Nissan Motor Company Limited

Yuji Okuyama

Katsuya Kii

Kazuo Mori

Kunio Katada

Takashi Yonezawa

Yukio Fukunaga

Yasuji Shibahata

Takaaki Uno

Yasumasa Tsubota

A suspension control system performs vehicular attitude regulating operation by adjusting damping characteristics at respective of suspension systems. For controlling damping characteristics, a suspension control command value is derived on the basis of an acceleration exerted on the vehicular body, which acceleration influences vehicular attitude. The suspension control command value is variable depending upon the magnitude of the vehicular attitude influencing acceleration. Variation rate of the suspension control command value versus variation of the vehicular attitude influencing acceleration is variable in such a manner that increasing rate of the suspension control command value decreases according to increasing of the acceleration.

Automotive suspension system with feature of prevention of sudden change

A suspension control system employs an acceleration sensor for monitoring an inertial force affecting for vehicular attitude. A control system coacting therewith includes a mechanism for lowering the level of an output signal of the acceleration sensor to eliminate therefrom any error corresponding a resonance frequency of the acceleration sensor for obtaining higher accuracy inertially indicative data.

Suspension control system with monitoring of inertia force with high

A suspension control system includes a plurality of suspension systems respectively disposed between a vehicular body and each road wheel thereof, the suspension systems having variable damping characteristics. Each suspension system is associated with means for adjusting damping characteristics according to a suspension control command. Each suspension control system also includes a sensor means for monitoring an inertia force exerted on the vehicular body, which inertia force affects for vehicular attitude to cause a vehicular attitude change. A control unit receives the output of the sensor means and derives a suspension control command for regulating vehicular height and vehicular attitude. The control unit is designed to detect a predetermined particular vehicle driving condition on the basis of the sensor output for deriving the suspension control command for adjusting vehicular height to a lower level than a normal height level.

Suspension control system with vehicular driving condition dependent

An active suspension system includes vertical acceleration sensors provided at positions where suspension systems associated with respective vehicular wheels are provided. A control unit receives vertical acceleration data of the respective suspension systems for processing the received data for deriving control command values representative of required damping magnitudes at the respective suspension systems. For this, the control unit derives angular velocity of vehicular attitude change. The control command value is thus derived on the basis of the vehicular attitude change and angular velocity.

Attitude change suppression control system for active suspension system

An active suspension system employs a vertical acceleration sensor for monitoring vertical acceleration exerted on the vehicular body at an orientation where a suspension system is provided, to produce a vertical acceleration indicative signal. The system derives a vertical displacement speed on the basis of the vertical acceleration indicative signal. A suspension control command for stabilizing vertical vibration is thus derived on the basis of the vertical motion speed and a given gain. In order to facilitate satisfactorily high cornering stability, the system varies the gain for deriving the suspension control command depending upon a lateral acceleration exerted on the vehicular body.

Active suspension system with enhanced stability

In addition to a conventional steering system for steering a vehicle through the front wheels in accordance with an angular displacement of the steering wheel, the vehicle is equipped with a negative feedback steering control system which steers the vehicle through the front or rear wheels in accordance with an instantaneous yaw rate of the vehicle. The feedback system has a vehicle behavior sensor for sensing the yaw rate, and an control circuit which determines an actual quantity which is equal to the yaw rate or a linear combination of the yaw rate and the time derivative of the yaw rate and a reference quantity which is a function of the angular displacement and the vehicle speed, so designed as to be approximately equal to the yaw rate if there is no disturbance. The control circuit produces a feedback signal proportional to a difference between the actual quantity multiplied by a first coefficient and the reference quantity multipled by a second coefficient. In response to the feedback signal, an actuator corrects the direction of the front or rear wheels in such a direction as to reduce the yaw rate. A lateral acceleration of the vehicle may be used in place of the yaw rate.

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Tochigi, Japan

Yuji Okuyama