Distributing an additional medium to improve the holding of the braking distance for a rail vehicle

Abstract

The invention relates to a device (1) for outputting adhesion medium for use on a rail vehicle (S) and a corresponding method. Independently of state variables of the rail vehicle (S) or of the track (G), a jump in the output of adhesion medium is outputted in order to improve the adhesion between the wheel (R1) and the track (G), the jump outputting a defined, unregulated quantity of adhesion medium. Thus, a defined and unregulated quantity of adhesion medium can be outputted just at the start of braking, which minimizes the braking distance.

Description

TECHNICAL FIELD

[0001] The invention relates to a device for outputting adhesion medium from a rail vehicle onto a rail, in which device a defined, unregulated quantity of adhesion medium is dispensed in response to a specific signal (e.g. lack of adhesion signal), a driver request and / or a specific operating state (e.g. activation of emergency braking), and to a related method. BACKGROUND

[0002] Rail vehicles that travel on steel rails have the advantage that the rolling resistance between the wheels and the rail is comparatively small, which is advantageous in terms of energy. However, the low resistance of the wheel-rail contact significantly limits the ability to accelerate or decelerate, i.e. brake, the rail vehicle using the wheels. If the rail is dry, the possible force transmission is already limited. However, if the rail is dirty, wet or icy, the potential for force transmission is significantly reduced. If braking, and even emergency braking, is carried out under such conditions, the problem arises that the wheels can slip or lock, so that the deceleration requirement (and thus braking) cannot be optimally fulfilled. In addition, the wheels can also be worn or damaged. Thus, in the case of poor adhesion conditions, a reduction in the transmission of braking forces from the braking wheels to the rail in the wheel / rail contact and thus an undesired lengthening of the braking distance results.

[0003] In order to avoid such events, which are also critical to safety, various measures are taken on the infrastructure and on the vehicle. In the vehicle, functions for improving braking in such conditions can be used.

[0004] For example, in the prior art, anti-skid / overspeed protection systems are provided, which can regulate the wheel speed of individual wheels or wheel sets such that the available adhesion (the coefficient of the transmissible tangential force in the longitudinal direction of the vehicle relative to the orthogonally acting wheel load) is used as far as possible for vehicle driving, but also for braking.

[0005] Separately from this or in addition, in many rail vehicles there are also mechanisms for influencing (increasing or harmonizing) the adhesion, for example application systems for adhesion medium and thus for adhesion-promoting medium; this can be a sanding device or a spreading device for other adhesion media, such as aluminum oxide. Such adhesion-promoting medium, which can be in the form of a powder, for example, is dispensed in the vicinity of specific wheels of the rail vehicle, the effect of which is to improve the adhesion between the wheels and the rail.

[0006] In the prior art, for example, the document DE 601 24 993 D2 is known, which discloses a sanding device for a rail vehicle. Here, compressed air is used to spray sand between the wheel and the rail in order to improve the adhesion between the wheel and the rail and to prevent excessive slipping. For example, the injection pressure of the compressed air can be varied depending on the driving wind.

[0007] Furthermore, it is known from the document DE 10 2018 209 920 B3 that the adhesion value between the rail and the wheel decreases when there is moisture on the rail. A method for predicting the adhesion value in the contact point between the rail and the rolling wheel is also disclosed here; for this purpose, a plurality of environmental parameters are taken into account, such as air pressure, air temperature and air humidity.

[0008] Furthermore, the document DE 41 37 546 C2 is known in the prior art, in which a method for determining the driving speed of a rail vehicle is disclosed. In order to calculate the driving speed, the static friction coefficient between the wheel and the rail is measured and the braking force of the rail vehicle can be adapted by a microcomputer, so that a wheel lock is avoided.

