As a semi-active suspension control strategy, the proposed system involves an acceptable performance to cost ratio, improving both comfort and handling when compared to a passive suspension system. Only four additional sensors and a valve response time of 25 ms are required. Note that, for a 'Skyhook' control to be effective at normal driving velocities, a damper valve response time of 10 ms is needed. With the available technology (about 20 ms), skyhook system is really effective for vehicle velocities up to 50 km/h. The control system uses a novel 'type of road' identification module, which adapts the damping level to the type of road every 2 seconds, meaning that is not able to properly react to incidental events. However, since the default damper position is comfort-oriented, the optimal comfort settings are achieved in most cases. If the incidental event appears in a critical handling situation, the proposed damper position will not be optimal, but adopts the same behaviour as a passive damper, meaning that the vehicle safety will not be compromised. The road identification module can also be used in combination with other intelligent control systems in order to adapt their response to the road type. The implementation of this strategy with a shock absorber whose extension / compression damping rate could be separately modified, would improve the damping performance. This improvement is especially relevant in terms of handling when road irregularities cause the wheels contact loss. The controller can be upgraded, by adding new modules. For instance, a useful new function could be to include 'suspension travel limit' detector which could increase the damping rate to avoid the suspension to reach this point. Other handling enhancements regarding cornering manoeuvres can be made in order to avoid or reduce under or over steering.
A semi active suspension system for motorbikes
Eine halbaktive Radaufhängung für Motorräder
2008
15 Seiten, 17 Bilder, 6 Quellen
Conference paper
English
A semi active suspension system for motorbikes
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