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. 08, 1988
Filed:
Jul. 16, 1986
Katsunori Terasaka, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An air/fuel ratio sensor having a sensor section and a pump section, capable of accurately sensing air/fuel ratio and an air/fuel ratio detecting and controlling apparatus by utilizing the air/fuel ratio sensor in which the accuracy of air/fuel ratio detection and control can be improved by varying the number of cylinders into which fuel is injected in a multi-step manner, during engine deceleration while maintaining the amount of fuel injected into each cylinder at a constant level, by determining whether the air/fuel ratio sensor operation is normal or abnormal on the basis of the air/fuel ratio sensor output level when fuel injection is performed into all of the cylinders, the output sensor level when fuel injection is performed only into specific cylinders, and the sensor output level when fuel injection to all cylinders is halted. A method of detecting an abnormal condition of the air/fuel ratio sensor is also disclosed and a suitable correction of the air/fuel ratio is also performed in accordance with the result of the conditions of the sensor.