[0009] Furthermore, the document WO 2000 / 071399 A1 is known in the prior art. This describes a method for increasing the wheel / rail adhesion or wheel / rail adherence of a rail vehicle. If the adhesion between the wheel and the rail in the rail vehicle is insufficient, the wheel can slip when braking. When such excessive slipping is determined, the control system can reduce the brake pressure to allow a controlled degree of slipping and thus optimize the braking force for the available adhesion. By determining the pressure supplied to the brake cylinder, a signal indicating the adhesion value can be obtained. Alternatively, the adhesion can be monitored by determining the difference between the brake deceleration requested by the driver and the observed deceleration. The adhesion signal can trigger a warning. It can also be used to set the rate at which sand is delivered to the wheel / rail interface. The rate at which sand is supplied can also be set in dependence on other parameters such as train speed.

[0010] Therefore, sanding devices are mainly known in the prior art, in which the sanding is adjusted depending on a plurality of parameters. Therefore, an adjustment circuit is usually provided.

[0011] Therefore, the application system controls the material flow mainly in relation to time. In particular, the material flow of the adhesion-promoting medium is limited based on standards / regulations which can differ from region to region. By limiting the material flow of the adhesion-promoting medium, rail circuit interruptions should be avoided and the operational readiness of the switch system should be improved. The material flow can also be adjusted depending on the speed, but this leads to a large consumption of adhesion-promoting medium.

[0012] At each braking, the braking distance depends on the braking exit speed: the higher the braking exit speed, the longer the braking distance - it is important to transfer the generated braking force onto the track as quickly as possible during braking, because at high speeds and also during the build-up time of braking forces or measures to improve adhesion, large (braking) distances are covered. If the force transfer is negatively affected by poor track conditions (e.g. fallen leaves, ice), measures to improve adhesion are activated as quickly as possible even at low speeds to limit this extension of the braking distance. SUMMARY

[0013] It is therefore an object of the present application to provide a device for outputting adhesion-improving medium for a rail vehicle, in which device the braking distance can be minimized by building up the required adhesion as quickly as possible, wherein the life cycle costs (LCC) of the rail vehicle are also minimized, but there is still a sufficient level of performance or safety.

[0014] To this end, the present application proposes a device for outputting adhesion-improving medium for use on a rail vehicle, the adhesion-improving medium being assigned to at least one wheel of the rail vehicle, wherein the device is adapted to output a defined, unregulated amount of adhesion-improving medium in the event of a signal being obtained.

[0015] The present application also proposes a method for outputting adhesion-improving medium between at least one wheel of a rail vehicle and a track on which the rail vehicle is travelling, the method comprising the following steps:

[0016] a) checking whether a control device has received a signal;

[0017] b) if the signal is received in step a): outputting, by means of a device for outputting adhesion-improving medium, a defined, unregulated amount of adhesion-improving medium onto the track.

[0018] The device for outputting adhesion-improving medium for use on a rail vehicle according to the present application, the adhesion-improving medium being assigned to at least one wheel / wheel set of the rail vehicle and the device being adapted to output a defined, unregulated amount of adhesion-improving medium in the event of a signal being obtained.

[0019] By means of the defined amount of adhesion-improving medium, the maximum possible or permissible material flow of the adhesion-improving medium is initially activated (e.g. the permissible material flow can depend on the vehicle speed) - the maximum material flow can be limited, for example, by a stipulation or by the technical feasibility of the system - this is the so-called Inshot. The wheel therefore regains a sufficiently good or as good as possible adhesion situation as quickly as possible.

[0020] This achieves: minimization of brake distance extension (e.g. due to fallen leaves, ice), reduction of wheel wear by avoiding long skids / sliding at too high relative speeds and reduction of consumption of the used material of adhesion due to the shortened brake distance.

[0021] This jump is independent of other monitoring functions of the deceleration or adhesion that are activated during braking - thus there is no need to adjust the jump amount.

[0022] Preferably, the predefined amount of adhesion-enhancing medium is dispensed in pulses (i.e. e.g. in rectangular pulses of 2 seconds).

[0023] Further preferably, the predefined amount of adhesion-enhancing medium is independent of current state variables of the rail vehicle or of the track, e.g. rail vehicle speed, track temperature, ice film, etc. This also facilitates the introduction of the adhesion-enhancing medium independently of the regulating device - here the output amount must first be calculated and is long-lasting until a sufficiently large output amount is applied to the track. Due to the feasibility of the adhesion-enhancing medium jump, the reaction and calculation time of the regulating device is not important and the adhesion-enhancing medium can be output quickly to the track.

