JPH09184855A - Indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily correct indicating characteristic errors because of an error generated when a pointer of an indicator is fitted in a production process, etc., by simply adjusting opening/closing of a simple terminal constitution on a printed board. SOLUTION: Indicating data having predetermined indicating characteristics at an indicating part 6 are stored in a memory 3 corresponding to digital signals as measuring signals from an object to be measured. In a precedent stage of a processing part 2 having the memory 3, correcting data are generated by a setting terminal part such as a jumper line, solder land bridge, cut pattern or dip switch. The correcting data are added to or subtracted from the measuring digital signal at a correcting part 4, thereby correcting the signal. Accordingly, the indicator can be adjusted so that the indicating data from the memory 3 based on the corrected digital signal have a required indication characteristic. In an inspection step, while an indication by a pointer 8 corresponding to a predetermined inspection input signal of the indicating part 6 is confirmed, the indicator is adjusted to be opened/closed by the setting terminal part to be within a tolerance. The indicator can thus be corrected to the required tolerance cansiderably simply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicating instrument which is used, for example, in a vehicle speedometer, a tachometer and the like, and which uses a pointer to indicate a measured quantity.

[0002]

2. Description of the Related Art Generally, as a structure for indicating the measured quantity of an object to be measured with a measuring instrument, a display output from the object to be measured is converted into an appropriate electric signal and a pointer of the measuring instrument is driven to display the indicator board. It is read by contrast reading with the scale.

In order to measure the quantity to be measured by such an electric instrument, for example, the traveling speed of the vehicle or the engine speed is detected by a rotation sensor or the like, and an electric signal output such as a pulse signal is measured by gate time measurement or cycle measurement. Calculate the corresponding speed data and rotation speed data, apply the indicated current to the instrument body such as the cross-coil type instrument based on the calculated data, and use the pointer connected by the movement drive of the movable magnet etc. by this energization amount. It is configured to rotate angularly, and the output signal from the sensor is directly input into the indicating instrument to obtain each measurement data, or the signal from the sensor incorporated in the vehicle electrical equipment outside the indicating instrument is output. Method to convert into measurement data and transmit by serial signal in multiplex communication by inputting signal from control circuit etc. and converting into drive current It has been adopted.

[0004]

However, in such an indicating instrument, the number of coil windings in the instrument body such as the cross coil type instrument, the structure of the magnetic circuit, the pointer balance, the driving error of the pointer on the rotating shaft, and the like. Each of the instrument main bodies produced by the above causes a deviation in the indicating characteristics under the same energization condition, and some correction process is required.For example, after converting the input pulse signal into an analog signal once and correcting the voltage, It is possible to convert it into a digital signal again and perform arithmetic processing as an instruction signal of the instrument, but if the digital electric signal originally obtained as a pulse signal can be directly processed by a digital circuit, the calculation efficiency will increase. Regardless, it becomes useless additional processing,
Further, the problem that the measurement amount changes due to the repetition of the digital / analog conversion process also occurs.

Therefore, it is an object of the present invention to provide an indicating instrument capable of easily correcting the indicated characteristic by correcting the measured signal by digital processing.

[0006]

SUMMARY OF THE INVENTION The present invention provides a digital signal as a measurement signal corresponding to a physical measurement amount of an object to be measured and an indicator such as a cross coil type instrument for indicating a physical measurement amount of the object to be measured. And a processing unit having a memory in which the instruction data corresponding to the input digital signal is stored in advance as a predetermined instruction characteristic of the instruction unit, and any correction data for the input digital signal in the preceding stage of the memory. And a setting terminal unit for setting correction data for the input digital signal to the correction unit by opening and closing the terminal of the data input terminal.

Further, according to the present invention, the terminal setting portion is constituted by a jumper wire, a solder land bridge, a cut pattern or a DIP switch provided on a printed board, alone or in combination.

Further, the present invention corresponds to an instrument main body such as a cross coil type instrument for indicating a physical measurement amount of an object to be measured by a pointer position with respect to a scale on a display plate, and a physical measurement amount of the object to be measured. A swing angle calculation unit that converts a measurement signal into a pointer swing angle signal of the instrument body, and a correction unit that adds or subtracts arbitrary correction data from the swing angle signal from the swing angle calculation unit to generate an indicator characteristic signal. And an operation processing unit including a correction data generation unit capable of setting the correction data to the correction unit by electrically opening and closing a setting terminal provided outside the circuit, and instruction data based on address data corresponding to the instruction characteristic signal. To output the instruction data as a predetermined instruction characteristic of the instrument body in advance, and a drive section for driving the instrument body based on the instruction data from the memory section. It was.

Further, according to the present invention, the correction data generating section is a setting terminal section composed of a jumper wire, a solder land bridge, a cut pattern or a DIP switch provided on a printed board, alone or in combination, and this setting terminal section. And a correction data generation unit that generates the correction data based on the setting input of.

