffed slightly rebound process, all until having rotated
Number is parked at zero mechanical position limitation；It is different according to the actual situation, suitable number of revolutions and time are selected, is guaranteed not
It is in any possible initial position by pointer, can be rebuffed in stepper motor rotation process and slightly rebound, and be rebuffed
The number that rebounds is less；Number of revolutions is between 30~500 times, and rotation time is between 5~25ms；Since rotation time is very short,
Bounce amplitudes also very little when being rebuffed, rebound number of being rebuffed is controlled within 1~4 time, therefore pointer jitter amplitude very little is not noticeable.
When completing step 2, if the error that rebound is parked near zero mechanical position limitation after pointer is rebuffed every time is not more than
0.1 °, the number of revolutions of stepper motor or time in step 4 are reduced, number of revolutions is between 20~300 times, and rotation time is 4
Between~20ms, stepper motor is made to drive pointer constantly close to zero mechanical position limitation, and be not rebuffed or is only occurring once touching
It is parked in the case where wall at zero mechanical position limitation, to avoid the shake of pointer.
Preferably, the position of scale zero-bit is set in step 5 far from zero mechanical position limitation, N ° between 2 °~4 °.
Preferably, before step 1, it also needs to carry out stepper motor driving self-check program, if self-test success, is walked
Rapid 1；Otherwise, stepper motor driving fail self-test instruction is sent, warning can not control stepper motor.
A kind of zero algorithm of pointer meters, before stepper motor starts zero, if pointer and zero mechanical position limitation it
Between distance be not more than 2 °, then directly progress above-mentioned steps 3 are to step 5.
Preferably, start range error between the prior pointer of zero and zero mechanical position limitation and reduce step 4 no more than 0.1 °
The number of revolutions of middle stepper motor or time, between 20~300 times, rotation time makes to walk number of revolutions between 4~20ms
It is constantly close to zero mechanical position limitation into motor drive pointer, and be parked in and lean in the case where not being rebuffed or only occurring primary rebuffed
At nearly zero mechanical position limitation, to avoid the shake of pointer.
Preferably, it before step 4, also needs to carry out stepper motor driving self-check program, if self-test success, is walked
Rapid 4；Otherwise, stepper motor driving fail self-test instruction is sent, warning can not control stepper motor.
The utility model has the advantages that accurate zero is stepper motor and the base that can work normally of pointer meters using stepper motor
Plinth.Resetting method proposed by the present invention does not use the included zero of stepper motor driver chip and stops zero instruction, but will
Process close to mechanical position limitation, rebound of being rebuffed is divided into multiple subtle, controllable segments, greatly reduces because of pointer initial position
Difference caused by zero error.After this algorithm, and though gauge pointer where, once powering on can be accurate
Be zeroed normal use.
And it is near the mechanical position limitation to be zeroed after pointer is rebuffed before zero or quickly, and location error
When very little, zero can be completed in the case where pointer is not shaken with adjustment algorithm details.
Generally speaking, this algorithm zero fast speed, consistency is good, error is small.Pointer shakes number during zero
Less, amplitude is small, can accomplish non-jitter under specific condition, improves the fluency of pointer meters zero.It is zeroed position more simultaneously
Close to mechanical position limitation so that the scale zero-bit of instrument can also closer to mechanical position limitation, increase instrument using rotation
Range.
Detailed description of the invention
Fig. 1 pointer meters zero flow chart of the present invention.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail:
It is zeroed and the instruction of stopping zero substantially amplifying error caused by initial position difference, therefore the present invention does not use
The two instructions complete zero using a kind of new zero algorithm.Zero algorithm is solidificated in dsp chip, and main task is
It allows as far as possible in the same position close to a certain stepper motor mechanical position limitation before the every task of pointer, by the position or apart from this
The position of one N ° of position is set as meter dial zero-bit, and it is 0 that scale zero-bit here, which can be scale, can also be other as needed
Number of division.As shown in Figure 1, having to be illustrated for the limit of stepper motor left side mechanical when pointer is in scale zero-bit
Body process is as follows.(the case where limiting when pointer is in scale zero-bit close to stepper motor right side mechanical need to only adjust related setting,
No longer it is described in detail.)
1, as shown in Figure 1, carrying out stepper motor drives self-check program, if self-test success, carries out in next step；Otherwise,
Stepper motor driving fail self-test instruction is sent, warning can not carry out control driving self-test to stepper motor；
2, assume that pointer is located at the limit of stepper motor right side mechanical, it is farthest from left side mechanical limit.It is limited with right side mechanical
For imaginary zero-bit, stepper motor rotates to be rotating forward counterclockwise.
