JP3764708B2 - Stepper motor type indicator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stepper motor type indicating instrument, and in particular, a stepper motor type capable of efficiently resetting an indication error caused by a step-out of a pointer driving stepper motor provided in a vehicle indicating device in a short time. It relates to indicating instruments.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a vehicle instruction device using a stepper motor has a configuration shown in FIG. In the figure, this pointing device includes a stepper motor 1, a pointer 2 driven by the stepper motor 1, and a stepper motor drive device 3 that controls the rotation of the stepper motor 1 (hereinafter simply referred to as a drive device 3). .). The stepper motor 1 described above includes two excitation coils 1a1 and 1a2, NS poles alternately magnetized in three poles, a rotor 1b that rotates following the change in the excitation state of the excitation coils 1a1 and 1a2, and a rotation A gear 1c that transmits the driving force of the child 1b to the pointer 2 is provided.
[0003]
Further, the stepper motor 1 is provided on the back side of the gear 1c on the pointer 2 side, and a piece 1d as a driven member interlocked with the rotation operation of the rotor 1b, the exciting coils 1a1 and 1a2, the rotor 1b, and the gear 1c. And a stopper 1e that is provided in a housing case (not shown) that houses the piece 1d and mechanically stops the rotation of the rotor 1b by contact with the piece 1d. The rotation of the stepper motor 1 so that the piece 1d faces the stopper 1e is reverse rotation, and the rotation direction of the pointer 2 during reverse rotation is the reverse rotation direction Y1. On the other hand, rotating the stepper motor 1 so that the piece 1d is separated from the stopper 1e is forward rotation, and the rotation direction of the pointer 2 during forward rotation is the forward rotation direction Y2. The stopper 1e is provided so that the pointer 2 indicates the scale of the measured value 0 on the dial when it comes into contact with the piece 1d.
[0004]
The driving device 3 rotates the rotor 1b according to movement angle data (θ−θ ′) that is a difference between the current position θ ′ of the pointer 2 and the target position θ. As a result, the pointer 2 moves by the movement angle data (θ−θ ′) to indicate the target position θ. The target position θ is updated every time measurement angle data θi calculated based on measurement values measured by various sensors is input. The measurement angle data θi is data that increases as the measurement value increases when the initial position 0 ° is calculated when the measurement value is zero.
[0005]
By the way, the pointing device described above is the movement angle data (θ−θ ′) that the pointer 2 should move and the actual movement amount due to the input of the measurement angle data θi on which the vibration or noise of the vehicle is superimposed. Sometimes caused a different step-out. If this step-out is repeated, an error occurs between the measured value indicated by the pointer 2 and the measured value measured by the various sensors, and the pointing device cannot give an accurate instruction.
[0006]
Therefore, the driving device 3 performs an initialization operation every time the power is turned on. In this initialization operation, the driving device 3 reversely rotates the stepper motor 1 so that the piece 1d faces the stopper 1e side. As a result of the reverse rotation, when it is determined that the piece 1d comes into contact with the stopper 1e and the pointer 2 has reached the initial position on the dial of the measured value 0, the driving device 3 causes the stepper motor 1 to rotate. Stops electrically.
[0007]
The method for determining that the stepper motor has reached the initial position is, for example, a method for determining based on the presence or absence of an induced voltage generated using a detection coil, or a mechanical switch or an optical sensor. Alternatively, there are a method of turning off, a method of using an encoder, and a method of determining that the initial position should have been reached by reverse rotation by a certain angle. By using such a method, an error between the measurement value measured by each sensor and the value indicated by the pointer is reset.
[0008]
On the other hand, not only when the ignition switch is turned on, but also when the power is once turned on in response to the ignition switch being turned on, the engine is started, There is also a timing at which the battery voltage is restored and the power is turned on again from a state where the power-on is temporarily interrupted due to a drop in the battery voltage, which is sometimes called so-called cranking. Before the power supply to the driving device 3 is temporarily cut off due to the battery voltage drop due to such cranking, the pointer 2 used in the fuel gauge or the like may already indicate a somewhat large measured value. Many.
