JPH0633395Y2 - Belt slip detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a belt slip detection device used in a mechanism for transmitting a rotational driving force from a crank pulley of an internal combustion engine via a belt to a compressor pulley of an air conditioner, for example. .

[Prior Art] When driving an air conditioner using the output of an internal combustion engine in an automobile or the like, a driving force is generated by spanning a belt between a crank pulley on the internal combustion engine side and a compressor pulley on the air conditioner side. Is transmitted. In such a transmission device, the compressor pulley is loaded, and slippage may occur between the belt and one or both pulleys. When slip occurs, inconveniences occur such that abnormal noise is generated from the transmission mechanism and transmission efficiency is reduced.

In order to analyze the slip that causes such a problem, there is known a device that detects the number of revolutions of each pulley and compares the number of revolutions to detect the slip ratio.
No. 97561, No. 57-112249, Shoukai).

[Problems to be Solved by the Invention] These conventional techniques merely compare the rotational speeds of the driving side pulley and the driven side pulley. Therefore, if the rotation speed ratio of the two pulleys is different from the rotation speed ratio in the non-slip state, it can be understood that slip has occurred between the pulley and the belt. However, it is unknown which of the two pulleys slips to the belt and to what extent. For this reason, it was not possible to provide sufficient analysis data for measures to improve pulleys and belts.

It is an object of the present invention to provide a device for detecting an accurate slip state between each pulley and a belt in the above rotary drive force transmission mechanism.

[Means for Solving the Problems] The belt slip detecting device of the present invention made to achieve the above object is, as illustrated in FIG. 1, a driving side pulley M1, a driven side pulley M2, and the driving side pulley M2. Rotational driving force transmission including a driving force transmission belt M3 bridged between the side pulley M1 and the driven side pulley M2, and an idler pulley M4 for adjusting the tension of the driving force transmission belt M3 A belt slip detecting device in the mechanism, comprising first rotation detecting means M5 for detecting a rotational state of either the driving side pulley M1 or the driven side pulley M2, and a first rotation detecting means for detecting a rotational state of the idler pulley M4. The two-rotation detecting means M6, the pulley on either the driving side pulley M1 or the driven side pulley M2 in the non-slip state, and the idler pulley.
Relationship between rotation state with M4 and above two rotation detecting means
By comparing the relationship between the two rotational states detected by M5 and M6, the slip state between either the driving side pulley M1 or the driven side pulley M2 and the driving force transmission belt M3 is detected. The slip state detecting means M7 for

[Operation] Since the idler pulley M4 has no load, the idler pulley M4 does not slip between the idler pulley M4 and the driving force transmission belt M3 which is in contact with the idler pulley M4, so that the rotation corresponding to the movement amount of the belt M3 is always performed. There is. Therefore, the second rotation detecting means M6 detecting the rotation state of the idler pulley M4 accurately reflects the movement state of the belt M3.

Therefore, actually, the detected value of the first rotation detecting means M5 and the second value
Comparing the corresponding state with the detection value of the rotation detecting means M6 to the corresponding state obtained when slip is completely absent, what slip state is any pulley M1, M2 and belt M3 in? Prove.

[Embodiment] Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 shows the overall configuration of a belt slip detecting device as an embodiment of the present invention.

This device mainly comprises a data measuring device 1 and a data processing device 3. The rotational driving force transmission mechanism to be measured includes a crank pulley 7 attached to a crankshaft 5 of an internal combustion engine mounted on an automobile, a compressor pulley 11 attached to a compressor driving input shaft 9 of an automobile air conditioner, It is composed of a driving force transmission belt 13 spanned between the pulleys 7 and 11, and an idler pulley 15 for adjusting the tension of the belt 13.

The data measuring device 1 receives the pulse signals from the rotation angle sensors 17, 19 and 21 for detecting the rotation states of these pulleys 7, 11 and 15 and sequentially outputs the rotation states of the pulleys 7, 11 and 15 Have accumulated as.

