The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1985
Filed:
Mar. 22, 1983
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A method for detecting the oxygen concentration of a gas to be measured is disclosed using the limiting current type oxygen sensor. The method is characterized in that the relationship of an inclined straight line between the voltages applied to the oxygen sensor and the currents outputted therefrom is determined in such a manner that the inclined straight line may pass through the flat portions of the limiting current in the voltage-current characteristics curves at the different oxygen concentrations. The relationship between the outputted currents and the oxygen concentrations at the flat portion is such that when a given magnitude of voltage is applied to the oxygen sensor to cause it to output a current, a voltage which corresponds to this current at the inclined straight line is determined. The voltage thus determined is applied to the oxygen sensor to cause it to output a current. The oxygen concentration is determined from the current thus outputted with reference to the outputted current-oxygen concentration conversion straight line. There is also disclosed a method for controlling the air-to-fuel ratio of a gas from an engine using the above voltage-current characteristic curves, inclined straight line and outputted current-oxygen concentration.