Direct injection diesel engine offers the benefit of better fuel economy over gasoline
engine. Diesel engine with electronic control of high pressure, multiple injections per cycle, 4
valves per cylinder, turbocharged with intercooled, cooled EGR or SCR and DPF have now
become the key features to meet the upcoming emissions in India.
This paper describes the work done on multi-cylinder diesel engine to meet the requirements
of Bharat stage 5 emissions and has the potential to meet Euro6 emission norms. Vehicle
simulation model developed by using AVL cruise software was used to find out the engine steady
state speed-load point’s equivalent to Bharat stage 5 emission test cycle. Engine emission
development was done on test bench using these speed-load points. Engine was optimized with
new hardware, namely piston bowl with reduced compression ratio, high capacity EGR cooler and
turbocharger to attain the desired emission level. Diesel oxidation catalyst and coated diesel
particulate filter (cDPF) loading were optimized to reach Bharat stage 5 emission norms. Vehicle
with Selective Catalyst Reduction (SCR) with average 60% conversion efficiency has the potential
to meet Euro6 norms.