Vehicle suspension system with continuously adaptive shock absor

Details Vehicle suspension system with continuously adaptive shock absor Vehicle suspension system with continuously adaptive shock absor

1997-11-03

2000-12-26

Swann, J. J.

Land vehicles

Suspension modification enacted during travel

Priority assignment between diverse control criterion

280124157, B60G 1700

Patent

active

061646652

ABSTRACT:
A vehicle suspension system that varies its shock absorption maximize comfort when compatible with safe handling. Level sensors are positioned to determine the position and attitude of the body of the vehicle in relation to its axles. An electronic regulator controls adjustable air springs to maintain the desired position and orientation of the body. Each air spring can be filled from a compressed-air supply to raise the body, and the system can also bleed air off to lower the body. The electronic regulator also accepts a signal from a double-differentiation device that is connected to the output of one of the level sensors. This signal is a measure of the acceleration of the body, and it is used to compute a bad-road parameter. The bad-road parameter also depends on the change in acceleration that occurs between successive measurements. The electronic regulator calculates a body-shock absorption requirement from the outputs of the level sensors and then uses the bad-road parameter to compute the total shock absorption required from the variable shock absorbers. On a bad road, when the body shock absorption is low, the total shock absorption is increased to provide better handling. When the body shock-absorption requirement is medium, the total shock absorption is lowered on a bad road to increase comfort or safety of loaded goods. When the body shock-absorption requirement is high, safe handling takes precedence over comfort on a bad road, but the total shock absorption may need to be lowered to avoid damaging the suspension system.

REFERENCES:
patent: 5242190 (1993-09-01), Morris
patent: 5346246 (1994-09-01), Lander et al.
patent: 5484162 (1996-01-01), Kanoh et al.
patent: 5697635 (1997-12-01), Koster et al.
patent: 5725239 (1998-03-01), De Molina
Wabco Brochure No. 826 001 1743, entitled "ESAC--Electronic Shock Absorber Control" (1994).
K.H. Schonfeld, "Electronically Controlled Air Suspension (ECAS) For Commercial Vehicles," Commercial Vehicle Suspensions, Steering Systems, and Traction, SP-892, No. 912671, Nov. 1991, pp. 15-24.

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