JPH11313409A - Ats speed collation method and ats speed collation apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the flickering in the display of a train speedometer, when a speed signal is outputted to the train speedometer and assist in the safer train running. SOLUTION: A digit up-shift/digit down-shift determination processing means 17 determines whether the digit of a speedometer output is increased or deceased in digit, accordance with a calculated speed value. When it is determined that the digit is increased, a speed correction processing means 18 outputs the calculated speed value or a corrected speed value, which is obtained by adding a certain value to the calculated speed value to a train speedometer through a speed signal outputting means 16 for the speed change thereafter. When it is determined that the digit is decreased, the speed correction processing means 18 outputs the calculated speed value or a corrected speed value, which is obtained by deducting a certain value from the calculated speed value to the train speedometer through the speed signal outputting means 16 for the speed change thereafter. With this constitution, the flickerings in the display of the train speedometer are avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATS speed checking method which is an on-board equipment in an automatic train stop system (ATS) for safely operating a train, and an ATS speed checking method therefor.

[0002]

2. Description of the Related Art In a conventional ATS speed checking device, a speed signal input means generates a voltage signal corresponding to a speed corresponding to an input from a compensator, and a speed limit signal input means supports a speed limit input. A voltage signal corresponding to the speed is generated, and the two voltage signals are compared to perform a speed check. When the train speed exceeds the speed limit, a brake signal is output.

However, in such a configuration, the speed signal output from the compensator is input to the ATS speed checking device and then converted into a signal suitable for processing in the speed checking by the speed signal input means. There is an error between the speed signal output directly from the compensator to the train speedometer,
Because this error is added to cause a difference between the displayed speed and the check speed, in the running state approaching the speed limit, the speed displayed on the train speedometer is within the speed limit,
The ATS speed checker may determine that the train speed has exceeded the speed limit and output a brake signal.
There is a problem that it is difficult to run close to the speed limit.

In order to solve such a problem, the applicant of the present application disclosed in Japanese Patent Application Laid-Open No. Hei 7-67203 that the train speed was reduced even when the vehicle was running close to the speed limit or running at the same speed as the speed limit. An ATS speed checking device that can suppress the output of the brake signal as long as the speed displayed on the meter does not exceed the speed limit has been proposed.

Hereinafter, this prior invention will be described with reference to the drawings. FIG. 8 shows the configuration of the above-mentioned prior invention. In FIG. 8, reference numeral 71 denotes signal input means for receiving a signal from the speed generator. Numeral 72 denotes wheel diameter setting means, which is set according to the wheel diameter of the train. 73 is a speed limit signal input means for receiving a speed limit signal, 74 is a processing means for calculating speed and checking speed, 75 is a brake signal output means for outputting a brake signal, and 76 is a speed signal output means for outputting a train speed signal. is there.

Next, the operation of the above-mentioned prior invention will be described. In FIG. 8, a signal input unit 71 receives a signal from the speed generator, shapes the waveform, generates a speed pulse signal, and inputs the generated signal to a processing unit 74. The wheel diameter setting means 72 receives a signal set according to the wheel diameter of the train and inputs the signal to the processing means 74. The processing means 74 receives these signals, performs speed calculation and speed checking, outputs a brake signal through the brake signal output means 75, and outputs a speed signal through the speed signal output means 76.

The processing means 74 calculates the interval time T of the speed pulse signal from the signal input means 71 by an internal high-speed clock, and based on the wheel diameter D from the wheel diameter setting means 72, calculates the train speed as follows. Calculate V.

First, when counting between two speed pulses is performed using a high-speed clock signal of 100 KHz, and the count number is N, the interval time T (s = second) can be obtained by the following equation. T (s) = 0.00001 × N (1) The speed pulse is a constant number P while the train wheel makes one revolution.
Since the number L is generated, the distance L advanced to the time T is obtained by the following equation. L (m) = D (m) × π ÷ P (2) The train speed V is obtained from T and L by the following equation. V (m) = L (m) ÷ T (s) (3) From equation (3), the train speed V (Km / h) is obtained by the following equation. V (Km / h) = 3.6 × L (m) ÷ T (s) (4)

The processing means 74 outputs the value of the speed V calculated by the equation (4) to the speed signal output means 76. The processing means 74 also calculates the speed V corresponding to the speed V calculated by the equation (4) and the speed VS corresponding to the speed limit signal from the speed limit signal input means 73.
When V> VS, a brake signal is output to the brake signal output means 75. Upon receiving the results of these processes, the brake signal output means 75 outputs a brake signal to the brake device, and the speed signal output means 76 outputs a train speed signal to the train speedometer.

