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1. 发明专利

JPH04347359A FUEL INJECTION SYSTEM 失效
公开(公告)号：JPH04347359A
公开(公告)日：1992-12-02
申请号：JP11757991
申请日：1991-05-22
申请人： NIPPON DENSO CO
发明人： NISHIMAKI HIROAKI , OMORI TOSHIHIKO
IPC分类号： B01D29/01 , B01D35/02 , B01D39/12 , F02M57/02 , F02M59/44
摘要： PURPOSE:To provide such a fuel injection system as capable of improving the durability of a filter to be installed in space between a pressure-feed pump room and a fuel gallery. CONSTITUTION:A filter 8 consists of a small wire diameter and small hole central screen part installed at the central part, a large wire diameter and large hole fuel gallery side screen part connected to both side of the central screen part and a field chamber side screen part, and these lements are formed into an integral structure by means of resistance welding. This field chamber side screen part receives a spill wave, and this spill wave collides with the central screen part directly, thereby preventing this screen part from being deformed. A pressure-feed pump room 34 passes through a spill port 59 of an injection bore 50, upward spill passages 58, 38, a feed port 39, a downward spill passage, a feed changer 48 and a gallery interconnecting hole 49 in order and it is interconnected to a fuel gallery 102. The spill wave passes through the upward spill passages 58, 38, the feed port 39 and the downward passage in order and it acts on the filter 8 lying between the feed chamber 48 and the fuel gallery 102.

2. 发明专利

JPH04209962A FUEL INJECTION DEVICE 失效
公开(公告)号：JPH04209962A
公开(公告)日：1992-07-31
申请号：JP33900790
申请日：1990-11-30
申请人： NIPPON DENSO CO
发明人： OMORI TOSHIHIKO , NISHIMAKI HIROAKI
IPC分类号： F02M47/00 , F02M45/00 , F02M57/02
摘要： PURPOSE:To reduce NOx and noise without decreasing engine performance by setting an increasing rate of pressure in a pump chamber different in the beginning and the latter period of fuel injection so as to generate the pressure increasing rate lower in the beginning of injection and higher in the latter period of injection, and obtaining a rate of injection desired for an engine. CONSTITUTION:This fuel injection device 1 is constituted of a press-feed part 2 for press-feeding fuel, electromagnetic valve 3 for controlling an injection timing and an injection amount, nozzle 4 and an injection rate control part 5. The injection rate control part 5 is formed of a piston 14 fitted to a control cylinder 13 connected to a pump chamber 8, pressure chamber 15 formed in a point end side of the piston 14 and a communication path 16 for opening this pressure chamber 15 to a fuel route, and in the beginning of fuel injection, the piston 14 is pressed to a side of the pressure chamber 15 according to increasing a pressure in the pump chamber 8 to allow fuel in the pressure chamber 15 to flow out little by little through an orifice 20, so that the pressure in the pump chamber 8 is suppressed from increasing. In the latter period of fuel injection, the pressure in the pump chamber is increased by stopping the piston 14.

3. 发明专利

JPH0326854A ACCUMULATION TYPE FUEL INJECTION DEVICE OF DIESEL ENGINE 失效
公开(公告)号：JPH0326854A
公开(公告)日：1991-02-05
申请号：JP15923689
申请日：1989-06-21
申请人： NIPPON DENSO CO
发明人： NISHIMAKI HIROAKI
IPC分类号： F02D41/04 , F02B3/06 , F02D41/38
摘要： PURPOSE:To decrease pressure rising energy of a high pressure pump by maintaining common rail pressure at a level of pressure power upon judgement or by gradually decreasing it, when an engine load decreasing rate is judged less than a specified threshold value. CONSTITUTION:An electronic control unit 11 inputs signals from an engine speed sensor 11, an acceleration opening sensor 12, a real common rail pressure sensor 14, and respective kinds of sensors 15. The unit 11 also judges engine operation condition so as to control injection from an injector 2 by a solenoid valve 3, and controls the pressure of a common rail 4 by means of a discharge controller 10. When the load decreasing rate of an engine 1 is judged less than a specified threshold value, the pressure of the common rail 4 is maintained at a level of the pressure at the time of judgement for a specified time, or decreased gradually so as to control the discharge controller 10. In the case of increase in engine load, therefore, operation is made possible with the reduced pressure rising energy of a high pressure pump 7, and generation of vibration can be restrained.

