Methods and systems for calibrating an engine having a rotating shaft are provided. Readings from a plurality of speed sensors provided in one of a plurality of configurations about the shaft are obtained over a plurality of rotations of the shaft, the readings indicative of the passage of position markers and associated with a first precision level. A parameter indicative of relative spacing between the plurality of speed sensors is determined by applying a statistical algorithm to the readings, the parameter being associated with a second precision level higher than the first precision level. The parameter is compared to reference parameters associated with the plurality of configurations to identify an actual speed sensor configuration from amongst the plurality of configurations. The engine is calibrated based on the actual speed sensor configuration.

A method of monitoring the usage of an internal combustion engine is provided. The method comprises performing an engine monitoring routine using a local monitoring device directly attached to an internal combustion engine. The engine monitoring routine includes generating a plurality of data points representative of the crankcase pressure of the internal combustion engine using a pressure sensor of the local monitoring device, processing the generated data points to determine a first value representative of a firing frequency of the internal combustion engine, generating an aggregated summary of the internal combustion engine usage based on the first value, and transmitting identification data for the local monitoring device and the aggregated summary from the local monitoring device to a remote application. The remote application processes the transmitted aggregated summary based on the transmitted identification data to determine engine speed usage data for the internal combustion engine.

The present disclosure relates to systems and methods for improved anomaly detection for rotating machines. An example method may include determining a rotational speed of a rotating machine; determining, using a frequency domain transform of a signal, a frequency domain signal; determining, based on the rotational speed, a first frequency band within the frequency domain signal for identifying a fault frequency; determining a fault frequency within the first frequency band; determining, based on the fault frequency, a second frequency band within the first frequency band, wherein the second frequency band includes the fault frequency; determining, based on the second frequency band, a first fault index and a baseline of the first fault index; determining, based on a deviation of a second fault index from the baseline, a fault condition; and providing an alert based on the fault condition.

A method for determining the position of a motor-vehicle crankshaft with a rotating target wheel including markers distributed uniformly over its periphery and a signature, and a sensor sending an electrical signal with edges that appear during the passage of a marker or of the signature before the sensor, including: determining detection time of an edge; determining detection time and computing time difference between estimation and determination; determining angular error; determining presence of an abnormal edge when the angular error exceeds a threshold and storing the associated marker number in a first error list; when the signature passes, copying the first error list to the second if it does not exist; adjusting an occurrence counter depending on the error list; and if the errors are not transient, correcting edges with marker numbers in memory in the second error list, then sending a crankshaft position signal depending on the signal.

Multiple rotational irregularities in an internal combustion engine are determined. An uneven running value of a currently-ignited combustion chamber in a logical ignition sequence of a plurality of combustion chambers immediately after a logically-preceding ignited combustion chamber is determined. The uneven running value determined for the logically-preceding ignited combustion chamber exceeds a specified threshold value and indicates a fault in the logically-preceding ignited combustion chamber. A compensation factor is determined that. A compensated uneven running value of the currently-ignited combustion chamber from the uneven running value of the currently-ignited combustion chamber and the compensation factor is determined. The compensated uneven running value of the currently-ignited combustion chamber is compared with the specified threshold value to determine whether the currently-ignited combustion chamber has a fault.

A power system may include a power generation component and a sensor configured to measure a parameter. The power system may also include a controller in communication with the power generation component and the sensor. The controller may be configured to run the power generation component in an exercise mode for a duration. The duration may be based on the measured parameter.

In one embodiment, a method of determining correct engine phase in an internal combustion engine without a cam sensor, the engine having a plurality of piston-cylinders that cause rotation of a crankshaft and a fuel delivery assembly associated with each of the plurality of piston-cylinders, the method comprising monitoring an engine parameter, modifying an amount of fuel delivered to a known piston-cylinder, advancing a spark time one of the plurality of piston-cylinders, and determining an actual engine phase based on a change in the engine parameter.

An engine over speed detection circuit for determining an engine over speed condition is described. The circuit includes a detection unit configured to send a pulsed signal indicative of engine speed; a reactive impedance configured to discharge upon receipt of a pulse of the pulsed signal at a rate defined by the pulsed signal; a comparator unit to compare a voltage or current value of the reactive impedance with a threshold value and to output the result of the comparison at the rate of the pulsed signal.

A control apparatus for an internal combustion engine (i) acquires a rotational speed signal correlated with a rotational speed of the internal combustion engine, (ii) extracts, from the acquired rotational speed signal, at least first-order and lower-order than the first-order components of the rotational speed signal, (iii) extracts, from the acquired rotational speed signal, at least an n-th-order component of the rotational speed signal, (iv) determines that no disturbance has occurred when a first-order parameter regarding a magnitude of an amplitude of the extracted first-order and lower-order than the first-order components is smaller than a first threshold, and (v) determines that a disturbance has occurred when the first-order parameter is equal to or larger than the first threshold and an n-th-order parameter regarding an amplitude of the extracted n-th-order component is equal to or larger than a second threshold.

A method and system for measuring, determining and/or analyzing the cranking RPM of a vehicle is provided. The system measures the voltage of at least a portion of a vehicle's electrical system to determine high and/or low voltage time periods during at least a portion of a starting or cranking cycle. The time between high and/or low voltage points can then be used, along with the number of cylinders in the vehicle, to determine the cranking RPM of the vehicle. The system may include a load module and a control module that are removably coupled to one another in first and second configurations.