JP3089722B2 - Buffer control device for synchro indicator in ship maneuvering simulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchro indicator in a ship maneuvering simulator, and more particularly, to a buffer control device for smoothly changing the pointer of the synchro indicator.

[0002]

2. Description of the Related Art In general, in order to effectively conduct a ship maneuvering training using a ship maneuvering simulator, it is necessary to create a bridge model having the same maneuvering performance as an actual ship and a maneuvering situation close to the actual one. For this reason, a ship maneuvering simulator including a full-size (mock-up) bridge and a large-screen view reproduction device using computer graphics has been proposed.

Conventionally, in such a mock-up type large ship maneuvering simulator, various indicating instruments are installed in a bridge like an actual ship, and for example, a compass (gyro repeater), a main shaft tachometer, a wing angle meter, An indicator system such as a steering angle meter, an anemometer, and a speedometer is constructed. The indicator of this indicator system uses exactly the same instrument as the actual synchro indicator using the synchro receiver because of the request to make it the same as the actual ship. Among them, the compass is characterized in that it rotates over 360 °.

FIG. 6 shows a configuration of a synchro indicator system of a compass in a conventional boat maneuvering simulator. Steering wheel 1
Is calculated based on the rotation angle of the ship. Therefore, the sync signal from the sync transmitter 2 on the steering wheel 1 side is converted to a digital signal by the S / D converter 3, converted to an analog signal via the D / A converter 4, and then guided to the computer 5. . In the computer 5, the analog signal is converted into a digital signal through an A / D converter 6 and input to a data processing unit 7. The azimuth of the own ship based on this is calculated. The simulated azimuth is converted into an analog signal by a D / A converter 8, output as a digital signal by an A / D converter 9, and then converted into a synchro signal by a D / S converter 10. Then, it is added to the sync receiver 11. The synchro receiver 11 constitutes a synchro indicator 13 for an azimuth meter together with the indicator 12, and rotates to an angular position corresponding to the azimuth of a given azimuth signal.

[0005]

However, in the conventional synchro indicator system described above, the azimuth signal is transmitted from the A / D converter 9 to the D / S converter 10, for example, a digital value corresponding to azimuth 5 °. In this case, the sync receiver 11 instantaneously reacts to this and jumps to the azimuth of 5 °, causing a problem that the pointer of the indicator 12 does not move smoothly and becomes unnatural.

As a method of avoiding the unnaturalness of the needle movement, an azimuth angle instruction given from the data processing unit 7 is expressed in units of an angle corresponding to the minimum resolution of the indicator 12, for example, 2 °. It is conceivable to transmit the angle signal a plurality of times until the azimuth indication value is reached. That is, when the indicated azimuth angle is 10 °, a total of 5 times transmission is performed with the minimum resolution of 2 ° as a unit. However, in this method, the indicator 12
In order for the pointer to make a natural smooth movement, the minimum resolution must be extremely fine. Therefore, a dedicated computer must be used, which greatly increases the price of the ship maneuvering simulator.

Next, in the case of the synchro indicator 13 for the compass, there is a problem unique to the compass that the pointer of the indicator 12 rotates 360 ° or more.

[0008] In detail, if the steering angle meter or the like, the indicator 12
Can be rotated up to the maximum limit of 35 °, but in the case of a compass, the instrument surface 360 ° is set to 9 as shown in FIG.
If the pointer is divided into four sectors (quadrants I, II, III, IV) by 0 °, the pointer may move from quadrants III, IV to quadrants I, II or vice versa. For example, in FIG. 5, assuming that the previous azimuth (pointer position) T-1 is 340 ° and the current azimuth T0 is 0 °, the direction in which the pointer should move moves from 340 ° to 0 °. Must be direction.