Further, according to the present invention, the arithmetic processing section is provided with a modulation signal generating section for generating a predetermined modulation signal which is preset in addition to the correction data set by the setting terminal and for supplying the predetermined modulation signal together with the correction data to the correction section. It was

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An instrument main body such as a cross coil type speedometer for indicating a physical measurement amount of an object to be measured, for example, a traveling speed of a vehicle by a pointer position with respect to a scale on a display plate, and a physical object to be measured. A swing angle calculator that converts the measurement signal corresponding to the measured amount into the pointer swing angle signal of the instrument main body, and as a speedometer by adding or subtracting arbitrary correction data to the pointer swing angle signal from this swing angle calculator. Correction unit for generating the indicating characteristic signal of the above, and the correction data for the correction unit, which is provided outside the circuit, and can be set by electrical opening / closing of a setting terminal, for example, selective laser cutting of a cut pattern on a printed board. The instruction processing is composed of a data generating section, and the instruction data is recorded in advance as a predetermined instruction characteristic of the instrument main body so that the instruction data is output based on the address data corresponding to the instruction characteristic signal. By including the memory unit such as the ROM and the drive unit that drives the instrument main body based on the instruction data from the memory unit, a predetermined amount for the indicator plate scale of the instrument pointer in the finger-adjustment process of the instrument production. The adjustment can be easily performed only by opening and closing the setting terminal of the correction data generating unit so that the indication characteristic of the input value falls within the required fingertip standard range.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a basic circuit configuration diagram of the present invention. An embodiment in which a cross coil type instrument is used as an instrument body will be described taking a vehicle speedometer as an example.

In the figure, reference numeral 1 is a pulse signal generated from a vehicle speed sensor (electromagnetic pickup or Hall IC sensor) (not shown) at a frequency proportional to the traveling speed.
This is a so-called cycle measuring circuit that counts the reference clock signal in the input signal cycle with waveform shaping, etc., and is provided at the input stage of the instrument device mounted on the dashboard or in the control device near the vehicle speed sensor of the vehicle. It is provided.

When the control device is provided outside the measuring instrument together with another control system, the speed data periodically measured by the controlling device is converted into a serial signal, and another measuring instrument (rotometer, thermometer, etc.) in the measuring instrument is installed. It is transmitted by multiplex communication together with the measurement data to and is subjected to distribution conversion processing by the interface circuit in the instrument device. Here, the type in which the period measuring circuit for directly inputting and measuring the pulse signal from the speed sensor is incorporated will be described.

A memory (ROM) 2 receives speed data (digital signal which is a measurement signal) measured by the cycle measuring circuit 1 and previously stores instruction data corresponding to the input digital signal with predetermined instruction characteristics. ) 3 built-in,
For example, a processing unit for registering the address data divided into 256 corresponding to the maximum deflection angle, reading the input data with the input data, and outputting it as a meter drive signal.

When the speed data is transferred to the processing unit 2, the correction data is added to or subtracted from the input speed data by another correction data input, and the speed data corrected by the correction data is sent to the processing unit 2. Correction unit to output.

Reference numeral 5 denotes a setting terminal portion which can arbitrarily set correction data to be given to the correction portion 4, and includes a jumper wire,
The correction signal is input to the correction data input terminal of the correction section 4 by electrically opening and closing a solder land bridge, a cut pattern, a DIP switch, or the like. This setting terminal unit 5 can be freely set together with the input processing configuration of the correction unit 4 depending on at which point in the designated range the designated characteristic is corrected.

Reference numeral 6 is a speedometer as an indicator, which indicates a traveling speed by an ammeter such as a well-known cross-coil type meter by a rotation instruction position of a pointer 8 with respect to a scaled display plate 7. Is. When using a cross-coil type instrument, drive the internal movable magnet by supplying a sine-wave characteristic signal and a cosine-wave characteristic signal to the cross-wound coil over the indicated range of the measurement signal. It can be instructed as the rotation of the pointer 8 fixed to the.

The indicator characteristic of the meter is generally required to be able to indicate the pointer within the indicator error range which is allowed with respect to the scale interval or zero point position of the instrument display plate, and as shown in FIG. If the graduation interval is a linear characteristic, it suffices if the zero point and the tilt angle can be adjusted, and a predetermined input signal that is easily obtained to obtain a predetermined instruction characteristic A required according to each rotation characteristic of the instruction unit 6 is obtained. On the other hand, when the indicating characteristic B of the pointer 8 deviates from the required indicating characteristic A, the deviation of the zero point instruction O is first level-shifted for reading the instruction data stored in the memory 3 of the processing section 2. It suffices to set correction data that can be corrected, for example, as data addition / subtraction processing in the correction unit 4, addition or subtraction of a fixed value of correction data selected from input data, and A predetermined value for determining the in setting unit 5 correction data may be set by a binary data represented by the selected cutting multiple cut pattern.

