KR0172006B1 - Pointer-type display device - Google Patents

Abstract

[purpose]

An object of the present invention is to provide an erosion display device which is improved such that the movement of the guide is smooth and the response is good.

[Configuration]

The erosion display device for driving a display instruction by a stepper motor, comprising: a time counting means (4) for counting a set time; and an instruction position calculating means (4) for calculating a position to be instructed by the instruction at every time the time counting means The present position detecting means 2 for detecting the position pointed by the present instruction at each time when the means 1 and the time counting means 4 are present, The time count calculating means 3 for calculating the elapsed time and setting the time counting means 4 in the time counting means 4 and the drive pulse sending means 5 for sending out a pulse for driving the stepping motor at every time the timing counting means 4 do.

Description

Erosion (needle type) display device

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a configuration diagram of the first embodiment of the present invention.

FIG. 3 is a flow chart of the operation of this embodiment.

FIG. 4 is an operation flow chart of this embodiment.

FIG. 5 is a configuration diagram of a second embodiment of the present invention.

FIG. 6 is a flowchart of the operation of this embodiment.

FIG. 7 is an operation flow chart of this embodiment.

FIG. 8 is an operation explanatory diagram of a conventional example.

FIG. 9 is an explanatory diagram of operating characteristics of the present invention and the conventional example of the guide. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Indication position calculation means 2: Current position detection means

3: counting time calculating means 4: counting means

5: drive pulse transmitting means 6:

7: difference calculating means 10: step motor

11: Scale 12: Instructions

13: current position detection unit 14: indication position calculation unit

15: Timekeeping part 16: Timekeeping time calculating part

17: drive pulse transmission units 18 to 20: interface (I / O)

21: Processor (CPU) 22: Revelation A

23: current position counter 24: difference calculation section

[Industrial Applications]

The present invention relates to an erosion marking apparatus for driving a display instruction by a stepping motor.

[0003]

The step motor rotates by a unit angle? _O every time a drive pulse is inputted.

In the erosion display device which drives the conventional display instruction by a stepping motor, the difference? Between the instruction angle? _M instructed by the instruction at the predetermined time interval T and the current instruction angle? _P indicated by the current instruction is obtained, The number N of pulses is calculated, and the calculated N pulses are sent to the step motor to move the instruction to? _M.

That is, every time T

≪ / RTI >

As shown in Fig. 8 (a), the N pulses calculated in the equation (2) are sequentially transmitted to the step motor every time interval T _A to move the pointer.

For this reason, the deflection of the pointer is not a deflection of the pointer until the first pulse calculated in the next cycle T after the pulse is transmitted N times, and the pointer changes into a step shape, so that it is not a smooth motion.

A method of smoothing deflection of this instruction is described in Japanese Utility Model Publication No. 64-6556.

In this method, as shown in Fig. 8 (b), a pulse transmission interval for transmitting N pulses within a period T is averaged as T / N, and at the same time, the transmission of the first pulse is delayed by T / .

Thus, the movement of the guide is smooth by controlling the delivery start time and the delivery time interval of the pulse.

If the minimum pulse transmission time interval at which the step operation determined by the characteristic of the step motor can follow is T _A ,

Since the first pulse is delayed at the same time as the pulse transmission intervals are averaged,

Therefore, it can be seen that the value of T can not be smaller than a certain value.

[PROBLEMS TO BE SOLVED BY THE INVENTION]

In the erosion display device driven by the stepper motor, the drive pulse is transmitted at a time interval equal to or longer than the minimum time for which the stepping motion of the stepping motor can follow, and the delivery timing at that time is good in response to the change of the input signal , And a smooth response is required.

The pointing angle? _{M shown} in FIG. 9 shows an example in which the vehicle slowly accelerates and accelerates and is positioned at a constant speed.

The solid line, the minimum time interval in the step operation of the stepping motor can not follow T _A d, and a period T illustrated in FIG. 8 is T = _A and T = 6T Japanese chamber portion 64 in case of a 12T _A 6556, which is incorporated herein by reference in its entirety.

