Nissan Motor Company Limited

Ricoh Company, Ltd.

Tohoku University

Aida Engineering Co., Ltd.

Itaru Fujimura

Naoto Fukushima

Yohsuke Akatsu

Yukio Fukunaga

Kensuke Fukuyama

Masaharu Sato

Masaharu Satoh

Yoshiyuki Kageyama

Yukio Ide

Yosuke Akatsu

Migaku Takahashi

Shin Saito

Kohichi Ohshima

Shigeyoshi Misawa

Toshiyuki Kawasaki

Masakiyo Tsunoda

Katutoshi Endo

Tomoyuki Ogawa

Masako Kunita

Hitoshi Nakamura

Sunao Hano

Masahiro Tsukamoto

Kenro Takahashi

Toshiyuki Ogawa

Nachio Seko

Hiroshi Hosoya

Shoji Kuroishi

Tatsuji Nakagawa

Seiichi Oseto

Kazuhiko Fujimoto

Junkichi Comikawa

Yukio Fukanaga

An information recording apparatus has a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles. Summary information may be recorded for plural information recording parts.

Information recording apparatus and method, information reproducing method and fade-in memory, with summary information corresponding to plurality of information recording elements

An information recording apparatus comprises a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles.

Information recording method and apparatus using plasmonic transmission along line of ferromagnetic nano-particles with reproducing method using fade-in memory

A hydraulic press has closed loop feedback control on a slide, a slide pad and bolster cylinders. Hydraulic cylinders actuating various components of the press are controlled according to ideal position estimates to produce consistent and precise pressing action. A closed loop control consists of an ideal position/pressure value generator, a position/pressure detector and an arithmetic unit comparing the ideal and actual position/pressure values. Using the ideal and actual comparison result, the arithmetic unit produces a control signal to drive a cylinder to a desired position/pressure. The hydraulic press is capable of performing several operations on a workpiece in one press cycle, an improvement over presses requiring several operation steps or die changes. The bolster cylinders augment clamping force, reduce shock, and improve die alignment to produce better results with less wear on press components.

Hydraulic press for forming metal plates

An active suspension system is provided which includes hydraulic cylinders for suppressing rolling motion of a vehicle body. The system is responsive to lateral acceleration acting on the vehicle body to provide a control signal for supplying hydraulic pressure to the cylinders for anti-rolling control. The control signal includes first and second pressure control signals. The first pressure control signal commands supply of hydraulic pressure for providing an anti-rolling moment, while the second pressure control signal commands supply of hydraulic pressure for supporting a portion of the static load of the vehicle body to maintain the vehicle body at a target height level. The system is further responsive to increase in lateral acceleration to modify the second pressure control signal to reduce the hydraulic pressure for supporting the portion of static load, thereby compensating for forces acting to raise the vehicle body caused by the anti-rolling control for establishing a constant vehicular height level irrespective of variation in the lateral acceleration acting on the vehicle body.

Automotive active suspension system for regulating vehicular height

An actively controlled suspension system for automotive vehicles includes a lateral acceleration sensor and a controller for suppressing rolling of the vehicle. The controller controls a distribution ratio of anti-roll moment or lateral load shift between a driven wheel and a non-driven wheel so as to enhance steering characteristics of the vehicle. The controller changes the distribution ratio depending on both the lateral acceleration and the wheel speed difference between the driven wheel speed and the non-driven wheel speed such that the distribution ratio at a non-driven wheel side of suspension system is increased from a designated reference value according to the increase in the wheel speed difference and a rate of change in the distribution ratio is attenuated towards the designated reference value according to the increase in the lateral acceleration.

Actively controlled suspension system for automotive vehicles

An automotive suspension control system for anti-rolling motion control is provided. This system serves to adjust wheel loads acting on driven wheels when a wheel speed difference between the driven wheels is greater than a preselected value, concluding that slippage occurs at one of the driven wheels, the adjustment is carried out for securing traction of a slipping driven wheel. The system is responsive to lateral acceleration acting on a vehicle body to decrease a degree of adjustment of the wheel loads according to increase in the lateral acceleration for enhancing cornering stability on road surfaces having different friction coefficients.

Automotive active suspension system for anti-rolling control

An active suspension system for an automotive vehicle is arranged to regulate the attitude of a vehicle body in a flat or balanced state by controlling hydraulic cylinders respectively disposed between a vehicle body and a road wheel, in response to an attitude change of the vehicle body. The active suspension system comprises electromagnetically operated variable vibration attenuation valves, each of which is fluidly connected with each hydraulic cylinder and is followed by an accumulator. Each variable vibration attenuation valve is adapted to be variable in its attenuation constant in response to a vertical acceleration experienced by the road wheel. The variable vibration attenuation valve takes on a low attenuation constant to maintain a high riding quality of the vehicle under a normal cruising condition, and a high attenuation constant to suppress the response of the road wheel under a rough road cruising condition.

