JPS58153171A - Speed detector - Google Patents

Abstract

PURPOSE:To enable an accurate detection of a running speed while idling and coasting of a vehicle by calculating the running speed based on the level of accelerating or decelerating the vehicle when the variation factor of the axial velocity detected exceeds the reference value. CONSTITUTION:A train is braked by a braking command signal B at the time t1 and voltages Vi and Vo lower in the same inclination. At the time t2, as a vehicle performs, coasting, the voltage Vi lowers sharply and the variation factor thereof exceeds the reference value. Signals S1 and S2 go to a H level after the time t'2 and relay Ra is excited to allow an integration circuit A to start the integration of a voltage VB corresponding to the braking level. Therefore, with an appropriate selection of time constants R3 and C, the voltage Vo can correspond to the velocity obtained from the value subtracting a deceleration speed from the running speed at the time t'2, namely, the current running speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed detection device for detecting a running speed inside a vehicle.

Generally, a speed generator that outputs a voltage proportional to the number of rotations of the wheel is attached to a single-row wheel, and a pulse train generator or the like that outputs a pulse train corresponding to the number of rotations of the axle is attached to the double wheel. . Conventionally, this voltage was used to detect the running speed of the 11 machines based on the pulse generator.

By the way, if there is no one slip between the wheel and the rail, the speed obtained from a single rotation speed (hereinafter referred to as shaft speed)
As is well known, in a moving train, the wheels may spin or slide, and in this case, the shaft speed and the running speed do not match.

Therefore, since the conventional speed detection method that uses the running speed as the running speed cannot obtain the correct running speed when slipping or skidding occurs, devices that control the train based on the running speed, such as ATOM An arrest occurred during the period when the Ill did not work properly.

In view of the above-mentioned circumstances, the present invention provides a speed detection device capable of accurately detecting the running speed even when the vehicle is idling or in a state of suspension. When the reference value is exceeded, the traveling speed is calculated based on the amount of acceleration/deceleration inside the vehicle.

Embodiments of the present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. Note that in this embodiment, the present invention is implemented using a resistor R2t-.
is supplied to the inverting input terminal of comparator wk2. on the other hand,
The resistors R1 to R1, the capacitor 0, and the operational amplifier 3 constitute a two-person circuit, and the output voltage yo of this integrating circuit is supplied to the output terminal 5KgtI, and the non-inverting voltage of the comparator 2 It is supplied to the input terminal via a resistor R. R1-1 and 1a-2 are connected by the normally closed contacts and normally closed contacts of the valley relay R1. As you can see from the cause, relay R
If a is in the de-energized state 11c, the output voltage of the ratio lI2 device 2 is integrated by the time constant R4・C, and if the relay la is in the energized state, the voltage ym supplied to the input terminal 4 is integrated by the time constant R3・C. be done. This voltage v1 is a voltage proportional to the amount of braking of the train (eg, brake driving pressure 1[)]. Further, the above-mentioned time constant R1·C is set to be sufficiently small with respect to the liquefaction rate of the voltage vi. On the other hand, 6 is a liquefaction rate detection circuit, and when the voltage v1 changes in the decreasing direction and the liquefaction rate exceeds a predetermined reference value u, its output signal S is 1 level (detection signal) K It is configured so that 7 is a timer circuit that becomes “L” when the ToO1 signal is 8m or @L” level.
Output a signal of level 8. is at “H” level 1
Outputs a signal of H” level, and also outputs a signal of 1i s t or 1
When the level changes from H” level to @L” level, for a predetermined period of time (
This is a circuit that outputs a ``H'' level for only one hour of the timer. Here, to explain the reference value that has been missed by ^11, in normal train operation, deceleration of more than 5 m per second (i.e., 5-/h/s) is not performed, so if the liquefaction rate of voltage vL is, for example, 5 This reference value is set so that the signal 81 becomes one level when deceleration of @/h/s or more is indicated.

Next, the operation of this embodiment with the above-mentioned configuration is shown in FIG.
#Jl is explained with reference to the second Et.

When the train is running at a constant rate, the rate of decrease in voltage v1 is t
p. As a result, the liquefaction rate detection circuit 60 output signal is "L"
'' level. This causes relay la to be in the de-energized state I
METo, the output signal of comparator 2 is integrated by an integrating circuit. In this case, since the voltage yo is fed back to the comparator 2, the voltage yi is approximately equal to the voltage yo, and since the time constant R4.0 or /j.
o follows changes in voltage yi extremely quickly.

Then, when the brake command signal B is generated in the time pattern shown in Figure 2 (Hata), the brakes are applied to the train (f).
flL, 4 & 11/h/@braking 1k), same figure (b
As shown in lK, the voltages vt and vo fall at the same #lI rate. Then, for example, at time t, when the wheels slip, the -speed drops rapidly, and the voltage 'Vl drops sharply. Voltage yt after this time 1
The degree of fall of the voltage v1, that is, the change in the decreasing direction of the voltage v1 exceeds the double line reference value, and as a result, the signal 8. After being delayed by the operating time of the crab conversion rate detection circuit 6, the time <1. Thereafter, it becomes @H''' level. As a result, the output signal of timer circuit 7 becomes IIc@H# level as shown in Figure 2 (dl), and relay R& is energized. Relay R& is energized. Then, the normally closed contact 1'1a-1 closes and the normally closed contact 1ta-2 opens.

