DE19608480A1 - Pointer type speedometer e.g. for motor vehicle - Google Patents

Pointer type speedometer e.g. for motor vehicle

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Publication number
DE19608480A1
DE19608480A1 DE1996108480 DE19608480A DE19608480A1 DE 19608480 A1 DE19608480 A1 DE 19608480A1 DE 1996108480 DE1996108480 DE 1996108480 DE 19608480 A DE19608480 A DE 19608480A DE 19608480 A1 DE19608480 A1 DE 19608480A1
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DE
Germany
Prior art keywords
period
pointer
energy saving
signal
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE1996108480
Other languages
German (de)
Other versions
DE19608480B4 (en
Inventor
Yuichi Kobayashi
Yoshio Nishio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yazaki Corp
Original Assignee
Yazaki Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP4524295A priority Critical patent/JPH08240445A/en
Application filed by Yazaki Corp filed Critical Yazaki Corp
Publication of DE19608480A1 publication Critical patent/DE19608480A1/en
Application granted granted Critical
Publication of DE19608480B4 publication Critical patent/DE19608480B4/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P8/00Arrangements for controlling dynamo-electric motors of the kind having motors rotating step by step
    • H02P8/14Arrangements for controlling speed or speed and torque
    • H02P8/16Reducing energy dissipated or supplied
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R7/00Instruments capable of converting two or more currents or voltages into a single mechanical displacement
    • G01R7/04Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming a quotient
    • G01R7/06Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming a quotient moving-iron type

Abstract

The meter has a pointer (1) whose position is determined by the number of stepping signals received by the stepper motor (14) driving it. A computer (21) calculates the required degree of movement of the pointer from information of the current position of the pointer and its required position. Provision is also made to reduce the power consumption when no movement is required by setting the pulse rate at a pre-set value. A timer circuit can be used to generate a signal which determines the instant for calculating the pointer deflection and this enables the period in which no movement is required to be determined.

Description

The invention relates to a pointer display device, the one Stepper motor used, more precisely a pointer indicator with reduced power consumption of the stepper motor that the Indicator pointer drives.

As pointer display devices, such as. B. one Speedometer that measures the vehicle speed or a tachometer that shows the machine speed displays, display devices are known in which the Display pointer is driven by a stepper motor. This Stepper motor turns according to the entered Number of steps and has the advantage that the amount of rotation for every step signal is exact and its control is simple.

Structure and operation of this stepper motor will be described with reference to FIG. 7.

Fig. 7A shows the configuration of a 4-phase stepping motor, the stepping motor 14 has a rotor 141 and a stator 142. The rotor 141 is formed by a magnet and has a rotary shaft 143 which is attached to it. The rotary shaft 143 is connected to a display pointer (not shown) via gears.

The stator 142 has projections 144 a-d which are formed at 90 ° distances and project in the direction of the rotor 141 , and coils 145 a-d which are wound around the projections.

The projection 144 a and the coil 145 a form the phase a, the projection 144 b and the coil 145 b form the phase b, etc. The projections 144 a-d and the coils 145 a-d form an excitation phase ad in this way.

Electric current is supplied to coil 145 a, which forms phase a. That is, a signal pulse is applied to the coil and phase a generates a magnetic field and a south pole occurs at the end of the projection 144 a on the rotor side. The projection 144 a and the north pole of the rotor 141 face each other.

While a signal pulse is applied to the coil 145 a, the application of another signal pulse to the coil 145 b, which forms the phase b, generates a different magnetic field. The fields formed by these phases a, b form a combined field that generates a south pole in an intermediate position between phase a and phase b. This causes the rotor 141 to rotate 45 ° clockwise from position a.

Such a turning operation of the stepping motor 14 will be described with reference to FIG. 7B. Figure 7B shows drive signals given to the stepper motor. In the figure, "phase a" - "phase d" represent signal pulses which are applied to the coils 145 a-d of the stator 142 , which form the phases ad. If a signal pulse is only applied to phase a, a south pole is generated in phase a, as mentioned above, causing the north pole of rotor 141 to position itself opposite phase a (projection 144 a). For the sake of simplicity, this position is referred to as 0 °.

Next, if the signal pulse is still applied to phase a, a signal pulse is applied to phase b. This creates a south pole in an intermediate position between phase a and phase b. The rotor 141 is then positioned in a position that is offset clockwise by 45 ° with respect to phase a. This position is called 45 °.

Next, the pulse signal to phase a is turned off, while the pulse signal remains applied only to phase b, so that a south pole is generated on phase b. This causes the rotor 141 to rotate another 45 ° clockwise until its north pole faces phase b (projection 144 b). This means that it is positioned in the 90 ° position.

Subsequently, the pulse signals of phase b and c, only phase c, phase c and d, etc. are supplied by changing the phases to which the pulse signal is supplied. By applying the pulse signals in this way, the rotor 141 rotates through 45 ° in each case.

When such a stepping motor 14 is used as a drive source of a display pointer in a pointer display device and it is desired to permanently hold the display pointers in a certain position, it is generally practice to continuously supply pulse signals to the excitation phase, which corresponds to the stop position. To z. B. to hold the rotor 141 permanently in the 225 ° position in the middle between phase c and phase d, pulse signals are permanently applied to phase c and phase d.

Because the pulse signals are continuously applied to the Holding the pointer in the stop position points to the top described generally applied configuration the disadvantage on that the electricity consumption goes up.

To solve this problem, there is a conventional one Pointer display device available that a has a current-reducing agent which is currently connected to the Stepper motor supplied current is reduced when the The pointer does not move.

