Abstract
Currently, modern vehicles are equipped with electronic systems to improve their performance and safety. Antilock Braking System (ABS) is a well-known electronic system that helps to improve vehicle stability and safety. The main device of ABS is an electronic control unit (ECU), which determines the working state of the wheels and sends signals to the actuator to prevent the wheels from skidding. Studying, designing and testing of ABS’s electronic control unit have signification for the development of Vietnamese automotive industry.
The article presented the results of the study, design and testing of an ABS ECU made for experimental model in laboratory. The core of the ECU is microcontroller ATMEGA 8535L produced by Atmel Corporation. The ECU includes a communication unit, by which personal computer can connect the ECU and display the graph of wheel speed in braking process. The ECU was tested on an experimental model in two cases: normal brake (ABS is not activated) and heavy brake (ABS is activated). When the ABS is activated, braking process includes three states: increasing pressure, holding pressure and reducing pressure. At a point of time, the braking system is in one state but at next point of time it can change to another if the conditions for changing state are satisfied. The results of testy with the ECU shows that the graphs of wheel speed variation are similar to the ones published in literatures. The study created more bases for Vietnamese companies to produce ABS ECU for automobiles made in Vietnam.
Keywords: Antilock braking system (ABS), Electronic control unit (ECU), Experimental model