JP2002311041A - System for processing pulse signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a system for processing a pulse signal processing capable of providing good response in starting and smoothly moving a pointer immediately after starting. SOLUTION: The system includes a movement averaging processing means AV for performing movement averaging of pulse cycles of at least latest n pulses of pulse signals sequentially outputted from a rotation sensor RS with a cycle in proportion to a rotation speed of a rotor R, a pulse generating means PG for generating a narrow band pulse of a pulse width at least not more than a half cycle to a pulse cycle corresponding to a maximum rotation speed of the rotor R in every detection of the pulse signal from the rotation sensor RS from a start of rotation of the rotor R until the latest n pulse cycles at the first time, and a rotation speed operating means RV for operating the rotation speed on the basis of a pulse cycle of the narrow band pulse from the start of the rotation to a start of a movement averaging process, and operating the rotation speed on the basis of a value of movement average after the start of the movement averaging process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating operation of a pointer when displaying a pointer on a meter based on a pulse period of a pulse train signal from a vehicle speed detecting sensor, for example, a traveling speed of a vehicle or an engine speed. The present invention relates to a pulse signal processing method that starts smoothly from the start.

[0002]

2. Description of the Related Art Conventionally, as a so-called pointer type display device for displaying information by rotating a pointer, a speedometer for displaying a vehicle speed and a rotation of an engine as shown in Japanese Patent Application No. 7-187099, for example. There are tachometers that display numbers.

[0003] In such a pointer type display device, a target designated angle which is the next pointer angle is calculated based on the input cycle of the inputted pulse. In this calculation operation, an average period (an average input period) with respect to an input period of a plurality of pulses is used for the purpose of smoothing the movement of the pointer.
Is calculated, and the target pointing angle of the pointer is calculated based on the average input cycle.

[0004] That is, the past 4, 8, 16,. . . The input cycle of the pulse is obtained and held, an average input cycle is calculated from these input cycles, and a target pointing angle of the pointer is calculated based on the average input cycle.

However, in this process, an averaging output for calculating a vehicle speed, for example, is not output until the set number of pulses to be averaged at the beginning of the pulse input.
As a result, when the set number of pulses is actually obtained, the output of the set number of pulses is delayed, and the pointer of the meter shows a rapid movement.

[0006] Therefore t _0, t ₁ in order to solve such problems, at every elapse from the travel sensor, for example as shown in the timing chart of FIG. 7 (not shown) times,
t _3, t ₄ · · · · · t ₁₀ · · · t in _n input pulse inputted at the period of the first pulse period t to the averaging process the number of pulses set the output pulse (8 pulses) is aligned
The data is output at a fixed period obtained by multiplying ₀ by a predetermined conversion rate α.

To explain the microcomputer processing of this pulse signal output, as shown in the flowchart of FIG. 4, first, data of a memory and each input port are initialized (step S1) and then input to the input port. Of the input pulse from the traveling sensor, which is the data (step S
3) At this time, it is determined whether or not the rising edge of the first running pulse P1 has been detected as shown in FIG. 7 (step S5). If not detected, the process returns to step S3.

If detected, the reference clock signal in the microcomputer (not shown) is counted, and measurement of the cycle Tn until the rising edge of the second running pulse P2 is detected is started (step S7). After the start of the measurement of the cycle Tn, the data of the input port is read again, and it is determined again whether or not the rising edge has been detected (step S9). If a rising edge is detected, the cycle t measured so far
₀ is stored at address 0 of the memory shown in FIG.

Next, in order to count the number of period measurements, that is, the number of input pulses, 0 is input to N at N = N + 1 and N = N + 1.
1 (= 0 + 1) (step S15). Further, it is determined whether the number of pulses has reached N = 8, which is a number for performing the moving averaging process (step S17). At this time, of course, N =
Since it is not 8, the fixed period T ₀ when outputting output pulses at a fixed period until the number of input pulses becomes eight is set to t ₀ × α (conversion rate) from the first pulse period t ₀ measured first. An operation is performed (step S23).

