JPH05301568A - Brake circuit for vehicle - Google Patents

Abstract

PURPOSE:To surely detect the disconnection of a brake command line or of a brake solenoid valve in a brake circuit of a vehicle such as a freight train. CONSTITUTION:A shunt resistor 11 and an ammeter 12 are inserted into a circuit of a brake command line 4 in order to detect the current. From a comparison between the detected current value and a normal value, the disconnection of a brake solenoid valve 71, etc., can be detected. A closed circuit 21 including an emergency brake command line 5 is formed with both a power source 14 for detecting the disconnection, a command line 13 and the like for detecting the disconnection, while this circuit 21 is normally electrified, so that, if the current is detected 'off', the emergency brake command line 5 can be judged disconnected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake circuit of a vehicle such as a freight train and, more particularly, to a technique for detecting a break in the brake circuit.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional brake circuit in a freight train consisting of a locomotive as a brake operated vehicle and a plurality of freight cars as brake operated vehicles connected to the locomotive. In the figure, M is a locomotive, T1 to T
n is a plurality of freight cars connected to the locomotive M, 1 is a power source (on the positive electrode side), 2 is a brake valve as an operation valve for operating on / off of the brake, and 3 is for operating the brake valve 2 to the Yulmé position. Then, the cam switch 3a is closed, and a slack command line as a brake command line that is pressurized by the power source 1 is drawn from the locomotive M to the last freight car Tn. Reference numeral 4 denotes a brake command line in which the cam switch 4a is closed by operating the brake valve 2 to the brake position and the power source 1 pressurizes the same. The brake command line 4 is similarly drawn from the locomotive M to the last freight car Tn.
Reference numeral 5 is an emergency brake command line as a brake command line that is pressed by the power source 1 by closing the cam switch 5a by operating the brake valve 2 in the emergency position. Similarly, from the locomotive M to the last freight car Tn. Has been towed.

On each of the freight cars T1 to Tn, there are mounted slack solenoid valves 61 to 6n, brake solenoid valves 71 to 7n, and emergency solenoid valves 81 to 8n, which are drive valves for driving a brake device of each freight car. The ground line 9 as a brake command line extending from the locomotive M to the last freight car Tn is connected between the slack command line 3, the brake command line 4 and the emergency brake command line 5, respectively. Further, 10 is an indicator light box, and accommodates indicator lights 10a, 10b, 10c which are turned on when the respective command lines 3, 4, 5 are pressurized.

Next, the operation will be described. When a driver on the locomotive M operates the brake valve 2, the voltage of the power source 1 is applied to the command lines 3, 4, 5 by turning on / off the cam switches 3a, 4a, 5a installed on the brake valve 2. To be done. When the brake valve 2 is in the Yulmé position, the freight cars T1 to T
The slack solenoid valves 61 to 6n are pressurized so that the brakes of the freight cars T1 to Tn are slackened. In addition, the brake valve 2
Is in the brake position, the brake solenoid valves 71 to 7n of the freight cars T1 to Tn are pressurized and the brakes of the freight cars T1 to Tn act. When the brake valve 2 is in the emergency position, the emergency electromagnetic valves 81 to 8n of the freight cars T1 to Tn are also provided.
Is applied to actuate the emergency brakes of the freight cars T1 to Tn. Further, when the brake valve 2 is in the weight position, the solenoid valves 61 to 6n and 71 to 7 of the freight cars T1 to Tn are respectively.
No pressure is applied to n and 81 to 8n, and the braking force commanded by the driver is maintained.

[0005]

Since the brake circuit of the conventional freight train is constructed as described above, if the command lines 3, 4, and 5 are disconnected, the brake circuit will not operate and the safety of the vehicle will be improved. Since this becomes a serious problem, at the time of departure, the indicator lights 10a, 10b, 10c of the indicator light box 10 are connected to the command lines 3, 4, 5 of the last freight car Tn, and the brake valve 2 is operated to operate the indicator lights 10a, 10b. It was confirmed that 10c was turned on.