FIG. 9 shows the processing of the speed signal output means 76 at this time. When the speed data is received from the processing means 74 (step S81), the speed data is output to the train speedometer as it is (step S82).

[0011]

However, in the above-mentioned prior art, the train is caused to be displaced from the center between the rotating shaft of the speed generator and the axle of the train even though the train is running at a constant speed during coasting operation. There is a problem that the speed display of the train digital speedometer flickers due to fluctuations in the speed calculation value caused by frequency fluctuations of the speed generator. FIG. 10 shows an example of a speed output during a constant speed operation during the coasting operation of the conventional example. As shown in FIG. 10, the speed output signal has an integer of three digits after rounding up the decimal point. Even a slight change in the value after the decimal point results in 100 → 99 → 100 →
Since the speed output of 99 is repeated in a cycle of 1 second or less, the speed display of the digital speedometer flickers. The train driver often coasts while driving, and watches the speedometer at that time, so he continues to see this unnecessary display flickering.

The present invention solves such a problem of the prior invention. When a speed signal is output to a train speedometer, a speed calculation value resulting from a frequency fluctuation of a speed generator, etc., is displayed after the decimal point. An object of the present invention is to provide an excellent ATS speed checking method and apparatus capable of eliminating flickering of a train speedometer display caused by a slight fluctuation.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a means for determining whether a carry / carry in a speedometer output is being carried out and a carry / carry / under carry determination. Means for correcting the content of the speed signal output according to the speed change amount, and when outputting the speed signal to the train speedometer, if the carry determination is being performed, the speed corresponding to the subsequent speed change, A corrected value obtained by adding a fixed value to the calculated value or the calculated speed value is output to the train speedometer.If a carry-down is being determined, a constant value is calculated from the calculated speed value or the calculated speed value in response to a subsequent speed change. The subtracted correction value is output to the train speedometer, eliminating flickering of the train speedometer display,
It can contribute to safer driving.

The present invention, in addition to the above configuration, further comprises means for determining whether the speed is equal to or higher than the speed limit. When the speed is lower than the speed limit, the speed signal output content is corrected. When the speed is higher than the speed limit, the speed signal output is not corrected and the speed is output to the train speedometer. By outputting a speed signal corresponding to the signal, it is possible to contribute to safer traveling.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is to output a speed calculation value obtained by calculation from a signal from a speed generator and a wheel diameter to a train speedometer by rounding up or down the decimal point. When displaying, when the carry is carried out, a speed calculation value corresponding to the subsequent speed change or a correction value obtained by adding a fixed value to the speed calculation value is output to the train speedometer,
An ATS speed checking method characterized by outputting a speed calculation value or a correction value obtained by subtracting a constant value from the speed calculation value to a train speedometer in response to a subsequent speed change when a digit is decremented. This has the effect of eliminating flickering on the speedometer display and contributing to safer traveling.

According to a second aspect of the present invention, it is determined whether the speed is equal to or higher than the speed limit, and the speed signal output content is corrected only when the speed is lower than the speed limit, The ATS speed checking method according to claim 1, wherein the speed signal is output to the train speedometer without correcting the speed signal output content according to claim 1, when the speed is equal to or higher than the speed limit. Eliminate flicker on the train speedometer display,
The speed signal corresponding to the brake signal is output, which has the effect of contributing to safer traveling.

According to a third aspect of the present invention, there is provided a signal input means for receiving a signal from a speed generator, a wheel diameter setting means for setting and inputting a wheel diameter, and a speed limit signal for receiving a speed limit signal. Input means, processing means for performing speed calculation and speed check, carry / under position determination processing means for determining whether carry / carry of speedometer output is in progress, and carry / under carry determination Speed correction processing means for correcting the content of the speed signal output based on the amount of speed change thereafter; brake signal output means for outputting a brake signal to the brake device; and speed signal output means for outputting a speed signal to the train speedometer. When outputting a speed signal to the train speedometer, if the carry is being determined, the train speed meter calculates a speed calculation value or a correction value obtained by adding a fixed value to the speed calculation value in response to a subsequent speed change. And carry down In the case of Teichu is, A, characterized in that outputs a correction value obtained by subtracting a predetermined value from the velocity calculated value or velocity calculated value corresponding to the subsequent speed change to the train speedometer
This is a TS speed checking device, which has the effect of eliminating flickering on a train speedometer display and contributing to safer traveling.

