JP2004068674A5

JP2004068674A5 -

Info

Publication number: JP2004068674A5
Application number: JP2002227493A
Authority: JP
Filing date: 2002-08-05
Publication date: 2005-06-02
Anticipated expiration: 2022-08-05

Description

本願請求項１１に記載の発明は、請求項１〜１０のいずれか１項において、前記インジェクションポンプから送出された前記ＤＭＥ燃料は、コモンレールへ供給され、該コモンレールから各燃料噴射ノズルへ送出される構成を成している、ことを特徴としたディーゼルエンジンのＤＭＥ燃料供給装置である。
本願請求項１１に記載の発明に係るディーゼルエンジンのＤＭＥ燃料供給装置によれば、コモンレール式ディーゼルエンジンのＤＭＥ燃料供給装置において、前述した本願請求項１〜１０のいずれか１項に記載の発明による作用効果を得ることができる。
本願請求項１２に記載の発明は、ディーゼルエンジンの駆動力が伝達されて動作し、燃料タンクからディーゼルエンジンの燃料噴射ノズルへＤＭＥ燃料を加圧送出する際の駆動力源となるカム機構を有するカム室と、該カム室内に混入したＤＭＥ燃料と該カム室内の潤滑油とを分離可能なオイルセパレータと、該オイルセパレータにて分離したＤＭＥ燃料を燃料タンクへ回収するための連通路と、該連通路に配設され、前記オイルセパレータを介して前記カム室内の気相部を吸引する吸引手段と、前記連通路の前記吸引手段と前記オイルセパレータとの間に配設され、前記カム室内の圧力を一定の圧力以上に維持するカム室内圧力制限手段と、該カム室内圧力制限手段をバイパスして、前記カム室と前記吸引手段とを直接連通させるバイパス通路と、該バイパス通路を開閉するバイパス通路開閉手段とを備えたディーゼルエンジンのＤＭＥ燃料供給装置である。 In the invention according to claim 11 of the present invention, in any one of claims 1 to 10, the DME fuel delivered from the injection pump is supplied to a common rail and delivered from the common rail to each fuel injection nozzle It is a DME fuel supply device of a diesel engine characterized by having constituted.
According to the DME fuel supply device for a diesel engine according to the invention as set forth in claim 11 of the present application, in the DME fuel supply device for a common rail type diesel engine, the invention according to any one of the above-mentioned inventions according to the present invention An effect can be obtained.
The invention according to claim 12 has a cam mechanism which operates by transmitting the driving force of the diesel engine and which serves as a driving force source when pressurized delivery of DME fuel from the fuel tank to the fuel injection nozzle of the diesel engine is performed. A cam chamber, an oil separator capable of separating DME fuel mixed in the cam chamber and lubricating oil in the cam chamber, a communication passage for recovering the DME fuel separated by the oil separator to a fuel tank, A suction means disposed in the communication passage for suctioning the gas phase portion in the cam chamber via the oil separator, and disposed between the suction means in the communication passage and the oil separator Cam chamber pressure limiting means for maintaining pressure above a certain pressure, and bypass for directly communicating the cam chamber with the suction means by bypassing the cam chamber pressure limiting means And road, a DME fuel supply device for a diesel engine equipped with a bypass channel opening and closing means for opening and closing the bypass passage.

Claims

An injection pump for delivering DME fuel supplied from a fuel tank via a feed pipe to an injection pipe in communication with a fuel injection nozzle of a diesel engine by a predetermined amount at a predetermined timing;
An oil separator capable of separating DME fuel mixed in a cam chamber of the injection pump and lubricating oil in the cam chamber;
A communication passage for recovering DME fuel separated by the oil separator to the fuel tank;
Suction means disposed in the communication passage for suctioning the gas phase portion in the cam chamber via the oil separator;
A cam chamber pressure limiting unit disposed between the suction unit in the communication passage and the oil separator and maintaining the pressure in the cam chamber at a predetermined pressure or higher;
A bypass passage for directly communicating the cam chamber with the suction means by bypassing the cam chamber pressure limiting means;
A DME fuel supply device for a diesel engine, comprising: bypass passage opening / closing means for opening / closing the bypass passage.

