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:
May. 02, 1978
Filed:
Feb. 27, 1976
William J Roberts, Toledo, OH (US);
Eltra Corporation, Toledo, OH (US);
Abstract
An electronic vacuum modulator is disclosed for controlling air flow to a throttle valve modulator mechanism for limiting the maximum speed of an engine and, optionally, for also limiting the maximum vehicle speed. An electric signal having a frequency proportional to engine speed is converted into an electric signal which smoothly and progressively controls a solenoid valve as the engine speed increases over a narrow range at a predetermined maximum engine speed. The valve is controlled such that the modulator mechanism progressively closes a carburetor throttle valve in the engine to limit the engine speed by limiting the available power. Optionally, a vehicle speed signal also is converted into an electronic signal which smoothly and progressively controls the solenoid valve as the vehicle speed increases over a narrow range at a predetermined maximum vehicle speed.