C.r.f. Societa Consortile Per Azioni

Andrea Pecori

Francesco Vattaneo

Stefano Chiappini

Lorentino Macor

Laura Gianolio

Mitzi Puccio

Emanuele Pisano

Constantino Vafidis

Costantino Vafidis

Emanuele PisanÒ

Described herein is a system for controlling a solenoid valve, which includes a driving circuit for driving a solenoid of the solenoid valve and a control unit for controlling the driving circuit. The control unit is configured for generating in the solenoid, during operation of the solenoid valve: first current signal for moving the open/close element from a first position to a second position, which is generated by the external supply network, to which the solenoid is connected; and second current signal, which is generated exclusively as a result of residual magnetism in the magnetic element of the solenoid valve and is activated when the open/close element is still in the aforesaid second position.

Solenoid-valve control system

In a Diesel engine with variably actuated valves, the cam controlling each inlet valve is shaped to provoke the opening of the respective inlet valve during the engine's normal exhaust phase and thus realize exhaust gas recirculation within the engine, due to the fact that during the normal exhaust phase, part of the exhaust gas passes from the cylinder into the inlet port, from where it returns to the cylinder during the next induction phase, while part of the exhaust gas that had previously passed into the exhaust port returns to the cylinder during the induction phase due to the additional opening of the exhaust valve, in consequence of which the exhaust gas charges that return to the cylinder are subjected to further combustion in the next engine cycle.

Multi-cylinder diesel engine with variably actuated valves

In an internal combustion engine provided with valves with variable actuation, each variable actuation valve is controlled by a hydraulic actuator unit through a rocker arm.

Internal combustion engine having valves with variable actuation and hydraulic actuating units which control the valves by means of rocker arms

In an internal-combustion engine with a hydraulic system for variable operation of the valves, the tappet actuated by each cam of the camshaft is slidably mounted in a tubular body which is made of a single piece with a bushing for guiding the valve-actuating piston.

Internal-combustion engine with hydraulic system for variable operation of the engine valves

Described herein is an internal-combustion engine provided with an electro-hydraulic device of an improved type for controlling variable actuation of the valves of the engine.

MULTICYLINDER INTERNAL-COMBUSTION ENGINE WITH ELECTRONICALLY CONTROLLED HYDRAULIC DEVICE FOR CONTROLLING VARIABLE ACTUATION OF THE VALVES, INTEGRATED IN A PRE-ASSEMBLED UNIT MOUNTED ON THE ENGINE CYLINDER HEAD

In an internal-combustion engine with a hydraulic system for variable operation of the valves, the piston for operating each valve includes an auxiliary hydraulic tappet.

Internal-combustion engine with variable-operation valves and auxiliary hydraulic tappet

In an internal-combustion engine with a hydraulic system for variable operation of the engine valves, there is envisaged at least one supplementary reservoir bled off to the atmosphere, communicating with the low-pressure circuit for compensating for the variations in volume of the hydraulic fluid that derive from the variations in temperature and for thus preventing air bubbles from forming in the circuit.

Internal-combustion engine with hydraulic system for variable operation of the valves and means for compensating variations in volume of the hydraulic fluid

In an internal combustion engine comprising an hydraulic system for the variable driving of valves, one tappet comprises two separate piston sections that are connected to two distinct pressure chambers, which control the driving pistons of two separate valves of the same engine cylinder.

Internal combustion engine with an hydraulic system for the variable driving of valves and a double-piston tappet

In an internal-combustion engine with a hydraulic system for variable operation of the valves, associated to the tappet controlled by each cam of the cam shaft is a passage for bleeding the hydraulic system.

Internal-combustion engine with hydraulic system for variable operation of the valves and with means for bleeding the hydraulic system

A multi-cylinder Diesel engine, for trucks, particularly of the type supercharged by a turbo-supercharger actuated by the exhaust gases, is provided with a variable valve actuation system for actuating the intake and exhaust valves, which, in combination with a specific geometry of the cams driving the valves, provides the possibility of a plurality of different modes of operation of the engine which can be selected according to the conditions of operation of the engine and including, in addition to the regular mode of operation, at least one mode of operation of the engine as a brake.

Growing community of inventors

Orbassano, Italy

Andrea Pecori