Overhead presentation. During the recent years many innovative advanced suspension systems have been introduced into the automotive market with the aim of improving the ride comfort and handling of the vehicles. These new mechatronical systems have often a high level of complexity and costs for the vehicles. Also due to the level of complexity they could show disadvantages in reliability and safety area. Another important factor which is not in favor of active suspension systems is the high energy consumption which contributes to the increased fuel consumption and emissions. Semi-Active Roll Control (SARC) as new product in the TRW advanced suspension portfolio introduces a cost and energy effective concept for the active suspension and in particular roll control systems. The SARC is able to improve the vehicle ride comfort by decoupling the passive stabilizer bar in the straight ahead driving. For applications where improved roll behavior is desired, the SARC enables the possibility to increase the stabilizer stiffness and hence improving the roll behavior during cornering without affecting the vehicle ride comfort in straight ahead conditions. The system is comprised of hydraulic linear actuators with integrated valve, which replace the drop links on one side of the front and rear stabilizer bars. The actuators are able to lock and hence couple the stabilizer bar as in passive systems, or unlock which will result in decoupling of the stabilizer bar. The actuators require no external source of hydraulic energy; hence no external hydraulic connections are required. Only a low current electrical harness is connected to each actuator for switching of the valve for the locking and unlocking function. The control signals for the valves are emitted by an electronic control unit which computes the control signal based on vehicle states available on the vehicle bus. As an alternative the control signals could also be provided by the available ESC control unit in the vehicle and by doing so decreasing the complexity and cost of system further more. The novel actuator design enables unique features which are essential for a smooth and soft operation of the system. The so called ratcheting function enables the re-centering of the actuator in cases where the actuator is locked out of center position. The actuators also enable fast locking response while at same time ensuring a smooth and soft unlocking while under load. This contribution gives an insight to the system design and functionalities. Also the system performance on the vehicle level, concerning ride comfort and handling is discussed.
Semi-Active Roll Control (SARC) - a cost and energy effective contribution to advanced suspension systems
2008
7 Seiten, 9 Bilder
Conference paper
English
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