Land vehicles – Wheeled – Running gear
Patent
1992-10-23
1994-06-21
Tyson, Karin L.
Land vehicles
Wheeled
Running gear
36442405, B60G 1706
Patent
active
053223195
ABSTRACT:
An active suspension apparatus is provided for a vehicle which includes an actuator being extensible and retractable and provided between a vehicle body and a wheel so that the force of the vehicle body to support the wheel is adjustable, a sprung G sensor or a vehicle height sensor for detecting a vibration input to the vehicle body, and a control valve and a controller for controlling the supporting force of the actuator in accordance with the vibration input detected by the sprung G sensor or the vehicle height sensor, and thereby restraining the stroke of the actuator. The suspension apparatus further comprises a forward road surface sensor for detecting the size of irregularities of a road surface in front of the vehicle, and the control valve and the controller are adapted to execute normal control such that the equivalent spring constant of the actuator is adjusted to a first spring constant when a surface irregularity of a size larger than a predetermined size is detected by the forward road surface sensor, and to execute inverse spring control such that the equivalent spring constant of the actuator is adjusted to a second spring constant lower than the first spring constant, and thereby lengthening the stroke of the wheel, when no surface irregularity of a size larger than the predetermined size is detected by the forward road surface sensor. As a result, the ride is greatly improved when the vehicle runs on a smooth road.
REFERENCES:
patent: 3003783 (1961-10-01), Brueder
patent: 4513833 (1985-04-01), Sheldon
patent: 4595072 (1986-06-01), Barnea
patent: 4770438 (1988-09-01), Sugasawa
patent: 4825370 (1989-04-01), Kurosawa
Kishimoto Naohiro
Morita Takao
Tanaka Tadao
Togashi Akihiko
Yoshida Hiroaki
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Tyson Karin L.
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