In this method, smoothness is improved, but (1) response delay occurs because the difference is calculated every cycle T. (2) Since the pulsing interval is changed in each cycle T, a sudden change occurs as shown in (a) of FIG. 9, and smoothness is lost. (3) If the period T is increased, (1) and (2) become worse. ④ As mentioned above, the period T can not be smaller than a certain value. In addition, there are various variations of the input signal, and there is a problem that it is difficult to set the period T adapted to all the changes.

That is, as in the prior art, in the method of performing calculation control for each predetermined time unit, that is, for calculating the difference every cycle T and changing the pulse sending interval, the above-described quick response and quick operation are incompatible, Do.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an erosion display device which is improved such that the movement of the hands is smooth and the responsiveness is good.

[MEANS FOR SOLVING THE PROBLEMS]

Means for implementing the present invention for solving the above-mentioned problems will be described with reference to FIG. FIG. 1 is a basic configuration diagram of the present invention.

The erosion display device according to the first aspect of the present invention is a erosion display device for driving a display instruction by a stepping motor. The erosion display device includes: a time counting means (4) for counting a set time; a time counting means A current position detection means (2) for detecting a position indicated by a current display instruction for each time that the time measurement means (4) indicates, and a current position detection means When the difference between the indicated position calculated by the current position detecting means 1 and the current position detected by the current position detecting means 2 is large and when the difference is small, And a drive pulse sending means (5) for sending out a pulse for driving the step motor for each time the timing means (4) shows.

The sending of the drive pulses from the drive pulse sending means 5 is performed in such a manner that there is no difference between the indication position calculated by the indication position calculation means 1 and the current position detected by the current position detection means 2 It is stopped.

The time count calculated by the time count calculating means 3 is set to a predetermined time (T ₁ ) when there is no difference between the indicated position and the current position.

The current position detected by the current position detection means 2 is derived from the count value at the reference origin which is raised or lowered each time the drive pulse sending means 5 sends out a pulse.

Further, in the second means, in the erosion display device for driving the display instruction by a step motor, the display means (6) for counting a predetermined time repeatedly and the display instruction means A current position detecting means (2) for detecting a position pointed by the current instruction for each time that the counting A means (6) A difference calculating means (7) for calculating a difference between an indication position calculated by the position calculating means (1) and a current position detected by the current position detecting means (2) and updating the record, (4), and when the value corresponding to the difference value is large from the difference value recorded by the difference calculating means (7) every time the time counting means (4) indicates, when the difference value is small, Set in the timing means (4) Reveals time calculation means 3, the timer means (4) are revealed for each time a drive pulse delivery means (5) and, for transmitting a pulse to drive the step motor.

The sending of the drive pulses from the drive pulse sending means 5 is stopped when the difference value recorded by the difference calculating means 7 is not more than a predetermined value.

When the difference value recorded by the difference calculating means 7 is equal to or smaller than a predetermined value, a predetermined time T is set as the time-of-counting time calculated by the time calculating means 3.

The current position detected by the current position detecting means 2 is derived from a count value from a reference origin which is raised or lowered each time the drive pulse transmitting means 5 sends out a pulse.

[Action]

In the first means, the time counting means (4) counts the time calculated by the time count calculating means (3).

The pointing position calculating means 1 calculates the pointing position to be supported by the pointer at every time pointed by the time counting means 4.

The time count calculating means 3 calculates the time point between the pointed position calculated by the pointing position calculating means 1 and the current position pointed by the pointer detected by the current position detecting means 2 When the difference is large, it is short. When the difference is small, the long time is calculated.

The drive pulse sending means 5 sends a drive pulse to the stepping motor every time the timing means 4 indicates.

When there is no difference between the indication position calculated by the indication position calculation means 1 and the current position detected by the current position detection means 2, the drive pulse transmission means 5 stops the delivery of the drive pulse.

When there is no difference between the indicated position and the current position, the time count calculated by the time count calculation means 3 is output as the time count of the constant value T ₁ .

The current position detection means 2 derives the current position from the count value from the reference origin which is raised or lowered each time the pulse is transmitted from the drive pulse transmission means 5. [

In the second means, the pointing position calculating means 1 calculates the pointing position which is to be blocked by the pointer at every predetermined time period indicated by the time measuring means (A) 6.

