JPH0728485B2 - Vehicle running control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a travel control of a vehicle, in which a vehicle is provided with a travel distance detecting means, and the travel distance is controlled to travel by an input distance to a destination stop position and then stopped. It relates to the device.

(Prior Art and Problems Thereof) This type of vehicle travel control device is provided with a travel distance detecting means for detecting a count value of transmission pulses of a pulse encoder interlocking with wheels as a travel distance value, and an input destination stop The vehicle is automatically controlled to stop at the destination stop position by comparing and calculating the total travel distance to the position and the actual travel distance obtained by the travel distance detecting means.

In addition, in the travel route of this type of vehicle, apart from the stop position such as a work station that selectively stops the vehicle,
From the viewpoint of ensuring safety, all vehicles must be stopped unconditionally, for example, before the drop lifter installation location to transfer vehicles to other routes or before the confluence / divergence point of the travel route. Since the position is set,
It is necessary to automatically stop the vehicle even at such an absolute stop position.

In order to perform the control as described above, the distance data from the starting point (home position) set in the traveling route to each absolute stop position and the distance data to each stop position that is arbitrarily set are set to the vehicle. It was created and stored by the learning work of actually traveling the vehicle and detecting the traveling distance by the traveling distance detecting means.

In the conventional travel control device that requires such learning work, one vehicle (crane) is used for one travel route having a relatively short overall length and one end serving as a starting point (home position) like an automatic warehouse. In addition, there is no problem if the stop positions set in one travel route are constant and the absolute stop positions are set only at both ends of the travel route, but the total length is long and the layout is complicated. A large number of vehicles must travel along the configured travel route, and each vehicle must travel from one of the multiple stop positions set on the travel route to another arbitrarily selected vehicle. In such transport equipment, it is not practical to learn the travel distance data from the starting point to all stop positions and absolute stop positions for all vehicles, which is not only practical but also stop position. It is also extremely difficult to change.

Moreover, the place where the absolute stop position is set is a very dangerous place even if it is during the learning drive, if the absolute stop is not strictly adhered to, so the learning drive on the traveling route including such an absolute stop position is It had to be done carefully at an absolutely safe speed, which was inefficient and costly.

However, in the case where the vehicle stop control at the absolute stop position during normal work traveling is performed by detecting the absolute stop detected member installed in front of each absolute stop position by the detector on the vehicle side, When the traveling conditions such as speed and load during normal work traveling change, the positions of all detected members for absolute stop must be changed to adjust the vehicle to stop at the absolute stop position with high accuracy. I won't.

(Means for Solving Problems) The present invention proposes a traveling control device capable of solving the above-described conventional problems, and the features thereof are shown in parentheses in reference numerals of embodiments described later. In addition, the address setting member (18), the absolute stop detected member (21), the deceleration detected member (23), the traveling distance detecting means (5, 7), and the address detecting means ( 5-7) and detected member detecting means (5-7)
And a control means (7,12,14) ,. The address setting members (18) are arranged at appropriate intervals on the vehicle travel route side to partition the travel route into a plurality of zones each having a unique address ,. The detected member for absolute stop (21) is used for all vehicles (1).
Is arranged corresponding to the absolute stop position for stopping. The deceleration detected member (23) is arranged at an appropriate distance before the absolute stop detected member (21) ,. Mileage detection means (5,7) and address detection means (5
7) and the detected member detecting means (5-7) are provided in the vehicle (1), and the traveling distance detecting means (5, 7) outputs the transmission pulse of the pulse encoder (5) which is interlocked with the wheel (2). The address detecting means (5 to 7) detects the zone address from the address setting member (18), and the detected member detecting means (5 to 7) detects the absolute stop detected member (21) and the deceleration detected object. Material (2
3) is detected, the control means (7, 12, 14) uses the length data of each zone,
The absolute stop distance data from the start of the zone with the absolute stop position (AS1) to the absolute stop position (AS1) and the destination stop position data are stored. The destination stop position data has each destination stop position. It consists of a combination of the zone address and the distance from the start of the zone to the destination stop position, (a). From these stored data and the current position data of the vehicle, the total travel distance (TLa) to the destination stop position (S1, S2 ...) and the total travel distance (TLb) to the absolute stop position (AS1) passing midway ) And destination stop position (S1, S2 ...)
And deceleration stop control position (L
sa, Lsb) is calculated, and deceleration stop control is performed at each deceleration stop control position (Lsa, Lsb) based on the comparison calculation of each total travel distance and the actual travel distance of the vehicle, and the vehicle (1) is absolutely stopped. Stop at position (AS1) and destination stop position (S1, S2 ...), (b). When the absolute stop distance data is not stored, the vehicle is decelerated to a medium speed when the deceleration detected member (23) is detected, and the vehicle is decelerated and stopped when the absolute stop detected member (21) is detected. It is characterized by

