Traction motor bearing temperature monitoring alert control method, system and related device

Abstract

A traction motor bearing temperature monitoring alert control method. Said method not only uses the temperature as the basis for determining a bearing fault of the traction motor, but also takes into account other determination criterions that may generally exist when the bearing of the traction motor fails, effectively determining the actual state of the bearing in a multi-angle and multi-event combination manner, and formulates, according to more comprehensive monitoring parameters, more stringent fault levels and speed limit standards for corresponding levels, guaranteeing the safe and reliable operation of the train. Also disclosed are a traction motor bearing temperature monitoring alert control system, a device, and a computer readable storage medium, which have the beneficial effects above.

Description

Traction motor shaft temperature monitoring alarm control method, system and related device

[0001] The present application claims priority to the Chinese patent application No. 201711384552.7, filed on December 20, 2017, and entitled "Traction motor shaft temperature monitoring alarm control method, system and related device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of traction motor fault monitoring, and in particular to a traction motor shaft temperature monitoring alarm control method, system, device and computer readable storage medium. BACKGROUND

[0003] With the increase of the speed of the EMU train, the impact, dynamic effect and vibration of the train on the rail increase, and the safety requirement of the train rotating parts is higher. The traction motor is a key rotating part of the EMU train, which is generally installed on the train bogie and is crucial to the safety of the high-speed running of the train. When the bearing is worn or has defects, it will affect the safety of the train operation.

[0004] The traditional traction motor bearing monitoring system only monitors the bearing temperature, monitors and alarms the EMU train according to the bearing temperature limit value, and is divided into two levels of alarm. First level alarm: bearing temperature T> 120℃, speed limit 200km / h; second level alarm: bearing temperature T> 140℃, speed limit 140km / h. The monitoring and alarm method is relatively simple, which cannot effectively ensure the safe operation of the EMU train, and the bearing damage state is not accurate by simply judging the temperature. In the case of high bearing damage degree, the maximum speed limit level is 140km / h, which still has a safety hazard to the train operation, and the alarm level needs to be further improved to further reduce the speed.

[0005] Therefore, how to overcome the technical defects of the traditional bearing detection method and develop a bearing temperature monitoring alarm control method with more comprehensive fault detection and more accurate traction motor actual state determination is a problem to be solved by those skilled in the art.

[0006] SUMMARY

[0007] The purpose of the present application is to provide a traction motor shaft temperature monitoring alarm control method, which not only uses temperature as a criterion for traction motor bearing failure, but also combines other judgment basis that may exist when the traction motor bearing fails, effectively judges the actual state of the bearing through multi-angle and multi-event combination, and develops more rigorous fault levels and speed limit standards under the corresponding levels according to more comprehensive monitoring parameters, to ensure the safe and reliable operation of the train.

[0008] Another object of the present application is to provide a traction motor shaft temperature monitoring and alarm control system, device and computer readable storage medium.

[0009] To achieve the above object, the present application provides a traction motor shaft temperature monitoring and alarm control method, which comprises the following steps:

[0010] obtaining real-time bearing temperature from a shaft temperature sensor of a traction motor and other fault information of the traction motor; wherein the other fault information comprises shaft speed sensor fault information and traction motor grounding fault information;

[0011] when the shaft temperature sensor is not disabled due to failure, determining whether the real-time bearing temperature exceeds a first temperature threshold;

[0012] if the real-time bearing temperature exceeds the first temperature threshold, determining whether the real-time bearing temperature exceeds a second temperature threshold or whether the other fault information occurs;

[0013] if the real-time bearing temperature does not exceed the second temperature threshold and none of the other fault information occurs, limiting the maximum running speed of the train to a first speed threshold, and controlling the inverter device and cooling fan in the traction converter to enter a traction motor protection mode;

[0014] if only the real-time bearing temperature exceeds the second temperature threshold or only one of the other fault information occurs, limiting the maximum running speed to a second speed threshold, and controlling the inverter device and the cooling fan to enter the traction motor protection mode;

[0015] if the real-time bearing temperature exceeds the second temperature threshold and one of the other fault information occurs, limiting the maximum running speed to a third speed threshold, and controlling the inverter device and the cooling fan to enter the traction motor protection mode;

[0016] wherein the inverter device in the traction motor protection mode is in a no-torque output state, and the cooling fan is in a high-speed cooling mode to protect the traction motor, and the first speed threshold > the second speed threshold > the third speed threshold.

[0017] Optionally, the method further comprises:

[0018] when the shaft temperature sensor is disabled due to failure, generating and sending a fault code through a preset path.

