JP2003137144A - Connection detecting circuit of stop lamp for trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a lighting visual check of a stop lamp for a trailer easily and speedily and prevent consuming battery power uselessly and security trouble due to erroneous operation of a check switch in a connection detecting circuit of the stop lamp for a trailer. SOLUTION: A dc power fuse 31a is connected to a brake pedal switch 34 via a stop lamp relay 33 for a trailer while the contact of the stop lamp relay 33a is serially connected to the stop lamp 22 for a trailer via a stop lamp sensor 37 and a connection connector 25. A time lag relay 38 operating only for a predetermined time and the check switch 39 are parallel connected to the stop lamp relay 33 for a trailer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailer stop lamp connection detection circuit for detecting a trailer stop lamp connection state when a trailer is connected to a tractor.

[0002]

2. Description of the Related Art A tractor is constructed by mounting front and rear wheels on a frame extending in the front and rear direction and mounting a cab on the front portion. In the trailer, rear wheels are mounted on a frame extending in the front-rear direction, a container is mounted, and a front end portion of the trailer can be connected to a rear portion of the tractor via a kingpin. When connecting the trailer to the tractor, it is necessary to connect the vehicle bodies to each other with a kingpin and also to connect the electric system and the air system.

In this case, a stop lamp is provided at the rear ends of the tractor and the trailer, and it is stipulated by law that the tractor stop lamp and the trailer stop lamp are turned on at the same time when the driver depresses the brake pedal. . Therefore, the driver needs to confirm that the tractor stop lamp and the trailer stop lamp are turned on at the same time when the trailer is connected to the tractor. Conventionally, the trailer stop lamp was visually checked to see if the trailer stop lamp was lit while the trailer brake lever was in operation, and to check for poor connections, disconnections, or bulbs.

[0004]

However, due to the revision of the regulations, it is prohibited to hold the trailer brake lever in the operating state, which makes it difficult for the driver to visually confirm the lighting of the trailer stop lamp. Therefore, it is necessary for checking work such as poor connection of electric system, disconnection, burnout, etc.
There is a problem that the number of workers is required, the working time is long, and the workability is deteriorated.

Japanese Patent Laid-Open No. 50-134793 discloses a brake switch for lighting a stop lamp, a switch in parallel with the brake switch, and the switch is turned on regardless of the brake switch. A stop lamp disconnection check circuit that confirms whether the stop lamp is lit has been proposed. However, this disconnection check circuit is for checking the disconnection of the stop lamp provided in the passenger car, and is not for checking the lighting of the trailer stop lamp when the trailer is connected to the tractor. Cannot be applied to trailers. Further, in this disconnection check circuit, the changeover switch is arranged in the vicinity of the stop lamp. Therefore, if the changeover switch is turned on accidentally when the vehicle is parked or by mischief, the stop lamp will continue to light up. This may deviate from the original purpose of lighting the stop lamp, which is to inform the vehicle of the braking operation of the vehicle, and not only impair safety but also wastefully consume battery power.

The present invention solves such a problem, and makes it easy to visually check the lighting of the stop lamp for the trailer in a short time, and wasteful consumption of battery power due to erroneous operation of the check switch and safety. It is an object of the present invention to provide a stop lamp connection detection circuit for a trailer that prevents problems.

[0007]

In order to achieve the above object, in the trailer stop lamp connection detection circuit according to the invention of claim 1, a stop lamp relay for lighting the trailer stop lamp by operating a brake pedal is provided. A time lag relay that lights the trailer stop lamp only for a preset predetermined time is connected in parallel with the stop lamp relay, and a check switch that operates the time lag relay is provided.

Therefore, when the check switch is turned on,
Since the time lag relay operates and the trailer stop lamp can be turned on, it is possible to visually check the lighting of the trailer stop lamp on the battery during this time to detect the connection state, that is, the connection failure, disconnection, burnout, etc. The trailer stop lamp can be visually checked easily for lighting in a short time. Further, even if the vehicle starts traveling after being turned on, the stop lamp is always turned off after a predetermined time has passed by the time lag relay, so that the stop lamp is not continuously turned on during traveling.

In the trailer stop lamp connection detection circuit of the second aspect of the present invention, the check switch is provided in the cab of the vehicle. Therefore, it is possible to prevent the check switch from being turned on due to an erroneous operation or an outsider's mischief, and to prevent a safety problem due to continuous lighting of the stop lamp and wasteful consumption of battery power.

In the trailer stop lamp connection detection circuit according to the third aspect of the present invention, the vehicle stop energizing switch that energizes only when the vehicle is stopped is connected in series with the time lag relay. Therefore, even if the check switch is accidentally turned on while the vehicle is running, the vehicle stop energization switch is turned off, so the trailer stop lamp does not light up without the time lag relay operating, and the stop lamp It is possible to solve the safety problem due to incorrect lighting.

Embodiments of the present invention will be described in detail below with reference to the drawings.

[0012]

1 is a schematic view of a trailer stop lamp connection detection circuit according to an embodiment of the present invention, FIG.
Fig. 3 shows the outline of the procedure for visually confirming the lighting of the stop lamp for the trailer, and Fig. 3 shows the outline of the connection state of the tractor and the trailer.