The device z. B. that in Japanese Publication 58-100 752 (from now on as the first conventional device) has one Stepper motor that is designed to even hold its position maintains when not powered; one Control circuit that according to the input information generates a signal pulse; a distribution circuit that the Signal pulses selected on each phase of the stepper motor distributed; and a timer circuit that receives the signals distributed by the distribution circuit to the stepper motor be monitored and the, if that of that  Distribution circuit for the stepper motor distributed signal for a certain amount of time remains at the value "1" (ON) and does not change to the value "0" (OFF), the signal is mandatory turns off.

That is when the signal is delivered to the stepper motor will not, within a predetermined period of time changes, this first conventional device performs the Electricity reduction process by stopping the delivery of the Pulse signal to the stepper motor, so that this of the Power supply is disconnected.

A device disclosed in Japanese Patent Application Laid-Open 61-124298 (or second conventional device) has a distribution circuit consisting of a Driver command signal a phase excitation signal for exciting the Coil of each phase is generated and connected to the coil of each phase of the Stepper motor corresponding to the phase excitation signal Applies signal; a detection circuit covering a period of time between a driver command signal leading to a particular one Time is entered, and a subsequent one Command signal measures, and that when the period is one exceeds a predetermined period of time, a signal for the duration generated that exceeds the predetermined time; and a Switching means that a switch-on control on the Phase excitation signal during the period in which the detection circuit generates the signal.

In other words, when the signal is sent to the stepper motor is not delivered for a predetermined period of time changes, the second conventional device introduces one current-reducing operation, with the average of the Excitation current is reduced by means of the switch-on control, which is executed for the pulse signal to the stepper motor.

Both in the first and the second conventional Device, the current reduction operation under the Condition executed that the next driver signal during the  predetermined period of time after the start time at which the first driver signal had been delivered to the stepper motor, has not been delivered to the stepper motor. This means, neither the first nor the second conventional device pulls the arrival time of the driver signal and the Target position information contained in the driver signal is considered.

Because of the inability of the control circuit timer, i. H. the arrival time and the extent of the transfer of the next Driver signal (difference between the current predicted driver signal and the next one), these conventional devices cannot move smoothly of the display pointer.

In particular, if the time at which the predetermined Time period for a specific driver signal ends with which Time coincides when the next driver signal the excitation signal is just beginning to be fed immediately after it was turned off again turned on, which is an unnecessary burden on the Exerts switching mechanism.

The object is achieved by the invention, a To create pointer display device that is uniform Movement of the display pointer realized and at the same time the current power consumption of the stepper motor is reduced.

According to the invention, the object is achieved in that the pointer display device adopts a structure shown in FIG. 1.

A hand display device with a display hand 11 and a correspondingly by that a predetermined target position of the pointer driven stepper motor 14 to position the display pointer at a location corresponding to the received number of steps, has according to the invention: a movement amount calculating means 21 b, which a moving amount θ of the display pointer 11 from calculates actual position information that represents the currently displayed position of the display pointer 11 and from target position information that represents the target position to which the display pointer is to be moved; and an energy saving operation executing means 21 a which, when the moving distance θ calculated with the moving amount calculating means 21 b is "0", supplies the stepping motor 14 with an energy saving operation driving signal which is set to a certain operating rate.

The pointer display device according to the present invention further includes a timer signal generating means 21 i that generates a signal defining the timing for calculating the amount of movement θ, and an operation period determining means 21 h that determines an energy saving operation period while based on a timing signal from the timer signal generating means 21 i which the energy saving operation execution means 21 a delivers the energy saving operation driving signal to the stepping motor 14 .

In addition, in the pointer display device according to the present invention, the energy saving operation executing means 21 a has a driving signal output period determining means 21 d which sets the output period of the energy saving operation driving signal as the energy saving operation period.

In this pointer display device, the energy saving operation executing means 21 a has a second drive signal output period determining means 21 e, which the output period of partial pulses - which is set in accordance with the period of the timing signal from the timing signal generating means 21 i and is set smaller than the operation period of the stepping motor 14 - than the period of the power saving operation driving signal during the energy saving operation period.

In this pointer display device, the power saving operation executing means 21 a includes: a clock period operating means 21 d which sets the power saving operation period as a period of the power saving operation driver signal; a sub-pulse period operation means 21 e which equates the sub-pulse period - which is set in accordance with the period of the timer signal from the timer signal generating means 21 i - with the period of the energy saving operation drive signal during the energy saving operation period; and an operation period selection means 21 c to which either the clock period operation means 21 d, or the part pulse period operation means selects 21 e.

In addition, in the pointer display device according to the invention, the second driver signal output period determining means 21 e has an operating rate determining means 21 f which determines the operating rate of the partial pulses.

In this pointer display device, the second drive signal output period determining means 21 e has an operating rate changing means 21 g which changes the operating rate of the partial pulses. The pointer display device of the present invention is also provided with a smoothing operation executing means 21 j which, when the amount of movement θ calculated by the amount of movement calculating means 21 b is different from "0", supplies the stepping motor 14 with the drive signal whose operating rate is progressively changed.

The movement amount calculating means 21b calculates the moving amount θ of the display pointer 11 from the actual position information, which is continuously supplied to the stepping motor, and the target position information to be supplied next. The energy saving operation executing means 21 a executes the energy saving operation only when the amount of movement θ calculated by the amount of movement calculating means 21 g is "0". That is, because the power saving operation is carried out after checking that there is no movement of the display pointer 11 , there is no possibility of an abrupt movement of the display pointer 11 caused by the next drive signal that suddenly comes in.

