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:
Aug. 22, 1978
Filed:
Apr. 01, 1977
Leonard Lee Chapin, El Paso, TX (US);
James Walter Merrick, El Paso, TX (US);
Autotronic Controls, Corp., El Paso, TX (US);
Abstract
An auxiliary air control system controls the flow of air into the intake manifold of an internal combustion engine. The system controls flow through a valve bypassing the main throttle valve to maintain an appropriate rate of air flow. A manifold pressure signal is fed back to a control circuit for comparison with a manifold pressure reference and development of a manifold pressure control signal for positioning the bypass valve to admit air at a rate maintaining the manifold pressure at the reference pressure and thus avoid low manifold pressures as cause excessive emissions of pollutants. A signal indicative of rate of air flow is fed back to the controller for comparison with an air flow reference and development of an air flow control signal for positioning the bypass valve to admit air at a rate maintaining total air flow at the reference rate, as for engine idle. The control signals are applied to admit air at the greater of the two rates. The air flow reference may be controlled as a function of any or all of engine temperature, added load, main throttle opening and starting.