According to a fourth aspect of the present invention, there is provided a speed determination processing means for determining whether or not the speed is equal to or higher than the speed limit, and the speed signal according to the third aspect is provided only when the speed is lower than the speed limit. The output signal is corrected, and if the speed is equal to or higher than the speed limit, the speed signal is output to the train speedometer without correcting the speed signal output content according to claim 3. The ATS speed check device has an effect of eliminating flickering of a train speedometer display, outputting a speed signal corresponding to a brake signal, and contributing to safer traveling.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of an ATS speed checking device according to a first embodiment of the present invention. In FIG. 1, 11 is a signal input means for receiving a signal from the speed generator, 12 is a wheel diameter setting means, 13 is a speed limit signal input means, 14 is a processing means for performing speed calculation and speed check, and 15 is a brake. A signal output means, 16 is a speed signal output means, 17 is a carry / under-sign determination processing means, and 18 is a speed correction processing means.

Next, the operation of the first embodiment will be described. In FIG. 1, a signal input unit 11 receives a signal from a speed generator, shapes the waveform, generates a speed pulse signal, and inputs it to a processing unit 14. The wheel diameter setting means 12 receives a signal set according to the wheel diameter of the train and inputs the signal to the processing means 14. Speed limit signal input means 13
Receives the speed limit signal and inputs it to the processing means 14. The processing means 14 receives these signals, performs speed calculation and speed check, and outputs the calculated value of the train speed V to the carry / under-sign determination processing means 17 and the speed correction processing means 18. A speed signal VS corresponding to the speed limit signal is compared, a brake signal is output when V> VS, and a brake signal is output to the brake device through the brake signal output means 15.

The upper / lower digit determination processing means 17 determines whether any carry-up or digit-down of the speedometer output has occurred based on the calculated speed value. The speed correction processing means 18 outputs a calculated speed or a correction value obtained by adding a fixed value to the calculated speed to the train speedometer in response to the subsequent speed change, when the carry determination is being performed, and performs the carry determination. In this case, the calculated speed or a correction value obtained by subtracting a constant value from the calculated speed is output to the train speedometer in response to the subsequent speed change, and the speed signal is output to the train speedometer through the speed signal output unit 16.

Next, processing for outputting a train speed signal will be described with reference to FIG. Upon receiving the speed calculation value data from the processing unit 14, the digit upper / lower digit determination processing unit 17 compares the previous data with the current data (Step S).
21) It is determined whether or not the speed output signal in which the decimal part is rounded up to an integer of 3 digits has a carry (step S22) or a carry has occurred (step S23). And the speed "ab"
c. d ”, the value of Vu =“ abc.1 ”is stored (step S24).
And the speed "efg.h" at the time of carry down, V
d = “efg.0” is stored (step S2).
5). The speed correction processing means 18 receives the speed calculation value data from the processing means 14, receives the storage result during carry or under carry and the value of Vu or Vd from the carry / undersend determination processing means 17, and carries out carry determination. In the middle case (step S26), the calculated speed values V and Vu are compared (step S2).
7) When V becomes Vu or less, V is set to a fixed value of 0.
The corrected value obtained by adding 5 is used as the speed value for the train speedometer (step S29). When the carry-down is being determined (step S30), the calculated speed value V is compared with Vd (step S31). If Vd is equal to or higher than Vd, a correction value obtained by subtracting a constant value 0.5 from V is set as a speed value for the train speedometer (step S32). If V is smaller than Vd, V is set as the speed for the train speedometer. The value is output to the speed signal output unit 16 (step S33).

Here, the constant value for correcting the speed needs to be larger than the fluctuation value of the calculated speed value caused by the fluctuation of the frequency of the speed generator or the like. / H), during coasting operation of the train, ± 0.5 (Km / h) of the calculated speed value
It is possible to eliminate flickering of the train speedometer display caused by fluctuations less than and to output speed calculation value data to the train speedometer when the speed changes during acceleration / deceleration operation, so that it can accurately respond to the speed change.

