Dual-system degradation switching method for locomotive signal equipment

Abstract

The dual-system downgrade switching method for locomotive signal equipment solves the problem of not switching between the working system and the backup system when the decoding result of the backup system is lower than the decoding result of the working system during the use of the locomotive signal equipment, and belongs to the field of locomotive signal equipment. The system A and the system B of the present invention compare the decoding result of the current system with the decoding result of the other system to determine whether the decoding result of the current system is in the same or downgraded state. If not, the downgrade switching count cycle is increased by 1. When the downgrade switching count cycle is greater than the threshold cycle, the dynamic output power of the current system is turned off; when the dynamic output power of the working system is turned off and the dynamic output power of the backup system is turned on, the connection board switches the backup system and the working system to each other through the switching circuit, and the locomotive signal equipment outputs the safety side, ensuring driving safety.

Description

Technical Field

[0001] The invention relates to a dual-system degradation switching method for locomotive signal equipment, belonging to the field of locomotive signal equipment. Background Art

[0002] At present, when the railway train speed is below 160km / h, the locomotive onboard equipment mainly determines the ground signal display and reflects the occupied and idle status of the line by collecting different frequency information transmitted by the ground track, determines the target speed of the train, and thus controls the train operation.

[0003] Locomotive signaling equipment not only provides signals to the driver but also provides a signal source for downstream train overspeed protection equipment. Locomotive signaling equipment is a key onboard technical component of the train operation control system, ensuring driving safety, enabling automatic alarms and automatic stops on board, and improving operating efficiency.

[0004] The locomotive signaling system utilizes a "2x2-out-of-2" or "3-out-of-2" safety structure, consisting of three units: System A, System B, and a dual-system connection. System A consists of Power Board 1 and Main Board A; System B consists of Power Board 2 and Main Board B; and the dual-system connection consists of a connection board. Systems A and B are functionally identical and independent, with only dynamic switching communication between the two systems. Main Board A within System A and Main Board B within System B are functionally identical. Each main board has two physically and functionally independent processing channels. Output from the main board will only be provided when the computational results of the two processing channels are consistent.

[0005] In order to realize the fault-oriented safety principle of locomotive signal equipment, when the current working system fails, the dual-system switching circuit of the connecting board will realize the conversion between the working system and the backup system.

[0006] However, in actual operation, due to inconsistent track circuit signals input from the entire system, external interference, equipment failure and other reasons, although the decoding results of both systems are valid, the decoding result of the backup system is lower than that of the working system, but the switching between the working system and the backup system is not performed, that is, the locomotive signal equipment does not perform downgrade switching output, which seriously affects driving safety. Summary of the Invention

[0007] Aiming at the problem that when locomotive signal equipment is in use, when the decoding result of the backup system is lower than that of the working system, the working system and the backup system are not switched, the present invention provides a dual-system degradation switching method for locomotive signal equipment.

[0008] A method for dual-system degradation switching of locomotive signal equipment according to the present invention comprises:

[0009] The locomotive signal equipment system A and system B each perform decoding in this cycle and collect feedback results output by the locomotive signal equipment. The decoding result of this cycle is compared with the collected feedback results. If the decoding result of this cycle is the same as the feedback result or the decoding result of this cycle is in a degraded state, the switch output of this system is kept set to 1, the count cycle of the degraded switching is cleared, and the dynamic output power of this system is kept on. Otherwise, the switch output of this system is set to 0, and the count cycle of the degraded switching is increased by 1.

[0010] When the count cycle of the degradation switching is greater than the threshold cycle and the switch value of the other system is 1, the dynamic output power supply of the system is turned off;

[0011] When the dynamic output power of the working system is turned off and the dynamic output power of the standby system is turned on, the connection board switches the standby system and the working system to each other through the switching circuit.

[0012] Preferably, the level of the locomotive signal equipment output is determined by the light color level and the speed level;

[0013] The light color levels from high to low are green, green-yellow, yellow, yellow 2 flashes, yellow 2, double yellow flashes, double yellow, red-yellow flashes, red-yellow, red; the speed levels from high to low are 110, 101, 100, 010, 001;

[0014] If the light color level or speed level of the decoded result after comparison is degraded, the system is in a degraded state.