When the fixed period T ₀ is calculated, the output pulses are output at the fixed period T ₀ irrespective of the input pulse period until the number of input pulses becomes eight and the pulse output period of the output pulse is determined by the moving average processing result. Output.

According to the calculated fixed period T ₀ , the deflection angle of the meter pointer (pointer pointing angle) is calculated, and a drive current corresponding to the deflection angle is supplied to the cross coil of the meter from the output port of the microcomputer. It is determined from the input signal of the travel sensor whether or not the vehicle speed measurement has been completed due to the vehicle stop (Step S).
27) If the measurement operation has not been completed, the period measured in step S13 to measure the time interval (second pulse period to seventh pulse period) between rising edges of adjacent input pulses sequentially input thereafter tn is cleared (step S25).

If the measurement cycle t _n has been cleared, the process returns to step S7, and the process returns to step S7 except for the average value calculation process in step S19 until N = 8 is determined in step S17.
To step S27. N = 8, that is, if it is determined in step S17 that eight input pulses have been input, the cycle data to to t7 from the addresses 0 to 7 of the memory shown in FIG.
_{1 is obtained} by the following equation (step S19).

T ₁ = ((t ₀ + t ₁ + t ₂ + t ₃ + t ₄ + t ₅₎
+ T ₆ + t ₇ ) / 8) × α

[0014] calculates a deflection angle of the pointer of the meter according to T _1, to angularly partial rotation shake guidance flowing from the microcomputer to drive current corresponding to the deflection angle to the meter of the cross coil (step S21).

Next, if the ninth input pulse is input, the ninth input pulse is shifted from the rising edge of the eighth input pulse to the ninth input pulse.
The period t ₈ until the rising edge of the second input pulse is overwritten on the address 0 of the memory, and the average value of the pulse period T ₂
Is obtained by the following equation (step S19).

T ₂ = ((t ₁ + t ₂ + t ₃ + t ₄ + t ₅ + t <sub>6)
+ T 7 + t 8) /</sub> 8) × α

In the following, moving average processing is performed by overwriting the oldest periodic data in the memory with the latest data every time the pulse cycle is calculated, and adding the contents of the memory to obtain an average value. The deflection angle of the pointer is calculated based on the output pulse cycle subjected to each moving average process, and the pointer is rotated.

[0018]

As described above, in the conventional apparatus, when the output pulse period is to be obtained by the moving averaging process of a plurality of input pulse periods, the output pulse period is not changed until the number of moving averaging process pulses becomes uniform. An output pulse is output at a fixed period based on the first pulse period between the first pulse and the second pulse, and the pointer swing angle is determined.

However, if the acceleration from the release of the brake of the vehicle to the constant speed is high, the pulse period is narrowed at an early stage. When the number of input pulses reaches the number of moving averaging processing pulses and the vehicle speed is detected from the moving averaging pulse period and the pointer of the meter is swung, a large angle is suddenly swung, and the movement of the pointer becomes unnatural. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a pulse signal processing method which has a good starting response and can smoothly move a pointer immediately after starting. And

[0021]

A pulse signal processing method according to the first aspect of the present invention is described below. As shown in the basic configuration diagram of FIG. 1, a moving averaging processing means AV for moving and averaging at least the latest n pulse periods of a pulse signal sequentially output from the rotation sensor RS with a period proportional to the rotation speed of the rotating body R. And until the first n latest pulse periods are obtained.
Each time a pulse signal is detected from the rotation sensor RS from the start of rotation of the rotating body R, a narrow band pulse having a pulse width of at least a half cycle or less with respect to a pulse cycle corresponding to the maximum rotation speed of the rotating body R is generated. Output pulse generating means PG
A rotation that calculates a rotation speed based on the pulse period of the narrow band pulse from the start of rotation until the moving average process is started, and calculates a rotation speed based on the moving average value after the start of the moving average process. Speed calculation means RV. According to the present invention, if a pulse signal is input from the rotation sensor RS with the rotation of the rotating body R, the number of the pulse periods is measured and the pulse cycle corresponds to the maximum rotation speed of the rotating body R when the pulse signal is input. Outputting a narrow band pulse having a pulse width of at least a half cycle or less with respect to the pulse cycle,
The rotation speed immediately after the start of rotation of the rotating body R is calculated based on the cycle of the narrow band pulse, and when the number of pulse signals reaches n, the pulse cycle is obtained by averaging a plurality of pulse cycles. The rotation speed is calculated based on the value.

