EP2086810B1 - Method for simulating the braking of a cable transport system, method for diagnosing the braking of said system and control device for said system - Google Patents

Description

The invention relates to a method for simulating the braking of a cable transport installation. The invention also relates to a braking means diagnosis method and a control device of a cable transport installation for implementing said simulation method.

In the document WO 2004/035448 describes a method of monitoring an elevator comprising at least one braking means of the motor means. According to this document, the braking of an elevator is checked by establishing baseline driving currents at several determined positions as the bucket moves up and down empty and at full load. During normal back and forth, the load is recorded and the motor current required to drive the load at a constant speed to the next determined position is predicted and measured. If the difference between the predicted and actual current exceeds a predetermined tolerance, the cage stops at the next stage, the system is stopped and a message is generated. When the brake is in proper operating condition, a baseline motor current required to move an elevator shaft with the brake engaged is recorded. Then, a high fraction (such as 90%) of baseline motor current is applied in an attempt to move the bucket. If the bucket moves, the system is stopped and a message generated.

In the document EP 1,561,718 is described a method of monitoring the braking of an elevator, according to which the frequency regulation of an elevator control is used to measure the current of the drive motor of the elevator. This measured value is compared to a reference value and the elevator is automatically switched off when the measured value falls below the reference value.

In the document WO 03/033388 describes a method for diagnosing elevator installations using at least one acceleration sensor, which consists of continuously measuring the acceleration of a cabin of the moving elevator installation, to be transmitted immediately the acceleration data measured at an analysis unit, to determine normalized parameters from these acceleration data, then to compare the normalized parameters with theoretical parameters recorded for the elevator installation, in order to detect a change of state, the theoretical parameters having been measured and detected when the elevator installation was in a correct state.

For safety reasons, the braking means of a cable transport installation must be tested periodically. In order to carry out these tests in conditions as close as possible to the conditions of use, the braking must be tested when the installation is loaded.

In the prior art, it is known to equip the ballast transport installation before carrying out the control operations of the braking means. In this way, the weights make it possible to simulate the normal operation of a driven driven installation. However, the installation of ballast is a simulation operation requiring many handling operations that increases the time and costs of testing the braking means.

The invention aims to remedy these problems by proposing a braking simulation process of a transport facility that is simple, inexpensive, quick to implement and accurate.

For this purpose, and according to a first aspect, the invention proposes a method for simulating the braking of a cable transport installation comprising at least one braking means and motor means, the simulation method comprising at least one step of application of the braking means to the installation driven by the closed-loop controlled motor means by a setpoint signal formed by a predetermined control curve F = f (t).

Thus, the motor means that continue to operate during the application of the braking means can in particular simulate the effort of a load on the installation. This simulation makes it possible in particular to diagnose the braking means without having to ballast said installation.
In a first embodiment, for closed-loop control, the reference signal is compared with a measurement of the force exerted on the cable, the engine torque or a characteristic variable of the drive means and proportional to the force exerted on the cable, the engine torque or the instantaneous power delivered by the motor means.

In a second embodiment, for the closed-loop control, the reference signal is compared to a measurement of the speed of the cable.

According to a second aspect of the invention, there is provided a method for diagnosing at least one braking means of a cable transport installation comprising motor means, the diagnostic method comprising at least one test phase of the braking means. comprising at least one simulation phase by the simulation method according to the first aspect of the invention operated on a vacuum driven plant and recording a test characteristic curve.

Advantageously, the test phase further comprises a second step of comparing the test characteristic curve with a pre-recorded standard characteristic curve.

Thus, the diagnosis of the braking means is carried out simply by comparing the test characteristic curve with a theoretical curve or measured during a preliminary phase.

• une étape d'enregistrement de la courbe caractéristique étalon lors d'une application du moyen de freinage sur l'installation fonctionnant en charge ; et
• une étape de d'enregistrement de la courbe de pilotage des moyens moteurs F = f(t) lors d'une application du moyen de freinage sur l'installation entraînée à vide par les moyens moteurs commandés en boucle fermée par un signal de consigne formé par ladite courbe caractéristique étalon.

