Boots – shoes – and leggings
Patent
1991-05-29
1994-05-17
Black, Thomas G.
Boots, shoes, and leggings
3644241, 280707, B60G 1126, B60G 1700
Patent
active
053133900
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for suspension control on vehicles, in which the reference damping force (reference value) for at least one adjustable damper with flow-resistance-damped piston is calculated from at least one status variable and used for actuating the damper.
Conventional suspensions have a so-called passive damping system, which means that a damper is connected parallel to the respectively present spring arrangement of a wheel and has, for example, a liquid-damped piston. An expulsion of liquid occurs by means of tensile or compressive forces. In this case, the liquid passes through a through-flow cross-section.
In a so-called semiactive suspension control, dampers are used which have a cylinder which is divided by a piston into two working spaces. A through-flow cross-section which can be controlled from outside is provided for the pressure medium which can be expelled by the piston, so that the damping properties (degrees of damping) can be adjusted. Depending on the vehicle state, the actual damping force is matched to the current conditions by means of a control system by rapidly adjusting the through-flow cross-section. In this way an improvement of the comfort and of the driving safety of a vehicle can be achieved.
It is known to construct a vehicle control according to the Karnopp control concept and to operate it with a semiactive special damper. In the Karnopp control concept, the damping force is adjusted proportionally to an absolute body speed. This so-called absolute body speed is defined between an inertial system (fixed, independent system) and a point on the body of the vehicle. The aforesaid special damper has electrically adjustable pressure control valves by means of which a reference damping force, which is preset by the control circuit, can be fed directly to the damper in order to adjust it. However, special dampers of this kind are very costly.
SUMMARY OF THE INVENTION
In contrast with the above, the process according to the invention having the features specified in the main claim has the advantage that a semiactive damper of simple construction in which there is simply an adjustable through-flow cross-section for the pressure medium which can be expelled by the piston can be used. According to the invention, the actual value of the piston speed of the damper is fed to the damper by means of a family of characteristic curves, taking into account the reference damping force calculated by the control circuit, for the purpose of setting its adjustable through-flow cross-section. Therefore, the family of characteristic curves assumes a matching function in that the output variable calculated in the suspension control system is converted by the family of curves in such a way that a direct actuation of the through-flow cross-section of the damper is possible. The aforementioned, known special damper with electrically adjustable pressure control valves can therefore be dispensed with.
In particular, it is provided that the calculated reference damping force is fed to the family of characteristic curves as an input variable. The reference damping force is preferably calculated according to the Karnopp control concept.
A further development of the invention proposes that the absolute body speed which, as already mentioned above, occurs between the inertial system and the body of the vehicle, be calculated as status variable and the reference damping force be determined from the said absolute vehicle body speed and the relative piston speed (actual value) of the damper acting between the vehicle body and the suspension.
For the calculation of the reference damping force, either a digital or else an analog computing circuit can be used.
According to a particularly preferred embodiment of the invention, the family of characteristic curves carries out a simulation of the damper, an actual damping force being supplied as output variable. This actual damping force is connected, together with the calculated reference damping force, to a controller
REFERENCES:
patent: 4700971 (1987-10-01), Doi et al.
patent: 4887699 (1989-12-01), Ivers et al.
patent: 4936423 (1990-06-01), Karnopp
patent: 4993523 (1991-02-01), Schwemmer et al.
patent: 5020781 (1991-06-01), Huang
patent: 5060157 (1991-10-01), Tado et al.
patent: 5060919 (1991-10-01), Takano et al.
patent: 5089966 (1992-02-01), Fukushima et al.
patent: 5090728 (1992-02-01), Yokoya et al.
patent: 5138554 (1992-08-01), Wada
Japanese Patent No. 58-211044, Patent Abstracts of Japan, vol. 8, No. 57.
Schenk Rene
Schramm Wolfgang
Black Thomas G.
Nguyen Tan Q.
Robert & Bosch GmbH
LandOfFree
Method and apparatus for control and regulation of a vehicle cha does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for control and regulation of a vehicle cha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for control and regulation of a vehicle cha will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-882020