Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1980-02-08
1982-08-24
Peters, Jr., Joseph F.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
280 6H, 280112A, 280772, B60G 21006
Patent
active
043456618
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a system for preventing lateral inclination or roll of a vehicle body while the vehicle is being turned.
BACKGROUND ART
When a vehicle is steered so as to be turned by the driver, the vehicle is subjected to centrifugal forces tending to roll the vehicle body radially outwardly of a circular path of travel of the vehicle. Particularly, with modern passenger vehicles with soft suspension springs for increased comfort, the roll develops into a large angle due to the roll moment produced during the vehicle turning, and excessive lateral inclination of the vehicle is experienced, with the results that the driver and passengers will be subjected to discomfort during the turning, and maneuverability and driving safety will be reduced while the vehicle is being turned.
Various anti-roll means have been proposed for preventing a vehicle from rolling while it is being turned.
One such anti-roll means functions by detecting centrifugal forces, i.e., lateral G (acceleration due to gravity), exerted on the vehicle to control the attitude of the vehicle while it is being turned. This arrangement requires a complicated mechanism for detecting lateral G (centrifugal forces), which is more expensive and tends to generally be less reliable than other proposals, and hence is not commercially feasible.
Another proposed anti-roll means takes into consideration the fact that the lateral G is caused by the steering action. The means is arranged to detect the action of steering, instead of the lateral G resulting therefrom, with a view to controlling the vehicle attitude. A general form of such arrangement is disclosed in U.S. Pat. No. 2,893,751, and is advantageous in that it suffers from less phase delay than the prior lateral G detecting system and can be located almost anywhere, while the lateral G detecting system must be located adjacent to the center of gravity of the vehicle. However, this system is not practical mainly because the steering action is often contradictory to the produced lateral G. The greatest contradiction occurs when the steering action is conducted while the vehicle is at rest. That is, the input for steering the vehicle as well as the stroke of the steering wheel becomes maximum and control of the vehicle attitude is made by detecting same, even when the vehicle is at rest and thus no roll moment is produced.
There has been known a power steering system with a reaction chamber, a pressure restricting valve, and a car speed sensor for generating a steering reactive force modulatable by the vehicle speed. The power steering system of this type controls the hydraulic pressure in the pressure restricting valve and the reaction chamber depending on the vehicle speed and the resistance from the road surface to the turning of the steering wheel, thereby generating a corresponding degree of steering reactive force. Introduction of hydraulic pressure modulated and controlled by the vehicle speed for steering reactive force into the suspension units, simultaneous with the detection of steering action, can therefore prevent the vehicle from rolling.
DISCLOSURE OF INVENTION
In view of the problems with the conventional anti-roll systems and the advantages of the power steering system for producing steering reactive forces, the present invention provides an effective, proper and useful anti-roll system that is practically feasible.
An object of the present invention is to provide an anti-roll system in a vehicle equipped with a power steering system for producing a steering reactive force and means for modulating the steering reactive force by the vehicle speed, in which hydraulic pressure for the steering reactive force modulated and controlled by the vehicle speed is introduced into suspension units on either one side of the vehicle depending on a selected steering direction, thereby enabling the suspension units to be lifted or extended so as to prevent the vehicle attitude from being excessively inclined while it is being turned, thereby controlling the v
REFERENCES:
patent: 2893751 (1959-07-01), Hagler
patent: 3396984 (1968-11-01), Cadiou
patent: 3608925 (1971-09-01), Murphy
patent: 3841653 (1974-10-01), Strauff
patent: 3994361 (1976-11-01), Nishikawa
Burt Pamela S.
Hill M. J.
Honda Giken Kogyo Kabushiki Kaisha
Peters Jr. Joseph F.
Shortley John L.
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