In a variant of the invention, the method further comprises a preliminary calibration phase comprising at least:

• a step of recording the standard characteristic curve during an application of the braking means on the installation operating under load; and
• a step of recording the driving curve of the drive means F = f (t) during an application of the braking means to the vacuum driven plant by the drive means controlled in a closed loop by a set command signal formed by said standard characteristic curve.

This preliminary phase makes it possible to take into account the real characteristics of the installation, for example when it is put into service, and avoids having to establish theoretical curves.

• une étape d'enregistrement de la courbe de pilotage des moyens moteurs F = f(t) lors d'une application du moyen de freinage sur l'installation fonctionnant en charge ; et
• une étape d'enregistrement de la courbe caractéristique étalon lors d'une application du moyen de freinage sur l'installation entraînée à vide par les moyens moteurs commandés en boucle fermée par un signal de consigne formé par ladite courbe de pilotage.

In another variant of the invention, the diagnostic method further comprises a preliminary calibration phase comprising at least:

• a step of recording the driving curve of the motor means F = f (t) during an application of the braking means on the load-fed installation; and
• a step of recording the standard characteristic curve during an application of the braking means on the vacuum driven plant by the drive means controlled in a closed loop by a reference signal formed by said control curve.

Advantageously, the preliminary phase comprises a first step of adjusting the braking means. Thus, the method according to the invention allows an accurate diagnosis.

• une étape d'application du moyen de freinage sur l'installation fonctionnant à vide entraînée par les moyens moteurs commandés en boucle fermée par un signal de consigne formé par la courbe de pilotage F= f(t) et d'enregistrement d'une courbe caractéristique de vérification; et
• une étape de comparaison de la courbe caractéristique de vérification et de la courbe caractéristique étalon.

Advantageously, the preliminary phase comprises a calibration verification operation comprising:

• a step of applying the braking means to the vacuum operated installation driven by the closed-loop controlled motor means by a setpoint signal formed by the control curve F = f (t) and recording a verification characteristic curve; and
• a step of comparing the verification characteristic curve and the standard characteristic curve.

Thus, this operation makes it possible to validate the consistency of the calibration phase.

Advantageously, the control curve F = f (t) is extended by a constant function K = f (t) in order to prolong the simulation over a longer duration than the deceleration time of the calibration step.

• une étape d'application du moyen de freinage sur l'installation fonctionnant à vide et d'enregistrement d'une courbe caractéristique à vide, et
• une étape de comparaison de la courbe caractéristique à vide avec une courbe caractéristique étalon à vide préenregistrée.

Advantageously, the test phase further comprises:

• a step of applying the braking means to the installation operating at no load and recording a characteristic curve when empty, and
• a step of comparing the empty characteristic curve with a prerecorded standard characteristic curve.

The standard vacuum characteristic curve is a curve recorded during an application of the braking means on the installation operating at no load.

Thus, the method according to the invention also makes it possible to test the braking means on an installation operating in a vacuum.

In a first embodiment, the characteristic curves are curves of deceleration of the cable and the recording of the control curve F = f (t) is carried out by a measurement of the force exerted on the cable, the motor torque or a variable characteristic of the motor means and proportional to the force exerted on the cable, the engine torque or the instantaneous power delivered by the motor means.

In a second embodiment, the characteristic curves are curves for measuring the force exerted on the cable, the motor torque or a variable characteristic of the motor means and proportional to the force exerted on the cable, to the engine torque or to the instantaneous power delivered by the motor means and the control curve F = f (t) is achieved by a measurement of the deceleration of the cable .

Advantageously, the method uses an indexing of the position of at least one vehicle driven by the cable. Thus, the accuracy of the diagnosis is ensured because the different recordings can be made for similar load distributions on the cable.

