JPS5863858A - Measuring device for revolving speed - Google Patents

Abstract

PURPOSE:To count up revolving speed even at the reduction of the revolving speed by previously setting up the maximum time starting at the same time as the start of the measurement of the revolving speed, and when no rotation pulse is outputted during said time, forcedly turning the measured revolving speed to ''0''. CONSTITUTION:At the depression of a measuring switch 2, a control part 4 receives the counted contents of counters 9, 10, and after recognizing the passage of a fixed time T0 from the starting of operation through said counted contents, transfers the counted contents of the counters 5, 6 to a register 7 by the rise of the initial rotation pulse 1'. Subsequently the control part 4 clears up the counters 5, 6 and also the counters 9, 10 are cleared up and start again their counting from the rotation pulse 1'. When the maximum time Tmax has passed after passing the time T0 because of the reduction of the revolving speed, the registered value of a displaying register 13 is forcedly turned to ''0'', ''0'' is displayed on a display device 14, and respective counters 5, 6, 9, 10 and registers 7, 11 are cleared up.

Description

[Detailed description of the invention] The present invention relates to a rotation speed measuring device.

To measure the rotational speed, count the pulses of the rotational path M whose frequency is proportional to the rotational speed over a period of time T, and divide the counted value n by the time T. In this case, set an arbitrary reference time T. If the first pulse is generated after this base * A method in which the time T and the number of pulses nJl up to that point: 9 and the number of revolutions are calculated and measured has been proposed separately.

Figure 1 explains the measurement principle and shows the rotational pulse Ph (generated at a frequency proportional to the rotational speed of the object to be measured, and is generated at a time T after the start of counting L).

After passing IJ, count the time T at the first rotational pulse (rn + 1st) and the number of pulses at that time, and perform the operation Find the required number of rotations and add K. According to the standard method, it is convenient to use a gauge head of 75 f with unusually high accuracy over a wide range from low speed rotation to high speed rotation.

By the way, according to the measurement method IC proposed by IJ, 2 hours To
The time difference ΔT of one stroke time is constant, and the time difference ΔT varies depending on the number of rotations.The time difference ΔT for one stroke becomes shorter when the rotation speed is high, and becomes orange-red when the rotation speed is low.For example,
Using a rotating pulse generator that generates 0 pulses -F;
In case A, the period of the rotation pulse is 10 seconds when rotating at a low speed such as 0.1TiPM. If the time TO
Rotation number inside! Decrease to about OIPPM level and 31%
t, time T.

After 10 seconds have elapsed, the force and measured rotational speed will not change at all.This means that depending on the change in rotational speed, a total of 4 rivers or 6 rotational speed display cloths will be expected. 'fx
-It's going to happen.

This invention reduces the number of rotations (reduced by 1.) and also increases the number of sales per cycle by increasing the number of rotations (I) from rl-6111 to fin +li 11 Table 7
11 E songs li kr-J-ノ) for the purpose of this.

This invention sets the maximum time T'maχ in advance at the same time as the rotational speed d(side and ti).After 1 hour T., the maximum time Tm□ is set to +1lll-r RV.
Deni.

The rotation pulse≠I indicates that no rotation pulse is generated, and the measured rotation speed is universally changed to "07." and -F.

The measurement principle according to the present invention is explained in Fig. 2.
4-F [Pulse J] with a frequency proportional to one revolution] is counted at the start of measurement, and the response to the standing force (response to the first rotational pulse Cn-th pulse after a certain period of time To'&-) Pulse &n, read the time T with -F and start the next measurement from this pulse, read *n, set T to n/T, calculate fr≠5, and rotate. Read the number.In addition, when performing measurement X in this way, the (n + 1)th rotation pulse as shown in Figure 1 is unnecessary, and the measurement is possible when the rotation measurement is ≠ 1. The time is also shortened by one pulse = 1. This makes it more convenient. In this invention, after the time T has elapsed from the start of measurement, the preset maximum time Tmax (
However, since not a single rotational pulse sparrow was generated until 'I'mayo > TO), the measured rotational speed of 6 was set to 0. , and the display on the display will also be set to 07°. In this way, even if the rotating object to be measured ≠ continues to rotate and is closed to b-#, the number of rotations is considered to be below the range of rotations to be measured, and the number of rotations is ``O, 2 rotations and 12 At the same time, the nth pulse sparrow held the measured rotational speed of Ai for a long period of time until it changed to 1 ham, or 1 l-1-t, and reached 17.
- You can display the same rotation number up to b'f! The layer and (8 or not Zl< combination are times 11FF+S≠(f'Ik).