The current position detecting means 2 detects the present position indicated by the current instruction at a predetermined time period which is measured by the taking-out means 6. [

The difference calculation means 7 calculates the difference between the indication position calculated by the indication position calculation means 1 and the present position detected by the current position detection means 2 and updates the recording.

The time count calculation means 3 reads the difference value recorded by the difference calculation means 7 every time the timing means 4 shows it, calculates the difference value when the difference value is large, calculates it for a long time when the difference value is small, (4).

The driving pulse sending means 5 sends a stepping motor driving pulse every time the timing means 4 takes the time.

In addition, the drive pulse sending means 5 stops sending the drive pulses when the difference value recorded by the difference calculating means 7 is not more than a predetermined value.

The time count calculation means 3 outputs a certain value T ₁ as the time count when the difference value recorded by the difference calculation means 7 is equal to or smaller than a predetermined value.

The current position detection means 2 derives the current position from the count value from the reference origin which is raised or lowered each time the pulse is transmitted from the drive pulse sending means 5.

As described above, in the first means, the calculation of the difference between the pointed position to which the pointer is to be pointed and the current position indicated by the current pointer is short when the previously calculated difference is large and is calculated after a long time when the difference is small Further, since the drive pulse is transmitted to the step motor after the calculated time, when the difference is large, the pulse is transmitted in a short time and when the difference is small, the step motor is rotated, the movement of the guide is smooth, Can be improved.

In the case where there is no difference between the indicated position and the current position, the dispensing of the pulse for driving the step motor is stopped. Thus, the position of the pointer is raised and the vibration is reduced.

If there is no difference between the pointed position and the current position, the time of retraction is set to T _1. Therefore, if a difference is found after the determination that there is no difference, the movement of the pointer is started after T ₁ second, It can be made good.

Since the detection of the current position is derived from the count value from the reference origin by raising or lowering the count value every time a pulse is sent to the step motor, it is possible to easily detect the current position without requiring an expensive encoder .

In the second means, the difference between the pointed position indicated by the pointer and the current position indicated by the pointer is calculated every predetermined time to update the recorded position, and the readout time of the recorded difference is read as the difference The drive pulse is transmitted to the stepper motor in synchronization with the reading of the difference. Therefore, when the difference is large, the pulse is transmitted in a short time. When the difference is small, the pulse is transmitted at a long time interval The step motor rotates, the movement of the hands is smooth, and at the same time, the responsiveness can be improved.

When there is no difference between the pointed position and the current position, the dispensing of the pulse for driving the stepping motor is stopped, so that the pointed position of the pointer is prevented from rising and falling, and the indication value is easy to read.

When there is no difference between the pointed position and the current position, the time of retraction is set to T _1. Therefore, when a difference occurs after it is determined that there is no difference, movement of the pointer is started after T ₁ seconds, can do.

Since the current position is derived from the count value from the reference origin which raises or lowers the counter value every time a pulse is sent to the step motor, it is possible to easily detect the current position without requiring an expensive encoder You can.

[Example]

An embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG.

FIG. 2 is a configuration diagram of the first embodiment of the present invention, FIG. 3, and FIG. 4 and FIG. 4 are operational flowcharts of this embodiment.

13 is a current position detector for detecting the current position indicated by the pointer 12; 14 is a current position detecting unit for detecting a current position indicated by the pointer 12; 12 is a stepping motor; 11 is a scale; 12 is a pointer fixed to the rotary shaft of the step motor 10; 15 is a timing unit, 16 is a time counting unit, 17 is a drive pulse transmitting unit, 18 to 20 are interfaces (I / O), and 21 is a processor (CPU) for performing processing.

The embodiment of FIG. 2 is an example in which the I / O 18 displays the speed as a guide on the basis of a signal from a traveling sensor that transmits a pulse every time the vehicle travels a unit distance.

The step motor 10 rotates by a unit angle? _O when a drive pulse is input with the I / O 19 therebetween.

First, the operation of the indicated position calculation unit 14 will be described with reference to FIG. The operation of the indicating position calculating section 14 is started when the pulse is inputted from the I / O 18. In step S11, the difference t between the time at which the pulse was input from the previous I / O 18 and the present input time is calculated.

In step S12,

However, K _B is an integer

And the indicated position? _M is calculated.