(Example) Hereinafter, one example of the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a plurality of vehicles traveling on the same traveling route, and a speed control inverter 4 of a motor 3 for driving the drive wheels 2, a pulse interlocking with the drive wheels 2. An encoder 5, a photoelectric switch 6, a controller (microcomputer) 7 which is an on-vehicle control unit, and a multiple signal transmission slave station 8 connected to the controller 7 are provided.

The multiple signal transmission slave station 8 of each vehicle 1 is constantly connected to two signal lines 9 laid along the traveling route via a current collector 10, and via the two signal lines 9 to the ground side. Is connected to the master station 11 for transmitting multiple signals. 12 is a sequencer connected to the master station 11 for transmitting multiplex signals via a communication means 13 such as RS232C, 14 is a host controller for giving commands to the sequencer 12, and these sequencer 12 and the host controller 14 Ground-side control means is configured. Reference numeral 15 is a monitor display. 16 is a power line for power supply, which supplies power to the motor 3 of each vehicle 1 via the current collector 17 and the inverter 4.

As shown in FIG. 3, on the travel route of the vehicle 1, address setting members (code plates) 18 are installed at substantially equal intervals so as to divide the travel route into a plurality of zones having substantially the same length, Further, the absolute stop position where all the vehicles 1 must be stopped unconditionally, such as the position before the drop lifter 19 that transfers the vehicle 1 to another route or the point before the confluence 20 of the travel route, is used. A section in which the detection member 21 is installed and the vehicle 1 must decelerate, such as a turn portion of a traveling route.
A detected member 23 for deceleration is installed at the inlet of 22, and a detected member 24 for releasing deceleration is installed at the outlet of the section 22.

It should be noted that the absolute stop detected member 21 is installed at a fixed distance from the absolute stop position, for example, at a position 500 mm before the absolute stopped position as shown in FIG. For example, the deceleration detected member 23 is installed at a position 1000 mm before.

The address setting member 18, the absolute stop detected member 21, the deceleration detected member 23, and the deceleration released detected member 24 are detected by the photoelectric switch 6, and are shown in FIG.
As shown in D to D, the lengths are different from each other, and in particular, each address setting member 18 has a constant total length but has a unique zone address (code).

The above layout of the entire travel route can be replaced with the connection information of the zone address (hereinafter referred to as MAP information), and each vehicle 1 arranged on the travel route has a master station 1 for transmitting multiple signals.
1, MAP information is received from the ground side via the signal line 9 and the multiple signal transmission slave station 8 and stored in the memory of the controller 7.

When the MAP information is given to the vehicle 1, the vehicle 1 is caused to travel over the entire traveling route, and the distance between the address setting members 18, that is, the length of each zone (4 to 6 in FIG. 5). The zone length 4L to 6L) is measured to create distance data for each zone address, and the distance data is stored in the memory of the controller 7 together with the MAP information. Of course, in the zone where the absolute stop detection target member 21 is installed, not only the length of the zone but also the distance from the zone start end to the absolute stop position (7 in FIG. 6).
Measure and store the distance (AS1L) from the start of the number zone to the absolute stop AS1).

