Analysis of pressure transients in brake system is very important for calculating brake force development, especially for vehicles mounted on ABS (Antilock braking system). This paper introduces an analytical dynamic model of the air-over-hydraulic (AOH) brake system mounted on heavy-duty off-highway vehicle (HOV). The paper relies on physical arguments to develop the mathematic models for the brake system components. And then a generalized AOH brake system, based on the systems analysis level for the components, is formulated in detail. The foundation drum brake is presented with a novel modeling method for the interaction with the apply system. And the pipeline hysteresis and fluid fluctuation of the brake system are well researched. Experiments are preformed on a bench setup and a real vehicle of the AOH brake system and the experimental data is compared with the simulation results. Preliminary analysis shows that the simulation tracks the data closely. These models developed on the physical laws are intended for use in the design and analysis of vehicle control systems for heavy-duty off-highway vehicles. A theoretical model has been developed and described, which characterizes the air and brake fluid flowing dynamics within an AOH brake system. Through a systems level approach, the overall model is synthesized using components models embodying physical laws, and validation studies have been performed in order to compare the simulated predictions with the experimental results. From the analysis and comparison described, it can be concluded that the brake system model for predicting the transient air/brake fluid pressure exhibits sufficient accuracy and validity. The models of the CVs (Commercial Vehicles) AOH brake system will significantly improve the design cycle and produce immediate, quantifiable results. Experimental testing is still necessary; however, dramatic changes in system performance will be predicted at the design stage. Since the developed model is based on laws of physics, estimation of the system level effects stemming from the component design changes will be visible even at the conceptual design stage. It is also important to recognize that the time lag between various axles' braking is unambiguous and cannot be overlooked in the whole braking system design of the CV. In future, the authors would like to use the corresponding models as part of a simulation tool that can assist in determining the ABS control law and the relative parameters for the ABS mounting of AOH brake system.
Dynamic characteristics analysis of brake system for heavy-duty off-highway vehicle
Analyse der dynamischen Kennlinien des Bremssystems eines Hochleistungs-Geländefahrzeuges
2004
11 Seiten, 17 Bilder, 20 Quellen
Conference paper
English
Dynamic Characteristics Analysis of Brake System for Heavy-Duty Off-Highway Vehicle
SAE Technical Papers | 2004
|Dynamic characteristics analysis of brake system for heavy-duty off-highway vehicle
Automotive engineering | 2004
|2004-01-2638 Dynamic Characteristics Analysis of Brake System for Heavy-Duty Off-Highway Vehicle
British Library Conference Proceedings | 2004
|