Advantageously, for a cable transport installation whose braking means is a pneumatic or hydraulic means, the test phase comprises a step of recording a curve of the pressure variations Pt = f (t) during the application. braking means and a step of comparing Pt = f (t) with a predetermined curve Pe = f (t).

The curve Pe = f (t) is a curve of the pressure variations recorded during the preliminary phase during the application of the braking means.

Thus, these curves make it possible to determine whether the differences in operation observed are related to the hydraulic or pneumatic controls.

Finally, according to a third aspect, the invention relates to a device for controlling a cable transport installation, comprising motor means and at least one braking means, the device comprising means for controlling the motor means, means for control of the braking means and a safety device. The control device comprises means for switching the safety device between an active position in which the simultaneous use of the motor means and the braking means is prohibited, and a passive position in which said simultaneous use is authorized.

Advantageously, the device further comprises cable speed measuring means, data recording means, pressure measuring means, means for measuring the intensity of the current flowing through the motor means and means for measuring the speed of the cable. indexing the position of at least one vehicle.

• la figure 1 représente une courbe caractéristique selon un premier mode de réalisation de l'invention enregistrée lors d'une application du moyen de freinage sur l'installation fonctionnant en charge, ladite courbe de caractéristique étant une courbe de décélération du câble Vec= f(t);
• la figure 2 représente la courbe de décélération étalon Vec = f(t) de la figure 1 et une courbe de pilotage des moyens moteurs F = f(t) enregistrée lors d'une application du moyen de freinage sur une installation entraînée à vide par des moyens moteurs commandé en boucle fermée par un signal de consigne formé par la courbe de décélération Vec = f(t) ;
• la figure 3 représente la courbe de décélération étalon Vec= f(t), la courbe de pilotage des moyens moteurs F= f(t) et une courbe de décélération du câble Vv = f(t) enregistrée lors de d'une opération de vérification de l'étalonnage ; et
• la figure 4 représente les courbes des figures 1 et 2 et trois courbes tests de décélération Vtc = f(t) lorsque le freinage est trop important, réglé ou trop faible.

Other objects and advantages of the invention will become apparent from the following description, made with reference to the appended drawings, in which:

• the figure 1 represents a characteristic curve according to a first embodiment of the invention recorded during an application of the braking means to the load-fed installation, said characteristic curve being a deceleration curve of the cable Vec = f (t);
• the figure 2 represents the standard deceleration curve Vec = f (t) of the figure 1 and a control curve of the motor means F = f (t) recorded during an application of the braking means on a vacuum-driven installation by motor means controlled in a closed loop by a reference signal formed by the deceleration curve Vec = f (t);
• the figure 3 represents the standard deceleration curve Vec = f (t), the control curve of the motor means F = f (t) and a deceleration curve of cable Vv = f (t) recorded during a calibration check operation; and
• the figure 4 represents the curves of Figures 1 and 2 and three deceleration test curves Vtc = f (t) when the braking is too important, set or too weak.

By closed loop is meant in the sense of the detailed description below a control loop performing a comparison between a setpoint and an output variable in order to make the output value turn towards the setpoint value.

In addition, in the following description, when mentioning a characteristic variable motor means and proportional to the force exerted on the cable, the engine torque, it may for example be, depending on the type of power supply chosen for motor means, electrical control variables such as the modulation frequency of a converter supplying the motor means, a variable intensity or variable power supply of the motor means. It may also be mechanical variables directly measured on the installation, such as the tension force of the drive cable or the torque of the drive means.

A cable transport installation is generally composed of at least two stations between which at least one mobile transport cable forms a loop in order to transport one or more vehicles, for example one or more cable car cabins, from a station to a station. other. Where appropriate, the vehicle or vehicles may be suspended from the moving cable which ensures their training. Alternatively, as is customary for large capacity installations, the vehicles can be suspended from fixed cables via a roller balancer, and driven along the fixed cables by the movable transport cable.