The pulse generating means PG of the pulse signal processing system according to the second aspect outputs a narrow band pulse in synchronization with a rising edge of the pulse signal every time a pulse signal is input from the rotation sensor RS. is there. According to the present invention, the pulse width corresponding to the maximum rotation speed of the rotating body R is at least a half cycle or less with the detection of the rising etch of the pulse signal generated by the rotation sensor RS immediately after the rotation of the rotating body starts. Output a narrow band pulse.

According to a third aspect of the present invention, there is provided a pulse signal processing method, wherein a display position calculating means for calculating a speed display position on the meter based on the rotational speed calculated by the rotational speed calculating means.
S is provided. According to the present invention, immediately after the rotation of the rotating body starts, the speed display position on the meter M is calculated based on the rotation speed calculated according to the pulse period of the narrow band pulse, and n pulses as the number of moving average processing pulses are calculated. Is completed, the speed display position on the meter M is calculated based on the pulse cycle obtained by the moving averaging process.

The display position calculating means DIS of the pulse signal processing method according to claim 4 calculates the operating current value of the cross coil corresponding to the wobble angle of the pointer of the meter M. According to the present invention, immediately after the start of rotation of the rotating body, the meter M is calculated based on the rotation speed calculated according to the pulse cycle of the narrow band pulse.
In order to adjust the pointer to the speed display position, calculate the operating current value of the cross coil that determines the deflection angle of the pointer, and obtain the moving average processing when the n pulses, which are the number of moving average processing pulses, are completed. The speed display position on the meter M is calculated based on the obtained pulse period.

[0025]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, reference is made to FIG. FIG. 1 is a system configuration diagram for realizing the pulse signal processing method according to the present embodiment. In FIG. 1, reference numeral 1 denotes a display unit for displaying a running speed of a vehicle, 2 denotes a control unit for actually executing the present method by microcomputer processing, and 3 denotes a non-volatile memory (hereinafter, referred to as a storage device) in which information referred to by the control unit 2 is stored. A running sensor 4 outputs a running pulse P every time the vehicle runs a unit distance.

The display unit 1 includes a cross coil 11 composed of a first coil L1 and a second coil L2 arranged crossing each other, a magnet rotor 15 arranged in a magnetic field generated by the cross coil 11, and The pointer 12 connected to the magnet rotor 15 via the pointer shaft 14
And a dial 13 on which a scale for speed display is drawn.

The control section 2 comprises a CPU 21, a ROM 22, and a RAM 23. The CPU 21 functions as a so-called central control device that executes a predetermined processing operation according to an operation program. And this CPU 21
Is a V terminal to which a power supply voltage (DCV) from a battery (not shown) is inputted, a SPIN terminal of an input port to which a traveling pulse (input pulse) P from the traveling sensor 4 is inputted,
The display unit 1 has P1 to P4 terminals of output ports for outputting a drive signal according to the shake angle of the pointer 12.

The ROM 22 is configured as a storage unit in which an operation program of the CPU 21 and prescribed values given in advance are stored, and the stored contents are referred to by the CPU 21 when the apparatus operates.

The traveling sensor 4 is mounted, for example, on a transmission shaft, and when the transmission shaft rotates, outputs a traveling pulse Pn at a predetermined cycle according to the rotation speed. The output running pulse Pn is output from the interface (I / F).
After the waveform is shaped at 41, it is taken into the CPU 21 of the control unit 2.

