Methods and systems for fault diagnosis

Abstract

The present disclosure relates to a control system and methods implemented on the control system. The control system includes a tuning/detuning system and a diagnosis system. The tuning/detuning system includes a first voltage source, a second voltage source, one or more coil arrays, and one or more tuning/detuning circuit drivers corresponding to the one or more coils arrays, respectively. The diagnosis system includes a first current sampling circuit and a processor. The first current sampling circuit is configured to obtain a first current. The processor is configured to diagnose the tuning/detuning system based on the first current.

1 - 20 . (canceled) 
     
     
         21 . A control system comprising:
 a tuning/detuning system including a first voltage source, a second voltage source, and one or more tuning/detuning circuit drivers; and   a diagnosis system including a first current sampling circuit and a processor, wherein:
 the first current sampling circuit includes a first analog-to-digital converter (ADC), a first operational amplifier, and a first sampling resistor, 
 the processor is configured to diagnose the tuning/detuning system. 
   
     
     
         22 . The control system of  claim 21 , wherein:
 the first ADC is electrically connected to the first operational amplifier,   the first operational amplifier is electrically connected to the first sampling resistor,   the first sampling resistor is electrically connected to the first voltage source in series.   
     
     
         23 . The control system of  claim 21 , wherein the tuning/detuning system includes one or more coil arrays corresponding to the one or more tuning/detuning circuit drivers, for each of the one or more coil arrays,
 the coil array includes one or more first diodes; and   the one or more first diodes determines a tuning or detuning status of the coil array.   
     
     
         24 . The control system of  claim 21 , wherein
 the first voltage source, including a first output end, is configured to provide a power supply that outputs a constant current; and   the second voltage source, including a second output end, is configured to output a constant negative voltage.   
     
     
         25 . The control system of  claim 23 , wherein for each of the one or more tuning/detuning circuit drivers, the tuning/detuning circuit includes a first input end, a second input end, a third output end, and a first control end;
 the first input end, electrically connected to the first output end of the first voltage source, serves as a positive power supply input port and is configured to output the constant current;   the second input end, electrically connected to the second output end of the second voltage source, serves as a negative power supply input port and is configured to output the constant negative voltage; and   the third output end, electrically connected to a corresponding coil array, is configured to output the constant current or the constant negative voltage that determines a conduction status of the one or more first diodes of the corresponding coil array.   
     
     
         26 . The control system of claim  41 , wherein:
 the first current sampling circuit is configured to obtain a first current outputted by the first voltage source; and   the processor is configured to diagnose the tuning/detuning system based on the first current.   
     
     
         27 . The control system of  claim 26 , wherein:
 the diagnosis circuit system includes a first switch module and one or more dummy loads corresponding to the one or more tuning/detuning circuit drivers, wherein:
 each dummy load of the one or more dummy loads, including one or more second diodes, is electrically connected to a corresponding tuning/detuning circuit in parallel, 
 the one or more dummy loads are electrically connected to a common connecting end in parallel, 
 the first switch module is electrically connected to ground, electrically connected to the common connecting end, and operatively connected to the processor, and 
 the processor is configured to cause the first switch module to turn on or turn off, and to diagnose the tuning/detuning system based on the first current. 
   
     
     
         28 . The control system of  claim 27 , wherein
 the diagnosis circuit system includes a second current sampling circuit, wherein the second current sampling circuit, operatively connected to the processor, is configured to obtain a second current of the common connecting end, and   the processor is configured to diagnose the tuning/detuning system based on the second current.   
     
     
         29 . The control system of  claim 28 , wherein the second current sampling circuit includes a second ADC, a second operational amplifier, and a second resistor, wherein:
 the second ADC is electrically connected to the second operational amplifier in series and operatively connected to the processor,   the second operational amplifier is electrically connected to the second resistor in parallel, and   the second resistor is electrically connected to the first switch module in series and electrically connected to at least one of the one or more dummy loads in series.   
     
     
         30 . The control system of  claim 21 , wherein:
 the diagnosis circuit system includes a third resistor, a second switch module, and a voltage comparison circuit, wherein:
 the third resistor is electrically connected to the second switch module in parallel, 
 a first end of the third resistor is electrically connected to the second voltage source, 
 a second end of the third resistor is electrically connected to at least one of the one or more tuning/detuning circuit drivers, 
 the voltage comparison circuit is electrically connected to the second end of the third resistor and operatively connected to the processor, 
 the voltage comparison circuit is configured to obtain a first voltage of the second end of the third resistor and compare the first voltage with a reference voltage, and 
 the processor is configured to diagnose the tuning/detuning system 
   based on the comparison between the first voltage and the reference voltage.   
     
