C.R.F. Società Consortile per Azioni Patente

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

An internal-combustion engine with two intake valves (7A, 7B) for each cylinder is provided with a system for variable actuation of the intake valves, comprising a single solenoid valve for each cylinder that controls communication of the pressurized-fluid chamber (C) of the system with an exhaust channel (23). The solenoid valve is a three-way, three-position solenoid valve, comprising an inlet (i) permanently communicating with the pressurized-fluid chamber and with the hydraulic actuator of an intake valve (7B), and two outlets (ul, u2) communicating, respectively, with the actuator of the other intake valve (7A) and with said exhaust channel. The solenoid valve has a first position (P1), in which the inlet communicates with both of the outlets, a second position (P2), in which the inlet communicates only with the aforesaid outlet (ul) connected to the actuator of an intake valve (7A) and does not communicate, instead, with the outlet (u2) connected to the exhaust channel (23), and a third position (P3), in which the inlet (i) does not communicate with any of the two outlets (ul, u2). There is envisaged an operating mode in which during at least part of the active stroke of the tappet said electrically actuated valve is kept in said third position (P3) so as to render the first intake valve (7B) active, whereas, throughout the active stroke of the tappet, the electrically actuated valve is never brought into said second position (P2) so that said second intake valve (7A) always remains closed.

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Zusammenfassung wird geladen …

A hybrid powertrain unit comprises an internal-combustion engine (E) and a gearbox device (C) with a primary shaft (3) that can be connected to the shaft (5) of the internal-combustion engine (E) via a clutch device (6). The gearbox device (C) comprises a secondary shaft (7) with an output pinion (9) meshing with a first crown wheel (10) of a differential (D), the casing (11) of which is rigidly connected to the casing (2) of the gearbox device (C). The unit further comprises an electric machine (M) adapted to operate both as electric motor and as electric generator, having a shaft (16) connected by means of a transmission to a second crown wheel (19) of the differential (D). In the connecting transmission, arranged between the shaft (16) of the electric machine (M) and the second crown wheel (19) of the differential (D) is an engagement device (25) that can be operated via an electronically controlled actuator. The transmission that connects the shaft (16) of the electric machine (M) to said second crown wheel (19) of the differential (D) includes an auxiliary shift device configured for providing at least two different selectable transmission ratios.

In a motor vehicle provided with an internal combustion engine having a system for variable actuation of the intake valves there is provided for a phase of activation of an operating mode with the engine off and the vehicle moving, in which the fuel supply to the engine is cut-off. After the cut-off of the fuel supply to the engine, the system for variable actuation of the intake valves is controlled to vary the opening time and/or closing time and/or the lift of the intake valves so as to control the losses due to the pumping effect which occur within the engine in cut-off condition. If the engine is equipped with starter capable of starting while engine moving, pumping losses are minimised to increase engine run down time. If the engine is equipped with starter capable of starting only engine at still stand, pumping loss are minimised as long as RPM is above threshold to allow restart by fuel supply and pumping losses are maximised when RPM is below threshold to reach quick stand still for restart by electric starter. This insures quick restart in case of driver change of mind in any case.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

An internal-combustion engine with two intake valves (7A, 7B) for each cylinder is provided with a system for variable actuation of the intake valves, comprising a single electrically actuated or electromagnetically actuated control valve for each cylinder that controls communication of the pressurized-fluid chamber (C) of the system with an exhaust channel (23). The control valve (24) is a three-way, three-position valve, comprising an inlet (i) permanently communicating with the pressurized-fluid chamber and with the hydraulic actuator of an intake valve (7B), and two outlets (ul, u2) communicating, respectively, with the actuator of the other intake valve (7A) and with said exhaust channel, and has an actuator that supplies a first value of current (11) for bringing the control valve into its aforesaid second position (P2); a second value of current (I2peak), for bringing the control valve into its aforesaid third position (P3); and a third value of current (I2hold).

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A method for forming a sheet made of an aluminium alloy into a component of complex shape, particularly a motor-vehicle component, such as the outer panel or the inner frame of a bonnet or a door of a motor- vehicle, provides for the blow-forming of the sheet, with the aid of pressurized gas, within a mould. The alloy constituting the sheet (L) does not have superplasticity features and the sheet (L) and/or the mould (M) are heated to a temperature in the order of 400° - 450° C for 5xxx series alloys and 450°-500° C and over for 6XXX and 7xxx series alloys. The maximum pressure reached by the forming gas is in the order of 20-30 bars and the time required for forming the sheet (L) is between 40 and 150 seconds and therefore is consistent with production rates in the automotive field. In a first part of the forming step, pressurized gas is fed into the mould while leaving that peripheral portions of the sheet (L) which are clamped within the mould are free to slide with respect to the mould, so as to enable a first forming of the sheet (L) with no substantial elongation thereof, and thereafter, in a second part of the forming step, this sliding movement is prevented and the pressurized gas is kept to be fed into the mould, so as to press the sheet against the wall of the mould (M), thus causing an elongation of the sheet (L) until its final shape is obtained.

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Zusammenfassung wird geladen …

An automotive air conditioning system (1) comprising: ¢ an air cooling circuit (4) including a compressor (7), a condenser (8), an expansion valve (9) and an evaporator (10), fluidically connected to be flowed, during operation, by a heat transfer fluid, and a blower fan (15) associated with the evaporator (10) and operable to generate an airflow through the evaporator (10); ¢ an air heating circuit (5) including a liquid/air heater (16) configured to be flowed, during operation, by a heat transfer fluid and arranged close to the evaporator (10) to be flowed also by the airflow generated by the blower fan (15) associated with the evaporator (10), and a flow rate regulation solenoid valve (17) arranged to regulate the flow rate of the heat transfer fluid through the heater (16); and ¢ an electronic control unit (27) configured to receive a measured evaporator air temperature (T EVAP ) and a set cabin air temperature (T CSP ) and to switch an operating condition of the compressor (7) when the measured evaporator air temperature (T EVAP ) exhibits a given relation with at least one on/off threshold temperature (T T ) computed, in at least certain operating conditions, based on the set cabin air temperature (T CSP ).

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

An internal-combustion engine is equipped with a system for variable actuation of the intake valves, comprising a single electrically actuated control valve (1; 100; 1') for each cylinder, which controls communication of the pressurized-fluid chamber (C) of the system with a discharge channel (23). The control valve (1; 100; 1') is a two-way valve, having at least three different operating positions, namely, a first operating position in which it is completely open, a second operating position in which it is only partially open, and a third operating position in which it is completely closed. Electronic control means are provided programmed for keeping the control valve (1; 100; 1') in its third, completely closed, position in operating stages in which the intake valve (7) must remain coupled to the respective cam and for bringing the control valve (1; 100; 1') from its third, completely closed, position to its second, partially open, position or to its first, completely open, position in operating stages in which the intake valve (7) must be uncoupled from the respective cam, selection between said first position and said second position of the control valve (1; 100; 1') being made as a function of one or more operating parameters of the engine.

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