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:
Jul. 30, 1985
Filed:
Jan. 25, 1984
Shigeo Aono, Tokyo, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
The present invention features a method of calibrating a pressure sensor disposed in an internal combustion engine which is characterized by delaying the ignition until combustion pressure is not generated during the compression stroke, recording the pressure history and mathematically deriving the essentially symmetrical half of the motoring pressure wave which occurs within the combustion chamber during the expansion stroke thereby obtaining the total motoring pressure history irrespective of the generation of combustion pressure. This data permits the output of the pressure sensor to be frequently compared with predetermined motoring pressure values for the same amount of inducted air and thus the value assigned to the output of the sensor to be adjusted to allow for the physical changes which occur within the sensor with temperature and age.