[0015] Preferably, the method for setting the switch output includes:

[0016] One system controls the writing of a square wave of 1 or 0 into the input of a 74HC123 monostable circuit. The output of the 74HC123 monostable circuit generates a switching value after being isolated by an optocoupler. The switching value is input from the optocoupler isolation of another system and enters the 74HC573 latch circuit of another system after optocoupler isolation. The 74HC573 latch circuit of the other system outputs the switching value level of the one system.

[0017] The present invention also provides a method for dual-system degradation switching of locomotive signal equipment, the method comprising:

[0018] The locomotive signal equipment system A and system B each send the working status and decoding results of the current cycle to the record board. The record board sends the working status and decoding results of system A to system B. At the same time, the record board sends the working status and decoding results of system B to system A.

[0019] System A updates the stored data of System B in real time based on the received working status and decoding results;

[0020] System B updates the stored data of System A in real time based on the received working status and decoding results;

[0021] System A compares its own working status and decoding results with those of system B. If, under normal working conditions, system A is in the same or degraded state, the degraded switching count period of system A is reset to zero, and the dynamic output power of the system is kept on. Otherwise, the degraded switching count period of system A is incremented by 1. When the degraded switching count period exceeds the threshold period, the dynamic output power of the system is turned off.

[0022] System B compares its own working status and decoding results with those of system A. If, under normal working conditions, system B is in the same or degraded state, the degraded switching count period of system B is reset to zero, and the dynamic output power of the system is kept on. Otherwise, the degraded switching count period of system B is incremented by 1. When the degraded switching count period exceeds the threshold period, the dynamic output power of the system is turned off.

[0023] When the dynamic output power of the working system is turned off and the dynamic output power of the standby system is turned on, the connection board switches the standby system and the working system to each other through the switching circuit.

[0024] Preferably, data is transmitted between the recording board and the A system and the B system in an interrupt reception mode.

[0025] Preferably, the decoding result is carrier frequency and low frequency information, corresponding to a unique set of light colors and speed levels;

[0026] The light color levels from high to low are green, green-yellow, yellow, yellow 2 flashes, yellow 2, double yellow flashes, double yellow, red-yellow flashes, red-yellow, red; the speed levels from high to low are 110, 101, 100, 010, 001;

[0027] If the light color level or speed level of the decoded result after comparison is degraded, the system is in a degraded state.

[0028] Preferably, the main control CPU and auxiliary control CPU of system A communicate with CAN1 of the recording board via CAN1 bus, and the main control CPU and auxiliary control CPU of system B communicate with CAN2 of the recording board via CAN2 bus.

[0029] Preferably, the switching between the standby system and the working system is achieved by an automatic switching circuit or a manual switching circuit.

[0030] Preferably, the automatic switching circuit includes resistors R9-R14, a diode D1, a diode D2, diodes D9-D12, a polarity capacitor C1, a polarity capacitor C2, a double-open double-close signal relay RL1, and a double-open double-close signal relay RL2;

[0031] The double-open double-close signal relay RL1 and the double-open double-close signal relay RL2 are both implemented using the chip DS2E-S-DC24V;

[0032] One end of resistor R9 is connected to A50C, the other end of resistor R9 is connected to the anode of diode D9, the cathode of diode D9, the positive electrode of polarity capacitor C1, and pin 13 of double-open and double-close signal relay RL2 are connected at the same time;

[0033] One end of the resistor R10 is connected to AGA, and the other end of the resistor R10, the cathode of the diode D1, the cathode of the diode D10, the pin 1 of the double-open / double-close relay RL1, and the pin 11 of the double-open / double-close signal relay RL2 are connected at the same time;

[0034] One end of the resistor R11 is connected to CSAGA, the other end of the resistor R11 is connected to the anode of the diode D1, the anode of the diode D10, the negative electrode of the polarity capacitor C1 and the pin 16 of the double-open / double-close relay RL1 are connected to the -50V power supply;

