Synchronizing a time-measuring assembly

Abstract

The invention relates to a method for synchronizing a time-measuring assembly comprising at least a first time-measuring device (1) and a second time-measuring device (2), which are connected to each other for radio signal transmission, wherein the first time-measuring device (1) is assigned to a first radio unit (3) and the second time-measuring device (2) is assigned to a second radio unit (4). According to the invention, a data packet (5) having a first item of information regarding a send time is transmitted from the second radio unit (4) to the first radio unit (3), a second item of information regarding a receive time of the data packet (5) is determined by means of the first time-measuring device (1), an asynchrony is determined from the first item of information and the second item of information, a pulling voltage is determined on the basis of the asynchrony and a pulling characteristic of the time-measuring assembly, and the pulling voltage is applied to a first tuning element of the first time-measuring device (1). Precise temporal assignment of events in a radio-based environment is thereby made possible.

Description

[0001] Synchronization of a time recording arrangement

[0002] The invention relates to a method for synchronizing a time recording arrangement comprising at least a first time recording device and a second time recording device which are connected to one another by radio signal transmission, wherein the first time recording device is assigned to a first radio unit and the second time recording device is assigned to a second radio unit.

[0003] In many mechanical engineering, construction engineering, electrical engineering or acoustic applications etc. (for example for vibration analyses on large machines, motors, generators, buildings or for sound analyses with spatially widely distributed microphones etc.) a temporal synchronization of time recording devices may be necessary.

[0004] For example, in order to reduce wear and maintenance effort on the running gear of rail vehicles based on diagnostic and / or monitoring processes, sensors (e.g. for determining temperatures, mechanical stresses, electromagnetic fields, electrical voltages or vibrations, etc.) can be connected to the running gear. In many application areas, precise knowledge of measurement times is necessary to measure relevant parameters on a running gear. This is because, for example, measurement data is often transmitted via communication interfaces and / or measurement events have to be evaluated in their chronology. In the case of radio devices with sensors, for example, in contrast to a device with sensors that are connected to a central unit via cables, several sensors share a transmission medium (e.g. a frequency range or a time period).With such radio devices, the times of measurement events must be determined directly in or on the sensors. Precise synchronization of individual time recording devices is particularly relevant for such radio devices, since precise temporal assignment of measurement events is often required (for example, to distinguish whether vibrations of neighboring wheel sets on a fast-moving rail vehicle are caused by chassis damage or track damage, etc.).

[0005] There is also often a need for radio devices that have low energy consumption.

[0006] EP 4 002 697 A1, for example, is known from the prior art, which describes a device and a method for detecting temporal clock jitter of an output clock signal in a phase-locked loop (PLL). The device comprises a phase comparison module with a phase comparator and a measurement module, a loop filter, a voltage control oscillator, a feedback divider, and a jitter evaluation module. Jitter is detected and output based on a metastability analysis in the phase comparator.

[0007] Furthermore, WO 2019 / 219756 A1 discloses a method and a device for diagnosing and monitoring vehicles, vehicle components, tracks, and track components. Measurements are performed using a sensor, which are then evaluated in a computing unit. Based on the sensor signals, classifications or predictions are performed, and technical condition indicators are generated from them. The condition indicators are transmitted wirelessly from a vehicle to an infrastructure-side facility.

[0008] The invention is based on the object of specifying a robust synchronization of a time recording arrangement which is further developed compared to the prior art and which can be used in a radio device and enables a long service life and energy-saving operation of the radio device.

[0009] According to the invention, this object is achieved by a method according to claim 1, in which at least one data packet with a first piece of information regarding a transmission time of the data packet is transmitted from the second radio unit to the first radio unit, by means of the first time recording device a second piece of information regarding a reception time of the data packet received by the first radio unit is determined, from the first piece of information and the second piece of information an asynchronicity between the first time recording device and the second time recording device is determined, on the basis of the asynchronicity and a pulling characteristic of the time recording arrangement an electrical pulling voltage is determined,and to synchronize the first time-recording device with the second time-recording device, a first tuning element of the first time-recording device, connected to a first oscillating element of the first time-recording device, is subjected to the drawing voltage, thereby influencing the oscillating behavior of the first oscillating element. This is a particularly precise synchronization method, which enables, for example, a precise temporal assignment of sensor measurement events in a radio-based measuring device and a temporal comparison of these sensor measurement events. This also makes it possible, for example, to start measurement processes of several sensors of the measuring device synchronously.

