JP2004044574A5

JP2004044574A5 -

Info

Publication number: JP2004044574A5
Application number: JP2003019256A
Authority: JP
Filing date: 2003-01-28
Publication date: 2005-07-21
Anticipated expiration: 2023-01-28

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;
An overflow fuel pipe for returning the DME fuel overflowed from the injection pump to the fuel tank; a nozzle return pipe for communicating the DME fuel overflowed from the fuel injection nozzle to the overflow fuel pipe;
A diesel engine comprising: a residual fuel recovery means capable of recovering the DME fuel remaining in the oil reservoir, the nozzle return pipe, and the overflow fuel pipe to the fuel tank after the diesel engine is stopped. DME fuel supply apparatus of
An oil separator that separates the DME fuel mixed in the lubricating oil in the cam chamber of the injection pump that is a dedicated lubricating system separated from the lubricating system of the diesel engine;
A compressor that pressurizes the DME fuel separated by the oil separator and delivers the fuel to the fuel tank;
A low-pressure tank disposed between the oil separator and the compressor;
A purge pipe communicating the low pressure tank and the overflow fuel pipe;
And a said purge pipe that open purge pipe off solenoid valve, DME fuel supply device for a diesel engine characterized in that.

2. The check valve according to claim 1, wherein a check valve that holds the pressure on the oil separator side and prevents the DME fuel from flowing backward from the low pressure tank to the oil separator side is provided between the oil separator and the low pressure tank. A DME fuel supply device for a diesel engine, characterized by being arranged in

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;
An overflow fuel pipe for returning the DME fuel overflowed from the injection pump to the fuel tank; a nozzle return pipe for communicating the DME fuel overflowed from the fuel injection nozzle to the overflow fuel pipe;
A diesel engine comprising: a residual fuel recovery means capable of recovering the DME fuel remaining in the oil reservoir, the nozzle return pipe, and the overflow fuel pipe to the fuel tank after the diesel engine is stopped. DME fuel supply apparatus of
An oil separator that separates the DME fuel mixed in the lubricating oil in the cam chamber of the injection pump that is a dedicated lubricating system separated from the lubricating system of the diesel engine;
A compressor that pressurizes the DME fuel separated by the oil separator and delivers the fuel to the fuel tank;
A low pressure tank connected to the inlet of the compressor;
A purge pipe communicating the low pressure tank and the overflow fuel pipe;
A DME fuel supply device for a diesel engine, comprising: a purge pipe open / close solenoid valve capable of opening and closing the purge pipe.

4. The DME fuel supply device for a diesel engine according to claim 3, wherein a check valve for holding the pressure in the low-pressure tank is disposed between the compressor and the low-pressure tank.

5. The DME fuel remaining in the oil sump chamber, the nozzle return pipe, and the overflow fuel pipe by the residual fuel recovery means after stopping the diesel engine according to claim 1. After performing the operation of recovering to the fuel tank for a predetermined time, the purge pipe opening / closing solenoid valve is opened, and the control to recover the DME fuel that could not be recovered by the residual fuel recovery means by the negative pressure of the low pressure tank is executed A DME fuel supply device for a diesel engine, comprising a DME fuel recovery control unit.

6. The gas phase pressure delivery pipe for connecting the inlet side of the oil reservoir chamber to which the feed pipe is connected and the gas phase in the fuel tank, and the gas phase according to any one of claims 1 to 5. A DME fuel supply device for a diesel engine, comprising: a gas-phase pressure delivery pipe opening / closing solenoid valve for opening and closing the pressure delivery pipe.

7. The DME fuel supply device for a diesel engine according to claim 6, wherein the gas phase pressure delivery pipe has a throttle portion in which an inner diameter of the gas phase pressure delivery pipe is partially narrowed.

8. The feed pump according to claim 7, further comprising a feed pump that pressurizes the DME fuel in the fuel tank to a predetermined pressure and sends the fuel to the feed pipe, wherein the residual fuel recovery means is provided between the feed pipe and the overflow fuel pipe. The DME fuel delivered from the feed pump is circulated as it is to the fuel tank by an aspirator disposed in the oil pump, and the DME fuel remaining in the oil reservoir and the overflow fuel pipe is circulated. A DME fuel supply device for a diesel engine, wherein the DME fuel is sucked into the DME fuel and collected into the fuel tank.

