JPH09257613A - Detector for torque of auxiliary machineries for belt transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and inexpensively detect total torque of a plurality of auxiliary machineries in a belt transmission device driving the machineries with one belt. SOLUTION: A rotating speed sensor 50 is provided on a rank shaft pulley 6. Rotating speed is detected with a electromagnetic pickup on an idler pulley 10. And a total auxiliary machinery torque detector (total torque detector) 400 calculates the total torque of a belt transmission on the basis of a ratio of the rotating speeds W1, W2 of the crank shaft pulley 6 and the idler pulley 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine auxiliary machine torque detecting device, and more particularly, to driving a plurality of auxiliary machines via a series of belts and detecting a total torque of the plurality of auxiliary machines to detect the engine. The present invention relates to an accessory torque detection device that can feed back to operation control.

[0002]

2. Description of the Related Art In recent years, in an internal combustion engine mounted on a vehicle such as an automobile, auxiliary equipment such as a compressor of an air conditioner for a vehicle, a hydraulic pump of a power steering, an alternator, a cooling fan for a radiator, and the like are installed in the internal combustion engine. A crankshaft pulley provided on the crankshaft is driven simultaneously through a series of belts.

Then, for example, the total torque of two auxiliary machines whose auxiliary machine torques fluctuate depending on usage conditions such as a compressor of an air conditioner and a hydraulic pump of a power steering, and the total torque of all these auxiliary machines are accurately measured. If so, the idle speed can be controlled with higher accuracy, the idle speed can be suppressed even lower, and the automatic transmission control can be made more precise and the shift change can be performed. Can be made smoother.

[0004]

However, in recent years, in which the number of auxiliary machines installed is increasing, in a case where a plurality of auxiliary machines are simultaneously driven through such a series of belts, for example, as described above, To measure the total torque of the air conditioner compressor and power steering,
It may be possible to measure the auxiliary machine torque of each auxiliary machine, but the cost increases due to an increase in the number of auxiliary machine torque detection devices and a complicated system.

Therefore, the present invention is to provide an accessory torque detecting device for detecting a total torque of a plurality of accessories at low cost in a case where a plurality of accessories are driven by a series of belts.

[0006]

In other words, according to the study by the present inventors, in the case where a plurality of auxiliary machines are simultaneously driven through a series of belts, the rotational speed of the drive shaft pulley and other idler pulleys ( 10), or the rotation speed of the accessory pulley, was found to be closely related to the total torque of the accessory.

The principle by which the present inventor has derived this relationship will be described below with reference to FIG. For convenience of description, a belt transmission device including two pulleys, a drive pulley 100 and a driven (auxiliary) pulley 200 will be described. Now, assuming that the drive pulley 100 is being driven, the tension distribution of the belt 300 is shown by the width of the belt in the figure (the part where the line is drawn). Further, the tension on the tension side located below in the figure is T1, and the tension on the loose side is T2. Then, of the portions in contact with the driven pulley 200 and the belt 300, the angle θ-φ, that is, the portions C to B in the figure are the same as the tension T2 on the loosening side.

In other words, power is transmitted in the portions A to C in the figure, and the driven pulley 200 slides with respect to the belt 300 with a delay. Further, in the portions C to B in the figure, the belt 300 and the driven pulley 200 are rotating together. Then, when the transmission horsepower (hereinafter, auxiliary machine torque) increases, parts C to B in the figure disappear, power is transmitted on all contact surfaces between the belt 300 and the driven pulley 200, and the auxiliary machine torque is increased. When it becomes larger, the tension T1 becomes larger, and the tension T2 becomes smaller, and as the accessory torque becomes larger, the difference between T1 and T2 becomes larger.

Then, the driven pulley 200 and the belt 300
A slip occurs between the slip and the slip, and this slip can be divided into a normal slip and an elastic slip.
That is, when φ> θ, the auxiliary machine torque increases and the belt 3
00 and the driven pulley 200 are all in contact with each other when power is transmitted, which is called normal slip. Also, θ
In ≧ φ, in the portions A to C where the tension changes, the driven pulley 200 slips with a delay with respect to the belt 300, and this slip is called elastic slip.

It is generally considered that such a belt transmission device is operated in a state where elastic slip is occurring unless an excessive accessory torque is generated. That is, it can be said that when the auxiliary machine torque increases, the difference between T1 and T2 increases and the delay of the driven pulley 200 with respect to the belt 300 increases. On the other hand, also in the drive pulley 100, the angle θ′-
φ ′, that is, the portions G to F in the figure are the same as the tension T1 on the tension side. In other words, power transmission is performed in the portions G to H in the figure, and in this portion, the belt 300 drives the drive pulley 100.
I'm slipping against me. Further, in the portions F to G in the figure, the belt 300 and the drive pulley 100 are rotating together.

Then, in such a belt transmission device, the accessory torque (Trq) is expressed by the following mathematical expression 1.

[0012]

[Mathematical formula-see original document] Trq = R1. (T1-T2): R1, radius of drive pulley Further, letting K be the elastic constant of the belt 300, ε1 and ε2 be the strain on the tension side and the strain on the slack side, the following is further obtained: Expressions 2 and 3 are related.

[0013]

(2) T1 = K · ε1

[0014]

## EQU00003 ## T2 = K.epsilon.2 In the belt transmission device shown in the figure, in the steady rotation state (state of elastic slip), the following relational expression is established by the law of conservation of mass. That is, the mass passing the point D in the unit time = the mass passing the point E in the unit time, the linear density of the belt when the belt 300 has no tension is ρ
When the tension is 0, the length of the tension side of the belt 300 is (1 + ε1) times, and the linear density is ρ0 / (1 + ε1).
become.

Similarly, when the tension is T2, the length of the belt 300 on the loose side is (1 + ε2) times, and the linear density is ρ0 (1 + ε).
2) Therefore, the above relational expression is ρ0 / (1 + ε1)
V1 = ρ0 (1 + ε2) · V2, which is transformed to V1 / V2 = (1 + ε1) / (1 + ε2).
In other words, the speed of the belt 300 increases by the amount that it is stretched,
If this is further modified, Equation 4 is obtained.