That is, in step S12, the speed is calculated from the pulse interval input from the I / O 18, and the rotation angle? _M of the pointer 12 on the scale 11 corresponding to the calculated speed is calculated.

In step S13, the indicated position? _M calculated in step S12 is recorded in a memory (not shown), and the interrupting process is terminated.

As described above, the indicating position calculating section 14 calculates a new pointing position every time a pulse is inputted from the traveling sensor and updates the recording.

Further, in the embodiment, the pointed position is calculated at time t from the previous pulse input, but it is also possible to record the pointed position by calculating the pointed position at a time from several pulses before .

Next, the operation of the first embodiment will be described with reference to FIG.

In the process S1, the drive pulse sending section 17 judges whether or not the count value T of the time counting section 15 is 0 or not, and if the judgment is NO, the drive pulse sending section 17 waits until it becomes an example.

In other words, the timekeeping unit 15 is constituted by a descent counter and judges whether or not the count value has decreased to 0 from the set value.

In step S2, the time-of-day calculating section 16 reads the indicated position? _M calculated and recorded by the indication position calculating section 14 as described in Fig. 4, And reads the current position? _P of the pointer 12 detected by the current position detector 13,

To calculate the difference &thetas;.

In step S3, the time-of-day calculating section 16 calculates the time difference?

When the determination is YES, the processing goes to step S4 to set T ₁ in the drop counter of the time counting section 15 to start counting. T ₁ will be described later.

In step S5, the time-of-count calculation unit 16 calculates

However, K _A is an integer

To calculate the counting time T _S , shifts to the process S6, sets T _S in the time counting unit 15, and starts counting.

In step S7, the drive pulse sending section 17 sends a drive pulse to the stepper motor 10 via the I / O 19 and moves to process S1.

Further, when the difference? Calculated in the process S2 is an integer, the flag is set to 1 and the flag is set to 0 in the case of the number of pulses. The step motor 10 rotates the unit angle? _{O in} the direction corresponding to this flag.

As described above, when the difference? Between the indicated position? _M and the current position? _P is large, the time to be displayed to the time unit 15 is shortened, and when? Is small, As shown in the figure, a characteristic that smoothness and responsiveness are good is obtained.

The reason for determining whether or not |? | = 0 in process S3 is as follows. When the drive pulse is transmitted at |? | = 0, the position indicated by the pointer 12 becomes larger than the position currently indicated, The delivery of the drive pulse is stopped and re-judged at T ₁ second.

Although the value of T ₁ can be set arbitrarily, by setting T ₁ small, even if the indication position newly calculated by the indication position calculating section 14 is changed during that time and the difference θ is generated, the indicator is moved to the indication position The response can be improved.

Further, when the expressions? _{M and} ? _P are not integer multiples of the unit angle? _O in which the pointer is rotated by driving the step motor, the determination in step S3 may be made as |? |? _O / 2.

In addition, when the one T _S calculated in the process S5 is very large, since it can cope with even the new difference θ produced between the, for example, T _S is set to T ₀ in greater process S6 than T ₀ to the timing unit (15) So that the timing can be started to improve the responsiveness.

In addition, transmission of the driving pulse in the process S7 is, T and _S, but prior to transmission timing, may be to transmit after T _S revealed.

In addition, the operation, the rotational speed _P dθ / dt of the current position _P in the case where θ indicating position θ _M is an abrupt change significantly

, And solving the differential equation of the equation (9)

.

That is, as shown by the dotted line in FIG. 9,? _P moves smoothly and exponentially in? _M.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG. Fig. 5 is a configuration diagram of the second embodiment, Fig. 6 and Fig. 7 are operational flowcharts of this embodiment.

5, a step motor 10, a scale 11, a pointer 12, an indicated position calculating section 14, a time counting section 15, a time count calculating section 16, a drive pulse transmitting section 17, I / O 18 and 19, and CPU 21 are as described in FIG. Reference numeral 22 denotes a time measuring unit for counting time, 23 is a current position counter for recording the current position of the pointer, and 24 is a difference calculating unit.

The remainder A section 22 repeatedly displays a short period of time, for example, a minimum time during which the step motor 10 can be driven.

