Dme fuel supply device for diesel engine

• Main Authors: NOZAKI SHINYA, NODA TOSHIFUMI, USHIYAMA DAIJO, ISHIKAWA TERUAKI, HAYASAKA YUKIHIRO
• Format: Patent
• Language: English
• Published: 07.07.2005
• Edition: 7
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

In the DME fuel supply device for a diesel engine, the time necessary to retrieve DME fuel remaining in the injection system after stopping the diesel engine into the fuel tank can be reduced. In a non-injection state, a three-way valve ( 71 ) is controlled to be OFF to form a communication passage in the direction indicated by the arrow B and a two-way valve ( 72 ) is controlled to be ON. DME fuel delivered from a feed pump ( 5 ) is delivered to an aspirator ( 7 ), passed from an inlet ( 7 a) to the outlet ( 7 b) thereof and returned to a fuel tank ( 4 ). That is, the DME fuel circulates via the aspirator. A vapor-phase pressure delivery pipe switching solenoid valve ( 75 ) is controlled to be ON and opened so that flow can pass through a vapor-phase pressure delivery pipe ( 73 ) connecting the vapor-phase ( 4 a) in the fuel tank ( 4 ) and the inlet of the fuel gallery ( 11 ). DME fuel in a liquid state remaining in the fuel gallery ( 11 ), an overflow fuel pipes ( 8 ) and ( 9 ) is delivered under pressure to a suction port ( 7 c) by the high pressure of the vapor-phase ( 4 a).