However, the designated azimuth angle from the computer 5 is given as a digital value representing the range of the instrument plane 360 ° in advance by a finite number of bits. This is because it is not advisable to prepare an infinite number of digital values over 360 °. Therefore, the azimuth 0 ° is changed to the digital value
When 360 ° corresponds to a digital value of 10V, the digital value at the previous azimuth T-1 (340 °) is about 9.2V, so the current azimuth T0 (0 °)
When the voltage of 0 V is commanded, the synchro indicator 13 suddenly receives a voltage of 0 V from about 9.2 V. For this reason, the pointer of the synchro indicator 13 moves counterclockwise in FIG. 5, and does not perform the above-described shorthand movement. Therefore,
There is a problem that it will move completely different from the compass of the actual ship.

[0010] The present invention has been made in view of the above,
In the synchro indicator system of the ship maneuvering simulator,
An object of the present invention is to provide a buffer control device capable of smoothly and quickly changing a hand of a synchro indicator without using a dedicated computer.

[0011]

SUMMARY OF THE INVENTION A buffer control device for a synchro indicator according to the present invention receives a pseudo-designated indication angle signal and obtains a comparison output according to a magnitude relationship with respect to a reference value and a negative output thereof. A switch for switching the output of the comparator from a normal comparison output to a negative output, a gate opened by an output from the switch and passing a clock from an oscillator, and adding or subtracting a clock from the gate to add or subtract the clock from the gate. A reversible counter that uses a sequential count value as a reference input of the comparator and an input of a D / S converter of a synchro indicator, and when the indicated angle signal is given, the indicated angle signal becomes the previous count output value. A judgment circuit for judging whether or not the value should make a short circuit, and switching the switch from the normal comparison output of the comparator to the negative output side when the judgment result is a short circuit It is intended.

[0012]

The comparator 21 receives the indication angle signal (digital signal) D1 created in a simulated manner, compares it with a reference value D2, and determines whether the magnitude relationship with the reference value D2 is, for example, D1.
When <D2, an output is generated as the normal comparison output D1 <D2 and its negative output (D1> D2) ^* . The changeover switch 23 selects the normal comparison output D1 <D2, and the gate 27 is opened by the normal comparison output D1 <D2. Clock CK from oscillator 28 through open gate 27
Is input to the reversible counter 29 and is subtracted. When the count value D2 increases and D1 = D2, the normal comparison output D
1 <D2 disappears and the counter stops. In this counting process, the output value D2 of the reversible counter is input to the D / S converter of the synchro indicator each time one clock is counted. Therefore, the synchro indicator moves in the negative direction, that is, in the counterclockwise direction. However, the movement of the pointer is smoother than in the case where the synchro indicator operates according to the indication angle signal D1.

As one of the cases of D1 <D2, for example, when the previous count output value D2 is at the angle value of the fourth quadrant, it is assumed that the designated angle signal D1 of the angle value of the first quadrant is given. In the case of changing the hand from the fourth quadrant to the first quadrant, the determination circuit 22 determines that the transition to the designated angle position should take a short-hand changing movement, and sends a short-cut selection signal to the switch 23. And switches the switch 23 from the side of the normal comparison output D1 <D2 of the comparator 21 to the side of the negative output (D1> D2) ^* . As a result, the gate 26 is opened by the negative output (D1> D2) ^* , and the clock CK input through the gate 26 is supplied to the reversible counter 2
9 is added, and the pointer moves in the forward direction, that is, clockwise in the opposite direction to the above case, and moves shortly from the previous pointer position.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a synchro indicator system of a compass of a boat maneuvering simulator. FIG.
The difference is that a buffer control device 20 is provided between the converter 9 and the D / S converter 10. In addition, a pointing azimuth (pointing angle signal) D1 artificially created by the computer 5
Is given at an angle of less than 180 ° with respect to the previous designated azimuth value D2, and an angle having a difference of 180 ° or more is not output.

As shown in FIG. 2, the buffer control device 20
Comparator 21, short circuit determination circuit 22, changeover switch 2
3, an AND gate 26, 27, an oscillator 28 and a reversible counter 29. The comparator 21 has two input terminals A and B, and A> B, A <B, (A> B) ^* ,
(A <B) There are four comparison output terminals of ^* . Here, * marks attached to (A> B) ^* and (A <B) ^* mean negation of A> B and A <B, respectively.

