A system and method for determining a position and or speed of a rotating shaft includes a target wheel for securement to a rotatable shaft, the target wheel including a plurality of North/South pole pairs, each pole of each North/South pole pairs being essentially the same size; and a sensor assembly. The sensor assembly includes a first magnetic sensor array for sensing the pole pairs to provide a cosine signal and a sine signal and a second magnetic sensor array for sensing the pole pairs to provide a cosine signal and a sine signal, wherein the second magnetic sensor array is disposed transverse to the first magnetic sensor array. An electronic processor is configured to receive inputs from the first magnetic sensor array and the second magnetic sensor array, and to determine a position and/or speed of the shaft.

A position sensor device includes position sensor elements for generating analog sense signals. A digitization circuit is provided for a digital signal representative of the input phase based on the analog sense signals and a digital processing unit. An output signal is indicative of the position based on the first output of the processing unit. The processing unit comprises an error signal generator for computing an error signal indicative of a phase difference between the digital signal and a feedback signal. A digital filter filters the error signal to generate the first output. A feedback path provides the feedback signal based on the first output and a filter selector to select a filter to be applied from different filters. At least one input on which a common filter circuit operates is scaled differently for each of the different filters to select different filter bandwidths.

A position sensor device includes position sensor elements for generating analog sense signals. A digitization circuit is provided for a digital signal representative of the input phase based on the analog sense signals and a digital processing unit. An output signal is indicative of the position based on the first output of the processing unit. The processing unit comprises an error signal generator for computing an error signal indicative of a phase difference between the digital signal and a feedback signal. A digital filter filters the error signal to generate the first output. A feedback path provides the feedback signal based on the first output and a filter selector to select a filter to be applied from different filters. At least one input on which a common filter circuit operates is scaled differently for each of the different filters to select different filter bandwidths.

An embodiment tire pressure sensor position identification apparatus includes a receiver configured to receive signals from tire pressure sensors and to receive information about wheel pulse counts from wheel speed sensors, the tire pressure sensors being mounted on an inner wheel and an outer wheel of a vehicle to have a specific phase difference therebetween, and a controller configured to identify positions where the tire pressure sensors are mounted based on the specific phase difference, the signals received from the tire pressure sensors, and the wheel pulse counts.

An embodiment tire pressure sensor position identification apparatus includes a receiver configured to receive signals from tire pressure sensors and to receive information about wheel pulse counts from wheel speed sensors, the tire pressure sensors being mounted on an inner wheel and an outer wheel of a vehicle to have a specific phase difference therebetween, and a controller configured to identify positions where the tire pressure sensors are mounted based on the specific phase difference, the signals received from the tire pressure sensors, and the wheel pulse counts.

A method for determining a speed using a measurement-sensor in a vehicle, the measurement-sensor including at least one coil and a ferromagnetic-transmitter-element, including: changing the inductance of the coil, using an inductive-speed-sensor having at least the coil and the ferromagnetic-transmitter-element; recording a change in the coil inductance, and determining the speed based on the changed coil inductance; in which in each case one inductive-speed-sensor is a wheel-speed-sensor for at least two vehicle wheels, and in which a reversal of the direction of movement of the ferromagnetic-transmitter-element as to the coil or a reversal of the direction of travel of the vehicle from forward travel to reverse travel or from reverse travel to forward travel is recognized based on at least one temporal-phase-offset of the temporal-profiles of the inductances recorded by the wheel-speed-sensors of the at least two wheels. Also described is a related driver assistance system and vehicle.

A method for determining a speed using a measurement-sensor in a vehicle, the measurement-sensor including at least one coil and a ferromagnetic-transmitter-element, including: changing the inductance of the coil, using an inductive-speed-sensor having at least the coil and the ferromagnetic-transmitter-element; recording a change in the coil inductance, and determining the speed based on the changed coil inductance; in which in each case one inductive-speed-sensor is a wheel-speed-sensor for at least two vehicle wheels, and in which a reversal of the direction of movement of the ferromagnetic-transmitter-element as to the coil or a reversal of the direction of travel of the vehicle from forward travel to reverse travel or from reverse travel to forward travel is recognized based on at least one temporal-phase-offset of the temporal-profiles of the inductances recorded by the wheel-speed-sensors of the at least two wheels. Also described is a related driver assistance system and vehicle.

An apparatus for estimating a tire resonance frequency may include a sensor for detecting rotation of a tone wheel; and a signal processor for calculating the detected rotation to produce a corrected wheel speed, filtering the corrected wheel speed in a predetermined manner to produce a filtered wheel speed from which engine noise is removed, and estimating a resonance frequency of a tire using the filtered wheel speed.

A method for controlling operation of an opposed piston engine is provided, comprising: determining a direction of rotation of the engine; comparing the determined direction of rotation to a correct direction of rotation of the engine; and responding to the determined direction of rotation being different from the correct direction of rotation by taking corrective action.

A method for controlling operation of an opposed piston engine is provided, comprising: determining a direction of rotation of the engine; comparing the determined direction of rotation to a correct direction of rotation of the engine; and responding to the determined direction of rotation being different from the correct direction of rotation by taking corrective action.