Methods and Systems for Performing Diagnostic Processes with Reduced Processing Time

Abstract

Operation for performing diagnostics, such as vehicle diagnostics including short circuit and low impedance diagnostics during a high-voltage (HV) battery pre-charging a power-net of the vehicle and including insulation resistance monitoring diagnostics for measuring an insulation resistance between the power-net and another power-net, with reduced processing time includes measuring a physical parameter (voltage or current signal) as the parameter is being generated by a device-under-test to which the diagnostic process pertains. The diagnostic process requires a stable value of the parameter. The parameter variates while being generated during a beginning time and is stable while being generated during an ending time. While the parameter is being generated during the beginning time, a stable value of the parameter which the parameter will have during the ending time is predicted. The stable value of the parameter is predicted based on variation of measured values of the parameter during the beginning time.

1 - 14 . (canceled) 
     
     
         15 . A system for a vehicle having a battery, a high-voltage (HV) power-net, and a low-voltage (LV) power-net, the system comprising:
 a controller configured to perform an insulation resistance monitoring diagnostics process, for measuring an insulation resistance between the HV power-net and the LV power-net, with reduced processing time;   a sensor configured to measure an electrical parameter generated between the HV power-net and the LV power-net during the insulation monitoring resistance diagnostics process, wherein the insulation resistance monitoring diagnostic process requires a stable value of the electrical parameter, wherein the electrical parameter variates while being generated during a beginning of a cycle and is stable while being generated during an ending of the cycle;   the controller being in communication with the sensor and being further configured to perform the insulation resistance monitoring diagnostics process by (i) predicting, while the electrical parameter is being generated during the beginning of the cycle, a stable value of the electrical parameter which the electrical parameter will have at a given time during the end of the cycle, the controller predicting the stable value of the electrical parameter based on variation of measured values of the electrical parameter during the beginning of the cycle, and by (ii) detecting a value of the insulation resistance based on a stable value of the electrical parameter; and   the controller further configured to perform a control action depending on the value of the insulation resistance.   
     
     
         16 . The system of  claim 15  wherein:
 the controller is further configured to cause the vehicle to be immobilized upon the value of the insulation resistance being low. 
 
     
     
         17 . The system of  claim 15  wherein:
 the controller is further configured to cause a HV battery of the vehicle to be disconnected from the HV power-net upon the value of the insulation resistance being low. 
 
     
     
         18 . The system of  claim 15  wherein:
 the electrical parameter is a voltage signal. 
 
     
     
         19 . The system of  claim 15  wherein:
 the controller is further configured to obtain, from the sensor, measured values of the electrical parameter at a first pair of time instants of a first time segment during the beginning of the cycle and measured values of the electrical parameter at a second pair of time instants of a succeeding second time segment during the beginning of the cycle; and 
 wherein the controller predicts the stable value of the electrical parameter based on (i) a first slope for the first time segment dependent on the measured values of the electrical parameter at the first pair of time instants and (ii) a second slope for the second time segment dependent on the measured values of the electrical parameter at the second pair of time instants. 
 
     
     
         20 . The system of  claim 15  wherein:
 the controller is further configured to obtain, from the sensor, measured values of the electrical parameter at three or more time instants of a first time segment during the beginning of the cycle and measured values of the electrical parameter at three or more time instants of a succeeding second time segment during the beginning of the cycle; and 
 wherein the controller is further configured to predict the stable value of the electrical parameter based on (i) a first slope for the first time segment dependent on the measured values of the electrical parameter at the three or more time instants and (ii) a second slope for the second time segment dependent on the measured values of the electrical parameter at the three or more time instants.