Bosch Automotive Systems Corporation

Bosch Corporation

Teruaki Ishikawa

Shinya Nozaki

Toshifumi Noda

Yukihiro Hayasaka

Daijo Ushiyama

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 () is controlled to be OFF to form a communication passage in the direction indicated by the arrow B and a two-way valve () is controlled to be ON. DME fuel delivered from a feed pump () is delivered to an aspirator (), passed from an inlet () to the outlet () thereof and returned to a fuel tank (). That is, the DME fuel circulates via the aspirator. A vapor-phase pressure delivery pipe switching solenoid valve () is controlled to be ON and opened so that flow can pass through a vapor-phase pressure delivery pipe () connecting the vapor-phase () in the fuel tank () and the inlet of the fuel gallery (). DME fuel in a liquid state remaining in the fuel gallery (), an overflow fuel pipes () and () is delivered under pressure to a suction port () by the high pressure of the vapor-phase ().

DME fuel supply device for diesel engine

Since an aspiratoris disposed at a position lower than a fuel galleryand an overflow fuel pipe, DME fuel remaining in the fuel galleryand the overflow fuel pipecan be more efficiently retrieved to a fuel tankby a combined force of gravity and suction force produced in a suction portof the aspirator. Since the vapor-phase pressure delivery pipe opening/closing solenoid valveis disposed at a position higher than the fuel gallery, DME fuel in a liquid state remaining in the fuel galleryand the overflow fuel pipeis forcedly delivered under pressure to the suction portof the aspiratorby a combined force of gravity and the pressure of a vapor phasein the fuel tank. Accordingly, time taken to retrieve the DME fuel in an injection system to the fuel tank after the stop of a diesel engine.

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Higashimatsuyama, Japan

Teruaki Ishikawa