In addition, because the period during which the energy saving operation is carried out is defined by the generation period of the timer signal sent from the clock means 21 i which determines the timing for calculating the amount of movement θ, the calculation for the energy saving operation is minimized, resulting in a faster process.

In addition, because the period of the energy saving operation drive signal is designed to match the duration of the energy saving operation, that is, the generation period of the timer signal sent from the clock means 21 i, the calculation required to perform the energy saving operation can be minimized , increasing the speed of the process.

Furthermore, the period of the energy saving operation drive signal is set equal to the period of the sub-pulses, two or more of which are set during the operation period defined by the timer signal sent from the clock means 21 i. In other words, the energy-saving operation is carried out by means of short partial pulses, so that the display pointer 11 can be regulated in a more stable state during the energy-saving operation.

In addition, because the period of the power saving operation drive signal is made selectable between the generation period of the timing signal sent from the clock means 21 i and the sub-pulse period, a control can be selected which is adapted to the device characteristic.

In addition, because the partial pulses have a constant operating rate have, the processing of the calculations simplified the processing speed is increased.

The operating rate of the partial pulses is changed, whereby it is made possible immediately after the energy saving operation is carried out to create long partial pulses, the On time is long, and the on time of the following Reduce partial pulses progressively. This allows the Regulate display pointers more stably.

If the movement amount θ, which is calculated b by the movement amount calculating means 21 is different from "0", the uniforming operation of the display pointer 11 is selected so that a driving signal is supplied to the stepping motor 14, the operating rate is changed progressively, whereby the movement of The display pointer 11 is made uniform and a power saving operation similar to that performed when the display pointer 11 is at a standstill is performed.

Fig. 1 is a block diagram showing the basic structure of the pointer display device according to the invention;

Figs. 2A and 2B are schematic diagrams showing the configuration of an embodiment of the invention;

Fig. 3 is a flowchart showing the process of the smoothing operation of the display pointer 11 ;

Fig. 4 is a flowchart showing the flow of the energy saving operation;

Fig. 5 is a flowchart showing the flow of the energy saving operation;

Fig. 6A to 6E are schematic diagrams according to show the operation of the display pointer 11, and the drive signals at the pointer display device of an embodiment of the invention; and

FIGS. 7A and 7B are schematic diagrams showing the configuration of the stepping motor 14 and the driving signals.

An embodiment of the invention will now be described with reference to the drawings. Fig. 2 shows the construction of the hand display device according to the embodiment of the invention. As an example of the pointer display device, a speedometer is considered here, which displays the speed information that is picked up by sensors with a display pointer.

The pointer display device shown in FIG. 2A has an output unit 1 and a control unit 2 .

The output unit 1 has a display pointer 11 , a coding device 12 which, when it rotates with the display pointer 11 , generates a signal which corresponds to the displayed position of the display pointer 11 , a scale 13 which is provided with speed information, that of the displayed position of the pointer 11 and a stepper motor 14 which drives the pointer in accordance with the drive signal from a driver 147 .

The display pointer 11 is mounted on a shaft 121 at its center of rotation and is pivoted with the shaft 121 into a specific display position in accordance with the information that is to be output.

The coding device 12 is also mounted on the shaft 121 so that it is rotated with the display pointer 11 . The output of the coding device 12 is input to a processor unit CPU 21 of the control unit 2 via a coding device interface I / O 122.

The shaft 121 is provided with a gearwheel 111 on the indicator pointer side as a rotation transmission means, which is coupled via a reduction gear 112 to a motor-side gearwheel 146 which is mounted on a rotation shaft 143 of the stepping motor 14 .

The stepper motor 14 is controlled via step signals and the driver 147 sends the stepper motor 14 a driver signal which corresponds to the step signal. The stepper motor 14 has a counter 148 to count the number of steps. The content of this counter 148 is retrieved from the processor unit CPU 21 of the control unit 2 , which will be described later.

In the example arrangement, the stepper motor 14 is rotated by the drive signal from the driver 147 , and its rotation is transmitted to the motor side gear 146 , the reduction gear 112, and the display pointer side gear 111 where it is reduced, and then further transmitted to the shaft 121 , whereby the Display pointer 11 is brought into a specified angular position, which corresponds to the vehicle speed.

The control unit 2 has a processor unit CPU 21 as the central processor unit, a read memory ROM 22 which stores a control program for performing various processes, and a working memory unit RAM 23 for keeping data which are used for processing by the processor unit CPU 21 .

The processor unit CPU 21 receives a timing signal from a timer 3 as timing signal generating means and a pulse signal PS from a travel sensor (not shown) via a travel sensor interface I / O 5. The timer 3 transmits TP (described later) for each driver pulse period, in the RAM unit RAM 23 is stored, a timer signal to the processor unit CPU 21 . Upon receiving this timer signal, the processor unit CPU 21 executes the process.

The processor unit CPU 21 has a counter unit 4 which counts the counting information which is required for the execution.

The working memory unit RAM 23 has numerous designated areas, including an area θP for storing the number of steps of the stepping motor 14 in the currently displayed position of the display pointer 11 as actual position information DθP, ie the counter value of the counter 148 ; an area θM for storing the number of steps of the stepping motor 14 in the target position to which the display pointer 11 is to be moved as the target position information DθM calculated from the pulse signal PS from the travel sensor; an area TP for storing the driver pulse period TP as a time interval with which the timer signal of the timer 3 is transmitted; an area M for storing a partial pulse number M; an area TS for storing a sub-pulse period TS calculated from the driver pulse period TP and the sub-pulse number M; and an area DA for storing operating rate information DDA defining the operating rate during the power saving operation.