[0010] Furthermore, frequency errors or frequency drift of the first oscillating element can be corrected, for example, by detuning the first oscillating element. The first radio unit can therefore generate signals that are phase-synchronized with the second time recording device. Because frequency errors or frequency drift can be corrected, technical requirements for the first oscillating element can be reduced, whereby, for example, oscillating elements or oscillators can be selected for the first time recording device which, although not highly precise, only have moderate energy consumption. It is therefore possible, for example, to supply the first radio unit with power from a battery with a low charge and compact dimensions and / or to design the first radio unit as an energy harvesting unit, etc.

[0011] The synchronization method makes it possible for the first radio unit or the first time recording device to estimate the start times of transmission processes of radio data packets in a radio device with a high degree of accuracy. The first radio unit can be switched on shortly before a transmission process. It is therefore possible to switch the first radio unit on and off in a targeted manner. Tolerance times, which can be provided in order to guarantee reliable reception of radio data packets, can be reduced or the tolerance times can be dispensed with. This makes it possible to increase intervals between transmission processes of individual radio data packets (e.g. to a value of 30 s or significantly more than 30 s) and / or reduce radio data packet lengths. This reduces the energy consumption of the radio device.By reducing the length of radio data packets, for example, the time periods during which high-frequency components of the second radio unit, which often consume high power, must be switched on can be reduced. In a measuring device, for example, a large portion of the stored energy can be used for measuring processes.

[0012] A pulse duration, which characterizes a radio data packet length, can, for example, have a value between 10 ps and a few milliseconds. Furthermore, the method according to the invention can be implemented without great effort, and retrofitting solutions are also conceivable.

[0013] Further advantageous embodiments of the method according to the invention emerge from the subclaims.

[0014] It is advantageous, for example, if the pulling voltage is set by means of a first voltage converter of the first time recording device. By means of the first voltage converter, which can be designed, for example, as an inverting boost converter and with which different electrical voltages can be set, the pulling voltage can be applied to a capacitance diode as a tuning element, for example. The pulling voltage generated by the first voltage converter does not drop significantly over a longer period of time (for example over several minutes), which is why the first radio unit does not require any additional power supply even over a longer inactive phase (e.g. lasting 30 s). With each radio data packet which contains new synchronization information, the required pulling voltage can be determined anew and set by means of the first voltage converter.

[0015] Adaptation to a deterioration of synchronism between the first time recording unit and the second time recording unit is made possible if a synchronization interval of the first time recording device is reduced with increasing asynchronism.

[0016] This measure avoids violations of requirements regarding synchronicity accuracy.

[0017] A further preferred solution is to monitor temperatures of at least the first radio unit. For example, temperatures of the first time recording device can be measured.

[0018] This measure allows for predicting inaccuracies in synchronization due to temperature differences (so-called temperature drift). For this purpose, the first radio unit can, for example, have a temperature sensor. Reducing or avoiding these inaccuracies based on a prediction can be achieved, for example, by shortening the synchronization interval when a measured temperature exceeds or falls below a temperature threshold.

[0019] Precise tuning while maintaining stable operating behavior of the first oscillating element is achieved if an oscillating frequency of the first oscillating element is varied by an absolute value of up to 200 ppm of a natural frequency of the first oscillating element by means of the drawing voltage.

[0020] By varying the oscillation frequency by an absolute value of up to 200 ppm (parts per million) of the natural frequency of the first oscillating element, temperature drift, long-term drift and frequency offsets of the first time recording device can be treated with high effectiveness by a synchronization process.

[0021] A promising field of application for the method according to the invention is opened up with a radio device which is set up to carry out the method according to the invention, comprising at least a first radio unit with at least one first time recording device and a second radio unit with at least one second time recording device, wherein at least the first time recording device has a first pulling circuit for applying an electrical pulling voltage for a first oscillating element of the first time recording device to a first tuning element of the first time recording device. This enables precise synchronism between the first time recording device and the second time recording device.Subsequent correction of an asynchronicity between the first time recording device and the second time recording device (for example via a computer program) is not necessary. Due to the precise synchronicity, the radio device can be used, for example, for measuring processes in which an exact temporal assignment of measuring events is required. Such measuring processes can be carried out radio-based; a cable-based measuring or transmission device is not required. In addition to the first radio unit and the second radio unit, further radio units can, for example, be integrated into the radio device and form a radio network.

