Method pertaining to air removal from a hc dosing system and a hc dosing system

Abstract

A method pertaining to an HC dosing system in which fuel in liquid form is supplied to a feed device ( 230 ) via which fuel is supplied from a container ( 205 ) to at least one consumption point ( 250 ) continuously detecting the feed pressure (P) which the feed device ( 230 ) furnishes. Also, the step of controlling the operation of the feed device ( 230 ) on the basis of changes (P′) in the feed pressure (P), to reduce the impact of unwanted air supply at the feed device ( 230 ). Also a computer programme product containing programme code (P) for a computer ( 200; 210 ) for implementing the method. Also an HC dosing system and a motor vehicle ( 100 ) which is equipped with the HC dosing system are disclosed.

1 . A method pertaining to an HC dosing system wherein the system includes a feed device which supplies fuel in liquid form from a container to at least one consumption point, the method comprising:
 continuously detecting a feed pressure furnished by said feed device; and   controlling said operation of said feed device based on changes in said feed pressure, with the object of reducing impact of unwanted air supply at said feed device.   
     
     
         2 . A method according to  claim 1 , further comprising altering the operation of the said feed device in correlation with the changes in said feed pressure. 
     
     
         3 . A method according to  claim 1 , wherein the controlling of the operation of said feed device is by a pump speed of said feed device. 
     
     
         4 . A method according to  claim 1 , wherein control of the operation of said feed device is towards a predetermined level of the feed pressure which said feed device is intended to furnish. 
     
     
         5 . A method according to  claim 1 , wherein control of the operation of said feed device is based on a time derivative of said detected feed pressure. 
     
     
         6 . A method according to  claim 1 , further comprising determining presence of air supplied upstream of said feed device, and when such presence of air is found, controlling operation of said feed device based on changes in said feed pressure. 
     
     
         7 . A method according to  claim 6 , further comprising determining said presence of air based on detected operating power of a power source which is configured and operable to powering said feed device and/or based on a determined time during which deviant operation of said feed device takes place. 
     
     
         8 . A method according to  claim 1 , wherein said feed device is a diaphragm pump. 
     
     
         9 . A method according to  claim 1 , wherein said at least one consumption point is a dosing unit. 
     
     
         10 . An HC dosing system for supplying fuel in liquid form, comprising:
 a fuel container, a feed device configured and operable for supplying fuel to at least one consumption point and for receiving fuel from said container;   a detector for continuously detecting a feed pressure furnished by said feed device; and   a device for controlling the operation of said feed device based on changes in said feed pressure, with the object of reducing impact of unwanted air supply at said feed device.   
     
     
         11 . An HC dosing system according to  claim 10 , further comprising a device for altering the operation of said feed device correlated with the changes in said feed pressure. 
     
     
         12 . An HC dosing system according to  claim 10 , wherein control of the operation of said feed device is by a pump speed of said feed device. 
     
     
         13 . An HC dosing system according to  claim 10 , wherein control of the operation of said feed device is towards a predetermined level of the feed pressure which said feed device is intended to furnish. 
     
     
         14 . A HC dosing system according to  claim 10 , wherein control of the operation of said feed device is based on a time derivative of said detected feed pressure. 
     
     
         15 . An HC dosing system according to  claim 10 , further comprising:
 a device for determining presence of air supplied upstream to said feed device; and when said presence of air is found, a device for controlling the operation of said feed device based on changes in said feed pressure.   
     
     
         16 . An HC dosing system according to  claim 15 , further comprising:
 said device for determining said presence of air based on detected operating power of a power source which is configured and operable to powering said feed device and/or based on a determined time during which deviant operation of said feed device takes place.   
     
     
         17 . An HC dosing system according to  claim 10 , wherein said feed device comprises a diaphragm pump. 
     
     
         18 . An HC dosing system according to  claim 10 , wherein said at least one consumption point is a dosing unit for fuel. 
     
     
         19 . A motor vehicle comprising an HC dosing system according to  claim 10 . 
     
     
         20 . A motor vehicle according to  claim 19 , comprising a truck, bus or passenger car. 
     
     
         21 . 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 on an electronic control unit or causing another computer connected to the electronic control unit to perform steps according to  claim 1  when instructions in said code are run on said computer system. 
     
     
         22 . A computer programme product according to  claim 21 , 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, wherein said computer programme is run on an electronic control unit or another computer connected to said electronic control unit. 
     
     
         23 . A method according to  claim 1 , wherein said dosing system is at an exhaust system of the vehicle where said dosing system is heated by said exhaust system. 
     
     
         24 . An HC dosing system according to  claim 10 , wherein said consumption point is at an exhaust system of the vehicle where said dosing system is heated by said exhaust system.