An area M holds the number of partial pulses which has been preset by an operator, and the area DA holds the preset operating rate. The content stored in the area TP is the calculated value which corresponds to the extent by which the display pointer 11 is to be moved. When the display pointer 11 is at a standstill, the area TP is given a predetermined time t1, which is also preset as a time which can be selected by an operator. The contents of the area θP and the area θM are renewed at predetermined time intervals.

The counter unit 4 has an area TP to count the driving pulse period TP, an area TS to count the sub-pulse period TS, an area TD to count the control time TD determined by the operation rate information TDA, and an area M, to count the number of partial pulses M already output.

Referring to FIGS. 3 and 5, the operation of the pointer display device will now be described according to this embodiment.

As shown in Fig. 3, the processor unit CPU 21 retrieves the target position information DθM stored in the area θM and the actual position position information DθP stored in the area P in step S310 and calculates the amount of movement θ of the Display pointer 11 from the difference between the two positions, ie incremental. Step S310 is performed when the timer 3 sends a timer signal to the processor unit CPU 21 .

Next in step S320, it is checked whether or not the amount of movement θ calculated in step S310 is "0". When it is determined that the amount of movement θ is "0", that is, it is determined that there is no movement of the display pointer 11 , the power saving operation is selected. If the amount of movement θ is not 0, that is, it is determined that there is movement of the display pointer 11 , the smoothing operation is selected to move the display pointer 11 smoothly.

If the power saving operation is selected, the flow goes to step S410 (see FIG. 4). If the equalization operation is selected, the flow goes to step S331.

The energy saving operation will first be described with reference to FIG. 4. In step S410, the predetermined time t1 is set in the area TP of the working memory RAM 23 . Then, in step S420, the period of the power saving operation drive signal is checked. In this step S420, it is checked whether the operation period selected by the operator is the predetermined time t1 or the sub-pulse period. M such partial pulses are set in this predetermined time t1.

If the predetermined time t1 is set as the energy saving operation period, the energy saving operation can be performed with fewer steps and therefore at a higher speed. If the sub-pulse period is set as the energy saving operation period, the movement of the display pointer 11 during the energy saving operation can be made more stable because the control period is short.

If the predetermined time period t1 as Energy saving operation period is used, the Flow to step S431 and if the sub-pulse period is used at step S441. It will now be the first Operation flow described when the predetermined time t1 as Energy saving operation period is set.

In step S431, the partial pulse period TS is set equal to the predetermined time t1. That is, in this step, the processor unit CPU 21 copies the content (predetermined time t1) of the area TP to the area TS.

It is then checked in step S432 to which excitation phase of the stepping motor 14 the driver signal is to be supplied. Because the indicator pointer 11 does not move during the energy saving operation, the excitation phase to which the drive signal must be supplied does not change. Therefore, the excitation phase of the previous state is read in step S432.

Thereafter, the flow goes to step S433, where the counter value corresponding to the value stored in the area TS of the RAM is set in the area TS of the counter unit 4 . That is, in step S433, the counter value corresponding to the predetermined time t1 is written in the area TS.

At the following step S434, the following calculation carried out:

TD = TS × DA (1)

to calculate the control time TD. This time TD is then written in the area TD of the counter unit 4 .

Thereafter, the process proceeds to step S435, where the processor unit CPU 21 supplies an ON signal "1" to the stepping motor 14 via the driver 147 . At the same time, the counter unit 4 starts counting down the area TD and the area TS.

In the next step S436 it is checked whether the counter value in the area TD of the counter unit 4 has reached "0". If the counter value has not yet reached zero, the process goes back to step S435, where it continues to supply an ON signal to the stepper motor 14 . If it is determined that the value has reached "0", the flow stops supplying an ON signal to the stepping motor 14 before proceeding to step S437.

That is, steps S435 and S436 supply the ON signal to the stepper motor 14 for the entire duration of the control time TD.

In step S437, the processor unit CPU 21 sends an OFF signal "0" to the stepping motor 14 . In the next step S436 it is checked whether the counter value in the area TS of the counting unit 4 has reached "0". If the value has not yet reached zero, the process returns to S437, where the OFF signal continues to be supplied to the stepper motor 14 . When it is determined that the counter value has reached zero, the supply of the OFF signal to the stepping motor 14 is stopped and the process is ended.

That is, in steps S437 and S438, the OFF signal delivered to the stepper motor for a period of time that the Sub-pulse period TS minus the control time TD corresponds.

Then, in step S437, the power saving operation associated with the  Period of the predetermined time t1 is ended, and the flow returns to step S310.

In steps S431 to S438 described above, the drive signals supplied to the stepping motor 14 have the shape shown in FIG. 6B. That is, the drive pulse period TP, which is defined as a predetermined time t1, is set equal to the sub-pulse periods TS. In this period, the driver signal becomes a pulse signal which is in the "on" state for the duration of the control time TD, which is determined by the operating rate DA, and "0" in the off state for the remaining period.

In other words, steps S431 to S438 carry out the operational control for the signal that is supplied to the stepping motor 14 at intervals of the predetermined time t1.

Next, the workflow will be explained if the partial pulse period is in step S420 as Energy saving operation period is selected. In this case goes if the partial pulse period as Energy saving operation period is selected in S420 which Flow to step S441, in which the following calculation for Determining the partial pulse period TS is carried out.

