Method pertaining to hc dosing systems and device of hc dosing systems

Abstract

A method pertaining to an HC dosing system for cleaning exhaust gases from an engine ( 150 ). A dosing unit supplies fuel to an exhaust duct ( 240 ): Determining (s 340 ) whether there is an undesired temperature level of the dosing unit. If that is found, removing (s 360 ) warmed fuel from the dosing unit ( 250 ) by supplying it to the vehicle's exhaust duct ( 240 ), entailing calculating (s 350 ) and removing an amount of fuel based on a prevailing temperature of the dosing unit ( 250 ), or removing (s 360 ) a predetermined amount in the form of substantially all of the warmed fuel of the dosing unit and transmitting it to the exhaust duct. Also computer programme product containing programme code (P) for a computer ( 200; 210 ) for implementing the method. Also to a device and a motor vehicle ( 100 ) which is equipped with the device are disclosed.

1 . A method pertaining to an HC dosing system of an engine having an exhaust duct and the engine generates exhaust gases to the exhaust duct when the engine is operating, the system being configured and operable for cleaning of exhaust gases from an engine;
 the system comprises a dosing unit to supply a fuel to said exhaust duct;   the method comprising:   determining whether there is an undesired temperature level of said dosing unit;   if said undesired temperature level is found, removing warmed fuel from said dosing unit by supplying said removed fuel to said exhaust duct; and   calculating and removing an amount of said fuel based on a prevailing temperature of said dosing unit or removing a predetermined amount comprised of substantially all of said warmed fuel of said dosing unit and transferring said removed fuel from said dosing unit to said exhaust duct.   
     
     
         2 . A method according to  claim 1 , wherein the engine ceases generating exhaust flow; and
 said determination of whether there is said undesired temperature level is done after said cessation of an exhaust flow.   
     
     
         3 . A method according to  claim 1 , further comprising continuously cooling said dosing unit by flow of said fuel to said dosing unit. 
     
     
         4 . A method according to  claim 1 , further comprising intermittently removing said fuel from said dosing unit by supplying said removed fuel to said exhaust duct. 
     
     
         5 . A method according to  claim 1 , wherein said undesired temperature level is within a predetermined range. 
     
     
         6 . A method according to  claim 1 , further comprising continuously determining a prevailing temperature of said dosing unit in order to continuously determine whether there is an undesired temperature level of said dosing unit . 
     
     
         7 . A method according to  claim 1 , further comprising removing fuel from said dosing unit by existing pressurisation of said fuel in said dosing unit. 
     
     
         8 . A method according to  claim 1 , wherein said fuel is diesel fuel or another hydrocarbon-based fuel. 
     
     
         9 . A device of an HC dosing system for cleaning of exhaust gases from an engine wherein said engine comprises a dosing unit to supply a fuel to an exhaust duct of said engine, said device of said HC dosing system comprising:
 a device for determining whether there is an undesired temperature level of said dosing unit;   if said determining device determines that said undesired temperature level of said dosing unit exists, the system is configured for removing warmed fuel from said dosing unit and for supplying said removed fuel to said exhaust duct;   a device for calculating and removing from said dosing unit an amount of said fuel based on a prevailing temperature of said dosing unit, or for removing a predetermined amount in the form of substantially all of said warmed fuel from said dosing unit and transferring said removed fuel to said exhaust duct.   
     
     
         10 . A device according to  claim 9 , further comprising said engine generates air exhaust flow when said engine is operating and ceases generating said exhaust flow when said engine is not operating; and
 said determination of whether there is said undesired temperature level is done after said cessation of an exhaust flow.   
     
     
         11 . A device according to  claim 9 , further comprising:
 a device for continuously cooling said dosing unit by generating a flow of said fuel to said dosing unit.   
     
     
         12 . A device according to  claim 9 , wherein said device for removing an amount of said fuel further comprises a device for intermittently removing said fuel from said dosing unit by supplying the removed fuel to said exhaust duct. 
     
     
         13 . A device according to  claim 9 , wherein said undesired temperature level is within a predetermined range. 
     
     
         14 . A device according to  claim 9 , further comprising:
 a device for continuously determining a prevailing temperature of said dosing unit in order to continuously detect occurrence of an undesired temperature level of said dosing unit.   
     
     
         15 . A device according to  claim 9 , further comprising:
 a device for removing said fuel from said dosing unit by existing pressurisation of the fuel in said dosing unit.   
     
     
         16 . A motor vehicle comprising a device according to  claim 9 . 
     
     
         17 . A motor vehicle according to  claim 16 , comprising a truck, bus or passenger car. 
     
     
         18 . A computer programme product pertaining to an HC dosing system for exhaust cleaning of an engine, wherein said programme product comprises non-transitory programme code with non-transitory programme instructions for causing a computer system to perform steps according to  claim 1  on an electronic control unit or causing another computer connected to the electronic control unit to perform such steps when instructions in said code are run on said computer. 
     
     
         19 . A computer programme product according to  claim 18 , wherein said product contains a programme code stored on a non-transitory computer-readable medium which can be read by said computer system for performing method steps when said computer programme is run on an electronic control unit or another computer connected to said electronic control unit. 
     
     
         20 . A method according to  claim 5 , wherein said undesired temperature level is within a range of 80-130 degrees Celsius. 
     
     
         21 . A device according to  claim 13 , wherein said undesired temperature level is within a range of 80-130 degrees Celsius. 
     
     
         22 . A device according to  claim 1 , wherein said dosing unit is at said exhaust duct where said dosing unit is heated.