All New 1.2L Turbocharged Gasoline Direct Injection Engine from Tata Motors

There is continuous push from the legislation for stringent fuel economy and emission regulations while the modern customers are demanding more engaging driving experience in terms of performance and refinement. To meet this Tata Motors has developed an advanced 1.2L 3-cylinder turbocharged gasoline direct injection engine. This next-generation powertrain delivers optimum efficiency, reduced emissions, superior performance with refined NVH characteristics. The key features used to enable these demanding requirements includes a 35 MPa fuel injection system, Miller Cycle operation and electrically actuated variable nozzel turbocharger (VNT). A uniquely designed BSVI complaint (WLTP ready) exhaust after-treatment system with Four-Way Conversion Catalyst (FWC^+TM) ensures optimum emission control. A centrally mounted variable cam phaser minimizes pumping losses. The lightweight yet rigid all-aluminum engine structure, featuring an integrated structural oil sump, enhances durability and stiffness. These technology packages coupled with right engine management system results in over 15 % better brake thermal efficiency (BTE) and 24% higher low end torque as compared to its predecessor 1.2L TC MPFI engine. The engine delivers 208 Nm/l transient torque density and 225 Nm of Maximum Torque along with 125ps Maximum Power. This paper details the engine’s layout, combustion system optimizations and comparative studies on injector selection, fuel spray patterns for achieving right performance, emissions and NVH.