[0024] Preferably, the signal that leads to the jump of the adhesion-enhancing medium can be requested by the driver, triggered by a lack of adhesion between at least one wheel and the track and / or by an operating mode (e.g. emergency braking).

[0025] However, the jump of the adhesion-enhancing medium is not limited to the braking process, it can also take place in the operating mode of traction.

[0026] In general, the function can be coupled in particular with the operating state of emergency braking, i.e. is activated automatically when emergency braking, which is advantageous for safety.

[0027] Preferably, a device for outputting adhesion-enhancing medium also comprises:

[0028] - a control device, which receives a signal;

[0029] - an accumulator, which can be connected to a compressed air source by a first shut-off valve or a limiting device (e.g. a nozzle, orifice or limiting valve, which only allows a limited or under certain conditions passage of air);

[0030] - a container for adhesion-enhancing medium, which is connected to the accumulator by a second shut-off valve; and

[0031] - an output nozzle, which is connected to the container for adhesion-enhancing medium.

[0032] The control device is designed to quickly and completely open the second shut-off valve in the event of receipt of a signal, in order to guide compressed gas from the accumulator into the container, where the adhesion-enhancing medium is received and can be delivered through the output nozzle.

[0033] Thus, using a predefined gas volume, almost always the same amount of tackifier is delivered. This volume of the pressure accumulator can for example easily be adapted structurally to a standard or regulation for the maximum output of tackifier per unit of time. Since the second shut-off valve can be opened quickly and completely and can discharge the pressure in the pressure accumulator, it is ensured that the tackifier can be applied quickly to the track - in this case without having to wait for the pressure build-up of an adjustable valve connected to the regulating device.

[0034] After the jump, the second shut-off valve can be closed again, then the first shut-off valve can be opened briefly, so that the pressure in the pressure accumulator can be built up again.

[0035] Alternatively, the second shut-off valve can also be operated in a regulated and in a non-regulated manner - in the regulated operation the opening degree can vary, in the non-regulated operation the valve can only assume the "closed" and "open" states.

[0036] Alternatively, a device for outputting tackifier preferably comprises:

[0037] - a control device, which receives a signal;

[0038] - a container for tackifier;

[0039] - a mechanical application device, for example a latticed wheel, which is connected to the container for tackifier; and

[0040] - an output nozzle, which is connected to the mechanical application device.

[0041] The control device is designed to increase the rotational speed of the mechanical application device to the maximum possible rotational speed in the event of receipt of the signal, whereby the tackifier can be delivered through the output nozzle.

[0042] The control device can also preferably preset the mechanical application device to run at the maximum possible rotational speed for a certain period of time - thus a defined, non-regulated amount of tackifier can also be output, which is almost the same for each jump.

[0043] The method for outputting tackifier according to the invention comprises the following steps:

[0044] a) checking whether a signal is received from the control device;

[0045] b) if a signal is received in step a): outputting a defined, non-regulated amount of tackifier onto the track by means of the device for outputting tackifier.

[0046] This achieves minimization of brake distance elongation (which can be caused, for example, by fallen leaves or ice), reduction of wheel wear due to long sliding times / sliding at too high relative speeds, and reduction of consumption of the used adhesion material due to brake distance shortening.

[0047] Such a jump is independent of other monitoring functions of the adhesion hysteresis that are activated during braking - so that no adjustment of the jump quantity is necessary.

[0048] Further preferably, the method for outputting adhesion medium according to the application also comprises the following steps:

[0049] c) waiting (for example for a period of time) until a predetermined criterion is met;

[0050] d) after the criterion has been reached: further output of adhesion medium onto the track, the amount of adhesion medium output per unit of time / per line of distance being adjusted by the adjustment device.

[0051] An adjustment that is dependent on the speed is also possible, the amount of adhesion medium being the adjustment variable, which is a function of the speed.