The inclination correction can also be performed by a calculation process. If the inclination coefficient is input as correction data in the correction unit 4 and the inclination correction operation is performed on the input data based on the inclination coefficient, a predetermined inclination is obtained. The adjusted output data can be obtained. In this case, the formation data by opening / closing the terminal in the setting terminal unit 5 may be any data for setting the inclination coefficient. That is, the zero point adjustment and the tilt adjustment are performed by the correction unit 4.
In the linear characteristic, when the input data X, the corrected output data Y, and the correction coefficients a and b for the zero point and the inclination are used, simply, Y = aX
It can be corrected by an arithmetic expression such as + b.

In this way, if the correction section 4 is provided with a calculation function for data correction and a correction data input terminal section,
For simple correction, the setting terminal unit 5 connected to the correction unit 4
As for the configuration, it suffices to simply connect an electrical switching means such as a cut pattern directly to the correction data input terminal section of the correction section 4.

FIG. 3 shows another embodiment of the present invention, in which the control circuit incorporated in the control system of the vehicle outside the instrument device measures the period of the embodiment and transmits it as a serial signal by multiplex communication. An indicating instrument of the type that receives a digital signal that is generated will be described.

The basic structure is the same as that of the above-mentioned embodiment, but the signal processing structure of the instrument and the correction data setting structure are more specified, and the speed data transmitted as a serial signal is binary-coded by the interface 10. Convert it to a digital signal, and convert this digital signal (measurement signal) into a pointer swing angle signal of the instrument (angle display signal that serves as a reference for generating data for finally giving a predetermined swing angle to the pointer of the instrument). The swing angle calculation unit 11 converts the data, and further, the delay circuit 12 for suppressing the phenomenon of the pointer jumping in response to a sudden change in the input data is processed so as to change the input data that changes abruptly in a stepwise manner. An instruction processing function in which the same data correction as that of the above-described embodiment is added by the arithmetic processing unit 13 which inputs an angle signal and adds or subtracts arbitrary correction data. And configured to output a signal.

Further, the arithmetic processing section 13 receives the set correction data and corrects the correction data by electrical opening and closing provided on the printed circuit board and the correction section 14 which performs addition or subtraction correction based on the correction data. A correction data generating unit 15 including a setting terminal for setting is set, and the delayed swing angle signal is corrected by the correction unit 14 by the correction data set by the correction data generating unit 15 and an instruction characteristic signal is output.

The correction data generator 15 has a configuration in which the number of terminals is set so that the correction data is directly formed as a binary digital signal as in the above-described embodiment, and simpler terminal adjustment is possible. Therefore, the correction data can be generated by an internal calculation or an internal logic circuit.

For example, two solder land bridges 15A and cut patterns 15B as shown in FIG. 4 are prepared as terminal terminals for electrical opening / closing adjustment as setting terminal portions.
It can be configured to output a plurality of types of correction data that are logically set in advance by a correction data generation unit such as an arithmetic circuit or a logic circuit, which is not shown, depending on the combination of opening and closing. In addition, when the variation of the instrument is within a certain upper and lower width range and the correction can be simply performed in two fixed upper and lower stages, each of the two solder land bridges 15A is connected by soldering (from the open loop). Alternatively, the correction data may be generated on the plus side and the minus side, respectively, by performing grounding by closing or cutting the cut pattern 15B by laser.

In the correction data generator 15,
In addition to setting the correction data in a simple open / closed state by opening / closing the terminal, it is also possible to provide an arithmetic processing function to set the correction data more finely according to the number of times the terminal is opened / closed. It is also possible to set the same value as the terminal opening / closing frequency setting by the number of times the terminal is closed and turned on. Also, when setting the correction data, other special modulation characteristic data is generated together with the data by the terminal opening / closing and finally corrected. It is also possible to output a signal having the indicating characteristic required by the unit 14.

Here, the modulation characteristic data basically includes, for example, an indicating instrument having a predetermined linear indicating characteristic in a storage structure of the indicating data so that a basically linear indicating characteristic can be obtained. In designing an indicating instrument having a special non-linear indicating characteristic to be used as a common circuit section, the correction data generating section 15 separates data of such non-linear characteristic into another circuit (modulation signal generating section).
, Or a signal with a high frequency superimposed on the basic instruction data for hysteresis absorption may be used, and correction is performed within the allowable range of this nonlinear characteristic or hysteresis absorption signal superimposed signal characteristic. It is also possible to add a terminal opening / closing adjustment to the.

The indicating characteristic signal thus corrected as desired is inputted to the memory section 16 in which the indicating data of, for example, 256 resolution, which shows a prescribed indicating characteristic corresponding to the input data (address designating signal), is stored in advance. Then, the instruction data corresponding to the input data is read out and the indicating instrument 18 is driven through the drive circuit 17.