FIG. 3 shows an example of these operation timings.
As shown in FIG. 3, the fluctuation value of the speed calculation value caused by the frequency fluctuation of the speed generator is a constant value (± 0.5 Km /
h), if carry determination is being performed, a speed calculation value or a correction value obtained by adding a fixed value to the speed calculation value is output to the train speedometer in response to a subsequent speed change, and the carry reduction determination is performed. In the middle case, a speed calculation value or a correction value obtained by subtracting a constant value from the speed calculation value is output to the train speedometer in response to a subsequent speed change to eliminate flickering on the train speedometer display.
When there is a speed change of a fixed value (± 0.5 km / h) or more, the speed calculation value data is output to the train speedometer immediately to respond to the speed change. When the train shifts from the coasting operation to the acceleration / deceleration operation, the speed calculation value data is output to the train speedometer to accurately correspond to the speed change.

As described above, according to the first embodiment,
A signal input means 11 for receiving a signal from the speed generator, a wheel diameter setting means 12, a speed limit signal input means 13, and a processing means 14 perform speed calculation and speed checking, and carry over / under carry determination processing means. 17 to determine whether any carry-up or carry-down of the speedometer output has occurred on the basis of the calculated speed value. Outputs the calculated speed or a correction value obtained by adding a fixed value to the calculated speed to the train speedometer, and if the carry-down is being determined, the calculated speed or the calculated speed is fixed in accordance with the subsequent speed change. The corrected value obtained by subtracting the value is output to the train speedometer, and the speed signal is output to the train speedometer through the speed signal output means 16 so that the value after the decimal point of the speed calculation value caused by the frequency fluctuation of the speed generator, etc. It has the advantage that it is possible to eliminate the flickering of the train speedometer display due to slight variations.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing the configuration of the ATS speed checking device according to the second embodiment of the present invention. In the second embodiment, in addition to the configuration of the first embodiment shown in FIG. 1, a speed determination processing unit that determines whether the speed is equal to or higher than the speed limit is provided. 4, reference numeral 41 denotes signal input means for receiving a signal from the speed generator, 42 denotes wheel diameter setting means, 43 denotes a speed limit signal input means, 44 denotes processing means for performing speed calculation and speed check, and 45 denotes a brake. A signal output means, 46 is a speed signal output means, 47 is a carry / underscore determination processing means, and 48 is a speed correction processing means, which are the same as those in the first embodiment. 49 is a speed judgment processing means.

Next, the operation of the second embodiment will be described. In FIG. 4, a signal input unit 41 receives a signal from the speed generator, shapes the waveform, generates a speed pulse signal, and inputs the generated signal to a processing unit 44. The wheel diameter setting means 42 receives a signal set according to the wheel diameter of the train and inputs the signal to the processing means 44. Speed limit signal input means 43
Receives the speed limit signal and inputs it to the processing means 44. The processing unit 44 receives these signals, performs speed calculation and speed check, and outputs speed calculation value data to the carry / under-digit determination processing unit 17 and the speed correction processing unit 18.
The speed calculation value data and the speed limit value are output to the speed determination processing means 49, and the brake signal is output to the brake signal output means 4.
5 to output a brake signal to the brake device. The speed determination processing unit 49 determines whether the speed is equal to or higher than the speed limit.

The upper / lower digit determination processing means 47 determines, based on the calculated speed value, whether any of carry-up or carry-down of the speedometer output has occurred. The speed correction processing means 48 sets the calculated speed or a correction value obtained by adding a fixed value to the calculated speed as a speed signal in accordance with the subsequent speed change, only during the determination that the speed is less than the speed limit, and when the carry is determined. Output to the train speedometer, if the carry-down determination is in progress, the calculated speed or a correction value obtained by subtracting a constant value from the calculated speed is output to the train speedometer as a speed signal in response to the subsequent speed change, and the speed limit During the above determination, the calculated speed value is output as a speed signal, and the speed signal is output to the train speedometer through the speed signal output means 46.