[0022] It is advantageous if the second time recording device has a second pulling circuit for applying an electrical pulling voltage for a second oscillating element of the second time recording device to a second tuning element of the second time recording device.

[0023] This measure also allows the second time recording device to be precisely synchronized (for example, to a time signal from a satellite-based time recording device). This makes it possible, for example, to synchronize the first time recording unit to an external reference time, which facilitates, for example, a temporal comparison of measurement results.

[0024] An advantageous solution is achieved if at least the first time recording device has a first microcontroller which is connected to the first pull-in circuit. This measure enables easy access by the microcontroller to highly synchronous signals from the first time recording device. Events can be triggered in a time-controlled manner or the times of events can be determined via the microcontroller (e.g. using interrupt commands). Any computer program for controlling the microcontroller can be implemented simply, since the transmission or reception of radio data packets can be controlled in a straightforward manner using basic functions of the microcontroller.

[0025] A high frequency accuracy can be achieved if at least the first oscillating element is designed as a quartz oscillator.

[0026] A radio-based measuring device with which measuring events can be triggered and / or assigned precisely in time is realized if at least the first radio unit comprises at least one sensor which is connected to the first time recording device or which has the first time recording device.

[0027] For example, if the sensor can record a series of measurements and, for example, a sampling rate implemented using a sensor oscillator is inaccurate for this series of measurements, the times of measurement events can be compared with the times of the first time recording device and determined accordingly. Measurement data can also be interpolated to a time grid, which can be derived, for example, from the times of the synchronized first time recording device.

[0028] A promising field of application for the radio device according to the invention is opened up with a rail vehicle with at least one radio device according to the invention.

[0029] A preferred solution is achieved here if the at least one radio device is used in a diagnostic and / or monitoring device for at least one running gear of the rail vehicle and / or for a track. In particular, diagnostic and / or monitoring devices for running gear of rail vehicles or for tracks often require time-synchronized measurements, a precise temporal assignment of measurement events and / or a temporal comparison of measurement results (e.g. for the precise detection, identification and / or evaluation of errors, malfunctions or damage to a running gear or of damage or position errors to a track, etc.). Furthermore, for such diagnostic and / or monitoring devices, a determination of the positions of frequency components of measurement series is often necessary. Such requirements can be met with high effectiveness by the radio device according to the invention.Retrofitting the radio device according to the invention is easy to implement, since laying cables is not necessary. It is also possible to expand the radio device according to the invention in a modular manner, for example by adding further radio units (e.g., on chassis or other components of the rail vehicle) to the first radio unit and the second radio unit. Replacing individual radio units (e.g., for maintenance, servicing, or repair reasons) is also possible with only moderate effort.

[0030] With particularly precise temporal allocation of impact events, it is conceivable, for example, to allocate effects caused by structure-borne sound waves propagating in a chassis. The invention is explained in more detail below using exemplary embodiments.

[0031] It shows, for example:

[0032] Fig. 1: A flowchart of an exemplary embodiment of a method according to the invention for synchronizing a time recording arrangement,

[0033] Fig. 2: A schematic representation of an exemplary first embodiment of a radio device according to the invention comprising a first radio unit with a first time recording device and a second radio unit with a second time recording device, wherein the first radio unit receives a data packet from the second radio unit, and

[0034] Fig. 3: A schematic side view of an exemplary embodiment of a rail vehicle according to the invention with an exemplary second embodiment of a radio device according to the invention, which is used in a diagnostic and monitoring device for a chassis of the rail vehicle and a track.

[0035] Fig. 1 shows a flow chart for an exemplary embodiment of a method according to the invention for synchronizing a time recording arrangement, which is used in a diagnostic and monitoring device of a rail vehicle, as shown by way of example in Fig. 3.

