Boots – shoes – and leggings
Patent
1991-02-14
1993-02-23
Black, Thomas G.
Boots, shoes, and leggings
280707, 188267, B60G 17015
Patent
active
051896150
DESCRIPTION:
BRIEF SUMMARY
STATE OF TECHNOLOGY
The invention concerns a method for the suspension control of vehicles, in particular motorcars and commercial vehicles, with the following steps: sensory ascertainment of the dynamic rolling condition and processing of the established rolling condition data, to generate a control signal for a semi-active damper, preferably one allocated to each wheel of the vehicle, the damping force of which is adjustable in certain situations which are dependent on the driving condition, to as small a value as possible.
The design of suspension control systems always demands a compromise between comfort and safety of travel. An ideal suspension should absorb the vibrations occasioned due to unevennesses in the road surface, at the same time maintaining the wheel contact forces as constant as possible at a predetermined value, since the wheels will thereby obtain the best lateral traction, thus controlling the vehicle with maximum safety.
Conventional vehicles have a passive damping system, which means that a damper is arranged parallel with the spring arrangement of a wheel, and this damper has a particular fluid damped piston. Tensive and compressive forces effect a displacement of fluid, whereby the fluid passes through a valve opening area.
In an active suspension control, actuators are employed which have a cylinder divided by a piston into two operating chambers. A pressure medium can (actively) be admitted into or discharged from the two operating chambers, so that, depending on the pressure medium, any desired force can be set. If the damping force is shown over the piston speed in a cartesian coordinate system, then the characteristic curve can be in all four quadrants, i.e. deviating from the passive system, where the operating points can be only in the first and third quadrant (positive damping force and positive piston speed; negative damping force and negative piston speed), it is possible with active damping to achieve negative piston speeds even with positive damping force, and positive piston speeds with negative damping force. By employing the appropriate energy for the control of the pressure medium, the wheel assigned to the suspension in an active system can be moved up and down so quickly that it follows the unevennesses of the road, making the requirements for an optimum suspension design very nearly fulfilled. However, the active system requires a correspondingly high expenditure in apparatus and energy.
Good results are also obtained with a semi-active suspension control which is far superior to the conventional, passive systems. In a semi-active system, the damper hardness can be adjusted. To this end, a semi-active damper has a controllable valve opening area for the pressure medium which is displaced by the piston. Depending on the rolling condition, the damper force is matched to the prevailing conditions, by adjusting the valve opening area of a regulating system.
Semi-active suspension control systems have become known, in which the damping characteristic can be changed over from being related to the road condition and/or rolling condition, thus providing a variation of the damping characteristic. However, this enables the damping characteristic to be only approximately matched to the current requirements, and to do this in successive steps, in such a way, for example, that with a smooth road surface and an even travelling speed, minor damping is obtained, and with an uneven road surface or dynamic travelling manoeuvres (braking, rapid steering manoeuvres), higher damping is achieved. The obtainable results cannot fulfil high requirements.
From the DE-OS 35 13 128, a device for damping progressive movements is known, which employs a semi-active damping system, the characteristic of which is to be approximately matched to an active system. For this purpose, it is intended that the damping system should be capable of being arranged, dependent on certain operating conditions which are detected by sensors, into a condition in which the damping force is nearly zero. This cond
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Gatter Klaus
Haegele Karl-Heinz
Panther Michael
Rubel Erich
Auchterlonie Thomas S.
Black Thomas G.
Robert & Bosch GmbH
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