[0052] Here, in step d) the adhesion medium is output again after the jump, but in an adjusted manner. Thus, in steps a) to c) the adhesion medium is always output in a defined, non-adjusted amount, without the current vehicle state parameters (speed, achieved braking effect, slip, etc.) being taken into account here. From step d) onwards, however, the adjustment system takes over the adjustment of the amount of adhesion medium output - for example the amount of adhesion medium output per time period and / or the total output of adhesion medium, which is required for the specific braking process (here, variables such as vehicle speed, slip, etc. play a role). This has the advantage that initially the maximum possible or permissible material flow is activated by the jump, so that the best possible adhesion situation between the vehicle and the track is present as quickly as possible and the brake distance can be shortened. At a later point in time, however, the further amount of adhesion medium to be output is fine-tuned by the adjustment device - whereby it is possible to save adhesion medium, since the adjustment device recognizes when no or less adhesion medium is to be output and then stops or reduces the output accordingly (and increases it again if necessary).

[0053] Preferably, in step c) the predetermined criterion is the achievement of a predetermined period of time, the achievement of a predetermined vehicle speed, the achievement of a predetermined vehicle deceleration, the achievement of a predetermined adhesion level on at least one wheel / wheel set of the track vehicle and / or a driver request. Various criteria can thus be preset, at the achievement of which the adjustment device for adjusting the amount of adhesion medium distribution is activated and takes over the adjustment of the amount of adhesion medium distribution until the end of the braking process or until the acceptable adhesion conditions between the vehicle and the track are achieved.

[0054] Preferably, in step d), the output quantity of adhesion medium per unit of distance and / or the output quantity of adhesion medium per unit of time is adjusted by means of one of the following variables: the acceleration of the rail vehicle in the longitudinal direction of the vehicle, the time profile of the wheel speed or the ratio of the wheel speed to the rail vehicle speed of the wheel, the time profile of the wheel acceleration or the ratio of the wheel acceleration to the acceleration / deceleration in the longitudinal direction of the rail vehicle, the ratio of the target torque to the actual torque acting on the wheel.

[0055] Preferably, a device for outputting adhesion medium according to the first embodiment described above is used, wherein, in step b), the control device opens the second shut-off valve so that compressed gas from the pressure accumulator is introduced into the container, where the adhesion medium is received and can be delivered through the output nozzle - preferably over a period of time or until there is no longer any overpressure.

[0056] Alternatively, a device for outputting adhesion medium according to the second embodiment described above is used, wherein, in step b), the control device increases the rotational speed of the segmented wheel to the maximum possible rotational speed and holds it for a predetermined period of time, whereby a defined, unregulated quantity of adhesion medium can be delivered through the output nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0057] Embodiments of the application are described in more detail below with the aid of the drawings.

[0058] Figure 1 A diagram showing a system according to the prior art, in which the sand quantity (here sand is used as adhesion medium) and the deceleration are shown as a function of the speed.

[0059] Figure 2 A diagram showing a system according to the application, in which the sand quantity and the deceleration are shown as a function of the speed.

[0060] Figure 3 A diagram showing the improvement achieved with a system according to the application compared to a system according to the prior art.

[0061] Figure 4a A diagram showing a first embodiment of a device for outputting adhesion medium on a rail vehicle.

[0062] Figure 4b A variant of a first embodiment of a device for outputting adhesion medium on a rail vehicle.

[0063] Figure 5 A diagram showing a second embodiment of a device for outputting adhesion medium on a rail vehicle. DETAILED DESCRIPTION

[0064] In Figure 1The behavior of a system according to the prior art is shown in Fig. 1, here the applied sand quantity m and the deceleration a as a function of the speed.

[0065] At the start speed v Start a signal is emitted to adjust the sand quantity, the applied sand quantity m is increased slowly ("lagging" behind the target quantity) and then again decreased (similar to the target quantity). The actual deceleration a Ist is increased similarly to the applied sand quantity and then likewise asymptotically reaches the value of the target deceleration a Soll . Here, there is a reduced deceleration before the full sand action is established, i.e. only when enough sand quantity has been applied (to reach the target sand quantity) is a sufficiently large actual deceleration a Ist achieved. However, since the system requires a certain time to apply the required target sand quantity (sand-establishment), the target deceleration a Soll is also reached for a certain time. If there is a discrepancy between the target deceleration a Soll and the actual deceleration a Ist subsequently, the sand quantity can also be readjusted accordingly, as shown in the left area of the diagram.