6, the present position counter 23 counts the counter value every time the drive pulse is transmitted to the step motor 10 by +/- 1 (+1 when the right-rotating pulse is transmitted, -1 when the rotating pulse is transmitted, and the count value from the reference origin of the pointer is recorded.

Similarly to the first embodiment, the indicated position calculating section 14 performs the processing described in FIG. 4 to calculate the indicated position? _M and updates the recording.

Next, the operation of the difference calculating section 24 will be described with reference to FIG.

The processing of the difference calculator 24 is performed by interruption processing and is started every time when the remainder A unit 22 ends the counting of a certain time.

In step S21, the indicated position & amp _; thetas; _M calculated and recorded by the indicated position calculating section 14 is read, and the process goes to step 22 to read the count value N _P counted by the current position counter 23

However, θ _O is an angle at which the pointer rotates with respect to one drive pulse to calculate the current position θ _P.

In step S23,

To calculate the difference &thetas;.

In the process S24, the difference? Calculated in the process S23 is recorded in a memory (not shown) and the interrupt process is terminated.

As described above, the difference calculating section 24 calculates and updates the new difference? Every time the rendezvous section A shows a predetermined time.

Next, with reference to the sixth embodiment, the operation of the second embodiment will be described.

In FIG. 6, the processes S1 to S7 are as described in FIG.

In step S2a, the time-of-day calculating section 16 reads the difference? Recorded in a memory (not shown) of the difference calculating section 24. [

In step S8, the count value of the current position counter 23 is set to ± 1 (in step S7, a pulse for turning the pointer 12 to the step motor 12 is sent, that is, the difference θ read in step S2a is an integer , The count value is incremented by 1), and the process moves to step S1.

Further, in the second embodiment, the current position of the pointer is obtained based on the count value of the current position counter, but it may be obtained from the current position detection unit just as in the first embodiment.

Also in the first embodiment, as in the second embodiment, the current position may be obtained from the counter value of the current position counter.

[Effects of the Invention]

As described above, according to the present invention, the following effects can be obtained.

As above. In the first means, the calculation of the difference between the pointed position to be instructed by the pointer and the current position indicated by the pointer is calculated shortly when the difference calculated in the previous step is large and after a long time when the difference is small. Since the drive pulse is transmitted to the step motor after the calculation, when the difference is large, the pulse is transmitted at a short time interval, and when the difference is small, the pulse is transmitted at a long time interval to rotate the step motor, The response can be improved.

Further, when there is no difference between the indicated position and the current position, the dispensing of the pulse for driving the step motor is stopped, and the vibration to move the pointed position of the pointer up and down is eliminated, and the indicated value becomes easy to read.

If there is no difference between the pointed position and the current position, the time of measurement is set to T _1. Therefore, if a difference is found after the determination that there is no difference, the movement of the pointer is started after T ₁ seconds, I can do it.

Further, since the detection of the current position is derived from the count value from the reference origin that the count value is raised or lowered each time the pulse is transmitted to the step motor, the present position can be easily detected without requiring an expensive encoder have.

In the second means, the difference between the pointed position indicated by the pointer and the current position pointed by the current pointer is calculated every predetermined time to update the recording, and the readout time of the recorded difference is read out the previous time Since the drive pulse is transmitted to the stepper motor in synchronization with the reading of the difference, the pulse is transmitted for a short time when the difference is large, and the pulse is transmitted for a long time interval when the difference is small The step motor rotates, the movement of the hands is smooth, and at the same time, the responsiveness can be improved.

Further, when there is no difference between the indicated position and the current position, the dispensing of the pulse for driving the step motor is stopped, so that the pointed position of the pointer is prevented from rising and falling, and the indication value becomes easy to read.

When there is no difference between the pointed position and the current position, the time of retraction is set to T _1. Therefore, when a difference is determined to be no difference, the movement of the pointer is started after T ₁ seconds, .

Further, since detection of the current position is derived from the count value from the reference origin which is raised or lowered every time a pulse is sent to the step motor, the present position can be easily detected without requiring an expensive encoder .

