JPH034121A - Display instrument - Google Patents

Abstract

PURPOSE:To easily adjust a zero point and a full point by providing an arithmetic processing part which converts the signal from a transmitter according to a specific expression and outputs the resulting signal to a display function part, when a trigger for adjustment is not provided in a signal processing part. CONSTITUTION:When a tester 40 is in a nonconnection state, biphase signals from pick-off coils 2a and 2b of the transmitter H are led to a phase comparing circuit 30a to detect their phase difference, and a rectangular wave signal is outputted to a filter circuit 30b. The circuit 30b converts the phase difference into a voltage value, which is outputted to a CPU 30d through an ADC30c. The CPU 30 converts the signal based upon the phase difference and outputs the resulting signal to a display part 30e. Here, xIND is found from an equation, where xIND is a display value, (x) a measured input value, x0 a measure zero point, xF a measured full point, and F a full scale. When an adjustment is made by using the tester 40, the ON/OFF signal of the tester 40 is led to the CPU 30d and a set switch 30f is turned on to supply the trigger for adjustment to the CPU 30d; and reference biphase signals of the zero point and full point for adjustment are led though a switch SW1 at the same time.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a method for recording or displaying (including instructions) by inputting a signal from a predetermined transmitter such as a torque meter or a fuel gauge. This relates to a series of display instruments that have a display function that allows the user to adjust the zero point and full point (span) using tester salt. be.

<Prior art> Conventionally, as this type of technology, analog aircraft torque meters, fuel meters, etc. are known (for example,
For torque meters, see Aviation Instruments, pages 169-170.
Torquemeter” (Jijin Shokan).

The April 1, 1980 issue was published, and the fuel meter was published in the Japanese Patent Publication Publication No. 5
No. 1-85756, etc. are known).

For convenience of explanation, a torque meter will be explained below as an example.

FIG. 5 is a block diagram showing a general configuration of a torque meter, which is an example of a conventional technique.

Hereinafter, the conventional technique will be explained based on FIG. 5.

In FIG. 5, H is a transmitter that transmits a two-phase signal as an actual measurement value. In this transmitter H, 1a.

1b is a gear magnetic body attached at appropriate intervals on the engine output shaft; 2a, 2b are gear magnetic bodies 1a, 1
These pickoff coils 2a and 2b have permanent magnet cores, and when the gear magnetic bodies 1a and lb rotate, an alternating current voltage with a frequency proportional to the rotational speed is applied to each of the pickoff coils 2a and 2b. This is generated by the pickoff coils 2a and 2b, and a two-phase signal can be obtained as an actual measurement value.

Reference numeral 3 denotes a signal processing section configured to input a two-phase signal from the transmitter H and to instruct, for example, a torque based on that value using a display mechanism, in this case an instruction section. The signal processing section 3 includes a phase comparison circuit 3a that detects and outputs a phase shift difference between input two-phase signals, a servo amplifier section 3b that includes a span adjustment trimmer 3b, and a temperature compensation circuit, etc. A display mechanism (instruction unit) 3 that includes a servo instruction unit 3c+ that is driven by a torque motor M and gives torque instructions, a trimmer 3c2 for zero point adjustment, etc., and that displays the target (torque display).
This is a signal processing section consisting of C.

In this configuration, when torque is applied to the output shaft, the shaft is twisted, and the twist angle ψ is ψ=T'L/φ10
...It is expressed as (1). however,
T is the torque applied to the output shaft, L is the distance between the gear magnetic bodies,
φ is the relative angle difference in torque O, and θ is the relative angle difference in torque O. on the other hand,
Voltage E^, E generated in pickoff coils 2a and 2b
8 is EA = KA 5in (Z ωt 0a )
−(2) Ee=KaSin(Zωt Z(
'I'L/φ+θ) 1α) ...(3) where ω is the angular velocity, KA, 8 is a function (constant) of the rotation speed, z is the number of teeth of the gear magnetic material, and α is the initial value. A constant determined by conditions, t, is time. These two output voltages (2
Comparing the phase signals), it is found that the phase of equation (3) is delayed by the torsional toughness φ of the output shaft than the result of equation (2). That is, φ=Z (TL/φ10) ... (4)
It turns out that From equations (1) and (4), it can be seen that the torsional toughness φ of the output shaft is Z (gear) times the torsion ψ. The more gears there are, the better the accuracy. In this equation, φ changes with temperature, so a thermistor Th for temperature compensation is installed close to the pickoff coils 2a and 2b. As a result, the signal processing section 3 can drive the servo indicator via the phase comparator circuit 3a and the servo amplifier section 3b to instruct the torque.

