System and method for controlling load and combustion in an internal-combustion engine by valve actuation according to a multiple lift (multilift) cycle
AssigneeC.R.F. Societa Consortile per Azioni
InventorMarco Lucatello
Life of this patent
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Abstract
An internal-combustion engine is equipped with a system of variable actuation of the intake valves that is controlled electronically for the purpose, of imparting on the valves different opening and closing times and different lifts according to the operating conditions of the engine. During one and the same cycle of operation of the engine, the system is able to impart on each intake valve a series of successive cycles of movements of opening and closing within the conventional cycle.
Claims16
A system for controlling load and combustion in an internal-combustion engine, comprising:
- at least one cylinder and at least one intake valve and an exhaust valve for controlling the flow of gases through the respective intake and exhaust pipes,
- in which at least one valve is governed by electronically controlled variable-actuation means designed to impart on the valve different opening and closing times, and different lifts, as the operating conditions of the engine vary,
- said control system being characterized in that said electronically controlled variable-actuation means are controlled by electronic-control means programmed for governing a given valve, in pre-determined conditions of operation of the engine, in such a way as to impart thereon a plurality of successive cycles of movements of opening and completely closing the intake valve within what would be a single conventional cycle of opening and closing the intake valve.
A method for controlling an internal-combustion engine of the type comprising at least one cylinder and at least one intake valve and an exhaust valve associated to the cylinder for controlling respective intake and exhaust pipes, and in which at least one valve is governed by electronically controlled variable-actuation means designed to impart on the valve different opening and closing times, and different lifts, as the operating conditions of the engine vary,
- said method being characterized in that the aforesaid variable-actuation means are controlled so that, in pre-determined conditions of operation of the engine, there is imparted on a given valve a series of successive cycles of movements of opening and completely closing the intake valve within what would be a single conventional theoretical cycle of opening and closing of the intake valve.
Dependencies are inferred from the claim text.