[0036] The time recording arrangement comprises a first time recording device 1 and a second time recording device 2, as shown by way of example in Fig. 2 and which are connected to one another by radio signals. The first time recording device 1 is assigned to a first radio unit 3, and the second time recording device 2 is assigned to a second radio unit 4. The first radio unit 3 and the second radio unit 4 are shown in Fig. 2 and Fig. 3.

[0037] To synchronize the first time recording device 1 with the second time recording device 2, a data packet 5 shown as an example in Fig. 2 with a first information regarding a transmission time of the data packet 5 is first transmitted from the second radio unit 4 to the first radio unit 3 (packet transmission 6).

[0038] The first time recording device 1 and the second time recording device 2 are designed as clocks, wherein the second time recording device 2 functions as a reference clock.

[0039] By means of the first time recording device 1, a second information item relating to a reception time of the data packet 5 received by the first radio unit 3 is then determined (reception time determination 7).

[0040] From the first information and the second information, an asynchronicity is determined as a counter difference between the first time recording device 1 and the second time recording device 2 (counter difference determination 8), and from the counter difference, a frequency difference between the first time recording device 1 and the second time recording device 2 is determined (frequency difference determination 9). The frequency difference is determined from a pull characteristic of the first time recording arrangement and characterizes the asynchronicity between the first time recording device 1 and the second time recording device 2.

[0041] On the basis of the frequency difference and thus the asynchronicity as well as the pulling characteristic, an electrical pulling voltage for frequency tuning of a first oscillating element 10 of the first time recording device 1, which is designed as an oscillating quartz crystal, is determined (pulling voltage determination 12).

[0042] For the determination of the drawing voltage 12, the drawing characteristic comprises a functional first relationship between frequency differences between the first time recording device 1 and the second time recording device 2 on the one hand and drawing voltages required to compensate for these frequency differences on the other hand.

[0043] For frequency difference determination 9, the pulling characteristic comprises a functional second relationship between time and frequency differences between the first time recording device 1 and the second time recording device 2.

[0044] The pulling voltage required to compensate for the current frequency difference or the current asynchrony is determined from the pulling characteristic.

[0045] In this exemplary embodiment of a method according to the invention, the drawing voltage is a voltage which is required to impart to the first oscillating element 10 a frequency response which corresponds to that of a second oscillating element 11 of the second time recording device 2.

[0046] To synchronize the first time-recording device 1 with the second time-recording device 2, a first capacitance diode 13, also called a varactor diode, of the first time-recording device 1, connected to the first oscillating element 10, is subjected to the pulling voltage based on the pulling voltage determination 12, thereby influencing the oscillation behavior of the first oscillating element 10 (pulling voltage application 15). The first capacitance diode 13 thus functions as the first tuning element of the first time-recording device 1.

[0047] A capacitance diode is an electronic semiconductor component that can be used to tune the frequency of resonant circuits. By changing the applied voltage, a capacitance variation is achieved. This enables electrical control of the capacitance.

[0048] Due to the tension applied 15, the first oscillating element 10 and the second oscillating element 11 are equal in frequency, thus oscillating synchronously. As a result, the first time-recording device 1 is synchronized with the second time-recording device 2.

[0049] The pull-down voltage is set by means of a first voltage converter 16 of the first time recording device 1, which is designed as a DC-DC converter in the form of an inverting step-up converter. A step-up converter is an electrical circuit by means of which electrical voltages can be increased. In a step-up converter, an inductor is connected in series with a freewheeling diode, behind which a charging capacitor sums up electrical charges, as a result of which the electrical output voltage can be set. This makes it possible to set electrical output voltages. The first voltage converter 16 enables long inactive periods of the first radio unit 3, during which it has a power requirement of less than one microwatt. The pull-down voltage in the first voltage converter 16 does not drop significantly over a period of at least 30 s.

[0050] By means of the drawing voltage, in order to tune the frequency of the first oscillating element 10 with the second oscillating element 11, an oscillating frequency of the first oscillating element 10 is varied by a required absolute amount of up to 200 ppm of a natural frequency of the first oscillating element 10. For example, the oscillating frequency of the first oscillating element 10 can be increased by 90 ppm. Such a variation of the oscillating frequency has the effect that asynchronies due to temperature drift, long-term drift and frequency offsets of the first time recording device 1 can be corrected effectively and with negligible risks with regard to unstable operating behavior of the first time recording device 1.