A torque meter having such a configuration is usually connected to a tester 4 having a reference signal generator (5th
The figure shows a case in which switching is performed using the switch SW.After the rA adjustment is completed, the switch SW
is not required, the same applies hereafter), and confirms whether the zero point and full point are as specified. At that time, if it is outside the specified value, adjustment is performed using two trimmers: a zero point adjustment trimmer 3C and a span adjustment trimmer 3b.

<Problems to be Solved by the Invention> Such conventional techniques have the following problems.

■: Since it is necessary to adjust both the zero point and the full point, two tricycle switches are required, and installation of these switches requires securing space, which leads to an increase in the size of the device. This results in an increase in the cost of the entire instrument.

■=Trimmer adjustment requires adjustment tools such as screwdrivers, and it is troublesome because it requires adjusting both the zero point and full point, and it is difficult to adjust the accuracy because it is done by a person.
There are operational problems and accuracy problems.

The present invention has been made in view of the above problems of the prior art, and its purpose is to provide a display instrument that can automatically adjust both the zero point and the full point. This is what we provide.

Means for Solving the Problems> In order to achieve the above object, the present invention inputs a signal from a transmitter as an actual measurement value, processes the input signal in a signal processing section, and displays it in a display function section. A display instrument configured to display a desired display, including a tester that outputs a zero black reference signal, a full point base 2F signal, and an on/off signal, and an adjustment trigger that operates based on the on/off signal from the tester. a trigger generating section that emits a χ0 is the zero point, χF is the full point, and D is the full scale), and the signal is converted and output to the display function section, and when the tester is connected and the adjustment trigger is present, the zero point reference is Introduce the signal and the full-point reference signal, replace the values in the corresponding part of the above equation, and perform signal conversion processing.1! ! ! The present invention is characterized by comprising an arithmetic processing section that outputs the E signal to the display function section.

<Function> For example, a microcomputer (hereinafter referred to as rcPUJ) is provided in the signal processing unit as the If4g processing unit, and an adjustment trigger (hereinafter referred to as “trigger”) is generated internally or externally, such as a set switch. A trigger generation section (hereinafter referred to as a "set switch") is provided, and a program determines whether the signal from the tester is a zero point reference signal or a full point reference signal using a trigger from this set switch, and generates a zero point reference signal. In this case, adjust the zero point,
In the case of a full-point reference signal, full-point adjustment is automatically performed.

<Example> Examples will be described with reference to page I2!1.

In the following drawings, parts that overlap with those in FIG. 5 are given the same numbers, and explanations thereof will be omitted.

Here, the description will be made assuming that the display instrument is a torque meter, as in the case of the prior art.

FIG. 1 is a block system diagram of a torque meter for explaining a specific embodiment of the present invention.

In FIG. 1, 30 is a phase comparison circuit 30a, a smoothing circuit 30b, an ADC (analog-to-digital converter) 30c,
The signal processing unit includes a cPLJ 30d, a display 111j; 30e, and a set switch 30f (in this embodiment, the case is shown as being built-in, but of course it may be provided externally). Reference numeral 40 denotes an on/off signal generating section (for example, composed of an IC) 40 that internally outputs an on/off signal.
For example, a reference signal generator that outputs a, a zero point reference signal (hereinafter referred to as "zero point reference two-phase signal") and a full point reference signal (hereinafter referred to as "full point reference two phase signal"). This is a tester equipped with

In such a configuration, the operation is as follows. Incidentally, FIG. 2 is a time chart for explaining FIG. 1.

