Dual-source trolleybus line splitting system and line splitting method

Abstract

The present invention provides a dual-source trolleybus branching system, comprising a branching resistor, wherein the branching resistor is connected to a high-voltage line network via a branching relay to form a branching loop, and a branching switch is further provided in the high-voltage line network; an auxiliary relay and a current sensor are further connected in series between the branching resistor and the branching relay; a first input pin of a branching controller is connected to the high-voltage line network, a second input pin is connected to the current sensor, a first output pin is connected to an alarm bell, and a second output pin is connected to the auxiliary relay; by adding the branching controller, the auxiliary relay, and the current sensor, the state of the branching switch can be monitored in real time, the conduction time of the branching relay can be calculated, the on-off of the branching circuit and the alarm bell can be controlled, thereby avoiding the phenomenon of heating and smoking of the branching resistor and effectively solving the problem of adhesion of the branching relay, which leads to the inability to branch.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-source trolleybuses, and in particular to a dual-source trolleybus line splitting system and a line splitting method. Background Art

[0002] In the prior art, dual-source buses all use splitter resistors to implement the splitter function. Figure 1 As shown, the primary function of the tap relay K2 in the tapping system is to connect or disconnect the tap resistor R and the DC high-voltage line network equipped with the tap switch K1. When tap resistor R is connected, it forms a loop with the DC high-voltage line network. Current flows through the tap coil, generating suction that draws in the guide tongue, completing the tapping.

[0003] Occasionally, after completing a bus split, the driver may press the split switch K1 but forget to restore it, or the split relay K2 may become stuck. This causes a high current to flow through the split resistor R for a long time, causing it to heat up and smoke. This can eventually burn out the split resistor R, making the bus unable to perform the split function and forcing it to stop, seriously affecting travel efficiency. Even if the bus is driving normally, the driver's accidental touch or incorrect operation may also cause the split resistor R to heat up and smoke. Therefore, existing vehicles often have the following problems during the split process:

[0004] 1) The network voltage is unstable, resulting in unstable current through the branch relay K2, and ultimately the branching is unsuccessful.

[0005] 2) The branch resistor R consumes electrical energy and converts it into heat, reducing the power utilization rate of the line network.

[0006] 3) If the branch relay is stuck or the driver makes an operating error, the branching will fail. In serious cases, the branch resistor R may even be burned.

[0007] Therefore, there is an urgent need to provide a dual-source trolleybus line splitting system and a line splitting method to solve the above-mentioned existing rights and problems in the prior art. Summary of the Invention

[0008] In order to solve the defects and shortcomings in the prior art, the present invention provides a dual-source trolleybus line splitting system and a line splitting method.

[0009] The technical solution provided by the present invention is as follows: a dual-source trolleybus branching system, comprising a branching resistor (R), wherein the branching resistor (R) is connected to a high-voltage line network via a branching relay (K2) to form a branching loop, and a branching switch (K1) is further provided in the high-voltage line network;

[0010] A secondary relay (K3) and a current sensor (SI) are also connected in series between the branch resistor (R) and the branch relay (K2);

[0011] The first input pin (P1) of the branch line controller (C) is connected to the high-voltage line network, the second input pin (P2) is connected to the current sensor (SI), the first output pin (J1) is connected to the alarm bell (Q), and the second output pin (J2) is connected to the auxiliary relay (K3).

[0012] Furthermore, the branch line controller (C) detects the state of the branch line switch in real time through the first input pin (P1).

[0013] When the branch switch (K1) is pressed, the signal of the first input pin (P1) changes from low level to high level;

[0014] When the branching switch (K1) is reset, the signal of the first input pin (P1) changes from a high level to a low level.

[0015] Furthermore, the branch controller (C) receives the signal fed back by the current sensor (SI) in real time through the second input pin (P2).

[0016] When the value flowing through the current sensor (SI) is greater than the preset reference current, the second input pin (P2) input is a high level;

[0017] When the value flowing through the current sensor (SI) is less than a preset reference current, the second input pin (P2) input is a low level.

[0018] Furthermore, when the alarm bell (Q) is required to work, the branch line controller (C) outputs a high level through the first output pin (J1);

[0019] When the alarm bell (Q) is not required to work, the branch line controller (C) outputs a low level through the first output pin (J1).

