Mild Hybrid Powertrain Concepts for Off-Highway Applications

Future powertrain concepts for Off-Highway applications must meet very challenging requirements. In addition to compliance with ever more stringent pollutant emission targets, customers expect favorable performance and reliability characteristics at low total cost of ownership. In this context, the application of hybrid technologies derived from the automotive sector offers new possibilities. The paper discusses future legal boundary conditions and analyses different hybrid powertrain concepts for typical Off-Highway applications based on a comprehensive simulation study. The focus of this study is on a mild hybrid system with a cost optimized below 56 kW internal combustion engine and a simplified exhaust aftertreatment system. This hybrid powerpack is evaluated for different Off-Highway applications based on standard EPA nonroad cycles.