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Method and system for driving a capacitive sensor

A technology of capacitive sensors and capacitors, used in radio wave measurement systems, electrical/magnetic exploration, instruments, etc.

Inactive Publication Date: 2017-02-22
MAGNA CLOSURES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] One problem with such capacitive sensors involves their sensing range

Method used

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  • Method and system for driving a capacitive sensor
  • Method and system for driving a capacitive sensor
  • Method and system for driving a capacitive sensor

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Embodiment Construction

[0025] In the following description, details are set forth to provide an understanding of the present invention. In some instances, certain circuits, structures and techniques have not been described or shown in detail in order not to obscure the invention.

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed; that example embodiments may be embodied in many different forms; and that neither example embodiment should be construed to limit the scope of the disclosure. In some example embodiments, well-known ...

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Abstract

A method for determining a capacitance value of a capacitive sensor begins by applying a sensor signal (Vx) to the capacitive sensor. The sensor signal (Vx) includes a number of charge-discharge pulse pairs distributed over a first period of time (T / N), with each pulse pair having a different pulse period. The method then proceeds by accumulating a number (N) of samples of a reference voltage (Vs) measured across a reference capacitor (Cs) that is coupled to the capacitive sensor over a second period of time (T) to produce an accumulated capacitance value (ACCUMULATED). The accumulated capacitance value (ACCUMULATED) is then divided by the number (N) of the samples to determine the capacitance value (Cx) of the capacitive sensor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 954,005, filed March 17, 2014. The entire disclosure of the above application is incorporated herein by reference. technical field [0003] The present invention relates generally to the field of capacitive sensors and, more particularly, to methods and systems for driving capacitive sensors for use in vehicles and other devices. Background technique [0004] This section provides background information related to the present disclosure which is not necessarily prior art. [0005] In motor vehicles such as minivans, sport utility vehicles, etc., it has become common practice to provide the body with a large rear opening. Typically, a liftgate (also known as a tailgate) is mounted to the body or chassis with hinges for pivotal movement of the liftgate about a laterally extending axis between an open position and a closed position. Typically, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26E05F15/46G01V3/08
CPCE05Y2900/546E05F15/46G01V3/08G01V3/088E05F15/73
Inventor 米尔科·普里比希奇艾伦·科尔纳胡小平迈克·阿克巴里蒂莫西·德佐齐
Owner MAGNA CLOSURES INC