1. Tasuzume is 1 sheet, 2 lights, and 2 lights. The figure is a functional block diagram, ] 11 rotations;
A pulse with a frequency proportional to the number of stickers is set using a constant Cow-Tom rotating pulse generator, and the Xl side switch is operated when measuring 2 digits.

For use in oscillation of 3-digit constant frequency pulses, FA oscillation, 4-digit programs, etc. (eight control 1 (-5 is counting rotation pulses + counter 4.6)?A cow lO from AM etc. is RA
A counter from M etc., a 1-digit register from RAM etc., a 12-digit arithmetic unit, a 13-digit register for table ID, a %14-digit display.

The rotational pulses from the above bark generator are counted by counter 5 (binary counter 1). Then, the carry output of this lever is given to the counter 6, and the content value of the counter 6 is incremented. As a result, the counter 5 counts the lower digit of the rotation pulse, and the counter 6 counts the tenth digit, so that the counter 5.6 counts ``alpha1tt'' and counts 4 pulses Ln, J. Counter5.
Counting is done by a sufficiently thick can with a counting capacity of 6 and 5 (if the counter is sufficiently responsive to input pulses, one counter may be omitted), and its carry output is counted by the counter]0. Sent to. In this case, the counters are the same as the main counters 5 and 6 (counter 9 stores the lower digits, counter lO
The upper digits are set to count -F, and the clock pulse count is executed by multiplying the count 6M of both counters by bF.

As soon as the measurement switch 2 is operated to start measurement, the control section 47'lS starts operating and starts a predetermined program. , 9. l0 VC starts the A count operation.Then, the control unit 4 receives the count contents of the counters 9 and 10, and from this, knowing that a certain period of time To has elapsed since the start of the m11 operation, the control unit 4 starts counting. Due to the rise of the first rotational pulse 1', the control unit 4 starts programming.
#≠S, the count contents of counter 56 are stored in register l'
# send to 712. After that, clear winter counters 5 and 6,
Also, the same 1-(transfers the count contents of counters 9 and 10 to register] 1.

Then each counter 9,1. Of clear iR6 17', t counter 5 times III/So(Msu)'
Start round count from counter 9 &:j times IK
/3 pulses] From the standing 1/sparrow, start the Klotzbales force again.

Next, I created a 4-digit program for the control section, and each register '7. ], the contents n and T of l are transferred to the calculation unit 12, where n/T is calculated. The result of this performance 11 is registered in the display register 13 and displayed on the display 4.

This display continues until the next measurement registers a new value of n/T in the register 13 for displaying the value of n/T. Measure this below with switch 2≠! Manipulated L/ song repetition-t
0 As can be understood from the following explanations, the
The output contents of each counter 5, 6, 9, and 10 are transferred to register 7, ]1 by the rising of A, and are then cleared. The force Ao is a pulse; therefore, the (n and a half)th rotational pulse after the nth I] rotational pulse is not required at all.

The above explanation is based on the normal case of force S, where the rotational value of an ax is reduced during measurement time T, and therefore, after the time To is fit, the maximum time Tmaχ has elapsed. Rotation pulse by + O - / + 1
Suddenly, the control unit's 4-digit counter 9.
The receiver receives the count contents of 10, and from this, it knows that the maximum time Tma has elapsed after the start of operation. // , and the value displayed on the display 14 is increased to O,,. Also, clear each counter 5, 6, 9, 10, and register 11.

As shown in FIG. 3, it is possible to utilize the microprocessor in the F configuration. The configuration is shown in Figure 4 of AK.

In the figure, 15 indicates a microprocessor.

Figures 5 to 7 & t H+F. Wait 2 for the mode flag in the same figure. The first synchronized pulse sparrow occurred - the interval on F control was 1 hour T□. Get more benefits from engineering.

Total 71111,,ke1jimonT. Between cl “1
d,, i'1' time T.

? The next rotational pulse after J-key]'≠τl te 4 represents each state between 4 and 3 to the father completion flag (at 8, t< pv reply completed 7. , time Tn I'J,
(1. During time Tmazi, rotation pulse ≠ X occurrence I
J-Ll, ~, time complete 7. Toke 1 temple listening T. After that, during the time 'J' maz dimension, the rotation pulse ≠(occurred? When the rotation pulse rises, an interrupt of 12 seconds is generated by reading the timer interrupt counter 9's output as an interrupt.