[0009]
Therefore, when the engine is started, power-on is temporarily cut off (also referred to as instantaneous power interruption), and when the power is turned on again, the initialization operation is performed, in addition to the error caused by the step-out. Before moving the pointer 2 in the reverse rotation direction Y1. Further, the pointer 2 is moved in the reverse rotation direction Y1 by the amount of movement that is the difference between the indicated position of the somewhat large measured value indicated by the pointer 2 and the initial position that is the indicated position of the measured value 0. Need to be rotated.
[0010]
However, an increase in the cost of the apparatus cannot be ignored by a method of turning on or off at the initial position using a mechanical switch or an optical sensor, or a method using an encoder. On the other hand, in the method using the detection coil, the cost increase can be suppressed by alternately switching the drive coil and the detection coil. However, in order to reliably detect the peak value of the induced voltage, the drive coil is excited. It is necessary to wait for the time for the rotor 1b to move to the excited position. For this reason, in the method using the detection coil, there is a problem that when the rotation speed is slow and the stepper motor is greatly stepped out, it takes time to recover. Further, even in the method of reverse rotation at a constant angle, if the speed is too fast, there is a problem that it may bounce off the stopper and the speed cannot be made too fast. As described above, various methods for determining that the initial position has been reached have a problem that it is costly or time consuming.
[0011]
In view of these problems, an instruction value immediately before a momentary interruption occurs in a RAM (hereinafter simply abbreviated as a microcomputer) included in the driving device 3, for example, the current position θ ′. Is stored, and after the power supply voltage is restored, the indicated value is output first, and then reverse rotation is performed at high speed normal operation from that point to the zero position. Can be shortened.
[0012]
[Problems to be solved by the invention]
However, in general, many stepper motors that decelerate a multi-pole magnet with a gear reduce the burden of microcomputer processing by making the drive part macro, and in this case, the current position θ in the RAM of the microcomputer There may be a difference between the position of the pointer actually passing through the macro part (stepper motor driving macro part 3b shown in FIG. 2). In other words, the microcomputer updates the moving angle data periodically (relatively at intervals of several tens of ms), but the macro part updates the moving angle data from the microcomputer quickly and finely to realize smooth micro-step driving. is doing. For this reason, even if the microcomputer outputs movement angle data corresponding to the measurement values from various sensors, a slight delay occurs until the pointer actually reaches its position.
[0013]
Therefore, when the pointer is descending toward the target angle, there is a slight difference between the current position θ ′ held by the microcomputer immediately before the momentary interruption and the actual position at which the pointer is pointing. Therefore, if this is not corrected, the zero position may not be reached even if the zero position return operation is performed. Also, if the pointer is moving up toward the target angle, for example, if a momentary interruption occurs when the movement angle data from the microcomputer is already being output even though the pointer has not yet moved from near zero, Even when the position return operation is performed, the pointer is reversed more than the actual instruction, and may hit the stopper and jump up.
[0014]
Therefore, in view of the above-described problems, the present invention has an object to provide a stepper motor type indicating instrument in which the pointer is surely returned to the initial position in a short time and the stopper contact confirmation operation is performed. .
[0015]
[Means for Solving the Problems]
The stepper motor type indicating instrument according to claim 1, which has been made to solve the above-mentioned problems, is shown in the basic configuration diagram of FIG. Through the macro part that performs processing to realize smooth micro-step drive, Stepper motor type indicating instrument that moves the pointer to the position of the pointer according to the measured quantity to be displayed by controlling the driving means Because An instruction position information storage means for storing pointer position information indicating the position of the pointer when power supply from the power source to the apparatus main body is stopped; and in response to activation of the apparatus main body, the activation instantaneously corresponds to the power Power supply interruption determining means for determining whether or not the restart is caused by the occurrence of an instantaneous power supply interruption, and the power supply interruption determining means determines that the activation is in response to the occurrence of the instantaneous power interruption. For the pointer position on the data indicated by the pointer position information stored in the pointer position information storage means, This is due to the time required for the processing related to the micro step drive in the macro section. Control means for controlling the drive means by adding a predetermined correction value based on the instruction delay angle, and controlled by the control means Based on the pointer position And stopper contact confirmation means for performing a stopper contact confirmation operation.