Claims (12)

Timing means (15, 22) for counting down the set time set value; Target position calculation means (14) for calculating a target position & amp _; thetas; _M of the pointer each time the timing means (15, 22) completes countdown of the time set value; Current position detection means (13, 23) for detecting a current position? _P of the pointer every time the timing means completes countdown of the time set value; (16, 24) for calculating a difference? Between the target position? _M calculated by the target position calculation means (14) and the current position? _P detected by the current position detection means (13, 23) )and; The time calculating means 16 calculating the time set value on the basis of the difference? May calculate the short time set value if the difference? Is large and the long time set value if the difference? (22); And a pulse generator (17) for outputting a pulse train to the step motor (10) every time the time counting means (15, 22) counts down the time set value. Guidance display with instructions. The pulse generator according to claim 1, wherein the pulse generator (17) outputs a first signal to the step motor (10) together with a pulse train when the step motor (10) is to be rotated in a first direction, And outputs a second signal to the step motor (10) together with the pulse train when the motor (10) is to be rotated in the second direction. 3. The apparatus according to claim 2, wherein the current position detecting means (13, 23) counts up the pulses outputted from the pulse generator (17) when the step motor is to be rotated in the first direction, , And the difference? Is obtained from the count value of the current position detection means (13, 23). The instruction display device according to claim 1 or 2, wherein the pulse generator (17) stops outputting drive pulses to the stepper motor when the difference? Is equal to or smaller than a predetermined value? _O / 2. According to claim 1 or 2, wherein the difference between θ if the predetermined value θ _O / 2 or less, the period calculation means 16 is (15 to time T ₁ of a predetermined length in place of the time set value of the timer means ) Of the instruction display unit. The instruction display device according to claim 1 or 2, wherein when the difference? Is zero, the pulse generator (17) stops outputting drive pulses to the step motor. 3. The method according to claim 1 or 2, wherein, in the case where the difference? Is zero, the period calculation means (16) sets a time T ₁ of a predetermined length in the timing means (15) Featured instruction display. 4. The apparatus according to any one of claims 1 to 3, further comprising second timing means (22) for counting down a predetermined fixed time set value by said timing means (15, 22) 14) calculates the target position? _M of the pointer every time the second timing means completes countdown of the predetermined fixed time set value, and the current position detecting means (23) each time of timer means to finish counting down the predetermined fixed time set value, calculates the current position θ _P of the instructions, and the difference calculating means (24), on the basis of the current position and the target position of the And calculates a difference?. The method of claim 4, wherein said timer means whenever it has completed down-counting the predetermined fixed time set value (15, 22), the target position of the guidance by calculating θ _M, the current position detection means (230, the Article according to each time the timer means of the two finished counting down the predetermined fixed time set value, calculates the current position θ _P of the instructions, and the difference calculating means (24), the current position and the target position To calculate the difference &thetas;. 6. The apparatus according to claim 5, characterized in that the timing means (15, 22) includes a second timing means (22) for counting down predetermined fixed time set values, and the target position calculation means (14) Wherein the current position detecting means (23) calculates the target position & amp _; thetas; _M of the pointer every time the timing means of the current time counts down the predetermined fixed time set value, whenever it has completed counting down the fixed time set value, calculates the current position θ _P of the instructions, and the difference calculating means (24), on the basis of the current position and the target position characterized in that for calculating the difference between θ As shown in FIG. 7. The apparatus according to claim 6, characterized in that the timing means (15, 22) includes a second timing means (22) for counting down a predetermined fixed time set value, Wherein the current position detecting means (23) calculates the target position & amp _; thetas; _M of the pointer every time the timing means of the current time counts down the predetermined fixed time set value, whenever it has completed counting down the fixed time set value, calculates the current position θ _P of the instructions, and the difference calculating means (24), on the basis of the current position and the target position characterized in that for calculating the difference between θ As shown in FIG. The apparatus according to claim 7, characterized in that said timing means (15, 22) includes a second timing means (22) for counting down predetermined fixed time set values, said target position calculation means (14) Wherein the current position detecting means (23) calculates the target position & amp _; thetas; _M of the pointer every time the timing means of the current time counts down the predetermined fixed time set value, whenever it has completed counting down the fixed time set value, calculates the current position θ _P of the instructions, and the difference calculating means (24), on the basis of the current position and the target position characterized in that for calculating the difference between θ As shown in FIG.