Switch monitoring and railway line management

Abstract

A switch monitoring method and a switch monitoring system, a railway line management method and a railway line management system are provided. Electric signal of a switch motor during pulling of the switch can effectively reflect status of the switch, when the switch is in a stable state, electric signal of its motor is very steady during pulling of a switch of the switch; however, when the switch is in an unstable state, there will be different degrees of fluctuation in electric signal of its motor during pulling of the switch. Thus, the invention may be used to identify state of a switch by monitoring electric signal of a switch motor ( 201,203,205 ), and further take different measures based on different states of the switch ( 401,403,405 ). With these measures, accidents due to switch failure may be effectively reduced, and train delay time may also be reduced through proper line management.

1 . A switch monitoring method, comprising:
 monitoring an electric signal for a switch motor;   acquiring a switch state identification threshold; and   identifying a state of the switch based on the electric signal and the switch state identification threshold.   
     
     
         2 . The method according to  claim 1 , wherein the electric signal is one of the following electric signals: a voltage value of a circuit where the switch motor locates, and a current value of a circuit where the switch motor locates. 
     
     
         3 . The method according to  claim 1 , wherein acquiring the switch state identification threshold further comprises:
 determining the switch state identification threshold based on a fluctuation degree of an electric signal of the same type of switch motor under a plurality of different states.   
     
     
         4 . The method according to  claim 3 , wherein the state of the switch is divided into three phases: (i) the switch in a first phase is in a stable operating state, (ii) the switch in a second phase is in a relatively unstable operating state, and (iii) the switch in a third phase is in a very unstable operating state,
 wherein a fluctuation degree of the electric signal of the switch motor in the second phase is higher than that in the first phase; and   wherein a fluctuation degree of the electric signal of the switch motor in the third phase is higher than that in the second phase.   
     
     
         5 . The method according to  claim 1 , wherein identifying the state of the switch further comprises:
 determining an average value of the monitored electric signal of the switch motor as a current average value;   determining a variance between a value of the monitored electric signal of the switch motor and the current average value as a first variance;   determining a variance between a value of the monitored electric signal of the switch motor and an average value of the electric signal of same type of switch motor in a stable operating state as a second variance;   determining a fluctuation degree of the electric signal of the switch motor based on the first variance and the second variance; and   comparing the fluctuation degree of the electric signal of the switch motor and the switch state identification threshold to identify the state of the switch.   
     
     
         6 . The method according to  claim 1 , wherein identifying the state of the switch further comprises:
 determining a kernel density function of the electric signal of the same type of switch motor in a stable operating state as a first kernel density function P;   determining a kernel density function of the electric signal of the switch motor as a second kernel density function Q;   determining a distance that the second kernel density function Q deviates from the first kernel density function P; and   comparing the distance and the switch state identification threshold to identify the state of the switch.   
     
     
         7 . The method according to  claim 1 , wherein a line management method comprises:
 deciding whether to adjust a pulling plan of the switch based on the state of the switch; and   adjusting the pulling plan of the switch in response to a need of adjusting the pulling plan of the switch.   
     
     
         8 . The method according to  claim 7 , wherein adjusting the pulling plan of the switch further comprises:
 adjusting the pulling plan of the switch based on a delay tolerance degree of a train timetable.   
     
     
         9 . A switch monitoring system, comprising:
 a monitoring means configured to monitor an electric signal of a switch motor;   an acquiring means configured to acquire a switch state identification threshold; and   an identifying means configured to identify a state of the switch based on the electric signal and the switch state identification threshold.   
     
     
         10 . The system according to  claim 9 , wherein the electric signal is one of the following electric signals: voltage value of a circuit where the switch motor locates, and current value of a circuit where the switch motor locates. 
     
     
         11 . The system according to  claim 9 , wherein the acquiring means further comprises:
 a first determining means configured to determine the switch state identification threshold based on a fluctuation degree of electric signal of the same type of the switch motor under different states.   
     
     
         12 . The system according to  claim 11 , wherein state of the switch is divided into three phases: (i) the switch in a first phase is in a stable operating state, (ii) the switch in a second phase is in a relatively unstable operating state, and (iii) the switch in a third phase is in a very unstable operating state.
 wherein the fluctuation degree of the electric signal of the switch motor in the second phase is higher than that in the first phase; and   wherein the fluctuation degree of the electric signal of the switch motor in the third phase is higher than that in the second phase.   
     
     
         13 . The system according to  claim 9 , wherein the identifying means further comprises:
 a second determining means configured to determine an average value of the monitored electric signal of the switch motor as a current average value;   a third determining means configured to determine a variance between a value of the monitored electric signal of the switch motor and the current average value as a first variance;   a fourth determining means configured to determine a variance between a value of the monitored electric signal of the switch motor and an average value of the electric signal of the same type of switch motor in a stable operating state as a second variance;   a fifth determining means configured to determine a fluctuation degree of the electric signal of the switch motor based on the first variance and the second variance; and   a first comparing means configured to compare the fluctuation degree of the electric signal of the switch motor and the switch state identification threshold to identify the state of the switch.   
     
     
         14 . The system according to  claim 9 , wherein the identifying means further comprises:
 a sixth determining means configured to determine a kernel density function of the electric signal of the same type of switch motor in a stable operating state as a first kernel density function P;   a seventh determining means configured to determine a kernel density function of the electric signal of the switch motor as a second kernel density function Q;   an eighth determining means configured to determine a distance that the second kernel density function Q deviates from the first kernel density function P; and   a second comparing means configured to compare the distance and the switch state identification threshold to identify the state of the switch.   
     
     
         15 . The system according to  claim 9 , wherein a line management system, comprises:
 a deciding means configured to decide whether to adjust a pulling plan of the switch based on a state of the switch; and   an adjusting means configured to adjust the pulling plan of the switch in response to a need of adjusting the pulling plan of the switch.   
     
     
         16 . The system according to  claim 15 , wherein the adjusting means is further configured to adjust the pulling plan of the switch based on delay tolerance degree of a train timetable. 
     
     
         17 . A computer readable non-transitory article of manufacture tangibly embodying computer readable instructions which, when executed, cause a computer to carry out the steps of a method comprising:
 monitoring an electric signal for a switch motor;   acquiring a switch state identification threshold; and   identifying a state of the switch based on the electric signal and the switch state identification threshold.