Riassunto analitico
The objective of this thesis is to illustrate the main stages of engine calibration for racing applications, through the implementation of intake manifold pressure control.
The activity started with the setup of the test room instrumentation and the positioning of the sensors, both on the engine and on the test room auxiliaries. Then, a preliminary calibration of the fundamental parameters for correct engine operation is carried out, followed by the calibration of two power level maps: one designated for the “Standard mode” and one for “Push-to-Pass mode”. The last two steps of the activity are meant to achieve an indicating analysis and evaluate the heat rejection for both water and oil circuits.
The engine on which the work is conducted is the ATM163-T: 1.6 liters, 3-cylinder, 4-stroke, turbocharged unit with Variable Valve Timing (VVT) system. The activities are carried out at the Engine Testing Department of Autotecnica Motori company, based in Casalmaggiore (CR), under the supervision of the Project leader engineer.
The document is organised into chapters. Initially, a descriptive overview of the company and the Championships to which the engine is intended for. Then, a technical definition of the characteristics of the engine under analysis is introduced. Subsequently, the analysis of the working environments is carried on, from the general description of the engine test room to the explanation of the auxiliary tools required for engine calibration and testing activities.
Moreover, a brief description of the setup used for the activity is presented, both on hardware and software side. Then, the pressure control algorithm is explained, pursued by electronic phasing and analysis of the main operating parameters of the engine.
Lastly, torque and power curves are defined for different targets, followed by an indicating analysis to find the optimal spark advance, boost targets and fueling, compatible with the engine's characteristics and knocking limits, and eventually a heat rejection analysis.
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