Method and system for controlling an internal combustion engine ii

A computer program product stored on a non-transitory computer-readable medium, said computer program product for controlling a compression-ignition internal combustion engine, said internal combustion engine having at least one combustion chamber, wherein intake of air to said combustion chamber is controlled using an intake valve, and wherein evacuation of said combustion chamber is controlled using an exhaust valve, said computer program product comprising computer instructions to cause one or more electronic control units or computers to perform the following operations:

• controlling opening of said intake valve and closing of said exhaust valve in dependence of the position of a reciprocating member in said combustion chamber, wherein, opening of said intake valve and closing of said exhaust valve, respectively, in relation to the position of said reciprocating member is individually controllable;
• controlling opening and closing in relation to the position of said reciprocating member on the basis of a first control parameter, wherein said opening and closing of said intake valve and exhaust valve, respectively, are controlled such that an actual value of said control parameter is adjusted towards a desired value of said control parameter, said first control parameter being an air/fuel ratio or a representation of remaining exhaust residuals in said combustion chamber;
• and
• in one mode of operation, controlling closing of said exhaust valve and opening of said intake valve, respectively, on the basis of said control parameter such that both said valves are simultaneously open during a period of variable length, so that intake air passes through the combustion chamber and simultaneously mixes with and evacuates exhaust residuals.

A system for controlling a compression-ignition internal combustion engine, said internal combustion engine having at least one combustion chamber wherein intake of air to said combustion chamber is controlled using an intake valve, and wherein evacuation of said combustion chamber is controlled using an exhaust valve, the system comprising:

• control means adapted to control opening of said intake valve and closing of said exhaust valve in dependence of the position of a reciprocating member in said combustion chamber, wherein opening of said intake valve and closing of said exhaust valve, respectively, in relation to the position of said reciprocating member is adapted to be individually controllable;
• control means adapted to control opening and closing of said valves in relation to the position of said reciprocating member on the basis of a first control parameter, wherein said opening and closing of said intake valve and exhaust valve, respectively, are controlled such that an actual value of said control parameter is adjusted towards a desired value of said control parameter, said first control parameter being an air/fuel ratio or a representation of remaining exhaust residuals in said combustion chamber;
• and
• control means adapted to control closing of said exhaust valve and opening of said intake valve, respectively, on the basis of said control parameter such that both said valves are simultaneously open during a period of variable length, so that intake air passes through the combustion chamber and simultaneously mixes with and evacuates exhaust residuals.

A vehicle comprising a system for controlling a compression-ignition internal combustion engine, said internal combustion engine having at least one combustion chamber, wherein intake of air to said combustion chamber is controlled using an intake valve, and wherein evacuation of said combustion chamber is controlled using an exhaust valve, the system comprising:

• control means adapted to control opening of said intake valve and closing of said exhaust valve in dependence of the position of a reciprocating member in said combustion chamber, wherein opening of said intake valve and closing of said exhaust valve, respectively, in relation to the position of said reciprocating member is adapted to be individually controllable;
• control means adapted to control opening and closing of said valves in relation to the position of said reciprocating member on the basis of a first control parameter, wherein said opening and closing of said intake valve and exhaust valve, respectively, are controlled such that an actual value of said control parameter is adjusted towards a desired value of said control parameter, said first control parameter being an air/fuel ratio or a representation of remaining exhaust residuals in said combustion chamber;
• and
• control means adapted to control closing of said exhaust valve and opening of said intake valve, respectively, on the basis of said control parameter such that both said valves are simultaneously open during a period of variable length, so that intake air passes through the combustion chamber and simultaneously mixes with and evacuates exhaust residuals.