[0066] In Figure 2 Fig. 2 a system according to the application is shown. Here, a so-called jump of the adhesion medium is performed at the initial speed v Start , in the present case as a square wave signal. Thereby, thus an initially large sand quantity m is applied, by which a prolongation of the braking distance is to be avoided. Thus, at the beginning of the braking process there is enough adhesion medium available between the wheel and the track so that the desired deceleration can be achieved quickly. The actual deceleration a Ist rises abruptly and quickly reaches the asymptotic value of the target deceleration a Soll . The applied sand quantity m also increases abruptly and then decreases slowly again and then until it is reduced to the target value (which is adjusted) in order to save sand.

[0067] In an advantageous embodiment, the applied sand quantity m is reduced as soon as the actual deceleration a Ist is reached and finally, the sand quantity required in the situation is reached and applied, which is adjusted by the adjusting device. In the right area of the diagram, the applied sand quantity is output as a jump and is not adjusted - but also a defined and not adjusted sand quantity is output. In the left area of the diagram, the output sand quantity is adjusted and finally approaches the sand quantity required in the situation (which depends on a plurality of parameters and is adjusted in accordance with these parameters). The areas of the unadjusted and adjusted operating mode change depending on the step response.

[0068] If there is a discrepancy between the target deceleration a Soll and the actual deceleration a IstIf there is a difference, the sand quantity can also be readjusted accordingly, as shown in the left-hand region of the diagram.

[0069] Figure 3 The difference between the actual deceleration with and without the jump is shown. It can be seen that the target deceleration a Soll is reached quickly with the jump, whereas in a system according to the prior art it takes a certain time, which is why the braking distance here is also longer.

[0070] It is thus shown that, particularly in the region immediately after the start of braking, a system adapted for outputting a jump has clear advantages - precisely this region is important for the shortening of the braking distance.

[0071] The reduction in the sand quantity after the jump can take place in different ways, for example continuously or in stages until the desired sand quantity, or continuously or in stages until the start of an adjustment, in which the sand quantity can be adjusted on the basis of one or more measured further parameters.

[0072] Figure 4a A first embodiment of a device 1 for outputting a friction- enhancing medium for a rail vehicle is shown.

[0073] On the rail vehicle itself there is a wheel R1, in front of which an output nozzle 5 is mounted, which is adapted for outputting the friction-enhancing medium. The output nozzle 5 is in turn connected by a line to a container 3 for the friction-enhancing medium. There is also a control device 2, which can receive a signal SG. The signal SG can be a driver request, i.e. the driver can press a button / switch in order to output the signal, but the signal SG can also be an adhesion deficiency signal (measured, for example, by a sensor) or can be output automatically when an operating signal is obtained, for example at the start of an emergency brake. The container 3 is connected to a compressed air source D by two parallel lines L1, L2. An adjustment valve 6 is integrated into the second line L2 and is connected to an adjustment device 9, which in turn is connected to the control device 2. According to a control signal of the control device 2, the adjustment device 9 is activated, which controls the adjustment valve 6 to open up to a certain degree, so that compressed air can flow from the compressed air source D into the container 3, where the friction-enhancing medium is received and delivered by the output nozzle 5. According to the degree of opening of the adjustment valve 6, the quantity of friction-enhancing medium delivered by the output nozzle 5 can be adjusted.

[0074] A first line LI is also provided in parallel to the second line L2, which also connects the container 3 to the compressed air source D. Here, however, a pressure accumulator 4 is also provided between the container 3 and the compressed air source D, which is respectively defined by the first and second shut-off valves 7a and 7b. If the shut-off valve 7b is closed and the shut-off valve 7a is open, compressed air can flow from the compressed air source D into the pressure accumulator 4, which can thus be filled. The first shut-off valve 7a can then be closed.

