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1. 发明专利

JP2003116287A PIEZOACTUATOR DRIVE CIRCUIT 审中-公开
公开(公告)号：JP2003116287A
公开(公告)日：2003-04-18
申请号：JP2001309498
申请日：2001-10-05
申请人： DENSO CORP , NIPPON SOKEN
发明人： ITO TOSHIHIKO , FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI
IPC分类号： F02M51/00 , F02D41/20 , F02M51/06 , H01L41/083 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To simplify the circuitry of a piezoactuator drive circuit for supplying energy stored in a capacitive element to a piezostack mounted on a piezoactuator through an energy relay means. SOLUTION: Without providing any extra capacitive element, each piezostack P1 -P4 is precharged with energy lower than a specified level capable of bringing each piezostack P1 -P4 into a specified operating state with the total energy of all piezostacks P1 -P4 exceeding a specified value. At the time of operation, switching elements SH1 -SH4 are turned on to discharge energy held in the piezostacks P1 -P4 to an energy relay means 22. Subsequently, the switching elements SH1 -SH4 are turned off and a switching element SL1 is turned on to discharge energy held in the energy relay means 22 to the piezostack P1 being operated.

2. 发明专利

JP2002138921A FUEL INJECTION DEVICE 失效
公开(公告)号：JP2002138921A
公开(公告)日：2002-05-17
申请号：JP2000339153
申请日：2000-11-07
申请人： DENSO CORP , NIPPON SOKEN
发明人： ITO TOSHIHIKO , FUKAGAWA YASUHIRO , MORITSUGU MICHIYASU , SAKAKIBARA YASUYUKI
IPC分类号： F02M47/00 , F02D41/20 , F02M47/02 , F02M51/00 , F02M51/06 , F02M55/02 , F02M63/00
摘要： PROBLEM TO BE SOLVED: To steadily reduce pressure of a common rail. SOLUTION: A valve 123 controls an outflow of fuel from a back pressure chamber 106 where a back pressure for a needle 121 is generated by introducing high pressure fuel from the common rail to a fuel tank in reduced pressure control, a piezostack 126 adapted to press/drive the valve 123 is charged to a voltage allowing the valve 123 to lift from a seat 1101 on a low pressure port 111 side of a valve chamber 110. When the valve 123 lifts, a controlling discharge is performed for lowering a piezostack voltage to enlarge a voltage range for a half lift to a value lower than a voltage value allowing the valve 123 to lift. Thereby, a common rail pressure can be steadily reduced.

3. 发明专利

JPH11336638A COMMON RAIL TYPE FUEL INJECTION DEVICE 失效
公开(公告)号：JPH11336638A
公开(公告)日：1999-12-07
申请号：JP14755098
申请日：1998-05-28
申请人： NIPPON SOKEN , DENSO CORP
发明人： ENOMOTO SHIGEIKU , MAKINO MASAAKI , MIYAMOTO YUTAKA , ITO TOSHIHIKO
IPC分类号： F02D1/02 , F02M59/36
摘要： PROBLEM TO BE SOLVED: To adjust an amount of fuel with accuracy irrespective of engine operation conditions in a fuel injection device which controls fuel press-feeding amount by the use of linear solenoid. SOLUTION: A variable discharge amount high pressure pump P is driven while being accompanied with the rotation of an engine E. High pressure fuel compressed by a pump p is accumulated in a common rail R. The high pressure fuel inside the common rail R is injected and supplied to each cylinder of the engine E through electromagnetic fuel injection valves I. A discharge controlling device (solenoid valve) P2 composed of a linear solenoid is arranged on a fuel intake portion of the variable discharge amount high pressure pump P. An ECU 40 selectively executes according to the engine speed, a first control where a lift amount of a valve element of the solenoid valve is varied, and a second control where the lift amount of the valve element is varied and an opening time of the solenoid valve is varied. In such a case, the second control is executed unde low speed area of the engine E, and the first control is executed in other areas.