As a result, the integrating circuit starts integrating the voltage v1 corresponding to the brake voltage from time t'. Therefore, if the time constant R3·O is appropriately selected, the voltage yo becomes the voltage corresponding to the traveling speed obtained by subtracting the deceleration from the traveling speed in the time type /, that is, the traveling speed.

Then, at time t, the speed starts to increase, and at time t
, the sliding of the wheels ends. Voltage 7 at time 1s
1 starts to rise, the signal becomes 8I or 1L" level, but the output signal S of the timer circuit 7 is at the ``H'' level at time 1.1 as shown in Figure 2 (dlK), so relay 1' ja continues to be energized at time t, 1. In this way, relay Ra is energized at time t, 1 at the 11th time.
This is to improve the followability of the voltage yo to the voltage vi when the normally closed contacts 1ta-2 shown in 1A are closed. Then, when relay R1 becomes de-energized at time t, the 5-opening point Re-1 or ii&, the normally closed contact R&
-2 or close. As a result, the voltage yo becomes VO'4
” V L.

It should be noted that the voltage conversion rate detection circuit 6 in this embodiment is
t or a sudden rise (Fig. 182 (time t of bl, ~t.

The configuration may be such that a 4"H" level signal is output when the 4"H" level signal is performed. By doing this, the open signal 8. at the 21st m (time sound ', ~t) at which skidding occurs as shown by the CIK dashed line becomes "H" level, so the timer time of the timer circuit 7 is set short. This makes it possible to more accurately detect the speed when the contact of relay R1 is closed.

Before applying this embodiment to detecting the running speed when the wheels are spinning during acceleration, change rate detection (2) wI6 is set to a signal of @H" level when the voltage 71 indicates an appropriate rate of increase. Also, instead of the voltage ym, U
A voltage corresponding to the force driving the car (for example, a voltage corresponding to the armature electric body of the electric motor driving the train) may be supplied to the input terminal 4.

Alternatively, the operation of this embodiment may be performed using a microcomputer. Also, if this embodiment is applied to a skid detector and an ATO, the following advantages can be obtained. .

(1) When applied to a skid detector As is well known, a skid detector detects wheel skidding when a train is braking, loosens the brakes, and returns the train to a sticky MK state. An example of this skid detector is shown in FIG. The voltages vi, ˜Vi, shown in this section are voltages corresponding to the axle speeds obtained from each axle (usually -F14-) of the Yan-Gang train. - As can be seen from
).

15 is a bias circuit which subtracts the reference voltage V from the voltage 7 mai and supplies it to the non-inverting input terminal of the ratio 4I2 device 10-13. The reference voltage V is empirically lO~1
The voltage is set to be equivalent to 5b/hK. When any wheel skids, the voltage 71. ~71. JK for either vs*x? I K /J- becomes low, and one of the comparators 10 to 13 outputs a ``H'' level (brake release signal).

However, if all the wheels skid at the same time, 7m will also become J-lower, resulting in a situation where the wheel issuing the brake release command becomes stuck.

Therefore, it is connected to the 112 input terminals shown in Figure #A1, and the output terminal 5 is connected to point Q via a diode (in the forward direction with respect to the voltage vO).

In this way, even if all the wheels skid, the voltage vO supplied to point Q or the voltage corresponding to the running speed is maintained, so the ratios @10 to 13 output @H” level signals. , so the wheels will not be stuck.

(2) If applied to whip 0 and whip 9, then the whip TO is the speed [#IiI order signal or the speed v lower than the clustering speed wrinkle]
When commanding l, brakes are applied to the train, and the running speed! When It or V becomes lower, the brake is loosened. In this case, if the wheels skid, the running speed or the commanded speed V, or at least the shaft speed, will change, so if the running speed drops, -IrIJ stutters and the brakes are loosened.

Therefore, if the running speed is detected based on the voltage yo shown in FIG. 1, the above-mentioned problem can be solved.

As explained above, according to the present invention, the rate of change in speed is detected, and when the rate of change exceeds the reference value, the traveling speed is calculated based on the lid that accelerates or decelerates inside the vehicle. , accurate travel speed can be detected even if the vehicle is running on a single wheel, idling, or skidding.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
Figure 2 (hot) is a diagram showing the timing of brake signal B;
@2 Diagram axis) to (d+ are waveform diagrams showing the waveforms of the circuit pipe section shown in FIG. 1, respectively, and FIG. 3 is a block diagram showing an example of the configuration of the skid detector. b... Rate of change detection Circuit (lacrimation rate detection section), A... Integral circuit (speed calculation section).

Claims (1)

[Claims] an axle speed detector that outputs a signal corresponding to the rotational speed of the axle; and a rate of change that detects the rate of change in the output signal of the speed detector and outputs a detection signal when the rate of change specified in 1 exceeds a reference value. A speed detection device comprising: a detection section; and a speed calculation section that calculates a traveling speed based on the amount of acceleration/deceleration inside the vehicle when the detection signal is output.