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:
Feb. 20, 2001
Filed:
Jan. 13, 2000
Jean-Louis Froment, Lyons, FR;
Cummins Wartsila S.A., Mulhouse, FR;
Abstract
The invention concerns a device for injecting fuel into a diesel engine using a pulsating flow pump for improving the fuel performance of the engines by controlling the beginning and the end of the injection. It comprises a device (,) controlling the closing and opening of the nozzle needle (,) provided with a discharge circuit (,′) controlled by an electrovalve (,) in branched connection between the high pressure supply conduit (,) and the low pressure return conduit (,). The discharge circuit (,′) comprises a discharge valve (,) whereof the opening and the closing are slowed down by a calibrated orifice (,). The discharge valve (,) located upstream of a discharge orifice (,) provided on the return conduit (,) enables to deviate part of the non-injected fuel flow towards the nozzle needle (,) to exert thereon a closing pressure. Consequently, this results in a better control over the opening and closing of the nozzle needle (,). A calibrated valve (,) ensures that the pressure in the discharge circuit (,) is maintained between two injections. During the injection cycle, the supply of fuel towards the nozzle needle (,) is not impeded by the control device (,) components. The invention is applicable to diesel engines using pulsating injection pumps.