4. 发明专利

JP2002136156A PIEZOELECTRIC ACTUATOR DRIVE CIRCUIT AND FUEL INJECTION EQUIPMENT 失效
公开(公告)号：JP2002136156A
公开(公告)日：2002-05-10
申请号：JP2000319534
申请日：2000-10-19
申请人： NIPPON SOKEN , DENSO CORP
发明人： FUKAGAWA YASUHIRO , MORITSUGU MICHIYASU , SAKAKIBARA YASUYUKI , ITO TOSHIHIKO
IPC分类号： F02M47/00 , F02D41/04 , F02D41/20 , F02D41/38 , F02D45/00 , F02M47/02 , F02M51/00 , H01L41/083 , H01L41/09 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To control energy supplied to a piezoelectric stack with accuracy. SOLUTION: In a circuit, the piezoelectric stack 2A is charged from a direct- current power supply 11 via an inductor 13 during the on-periods of a switching element 14 that repeatedly turns on and off and by passing flywheel current via the inductor 13 by a diode 151 during the off-periods thereof. A control circuit 18 for controlling the switching element 14 is so set that the on-periods are constant and the charging current is reduced as the charging of the piezoelectric stack 2A progresses and the piezoelectric stack voltage is increased. Thus, even if the condition changes due to increase in piezoelectric stacked capacitance or the like in a direction such that the speed of piezoelectric stack voltage rise is suppressed, the speed of charging current increase will not increase and thus significant changes in the speed of piezoelectric stack voltage will not result. As the result, the speed of charging current reduction remains unchanged.

5. 发明专利

JP2001157472A PIEZOELECTRIC ACTUATOR DRIVING CIRCUIT 失效
公开(公告)号：JP2001157472A
公开(公告)日：2001-06-08
申请号：JP33394099
申请日：1999-11-25
申请人： NIPPON SOKEN , DENSO CORP
发明人： MORITSUGU MICHIYASU , FUKAGAWA YASUHIRO , ITO TOSHIHIKO
IPC分类号： H01L41/09 , F02M51/00 , F02M51/06 , F04B9/00 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To conduct switching operation of a switch provided at a line of a circuit for charging or discharging a piezoelectric actuator. SOLUTION: A capacitor interruptible from or connectible to a DC power source 21 by switches 22, 4 is provided and charged by a predetermined amount of charge for charging the piezoelectric actuator 11. When the actuator is charged, charging switches 52c, 531c are turned on, to close a charging circuit 5c of a resonance circuit of a series connection of the capacitor 3, an inductor 51, and the actuator 11. The actuator 11 is charged by a resonance operation. When the actuator is discharged, a discharge switch 4 is closed, a discharge circuit 5d of a resonance circuit of a series connection of the actuator 11, the inductor 51 and the capacitor 3 is closed, and the charge is recovered to the capacitor 3.

6. 发明专利

JP2000283314A FLOW RATE CONTROL VALVE AND ITS MANUFACTURE 失效
公开(公告)号：JP2000283314A
公开(公告)日：2000-10-13
申请号：JP16399899
申请日：1999-06-10
申请人： NIPPON SOKEN , DENSO CORP
发明人： ENOMOTO SHIGEIKU , INOHARA TAKAYUKI , MIYAMOTO YUTAKA , ITO TOSHIHIKO , NISHIMURA HIROYUKI
IPC分类号： F02M51/00 , F02M51/06 , F02M59/46 , F16K31/06
摘要： PROBLEM TO BE SOLVED: To reduce a manufacturing cost, meet strict accuracy need and improve controlling in a flow amount. SOLUTION: A valve body 63 is slidably arranged inside a valve case 9, while an armature 70 is fixed to its one end. A flow amount control valve P2 adjusts a moving rate of the valve body 63 according according to a rate of current carried to a coil 61, and proportionally controls a fluid flow amount according to the moving rate. An insertion member 75 made of non-magnetic material is inserted between first and second stators 73, 74. The members 73 to 75 are integrated with each other. Coaxialness of holes 73a, 74a can be secured by integrating the first and second stators 73, 74 with each other. The first, second stators 73, 74 and the insertion member 75 are united by laser welding, while holes 73a to 75a are formed on the united member.

7. 发明专利

JP2000120905A FLOW CONTROL VALVE 失效
公开(公告)号：JP2000120905A
公开(公告)日：2000-04-28
申请号：JP28940798
申请日：1998-10-12
申请人： NIPPON SOKEN , DENSO CORP
发明人： ENOMOTO SHIGEIKU , INOHARA TAKAYUKI , ITO TOSHIHIKO
IPC分类号： F02M37/00 , F02M59/06 , F16K31/06
摘要： PROBLEM TO BE SOLVED: To control the fluid flow with high accuracy when the fluid flow is proportionally controlled in response to the amount of lift of a valve element. SOLUTION: A flow control valve P2 is provided with a housing 6 incorporating a coil 61, and a valve case 9 fitted and fixed in the left end of the housing. A valve element 63 is slidably held in a cylinder 62 provided in the valve case 9. Channels 64, 65 are formed in the valce case 9. The same flow control valve P2 is formed as a linear solenoid valve, and the amount of lift of the valve element 63 is determined in response to the current quantity energized to the coil 61. Besides, a tapered face 63b is formed at the tip of the valve element 63. Then, when the valve is closed, the channels 64, 65 are closed by the slidiing face 63a of the valve element 63, and when the valve is opened, fuel (fluid) is discharged through the tapered face 63b. Thus, the fuel flow can be controlled with high accuracy in wide opening control area from a very small opening up to a full-open area.