[0016]

## EQU00004 ## V1 / V2-1-1 = (. Epsilon.1-.epsilon.2) / (1 + .epsilon.1) = (. Epsilon.1-.epsilon.2), (assuming .epsilon.1 is sufficiently smaller than 1). Then, the accessory torque Trq = R1 · (T1−T2) = R1 · K (ε1−ε2) = R1 · K (V1 / V2-1), and the accessory torque Tr
There is a linear relationship between q and the belt speed ratio V1 / V2.

Then, the above-mentioned accessory torque Trq = R1.K
(V1 / V2-1), but in this equation (V1
/ V2-1) is transformed into (V1-V2) / V2, and this speed difference V1-V2 increases as the auxiliary machine torque increases and the delay of the driven pulley 200 with respect to the belt 300 increases as described above. growing. Therefore,
(V1-V2) / V2 is the driven pulley 200 and the belt 3
It can be considered as a slip ratio in the elastic slip with 00, and as a result, it is considered that the accessory torque Trq has a linear relationship with the slip ratio. Similarly, it can be considered as a slip ratio between the drive pulley 100 and the belt 300.

Therefore, if the speeds V1 and V2 are known, the correlation with the accessory torque Trq can be known, which can be understood as follows. For example, if an idler pulley is provided on the loose side of the belt 300, the idler pulley will rotate together with the loose side of the belt 300, assuming that the accessory torque is 0.
If w1 is known, V1 (R3 · w1 where R3 is the radius of the idler pulley) is known. Further, for example, if an idler pulley is provided on the tension side of the belt 300,
Since the belt 300 rotates together with the tension side of the belt 300, V2 (R4.w2 where R4 is the radius of the idler pulley) can be known if the number of revolutions w2 of the idler pulley is known. As a result, if an idler pulley is provided, V
1 and V2 will be known.

Further, (V1-V2) / V2 can be considered as a slip ratio between the drive pulley 100 and the driven pulley 200 in the above-described elastic slip state. That is, as described above, in the elastic slip state, V1 is the rotational speed of the drive pulley 100, V2 is the rotational speed of the driven pulley 200, and the drive pulley 100 and the driven pulley 20 are the same.
There is a correlation between the rotation speed with 0 and the accessory torque.

Further, the rotational speeds V1 and V2 are V1 = R1.W1 and V2 = R2.W2, where W1 is the rotational speed of the drive pulley 100 and W2 is the rotational speed of the driven pulley 200.
And the auxiliary machine torque Trq = R1 · K ((R1 / R2)
・ (W1 / W2-1)).

As a result, since R1 and R2 are fixed values, the accessory torque Trq has a linear relationship with the rotational speed ratio (difference in rotational speed) between the drive pulley 100 and the driven pulley 200. Then, based on such an idea, in a belt transmission device as shown in FIG. 2, in which a plurality of accessories 101 to 104 and an idler pulley 105 are driven by a series of belts 300 by a drive source (drive pulley 100). As shown in FIG. 3, if the rotational speed W0 of the drive pulley (for example, the crankshaft pulley of the engine) 100 and the rotational speed W5 of the idler pulley 105 are known, the total torque of all the auxiliary machines can be known. Further, by detecting the rotation speed W0 and the rotation speed (W1 to 4) of one of the auxiliary machines 101 to 104, a desired auxiliary machine torque can be detected. Further, for example, by detecting the number of revolutions of the auxiliary machine 1 and the auxiliary machine 3,
It is possible to detect the total sum of auxiliary machine torques of auxiliary machines 2 and 3.

Incidentally, T1 to T5 in FIG. 2 represent the tension of the belt 300 between the respective auxiliary machines, and the idler pulley 1
Considering the accessory torque of 05 as 0, there is no change in tension before and after the idler pulley. Then, as a result of the inventors' study based on the above idea, it was confirmed that it is possible to accurately detect the accessory torque.

Therefore, according to the present invention, in the first aspect of the present invention, the first rotational speed detecting means for detecting the rotational speed of the drive shaft pulley and the second rotational speed detecting means for detecting the rotational speed of the idler pulley. Then, the total torque of the plurality of auxiliary machines is set based on the rotation speeds detected by the first and second rotation speed detecting means. Thereby, for example, in the case where there are three or more auxiliaries, the desired total torque of the two or more auxiliaries can be accurately set according to the installation position of the idler pulley. Further, since only the means for detecting the number of revolutions is simply provided, it is not necessary to provide each auxiliary machine with an auxiliary machine torque detecting device for detecting the auxiliary machine torque of one auxiliary machine, and the auxiliary machine torque can be detected inexpensively. can do.

According to the second aspect of the invention, the first rotation speed detecting means for detecting the rotation speed of the drive shaft pulley and the rotation speed of one of the plurality of auxiliary equipment pulleys are detected. The total torque of the plurality of auxiliary machines is set on the basis of the rotation speeds detected by the second rotation speed detection means and the first and second rotation speed detection means.

Also in this case, for example, in the case where there are three or more auxiliaries, the desired total torque of two or more auxiliaries can be accurately set depending on the installation position of the accessory pulley whose rotation speed is detected. can do. Further, since only the means for detecting the number of revolutions is simply provided, it is not necessary to provide each auxiliary machine with an auxiliary machine torque detection device for detecting the auxiliary machine torque of one auxiliary machine, and the auxiliary machine torque can be set at a low cost. Can be calculated.

Further, in the invention according to claim 6, the sum total torque detecting device has a map showing the relationship between the ratio of the number of revolutions or the difference in the number of revolutions and the sum total torque. The magnitude of the machine torque is substantially constant, and one auxiliary machine whose value is known is intermittently operated, and the total torque before and after the intermittent operation is set in advance, and the rotation speed ratio and the operation before the operation are set. It is characterized in that it has a correction means for correcting the map based on the subsequent rotation speed ratio.

As a result, due to the secular change of the belt,
Even if the elastic constant of the belt changes or the belt is operated under abnormal environmental conditions, it is possible to increase the detection accuracy of the total torque. Further, the invention according to claim 7 is characterized in that the idler pulleys for detecting the number of revolutions by the second number-of-revolutions detecting means are arranged side by side in front of each other in the traveling direction of the belt.