The cam chamber state detection means according to claim 1, wherein at least one of viscosity of lubricating oil in the cam chamber, density of lubricating oil in the cam chamber, pressure in the cam chamber, and temperature in the cam chamber can be detected. ,
A DME fuel supply device for a diesel engine, comprising: bypass control means for controlling the opening of the bypass passage opening / closing means when the detected value detected by the cam chamber state detection means exceeds a predetermined allowable value.

The diesel engine according to claim 2, wherein the bypass control means controls the closing of the bypass passage opening / closing means when the detected value detected by the cam chamber state detection means becomes equal to or less than a predetermined allowable value. DME fuel supply system.

4. The method according to claim 2, wherein the bypass control means performs control to close the bypass passage opening / closing means after a predetermined time has elapsed since the detection value detected by the cam chamber state detection means exceeds a predetermined allowable value. DME fuel supply system for diesel engines characterized by

The DME fuel supply device for a diesel engine according to any one of claims 1 to 4, further comprising: constant cycle bypass control means for opening and closing the bypass passage opening / closing means for a predetermined time period at a predetermined time period.

The fuel injection valve according to any one of claims 1 to 5, wherein the fuel injection valve is a delivery valve that can be opened and closed by a plunger that is engaged with a camshaft that receives rotation of a drive shaft of a diesel engine and rotates. The DME fuel in the oil reservoir supplied with the DME fuel from the tank via the feed pipe is pressurized at a predetermined timing by a predetermined amount to an injection pipe in communication with the fuel injection nozzle of the diesel engine The injection pump element is disposed on the sliding surface of the oil reservoir and the plunger barrel on which the plunger and the plunger are inserted from the upper portion of the plunger toward the cam chamber. The leaked liquid DME fuel leaks into the cam chamber And a DME fuel vaporization section for the space to be vaporized under reduced pressure to form the sliding contact surface between the plunger and the plunger barrel before leaving, that the diesel engine of the DME fuel supply device characterized by.

The DME fuel supply device for a diesel engine according to claim 6, wherein the space portion of the injection pump is formed by an annular groove formed in a circumferential direction on a circumferential surface of the plunger.

The DME fuel supply device for a diesel engine according to claim 6, wherein the space portion of the injection pump is formed by an annular groove formed in an inner circumferential surface of the plunger barrel in a circumferential direction.

9. The DME fuel supply device for a diesel engine according to claim 7, wherein the injection pump has the DME fuel vaporizing portion having a plurality of the annular grooves.

10. The injection pump according to any one of claims 6 to 9, wherein the DME fuel vaporization unit is formed such that the space portion is closer to the cam chamber of a sliding contact surface between the plunger and the plunger barrel. DME fuel supply device for diesel engines characterized by

The DME fuel delivered from the injection pump according to any one of claims 1 to 10, wherein the DME fuel is supplied to a common rail, and is delivered to each fuel injection nozzle from the common rail. DME fuel supply system for diesel engines.

A cam chamber having a cam mechanism serving as a driving force source when the driving force of the diesel engine is transmitted to operate and pressurize and deliver DME fuel from the fuel tank to the fuel injection nozzle of the diesel engine;
An oil separator capable of separating DME fuel mixed in the cam chamber and lubricating oil in the cam chamber;
A communication passage for recovering DME fuel separated by the oil separator to a fuel tank;
Suction means disposed in the communication passage for suctioning the gas phase portion in the cam chamber via the oil separator;
A cam chamber pressure limiting unit disposed between the suction unit in the communication passage and the oil separator and maintaining the pressure in the cam chamber at a predetermined pressure or higher;
A bypass passage for directly communicating the cam chamber with the suction means by bypassing the cam chamber pressure limiting means;
A DME fuel supply device for a diesel engine, comprising: bypass passage opening / closing means for opening / closing the bypass passage.