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.

There is a huge shift in Indian emission standards and that had made a huge impact on engineering work allied with engines and their AFT devices. The piston is most loaded with thermomechanical stresses and early detection of failure can save much time, cost and overall organization can focus to make more robust, technically fit, and reliable products to market. So, it is important to know the effect of engine operating conditions on power cylinder components and other related systems during the development phase of an engine. The operating temperatures are known to be affected by various calibration/control parameters relating to sub-systems like air handling, injection, and cooling systems. These are often tuned based on performance and emission requirements. In this work, a detailed experimental investigation has been reported about the effect of key calibration parameters and boundary conditions on the temperatures of the power cylinder components of a multi-cylinder medium-duty DI diesel engine. Temperatures at various power cylinder locations have been measured using the telemetry technique for parametric variations. The telemetry technique is to measure the piston temperature in real-time. Peripheral system parameters impact on piston and cylinder bore temperature has been studied with different DOE’s. From the injection system, the effect of rail pressure (RP) and SOI variation, from the cooling system, the effect of top tank temperature, CAC out temperature, and the pressure difference across the CAC has been experimentally studied. From the air handling system, the effect of compressor inlet temperature (CIT) and turbine outlet pressure (TOP) has been studied. Results of interaction and main effects for individual factors are discussed. The parameters e.g. TOP, CIT, RP, and CAC delta pressure have shown the weaker effect on the piston temperatures. The change in coolant out temperature had shown 90-99.5% correlation with piston and bore temperatures