The following functions are programmed in the controller 7 in order to create data regarding the length of each zone and the distance from the zone start end to the absolute stop position. That is, as shown in FIG. 7, the zone address unique to the address setting member 18 is determined based on the ON / OFF signal and the count value of the transmission pulse of the pulse encoder 5 while the photoelectric switch 6 is detecting the address setting member 18. Zone address reading function 25 to read, absolute stop to detect the absolute stop detected member 21 from the count value of the transmission pulse of the pulse encoder 5 while the photoelectric switch 6 is detecting the absolute stop detected member 21 Detecting member detecting function 26 for detecting the zone address and the detecting member 21 for absolute stop from each zone length and zone start end by counting the transmission pulses of the pulse encoder 5 based on the zone address read signal and the detecting signal for absolute stop detecting member 21. Section distance measuring function 27 for measuring the distance to (the distance 7La from the start of zone 7 to the member 21 to be detected for absolute stop in Fig. 6), and the measured zone start Distance from the zone start based on the distance to the paired stop the detected member 21 to an absolute stop position (6
The absolute stop position calculation function 28 for calculating the distance AS1L = 7La + 500 mm in the figure) is programmed in the controller 7.

When the vehicle 1 is running for the purpose of creating and storing the above-mentioned distance data (during learning work), deceleration is performed from the detection signal of the photoelectric switch 6 and the count value of the transmission pulse of the pulse encoder 5 as shown in FIG. If the detection target member 23 for detection is discriminated and detected, it is checked from the stored data whether or not the absolute stop position is within a certain distance, and it is unknown at this point whether or not the absolute stop position is within the certain distance. The traveling speed of 1 is automatically reduced to a preset medium speed. When the deceleration-released detection target member 24 is discriminated and detected, the traveling speed of the vehicle 1 is automatically accelerated to a preset high speed. If the absolute stop detected member 21 is detected after the deceleration detected member 23 is detected, the absolute stop detected member 21 is detected.
The presence / absence of stored data regarding 21 is checked. Since there is currently no stored data regarding the detected member 21 for absolute stop, deceleration stop control is immediately performed.

Therefore, as shown by the broken line in FIG. 6, the vehicle 1 starts to decelerate halfway at the position of the deceleration detected member 23, and is controlled to decelerate and stop from the medium speed at the position of the absolute stop detected member 21. The vehicle 1 will automatically stop before the absolute stop position. If the vehicle is not decelerated to the medium speed, the vehicle is decelerated and stopped from the high speed at the position of the detected member 21 for absolute stop. Therefore, as shown by the phantom line in FIG. Depending on the situation, it may stop beyond the absolute stop position. The vehicle 1 stopped in the vicinity of the absolute stop position can start traveling again by a start command from the ground side, and can continue the creation and storage work of the distance data.

The zone address read by the zone address reading function 25 by each running vehicle is sent from the slave station 8 for multiple signal transmission to the master station 11 for multiple signal transmission via the signal line 9 together with the vehicle identification number unique to each vehicle 1. To be Then, the master station 11 sends the information to the sequencer 12 via the communication means 13, and as a result, the sequencer 12
Can know in which zone each vehicle 1 is located. Furthermore, if there is a request from the ground side, the division distance measurement function
The distance measured by 27, that is, the distance from the start end of the zone to which the vehicle 1 belongs to the vehicle 1 can be sent to the ground side by the multiple signal transmission system as the current detailed position information of the vehicle 1. In this case, since the distance is processed by the number of pulses, it is desirable that the distance is converted to the unit of mm and sent to the ground side.

On the other hand, on the ground side, for each destination stop position (stop position S2 and S3 in FIG. 5) that is arbitrarily set regardless of the position of each address setting member 18, the zone address to which it belongs and the destination from the start end of the zone. Destination stop position data consisting of a combination of distances to stop positions is created and
It is stored in 14 memories. The distance to each destination stop position is measured and entered in mm.

Next, the traveling control method of the vehicle 1 will be specifically described. Now, as shown in FIG. 5, the stop position S2 in the zone 4 is temporarily stopped.
When the destination is set to drive the vehicle 1 stopped at to the destination stop position S3 in the zone 6,
As shown in FIG. 8, the destination stop position data 29 created and stored as described above is searched for the data of the destination stop position S3, that is, [No. 6 zone / 1800 mm], and this data is retrieved from the ground side at the stop position S2. It is sent to the vehicle 1 to be controlled, which is stopped at, via the multiple signal transmission system.

