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:
Jun. 10, 1980
Filed:
Jun. 30, 1978
Koichiro Yamada, Ibaraki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A recirculation duct with a check valve is connected to an exhaust duct communicating with the engine and a turbine of a turbocharger and an delivery duct communicating with the engine and compressor of the turbocharger. A branch duct is connected to the delivery tube upstream of the recirculation duct. In the branch duct, a control valve is provided for controlling a quantity of air flowing in the branch duct according to both a pressure in the exhaust duct and a pressure in the delivery duct downstream of the branch dust to lower the pressure in the delivery duct downstream of the branch duct thereby recirculating part of the exhaust gas. The control valve is provided with a dashpot and push rods, and driven by an accelerator when the engine runs at high load. The dashpot damper a rapid movement of the control valve made by the accelerator.