8. 发明专利

JPH10266826A EXHAUST GAS PROCESSING DEVICE FOR DIESEL ENGINE 失效
公开(公告)号：JPH10266826A
公开(公告)日：1998-10-06
申请号：JP8776097
申请日：1997-03-21
申请人： NIPPON SOKEN , DENSO CORP
发明人： SHIBATA HITOSHI , ITO TOSHIHIKO , SEKIGUCHI KIYONORI , TAMAI KATSUYUKI
IPC分类号： F01N3/02 , F01N3/08
摘要： PROBLEM TO BE SOLVED: To provide an exhaust gas processing device which can effectively collect and process a SOOT part delivered at the time of acceleration, and has no possibility that the device is damaged by heat, and is manufactured at a low cost. SOLUTION: A plurality of particulate collecting passages 2, 3 equipped with a main passage 1 and oxidation catalysts 21, 31, are arranged in this device, and formed to be opened and closed by selector valves 11, 22, 32. An ECU 5 judges operational conditions, outputs a signal to a selector valve driving circuit 4, and opens the particulate collecting passages 2, 3 at the time of a low load so as to adsorb an organic solvent soluble part (SOF) to the oxidation catalysts 21, 31, and opens one particulate collecting passage 2 at the time of acceleration so as to adsorb a graphite part (SOOT) on the oxidation catalyst 21 by making the SOF part as a binder. At the time of constant period, exhaust gas is circulated in the main passage 1. When the collecting amount of the SOOT part becomes a set value, the ECU 5 energizes a heater 23 by a heater driving circuit 6 so as to refresh the oxidation catalyst 21.

9. 发明专利

JP2002261339A LAMINATED PIEZOELECTRIC ACTUATOR 审中-公开
公开(公告)号：JP2002261339A
公开(公告)日：2002-09-13
申请号：JP2001340941
申请日：2001-11-06
申请人： DENSO CORP , NIPPON SOKEN
发明人： KIHARA NORIAKI , ITO TOSHIHIKO , ISHIOKA HARUO , MURAI ATSUSHI
IPC分类号： H01L41/047 , H01L41/083
摘要： PROBLEM TO BE SOLVED: To provide a laminated piezoelectric actuator having full flexible laminated piezoelectric body without the risk of breaking an external electrode. SOLUTION: The laminated piezoelectric actuator 1 includes a laminated piezoelectric body 2, in which a piezoelectric plate 21 made of piezoelectric material and an inner electrode 22 made of a conductive material are laminated alternatively, and an external electrode 3 connected electrically to a plurality of inner electrodes 22 provided on a side face 23 of the laminated piezoelectric body 2. The external electrode includes an electrode base 31, in contact with a side face 23 of the laminated piezoelectric body 2, a flat metallic gauze body 32 provided on the electrode base 31, and a plurality of conductive adhesives 33 for partially bonding the electrode base 31 and the flat metallic gauze body 32. The adjoining conductive adhesives 33 have an overlapping part with each other, in a direction parallel to the piezoelectric plate 21.

10. 发明专利

JP2000097124A HIGH PRESSURE FLUID INJECTION DEVICE 失效
公开(公告)号：JP2000097124A
公开(公告)日：2000-04-04
申请号：JP28198098
申请日：1998-09-17
申请人： NIPPON SOKEN , DENSO CORP
发明人： ITO YOSHIMICHI , TSUZUKI SACHIHIRO , ITO TOSHIHIKO , KOJIMA AKIKAZU
IPC分类号： F02M47/00
摘要： PROBLEM TO BE SOLVED: To simplify the structure of a conduit line, and to prevent that the fuel is continued to inject in the disorder condition of a two-way valve for injection control, in a high pressure fluid injection device. SOLUTION: A needle 12 to open and close an injection hole 101 for fuel injection purpose is controlled by increasing and decreasing the pressure of a control hydraulic chamber 106 generating its back pressure. The high pressure fuel leading-in to the control hydraulic chamber 106, and the release of the high pressure, are carried out by a single common use conduit line 21, by switching a two-way valve 42. Inside a tubular body 11 is made into a valve chest 103 and a cylinder 105, and a needle 12 is held slidable in the cylinder 105 to prevent the leakage of the fuel from the sliding part of the needle 12 to the other part, so as to make a drain conduit line unnecessary. The leading-in of the high pressure fuel to the valve chest 103 is carried out through a check valve 14, and the fuel leading-in to the valve chest 103 is prohibited as well as the inside of the valve chest 103 is maintained at a high pressure, so as to prevent the continuous injection of the fuel.

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