A rotational angle detection device includes: a main driving gear; two driven gears; two sensors that detect the respective rotational angles of the two driven gears; and a computation circuit configured to compute the rotational angle of the main driving gear based on the respective rotational angles of the two driven gears. The computation circuit includes a difference computation circuit and a wear detection circuit. The difference computation circuit is configured to compute a first difference. The wear detection circuit is configured to detect wear of the two driven gears through a comparison between a value of the first difference that is computed by the difference computation circuit and a first ideal value.

The present disclosure relates to a magnetic field sensor including a first magnetic field sensor element configured to generate a first sensor signal in response to a magnetic field; a second magnetic field sensor element configured to generate a second sensor signal in response to the magnetic field; and a compensation circuit configured to compensate the first sensor signal using the second sensor signal, wherein the compensation circuit is configured to apply a correction to the first sensor signal at least if the second sensor signal is indicative of an orientation of the magnetic field parallel or perpendicular to an orientation of the second magnetic field sensor element, and if the first sensor signal is indicative of a different orientation of the magnetic field.

Provided herein is a system and method for cooling a sensor enclosure of a vehicle. The system comprises one or more sensors configured to determine a speed of the vehicle, an internal temperature of an enclosure, and an external temperature. The system comprises an enclosure to house the one or more sensors. The system comprises a fan disposed at a base of the enclosure. The system comprises a controller configured to regulate a rotation speed of the fan based on the speed of the vehicle, the internal temperature of the enclosure, the external temperature, or the difference between the internal temperature of the enclosure and the external temperature. The controller operates the fan at the regulated rotation speed.

One object is to calculate the position of a rod of a linear actuator with a high precision. The linear actuator includes a rod capable of moving in an axial direction relative to a housing. The rod is moved by rotation of an output shaft of a motor. A position sensor for sensing the relative position of the rod relative to a preset reference position is provided in the housing. A rotation sensor for sensing the rotation angle of the output shaft of the motor is provided in the vicinity of the motor. The linear actuator includes a position calculating unit for calculating the position of the rod based on a position sensing value of the position sensor and a rotation angle sensing value of the rotation sensor.

A system may include a sensor configured to output a sensor signal indicative of a distance between the sensor and a mechanical member associated with the sensor, a measurement circuit communicatively coupled to the sensor and configured to determine a physical force interaction with the mechanical member based on the sensor signal, and a compensator configured to monitor the sensor signal and to apply a compensation factor to the sensor signal to compensate for changes to properties of the sensor based on at least one of changes in a distance between the sensor and the mechanical member and changes in a temperature associated with the sensor.

A sensor device comprises a sensor unit for generating a signal indicative of a physical quantity. The device comprises a processing unit for receiving the signal, in which the processing unit comprises a storage memory for storing data derived from the signal as provided by the sensor unit at at least two points in time. The device comprises a bus interface for communicating with an electronic control unit via a digital communication bus. When a read command is received from the electronic control unit, an estimate of the physical quantity is sent in response to the electronic control unit. The processing unit comprises an estimator for calculating the estimate at a reference point in time based on the data stored in the storage memory, in which the reference point in time differs from the point in time at which the read command is received by substantially a predetermined offset.

A system for detecting a magnetic target includes a magnetic field sensor comprising two or more sensing clusters positioned on a surface of a substrate; and a magnetic target comprising at least four magnetic quadrants spaced evenly around a center point of the magnetic target. The at least four magnetic quadrants have alternating magnetic polarities. The two or more sensing clusters are positioned evenly around the axis of rotation so that each of the sensing clusters detects a magnetic field of two magnetic quadrants that have the same magnetic polarity.

A resolver signal processing device includes a deviation calculation unit, a PI operation unit, and an integration operation unit. The deviation calculation unit calculates a deviation between a first product obtained by multiplying a signal of phase A by a cosine value based on a reference phase θref and a second product obtained by multiplying a signal of phase B by a sine value based on the reference phase θref. The PI operation unit carries out a proportional integration operation which includes a first integration operation and is defined to converge the deviation on zero on the basis of the deviation. The integration operation unit carries out a second integration operation of integrating a value generated from a result of the proportional integration operation and outputs a result of the second integration operation as phase information of the resolver.

In one aspect, an angle sensor includes magnetic-field sensing elements that include a first pair, a second pair, a third pair and a fourth pair of magnetic-field sensing elements; and processing circuitry configured to determine an angle of a rotating ring magnetic having a plurality of North-South pole pairs each having a unique period length. The processing circuitry includes a first bridge formed from the first and second pairs of magnetic-field sensing elements and a second bridge formed from the third and fourth pairs of magnetic-field sensing elements. The angle includes a value from 0° to 360°. The first, second, third and fourth pairs of magnetic-field sensing elements are each disposed on a first axis. The first, second, third and fourth pairs of magnetic-field sensing elements each have a sensitivity in a first direction along the first axis. The angle sensor is formed on a single die.

A thermal regulation system includes an inertial measurement unit (IMU), one or more temperature adjusting devices in thermal communication with the IMU, and configured to adjust a temperature of the IMU from an initial temperature to a predetermined temperature, a filler provided in a space between the IMU and at least one temperature adjusting device of the one or more temperature adjusting devices, and a shared substrate configured to bear a weight of the IMU and the one or more temperature adjusting devices. The shared substrate includes a metallic board.