Experimental Investigation on the Port Timing of a Compressed Air Engine with Exhaust Predicting Technique

Abstract

The air engine is one of promising propulsion system in the era of crisis of fossil fuels and demand for efficient, low emission technology. Friction due to conventional cam mechanism created a scope of research to improve the performance of the engine. Camless engine replaces the convention cam by variable valve train mechanism. Variable valve train comprises the electronics solenoid operated direction control valve and have the capability to rising cylinder pressure quick. In the air engine, compressed air entered into the cylinder requires enough time for expansion and the amount of air remains to expand reflects a higher exhaust pressure. Along with this, how quickly released expanded air and their relationship with performance is critical aspects of analysis. In this research, work-study concentrated on intake advance angle (ISA) and exhaust advance angle (EAA) which directly reflects on the amount of air entered and time required for complete expansion. Experiments conducted with the electronics control unit (ECU), predicts exhaust pressure based on expansion takes place in the cylinder. Results evidence of improvement in the performance of the engine with ISA with the controller only. Consequently, the experimental study provides a base for the design and development of self-decisive pollution-free engine system for improved performance.