4. 发明专利

JPS61164064A FUEL INJECTION DEVICE 失效
公开(公告)号：JPS61164064A
公开(公告)日：1986-07-24
申请号：JP633785
申请日：1985-01-16
申请人： NIPPON DENSO CO
发明人： OMORI TOSHIHIKO , TOMIJIMA HITOSHI , NISHIMAKI HIROAKI
IPC分类号： F02M51/00 , F02D41/00 , F02D41/08 , F02M57/02
摘要： PURPOSE:To prevent uneven intermittent injection by supplying fuel exceeding fuel amount to be injected to a pump chamber of an injection plunger in a injector in low speed and load of an engine to adjust fuel amount with a spill of a pump chamber in a pressure plunger. CONSTITUTION:This injector 12 has a pressure cylinder 51, injection cylinder 52 and nozzle body 53 arranged in series in a body 50. A pressure plunger 55 operated through a cam follower 56 is inserted in the pressure cylinder 51 to define a pressure pump chamber 56 below the sliding direction of the plunger. Also, an injection plunger 59 is inserted in the injection cylinder 52 to define an injection pump chamber 76 below the sliding direction of the plunger. An idle control chamber 154 is defined between the pressure cylinder 51 and the body 50, and the internal pressure in said chamber 154 is adjusted through an electromagnetic valve (not shown) in detecting idling so that the opening areas of a spill port 155 and fuel path 152 are varied to control injection amount.

5. 发明专利

JPH04164150A FUEL INJECTION DEVICE 失效
公开(公告)号：JPH04164150A
公开(公告)日：1992-06-09
申请号：JP28941790
申请日：1990-10-26
申请人： NIPPON DENSO CO
发明人： NISHIMAKI HIROAKI , OMORI TOSHIHIKO
IPC分类号： F02D1/08 , F02M57/02 , F02M59/10
摘要： PURPOSE:To improve dripping ability of fuel at injection and prevent occurrence of secondary injection by press-feeding the fuel from a press-feed pump chamber to a nozzle spring chamber while increasing a pressure in the nozzle spring chamber, and slowing fuel flow from the nozzle spring chamber by means of an orifice. CONSTITUTION:When a press-feed plunger 11 descends and a pressure in an injection pump chamber 30 reaches a nozzle opening valve pressure, a needle valve 44 is pressed up to start fuel injection from an injection port 46. After completion of the fuel injection, a pressure in a nozzle spring chamber is abruptly increased by fuel inflow into the nozzle spring chamber 34. The fuel, flowing out of the nozzle spring chamber 34 after completion of the fuel injection is flowed through a nozzle back pressure passage 50 to a drain port 33. The fuel flowing from the nozzle spring chamber 34 is restricted by means of an orifice 54, so that pressure decrease in the nozzle spring chamber 34 is moderated. It is thus possible to improve dripping ability of fuel at injection and prevent occurrence of secondary injection of the fuel.

6. 发明专利

JPH03134261A FUEL INJECTION DEVICE 失效
公开(公告)号：JPH03134261A
公开(公告)日：1991-06-07
申请号：JP27131589
申请日：1989-10-18
申请人： NIPPON DENSO CO
发明人： OMORI TOSHIHIKO , NISHIMAKI HIROAKI , DAIKU TAKEHIKO
IPC分类号： F02M57/02
摘要： PURPOSE:To make a low cost obtainable with structure simplified by cutting off communication between the first and second pressure chambers, when a shifting means is shifted in the axial direction synchronously with an internal combustion engine to close a communication path, so as to start fuel injection when the shifting means is further shifted to increase an internal pressure in the first pressure chamber to not less than the predetermined. CONSTITUTION:A press feed plunger 51 is driven from the top dead center to the bottom dead center by a cam synchronized with an engine, when the plunger 51 is shifted to the lower by a press stroke L, a spill passage 504 is closed by a side surface of the plunger 51. Consequently, communication between the inside of a pump chamber 52 and the inside of a spill chamber 54 is cut off, when the plunger 51 is further shifted to the lower, fuel in the pump chamber 52 is compressed in accordance with a shifting amount. Consequently, an internal pressure in the pump chamber 52 is increased in accordance with shifting the plunger 51, and fuel in the pump chamber 52 or the like is pressurized in proportion to a displacement amount of the plunger 51. A pressure of fuel in the pump chamber 52 or the like is increased by further shifting the plunger 51, when the internal pressure in the pump chamber 52 is increased to not less than the opening pressure of a nozzle 3, fuel injection is started from a jet hole 38.

7. 发明专利

JPS63150461A FUEL INJECTOR 失效
公开(公告)号：JPS63150461A
公开(公告)日：1988-06-23
申请号：JP29739886
申请日：1986-12-12
申请人： NIPPON DENSO CO
发明人： OMORI TOSHIHIKO , TOMIJIMA HITOSHI , NISHIMAKI HIROAKI , KANAMORI HIROYASU
IPC分类号： F02M57/02
摘要： PURPOSE:To enable a solenoid valve to be positively kept in the closed condition under a high injection pressure by making fuel pressure in an outlet passage act on a bearing surface as a pressure for urging a valve body to rest on a seat, and forming at an end of the valve body apart from the outlet passage a back pressure chamber to hold pressure for removing the valve body from the seat. CONSTITUTION:If no electric signal is transmitted from a control circuit to an electromagnetic coil 30 of a solenoid valve 23, a valve body 27 is forced upward by a spring 28, so that a large diameter portion 272 of the valve body 27 rests on a valve seat 40 to close an outlet passage 43. Therefore, fuel in a force feed pump chamber of a unit injector is pressurized, so that fuel is injected through a nozzle. Fuel fed under pressure through the cylinder outlet passage into a pressure chamber 32 acts on a bearing surface 274 of the valve body 27, so that the valve body 27 is urged to rest on the seat. The bearing surface area of the bearing surface 274 of the valve body 27 where the valve body 27 rests on the seat is formed larger than that of the other end surface 275 so as to conform the inner pressure in the pressure chamber 32 with that in the back pressure chamber 35.