An input terminal A of the comparator 21 is provided with an indicated direction D1 created by the data processing section 7 in a pseudo manner.
It is input from the converter 9 in the form of a digital signal. In the case of the present embodiment, the designated direction D1 is the value D of the previous designated direction.
2 at an angle of less than 180 °. The comparator 21 compares the digital input value of the designated azimuth D1 with the digital output value D2 of the reversible counter 29 provided as a reference value (previous azimuth T-1) to the input terminal B, and according to the magnitude relation. And output terminals A> B and (A>
To B) ^* set or A <B and (A <B) ^* set, the output of the time width corresponding to the instruction azimuth D1 a1, b2 or a2, b1
Occurs. That is, when the input designated direction D1 is larger than the counter output value D2 which is the previous direction (D1> D
2) output terminals A> B, (A> B) ^* output a1,
b2 is generated, and when the input designated direction D1 is smaller than the counter output value D2 (D1 <D2), outputs a2 and b1 are generated at output terminals A <B and (A <B) ^* .
The output b2 is an inverted signal of a1, and the output b1 is an inverted signal of a2.

The outputs a1, b2, a2,
The meaning of b1 is as follows. That is, when the direction is "clockwise positive", the normal positive or negative turning direction is "normal direction", and the opposite positive or negative turning direction is "reverse direction", the output a1 (terminal A > B) is normal positive direction, output b2 (terminal (A> B) ^* ) is reverse negative direction, output a2 (terminal A <B) is normal negative direction, output b1 (terminal (A <B
B) ^* ) means the reverse forward direction. The symbol “a” indicates the normal direction, “b” indicates the reverse direction, and the suffix “1”
Corresponds to the positive direction and "2" corresponds to the negative direction.

Reference numeral 22 denotes a shortcut determining circuit for determining whether or not the pointer of the compass passes through 0 ° and should take a short course. In other words, when the pointer of the compass is rotated from the previous direction T-1 to the current direction T0, if it becomes a detour in the opposite direction as it is,
A short-cut selection signal S indicating that the sign in the turning direction should be reversed is output. In the case of the present embodiment,
Although it exists as a part of the function of the comparator 21, it can be formed as an independent circuit.

Reference numeral 23 denotes a semiconductor changeover switch for selectively taking out the normal direction outputs a1, a2 and the reverse direction outputs b1, b2 generated by the comparator 21. And switch elements 24 and 25 that operate in conjunction with each other. Both switch elements 24, 2
5 normally selects the normal direction outputs a1 and a2 (upper side) of the comparator 21. When the shortcut selection signal S is output from the shortcut determination circuit 22, the reverse direction output of the comparator 21 is selected. Switches to the b1 and b2 sides (lower side).

Each of the switch elements 24 and 25 is connected to one input terminal of a two-input AND gate 26 or 27 provided to one of them, and the other input terminal of the gate is connected to the oscillation of the oscillator 28. Clock CK is input. The output of the AND gate 26 is connected to the addition input terminal UP of the reversible counter 29, the output of the AND gate 27 is connected to the subtraction input terminal DOWN of the reversible counter 29, and the output of the reversible counter 29 is connected to the D / S converter 10 described above. Is connected. When the minimum value of the repetition frequency of the clock CK of the oscillator 28 among the indicated directions D1 that may be indicated by the data processing unit 7 is input to the comparator 21, the output terminal A> B or A <B The frequency is set higher so that the frequency has a cycle shorter than the pulse width of the voltage pulse appearing in B. From the viewpoint of smoothing the movement of the pointer of the sync indicator 13 for the compass, it is preferable to set the pointer as high as possible.