[0019] Optionally, the method further comprises:

[0020] determining whether the real-time bearing temperature has exceeded the first temperature threshold before the fault code is obtained;

[0021] If yes, the highest running speed is limited to a second speed threshold value, and the inverter device and the cooling fan are controlled to enter the traction motor protection mode.

[0022] Optionally, the method further comprises:

[0023] determining whether the real-time bearing temperature before the fault code is acquired has exceeded the second temperature threshold value;

[0024] If yes, the highest running speed is limited to a third speed threshold value, and the inverter device and the cooling fan are controlled to enter the traction motor protection mode.

[0025] Optionally, the method further comprises:

[0026] determining whether only one of the other fault information appears on the basis of the fault code being acquired;

[0027] If yes, the highest running speed is limited to a third speed threshold value, and the inverter device and the cooling fan are controlled to enter the traction motor protection mode.

[0028] Optionally, the method further comprises:

[0029] determining whether the speed difference between the actual running speed of the train and the first speed threshold value exceeds a difference threshold value when the highest running speed is limited to the first speed threshold value;

[0030] If yes, full braking is applied to the train after a preset time interval.

[0031] Optionally, the method further comprises:

[0032] determining whether the speed difference between the actual running speed of the train and the second speed threshold value or the third speed threshold value exceeds the difference threshold value when the highest running speed is limited to the second speed threshold value or the third speed threshold value;

[0033] If yes, the full braking is immediately applied to the train.

[0034] To achieve the above-mentioned purpose, the application further provides a traction motor shaft temperature monitoring and alarm control system, which comprises:

[0035] a shaft temperature and other fault information acquisition unit, configured to acquire a real-time bearing temperature from a shaft temperature sensor of a traction motor and other fault information of the traction motor; wherein the other fault information comprises shaft speed sensor fault information and traction motor grounding fault information;

[0036] a first fault judging unit, configured to judge whether the real-time bearing temperature exceeds a first temperature threshold when the shaft temperature sensor is not disabled due to a fault;

[0037] a second fault judging unit, configured to judge whether the real-time bearing temperature exceeds a second temperature threshold or whether the other fault information occurs when the real-time bearing temperature exceeds the first temperature threshold;

[0038] a first processing unit, configured to limit a maximum running speed of the train to a first speed threshold and control an inverter device in a traction converter and a cooling fan to enter a traction motor protection mode when the real-time bearing temperature does not exceed the second temperature threshold and none of the other fault information occurs;

[0039] a second processing unit, configured to limit the maximum running speed to a second speed threshold and control the inverter device and the cooling fan to enter the traction motor protection mode when only the real-time bearing temperature exceeds the second temperature threshold or only one of the other fault information occurs;

[0040] a third processing unit, configured to limit the maximum running speed to a third speed threshold and control the inverter device and the cooling fan to enter the traction motor protection mode when the real-time bearing temperature exceeds the second temperature threshold and one of the other fault information occurs;

[0041] wherein the inverter device in the traction motor protection mode is in a no torque output state and the cooling fan is in a high-speed cooling mode to protect the traction motor, and the first speed threshold > the second speed threshold > the third speed threshold.

[0042] To achieve the above object, the present application further provides a traction motor shaft temperature monitoring and alarm control device, which comprises:

[0043] a memory, configured to store a computer program;

[0044] a processor, configured to execute the computer program to realize the steps of the traction motor shaft temperature monitoring and alarm control method as described above.

[0045] To achieve the above object, the present application further provides a computer readable storage medium, which has a computer program stored thereon, and the computer program is executed by a processor to realize the steps of the traction motor shaft temperature monitoring and alarm control method as described above.

[0046] Obviously, the technical scheme provided in the application uses not only temperature as the criterion for judging the failure of the traction motor bearing, but also other judgment bases that usually exist when the traction motor bearing fails, effectively judges the actual state of the bearing through multi-angle and multi-event combination, formulates more rigorous failure grades and speed limit standards under the corresponding grades according to more comprehensive monitoring parameters, and guarantees the safe and reliable operation of the train. The application also provides a traction motor shaft temperature monitoring and alarm control system, device and computer readable storage medium, which have the above beneficial effects, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0048] Fig. 1 is a flowchart of a traction motor shaft temperature monitoring and alarm control method provided by an embodiment of the present application;

[0049] Fig. 2 is a flowchart of a control mode when the shaft temperature sensor fails in the traction motor shaft temperature monitoring and alarm control method provided by an embodiment of the present application;

[0050] Fig. 3 is a flowchart of a processing mode when the speed difference is greater than the difference threshold in the traction motor shaft temperature monitoring and alarm control method provided by an embodiment of the present application;

[0051] Fig. 4 is a structural block diagram of a traction motor shaft temperature monitoring and alarm control system provided by an embodiment of the present application;

[0052] Fig. 5 is a schematic diagram of alarm diagnosis logic of an actual traction motor shaft temperature monitoring and alarm control system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] The core of the present application is to provide a traction motor shaft temperature monitoring and alarm control method, system, device and computer readable storage medium. The method uses not only temperature as the criterion for judging the failure of the traction motor bearing, but also other judgment bases that usually exist when the traction motor bearing fails, effectively judges the actual state of the bearing through multi-angle and multi-event combination, formulates more rigorous failure grades and speed limit standards under the corresponding grades according to more comprehensive monitoring parameters, and guarantees the safe and reliable operation of the train.