     
         31 . The control system of  claim 30 , wherein:
 the diagnosis circuit system includes a third switch module, wherein the third switch module is electrically connected to the second voltage source in series, electrically connected to the third resistor in series, and operatively connected to the processor; and   the processor is configured to cause the third switch module to turn on or turn off.   
     
     
         32 . The control system of  claim 24 , wherein:
 the first voltage source includes a DC-DC controller, a fourth resistor, and a variable resistor, wherein:
 the DC-DC controller is electrically connected to the first output end of the first voltage source though an output end of the DC-DC controller, 
 the fourth resistor is electrically connected to ground and electrically connected to the DC-DC controller through a feedback input of the DC-DC controller, 
 the variable resistor is electrically connected to the fourth resistor, electrically connected to the first output end of the first voltage source, and operatively connected to the processor, and 
 the processor is configured to cause an equivalent resistance value of the variable resistor to change. 
   
     
     
         33 . A method, implemented on the control system including a tuning/detuning system including a first voltage source, a second voltage source, one or more coil arrays, and one or more tuning/detuning circuit drivers; and a diagnosis system, the method comprising:
 upon a detection that a radio frequency system is idle and the one or more coil arrays are electrically disconnected from the radio frequency system, making the second voltage source as the voltage source of the one or more tuning/detuning circuit drivers and determining a second expected value of a first voltage;   determining an actual value of the first voltage; and   determining whether the actual value of the first voltage is greater than the second expected value of the first voltage.   
     
     
         34 . The method of  claim 33 , further comprising:
 determining that the actual value of the first voltage is greater than the second expected value of the first voltage; and   in response to a determination that the actual value of the first voltage is greater than the second expected value of the first voltage, determining that no short circuit exists in the one or more tuning/detuning circuit drivers.   
     
     
         35 . The method of  claim 33 , further comprising:
 determining that the actual value of the first voltage is not greater than the second expected value of the first voltage; and   in response to a determination that the actual value of the first voltage is not greater than the second expected value of the first voltage, determining that a short circuit exists in at least one of the one or more tuning/detuning circuit drivers.   
     
     
         36 . The method of  claim 33 , further comprising:
 changing a type of the voltage source of one of the one or more tuning/detuning circuit drivers to the first voltage source;   determining a second actual value of a first current outputted by the first voltage source; and   determining whether the second actual value of the first current increases by a predetermined increment.   
     
     
         37 . The method of  claim 36 , further comprising:
 determining that the second actual value of the first current fails to increase by the predetermined increment; and   in response to a determination that the second actual value of the first current fails to increase by the predetermined increment, determining that an open circuit exists in the one or more tuning/detuning circuit drivers.   
     
     
         38 . The method of  claim 36 , further comprising:
 determining that the second actual value of the first current increases by the predetermined increment;   in response to a determination that the second actual value of the first current increases by the predetermined increment, determining an actual value of a second current obtained by the diagnosis circuit system; and   determining whether the actual value of the second current increases by the predetermined increment.   
     
     
         39 . The method of  claim 38 , further comprising:
 determining that the actual value of the second current increases by the predetermined increment; and   in response to a determination that the actual value of the second current increases by the predetermined increment, determining that no short circuit exists at the third output end of the tuning/detuning circuit driver.   
     
     
         40 . A method, implemented on a control system including a tuning/detuning system including a first voltage source, a second voltage source, one or more coil arrays, and one or more tuning/detuning circuit drivers; and a diagnosis system, the method comprising:
 upon a detection that the first voltage source as a voltage source of the one or more tuning/detuning circuit drivers, determining an output voltage of the first voltage source according to configurations of the one or more coil arrays;   determining an expected value of an electrical signal according to at least one of an operation status of a radio frequency system, a tuning or detuning status of the one or more coil arrays, and types of voltage sources of the one or more tuning/detuning circuit drivers;   determining an actual value of the electrical signal; and   performing fault diagnosis on the tuning/detuning system based on the expected value of the electrical signal and the actual value of the electrical signal.