As a result, as is apparent from FIG. 3, in the belt transmission device in which a plurality of accessories are driven by one belt, the total torque of all the accessories can be accurately calculated. Further, the invention according to claim 8 is characterized in that the auxiliary machine pulleys for which the second rotation speed detecting means detects the rotation speed are arranged side by side in front of each other in the forward direction of the belt.

Also in this case, as is apparent from FIG. 3, in the belt transmission device in which a plurality of accessories are driven by one belt, the total torque of all the accessories can be accurately calculated. .

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) As shown in FIG. 6, in an internal combustion engine 1 mounted on an automobile or the like, a belt pulley for driving various auxiliary machines as a belt transmission device, for example, a pulley 2 for a compressor of an air conditioner, A plurality of accessory pulleys, such as a power steering hydraulic pump pulley 3, an alternator (power generation) pulley 4, and a radiator cooling fan pulley 5, are crankshaft pulleys 6 (generally speaking, drive shaft pulleys). Are driven simultaneously by a series of belts 7.

In such a belt transmission device, an idler pulley may be used for winding one belt 7 in a meandering manner on many pulleys.
In this example, an idler pulley 8 is provided, and an auto tensioner 9 that automatically adjusts the tension of the belt 7 to be constant is also provided on the loose side of the belt 7 together with one idler pulley 10.

As a feature of the present invention, in the embodiment shown in FIGS. 4 and 5, the autotensioner 9 is used to form a part of the accessory torque detecting device. Auto tensioner 9
On the inner ring surface 11 of the idler pulley 10, a large number of teeth 12 made of a magnetic material are provided at equal intervals. Actually, the entire idler pulley 10 is formed of a magnetic material such as iron or steel, and a large number of teeth 12 are cut and formed in the annular inner surface 11 in the shape of an internal gear. Alternatively, when the idler pulley 10 is molded by a method such as casting, the teeth 12 of the annular inner surface 11 may be simultaneously molded by the same mold.

The arm 13 of the autotensioner 9 is supported so that its base portion 14 can rotate within a limited range by a shaft (not shown). And
The arm 13 is urged in a rotational direction in which the belt 7 is tensioned by an urging means such as a spring or a hydraulic cylinder (not shown). A bearing 16 is provided on the shaft 15 integrally attached to the free end of the arm 13, and the idler pulley 10 is rotatably supported by the bearing 16.

An electromagnetic pickup 18 as a rotation speed sensor is attached to the protrusion 17 formed on the arm 13, and the tip (detection end) of the electromagnetic pickup 18 is
The teeth 12 are made to protrude from the teeth 12 at a predetermined distance from the teeth 12 made of a magnetic material. The electromagnetic pickup 18 is a well-known one, and is simply a permanent magnet, or a coil wound around a core of a magnetic material that magnetically connects it, and both ends of the coil are flexible. The external fixed terminals can be directly connected to the external fixed terminals by the lead wires 19 and 20 with a wire, or one end of the coil can be connected to the arm 13 and the other end of the coil can be pulled out to the outside by a flexible lead wire. Connect to.

Since the moving range of the arm 13 is limited within a narrow angle, the tip of such a flexible lead wire can be directly attached without using a sliding mechanism such as a slip ring. The output signal can be taken out by connecting to the target fixed terminal. And in this embodiment,
The total torque of the plurality of accessory torques driven by the series belt 7 is calculated, and the configuration of the total torque detection device 400 is shown in the block diagram of FIG.

That is, the total torque detecting device 400 in this embodiment is based on the rotation speed W1 of the crankshaft 21 (crankshaft pulley 6) and the rotation speed W2 of the idler pulley 10 measured by the electromagnetic pickup 18. By calculating the total torque and outputting the calculated total torque to the engine control device 500, the idle speed and the like of the engine 1 are controlled at appropriate times.

The crankshaft pulley 6 is provided with a rotation speed sensor 50 as shown in FIG. The rotation speed sensor 50 may be the crankshaft 21 or the crankshaft 21.
Even if it is not itself, it detects the rotation speed of a shaft driven with a constant rotation ratio with respect to the crankshaft 21, such as a cam shaft (not shown). Normally, in an internal combustion engine, the rotation speed W1 of the engine, or the rotation speed of the engine which rotates at a constant ratio, is often used as one factor for controlling the operation of the engine. Many vehicles are equipped with sensors.

Therefore, even if the rotation speed sensor is installed for another purpose, its output signal may be used for the purpose of the present invention. Further, in an internal combustion engine that does not include means for detecting the rotation speed W1, it is preferable to provide the crankshaft 21 pulley 6 with rotation speed detection means similar to those shown in FIGS.

Next, the operation of the first embodiment of the present invention shown in FIGS. 4 and 5 will be described. In FIG. 6, when the crankshaft 21 rotates, various pulleys 2, 3, 5, 8,
10 is rotationally driven all at once. At this time, in order to drive these various pulleys (various auxiliary machines), the crankshaft 2
The total torque acting on 1 does not only change according to the rotation speed of the crankshaft 21 itself, but also some auxiliary machines are operated intermittently like the compressor 2, so the total torque is not constant. It can be said that the internal combustion engine 1 is constantly changing during operation.

Therefore, if the fluctuating total torque can always be detected accurately in real time, the operating state of the internal combustion engine 1 (for example, idle speed) can be finely controlled. Therefore, in the present embodiment, based on the concept shown in FIGS. 1 to 3, the rotation speed W1 of the crankshaft 21 detected by the rotation speed sensor 50 and the crankshaft pulley 6 adjacent to the crankshaft pulley 6 in the forward direction of the belt 7. The total torque is detected with high accuracy by the rotational speed W2 of the pulley 10, which is an idler pulley, detected by the electromagnetic pickup 18 provided in the auto tensioner 9 arranged so as to match.

It should be noted that the electromagnetic pickup 18 rotates at a rotation speed W.
Although 2 is detected, this principle will be briefly described. When the idler pulley 10 of the auto tensioner is rotationally driven from the crankshaft pulley 6 via the belt 7,
A magnetic flux of a permanent magnet in which a large number of teeth 12 made of a magnetic material intermittently pass just before a detection end of an electromagnetic pickup 18 which is fixed with respect to the arm 13 and does not substantially move at minute time intervals. The density changes rapidly.