[0035] Pin 4 of the double-open / double-close signal relay RL1 is connected to A50C;

[0036] Pin 13 of the double-open / double-close signal relay RL1, the cathode of the diode D11, and the positive electrode of the polarity capacitor C2 are connected simultaneously;

[0037] Pin 11 of the double-open / double-close signal relay RL1, one end of the resistor R13, pin 1 of the double-open / double-close relay RL2, the cathode of the diode D2, and the cathode of the diode D12 are connected simultaneously;

[0038] Pin 8 of the double-open / double-close signal relay RL1 is connected to A50D;

[0039] The double-open double-close relay RL1 controls pins 13 and 4 of the double-open double-close signal relay RL1; one end of the resistor R12 is connected to B50C, and the other end of the resistor R12 is connected to the anode of the diode D11;

[0040] The other end of resistor R13 is connected to BGA;

[0041] One end of the resistor R14 is connected to CSBGA, the other end of the resistor R14 is connected to the anode of the diode D2, the anode of the diode D12, the cathode of the polarity capacitor C2 and the pin 16 of the double-open / double-close relay RL2 are connected to the -50V power supply;

[0042] Pin 4 of the double-open / double-close signal relay RL2 is connected to B50C;

[0043] Pin 8 of the double-open / double-close signal relay RL2 is connected to B50D; the double-open / double-close relay RL2 controls pins 13 and 4 of the double-open / double-close signal relay RL2; AGA indicates the output signal manually switched to system A; BGA indicates the output signal manually switched to system B; A50C indicates the dynamic output power supply of system A; B50C indicates the dynamic output power supply of system B; CSAGA indicates the output signal forced to work in system A; CSBGA indicates the output signal forced to work in system B, A50D indicates the confirmed dynamic output power supply of system A; B50D indicates the confirmed dynamic output power supply of system B.

[0044] Preferably, the manual switching circuit includes a button S1 and a button S2; one end of the button S1 is connected to A50V, and the other end of the button S1 is connected to AGA; one end of the button S2 is connected to B50V, and the other end of the button S2 is connected to BGA;

[0045] A50V indicates the 50V power supply provided by power board 1;

[0046] B50V indicates the 50V power supply provided by power board 2.

[0047] The beneficial effect of the present invention is that the present invention solves the problem that when the decoding result of the backup system is lower than the decoding result of the working system during the use of the locomotive signal equipment, the switching between the working system and the backup system is not performed, that is, the locomotive signal equipment does not perform downgrade switching output, thereby ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The dual-system degradation switching method of embodiment 1;

[0049] Figure 2 It is the principle of setting the switch quantity between the two systems;

[0050] Figure 3 This is a schematic diagram of the automatic switching circuit principle;

[0051] Figure 4 This is a schematic diagram of the manual switching circuit principle;

[0052] Figure 5 The communication connection method between system A and system B;

[0053] Figure 6 This is the dual-system degradation switching method of embodiment 2. DETAILED DESCRIPTION

[0054] 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 any creative efforts shall fall within the scope of protection of the present invention.

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0056] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0057] This embodiment provides a dual-system degradation switching method for locomotive signal equipment. The method performs locomotive signal decoding for the current cycle on both system A and system B, collects feedback results output by the locomotive signal equipment, compares the decoding result for the current cycle with the collected feedback results, and if the decoding result and the feedback result are the same or the decoding result is in a degradation state, then the switch output of the current system is set to 1, the degradation switching count cycle is reset to zero, and the dynamic output power supply of the current system is kept on. Otherwise, the switch output of the current system is set to 0, and the degradation switching count cycle is incremented by 1. When the degradation switching count cycle is greater than a threshold cycle and the switch value of the other system is 1, the dynamic output power supply of the current system is turned off.

[0058] When the dynamic output power of the working system is turned off and the dynamic output power of the standby system is turned on, the connection board switches the standby system and the working system to each other.