[0016]
According to the first aspect of the present invention, the pointer position information indicating the pointer position when the supply of power from the power source to the apparatus main body is stopped is stored in the indicated position information storage unit 3a3. Then, according to the activation of the apparatus main body, it is determined whether or not the activation is a restart due to the occurrence of an instantaneous power interruption in which power supply is instantaneously stopped, and it is determined that the activation corresponds to the occurrence of the instantaneous power interruption. If the pointer position on the data indicated by the pointer position information stored in the pointer position information storage means, Due to the time required for processing related to micro-step drive in the macro section The position of the pointer is controlled by adding a predetermined correction value based on the instruction delay angle. Then, starting from this position, the stopper contact confirmation operation is performed. Thus, with respect to the pointer position on the data indicated by the pointer position information stored in the pointer position information storage unit, Due to the time required for processing related to micro-step drive in the macro section Since the position of the pointer is controlled by adding the correction value, the pointer surely returns to the initial position in a short time, and the stopper contact confirmation operation is performed.
[0017]
The stepper motor type indicating instrument according to claim 2, which is made to solve the above-mentioned problem, is the pointer type measuring instrument according to claim 1, wherein the position of the pointer stored in the indicated position information storage unit 3 a 3 is greater than a predetermined position. When the position is close to the zero position, the stopper contact confirmation means 33 performs a stopper contact confirmation operation without performing the movement control of the pointer by the control means 32.
[0018]
According to the second aspect of the present invention, when the position of the pointer stored in the indicated position information storage unit 3a3 is closer to the zero position than the predetermined position, the stopper contact confirmation operation is performed directly, so that useless operation is performed. The stopper contact confirmation operation is completed in a short time.
[0019]
The stepper motor type indicating instrument according to claim 3, which has been made to solve the above-mentioned problem, is a pointer type measuring instrument according to claim 1, wherein the indicator determines whether the indicator is rising or falling toward a target angle. Based on the determination result, whether to add or subtract the correction value is determined.
[0020]
According to the invention described in claim 3, it is determined whether the pointer is rising or falling toward the target angle, and it is determined whether to add or subtract the correction value based on the determination result. Therefore, the pointer reliably returns to the initial position in a short time, and the stopper contact confirmation operation is performed.
[0021]
The stepper motor type indicating instrument according to claim 4, which has been made to solve the above-mentioned problem, is designed for the angle stored in the indicated position information storage means 3 a 3 in the pointer type measuring instrument according to claim 1. The maximum instruction delay angle that can be generated is used as the correction value.
[0022]
According to the fourth aspect of the invention, the maximum instruction delay angle that can be generated in design with respect to the angle stored in the instruction position information storage means 3a3 is set as the correction value. Thus, the initial position is surely returned in a shorter time, and the stopper contact confirmation operation is performed.
[0023]
The stepper motor type indicating instrument according to claim 5, which has been made to solve the above-mentioned problems, is an electric instrument for the pointer type measuring instrument according to claim 1, which is further electrically connected to the angle stored in the indicated position information storage means 3 a 3. An amount of angular movement corresponding to the target 1 or 2 cycles is added to correct the instruction delay.
[0024]
According to the fifth aspect of the present invention, the amount of movement of the angle corresponding to one or two electrical cycles is further added to the angle stored in the indicated position information storage means 3a3 to correct the indicated delay angle. Thus, an initial position return operation and a stopper contact confirmation operation that are more realistic are performed.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in FIG. 2, a schematic configuration of a stepper motor type indicating instrument according to an embodiment of the present invention will be described. FIG. 2 is a schematic configuration diagram showing a stepper motor type indicating instrument according to an embodiment of the present invention. This stepper motor type indicating instrument includes a stepper motor 1, a pointer 2, and a driving device 3 as described in the above-described conventional example. The stepper motor 1 also has exciting coils 1a1 and 1a2, a rotor 1b, a gear 1c, a piece 1d, and a stopper 1e as in the conventional example.
[0026]
Excitation coils 1 a 1 and 1 a 2 in the stepper motor 1 are connected to a driving device 3. In response to the supply of the excitation signal output from the driving device 3, the excitation states of the respective excitation coils 1a1 and 1a2 change, and the rotor 1b rotates. In the driving device 3 described above, for example, power-on from the in-vehicle battery is started at an ON timing of an ignition switch (not shown).
[0027]
The driving device 3 includes a microcomputer 3a and a stepper motor driving macro unit 3b. As is well known, the microcomputer 3a stores a CPU 3a1 that performs various controls in accordance with a predetermined program, a ROM 3a2 that is a read-only memory storing the program, and various data and performs processing operations of the CPU 3a1. It has a RAM 3a3 which is a readable / writable memory having a necessary area.