As a result, a pulse current having peaks at substantially equal intervals as a voltage waveform is generated in the coil of the electromagnetic pickup 18. This pulse current is taken out as an output signal corresponding to the rotation speed W2 directly to the external fixed terminal via the lead wires 19 and 20, and is input to the total torque detection device 400 equipped with a calculation device. In the total torque detection device 400, the rotation speed W2 of the idler pulley 10 of the auto tensioner is detected by counting the number of peaks of the pulse current, which is the output signal of the electromagnetic pickup 18, per unit time.

If the crankshaft pulley 6 and the idler pulley 10 have the same diameter, the rotational speed W2 is reduced by the amount of elastic slip between the crankshaft pulley 6 and the belt 7, so The magnitude of the slip amount of the idler pulley 10 with respect to the crankshaft pulley 6 can be known from the value of the ratio of the numbers W1 and W2 and the rotational speed ratio W1 / W2. In this case, the belt 7 and the idler pulley 10 are considered to have no load on the idler pulley 10.
The slip between and can be ignored.

Therefore, the crankshaft pulley 6 and the idler pulley 1 are controlled by the detected rotational speed W1 and rotational speed W2.
By calculating the rotation speed ratio W1 / W2 indicating the magnitude of the slip amount (slip ratio) between 0 and 0 and applying that value to FIG. 7, the total torque acting on the crankshaft 21 at that time is calculated. You can know the size. It has been confirmed by experiments by the present inventors that the method of calculating the total torque by such a method can detect with extremely high accuracy.

The slip amount (ratio) is conceived from the speed ratio between the slack side and the tension side of the belt 7, that is, the rotation speed ratio between the crankshaft pulley 6 and the idler pulley 10 as described above. Therefore, naturally, the radius ratio R between the crankshaft pulley 6 and the idler pulley 10 must be taken into consideration. That is, when W1, W2, S, and R are defined as follows, W1: rotational speed of the crankshaft 21 and the crankshaft pulley 6 W2: rotational speed of the idler pulley 10 of the auto tensioner S: belt 7 relative to the crankshaft pulley 6 That is, the slip ratio of the idler pulley 10 with respect to the crankshaft pulley 6 R: the radius ratio of the pulley (the diameter of the idler pulley 10 is R2,
When the diameter of the crankshaft pulley 6 is R1, R = R1 /
R2), the slip ratio S generated between the crankshaft pulley 6 and the belt 7 (idler pulley 10) is S = (W1−R · W2) / W2 = R · (W1 / W2) −1 ( 1) Since the radius ratio R in the mathematical expression (1) is a constant, the slip ratio S is the same as the case where the crankshaft pulley 6 and the idler pulley 10 have the same diameter.
It will depend on the value of / W2.

Therefore, in the slip ratio-auxiliary machine torque diagram for obtaining the value of the total torque from the slip ratio S, the vertical axis represents the rotation speed ratio W1 / W2 in FIG. The inclined straight lines showing the relationship are translated in the vertical direction. Further, as is clear from the mathematical expression (1), the value of W1−R · W2 = ΔW is based on the decrease in the number of revolutions generated in the idler pulley 10 due to the elastic slip between the crankshaft pulley 6 and the belt 7. Although the rotation speed is calculated as the rotation speed W2 of the idler pulley 10, the rotation speed W1 of the crankshaft pulley 6 having a small fluctuation in the rotation speed may be used as the reference rotation speed.

If the slip ratio in this case is S ', it can be defined as S' = (W1-R.W2) / W1 = 1-R. (W2 / W1) (2). Then, based on the rotation speed W1 of the crankshaft pulley 6, the rotation speed ratio W1 / W2
Is plotted on the vertical axis, and the auxiliary machine torque is plotted on the diagram on the horizontal axis as the horizontal axis.

FIG. 8 corresponds to FIG. 7 described above.
This is a case where the crankshaft pulley 6 and the idler pulley 10 have the same diameter. In this case, since the rotation speed W1 of the crankshaft pulley 6 is used as a reference, unlike the case of FIG. 7, the straight line of the rotation speed ratio-auxiliary equipment torque diagram is downward sloping. Further, like an internal combustion engine, a plurality of accessory pulleys 2 to 5
Is driven by a series of belts 7, it is not driven intermittently like the compressor pulley 2 of the air conditioner, but is constantly driven by a torque of a certain value or more like the cooling fan pulley 5. Since there are some of them, the value of the auxiliary machine torque acting on the crankshaft pulley 6 cannot be the origin in FIGS. Therefore,
The value of the rotation speed ratio W1 / W2 or W2 / W1 at that time never becomes 1.

Therefore, in FIGS. 7 and 8, in order to simplify the rotational speed ratio-auxiliary equipment torque diagram, the basic torque value of the auxiliary equipment to which the auxiliary equipment torque is constantly acting, and the corresponding basic torque value A minute change in the rotational speed ratio is omitted in the diagram.
In other words, the accessory torque on the horizontal axis is the sum of the accessory torque at which the torque value changes due to intermittent operation and the torque value at which the auxiliary machine is constantly driven, and the rotation at the vertical axis. The ratio of numbers starts at 1.000.

Further, as described above, the crankshaft pulley 6
Even when the radii between the idler pulley 10 and the idler pulley 10 are different from each other, for example, the slip ratio S ′ is defined by the above equation (2). By fitting the value to the slip ratio-auxiliary equipment torque diagram as shown in FIG. 9 prepared by actual measurement, the value of the auxiliary equipment torque acting at that time can be accurately read.

Even if the relationship between the slip ratio S based on the rotation speed W2 of the idler pulley 10 and the auxiliary machine torque is obtained, a slip ratio-auxiliary machine torque diagram similar to FIG. 9 can be obtained. Then, the slip ratio-auxiliary device torque diagram as shown in FIG. 9 obtained by actually measuring the relationship between the slip ratio and the auxiliary device torque in this way is previously mapped in the engine control device 400 including an arithmetic device, for example. If it is set as, the number of revolutions W1 and W2 is automatically and constantly detected by the detecting means as described above, and the magnitude of the auxiliary machine torque is automatically detected in real time from the detected value. You can

Further, in the above description, the accessory torque is set from the slip ratio, but it goes without saying that the accessory torque can be directly calculated from the rotation speed ratio. The processing procedure in this case is shown in FIG. (Second Embodiment) In the above-described first embodiment, the total torque of all the auxiliary machines is calculated, but the present invention detects the rotation speed of the crankshaft pulley 6 and which pulley rotation speed as described above. It is possible to know the desired auxiliary machine torque depending on whether the operation is performed.

