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Diesel Engine Waste Heat Recovery Utilizing Electric Turbocompound Technology

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Diesel Engine Waste Heat Recovery Utilizing Electric Turbocompound Technology Diesel Engine Waste Heat Recovery Utilizing Electric Turbocompound Technology Department of Energy Contract DE-SC05-00OR-99OR22734 Ulrich Hopmann Caterpillar Inc. 2004 DEER Conference August 30-Sept 2, 2004 San Diego, California Agenda • Program Objectives and Electric Turbocompound (ETC) System Background • Update on Component Developments – Turbo-shaft generator and crankshaft motor – Air handling system – Control system – Component testing • Cost/Value Study • Next Steps and Summary Caterpillar Engine Research Diesel & Emissions Technology Diesel Electric Turbocompounding (ETC) • Primary Objectives: – Demonstrate technical feasibility – Improve fuel economy • Program Goals and Milestones: – Conceive and design optimum ETC system – Develop and bench test turbomachinery – Develop control system and strategy – Rig test ETC hardware – Lab engine test of ETC system Caterpillar Engine Research Diesel & Emissions Technology Caterpillar Engine Research Diesel & Emissions Technology Working Principle Available Turbine Power 2 3 120 FEATURES Power Common Voltage Bus Exhaust Electric 100 Turbine Electronics Gases Loads 80 Compressor Power No mechanical coupling between Surplus 60 turbo and crankshaft Generator 40 Motor Flexibility in turbo operation 20 Turbine Power kW Power Turbine Energy Provides0 turbo-assist capabilities 0 100 200 300 400 Storage Predicted 5 toEngine 10% Power reduction kW in fuel consumption Turbine Cooler 1 Compressor 4 s t Engine u Power p Control n I Electronics Overall 1 2 Motor System 3 Powertrain Engine Generator Controller 4 Caterpillar Engine Research Diesel & Emissions Technology Caterpillar Confidential & Proprietary Agenda Program Objectives and ETC System Background Update on Component Developments Turbo-shaft generator and crankshaft motor Air handling system Control system Component testing Cost/Value Study Next Steps and Summary Caterpillar Engine Research Diesel & Emissions Technology Final Design Water Cooling Rotor/ Bearing Stator Housing Turbine Compressor Caterpillar Engine Research Diesel & Emissions Technology Final Design Caterpillar Engine Research Diesel & Emissions Technology Turbo Shaft – Generator/Motor Rotor Stator Windings Dyno Testing Caterpillar Engine Research Diesel & Emissions Technology Crank Shaft - Motor/Generator 340 Vdc Crank Shaft M/G Electronics Flywheel Housing with Crank Shaft M/G Caterpillar Engine Research Diesel & Emissions Technology Compressor and Turbine Compressor Scroll and Compressor Wheel with Diffuser Design Point Pressure Ratio (t-s) 3.1 Efficiency (t-s) 82%, max. 85% Turbine Scroll and Turbine Rotor with Nozzle Design Point Pressure Ratio (t-s) 3.7 Efficiency (t-s) 84%, max. 85% Caterpillar Engine Research Diesel & Emissions Technology Turbo Shaft & Bearing Housing Turbo Shaft w/ Ball Bearings Rotor Assembly with Balancing Fixture Caterpillar Engine Research Diesel & Emissions Technology Assembled ETC Turbocharger Turbine Housing Housing for Motor/Generator Compressor Volute Proximity Probes Speed Pick-Up Electrical Power Take Off Caterpillar Engine Research Diesel & Emissions Technology ETC Control System System Simulation in Simulink Controller Implemented in dSpace Virtual Instrumentation Capabilities Map Boost / Speed / Load Boost at Optimum Set Point for Fuel Consumption Transient Behavior Boost Control (Engine Speed = 1800 rpm, Variable Pressure Setpoint) Boost and Fuel Consumption vs. Compound Power 1 100 120 0.5 Demand (0-1) Demand 0 % 0 5 10 15 20 25 30 35 % 300 96 100 250 200 Intake Pressure Setpoint 150 Intake Pres. (kPa) Pres. Intake 0 5 10 15 20 25 30 35 ETC Power 92 80 2500 Electric 2000 Relative Boost - Boost Relative 1500 Fuel Consumption - Consumption Fuel Fuel Consumption Controller Electronics Engine 1000 Machine Boost Pressure 500 Crank TQ (N.m) 88 60 0 5 10 15 20 25 30 35 Tim e (sec) 15 25 35 45 55 Compound Power at Turbo Shaft - kW Boost Pressure Feedback Turbocharger Speed Feedback Exhaust Manifold Temperature Feedback Caterpillar Engine Research Diesel & Emissions Technology Component Testing Turboshaft and crankshaft motor/generator (M/G) have been tested on separate test rigs Measured peak efficiency of crankshaft M/G at target level ETC turbocharger is being tested on gas stand Rotor dynamics check Compressor map Turbine map Engine test planned for October 2004 Caterpillar Engine Research Diesel & Emissions Technology Agenda Program Objectives and ETC System Background Update on Component Developments Turbo-shaft generator and crankshaft motor Air handling system Control system Component testing Cost/Value Study Next Steps and Summary Caterpillar Engine Research Diesel & Emissions Technology Cost/Value Study Value of ETC Technology Program is based 3 to 5% bsfc reduction on MY 2000 engine No need for waste gate Enhanced braking power through Higher boost Regenerative braking with crank m/g Turbo assist capabilities Control A/F ratio (gas engines) Improved cold startability Altitude capability Caterpillar Engine Research Diesel & Emissions Technology System – Cost/Value: Example On-Highway Truck ETC system cost cost increment turbo M/G turboshaft ¾System cost: $ 2000 to $ 3400 M/G crankshaft ¾Powerelectronics account for half the cost powerelectronics Customer Benefit ¾ Payback period between 13 (best case) and 38 months Caterpillar Engine Research Diesel & Emissions Technology Next Steps for ETC Development • Complete test of ETC turbocharger in gas-stand lab-setting • Complete engine testing with ETC system • Assess ETC on low emission engine – Packaging – Aerodynamics – Cost effective design – Reliability/durability demonstration Caterpillar Engine Research Diesel & Emissions Technology Caterpillar Confidential & Proprietary Summary • Turbocharger and ETC system have been designed and analyzed • Performance predictions indicate 3 to 5% fuel economy improvement for cycle, 10% at key operating point • Opportunity for reduced emissions and improved drivability • E-Machine hardware testing completed • Cost/value analysis shows high customer value Caterpillar Engine Research Diesel & Emissions Technology.
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