First, a vehicle to which the trailer stop lamp connection detection circuit of the present embodiment is applied will be described. As shown in FIG. 3, the tractor 11 is configured such that front and rear wheels 13 and 14 are mounted on a frame 12 extending in the front and rear, and a cab 15 having a driver's seat is mounted on a front portion. The trailer 16 is a frame 1 that extends in the front-rear direction.
A rear wheel 18 is mounted on the vehicle 7, and a container 19 capable of loading luggage is mounted thereon, and a front end portion thereof can be connected to the frame 12 of the tractor 11 via a kingpin 20. Then, stop lamps 21 and 22 are provided at the rear end portions of the tractor 11 and the trailer 16, respectively.

When the trailer 16 is connected to the tractor 11, as described above, the frames 12 and 17 are connected to each other by the king pin 20, and the electric system and the air (brake) system are also connected. That is, the electrical system
Each electric wiring 23, 2 on the tractor 11 side and the trailer 16 side
4 is connected using the connector 25. On the other hand, the air system connects the air pipes (not shown) on the tractor 11 side and the trailer 16 side using connection pipes.

In the trailer stop lamp connection detection circuit of this embodiment, as shown in FIG. 1, the tractor stop lamp 21 is connected to the DC power supply fuse 31a through the contact 32a of the stop lamp relay 32. . A brake pedal (air brake) switch 34, an exhaust brake switch 35, and a trailer brake lever switch 36 are connected in parallel to the DC power supply fuse 31b via a trailer stop lamp relay 33. A stop lamp sensor 37 for detecting disconnection of the trailer stop lamp 22 is connected in series to the contact 33a of the stop lamp relay 33, and the trailer stop lamp 22 connected by the connection connector 25 is connected in series. Has been done.

A time lag relay 38 for lighting the trailer stop lamp 22 only for a preset time is connected to the DC power supply fuse 31a in parallel with the trailer stop lamp relay 33. And
A check switch 39 for operating the time lag relay 38 is connected to the time lag relay 38, and a wheel park brake switch 40 is connected in series. This wheel park brake switch 4
0 functions as a vehicle stop energizing switch that energizes only when the vehicle is stopped. Also, time lag relay 3
A contact 38 a of 8 is connected to the stop lamp sensor 37, and an alarm 41 is connected to the stop lamp sensor 37.

The brake pedal switch 34, the exhaust brake switch 35, the trailer brake lever switch 36, the check switch 39, and the wheel park brake switch 40 are arranged in the cab 15.

Here, the trailer 1 for the tractor 11
6 connection work and trailer stop lamp 22
The connection detection work of will be described.

As shown in FIGS. 1 and 2, work procedure W1
With the vehicle stopped, the operation state of the wheel park brake (wheel park brake switch 40 is turned on) is confirmed in work procedure W2. Next, in the work procedure W3, the driver goes out of the cab 15 and performs the connecting and connecting work of the trailer 16 to the tractor 11. That is, the frame 17 of the trailer 16 is connected to the frame 12 of the tractor 11 via the king pin 20, and the electrical wirings 23 and 24 on the tractor 11 side and the trailer 16 side are connected by the connector 25.
And the trailer 16 and the tractor 11 side.
Connect each side air pipe using the connecting pipe.

Then, in the work procedure W4, the driver turns on the ignition key switch. Then, in the work procedure W5, the driver turns on the check switch 39 of the trailer stop lamp 22. Then, the time lag relay 38 is energized for a predetermined time (for example, 5 minutes).
It only operates and can be turned on when the trailer stop lamp 22 is properly connected.

By this connection work, when the electric wires 23, 24 on the tractor 11 side and the trailer 16 side are correctly connected by the connection connector 25, the DC power supply fuse 3
From 1a, the stop lamp sensor 37 is energized via the time lag relay 38, and the trailer stop lamp 22 is energized via the connection connector 25, and the trailer stop lamp 22 is turned on. Therefore, the driver can visually confirm the lighting of the trailer stop lamp 22 in the work procedure W6.

On the other hand, if the electric wirings 23 and 24 on the tractor 11 side and the trailer 16 side are not properly connected, or if the wire breakage or the ball breakage occurs, the trailer stop lamp 22 does not light. Therefore, in the work procedure W6, the driver cannot visually check the lighting of the trailer stop lamp 22, and the connector 2
Check the connection status according to item 5, check for wire breaks, and ball breaks, and take appropriate measures. Further, in this case, the stop lamp sensor 37 detects the lighting failure of the trailer stop lamp 22 and issues an alarm 41 to the driver.

After that, in the work procedure W7, the time lag relay 38 is turned off after a predetermined time elapses, or the work procedure W8 is performed.
When the wheel park brake is released for starting the vehicle and the time lag relay 38 is turned off by turning off the wheel park brake switch 40, the DC power supply fuse 31a is connected to the trailer stop lamp 22 at work procedure W9.
The trailer stop lamp 2 is no longer energized.
2 goes out. Thereafter, in work procedure W10, the driver can start the vehicle.