[0028]
In particular, the RAM 3a3 uses a DRAM that requires a data write (refresh) operation at regular intervals to hold data. Then, at the time of activation, based on the state of the checksum information stored in the predetermined area of the RAM 3a3, it is checked whether the power supply to the RAM 3a3 has been cut off for a predetermined time. That is, by this check, it is determined whether or not the data such as the current position θ ′ held in the RAM 3a3 is reliable. This is also used in the processing procedure of FIG.
[0029]
The stepper motor drive macro section 3b reduces the burden of microcomputer processing by converting the drive section of the drive device 3 into a macro. That is, the microcomputer 3a periodically updates the moving angle data (θ−θ ′) at a relatively slow interval of several tens of ms, but the macro unit 3b updates the moving angle data from the microcomputer finely at high speed. As a result, smooth micro-step driving is realized. However, although the macro part 3b has the above-mentioned advantages, the current position θ ′ in the RAM 3a3 may be different from the position actually pointed by the pointer through the macro part 3b. Even if the movement angle data corresponding to the measured value from is output, a slight delay may occur until the pointer actually reaches its position. This embodiment solves this problem.
[0030]
Next, the operation according to this embodiment of the stepper motor type indicating instrument having the above-described configuration will be described with reference to the flowchart of FIG. 3 and the graphs of FIGS. 4 and 5. FIG. 3 is a flowchart illustrating a processing procedure according to the present embodiment performed by the CPU 3a of the driving device 3. FIG. 4 is a graph showing the instruction responsiveness while the pointer of the stepper motor according to the present embodiment is descending. FIG. 5 is a graph showing the instruction responsiveness when the pointer of the stepper motor according to the present embodiment is rising.
[0031]
In step S1, when the CPU 3a1 of the apparatus 3 is activated or reset after the power is turned off, various CPU initial settings are performed accordingly. Next, in step S2, it is determined whether or not the contents of the RAM 3a3 are retained. This determination is made based on the state of checksum information stored in a predetermined area of the RAM 3a3. This determination makes it possible to determine whether or not an instantaneous power interruption has occurred. That is, in this step S2, it is determined whether or not this activation is a restart due to the occurrence of a momentary power interruption in which the supply of power is momentarily stopped, according to the activation of the device 3, and this step S2 is in the claims. This corresponds to the instantaneous power interruption determining means 31.
[0032]
The RAM 3a3 stores and holds pointer position information (the current position θ ′) indicating the pointer position when power supply to the device 3 from a battery (not shown) as a power source is stopped for a predetermined time. This RAM 3a3 corresponds to the indicated position information storage means 3a3 in the claims. If it is determined in step S2 that the contents of the RAM 3a3 are stored and held, it is determined that there is an instantaneous power interruption, and the process proceeds to step S3 (YES in step S2). Otherwise, it is determined that the power supply has been interrupted for a long time. Then, the process proceeds to step S2a (NO in step S2). Step S2a in the case where the power supply has been shut off for a long time will be described later.
[0033]
Next, in step S3, it is determined whether or not the current position θ ′ stored in the RAM 3a3 is greater than or equal to a predetermined angle α, that is, whether or not it is close to the zero position. If the current position θ ′ is greater than or equal to the predetermined angle α, the process proceeds to step S4 (YES in step S3), otherwise proceeds directly to step S6 described later (NO in step S3). In step S3, if the position of the pointer (current position θ ′) stored in the RAM 3a3 is closer to the zero position than the predetermined position (predetermined angle α), the movement of the pointer is not directly controlled and will be described later. This is equivalent to the description of claim 2. Note that the predetermined angle α is an angle at which the pointer comes into contact with the stopper when the pointer is reversely rotated by one or two electrical cycles, for example. The reversal of the pointer is specifically the reversal of the pointer accompanying the reverse rotation of the rotor 1b. However, in the following description, the reversal of the pointer is simply described as “reversal of the pointer”.