TS = TP / M (2)

where M is a number of partial pulses.

The partial pulse period TS determined in this way is written into the area TS of the RAM 23 .

Next, the process goes to step S442, where the excitation phase of the stepping motor 14 to which the drive signal is sent is determined. In step S442, the same operation is carried out as in step S432, ie the excitation phase in the previous status is read in.

Then, the flow goes to step S443, where the content [M] of the area M of the counting unit 4 is reset to "0" before the flow goes to step S510 ( Fig. 5).

It should be noted that the square brackets [] are used to distinguish the contents of the area M of the RAM 23 from the contents of the area M of the counter unit 4 . The brackets [] indicate the content of the area M of the counter unit 4 . In the following description, the content [M] of the area M of the counter unit 4 is provided with brackets []. In step S510, the control mode is selected in the event that the partial pulse period TS is set as the operating period. That is, in this step S510, either a mode in which the operating rate of the partial pulses is progressively reduced (variable partial pulse delivery mode) or a mode in which the operating rate of the partial pulses is set to a constant rate (fixed partial pulse delivery mode) is selected.

If the former, i.e. the variable partial pulse delivery mode is selected, the flow advances to step S521. If the the latter, the fixed partial pulse delivery mode is selected, goes the process proceeds to step S531. It should now be the first variable partial pulse delivery mode are explained.

In step S521, the area M of the counter unit 4 is incremented, ie the content of the area M of the counter unit 4 is changed by +1. If e.g. B. this area M has already been deleted to zero in step S443, the content assumes the value "1" in this step S521. The process proceeds to step S522.

In step S522, the counter value corresponding to the value of the partial pulse period TS calculated in step S441 is written on the area TS of the counter unit 4 . That is, in step S522, the counter value in the area TS of the counter unit 4 is set in accordance with TP / M.

Then the flow goes to step S523, where the following calculation  is carried out to determine the control time TD:

TD = (TS / M) × [M] (3)

where M is a number of partial pulses and [M] is the content of the area M of the counter unit 4 . The control time TD thus obtained is written in the area TD of the counter unit 4 .

Next, the process goes to step S524, in which an OFF signal "0" is output to the stepping motor 14 . At the same time, the counter unit 4 begins to count down the counter values stored in the areas TD and TS.

Thereafter, the flow advances to step S525, where it is checked whether the counter value in the area TD of the counter unit 4 has reached "0". If the value has not reached "0", the process goes back to step S524, where the OFF signal continues to be supplied to the stepping motor 14 . When the value reaches "0", the flow stops supplying the OFF signal to the stepping motor 14 before proceeding to step S526.

That is, in steps S524 and S525, the OFF signal is supplied to the stepping motor 14 for the duration of the control time TD.

The process then goes to step S526, where it is checked whether the content [M] of the area M of the counter unit 4 is equal to the number of sub-pulses M stored in the area M of the RAM 23 , that is, whether the specified number M of Partial pulses have been issued.

When the specified number of partial pulses has been output, d. H. [M] = M, the variable partial pulse delivery mode is ended and the flow returns to step S310. If the Counter value [M] has not yet reached the number of partial pulses M, The flow goes to step S527, where with the variable Partial pulse delivery mode is continued.

In step S527, the ON signal "1" is supplied to the stepping motor 14 . In the next step S528 it is checked whether the counter value of the area TS of the counter unit 4 has reached "0". If the counter value has not yet reached zero, the process returns to step S527, where the ON signal continues to be supplied to the stepper motor 14 . If it has reached "0", the flow goes to step S521.

In steps S527 and S528, the ON signal is sent to the Stepper motor for the entire duration of the partial pulse period TS minus the control time TD delivered.

Then, the flow goes to step S521, where the above-mentioned Sequence of operations is completely performed again to the to deliver the next partial pulse.

When steps S441 to S428 are performed, the drive signal supplied to the stepping motor 14 is formed as shown in FIG. 6D. That is, the drive pulse period TP is divided into M parts and each part is used as a partial pulse period TS, the pulse signal in this partial pulse period during the duration of the control time TD, which increases progressively, in the configured state "0" and during the remaining portion of the partial pulse period is "1" when switched on.

At the same time that the drive signal - which has 3 M partial pulses in the signal transmission interval (predetermined time t1) of the timer means - is supplied to the stepping motor 14 , the control for progressively reducing the switched-on time of the partial pulses that are supplied is carried out .

In this workflow, in which the partial pulse period is selected as the energy saving operation period and the variable partial pulse delivery mode is selected as the control mode, it is possible to provide a lower limit for the partial pulse operating rate and to provide the control in such a way that the switched-on duration of the partial pulses does not fall below the lower limit as shown in Fig. 6E.

To achieve this control, it is necessary to have one Comparison process and a replacement process after the step S523 to be provided. In the comparison process, the ON time based on the control time TD in step S523 is calculated, and the lower limit for the ON time on the Base of control time TD 'compared; and with that The replacement time is the control time TD Control time TD 'replaced when in the comparison process it is decided that the ON time is based on the Control time TD is shorter than the ON time based on the Control time TD ′.

The operation that is performed when the fixed partial pulse delivery mode is selected in step S510. If this mode is selected, the procedure goes from step S510 at step S531.

In this step S531, as in step S521, the counter value in the area M of the counter unit 4 is counted up and its counter value is transferred to step S532.

In this step S532, the counter value corresponding to the value of the partial pulse period TS calculated in step S441 is written into the area TS of the counter unit 4 , as in step S522.

