C.r.f. Societa Consortile Per Azioni

Marco Lucatello

Vittorio Doria

Francesco Vattaneo

Fabio Borean

Vittorio Crf Societa Consortile Per Azioni Doria

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

System for variable actuation of a valve of an internal-combustion engine

A multi-cylinder internal combustion engine is provided with a system for the variable actuation of the intake valves. At least one part of the engine cylinders is deactivated, cutting off fuel supply to said cylinders, under operating conditions that do not require the maximum power of the engine and in which one wants to reduce fuel consumption. The intake valves of the deactivated cylinders are kept at least partly open during at least one part of the discharge stages in the deactivated cylinders, hence, in the deactivated cylinders, part of the burnt gases generated during the operation prior to the deactivation flows into the respective intake conduits during the discharge stage of each cylinder. The intake valves are closed after the discharge stage. The intake valves of the deactivated cylinders are further kept closed during the compression and expansion stages in each deactivated cylinder.

Internal combustion engine with cylinders that can be de-activated, with exhaust gas recirculation by variable control of the intake valves, and method for controlling an internal combustion engine

A multicylinder petrol engine is provided with a hydraulic system for variable actuation of the valves, which enables easy control of operation of the engine according to different strategies. The engines according to the invention is, in particular, able to operate with a variable engine displacement in a modular way via the exclusion of selected cylinders, to control combustion by adjustment of the effective compression ration, and to control re-circulation of the exhaust gases at intake, in order to achieve low levels of consumption and reduced harmful exhaust emissions.

Multicylinder petrol engine with variable actuation of the valves

Multi-cylinder internal combustion engine wherein the intake valves, the injector means and the ignition means are controlled so as to adjust the enthalpy value of the exhaust gases produced by each cylinder independently from the other cylinders.

Internal combustion engine with torque adjustable in each cylinder

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.

System and method for controlling load and combustion in an internal-combustion engine by valve actuation according to a multiple lift (multilift) cycle

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Orbassano, Italy

Marco Lucatello