[0059] This downgrade switching method can solve the problem that when the decoding result of the backup system is lower than the decoding result of the working system during the operation of the locomotive signal equipment, the switching between the working system and the backup system is not performed, that is, the locomotive signal equipment does not perform downgrade switching output, thereby ensuring driving safety.

[0060] This embodiment provides a dual-system downgrade switching method for locomotive signaling equipment. After the systems are powered on, system A and system B each transmit their respective operating status and decoding results to a recording board via the CAN bus. The recording board receives and verifies the data from both systems and then forwards the data to system B and system A via separate CAN buses. System A and system B each compare their respective operating status and decoding results with the received decoding results of the other system to determine whether, under normal operating conditions, system A or B is in a degraded state. If so, the dynamic output power of the other system is shut down. The connecting board locks or downgrades the switching via a dual-system switching circuit based on the dynamic output power of systems A and B and the current operating system. This downgrade implementation method can address the issue of locomotive signaling equipment not switching between the working and backup systems when the decoding result of the backup system is lower than that of the working system due to factors such as inconsistent track circuit signals input from the system, thereby ensuring driving safety.

[0061] Example 1:

[0062] like Figure 1 As shown, system A is powered on and performs normal decoding, collects feedback from the device output, and compares the decoding light color and speed level results of system A in this cycle with the collected light color and speed level feedback results of the device output. If the decoding result and the feedback result are the same or in a degraded state, the degraded switching count cycle is cleared and the dynamic output power of system A is kept on. If the decoding result is compared with the feedback result and is in an upgraded state, the switching output of system A is set to 0, and the degraded switching count cycle is increased by 1. When the degraded switching count cycle is greater than the threshold cycle and the switching value of system B is 1, the dynamic output power of system A is turned off.

[0063] At the same time, system B is powered on and performs normal decoding, collects feedback from the device output, and compares the decoding light color and speed level results of system B in this cycle with the light color and speed level feedback results collected from the device output. If the decoding result and the feedback result are the same or in a degraded state, the switch output of system B is set to 1, the degraded switching count cycle is cleared, and the dynamic output power of system B is kept on; if the decoding result is compared with the feedback result and is in an upgraded state, the switch output of system B is set to 0, the degraded switching count cycle is increased by 1, and when the degraded switching count cycle is greater than the threshold cycle and the switch value of system A is 1, the dynamic output power of system B is turned off;

[0064] Among them, the output levels of locomotive signal equipment are L (green), LU (green and yellow), U (yellow), U2S (yellow 2 flashes), U2 (yellow 2), UUS (double yellow flashes), UU (double yellow), HUS (red and yellow flashes), HU (red and yellow), and H (red). Since the same light color has different speed levels, the speed levels are SD1, SD2, and SD3 (110, 101, 100, 010, and 001) from high to low. Therefore, the judgment of downgrade needs to be determined by both the light color and the speed level. For example, the speed level of L3 is 110, the speed level of L2 is 101, and the speed level of L is 001. The signal output level L3>L2>L, that is, L3 to L2 or L is a downgrade, and L to L2 or L3 is an upgrade.

[0065] The method for determining degradation is to compare the light color information and speed level information of the decoding result and the feedback result, and meet the light color and speed level requirements in the locomotive signal input information and output signal table of "Locomotive Signal On-board System Equipment" (TB / T 3287-2013).

[0066] like Figure 2 As shown in the figure, the method for setting the switch quantity between the two systems is that one system controls the writing of a square wave to the input end of the 74HC123 monostable circuit, and the output end is isolated by an optocoupler to generate a switch quantity. The switch quantity is connected to the optocoupler input of the other system, and the optocoupler output of the other system is connected to the input of the 74HC573 latch circuit of the other system. The other system obtains the switch quantity level by reading the output end of the 74HC573 latch circuit. That is, one system outputs high and low levels to the other system through the dynamically controlled switch quantity.