The rotation angle sensors 17 to 21 are attached to the rotary shafts of the pulleys 7 to 15 and rotate with the pulleys 7 to 15 to form a slit disk.
17a, 19a, 21a and the signal output unit 17b, which outputs a pulse signal according to the on / off of the light by detecting the light emitted from one side of this slit disc 17a to 21a on the other side.
It is composed of 19b and 21b. Slit disk 17a-21a
A slit having a width of 3 ° is formed at every rotation angle of 3 ° over the entire circumference of the portion located in the signal output portions 17b to 21b. Therefore, every time the pulleys 7 to 15 are rotated by 3 °, the signal output sections 17b to 21b switch the light transmission / blocking state. Therefore, when the pulleys 7 to 15 rotate, the rotation angle sensors 17 to 21 output pulse signals having a waveform corresponding to the rotation angle of 3 ° to the data measuring device 1.

The data measuring device 1 includes a clock circuit 23, three counter circuits 25, 27, 29, three data storage units 31, 33, 35, and a start switch 37.

The clock circuit 23 is mainly composed of a high frequency generating circuit and a frequency dividing circuit thereof, and is a circuit which outputs a clock pulse at a predetermined time interval. Each counter circuit 25 to 29 is composed of a logic circuit, a flip-flop circuit, etc., and starts counting the number of clocks from the clock circuit 23 at the rising (or falling) timing of the pulse signals from the rotation angle sensors 17 to 21. , At the next fall (or rise) timing, after outputting the count value to each of the data storage units 31 to 35, the held count value is cleared and counting is started from the beginning. This operation is repeated while the power is on.

For example, when a pulse signal as shown in FIG. 6 is output from each of the rotation angle sensors 17 to 21, as shown by the parentheses in the figure, the duration of the high level H or the low level L is from each counter circuit 25 to It is counted and output at 29.

Each data storage unit 31-35 is configured as a computer,
Mainly CPU31a, 33a, 35a, ROM31b, 33b, 35b, RAM31c, 33c, 35
c, 1 / F (interface) 31d, 31e, 33d, 33e, 35d, 3
It is composed of 5e.

On the other hand, the data processing device 3 is also configured as a computer, and is mainly configured by a CPU 3a, ROM 3b, RAM 3c, and 1 / F (interface) 3d, 3e, and C as an auxiliary device.
It is composed of an RT 39, a keyboard 41, and a disk auxiliary storage device 43.

Each of the data storage units 31 to 35 and the data processing device 3 has its ROM 3
3rd according to the program stored in 1b, 33b, 35b, 3b
~ Any one of the processes shown in FIG. 5 is performed. By this process,
The data storage units 31 to 35 sequentially store the values counted by the counter circuits 25 to 29 and output the data,
The data processing device 3 receives the data, performs comparison processing, displays the result on the CRT 39, and the disk auxiliary storage device 4
Record in 3. Of course, a printer may be connected to the data processing device 3 to print out the result.

Next, detailed processing contents of the data storage units 31 to 35 and the data processing device 3 will be described. First, the processing executed by each of the data storage units 31 to 35 will be described. This process is executed independently for each data storage unit 31-35,
Since the processing itself is the same, one data storage unit 31 will be described as a representative.

When the process is started by turning on the power, it is first determined whether or not there is a data collection instruction (step 110). In this determination, when the start switch 37 is turned on, it is determined that there is an instruction, and until then the instruction is awaited. When the start switch 37 is turned on, it is next determined whether or not the pulley 7 has rotated 3 ° (step 120). In this determination, when the level of the pulse signal from the rotation angle sensor 17 changes (rises or falls), it is determined that the rotation angle is 3 °.

If the level of the pulse signal has changed, the count value output from the counter circuit 25 is read and sequentially stored in a predetermined array in the RAM 31c (step 130). At this time, the values (corresponding to the time from the start of measurement) of the timer counters built in the respective I / Fs 31d to 35d, which have been counted up after the data collection instruction, are also stored in the array as a set. For example, as shown in FIG. 7 (A). Here, the numerical value without parentheses represents the value (time) of the timer counter, and the numerical value with parentheses represents the output value of the counter circuit 25 (time of pulse high level H or low level L).