Active suspension system

An anti-rolling suspension control system generally derives anti-rolling control signals for controlling suspension characteristics of respective suspension systems in order to suppress vehicular rolling motion. The system is further provided means for monitoring road friction condition. The system derives distribution of rolling moment distribution ratio between front suspension systems and rear suspension systems based on the monitored road friction condition so that the derived distribution may be adapted to the road surface frictional condition.

Anti-rolling controlling system for automotive active suspension system

A suspension control system employs a first lateral acceleration sensor for monitoring a lateral acceleration at a first point on a vehicular body and a second lateral acceleration sensor for monitoring lateral acceleration at a second point on the vehicular body, which second point is provided at a longitudinally offset position from the first point. A controller derives a lateral shifting of vehicular load at the front suspension systems on the basis of a first lateral acceleration monitored by the first lateral acceleration sensor, and a lateral shifting of the vehicular load at a rear suspension system on the basis of a second lateral acceleration monitored by the second lateral acceleration sensor. Control for front and rear suspension systems is performed independently on the basis of the lateral load shifting at the front and rear suspension systems.

Suspension control system with variable steering characteristics

An active suspension system for an automotive vehicle is provided which regulates relative displacement between a vehicle body and wheels. This suspension system includes first and second gain controllers associated with hydraulic cylinders for supressing vehicular rolling based on lateral acceleration acting on the vehicle body. The first and second gain controllers amplify the level of the lateral acceleration, monitored by a sensor, by first and second gains respectively to vary pressure of the hydraulic cylinders. The suspension system further includes a low-pass filter which restricts a frequency of a signal output from the acceleration sensor high than a preselected cutoff frequency to decrease the second gain relative to the first gain to reduce the degree of load shift for the rear wheels relative to that of the front wheels.

Control system for active suspension which distributes load according to

An actively controlled suspension system employs a lateral acceleration sensor for monitoring lateral acceleration exerted on the vehicular body. The lateral acceleration is shifted frontwardly from a gravity center of the vehicle body at the neutral position or non-rolling condition. The magnitude of frontward offset of the lateral acceleration sensor is so selected as to cancel influence of phase delay when the lateral acceleration sensor is oriented at the position of the neutral gravity sensor.

Anti-rolling control for actively controlled automobile suspension

A pressure supply network for an active suspension system employs a strategy for predicting consumed fluid flow rate on the basis of bounding and rebounding stroke between a vehicular body and a suspension member rotatably supporting a vehicular wheel. A discharge rate of a fluid pump disposed in the pressure supply network is controlled on the basis of the predicted fluid flow rate.

Pressure supply network for active suspension system and control therefor

A fluid supply system is provided for an active vehicle suspension system, for supplying fluid pressure for a hollow working cylinder via a pressure control valve for adjusting suspension characteristics of the vehicle in order to suppress vehicular attitude changes and to absorb road shock vibration, the system having a pressurized fluid source unit for circulating a pressurized fluid through a fluid circuit extending via the pressure control valve and the working cylinder. A first sensor is provided for monitoring a relative displacement between the body of the vehicle and a suspension member rotatably supporting a road wheel thereof, for producing a relative displacement magnitude indicative signal. A second sensor is provided for monitoring a lateral acceleration exerted on the vehicle body. A predicted fluid flow amount through said fluid circuit is derived on the basis of the relative displacement indicative signal to produce a predicted fluid flow amount indicative signal. A magnitude of lateral acceleration greater than or equal to a predetermined acceleration criterion is detected to produce an acceleration detection signal. The fluid supply amount from the pressurized fluid source unit is derived of the basis of the predicted fluid flow amount for controlling the pressurized fluid source unit in order to adjust the supply amount of fluid toward the derived fluid supply amount in response to the acceleration detection signal for increasing the supply amount.

Fluid supply circuit for active suspension system with variable fluid

An active suspension system utilizes an acceleration exerted on a vehicle body and a stroke magnitude in relative displacement between the vehicle body and a suspension member as parameters for controlling discharge rate of pressure medium fluid from a pressure source unit. The pressure source unit is normally driven at limited discharge rate for minimizing driving power consumption. The pressure source unit is responsive to the vertical acceleration greater than a predetermined acceleration criterion and to vertical stroke magnitude greater than a predetermined stroke criterion to increase discharge rate for compensating pressure medium fluid amount to be consumed for suspension control.

Pressure medium fluid circuit for active suspension system with variable

A vehicular height regulation system performs attitude change suppressive suspension control for equalized magnitude at respective of front and rear wheels. For performing equalized magnitude not only for the front suspension systems, the vehicular height control system includes a pair of actuator means associated with respective of rear-left and rear-right wheels, which actuator means are operable independently of each of other.

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Kanagawa, Japan

Itaru Fujimura