A method is provided for determining a number of revolutions per minute (RPM) of a rotating object. The method includes transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object. The method also includes transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals. The method also includes counting a number of echo signals detected by the fixed antenna, during one revolution of the object. The method also includes determining the RPM of the rotating object based on the number of response signals and the regular period of the signals. A system is also provided for determining the number of revolutions per minute (RPM) of the rotating object.

A method is provided for determining a number of revolutions per minute (RPM) of a rotating object. The method includes transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object. The method also includes transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals. The method also includes counting a number of echo signals detected by the fixed antenna, during one revolution of the object. The method also includes determining the RPM of the rotating object based on the number of response signals and the regular period of the signals. A system is also provided for determining the number of revolutions per minute (RPM) of the rotating object.

Two speed measurements of a moving body are generated using a single signal. A sensor generates a composite signal having a series of pulses where each pulse is generated when an element on a moving body passes the sensor. A sensor conditioning unit decouples the composite signal to generate a first conditioned sub-signal having only an AC signal corresponding to an AC component of the composite signal and a second conditioned sub-signal corresponding to the composite signal that may have either or both AC and DC components. A timer/counter input unit computes a first speed measurement by determining a count of pulses in the first conditioned sub-signal and a first time period or the time period of one pulse. The second conditioned sub-signal is transmitted to an analog-to-digital converter (ADC) and is sampled at a sampling rate to generate a sampled second conditioned sub-signal. An acquisition unit computes a second speed measurement by determining a count of pulses in the sampled second conditioned sub-signal over a second time period or the time of a single pulse. An analysis of the second conditioned sub-signal may be used to choose trigger or filter criteria for the analysis of both conditioned sub-signals, and multiple speed sensors may be used with each sensor producing two speed measurements.

The invention relates to a method for switching between a degraded mode and a normal mode for establishing the angular position of an internal combustion engine (10) of a vehicle (1), the method comprising the steps of, in degraded mode, detecting the free space and the teeth of the toothed wheel (130) of the crankshaft (13) during the rotation of the crankshaft (13) from the signal generated by the crankshaft sensor (16), establishing the angular positions of the crankshaft (13) corresponding to the minimum rotation speeds of the top dead centres established, and switching to normal mode when, for each top dead centre, the deviation between the angular position of the crankshaft (13) and a reference position is less than a position threshold for at least one revolution of the crankshaft (13).

A method for detecting a loosened bolted wheel joint on a wheel of a vehicle. The angular velocity of a hub of the wheel is evaluated. A periodic wheel modulation of the angular velocity is ascertained. An oscillation of the wheel generated due to the loosened bolted wheel joint is detected, using a step-change in a phase angle of the modulation by an expected angular increment, which is a function of the number of bolts.

Disclosed herein is a luminaire apparatus having an air cleaner attached thereto, which is connected by wires and cables so as to be vertically movable. More particularly, the luminaire apparatus enables a luminaire and air cleaner, which are considerably heavy, installed on a ceiling to be safely moved vertically using wires in order to perform replacement of light bulbs, replacement of air cleaner filters, troubleshooting, or maintenance, and is usable through supply of power to the luminaire and the air cleaner at a desired height by installing the air cleaner capable of vertically moving together with the luminaire and by installing power cables capable of supplying power even when the luminaire and the air cleaner are moved up and down.

A method for calculating a tread frequency of a bicycle includes obtaining a first state of an acceleration signal in a first time window, determining a feature point set from the acceleration signal when the first state includes a riding state, where time distribution of a feature point in the feature point set meets a preset periodic distribution condition, and amplitude meets a physical rule, determining that the first state is the riding state when a feature point subset in the feature point set meets a preset reasonableness condition, and calculating, based on the feature point subset, a quantity of circles and a tread frequency that are in the first time window.

Sensor assemblies incorporating a temperature varying resistor provide information regarding the temperature of the operating environment for a sensor or protect the sensor from extreme temperatures. The assembly includes only two conductors—one transmitting current from a power source and another transmitting an output signal. In one embodiment, the assembly includes a sensor and a temperature varying resistor in parallel between the conductors with the output signal including information regarding a value of a variable measured by the sensor and information regarding a temperature of an operating environment for the sensor. In another embodiment, the sensor and temperature varying resistor are in series between the conductors with the output signal including information regarding a value of a variable measured by the sensor and the temperature varying resistor preventing delivery of current to the sensor when a temperature of the operating environment for the sensor meets a predetermined condition.

Sensor assemblies incorporating a temperature varying resistor provide information regarding the temperature of the operating environment for a sensor or protect the sensor from extreme temperatures. The assembly includes only two conductors—one transmitting current from a power source and another transmitting an output signal. In one embodiment, the assembly includes a sensor and a temperature varying resistor in parallel between the conductors with the output signal including information regarding a value of a variable measured by the sensor and information regarding a temperature of an operating environment for the sensor. In another embodiment, the sensor and temperature varying resistor are in series between the conductors with the output signal including information regarding a value of a variable measured by the sensor and the temperature varying resistor preventing delivery of current to the sensor when a temperature of the operating environment for the sensor meets a predetermined condition.

A rolling bearing according to an embodiment includes a stationary ring having a first facing surface, a rotating ring having a second facing surface facing the first facing surface, and rotating relative to the stationary ring, rolling elements arranged between the first facing surface and the second facing surface, a cage that retains the rolling elements, first electrodes and second electrodes fixed in position relative to the stationary ring and arranged in a bearing space between the stationary ring and the rotating ring, third electrodes fixed in position relative to the rotating ring, position relative to the rolling elements, or position relative to the cage and arranged in the bearing space, and an insulating film formed on surfaces of the first electrodes and the second electrodes or surfaces of the third electrodes.