[0067] The connection board confirms and locks the dynamic output power of systems A and B. This function is mutually exclusive, meaning only one system can be active while the other is standby. Because the active system's dynamic output power is confirmed by the connection board, its output is the final system output. However, since the standby system's dynamic output power is not confirmed by the connection board, its output is not the final system output.

[0068] The connection board implements the lock or degradation switching method based on the dynamic output power of systems A and B and the current working system:

[0069] (1) System A is the working system, and system B is the backup system

[0070] If the dynamic power supply of system A is turned off and the dynamic power supply of system B is turned on, the dual-system switching circuit of the connection board switches the working system to system B, and system A becomes the backup system.

[0071] If the dynamic power supply is turned on in system A and the dynamic power supply is turned off or on in system B, the switching circuit of the connection board will not operate.

[0072] (2) System A is the backup system, and system B is the working system

[0073] If system A turns off the dynamic power supply or turns on the dynamic power supply, and system B turns on the dynamic power supply, the dual-channel switching circuit of the connection board will not operate.

[0074] If system A turns on the dynamic power supply and system B turns off the dynamic power supply, the dual-system switching circuit of the connection board will switch the working system to system A, and system B will become the backup system.

[0075] The dual-system switching circuit of the connection board can be realized by automatic switching circuit or manual switching circuit:

[0076] Both system A's dynamic output power A50C and system B's dynamic output power B50C are input into the dual-system monitoring and switching circuit. This circuit has a "first-come, first-served" function: the system that receives dynamic output power first becomes the active system, while the other system becomes the standby system. The dual-system monitoring and switching circuit only returns the confirmed dynamic output power 50D to the active system. Specifically, when system A is the active system, A50D is returned to system A; when system B is the active system, B50D is returned to system B. Furthermore, when the active system's dynamic output power is turned off, the standby system automatically becomes the active system. This automatic switching circuit allows the tester to force a system to become the active system, or the tester can manually select the active system by pressing the "Select System A / System B" button.

[0077] like Figure 3 As shown,

[0078] The automatic switching circuit includes resistors R9-R14, diode D1, diode D2, diode D9-D12, polarity capacitor C1, polarity capacitor C2, double-open double-close signal relay RL1 and double-open double-close signal relay RL2; the double-open double-close signal relay RL1 and the double-open double-close signal relay RL2 are both implemented by chip DS2E-S-DC24V; one end of the resistor R9 is connected to A50C, the other end of the resistor R9 is connected to the anode of the diode D9, the cathode of the diode D9, the positive electrode of the polarity capacitor C1, and the pin 13 of the double-open double-close signal relay RL2 are connected at the same time; one end of the resistor R10 is connected to AGA, the other end of the resistor R10, the diode D9 The cathode of tube D1, the cathode of diode D10, pin 1 of double-open / double-close relay RL1, and pin 11 of double-open / double-close signal relay RL2 are connected at the same time; one end of resistor R11 is connected to CSAGA, the other end of resistor R11 is connected to the anode of diode D1, the anode of diode D10, the negative electrode of polarity capacitor C1, and pin 16 of double-open / double-close relay RL1 are connected to -50V power supply; pin 4 of double-open / double-close signal relay RL1 is connected to A50C; pin 13 of double-open / double-close signal relay RL1, the cathode of diode D11, and the positive electrode of polarity capacitor C2 are connected at the same time; pin 11 of double-open / double-close signal relay RL1, one end of resistor R13, the positive electrode of double-open / double-close signal relay RL2 are connected at the same time Pin 1 of the double-close relay RL2, the cathode of the diode D2, and the cathode of the diode D12 are connected at the same time; Pin 8 of the double-open double-close signal relay RL1 is connected to A50D; the double-open double-close relay RL1 controls pins 13 and 4 of the double-open double-close signal relay RL1; one end of the resistor R12 is connected to B50C, and the other end of the resistor R12 is connected to the anode of the diode D11; the other end of the resistor R13 is connected to BGA; one end of the resistor R14 is connected to CSBGA, and the other end of the resistor R14 is connected to the anode of the diode D2; the anode of the diode D12, the negative electrode of the polarity capacitor C2, and pin 16 of the double-open double-close relay RL2 are connected to a -50V power supply; the double-open double-close signal Pin 4 of relay RL2 is connected to B50C; Pin 8 of double-open / double-close signal relay RL2 is connected to B50D; double-open / double-close relay RL2 controls pins 13 and 4 of double-open / double-close signal relay RL2; AGA indicates the output signal manually switched to system A; BGA indicates the output signal manually switched to system B; A50C indicates the dynamic output power of system A; B50C indicates the dynamic output power of system B; CSAGA indicates the output signal forced to work in system A; CSBGA indicates the output signal forced to work in system B, A50D indicates the confirmed dynamic output power of system A; B50D indicates the confirmed dynamic output power of system B. Figure 3As shown, the double-open / double-close signal relay RL1 is implemented using the chip DS2E-S-DC24V. By default, pins 13 and 11 are connected, and pins 4 and 6 are connected. After pins 1 and 16 are conductive, pins 13 and 9 are connected, and pins 4 and 8 are connected. The same is true for the double-open / double-close relay RL2.