Then, the flow goes to step S533, which performs the following calculation to determine the control time TD and writes it in the area TD of the counter unit 4 :

TD = TS × DA (4)

After that, the flow goes to step S534. In this step S534 and the subsequent step S535, the same procedure is carried out as in steps S524 and S525. That is, these steps S534 and S535 supply the ON signal "1" to the stepping motor 14 during the duration of the control time TD. The program then goes to step S536, which performs operations similar to those of step S526 to check whether the preset number M of sub-pulses has been output.

If it is determined that the preset number of If partial pulses have been output, the program ends the fixed partial pulse delivery mode and returns to step S310 back. If the counter value [M] does not equal the number of partial pulses M the program goes to step S537 where it continue with the fixed partial pulse delivery mode.

In step S537 and subsequent step S538, the OFF signal "0" is supplied to the stepper motor 14 . That is, the OFF signal "0" is supplied to the stepping motor 14 for the remaining period of the sub-pulse period TS minus the control time TD.

After that, the program goes to step S531, where again completely the sequence of operations described above is performed to deliver the next sub-pulse.

When performing steps S441 to S538, the drive signal supplied to the stepper motor 14 is designed as shown in FIG. 6C. That is, if the driver pulse period TD is divided into M parts and each of these parts is used as the partial pulse period TS, the pulse signal in this partial pulse period is in the switched-on status "1" for the duration of the control time TD, which is defined with a constant operating rate DA. and during the remaining time of the partial pulse period in the switched-off status "0".

In other words, in steps S441 to S528, a drive signal having M partial pulses with a fixed operating rate is supplied to the stepping motor 14 during the signal transmission interval of the timer unit 3 (predetermined time t1).

If in step S320 (see Fig. 4) determined that the moving amount θ is not equal to "0", ie, if it is determined that a movement of the display pointer 11 is present, the smoothing operation is selected and the program proceeds to step S333. The smoothing operation will now be described below.

In step S 331, the following calculation is performed to determine the driver pulse period TD, and it is stored in the area TP of the RAM 23 .

TD = | KA / θ | + KC (5)

where KA and KC are constants.

Thereafter, in this step, the calculation shown below is performed to determine the partial pulse period TS, and this is stored in the area TS of the RAM 23 .

TS = TP / M (6)

The program then goes to step S332.

In step S332, the phase of the stepper motor 14 to which the drive signal is fed is determined. In this smoothing operation, the display pointer 11 moves so that the phase to which the drive signal is currently being supplied differs from the phase to which the next drive signal is being supplied.

If e.g. B. the amount of movement θ that in step S320 has been calculated, is positive, moves Stepper motor clockwise. The following is a case described in which the stepper motor from the current 90 ° state is moved to the 135 ° position.

In this case, as shown in FIG. 7B, the state of the individual excitation phases at 90 ° is "0" in phase a, "1" in phase b, "0" in phase c and "0" in phase d. To move the stepper motor to the 135 ° position, it is necessary that the excitation phases are "0" in phase a, "1" in phase b, "1" in phase c and "0" in phase d.

In this way, the phase to which the driver signal is to be sent is determined in step S332 on the basis of the current state and the direction of rotation of the stepping motor 14 .

Next, the program goes to step S333, where the content [M] of the area M of the counter unit 4 is set to zero as in step S443 (see FIG. 4) before the flow jumps to step S340.

In step S340, the content [M] of the area M of the counter unit 4 is adjusted by +1. This operation is performed to count the number of sub-pulses already output, as was done in the above-mentioned energy saving operation in the sub-pulse period.

The program then goes to step S350, where the counter value corresponding to the partial pulse period TS, which was calculated in step S331, is written into the area TS of the counter unit 4 and the calculation given below is carried out in order to determine the control time TD.

TD = (TS / M) × [M] (7)

Then, in step S331, the counter value corresponding to the control time TD thus obtained is written on the area TD of the counter unit 4 .

After setting the counter values in the areas TS and TD of the counter unit 4 , the program goes to step S360.

In step S360, the phase of the stepper motor 14 to which the drive signal is to be supplied is checked, as determined in step S332, to see whether the relevant phase changes from "1" to "0" at the beginning of the period or from "0""to" 1 ".

If it is determined that the phase changes from "1" to "0" changes, the program goes to step S371. If it is determined that the phase changes from "0" to "1"  the program at step S381.

In step S371, the OFF signal "0" is supplied to the stepper motor for the duration of the control time TD. This process is similar to that of steps S524 and S525, ie the OFF signal "0" continues to be supplied to the stepper motor 14 until the counter value of the area TD of the counter unit 4 reaches zero.

Thereafter, the program goes to step S372, where it is checked whether the content [M] of the area M of the counter unit 4 is equal to the number of sub-pulses M stored in the area M of the work storage unit 43 , that is, whether the predetermined number of Partial pulses M has been output.

If it is determined that the predetermined number of partial pulses the program ends the Equalization operation and returns to step S310. If the counter value [M] has not yet reached the number of partial pulses M has reached, the program goes to step S373.

In step S373, an ON signal "1" is supplied to the stepping motor 14 during the remaining time of the partial pulse period, that is to say during the duration of the partial pulse period TS minus the control time TD. This process is similar to that of steps S527 and S528, ie it continues to deliver the ON signal "1" to the stepper motor 14 until the counter value in the area TS of the counter unit 4 reaches "0".

After step S373 is finished, the program goes to Step S340 to send the next sub-pulse.

If it is determined in step S360 that the one in question Phase changes from "0" to "1" and the program to In step S381, the following procedure is performed.

