Patents by Inventor Stefano Nieddu

Stefano Nieddu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10094322
    Abstract: Technical solutions are described for measuring fuel injection to an engine of a vehicle. For example, an engine control unit (ECU) that controls the operation of the engine, is equipped with a first direct memory address channel to store rail pressure values that are received from the engine in a first buffer. The ECU further includes a second direct memory address channel configured to copy a first subset of the rail pressure value from the first buffer to a filter module in response to an angle-based interrupt request. The ECU further includes a third direct memory address channel configured to copy filtered pressure values from the filter module to a second buffer. The ECU also includes a processor that computes a pressure drop based on the filtered pressure values from the second buffer, and compute a quantity of fuel injected into the engine based on the pressure drop.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: October 9, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano Nieddu, Roberto Morone
  • Publication number: 20180230933
    Abstract: A method of calculating an angular position of a crankshaft at the occurrence of a fuel injection event includes integrating a first polynomial function, and integrating a second polynomial function. The integrated second polynomial function is then divided by the integrated first polynomial function to calculate the angular position of the crankshaft at the occurrence of the fuel injection event. The calculated angular position of the crankshaft at the occurrence of the fuel injection event may then be correlated to an absolute angular position of the crankshaft, relative to a Top Dead Center position of the crankshaft. The calculated angular position of the crankshaft at the occurrence of the fuel injection event may be used to adjust the injection timing of future fuel injection events.
    Type: Application
    Filed: February 16, 2017
    Publication date: August 16, 2018
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Stefano Nieddu
  • Patent number: 9988993
    Abstract: A control method is provided for using a feed forward technique. The method includes, but is not limited to using a setpoint value of a controlled variable to calculate a compensation of the closed loop static error, summing said contribution to the setpoint value, operating an estimation of the closed loop error to obtain a feed forward contribution.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: June 5, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano Nieddu, Gennaro Merlino
  • Patent number: 9874151
    Abstract: A method for automatically operating a cam-driven pump is disclosed. The pump is monitored to determine whether a specified detachment condition or potential detachment of an actuator of the pump from a driving cam is occurring. The pump is operated in a minimal pressure holding mode to provide a minimal pressure within a working chamber of the pump so as to bias the actuator towards the cam if it is determined that the detachment condition is occurring.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: January 23, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATONS LLC
    Inventors: Massimiliano Melis, Francesco Concetto Pesce, Stefano Nieddu, Andrea Mollar
  • Publication number: 20180017010
    Abstract: A method and apparatus are disclosed for determining the fuel quantity that is actually injected by a fuel injector in an internal combustion engine. A fuel injector is operated to perform a fuel injection. The first discharge stroke of the fuel pump is deactivated following a start of the fuel injection for preventing the discharge stroke from delivering fuel into the fuel rail. A value of a pressure drop caused into the fuel rail by the fuel injection is calculated. A value of a fuel quantity injected by the fuel injection is calculated on the basis of the calculated value of the pressure drop.
    Type: Application
    Filed: July 12, 2017
    Publication date: January 18, 2018
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Andrea MOLLAR
  • Patent number: 9845736
    Abstract: A method of determining the timing and quantity of fuel injection to operate an internal combustion engine is disclosed. While operating the fuel injector to perform a fuel injection; a signal of a fuel pressure within the fuel rail during the fuel injection is sampled. The signal is used to determine first and second integral transforms yielding as output a value of first and second functions having as variables the fuel rail pressure drop caused by the fuel injection and the timing parameter indicative of the instant when the fuel injection started. Values of the first and second functions are used to calculate a value of the fuel rail pressure drop caused by the fuel injection and a value of the timing parameter. A value of a fuel quantity injected by the fuel injection is calculated as a function of the value of the fuel rail pressure drop.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: December 19, 2017
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano Nieddu, Andrea Mollar
  • Patent number: 9765725
    Abstract: An apparatus and method for controlling a fuel injection system of an internal combustion engine is disclosed. Each fuel injector in the system is operated to perform a predetermined injection pattern per engine cycle. A signal representative of a fuel pressure within the fuel rail during the operation of the fuel injectors is sampled. A Fourier analysis of the fuel rail pressure signal is performed to determine one or more harmonic components thereof. The determined harmonic components of the fuel rail pressure signal are used to calculate a dynamic fuel quantity that flows through a fuel injector during an injection pulse of the injection pattern. A fuel quantity actually injected by the fuel injector during the injection pulse as a function of the dynamic fuel quantity is calculated.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: September 19, 2017
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Stefano Nieddu
  • Publication number: 20170108139
    Abstract: A circuit and a method for a digital inlet valve having a shutter moveable between a closed and an open position and actuated by a linear electromagnetic actuator including a movable needle located inside a coil winding connected to a power source by a first electronic switch. An electric current is supplied to the coil winding. A parameter indicative of a movement of the needle is monitored. The electric current supply is adjusted when the monitored parameter exceeds a predetermined value.