[0020] Furthermore, when the coil of the auxiliary relay (K3) needs to be closed, the branch line controller (C) outputs a high level through the second output pin (J2);

[0021] When the auxiliary relay (K3) coil is not required to be closed, the branch line controller (C) outputs a low level through the second output pin (J2).

[0022] A line splitting method for a dual-source trolleybus line splitting system is also proposed, comprising the following steps:

[0023] 1) The branch controller initializes the system and resets the system parameters;

[0024] 2) Determine the state of the first input pin (P1). When the first input pin (P1) is at a high level, the normally open contact of the branch line relay (K2) is energized and closed, the second output pin (J2) outputs a high level, the normally open contact of the auxiliary relay (K3) coil is energized and closed, and the branch line circuit is connected;

[0025] 3) Determine the state of the second input pin (P2). When the second input pin (P2) is at a high level, the first output pin (J1) outputs a first alarm signal and the timer starts timing. When the second input pin (P2) is at a low level, the first output pin (J1) outputs a second alarm signal.

[0026] Furthermore, when the timer counts down below the preset connection time limit, the first output pin (J1) outputs a low level and stops the alarm;

[0027] When the timer exceeds the preset connection time limit, the branch controller (C) controls the second output pin (J2) to output a low level, forcibly disconnecting the branch resistor (R) from the high-voltage line network, and the first output pin (J1) outputs a second alarm signal, while detecting the state of the first input pin (P1).

[0028] If the first input pin (P1) remains in a high level state, the first output pin (J1) continues to output the second alarm signal;

[0029] If the state of the first input pin (P1) is low level, the first output pin (J1) outputs low level and stops the alarm.

[0030] Furthermore, when the branch switch (K1) is closed, if the input of the second input pin (P2) is at a high level, the branch controller (C) determines that the branch relay (K2) is stuck, and then times the time through a timer. If the input of the second input pin (P2) is still at a high level after exceeding a first preset time, the branch controller (C) outputs a low level through the second output pin (J2), forcibly disconnecting the branch resistor (R) from the high-voltage line network, and stops outputting a third alarm signal through the first output pin (J1) after a second preset time.

[0031] Furthermore, after the auxiliary relay (K3) is closed, if the input of the second input pin (P2) is at a low level, the branch line controller (C) controls the auxiliary relay (K3) to be disconnected after a delay of a third preset time;

[0032] If it is detected that the first input pin (P1) drops from a high level to a low level within a third preset time, the timing is restarted.

[0033] Furthermore, the preset connection time limit is 20s;

[0034] The first preset time is 5s;

[0035] The second preset time is 1 minute;

[0036] The third preset time is 20s;

[0037] The frequency of the first alarm signal is greater than the frequency of the second alarm signal, and the frequency of the second alarm signal is greater than the frequency of the third alarm signal.

[0038] The beneficial effects achieved by the present invention compared to the prior art are:

[0039] 1) The present invention provides a dual-source trolleybus line splitting system and line splitting method. By adding a line splitting controller, an auxiliary relay, and a current sensor, the state of the line splitting switch can be monitored in real time, the conduction time of the line splitting relay can be calculated, the on-off of the line splitting circuit can be controlled, and the alarm bell can be sounded, thereby avoiding the phenomenon of heating and smoking of the line splitting resistor, and can effectively solve the problem of the line splitting relay sticking, which makes it impossible to split the line.

[0040] 2) The present invention provides a dual-source trolleybus line splitting system and line splitting method, which reduces the requirements on the driver's driving ability and improves the vehicle traffic efficiency.

[0041] 3) The present invention provides a dual-source trolleybus line splitting system and line splitting method, which adopts intelligent line splitting monitoring technology to improve the success rate of line splitting, while avoiding the burning of line splitting resistors due to adhesion in traditional vehicles, thereby reducing economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of the branching system in the prior art.

[0043] Figure 2 This is a structural diagram of the line distribution system provided by the present invention.

[0044] Figure 3 This is a flow chart of the steps of the line separation method provided by the present invention.

