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:
Dec. 05, 2000
Filed:
Dec. 17, 1997
Nobuyuki Shibagaki, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The elapsed time Ta(i) of 30.degree. crank angle near top dead center of compression and the elapsed time Tb(i) of 30.degree. crank angle near 90.degree. after top dead center of compression are found. The difference DTa(i) of the elapsed times Ta(i) between 720.degree. crank angle for a first cylinder and a second cylinder performing combustion after the first cylinder is found. The assumed elapsed time when assuming that there is no torque fluctuation is calculated from the difference DTa(i) of the elapsed time of the first cylinder and the elapsed time of the second cylinder is calculated and the assumed elapsed time is used to calculate the amount of torque fluctuation. It is judged if the vehicle is driving over a rough road from the amplitude and cycle of fluctuation of the vehicle speed. When it is judged that the vehicle is driving over a rough road, correction of the air-fuel ratio based on the amount of torque fluctuation is prohibited.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile