Hybrid diesel electric powertrains and emissions testing thereof

摘要

Diesel electric hybrid powertrains and methods of operating and testing such powertrains are disclosed. Certain exemplary embodiments comprise test and certification methods in which a controller operates a diesel engine alone, an integrated motor/generator alone, or both the diesel engine and the motor/generator to provide brake torque at a common output shaft according to predetermined duty cycle criteria. Emissions are measured based upon criteria accounting for the effects of regenerative braking, engine shut off, and other operational modes unique to hybrid powertrains. Further exemplary embodiments comprise hybrid powertrain systems and methods of operating the same meeting performance and emissions requirements including respective limits on NOx, hydrocarbon, particulate matter, CO, and CO2 without reliance conventional emissions reduction devices or techniques.

主权项

1. A method of testing emissions of a diesel-electric hybrid powertrain, the method comprising:
providing a powertrain including a diesel engine, a motor/generator integrated with the engine to provide brake torque at a common output shaft, and an energy storage system configured to selectably receive electrical energy from the motor/generator and provide electrical energy to the motor/generator; directly coupling the output shaft to a dynamometer; operating the powertrain according to a predetermined schedule of operating criteria to provide brake torque at the output shaft using a combination of the engine operating alone, the motor/generator operating alone, and the engine operating with the motor/generator; and determining emissions of NOx, particulate matter, hydrocarbon, CO, and CO2 over the predetermined schedule of operating criteria; wherein during the operating a predetermined limit is imposed on operation of the powertrain to capture energy from the motor/generator operating alone.