[0034]
In step S4, it is determined whether or not the ignition switch is on when the reset occurs in step S1. Information on the state of the ignition switch is stored in a part of the RAM 3a3. This step S4 is for determining whether the pointer is moving up or down toward the target angle. When the ignition switch is on, the pointer is moving up toward the target angle or has already reached the target angle. The process proceeds to step S5a to perform the corresponding processing (YES in step S4), otherwise the pointer is being lowered toward the target angle or has already reached the zero position. The process proceeds to step S4a in order to determine whether it is either or not and perform corresponding processing (NO in step S4).
[0035]
In step S5a and step S5b, the movement angle data is output by the amount corresponding to the current position θ ′ of the pointer stored in the RAM 3a3, and the pointer is reversed to the initial position. Here, when the pointer is reversed to the initial position, it is sufficient that the piece 1d is in contact with the stopper 1e. However, it is not always in contact with the stopper for the above reason. In order to confirm contact (meaning that the piece 1d comes into contact with the stopper 1e), the pointer is further reversed by one or two electrical cycles. This electrical cycle means one cycle of an excitation signal for rotating the rotor 1b (or pointer) of the stepper motor 1. The excitation signal is known, and this excitation signal is applied to the excitation coils 1a1 and 1a2, respectively, for example, sine and cosine wave signals each consisting of 8 steps.
[0036]
When the stopper contact confirmation is completed, an excitation signal corresponding to the measured angle data θi is output in step S7, and the angle corresponding to the measured angle data θi is changed by changing the excitation state of each excitation coil 1a1 and 1a2. Only the normal operation of rotating the pointer forward and backward is performed. By this normal operation, the pointer 2 indicates the measurement value measured by the sensor. Thereafter, when the power to the driving device 3 is turned off, the CPU 3a ends the normal operation and ends the process.
[0037]
On the other hand, in step S2a, which has been determined that there is a momentary disconnection in step S2, the pointer is reversed to the full-scale equivalent angle to the initial position, and then the process proceeds to step S6 to check the stopper contact. The target is further reversed by 1 to 2 cycles. If it is not determined in step S3 that the current position θ ′ stored in the RAM 3a3 is equal to or greater than the predetermined angle α, the process proceeds directly to step S6 to confirm stopper contact. The pointer is further reversed by one or two electrical cycles to measure the induced voltage.
[0038]
Further, in step S4a, which has proceeded without being determined that the ignition switch was on when the reset occurred in step S4, that is, either the pointer is being lowered toward the target angle or has already reached the zero position. In step S4a that has been determined to be, the angle data that was sent last, that is, the movement angle data output to the exciting coils 1a1 and 1a2 immediately before the power was turned off, moved the pointer to the initial position. Whether it is determined. If it is determined that the movement angle data is for moving the pointer to the initial position, the process proceeds to step S4b (YES in step S4a), otherwise the process proceeds to step S5c (NO in step S4a).
[0039]
In step S4b, it is determined whether or not a predetermined time has elapsed since the movement angle data in step S4a was output. The predetermined time is a predetermined time sufficient to surely return the pointer to the initial position. If it is determined that the predetermined time or more has elapsed, the process proceeds to step S6, and the pointer is electrically reversed by one or two cycles for checking the stopper contact (YES in step S4b). If not, the process proceeds to step S5c (NO in step S4b).
[0040]
In step S5c and step S5d, a maximum correction value corresponding to the maximum command delay angle that can be generated in design is added to the current position θ ′ stored in the RAM 3a3, and this is output as movement angle data. Then reverse the pointer to reverse the pointer to the initial position. For example, as shown in FIG. 4, the maximum instruction delay angle that can be generated in design means that the time until the gauges reach the target angle determined from the sensor measurement value when the power is turned on is set to a constant value t1. It is calculated as the delay amount ΔS1 between the generated microcomputer angle data D1 and the actual instruction value D2 under the set conditions. Even when the pointer shown in FIG. 5 is increasing, the time until the gauges reach the target angle determined from the sensor measurement value when the power is turned on is set to a constant value t1 as in FIG. It can be calculated as a delay amount ΔS2 between the generated microcomputer angle data A1 and the actual instruction value A2. Then, after step S5c and step S5d are completed, the process proceeds to step S6, where the pointer is electrically reversed for 1 to 2 cycles to confirm stopper contact, and then returns to the normal operation of step S7.
[0041]
As described above, according to the present embodiment, the maximum correction value corresponding to the maximum instruction delay angle that can be generated in design is added to the current position θ ′ stored in the RAM 3a3, and this is added to the movement angle data. Since the pointer is reversely rotated to the initial position, the pointer can be reliably returned to the initial position in a short time.