After turning on the power, MY)YR CORPORATION is displayed.
Real f'T' from the start address of the routine? open bit-t-
7,. As shown in FIG. 5, the 3pt routine initializes A/-chin to Wf-? L, hardware, FIA
Initializes the contents of λ4, etc. Clear the completion flag, wait for the mode flag, Iysf7. Mark the state of l1, and mark the waiting state of the first rotation pulse [1j VC-
tfu. After that, enable timer interrupts, pulse interrupts, etc.

After that, check the contents of the completion flag and confirm that the pulse is complete.
, clear the completion flag 11, calculate n/T, fz I<, and output the result f. Honshi time complete 7
．． If so, clear the completion flag and set it to 0. .

Outputs the following. After that, if the above-mentioned step 1 is not performed, the process jumps to the routine for checking the contents of the completion flag again at t8, and repeats the process.

The pulse interrupt routine 'ft is shown in FIG. If this could be interrupted by the rising force of the rotational pulse, what is actually required is the interruption force when the first rotational pulse occurs or at the first time after 1 Terama To. Since there is only one rotational puffless occurrence (this is also the first generation part of the first rotational pulse of the next total/1il1 period 1111), enabling or disallowing the interrupt depends on the timer interrupt to be suppressed next. control routines etc.

When the pulse interrupt routine is activated, the time counter (counters 9 and 10) and pulse counter (counter 5)
．． 6) Read out 4 of 1-7, and other places (Shizistav, Yu 1)
) is stored, reset each counter. After that, if the content value of the mode flag indicates the length of the error claw, complete 7 = y is marked as "pulse complete 7."
debt. + Therefore, normal termination processing is performed using a pulse for one measurement period. After that, the mode flag is marked as 7111I, 7 in total, indicating a new measurement period. Thereafter, in the timer interrupt routine, the time To is reached, and at bl, a declaration is made that the pulse interrupt is not punchable so that the bafflef interrupt sequence -HLWE will not be activated.

FIG. 7 shows the timer interrupt loop. This is the incrementation of a time counter inside the microprocessor.

Manage your time. When this≠I is started, first the time counter≠(step-t-f). Then, depending on the state of the mode flag, select the 61st clock to be managed - FA. In other words, "measurement 7. 4≠(Time T. Determine if it is longer than 7-'f!, then change mode 7-9 to extension 2., and at 1f, pulse split in preparation for the first rotational pulse of the agent after JITO. The state of the mode flag is e light am, the negative time is [17 power unta 6 hours Tm
Judging to be african with 10 and 7'5
Wait for 5. to complete the measurement period, and set the completion flag to ``Time complete, mark 7 +A.'' As detailed above, according to the invention, the rotation speed was low. In this case, how long should the measured rotational speed be adjusted to 6, and if the rotational speed is below the measurement target range, 1. ? The -1-ft11 rotational speed is set to 0.7, and an effect is produced in which the fr value corresponds to the actual rotational speed and is equal to the measured rotational speed and -F Fukoto≠;.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conventional measuring method, Fig. 2 is an explanatory diagram of the measuring method according to the present invention, Fig. 3 is a functional block diagram of the present invention, and Fig. 4 is an illustration of an embodiment of the present invention. Yofu block diagram,
5 to 1 are flowcharts. 1. Cloud --- Rotating pulse generator, 2. ,...-Measurement switch, 4...--Control 'A+ (,5, 6...--Counter for rotation pulse,]...Register 4.910
... Counter for clock pulses, 11 ... Lee register, 12 ... Performance XH<, 15 ... Microprocessor patent applicant Shinpo Kogyo Co., Ltd. -

Claims (1)

[Claims] A rotation pulse generator that generates rotation pulses with a frequency proportional to the number of rotations, a ten counter that counts the conversion pulses, a sufu counter that counts clock pulses, and a rotation pulse generator that generates rotation pulses with a frequency proportional to the number of rotations. A first rotation pulse calculates the measured rotation number from the rotation pulse number n and time T by both counters from the start of measurement + non-operation part;
A rotational speed measuring device comprising: a control unit that sets the measured rotational speed to zero if the rotational pulse is generated within a predetermined time after the predetermined period of time has elapsed.