Intelligent Exhaust Gas Recirculation Governing for Robust BS-III Compliant 2.5 l Mechanical Pump Drive Diesel Vehicle 2013-26-0052

October 2010 has brought major change over in Indian Auto Industries, with all India going BS-III Emission compliant (Metro with BS-IV Emission norms). During that time majority of the utility segment vehicles were having diesel engine with simple mechanical fuel injection system. To make these vehicles BS-III compliance cost effectively, with same fuel economy and reliability, was a challenging task. To enable this, Exhaust Gas Recirculation (EGR) through simple pneumatic EGR valve was the optimum technique. The EGR valve was controlled by means of simple Electronic Control Unit (ECU). Limitations of mechanical diesel fuel injection pump, stringent emission regulations, coupled with production constraints and variations, calls for robust control logics for governing EGR.

The present work describes the robust strategies and logics of intelligent EGR governing of a 2.5 l, four Cylinder turbocharged, mechanical pump diesel engine for a BS-III compliant multi utility vehicle. The vehicle is powered by engine having 63 HP power at 3200 rpm and peak torque of 195 Nm at 1500 rpm to 1800 rpm.

The EGR governing uses feedback type EGR valve and in-house developed EGR controller logics. With the help of intelligent EGR control logics, it was possible to have robust BS-III across high production volume vehicles, cost effectively, without affecting fuel economy and reliability.