FIG. 3 shows a specific configuration of the short-circuit determination circuit 22. The short-circuit determination circuit 22 includes a reverse positive direction detection circuit 31, a reverse negative direction detection circuit 32, and a NAND gate 33. L1 and L2 are signal lines of higher-order bits corresponding to 180 ° and 90 ° of the digital output value D2 of the reversible counter 29, and L3 and L4 are the digital signals given to the input terminal A of the comparator 21 as the indicated direction D1. 180
{, 90} is a signal line for higher-order bits corresponding to {, 90}.
That is, as shown in FIG.
If the signal on line L1 is at H level, the previous azimuth T-1 (counter output value D2) is changed to quadrants III and IV when the signal on line L1 is at the H level. (180
゜ or more), and when the signal on the line L2 is at the H level, the previous azimuth T-1 (counter output value D2)
Are in quadrants II, III, IV (over 90 °). When the signal on the line L3 is at the H level, it indicates that the current azimuth T0 (indicated azimuth D1) is in the quadrants II, III, and IV (180 ° or more), and when the signal on the line L4 is at the H level. Indicates that the current direction T0 (pointing direction D1) is in quadrants II and II
I, IV (over 90 degrees).

The reverse forward direction detecting circuit 31 is connected to the line L1,
The signals on L2 are taken as first and second inputs, respectively,
3 and L4 to inverters 311 and 312, respectively.
, And a NAND gate 313 having third and fourth inputs as inverted ones. Therefore, the reverse forward direction detecting circuit 31 detects the previous azimuth T- on the lines L1 and L2.
The position of 1 (counter output value D2) corresponds to quadrant IV (27
0 ° or more) and the position of the current azimuth T0 (indicated azimuth D1) is in the quadrant I (less than 90 °), an L-level output is generated, and the H-level shortcut selection signal S from the NAND gate 33 is output. Is generated.

The reverse negative direction detecting circuit 32 is connected to the line L
1 and L2 to inverters 321 and 322, respectively.
Are used as the first and second inputs, and the lines L3, L
NAND gate 32 having the signal on the fourth input as the third and fourth inputs
3. Accordingly, the reverse negative direction detection circuit 32 determines that the position of the previous azimuth T-1 (counter output value D2) appearing on the lines L1 and L2 is in the quadrant I (less than 90 °) in FIG. When the position of the azimuth D1) is in the quadrant IV (270 ° or more), an output of an L level is generated, and a short circuit selection signal S of an H level is generated from the NAND gate 33.

Next, the operation will be described.

(1) Normal Forward Direction Operation As shown in FIG. 4A, when the azimuth T-1 was previously 0 °, the D / A was sent from the data processing unit 7 of the computer 5.
It is assumed that a value D1 corresponding to an azimuth angle of 20 ° is given to the comparator 21 via the converter 8 and the A / D converter 9. At this time, the output value D2 of the reversible counter 29 is zero corresponding to the previous azimuth of 0 °, and the relationship of D1> D2 is satisfied. Therefore, the output terminals A> B of the comparator 21 and (A> B) ^* Bearing 20
, Appear as a normal positive output a1 and a reverse negative output b2. On the other hand, the short circuit determination circuit 2
2 is because the outputs of the detection circuits 31 and 32 become H level,
No shortcut selection signal S has been generated. Therefore, the switch elements 24 and 25 of the changeover switch 23 are connected to the output terminals A> B and A <B of the comparator 21, that is, the normal direction outputs a1 and a2.
Side (upper side) is selected. Therefore, only the normal forward output a1 generated at the output terminal A> B of the comparator 21 passes through the changeover switch 23 and is input to the AND gate 26.

The AND gate 26 outputs the normal positive output a.
1 and the clock C provided by the oscillator 28
K is input to the reversible counter 29. The reversible counter 29 sequentially counts the clock CK for each pulse, and the output value is counted up. This count value is passed through the D / S converter 10 each time, and the synchro indicator 1 for the compass is used.
Added to 3. Therefore, the hands of the synchro receiver 11 and the indicator 12 are displaced little by little at a fine cycle of the clock CK, and move very naturally to the corresponding indication scale position of 20 °. The content of the reversible counter 29 increases and D
When D1 and D2 match, the normal forward output a1 from the comparator 21 disappears. For this reason, the reversible counter 29 stops at the count value, and the pointer of the indicator 12 also
It stops at the indicated scale position of ゜.