3, X ° of mechanical position limitation quick rotation to the left counterclockwise of stepper motor guarantees that rebound is parked in left side mechanical limit after being rebuffed
Near position.The wherein maximum angle that is likely to occur or two between pointer and left side mechanical limit in X ° of > instrumentation
Rotatable maximum angle between mechanical position limitation.
4, setting current location is imaginary zero-bit, and stepper motor rotates to be rotating forward counterclockwise.
5, mechanical position limitation rotates stepper motor to the left counterclockwise several times, and each time only continues several milliseconds.It is practical
Process is that constantly mechanical position limitation is close to the left at a slow speed for stepper motor drive pointer, and slightly rebound is generated after being rebuffed, is then proceeded to
It rotates counterclockwise, the slightly rebound process that repeats to be rebuffed is parked in until having rotated all numbers close to left side mechanical spacing place.Root
According to actual conditions difference, suitable number of revolutions and time are selected, no matter guaranteeing that pointer is in any possible initial position, is turned
It can be rebuffed during dynamic and slightly rebound, and rebound number of being rebuffed is less.Number of revolutions can between 30~500 times,
Such as 30,50,100,150,200,300,400,500 times；Rotation time can be between 5~25ms, such as 5,10,15,20,25ms.
Since rotation time is very short, bounce amplitudes also very little when being rebuffed, rebound number of being rebuffed be can control in 1~4 time, therefore pointer is trembled
Dynamic amplitude very little is not noticeable.
6, setting is clockwise to rotate forward, if current location is set as scale zero-bit, that is, completes zero, otherwise, continues to control
Stepper motor processed rotates clockwise N °, and pointer is driven to be parked at scale zero-bit, completes zero.N ° generally between 2~4 °, such as
2、3、4°。
After being zeroed using the above method, the location error of stepper motor is usually no more than 0.1~0.2 °.
Rebound distance is identical when driving homotype pointer to be rebuffed with identical speed with model stepper motor, and error can be ignored.
If gauge pointer rests in some regions before being zeroed, enables speed when being rebuffed essentially identical, be then not in after being quickly rebuffed
Macroscopic location error, then can be adjusted to above-mentioned zero algorithm, the shake of pointer when avoiding being zeroed.Specific stream
Journey is similar with above-mentioned algorithm, and number of revolutions or rotation time are only adjusted in step 5.Such as number of revolutions can be reduced to 20
Between~200 times, such as 20,25,30,50,80,100,120,150,200 times, can make stepper motor drive pointer constantly to
Mechanical position limitation is close, and is parked in the case where not being rebuffed or primary be rebuffed only occur close to left side mechanical spacing place, to keep away
Exempt from the shake of pointer.
Claims (8)
1. a kind of zero algorithm of pointer meters, pointer meters include stepper motor, stepper motor driver chip, pointer, instrument
Disk, pointer are mounted on the axis of stepper motor, can be rotated between two mechanical position limitations of stepper motor, stepper motor driving
The rotation of chip drives motor shaft drives the scale on pointer indicator dial plate, and the start bit of instrument board high scale is scale zero-bit,
The purpose of zero is exactly that instrumentation prior pointer is allowed accurately to be directed toward scale zero-bit, and pointer is limited close to stepper motor side machinery at this time
Position, by the side, mechanical position limitation is defined as zero mechanical position limitation, another mechanical position limitation is defined as distal end mechanical position limitation, feature
It is, the specific process that is zeroed is as follows:
Step 1: first assuming that pointer is located at the position or stepper motor distal end farthest from zero mechanical position limitation of pointer in instrumentation
At mechanical position limitation；It is imaginary zero-bit with the position, stepper motor rotates to be rotating forward from distal end mechanical position limitation to zero mechanical position limitation；
Step 2: stepper motor is to X ° of quick rotation of mechanical position limitation direction of zero, and it is mechanical to be parked in zero for rebound after guarantee pointer is rebuffed
Near limit；The maximum angle being wherein likely to occur between pointer and zero mechanical position limitation in X ° of > instrumentation, or take and return
Rotatable maximum angle between zero mechanical position limitation and distal end mechanical position limitation；
Step 3: being imaginary zero-bit with current location, stepper motor is positive from distal end mechanical position limitation to zero mechanical position limitation rotation
Turn；
Step 4: stepper motor is rotated to zero mechanical position limitation direction several times, and each time only continues several milliseconds；
Step 5: setting stepper motor is to rotate forward from zero mechanical position limitation to the mechanical rotary limited in distal end, if present bit installed
For scale zero-bit, that is, zero is completed, otherwise, continues to control N ° of stepper motor rotating forward, drive pointer to be parked at scale zero-bit, complete
Zero.
