A Study on Performance of Common Rail Direct Injection Engine with Multiple-Injection Strategies

Abstract

Diesel engines are robust and reliable besides their good fuel economy. However, these engines produce higher exhaust emissions with fossil diesel and further these emissions level increases when operated on biodiesels. A common rail direct injection (CRDi) engine shows higher brake thermal efficiency (BTE) and lower emissions as compared to compression ignition mode (CI mode) of engine operation. This research paper revealed the results of diesel engine operated in CRDi mode with single injection (SI) and multi-injections (MI) of fuel using diesel and biodiesel of honne oil at 80% load. The CRDi engine operation with both SI and MI showed higher BTE and lower emissions as compared to CI mode. The peak pressure and heat release rate of a CRDi engine operation were lower as compared to CI mode. Overall, it could be concluded that biodiesel-powered CRDi engine with double injection and triple injection could reduce oxides of nitrogen (NOx) emissions by 40.8% and 50%, respectively, while smoke emission by 10% and 16.6%, respectively. However, there was a little penalty on BTE and brake-specific fuel consumption.