Enhanced Vacuum for brake booster with Venturi effect

We normally see that in naturally aspirated Gasoline & CNG engines there is no separate vacuum pump is provided for vacuum brake booster operation. In such vehicles, braking system is solely dependent on vacuum generated by the engine at intake manifold. This vacuum generated by engine has certain limitations. Also there is always variation in vacuum generation by engine due to various operating conditions, engine loads, environmental conditions etc. but brake booster requires stable vacuum for efficient operation. It is observed that in heavy traffic, when frequent braking happens, sometimes brake pedal becomes hard due to lack of required vacuum by engine. This problem is prominent in DCT & AMT vehicles as brake operations are more in these vehicles compared to manual transmission vehicles. Thus braking efficiency decreases resulting in dangerous situation. To avoid this there is always a demand from brake system for more & stable vacuum. To satisfy above requirement, a simple yet very useful & cost effective arrangement of Venturi nozzle is studied & results are explained in this paper. This concept is useful & applicable to motor vehicles using vacuum assisted braking system where vacuum source is solely dependent on vacuum generated by an engine which is available at engine intake manifold & there is no separate arrangement available like independent vacuum pump. Due to venturi effect, vacuum at brake booster is enhanced & always greater than the source i.e. engine vacuum in any condition. Hence helps to maintain the brake performance in all working conditions of the engine. Keywords: Brake booster, vacuum assisted brake system, venturi effect, vacuum requirement for booster, brake force amplification, vacuum intensifier, vacuum pump, venturi nozzle, vacuum booster, hydraulic brake system