Analysis of energy flows in engine coolant, structure and lubricant during warm-up

Improving engine warm up time is of great interest because cold start engines suffer from increased fuel consumption. This study comprises of two phases: the first looking at global benefits from a novel engine cooling system incorporating coolant flow control valves and dual EGR setup. The new cooling system showed promising signs of influencing energy flows during warm up, however only limited analysis was possible. The second phase used an instrumented engine to show new ways of quantifying performance enhancements through combustion chamber heat transfer, local bearing oil film temperatures and bearing heat transfer. 1 dimensional heat transfer analysis demonstrated the significant energy required to warm up the engine structure and 25-50kJ heat loss per main crank shaft bearing.