摘要:
A fuel pump for a direct injection system having: at least one pumping chamber; a piston which is mounted sliding inside the pumping chamber in order to vary cyclically the volume of the pumping chamber; an intake duct connected to the pumping chamber and regulated by an inlet valve; a delivery duct connected to the pumping chamber and regulated by a one-way delivery valve which allows exclusively a fuel flow outgoing from the pumping chamber; and a damping device, which is placed along the intake duct upstream of the inlet valve, and comprises at least one elastically deformable damping body that has internally a closed chamber filled with pressurized gas and composed of two metal plates cup shaped and welded together at their annular edges by an annular weld without interruptions.
摘要:
A method controls an internal-combustion engine (1) supercharged by a turbocharger (12) and including a turbine (13) and compressor (14). The control method comprises steps of determining a current reduced-mass-flow rate (QAHR) of the compressor (14), determining a safety threshold (Mmax_turbo) of the reduced-mass-flow rate (QAHR) that delimits in a “reduced-mass-flow rate/compression ratio” plane an area substantially close to achievement of sonic conditions, and imposing that the reduced-mass-flow rate (QAHR) has to be lower than a safety threshold (Mmax_turbo) of the reduced-mass-flow rate (QAHR).
摘要:
A hydraulic servo-control of a servo-controlled gearbox provided with a hydraulic accumulator, having an outer housing and a piston that is slidable axially inside the outer housing and adapted to define a first variable-volume chamber for a gaseous material and a second variable-volume chamber for a control fluid under pressure; and at least one limit stop arranged at an open end of the outer housing which serve as a lower limit stop element; wherein the outer housing is provided with an upper limit stop element, which acts to limit the pressure value inside the first variable-volume chamber within a predetermined safety range.
摘要:
A method of controlling an electro-actuated clutch in an internal combustion engine, the clutch including a clutch mechanism, an electric motor for actuating the clutch mechanism, and a mechanical transmission, which is interposed between the electric motor and the clutch mechanism. During a manufacturing phase of the system, a detachable connection is established in the mechanical transmission, wherein a first element simply rests on a second element to divide the electro-actuated clutch into a first part, arranged upstream of the detachable connection, and a second part, arranged downstream of the detachable connection. During operation, a first position signal generated by a first position sensor mechanically connected to a point of the first portion of the electro-actuated clutch is read, as is a second position signal generated by a second position sensor mechanically connected to a point of the second portion of the electro-actuated clutch. The first position signal is compared with the second position signal. A position in which the first position signal starts differing from the second position signal is recognized, and an estimate made of a closing position of the clutch mechanism coinciding with the position in which the first position signal starts differing from the second position signal.
摘要:
A method for controlling an internal-combustion engine comprises steps of: determining a current value of a driving torque requested to the internal-combustion engine and a first time derivative of the current value of the driving torque; comparing the current value of the driving torque and first time derivative with first and second threshold values, respectively; determining a “sports driving” condition only if the current value of the driving torque is higher than the first threshold value and the first time derivative is higher than the second threshold value; and controlling the internal-combustion engine as a function of the “sports driving” condition.
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 determines an injection law of a fuel injector to be tested in an injection system and includes steps of: completely interrupting feeding of fuel from a fuel pump to a common rail; avoiding opening of fuel injectors except for one injector to be tested; measuring initial pressure of the fuel inside the rail before starting the opening of the injector; opening the injector for consecutive openings greater than one with a same test-actuation time; measuring final pressure of the fuel inside the rail after ending the opening of the injector; determining a pressure drop in the rail during the opening of the injector, which is equal to a difference between the initial and final pressures; and estimating, according to the pressure drop in the rail, a fuel quantity that is actually injected by the injector when the injector is opened for the test-actuation time.
摘要:
A system for estimating the most probable path followed by a vehicle on a road network, including a device for acquiring a data element for locating the vehicle on the road network; a map of the territory through which the road network passes, comprising data indicative of the corresponding designated use of a plurality of areas of territory associated with the sections of the road network; and a processing unit arranged to assign an improved travel probability to a road section as a function of the designated use of the area of territory associated with the aforesaid road section. The system calculates the most probable path for the vehicle according to the improved probabilities assigned to the consecutive road sections. A method for estimating the most probable path followed by a vehicle on a road network is also disclosed.
摘要:
A vehicle includes an electrical traction and a reversible electric machine (8) that can be mechanically connected to drive wheels (3). An electrical system (11) of the vehicle includes a low-voltage storage system (14). An electronic power converter (15) has a positive pole (21) and a negative pole or an electrical ground (23) that are connected to the storage system (14) through a first electrical cable (18) defining a large section. An electronic control unit (17) controls the electronic power converter (15) and has a positive pole (24) and a negative pole or an electrical ground (25) that are connected to the storage system (14) through a second electrical cable (19) defining a small section. The electrical ground (23) of the electronic power converter (15) is connected to the electrical ground (25) of the electronic control unit (17) through an impedance having a value not lesser than substantially 100 ohms.
摘要:
A control method and unit of an electric traction motorcycle; there are provided: an accelerator grip pivotally mounted to rotate in a first rotation direction and about a rotation axis from a neutral position towards a maximum acceleration position; an elastic member which tends to keep the accelerator grip in the neutral position; at least one position sensor for detecting the angular position of the accelerator grip about the rotation axis; and a control device which drives an electric machine of the motorcycle according to the angular position of the accelerator grip; the accelerator grip is mounted to rotate in a second rotation direction opposite to the first rotation direction and about the rotation axis from the neutral position towards a deceleration position which is arranged in the direction opposite to the maximum acceleration position with respect to the neutral position.