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, 1978
Filed:
Feb. 10, 1977
Giampaolo Garcea, Milan, IT;
Alfa Romeo S.p.A., Milan, IT;
Abstract
This invention relates to an automatic device for controlling the pressure of the intake air of an internal combustion engine as its operating altitude varies. The device according to the invention comprises first valve means adapted to keep the air pressure downstream of the said valve means substantially constant and equal to the external pressure corresponding to a predetermined altitude, first actuator means which control said first valve means as a function of an operating pressure which varies with the altitude and reaches at said predetermined altitude a value equal to the substantially constant value downstream of the first valve means, and second valve means controlled by second actuator means sensitive to an absolute pressure which is a function of the external atmospheric pressure, said second valve means being able to modulate said operating pressure.