초록 ▼

The invention relates to a method for controlling the operation of a cylinder group for an internal combustion engine comprising an intake valve, an exhaust valve, handling members for controlling the opening of valves according to the predetermined conditions of the engine operation for selectively

The invention relates to a method for controlling the operation of a cylinder group for an internal combustion engine comprising an intake valve, an exhaust valve, handling members for controlling the opening of valves according to the predetermined conditions of the engine operation for selectively opening or closing said intake and exhaust valves, wherein the closing of the intake and exhaust valves is carried out at two distinct adapted times: for the intake valves, in the middle of a time extending between the theoretical intake valve closing timing of one cylinder and the intake valve opening timing of the other cylinder; for the exhaust valve of the cylinders, in the middle of a time extending between the exhaust valve theoretical closing timing of one cylinder and the exhaust valve opening timing of the other cylinder.

대표청구항 ▼

The invention claimed is: 1. Method of controlling the operation of a group of cylinders of an internal combustion engine of the four-stroke, multicylinder type, each of the cylinders of said group cooperating with at least one fuel injector, an intake valve, an exhaust valve, operating members for

The invention claimed is: 1. Method of controlling the operation of a group of cylinders of an internal combustion engine of the four-stroke, multicylinder type, each of the cylinders of said group cooperating with at least one fuel injector, an intake valve, an exhaust valve, operating members for controlling the opening of the valves according to the development of the cycle and means driven by an engine control computer according to predetermined operating conditions of said engine to activate or deactivate selectively said intake and exhaust valves, wherein the deactivation of said intake and exhaust valves of said cylinders is performed in the course of a same engine cycle at two distinct, adapted times: for the intake valves of said cylinders, at a time coinciding substantially with the middle of the period extending between the theoretical closing time of the intake valve of one of said cylinders and opening time of the intake valve of another of said cylinders; for the exhaust valves of said cylinders, to a time coinciding substantially with the middle of the period extending between the theoretical closing time of the exhaust valve of one of said cylinders and opening time of the exhaust valve of another of said cylinders. 2. Method according to claim 1, wherein the reactivation of said intake and exhaust valves is performed in the course of a same engine cycle at two distinct, adapted times: for the intake valves, at a time coinciding substantially with the middle of the period extending between the theoretical closing time of the intake valve of one of said cylinders and opening time of the intake valve of another of said cylinders; for the exhaust valves, to a time coinciding substantially with the period extending to the theoretical closing time of the exhaust valve of one of said cylinders and opening time of the exhaust valve of another of said cylinders. 3. Method according to claim 2, wherein there are two cylinders of said internal combustion engine of the four-stroke, multi-cylinder type whose operation is controlled, and the deactivation or activation of the intake and exhaust valves of the two cylinders is performed sequentially, one group of valves after another. 4. Method according to claim 2, wherein said driven means exhibit a delay between their control by said computer and the actual activation or deactivation of the valves, and this delay is taken into account to perform the control of said means. 5. Method according to claim 4, wherein the value of said delay is mapped as a function of the engine operating point, as well as of the aging of said engine. 6. Method according to claim 5, wherein an error value is determined on the measurement of said delay. 7. Method according to claim 6, wherein the error value is mapped as a function of the engine operating point, as well as of the aging of said engine. 8. Method according to claim 4, wherein an error value is determined on the measurement of said delay. 9. Method according to claim 8, wherein the error value is mapped as a function of the engine operating point, as well as of the aging of said engine. 10. Method according to claim 1, wherein there are two cylinders of said internal combustion engine of the four-stroke, multi-cylinder type whose operation is controlled, and the deactivation or activation of the intake and exhaust valves of the two cylinders is performed sequentially, one group of valves after another. 11. Method according to claim 1, wherein said driven means exhibit a delay between their control by said computer and the actual activation or deactivation of the valves, and this delay is taken into account to perform the control of said means. 12. Method according to claim 11, wherein the value of said delay is mapped as a function of the engine operating point, as well as of the aging of said engine. 13. Method according to claim 12, wherein an error value is determined on the measurement of said delay. 14. Method according to claim 11, wherein an error value is determined on the measurement of said delay. 15. Method according to claim 14, wherein the deactivation or activation of said valves of said cylinders is controlled only if the error value is lower than half the time interval separating the theoretical time: for the intake valves: from a time coinciding substantially with the middle of the period extending between the theoretical closing time of the intake valve of one of said cylinders and opening time of the intake valve of another of said cylinders; for the exhaust valves: from a time coinciding substantially with the middle of the period extending between the theoretical closing time of the exhaust valve of one of said cylinders and opening time of the exhaust valve of another of said cylinders. 16. Method according to claim 14, wherein the error value is mapped as a function of the engine operating point, as well as of the aging of said engine. 17. Method according to claim 11, wherein the error value is mapped as a function of the engine operating point, as well as of the aging of said engine. 18. Device for implementing the method according to claim 1, characterized in that said engine control computer comprises an appropriate program, this program being adapted to perform the control of said means for activating or deactivating the valves of said cylinders so that the deactivation or the activation of the valves of said cylinders is performed, in the course of a running engine cycle: for the intake valves of the cylinders, at a time coinciding substantially with the middle of the period extending between the theoretical closing time of the intake valve of one of said cylinders and opening time of the intake valve of another of said cylinders; for the exhaust valves of the cylinders , at a time coinciding substantially with the middle of the period extending between the theoretical closing time of the exhaust valve of one of said cylinders and opening time of the exhaust valve of another of said cylinders. 19. Device according to claim 18, wherein said driven means comprise disengageable hydraulic tappets interposed between said valves and said control members and two hydraulic circuits controlled each by an electrovalve controlled by the engine control computer. 20. Device according to claim 18, wherein said driven means comprise electromechanical actuators controlling the opening of the valves.