[0051] Temperature drift is dealt with by monitoring the temperatures of the first time recording device 1 and thus the first radio unit 3 by means of a temperature sensor 18 of the first radio unit 3, as shown by way of example in Fig. 2. If an exceedance of a defined temperature threshold is detected, the time interval in which synchronization processes are carried out is reduced. This allows asynchronies to be avoided or corrected at an early stage. In such a case, a synchronization process is initiated by request data packets being sent from the first radio unit 3 to the second radio unit 4 in a request time interval. The second radio unit 4 is thereby caused to start the packet transmission 6 described above and thus the synchronization process. The described method is carried out cyclically.If an exceedance of the temperature threshold is detected or if the asynchronicity determined as described above increases (temperature asynchronicity test 19), a synchronization interval of the first time recording device 1 is reduced by reducing the request time interval to a defined value (interval adjustment 20).

[0052] According to the invention, it is also conceivable that the second radio unit 4 transmits radio data packets with synchronization information at regular time intervals and the first radio unit 3 receives such radio data packets when synchronization is required.

[0053] Fig. 2 shows a schematic representation of an exemplary first embodiment of a radio device according to the invention. The radio device comprises a first radio unit 3 with a first time recording device 1 and a second radio unit 4 with a second time recording device 2. The first time recording device 1 and the second time recording device 2 form a time recording arrangement and are designed as clocks. According to the invention, it is also conceivable for the radio device to be designed as a radio network and to have more than two radio units and more than two time recording devices.

[0054] For transmitting radio data packets between the first radio unit 3 and the second radio unit 4, the first radio unit 3 has a first antenna 21 and the second radio unit 4 has a second antenna 22.

[0055] By means of the first radio unit 3 and the second radio unit 4, a method for synchronizing the time recording arrangement, as described by way of example in connection with Fig. 1, is carried out. For this purpose, the first time recording device 1 has a first pulling circuit 23, by means of which a first capacitance diode 13, acting as the first tuning element, of the first time recording device 1 is subjected to an electrical pulling voltage. As a result, as described by way of example in connection with Fig. 1, a frequency tuning of a first oscillating element 10 of the first time recording device 1, which is connected to the first capacitance diode 13, with a second oscillating element 11 of the second time recording device 2 is carried out. The first oscillating element 10 and the second oscillating element 11 are designed as quartz oscillators.

[0056] In order to be able to synchronize the second time-detecting device 2 with time information from a satellite 25, the second time-detecting device 2 has a second pulling circuit 24, by means of which a second capacitance diode 14 of the second time-detecting device 2, which is connected to the second oscillating element 11 and functions as a second tuning element, can be subjected to an electrical pulling voltage. This allows the frequency of the second oscillating element 11 to be tuned based on external time information, which is determined from received radio signals transmitted by the satellite 25.

[0057] A first voltage converter 16 of the first time recording device 1 is connected to the first capacitance diode 13 in order to apply a pulling voltage to the first capacitance diode 13, and a second voltage converter 17 of the second time recording device 2 is connected to the second capacitance diode 14 in order to apply a pulling voltage to the second capacitance diode 14.

[0058] The first radio unit 3 is supplied with electricity via a battery 26. The battery 26 is designed as a lithium-ion accumulator with an electrical charge of 1300 mAh and a length of 35 mm, a width of 50 mm, and a thickness of 5 mm. According to the invention, it is also conceivable to design the first radio unit 3 as an energy-harvesting radio unit.

[0059] The second radio unit 4 is supplied with electricity via an on-board power system 27 of a rail vehicle, as shown by way of example in Fig. 3. However, according to the invention, it is also conceivable to design the second radio unit 4 as an energy harvesting radio unit.

[0060] When a synchronization process is performed, a packet transmission 6 is performed, as described by way of example in connection with Fig. 1. A data packet 5 is transmitted from the second radio unit 4 to the first radio unit 3 via the second antenna 22 and the first antenna 21.

[0061] The first time recording device 1 has a first microcontroller 28 connected to the first pull-up circuit 23 via the first voltage converter 16, and the second time recording device 2 has a second microcontroller 29 connected to the second pull-up circuit 24 via the second voltage converter 17.

[0062] The first puller circuit 23 is controlled by the first microcontroller 28, the second puller circuit 24 by the second microcontroller 29.

