GT-Power simulation of light-duty turbo diesel engine (1.9 L) with electrified water pump to explore efficiency improvements.

The intend of this Master’s thesis work is to explore the possibility of implementing electric coolant pump or an electrified cooling system that provides the means of controlling the circulation rate of coolant through the engine, which helps the engine to get hot faster and reducing the cold start time/period. The assessment is performed using the simulation software GT-Power on a Transient Warm up Drive Cycle Split Cooling. The work starts with a bibliography review about researches with an electrified cooling system, to increase the vehicle performance and fuel efficiency. In this thesis work, the electrified cooling system has been developed starting from the given model (1.9L Light-Duty Turbo Diesel Engine) which has been built for previous project in University of Michigan, USA. Using the model in GT-Power i.e. Transient Warm-Up Drive Cycle with split cooling, the electrified cooling system is modified and made it consistent with the 1.9L engine model. Simulating four different cases using the entire NEDC (New European Driving Cycle), it has been found that, electrified water pump running at 3000 RPM or more than that, the fuel consumption increases and oil temperature tends to increase slowly as compared to water pump running @1000 RPM. On the contrary, when electrified water pump running at 2000 RPM or lower, it requested less electric power and provide benefit of fuel consumption and it shortens the engine warm-up time (cold phase). Another case is used which is called as Profile Transient, in this case Electric Water pump is OFF for half the cycle but then turned ON for the remaining cycle. In this case, the fuel consumption is increased as compare to electric water pump running at 1000 RPM. It resulted that Electrified Water Pump system requires electric motor and battery, but still installing these, we have benefit of fuel consumption of 1% and shortens warm-up time with respect to baseline engine model.