A total mileage calculation function 30a is programmed in the controller 7 of the vehicle 1, and data of the destination stop position S3 [6
Zone No. 1800 mm], the length 4 L of the No. 4 zone retrieved from the data 31a relating to each zone length created and stored as described above, the current position of the vehicle 1 obtained from the section distance measuring function 27 (No. 4 zone Distance from start to stop position S2 2200
The total travel distance TLa from the stop position S2 to the destination stop position S3 = 4L-2200 (mm) + 5L + 1800 (mm) is calculated based on the number of pulses corresponding to mm) and the length 5L of the fifth zone. Since all the internal processing including the stored data is performed with the number of pulses, the distance value (1800 mm) given from the stop position data 23 is converted into the number of pulses. This total travel distance (number of pulses) TLa is preset in the subtraction function 32a for calculating the remaining travel distance.

On the other hand, the controller 7 of each vehicle 1 uses the DIP switch on the microcomputer board of the controller 7 to set each speed value of high speed (conveyance speed), medium speed (turn and transfer speed) and low speed (positioning speed), and acceleration. And deceleration is set. Therefore, as described above, the total mileage TLa
Is calculated, the deceleration stop control position calculation function 33a programmed in the controller 7 determines, for example, the destination shown in FIG. 5 based on the traveling speed condition and the total traveling distance TLa which are preset as described above. The distance Lsa from the stop position S3 to the deceleration start position is calculated.

When the start command is given from the host controller 14 on the ground side to the vehicle 1 stopped at the stop position S2 via the sequencer 12 and the multiple signal transmission system, the vehicle 1 starts traveling. Simultaneously with the start of running of the vehicle 1, the total travel distance TLa preset in the subtraction function 32a is subtracted by the transmission pulse from the pulse encoder 5, and the remaining travel distance Lta is output.

When the vehicle 1 travels to a position where the remaining travel distance Lta and the calculated distance Lsa are equal, predetermined deceleration stop control is performed,
The vehicle 1 finally reaches the destination stop position S3 at a predetermined low speed (positioning speed), and automatically stops at the destination stop position S3. Of course, at this time, the remaining travel distance Lta is zero or a value within the allowable error range. The controller 7 controls the inverter 4 by the encoder feedback method using the transmission pulse of the pulse encoder 5 so that the vehicle 1 travels accurately under the traveling speed condition set as described above.

In the controller 7 of the vehicle 1, the destination stop position input as shown in FIG. 9 and the current position of the vehicle 1 and the data regarding each absolute stop position created and stored as described above (from the zone address and the zone start end) (Distance to absolute stop position) 31b is programmed to search for an absolute stop position on the way to the destination stop position. Therefore, as shown in FIG. 6, when the absolute stop position AS1 exists on the input travel route to the destination stop position,
The total travel distance calculation function 30b calculates the total travel distance TLb to the absolute stop position AS1 = the total travel distance to the start of zone 7 + MS1L, and this total travel distance (number of pulses) TLb
Is preset in the subtraction function 32b for calculating the remaining travel distance.

On the other hand, when the total travel distance TLb is calculated as described above, the deceleration / stop control position calculation function 33b causes, for example, the sixth speed based on the travel speed condition and the total travel distance TLb set in advance as described above. The distance Lsb from the absolute stop position AS1 to the deceleration start position shown in the figure is calculated.

Simultaneously with the start of traveling of the vehicle 1, the total traveling distance TLb preset in the subtraction function 32b is subtracted by the transmission pulse from the pulse encoder 5, and the remaining traveling distance Ltb is output.
When the vehicle 1 travels to a position where the remaining travel distance Ltb and the calculated distance Lsb are equal to each other, predetermined deceleration stop control is performed as shown in FIG. 6 actual battle, and the vehicle 1 finally reaches a predetermined low speed (positioning). Will reach the absolute stop position AS1 at the speed) and automatically stop at the absolute stop position AS1. Of course, at this time, the remaining travel distance Ltb is zero or a value within the allowable error range.

The vehicle 1 that has automatically stopped at the absolute stop position starts traveling in accordance with a start command given from the ground side, but if another absolute stop position exists before the destination stop position,
By the control similar to the above, the automatic stop is automatically performed again at the absolute stop position, and finally, the automatic stop is automatically performed at the target destination stop position by the control described with reference to FIG.

