Patent application number | Description | Published |
20090210123 | Method and Unit for Shifting Gear in a Power-Assist Transmission - A method and unit for shifting gear in a power-assist transmission; to shift gear, a series of operations are performed in sequence, and each of which must be completed prior to completion of the next operation; for each operation, a predicted time delay is estimated corresponding to the time lapse between the instant the operation is commanded and the instant the operation is actually completed; and the operations are commanded successively as a function of the predicted delay times, so that an operation is commanded before the preceding operation has actually been completed. | 08-20-2009 |
20090216413 | METHOD OF GEAR-SHIFTING IN A SERVO-CONTROLLED MANUAL GEARBOX - A method of gear shifting in a servo-controlled gearbox. The method generates an oscillation on angular velocities of primary and secondary shafts of the gearbox, separates the primary shaft from the secondary shaft thus disengaging a first current gear when the oscillation has taken the angular velocity of the primary shaft close to the angular velocity that the primary shaft must assume to engage a second next gear, and connects the primary shaft to the secondary shaft thus engaging the second next gear when the oscillation has led the angular velocity of the secondary shaft to equalize the current angular velocity of the primary shaft multiplied by the transmission ratio of the second next gear. | 08-27-2009 |
20090241898 | METHOD OF CONTROLLING THE SPARK LEAD OF AN INTERNAL COMBUSTION ENGINE - A method of controlling the spark lead of an internal combustion engine having at least one cylinder fitted with a spark plug; the method including the steps of: determining a standard spark lead value; determining an engine knock index in the cylinder; calculating a correction factor as a function of the engine knock index; determining a modified spark lead value by applying the correction factor to the standard spark lead value; and controlling the spark plug using the modified spark lead value. The correction factor is calculated by statistically analyzing a number of engine knock indexes to calculate a cumulative distribution; comparing the cumulative distribution with at least one target value; and modifying the current correction factor value as a function of the comparison between the cumulative distribution and the target value. | 10-01-2009 |
20090282807 | Internal combustion engine with deactivation of part of the cylinders and control method thereof - Internal combustion engine provided with a plurality of cylinders divided into a first group and a second group; a control unit for deactivating all the cylinders of the second group; a first exhaust conduit and a second exhaust conduit, which are reciprocally connected at an intersection and which are respectively connected to cylinders of the first group and to cylinders of the second group; a catalyzer, which is arranged along the first exhaust conduit upstream of the intersection and is provided with first sensors for detecting the exhaust gases; and a second catalyzer, which is arranged downstream of the intersection and is provided with second sensors for detecting the exhaust gas composition. | 11-19-2009 |
20110015035 | CONTROL METHOD FOR CARRYING OUT A GEAR UPSHIFTING IN AN AUTOMATIC MANUAL TRANSMISSION HAVING A DUAL-CLUTCH GEARBOX - An embodiment of a control method for carrying out a gear shifting in an automatic manual transmission having a dual-clutch gearbox to pass from a current shorter gear to a successive longer gear; the embodiment includes the steps of: receiving a gear shifting command; opening a first clutch associated to the current gear; closing a second clutch associated to the successive gear in a same first moment; finishing the opening of the first clutch associated to the current gear and finishing the closure of the second clutch associated to the successive gear in a same closing moment; keeping the rotation speed of the drive shaft of the engine constant and equal to an initial value imposed by the gear ratio of the current gear until the closing moment in which the opening of the first clutch is completed; after the closing moment, progressively decreasing the rotation speed of the drive shaft of the engine from the initial value imposed by the gear ratio of the current gear to a final value imposed by the gear ratio of the successive gear; and temporarily overlengthening the second clutch after the closing moment so that the second clutch temporarily transmits an additional torque which determines a progressive reduction of the rotation speed of the drive shaft from the initial value to the final value. | 01-20-2011 |
20110098895 | Control method of shifting gear in an automatic manual transmission - A control method of shifting gear in an automatic manual transmission to pass from a current gear to a successive gear; the automatic gear transmission comprises a gearbox, which is provided with at least one primary shaft and at least one secondary shaft connected to driving wheels, and at least one clutch, which is interposed between the primary shaft of the gearbox and a drive shaft of an engine; the control method comprises the steps of: determining, when the clutch is at least partially closed, a target torque that has to be transmitted through the clutch; determining, when the clutch is at least partially closed, a rotation speed target of the drive shaft of the engine; and determining a target engine torque of the engine according to the target torque that has to be transmitted through the clutch and according to the rotation speed target of the drive shaft of the engine. | 04-28-2011 |
20110246035 | CONTROL METHOD OF THE POSITION OF A SOLENOID VALVE USING DITHERING - Control method of the position of a solenoid valve using dithering; the control method provides the steps of: determining a target current across the solenoid valve which is expressed in digital form with a given minimum quantization interval; adding a dithering square wave to the target current; controlling the voltage applied to the solenoid valve to cause the current across the solenoid valve to track the target current added to the dithering square wave; jiggling the dithering square wave with a frequency which is a sub-multiple with respect to the maximum variation frequency of the current across the solenoid valve; and varying the amplitude of the dithering square wave for a fraction of the period of the dithering square wave itself and by an amount equal to the minimum quantization interval for temporarily determining a deviation of the mean value of the dithering square wave with respect to zero and therefore obtaining a corresponding variation of the mean value of the target current. | 10-06-2011 |