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:
Jan. 29, 1980
Filed:
Mar. 15, 1978
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A feedback control system for controlling the flow rate of a gas which is either drawn from or introduced into an exhaust passage of an internal combustion engine for the purpose of lessening pollutants in the exhaust gas. The control system is embodied either as an exhaust gas recirculation control system or a secondary air injection control system and in either case comprises an electrically operated flow control valve, a control circuit to provide a control signal to the control valve based on input signals representing the engine operating condition so as to establish an optimum flow rate, and an electrostatic type flow rate detector which has the ability of forming ions in the gas to provide a feedback signal on an electrical principle.