    Type: Application
    Filed: October 20, 2016
    Publication date: April 20, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Andrea MOLLAR, Tiziano SORRENTINO
  • Patent number: 9581102
    Abstract: A method and control apparatus are disclosed for operating a fuel-metering valve associated to a fuel pump arranged to supply fuel into a fuel rail, the fuel-metering valve having a valve member and an electric actuator arranged to move that member for regulating a fuel flow-rate. The control apparatus includes an electronic control unit connected to the fuel-metering valve and configured to implement a method of control using a target value, a nominal function corrected value to set an adjustable parameter of a control signal for the fuel-metering valve.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: February 28, 2017
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Stefano Nieddu
  • Publication number: 20160356238
    Abstract: A method of controlling the fuel rail pressure of a fuel injection system of an internal combustion engine is disclosed. A failure condition of a fuel rail pressure sensor is detected. A fuel rail pressure target value and an injector fuel output target value are determined on the basis of an internal combustion engine operating condition. A fuel pump output target value to be supplied into the fuel rail is determined. The fuel pump is driven in order to provide the fuel pump output target value. The fuel pump output target value is determined on the basis of the injector fuel output target value, and the fuel injector is energized for an energizing time target value determined on the basis of the fuel rail pressure target value and the injector fuel output target value.
    Type: Application
    Filed: June 1, 2016
    Publication date: December 8, 2016
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Stefano NIEDDU
  • Publication number: 20160333799
    Abstract: A method for automatically operating a cam-driven pump is disclosed. The pump is monitored to determine whether a specified detachment condition or potential detachment of an actuator of the pump from a driving cam is occurring. The pump is operated in a minimal pressure holding mode to provide a minimal pressure within a working chamber of the pump so as to bias the actuator towards the cam if it is determined that the detachment condition is occurring.
    Type: Application
    Filed: May 13, 2016
    Publication date: November 17, 2016
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Massimiliano MELIS, Francesco Concetto PESCE, Stefano NIEDDU, Andrea MOLLAR
  • Publication number: 20160215708
    Abstract: A method of determining the timing and quantity of fuel injection to operate an internal combustion engine is disclosed. While operating the fuel injector to perform a fuel injection; a signal of a fuel pressure within the fuel rail during the fuel injection is sampled. The signal is used to determine first and second integral transforms yielding as output a value of first and second functions having as variables the fuel rail pressure drop caused by the fuel injection and the timing parameter indicative of the instant when the fuel injection started. Values of the first and second functions are used to calculate a value of the fuel rail pressure drop caused by the fuel injection and a value of the timing parameter. A value of a fuel quantity injected by the fuel injection is calculated as a function of the value of the fuel rail pressure drop.
    Type: Application
    Filed: January 22, 2016
    Publication date: July 28, 2016
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Andrea MOLLAR
  • Patent number: 9261036
    Abstract: A method to minimize common rail pressure irregularities due to aliasing effect on battery voltage monitoring in a digital electronic control unit that is capable of PWM (Pulse Width Modulation) regulations of a metering valve unit in a diesel common-rail power-train system. At least an engine rotary speed signal is detected and at least a battery voltage signal is monitored, the method includes, but is not limited to calculating the aliasing frequency on said battery voltage signal as a function of said engine rotary speed signal, filtering the battery voltage signal before it is input to said controller module with at least one digital non-linear notch filter, the at least one digital non-linear notch filter centered about the first harmonic of the aliasing frequency, and input the filtered battery voltage signal, at least with the engine rotary speed signal, to the controller module for PWM regulating the metering valve unit.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: February 16, 2016
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano Nieddu, Maura Dintino
  • Publication number: 20150233318
    Abstract: An apparatus and method for controlling a fuel injection system of an internal combustion engine is disclosed. Each fuel injector in the system is operated to perform a predetermined injection pattern per engine cycle. A signal representative of a fuel pressure within the fuel rail during the operation of the fuel injectors is sampled. A Fourier analysis of the fuel rail pressure signal is performed to determine one or more harmonic components thereof. The determined harmonic components of the fuel rail pressure signal are used to calculate a dynamic fuel quantity that flows through a fuel injector during an injection pulse of the injection pattern. A fuel quantity actually injected by the fuel injector during the injection pulse as a function of the dynamic fuel quantity is calculated.