[0054] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0055] The following is in combination with FIG. 1, which is a flowchart of a traction motor shaft temperature monitoring and alarm control method provided by an embodiment of the present application.

[0056] Specifically, the method comprises the following steps:

[0057] S101: obtaining real-time bearing temperature from a shaft temperature sensor of a traction motor and other fault information of the traction motor; wherein the other fault information comprises shaft speed sensor fault information and traction motor grounding fault information;

[0058] The traction motor is internally provided with two bearings, namely a driving end bearing (connected to one side of a gear box) and a non-driving end bearing, which support the rotor to rotate at high speed. The two bearings are in a high-speed rotating state during train operation, regardless of whether there is traction force output. Temperature sensors are arranged near the driving end bearing and the non-driving end bearing, for monitoring the temperature of the two bearings of the traction motor. A Hall type speed sensor is arranged at the tail end of the traction motor, for measuring the rotational speed of the traction motor. Under normal circumstances, when the bearing of the traction motor is damaged, the temperature of the bearing will first rise rapidly, and as the damage further expands, the rotational movement of the stator of the traction motor may appear eccentric, which is prone to the following two problems: first, traction motor grounding fault caused by contact between the rotor and the stator; second, speed sensor fault caused by contact between the speed sensor and the speed measuring gear. At the same time, the temperature sensor for measuring the shaft temperature may also be abnormal due to various reasons, and cannot feedback the real shaft temperature of the traction motor. As an important parameter for evaluating the fault state of the traction motor, if the effective shaft temperature parameter cannot be obtained, the traction motor cannot be accurately evaluated and can be considered to be in a worst state according to the actual situation.

[0059] Of course, the information that can be fed back under the traction motor fault condition can also be appropriately increased due to the difference of the functional components arranged, and can be a fault feedback parameter of the corresponding traction motor, which is not specifically limited here and can be specifically analyzed and selected according to the actual situation.

[0060] Specifically, according to the above description, the traction motor bearing fault monitoring events can be summarized as follows:

[0061] Event 1: the temperature sensor for measuring the bearing temperature fails;

[0062] Event 2: the temperature sensor is normal, and the measured real-time bearing temperature exceeds a first temperature threshold value;

[0063] Event 3: the temperature sensor is normal, and the measured real-time bearing temperature exceeds not only the first temperature threshold value but also a second temperature threshold value, wherein the first temperature threshold value is less than the second temperature threshold value;

[0064] Event 4: a traction motor grounding fault due to contact between the rotor and the stator or a speed sensor fault due to contact between the speed sensor and the speed measuring gear.

[0065] After Event 1 occurs, it means that the bearing will lose temperature monitoring; the occurrence of Event 2 and Event 3 represents that the bearing may have occurred a slight abnormality due to abnormal temperature rise; the occurrence of Event 4 represents that the bearing damage has developed to the extent of secondary events, meaning that the bearing has occurred a more serious structural damage. The first temperature threshold value and the second temperature threshold value can be two representative temperatures, meaning that at this temperature, abnormal phenomena are likely to occur, of course, according to different actual situations, more temperature threshold values can also be set in a ladder form for more fine reflection of the real state of the traction motor bearing.

[0066] The above four events are monitored and diagnosed in real time by the controller, and in subsequent steps and embodiments, the occurrence and sequence of the four events are reasonably combined to match the corresponding bearing monitoring alarm level under different conditions.

[0067] S102: when the shaft temperature sensor does not fail due to failure, it is determined whether the real-time bearing temperature exceeds a first temperature threshold value;

[0068] On the basis of S101, this step is based on the premise that the shaft temperature sensor is not failed, and is aimed at comparing the measured real-time bearing temperature with the first temperature threshold value to determine whether the first temperature threshold value is exceeded.

[0069] Of course, there will also be a situation that the shaft temperature sensor fails due to failure, in which case it is impossible to obtain a reliable real-time bearing temperature, so another way of judging the degree of traction motor failure is needed, which will be described in detail in other examples.