[0075] If a signal SG of the control device 2, which can respectively control the shut-off valve 7b, is present, the shut-off valve can suddenly be opened and the compressed air contained in the pressure accumulator 4 can suddenly flow into the container 3, where the augmenting medium is received and pulsedly conveyed through the output nozzle 5. For this, no regulating device 9 is required. Thus, a predefined quantity of an impulse of augmenting medium can be conveyed very quickly through the output nozzle 5 - if this is to be carried out by the second line L2 with the regulating valve 6, first a certain time elapses until there is sufficient pressure to receive a large quantity of augmenting medium in the container 3 and to convey the augmenting medium through the output nozzle 5. Since the pressure is built up in the pressure accumulator 4, this pressure is set to receive the maximum quantity of augmenting medium, so that the impulse or the jump of augmenting medium can be output very quickly at this control. If the braking has been further advanced, a further dispensing of augmenting medium can take place by the second line L2 and the regulating valve 6 - so that the dispensing of augmenting medium can be regulated and thus, in an advantageous embodiment, reduced when the first effect of the jump has already occurred.

[0076] Alternatively, it is possible to replace the first shut-off valve 7a by a limiting device 7a', for example a nozzle or an orifice with a very high flow resistance. If the pressure accumulator 4 is suddenly pressure- unloaded, practically no air will flow through this nozzle or orifice - but the pressure accumulator 4 will then again be gradually filled.

[0077] A solution with multiple lines LI, L2, L3,... Ln is also possible; here, for example, multiple pressure accumulators 4, 4', 4", 4 n (not shown here).

[0078] Figure 4b A variant of the first embodiment is shown. Here, there is only one line LI. Here, the second shut-off valve 7b can also be additionally regulated by the regulating device 9. In unregulated operation, the control device 2 presets an extended opening or a defined opening or a complete opening or a complete closing of the second shut-off valve 7b - without using the regulating device 9. This mode of operation is provided for the jump of augmenting medium.

[0079] In the regulated mode of operation, the regulating device 9 is activated and the second shut-off valve 7b can also assume a state between full opening and full closing of the second shut-off valve 7b. This mode of operation can be used to apply the adhesion medium in a regulated manner. In the regulated mode of operation, the first shut-off valve 7a must be open in order to be able to supply air from the compressed air source D.

[0080] Figure 5 A second embodiment of the device 1 for outputting an adhesion medium is shown.

[0081] Here, an output nozzle 5 is also provided, through which the adhesion medium can be output in front of the wheel R1. The output nozzle 5 is connected here, however, to a grating wheel 8, which is in turn connected via a line L3 to a container 3 in which the adhesion medium can be stored. If a signal SG is output to the control device 2 such that a jump of the adhesion medium is to take place, the control device 2 automatically actuates the grating wheel 8 at maximum speed, which then very quickly delivers a large amount of adhesion medium, i.e. an adhesion medium pulse, through the output nozzle 5. In this case, the control device 2 controls the speed of the grating wheel 8 alone.

[0082] If, for example, the output of the adhesion medium is to be regulated on the basis of external parameters, for example if the braking is to be further advanced, the control device 2 can activate the regulating device 9, which can variably set the speed of the grating wheel 8 depending on the regulating requirement.

[0083] The invention is not limited to the above-described embodiments - other systems can be envisaged, through which an adhesion medium pulse can also be output through the output nozzle 5, for example through two lines through which compressed air having different pressures can be output.

[0084] The invention relates to a device for outputting an adhesion medium for use on a rail vehicle S and a corresponding method. Irrespective of state variables of the rail vehicle S or of the track G, a jump of the output of the adhesion medium is output in order to improve the adhesion between the wheel R1 and the track G, which jump outputs a defined and unregulated amount of adhesion medium. It is thus possible to output a defined and unregulated adhesion medium just at the start of the braking, which minimizes the braking distance.

