An Experimental Study to Understand the Effect of Calibration Parameters and Operating Conditions on Piston and Cylinder Bore Temperatures for a Multi-Cylinder DI Diesel Engine through Piston Telemetry

In a bid to adopt pro-active strategies to reduce pollution, the Indian government decided to leapfrog from current emission norms to the advanced emission regulations like BS VI, CPCB4. The advancement in emission regulation is also accompanied by customer expectation of increased product performance with lower cost. Downsizing of the engines has led base engine components to experience more thermomechanical loads. Lower product cost demand of the market has pushed engineers to understand the system level interactions and identify the levers other than component design changes. Current analytical techniques provide little iteration feasibility to explore all the possible levers. This paper focuses on experimental study to understand the effect of engine operating conditions on piston and bore temperatures. Piston telemetry technique is used in capturing the real time piston temperature data with flexibility to carry out design of experiments. Bore temperatures were measured using thermocouples. Impact of variation in Rail pressure (RP), injection timing (SOI), engine coolant out temperature, delta pressure and temperature across CAC, Compressor inlet temperature (CIT) and turbine outlet pressure (TOP) were studied. Results of main and interaction effects for individual factors are discussed. Engine COT and injection timings identified as major levers showing linear relation. Other parameters were found as a minor contributing factor, even though those are critical in engine performance tuning.