    Type: Application
    Filed: February 17, 2015
    Publication date: August 20, 2015
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Stefano Nieddu
  • Patent number: 9109959
    Abstract: A method is provided for measuring a resistance value of a resistive component, which provides for connecting a pull up resistance, in series to the component and supplying a first voltage value to a free end of the pull up resistance and a second lower voltage value to a free end of the component, monitoring a signal indicative of a voltage value between the component and the pull up resistance, determining the difference between the monitored signal and a generated PWM signal having a high voltage value and low voltage value, integrating the difference, obtaining an output signal, varying a duty cycle of the PWM signal based on the variation over time of the output signal, acquiring a duty cycle of the PWM signal, and determining the resistance value of the resistive component based on the duty cycle value and of the pull up resistance value.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: August 18, 2015
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano Nieddu, Fabio Autieri
  • Publication number: 20150027411
    Abstract: A method and control apparatus are disclosed for operating a fuel-metering valve associated to a fuel pump arranged to supply fuel into a fuel rail, the fuel-metering valve having a valve member and an electric actuator arranged to move that member for regulating a fuel flow-rate. The control apparatus includes an electronic control unit connected to the fuel-metering valve and configured to implement a method of control using a target value, a nominal function corrected value to set an adjustable parameter of a control signal for the fuel-metering valve.
    Type: Application
    Filed: July 29, 2014
    Publication date: January 29, 2015
    Inventor: Stefano Nieddu
  • Publication number: 20140081552
    Abstract: A control method is provided for using a feed forward technique. The method includes, but is not limited to using a setpoint value of a controlled variable to calculate a compensation of the closed loop static error, summing said contribution to the setpoint value, operating an estimation of the closed loop error to obtain a feed forward contribution.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 20, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Gennaro MERLINO
  • Publication number: 20120253720
    Abstract: A method is provided to minimize common rail pressure irregularities due to aliasing effect on battery voltage monitoring in a digital electronic control unit that is capable of PWM regulations of a metering valve unit in a diesel common-rail power-train system. At least an engine rotary speed signal is detected and at least a battery voltage signal is monitored, the method includes, but is not limited to calculating the aliasing frequency on said battery voltage signal as a function of said engine rotary speed signal, filtering the battery voltage signal before it is input to said controller module with at least one digital non-linear notch filter, the at least one digital non-linear notch filter substantially centered on the first harmonic of the aliasing frequency, and input the filtered battery voltage signal, at least with the engine rotary speed signal, to the controller module for PWM regulating the metering valve unit.
    Type: Application
    Filed: March 26, 2012
    Publication date: October 4, 2012
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Maura DINTINO
  • Publication number: 20120185193
    Abstract: A method is provided for measuring a resistance value of a resistive component, which provides for connecting a pull up resistance, in series to the component and supplying a first voltage value to a free end of the pull up resistance and a second lower voltage value to a free end of the component, monitoring a signal indicative of a voltage value between the component and the pull up resistance, determining the difference between the monitored signal and a generated PWM signal having a high voltage value and low voltage value, integrating the difference, obtaining an output signal, varying a duty cycle of the PWM signal based on the variation over time of the output signal, acquiring a duty cycle of the PWM signal, and determining the resistance value of the resistive component based on the duty cycle value and of the pull up resistance value.
    Type: Application
    Filed: January 18, 2012
    Publication date: July 19, 2012
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Stefano NIEDDU, Fabio AUTIERI
  • Patent number: 8050010
    Abstract: A method is provided that includes, but is not limited to the steps of driving in an on-off manner in a period of time an electronic switch in series with a respective glow plug between the terminals of a d.c. voltage supply, sensing the glow plug voltage and the glow plug current, generating analogue sense signals representative of the time integral of the glow plug voltage and current, generating analogue reference signals corresponding to the digital values of corresponding control words, comparing the sense signals to the respective reference signals and modifying the corresponding control words so as to minimize the difference between the sense signals and the reference signals, calculating the average values of the sensed voltage and current on the basis of the values of the control words at the beginning and at the end of the “on” time of the electronic switch.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: November 1, 2011
    Assignee: GM Global Technology Operations LLC
    Inventors: Paolo Casasso, Angelo Argento, Stefano Nieddu