Antilock Braking System Controlled Using 555 Timer in Pneumatic System

In today's world, braking is the most important part in an automobile. Brakes are energy conversion devices, which convert kinetic energy of the vehicle into thermal energy and thus due to friction braking happen. In Antilock Braking System, we can prevent the locking of the wheel and hence skidding, using an Electro Mechanical Control System. The main issue behind the locking of the wheels is that, when we apply break it locks the wheel which cause skidding of wheel and because of that the driver lost the control over driving. Around the world, 77% of the accident cases are due to wheel skidding problem, and 19% of them are cause of stopping distance. Antilock Braking system is the best solutions of both of the issues i.e. (Wheel skidding and stopping distance) that occur in the severebraking system. Antilock Braking System allows the motion of the wheel to continuously interact with the road surface as directed by driver's steering input while braking, preventing the wheels from locking up (ceasing rotation) and therefore avoid skidding. In this paper we worked on PCABS i.e. pneumatically controlled Anti-lock Breaking System. The aim of this paper is to give a short overview of working of ABS system controlled using 555 timer using pneumatic systems. Basically ABS is based on hydraulic system but we have worked on pneumatic system. In recent years, with advancement in design & technology, Disc brakes are fastly replacing drum brakes. ABS was first developed for Aircrafts braking system but soon started replacing the conventional braking system in trucks, cars and bikes. Recent improvements in ABS allow preventing wheel when accelerated on wet or slippery surface. An Antilock braking system (ABS) is a safety system that maintain driver control and stability of the vehicle (Like; Bikes, Cars, Trucks, Airways etc.) during emergency braking. In the present scenario of the breaking system (Conventional breaking system), while we apply brakes the wheels are locked & that helps in slowing down a rotated wheel but will not provide steering ability of the vehicle. The main function of the ABS is to curb the wheel locking and thus maintains both, steerability and vehicle stability assuring at the same time shorter stopping distances as compared to locked wheel breaking system on most road surfaces and therefore avoiding skidding.