[0045] Figure 4 This is a flow chart of the steps of the first level protection function implemented by the line splitting method of the present invention.

[0046] Figure 5 This is a flow chart of the steps of implementing the second level protection function of the line splitting method of the present invention.

[0047] Figure 6 This is a flow chart of the steps of implementing the third level protection function of the line splitting method of the present invention. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] [First embodiment]

[0052] like Figure 2 The figure shows a dual-source trolleybus branching system provided by the first embodiment of the present invention, including a branching resistor R. The branching resistor R is connected to the high-voltage line network via a branching relay K2 to form a branching loop. A branching switch K1 is also provided in the high-voltage line network.

[0053] The difference between this embodiment and the prior art is that:

[0054] A secondary relay K3 and a current sensor SI are connected in series between the branch resistor R and the branch relay K2. In this embodiment, the secondary relay K3's primary functions include closing its own branch switch, turning on the secondary relay K3 and, in the event of an anomaly, forcibly disconnecting the branch resistor R from the high-voltage power line. For example, if the branch relay K2 becomes stuck or the driver misoperates, the second output pin J2 is driven low. The current sensor SI's primary function includes real-time branch current detection and inputting the acquired current value to the branch controller C via the second input pin P2.

[0055] The first input pin P1 of the branch line controller C is connected to the high-voltage power line network, the second input pin P2 is connected to the current sensor SI, the first output pin J1 is connected to the alarm bell Q, and the second output pin J2 is connected to the auxiliary relay K3. In this embodiment, the branch line controller's main functions include: detecting branch line current, performing calculations and processing, controlling the auxiliary relay K3, detecting branch line signals, and detecting and issuing an alarm for sticking conditions in the branch line relay K2.

[0056] In this embodiment, if Figure 2 As shown, the branch line controller C detects the state of the branch line switch in real time through the first input pin P1. When the branch line switch K1 is pressed, the signal of the first input pin P1 changes from a low level to a high level, which can be expressed as jumping from P1=0 to P1=1; when the branch line switch K1 is reset, the signal of the first input pin P1 changes from a high level to a low level, which can be expressed as jumping from P1=1 to P1=0.

[0057] In this embodiment, if Figure 2 As shown, the branch controller C receives the signal fed back by the current sensor SI in real time through the second input pin P2. When the value flowing through the current sensor SI is greater than the preset reference current, the input of the second input pin P2 is a high level, which can be expressed as P2=1 at this time; when the value flowing through the current sensor SI is less than the preset reference current, the input of the second input pin P2 is a low level, which can be expressed as P2=0 at this time.

[0058] In this embodiment, when the alarm bell Q needs to work, the branch line controller C outputs a high level through the first output pin J1, which is represented by J1=1 at this time; when the alarm bell Q does not need to work, the branch line controller C outputs a low level through the first output pin J1, which is represented by J1=0 at this time.

[0059] like Figure 2 As shown, when the auxiliary relay K3 coil needs to be closed, the branch line controller C outputs a high level through the second output pin J2, which is represented by J2=1 at this time; when the auxiliary relay K3 coil does not need to be closed, the branch line controller C outputs a low level through the second output pin J2, which is represented by J2=0 at this time.

[0060] [Second embodiment]

[0061] like Figure 3-6 As shown, the second embodiment of the present invention also provides a line splitting method of a dual-source trolleybus line splitting system, comprising the following steps: Figure 3-4 As shown,

[0062] 1) The branch controller initializes the system and resets the system parameters;

[0063] 2) Determine the state of the first input pin P1. When the first input pin P1 is at a high level, the branch line relay K2 is energized and the normally open contact is closed. The second output pin J2 outputs a high level, the auxiliary relay K3 coil is energized and the normally open contact is closed, and the branch line circuit is turned on.

[0064] 3) Determine the state of the second input pin P2. When the second input pin P2 is at a high level, the first output pin J1 outputs a first alarm signal. At this time, the line splitting function is normally realized, and the timer starts timing. When the second input pin P2 is at a low level, the first output pin J1 outputs a second alarm signal. In this embodiment, the frequency of the second alarm signal is selected to be lower than the frequency of the first alarm signal to distinguish it from the first alarm signal. For example, the second alarm signal selects an alarm signal with a frequency of 1 Hz.