[0085] List of reference signs

[0086] 1 device for outputting an adhesion medium

[0087] 2 control device

[0088] 3 container for adhesion medium

[0089] 4 pressure accumulator

[0090] 5 output nozzle

[0091] 6 regulating valve

[0092] 7a, 7b shut-off valve

[0093] 7a' limiting device

[0094] 8 mechanical application device / grating wheel

[0095] 9 regulating device

[0096] S rail vehicle

[0097] R1 wheel

[0098] SG signal

[0099] D compressed air source

[0100] L1 first line

[0101] L2 second line

[0102] G track

Claims

1. Device (1) for outputting adhesion medium for use on a rail vehicle (S), the adhesion medium being assigned to at least one wheel (R1) of the rail vehicle (S), the device being configured for outputting the adhesion medium between the at least one wheel (R1) and the track on which it runs, characterized in that The device (1) is adapted to output a defined, unregulated quantity of adhesion medium in pulse form in the event of a signal (SG) being obtained, the defined, unregulated quantity of adhesion medium being independent of current state data of the rail vehicle (S) and / or of the track (G), The device further comprises: a control device (2), which receives the signal (SG); a container (3) for adhesion medium; a mechanical application device (8), which is connected to the container (3) for adhesion medium; and an output nozzle (5), which is connected to the mechanical application device (8); The control device (2) is designed to increase the rotational speed of the mechanical application device (8) to a defined or maximum possible rotational speed in the event of the signal (SG) being received, whereby the defined, unregulated quantity of adhesion medium can be delivered through the output nozzle (5).

2. The device (1) for outputting an attachment medium according to claim 1, wherein, The signal (SG) can be triggered by a driver request, an adhesion deficiency between at least one wheel (R1) and the track and / or by an operating mode.

3. The device (1) for outputting an attachment medium according to claim 2, wherein, The signal (SG) can be triggered by an emergency brake.

4. Method for outputting adhesion medium between at least one wheel (R1) of a rail vehicle (S) and a track (G) on which the rail vehicle is travelling, using a device (1) for outputting adhesion medium according to any one of claims 1 to 3, the method comprising the following steps: a) checking whether the control device (2) receives a signal (SG); b) if the signal (SG) is received in step a): outputting a defined, unregulated quantity of adhesion medium onto the track (G) in pulse form by the device (1) for outputting adhesion medium, the defined, unregulated quantity of adhesion medium being independent of current state data of the rail vehicle (S) and / or of the track (G), wherein, in step b), the control device (2) increases the rotational speed of the mechanical application device (8) to a defined or maximum possible rotational speed and maintains this rotational speed for a predetermined period of time (tl), whereby the defined, unregulated quantity of adhesion medium can be delivered through the output nozzle (5).

5. Method for outputting adhesion medium according to claim 4, further comprising the following steps: c) waiting until a predetermined criterion is met; d) after the criterion is met: further outputting adhesion medium onto the track (G), wherein the quantity of adhesion medium output per distance and / or the quantity of adhesion medium output per time is regulated by a regulating device (9).

6. The method for outputting an attachment medium according to claim 5, wherein, In step d), after the criterion is met: further outputting adhesion medium onto the track (G), wherein the quantity of adhesion medium output per distance and / or the quantity of adhesion medium output per time is regulated by the regulating device (9) as a function of the speed.

7. The method for outputting an attachment medium according to claim 5, wherein, In step c), the predetermined criterion is a predetermined period of time being reached, a predetermined vehicle speed being reached, a predetermined vehicle deceleration being reached, a predetermined adhesion level on at least one wheel (R1) of the rail vehicle being reached and / or a driver request.

8. The method for outputting an attachment medium according to claim 5, wherein, The amount of adhesive medium output per unit distance and / or the amount of adhesive medium output per unit time in step d) is adjusted in accordance with one of the following variables: the acceleration of the rail vehicle in the longitudinal direction of the vehicle; the time profile of the wheel speed or the ratio of the wheel rotational speed of the wheel (R1) to the speed of the rail vehicle; the time profile of the ratio of the wheel acceleration of the wheel (R1) to the acceleration in the longitudinal direction of the rail vehicle; the ratio of the target torque to the actual torque acting on the wheel (R1).

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