[0070] S103: no operation is performed;

[0071] The step is based on the result of S102 that the real-time bearing temperature is less than the first temperature threshold, i.e. no operation is needed because the bearing temperature of the traction motor is normal when it is less than the first temperature threshold.

[0072] S104: judging whether the real-time bearing temperature exceeds the second temperature threshold or whether any of the other fault information occurs;

[0073] The step is based on the result of S102 that the real-time bearing temperature is greater than the first temperature threshold, aiming to judge whether the real-time bearing temperature also exceeds the second temperature threshold or whether any of the other fault information occurs in succession on the basis of being greater than the first temperature threshold. In S101, it is mentioned that the other fault information includes the traction motor grounding fault information caused by the contact between the rotor and the stator and the speed sensor fault information caused by the contact between the speed sensor and the speed measuring gear.

[0074] In other words, the step can specifically judge the following scenarios: first, the real-time bearing temperature is greater than the first temperature threshold but less than the second temperature threshold, and none of the other fault information occurs; second, the real-time bearing temperature is greater than the first temperature threshold and also greater than the second temperature threshold, and none of the other fault information occurs; third, the real-time bearing temperature is greater than the first temperature threshold but less than the second temperature threshold, and any of the other fault information occurs; fourth, the real-time bearing temperature is greater than the first temperature threshold and also greater than the second temperature threshold, and any of the other fault information occurs on this basis. Different handling methods corresponding to different situations will be described in subsequent steps.

[0075] S105: when the real-time bearing temperature does not exceed the second temperature threshold and no other fault information occurs, limiting the maximum running speed of the train to the first speed threshold, and controlling the inverter device in the traction converter and the cooling fan to enter the traction motor protection mode;

[0076] The step corresponds to the first situation described in S104, i.e. the real-time bearing temperature is greater than the first temperature threshold but less than the second temperature threshold, and none of the other fault information occurs. Since the shaft temperature sensor is effective, the shaft temperature only exceeds the relatively low first temperature threshold, and none of the other fault information occurs, it is considered that the traction motor under this condition has a slight abnormality, and the corresponding train control means under the slight abnormality condition is set, i.e. limiting the maximum running speed of the train to the first speed threshold, and controlling the inverter device in the traction converter and the cooling fan to enter the traction motor protection mode.

[0077] The inverter device in the traction motor protection mode is in a no torque output state, and the cooling fan is in a high speed cooling mode to protect the traction motor.

[0078] S106: When only the real-time bearing temperature exceeds the second temperature threshold or any of the other fault information occurs, the maximum running speed is limited to the second speed threshold, and the inverter device and the cooling fan are controlled to enter the traction motor protection mode;

[0079] This step corresponds to the second and third situations described in S104, i.e., the real-time bearing temperature is greater than the first temperature threshold and also greater than the second temperature threshold, and none of the other fault information occurs; the real-time bearing temperature is greater than the first temperature threshold but less than the second temperature threshold, and any of the other fault information occurs.

[0080] Since the shaft temperature sensor is effective, the real-time bearing temperature in the second situation exceeds the relatively high second temperature threshold, and the real-time bearing temperature in the third situation does not exceed the relatively high second temperature threshold but any of the other fault information occurs, it is considered that the traction motor in this case is in an ordinary abnormality, and the corresponding train control means in the ordinary abnormality is set, i.e., the maximum running speed of the train is limited to the second speed threshold, and the inverter device and the cooling fan in the traction converter are controlled to enter the traction motor protection mode. The second speed threshold should be less than the first speed threshold, and the specific degree that should be less than the first speed threshold can be flexibly set according to the actual situation, which is not specifically limited here.

[0081] S107: When the real-time bearing temperature exceeds the second temperature threshold and any of the other fault information occurs, the maximum running speed is limited to the third speed threshold, and the inverter device and the cooling fan are controlled to enter the traction motor protection mode.

[0082] This step corresponds to the fourth situation described in S104, i.e., the real-time bearing temperature is greater than the first temperature threshold and also greater than the second temperature threshold, and any of the other fault information occurs. Since the shaft temperature sensor is effective, the real-time bearing temperature in the second situation exceeds the relatively high second temperature threshold, and any of the other fault information occurs at the same time, it is considered that the traction motor in this case is in a serious abnormality, and the corresponding train control means in the serious abnormality is set, i.e., the maximum running speed of the train is limited to the third speed threshold, and the inverter device and the cooling fan in the traction converter are controlled to enter the traction motor protection mode. The third speed threshold should be less than the second speed threshold, and the specific degree that should be less than the second speed threshold can be flexibly set according to the actual situation, which is not specifically limited here.