[0065] In order to prevent the branch resistor R from overheating, generating too much heat, and losing too much energy, the upper limit of the connection time between the branch resistor R and the high-voltage line network can be controlled under the premise of ensuring the normal branch function. The preset upper limit of the connection time is 20 seconds, that is, the branch time is no more than 20 seconds, and the operator's branch operation time is less than 20 seconds; therefore,

[0066] When the timer counts down below the preset connection time limit, the first output pin J1 outputs a low level and stops the alarm;

[0067] When the timer exceeds the preset connection time limit, the branch controller C controls the second output pin J2 to output a low level, forcibly disconnecting the branch resistor R from the high-voltage line network, and the first output pin J1 outputs a second alarm signal. At the same time, the state of the first input pin P1 is detected.

[0068] If the first input pin P1 remains in a high level state, the first output pin J1 continues to output the second alarm signal;

[0069] If the state of the first input pin P1 is low level, the first output pin J1 outputs low level and stops the alarm.

[0070] This is the first level of protection provided by this embodiment. That is, when the branch switch K1 is stuck or the operator does not close the branch switch K1, the branch controller C controls the auxiliary relay K3 to be forcibly disconnected, and an alarm is sounded through the alarm bell Q, thereby avoiding the phenomenon of the branch resistor heating and smoking. It can effectively solve the problem of the branch relay sticking, which makes it impossible to branch.

[0071] The second protection function provided by this embodiment is: when the branch relay K2 is stuck, Figure 3 and 5As shown, the branch switch K1 is closed. At this time, the first input pin P1 jumps to a low level, which is represented by P1 = 0. If the current value fed back by the current sensor SI is not 0 at this time, that is, the input of the second input pin P2 is a high level, which is represented by P2 = 1, the branch controller C determines that the branch relay K2 has been stuck. Then, through the timer, if the input of the second input pin P2 is still a high level after exceeding the first preset time, the branch controller C outputs a low level through the second output pin J2, forcibly disconnecting the branch resistor R from the high-voltage line network, and outputs a third alarm signal through the first output pin J1 after the second preset time. In this embodiment, the first preset time is selected as 5s, the second preset time is selected as 1min, and the frequency of the third alarm signal is selected to be lower than the frequency of the second alarm signal to distinguish it from the second alarm signal. For example, the third alarm signal can be an alarm signal with a frequency of 1 / 3Hz.

[0072] If the branch relay K2 becomes stuck, if it remains energized, the branch resistor R will be constantly exposed to high voltage, which can easily cause it to overheat and burn out, resulting in the failure of the dual-source bus to be forced to lower the pole and branch. In this embodiment, if the branch relay K2 becomes stuck, an alarm will be sounded through the alarm bell Q. The branch controller C will then control the auxiliary relay K3 to complete the branching operation, protecting the branch resistor R without affecting the normal branching of the trolleybus.

[0073] The third level of protection provided by this embodiment is to protect the contacts of the auxiliary relay K3. In order to protect the auxiliary relay K3 added in this embodiment, avoid frequent closing or opening of the contacts. The specific method is as follows: Figure 3 and 6 As shown, after the auxiliary relay K3 is closed, if the input of the second input pin P2 is low, the branch line controller C controls the auxiliary relay K3 to delay disconnection for a third preset time. If the first input pin P1 drops from a high level to a low level within the third preset time, the timer is reset. When the input of the first input pin P1 is low and the input of the second input pin P2 is low, indicating P1 = 0 and P2 = 0, the system is in the straight driving state. In this embodiment, the third preset time is 20 seconds.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference signs in the claims should not be construed as further limiting the scope of the invention.