9. The first electromagnetic wave according to claim 8, wherein the residual fuel recovery means switches the communication outlet of the feed pipe to any one of an inlet side of the circulating flow path of the aspirator and an inlet side of the oil reservoir chamber. And a second solenoid valve that opens and closes between the suction port of the aspirator, the oil reservoir and the overflow fuel pipe, and the DME fuel recovery control unit, after stopping the diesel engine, The communication of the first electromagnetic valve is switched to the inlet side of the aspirator, the second electromagnetic valve is opened, and a flow path for circulating the DME fuel sent from the feed pump to the fuel tank is formed. The gas phase pressure delivery pipe opening / closing solenoid valve is opened, and control for closing only the gas phase pressure delivery pipe opening / closing solenoid valve is executed for a predetermined time after a lapse of a predetermined time. DME fuel supply device for a diesel engine.

10. The DME fuel supply for a diesel engine according to claim 9, wherein the DME fuel recovery control unit has means for opening the purge pipe opening / closing electromagnetic valve after closing the second electromagnetic valve. apparatus.

11. The supply fuel cooling device for cooling the DME fuel flowing in the feed pipe by a cooling cycle using the DME fuel as a cooling medium, and the temperature of the DME fuel in the injection pump according to any one of claims 1 to 10. And a temperature detecting means for detecting the temperature of the DME fuel sent to the injection pipe based on the temperature in the injection pump detected by the temperature detecting means. A DME fuel supply device for a diesel engine, comprising: a supply fuel temperature control unit that controls and controls a temperature of the DME fuel flowing through the feed pipe.

12. The supply fuel cooling device according to claim 11, wherein a fuel cooler using the DME fuel as a cooling medium, and a cooling medium supply pipe for supplying the DME fuel as the cooling medium from the fuel tank to the fuel cooler. A cooling medium supply pipe open / close solenoid valve capable of opening and closing the cooling medium supply pipe, and vaporizing the DME fuel by vaporizing the DME fuel flowing to the cooling medium supply pipe by the fuel cooler. The DME fuel flowing through the feed pipe is cooled using heat, and the supply fuel temperature control unit is controlled by opening / closing the cooling medium supply pipe opening / closing solenoid valve. DME fuel supply system for diesel engines.

13. The DME fuel supply device for a diesel engine according to claim 12, wherein the DME fuel vaporized by being supplied from the fuel tank to the fuel cooler is sent to the compressor.

14. The structure according to claim 1, wherein the DME fuel sent from the injection pump is supplied to a common rail and sent from the common rail to each fuel injection nozzle. DME fuel supply device for diesel engine.

A cam chamber configured to supply DME fuel from a fuel tank to a fuel injection nozzle of a diesel engine via an oil reservoir, and having a dedicated lubrication system separated from a lubrication system of the diesel engine;
  An overflow fuel pipe for returning the DME fuel overflowed from the oil reservoir chamber to the fuel tank; a nozzle return pipe for communicating the DME fuel overflowed from the fuel injection nozzle to the overflow fuel pipe;
  A diesel engine comprising: a residual fuel recovery means capable of recovering the DME fuel remaining in the oil reservoir, the nozzle return pipe, and the overflow fuel pipe to the fuel tank after the diesel engine is stopped. DME fuel supply apparatus of
  An oil separator that separates the DME fuel leaked from the oil reservoir into the cam chamber and mixed into the lubricating oil;
  A compressor that pressurizes the DME fuel separated by the oil separator and delivers the fuel to the fuel tank;
  A low-pressure tank disposed between the oil separator and the compressor;
  A purge pipe communicating the low pressure tank and the overflow fuel pipe;
  A DME fuel supply device for a diesel engine, comprising: a purge pipe open / close solenoid valve capable of opening and closing the purge pipe.

A cam chamber configured to supply DME fuel from a fuel tank to a fuel injection nozzle of a diesel engine via an oil reservoir, and having a dedicated lubrication system separated from a lubrication system of the diesel engine;
  An overflow fuel pipe for returning the DME fuel overflowed from the oil reservoir chamber to the fuel tank; a nozzle return pipe for communicating the DME fuel overflowed from the fuel injection nozzle to the overflow fuel pipe;
  A diesel engine comprising: a residual fuel recovery means capable of recovering the DME fuel remaining in the oil reservoir, the nozzle return pipe, and the overflow fuel pipe to the fuel tank after the diesel engine is stopped. DME fuel supply apparatus of
  An oil separator that separates the DME fuel leaked from the oil reservoir into the cam chamber and mixed into the lubricating oil;
  A compressor that pressurizes the DME fuel separated by the oil separator and delivers the fuel to the fuel tank;
  A low pressure tank connected to the inlet of the compressor;
  A purge pipe communicating the low pressure tank and the overflow fuel pipe;
  A DME fuel supply device for a diesel engine, comprising: a purge pipe open / close solenoid valve capable of opening and closing the purge pipe.