Abstract
In contrast to the existing electromechanical systems, the noncontact‐type capacitive measurement allows for a chemically and mechanically isolated, continuous, and inherently wear‐free measurement. Integration of the sensor directly into the container’s wall offers considerable savings potential because of miniaturization and installation efforts. This paper presents the implementation of noncontact (NC)‐type level sensing techniques utilizing the Programmable System on Chip (PSoC). The hardware system developed based on the PSoC microcontroller is interfaced with capacitive‐based printed circuit board (PCB) strip. The designer has the choice of placing the sensors directly on the container or close to it. This sensor technology can measure both the conductive and nonconductive liquids with equal accuracy.
Highlights
Nowadays, all automotive vehicles are fitted with a fuel-level sensor
Manufactures in the automobile industry need novel solutions for the longevity of fuel-level sensors. e novel solutions should reduce cost, space, and weight and enhance the reliability of fuel sensors. e fuel-level sensor can sense numerous liquid in the automobile industry such as cooling water, windshield cleaning engine oil, and power steering fluid. e noninductive, capacitance-based sensor is capable of estimating the level of conducting as well as nonconducting fluids. e level sensor checks the fluid level in tanks
Several methods are available to convert the capacitance into analog voltages. e popular techniques used in capacitance-to-analog voltage converters are transimpedance amplifier and an alternating current (AC) bridge with voltage amplifier. e limitations of these techniques are low sensitivity and nonidealities of the sensor
Summary
All automotive vehicles are fitted with a fuel-level sensor. It measures the quantity of fuel left in the fuel tank. In paper [2], noncontact capacitance-type level sensors for conductive fluids are discussed. E paper [11] presents a measurement system that has been developed using a single-tube capacitive sensor to determine the fluid level in vehicular fuel tanks which addresses the effect of fuel sloshing due to vehicle acceleration. E paper [34] discusses the fluid level measurement structure founded on energetic pipe pressure conventional for high-temperature corrosive molten salts. E most common mechanical variation encountered is a change in the distance between capacitor plates, where the first plate is the sensor and the second plate is the liquid surface It is triggered through air-bubbles present in the adhesive. Even though capacitive level sensing is a familiar technique, it is not used in automotive applications because of its sensitivity to the conductivity of the fluid and variations in dielectric constant.
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