(2) Normal negative direction operation Contrary to the above, under the condition that the previous azimuth T-1 was 20 °, the computer 5 provided the comparator 21 with the value D1 corresponding to the azimuth angle 0 °. Suppose. At this time, the output value D2 of the reversible counter 29 is a value corresponding to the previous azimuth of 20 °, and the relation of D1 <D2 is switched.
1, the normal negative output a2 appearing at the output terminal A <B is
The signal is guided to the AND gate 27 through the changeover switch 23. The AND gate 27 opens, and the count is subtracted by the reversible counter 29 at the clock CK. The count value of the reversible counter 29 in this subtraction process is added to the synchro indicator 13 through the D / S converter 10 each time. For this reason, the hands of the synchro receiver 11 and the indicator 12 are slightly displaced, and move very naturally to the corresponding azimuth difference 20 °, that is, the indicated scale position 0 °, and stop at that position.

(3) Reverse Forward Direction Operation Now, as shown in FIG. 4 (b), when the previous azimuth T-1 was 340 °, the data processing unit 7 of the computer 5 sends the azimuth angle 10 to the comparator 21. Assume that a value D1 corresponding to ゜ is given. At this time, the output value D2 of the reversible counter 29 is a value corresponding to the previous direction of 340 °, and D1 <D
2, the output terminals A <B,
In (A <B) ^* , the normal negative output a2 and the reverse positive output b1 appear for a time width corresponding to the azimuth difference of 30 °. on the other hand,
The shortcut determination circuit 22 generates the shortcut selection signal S when the output of the reverse rotation forward direction detection circuit 31 of the detection circuits 31 and 32 is at the L level, and accordingly, the changeover switch 23
Are the output terminals (A) of the comparator 21.
> B) ^* (A <B) ^* side, that is, reverse rotation direction outputs b1, b2
Side (bottom) is selected. Therefore, only the reverse forward direction output b1 generated at the output terminal (A <B) ^* of the comparator 21 passes through the changeover switch 23 and is input to the AND gate 26.

The AND gate 26 outputs the inverted forward direction output b.
1 to open the clock C supplied from the oscillator 28
K is sent to the reversible counter 29. The reversible counter 29 sequentially counts the clock CK for each pulse, and the output value is counted up. That is, the pointers of the sync receiver 11 and the indicator 12 are displaced in the positive direction (shorthand direction) little by little at the fine cycle of the clock CK without going in the negative direction from 340 ° to 10 °. .

On the way, when counting is performed up to the position corresponding to the azimuth 0 °, the output of the reversible counter 29 becomes “0” in all digits, and the subsequent input pulse counts “0”.
Is counted from When the content of the reversible counter 29 increases and its output value D2 matches the indicated direction D1, the comparator 21
, The reverse forward output b1 disappears. Therefore, 340
The pointers of the synchro receiver 11 and the indicator 12 that have turned in the forward direction (short-hand direction) from ゜ stop at the 10 ° scale position corresponding to the indicated azimuth D1, and the reversible counter 29 also counts the count value. Stop at.

(4) Reverse Negative Direction Operation Contrary to the above, under the condition that the previous azimuth T-1 was 10 °, the computer 5 gives the comparator 21 a value D1 corresponding to the azimuth 340 °. Suppose. At this time, the output value D2 of the reversible counter 29 is a value corresponding to the previous azimuth of 10 °, and the relationship D1> D2 is satisfied.
Output terminal A> B, (A> B) ^* to the normal positive output a1
, Reverse negative direction output b2 appears. On the other hand, in the shortcut determining circuit 22, the output of the reverse rotation negative direction detecting circuit 32 is at the L level to generate the shortcut selecting signal S. Therefore, the changeover switch 23 is the output terminal of the comparator 21 (A <B) ^*. , (A>
B) The ^* side, that is, the reverse direction output b1 and b2 side (lower side) is selected. Therefore, the output terminal of the comparator 21 (A> B)
Only the reverse rotation negative direction output b2 generated at ^* passes through the changeover switch 23, is input to the AND gate 27, and opens the gate.

The clock CK is input to the reversible counter 29 through the AND gate 27 and is subtracted by the reversible counter 29. That is, the hands of the sync receiver 11 and the indicator 12 are displaced in the negative direction (shorthand direction) little by little at a small cycle of the clock CK without going in the negative direction from 340 ° to 10 °. .