2. zero algorithm as described in claim 1, it is characterised in that: the real process of step 4 is that stepper motor drives pointer
It is constantly close to zero mechanical position limitation at a slow speed, slightly rebound is generated after being rebuffed, and then proceedes to rotate to zero mechanical position limitation direction,
Repeat to be rebuffed slightly rebound process, until having rotated all numbers, is parked at zero mechanical position limitation；According to the actual situation not
Together, suitable number of revolutions and time are selected, no matter guaranteeing that pointer is in any possible initial position, stepper motor was rotated
It can be rebuffed in journey and slightly rebound, and rebound number of being rebuffed is less；Number of revolutions is between 30~500 times, when rotation
Between between 5~25ms；Since rotation time is very short, also very little, rebound number of being rebuffed are controlled 1~4 bounce amplitudes when being rebuffed
Within secondary, therefore pointer jitter amplitude very little is not noticeable.
3. zero algorithm as claimed in claim 2, it is characterised in that: when completing step 2, if pointer is anti-after being rebuffed every time
Bullet is parked in the error near zero mechanical position limitation no more than 0.1 °, reduces the number of revolutions of stepper motor or time in step 4, turns
For dynamic number between 20~300 times, rotation time makes stepper motor drive pointer constantly mechanical to zero between 4~20ms
It limits close, and is parked at zero mechanical position limitation in the case where not being rebuffed or primary be rebuffed only occur, to avoid referring to
The shake of needle.
4. zero algorithm as described in claim 1, it is characterised in that: set the position of scale zero-bit in step 5 far from zero
Mechanical position limitation, N ° between 2 °~4 °.
5. zero algorithm as described in claim 1, it is characterised in that: before step 1, also need to carry out stepper motor driving certainly
Program is examined, if self-test success, carries out step 1；Otherwise, stepper motor driving fail self-test instruction is sent, warning can not be right
Stepper motor is controlled.
6. a kind of zero algorithm of pointer meters, it is characterised in that: zero algorithm as claimed in claim 2 is based on, in stepping electricity
Before machine starts zero, if distance is not more than 2 ° between pointer and zero mechanical position limitation, carry out as claimed in claim 2
Step 3 is to step 5.
7. zero algorithm as claimed in claim 6, it is characterised in that: start between the prior pointer of zero and zero mechanical position limitation
Range error is not more than 0.1 °, and the number of revolutions or time, number of revolutions for reducing stepper motor in step 4 are taken second place 20~300
Between, rotation time makes stepper motor drive pointer constantly close to zero mechanical position limitation between 4~20ms, and be not rebuffed
Or only occur being parked in the case where primary be rebuffed at zero mechanical position limitation, to avoid the shake of pointer.
8. zero algorithm as claimed in claim 6, it is characterised in that: before step 4, also need to carry out stepper motor driving certainly
Program is examined, if self-test success, carries out step 4；Otherwise, stepper motor driving fail self-test instruction is sent, warning can not be right
Stepper motor is controlled.
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| CN201811596648.4A CN109813357B (en) | 2018-12-25 | 2018-12-25 | Return-to-zero algorithm of pointer instrument |
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| CN201811596648.4A CN109813357B (en) | 2018-12-25 | 2018-12-25 | Return-to-zero algorithm of pointer instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112762978A (en) * | 2020-12-25 | 2021-05-07 | 惠州市德赛西威汽车电子股份有限公司 | Calibration method for vehicle-mounted instrument pointer |
| CN112781642A (en) * | 2020-12-30 | 2021-05-11 | 北京青云航空仪表有限公司 | Calibration method of pointer instrument |
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| CN109813357B (en) | 2021-05-04 |
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Address after: No.5 courtyard, Shijun street, Renhe Town, Shunyi District, Beijing Applicant after: AVIC BEIJING KEEVEN AVIATION INSTRUMENT Co.,Ltd. Address before: 100086, No. 43 West Third Ring Road, Beijing, Haidian District Applicant before: AVIC BEIJING KEEVEN AVIATION INSTRUMENT Co.,Ltd. |
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