Land vehicles – Wheeled – Running gear
Patent
1990-05-29
1991-05-21
Bertsch, Richard A.
Land vehicles
Wheeled
Running gear
280689, B60G 17015
Patent
active
050169106
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a suspension system for motor vehicles and, more particularly, to a damping force control system of a suspension system mounted between a vehicle body and front and rear right and left wheels of a motor vehicle.
BACKGROUND OF THE INVENTION
There has been known in the prior art such a suspension system that front and rear wheels are mounted on a vehicle body through suspension cylinders in order to prevent the passage, up to the vehicle body, of the bouncing of the front and rear wheels during a drive along a rough road.
The vehicle body provided with this type of suspension system undesirably tends to make an outward tilt, or a body roll, on cornering, with a centrifugal force acting to contract the outer suspension cylinders of the motor vehicle.
In order to prevent the body roll, therefore, there has been adopted a means to detect a steering angle or a steering angular velocity when the steering wheel is manipulated, for the purpose of increasing a damping force of the outer suspension cylinders of the vehicle when the vehicle is rounding a curve, thereby restraining suspensions' contraction caused by the centrifugal force.
However, in the detection of the steering angle alone, the steering wheel must be turned to a set steering angle to obtain a desired damping force of the suspension cylinders. That is, the suspension cylinders can not quickly respond to steering conditions, and therefore a vehicle body roll in the initial period of a turn can not be prevented.
In the detection of the steering angular velocity, when the vehicle is turned on a fixed circle with the steering wheel fixed at a prescribed steering angle, the damping force of the outer suspension cylinders can not be increased and accordingly it is impossible to prevent a body roll.
SUMMARY OF THE INVENTION
The present invention overcomes the drawbacks of the prior art and has for its object to provide a suspension cylinder control system for motor vehicles which is capable of preventing a body roll with a delay of response on turns, particularly on turns at a high speed over a specific vehicle speed, and also preventing a body roll on turns on a fixed circle.
Another object of the present invention is to provide a suspension cylinder control system for motor vehicles which is capable of obtaining the optimum suspension characteristics according to vehicle load and also to improve driving stability by intensifying the damping mode of the suspension cylinders when the vehicle speed has increased over a specific speed.
Another object of the present invention is to provide a suspension cylinder control system for motor vehicles which is capable of preventing a nose dive (a downward plunging of the front end of the vehicle body) by intensifying the damping mode of the suspension cylinders at the time of brake application and, on the other hand, preventing the nose up of the vehicle body by intensifying the damping mode when unloading the load from a dumping body.
The present invention, according to its first embodiment, accomplishes the aforementioned objects by providing a suspension cylinder control system for motor vehicles which comprises suspension cylinders mounted between the vehicle body and the right and left front wheels and between the vehicle body and the right and left rear wheels, a pressure sensor which detects the inside oil pressure of each of these suspension cylinders, a steering angle sensor which detects the steering angle of a steering wheel of the vehicle, and a controller which receives a detection signal from each of these sensors and outputs, from the steering angle sensor, a signal to increase the damping force of the suspension cylinders in accordance with the steering angular velocity until an oil pressure difference of the right and left suspension cylinders of the front and rear wheels decreases below a fixed value.
According to the second embodiment of the present invention, there is provided a suspension cylinder control system for motor vehicles whic
Bertsch Richard A.
Kabushiki Kaisha Komatsu Seisakusho
Tyson Karin
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