That is, when the belt transmission device shown in FIG. 6 is applied to FIG. 2, the auxiliary machine 1 has the cooling fan pulley 2, the auxiliary machine 2 has the compressor pulley 2, the auxiliary machine 3 has the hydraulic pump pulley 3, and the auxiliary machine 3. The machine 4 corresponds to the alternator (power generation) pulley 4, and the auxiliary machine 5 corresponds to the idler pulley 10. The idler pulley 8 has no load torque and is ignored here.

Thus, for example, if the number of revolutions of the crankshaft pulley 6 and the number of revolutions of the compressor pulley 2 in FIG. 6 are detected, from the relationship of FIG.
And the total torque of the cooling fan pulley 5 can be calculated. Then, for example, the accessory torque of the cooling fan pulley 2 can be considered as a substantially constant value,
By subtracting the accessory torque of the fan pulley 2 from the above total torque, the independent accessory torque of the compressor pulley 2 can be calculated. The processing procedure in this case is shown in FIG.
Shown in

In addition, in this way, the compressor pulley 2
When calculating the auxiliary machine torque, it is necessary to provide a rotation speed sensor on the compressor pulley 2. However, depending on the vehicle model, the compressor pulley 2 may already have a rotation speed sensor. That is, there is a lock sensor (which determines the lock of the compressor based on the rotation speed of the compressor pulley 2) for detecting the lock of the compressor of the air conditioner. Therefore, if this is used, the rotation speed sensor is specially provided. Without, the auxiliary machine torque of the compressor can be calculated.

(Third Embodiment) In the first and second embodiments, the total torque of all the accessories is calculated in the belt transmission device in which a plurality of accessories are rotationally driven by the belt 7. In the present invention, the total torque of two or more desired auxiliary machines can be calculated by detecting the rotational speeds of the auxiliary machine and the idler pulley, respectively.

That is, when FIG. 6 is applied to FIG. 2 as described in the second embodiment, from the relationship shown in FIG. 3, the compressor pulley 2 and the cooling fan pulley 5 in FIG. If the rotation speed ratio is known, the correlation between this rotation speed ratio and the accessory torque of the independent compressor pulley 2 can be known. Therefore, if a map as shown in FIG. 7 is set based on this correlation, the auxiliary machine torque of the compressor can be calculated accurately.

Similarly, if the rotation speed ratio between the compressor pulley 2 and the power generation pulley 4 in FIG. 6 is known, this rotation speed ratio and the hydraulic pump pulley and the power generation pulley 4 are incorporated. The correlation with the total torque of the two auxiliary machines is known.
Therefore, if a map such as that shown in FIG. 7 is set based on this correlation, the total torque of the two auxiliaries including the hydraulic pump pulley and the power generation pulley 4 can be calculated accurately. .

Similarly, the idler pulley 8 in FIG.
If the rotation speed ratio with the power generation pulley 4 is known, the correlation between this rotation speed ratio and the total torque of the two auxiliary machines in which the hydraulic pump pulley and the power generation pulley 4 are incorporated can be known. Therefore, if a map as shown in FIG. 7 is set based on this correlation, the total torque of the two auxiliary machines including the hydraulic pump pulley and the power generation pulley 4 can be calculated accurately. You can also

As described above, if the rotational speed ratios of the two pulleys excluding the crankshaft pulley 6 are known, it becomes possible to calculate the auxiliary machine torque of the desired auxiliary machine. As a means for detecting the rotation speeds of the two pulleys, the rotation speeds of the pulleys may be detected by the electromagnetic pickup 18 as shown in FIGS. Further, when the rotation speed of the compressor pulley 2 is detected, if a compressor lock sensor is provided as described above, it may be used.

(Fourth Embodiment) In the first to third embodiments, the magnitude of the auxiliary machine torque acting on the crankshaft pulley 6 can be accurately detected in real time.
When the belt 7 is deteriorated due to a change in diameter or the effective radius of the pulley is changed, the slopes of the maps actually set as shown in FIGS. 7 to 9 under preset conditions become incompatible.

When the belt 7 is worn down and the pulley radius ratio R substantially changes due to long-term use, the rotation speed ratio--
The accessory torque diagram may become incompatible. Therefore, in the present embodiment, the maps shown in FIGS. 5 to 9 which are set in the total torque detection device 400 or the engine control device 500 for the arithmetic processing in order to cope with such a problem are set at predetermined timings. The correction means is provided so as to maintain the detection accuracy of the total torque always high by performing the correction.

An example of this correction means will be described with reference to FIG. For example, in many cars, a heat ray heater is provided on the glass surface of the rear window for defrosting. The hot wire heater applies an electric load of a certain magnitude to the alternator when it is energized by the alternator connected to the alternator pulley 4. Therefore, when the hot wire heater is energized, the torque for rotationally driving the alternator includes a certain increment.

Then, the value of the rotation speed ratio is detected between a state where the heat wire heater is energized (heat wire switch is ON) and a state where it is not energized (heat wire switch is OFF), and a preset total torque is obtained. , The relationship with the rotational speed ratio is plotted on the rotational speed ratio-auxiliary equipment torque diagram as shown in FIG.
These two points are linearly connected to replace the previously set straight line shown in FIG. 7 with this straight line.

Here, the preset total torque when the heat wire switches are turned on and off is, for example, when the belt 300 is initially used, at idle speed, when the compressor is off, that is, when the load torque is applied to the compressor pulley 2. Without, the load torque of the hydraulic pump pulley 3 is constant (for example, the vehicle handle is in the operating position where the vehicle is in the straight ahead state), and the total torque Tb and Ta are actually measured when the heat wire switch is turned on and off. It is a value. Also,
When the heat wire switch is turned on and off, the current value of the alternator changes, so the total torques Tb and Ta can be known from the current value of the alternator.

