System and method for combustion engines
View Patent ↗The invention relates to a method for improving combustion in a combustion chamber of a combustion engine. The method comprises the first step of receiving a measured air-to-fuel ratio value. Further, the method comprises the step of receiving at least one estimated air-to-fuel ratio value. The air-to-fuel ratio estimate is generated in dependence of a predetermined fuel deposit factor. Furthermore, the method comprises the step of establishing a fuel volatility value in dependence of said measured air-to-fuel ratio value and said air-to-fuel ratio estimate. Finally the method comprises the step of controlling combustion in dependence of said fuel volatility value.
1. A method for controlling combustion in a combustion chamber of a combustion engine, comprising:
receiving (s 53 ) a measured air-to-fuel ratio value,
receiving (s 55 ) at least one estimated air-to-fuel ratio value, said air-to-fuel ratio estimate being generated in dependence of a predetermined fuel deposit factor,
establishing a fuel volatility value in dependence of said measured air-to-fuel ratio value and said air-to-fuel ratio estimate, and
controlling combustion in dependence of said fuel volatility value.
2. A method according to claim 1 , wherein said measured air-to-fuel ratio value is compared to said air-to-fuel ratio estimate and said fuel volatility value is generated in dependence of said comparison.
3. A method according to claim 1 , wherein said fuel volatility value is generated in dependence of said measured air-to-fuel ratio value and a plurality of air-to-fuel ratio estimates.
4. A method according to claim 3 , wherein said plurality of air-to-fuel ratio estimates are of mutually different values.
5. A method according to claim 1 , wherein said at least one air-to-fuel ratio estimate is generated in dependence of a predetermined fuel deposit factor (X i ) and at least one detected engine parameter value (M f , M a ).
6. A method according to claim 4 , wherein said plurality of mutually different air-to-fuel ratio estimates are generated in dependence of the same detected engine parameter value (M f , M a ) and mutually different predetermined fuel deposit factor (X i ).
7. A method according to claim 1 , wherein said measured air-to-fuel ratio value is delivered by an air-to fuel ratio sensor ( 210 , 11 c ) positioned to detect an actual air-to-fuel ratio in an exhaust manifold ( 225 a ).
8. A system for controlling combustion in a combustion chamber of a combustion engine, comprising:
first means ( 335 ) for receiving a measured air-to-fuel ratio value (λ meas ),
second means (P 1 , P 2 . . . PN) for receiving at least one air-to-fuel ratio estimate (λ 1 , λ 2 . . . λ N ), said air-to-fuel ratio estimate being generated in dependence of a predetermined fuel deposit factor,
third means ( 330 , 700 ) for generating a fuel volatility value in dependence of said measured air-to-fuel ratio value and said air-to-fuel ratio estimate, and
fourth means ( 360 ) for controlling combustion in dependence of said fuel volatility value.
9. A system according to claim 8 , wherein said third means ( 330 , 700 ) is adapted to compare said measured air-to-fuel ratio value to said air-to-fuel ratio estimate and to generate said fuel volatility value in dependence of said comparison.
10. A system according to claim 8 , wherein said fuel volatility value is generated in dependence of said measured air-to-fuel ratio value and a plurality of air-to-fuel ratio estimates (λ 1 , λ 2 . . . λ N ).
11. A system according to claim 8 , wherein said plurality of air-to-fuel ratio estimates (λ 1 , λ 2 . . . λ N ) are of mutually different values.
12. A system according to claim 8 , wherein said third means ( 330 , 700 ) is adapted to generate at least one air-to-fuel ratio estimate (λ 1 , λ 2 . . . λ N )in dependence of a predetermined fuel deposit factor (X i ) and at least one detected engine parameter value (M f , M a ).
13. A system according to claim 8 , wherein said third means ( 330 , 700 ) is adapted to generate a plurality of mutually different air-to-fuel ratio estimates (λ 1 , λ 2 . . . λ N ) in dependence of the same detected engine parameter value (M f , M a ) and mutually different predetermined fuel deposit factor (X i ).
14. A system according to claim 8 , wherein said air-to-fuel ratio sensor ( 210 , 11 ) is positioned to detect an actual air-to-fuel ratio value in an exhaust pipe ( 228 ) and adapted to deliver said measured air-to-fuel ratio value (λ meas ).
15. A computer program for causing a computerized apparatus ( 8 ; 700 ) to improve combustion in a combustion chamber of a combustion engine, comprising:
a computer readable code means which, when run on a computerized apparatus ( 8 , 700 ), causes the computerized apparatus ( 8 ; 700 ) to:
receive (s 53 ) a measured air-to-fuel ratio value, receive (s 55 ) at least one estimated air-to-fuel ratio value, said air-to-fuel ratio estimate being generated in dependence of a predetermined fuel deposit factor,
establish a fuel volatility value in dependence of said measured air-to-fuel ratio value and said air-to-fuel ratio estimate, and
control combustion in dependence of said fuel volatility value.