In the present embodiment having the above configuration, the CPU 21 of the control unit 2 operates according to the operation program stored in the ROM 22. Then, an input cycle of the travel pulse Pn input from the travel sensor 4 via the interface 41 is acquired, and the acquired input cycle is compared with the memory addresses 0 to 7 in the input cycle holding area of the RAM 23 in the order in which the travel pulses are input. To be stored.

The input cycle stored at a predetermined memory address in the input cycle holding area is used together with the input cycle previously obtained and stored at another memory address, and is an average value based on each input cycle, that is, a moving averaged input cycle. Is calculated. In order to calculate the moving averaged input cycle, if the averaged input cycle is calculated, the oldest input cycle is overwritten by the latest input cycle input next, and the average value based on each input cycle, that is, the moving average The calculated input pulse period is calculated.

Based on the calculated averaged input pulse period, the drive signal for driving the display unit 1, that is, P, is referred to by referring to the shake angle information held in the NVM 3.
A current value output from the terminals 1 to P4 is obtained, and a drive signal of the obtained current value is output from each terminal, and
2 is positioned at a predetermined designated angle.

Next, the detailed operation of this embodiment having the above configuration will be described with reference to the flowchart of FIG. In this operation example, the process starts when the vehicle shifts from the stopped state to the running state. In the present embodiment, the pulse width A (≒ 550 μm) is detected every time the rising edge of the input pulse is detected as shown in the timing chart of FIG.
The output pulse at the H level in sec) is output in accordance with the cycle of the input pulse.

The pulse width of 550 μsec is 25 rotations per rotation.
200 km / h when using a pulse output travel sensor
When the vehicle runs at / h, the pulse cycle becomes 1.13 msec, which is a pulse width of H level which is a half cycle of this pulse cycle.

Here, the pulse width of 550 μsec is considered for a generally used traveling sensor. If the pulse width up to 200 km / h can be pulsed by a 25-pulse sensor, the pulse width of the input pulse must be equal before the number of moving averaging processing pulses becomes uniform. This is because even if the vehicle speed is accelerated and the input pulse period is narrowed and the output pulse period is narrowed, the acceleration state is sufficiently detected from the output pulse period and the hands can be smoothly rotated in accordance with the acceleration state. In FIG. 6, the period of the input pulse and the period of the output pulse are equally spaced, but the pulse period gradually narrows as the vehicle speed increases.

At the start of the processing, R
Each area 231 to 234 of the AM 23 is initialized, that is, reset to zero (step S1). When the initialization process is completed, the data of the input port is read, and it is determined whether or not the rising edge of the first input running pulse S (hereinafter, referred to as first running pulse P1) has been obtained (steps S3 and S5). ). This determination is made based on the running pulse P input to the SPIN terminal of the CPU 21. Then, in this step S5, the first traveling pulse P
When the rising edge of 1 has been acquired, the process proceeds to the next step S29, and when it has not been acquired, the process returns to step S3.

That is, in step S5, the presence or absence of the input of the first traveling pulse P1 is monitored, and the first traveling pulse P1 is monitored.
When 1 is input, the process proceeds to step S29. In step S29, an output pulse having a pulse width of 500 μsec is output in synchronization with the rising edge of the running pulse.
It is determined whether to output as shown in FIG.

The number of moving average processing pulses (8 pulses)
No output is provided if all are available. However, if the first running pulse P1 is being input, an output pulse having a pulse width of 500 μsec is output in synchronization with the rising edge of the first running pulse P1 (step S31).

When the rising edge is detected, the reference clock signal in the microcomputer (not shown) is counted, the measurement of the period t ₀ until the rising edge of the second input pulse P2 is detected, and the measured value is input. It is held in the period counter area (step S7). After the start of the measurement of the period t ₀ , the data of the input port is read again, and it is determined whether or not the rising edge is detected again (step S9,
S11).

