FUEL INJECTION DEVICE FOR ENGINE

Japanese Patent JP3760572

B2

PROBLEM TO BE SOLVED: To prevent an initial fuel injection completely by forming a valve means for closing a back pressure passage for leading fuel supply pressure, which is formed at a back pressure chamber expanded or contracted according to the expansion or contraction of a magnetostrictive actuator as fuel supply pressure rises, at the back pressure passage.
SOLUTION: At the time of engine stopping, a piezo-actuator 10 contracts, so that the pressure of a fuel pressure chamber 3 and a back pressure chamber 8 drops and a needle valve 2 closes a nozzle hole 1a with a return spring 4. A spool valve 30 opens a back pressure passage 32 with the return spring. When a fuel pump is driven to start an engine, pump delivery pressure is led to the back pressure chamber 8 immediately, however, the pressure rise of the fuel pressure chamber 3 is delayed by the pressure rise of the back pressure chamber 8 through a second restriction passage 39, so that the needle valve 2 is forced in the valve-closing direction by the pressure difference between the fuel pressure chamber 3 and the back pressure chamber 8. It is thus possible to prevent an initial injection symptom that the needle valve 2 opens and fuel is injected before the engine starts.

Takayuki Arai
Takashi Fukuda
Masahiko Katsu
Shunji Oki

JP16879797A

March 29, 2006

June 25, 1997

Click for automatic bibliography generation  

Nissan Motor Co., Ltd

F02M51/06; F02M51/08; F16K3/26; H01L41/09; H01L41/12; (IPC1-7): F02M51/06; F02M51/08; F16K3/26; H01L41/09; H01L41/12

JP5099092A
JP62138860U

Masaki Goto
Yoshio Matsuda

Previous Patent: FORMATION OF ANTIFOULING THIN FILM

Next Patent: MANUFACTURING METHOD OF NOX SENSOR AND NOX SENSOR