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1. 发明专利

JP2005016431A Piezo actuator driving circuit 有权
标题翻译： PIEZO执行器驱动电路
公开(公告)号：JP2005016431A
公开(公告)日：2005-01-20
申请号：JP2003182997
申请日：2003-06-26
申请人： Denso Corp , Nippon Soken Inc , 株式会社デンソー , 株式会社日本自動車部品総合研究所
发明人： FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI , MORITSUGU MICHIYASU , TAKEMOTO HIDETSUGU
IPC分类号： F02M51/00 , F02D41/20 , F02D41/38 , H01L41/04 , H01L41/09 , H02N2/06
CPC分类号： H02N2/067 , F02D41/2096
摘要： PROBLEM TO BE SOLVED: To provide a piezo actuator driving circuit excellent in controllability on charge energy.
SOLUTION: The piezo actuator driving circuit comprises a power carrying path 31 for charging a piezo actuator 2 via an inductor 301 and a switch 4a from a capacitor 12 during the time when the switch 4a is turned on, a second power carrying path 32 for charging the piezo actuator 2 via the inductor 301 by bypassing the switch 4a and the capacitor 12 during the time when the switch 4a is turned off, a current detecting means 51 for detecting a current flowing from the capacitor 12 through part of the power carrying path 31 not shared with the power carrying path 32, and a switch control means 7 for controlling the switch 4a to regulate a detected current value to a target value during a specified charging period so that a sufficient current is supplied during an ON time even if the increasing speed of the current becomes low due to a deterioration in the capacity of the piezo actuator. Energy can be easily and accurately regulated by detecting the amount of discharge on a capacitor 12 side having a small voltage fluctuation.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在电荷能量方面具有优异的控制性的压电致动器驱动电路。解决方案：压电致动器驱动电路包括用于在开关4a导通的时间期间经由电感器301和来自电容器12的开关4a对压电致动器2充电的供电路径31，第二供电路径 32，用于在开关4a断开时通过旁路开关4a和电容器12经由电感器301对压电致动器2充电;电流检测装置51，用于检测从电容器12流过电力部分的电流承载路径31不与供电路径32共用的开关控制装置7，以及用于控制开关4a在指定的充电周期内将检测到的电流值调节到目标值的开关控制装置7，使得在接通时间期间甚至提供足够的电流如果由于压电致动器的容量的劣化，电流的增加速度变低。通过检测具有小电压波动的电容器12侧的放电量，能够容易且准确地调节能量。版权所有（C）2005，JPO＆NCIPI

2. 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.

3. 发明专利

JP2002134804A MALFUNCTION DETECTOR OF PIEZOELECTRIC ACTUATOR 失效
公开(公告)号：JP2002134804A
公开(公告)日：2002-05-10
申请号：JP2000327056
申请日：2000-10-26
申请人： NIPPON SOKEN , DENSO CORP
发明人： FUKAGAWA YASUHIRO , MORITSUGU MICHIYASU , SAKAKIBARA YASUYUKI , KUMANO MIKIO
IPC分类号： H01L41/083 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To provide a malfunction detector of a piezoelectric actuator which enables detecting more precisely malfunctions as a partial break or short- circuiting of the piezoelectric actuator. SOLUTION: This malfunction detector of a piezoelectric actuator is provided with a high voltage generating circuit 2 for generating high voltage to apply to a piezoelectric actuator 1 which comprises layered elastic piezoelectric materials 11 according to applying voltage, and a switching circuit 3 for applying to piezoelectric actuator 1 a high voltage which is generated in a high voltage generating circuit 2 during turning on of a switching element to charge and for discharging stored charge to piezoelectric actuator 1 during turning on of the switching element to discharge. Abnormality status is detected in detail by detecting with an malfunction detecting circuit 5 piezoelectric actuator voltage at a definite period of time after a control circuit 4 outputs a charging/ discharging voltage into switching circuit 3 and comparing the voltage with the normal value of the piezoelectric actuator voltage at the moment.

4. 发明专利

JP2003227392A PIEZO-ACTUATOR CONTROL DEVICE, PIEZO-ACTUATOR CONTROL METHOD AND FUEL INJECTION CONTROL SYSTEM 审中-公开
公开(公告)号：JP2003227392A
公开(公告)日：2003-08-15
申请号：JP2002025666
申请日：2002-02-01
申请人： NIPPON SOKEN , DENSO CORP
发明人： FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI , TAKEMOTO HIDETSUGU
IPC分类号： F02M45/02 , F02D41/20 , F02D41/38 , F02D41/40 , F02M47/00 , F02M51/00 , F02M51/06 , H01L41/04 , H01L41/083 , H01L41/09
摘要： PROBLEM TO BE SOLVED: To provide a piezo-actuator control device and a piezo-actuator control method in which an energy of piezo-stack is retained at constant even in the case where the piezo-stack is switched to charging during discharging. SOLUTION: A voltage of the piezo-stack 51 is compared with a voltage memorized in a sample hold circuit 75 by a comparison circuit and when the voltage of the piezo-stack 51 arrives at the voltage memorized in the sample hold circuit 75, a control circuit 70 finishes a charge stage of the piezo-stack 51. Thereby, an energy charged in the piezo-stack 51 can be equalized to the energy charged before discharging. When the charge stage of the piezo-stack 51 is finished by the control circuit 70, the voltage of the piezo-stack 51 is controlled to approximately the same as that at the time of former injection. If an electrostatic capacity of the piezo-stack 51 is equal, an electric energy charged in the piezo-stack 51 can be also equalized. COPYRIGHT: (C)2003,JPO