Next, it is determined whether or not the stop signal is output (step 140). The stop signal is a signal transmitted from the data processing device 3 side and received via the I / F 31e. If the stop signal is not detected, it is determined whether or not there is an empty area that can be stored in the array of the RAM 31c (step
150). For example, if the number of elements is an array of 1200 sets, if the 1200th data is stored in the process of the immediately preceding step 130, a negative determination is made here and the process proceeds to the next step 160, but it is still 1200 If not, step again
Returning to 120, the process of reading and storing the count value is repeated every 3 °. Of course, step 140 without reaching 1200
If it is detected that the stop signal has been input in, the data accumulation process ends.

When 1200 pieces of data are accumulated and it is determined in step 150 that there is no free area, a completion signal indicating that the measurement is completed is output to the data processing device 3 via the I / F 31e (step 160). ). This completion signal is a signal for instructing the other two data storage units 33, 35 so that the data processing device 3 outputs a stop signal.

Next, it waits for a data output instruction signal from the data processing device 3 (step 170). When this signal is input from the data processing device 3 side, the data storage unit 31 sequentially sends the array data of the accumulated count values to the data processing device 3 (step 180). In this way, the process returns to step 110 again.

Next, the processing of the data processing device 3 will be described with reference to FIG.

When the process is started by turning on the power, it is first determined whether or not the completion signal is output from any of the data storage units 31 to 35 (step 210). If the signal is output, the stop signal is output to the data storage units other than the data storage unit that output the completion signal (step 22).
0). In this way, the processing of all data storage units 31 to 35 is once terminated.

Next, the data output instruction signal is output to the first data storage unit 31, and then the data storage unit that has detected the signal
The array data sent from 31 is read and stored in the RAM 3c and the disk auxiliary storage device 43 (step 230).
Subsequently, the same processing is executed for the second and third data storage units 33 and 35 to store the array data (step
240,250). A part of the sequence data is shown in FIG.
It shows in (C).

Next, a slip ratio calculation process is executed as described later (step 260), and the result is displayed on the CRT 39 as a timing chart and a slip ratio value (step 270).
Thus, the process returns to step 210 again.

The slip ratio calculation process of step 260 will be described with reference to the flowchart of FIG.

First, based on the time data of the crank pulley 7 shown in (A) of the data array obtained as shown in FIGS. 7 (A) to (C), the time data of (B) close to the time is obtained. Then, the time data of (C) closer to the time is searched from the time data of (B) (step 261). For example, the time of the first data in FIG. 7 (A) is "10". For the data of (B) close to this time, the time having the smallest difference may be selected, and “7” corresponds. Further, the time in (C) closest to "7" in (B) is "5". However, if there are two closest times, the earlier time is selected.

Then, the slip ratio is calculated using the time data (T1, T2, T3) respectively combined with the time data thus combined. Of course, the arrangement data of (C) is considered as the arrangement data of the belt 13.

Let p be the diameter ratio of each pulley 7 to 15 that is found by actual measurement.
When 1: p2: p3, the slip ratio Sp1 between the crank pulley 7 and the belt 13 is calculated as in the formula (1), and the slip ratio Sp2 between the compressor pulley 11 and the belt 13 is calculated in the formula (2).
Is calculated as follows.

If p1: p2: p3 = 10: 8: 5, the first data, that is,
Substituting T1 = “20”, T2 = “16”, T3 = “10”, the value of equation (1) becomes “0” and the value of equation (2) also becomes “0”. That is, the first data shows that the slip does not occur between the crank pulley 7 and the belt 13 and further between the compressor pulley 11 and the belt 13.

In this way, the first slip ratio calculation process is executed, and the slip ratio data is stored in the RAM 3c and the disk auxiliary storage device 43.
(Step 263).

Next, it is determined whether or not there is the next data of the crank pulley 7 (step 265). If there is, the processing of steps 261 and 263 is repeated again, and the slip ratio is calculated and stored.

The combination of the time data thus obtained is shown by a dashed arrow in FIG. For example, the time of the data of FIG. 7 (A) which is the next search criterion is "30". The other two time data retrieved are “23” in (B) and “27” in (C). At this time, the value of the equation (1) is “0.0227” and the value of the equation (2) is “0.244”. Therefore, it is understood that the slip occurs between the crank pulley 7 and the belt 13 and further between the compressor pulley 11 and the belt 13. Moreover, it can be seen that the latter slip is larger.

