摘要:
A method for controlling an internal combustion engine comprising a number of cylinders and wherein the air mass trapped in each cylinder is adjusted by means of a respective intake valve by means of an actuation device with variable opening law; the method includes determining the required total target torque to be delivered; determining a number of active cylinders and a number of inactive cylinders; determining the angle for controlling the intake valve of the number of active cylinders and of the number of inactive cylinders, respectively; and controlling the internal combustion engine as a function of the control angle of the intake valves of the number of active cylinders and of the number of inactive cylinders.
摘要:
A method of controlling a vehicle equipped with an internal-combustion engine with a “stop and start” system. The method provides, during vehicle running, for learning the “duty cycle” values associated with the odd gears and even gears, determining the “maximum duty cycle” value for the odd gears and “minimum duty cycle” value for the even gears, determining a duty-cycle band to which the “neutral gear” condition corresponds on the basis of the “minimum duty cycle” value for the even gears and “maximum duty cycle” value for the odd gears, and controlling the “stop and start” system on the basis of the duty-cycle band to which the “neutral gear” condition corresponds.
摘要:
A method for determining the rotation speed of at least one supercharger which compresses the sucked air in an internal combustion engine; the control method, during the normal operation of the internal combustion engine, comprises the steps of detecting, by means of a microphone, the intensity of a sound signal generated by the rotation of the supercharger; determining a frequency content of the sound signal generated by the rotation of the supercharger; identifying the frequencies with maximum amplitude within the frequency content of the sound signal generated by the rotation of the supercharger; recognising the frequencies with maximum amplitude which are each other's multiples or submultiples; and determining the rotation speed of the supercharger using exclusively the frequencies with maximum amplitude which are each other's multiples or submultiples.
摘要:
A hydraulic servo-control of a servo-controlled gearbox comprises hydraulic actuators defining chambers, a storing tank containing control fluid used by the actuators at room pressure, a hydraulic accumulator containing control fluid under pressure, a motor pump drawing the fluid from the tank and feeding it under pressure to the accumulator, and solenoid valves selectively connecting the chambers to the tank and accumulator. The accumulator includes an outer housing defining an inner cylindrical surface defining a first diameter, a piston arranged and axially slidable and mobile inside the housing and defining there a first variable-volume chamber for a gas and second variable-volume chamber for the fluid under pressure, and a limit stopper arranged at an open end of the housing, acting as a striker for the piston, and having an annular circlip defining an opening and overall second diameter approximating by excess the first diameter of the surface of the housing.
摘要:
A fuel pump for a direct-injection system provided with a common rail comprises a pumping chamber defined in a main body. A piston is mounted in a sliding manner inside the pumping chamber to cyclically vary volume of the pumping chamber. A suction channel is connected to the pumping chamber and regulated by a suction valve. A delivery channel is connected to the pumping chamber and regulated by a delivery valve. A flow-rate-adjustment device is mechanically coupled to the suction valve to keep, when necessary, the suction valve substantially open during pumping of the piston and includes a control rod that is coupled to the suction valve and an electromagnetic actuator that acts on the control rod and has a one-way hydraulic brake that is integral to and substantially slows movement of the control rod.
摘要:
A multiphase synchronous electrical machine for converting kinetic energy into electrical energy and electrical energy into kinetic energy has a rotor extending along an axis, and a stator, which is provided with a stator pack having slots and with an electrical winding, which extends in part in the slots and in part in a position corresponding to two heads arranged on opposite sides of the stator pack and has bars housed in the slots and connected to one another in a position corresponding to the heads and connection plates, which are welded to the bars, are packed with respect to one another and to the stator pack in an axial direction and are shaped in such a way as to define a prolongation of the stator pack.
摘要:
A multiphase synchronous electrical machine for converting kinetic energy into electrical energy and electrical energy into kinetic energy has a rotor, extending along an axis, and a stator, which is provided with a stator pack having slots and with an electrical winding, which extends in part in the slots and in part at two heads arranged on opposite sides of the stator pack and which has bars, housed in the slots and connected to one at the heads, connection plates, each of which has: a main body having at least two seats for housing the bars; and an arm, which is set between the two seats and extends from the main body towards the axis.
摘要:
A method for the self-learning of the variation of a nominal functioning feature of a high pressure pump in an internal combustion engine, which pump feeds fuel to a common rail and is controlled by a solenoid valve depending on an objective pressure inside the common rail and by using the nominal functioning feature which provides a delivery of fuel; in cut-off conditions of the engine, the method includes determining the value of the pressure leaks due to blow-by in the common rail; measuring the real pressure of the fuel inside the common rail; actuating the high pressure pump by controlling the solenoid valve with a predetermined closing angle; measuring the real pressure of the fuel inside the common rail again; determining a pressure deviation between the real pressure and an expected pressure of the fuel, and correcting the nominal functioning feature according to this deviation.
摘要:
An intake manifold with a swirl system for an internal combustion engine provided with a number of cylinders; the intake manifold has, for each cylinder, an intake pipe, which is adapted to connect the intake manifold to the cylinder and has, in turn, two reciprocally parallel channels; the swirl system is provided with: for each intake pipe, a choking valve, which is arranged inside a channel of the intake pipe and is adapted to vary the air introduction section through the channel; and a single actuator device, which simultaneously and synchronically displaces all the choking valves and is provided with a motor and a mechanical transmission system which transmits the motion from the motor to all the choking valves.
摘要:
A direct-injection system fuel pump having: at least one pumping chamber; a piston mounted to slide inside the pumping chamber to cyclically alter the volume of the pumping chamber; an intake channel connected to the pumping chamber and regulated by an intake valve; a delivery channel connected to the pumping chamber and regulated by a one-way delivery valve that only permits fuel flow from the pumping chamber; and a drain channel regulated by a one-way, maximum-pressure valve, which opens when the fuel pressure in the drain channel exceeds a threshold value, and which has a shutter movable along the drain channel, a valve seat engaged in fluidtight manner by the shutter, and a spring calibrated to push the shutter into a position engaging the valve seat in fluidtight manner.