If a rising edge is detected, 500 μs is synchronized with the rising edge of the running pulse P2.
It is determined whether an output pulse having an ec pulse width is output as shown in FIG. 6 (step S33). If the number of moving averaging process pulses (8 pulses) has already been prepared, the pulse is not output. However, if the second running pulse P2 is input, an output pulse having a pulse width of 500 μsec is output in synchronization with the rising edge (step S35). ).

The cycle t ₀ measured so far and held in the input cycle counter area is stored in the memory address (first
(Input period holding area) 0. Next, in order to count the number of cycle measurements, that is, the number of input pulses, 0 is input to N at N = N + 1 and N = 1 (= 0 + 1) (step S15). Further, it is determined whether or not the number of pulses has reached N ≧ 8 as a number for performing the moving averaging process (step S1).
7).

At this time, since N≥8, the period tn measured in step S13 is cleared to measure the second pulse period t ₁ to the seventh pulse period t ₆ ) (step S25). If the first pulse period t ₀ between the first traveling pulse P1 and the second traveling pulse P2 is calculated, the first pulse period t ₀ is compared with the deflection angle information held in the deflection angle information holding area, and A current of a cross coil driving signal corresponding to the angle information is supplied to the cross coil from terminals P1 to P4.

The above operation is performed up to the cycle measurement number N ≧ 8, and an output pulse having a pulse width of 500 μsec is output every time a rising edge of the input pulse is detected. Rotate. Then, the input pulse periods t _{0 to} t ₇ are stored in the memory for each address.

In step S17, N ≧ 8, that is,
If it is determined that eight input pulses have been input, then 550 μm is synchronized with the rising edge of the running pulse.
The output of the output pulse having the second pulse width is stopped (step S37). Addresses 0 to 0 of the memory shown in FIG.
The average value T ₀ of the pulse period readout pulse cycle data to~t7 from 7 finding by the following equation (step S1
9).

T ₀ = ((t ₀ + t ₁ + t ₂ + t ₃ + t ₄ + t ₅
+ T ₆ + t ₇ ) / 8) × α

The deflection angle of the meter pointer is calculated according to T _0, and the drive current to the cross coil of the meter is supplied from the microcomputer according to the deflection angle (step S 21). Thereafter, it is determined whether or not the measurement operation has been completed. If the measurement operation has not been completed, the input cycle counter area is cleared to prepare for the next pulse cycle measurement (step S25). Again, step S
The process is started from Step 7.

Next, when the ninth input pulse is input, the ninth input pulse is shifted from the rising edge of the eighth input pulse to the ninth input pulse.
Prompting pulse period t ₈ to the rising edge of the -th input pulse by the following formula a mean value T ₁ of the overwrite pulse period to the address 0 of the memory (step S19).

T ₁ = ((t ₁ + t ₂ + t ₃ + t ₄ + t ₅ + t ₆₎
+ T ₇ + t ₈ ) / 8) × α

In the following, the moving average processing is performed by overwriting the oldest period data in the memory with the latest data every time the pulse period is calculated, and adding the contents of the memory to obtain an average value.

Hereinafter, until the measurement operation is completed, the pointer is rotated at the deflection angle of the pointer based on the input pulse cycle calculated in the moving averaging process.

As described above, according to the present embodiment, from the start of traveling to traveling at a constant speed, the rising delay of the hands can be reduced even if the number of moving averaging processing pulses is not uniform, and the hands can be rotated smoothly. Can be done.

The present invention can be applied not only to the operation control of the cross coil in the pointer type display device but also to the setting of the number of driving pulses of the motor in the pointer type display device using a stepping motor. Further, it is needless to say that the present invention can be applied to speed control and speed detection of a rotating body that increases the rotation speed from low speed to high speed.