Specifically, the correction means shown in FIG. 12 first performs step 10 under the above-mentioned certain conditions.
1, when the heat ray switch is OFF, the respective rotation speeds W1a and W2a of the crankshaft pulley 6 and the idler pulley 10
Is detected and the rotation speed ratio Wra = W2a / W1a is calculated. Then, the coordinates (Ta, Wra) of point A, which is a reference value on the rotational speed ratio-auxiliary machine torque diagram as shown in FIG. 7, are determined.

Next, within a short time after finishing the processing of step 101, the routine proceeds to step 102, where the heat wire switch is ON and the crankshaft pulley 6 and the idler pulley 1 are
The respective rotational speeds W1b and W2b of 0 are detected, and the rotational speed ratio Wrb = W2b / W1b is calculated. Then, the coordinate of the point B (Tb, which is a reference value on the rotational speed ratio-auxiliary device torque diagram as shown in FIG.
Determine Wrb).

In this way, the rotational speed ratio-points A and B on the auxiliary machine torque diagram are determined.
The new diagram created by linearly connecting the points and the points B is replaced with the map previously set in the total torque detection device 400 or the engine control device 500. Further, this processing may be performed in the same procedure when setting the initial map (FIGS. 7 to 9).

After the processing of step 101, the time for performing the processing of step S102 is two or three.
It is necessary to keep it in seconds so that other fluctuations of auxiliary machine torque do not occur during that time. (Fifth Embodiment) In the present embodiment, unlike the above-described calculation of the total torque based on the rotation speed, the total torque of each auxiliary machine such as an alternator and a power steering pump is changed from the state change of the auto tensioner pulley 11 as described later. Is detected and the detection result is sent to the engine control device 500. The engine control device 500 appropriately changes the engine output according to the fluctuation of the total torque to maintain the engine speed constant.

FIG. 13 is a cutaway perspective view of the auto tensioner 9, and FIG. 14 is a sectional view of the auto tensioner 9. Idler pulley 10 (hereinafter simply referred to as pulley)
Has a flat outer peripheral surface in contact with the back surface of the V-belt 7 and is rotatably supported by a shaft 15 provided at the tip of the arm 13. A thick-walled tubular boss portion 111 is formed at the center of the main body of the pulley 10, and the boss portion 111 is rotatably coupled to the shaft 15 via a ball bearing 16 (bearing).

The base end of the arm 13 is rotatably supported by a support shaft 115 erected on the side surface of the engine.
The tip of the arm 13 is urged in the direction of the arrow in FIG. 13 by the spring force of the coil spring 113 arranged around the support shaft 115, so that a substantially constant tension is constantly applied to the belt 7 suspended by the pulley 10. In FIG. 14, the base end of the arm 13 is a support shaft 115 erected on the side surface of the engine E.
The umbrella-shaped holding portion 141 is rotatably attached to the holding portion 141. The holding portion 141 is a coil spring 113 arranged around the holding portion 141.
Is urged to rotate around the support shaft 115. Pulley 1
0 is supported by a shaft 15 provided at the tip of the arm 13 via ball bearings 16. Strain gauges 73 are attached to the shaft 15 at a plurality of locations on the outer circumference of the base.

Although the tension of the belt 7 is kept substantially constant by the pulley 10 of the auto tensioner 9, microscopically, when the load torque of any of the other accessories changes, the tension of the belt 7 also becomes small. Changes to. This change in tension is shown in Figure 1.
As shown in FIG. 5, since it appears as the axial load of the shaft 15, if this is detected by the strain gauge 73, the total torque of all the auxiliary machines can be calculated in a proportional relationship as shown in FIG. Therefore, by changing the engine output according to the total torque, it is possible to prevent a sudden change in the engine speed. (Sixth Embodiment) FIG. 17 shows a front view of the automatic tensioner 9, and FIG. 18 shows a sectional view thereof. The holding portion 141 at the base end of the arm 13 is a base body 1 fixed to the side surface of the engine.
16 is rotatably coupled to a support shaft 115, and a shaft 15 is formed at the tip of the arm 13 to support the pulley 1
0 is rotatably supported. The arm 13 is the spindle 11.
The coil spring 113 around 5 urges it to rotate counterclockwise in FIG. 17, and in this state, the V-belt 4 extending from the left side of the drawing is suspended.

At the tip of the arm 13, a light emitting diode 74 is provided on the base body 11 on the surface opposite to the side where the pulley 10 is located.
6 is provided, while the light emitting diode 74 is provided.
A position detection sensor 75 that extends linearly in the left-right direction in FIG. 17 is provided on the support wall 161 at the lower edge of the base body 116 that faces the. As shown in FIG. 19, the position detection sensor 75 has slits 751 on the front surface at regular intervals, and a photodiode array 752 is arranged at a position corresponding to these slits 751.

When the total torque of the auxiliary machines increases and the tension of the belt 7 increases, the arm 13 rotates counterclockwise in FIG. 17 against the spring force of the coil spring 113, and the rotation angle changes. The tip of the arm 13 and the pulley 10 provided here move to the right in FIG. This movement is detected by the photodiode array 752 which receives the light of the light emitting diode 74, and in a proportional relationship as shown in FIG. The total sum of the load torques, that is, the total sum torque is calculated.

(Other Examples) In the above-mentioned first to fourth embodiments,
Although the electromagnetic pickup 18 is used as the rotation speed sensor, an optical element as shown in FIGS. 21 and 22 may be used.
In FIG. 21, 22 is a light emitting element such as a light emitting diode, 2
Reference numeral 3 is a light receiving element such as a photodiode. The light emitting element 22 and the light receiving element 23 are mounted on the arm 13 so as to face each other at the edge portion of the idler pulley 10 of the auto tensioner 9 as in the first and second embodiments. For this purpose, the arm 13 is provided with a protrusion 24 for supporting either the light emitting element 22 or the light receiving element 23.
It may be formed integrally with.