When the processing for the time data of all the crank pulleys 7 is completed in this way (step 265), the 7th data is displayed on the CRT 39.
A timing chart as shown in FIG. 6 is displayed based on the data shown in FIG.
At the corresponding position of each high level and each low level of the crank pulley 7 and the compressor pulley 11, the above step 260
Write and display the slip ratio obtained in step (step
270). Of course, since the amount of display of the screen of the CRT 39 is limited, the screen display may be switched or the screen may be scrolled left and right by operating the scroll key provided on the keyboard 41.

Since the present embodiment is configured as described above, the crank pulley 7 is also provided in the transmission mechanism in which the driving force is transmitted from the crankshaft 5 by the belt 13 to the compressor driving input shaft 9 as in an automobile air conditioner. The slip state between the belt 13 and the belt 13 and the slip state between the compressor pulley 11 and the belt 13 are individually accurately determined, and the data can be used for analysis of occurrence of abnormal noise.

In this embodiment, the data was once collected by the data measuring device 1 and sent to the data processing device 3. However, by directly inputting the pulse signals of the rotation angle sensors 17 to 21 to the data processing device 3, You may make it detect the rotation state of the pulleys 7-15. Specifically, the time at the time of the interrupt may be measured by the interrupt processing started at the rising or falling of each pulse signal, and the time may be stored in the array of the RAM 3c in the data processing device 3. . This array is the array data of only the time among the array data of FIG. 7, but the time data can be treated as the data equivalent to the array data of the above-mentioned embodiment because the difference between adjacent time data can be calculated.

[Advantage of the Invention] The belt slip detector of the present invention detects the rotation state of the driving force transmission belt M3 by the rotation of the idler pulley M4 for tension adjustment. The idler pulley M4 is in an unloaded state, and there is almost no slip with the belt M3.
Therefore, since the rotation state of the idler pulley M4 can be treated as the data of the belt M3, by comparing the rotation state of the idler pulley M4 with the rotation state of any of the other pulleys M1 or M2, the belt M3 and the pulley M1 or M2 are compared. It is possible to detect the slip state during the period.

Therefore, the slip state between the pulley M1 (or M2) and the belt M3 can be obtained as accurate data, which can be used for analysis of the driving force transmission state in the rotary driving force transmission mechanism.

[Brief description of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the overall configuration of a belt slip detecting device as an embodiment, FIG. 3 is a flow chart showing the processing of a data storage unit, and FIGS. Is a flow chart showing the processing of the data processing device,
FIG. 6 is a timing chart of a pulse signal output from each rotation angle sensor, and FIG. 7 is an explanatory diagram of a data array stored in the data storage unit. M1 …… Drive side pulley, M2 …… Driven side pulley M3 …… Drive force transmission belt M4 …… Idler pulley, M5 …… First rotation detection means M6 …… Second rotation detection means M7 …… Slip state detection Means 1 ... Data measuring device, 3 ... Data processing device 7 ... Crank pulley, 11 ... Compressor pulley 13 ... Driving force transmission belt 15 ... Idler pulley 17,19, 21 ... Rotation angle sensor

Claims (1)

[Scope of utility model registration request] 1. A driving-side pulley, a driven-side pulley, a driving-force transmitting belt spanned between the driving-side pulley and the driven-side pulley, and tensions of the driving-force transmitting belt. A belt slip detection device in a rotation driving force transmission mechanism including an idler pulley to be adjusted, comprising: first rotation detection means for detecting a rotation state of either the drive side pulley or the driven side pulley; A second rotation detecting means for detecting a rotation state of the idler pulley; a relation of a rotation state between the idler pulley and the drive side pulley or the driven side pulley in a non-slip state; By comparing the relationship between the two rotation states detected by the two rotation detecting means, either the drive side pulley or the driven side pulley and the driving force transmission bell are compared. Belt slip detecting device, characterized in that it and a slip state detecting means for detecting a slip condition between.