Motor means for driving the cable. The motor means are for example composed of one or more electric motors, a driving pulley and a disengageable device for transmitting movement between the motor (s) and the driving pulley.

In addition, the installation is equipped with braking means. The braking means may include an electromagnetic brake consisting of cutting off the power of the engines, one or more service brakes applying during normal stops of the installation and one or more emergency brakes.

In one embodiment of the invention, the service brake acts on the drive shaft of the drive means while the emergency brake acts directly on the drive pulley.

In an alternative embodiment, the braking means are hydraulic or pneumatic brakes. The braking means are, for example braking means whose opening is actuated by hydraulic or pneumatic means such as cylinders, mechanical return means such as springs, for recalling the braking means to their closed position of braking.

The installation further comprises a control device of the transport facility. The device comprises at least control means of the motor means and control means of the means (s) for braking. Advantageously, the control device comprises a safety device that allows in the active position to stop the power of the motor means as soon as a braking means is actuated. The method according to the invention comprises steps during which the motor means must operate simultaneously with the braking means. Consequently, the control device of the installation comprises a device for switching the safety device between its active position and a passive position in which the simultaneous control of the motor means and a braking means is authorized.

The controller also includes a diagnostic device. The diagnostic device comprises data recording means, is connected to the motor means and to the braking means and receives information from means for measuring the speed of the cable, means for measuring a characteristic variable of the motor means, means for indexing the position of the vehicles and means for measuring the pressure in the braking means.

In one embodiment, the characteristic variable of the motor means is the intensity passing through the motor means.

In a variant, the control and diagnostic device consists of a console and a control unit. However, it should be noted that the invention is not limited to this embodiment and that all appropriate control devices, computer or electronic, may be used.

According to an advantageous embodiment of the invention, the method of diagnosis of a braking means comprises a preliminary calibration phase which can in particular be performed during the commissioning of the installation.

During the calibration phase, the braking means of the installation are previously adjusted to the statutory values.

The calibration phase then comprises a first step in which a braking means is applied to the installation operating under load and a standard characteristic curve is recorded. In the embodiment shown, the standard characteristic curve is a curve 1 of deceleration of the cable Vec = f (t) ( figure 1 ).

During this step, it will be noted that the motor means are stopped during the application of the braking means.

If the braking means is a pneumatic or hydraulic means, it is also possible to record during this step a curve of variation of the pressure Pe = f (t) in the braking means during its application on the installation.

In a second step, the braking means are applied to the vacuum-driven plant by motor means controlled in a closed loop by a reference signal formed by the standard characteristic curve: the deceleration curve Vec = f (t ) in the embodiment shown. The closed-loop control device performs a comparison between the actual deceleration of the cable and the set deceleration Vec = f (t) and controls the motor means in order to obtain an actual deceleration corresponding to the setpoint. During this step, the control curve 2 of the motor means F = f (t) (FIG. figure 2 ).

In the first embodiment shown on the figure 2 , the control curve 2 corresponds to the evolution of the intensity of the electric current passing through the motor means. It will be noted, however, that this curve can also be achieved by measuring any variable related to the force exerted by the drive means on the cable or the engine torque, or the instantaneous power delivered by the motor means.

It will be noted that the calibration phase therefore makes it possible to produce a driving curve 2 F = f (t) of the motor means making it possible to simulate the load force during the application of the braking means to a vacuum installation. .

In addition, it will be noted that the control curve F = f (t) is extended by a constant function 7 K = f (t) making it possible to simulate the load for a period of time. longer than the deceleration time of the cable during the second calibration step.

In addition, during this second step, one can also record the pressure variation curve Pe1 = f (t) and verify that it corresponds to the curve Pe = f (t) recorded previously.