[0079] like Figure 4 As shown, the manual switching circuit includes a button S1 and a button S2; one end of the button S1 is connected to A50V, and the other end of the button S1 is connected to AGA; one end of the button S2 is connected to B50V, and the other end of the button S2 is connected to BGA;

[0080] A50V indicates the 50V power supply provided by power board 1; B50V indicates the 50V power supply provided by power board 2.

[0081] Example 2:

[0082] like Figure 6 As shown, (1) system A sends the working status and decoding results of the system to the recording board via the CAN bus; at the same time, system B sends the working status and decoding results of the system to the recording board via the CAN bus;

[0083] The recording board receives data from system A and system B through interrupt reception. After the data is verified, it forwards the data from system A to system B and the data from system B to system A through different CAN buses.

[0084] System A receives data from System B through interruption, and after verification, updates the data of System B stored at System A. At the same time, System B receives data from System A through interruption, and after verification, updates the data of System A stored at System B.

[0085] The communication connection between system A and system B is as follows Figure 5 shown.

[0086] Locomotive signaling system A consists of power board 1 and mainboard A, while system B consists of power board 2 and mainboard B. Each system mainboard includes a main control CPU 1 (referred to as the primary circuit) and an auxiliary control CPU 2 (referred to as the auxiliary circuit). The main and auxiliary circuits communicate with the recording boards CAN 1 and CAN 2, respectively, via redundant CAN buses. That is, the system A mainboard (main control CPU 1 and auxiliary control CPU 2) communicates with the recording board but not with the system B mainboard. The system B mainboard (main control CPU 1 and auxiliary control CPU 2) communicates with the recording board but not with the system A mainboard.

[0087] (2) System A compares its own working state and decoding result with the decoding result received from System B to determine whether System A is in the same or degraded state under normal working state. At the same time, System B also compares its own working state and decoding result with the decoding result received from System A to determine whether System B is in the same or degraded state under normal working state. The working state refers to whether the system is in a normal working output state. The decoding result refers to the carrier frequency and low frequency information.

[0088] Since the CAN bus transmits carrier frequency and low frequency information, and the carrier frequency and low frequency can correspond to a unique set of light colors and speed levels, the method for determining degradation is to compare the carrier frequency and low frequency of this system with the carrier frequency and low frequency transmitted by another system under normal working conditions, and meet the light color and speed level requirements in the locomotive signal input information and output signal table of "Locomotive Signal On-Board System Equipment" (TB / T 3287-2013).

[0089] Among them, the output levels of locomotive signal equipment are L (green), LU (green-yellow), U (yellow), U2S (yellow 2 flashes), U2 (yellow 2), UUS (double yellow flashes), UU (double yellow), HUS (red-yellow flashes), HU (red-yellow), and H (red). Since the same light color can have different speed levels, the speed levels are SD1, SD2, and SD3 (110, 101, 100, 010, and 001) from high to low. Therefore, the judgment of downgrade needs to be determined by both the light color and the speed level. For example, the speed level of L3 is 110, the speed level of L2 is 101, and the speed level of L is 001. The signal output level L3>L2>L, that is, L3 to L2 or L is a downgrade, and L to L2 or L3 is an upgrade.