Between the light emitting element 22 and the light receiving element 23, the light emitting element 22 and the light receiving element 23 are arranged so that a rotary slit 25 formed in an annular shape at the edge of the idler pulley 10 is interposed.
Is positioned. As shown in FIG. 21, the rotary slits 25 are formed by forming small radial openings 27 through which light is transmitted through an annular plate 26 at equal intervals when viewed from the circumferential direction. It may be formed directly on the portion 28. Alternatively, the rotary slit 25 may be formed separately from the idler pulley 10 and attached to the skirt portion 28. In addition, the light receiving element 23
A plate-shaped fixed slit 29 as a mask is formed on the light receiving surface of
Are fixed, and some openings 30 are formed in the fixed slit 29.

As a result, when the idler pulley 10 is rotated by being driven by the belt 7, the rotary slit 25 is also rotated, and the optical axis of the light emitting element 22 is rotated by the rotary slit 25.
Only when the opening 27 formed in the annular plate 26 and the opening 30 formed in the fixed slit 29 coincide with each other, the light emitted from the light emitting element 22 reaches the light receiving element 23 and the pulse current is emitted from the light receiving element 23. Is output.

Therefore, this pulse current represents the rotation speed W2 of the idler pulley 10 as in the first and second embodiments, and the rotation speed W of the crankshaft 21 separately measured.
When processed together with 1, the magnitude of the total torque acting on the crankshaft 21 can be known from the rotational speed ratio-auxiliary machine torque diagram as shown in FIG. Further, in each of the embodiments described above, a plurality of auxiliary components such as the compressor pulley 2, the power steering hydraulic pump pulley 3, the alternator pulley 4, and the radiator cooling fan pulley 5 are provided by one belt 7. Although the machine is driven, the present invention can be applied to a belt transmission device as shown in FIG.

That is, the belt transmission device shown in FIG.
It is composed of a crankshaft pulley 6, a compressor pulley 2, and a power steering hydraulic pump pulley 3, and is not provided with an auto tensioner, an idler pulley, or the like. Then, in such a belt transmission device, if the rotation speed of the crankshaft pulley 6 and the rotation speed of the hydraulic pump pulley 3 are detected, the rotation speed can be determined in the same manner as in the first and second embodiments.
The total torque of one accessory can be calculated. Also,
By detecting the rotation speed of the crankshaft pulley 6 and the rotation speed of the compressor pulley 2, it is possible to calculate the auxiliary machine torque of the compressor (not shown) alone of the air conditioner.

In FIG. 23, the arrangement positions of the compressor pulley 2 and the power steering hydraulic pump pulley 3 may be interchanged, or any auxiliary equipment may be used. Further, in the first to third embodiments described above, a large number of teeth 12 are cut and formed in the annular inner surface 11 of the idler pulley 10 in the shape of an internal gear, but one may be formed as shown in FIGS. In this case, the tooth 12 can be easily processed.
Further, as shown in FIGS. 26 and 27, the slits 116 may be formed along the circumferential direction of the idler pulley 10 by casting or the like in the disk-shaped disc portion of the idler pulley 10 to serve as the teeth 12. .

Further, as shown in FIG. 28, slits 116 may be formed in the peripheral wall portion of the idler pulley 10 to serve as the teeth 12. In this case, the electromagnetic pickup 18 is arranged so as to face the slit.
In addition, in the first embodiment, the idler pulley 10
The total torque of the auxiliary machinery was calculated by detecting the rotational speeds of the crankshaft pulley 6 and the crankshaft pulley 6, and the rotational speeds of the crankshaft pulley 6 and the power generation pulley 4 were detected in FIG. Based on this, the total torque of the auxiliary machines may be calculated by setting the rotational speed ratio-auxiliary machine torque diagram as shown in FIG. In this case, the power generation pulley 4
As the detection means, the electromagnetic pickup 18 and the tooth 12 as shown in FIGS. 4 and 5 may be used, or the light emitting element 22 and the light receiving element 23 may be used for detection.

Further, in the above-mentioned first to fourth embodiments, the total torque is calculated based on the rotation speed ratio, but the total torque may of course be calculated based on the difference in the rotation speed.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing the principle of the present invention.

FIG. 3 is a diagram showing an outline of the present invention.

FIG. 4 is a sectional view of the idler pulley 10 according to the first embodiment of the present invention.

FIG. 5 is an idler pulley 10 according to the first embodiment.
FIG.

FIG. 6 is an overall configuration diagram of a belt transmission device in the first embodiment.

FIG. 7 is a relationship diagram between a rotation speed ratio and an accessory torque in the first embodiment.

FIG. 8 is a relationship diagram between a rotation speed ratio and auxiliary machine torque in the first embodiment.

FIG. 9 is a relationship diagram between the slip ratio and the accessory torque in the first embodiment.

FIG. 10 is a flowchart showing a procedure of calculating an auxiliary machine torque in the first embodiment.

FIG. 11 is a flowchart showing a procedure for calculating an auxiliary machine torque according to the second embodiment of the present invention.

FIG. 12 is a flowchart showing a procedure of processing according to the fourth embodiment of the present invention.

FIG. 13 is a cutaway perspective view of an auto tensioner according to a fifth embodiment of the present invention.

FIG. 14 is a vertical sectional view of an auto tensioner according to a fifth embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a relationship between a belt tension and an axial load of an auto tensioner pulley in the fifth embodiment.

FIG. 16 is a diagram showing a relationship between a belt tension change and a load torque of an auxiliary machine in the fifth embodiment.

FIG. 17 is a front view of an auto tensioner according to a sixth embodiment of the present invention.

18 is a vertical cross-sectional view of the auto tensioner according to the sixth embodiment, which is a cross-sectional view taken along line XX of FIG.

FIG. 19 is a cutaway perspective view of a position detection sensor according to the sixth embodiment.

FIG. 20 is a diagram showing a relationship between a change in rotation angle of an arm and a load torque of an auxiliary machine in the sixth embodiment.

FIG. 21 is a diagram showing another example of the present invention.

FIG. 22 is a diagram showing another example of the present invention.

FIG. 23 is a diagram showing another example of the present invention.

FIG. 24 is a diagram showing another example of the present invention.

FIG. 25 is a diagram showing another example of the present invention.

FIG. 26 is a diagram showing another example of the present invention.