[0083] Further, since the possibility of the traction motor grounding fault exists in the three cases included in the two steps of S106 and S107, the inverter device needs to be blocked when the traction motor grounding fault occurs, and the inverter device can be set to be no torque output when the traction motor grounding fault does not occur. Meanwhile, the cooling fan of the traction motor usually only has two working modes, a low-speed mode and a high-speed mode, and obviously, the cooling and protection effect of the cooling fan in the high-speed mode is better.

[0084] Further, in the three cases corresponding to S105, S106 and S107, the highest running speed of the train is set to be a first speed threshold, a second speed threshold and a third speed threshold respectively. Although the speed threshold is set, since the actual running speed of the train when the corresponding level fault occurs is unknown, the train needs to be braked at a suitable time when the actual running speed of the train is obviously greater than the set speed threshold to ensure the safety of passengers and the train.

[0085] Based on the above technical solution, the traction motor shaft temperature monitoring and alarm control method provided by the embodiment of the present application not only uses temperature as a criterion for traction motor bearing failure, but also combines other judgment bases that usually exist when the traction motor bearing fails, effectively judges the actual state of the bearing through multi-angle and multi-event combination, formulates more rigorous fault levels and speed limit standards under the corresponding levels according to more comprehensive monitoring parameters, and ensures the safe and reliable operation of the train.

[0086] The following is in combination with FIG. 2, which is a flow chart of the control method when the shaft temperature sensor fails in the traction motor shaft temperature monitoring and alarm control method provided by the embodiment of the present application.

[0087] It specifically includes the following steps:

[0088] S201: When the shaft temperature sensor fails due to failure, generate and send a fault code through a preset path;

[0089] The fault code generated and sent in this step is intended to remind and indicate that the shaft temperature sensor has failed. Sometimes, the shaft temperature sensor also has a flash failure caused by interference, which will recover to normal in a short time. If the condition is met, the generated fault code can be cleared.

[0090] S202: Determine whether the real-time bearing temperature before the fault code is obtained has exceeded a first temperature threshold;

[0091] S203: Determine whether only one of the other fault information occurs;

[0092] The step is based on the result of S202 that the real-time bearing temperature before the fault code is acquired has not exceeded the first temperature threshold, that is, the situation that the shaft temperature sensor is failed due to the fault is known at the beginning, and whether any one of other fault information appears is determined.

[0093] S204: determining whether the real-time bearing temperature before the fault code is acquired has exceeded the second temperature threshold.

[0094] The step is based on the result of S202 that the real-time bearing temperature before the fault code is acquired has exceeded the first temperature threshold, and whether the real-time bearing temperature before the fault code is acquired has exceeded the second temperature threshold higher than the first temperature threshold is determined.

[0095] S205: limiting the maximum driving speed to the second speed threshold, and controlling the inverter and the cooling fan to enter the traction motor protection mode.

[0096] The step is based on the result of S204 that the real-time bearing temperature before the fault code is acquired has exceeded the first temperature threshold but has not exceeded the second temperature threshold, that is, the real-time bearing temperature is obtained through the normal shaft temperature sensor, and the information that the real-time bearing temperature only exceeds the first temperature threshold but does not exceed the second temperature threshold is obtained, and the fault code reflecting the failure of the shaft temperature sensor is received in the subsequent process.

[0097] At this time, the maximum driving speed is limited to the second speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode, which corresponds to the ordinary abnormal level. For related content, refer to the control measures matched with the ordinary abnormal level in S106.

[0098] S206: limiting the maximum driving speed to the third speed threshold, and controlling the inverter and the cooling fan to enter the traction motor protection mode.

[0099] The step corresponds to two determination results: one is based on the result of S204 that the real-time bearing temperature before the fault code is acquired has exceeded the first temperature threshold and has also exceeded the second temperature threshold, that is, the real-time bearing temperature is obtained through the normal shaft temperature sensor, and the information that the real-time bearing temperature not only exceeds the first temperature threshold but also exceeds the second temperature threshold is obtained, and the fault code reflecting the failure of the shaft temperature sensor is received in the subsequent process; the other is based on the result of S203 that the shaft temperature sensor is failed due to the fault at the beginning, and only any one of other fault information appears.

[0100] The first case should correspond to the serious abnormal level, while the second case cannot measure the reliable real-time bearing temperature in the failure case, and cannot perform the relatively rigorous state analysis, so in this case, if one of the other fault information also appears, it should also be judged as the serious abnormal level, and the corresponding control measures are matched, that is, the highest driving speed is limited to the third speed threshold, and the inverter device and cooling fan are controlled to enter the traction motor protection mode. For related content, see the control measures matched in the serious abnormal level in S107.

