DE3406875A1 - VIBRATION DAMPER FOR VEHICLES - Google Patents

Description

PRP 447.: -.-..- 3 - ■ '---' ■ - ' - February 23, 1984

Vibration dampers for vehicles

The invention relates to a vibration damping system for vehicles with at least one each in the area of the vehicle wheels and the vehicle body A damping element is provided which accommodates a working space which is divided into two sub-spaces by a piston of damping medium, the two sub-spaces connected to one another via at least one damping valve are.

Hydraulic telescopic vibration dampers are known (e.g. DE-PS 26 55 7o5, DE-PS 27 44 3o1), in which a working space is divided into two sub-spaces by a piston the damping piston is responsible for generating the damping force has necessary valves of mechanical design. Such a conventional vibration damper has the disadvantage that the corresponding damping characteristic is permanently adapted depending on the vehicle type and thereby must meet a compromise of different driving conditions. Such a vibration damping one Vehicle with telescopic vibration dampers is through the restricted parameters in the operating state are accordingly narrowly limited, with different ones in addition Influence loading conditions on the system.

In addition, a method for active vibration damping is known (e.g. DE-OS 27 38 455), in which the Damping force can be adjusted. Here, however, is the disadvantage that the attenuation losses via an external arranged pump must be reintroduced. A

PRP 447 -; ___-: 4 ■ -'--- ''./-"I'02/23/1984

Such a system with the supply of external energy requires an additional, externally fed hydraulic system and is therefore very time-consuming. Not all vehicle types have or even leave such additional hydraulics to. In addition, if this externally arranged pump fails, driving safety is no longer given because the entire system fails.

Proceeding from this, it is the object of the invention to provide a vehicle damping system to be provided with a variable, intelligent electronic damping adjustment in which an optimization of driving comfort, driving safety and driving behavior during the Driving operation can be achieved.

To solve this problem, the invention provides that at least one damping valve as electronic controllable valve is formed, which is controlled via an adapted electronics.

The advantage of this solution is that the damping valve electronically can be variably adapted to the respective road and vehicle condition. The existing mechanical Valves, which serve the basic damping, guarantee with a possible failure of the electronics the driving safety. It is also advantageous that by such Control at the same time the wear as well as the manufacturing tolerances and temperature-related changes in the damping system can be compensated.

According to a further essential feature it is provided that the electronics of at least one of the movement variables between the vehicle wheel and the vehicle body Sensor is acted upon. With the help of a corresponding sensor, after determining the corresponding Parameter made a further adjustment of the damping valve. It can be the loading and driving status of the vehicle as well as the speed or the corresponding

PRP 447 · - - 5 * - "-: .-" - ': 02/23/1984

Temperature in the system must be taken into account.

A problem-free design of the damping system can also be achieved by using the data from the front axle can be used as signals for the rear axle. In addition, a corresponding Number of sensors create a multivariable control system.

According to a further essential feature it is provided that the valve is arranged outside the working space of the damping element. The structure is based on the The modular principle is possible, with subsequent retrofitting if necessary, even with a corresponding basic construction is possible. If such a principle is provided directly, a correspondingly simple structure of the entire damping system possible.

Another preferred embodiment provides that the valve with the throttle valves arranged in the working space and / or bottom valves cooperates. at This type of cooperation is the conventional damping system by switching on an electronic controllable valve designed according to variable.

Another embodiment provides that the valve is arranged in the area of the piston. Here, too, the damping valve is designed so that one electronically controllable influencing of the damping cross-section is possible.

To achieve a compact system it is provided that a sensor in the interior of the working cylinder arranged piston travel sensor is used. Here lets the geometry of the damping

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Take advantage of the elements by using the piston displacement sensor as a tubular capacitor is used to generate the corresponding measurement signals. The piston rod of the damping piston can serve with its cavity to accommodate such a sensor.

To achieve a multi-variable control system, it is provided in an embodiment of the invention that at least one Sensor is provided, with at least one of the measurement signals such as damping force, distance, speed, acceleration, Temperature, frequency is detected.

It has been shown to be particularly advantageous if a proportional valve is provided as the valve.

Preferred embodiments of the invention are in Drawing explained in more detail:

It shows:

Figure 1 shows a damping element with an electronically controllable Sectional damping valve

Figure 2 shows a two-tube damper in principle as already shown in Figure 1 with the difference that the damping medium only circulates in one direction

FIG. 3 shows a two-tube damper, shown in principle as in FIG. 2, with a piston rod in the hollow integrated sensor

FIG. 4 shows a twin-tube damper in principle as shown in FIG. 2, in which the electronically controllable valve is arranged laterally to the longitudinal axis of the damper is

PRP 447 -7- February 23, 1984

The schematic representation of a damping element shown in FIG. 1 essentially consists of the housing 1, which is connected via a fastening device 2 to a wheel guide member (not shown) and the piston rod 3, which via the fastening device 4 is attached to the vehicle body. Within the working cylinder 5, the upper working space 6 and the The lower working chamber 7 is separated from one another by a damping piston 8 fastened to the piston rod 3.