Preferably, it is also planned to check the calibration by recording a verification characteristic curve when the braking means is applied to the vacuum-driven plant by the closed-loop controlled motor means by a reference signal formed by the control curve 2 F = f (t) as a reference signal. For the embodiment shown, the verification characteristic curve corresponds to the deceleration curve 6 of the cable Vv = f (t). During this verification, a characteristic verification curve ( figure 3 ) and possibly a pressure curve Pe2 = f (t) are measured. If the verification characteristic curve coincides with the standard characteristic curve, the calibration can then be validated. In one embodiment of the invention, the concordance of the pressure curves Pe = f (t) and Pe2 = f (t) is also verified.

The diagnostic method comprises at least one step of testing the braking means. This test step may in particular be carried out periodically to verify that the adjustment of the brake is in accordance with the regulatory adjustment values.

During this test step, a vacuum-driven operation is performed on a vacuum-driven installation performed on a load-driven installation. For this purpose, the braking means are applied to a vacuum-driven installation by the motor means controlled in a closed loop by a reference signal formed by the previously recorded control curve F = f (t). Thus, during this step the motor means simulate the effort of the load and a test characteristic curve is recorded.

In the embodiment shown on the figure 4 three test characteristic curves formed by curves 3, 4, 5 of cable deceleration Vtc = f (t) are shown.

In order to determine whether the adjustment of the brakes is correct, the test characteristic curve 3, 4, 5 Vtc = f (t) is compared with the standard characteristic curve: Vec = f (t).

On the figure 4 , the first curve 3 has a steeper slope than the standard curve Vec = f (t) and represents a case in which the braking is too great. The second curve 4 has a slope of the same order as the standard curve Vec = f (t) and represents a case in which the braking is set. Finally, the third curve 5 has a lower slope than the standard curve Vec = f (t) and represents a case in which the braking is too weak. According to the comparison of the curves Vec = f (t) and Vtc = f (t), the braking means can then be adjusted in order to adjust them.

Advantageously, the test phase also comprises a step of recording a pressure curve Pt = f (t) in the braking means. The curve Pt = f (t) is then compared with the standard pressure curve Pe = f (t). Thus, it will be possible to deepen the diagnosis of the braking means by determining whether the deviations noted between the curves Vec = f (t) and Vtc = f (t) are related to the hydraulic or pneumatic controls.

In one embodiment of the invention, the diagnostic method may also include the preliminary test of the braking means on the facility operating at idle. For this purpose, the recording of a standard vacuum characteristic curve is carried out during the application of the braking means to an installation operating at a vacuum during the preliminary calibration phase. In this case, the standard vacuum characteristic curve is a deceleration curve Vev = f (t) for the illustrated embodiment. Then, during the test phase, a characteristic curve is recorded during the application of the braking means on an installation operating in a vacuum, in this case a deceleration curve Vtv = f (t) in the present case. The characteristic curves Vev = f (t) and Vtv = f (t) are then compared in order to detect a possible bad adjustment of the braking means.

In a second embodiment, not shown, the characteristic curves may also be curves for measuring the force exerted on the cable, the motor torque or a variable characteristic of the motor means and proportional to the force exerted on the cable. to the engine torque. In this case, the control curve corresponds to a curve of deceleration of the cable. Note however that for this embodiment, the interpretation of the comparison between the standard characteristic and test characteristic curves is less easy.

It will also be noted that, in the case of the calibration phase, the driving curve of the motor means F = f (t) is recorded during an application of the braking means on the installation operating under load. Then, during the second step, a standard characteristic curve is then recorded during an application of the braking means on the vacuum driven plant by the motor means controlled in a closed loop by a reference signal formed by the curve. previously registered pilot.

Advantageously, the diagnostic method according to the invention makes it possible to test the adjustment of the various braking means of the installation, such as the electromagnetic brake, the emergency brake or brakes and the service brake or brakes. For this purpose, the method provides for recording for each type of braking means the curves 1, 3, 4, 5, 6 of deceleration Vec = f (t), Vtc = f (t), Vv = f (t) , Vev = f (t), Vtv = f (t) and the control curve 2 of the motor means F = f (t). Thus, the adjustment of each braking means can be tested independently.

