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1. (WO2018065053) AN INTERNAL COMBUSTION ENGINE AND A METHOD FOR CONTROLLING A BRAKING TORQUE OF THE ENGINE
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CLAIMS

1 . An internal combustion engine comprising

- a cylinder (301 , 302) comprising a piston connected to a rotatable crankshaft, - an air guide (901 ) arranged to guide an air flow to the cylinder (301 , 302),

- an adjustable air flow restriction element (903) arranged to restrict the flow through the air guide (901 ),

- an exhaust guide (501 , 502) being arranged to guide a gas flow from the cylinder (301 , 302),

- an adjustable exhaust flow restriction element (601 , 602) arranged to restrict the flow through the exhaust guide (501 , 502),

- an exhaust valve (7) arranged to control a communication between the cylinder (301 , 302) and the exhaust guide (501 , 502), and

- an exhaust valve actuation assembly (8) for actuating the exhaust valve (7) so as to perform in each of a plurality of cycles of the cylinder (301 , 302) an exhaust valve actuation sequence,

- characterized in that the exhaust valve actuation assembly (8) is adapted to

control the commencement of the exhaust valve actuation sequence to occur selectively at any crankshaft angle within a non-zero crankshaft angle interval.

2. An engine according to claim 1 , characterized in that the exhaust flow restriction element (601 , 602), the exhaust valve (7) and the exhaust valve actuation assembly (8) are adapted to provide a backpressure for the engine to provide a braking torque, and the air flow restriction element (903) is adapted to enable controllability of said braking torque.

3. An engine according to any one of the preceding claims, characterized in that the engine comprises a turbocharger (4) comprising a compressor (402), the air guide (901 ) being arranged to guide the air flow from the compressor (402) to the cylinder (301 , 302), wherein the adjustable air flow restriction element (903) is arranged between the compressor (402) and the cylinder (301 , 302).

4. An engine according to any one of the preceding claims, characterized in that the engine comprises a turbocharger (4) comprising a compressor (402), the air guide (901 ) being arranged to guide the air flow to the compressor (402) and from the

compressor to the cylinder, wherein the adjustable air flow restriction element (903) is arranged upstream of the compressor (402).

An engine according to any one of the preceding claims, characterized in that the air flow restriction element (903) is arranged to provide a plurality of levels of the air flow restriction depending on the adjustment of the air flow restriction element (903).

An engine according to any one of the preceding claims, characterized in that the air flow restriction element (903) is adapted to provide the restriction of the air flow restriction element (903) at any level within a non-zero restriction interval.

An engine according to any one of the preceding claims, characterized in that the air flow restriction element comprises a throttle valve (903) in the air guide (901 ).

An engine according to any one of the preceding claims, characterized in that the exhaust valve actuation assembly (8) includes a rotatable camshaft, wherein the exhaust valve actuation assembly (8) is controllable for adjusting the phase of the camshaft rotation in relation of the crankshaft rotation.

An engine according to any one of the preceding claims, characterized in that the exhaust valve actuation sequence is a decompression opening sequence (DOS1 , DOS2, DOS3) of the exhaust valve (7) commenced in a compression stroke of the respective cycle of the cylinder (301 , 302), the exhaust valve actuation assembly (8) being controllable for selectively providing the decompression opening sequence (DOS1 , DOS2, DOS3).

10. An engine according to any one of the preceding claims, characterized in that the exhaust valve actuation sequence is a charging opening sequence (COS1 , COS2, COS3) of the exhaust valve (7) commenced in a second half of an intake stroke or a first half of a compression stroke of the cylinder (301 , 302), the exhaust valve actuation assembly (8) being controllable for selectively providing the charging opening sequence (COS1 , COS2, COS3).

1 1 . An engine according to any one of the preceding claims, characterized in that the exhaust flow restriction element (601 , 602) is arranged to provide a plurality of levels of the exhaust flow restriction depending on the adjustment of the exhaust flow restriction element (601 , 602).

12. An engine according to any one of the preceding claims, characterized in that the exhaust flow restriction element (601 , 602) is adapted to provide the restriction of the exhaust flow restriction element (601 , 602) at any level within a non-zero restriction interval.

13. An engine according to any one of the preceding claims, characterized in that the exhaust flow restriction element comprises a throttle valve (601 , 602) in the exhaust guide.

14. An engine according to any one of the preceding claims, characterized in that the engine comprises a turbocharger (4) comprising a turbine (401 ), the exhaust guide (501 , 502) being arranged to guide the gas flow from the cylinder (301 , 302) to the turbine (401 ), wherein the adjustable exhaust flow restriction element (601 , 602) is arranged between the cylinder (301 , 302) and the turbine (401 ).

15. A method of controlling an internal combustion engine (1 ) in a vehicle comprising a cylinder (301 , 302), a fuel system for supplying fuel to the cylinder, an air guide (901 ) arranged to guide an air flow to the cylinder (301 , 302), an exhaust guide (501 , 502) arranged to guide a gas flow from the cylinder (301 , 302), an exhaust valve (7) arranged to control a communication between the cylinder (301 , 302) and the exhaust guide (501 , 502), the method comprising

- controlling the engine to provide a braking torque, the control comprising,

- terminating (S1 ) the supply of fuel to the cylinder (301 , 302),

- restricting (S4) the flow through the exhaust guide (501 , 502),

- restricting (S6) the flow through the air guide (901 ), and

- performing (S2) in each of a plurality of cycles of the cylinder (301 , 302) an

exhaust valve actuation sequence (MOS1 , DOS1 , COS1 ),

- characterized in that the control of the engine to provide a braking torque also comprises

determining (S3, S5) a value of at least one engine parameter affecting the pressure in the cylinder and/or the air mass flow through the cylinder,

in dependence on at least one of the at least one determined engine parameter value adjusting (S4) the timing of a commencement of the exhaust valve actuation sequence, and

in dependence on at least one of the at least one determined engine parameter value adjusting (S6) the restriction of the flow through the air guide (901 ).