[0063] In the first microcontroller 28, a pulling characteristic of the time recording arrangement is implemented, as described by way of example in connection with Fig. 1.

[0064] The first radio unit 3 has at least one sensor 30 designed as a vibration sensor, which is connected to the first time-recording device 1 and supplied with electricity via the battery 26 of the first radio unit 3. Measurement results from the sensor 30 are assigned to a time by means of the synchronized first time-recording device 1.

[0065] According to the invention, it is also possible for the sensor 30 itself to form the first time recording device 1 or to comprise it (i.e., to comprise the first oscillating element 10 and the first pull circuit 23, etc.).

[0066] Measurement data packets 31 based on the measurement results of the sensor 30 as well as request data packets described as examples in connection with Fig. 1 for triggering a synchronization process or for changing a synchronization interval are transmitted from the first radio unit 3 to the second radio unit 4 via the first antenna 21 and the second antenna 22.

[0067] Fig. 3 shows a schematic side view of an exemplary embodiment of a rail vehicle according to the invention.

[0068] The rail vehicle has a chassis 32 and a car body 33, wherein the car body 33 is supported on a chassis frame 35 of the chassis 32 via an air secondary spring arrangement 34.

[0069] A first wheelset 37 is coupled to the chassis frame 35 via a first wheelset bearing of the chassis 32 and a first wheelset bearing housing 36 of the chassis 32, not visible in Fig. 3, as well as via a second wheelset bearing of the chassis 32 and a second wheelset bearing housing of the chassis 32, which are not visible in Fig. 3. A second wheelset 38 is connected to the chassis frame 35 in the same way as the first wheelset 37.

[0070] The rail vehicle is arranged to be movable on a track 39 via the first wheel set 37 and the second wheel set 38.

[0071] An exemplary second embodiment of a radio device according to the invention is used in a diagnostic and monitoring device for the running gear and track 39. This exemplary second embodiment corresponds to the exemplary first embodiment of a radio device according to the invention, which is shown in Fig. 2.

[0072] The radio device has a first radio unit 3 and a second radio unit 4. The first radio unit 3 comprises, as described by way of example in connection with Fig. 2, a sensor 30 designed as a vibration sensor and, as also mentioned in connection with Fig. 2, is supplied with electricity via a battery 26. The first radio unit

[0073] 3 further comprises a first time recording device 1, as shown by way of example in Fig. 2.

[0074] The first radio unit 3 is connected to a cover of the first wheelset bearing housing 36.

[0075] The second radio unit 4 is located in the car body 33 and connected to a computing unit 40 of the diagnostic and monitoring system. The second radio unit 4 is supplied with electricity via an on-board power system 27 of the rail vehicle.

[0076] The first radio unit 3 has a first antenna 21, the second radio unit 4 has a second antenna 22. Via the first antenna 21 and the second antenna 22, radio data packets are transmitted between the first radio unit 3 and the second radio unit

[0077] 4, for example, measurement data from the sensor 30 of the first radio unit 3 are transmitted to the second radio unit 4 and to the computing unit 40.

[0078] The measurement data is evaluated in the computing unit 40. This allows vibrations to be detected, which could indicate, for example, damage to the first axle bearing or track 39.

[0079] By means of a first pull circuit 23 and a first oscillating element 10 of the first time recording device 1, the first time recording device 1 is synchronized with respect to time information from the second radio unit 4. For this purpose, a synchronization method is used, as is described by way of example in connection with Fig. 1. As also mentioned in connection with Fig. 1, a packet transmission 6 is carried out from the second radio unit 4 to the first radio unit 3 for synchronization. In this case, a data packet 5, as is shown by way of example in Fig. 2, is transmitted, which data packet includes time information from the second radio unit 4.

