A method for ignition control in a combustion chamber of an internal combustion engine by means of acquiring an electric signal relating to ionizing currents emitted in said combustion chamber, comprising a step of detecting a substantially stepped trend of said electric signal and a consequent step of inhibiting a corrective action of an ignition advance and/or of a fuel injection limitation curve in the combustion chamber.

An engine control module comprises an input terminal configured to receive an input signal, an analog-to-digital converter configured to receive the input signal from the input terminal, control circuitry configured to receive the input signal from the analog-to-digital converter and to control at least one engine output based on the input signal, and an adjustable low-pass filter. The adjustable low-pass filter is coupled between the input terminal and the analog-to-digital converter such that the analog-to-digital converter receives the input signal from the input terminal via the adjustable low-pass filter. The adjustable low-pass filter is configured to filter the input signal from the input terminal prior to the input signal being applied to the analog-to-digital converter. The adjustable low-pass filter has a first setting in which the adjustable low-pass filter has a first cut-off frequency and a second setting in which the adjustable low-pass filter has a second cut-off frequency, wherein the first setting configures the engine control module to be used with a first sensor having a first dynamic range and the second setting configures the engine control module to be used with a second sensor having a second dynamic range.

A method for determining a quantity of fuel injected into a cylinder of an internal combustion engine including an injection rail includes:—measuring the pressure prevailing in the injection rail during fuel injection from the rail into a cylinder;—filtering the pressure measurement;—determining the relative minimum and maximum points of the filtered pressure curve;—insofar as a first (Pdrop1) pressure drop followed by a pressure rise and then a second (Pdrop2) pressure drop is identified, determining a physical quantity that makes it possible to characterize the first pressure drop and the second pressure drop; and—determining the quantity of fuel injected by applying the bulk modulus for the two pressure drops identified as a function of the temperature in the injection rail.

A method for operating an injector on an internal combustion engine includes the steps of: introducing a fuel into a combustion chamber of the internal combustion engine by way of the injector; capturing, for a plurality of injection events, a wear value for the injector; assigning each respective one of the wear value that is captured to a respective one of a plurality of wear value classes; determining, for each of the plurality of wear value classes, a class frequency of a plurality of the wear value that are captured and assigned to a corresponding one of the plurality of wear value classes; calculating, based on a plurality of class frequencies of the plurality of wear value classes, a total wear value for the injector; and evaluating a condition of the injector based on the total wear value.

Provided is a signal processing device capable of effectively reducing a work load of a parameter setting operator in response to an increase in parameters constituting complicated filter control. Therefore, in the signal processing device filters an output signal from a sensor mounted on a vehicle, setting is made with respect to a plurality of filters having different filter types or filter coefficients for setting a filter characteristic of a cutoff frequency or a pass band, an individual code is set for each of the plurality of filters, and the signal processing device includes a CPU that selects the individual code based on an engine operating state so that a corresponding filter is selected, and processes an output signal from the sensor using the filter that has been selected.

Provided is a novel internal-combustion engine control device that can accurately determine a combustion state of an air-fuel mixture in a combustion chamber even in a case where operation is switched between a steady operation state and a transient operation state. For this purpose, the internal-combustion engine control device includes a physical quantity detection unit that detects a physical quantity that fluctuates output of the internal-combustion engine, an output fluctuation value calculation unit that calculates an output fluctuation value for each cylinder based on a detection result of the physical quantity detection unit, and a state determination unit that determines a transient operation state or a steady operation state based on a difference or a ratio between a first output fluctuation value of a predetermined first cylinder and a second output fluctuation value of a predetermined second cylinder calculated by the output fluctuation value calculation unit. Since combustion failure determination is performed in a section determined as the steady state, it is possible to accurately determine a combustion failure state of an air-fuel mixture of a cylinder even in a case where operation is switched between the steady operation state and the transient operation state.

A method for switching between a degraded mode and a normal mode for determining the angular position of an internal combustion engine of a vehicle. The method includes the following steps, in a degraded mode: detecting the free space and the teeth of the toothed wheel of the crankshaft from the signal generated by the crankshaft sensor during the rotation of the crankshaft, determining the minimum rotation speed of each combustion top dead center of the crankshaft during a revolution of the crankshaft from the detected free space and the detected teeth, determining the angular positions of the crankshaft corresponding to the minimum determined rotation speeds, and switching to normal mode when, for each combustion top dead center, the difference between the determined angular position of the crankshaft and a reference angular position value is below a predetermined position threshold for at least one revolution of the crankshaft.

A failure determination device: acquires a second digital value indicating a difference between an analog electrical output generated by inputting a first digital value incremented at a first time interval to a DA conversion circuit and a target output indicated by the first digital value at a second time interval; and determines whether the DA conversion circuit has a failure based on a signal strength in a predetermined frequency of the second digital value that is a discrete signal.

A damage analysis and control system is disclosed. An example process may include receiving a data set of measurements associated with a period of operation of a power system. The data set of measurements may identify a frequency that the power system is in an operating state during the period of operation, and the data set of measurements may identify a frequency of damage measurements associated with the operating state. The process may include determining, using a damage model and the data set of measurements, a damage score for the operating state during the period of operation of the power system. The process may include determining that the damage score satisfies a threshold damage score associated with the damage model and performing an action associated with the power system based on the damage score satisfying the threshold damage score.

A method for aligning cycles of an engine conditioning monitoring system includes: receiving data corresponding to a TDC angle of an engine from a crank angle sensor; receiving data from one or more accelerometers for each cylinder of the engine, the received data including vibration amplitude data; analyzing vibration amplitude data from the one or more accelerometers in relation to data corresponding to the TDC angle of the engine; characterizing vibration data using segmental band analysis, wherein segmental bands of the segmental band analysis correspond to valve closure angles of the engine; identify cylinders for which analyzed vibration amplitude data in relation to the TDC angle of the engine are out of phase; and align vibration amplitude data by shifting analyzed vibration amplitude data relative to the TDC angle of the engine such that vibration amplitude data is aligned with the TDC angle of the engine.