[0053]

According to the present invention, if a pulse signal is inputted from the rotation sensor RS with the rotation of the rotating body R, the number of the pulse periods is measured n and the maximum of the rotating body R is inputted when the pulse signal is inputted. A narrow band pulse having a pulse width of at least a half cycle or less with respect to a pulse period corresponding to the rotation speed is output, and a rotation speed immediately after the start of rotation of the rotating body R is calculated based on the period of the narrow band pulse. The signal is n
Once the number of pulses has been reached, the pulse period is obtained by averaging multiple pulse periods, and the rotational speed is calculated based on this average value. This has the effect of being able to calculate and output as a rotating speed.

According to the present invention, at least a half cycle or less of the pulse cycle corresponding to the maximum rotation speed of the rotating body R accompanying the detection of the rising etch of the pulse signal generated by the rotation sensor RS immediately after the rotation of the rotating body starts. By outputting a narrow band pulse with a pulse width, when the rotation speed is obtained by averaging processing results for a plurality of input pulse periods, even if the rotation speed rises sharply before the average processing pulse number becomes uniform, the rising speed In addition, there is an effect that the calculation output can be performed as a rotation speed that smoothly changes in consideration of the rotation speed.

According to the present invention, immediately after the rotation of the rotating body is started, the speed display position on the meter M is calculated based on the rotation speed calculated according to the pulse period of the narrow band pulse, and the number of moving average processing pulses is n. Is completed, the meter M is calculated based on the pulse period obtained by the moving averaging process.
By calculating the upper speed display position and displaying the speed, there is an effect that a change in the rotational speed can be smoothly displayed on the meter without a sharp displacement point than at the start of rotation.

According to the present invention, immediately after the start of rotation of the rotating body, the cross-coil for determining the deflection angle of the hands to adjust the hands to the speed display position on the meter M based on the rotation speed calculated according to the pulse period of the narrow band pulse. Is calculated, and if n pulses, which are the number of moving average processing pulses, are completed, the speed display position on the meter M is calculated based on the pulse period obtained by the moving average processing, and the pointer is indicated. By rotating the pointer, there is an effect that the change of the rotation speed can be performed without a sharp displacement point than at the start of rotation, the pointer can be smoothly rotated, and the pointer can be displayed on the meter.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a pulse signal processing system according to the present invention.

FIG. 2 is a system configuration diagram for realizing a pulse signal processing method according to the present embodiment.

FIG. 3 is a flowchart illustrating the operation of the pulse signal processing method according to the present embodiment.

FIG. 4 is a flowchart illustrating the operation of the conventional system.

FIG. 5 is a configuration of a memory map of a RAM shown in FIG. 2;

FIG. 6 is a timing chart illustrating the operation of the present embodiment.

FIG. 7 is a timing chart for explaining the operation of the conventional method.

[Explanation of symbols]

 R rotator RS rotation sensor AV moving average processing means PG pulse generation means RV rotation speed calculation means DIS display position calculation means M meter

Claims (4)

[Claims] A moving average processing means for moving and averaging at least the latest n pulse periods of a pulse signal sequentially output from a rotation sensor at a period proportional to the rotation speed of the rotating body; Until n pulse periods are obtained, each time a pulse signal is detected from the rotation sensor from the start of rotation of the rotating body, at least a half cycle with respect to the pulse cycle corresponding to the maximum rotation speed of the rotating body R Pulse generating means for outputting a narrow band pulse having the following pulse width,
Calculate the rotation speed based on the pulse cycle of the narrow band pulse until the moving average process is started from the start of rotation,
And a rotation speed calculating means for calculating a rotation speed based on the moving average value after the start of the moving average processing. 2. The pulse generator according to claim 1, wherein each time the pulse signal is input from the rotation sensor, the pulse generator outputs a narrow band pulse in synchronization with a rising edge of the pulse signal. Pulse signal processing method. 3. A display position calculation means for calculating a speed display position on a meter based on the rotation speed calculated by said rotation speed calculation means.
The pulse signal processing method described in 1. 4. The pulse signal processing method according to claim 3, wherein said display position calculating means calculates an operating current value of the cross coil corresponding to a wobble angle of the pointer of the meter.