The study presents one possible test application of an electro-mechanic brake actuator to call attention to the critical questions. The focus is on the wheel-end and its relation to the whole brake system especially in the case of self-amplified mechanism. The tested system architecture contains some constraints relating to the complete behaviour analysis of such a system but against it ensures the best comparison basis with the pneumatic actuators in the same environment conditions. It keeps also the redundancy and safety property of the serial system that can be required during the test of a new safety critical component. Because of the different sensor interfaces of the compared systems additional investigation was required to present basis for the parallel. Although the exact evaluation cannot be without the same sensor the mentioned procedure can approximate satisfactory the normal force of the pneumatic system from the serial sensor of the wheel-end. Obviously the validation of the estimation requires additional reference measurement. Because of the constraint of the self-energising the according ECE R13 definitions should be interpreted more directly for the service and parking brake. Using the wedge brake the switching between the two braking type separates from the human interfaces and it will depend on the vehicle and brake disc motion state. The correspondence to the rules at these conditions can be the subject of consideration. The frequently discussed question, the structure of the electro-mechanic brake system control, has been analysed as well. Focusing to the wheel-end the increasing separation request between the control of the electronic and the mechanic is an evident tendency. It is induced by higher complexity of the motor control against the simple solenoids. However this separation through the well defined interfaces can only ensure clear and manageable structure of the whole control. According to the possibilities of the ABS improvements this study demonstrates the possible base of the comparison between the pneumatic and the electro-mechanic wheelends. In this case the benefits of the different actuator and the control reconstruction are not merged.
Electro-mechanic brake application for commercial vehicles
2007
9 Seiten, 9 Bilder, 5 Quellen
Conference paper
Storage medium
English
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