JPH0575353B2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a speed signal generating device for a vehicle.

In particular, the present invention relates to a speed signal generator suitable for vehicles without wheels, such as magnetically levitated vehicles.

``Prior Art'' Conventionally, for vehicles with wheels, a tachometer generator (hereinafter referred to as TG) was used as a signal generator to indicate the running speed of the vehicle. It was common to connect directly to the shaft.

When using the TG, a disconnection detection transmitter is interposed in the middle of the primary signal circuit as shown in FIG. 7 as a means for determining when the vehicle is stopped and when there is a failure.

``Problems to be Solved by the Invention'' However, in such conventional technology, even if the TG is used as a signal generator for the vehicle running speed and the disconnection detection transmitter is interposed, it is difficult to determine whether the TG itself is disconnected. , it is not possible to determine whether the wiring after the TG is faulty.

Another problem is that it cannot be applied to vehicles that do not have wheels, such as magnetically levitated vehicles.

The present invention has been made by focusing on these conventional problems, and can be applied to vehicles that run far from the ground and do not have wheels. A speed signal generator for a vehicle that does not require a circuit, can determine failures after the signal generator, can determine the failure state at the time of failure, can obtain two output information, and can be compared and verified. is intended to provide.

``Means for Solving the Problems'' The gist of the present invention to achieve the above object is to provide slits having a predetermined width, and slits connected at a predetermined pitch to a reflecting wall between each slit. A plate is provided on the ground along the traveling direction of the vehicle, and a continuous light emitting means is disposed on one side with the slit plate in between, while the continuous light emitted from the continuous light emitting means is disposed on the other side. a first light-receiving means is fixed to the body of the vehicle, and an intermittent light-emitting means is provided at a position symmetrical to the continuous light-emitting means with the slit plate in between; A second light receiving means for receiving intermittent light emitted from the intermittent light emitting means is provided on the opposite side of the intermittent light emitting means, and optical axes of the intermittent light and the intermittent light intersect at approximately the center of the slit plate, Each of the light emitting means is configured such that the reflected intermittent light reflected by the reflective wall between the slits is received by the second light receiving means, and the reflected intermittent light reflected by the reflective wall is received by the first light receiving means. and each light receiving means.

"Operation" During normal operation, the intermittent light emitting means and the slit plate,
Regarding the first light receiving means, the first light receiving means passes through the slit.
By processing the number of signals received by the light receiving means on a time axis, the traveling speed of the vehicle can be determined.

Regarding the relationship between the intermittent light emitting means, the slit plate, and the second light receiving means, the speed of the vehicle can be determined by processing the number of intermittent light received by the second light receiving means through the slit on the spatial axis of the slit. Since it is a speed, it is ultimately determined by time axis processing.

Regarding the light reflected by the reflecting wall, the above relationship is the relationship between the continuous light emitting means and the second light receiving means, and the intermittent light emitting means and the first light receiving means.

In any case, output information from two different modes can be obtained and compared.

In addition, the reception mode of the first or second light receiving means when the vehicle is stopped or malfunctions differs depending on whether the light passes through a slit or is received by a reflective wall, and it is easy to determine whether the vehicle is stopped or malfunctioning by determining each mode. can be done.

Furthermore, unlike the conventional system, an external signal generating means for detecting disconnection is not incorporated, so it is possible to determine a failure after the signal generator.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

This example levitates off the ground due to magnetic force, etc.
This shows an application to a floating vehicle without wheels that travels while maintaining a constant gap with the guide rail.

As shown in FIG. 1, the vehicle speed signal generator E includes a slit plate 10 installed on the ground and parallel to a guide rail (not shown) of the vehicle B, and a detection section 20.

The slit plate 10 is connected to the vehicle B as shown in FIG.
Slits 12 having a constant width a are cut at a constant pitch p in a thin plate 11 which is long in the direction of movement of the slits 11, and the middle of each slit 12 forms a reflecting wall 13.

In order to ensure sufficient reflection of light on the reflective wall 13, a suitable material for the thin plate 11 is, for example, a stainless steel plate.

In addition, in this embodiment, the slit 12 is formed in the thin plate 1.
The reflective wall 13 is made by punching out the thin plate 11.
However, in other embodiments, for example, the thin plate 11 may be made of transparent resin, the reflecting wall 13 may have a certain width, and a metal wall may have reflective ability at certain pitches. It is also possible to substantially form slits by pasting or forming thin metal films at regular intervals using a technique such as vapor deposition.

On the other hand, the detection section 20 consists of a sensor section 30 attached to the lower part of the vehicle B and a detector 40 that reads information sent from the sensor section 30, as shown in FIG.

FIG. 3 shows the configuration of the vehicle speed signal generator E.

The sensor section 30 includes two optical fibers 31, 32, 33 from the left and right sides with the slit plate 10 in between.
The openings 34 are placed opposite each other, and are held at the bottom of the vehicle B by a bracket 35, as shown in FIG. And each optical fiber 31, 32, 3
3 and 34 are cables connected to a detector 40 in vehicle B.
guided by.

The optical axes at the opening ends of the optical fibers 31, 32, 33, and 34 are as follows: optical fiber 31 corresponds to optical fiber 33, optical fiber 32 corresponds to optical fiber 34; The reflection optical axis of the optical fiber 31 is the optical axis of the optical fiber 34, and the optical axis of the optical fiber 31 is the optical axis of the optical fiber 34.
The reflection optical axis of No. 2 is arranged to coincide with the optical axis of No. 33.

