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1. 发明专利

JPH03258609A CONTROL DEVICE FOR DAMPING FORCE VARIABLE SHOCK ABSORBER 失效
公开(公告)号：JPH03258609A
公开(公告)日：1991-11-18
申请号：JP9427890
申请日：1990-04-10
申请人： NIPPON DENSO CO
发明人： SUZUKI YUTAKA , SHIOZAKI MAKOTO , ONOKI NOBUYOSHI , TAKAAI KAZUO , TAKEDA KEIZO
IPC分类号： B60G17/015 , F16F9/50
摘要： PURPOSE:To always ensure satisfactory riding performance and riding comfortableness by judging the condition of a road surface according to the integrating value of physical quantity, the variation of which is enlarged according to the projection and recess of a road surface, whereby the generated damping force of a shock absorber is changed. CONSTITUTION:The generated damping force of a shock absorber F is changed according to a signal level of a control signal. In this case, the physical quantity which changes depending on the projection and recess of a road surface is detected by a means A. The absolute value of the detected physical quantity is integrated by a means B. Further, according to an integration signal, the signal level of the above control signal is changed by a means C. On the other hand, the rate of change of physical quantity and a designated threshold value are compared with each other by a means D. When the rate of change of physical quantity is less than the threshold value, a control signal, the signal lever of which has been changed is output during designated time, and when the rate of change is more than the threshold value, a control signal of the signal level for decreasing the generated damping force is output during designated time respectively by a means E.

2. 发明专利

JPH0378474A CONTROL CIRCUIT FOR ULTRASONIC MOTOR 失效
公开(公告)号：JPH0378474A
公开(公告)日：1991-04-03
申请号：JP21374589
申请日：1989-08-19
申请人： NIPPON DENSO CO
发明人： TAKEDA KEIZO , AKAHORI ICHIRO , NAKANO YOSHIHISA
IPC分类号： H02N2/00
摘要： PURPOSE:To drive a motor efficiently by providing a displacement sensor and a sweep means and making the reference frequency follow the resonance frequency. CONSTITUTION:A ultrasonic motor comprises a stator where a piezoelectric element is adhered to an elastic body, and a control circuit 1. The control circuit 1 applies AC voltage onto the piezoelectric element 2 and comprises a determining means 3, a sweep means 4, a drive means 5, and a comparing means 6. The section at the segment electrode 2d of the piezoelectric body 2 is employed as the displacement sensor for the elastic body. Reference frequency determined through the determining means 3 is modified, within a predetermined range, through the sweep means 4 and applied onto the piezoelectric body 2. Further, the sensor output at this time is fed to the comparing means 6 and the reference frequency is increased or decreased to match with the resonance frequency through the determining means 3.

3. 发明专利

JPH05116519A DAMPING FORCE CHANGEABLE SHOCK ABSORBER CONTROL DEVICE 失效
公开(公告)号：JPH05116519A
公开(公告)日：1993-05-14
申请号：JP28142891
申请日：1991-10-28
申请人： NIPPON DENSO CO
发明人： TAKEDA KEIZO , SHIOZAKI MAKOTO , MORI HOMARE , TAKAAI KAZUO
IPC分类号： B60G17/015 , F16F9/46
摘要： PURPOSE:To provide a shock absorber control device which can properly set a dynamic range by learning and which can effectively restrain the vibration of a vehicle body with no delay. CONSTITUTION:At step 511, if the difference between an instruction voltage value calculated at the previous step 505 and an instruction voltage value calculated at the present step 505 exceeds a predetermined value, and if a difference FAB in damping force calculated at step 510 exceeds a predetermined value, it is determined that the instruction voltage value Vs calculated at the present step 505 is in a dynamic range 1. Thereafter, at step 512, the instruction voltage value Vs and the result of determination at step 511 are stored in a memory within an electronic control device.