Next, processing for outputting a train speed signal will be described with reference to FIGS. Upon receiving the speed calculation value data and the speed limit value from the processing unit 4, the speed determination processing unit 49 compares the calculated speed value with the speed limit value (step S51), and determines whether the speed is equal to or higher than the speed limit. It is stored (steps S52 and S53). Upon receiving the speed calculation value data from the processing means 44, the upper / lower digit determination processing means 47 compares the previous data with the current data (step S54), and rounds up the decimal part to output a speed output signal of three integers. Is a carry occurring (step S
55) or whether a carry has occurred (step S56). At the time of carry determination, Vu = “abc.d” based on “carrying” and the speed at the time of carry occurrence “abc.d”.
1 is stored (step S57), and at the time of carry-down determination, "under carry" and the speed at the time of carry-over "efg.
h ”, the value of Vd =“ efg.0 ”is stored (step S58).

As shown in FIG. 6, the speed correction processing means 48
Receives speed calculation value data from the processing means 44, receives a determination result as to whether or not the speed is equal to or greater than the speed limit from the speed determination processing means 49, In response to the stored result and the value of Vu or Vd, it is not under determination that the speed is less than the speed limit (step S5).
9) Unconditionally, the speed calculation value V is output to the speed signal output means 46 as a speed value for the train speedometer (step S67) (step S67). If the speed is less than the speed limit (step S59), if the carry is being determined (step S60), the speed calculation value V is compared with Vu, and V becomes V
If it is less than u (step S62), a correction value obtained by adding a constant value 0.5 to V is set as a speed value for the train speedometer (step S64), and if V is larger than Vu (step S62). , V are the speed values for the train speedometer (step S65), and when the carry-down is being determined (step S61), the calculated speed value V is compared with Vd, and V
Is greater than or equal to Vd (step S63), a correction value obtained by subtracting a constant value 0.5 from V is set as a speed value for the train speedometer (step S66). If V is smaller than Vd, V is set to The speed value is output to the speed signal output means 46 as a speed value for the train speedometer (step S65) (step S67).

Here, as in the first embodiment, the constant value for correcting the speed needs to be larger than the fluctuation value of the speed calculation value caused by the frequency fluctuation of the speed generator. By setting this value to 0.5 (Km / h), during the coasting operation of the train, the flicker of the train speedometer display caused by the fluctuation of the calculated speed value less than ± 0.5 (Km / h) is eliminated. At the time of speed change during acceleration / deceleration operation, speed calculation value data can be output to the train speedometer to accurately respond to the speed change. Further, by determining whether the speed is equal to or higher than the speed limit by the speed determination processing means 49 and performing processing for determining whether or not to perform speed correction based on the result, a speed signal corresponding to the brake signal can be output. .

FIG. 7 shows an example of these operation timings.
As shown in FIG. 7, the fluctuation value of the speed calculation value caused by the frequency fluctuation of the speed generator is a constant value (± 0.5 Km /
h), if carry determination is being performed, a speed calculation value or a correction value obtained by adding a fixed value to the speed calculation value is output to the train speedometer in response to a subsequent speed change, and the carry reduction determination is performed. In the middle case, a speed calculation value or a correction value obtained by subtracting a constant value from the speed calculation value is output to the train speedometer in response to a subsequent speed change to eliminate flickering on the train speedometer display.
When there is a speed change of a fixed value (± 0.5 km / h) or more, the speed calculation value data is output to the train speedometer immediately to respond to the speed change. When the train shifts from the coasting operation to the acceleration / deceleration operation, the speed calculation value data is output to the train speedometer to accurately correspond to the speed change.

As described above, according to the second embodiment,
Speed calculation and speed checking are performed by a signal input means 41 for receiving a signal from the speed generator, a wheel diameter setting means 42, a speed limit signal input means 43, and a processing means 44. Is determined to be equal to or higher than the speed limit.
A determination is made as to whether any carry-up or carry-down of the speedometer output has occurred based on the calculated speed value, and the speed correction processing means 48 performs the carry determination only during the determination below the speed limit. Outputs a calculated speed or a correction value obtained by adding a fixed value to the calculated speed to the train speedometer in response to a subsequent speed change. A correction value obtained by subtracting a fixed value from the speed or the calculated speed is output to the train speedometer. During the determination that the speed is higher than the speed limit, the calculated speed value is output as a speed signal. Output to the train speedometer eliminates flickering of the train speedometer display due to slight fluctuations in the fractional value of the calculated speed caused by frequency fluctuations of the speed generator, etc. It has the advantage that it is possible to output a.

