Spring-Damper Device for Motor Vehicles, and Level-Regulating System for Motor Vehicles
The invention relates to a spring damper facility for a motor vehicle and a level control system for a motor vehicle. The spring damper facility has a main hydraulic volume and a pneumatic volume separated from the main hydraulic volume interacting with the main hydraulic volume. According to the invention, a decentralised hydraulic compensation volume is present in the spring damper facility, wherein hydraulic fluid from the hydraulic compensation volume can be redirected into the main hydraulic volume and vice versa to change a load carrying capacity of the spring damper facility and thus to provide a change in height or a change in level for the motor vehicle.
1 . A spring damper facility for a motor vehicle with a main hydraulic volume and with a pneumatic volume separated from the main hydraulic volume interacting with the hydraulic volume, characterized in that a decentralized hydraulic compensation volume, wherein hydraulic fluid from the hydraulic compensation volume can be redirected into the main hydraulic volume and vice versa to change a load carrying capacity of the spring damper facility and thus provide a change in height or a change in level for the motor vehicle.
2 . The spring damper facility according to claim 1 , wherein the hydraulic compensation volume is in connection with the main hydraulic volume and that a controllable pumping device serves to redirect hydraulic fluid.
3 . The spring damper facility according to claim 2 , wherein the hydraulic compensation volume is in connection with the main hydraulic volume by way of hydraulic lines, wherein the controllable pumping device together with a non-return valve is arranged in a first hydraulic line, and wherein a controllable drain valve is arranged in a second hydraulic line.
4 . The spring damper facility according to claim 3 , wherein the controllable pumping device and the controllable drain valve are connected with a control or regulating device by way of control lines.
5 . The spring damper facility according to claim 1 , wherein the pneumatic volume is arranged concentrically around the hydraulic volume.
6 . The spring damper facility according to claim 1 , wherein the main hydraulic volume, the pneumatic volume and the hydraulic compensation volume are integral parts of the spring damper facility so that such a spring damper facility without hydraulic and pneumatic connections between the individual spring damper facilities can be assigned to each wheel of a motor vehicle.
7 . The spring damper facility according to claim 1 , wherein the said facility is designed as decentralised, hydropneumatic spring damper facility, wherein such a spring damper facility is decentrally assigned to each wheel of a motor vehicle and wherein all spring damper facilities are connected with a central control or regulating facility by way of control lines.
8 . A level control system for a motor vehicle with several hydropneumatic spring damper facilities, wherein each spring damper facility decentrally has a main hydraulic volume, a hydraulic compensation volume and a pneumatic volume, wherein the hydraulic compensation volume of a spring damper facility is in connection with the main hydraulic volume of this spring damper facility, wherein hydraulic fluid can be redirected from the hydraulic compensation volume into the main hydraulic volume and vice versa to make available a change in height or a change in level for the motor vehicle.
9 . The level control system according to claim 8 , wherein a spring damper facility is assigned to each wheel of the motor vehicle.
10 . The level control system according to claim 8 , wherein a height sensor is assigned to each spring damper facility.
11 . The level control system according to claim 8 , wherein a central control or regulating device, wherein all spring damper facilities and all height sensors are connected with the central control or regulating device by way of control lines.
12 . The level control system according to claim 11 , wherein measurements of the height sensors are input variables for the control or regulating device.
13 . The level control system according to claim 11 , wherein a speed sensor and/or an acceleration sensor and/or a steering wheel angle sensor is/are connected with a control or regulating device, wherein the measurements of these sensors are additional input variables for the control or regulating device.
14 . The level control system according to claim 11 , wherein the control or regulating device generates output variables dependent on the input variables, wherein the output variables are control signals for the spring damper facilities.
15 . The level control system according to claim 8 , wherein with each decentralised decentralized spring damper facility the hydraulic compensation volume is in connection with the main hydraulic volume, and that a controllable pumping device serves to redirect the hydraulic fluid.
16 . The level control system according to claim 15 , wherein with each decentralized spring damper facility the controllable pumping device together with a non-return valve is arranged in a first hydraulic line, and that a controllable drain valve is arranged in a second hydraulic line.