[0090] (3) If system A is in the same or degraded state, the degraded switching count period of system A is reset to zero and the dynamic output power is kept on. Otherwise, the degraded switching count period of system A is incremented by 1. Once the period exceeds the threshold period, the dynamic output power of the system is turned off. If system B is in the same or degraded state, the degraded switching count period of system B is reset to zero and the dynamic output power is kept on. Otherwise, the degraded switching count period of system B is incremented by 1. Once the period exceeds the threshold period, the dynamic output power of the system is turned off.

[0091] The dynamic power supply is turned on by inputting a square wave into the monostable circuit.

[0092] (4) The connection board has the function of confirming and locking the dynamic output power of systems A and B. The dynamic output power of systems A and B are mutually exclusive in this function of the connection board. That is, only one system in the system can be the working system and the other system can be the backup system. Because the dynamic output power of the working system is confirmed by the connection board, its output is the final output of the system; the dynamic output power of the backup system is not confirmed by the connection board, and its output is not the final output of the system.

[0093] The connection board implements the lock or degradation switching method based on the dynamic output power of systems A and B and the current working system:

[0094] ①System A is the working system, and system B is the backup system

[0095] If the dynamic power supply of system A is turned off and the dynamic power supply of system B is turned on, the dual-system switching circuit of the connection board switches the working system to system B, and system A becomes the backup system.

[0096] If the dynamic power supply is turned on in system A and the dynamic power supply is turned off or on in system B, the switching circuit of the connection board will not operate.

[0097] ②System A is the backup system, and system B is the working system

[0098] If system A turns off the dynamic power supply or turns on the dynamic power supply, and system B turns on the dynamic power supply, the dual-channel switching circuit of the connection board will not operate.

[0099] If system A turns on the dynamic power supply and system B turns off the dynamic power supply, the dual-system switching circuit of the connection board will switch the working system to system A, and system B will become the backup system.

[0100] The dual-system switching circuit of the connection board is the same as that of Example 1.

[0101] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A dual-system downgrade switching method for locomotive signal equipment, characterized in that: The method comprises: The locomotive signal equipment system A and system B each send the working status and decoding results of the current cycle to the record board. The record board sends the working status and decoding results of system A to system B. At the same time, the record board sends the working status and decoding results of system B to system A. System A updates the stored data of System B in real time based on the received working status and decoding results; System B updates the stored data of System A in real time based on the received working status and decoding results; System A compares its own working status and decoding results with those of system B. If, under normal working conditions, system A is in the same or degraded state, the degraded switching count period of system A is reset to zero, and the dynamic output power of the system is kept on. Otherwise, the degraded switching count period of system A is incremented by 1. When the degraded switching count period exceeds the threshold period, the dynamic output power of the system is turned off. System B compares its own working status and decoding results with those of system A. If, under normal working conditions, system B is in the same or degraded state, the degraded switching count period of system B is reset to zero, and the dynamic output power of the system is kept on. Otherwise, the degraded switching count period of system B is incremented by 1. When the degraded switching count period exceeds the threshold period, the dynamic output power of the system is turned off. When the dynamic output power of the working system is turned off and the dynamic output power of the standby system is turned on, the connection board switches the standby system and the working system to each other through the switching circuit.

2. The locomotive signal equipment dual-system degradation switching method according to claim 1 is characterized in that: Data is transmitted between the recording board and system A and system B using interrupt reception mode.

3. The locomotive signal equipment dual-system degradation switching method according to claim 1, characterized in that: The decoding result is carrier frequency and low frequency information, corresponding to a unique set of light colors and speed levels; The light color levels from high to low are green, green-yellow, yellow, yellow 2 flashes, yellow 2, double yellow flashes, double yellow, red-yellow flashes, red-yellow, red; the speed levels from high to low are 110, 101, 100, 010, 001; If the light color level or speed level of the decoded result after comparison is degraded, the system is in a degraded state.