[0080] List of names

[0081] 1 First time recording device

[0082] 2 Second time recording device

[0083] 3 First radio unit

[0084] 4 Second radio unit

[0085] 5 data package

[0086] 6 Package transmission

[0087] 7 Reception time determination

[0088] 8 Meter difference determination

[0089] 9 Frequency difference determination

[0090] 10 First oscillating element

[0091] 11 Second oscillating element

[0092] 12 Determination of drawing stress

[0093] 13 First capacitance diode

[0094] 14 Second capacitance diode

[0095] 15 Tensile stress application

[0096] 16 First voltage converter

[0097] 17 Second voltage converter

[0098] 18 Temperature sensor

[0099] 19 Temperature asynchrony test

[0100] 20 Interval adjustment

[0101] 21 First antenna

[0102] 22 Second antenna

[0103] 23 First pull circuit

[0104] 24 Second pull circuit

[0105] 25 satellite

[0106] 26 Battery

[0107] 27 On-board power system

[0108] 28 First microcontroller

[0109] 29 Second microcontroller

[0110] 30 sensors

[0111] 31 measurement data package

[0112] 32 chassis

[0113] 33 car body

[0114] 34 Air secondary spring arrangement

[0115] 35 Chassis frame 36 First axle box housing

[0116] 37 First wheelset

[0117] 38 Second wheelset

[0118] 39 Track 40 Computing unit

Claims

Patent claims 1. Procedure for synchronizing a Time recording arrangement comprising at least a first time recording device (1) and a second time recording device (2), which are connected to one another by radio signals, wherein the first time recording device (1) is assigned to a first radio unit (3) and the second time recording device (2) is assigned to a second radio unit (4), characterized in that at least one data packet (5) with first information regarding a transmission time of the data packet (5) is transmitted from the second radio unit (4) to the first radio unit (3), by means of the first time recording device (1) a second information regarding a reception time of the data packet (5) received by means of the first radio unit (3) is determined, an asynchronicity between the first time recording device (1) and the second time recording device (2) is determined from the first information and the second information,an electrical pulling voltage is determined on the basis of the asynchronicity and a pulling characteristic of the time recording arrangement, and for synchronizing the first time recording device (1) with the second, Time recording device (2) with a first Oscillating element (10) of the first time recording device (1) connected first tuning element of the first Time recording device (1) is subjected to the drawing voltage, whereby an oscillation behavior of the first oscillating element (10) is influenced.

2. Method according to claim 1, characterized in that the drawing voltage is set by means of a first voltage converter (16) of the first time recording device (1).

3. Method according to claim 1 or 2, characterized in that a synchronization interval of the first time recording device (1) is reduced with increasing asynchronicity.

4. Method according to one of claims 1 to 3, characterized in that temperatures of at least the first radio unit (3) are monitored.

5. Method according to one of claims 1 to 4, characterized in that a frequency difference between the first time recording device (1) and the second time recording device (2) is determined from the asynchronicity.

6. Method according to one of claims 1 to 5, characterized in that by means of the drawing voltage an oscillation frequency of the first oscillation element (10) is varied by an absolute amount of up to 200 ppm of a natural frequency of the first oscillation element (10).

7. Radio device which is set up to carry out a method according to one of claims 1 to 6, comprising at least a first radio unit (3) with at least one first time recording device (1) and a second radio unit (4) with at least one second time recording device (2), characterized in that at least the first time recording device (1) has a first pull circuit (23) for applying a first From the tuning element of the first time recording device (1) with an electrical pulling voltage for a first oscillating element (10) of the first time recording device (1).

8. Radio device according to claim 7, characterized in that the second time recording device (2) has a second pull circuit (24) for applying a second From the voice element of the second time recording device (2) with an electrical pulling voltage for a second oscillating element (11) of the second time recording device (2).

9. Radio device according to claim 7 or 8, characterized in that at least the first tuning element is designed as a first capacitance diode (13) which is connected to a first voltage converter (16) of the first time recording device (1).

10. Radio device according to one of claims 7 to 9, characterized in that at least the first time recording device (1) has a first microcontroller (28) which is connected to the first pull circuit (23).

11. Radio device according to one of claims 7 to 10, characterized in that at least the first oscillating element (10) is designed as a quartz oscillator.

12. Radio device according to one of claims 7 to 11, characterized in that at least the first radio unit (3) comprises at least one sensor (30) which is connected to the first time recording device (1) or which has the first time recording device (1).

13. Rail vehicle with at least one radio device according to one of claims 7 to 12.

14. Rail vehicle according to claim 13, characterized in that the at least one radio device is used in a diagnostic and / or monitoring device for at least one running gear (32) of the rail vehicle and / or for a track (39).

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