In order to establish an accurate diagnosis of the braking means, it is advantageous for the position of the vehicle or vehicles on the cable to be indexed in a precise manner so that all the applications of the braking means are carried out. for the purpose of this process be performed for similar load distributions on the cable.

Furthermore, it will be noted that when the braking means to be tested does not operate in all or nothing mode, the application of the braking means will, in the context of the diagnostic process, be at identical levels.

It will also be noted that when the braking means are means controlled by a modulation of the force as a function of the deceleration of the line, it is necessary to suspend the modulation before carrying out the diagnostic method of the braking means.

However, the simulation method according to the invention also makes it possible to diagnose the modulation of the force as a function of the deceleration of the line. Indeed, when controlling the motor means closed loop by a setpoint signal formed by a control curve F = f (t) which is a deceleration curve. The modulation device can be tested by varying the control curve F = f (t) with respect to a control curve Fe = f (t) recorded during the calibration phase and observing the response of the modulation device.

The mathematical demonstration to validate the diagnostic process described above is as follows:

Avec:

• Fc : force générée par la charge de l'installation en charge ;
• Ffe : force de freinage étalon
• M : masse du câble et des véhicules ; et
• α : accélération du câble.

During the preliminary phase, when the braking means is actuated on the installation operating at no load and Vec = f (t) is recorded, the following relation can be written: $$\mathrm{Fc}\mathrm{+}\mathrm{FfE}\mathrm{=}\mathrm{Mc}\mathrm{*}\mathrm{\alpha ec}$$

With:

• Fc: force generated by the load of the installation under load;
• Ffe: standard braking force
• M: mass of cable and vehicles; and
• α: acceleration of the cable.

Avec:

• Fv : force générée par la charge de l'installation à vide.

Likewise, when the braking means is actuated on an installation operating in a vacuum, the following relation can be written; $$\mathrm{Fv}\mathrm{+}\mathrm{FfE}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha v}$$

With:

• Fv: force generated by the load of the vacuum system.

ou $$\mathrm{Fmot}\mathrm{=}\mathrm{Mv}\mathrm{*}\mathrm{\alpha ec}\mathrm{-}\mathrm{Fv}\mathrm{-}\mathrm{Ffe}$$

avec Fmot : force générée par le moteur.During the preliminary calibration phase, when controlling the motor means with as a reference signal, the deceleration curve 1 Vec = f (t), the following relation can be written: $$\mathrm{fmot}+\mathrm{Fv}\mathrm{+}\mathrm{FfE}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha ec}$$

or $$\mathrm{fmot}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha ec}\mathrm{-}\mathrm{Fv}\mathrm{-}\mathrm{FfE}$$

with Fmot: force generated by the motor.

Finally, during the test phase, when controlling the motor means with the control curve 2 F = f (t) and measuring the curve 3, 4, 5 Vtc = f (t), we can write the following relation: $$\mathrm{fmot}+\mathrm{Fv}\mathrm{-}\mathrm{fft}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha tc}$$

$$\mathrm{Mv}\mathrm{*}\mathrm{\alpha ec}\mathrm{-}\mathrm{Ffe}\mathrm{-}\mathrm{Fft}\mathrm{=}\mathrm{Mv}\mathrm{*}\mathrm{\alpha tc}$$

We replace Fmot of the relation c ': $$\mathrm{mv}\mathrm{*}\mathrm{\alpha ec}\mathrm{-}\mathrm{Fv}\mathrm{-}\mathrm{FfE}\mathrm{+}\mathrm{Fv}\mathrm{-}\mathrm{fft}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha tc}$$

$$\mathrm{mv}\mathrm{*}\mathrm{\alpha ec}\mathrm{-}\mathrm{FfE}\mathrm{-}\mathrm{fft}\mathrm{=}\mathrm{mv}\mathrm{*}\mathrm{\alpha tc}$$

Thus, if the curves Vec = f (t) and Vtc = f (t) are similar then αec = αtc. Therefore, the braking force of the tested braking means is equal to the braking force of the braking means: Fft = Ffe. In this case, the braking means is set.