The damping piston 8 is provided with a pressure damping valve 9 and a train damping valve 1o equipped. Another pressure damping valve is located in the bottom 11 of the working cylinder 12 and a check valve 13 are arranged. Upper the cross-sections 14, the volume displaced by the piston rod 3 is displaced into the compensation chamber 15.

The annular space arranged outside the compensation space 15 16 is connected via channels 17 and 18 with the upper working chamber 6 and the compensation chamber 15, whereby from the compensation chamber 15 via the cross-sections 14 and the check valve 26, the flow connection in the lower working space 7 is guaranteed. In this flow connection it is electronic controllable damping valve 19 arranged, wherein the Armature shaft 2o, depending on the control, closes the channel 17 or allows a variable fluid circulation. The damping valve 19 consists in detail of the armature shaft 2o, the Armature 21, the coil 22, the spring 31 and the connections 23. The armature space 24 can be flooded with damping medium.

The damping valve 19 is via the connections 23 of the Electronics controlled according to the recorded parameters, so that depending on the position of the armature shaft Channel 17 influenced in terms of cross-section, a certain damping characteristic can be achieved.

The compensation space 15 can be filled in its upper region 27 with a gaseous medium, depending on the requirement and task of this medium pressureless or under Pressure can stand.

Figure 2 shows an embodiment as it is in principle is already shown in Figure 1, but the damping piston 8 only a check valve 25 and the base 11 also has a check valve 26 is provided so that the damping medium only in one UmI erection can flow. This erection takes place from the upper working space 6 via the channel 18 and the annular space 16, the channel 17 past the damping valve 19 in the lower working space 7. With this damping element, the circulation of the damping medium is important, because the actual damping control takes place exclusively via the cross-section adjustment of the damping valve 19. The compensation chamber 15 can be filled in its upper region 27 with a gaseous medium, wherein this medium depends on the requirements and the task at hand can be pressureless or pressurized.

Figure 3 shows an embodiment in principle as in Figure 2 already shown with the difference that the piston rod 3 is provided with a cavity 28, which is used to accommodate a sensor 29. This sensor 29 gives the corresponding from it via the connections 3o measured parameters to the electronics, from there via the connections 23 the control of the Damping valve 19 takes place. The sensor 29 can be on the The base of a tubular capacitor can be formed, the tubular components being a capacitive half-bridge form.

Figure 4 again shows an embodiment which corresponds in principle to that shown in Figure 2 with the difference that the damping valve 19 is laterally is arranged to the longitudinal axis of the damping element. Here again there is the connection from the upper working space 6 via the channel 17 to the compensation space 15, whereby from the compensation space 15 over the cross-sections

PRP 447 ■ "- - '9" - ■ - " ^: February 23, 1984

14 and the check valve 26 the flow connection in the lower work space 7 is guaranteed. The damping valve 19 itself is identical in structure with those already shown in the other exemplary embodiments.

List of reference symbols

1 - housing

2 - fastening device

3 - piston rod

4 - fastening device

5 - working cylinder

6 - upper work area

7 - lower work space

8 - damping piston

9 - Pressure dampening valve

10 - train damping valve

11 - floor

12 - Pressure dampening valve

13 - check valve

14 - bore / cross section

15 - compensation room

16 - annulus

17 channels

18 channels

19 - damping valve

20 - armature shaft

21 - anchor

22 - coil

23 - Connections

24 - anchor room

25 - check valve

26 - check valve

27 - upper area of the compensation space

28 - cavity

29 - sensor

30 - connections

31 - spring

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Claims (8)

BÖGE GmbH .: ... / - f .. '.:!. ./: "February 23, 1984 Bogestrasse 5o PRP 447 52o8 Eitorf St. / Thu Claims Vibration damping system for vehicles, in which at least one damping element is provided in the area of the vehicle wheels and the vehicle body, which has a working space divided by a piston into two sub-spaces for receiving the damping medium, the two sub-spaces being connected to one another via at least one damping valve,
characterized, that at least one damping valve is designed as an electronically controllable valve (19) which via an adapted electronics is controlled. 2. Vibration damping system according to claim 1, characterized, that the electronics of at least one of the movement variables between the vehicle wheel and the vehicle body sensing sensor is applied. 3. Vibration damping system
characterized, that the valve (19) outside the working cylinder (5) of the damping element is arranged. PRP 447;. \ .. r 2-- ^: .: Λ ^; ._-: February 23, 1984 4. Vibration damping system according to claim 3, characterized by O 4 U O O / that the valve (19) with the throttle valves (9, 1o) and bottom valves arranged in the working space (12, 13) cooperates. 5. Vibration damping system, characterized in that that the valve (19) is arranged in the region of the piston (8). 6. Vibration damping system, characterized in that that a piston travel sensor (29) arranged in the interior of the working cylinder (5) is provided as the sensor. 7. Vibration damping system, characterized in that that at least one sensor is provided, with at least one of the measurement signals such as damping force, Distance, speed, acceleration, temperature, frequency is recorded. 8. Vibration damping system, characterized in that a proportional valve is provided as the valve (19) is.