[0101] S207: No operation is performed;

[0102] This step is based on the judgment result of S203 that the real-time bearing temperature before the fault code is obtained does not exceed the first temperature threshold, that is, on the basis of the information that the real-time bearing temperature has been obtained through the normal shaft temperature sensor and the real-time bearing temperature does not exceed the first temperature threshold, the fault code reflecting the failure of the shaft temperature sensor is received in the subsequent process. Since the real-time bearing temperature does not exceed the first temperature threshold previously, no operation needs to be performed.

[0103] The following is in combination with FIG. 3, which is a flow chart of one processing mode when the speed difference value is greater than the difference value threshold in the traction motor shaft temperature monitoring and alarm control method provided by the embodiment of the application.

[0104] It specifically includes the following steps:

[0105] S301: When the real-time bearing temperature does not exceed the second temperature threshold and no other fault information appears, limit the highest driving speed of the train to the first speed threshold, and control the inverter device and cooling fan in the traction converter to enter the traction motor protection mode;

[0106] S302: Judge whether the speed difference value between the actual driving speed of the train and the first speed threshold exceeds the difference value threshold;

[0107] S303: Apply full braking to the train after a preset time interval;

[0108] This step is based on the judgment result of S302 that the speed difference value exceeds the difference value threshold, and full braking is applied to the train after a preset time interval.

[0109] S304: Control the train to continue driving at the first speed threshold.

[0110] This step is based on the judgment result of S302 that the speed difference value does not exceed the difference value threshold, and directly controls the train to continue driving at the first speed threshold.

[0111] Further, another similar scenario is as follows:

[0112] When the maximum running speed is limited to the second speed threshold or the third speed threshold, it is judged whether the speed difference between the actual running speed of the train and the second speed threshold or the third speed threshold exceeds the difference threshold; if yes, full braking is immediately applied to the train. Since the possible abnormality under the ordinary abnormality level and the serious abnormality level is relatively serious, the train cannot wait for the preset time interval to apply full braking as in the slight abnormality, and in this case, full braking is directly applied to the train.

[0113] The preset time interval can be flexibly set according to actual conditions, and no specific value is given here.

[0114] Based on the above technical solution, the traction motor shaft temperature monitoring and alarm control method provided by the embodiment of the present application not only uses temperature as a criterion for traction motor bearing failure, but also combines other possible judgment bases when the traction motor bearing fails, effectively judges the actual state of the bearing through multi-angle and multi-event combination, formulates more rigorous failure levels and speed limit standards under the corresponding levels according to more comprehensive monitoring parameters, and ensures the safe and reliable operation of the train.

[0115] Because the situation is complex, it is impossible to enumerate and describe one by one, and those skilled in the art should realize that many examples can exist according to the basic method principle provided by the present application combined with actual conditions, and without paying enough creative labor, they should all be within the protection scope of the present application.

[0116] Please see FIG. 4, which is a structural block diagram of a traction motor shaft temperature monitoring and alarm control system provided by the embodiment of the present application.

[0117] The system can include:

[0118] The shaft temperature and other fault information acquisition unit 100 is used to acquire real-time bearing temperature and other fault information of the traction motor from the shaft temperature sensor of the traction motor; wherein the other fault information includes shaft speed sensor fault information and traction motor grounding fault information;

[0119] The first fault judgment unit 200 is used to judge whether the real-time bearing temperature exceeds the first temperature threshold when the shaft temperature sensor does not fail due to faults;

[0120] The second fault judgment unit 300 is used to judge whether the real-time bearing temperature exceeds the second temperature threshold or whether other fault information appears when the real-time bearing temperature exceeds the first temperature threshold;

[0121] The first processing unit 400 is configured to limit the maximum running speed of the train to a first speed threshold and control the inverter device and cooling fan in the traction converter to enter a traction motor protection mode when the real-time bearing temperature does not exceed the second temperature threshold and no other fault information occurs.

[0122] The second processing unit 500 is configured to limit the maximum running speed to a second speed threshold and control the inverter device and cooling fan to enter the traction motor protection mode when only one of the real-time bearing temperature exceeding the second temperature threshold or the other fault information occurs.

[0123] The third processing unit 600 is configured to limit the maximum running speed to a third speed threshold and control the inverter device and cooling fan to enter the traction motor protection mode when the real-time bearing temperature exceeds the second temperature threshold and one of the other fault information occurs.

[0124] In the traction motor protection mode, the inverter device is in a no-torque output state, and the cooling fan is in a high-speed cooling mode to protect the traction motor, and the first speed threshold is greater than the second speed threshold, and the second speed threshold is greater than the third speed threshold.