Note that, as in the case where the vehicle 1 is traveling for distance data creation / storage work (during learning work traveling), as shown in FIG. If there is a place where the detected member for deceleration 23 or the detected member for deceleration release 24 that is not associated with
As shown in FIG. 10, the traveling speed of the vehicle 1 is set to a predetermined medium speed at the time when the deceleration detected member 23 is discriminated and detected from the detection signal of the photoelectric switch 6 and the count value of the transmission pulse of the pulse encoder 5. Is automatically decelerated until the traveling speed of the vehicle 1 is automatically accelerated to a preset high speed when the deceleration release detection target member 24 is detected.

Further, even when the traveling is controlled to automatically stop at the absolute stop position as described above, the deceleration detected member 23 and the absolute stop detected member 21 are sequentially detected before the absolute stop position. However, in this case, since it is found that there is an absolute stop position within a certain distance with respect to these detected members 23, 21, the deceleration detected member 23 and the absolute stop detected member 21 No control associated with detection is performed.

In the above embodiment, the traveling distance detecting means for counting the transmission pulses of the pulse encoder 5 is the pulse encoder 5
And the controller 7, and the address detecting means for detecting the zone address from the address setting member 18 and the detected member detecting means for detecting the absolute stop detected member 21 and the deceleration detected member 23 are the pulse encoder 5 and It is obvious that it is composed of the photoelectric switch 6 and the controller 7, and that the control means is composed of the controller 7 which is the vehicle-mounted control means and the sequencer 12 and the host controller 14 which are the ground side control means.

(Operation and Effect of the Invention) As is apparent from the above-described embodiments, the features of the configuration of the traveling control device of the present invention are first described (means for solving the problem).
There is a configuration requirement listed in the section of.

According to the traveling control device of the present invention, A. the length data of each zone of the traveling route, the distance data between the absolute stop position that unconditionally stops all vehicles and the immediately preceding zone start point, and the vehicle Destination stop position data for selectively stopping the destination stop position data is stored, and the destination stop position data consists of a set of a zone address to which each destination stop position belongs and a distance between the start end of the zone and the destination stop position. Therefore, from this stored data and the current position data of the vehicle (distance data from the zone to which it belongs and its starting point), the total travel distance (TLa) to the target stop position and the total travel distance to the absolute stop position ( TLb) can be easily calculated regardless of the current position of the vehicle, and the vehicle travels for the calculated total mileage to determine not only the final destination stop position but also the absolute stop position in the middle. In can also be automatically stopped.

Therefore, a large number of vehicles travel along a travel route having a long overall length and a complicated layout, and a large number of destinations set in the travel route irrespective of the zone partition address setting member (18). Even in a transport facility that has a stop position and an absolute stop position that unconditionally stops all vehicles for safety, from one of the destination stop positions to another arbitrarily selected While the vehicle is automatically stopped even at an absolute stop position on the way, it is possible to accurately control the traveling by a traveling control method using a so-called encoder system.

B. In order to perform the above-mentioned traveling control, learning work is required to store length data of each zone or distance data from the zone start end to the absolute stop position or the destination stop position in advance. In this case, an address detecting means (5-7) for detecting the zone address, and a detected member detecting means (5-7) for detecting the absolute stop detected member (21),
With the traveling distance detecting means (5, 7), it is possible to perform the learning work for obtaining the above-mentioned data from any position in the traveling route.

Therefore, even in the transfer facility as described above, a plurality of vehicles can share the necessary learning work efficiently and accurately.

C. In particular, according to the present invention, the control for automatically stopping at the absolute stop position during the normal work traveling of the vehicle is based on the calculated total traveling distance (TLb), just like the control for automatically stopping at the destination stop position. This is performed by a so-called encoder method, and is not performed based on the detection signal of the absolute stop detected member (21).

Therefore, the deceleration point to the middle speed before the absolute stop position and the deceleration stop control point from the middle speed are also independent of the positions of the deceleration detected member (23) and the absolute stop detected member (21). It can be set on a program according to the traveling conditions such as the traveling speed and load of the vehicle at that time, and the vehicle can be smoothly decelerated and accurately stopped automatically at the absolute stop position. In other words, it is not necessary to change the position of the detected member for deceleration (23) or the detected member for absolute stop (21) even if running conditions such as speed and load change, and change the setting in the program. Only then can the vehicle be automatically and smoothly stopped at the absolute stop position as expected.

