System For Managing A Reagent Dispensing Device In An Exhaust Line

Abstract

The invention relates to a system for managing a reagent dispensing device in the exhaust line of an engine, said circuit including a tank ( 1 ), an injection means ( 3 ), a means for conditioning the reagent, sensors capable of determining the representative parameters of the condition of the dispensing circuit and of the reagent, and actuators for controlling the conditioning and injection means driven by a calculation unit based on the condition of the dispensing circuit and of the reagent and on the engine parameters determined by an engine control unit ( 5 ) characterised in that the calculation unit is integrated in the engine control unit ( 5 ) and in that the system includes an analog/digital interface ( 4 ) for processing the analog signals from the sensors ( 2 ) and the actuators ( 3, 7, 8, 9 ), provided in the vicinity of the tank ( 1 ) and connected to the engine control unit by a multiplexed digital link.

1 . A system for controlling a reagent dispensing circuit in an exhaust line of an engine, said circuit comprising a reservoir, injection means, reagent conditioning means, sensors suitable for determining parameters representing the status of the dispensing circuit and of the reagent, and command actuators for the conditioning means and the injection means; the command actuators being controlled by a control unit in response to the status of the dispensing circuit and of the reagent and engine parameters as determined by an engine control module; wherein the control unit is integrated in the engine control module and in that the system comprises a digital/analog interface adapted to process the analog signals from sensors and actuators; the control unit being mounted in the proximity of reservoir and connected to the engine control module by a multiplexed digital connection. 
   
   
       2 . The system according to  claim 1 , wherein said connection is dedicated to the reagent dispensing circuit. 
   
   
       3 . The system according to  claim 1 , wherein said multiplexed digital connection is a CAN network. 
   
   
       4 . The system according to  claim 1  wherein said reagent is a NOx reducing agent. 
   
   
       5 . The system according to  claim 1  wherein said system comprises at least one temperature sensor for the reagent in the reservoir. 
   
   
       6 . The system according to  claim 1  wherein the reagent conditioning means comprises a heating means. 
   
   
       7 . An automotive vehicle comprising an engine installed in the engine compartment and a control system according to  claim 1 , wherein the reagent reservoir is installed inside of, or in the proximity of, the trunk of the vehicle.