Method and apparatus for attenuating fuel pump noise in a direct injection internal combustion chamber

USRE43864E1 · kind E1 · reissue

Assignee

• HITACHI, LTD. · JP

Inventors

• Atsushi Watanabe · Yamanashi, JP
• Harsha Badarinarayan · Novi, US
• Jonathan Borg · Erding, DE
• Donald J. McCune · Farmington Hills, US
• Takuya Shiraishi · Hitachinaka, JP
• Atsushi Hohkita · Novi, US
• Masahiro Soma · Novi, US
• Hiroaki Saeki · Ibaraki, JP

Key dates

• Filing date: Aug 4, 2010
• Grant date: Dec 18, 2012
• Expiry date: Aug 4, 2030

Classification

• Technology area (CPC —): General

Abstract

A method and apparatus for attenuating fuel pump noise in a direct injection internal combustion engine. In one proposal, the direct injection fuel nozzle is suspended from a fuel rail in a fashion that avoids direct metal-to-metal contact between the injector and the engine block. The direct injection nozzle may also be connected to the fuel rail by a pair of spaced-apart seals which equalize the longitudinal pressure on the nozzle during operation. Enlarged diameter fuel reservoirs and/or a restricted orifice may be provided fluidly in series between the fuel pump and the direct injection nozzle in order to attenuate noise resulting from fuel pump pulsation.