| Patent application number | Description | Published |
|---|
| 20090007885 | METHOD FOR CONTROLLING THE OVERPRESSURE IN A FUEL-SUPPLY SYSTEM OF A COMMON-RAIL TYPE - A method for controlling the overpressure in a fuel-supply system of a common-rail type for an internal-combustion engine provided with a number of cylinders; the method has the steps of supplying fuel under pressure to a common rail connected to a number of injectors by means of a high-pressure pump; detecting the effective value of the pressure of the fuel within the common rail; comparing the effective value of the pressure of the fuel within the common rail with a safety value; determining a condition of emergency if the effective value of the pressure of the fuel within the common rail is higher than the safety value; and driving, in the case of emergency, the injectors for discharging part of the fuel present in the common rail so as to contain the increase in pressure of the fuel within the common rail. | 01-08-2009 |
| 20090013966 | CONTROL METHOD FOR AN OVERPRESSURE VALVE IN A COMMON-RAIL FUEL SUPPLY SYSTEM - Control method for an overpressure valve in a common-rail fuel supply system, the method including the phases of: delivering fuel under pressure, via a high-pressure pump, to a common rail equipped with the overpressure valve that is set to discharge the fuel present in the common rail into a discharge line when the fuel pressure inside the common rail exceeds a safety value; piloting, during a diagnostic test, the high-pressure pump to increase the fuel pressure inside the common rail beyond the safety value in order to trigger operation of the overpressure valve; determining, during the diagnostic test, the flow of the high-pressure pump and/or the fuel pressure inside the common rail; and comparing the flow of the high-pressure pump and/or the fuel pressure inside the common rail during the diagnostic test with respective threshold values. | 01-15-2009 |
| 20090076711 | Control method for a direct injection system of the common-rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump - A control method of a direct injection system of the common-rail type; the control method contemplates: feeding the pressurized fuel to a common rail by means of a high-pressure pump which receives the fuel through a shut-off valve; cyclically controlling the opening and closing of the shut-off valve for choking the flow rate of fuel taken in by the high-pressure pump; driving the shut-off valve synchronously with respect to the mechanical actuation of the high-pressure pump by means of a driving frequency of the shut-off valve having a constant integer synchronization ratio, predetermined according to the pumping frequency of the high-pressure pump; estimating a perturbation intensity of the fuel pressure inside the common rail; and varying the phase of the commands of the shut-off valve with respect to the phase of the mechanical actuation of the high-pressure pump if the perturbation intensity of the fuel pressure inside the common rail is higher than a predetermined threshold value. | 03-19-2009 |
| 20090105929 | CONTROL METHOD FOR A DIRECT INJECTION SYSTEM OF THE COMMON-RAIL TYPE PROVIDED WITH A SHUT-OFF VALVE FOR CONTROLLING THE FLOW RATE OF A HIGH-PRESSURE - A control method of a direct injection system of the common-rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump; the control method contemplates the steps of: feeding the pressurized fuel to a common rail by means of a high-pressure pump which receives the fuel through a shut-off valve; cyclically controlling the opening and closing of the shut-off valve for choking the flow rate of fuel taken in by the high-pressure pump; adjusting the flow rate of fuel taken in by the high-pressure pump by varying the ratio between the duration of the opening time and the duration of the closing time of the shut-off valve; determining a lower limit value of the opening time of the shut-off valve; and adjusting the driving frequency of the shut-off valve so that the real opening time of the shut-off valve is always over the lower limit value. | 04-23-2009 |
| 20090139489 | CONTROL METHOD OF A DIRECT INJECTION SYSTEM OF THE COMMON RAIL TYPE PROVIDED WITH A HIGH-PRESSURE FUEL PUMP - A control method of a direct injection system of the common rail in an internal combustion engine; the control method contemplates the steps of: feeding the pressurized fuel to a common rail by means of a high-pressure pump presenting at least one pumping element mechanically operated by a drive shaft of the internal combustion engine; measuring the angular position of the drive shaft; measuring the fuel pressure in the common rail; analyzing the oscillations of the fuel pressure in the common rail; and determining the phase of the pumping element of the high-pressure pump with respect to the drive shaft according to the oscillations of the fuel pressure in the common rail. | 06-04-2009 |
| 20120010848 | METHOD FOR DETERMINING THE ROTATION SPEED OF A SUPERCHARGER IN AN INTERNAL COMBUSTION ENGINE - A method for determining the rotation speed of at least one supercharger in an internal combustion engine; the method includes detecting, by means of a microphone, the intensity of a sound signal generated by the rotation of the supercharger and determining the evolution of the frequency content of the sound signal over time; determining, completely irrespective of the sound signal, a first estimation of the rotation speed of the supercharger by means of which an interval of plausible frequencies for the rotation speed of the supercharger may be determined; determining a second estimation of the rotation speed of the supercharger according to the frequency content of the sound signal within the interval of plausible frequencies and validating the second estimation of the rotation speed of the supercharger by means of the first estimation of the rotation speed of the supercharger. | 01-12-2012 |
| 20120024266 | METHOD FOR DETERMINING THE ROTATION SPEED OF A SUPERCHARGER IN AN INTERNAL COMBUSTION ENGINE - 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. | 02-02-2012 |