4. 发明专利

JPH05104924A VARIABLE DAMPING FORCE TYPE SHOCK ABSORBER CONTROL DEVICE 失效
公开(公告)号：JPH05104924A
公开(公告)日：1993-04-27
申请号：JP26792091
申请日：1991-10-16
申请人： NIPPON DENSO CO
发明人： TAKEDA KEIZO , SHIOZAKI MAKOTO , MORI HOMARE , TAKAAI KAZUO
IPC分类号： B60G17/015
摘要： PURPOSE:To prevent the generation of noise caused by the vibration of a support part by providing a limiting means for limiting a command signal outputted from a command signal output means, to the value at the noise genera tion start time or less. CONSTITUTION:In a step 508, the vibration of a support part 1 is estimated from the damping force detected in a step 502. In a step 509, the upper limit value of the damping force is computed from the allowed level of vibration in steps 506, 507 and the vibration of the support part 1 estimated in the step 508. The upper limit value VSB of command value (damping coefficient) that can be set in the following control cycle up to the time of the estimated vibration of the support part 1 reaching the allowed level is computed from the computed upper limit value of the damping force and the expansion speed of a shock absorber 6 detected in a step 503. In a step 510, the command value VSA computed in a step 505 is compared with the upper limit value VSB computed in the step 509, and the smaller value is outputted as command signal voltage VS to an actuator drive unit.

5. 发明专利

JPH04342608A SUSPENSION CONTROLLER 失效
公开(公告)号：JPH04342608A
公开(公告)日：1992-11-30
申请号：JP11463391
申请日：1991-05-20
申请人： NIPPON DENSO CO
发明人： TAKAAI KAZUO , SHIOZAKI MAKOTO , MORI HOMARE , TAKEDA KEIZO
IPC分类号： B60G17/015 , B60G17/08 , F16F9/50
摘要： PURPOSE:To carry out the sky hook damper control by varying the damping coefficient of a shock absorber by the actuator driving instruction signal voltage, even in the case where uncertain elements exist in an actuator. CONSTITUTION:A suspension controller is equipped with a load sensor 13 for detecting the damping force Fc of a shock absorber and an accelerating speed sensor 11 for detecting the accelerating speed (a) in the suspension operation direction, and the aimed sky hook damper force Fs is calculated by taking the damping force Fc and accelerating speed (a) which are detected by the above-described sensors, into a shock absorber controller 2, and the instruction signal voltage is outputted to an actuator controller 3 in order to make the damping force Fc close to the sky hook damper force Fs.

6. 发明专利

JPH04185518A CONTROLLER OF DAMPING FORCE VARIABLE SHOCK ABSORBER 失效
公开(公告)号：JPH04185518A
公开(公告)日：1992-07-02
申请号：JP31633090
申请日：1990-11-20
申请人： NIPPON DENSO CO
发明人： TAKEDA KEIZO , SHIOZAKI MAKOTO , SUZUKI YUTAKA
IPC分类号： B60G17/08 , B60G17/015 , H02N2/00
摘要： PURPOSE:To adjust generated damping force exactly at all time regardless of the change in the capacitance of a charge detecting capacitor by detecting the change in the capacitance of the charge detecting capacitor, and compensating a target charge amount for a piezoactuator based on the detected amount. CONSTITUTION:A damping force variable shock absorber is provided with a piezoactuator A which elongates based on the amount of an electric charge to be fed, and a valve member B which is operated by the piezoactuator A and adjusts generated damping force. With this constitution, a charge detecting capacitor C which issues voltage proportional to the amount of the electric charge to be fed is connected to the piezoactuator A in series. The output voltage of the charge detecting capacitor C is detected, and charging or discharging is carried out by a means D so as to make the amount of an electric charge to be fed for the piezoactuator A coincide with a target charge amount. Moreover, from the voltage across the charge detecting capacitor C after a certain time has passed, its capacitance is detected by a means E. Based on the detected capacitance, the target charge amount of the piezoactuator A is compensated by a means F.

