JPH03264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slip-slip detection device for a train, etc., which is used to control the wheel speed of a train, etc. when the train is running.

[Prior art]

Conventionally, wheel speed control when a train or the like is running has been performed as follows. That is, a wheel slipping/sliding detection device as shown in FIG. 5 is used, and each wheel of each vehicle is braked.

In this figure, speed generators 1 and 2 are AC tachogenerators attached to each of the front and rear axles, and output sine wave signals with frequencies proportional to the rotational speeds of the axles 1 and 2. 3 and 4 are frequency-DC voltage converters (hereinafter referred to as F-DCV) that output DC voltages S ₁ and S ₂ that increase linearly in proportion to the output frequency of each of the speed generators 1 and 2. be. The DC voltages S ₁ and S ₂ outputted by the F-DCVs 3 and 4 are applied to the input terminals of the comparators 5 and 6, respectively.

The comparators 5 and 6 compare and determine the magnitude relationship between the DC voltages S ₁ and S ₂ . When S ₁ > S ₂ , the comparator 5 outputs an "H" level skidding command, and when S ₁ < In the case of _S2 , the comparator 6 outputs an H-level slipping skiing command. The slipping/sliding commands output by the comparators 5 and 6 are supplied to the brake drive circuit as an axle braking command, and are also supplied to the timer 7.

The timer 7 measures the time during which the above-mentioned slipping/sliding command is output, and outputs an abnormal command signal Sa when the slipping/sliding command is output for a preset time (Tsec) or more.

As mentioned above, the slipping/sliding command is supplied to the brake control circuit and acts to restore the wheel speed to its normal state. However, if the wheel speed does not return to its normal state even with the brake control described above, There is. In such a case, as described above, the abnormality command Sa is issued from timer 7, and measures are taken to determine that a serious problem (for example, a stuck axle) has occurred, such as stopping the vehicle and checking the condition of the wheels. Ta.

[Problem that the invention seeks to solve]

In addition to the above-mentioned stuck axle, there are cases in which an abnormality command is issued: (1) The wheel is rotating stably, but there is a speed difference between the wheel speed and the train speed (other wheel speeds); If the condition continues for a certain period of time.

(2) When the speed detector is disconnected.

(3) The control circuit may be damaged.

Ideally, the situation in which an abnormality command is output in a slipping/sliding detection device is limited to a stuck axle, and as described above, (1) when a speed difference occurs, and (2) when the speed detector is In the case of disconnection 3. In the case of damage to the control circuit, it is desirable not to output an abnormality command. Therefore, countermeasures such as double winding the winding can be considered to prevent wire breakage in the speed detector (2), and measures such as installing a backup circuit can be considered to prevent damage to the control circuit (3). Countermeasures can be considered, but all of these pose problems in terms of cost.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a slipping/sliding detection device that can reliably distinguish between cases where the axle is stuck and cases where other abnormalities occur. There is a particular thing.

[Means for solving problems]

Therefore, in the present invention, the speed signal corresponding to the rotational speed of the first axle detected by the first speed detector and the speed signal of the second axle detected by the second speed detector are Compare by means of comparison,
If there is a difference between the two, the first axle or the second
In the spin/skid detection device that outputs a spin/skid command for the axle, the first and second speed detectors are configured such that the output is added in parallel to the outputs of the first and second speed detectors.
an oscillator connected to the speed detector of the first and second speed detectors;
a signal detection means for detecting the presence or absence of a signal at the output end of the speed detector and outputting a detection signal when detecting no signal; and when there is no signal at the output end of any of the speed detectors, The present invention provides means for solving the above problems by providing a time measuring means for outputting an abnormality command when the above-mentioned slipping/sliding command for the corresponding axle is continuously output for a predetermined fixed period of time.

[Effect]

According to the invention, the signals at the outputs of the first and second speed detectors are applied to the respective signal detection means. The signal detecting means detects the presence or absence of a signal at the output terminal of the speed detector, and outputs a detection signal to the time measuring means if the signal is not present.

