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Capacitance-based fluid level sensor

A technology of liquid level sensor and sensor, which is applied in the direction of liquid level indicator for physical variable measurement, and can solve the problem of no float type sensor

Inactive Publication Date: 2007-10-03
瓦尔克纽森制造美国有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Some electronic level sensors have been proposed and even implemented which do not have the disadvantages of float type sensors but existing electronic level sensors have their own problems

Method used

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  • Capacitance-based fluid level sensor
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  • Capacitance-based fluid level sensor

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Embodiment Construction

[0024] Two embodiments of a fill level sensor designed according to the invention will now be described in the form of an oil level sensor for use in a striker. Of course, it should be understood that many different embodiments of the invention are also conceivable, which can also be used as liquid level sensors in many other applications.

[0025] Referring now to the drawings, and initially to FIGS. 1-4 , there is shown a ram (sometimes referred to as a ram) 20 comprising a motor 22 and a ram subassembly 24 bolted to each other to form an integral unit. The ram subassembly 24 includes a ram crankcase 26 and a reciprocating tamping shoe 28 connected to the ram crankcase 26 by means of a reciprocating piston (not shown) for vertical vibration when the ram is in operation or reciprocating motion. The lower end of the piston is protected by a fixed housing 30 , while its upper end is protected by a flexible boot 32 which accommodates the movement of the base plate 28 relative t...

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Abstract

A fluid level sensor comprises a parallel plate capacitor coupled to an integrated circuit located in the bottom of an oil pan or other receptacle in which fluid level is being sensed. The sensor is preferably mounted on a drain plug for the receptacle. It includes an integrated circuit board encapsulated in a potting material disposed within the drain plug and a probe extending upwardly from the integrated circuit with its lower end also encapsulated with a resin such that its leads are protected by the resin encapsulating the integrated circuit. The probe may include one or more slotted plates in which capacitance bridges are formed within the slots or a plurality of parallel plates in which capacitance bridges are formed between adjacent plates. The sensor can be used to control operation of a gauge and / or an ignition control circuit for the machine's engine.

Description

technical field [0001] The present invention relates to a liquid level sensor, and more particularly to a sensor for detecting the liquid level of oil or other liquid in a container based on the change in capacitance between parallel plates of a parallel plate capacitor. This sensor is particularly suitable for use in machinery that is subject to severe vibrations or where float-type liquid level sensors cannot be used. [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 743,134, filed January 17, 2006, the entire contents of which are hereby expressly incorporated by reference into this application. Background technique [0003] In industrial and automotive applications, level sensors are widely used to detect the level of liquids in containers. For example, such sensors are commonly used to monitor the level of fuel in a fuel tank or the level of oil in an oil pan. These sensors typically include float-type sensors that include fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 查利·凯特尔霍恩罗伯特·齐姆普里克帕特·格里斯默
Owner 瓦尔克纽森制造美国有限责任公司
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