7. 发明专利

JPH042516A DAMPING FORCE VARIABLE SHOCK ABSORBER CONTROL DEVICE 失效
公开(公告)号：JPH042516A
公开(公告)日：1992-01-07
申请号：JP10100390
申请日：1990-04-17
申请人： NIPPON DENSO CO
发明人： ISHIKAWA HIROSHI , TAKEDA KEIZO , WATANABE KOJI
IPC分类号： B60G17/015 , F16F9/50
摘要： PURPOSE:To reduce gate vibration, sensible vibration and fluttering vibration by detecting plural frequency signals from the components of damping force detecting signals to integrate each of frequency signals so that the components of gate vibration, sensible vibration and fluttering vibration can be detected and setting base damping force in accordance with each of components. CONSTITUTION:A damping force detecting means A which detects damping force generated in a shock absorber is provided so that signals with plural frequency components may be detected by a frequency signal detecting means B from the components of damping force detecting signals detected by the damping force detecting means A. An integrating means C integrates each of signals with abovementioned plural frequency components detected by the frequency signal detecting means B to detect respective components of gate vibration, fluttering vibration and sensible vibration, and so a base damping force setting means D sets the base damping force of the shock absorber in accordance with these components.

8. 发明专利

JPH0373201A VIBRATIONAL WORKING DEVICE 失效
公开(公告)号：JPH0373201A
公开(公告)日：1991-03-28
申请号：JP20913989
申请日：1989-08-10
申请人： NIPPON DENSO CO
发明人： TAKEDA KEIZO , NAKANO YOSHIHISA , TOMITA MASAHIRO , MORIWAKI JUNJI
IPC分类号： B23B1/00 , B03B1/02
摘要： PURPOSE:To always a drive an oscillator in its resonance frequency with a simple structure by detecting the phase difference between the signal applied to a laminated- type piezoelectric actuator and the detected signal from a laminated piezoelectric element for changing the frequency of the applied signal. CONSTITUTION:A piezoelectric element 7 is laminated together with a laminated-type piezoelectric actuator 2 in the inside of a housing 1, and the frequency of the signal to be applied to the actuator 2 is regulated by a voltage/frequency conversion circuit. And the phase difference between the signal applied to the actuator 2 through the voltage/frequency conversion circuit and the detected signal of the piezoelectric element 7 is detected by a phase difference detecting means for converting the voltage to that corresponding to the phase difference, and the voltage/frequency conversion circuit is controlled by a control circuit for changing the frequency of the signal to be applied to the actuator 2 so that the voltage corresponding to the phase difference is equalized to the voltage corresponding to the phase difference at the resonance point of an oscillator which has been previously obtained. As a result, the oscillator can be driven in its resonance frequency, and since the respective piezoelectric element are connected in parallel by using the laminated-type piezoelectric actuator 2, a lager displacement can be obtained in a lower voltage.

9. 发明专利

JPH0192552A FUEL INJECTION RATE CONTROL DEVICE 失效
公开(公告)号：JPH0192552A
公开(公告)日：1989-04-11
申请号：JP25049487
申请日：1987-10-02
申请人： NIPPON DENSO CO
发明人： SUZUKI YUTAKA , TAKEDA KEIZO , NAKAJIMA TATSUSHI
IPC分类号： F02D41/38 , F02B3/06 , F02D41/00
摘要： PURPOSE:To enable more precise pilot injection control by setting the time of transferring an electric charge to a piezo actuator for determining the initiation and completion of pilot fuel injection, the time of discharging thus transferred electric charge and a charged electric charge amount in accordance with the operating condition. CONSTITUTION:During operation of a diesel-engine, a calculating means M3 calculates and electric charge charged to a piezo actuator M1 in accordance with an output from an operating condition detecting means M2, and a charging means M5 charges a capacitor M4 in accordance with the result of the calculation. Further, the charged electric charge is transferred to the piezo actuator M1 by a transfer means 6 so that the actuator M1 is extended to pressurize fuel in a high pressure chamber in an injection pump for initiating fuel injection. Further, when the electric charge transferred to the piezo actuator M1 is discharged through a discharge means 7, the fuel injection is terminated. These transfer time and discharge time are controlled by a control means M8 at predetermined times during fuel pressurization stroke of the fuel injection pump.

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