[0034]

As is apparent from the above description, the present invention provides means for determining whether or not a carry / carry of a speedometer output is being carried out, and a speed change amount after carrying / carry / under carry determination. Means for correcting the output contents of the speed signal by the speed signal output to the train speedometer. A corrected value obtained by adding a fixed value to the calculated value is output to the train speedometer. If a carry-down is being determined, a corrected value obtained by subtracting a fixed value from the calculated speed value or the calculated speed value in response to a subsequent change in speed. Is output to the train speedometer,
Eliminating flickering of the train speedometer display can contribute to safer traveling.

In addition to the above structure, the present invention further comprises means for determining whether the speed is equal to or higher than the speed limit. When the speed is lower than the speed limit, the above-described correction of the speed signal output content is performed. When the speed is higher than the speed limit, the speed signal is output to the train speedometer without performing the above-mentioned correction of the speed signal output contents. Is output, thereby contributing to safer traveling.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an ATS speed checking device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a train speed signal output process according to the first embodiment.

FIG. 3 is an operation timing chart of a train speed signal output process according to the first embodiment.

FIG. 4 is a block diagram illustrating a configuration of an ATS speed checking device according to a second embodiment of the present invention.

FIG. 5 is a flowchart of a train speed signal output process according to the second embodiment.

FIG. 6 is a flowchart of a train speed signal output process according to the second embodiment (continued).

FIG. 7 is an operation timing chart of a train speed signal output process according to the second embodiment.

FIG. 8 is a block diagram showing a configuration of an ATS speed checking device in a conventional example.

FIG. 9 is a flowchart of a train speed signal output process in a conventional example.

FIG. 10 is an operation timing chart of a train speed signal output process in a conventional example.

[Explanation of symbols]

 11, 41, 71 Signal input means 12, 42, 72 Wheel diameter setting means 13, 43, 73 Speed limit signal input means 14, 44, 74 Processing means 15, 45, 75 Brake signal output means 16, 46, 76 Speed signal Output means 17, 47 Upper / lower digit determination processing means 18, 48 Speed correction processing means 49 Speed determination processing means

Claims (4)

[Claims] When a speed calculation value obtained by calculation from a signal from a speed generator and a wheel diameter is rounded up or down and output to a train speedometer for display, when a carry is carried out, The speed calculation value corresponding to the speed change or a correction value obtained by adding a fixed value to the speed calculation value is output to the train speedometer, and if the digit is decremented, the speed calculation value or speed calculation corresponding to the subsequent speed change An ATS speed checking method characterized by outputting a correction value obtained by subtracting a constant value from a value to a train speedometer. Determining whether the speed is equal to or higher than a speed limit;
Only when the speed is less than the speed limit, the speed signal output content according to claim 1 is corrected, and when the speed is higher than the speed limit, the speed signal output content according to claim 1 is not corrected,
2. The ATS speed checking method according to claim 1, wherein the speed signal is output to a train speedometer. 3. A signal input means for receiving a signal from a speed generator, a wheel diameter setting means for setting and inputting a wheel diameter, a speed limit signal input means for receiving a speed limit signal, and speed calculation and speed checking. Processing means for performing, carry-over / under-sign determination processing means for determining whether carry / carry-down of the speedometer output is in progress, and speed signal output content based on a speed change amount after carry-under / carry-under determination. Speed correction processing means for correcting the speed, a brake signal output means for outputting a brake signal to the brake device, and a speed signal output means for outputting a speed signal to the train speedometer, and outputs a speed signal to the train speedometer When the carry is being judged, the speed calculation value corresponding to the subsequent speed change or a correction value obtained by adding a fixed value to the speed calculation value is output to the train speedometer, and the carry down judgment is being performed. The speed change after An ATS speed checking device characterized by outputting a calculated speed value or a correction value obtained by subtracting a fixed value from the calculated speed value to a train speedometer in correspondence with the above. 4. A speed signal processing device according to claim 3, further comprising speed determination processing means for determining whether the speed is equal to or higher than the speed limit, and correcting the speed signal output contents according to claim 3 only when the speed is lower than the speed limit. The ATS speed checking device according to claim 3, wherein the speed signal is output to the train speedometer without correcting the output content of the speed signal according to claim 3 when the speed is higher than the speed.