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A Development System for ABS and Brake Force Distribution Control
Published October 17, 1994 by Society of Automotive Engineers of China in China
A development system for the antilock brake system (ABS) and brake force distribution control is presently under development in the Laboratory of Automotive Engineering, Helsinki University of Technology. The system consists of a general purpose microcomputer, a multifunction I/O card, a high pressure hydraulic pump-accumulator unit, and four pressure sensors, four angular speed sensors, four solenoid valve blocks installed at each wheel. The use of a personal computer and the modularization of hydraulic components provide the possibility to develop and test different ABS algorithms, and to accommodate various types of brake circuit arrangements. Brake force distribution control can also be optimized with this system design. Other functions that the system will perform include simulation of pedal feeling, study of brake response to certain failure modes by disabling individual wheels, etc. The system can be used both for research work, and for educational purposes as well.
This paper provides a detailed description of the system, and summarizes the research work in the first development phase. Special attention has been paid to the pressure behavior during ABS actuation. A hydraulic model for the system and the valve characteristics have been studied. Present results and suggestions for future research are given as well.