FIG. 27 is a diagram showing another example of the present invention.

FIG. 28 is a diagram showing another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Compressor pulley, 3 ... Hydraulic pump pulley 4 ... Power generation pulley, 5 ... Cooling fan pulley, 6 ... Crankshaft pulley 7 ... Belt, 10 ... Idler pulley, 12 ... Tooth, 18 ...
Electromagnetic pickup 50 ... Rotation speed sensor

Front page continued (72) Inventor Mitsuo Matsuda 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Auto Parts Research Institute, Inc. (72) Inventor Kusunaga Matsuoka 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Pref. (72) Inventor, Koji Yamanaka, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yoshiaki Takano, 1-1, Showa-cho, Kariya city, Aichi prefecture In-house (72) Inventor, Kusuke Sakakibara, 1-1, Showa-cho, Kariya, Aichi Prefecture, Nippon Denso Co., Ltd. (72) Inventor, Hiroshi Kinoshita, 1-1, Showa-cho, Kariya, Aichi Prefecture, Nihon-denso Co., Ltd.

Claims (11)

[Claims] 1. A drive shaft pulley (6) provided on an engine (1) and rotationally driven by the engine (1), at least one idler pulley, the drive shaft pulley (6) and the idler pulley (8). And a plurality of accessory pulleys (2 to 5) for driving a plurality of accessories by a single belt (7) wound around the auxiliary torque detector. First rotational speed detecting means (50) for detecting the rotational speed of the shaft pulley (6), and second rotational speed detecting means (12, 18) for detecting the rotational speed of the idler pulleys (8, 10). , The first and second rotational speed detecting means (12, 18, 50)
Based on the rotation speed (W1, W2) detected by
An auxiliary machine torque detection device for a belt transmission device, which detects a total torque of the plurality of auxiliary machines. 2. A plurality of drive shaft pulleys (6) provided on the engine (1) and rotationally driven by the engine (1) and a plurality of belts (7) wound around the drive shaft pulley (6). An auxiliary machine torque detection device for a belt transmission device having a plurality of auxiliary machine pulleys (2-5) for driving an auxiliary machine, the first rotational speed detection detecting the rotational speed of the drive shaft pulley (6). Means (50) and second rotation speed detection means (12, 18) for detecting the rotation speed of one of the plurality of accessory pulleys.
And the total torque of the plurality of accessories based on the rotation speeds (W1, W2) detected by the first and second rotation speed detection means. Torque detection device. 3. The first and second rotation speed detecting means (1)
2,18,50) detected rotation speed (W1, W
2) based on the slip ratio (S, S,
3. The accessory torque detecting device for a belt transmission device according to claim 1, wherein a sum of accessory torques of the plurality of accessories is detected according to S '). 4. The first and second rotational speed detecting means (1
2. The belt according to claim 1, wherein the total torque of the plurality of auxiliary machines is detected based on the difference or the ratio of the rotational speeds detected by 2, 18, 50). (7) Auxiliary device torque detection device of the transmission device. 5. An auxiliary machine for a belt (7) transmission device according to claim 2, wherein the idler pulley (10) is provided in an auto tensioner for keeping the tension of the belt (7) constant. Torque detection device. 6. The sum total torque detection device has a map showing a relationship between the ratio of the rotational speeds or a difference in the rotational speeds and the total torque, and the magnitude of the auxiliary machine torque among the plurality of auxiliary machines. Is substantially constant, and one of the accessories whose value is known is operated intermittently, the total torque before and after the intermittent operation is preset, and the rotation speed ratio before operation and the rotation after operation are set. The accessory torque detection device for a belt transmission device according to claim 4, further comprising a correction unit that corrects the map based on a number ratio. 7. The number of revolutions (W
7. The idler pulleys (10) for detecting 1) are arranged so as to be adjacent to each other in front of the belt (7) in the rotational direction, and the idler pulleys (10) are arranged. An accessory torque detecting device for the belt transmission device described. 8. The number of revolutions (W
7. The accessory pulleys (4) for detecting 1) are arranged so as to be adjacent to each other in front of the belt (7) in the traveling direction. Belt transmission device accessory torque detection device. 9. A drive shaft pulley (6) provided on an engine (1) and rotationally driven by the engine (1), at least one idler pulley, the drive shaft pulley (6) and the idler pulley (8). 10) Driving a plurality of accessories by one belt (7) wound around 3)
An auxiliary machine torque detection device for a belt transmission device having one or more auxiliary machine pulleys (2-5), wherein the first auxiliary machine detects the rotation speed of one of the plurality of auxiliary machine pulleys. A rotation speed detection means (50) and a second rotation speed detection means for detecting the rotation speed of the idler pulley (10) or another accessory pulley different from the first rotation speed detection means of the plurality of accessory pulleys. Detecting the total torque of the plurality of auxiliary machines based on the rotation speed detection means (12, 18) and the rotation speeds (W1, W2) detected by the first and second rotation speed detection means. An auxiliary machine torque detection device for a belt transmission device. 10. A drive shaft pulley (6) provided on an engine (1) and rotationally driven by the engine (1),
At least one idler pulley (10), the drive shaft pulley (6) and the idler pulley (8, 10)
An auxiliary machine torque detection device for a belt transmission device having a plurality of auxiliary machine pulleys for driving a plurality of auxiliary machines by one belt (7) wound around the auxiliary machine, wherein the auxiliary machine torque detection device is the idler. An auxiliary machine torque detecting means for a belt transmission device, wherein a total torque of the plurality of auxiliary machines is set based on a change in an axial load of a support shaft of the pulley (10). 11. A drive shaft pulley (6) provided on an engine (1) and rotationally driven by the engine (1),
A plurality of accessory pulleys (2) for driving a plurality of accessories by at least one idler pulley (10) and one belt (7) wound around the drive shaft pulley (6) and the idler pulley (10). To 5), the accessory torque detecting device for a belt transmission device, wherein the idler pulley (10) is a pulley of an auto tensioner provided at a tip of an arm (14) that is rotationally biased by a spring member (113). (10), wherein the accessory torque detecting device detects the total torque of the plurality of accessories based on the position change of the idler pulley (10) of the auto tensioner. Machine torque detection device.