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. 12, 2005
Filed:
Oct. 02, 2002
Michihisa Nakamura, Shizuoka-ken, JP;
Michihisa Nakamura, Shizuoka-ken, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Abstract
To provide a method of processing intake air pressure signals for accurately detecting the engine load including the accelerating state and the intake air flow rate from the intake air pressure. Intake air pressure signals detected with an intake air pressure sensorare processed with a low-pass filter. The low-pass filter is set to cut off frequencies that are not higher than the frequency corresponding to the wavelength that is four times the length of a pressure guide pipeleading to the pressure sensorand to cut off frequencies that are not lower than the driving frequency of the intake valve, which eliminates electric noises and air column vibration occurring in the pressure guide pipeand makes it possible to obtain smooth and real changes in the intake air pressure commensurate with the strokes.