On the other hand, the signals at the output terminals of the first and second speed detectors are compared by the first comparing means, and if there is a difference between the two, the first comparing means outputs a slipping/sliding command. This skidding command is supplied to the time measuring means, and the time measuring means outputs an abnormality command when the skidding command is continuously output for a certain period of time and the signal detecting means outputs a detection signal. That is, (i) When one of the axles is stuck: Since there is no signal from the output end of the speed detector attached to the stuck axle, the signal detection means outputs a detection signal to the time measurement means. On the other hand, since a signal is generated at the output end of the normal axle speed detector,
The first comparison means continues to output a skidding command corresponding to the stuck axle. As a result, an abnormality command is output from the time measuring means.

(ii) When there is a speed difference between the axles The signal detection means does not output a detection signal, so the time measurement means does not output an abnormality command. On the other hand, the first comparing means compares the speed signals of the axles, and outputs a slipping/sliding command for the corresponding axle according to the speed difference.

(iii) When the speed detector is disconnected Since the output terminal of the disconnected speed detector is supplied with the signal output from the oscillator, the signal detection means does not output a detection signal, and the time measurement means does not issue an abnormal command. No output. The first comparison means compares the speed signal corresponding to the signal at the output terminal of the detector with the speed signal corresponding to the signal at the normal output terminal of the speed detector, and outputs a skidding command according to the difference between the two. Therefore, a broken speed detector can be identified based on the slip-sliding command while the train is stopped.

(iv) When the control circuit is damaged Even if the control circuit (comparison means) is damaged and a skidding command is output, if the signal detection means and time measurement means are normal, an abnormality command will be output by mistake. Never.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram of the same embodiment, and parts corresponding to those in FIG. 5 are given the same reference numerals and their explanations will be omitted. The embodiment shown in this figure differs from the embodiment shown in FIG. 5 in the following points. That is, between the ground level point G and the output ends A, B of each speed generator 1, 2, that is, G-A, G-B
The oscillator 5 is connected in parallel to the speed generator via resistors 3 and 4 between them, and the F-DCV6,
The point is that signal detection circuits B ₁ and B ₂ are inserted in parallel with the comparator 8, F-DCV 7, and comparator 9, respectively. Here, the resistors 3 and 4 have the same resistance value, and are set to a value sufficiently large with respect to the output impedance of the speed generator.

The oscillator 5 outputs a sine wave signal em with a frequency.

The signal detection circuits B ₁ and B ₂ are charging and discharging circuits provided corresponding to the speed generators 1 and 2, respectively, and include a transistor Tr ₁ , resistors R ₃ and R ₄ inserted into the base and collector, and a charging capacitor. It is composed of C ₁ . The signal detection circuit B ₁ detects the signal Va ₁ (second
) is supplied to the base of the transistor Tr ₁ via the resistor R ₃ , and the capacitor is used as a detection signal indicating the presence or absence of the supplied signal Va ₁ .
Outputs the terminal voltage Vb ₁ (see Figure 2) of C ₁ . That is, when there is no signal Va ₁ (S in Fig. 2)
range) Transistor Tr ₁ is off, so the terminal voltage of capacitor C ₁ increases with the time constant of C ₁ and R ₄ . On the other hand, if there is a signal Va ₁ , the transistor Tr ₁ is on, so until then the capacitor C ₁
The charge q that has been charged in the transistor Tr 1 is rapidly discharged with the time constant of C ₁ and Z ₀ via the output impedance Z ₀ of the transistor Tr ₁ . Therefore, the terminal voltage Vb ₁ of the capacitor C ₁ becomes as shown in FIG. Note that the signal detection circuit _B2 is similar to the signal detection circuit _B1 . The timer circuit 10 is supplied with the terminal voltages Vb ₁ and _Vb 2 of the charging capacitor C ₁ in the detection circuits B ₁ and B ₂ and the slip/slide command output from the comparators 8 and 9. In this timer circuit 10, either the comparator 8 or 9 outputs a skidding command for a certain period of time, and the signal detection circuit _B1 or _B2 outputs a detection signal in response to the skidding command. Abnormal command signal under the above conditions.
Output Sa.

Next, the operation of the above embodiment will be explained. The train is running at a certain speed. The speed generators 1 and 2 generate sinusoidal signals Em ₁ and Em ₂ .
On the other hand, the oscillator 5 outputs a signal em.
This signal em is divided by the impedance of the resistor 3 and the speed generator 1, and on the other hand by the impedance of the resistor 4 and the speed generator 2.
Here, the impedance of the speed generator is resistor 3,
Therefore, when the speed generators 1 and 2 are in a normal state, the signal level output from the oscillator 5 on the output terminals A and B of the speed generators 1 and 2 is This level is almost negligible compared to the output of the speed generator. That is, the signals at output terminals A and B are approximately equal to the output signal of the speed generator. And the signals Va ₁ at the output terminals A and B,
Va ₂ is the signal detection circuit B ₁ , B ₂ and F-DVC6,
and so on to F-DVC7.

Hereinafter, the operation of this embodiment will be described for cases in which one of the axles is stuck, a speed difference occurs between the axles, the speed generator is disconnected, and the comparator is damaged.

When one axle is stuck When the axle to which the speed generator 1 is attached is stuck, the signal detection circuit B ₁ outputs a detection signal to the timer circuit 10, while the comparator 8 outputs a skidding command. . When the skidding command continues to be output for a certain period of time, the timer circuit 10 outputs an abnormality command signal Sa.

When a speed difference occurs between the axles: In this case, the signal detection circuit will not output a detection signal, so the abnormality command signal Sa will not be output. On the other hand, the comparator 8 or 9 outputs a slipping/sliding command depending on the magnitude relationship between the DC voltages S ₁ and S ₂ .

When the speed generator is disconnected If the speed generator 1 is disconnected, the generator 1 outputs
Does not generate Fm ₁ . However, the output em of the oscillator 5 appears at the output terminal A. Therefore, the timer circuit 10
The abnormal command signal Sa will not be output. Let the output frequency of the oscillator 5 be the normal speed generator 2.
Let F be the output frequency generated by F. When >F, the comparator 8 outputs a skidding command, and when <F, the comparator 9 outputs a skidding command. The same applies when the speed generator 2 is disconnected.

If the comparator is damaged Even if comparator 8 is damaged, the signal detection circuit
Unless B ₁ , B ₂ and the timer circuit 10 are damaged, the abnormality command signal Sa will not be output. Regarding the idle skidding command, it depends on the state of damage to the comparator.

Next, a second embodiment will be described. FIG. 3 is a block diagram of the same embodiment. In this figure, the same parts as in FIG. 1 are given the same numbers and their explanations are omitted. In this figure, 11 and 12 are second comparing means.

The comparator 11 compares the reference voltage V ₁ ref and the output of the F-DVC 6, and compares the reference voltage V ₁ ref with the output of the F-DVC 6.
When the output of DVC6 is high, a disconnection detection signal of "H" level is output.

Comparator 12 is similar to comparator 11 described above.
In this embodiment, the output frequency of the oscillator 5 is set to a value _f1 that is sufficiently larger than the output frequency of the speed generator when the train runs within a normal speed range.
If the DC voltages output by the F-DVCs 6 and 7 corresponding to frequency ₁ are S ₁₁ and S ₂₁ , the comparator 11 is
Under the condition that V ₁ ref<S ₁₁ , the comparator 12 outputs an “H” level disconnection detection signal corresponding to the disconnection of the speed generator 1, and under the condition that V ₂ ref<S ₂₁ , the comparator 12 outputs the disconnection detection signal of the speed generator 2. Outputs a disconnection detection signal corresponding to the disconnection.

As described above, in this embodiment, it is possible to identify a broken speed generator while the train is running.