Claims (15)

1. Method for simulating the braking of a cable-transport installation comprising at least one braking means and driving means, characterized in that the simulation method comprises at least one step of applying the braking means on the installation by the driving means controlled in a closed loop by a set-point signal formed by a predetermined control curve (2) F=f(t).
2. Method for simulating according to Claim 1, characterized in that, for the closed-loop control, the set-point signal is compared with a measurement of the force exerted on the cable, of the drive torque or of a variable characteristic of the driving means and proportional to the force exerted on the cable, to the drive torque or to the instantaneous power delivered by the driving means.
3. Method for simulating according to Claim 1, characterized in that, for the closed-loop control, the set-point signal is compared with a measurement of the speed of the cable.
4. Method for diagnosing at least one braking means of a cable-transport installation comprising driving means, the method for simulating comprising at least one phase for testing the braking means, characterized in that the phase for testing the braking means comprises at least one simulation phase via the simulation method according to Claims 1 to 3 carried out on an installation operated when empty and the recording of a characteristic test curve (4, 5, 6).
5. Method for diagnosing according to Claim 4, characterized in that the phase for testing also comprises a second step of comparing the characteristic test curve (4, 5, 6) with a prerecorded characteristic benchmark curve (1).
6. Method for simulating according to either one of Claims 4 and 5, characterized in that it also comprises a preliminary benchmarking phase comprising at least:

   - a step of recording the characteristic benchmark curve (1) during an application of the braking means on the installation operating under load; and

   - a step of recording the control curve (2) of the driving means F=f(t) during an application of the braking means on the installation operated when empty by the driving means controlled in a closed loop by a set-point signal formed by the said characteristic benchmark curve (1).
7. Method for simulating according to either one of Claims 4 and 5, characterized in that it also comprises a preliminary benchmarking phase comprising at least:

   - a step of recording the control curve (2) of the driving means F=f(t) during an application of the braking means on the installation operating under load; and

   - a step of recording the characteristic benchmark curve (1) during an application of the braking means on the installation operated when empty by the driving means controlled in a closed loop by a set-point signal formed by the said control curve (2).
8. Method for simulating according to any one of Claims 4 to 7, characterized in that the characteristic curves are curves of deceleration of the cable.
9. Method for simulating according to Claim 8, characterized in that the recording of the control curve (2) of the driving means F=f(t) is carried out by a measurement of the force exerted on the cable, of the drive torque or of a variable characteristic of the driving means and proportional to the force exerted on the cable, to the driving torque or to the instantaneous power delivered by the driving means.
10. Diagnostic method according to any one of Claims 4 to 7, characterized in that the characteristic curves are curves of measurement of the force exerted on the cable, of the driving torque or of a variable characteristic of the driving means and proportional to the force exerted on the cable, to the driving torque or to the instantaneous power delivered by the driving means.
11. Diagnostic method according to Claim 10, characterized in that the recording of the control curve of the driving means F=f(t) is carried out by a measurement of the deceleration of the cable.
12. Diagnostic method according to any one of Claims 4 to 11, characterized in that the control curve (2) of the driving means F=f(t) is extended by a constant function (7) K = f (t) .
13. Device for controlling a cable-transport installation comprising driving means and at least one braking means, the device comprising means for controlling the driving means, means for controlling the braking means and a safety device, the control device being characterized in that it comprises means for switching the safety device between an active position in which the simultaneous use of the driving means and of the braking means is not allowed, and a passive position in which the said simultaneous use is allowed.
14. Control device according to Claim 13, characterized in that it also comprises means for measuring the speed of the cable.
15. Control device according to either one of Claims 13 and 14, characterized in that it comprises means for measuring the intensity of the current passing through the driving means.

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