16. A method according to claim 15, characterized in that each of the at least one the engine parameter is one of the engine rotational speed, a requested engine braking torque, a current engine braking torque, a pressure in the air guide (901 ), a rotational speed of a turbocharger (4) of the engine, and a pressure in the exhaust guide (501 , 502).

17. A method according to any one of claims 15-16, characterized in that adjusting (S6) the restriction of the flow through the air guide (901 ) comprises adjusting a throttle valve (903) in the air guide (901 ).

18. A method according to any one of claims 15-17, characterized in that the

adjustment of the restriction of the flow through the air guide (901 ) is a closed loop adjustment.

19. A method according to claim 18, characterized in that a pressure in the air guide (901 ) is a feedback parameter in the closed loop adjustment.

20. A method according to any one of claims 18-19, characterized in that a pressure in the exhaust guide (501 , 502) is a feedback parameter in the closed loop adjustment.

21 . A method according to any one of claims 15-20, characterized in that adjusting the timing of the commencement of the exhaust valve actuation sequence comprises adjusting the crankshaft angle at which the exhaust valve actuation sequence is commenced.

22. A method according to any one of claims 15-21 , characterized in that the adjustment (S4) of the timing of the commencement of the exhaust valve actuation sequence is an open loop adjustment.

23. A method according to any one of claims 15-22, characterized in that the exhaust valve actuation sequence comprises (S2) a decompression opening sequence (DOS1 , DOS2, DOS3) commenced in a compression stroke of the cylinder (301 , 302).

24. A method according to any one of claims 15-23, characterized in that the exhaust valve actuation sequence comprises (S2) a charging opening sequence (COS1 , COS2, COS3) of the exhaust valve commenced in a second half of an intake stroke or a first half of a compression stroke of the cylinder (301 , 302).

25. A method according to any one of claims 15-24, characterized by in dependence on at least one of the at least one determined engine parameter value adjusting (S4) the restriction of the flow through the exhaust guide (501 , 502).

26. A method according to claim 25, characterized in that the adjustment of the

restriction of the flow through the exhaust guide (501 , 502) is an open loop adjustment.

27. A method according to any one of claims 15-26, characterized in that restricting (S4) the flow through the exhaust guide (501 , 502) comprises adjusting a throttle valve (601 , 602) in the exhaust guide (501 , 502), and/or adjusting a flow adjustment function at a turbine (401 ) of a variable geometry turbocharger (4) of the engine, wherein the exhaust guide (501 , 502) is arranged to guide the gas flow from the cylinder to the turbine (401 ).

28. An internal combustion engine comprising

- a cylinder (301 , 302) comprising a piston connected to a rotatable crankshaft,

- an air guide (901 ) arranged to guide an air flow to the cylinder (301 , 302),

- an adjustable air flow restriction element (903) arranged to restrict the flow through the air guide (901 ),

- an exhaust guide (501 , 502) being arranged to guide a gas flow from the cylinder (301 , 302),

- an exhaust valve (7) arranged to control a communication between the cylinder (301 , 302) and the exhaust guide (501 , 502), and

- an exhaust valve actuation assembly (8) for actuating the exhaust valve (7) so as to perform in each of a plurality of cycles of the cylinder (301 , 302) an exhaust valve actuation sequence,

- characterized in that the exhaust valve actuation assembly (8) is adapted to

control the commencement of the exhaust valve actuation sequence to occur selectively at any crankshaft angle within a non-zero crankshaft angle interval.

29. A vehicle with an engine according to any one of claims 1 -14 and 28.

30. A method of controlling an internal combustion engine (1 ) in a vehicle comprising a cylinder (301 , 302), a fuel system for supplying fuel to the cylinder, an air guide

(901 ) arranged to guide an air flow to the cylinder (301 , 302), an exhaust guide (501 , 502) arranged to guide a gas flow from the cylinder (301 , 302), an exhaust valve (7) arranged to control a communication between the cylinder (301 , 302) and the exhaust guide (501 , 502), the method comprising

- controlling the engine to provide a braking torque, the control comprising,

- terminating (S1 ) the supply of fuel to the cylinder (301 , 302),

- restricting (S6) the flow through the air guide (901 ), and

- performing (S2) in each of a plurality of cycles of the cylinder (301 , 302) an

exhaust valve actuation sequence (MOS1 , DOS1 , COS1 ),

- characterized in that the control of the engine to provide a braking torque also comprises

- determining (S3, S5) a value of at least one engine parameter affecting the

pressure in the cylinder and/or the air mass flow through the cylinder,

- in dependence on at least one of the at least one determined engine parameter value adjusting (S4) the timing of a commencement of the exhaust valve actuation sequence, and

- in dependence on at least one of the at least one determined engine parameter value adjusting (S6) the restriction of the flow through the air guide (901 ).

31 . A computer program comprising program code means for performing the steps of any one of claims 15-27 and 30 when said program is run on a computer.

32. A computer readable medium carrying a computer program comprising program code means for performing the steps of any one of claims 15-27 and 30 when said program product is run on a computer.

33. A control unit (21 ) configured to perform the steps of the method according to any one of claims 15-27 and 30.