D. Moreover, the detected member for absolute stop (21) is installed corresponding to the absolute stop position, and the detection means (5 to 7) for the detected member (21) is provided. As described above, it is possible to easily and easily obtain the distance data regarding the absolute stop position during learning work, but in the situation where the distance data regarding the absolute stop position is not available, for example, for absolute stop for the first time when learning work is running. Detected member (21)
When you encounter the
Detected member for deceleration (23) installed before the appropriate distance from 1)
The vehicle is decelerated to a medium speed based on the detection by the detecting means (5 to 7), and the vehicle is detected based on the detecting means (5 to 7) detecting the absolute stop detected member (21). Since the vehicle is decelerated and stopped, the vehicle can be smoothly and reliably automatically stopped in the vicinity of the absolute stop position to ensure safety even during learning work that cannot be automatically stopped at the absolute stop position by the encoder method. I can.

In other words, the absolute stop detection target member (21) and the deceleration detection target member (23) stop the vehicle at the absolute stop position according to the traveling conditions (low speed traveling without load) during learning work traveling. It becomes possible to install it like.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a signal transmission system between the ground-side control means and each vehicle, FIG. 2 is a schematic diagram illustrating the configuration of the vehicle, and FIG. 3 is a diagram showing a layout of traveling routes, FIG. 4 is a side view showing various control target detection members installed on the travel route side, FIGS. 5 and 6 are diagrams for explaining a specific section of the travel route, and FIGS. 7 to 9 are controls. FIG. 10 is a block diagram for explaining the function of the means, and FIG. 10 is a flowchart for explaining the speed control procedure. 1 ... Vehicle, 2 ... Drive wheel, 3 ... Motor, 4 ... Inverter, 5 ... Pulse encoder, 6 ... Photoelectric switch, 7 ... Controller, 8 ... Multiple signal transmission slave station,
9 ... Signal line, 11 ... Master station for transmitting multiple signals, 12 ... Sequencer, 13 ... Communication means, 14 ... High-order controller, 16
...... Power supply power line, 18 ...... Address setting member, 21 ...... Absolute stop detected member, 23 ...... Deceleration detected member, 24 ...... Deceleration release detected member.

Claims (1)

[Claims] 1. An address setting member (18), an absolute stop detected member (21), a deceleration detected member (23), a traveling distance detecting means (5, 7), and an address detecting means (5). To 7), detected member detection means (5 to 7), and control means (7, 12, 14), the address setting members (18) are arranged at appropriate intervals on the vehicle travel route side. Then, the travel route is divided into a plurality of zones each having a unique address, and the member to be detected (21) for absolute stop is arranged corresponding to the absolute stop position where all vehicles (1) are stopped. The detection target member (23) is for the absolute stop detection member (2
1) is provided at a suitable distance, and the traveling distance detecting means (5, 7), the address detecting means (5-7), and the detected member detecting means (5-7) are provided in the vehicle (1), The traveling distance detecting means (5, 7) counts the transmission pulses of the pulse encoder (5) that is interlocked with the wheel (2), and the address detecting means (5-7) detects the zone address from the address setting member (18). However, the detected member detecting means (5 to 7) detects the absolute stop detected member (21) and the deceleration detected member (23), and the control means (7, 12, 14) determines the length of each zone. Data, the absolute stop distance data from the start of the zone with the absolute stop position (AS1) to the absolute stop position (AS1), and the destination stop position data are stored, and the destination stop position data is stored in each destination. It consists of a combination of the zone address where the stop position is and the distance from the start end of the zone to the destination stop position. From the stored data and the current position data of the vehicle, the total travel distance (T1) from the destination stop position (S1, S2 ...)
La), the total travel distance (TLb) to the absolute stop position (AS1) passing halfway, and the deceleration stop control position (Lsa, Lsb) for the destination stop position (S1, S2 ...) and the absolute stop position (AS1)
Is calculated, and the deceleration stop control is performed at each deceleration stop control position (Lsa, Lsb) based on the comparison calculation between each total travel distance and the actual travel distance of the vehicle, and the vehicle (1) is stopped at the absolute stop position (AS1).
When the vehicle is stopped at the destination stop position (S1, S2 ...) and absolute stop distance data is not stored, the vehicle is decelerated to medium speed when the deceleration detected member (23) is detected, and the absolute stop detected is detected. A vehicle travel control device that controls the vehicle to decelerate and stop when a member (21) is detected.