Incidentally, the trailer 16 is attached to the tractor 11.
Is properly connected and connected, the driver operates the brake pedal switch 34 and the exhaust brake switch 3
5. When any of the trailer brake lever switches 36 is operated, the stop lamp relays 32, 33 are energized and operate, and the DC power supply fuse 31a is connected to the tractor stop lamp 21 via the contact 32a of the stop lamp relay 32. While energized and lit, the DC power supply fuse 31a to the trailer stop lamp relay 3
3, the trailer stop lamp 22 can be energized and turned on via the stop lamp sensor 37 and the connector 25.

As described above, in the trailer stop lamp connection detection circuit of this embodiment, the brake pedal switch 34 is connected to the DC power supply fuse 31a via the trailer stop lamp relay 33, while the stop lamp relay is connected. The trailer stop lamp 22 is connected in series to the contact 33a of 33 through the stop lamp sensor 37 and the connector 25, and the time lag relay 38 and the check switch 39 are operated only for a predetermined time.
Is connected in parallel with the trailer stop lamp relay 33.

Accordingly, when the check switch 39 is turned on, the time lag relay 38 is activated and the trailer stop lamp 22 can be turned on for a predetermined time. During this time, the driver visually confirms that the trailer stop lamp 22 is turned on. It is possible to easily perform connection failure, disconnection, ball breakage, etc. in a short time.

Further, in the present embodiment, the check switch 39 is provided in the cab 15, so that the check switch 39 is prevented from being turned on due to an erroneous operation or an outsider's mischief, and the trailer stop lamp 22 is continuously turned on for safety. It is possible to prevent the above problems and wasteful consumption of battery power. Furthermore,
A wheel park brake switch 40, which energizes only when the vehicle is stopped, is connected to the time lag relay 38 and the check switch 39, and the time lag relay 38 does not operate even if the check switch 39 is accidentally turned on while the vehicle is traveling. The trailer stop lamp 22 will not be erroneously lighted, and the reduction in traveling safety can be prevented.

[0028]

As described above in detail in the embodiments, according to the trailer stop lamp connection detection circuit of the invention of claim 1, a stop lamp relay for lighting the trailer stop lamp by operating the brake pedal is provided. , A time lag relay that lights the trailer stop lamp only for a preset time is connected in parallel with the stop lamp relay, and a check switch that operates the time lag relay is provided.When the check switch is turned on, the time lag relay operates. The trailer stop lamp can then be turned on for a specified period of time.By connecting the trailer stop lamp to the battery during this period, the trailer stop lamp can be visually checked to see if it is connected, that is, if there is a connection failure or disconnection. Detecting, out of ball, etc. Can, it is possible to perform lighting visual check of the trailer stop lamp easily in a short time.

According to the trailer stop lamp connection detection circuit of the second aspect of the invention, since the check switch is provided in the cab of the vehicle, the check switch is prevented from being turned on by an erroneous operation or an outsider's mischief. It is possible to prevent wasteful consumption of battery power due to continuous lighting of the stop lamp.

According to the trailer stop lamp connection detection circuit of the third aspect of the present invention, since the vehicle stop energizing switch that energizes only when the vehicle is stopped is connected in series with the time lag relay, the check switch is erroneously run while the vehicle is running. Even if the switch is turned on, the vehicle stop energization switch is turned off, so the time lag relay does not operate and the trailer stop lamp does not light up, and the safety problem due to incorrect lighting of the stop lamp is solved. You can

[Brief description of drawings]

FIG. 1 is a schematic diagram of a trailer stop lamp connection detection circuit according to an embodiment of the present invention.

FIG. 2 is a schematic view of a procedure for visually confirming lighting of a trailer stop lamp.

FIG. 3 is a schematic diagram showing a connected state of a tractor and a trailer.

[Explanation of symbols]

11 Tractor 15 Cab 16 Trailer 20 King Pin 21 Tractor Stop Lamp 22 Trailer Stop Lamp 23, 24 Electrical Wiring 25 Connector 31a, 31b DC Power Fuse (Battery) 32 Tractor Stop Lamp Relay 33 Trailer Stop Lamp Relay 34 Brake Pedal Switch 37 Stop lamp sensor 38 Time lag relay 39 Check switch 40 Wheel park brake switch (vehicle stop energizing switch)

Claims (3)

[Claims] 1. A trailer stop lamp connection detection circuit for detecting a connected state of a trailer stop lamp in a state where a tractor stop lamp and a trailer stop lamp are connected to a battery, and a trailer stop is operated by operating a brake pedal. A stop lamp relay for turning on the lamp, a time lag relay connected in parallel with the stop lamp relay for turning on the trailer stop lamp only for a predetermined time set in advance, and a check switch for operating the time lag relay were provided. A trailer stop lamp connection detection circuit characterized by the above. 2. The trailer stop lamp connection detection circuit according to claim 1, wherein the check switch is provided in a cab of the vehicle. 3. The trailer stop lamp connection detection circuit according to claim 1, wherein a vehicle stop energizing switch that energizes only when the vehicle is stopped is connected in series with the time lag relay. Detection circuit.