Claims

1. A branching method for a dual-source trolleybus branching system, the branching system comprising a branching resistor (R), wherein the branching resistor (R) is connected to a high-voltage line network via a branching relay (K2) to form a branching loop, and a branching switch (K1) connected to a branching controller (C) is further provided; A secondary relay (K3) and a current sensor (SI) are also connected in series between the branch resistor (R) and the branch relay (K2); The first input pin (P1) of the branch line controller (C) is connected to the high-voltage line network, the second input pin (P2) is connected to the current sensor (SI), the first output pin (J1) is connected to the alarm bell (Q), and the second output pin (J2) is connected to the auxiliary relay (K3); The line splitting method comprises the following steps: 1) The branch controller initializes the system and resets the system parameters; 2) Determine the state of the first input pin (P1). When the first input pin (P1) is at a high level, the normally open contact of the branch line relay (K2) is energized and closed, the second output pin (J2) outputs a high level, the normally open contact of the auxiliary relay (K3) coil is energized and closed, and the branch line circuit is connected; 3) judging the state of the second input pin (P2); when the second input pin (P2) is at a high level, the first output pin (J1) outputs a first alarm signal and the timer starts timing; when the second input pin (P2) is at a low level, the first output pin (J1) outputs a second alarm signal; Its characteristics are: When the timer counts down below the preset connection time limit, the first output pin (J1) outputs a low level and stops the alarm; When the timer exceeds the preset connection time limit, the branch line controller (C) controls the second output pin (J2) to output a low level, forcibly disconnecting the branch line resistor (R) from the high-voltage line network, and the first output pin (J1) outputs a second alarm signal, while detecting the state of the first input pin (P1). If the first input pin (P1) remains in a high level state, the first output pin (J1) continues to output the second alarm signal; If the state of the first input pin (P1) is low level, the first output pin (J1) outputs low level and stops the alarm.

2. The line splitting method of a dual-source trolleybus line splitting system according to claim 1, characterized in that: The branch line controller (C) detects the state of the branch line switch in real time through the first input pin (P1). When the branch switch (K1) is pressed, the signal of the first input pin (P1) changes from low level to high level; When the branching switch (K1) is reset, the signal of the first input pin (P1) changes from a high level to a low level.

3. The line splitting method of a dual-source trolleybus line splitting system according to claim 1, characterized in that: The branch controller (C) receives the feedback signal from the current sensor (SI) in real time through the second input pin (P2). When the value flowing through the current sensor (SI) is greater than the preset reference current, the second input pin (P2) input is a high level; When the value flowing through the current sensor (SI) is less than a preset reference current, the second input pin (P2) input is a low level.

4. The line splitting method of a dual-source trolleybus line splitting system according to claim 1, characterized in that: When the alarm bell (Q) is required to work, the branch line controller (C) outputs a high level through the first output pin (J1); When the alarm bell (Q) is not required to work, the branch line controller (C) outputs a low level through the first output pin (J1).

5. The line splitting method of a dual-source trolleybus line splitting system according to claim 1, characterized in that: When the coil of the auxiliary relay (K3) needs to be closed, the branch controller (C) outputs a high level through the second output pin (J2); When the auxiliary relay (K3) coil is not required to be closed, the branch line controller (C) outputs a low level through the second output pin (J2).

6. The line splitting method of a dual-source trolleybus line splitting system according to claim 1, characterized in that: When the branch switch (K1) is closed, if the input of the second input pin (P2) is at a high level, the branch controller (C) determines that the branch relay (K2) is stuck, and then counts by a timer. If the input of the second input pin (P2) is still at a high level after exceeding a first preset time, the branch controller (C) outputs a low level through the second output pin (J2), forcibly disconnecting the branch resistor (R) from the high-voltage line network, and outputs a third alarm signal through the first output pin (J1) for a second preset time and then stops.

7. A line splitting method for a dual-source trolleybus line splitting system according to claim 6, characterized in that: After the auxiliary relay (K3) is closed, if the input of the second input pin (P2) is at a low level, the branch line controller (C) controls the auxiliary relay (K3) to disconnect after a delay of a third preset time; if the first input pin (P1) is detected to drop from a high level to a low level within the third preset time, the timing is restarted.

8. A line splitting method for a dual-source trolleybus line splitting system according to claim 7, characterized in that: The preset connection time limit is 20s; The first preset time is 5s; The second preset time is 1 minute; The third preset time is 20s; The frequency of the first alarm signal is greater than the frequency of the second alarm signal, and the frequency of the second alarm signal is greater than the frequency of the third alarm signal.

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