[0042]
【The invention's effect】
As described above, according to the first aspect of the present invention, the predetermined correction value based on the instruction delay angle with respect to the pointer position on the data indicated by the pointer position information stored in the pointer position information storage means. Since the position of the pointer is controlled by adding, the pointer is reliably returned to the initial position in a short time, and the stopper contact confirmation operation can be performed.
[0043]
According to the second aspect of the present invention, when the position of the pointer stored in the indicated position information storage unit 3a3 is closer to the zero position than the predetermined position, the stopper contact confirmation operation is performed directly, so that useless operation is performed. Is avoided, and the stopper contact confirmation operation can be completed in a short time.
[0044]
According to the invention described in claim 3, it is determined whether the pointer is rising or falling toward the target angle, and it is determined whether to add or subtract the correction value based on the determination result. Therefore, the pointer can be reliably returned to the initial position in a short time, and the stopper contact confirmation operation can be performed.
[0045]
According to the fourth aspect of the invention, the maximum instruction delay angle that can be generated in design with respect to the angle stored in the instruction position information storage means 3a3 is set as the correction value. It is possible to reliably return to the initial position in a shorter time and perform the stopper contact confirmation operation.
[0046]
According to the fifth aspect of the present invention, the amount of movement of the angle corresponding to one or two electrical cycles is further added to the angle stored in the indicated position information storage means 3a3 to correct the indicated delay. As a result, the initial position return operation and the stopper contact confirmation operation that are more realistic are performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of a stepper motor type indicating instrument of the present invention.
FIG. 2 is a schematic configuration diagram showing a stepper motor type indicating instrument according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a processing procedure according to the present embodiment performed by the CPU of FIG. 2;
FIG. 4 is a graph showing instruction responsiveness while the pointer of the stepper motor according to the present embodiment is being lowered.
FIG. 5 is a graph showing the instruction response when the pointer of the stepper motor according to the present embodiment is rising.
[Explanation of symbols]
1 Stepper motor (drive means)
1d piece
1e Stopper
3 Stepper motor drive unit
3a microcomputer
3a1 CPU
3a2 ROM
3a3 RAM (indicated position information storage means)
31 Instantaneous power interruption judging means
32 Control means
33 Stopper contact confirmation means

Claims (5)

Via the macro section that performs processing for realizing a smooth and Kana micro step drive, a stepper motor type indicating instrument to move the pointer to the pointer position in accordance with the measured quantity to be displayed by controlling the driving means ,
Pointing position information storage means for storing pointer position information indicating the position of the pointer when power supply from the power source to the apparatus main body is stopped;
In response to the activation of the apparatus main body, the instantaneous power interruption determination means for determining whether the activation is a restart due to the occurrence of an instantaneous power interruption in which the supply of power is instantaneously stopped;
When it is determined by the instantaneous power interruption determination means that the activation is in response to the occurrence of the instantaneous power interruption, the pointer position on the data indicated by the pointer position information stored in the pointer position information storage means A control means for controlling the driving means by adding a predetermined correction value based on an instruction delay angle caused by a time required for the processing related to the microstep driving in the macro section ;
Stopper contact confirmation means for performing a stopper contact confirmation operation based on the pointer position controlled by the control means;
A stepper motor type indicating instrument comprising: The pointer-type meter according to claim 1,
When the position of the pointer stored in the indicated position information storage means is closer to the zero position than the predetermined position, the stopper contact confirmation means performs the stopper contact without performing the movement control of the pointer by the control means. Stepper motor type indicating instrument characterized in that a confirmation operation is performed. The pointer-type meter according to claim 1,
A stepper motor type indicating instrument characterized by determining whether the pointer is rising or descending toward a target angle, and determining whether to add or subtract the correction value based on the determination result. The pointer-type meter according to claim 1,
A stepper motor type indicating instrument characterized in that a maximum instruction delay angle that can be generated in design with respect to the angle stored in the indicated position information storage means is used as the correction value. The pointer-type meter according to claim 1,
A stepper motor type indicating instrument for correcting an instruction delay angle by further adding an angle movement amount corresponding to one or two electrical cycles to the angle stored in the indication position information storage means .

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