JP2004027863A5

JP2004027863A5 -

Info

Publication number: JP2004027863A5
Application number: JP2002180878A
Authority: JP
Filing date: 2002-06-21
Publication date: 2005-07-07

Claims

An injection pump for sending DME fuel supplied from a fuel tank via a feed pipe to an injection pipe communicating with a fuel injection nozzle of a diesel engine by a predetermined amount at a predetermined timing;
DME fuel supply means for supplying the DME fuel in the fuel tank to the oil reservoir of the injection pump;
An oil reservoir fuel cooling device for cooling the DME fuel in the oil reservoir;
Oil reservoir chamber fuel temperature detecting means for detecting the temperature of the DME fuel in the oil reservoir chamber;
Based on the temperature of the DME fuel in the oil sump chamber, an oil sump fuel cooler controller that controls the oil sump fuel cooler so that the temperature of the DME fuel in the sump chamber becomes a substantially constant temperature. A DME fuel supply device for a diesel engine equipped with
The DME fuel in the oil sump chamber is sent to the oil sump chamber fuel cooling device disposed outside the oil sump chamber, cooled, and then returned to the oil sump chamber to return to the oil sump chamber. A DME fuel supply device for a diesel engine, comprising: an oil sump chamber fuel circulation means for cooling and circulating the DME fuel.

2. The oil reservoir chamber fuel circulation means according to claim 1, wherein the DME fuel in the oil reservoir chamber is circulated by a circulation pump using a cam of the injection pump as a driving force source. DME fuel supply device for a diesel engine.

3. The oil reservoir chamber fuel cooling device according to claim 1, wherein the DME fuel in the oil reservoir chamber is cooled by a cooling cycle using the DME fuel as a cooling medium, and the DME fuel is vaporized. A DME fuel supply device for a diesel engine, comprising a fuel cooler that cools the DME fuel in the oil sump chamber by utilizing the heat of vaporization generated.

4. The oil sump chamber fuel cooling device according to claim 3, wherein the DME fuel is supplied from the feed pipe, the DME fuel flowing through the cooling medium supply pipe is vaporized and sent to the fuel cooler. And a cooling medium supply pipe opening / closing electromagnetic valve for opening / closing the cooling medium supply pipe, and the control is performed by controlling the opening / closing of the cooling medium supply pipe opening / closing electromagnetic valve. DME fuel supply system for diesel engines characterized by

5. The oil separator according to claim 4, wherein the DME fuel mixed in the lubricating oil in the cam chamber is a dedicated lubricating system separated from the lubricating system of the diesel engine, and the DME separated by the oil separator. An electric compressor that pressurizes the fuel and sends the fuel to the fuel tank, and the DME fuel supplied from the cooling medium supply pipe to the oil reservoir fuel cooling device is sent to the fuel tank by the electric compressor. A DME fuel supply device for a diesel engine, characterized in that it comprises a configuration.

The DME fuel supply means according to any one of claims 1 to 5, wherein the DME fuel supply means pressurizes the DME fuel in the fuel tank to a predetermined pressure and sends it to the oil reservoir chamber, and overflows from the oil reservoir chamber. A DME fuel supply apparatus for a diesel engine, comprising: an overflow fuel pipe for returning the DME fuel to the fuel tank.

6. The DME fuel supply unit according to claim 1, wherein the DME fuel supply means determines the temperature of the DME fuel in the oil reservoir in the oil reservoir chamber fuel cooling device controller. A DME fuel for a diesel engine, characterized in that the DME fuel in the fuel tank is supplied to the oil reservoir chamber by a pressure difference between the oil reservoir chamber and the fuel tank generated by adjusting to a lower temperature. Feeding device.

8. The sub fuel tank having a capacity smaller than that of the fuel tank is provided between the fuel tank and the feed pipe. When the diesel engine is started, the fuel tank and the sub fuel tank are The DME fuel from the sub fuel tank whose gas phase portion is pressurized by the electric compressor by blocking the communication between the gas phase portion and the outlet side of the electric compressor. A DME fuel supply device for a diesel engine, characterized in that is configured to be supplied to the oil reservoir chamber.

9. The DME fuel supply device for a diesel engine according to claim 8, further comprising a fuel tank temperature adjusting means for adjusting the temperature in the fuel tank.

The fuel tank internal temperature control means according to claim 9, wherein the DME fuel sent from the electric compressor is cooled via an air-cooled cooler and then sent to the fuel tank; Switching between a second return path through which the DME fuel delivered from the electric compressor is delivered to the fuel tank without passing through the air-cooled cooler, the first return path, and the second return path Fuel tank temperature control for adjusting the temperature in the fuel tank by controlling the return path switching electromagnetic valve, the fuel tank temperature detecting means for detecting the temperature in the fuel tank, and the return path switching electromagnetic valve A DME fuel supply device for a diesel engine, characterized by comprising:

11. The structure according to claim 1, wherein the DME fuel delivered from the injection pump is supplied to a common rail and is delivered from the common rail to each fuel injection nozzle. DME fuel supply system for diesel engines.

A DME fuel supply device for a diesel engine configured such that DME fuel supplied from a fuel tank to an oil reservoir is supplied from the oil reservoir to a fuel injection nozzle of a diesel engine,
DME fuel supply means for supplying the DME fuel in the fuel tank to the oil reservoir,
An oil reservoir fuel cooling device for cooling the DME fuel in the oil reservoir;
Oil reservoir chamber fuel temperature detecting means for detecting the temperature of the DME fuel in the oil reservoir chamber;
Based on the temperature of the DME fuel in the oil reservoir chamber, an oil reservoir chamber fuel cooling device controller that controls the oil reservoir fuel cooling device so that the temperature of the DME fuel in the oil reservoir chamber becomes a substantially constant temperature. When,
The DME fuel in the oil sump chamber is sent to the oil sump chamber fuel cooling device disposed outside the oil sump chamber, cooled, and then returned to the oil sump chamber to return to the oil sump chamber. A DME fuel supply device for a diesel engine, comprising: an oil sump chamber fuel circulation means for cooling and circulating the DME fuel.