Here, the drive circuit 17 is the instrument body 1
Although the configuration changes depending on the type of eight, when the instrument main body 18 is a cross-coil type instrument and the sine wave characteristic signal and the cosine wave characteristic signal are given to two intersecting coils, it is D The A / A conversion circuit and the amplification circuit may be included, or a conversion circuit that converts instruction data into a PWM signal may be incorporated when performing PWM driving.

With the above construction, when the indicating characteristic of the pointer on the scaled display plate of the instrument main body 18 is out of the allowable range required for the predetermined inspection input signal, the open / closed state of the setting terminal portion is changed. By adjusting and setting so that the indication of the pointer is within the allowable range and fixing it, the instrument main body 1
It is possible to very easily correct the indicating characteristic error due to the pointer driving error of item 8 for each indicating instrument.

[0030]

As described above, according to the indicating instrument according to the present invention, in the indicating characteristic inspection in the production process of each indicating instrument, it is required by the simple operation of adjusting the open / closed state at the setting terminal portion provided in the indicating instrument. It is possible to correct the error within the allowable range of the indicated characteristic.

Further, since it is possible to freely set the correction data setting condition by the setting terminal unit and the data generation condition in the correction data generating unit according to the error occurrence characteristic peculiar to each kind of indicating instrument, the production in the production line is possible. It is possible to set the accuracy of correction adjustment and work difficulty according to the quantity and the process speed according to it, and it is possible to easily adjust the indication characteristics by simple terminal opening and closing adjustment work, so inspection and correction work can be performed. This is an extremely simple one, and it is possible to stably provide an indicating instrument having excellent indicating characteristics.

Further, regarding the indicating instrument having a slight difference in indicating characteristic depending on the indicating instrument type, the indicating characteristic suitable for each indicating instrument can be obtained by adjusting the setting terminal section by using the common circuit configuration including the memory section. It is also possible to set.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention.

FIG. 2 is an indicator characteristic diagram of an indicator instrument corrected according to the present invention.

FIG. 3 is a circuit block diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing an example of a setting terminal unit according to the present invention.

[Explanation of symbols]

 1 cycle measurement circuit 2 processing unit 3 memory 4 correction unit 5 setting terminal unit 6 indicator unit 7 display board 8 pointer 10 interface 11 swing angle calculation unit 12 delay circuit 13 calculation processing unit 14 correction unit 15 correction data generation unit 15A, 15B setting Terminal part 16 Memory part 17 Drive circuit 18 Instrument main body

Claims (5)

[Claims] 1. An indicator such as a cross-coil type instrument for indicating a physical measurement amount of an object to be measured, and a measurement signal corresponding to the physical measurement amount of the object to be measured are input as digital signals, and the input is internally performed. A processing unit including a memory in which instruction data corresponding to a digital signal is stored in advance as a predetermined instruction characteristic of the instruction unit, and a correction unit that adds or subtracts arbitrary correction data to or from the input digital signal in the preceding stage of the memory. An indicating instrument comprising a setting terminal section for setting correction data for the input digital signal to the correcting section by opening and closing a terminal of a data input terminal. 2. The indicating instrument according to claim 1, wherein the terminal setting unit is constituted by a jumper wire, a solder land bridge, a cut pattern, or a DIP switch provided on a printed board, alone or in combination. 3. An instrument main body such as a cross coil type instrument for indicating a physical measurement amount of an object to be measured by a pointer position with respect to a scale on a display plate, and a measurement signal corresponding to the physical measurement amount of the object to be measured. A swing angle calculation unit that converts the pointer swing angle signal of the instrument body, a correction unit that adds or subtracts arbitrary correction data from the swing angle signal from the swing angle calculation unit to generate an indicator characteristic signal, and this correction unit To output the instruction data based on the address data corresponding to the instruction characteristic signal, and an arithmetic processing section comprising an adjustment data generating section capable of setting the correction data to the above by electrically opening and closing a setting terminal provided outside the circuit. An indicating instrument comprising: a memory unit that stores instruction data as a predetermined indicating characteristic of the instrument body in advance; and a drive unit that drives the instrument body based on the instruction data from the memory unit. 4. The correction data generating section includes a setting terminal section configured by a jumper wire, a solder land bridge, a cut pattern or a DIP switch provided on a printed board, alone or in combination, and a setting input of the setting terminal section. The indicating instrument according to claim 3, further comprising a correction data generation unit that generates the correction data based on the above. 5. The calculation processing section includes a modulation signal generation section that generates a predetermined modulation signal that is set separately from the correction data set by the setting terminal and supplies the predetermined modulation signal to the correction section together with the correction data. The indicating instrument according to Item 3.