5. 发明专利

JP2003134851A PIEZO-ACTUATOR DRIVE CIRCUIT 审中-公开
公开(公告)号：JP2003134851A
公开(公告)日：2003-05-09
申请号：JP2001323407
申请日：2001-10-22
申请人： NIPPON SOKEN , DENSO CORP
发明人： FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI , NARUSE HIDEO
IPC分类号： F02M51/00 , F02M51/06 , H01L41/083 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To simplify configuration of a piezo-actuator drive circuit, and to separately set the charging speed and the discharging speed of piezo-actuators. SOLUTION: The piezo-actuator drive circuit is provided with a capacitor 23 for storing the electrical energy for driving the piezo-actuators, and a coil 30 for charging/discharging connected in series with the capacitor 23. When charged or discharged, the piezo-actuators 11 to 14 are charged from or discharged to the capacitor 23 through the coil 30 for charging/discharging, coil 30 for charging/discharging is constituted of coils in two different systems having different inductances, and the inductance is changed in charging and in discharging.

6. 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.

7. 发明专利

JP2002159190A PIEZOACTUATOR DRIVE CIRCUIT 失效
公开(公告)号：JP2002159190A
公开(公告)日：2002-05-31
申请号：JP2000352183
申请日：2000-11-20
申请人： NIPPON SOKEN , DENSO CORP
发明人： FUKAGAWA YASUHIRO , MORITSUGU MICHIYASU , SAKAKIBARA YASUYUKI , NARUSE HIDEO
IPC分类号： H01L41/083 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To control energy supply to a piezostack with high accuracy. SOLUTION: In a multi-switching system circuit provided, in the charging path from a buffer capacitor 113 to a piezostack 2A, with a switching element 14 turning on/off repeatedly, a diode 17 connecting the output end of an inductor 13 with the positive pole of the buffer capacitor 113 is provided to bias the voltage across the buffer capacitor 113 reversely. When the piezostack voltage reaches a target level, the switching element 14 is locked in off state and a switching element 16A is turned off so that a flywheel current generated by energy stored in the inductor 13 is collected to the buffer capacitor 113 not through the piezostack 2A but through the diode 17 thus preventing the piezostack voltage from increasing after the switching element 14 is locked in off state.

8. 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.

9. 发明专利

JP2004282988A Piezoelectric-actuator drive circuit 有权
公开(公告)号：JP2004282988A
公开(公告)日：2004-10-07
申请号：JP2003410907
申请日：2003-12-09
申请人： Denso Corp , Nippon Soken Inc , 株式会社デンソー , 株式会社日本自動車部品総合研究所
发明人： FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI , TAKEMOTO HIDETSUGU
IPC分类号： F02M51/00 , F02D41/20 , F02M51/06 , H01L41/04 , H01L41/083 , H02N2/00 , H02N2/06
CPC分类号： H01L41/042 , F02D41/2096
摘要： PROBLEM TO BE SOLVED: To provide a piezoelectric-actuator drive circuit capable of controlling a piezoelectric-stack with high precision irrespective of fluctuation in quality between individual elements or the like. SOLUTION: This drive circuit is provided with charging means 12a, 12b that charge a piezoelectric-stack that is driven by charging and discharging within a prescribed charging period Tt, an operation means 19a that calculates volume of charge that is charged by the charging means 12a, 12b during a prescribed charging period Tt, and a drive controlling means 19 that compares the volume of charge calculated by the operation means 19a with the target volume of charge and corrects the volume of charge in the next charging process according to the difference. The volume of charge calculated by the operation means 19a is preferred to be charge energy that is obtained by measuring a charging current and a charging voltage that flow into the piezoelectric-stack 7 during the charging process, and by integrating the product of the measured charging current and charging voltage over time. COPYRIGHT: (C)2005,JPO&NCIPI

10. 发明专利

JP2003333832A Equivalent series resistance correcting circuit and piezoelectric actuator driving circuit 审中-公开
标题翻译：等效电阻校正电路和压电致动器驱动电路
公开(公告)号：JP2003333832A
公开(公告)日：2003-11-21
申请号：JP2002136891
申请日：2002-05-13
申请人： Denso Corp , Nippon Soken Inc , 株式会社デンソー , 株式会社日本自動車部品総合研究所
发明人： FUKAGAWA YASUHIRO , SAKAKIBARA YASUYUKI , NARUSE HIDEO
IPC分类号： F02D41/20 , H02M3/135 , H02N2/00
摘要： PROBLEM TO BE SOLVED: To prevent an output voltage from decreasing due to a voltage drop caused by the equivalent series resistance component of a buffer capacitor in a circuit for supplying a current intermittently from the buffer capacitor. SOLUTION: A high capacity buffer capacitor 13 is connected in parallel with a correction capacitor 14 having resistance lower than the equivalent series resistance component thereof thus suppressing the voltage drop. An output voltage drop during power supply resulting from the fact that the capacity of the buffer capacitor 13 is lower than that of the correction capacitor 14 is supplemented by moving charges from the buffer capacitor 13 to the correction capacitor 14 when power is not supplied to a load 6. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了防止由于缓冲电容器中的缓冲电容器的等效串联电阻分量引起的电压降低而导致的电压下降，所述缓冲电容器用于从缓冲电容器间歇地提供电流。解决方案：高容量缓冲电容器13与具有低于其等效串联电阻分量的电阻的校正电容器14并联连接，从而抑制电压降。由于缓冲电容器13的容量比校正电容器14的容量低的事实，在电力供给期间的输出电压降被补充，当电力没有被供给到补偿电容器14时，从缓冲电容器13移动到校正电容器14 负责6.版权所有（C）2004，JPO

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