Inductive position sensor

A measuring device, inductive technology, applied in the direction of measuring device, measuring heat, using electrical devices, etc., can solve the problems of damage of measurement results, difficulty of fully shielding external magnetic field, and cumbersome problems

Inactive Publication Date: 2012-08-01
ROLLAX GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, when this path measuring device is used in a motor vehicle, the path measuring device may be affected by magnetic fields formed elsewhere in the vehicle
Adequately shielding external magnetic fields can be difficult and cumbersome in certain installation conditions of the vehicle transmission, but if these external fields are not adequately shielded, there is a risk that the external magnetic field will induce a voltage in the sensor coil and therefore may damage to the measurement results

Method used

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Examples

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Embodiment Construction

[0020] figure 1 Shown is a coil arrangement 10 with a cylindrical sensor coil 12 , an air-core coil (in this example) and a likewise cylindrical compensating coil 14 . The sensor coil 12 and the compensation coil 14 are coaxially wound on a common carrier 16 made of non-magnetic material with a specific distance from each other. At the end of the sensor 12 opposite the compensating coil 14 is shown the end of a ferromagnetic plunger 18 which moves in the axial direction of the coil arrangement and which penetrates the sensor coil 12 a certain distance S max ,Such as figure 1 shown by the dotted line in . The plunger 18 affects the inductance of the sensor coil 12 such that, by measuring this inductance, the change from the original position of the plunger 18, i.e. figure 1 The solid line shown in , travels the path to the interior of the sensor coil.

[0021] The sensor 12 surrounds a certain annular area A1. The turns of the compensation coil 14 are situated radially out...

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PUM

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Abstract

The measuring device has a measuring plunger (18) that is relatively movable with respect to a measuring coil (12). A measuring circuit measures path of the plunger based on inductance of the coil, and an electronic evaluation and control unit calculates distance traveled by the plunger as a function of the measured inductance. A temperature sensor measures temperature of the plunger and the control unit adjusts temperature of the plunger based on the measured inductance.

Description

technical field [0001] The invention relates to an inductive path measuring device having: a sensor coil; a plunger movable relative to the sensor coil; a measuring circuit for measuring the inductance of the sensor coil according to the path of the plunger; and an electronic processing and control unit for calculating the path that the plunger has traveled from the measured inductance. [0002] More precisely, the invention relates to a path measuring device in a gear sensor of a motor vehicle. Background technique [0003] WO 2010 / 006781 A1 describes a gear sensor for detecting the current gear of a transmission. In this sensor, a plunger is mechanically connected to a stop member elastically biased with respect to a shift shaft of a transmission, and checks a selector relief formed on the shift shaft. Thus, the shift shaft movement is converted into an axial movement of the plunger, which can be detected by a measuring device. From the measured plunger path, it is poss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/22G01D5/20G01K7/36
CPCG01D5/2013G01D3/0365
Inventor R·孟肯米勒
Owner ROLLAX GMBH & CO KG
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