In step S381, an ON signal "1" is supplied to the stepper motor 14 during the duration of the control time TD. This process is carried out in the same manner as in step S371, with an ON signal "1" being supplied to the stepper motor 14 until the counter value in the area TD of the counter unit 4 reaches zero.

After that, the program goes to step S381, where it is checked whether the predetermined number of sub-pulses M have been output is. If it is determined that the predetermined number of If partial pulses have been output, the program ends the Equalization operation and returns to step S310. If the counter value [M] is not yet the number of partial pulses M has reached, the program goes to step S383.

In step S383, an OFF signal "0" is supplied to the stepping motor 14 during the remaining time of the partial pulse period, that is to say during the duration of the partial pulse period TD minus the control time TD. This process is performed in a manner similar to that of step S373, wherein an OFF signal "0" is supplied to the stepping motor 14 until the counter value in the area TS reaches the counter unit 4 "0".

After step S383 is finished, the program goes on Step S340 to send the next sub-pulse.

In the above series of operations performed in steps S332 to S383, when the signal of the phase of interest changes from "1" to "0" at the beginning of the period, one of sub-pulses whose ON time progressively decreases , Existing driver signal supplied to the stepper motor 14 . When the signal of the phase of interest changes from "0" to "1" at the beginning of the period, a drive signal is supplied to the stepping motor 14 , which consists of partial pulses whose ON time increases progressively.

In summary, we have the crucial element of this invention and the operational steps of the flow chart are as follows Relationship to each other.

The saving operation executing means 21 a corresponds to the steps S410 to S443 and the steps S510 to S538, and the movement amount calculation means 21 b corresponds to the steps S310 and S320.

The operation period selection means 21c corresponds to the step S420, the Treibersignalausgabeperiodedefiniermittel 21 d the steps S431 to S438 and the second driving signal output determination means 21 e corresponds to the steps S441 to S443 and steps S510 to S538.

The operating rate determination means 21 f corresponds to steps S531 to S538 and the changing means works 21g corresponds to steps S521 to S528.

The operation period determination means 21 h corresponds to the font S410 and the smoothing operation execution means 21 j corresponds to the steps S331 to S383.

The relationship between the Extent of movement and the driver signal explained to the Stepper motor in the pointer recording unit of this Embodiment with the above means to the Stepper motor is sent.

In Fig. 6A, the extent of the step movement is plotted on the ordinate and the time on the abscissa. The courses, which are labeled phase a to phase d, go again pulse signals (drive signals), which are shown in Fig. 7B and which are supplied to the excitation phases of the stepper motor 14 . Designated by P1 to P8 are timing signals which are output by the timer 3 .

In the figure, the period between P1 and P7 represents the state in which the display pointer is moving and the smoothing operation is performed, and the period between P7 and P8 is the state in which the display pointer 11 is not moving and the energy saving operation is carried out.

In the period between P0 and P1, a pulse signal is applied to the excitation phase d, and partial pulse signals are applied to the excitation phase a, the operating rate of which increases progressively, that is, in this P0-P1 period, a control is carried out so that the rotor 141 ( FIG. 7A), which was positioned at the time P0 at 270 °, at the time P1 on the 315 ° - position is rotated.

In the subsequent period between P1 and P2, d partial pulse signals are applied to the excitation phase, the operating rate of which decreases progressively. In this P1-P2 period, the rotor 141 , which had been in the 315 ° position at time P1, is rotated to 0 ° at time P2.

In this way, corresponding to the excitation phases Driver signals are delivered and at time P7 the phase c and d powered, d. H. the pointer is in the 225 ° position rotated.

In the P7-P8 period, it is determined that there is no movement of the display pointer 11 , and therefore the power saving operation is performed.

Here is a partial pulse period as energy saving operating period selected, with partial pulses with a fixed Operating rate are generated.

In this way, according to the invention, by combining the power saving operation with the smoothing operation, it is possible to reduce the current power consumption by performing the smoothing operation when the display pointer 11 is moving and performing the power saving operation when the display pointer 11 is not moving. The combination of these two types of operations helps to further reduce the current consumption of the stepper motor 14 .

As described above is in an inventive  Display pointer device comprising a display pointer and a Stepper motor for positioning the display pointer in a Position that is the number of step signals corresponds to which are received and the stepper motor according to the displayed position of the pointer drive, a range of motion calculation means and a Energy saving operation execution means provided. The Movement amount calculation means calculates the movement amount the display pointer from the actual position information that the shows the currently displayed position of the display pointer, and the target position information reflecting the target position, into which the display pointer is to be moved. The Energy saving operation execution means delivers to the Stepper motor an energy saving operation drive signal which one predetermined operating rate is adjusted if that Amount of movement by the amount of movement calculation means is calculated is "0". With this arrangement, that calculates Movement amount calculation means the movement amount of the Display pointer from the current position information, which is currently being delivered to the stepper motor, and from which Target position information to be delivered next should, and the energy saving operation execution means leads the energy saving operation only if that Amount of movement by the amount of movement calculation means is calculated is "0". Because the energy saving operation is carried out after ensuring that none There is movement of the indicator pointer, it is possible to to avoid abrupt movement of the pointer that may occur could, if the next driver signal is received immediately.

The pointer display device according to the invention is also included a timer signal generating means which provides a signal generates the timing of computing the Determined range of motion, and with one Operation period determination means that the Energy saving operation period defined during which the Energy saving operation means that Deliver the energy saving operation drive signal to the stepper motor.  