However, even if this confirmation is performed at the time of departure, if the command line between the freight cars is disconnected during traveling thereafter, the brake circuit will be broken and safety cannot be ensured. Further, in the confirmation by the indicator lamp 10a or the like, even when the solenoid valves 6, 7, 8 of any of the freight cars T are not operated due to disconnection, the same is not detected and a security problem remains. ..

The present invention has been made in order to solve the above-mentioned problems, and it is possible to immediately detect the disconnection of the command line and the brake circuit including the electromagnetic valve even while the vehicle is traveling. The purpose of the invention is to obtain a brake circuit for a vehicle.

[0008]

A brake circuit for a vehicle according to claim 1 of the present invention detects a current flowing through an operating valve when the operating valve is turned on and compares the detected current with a normal value. Thus, the disconnection of the drive valve is detected.

According to a second aspect of the present invention, a disconnection detection command line is drawn over each vehicle separately from the brake command value, and the brake command line and the disconnection detection command line are connected in series to each other to form a closed circuit. Further, a disconnection detecting power source is inserted into the closed circuit to detect the current flowing in the closed circuit, and the disconnection of the brake command line is detected from the presence or absence of the detected current.

[0010]

If a part of the solenoid valve of the vehicle is broken, the current supplied from the power source through the operating valve becomes smaller than the normal value, and the change detects the solenoid valve disconnection.

Further, when a part of the brake command line is broken, the current supplied from the power source for wire break detection to the closed circuit is interrupted, and the break of the brake command line is detected from this change.

[0012]

【Example】

Example 1. 1 is a block diagram showing a brake circuit of a freight train according to a first embodiment of the present invention. In the figure,
5, 61 to 6n, 71 to 7n, 81 to 8n and 9 are the same as conventional ones, and the description thereof will be omitted. Reference numeral 11 denotes a shunt resistor inserted in the middle of the brake command line 4 in the locomotive M, and an ammeter 12 is connected in parallel with the shunt resistor 11. 1
3 detects the disconnection of the emergency brake command line 5, so that a disconnection detection command line is newly drawn from the locomotive M to the last freight car Tn, 14 is a power supply for disconnection detection, 15 is a diode,
16 is a limiting resistor inserted in series with the diode 15;
Reference numerals 7 and 18 denote an indicator lamp and a relay, respectively, which are connected in parallel with the limiting resistor 16 and which have a contact 18 a of the relay 18.
Are connected in series with the buzzer 19 to the disconnection detection power supply 14. Reference numeral 20 denotes a short-circuit line connecting the emergency brake command line 5 and the disconnection detection command line 13 in the tail freight car Tn.
3 to form a closed circuit 21. Reference numeral 22 is a diode inserted in the middle of the emergency brake command line 5 to prevent the current of the disconnection detection power supply 14 from flowing backward. The portion surrounded by the dotted line in the figure constitutes the disconnection detection device 23 in a portion added to the conventional technique.

Next, the operation will be described. When the driver on the locomotive M operates the brake valve 2 to the braking position, the cam switch 4a of the brake valve 2 is closed, and the brake electromagnetic valves 71 to 7 are supplied from the power source 1 via the brake command line 4.
A current flows through n to the ground wire 9. This current is also shunted to the ammeter 12 due to the presence of the shunt resistor 11, and its pointer is swung. The deflection of the pointer changes according to the magnitude of the current. That is, since the deflection of the pointer of the ammeter 12 changes depending on the number of brake electromagnetic valves 71 to 7n connected over a plurality of freight cars T1 to Tn, if any of these brake electromagnetic valves 71 to 7n is disconnected. if there is,
As a result, the deflection of the pointer of the ammeter 12 becomes smaller, and the disconnection can be detected.