[0125] The above units can be applied to the following specific actual example:

[0126] The occurrence and sequence of the above four events are reasonably combined, which can be summarized as nine cases, three levels of alarms. The specific implementation is as follows:

[0127] Level 0: zero-level alarm

[0128] Case M1: axle temperature sensor failure.

[0129] Vehicle response: only diagnostic code is generated.

[0130] Level 1: first-level alarm

[0131] Case M2: the vehicle directly monitors the event T> 120℃ when there is no traction bearing monitoring related fault diagnosis.

[0132] Vehicle response: speed limit 200km / h, if the speed is too high, the full brake is automatically applied after 300s; the inverter device has no torque output; the forced motor cooling fan is in high-speed cooling.

[0133] Level 2: second-level alarm

[0134] There are three cases that can produce a second-level alarm of the vehicle, which are:

[0135] Case M3: After the bearing temperature T > 120℃ is monitored first, the bearing temperature sensor fails again. This case shows that the bearing temperature has been abnormal, reaching the first level of alarm, but it cannot continue to monitor the temperature, and needs to further upgrade the alarm level to the second level.

[0136] Case M4: After the bearing temperature T > 120℃ is monitored first, the traction motor grounding fault or motor speed sensor fault occurs again. This case shows that the bearing temperature has been abnormal, reaching the first level of alarm, but the structure may have been damaged, resulting in the eccentric rotation of the traction motor stator, contact between the rotor and the stator, or contact between the speed sensor and the speed measuring gear, which needs to further upgrade the alarm level to the second level.

[0137] Case M5: When the vehicle is monitoring the related fault diagnosis of the traction bearing, the bearing temperature T > 120℃ is monitored first, and the temperature continues to rise to T > 140℃.

[0138] Any of the above three cases will produce a second level alarm of the vehicle.

[0139] Vehicle response: speed limit 140km / h, if the speed is too high, the full brake will be automatically applied immediately; if the motor grounding inverter device is blocked, the inverter device has no torque output in other cases; the motor cooling fan is forced to high speed cooling.

[0140] Level 3: third level alarm

[0141] There are four cases that can produce a third level alarm of the vehicle, which are:

[0142] Case M6: Based on the occurrence of case M4, the traction motor bearing temperature further increases to T > 140℃. This case shows that the bearing damage is getting worse, and needs to further upgrade the alarm level to the third level.

[0143] Case M7: After the bearing temperature T > 140℃ is monitored first, the bearing temperature sensor fails again. This case shows that the bearing temperature has been abnormal, reaching the second level of alarm, but it cannot continue to monitor the temperature, and needs to further upgrade the alarm level to the third level.

[0144] Case M8: After the bearing temperature T > 140℃ is monitored first, the traction motor grounding fault or motor speed sensor fault occurs again. This case shows that the bearing temperature has been abnormal, reaching the second level of alarm, but the structure may have been damaged, resulting in the eccentric rotation of the traction motor stator, contact between the rotor and the stator, or contact between the speed sensor and the speed measuring gear, which needs to further upgrade the alarm level to the third level.

[0145] Case M9: after detecting the bearing temperature sensor fault, the traction motor ground fault or motor speed sensor fault is detected. Such a case indicates that the bearing temperature has lost monitoring, and the structure may have been damaged to a certain extent, which requires a third-level alarm and high vigilance.

[0146] Any of the above four cases will produce a vehicle third-level alarm.

[0147] Vehicle response: speed limit 40km / h, if the speed is too high, the full brake will be applied automatically; if the motor ground inverter device is blocked, the inverter device has no torque output in other cases; the motor cooling fan is forced to high-speed cooling.

[0148] According to the above nine cases, the traction motor bearing monitoring alarm levels can be classified and summarized as shown in Table 1, which corresponds to the diagnostic logic diagram of Figure 5:

[0149] Table 1 Traction motor bearing monitoring alarm level table

[0150]

[0151]

[0152] Based on the above embodiment, the application further provides a traction motor shaft temperature monitoring and alarm control device, which can include a memory and a processor, wherein the memory has a computer program, and the processor can implement the steps provided by the above embodiment when calling the computer program in the memory. Of course, the device can also include various necessary network interfaces, power supplies and other components.

[0153] The application also provides a computer readable storage medium having a computer program stored thereon, which can implement the steps provided by the above embodiment when executed by a terminal or a processor. The storage medium can include: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0154] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the related parts can be referred to the method part.