The period of time during which the energy saving operation is defined by the generation period of the timing signal output by a clock means which is provided to calculate the timing to determine the extent of movement. This structure reduces the Calculations performed during the energy saving operation be, whereby the speed of the process is increased.

In addition, in this pointer display device Energy saving operation execution means Driver signal output period determining means that the Energy saving operation period as the issue period of Energy saving operation driver signal times. Because the period of the power saving operation drive signal is equal to that Energy saving operation period is set, d. H. of the Generation period of the timing signal by da Clock means generated can be the extent of the calculation that is required for the energy saving operation the speed of the process is increased.

Furthermore, in this pointer display device Energy saving operation execution means a second Driver signal output determining means that the output period of partial pulses - which correspond to the period of the Timing signal from the timing signal generating means is set and is also set smaller than that Operation time of the stepper motor - as a period of Energy saving operation driver signal during the Energy saving operation period times. Because the period of the Power saving operation drive signal equal to the period of one short partial pulse is set, the M times in one Operation interval is generated by the timer signal is defined by the clock means, the display pointer can during the energy saving operation can be controlled more stably.

Furthermore, in this pointer display device, the Energy saving operation execution means on: a Driver signal output determining means that the  Energy saving operation period as the issue period of Power saving operation driver signal sets; a second Driver signal output determining means that the output period of partial pulses - which correspond to the period of the Timing signal set by the timing signal generating means becomes and also less than the operation time of the Stepper motor is set - as the period of Energy saving operation driver signal during the Energy saving operation period; and the Operative period selection means that either Clock period operation means or that Select sub-pulse operation means. Because the period of the Energy saving operation driver signal from the generation period the timer signal output from the clock means and the sub-pulse period is made selectable, it will allows you to select a scheme based on the characteristic the device is adapted.

In addition, this pointer display device has the second Driver signal output determining means Operating rate determining means that the operating rate of the Partial pulses defined. Because the partial pulse is fixed Operating rate is set, the calculation can be simplified what speeds up the process.

In addition, this display pointer device has the second Driver signal output determining means Operating rate changing means for changing the operating rate of the partial pulse.

Because the operating rate of the partial pulse can be changed, it is possible to deliver partial pulses whose On period immediately after the Energy saving operation has been carried out, is long, and later give out partial pulses, the switch-on duration increasing is reduced. This allows the display pointer to be in one far more stable condition is regulated.  

In addition, this pointer display device is with a Smoothing operation execution means provided that the stepper motor supplies the driver signal, its operating rate is progressively changed when the range of motion caused by the movement amount calculation means is calculated from zero is different. Because if the range of motion caused by the Movement amount calculation means is calculated from zero is different, the equalization operation of the Display pointer is selected so that the stepper motor Driver signal is supplied, its operating rate is progressive is changed, the movement of the display pointer be made even and the energy saving operation too be performed while the display pointer is being moved, such as when the pointer is at a standstill.

Claims (8)

1. Pointer display device comprising a display pointer and a stepper motor which puts the display pointer in a position which corresponds to the number of step signals which are received and which drives the stepper motor in coordination with the displayed position of the display pointer, the pointer display device comprising:
movement amount calculating means that calculates the amount of movement of the display pointer from an actual position information representing the currently displayed position of the display pointer and from a target position information representing the target position to which the display pointer is to be moved; and
an energy saving operation executing means that outputs to the stepping motor an energy saving operation driving signal adapted to a predetermined operation rate when the amount of movement calculated by the amount of movement calculation means is zero.
2. The pointer display device according to claim 1, comprising:
timing signal generating means that generates a signal that determines the timing of calculating the amount of movement θ; and
an operation period determining means that, based on the timing signal from the timing signal generating means, determines an energy saving operation period during which the energy saving operation executing means supplies the energy saving operation drive signals to the stepping motor.
3. pointer display device according to claim 2, wherein the Energy saving operation execution means Driver signal output determining means which the Energy saving operation period as the issue period of Energy saving operation driver signal sets.
4. pointer display device according to claim 2, wherein the  Energy saving execution means a second Driver signal output determining means which the Output period of partial pulses as the period of Energy saving operation driver signal during the Energy saving operation sets, the sub-pulse output period corresponding to the period of the timing signal from the Timing signal generating means is set and also is set shorter than the operating time of the stepper motor.
5. The pointer display device according to claim 2, wherein the Energy saving operation execution means Driver signal determining means having the Energy saving operation period as the issue period of Power saving operation driver signal sets; a second Driver signal output determining means that the output period of partial pulses as the period of the Energy saving operation driver signal during the Energy saving operation sets, the sub-pulse output period corresponding to the period of the timing signal from the Timing signal generation unit is set and also is set shorter than the operation time of the stepper motor; and an operation period selection means that either Clock period operation means or that Select sub-pulse period surgical equipment.
6. pointer display device according to claim 4 or 5, wherein the second driver signal output determining means Operating rate definition means that the operating rate of Partial pulses defined.
7. The pointer display device of claim 6, wherein the second Driver signal output determining means Works rate change means that the operating rate of Partial pulses changed.
8. pointer display device according to one of claims 1 to 7, which has a smoothing operation executing means, which delivers the driver signal to the stepper motor  Operating rate is progressively changed when that Amount of movement by the amount of movement calculation means is calculated is different from zero.
DE1996108480 1995-03-06 1996-03-05 Display device Expired - Lifetime DE19608480B4 (en)

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JP4524295A JPH08240445A (en) 1995-03-06 1995-03-06 Needle type display device

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