System and method for regenerating a catalytic particulate filter located in a diesel engine exhaust line

Abstract

A system for regenerating a catalytic particulate filter located in a diesel engine exhaust line, including an electronic control unit, a controlled fuel injector arranged upstream of the catalytic particulate filer and supplied with fuel by a controlled pump, and a sensor for measuring the fuel supply pressure of the injector. The system further detects a defect in the activating state of the pump based on the fuel supply pressure of the injector.

1 - 12 . (canceled) 
     
     
         13 . A system for regenerating a catalytic particulate filter located in an exhaust line of a diesel engine, comprising:
 an electronic control unit;   a controlled fuel injector located upstream of the catalytic particulate filter and supplied with fuel by a controlled pump;   a sensor that measures pressure at which fuel is supplied to the injector; and   detection means for detecting a fault with a state of activation of the pump based on the pressure at which fuel is supplied to the injector.   
     
     
         14 . The system as claimed in  claim 13 , in which the detection means comprises first comparison means for comparing the pressure at which fuel is supplied to the injector against a first threshold pressure. 
     
     
         15 . The system as claimed in  claim 14 , in which the detection means comprises second comparison means for comparing a respective value of first system operating parameters against first predetermined values. 
     
     
         16 . The system as claimed in  claim 15 , in which the detection means further detects an inactivity fault with the pump when, for a period of time at least equal to a first predetermined period of time, the pressure at which fuel is supplied to the injector exceeds the first threshold pressure and the first parameters have adopted the respective first predetermined values. 
     
     
         17 . The system as claimed in  claim 15 , in which the detection means comprises third comparison means for comparing the pressure at which fuel is supplied to the injector against a second threshold pressure. 
     
     
         18 . The system as claimed in  claim 17 , in which the detection means comprises fourth comparison means for comparing the respective value of second system operating parameters against second predetermined values. 
     
     
         19 . The system as claimed in  claim 18 , in which the detection means further detects an activity fault with the pump when, for a period of time at least equal to a second predetermined period of time, the pressure at which the injector is supplied with fuel is below the second threshold pressure, and the second parameters have adopted the respective second predetermined values. 
     
     
         20 . The system as claimed in  claim 15 , in which the first parameters comprise information representing a state of demand for activation of the pump, information representing a state of stabilization of the pressure at which fuel is supplied to the injector, information representing a state of operation of the sensor that measures the pressure at which fuel is supplied to the injector, information representing a state of operation of the pump, and information representing a state of operation of the injector. 
     
     
         21 . The system as claimed in  claim 18 , in which the second parameters comprise information representing a state of demand for activation of the pump, information representing a state of operation of the sensor that measures the pressure at which fuel is supplied to the injector, information representing a state of operation of the pump, and information representing a state of operation of the injector. 
     
     
         22 . The system as claimed in  claim 15 , in which the first predetermined values respectively represent absence of a demand to activate the pump, a stabilized pressure, absence of a fault with the operation of the sensor that measures the pressure at which fuel is supplied to the injector, absence of a fault with the operation of the pump, and absence of a fault with the operation of the injector. 
     
     
         23 . The system as claimed in  claim 18 , in which the second predetermined values respectively represent a demand to activate the pump, absence of a fault with the operation of the sensor that measures the pressure at which fuel is supplied to the injector, absence of a fault with the operation of the pump, and absence of a fault with the operation of the injector. 
     
     
         24 . A method for regenerating a catalytic particulate filter located in an exhaust line of a diesel engine, comprising:
 detecting a fault with a state of activation of a controlled pump based on pressure at which fuel is supplied to a controlled fuel injector positioned upstream of the catalytic particulate filter and supplied with fuel by the pump.