Gas concentration measuring apparatus with multiple amplification ranges

A gas concentration measuring apparatus for use in air-fuel ratio control of automotive engines is designed to determine the concentration of oxygen within a wide and a narrow range using a sensor current flowing through a sensor element (10). The apparatus includes an amplifier circuit (38) equippe...

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Bibliographic Details
Main Authors Hada, Satoshi, Akimoto, Katsuhide, Kurokawa, Eiichi, Kawase, Tomoo, Suzuki, Toshiyuki
Format Patent
LanguageEnglish
French
German
Published 26.07.2017
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
LIGHTING
MEASURING
MECHANICAL ENGINEERING
PHYSICS
TESTING
WEAPONS
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Summary:A gas concentration measuring apparatus for use in air-fuel ratio control of automotive engines is designed to determine the concentration of oxygen within a wide and a narrow range using a sensor current flowing through a sensor element (10). The apparatus includes an amplifier circuit (38) equipped with an operational amplifier (39) and a plurality of amplifying resistors (41,42,43) and a switch (44). The switch (44) is responsive to a request signal to switch a relation in electrical connection between the operational amplifier (39) and the amplifying resistors to distribute the amplifying resistors into an input resistor (41,42) and a feedback resistor (42,43) for the operational amplifier to change an amplification factor of the amplifier circuit. This results in a change in resolution of measurement of the concentration of oxygen, thereby ensuring enhanced accuracy in determining the concentration of oxygen in a selected one of the narrow and wide ranges.
Bibliography:Application Number: EP20070106934