Grip sensor includes base material, sensor wire formed on base material, and sensor circuit electrically connected to an end of sensor wire. Sensor wire includes first wire portion on a side of sensor end, and a second wire portion on a side of power source end. In a state where base material is attached on a rim, second wire portion is disposed at an outer peripheral surface of the rim that is a site opposing a knee or thigh of a driver operating a steering wheel, and first wire portion is disposed at a front side and a rear side of the rim.

A system and method are provided in which a radio-frequency channel is used in combination with a second validation channel to verify the proximity of two devices to each other. An RF channel is used to detect whether two devices are within a first, larger distance from one another and to enable communication between the two devices, whilst a second, validation channel is used to accurately verify that the two devices are within second, smaller distance from one another. In some embodiments, the second verification channel is a magnetic channel.

Methods for determining performance information for an object located within an area include obtaining magnetic field information for the area, measuring first magnetic field data when the object is located at a first position within the area, and determining performance information for the object within the area based on the magnetic field information for the area and the first magnetic field data.

Provided are an electronic device and a wireless charging method and apparatus for an electronic device. In the wireless charging method, an environmental parameter transmitted by a wireless charging device is detected (S102); and a receiving antenna board within an electronic device is moved to a designated position according to the environmental parameter, wherein charging efficiency for charging the electronic device at the designated position is higher than charging efficiency for charging the electronic device at other positions (S104). The problems of wasting time and poor user experience caused by adjusting back and forth the electronic device in the process of wireless charging are solved. Free positioning of the antenna can be implemented, and time required by matching the electronic device and a wireless power supply device in the process of wireless charging can be greatly reduced.

A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

A proximity sensor with high accuracy without being subject to an influence due to magnet variations is disclosed. A first yoke is insert-molded in an intermediate position between N and S poles of a magnet, and a projecting portion of the first yoke projects from a wall face of the magnet vertically to a magnetic pole face. A protruding portion of a second yoke opposes the projecting portion to arrange a main body portion in parallel with the wall face of the magnet, and a hall IC having a direction of connecting the projecting portion and the protruding portion as a magnetic responsive direction is arranged in a space between the projecting portion and the protruding portion.

A magnetism detecting element detects a leakage magnetism from a scale, on which a magnetic signal with a constant period is recorded, and a relative position between the scale and the magnetism detecting element is detected. The magnetism detecting elements are arranged, along a detection direction of the magnetic signal relative to the scale, in a pattern with a pitch of 1/2n (n is a prime number of 3 or more) of a wavelength λ′ of a signal output by the element. Furthermore, as the pattern for cancelling m odd-order harmonics, the m-th power of 2 magnetism detecting elements are arranged within a range in which a pitch distance L of the magnetism detecting element farthest in the detection direction is expressed by L=(λ′/2)×(1/3+1/5+1/7+ . . . 1/(2m+1)).

A method that includes: providing a structure that is movable along a first axis; coupling a sensor assembly to the structure, the sensor assembly comprising first and second eddy current sensors and first and second targets that are mounted to the structure for movement along the first axis; sensing the first target with the first eddy current sensor and responsively generating a first sensor signal; sensing the second target with the second eddy current sensor and responsively generating a second sensor signal; and using the first and second sensor signals to determine a location of the structure along the first axis in a manner that is insensitive to coordinated movement of the first and second targets along a second axis that is perpendicular to the first axis and a third axis that is perpendicular to both the first and second axes.

A system and method for monitoring analog front-end (AFE) circuitry of an inductive position sensor. A redundant AFE channel is provided and alternatively utilized with a sine AFE channel or a cosine AFE channel of the AFE circuitry to obtain a voltage difference that may result in a detection angle error at the electronic control unit (ECU) of the inductive position sensor.

The invention relates to a positioning method for determining a position of a downhole tool moving at a velocity in a casing in a well, comprising the steps of measuring a magnitude and/or direction of a magnetic field by means of a first sensor several times over a time period while moving along a first part of the casing manufactured from metal, determining a manufacturing pattern of the casing along the first part from the measurement measuring a magnitude and/or direction of a magnetic field by means of the first sensor several times over a time period while moving along a second part of the casing manufactured from metal, determining the velocity of the tool along the second part, adjusting the determined velocity of the tool along the second part based upon the manufacturing pattern.