Title:
DIGITAL SUSPENSION SYSTEM
Document Type and Number:
WIPO Patent Application WO1991011339
Kind Code:
A3
Abstract:
A digital suspension system for a wheeled vehicle incorporates digital hydraulic actuators (42) at each wheel and includes a system for sensing lateral and longitudinal accelerations (18, 24) of a body portion of the vehicle and the position of each wheel (10, 12, 14, 16) relative to the body and provides this information to a computer (28). The computer computes the forces required at each wheel and controls the digital hydraulic actuator at each wheel by adjusting in increments the force applied at each actuator between the wheel and the body to maintain the body portion of the vehicle in a substantially stable position. Preferably the hydraulic actuator used in the suspension system will be formed by an assembly including a first element, a cylinder, a body section and a chamber. The first element is provided with a first set of a plurality of different sized piston cavities and piston elements which cooperate with a second set of piston elements and piston cavities respectively formed on a second element. The second element forms a piston in cylinder. The body sides incorporate, preferably in symmetrical relationship around the axis, of the assembly a plurality of valves, one valve for each of the pairs of cooperating pistons and cavities. A piston divides the chamber into a high pressure reservoir and a low pressure reservoir with the piston being urged toward the high pressure reservoir to maintain a difference in pressure between the high and low pressure reservoirs. Passages connect each of the valves to the high and low pressure reservoir and each of said cavities with its respective valve adapted to selectively connect its respective cavity to either the high pressure reservoir or the low pressure reservoir.
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Inventors:
DUNWOODY ANDREW BRUCE (CA)
Application Number:
PCT/CA1991/000026
Publication Date:
April 02, 1992
Filing Date:
January 31, 1991
Export Citation:
Assignee:
UNIV BRITISH COLUMBIA (CA)
International Classes:
B60G17/00; B60G17/015; B60G17/04; F16F9/10; (IPC1-7): B60G17/04; B60G17/01; F15B15/12; F15B15/14
Foreign References:
| CA1230657A | 1987-12-22 | |||
| DE3836103A1 | 1990-04-26 | |||
| US4602481A | 1986-07-29 | |||
| DE3938611A1 | 1990-10-04 | |||
| DE871557C | 1953-03-23 | |||
| DE3803009A1 | 1988-09-08 | |||
| US2593040A | 1952-04-15 | |||
| US4639013A | 1987-01-27 | |||
| GB432382A | 1935-07-25 | |||
| DE1776078A1 | 1971-09-09 | |||
| GB1282101A | 1972-07-19 | |||
| FR2112232A1 | 1972-06-16 | |||
| US3068023A | 1962-12-11 | |||
| EP0110024A1 | 1984-06-13 | |||
| EP0236742A1 | 1987-09-16 | |||
| FR1399788A | 1965-05-21 |
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