When the position is just subtracted to the position corresponding to the azimuth 0 °, all the digits of the output of the reversible counter 29 become “0”, and the subsequent input pulses are subtracted from the count value “0”. The count value of the reversible counter 29 in this subtraction process is added to the synchro indicator 13 through the D / S converter 10 each time. Therefore, the sync receiver 1
The pointer 1 and the pointer of the indicator 12 are displaced little by little, move very naturally to the indicated graduation position 340 °, and stop at that position.

In the above embodiment, the instrument surface 360 ° of the compass is considered as being divided into four sectors (quadrants I, II, III, IV), and short-distance determination elements correspond to 180 ° and 90 ° bits. Although two signals are used, the present invention is not limited to this.

On the other hand, when it is desired to obtain a more accurate short-range signal, in addition to the above 180 ° and 90 ° bit corresponding signals,
Furthermore, 45 ゜ (315 ゜) and 22.5 ゜ (337.5)
Using the bit-corresponding signal of ゜) at the same time, the sudden loss of the bit-corresponding signal of 45 ° or 22.5 ゜
Short cuts can also be detected.

The present invention can be applied to any synchro indicator rotating 360 ° or more regardless of the type of the indicator.

[0038]

As described above, according to the present invention, a clock corresponding to a pulse width corresponding to an instruction angle signal such as an azimuth created in a pseudo manner is extracted and input to the reversible counter, and the counting operation is performed by the reversible counter. Since the sequential counter value is added to the D / S converter of the synchro indicator, the hands of the synchro indicator move more smoothly than in the case where the synchro indicator operates according to the pointing angle signal.

Further, when the designated angle signal is given, the decision circuit determines whether or not the designated angle signal is a value which should make a short circuit with respect to the previous count output value. In some cases, the switch is switched to the negative output side to perform a short-distance turning, so that abnormal movement of the compass or the like different from the actual one can be prevented, and waste of movement can be eliminated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a synchro indicator system of a boat maneuvering simulator to which a buffer control device according to an embodiment of the present invention is applied.

FIG. 2 is a configuration diagram of a buffer control device showing one embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration example of a short circuit determination circuit in FIG. 2;

FIG. 4 is a diagram for explaining the operation of the buffer control device of the present invention.

FIG. 5 is a diagram illustrating the operation of the compass.

FIG. 6 is a schematic diagram showing a synchro indicator system of a conventional boat maneuvering simulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Synchro transmitter 3 S / D converter 4 D / A converter 5 Computer 6 A / D converter 7 Data processing part 8 D / A converter 9 A / D converter 10 D / S converter 11 Synchro Receiver 12 Indicator 13 Synchro indicator 20 Buffer controller 21 Comparator 22 Short circuit determination circuit 23 Changeover switch 24, 25 Switch element 26, 27 Gate 28 Oscillator 26, 27 AND gate 29 Reversible counter 31 Reversing forward direction detecting circuit 32 Reverse negative direction detection circuit D1 Indicated direction (indicated angle signal) D2 Counter output value (reference value) CK clock a1 Normal positive direction a2 Normal negative direction b1 Reverse positive direction b2 Reverse negative direction

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-20099 (JP, A) JP-A-57-75301 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09B 9/06 G09B 9/16

Claims (1)

(57) [Claims] A comparator which receives a pseudo-generated indication angle signal and obtains a comparison output according to a magnitude relationship with respect to a reference value and a negative output thereof, and changes the output of the comparator from a normal comparison output to a negative output A switch for switching, a gate which is opened by an output from the switch and passes a clock from an oscillator, and adds or subtracts a clock from the gate, and sequentially counts the count value to a reference input of the comparator and a synchro indicator. A reversible counter as an input to the D / S converter, and determining whether or not the indicated angle signal is a value that should approach the previous count output value when the indicated angle signal is given,
A determination circuit for switching the switch from the normal comparison output of the comparator to the negative output when the result of the determination is short-circuiting;