[0155] Those skilled in the art will further appreciate that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or any combination thereof. To clearly illustrate this interchangeability of hardware and software, various examples have been described herein in terms of their functionality, with reference to several examples of components and steps. Whether such functionality is implemented in hardware or software depends on the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

[0156] The principles and implementations of the present application have been described in specific examples herein, the explanations of which are only used to help understand the method and its core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0157] It should also be noted that, in the specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A method for monitoring and alarming the temperature of a traction motor shaft, characterized in that, include: The real-time bearing temperature and other fault information of the traction motor are obtained from the shaft temperature sensor of the traction motor; wherein, the other fault information includes shaft speed sensor fault information and traction motor grounding fault information. When the shaft temperature sensor does not fail due to a fault, determine whether the real-time bearing temperature exceeds the first temperature threshold. If the real-time bearing temperature exceeds the first temperature threshold, determine whether the real-time bearing temperature exceeds the second temperature threshold or whether other fault information occurs. If the real-time bearing temperature does not exceed the second temperature threshold and no other fault information appears, the maximum speed of the train is limited to the first speed threshold, and the inverter and cooling fan in the traction converter are controlled to enter the traction motor protection mode. If only the real-time bearing temperature exceeds the second temperature threshold or only one of the other fault information occurs, then the maximum driving speed is limited to the second speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode. If the real-time bearing temperature exceeds the second temperature threshold and any of the other fault information occurs, the maximum driving speed is limited to the third speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode. In the traction motor protection mode, the inverter is in a state of no torque output, and the cooling fan is in a high-speed cooling mode to protect the traction motor. The first speed threshold > the second speed threshold > the third speed threshold.

2. The method according to claim 1, characterized in that, Also includes: When the shaft temperature sensor fails due to a malfunction, a fault code is generated and sent through a preset path.

3. The method according to claim 2, characterized in that, Also includes: Determine whether the real-time bearing temperature before the fault code is obtained has exceeded the first temperature threshold. If so, the maximum driving speed is limited to the second speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode.

4. The method according to claim 2, characterized in that, Also includes: Determine whether the real-time bearing temperature before the fault code is obtained has exceeded the second temperature threshold; If so, the maximum driving speed is limited to the third speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode.

5. The method according to claim 2, characterized in that, Also includes: Based on the obtained fault code, determine whether only one of the other fault information occurs; If so, the maximum driving speed is limited to the third speed threshold, and the inverter and the cooling fan are controlled to enter the traction motor protection mode.

6. The method according to any one of claims 1 to 5, characterized in that, Also includes: When the maximum travel speed is limited to the first speed threshold, it is determined whether the difference between the actual travel speed of the train and the first speed threshold exceeds the difference threshold. If so, then full braking is applied to the train after a preset time interval.

7. The method according to claim 6, characterized in that, Also includes: When the maximum travel speed is limited to the second speed threshold or the third speed threshold, it is determined whether the difference between the actual travel speed of the train and the second speed threshold or the third speed threshold exceeds the difference threshold. If so, then immediately apply the full braking to the train.

8. A traction motor shaft temperature monitoring and alarm control system, characterized in that, include: The shaft temperature and other fault information acquisition unit is used to acquire real-time bearing temperature and other fault information of the traction motor from the shaft temperature sensor of the traction motor; wherein, the other fault information includes shaft speed sensor fault information and traction motor grounding fault information. The first fault determination unit is used to determine whether the real-time bearing temperature exceeds the first temperature threshold when the shaft temperature sensor has not failed due to a fault. The second fault determination unit is used to determine whether the real-time bearing temperature exceeds the second temperature threshold or whether other fault information occurs when the real-time bearing temperature exceeds the first temperature threshold. The first processing unit is used to limit the maximum speed of the train to a first speed threshold and control the inverter and cooling fan in the traction converter to enter the traction motor protection mode when the real-time bearing temperature does not exceed the second temperature threshold and no other fault information occurs. The second processing unit is used to limit the maximum driving speed to the second speed threshold and control the inverter and the cooling fan to enter the traction motor protection mode when only the real-time bearing temperature exceeds the second temperature threshold or only one of the other fault information occurs. The third processing unit is used to limit the maximum driving speed to a third speed threshold and control the inverter and the cooling fan to enter the traction motor protection mode when the real-time bearing temperature exceeds the second temperature threshold and any of the other fault information occurs. In the traction motor protection mode, the inverter is in a state of no torque output, and the cooling fan is in a high-speed cooling mode to protect the traction motor. The first speed threshold > the second speed threshold > the third speed threshold.

9. A traction motor shaft temperature monitoring and alarm control device, characterized in that, include: Memory, used to store computer programs; A processor is configured to execute the computer program to implement the steps of the traction motor shaft temperature monitoring and alarm control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the traction motor shaft temperature monitoring and alarm control method as described in any one of claims 1 to 7.