Bosch Automotive Systems Corporation

Bosch Corporation

Toshifumi Noda

Shinya Nozaki

Daijo Ushiyama

Yukihiro Hayasaka

Teruaki Ishikawa

Hiroshi Oikawa

An existing diesel engine vehicle of light oil fuel is enabled to run as a diesel engine vehicle using DME as fuel without exchanging a whole diesel engine and at very low cost and easily. The shape of a tip partof a needle valveis set by a center diameter Lfor regulating a minimum flow path area at full lift of a fuel injection nozzle, a seat diameter Lof a seat partcoming in contact with a valve seat partand blocking communication with a fuel injection hole, and a shaft diameter L, and a tip end angle is about 92 degrees. The center diameter Lis set to &#x3c6;2.5 mm, the seat diameter Lis set to &#x3c6;3.0 mm, and the shaft diameter Lis set to &#x3c6;3.25 mm. The ratio of the center diameter Land the seat diameter Lis L/L=2.5 mm/3.0 mm=about 0.833, and the ratio of the seat diameter Land the shaft diameter Lis L/L=3.0 mm/3.25 mm=about 0.92.

Fuel injection nozzle for DME fuel, and diesel engine including the fuel injection nozzle for DME fuel

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.

Liquefied gas-fuel supply device for diesel engine

A bypass controller () controls ON/OFF of a three-way electromagnetic valve () according to a detection value of a cam chamber sensor (). When the cam chamber sensor () detects a viscosity of lubricant exceeding a predetermined allowable value, the three-way electromagnetic valve () is controlled to turn ON so that the output side of an oil separator () communicates with a bypass route (). The pressure in the cam chamber () is reduced to or below the atmospheric pressure by suction of a compressor () with a check valve () regulating the pressure in the cam chamber () to the atmospheric pressure or above in the bypassed state. When the detection value of the viscosity of the lubricant output by the cam chamber sensor () has become the predetermined allowable value or below, the three-way electromagnetic valve () is controlled to turn OFF so that the output side of the oil separator () communicates with the check valve () and the bypass route () is cut off.

Diesel engine DME fuel supply device

In an injection pump element, a communication route for communicating an injection pipeconnected to a fuel liquid outletand an inner peripheral surface of a plunger barrelis formed by a purge passageformed in a delivery valve seat, a purge passageformed in the plunger barrel, and a purge port. When the injection pump elementis in a non-injection state, the plungeris rotated circumferentially to such a rotational position that a purge grooveformed in an outer peripheral surface of the plungerand a purge portformed in an inner peripheral surface of the plunger barrelare communicated to each other. The purge grooveis communicated to a fuel galleryvia a holeand a notch. When the injection pump elementis in the non-injection state, the injection pipeis communicated to the fuel galleryeven if the delivery valveis closed.

Growing community of inventors

Higashimatsuyama, Japan

Toshifumi Noda