1 and 2, the tester 40 is in an unconnected state (at this time, switch SW1 is connected to the transmitter side in FIG. 1, but the actual instrument is, for example, an aircraft In cases where the tester 40 is attached to the
Figure 2 (1) from pickoff coils 2a and 2b
, (II) is guided to the phase comparator circuit 30a as an actual measurement value χ, and the phase difference thereof is detected. For example, the signal shown in FIG.
A DC rectangular wave signal of O to 5■ as shown in (to) is output to the smoothing circuit 30b. The smoothing circuit 30b converts this phase difference into a voltage value and outputs an output (analog signal) as shown in FIG. 2 (material) to the ADC 30c. ADC
30c converts the input analog signal into a digital signal and outputs it to the CPU 30d. The CPU 30d converts a signal based on the input phase difference to provide a torque instruction, and uses an LCD as a display function section, for example.
(liquid crystal display element), etc., is output to the display section 30e.

The result display section 30e digitally displays the torque value based on the two-phase signal.

At this time, the displayed value is χIND, and the actual input value is χ.

The measured zero point is χ. , the patent indication value χ
...(5) where F represents full scale.

By the way, in such a configuration, when performing automatic adjustment by the tester 40, the on/off signal from the tester 40 is CP
Wiring as shown by the broken line is conducted so as to be guided to U30d, and when the set switch 30f is turned on, a trigger for zero point and full point adjustment is given to the CPU 30d, and at the same time, a zero point reference 2-phase signal for adjustment is sent via the switch SWI. The signal and the full point reference two-phase signal are sent to the CPU via the phase comparator circuit 30a.
30d.

FIG. 3 is a flowchart showing the flow of the CPU zero point and full point adjustment program.

In Figure 3, do this before using the torque meter! The 1m operation is as follows.

First, the tester 40 side and the signal processing section are connected.

Then, normally, a zero point reference two-phase signal corresponding to the zero point is added and the set switch 30f is turned on to reach the zero point F.
I adjustment is performed, then a full point reference two-phase signal corresponding to the full point is added, and the set switch 30f is turned on to perform full point adjustment (of course, the reverse is also possible).More specifically, ( b): At the time of zero point adjustment, the CPU 30d determines the signal guided based on the signal from the tester 40 with the set switch "on" by the program, that is, this signal is the zero point reference two-phase signal value χTa( χTa is the value equal to the measured zero point χ0) and when "-a≦χTa≦a" (where a is the maximum predicted change in the zero point), then by setting χ in equation (5) to χTa, Executes signal conversion processing. Therefore, χIND=10/(χF−χo))F→O·(6) is output to the display section. At this time, χT&"χQ are stored in the nonvolatile memory.

(b): Similarly, at full point adjustment, the CPU 30
d is determined by the program to determine the signal derived based on the signal from the tester 40 when the set switch is "on", that is, this signal is the value χvb of the full point reference two-phase signal (χTb is a value equal to the measured full point χF) When "B-b≦χTb≦B0b" (where, B is the nominal value of the full point, and b is the predicted maximum change in the full point), by setting χ in equation (5) to χTb, Executes signal conversion processing. Therefore, χIN,D=((χTb-χo)/(χF-χ.)IF→1...(7) is output to the display section.At this time, χ=χTb is stored in the nonvolatile memory. .

(b) If the value of the reference two-phase input signal is a≦χTa
If neither ≦a” nor “B-b≦χTb≦B+b=”, even if the set switch is “on”, it is outside the adjustment range and the above-mentioned zero point adjustment and full point adjustment are not performed.

In this way, the zero point and full point of the signal processing section 30 can be automatically adjusted.

In addition, the tester 40 receives a zero point reference 2-phase signal and a full point reference 2 signal.
After outputting the phase signal, the set switch 30f is set to OFF.