Next, a third embodiment will be described with reference to FIG. In the second embodiment described above, when the speed generator is disconnected, a corresponding disconnection detection signal is output. In this embodiment, based on the disconnection detection signal,
This is intended to cancel the correspondingly outputted skidding command. In FIG. 4, the same parts as in FIG. 3 are given the same numbers and their explanations will be omitted. In this figure, the input terminals of the comparators 11 and 12 differ from the case of the second embodiment described above, in that the reference voltage is input to ten terminals, and the signals S ₁₁ and S ₁₂ are input to one terminal. Therefore, the polarities of the outputs of the comparators 11 and 12 are opposite to those in the second embodiment.

Reference numeral 13 denotes a control circuit which prohibits the output of a skidding command based on the output of the comparator 11 when the speed generator 1 is disconnected. In this embodiment, the control circuit is composed of diodes 13a, 13b and a bias resistor 13c. As long as the corresponding speed generator is not disconnected, the comparator 8 outputs a skidding command depending on the situation, and if the generator 1 is disconnected, the "H" level output from the comparator 8 is output by this control circuit. The idle skiing command is forcibly pulled to the ground level by the output of the comparator 11. For this reason, in this embodiment, when the speed generator 1 is disconnected, it is possible to prohibit a skid command caused by the disconnected speed generator 1. Note that the same applies to the slipping skiing command output by the comparator 9.

Above, we have described the case of analog processing using the F-DCV conversion circuit and comparator.
Of course, it is also possible to perform digital processing using a digital counter.

〔effect〕

Since the present invention has the above-described configuration, it is possible to reliably distinguish between stuck axles and other states, and in a situation where axle speed control is required, a slipping/sliding command is output, which causes the axle to become stuck. Furthermore, in the case of a break in the speed generator, the broken speed generator can be reliably identified regardless of whether the train is running or stopped.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment according to the present invention, and FIG. 2 is a transistor diagram of the same embodiment.
A waveform diagram of the signal Va ₁ supplied to the base of Tr ₁ and the terminal voltage Vb ₁ of the capacitor C ₁ , FIG. 3 is a block diagram of the second embodiment, and FIG. 4 is a block diagram of the third embodiment. Figure 5 shows conventional trains, etc.
FIG. 3 is a block configuration diagram of a travel detection device. 1, 2...Speed generator (speed detector), 5...
Oscillator, 8, 9... Comparator, B ₁ , B ₂ ... Charge/discharge circuit (signal detection circuit), 10... Timer circuit (time measuring means), 11, 12... Comparator, 13, 1
4...Control circuit.

Claims (1)

[Claims] 1. A speed signal corresponding to the rotational speed of the first axle detected by the first speed detector and a speed signal of the second axle detected by the second speed detector are In the slip/skid detection device, which outputs a slip/skid command for the first axle or the second axle if there is a difference between the two speed detectors, the output is from the first and second speed detectors. An oscillator connected to the first and second speed detectors so as to be applied in parallel to the output, and the presence or absence of a signal at the output ends of the first and second speed detectors were detected, and no signal was detected. If there is no signal at the output end of either of the speed detectors and the signal detection means that outputs a detection signal when the above-mentioned wheel slipping command for the corresponding axle is continuously output for a predetermined period of time. 1. A slip-slipping detection device for a train, etc., comprising: a time measuring means for outputting an abnormality command when the vehicle is running. 2. Compare the speed signals corresponding to the rotational speeds of the first and second axles with a preset reference voltage, and adjust the speed of the first and second speed detectors based on the respective comparison results. 2. The slip-sliding detection device for a train, etc. as claimed in claim 1, further comprising second comparison means for detecting a wire breakage and outputting a wire breakage detection signal. 3. Idling/sliding of a train, etc. as set forth in claim 2, further comprising a control circuit that prohibits generation of said siding/sliding command when said disconnection detection signal is output from said second comparing means. Detection device.