Computer aided calculation and experimental verification of response time of pneumatic brake system for 4x4 heavy duty vehicles

Main objective of this study is to obtain a detailed dynamic model ofpneumatic brake system that will be verified with vehicle tests and beused for response time prediction of 4x4 heavy duty vehicles. hence, in this study, a general mathematical model is proposed to determine thedynamic characteristics of pneumatic brake system. for this purpose,first of all the details of pneumatic and mechanical subsystems of the airbrake system are investigated. after that; in order to be able to execute the simulations, mathematical equations derived are adapted to the simulink model. when constructing the simulink model, some system parameters are obtained from the basic models in the literature and/or are taken from the technical datasheets of the brake system components. since a more complicated pneumatic brake system is aimed to be modeled, much more system parameters are required to be estimated. to identify those unknown parameters, response time tests were performed on a4x4heavy-duty vehicle equipped with wedge drumbrakes. the experimental results of those tests are used to tune the system model for the unknown parameters. after that, the model obtained is adapted to a prototype level 4x4 heavy duty vehicle and the break response time calculations are verified.