Here, when the brake command line 4 is broken at a part thereof, the brake solenoid valve 7 of the freight car located behind the broken line is disconnected from the power source 1.
The deflection of the pointer of the ammeter 12 becomes small according to the number of the separated pieces, and these are also detected as the disconnection of the brake electromagnetic valve 7 substantially.

Next, in the emergency brake command circuit, a current is constantly supplied to the emergency brake command line 5 by the power source 14 for disconnection detection, and if the emergency brake command line 5 is normal without any disconnection defect, the closed circuit 21 is provided. Is closed, and indicator light 1
7 is turned on to display a normal state to the driver, and the contact 18a of the relay 18 is opened so that the buzzer 19 does not sound. Here, when the emergency brake command line 5 is broken, the closed circuit 21 is opened, the indicator lamp 17 is extinguished, and at the same time the contact 18a is closed due to the deactivation of the relay 18 and the buzzer 19 is turned off.
Sounds to notify the driver of the abnormality that the emergency brake command line 5 has been disconnected.

Example 2. In the first embodiment, the shunt resistor 11 and the ammeter 12 are provided to detect the disconnection of the brake solenoid valve 7, the disconnection detection command line 13, the disconnection detection power supply 14, etc. are provided to provide the emergency brake command line 5. Although the disconnection detecting device for detecting the disconnection and the disconnection detecting device for both are provided, only one of them may be provided. Further, the former disconnection detection device is not limited to the application to the brake command line 4, and may be applied to the slack command line 3 and the emergency brake command line 5. Further, the latter disconnection detection device is not limited to the case where it is applied to the emergency brake command line 5.

Embodiment 3. Although the ammeter 12 detects the change in the current flowing through the brake command line 4 in the first embodiment, it may be detected by a voltmeter or an indicator lamp.

[0018]

As described above, according to the present invention, when the operation valve is turned on, the current flowing through the operation valve is detected and this current is compared with the normal value. Therefore, the disconnection of the drive valve of each vehicle can be reliably detected. can do.

Further, in the case where a predetermined disconnection detection command line and a power supply for disconnection detection are provided so that the current is always supplied to the brake command line, the disconnection of the brake command line can be reliably detected from the presence or absence of the current. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a brake circuit of a freight train according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a brake circuit of a conventional freight train.

[Explanation of reference signs] 1 power source 2 brake valve as an operation valve 3, 4, 5, 9 respectively a slack command line, a brake command line, an emergency brake command line, a ground line 61 etc. 71 etc. 81 Solenoid solenoid valve, brake solenoid valve, and emergency solenoid valve as drive valves 12 Ammeter 13 Disconnection detection command line 14 Disconnection detection power supply 23 Disconnection detection device M Locomotive as brake operating vehicle T1 etc. As brake operated vehicle Freight car

Claims (2)

[Claims] 1. A brake operating vehicle having a power supply and an operating valve for operating opening and closing of a brake, and a brake operated vehicle having a drive valve connected to the brake operating vehicle and driving a brake device of each vehicle. In the vehicle of the formation, in the brake circuit of the vehicle in which the drive valve is electrically connected to the power source through the operation valve by pulling the brake command line across each of the vehicles, the operation valve is turned on and off. A brake circuit for a vehicle, characterized in that the current flowing through the operating valve is detected at this time, and the detected current is compared with a normal value to detect disconnection of the drive valve. 2. A brake operating vehicle having a power source and an operating valve for operating the opening and closing of the brake, and a brake operated vehicle having a drive valve connected to the brake operating vehicle and driving a brake device of each vehicle. In the vehicle of the formation, in the brake circuit of the vehicle in which the drive valve is electrically connected to the power source through the operation valve by pulling the brake command line across each of the vehicles, the brake command value is Separately, the disconnection detection command line is drawn over each of the vehicles, the brake command line and the disconnection detection command line are connected in series with each other to form a closed circuit, and a disconnection detection power source is further inserted into the closed circuit. A brake circuit for a vehicle, wherein a current flowing through the closed circuit is detected, and a break in the brake command line is detected based on the presence or absence of the detected current.