#Development of anti lock braking system drivers#

In today’s fast moving world, automobiles are facing challenges in terms of having to survive road accidents, increasing traffic, bad road-conditions and high/express ways. The main goal is to improve the performances of existing traction control systems and the feasibility of fuzzy controllers in automobile applications. Confirmation of these results, obtained with the experimental ABS, have to be validated during vehicle testing. The results obtained indicates the viability of fuzzy logic for wheel slip control. The operating conditions experienced by an ABS are closely simulated in order to study the feasibility of fuzzy logic for traction control. The control algorithm is tested with an experimental setup.

The central theme of this research is the development of a fuzzy logic control algorithm for vehicle traction control. Differing road surfaces can greatly influence the effectiveness of these systems. These systems are however mechanically complex, while the operation of both these systems is usually triggered when some wheel slip value is exceeded. Currently there are various ABS and ASR systems available, with the common goal of optimising wheel slip. Optimising the wheel slip values has several advantages: both vehicle stopping and acceleration distances can be optimised, vehicle handling during in-turn braking and acceleration are optimised and tyre wear is reduced. This optimum wheel slip value will however change with differing road surfaces and vehicle speeds. Since the friction between a vehicle's tyre and the road surface is a function of wheel slip, there is an optimum wheel slip value at which the best road holding performance can be achieved. During braking, wheel slip is controlled with ABS, while wheel slip during acceleration is controlled by an ASR. Traction control includes Antilock Braking Systems (ABS) and Antislip Regulation Systems (ASR). Simulation results are presented and discussed for five road surfaces to indicate the overall performance of this technique.Īdaptive traction control can greatly enhance the mobility of vehicles on varying road surfaces. The formulation of an optimization problem to determine these variables permits the generation of shear forces which correspond fairly well with the empirical data. In this study, nonlinear programming strategies are applied to an analytical tire model to facilitate the selection of system variables. However, this approach may lead to problems in correlating the simulated system performance with actual vehicle tests. Frequently, experimental tire data gathered over a limited number of road surfaces is extrapolated to test antilock brake systems on a variety of roads. An important consideration in the simulation of the vehicle and brake dynamics is the generation of the shear forces and aligning torques at the tire/road interface. The cost effective design of antilock brake systems for automobiles requires the use of computer aided design and analysis techniques, as well as traditional invehicle testing. Analysis and modeling of empirical data collected from an extensive full-scale vehicle test program are presented, along with techniques for deriving a brake assessment algorithm. The measurable parameters of interest are discussed, along with how they will be monitored. A discussion of IBWD design philosophy and methodology is presented. In addition to the safety benefits, IBWD will enhance commercial vehicle productivity by reducing unnecessary delays at inspection points and by boosting overall acceptance of other intelligent transportation system technologies.

#Development of anti lock braking system drivers#

It gives drivers adequate time for corrective action and provides maintenance personnel and authorities with valuable information for improved servicing and inspection activities. IBWD performs an on-board, real-time assessment of vehicle brake performance through measurement of a relatively small number of parameters. Recent improvements, including automatic slack adjusters and antilock brake systems, are not sufficient to ensure adequacy of brakes. Currently, the only active warning is for low air pressure drivers receive no information about the effectiveness of the total system. Air brake systems on multiaxle vehicles are particularly sensitive to brake adjustment and provide poor feedback of deteriorating performance to drivers. Recent statistics show that a disturbing proportion of commercial vehicles are operating with brakes that are out of adjustment or otherwise improperly maintained. Research is leading to development of an on-board, intelligent air brake warning device (IBWD) for commercial vehicles equipped with such brakes.