During actual measurement (torque measurement) after the above adjustment, the set switch 30f is off, so the zero point value χ in equation (5). , the full point value χF does not change, so the signal processing unit 30 can display the display value χIND based on equation (5) on the display unit 30e.

Other Embodiments The present invention described above is not limited to application to torque meters; in other words, the input signal may be a current signal, voltage signal, etc. instead of a two-phase signal. For example, this can be done in a fuel consumption meter, etc.)
Needless to say, this can be handled by using another conversion circuit such as a current (voltage) conversion circuit instead of the phase comparison circuit. , the CPU performs calculations based on the current value (voltage value) signal, and the display function section performs display. Here, in the display function section,
Needless to say, it is not limited to a device having an instruction display function, but also includes, for example, a printing record display by guiding it to a recording section (not shown) (herein, " ).

FIG. 4 is a diagram showing another specific embodiment, and here the case of a fuel meter is shown.

In FIG. 4, Ha is a transmitter that includes a tank unit, a compensator unit, etc. and detects the amount of fuel N and outputs a capacitance signal as a detection signal, and 300 is a signal processing section. In this signal processing section 300, 300a is a circuit means for inputting a detection signal and converting it into, for example, a voltage signal, and 300c is an ADC for converting an analog value from this circuit means 300a into a digital value and outputting it to the CPU 300d. 300e and 300e are display units. In particular, here, the display unit 300e represents an analog indicator, and the display unit 300e2 represents a digital display.

3GOf is a set switch, 400 is a full point reference signal for testing (a signal that allows you to adjust the enbuity when the fuel in the actual fuel tank is empty) and a zero point reference signal (when the fuel in the actual fuel tank is full). This is a tester that outputs a signal that allows full adjustment of the state) and an on/off signal. Even in the case of this configuration, the adjustment operation as described above is performed. In addition, in the tester, full adjustment can also be made by configuring a capacitor that is equivalent to the increased capacitance of the sensor when the fuel tank is empty to create this kind of condition. It may be configured as a structure.

<Effects of the Invention> Since the present invention is configured as described above, it produces the following effects.

(2): The zero point and full point can be adjusted automatically using a tester and a trigger generating section composed of, for example, one set switch.

■Two improvements in operability and high-precision adjustment can be made easily.

(2): On the signal processing section side, only one set switch other than each processing circuit needs to be provided, so the space factor can be improved and the number of parts can be reduced. As a result, the device can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a block system diagram for explaining a specific embodiment of the present invention, FIG. 2 is a time chart for explaining FIG. 1, and FIG. 3 is an example of a CPU zero point and full point adjustment program. FIG. 4 is a diagram showing another specific embodiment, and FIG. 5 is a block diagram showing the general configuration of an analog aircraft torque meter. H, Ha... Transmitter, 3, 30.300... Signal processing section, 30c +' 300c... ADC (analog digital converter), 30d, 300d... Arithmetic processing unit (CPU), 30e , 300e, 300
e2...Display function section (display section), 30f, 3
00f...Trigger generation section (set switch), 4
, 40.400...Tester. 5- /d rh tb

Claims (1)

[Scope of Claims] A display instrument configured to process a signal from a transmitter in a signal processing unit to display a desired display in a display function unit, which outputs a zero point reference signal, a full point reference signal, and an on/off signal. a tester that operates based on an on/off signal from the tester and generates an adjustment trigger; and a trigger generation section that is provided in the signal processing section and generates a signal from the oscillator when the adjustment trigger is not present. χ_I_N_D={
(χ−χ_0)/(χ_F−χ_0)}F (However, χ_
I_N_D is the displayed value, χ is the input value, χ_0 is the zero point, χ
_F is full point and F is full scale), the signal is converted and output to the display function section, and when the tester is connected and the adjustment trigger is present, the zero point reference signal and full point reference signal are A display instrument comprising: an arithmetic processing section that introduces a signal, replaces the value of the corresponding part of the arithmetic expression, performs signal conversion processing, and outputs an adjustment signal to the display function section.