Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (WO2018004426) DETERMINATION OF PRESSURIZED FUEL TEMPERATURE
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. Method (300) for determining a temperature Ttot for pressurized fuel included in a high pressure fuel system (250) arranged for providing fuel to an engine (101), characterised in

- determining (301) a first temperature Ti for a first fuel volume Vi included in a first section (251) of said high pressure fuel system (250), said first section (251) including a common rail fuel system (253);

- determining (302) a second temperature T2 for a second fuel volume V2 included in a second section (252) of said high pressure fuel system (250), said second section (252)

including at least one fuel injector (271, 272, 273, 27n) arranged in a cylinder head (280) of said engine (101); and - determining (303) said temperature Ttot for said pressurized fuel based at least on said first temperature Ti and said second temperature T2; Ttot=f(Ti, T2) .

2. The method (300) as claimed in claim 1, wherein said determining (303) of said temperature Ttot for said pressurized fuel includes weighting said first temperature Ti with said first volume Vi and weighting said second temperature T2 with said second volume V2; Ttot = Tl Vl+T2 Vz .

3. The method (300) as claimed in any one of claims 1-2, wherein said temperature Ttot is determined as a mean

temperature Tmean; Ttot=Tmean; for a total volume Vtot of

pressurized fuel included in said high pressure fuel system (250) .

4. The method (300) as claimed in any one of claims 1-3, wherein said determining (301) of said first temperature Ti includes :

- measuring a rail body temperature Traii_body for said common rail fuel system (253); and

- determining said first temperature Ti based on said rail body temperature Traii__body ·

5. The method (300) as claimed in any one of claims 1-4, wherein said determining (301) of said first temperature Ti includes direct measurement of a fuel temperature Traii_fuei for fuel within said common rail fuel system (253) .

6. The method (300) as claimed in any one of claims 1-5, wherein said determining (302) of said second temperature T2 includes :

- measuring at least one injector body temperature Tinject_body for said at least one injector (271, 272, 273, 27n) ; and

- determining said second temperature T2 based on said at least one injector body temperature Tinject_body .

7. The method (300) as claimed in any one of claims 1-6, wherein said determining (302) of said second temperature T2 includes direct measurement of at least one fuel temperature Tinject_fuei for fuel within at said least one fuel injector (271, 272, 273, 27n) .

8. The method (300) as claimed in any one of claims 1-7, wherein said determining (302) of said second temperature T2 includes :

- measuring at least one coolant temperature TCOoiant for coolant water flowing through said cylinder head (280); and

- determining said second temperature T2 based on said at least one coolant temperature TCOoiant.

9. The method (300) as claimed in any one of claims 1-8, wherein said determining (303) of said temperature Ttot for said pressurized fuel is based also on at least one additional parameter Paradd being related to said fuel system and/or to a vehicle (100) in which said high pressure fuel system (250) is included; Ttot=f(Ti, T2, Paradd) .

10. Method (300) as claimed in claim 9, wherein said at least one additional parameter Paradd includes one or more in the group :

- a fuel flow through said high pressure fuel system (250);

- a placement of said high pressure fuel system (250);

- a layout for an engine house in which said high pressure fuel system (250) is located;

- an effect of a cooling fan of a cooling system arranged for cooling said engine (101);

- an environmental temperature surrounding said high pressure fuel system (250);

- a cooling effect on said high pressure fuel system (250) provided by surrounding air;

- a velocity of said vehicle (100); and

- a fuel pressure.

11. Computer program, characterized in code means, which when run in a computer causes the computer to execute the method according to any of the claims 1-10.

12. Computer program product including a computer

readable medium and a computer program according to claim 11, wherein said computer program is included in the computer readable medium.

13. System (200) for determining a temperature Ttot for pressurized fuel included in a high pressure fuel system (250) arranged for providing fuel to an engine (101), characterised in

- a first determining unit (141) arranged for determining (301) a first temperature Ti for a first fuel volume Vi

included in a first section (251) of said high pressure fuel system (250), said first section (251) including a common rail fuel system (253);

- a second determining unit (142) arranged for determining (302) a second temperature T2 for a second fuel volume V2 included in a second section (252) of said high pressure fuel system (250), said second section (252) including at least one fuel injector (271, 272, 273, 27n) arranged in a cylinder head (280) of said engine (101); and

- a third determining unit (143) arranged for determining

(303) said temperature Ttot for said pressurized fuel based at least on said first temperature Ti and said second temperature T2; Ttot=f (Ti, T2) .

14. The system (200) as claimed in claim 13, wherein said first determining unit (141) utilizes at least one sensor in the group of :

- a temperature sensor (292) embedded in material of a body (450) of said common rail fuel system (253);

- a temperature sensor (291) attached to a body (450) of said common rail fuel system (253) ; and - a temperature sensor (291) being in direct contact with fuel within said common rail fuel system (253) .

15. The system (200) as claimed in any one of claims 13-14, wherein said second determining unit (142) utilizes at least one sensor in the group of:

- a temperature sensor (295) embedded in material of a body of said at least one injector (271, 272, 273, 27n) ;

- a temperature sensor (296) being in direct contact with fuel within said at least one injector (271, 272, 273, 27n) ; - a temperature sensor (293) embedded in a part of a cooling system (281, 282) for said engine (101);

- a temperature sensor (294) being in direct contact with coolant water flowing through a cooling system (281, 282) for said engine (101); and

- a temperature sensor being in direct contact with engine oil included in said engine (101) .