On the other hand, a detector 40 provided in the vehicle B is provided with a continuous light emitter 36, an intermittent light emitter 37, and two light receivers 38, 39. It is combined with the optical fiber 31 to constitute a continuous light emitting means T1, and hereafter, the intermittent light emitter 37 and the optical fiber 32 constitute an intermittent light emitting means T2.
Also, the first
The light receiving means R1 is composed of a light receiver 39 and an optical fiber 34.
and constitute a second light receiving means R2.

Next, the action will be explained.

First, each light emitting means T1, T2 and each light receiving means R
1 and R2 with the slit plate 10 in between will be explained with reference to FIG.

That is, when the optical axis of each light emitting means T1, T2 exactly passes through the slit 12, and when it is at a position where it is reflected by the reflecting wall 13 (hereinafter simply referred to as the slit side,
It shows what kind of signals each light receiving means R1 and R2 (referred to as the reflection side) receive. On the slit side, R1 receives the continuous light CL of T1 (H signal), and R2 receives the intermittent light DL of T2. Is receiving.

On the other hand, on the reflection side, R1 is the reflected intermittent light RDL of T2.
, R2 receives the (H) signal of the intermittent reflected light RCL of T1.

Therefore, each light emitting means T having the above relationship
FIG. 5 summarizes the signal reception states when the light receiving means R1, T2 and the light receiving means R1, R2 are normal and when one of them is out of order.

In FIG. 5, for example, continuous light emitting means T
1 is out of order.The first light receiving means R1 on the slit side has no signal (L), and the second light receiving means R2 on the reflection side has a signal (L) at the same time. On the other hand, since the intermittent light emitting means T2 side is normal, the intermittent light DL is sent to the second light receiving means R2 on the slit side.
However, on the reflection side, the first light receiving means R1 also receives the reflected intermittent light RDL.

Similarly, when each element fails, its mode is shown, and all are different, so there is no case where it is impossible to determine.

In other words, it is possible to determine the failure state.

In addition, in the normal output state, the continuous light CL and intermittent light DL modes are received on both the slit side and the reflection side, so speed detection in both modes can be obtained and mutual reference can be made.

FIG. 6 schematically shows how the vehicle speed is detected using continuous light CL and intermittent light DL.

Regarding the continuous light CL side of the first light receiving means R1, as the vehicle speed increases, the information on the slit side within a unit time increases, and the vehicle speed can be determined from this. wall 1
The number of intermittent light beams DL from 3 is reduced, and if the degree of decrease is processed in terms of time, the vehicle speed can be determined.

The same applies to the second light-receiving means R2, since vehicle speeds in two modes can be obtained simultaneously, detection can be performed while constantly checking.

In this embodiment, a case has been described in which the invention is applied to a floating vehicle, but it goes without saying that it is also applicable to vehicles other than floating vehicles, such as conventional wheeled vehicles and suspended vehicles.

"Effects of the Invention" According to the speed signal generator for a vehicle according to the present invention, it can be applied to a vehicle that runs away from the ground and does not have wheels. There is no need to provide a separate circuit, a failure after the signal generator can be determined as such, the state of the failure at the time of failure can be determined, two pieces of output information can be obtained, and comparison can be made.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a conceptual diagram of the structure of a vehicle signal generator, Figure 2 is a front view of a slit plate, and Figure 3 is a signal generator. Fig. 4 is an explanatory diagram of the basic mode of the signal, Fig. 5 is a failure determination diagram for each component, Fig. 6 is an explanatory diagram showing the signal generation state when the vehicle is starting and accelerating from a stop, and Fig. 7 is an explanatory diagram of the signal generation state. The figure shows a conventional example and is a circuit configuration diagram when a TG is used. B...vehicle, E...vehicle speed signal generator, a...
Width of slit, p...Pitch of slit, 10...Slit plate, 12...Slit, 13...Reflection wall, 20
...Detection unit, T1...Continuous light emitting means, T2...Intermittent light emitting means, R1...First light receiving means, R2...Second light receiving means, CL...Continuous light, DL...Intermittent light, RCL...Reflected continuous light, RDL... Reflective intermittent light.

Claims (1)

[Claims] 1. A slit plate having a predetermined width and a reflecting wall between each slit and a slit plate connected at a predetermined pitch is provided on the ground along the direction of movement of the vehicle, and the slit plate is sandwiched between the slit plates. , a continuous light emitting means is disposed on one side, and a first light receiving means for receiving continuous light emitted from the continuous light emitting means is fixed to the vehicle body on the other side, and the slit plate is Intermittent light emitting means is provided at a position symmetrical to the continuous light emitting means across the slit plate, and intermittent light emitted from the intermittent light emitting means is received on the opposite side of the intermittent light emitting means with the slit plate in between. A second light receiving means is provided, and the optical axes of the continuous light and the intermittent light intersect at approximately the center of the slit plate, and the reflected continuous light reflected on the reflective wall between the slits is absorbed by the second light receiving means. Similarly, each of the light emitting means and each of the light receiving means are arranged so that the reflected intermittent light reflected by the reflecting wall is received by the first light receiving means. Device.