8. 发明专利

JPS62267546A FUEL INJECTION FACTOR CONTROL METHOD FOR DIESEL ENGINE 失效
公开(公告)号：JPS62267546A
公开(公告)日：1987-11-20
申请号：JP11321686
申请日：1986-05-16
申请人： NIPPON DENSO CO
发明人： YAMADA YASUO , NISHIMAKI HIROAKI , MASUDA AKIRA
IPC分类号： F02D41/38 , F02B3/06 , F02D41/00
摘要： PURPOSE:To reduce the generation of noise during low load running, by a method wherein the injection factor of feed fuel is controlled in response to a combustion noise detecting signal. CONSTITUTION:When it is decided by a controller 16 that a diesel engine 10 is in an idle running state, a final pilot injection control timing T, obtained by correcting a fundamental pilot injection control timing, responding to the number of revolutions, depending upon a cooling water temperature, is computed to drive a pilot injection device 14. Thereafter, at a point of time when a given time lapses, the pilot injection control timing T is staggered by DELTAT to the lead angle side or the angle of delay side, integrated values of combustion noise detected by combustion noise sensors 15 at each point of time are compared with each other. A fundamental pilot injection control timing is corrected by DELTAT in a direction in which the discriminated noise is decreased. Since this constitution enables the pilot injection control timing to be corrected so that it approaches an optimum value changed due to a change with time of a device, the generation of noise during idle running can be reduced.

9. 发明专利

JPS62129540A FUEL INJECTION DEVICE FOR DIESEL ENGINE 失效
公开(公告)号：JPS62129540A
公开(公告)日：1987-06-11
申请号：JP27014085
申请日：1985-11-29
申请人： NIPPON DENSO CO
发明人： SUZUKI YUTAKA , YASUURA NOBUSHI , MASUDA AKIRA , NISHIMAKI HIROAKI
IPC分类号： F02D41/04 , F02B3/06 , F02D1/02 , F02D41/00 , F02D41/38 , F02D41/40 , F02M51/04
摘要： PURPOSE:To enable high accurate pilot injection to be performed, by providing a free piston mechanism communicating with a high pressure chamber of a fuel injection pump and controlling action of a free piston of said free piston mechanism by a solenoid operated unit synchronously with a delivery stroke of the fuel injection pump. CONSTITUTION:A plunger 48 performs reciprocating motion and rotary motion in accordance with rotation of a pump driving shaft 41, and a fuel injection pump 5 inducts fuel into a high pressure chamber 56 to be pressurized thereafter distributively supplied to each fuel injection value via a passage or the like in the plunger 48 by its action. Here the fuel injection pump is equipped with a free piston mechanism 80 for variably controlling the volume of the high pressure chamber 56. This free piston mechanism 80 is constituted of a free piston 82 fitting it into a cylinder 81 communicating with the high pressure chamber 56, and action of said piston 82 is restricted by a solenoid operated unit 70. And the solenoid operated unit 70 controls its electrifying timing by a control circuit 2 synchronously with a delivery stroke of the injection pump, in this way, a pilot injection quantity is adjusted.

10. 发明专利

JPH04265466A FUEL INJECTION DEVICE 失效
公开(公告)号：JPH04265466A
公开(公告)日：1992-09-21
申请号：JP4763991
申请日：1991-02-19
申请人： NIPPON DENSO CO
发明人： OMORI TOSHIHIKO , NISHIMAKI HIROAKI
IPC分类号： F02M59/10
摘要： PURPOSE:To facilitate machining of component parts for preventing a fuel injection device from coming out of a plunger, minimize the number of the component parts, and facilitate assembling work of the component parts. CONSTITUTION:A follower 17 which is inserted in a cylindrical guide pipe 25 formed into an injection device body 15 so that it may slide reciprocatingly is connected to a plunger 16 which is installed in the axial direction of the injection device body 15 so that it may slide reciprocatingly and is interlocked with the cam shaft of an internal combustion engine for reciprocating. The fuel whose injection amount and injection timing are adjusted is injected from a nozzle part 13 by the pressurizing action of the plunger 16. A compression coil spring 28 inserted in the outer periphery of the guide pipe 25 energizes the follower 17 in its coming-off direction. The under plate 32 of a follower coming-off preventing member 30 is constructed so as to be locked in a ring groove 35, and a hook 33 is constructed so as to be locked on the top surface of the follower 17.

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