4. The locomotive signal equipment dual-system degradation switching method according to claim 1, characterized in that: The main control CPU and auxiliary control CPU of system A communicate with CAN1 of the recording board through CAN1 bus, and the main control CPU and auxiliary control CPU of system B communicate with CAN2 of the recording board through CAN2 bus.

5. The locomotive signal equipment dual-system degradation switching method according to claim 1, characterized in that: The switching between the standby system and the working system is achieved by automatic switching circuit or manual switching circuit.

6. The locomotive signal equipment dual-system degradation switching method according to claim 5, characterized in that: The automatic switching circuit includes resistors R9-R14, diode D1, diode D2, diodes D9-D12, polarity capacitor C1, polarity capacitor C2, double-open double-close signal relay RL1 and double-open double-close signal relay RL2; The double-open double-close signal relay RL1 and the double-open double-close signal relay RL2 are both implemented using the chip DS2E-S-DC24V; One end of resistor R9 is connected to A50C, the other end of resistor R9 is connected to the anode of diode D9, the cathode of diode D9, the positive electrode of polarity capacitor C1, and pin 13 of double-open and double-close signal relay RL2 are connected at the same time; One end of the resistor R10 is connected to AGA, and the other end of the resistor R10, the cathode of the diode D1, the cathode of the diode D10, the pin 1 of the double-open / double-close relay RL1, and the pin 11 of the double-open / double-close signal relay RL2 are connected at the same time; One end of the resistor R11 is connected to CSAGA, the other end of the resistor R11 is connected to the anode of the diode D1, the anode of the diode D10, the negative electrode of the polarity capacitor C1 and the pin 16 of the double-open / double-close relay RL1 are connected to the -50V power supply; Pin 4 of the double-open / double-close signal relay RL1 is connected to A50C; Pin 13 of the double-open / double-close signal relay RL1, the cathode of the diode D11, and the positive electrode of the polarity capacitor C2 are connected simultaneously; Pin 11 of the double-open / double-close signal relay RL1, one end of the resistor R13, pin 1 of the double-open / double-close relay RL2, the cathode of the diode D2, and the cathode of the diode D12 are connected simultaneously; Pin 8 of the double-open / double-close signal relay RL1 is connected to A50D; The double-open double-close relay RL1 controls pins 13 and 4 of the double-open double-close signal relay RL1; one end of the resistor R12 is connected to B50C, and the other end of the resistor R12 is connected to the anode of the diode D11; The other end of resistor R13 is connected to BGA; One end of the resistor R14 is connected to CSBGA, the other end of the resistor R14 is connected to the anode of the diode D2, the anode of the diode D12, the cathode of the polarity capacitor C2 and the pin 16 of the double-open / double-close relay RL2 are connected to the -50V power supply; Pin 4 of the double-open / double-close signal relay RL2 is connected to B50C; Pin 8 of the double-open / double-close signal relay RL2 is connected to B50D; the double-open / double-close relay RL2 controls pins 13 and 4 of the double-open / double-close signal relay RL2; AGA indicates the output signal manually switched to system A; BGA indicates the output signal manually switched to system B; A50C indicates the dynamic output power supply of system A; B50C indicates the dynamic output power supply of system B; CSAGA indicates the output signal forced to work in system A; CSBGA indicates the output signal forced to work in system B, A50D indicates the confirmed dynamic output power supply of system A; B50D indicates the confirmed dynamic output power supply of system B.

7. The locomotive signal equipment dual-system degradation switching method according to claim 5, characterized in that: The manual switching circuit includes a button S1 and a button S2; one end of the button S1 is connected to A50V, and the other end of the button S1 is connected to AGA; one end of the button S2 is connected to B50V, and the other end of the button S2 is connected to BGA; A50V indicates the 50V power supply provided by power board 1; B50V indicates the 50V power supply provided by power board 2.

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